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1

Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To  

Open Energy Info (EERE)

Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To Efficiently Exploit Enhanced Geothermal Systems Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To Efficiently Exploit Enhanced Geothermal Systems Project Type / Topic 1 Recovery Act: Enhanced Geothermal Systems Component Research and Development/Analysis Project Type / Topic 2 Drilling Systems Project Description This project proposes to develop a cost-effective microhole drilling and completion technology with the Flash Abrasive Slurry Jet (ASJ) system and optimize it to maximize the efficiency of fluid circulation and heat removal for Enhanced Geothermal Systems (EGS). The proposed approach is expected to address the key obstacles that currently prevent EGS from becoming a technically feasible, commercially viable major contributor for electricity generation, namely: (1) reduce costs for drilling and well completion and (2) increase the volume of hot rock from which heat can be extracted.

2

Abrasive slurry composition for machining boron carbide  

DOE Patents (OSTI)

An abrasive slurry particularly suited for use in drilling or machining boron carbide consists essentially of a suspension of boron carbide and/or silicon carbide grit in a carrier solution consisting essentially of a dilute solution of alkylaryl polyether alcohol in octyl alcohol. The alkylaryl polyether alcohol functions as a wetting agent which improves the capacity of the octyl alcohol for carrying the grit in suspension, yet without substantially increasing the viscosity of the carrier solution.

Duran, Edward L. (Santa Fe, NM)

1985-01-01T23:59:59.000Z

3

System for pressure letdown of abrasive slurries  

DOE Patents (OSTI)

A system and method for releasing erosive slurries from containment at high pressure without subjecting valves to highly erosive slurry flow. The system includes a pressure letdown tank disposed below the high-pressure tank, the two tanks being connected by a valved line communicating the gas phases and a line having a valve and choke for a transfer of liquid into the letdown tank. The letdown tank has a valved gas vent and a valved outlet line for release of liquid. In operation, the gas transfer line is opened to equalize pressure between tanks so that a low level of liquid flow occurs. The letdown tank is then vented, creating a high-pressure differential between the tanks. At this point, flow between tanks is controlled by the choke. High-velocity, erosive flow through a high-pressure outlet valve is prevented by equalizing the start up pressure and thereafter limiting flow with the choke.

Kasper, Stanley (Pittsburgh, PA)

1991-01-01T23:59:59.000Z

4

Testing of Alternative Abrasives for Water-Jet Cutting at C Tank Farm  

SciTech Connect

Legacy waste from defense-related activities at the Hanford Site has predominantly been stored in underground tanks, some of which have leaked; others may be at risk to do so. The U.S. Department of Energy’s goal is to empty the tanks and transform their contents into more stable waste forms. To do so requires breaking up, and creating a slurry from, solid wastes in the bottoms of the tanks. A technology developed for this purpose is the Mobile Arm Retrieval System. This system is being used at some of the older single shell tanks at C tank farm. As originally planned, access ports for the Mobile Arm Retrieval System were to be cut using a high- pressure water-jet cutter. However, water alone was found to be insufficient to allow effective cutting of the steel-reinforced tank lids, especially when cutting the steel reinforcing bar (“rebar”). The abrasive added in cutting the hole in Tank C-107 was garnet, a complex natural aluminosilicate. The hardness of garnet (Mohs hardness ranging from H 6.5 to 7.5) exceeds that of solids currently in the tanks, and was regarded to be a threat to Hanford Waste Treatment and Immobilization Plant systems. Olivine, an iron-magnesium silicate that is nearly as hard as garnet (H 6.5 to 7), has been proposed as an alternative to garnet. Pacific Northwest National Laboratory proposed to test pyrite (FeS2), whose hardness is slightly less (H 6 to 6.5) for 1) cutting effectiveness, and 2) propensity to dissolve (or disintegrate by chemical reaction) in chemical conditions similar to those of tank waste solutions. Cutting experiments were conducted using an air abrader system and a National Institute of Standards and Technology Standard Reference Material (SRM 1767 Low Alloy Steel), which was used as a surrogate for rebar. The cutting efficacy of pyrite was compared with that of garnet and olivine in identical size fractions. Garnet was found to be most effective in removing steel from the target; olivine and pyrite were less effective, but about equal to each other. The reactivity of pyrite, compared to olivine and garnet, was studied in high-pH, simulated tank waste solutions in a series of bench-top experiments. Variations in temperature, degree of agitation, grain size, exposure to air, and presence of nitrate and nitrite were also studied. Olivine and garnet showed no sign of dissolution or other reaction. Pyrite was shown to react with the fluids in even its coarsest variation (150?1000 ?m). Projected times to total dissolution for most experiments range from months to ca. 12 years, and the strongest control on reaction rate is the grain size.

Krogstad, Eirik J.

2013-08-01T23:59:59.000Z

5

Resuspension of non-Newtonian slurries by submerged jet-nozzles  

SciTech Connect

Experiments were conducted to determine the fluid velocity required for resuspension and removal of the radioactive waste sludge, which is characterized as a non-Newtonian fluid, from the tanks at the Savannah river site (SRS) (Georgia, USA) to accelerate the closure of the tanks with high level waste (HLW). Five different non-Newtonian fluids, which simulated the actual waste characteristics, were used to investigate the resuspension of the slurries with a jet-nozzle mixer. The laboratory tests were conducted at different flow rates and jet-nozzle orientations in a cylindrical tank with 0.3-m diameter and 0.46 m in height. Resuspension of the slurries was achieved by the submerged jets produced by two horizontal discharge nozzles located under the liquid level and positioned at 180 from each other. The fluids exhibited Bingham plastic behavior; therefore, the mixing power depends not only on the Reynolds number but also on the yield stress and high shear viscosity. A similarity analysis was performed to determine the effective cleaning radius (ECR) of the jet. The mixing efficiency was evaluated by visual analysis of the images during the experiments conducted at three nozzle orientations at 0 , 45 , and 90 and two nozzle exit velocities of 2.33 m/s and 0.56 m/s. The centerline velocity decayed with the distance from the jet-nozzle. The experimental results were compared with other mixing models. (author)

Reshma, Reshma [Applied Research Center, Florida International University, Miami, FL 33174 (United States); Civil and Environmental Engineering Department, Florida International University, Engineering Center 3676, Miami, FL 33174 (United States); Daas, Mutaz; Srivastava, Rajiv [Applied Research Center, Florida International University, Miami, FL 33174 (United States); Tansel, Berrin [Civil and Environmental Engineering Department, Florida International University, Engineering Center 3676, Miami, FL 33174 (United States)

2007-07-15T23:59:59.000Z

6

Measurements on 5:1 Scale Abrasive Water Jet Cutting Head Models  

E-Print Network (OSTI)

nozzle orifice s Isentropic (e.g. in w.jet.s) w.jet Water jet water Water Superscripts: * Symbol for non, an achievable accuracy also mentioned by Hashish in [7]. Improving the AWJ cutting process in a way that parts with precise accuracy of motion, a precisely manufactured tool (cutting head) and optimally set machining

7

9 - Abrasives and abrasive tools  

Science Journals Connector (OSTI)

Materials used as abrasives include both natural minerals and synthetic products. Abrasive grains can be considered as randomly shaped cutting tools characterized by high hardness, sharp edges, and good cutting ability. This chapter discusses the nature of common abrasives and machining characteristics. Standard methods of specifying abrasive wheels are described. Conventional abrasives are described including silicon carbide, aluminium oxide, and garnet. Two superabrasives described include diamond and cubic boron nitride. Abrasives and new abrasive grain developments are discussed in some detail including grains produced by sol gel and related processes. The requirements of an abrasive are discussed in relation to application. Various selection criteria apply depending on workpiece material, work geometry, grinding fluid and removal conditions. The structure of abrasives is discussed and the nature of abrasive tools including types of wheel bonds. Bonded structures include vitrified bonds, organic bonds, and for super-abrasives single layer bonds and metal bonds. Essential calculations methods are provided for the design of grinding wheels. Coated abrasives and abrasive belts are also discussed. References are provided to previous work including a range of abrasive manufacturers.

Ioan D. Marinescu; W. Brian Rowe; Boris Dimitrov; Hitoshi Ohmori

2013-01-01T23:59:59.000Z

8

Scaling Laws for Reduced-Scale Tests of Pulse Jet Mixing Systems in Non-Newtonian Slurries: Mixing Cavern Behavior  

SciTech Connect

The Waste Treatment Plant (WTP) under construction at the Hanford Site will use pulse jet mixer (PJM) technology for mixing and gas retention control applications in tanks expected to contain waste slurries exhibiting a non-Newtonian rheology. This paper presents the results of theoretical and experimental studies undertaken to establish a methodology to perform reduced-scale mixing tests with PJM systems in non-Newtonian fluids. A theoretical model for mixing cavern formation from steady and pulsed jets is developed and compared with data from a single unsteady jet in a yield stress simulant. Dimensional analysis is used to identify the important dimensionless parameters affecting mixing performance in more complex systems. Scaling laws are proposed based on the modeling and dimensional analysis. Experimental validation of the scaling laws governing unsteady jet mixing in non-Newtonian fluids are also presented. Tests were conducted at three scales using two non-Newtonian simulants. The data were compared non-dimensionally, and the important scale laws were confirmed. The key dimensionless parameters were found to be the Strouhal number (which describes unsteady pulse jet mixer operation), the yield Reynolds number (which governs cavern formation due to non-Newtonian fluid behavior), and the viscous Reynolds number (which determines the flow regime and the degree of turbulence). The experimentally validated scaling laws provide the basis for reduced scale testing of prototypic WTP mixing systems. It is argued that mixing systems developed from reduced scale testing will produce conservative designs at full scale.

Meyer, Perry A.; Kurath, Dean E.; Bamberger, Judith A.; Barnes, Steven M.; Etchells, Arthur W.

2006-03-02T23:59:59.000Z

9

An Approach to Understanding Cohesive Slurry Settling, Mobilization, and Hydrogen Gas Retention in Pulsed Jet Mixed Vessels  

SciTech Connect

The Hanford Waste Treatment and Immobilization Plant (WTP) is being designed and built to pretreat and vitrify a large portion of the waste in Hanford’s 177 underground waste storage tanks. Numerous process vessels will hold waste at various stages in the WTP. Some of these vessels have mixing-system requirements to maintain conditions where the accumulation of hydrogen gas stays below acceptable limits, and the mixing within the vessels is sufficient to release hydrogen gas under normal conditions and during off-normal events. Some of the WTP process streams are slurries of solid particles suspended in Newtonian fluids that behave as non-Newtonian slurries, such as Bingham yield-stress fluids. When these slurries are contained in the process vessels, the particles can settle and become progressively more concentrated toward the bottom of the vessels, depending on the effectiveness of the mixing system. One limiting behavior is a settled layer beneath a particle-free liquid layer. The settled layer, or any region with sufficiently high solids concentration, will exhibit non-Newtonian rheology where it is possible for the settled slurry to behave as a soft solid with a yield stress. In this report, these slurries are described as settling cohesive slurries.

Gauglitz, Phillip A.; Wells, Beric E.; Fort, James A.; Meyer, Perry A.

2009-05-22T23:59:59.000Z

10

Slurry 7  

NLE Websites -- All DOE Office Websites (Extended Search)

Introduction to Introduction to Slurry Injection Technology for Disposal of Drilling Wastes Because wastes are injected deep into the earth below drinking water zones, proper slurry injection opera- tions should pose lower environmental and health risks than more conventional surface disposal methods. Table of Contents What Are Drilling Wastes? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 How Are Drilling Wastes Managed? . . . . . . . . . . . . . . . . . . . . . .3 Underground Injection of Drilling Wastes . . . . . . . . . . . . . . . . .4 Disposal in Salt Caverns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Subfracture Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Types of Slurry Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

11

Erosion resistance of continuously reinforced SiC–Ti-based metal matrix composites by a SiC/water slurry jet  

Science Journals Connector (OSTI)

The erosion of a continuously reinforced SiC (Sigma 1140 plus)/Ti–6Al–4V composite was investigated with a SiC/water slurry jet at various angles on a plane perpendicular to the direction of the reinforcement. The results demonstrate the combination of both ceramic and metallic properties. Both the low-angle erosion resistance of ceramics as well as the high-angle resistance of a metallic alloy lead to an overall reduction in erosion rate at the various angles. Ti/SiC composite shows the best erosive wear resistance indicating that the combination effect between ductile Ti-based matrix and high strength SiC fibre for continuously fibre-reinforced Ti-based metal matrix composites (MMCs) plays a key role in increasing the erosive resistance. To gain a better understanding of the combination and synergistic enhancement of erosion resistance for two components in SiC/Ti composite materials, a shadowing effect and effect of reducing impact energy on SiC fibre during erosion are discussed. A simple theoretical model based on experimental data and a modified inverse rule-of-mixtures averaging law of erosion resistance for SiC fibre-reinforced \\{MMCs\\} are discussed.

Q Fang; P.S Sidky; G.M Hocking

1999-01-01T23:59:59.000Z

12

Effects of mineral fillers in slurry seal mixtures  

E-Print Network (OSTI)

. 48 2. 12 2. 19 2. 22 2. 23 1. 46 2. 12 2. 21 2. 25 2. 26 36. 8 9. 4 6. 4 5. 1 4. 7 37. 6 8. 6 5. 6 3. 8 3. 4 egased on computed maximum theoretical specific gravity ~ 2. 34 After compaction the specimens were measured for density... 1 Young Wet Track Abrasion Device. Page . 18 2 Aggregate Gradation. . 3 Mineral Piller Gradation. . 26 . 28 4 Sketch of Typical Specimen. . 5 Slurry Seal Test Specimen - Excellent 6 Slurry Seal Test Specimen - Unsatisfactory. . 7 Slurry...

Harper, William Joe

2012-06-07T23:59:59.000Z

13

Jet Jet Jet Jet  

NLE Websites -- All DOE Office Websites (Extended Search)

protons protons top quark bottom quark muon top quark antiprotons bottom quark low energy muon quark quark - W boson + Jet Jet Jet Jet neutrino W boson particles antiparticles A Top Antitop Quark Event from the D-Zero Detector at Fermilab muon low energy muon Jet Jet Jet Jet particles antiparticles Particles Seen by the D-Zero Detector at Fermilab in a Top Antitop Quark Event. DST LEGO 16-JUL-1996 15:32 Run 92704 Event 14022 9-JUL-1995 13:17 MUON MUON Miss ET ET DST ETA-PHI 4 MUON 1 MISS ET 4 JET (HAD) (EM) D-Zero Detector at Fermi National Accelerator Laboratory Lego Plot CAL+TKS END VIEW 16-JUL-1996 15:33 Run 92704 Event 14022 9-JUL-1995 13:17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14

Aqueous coal slurry  

DOE Patents (OSTI)

An aqueous slurry containing coal and dextrin as a dispersant. The slurry, in addition to containing dextrin, may contain a conventional dispersant or, alternatively, a pH controlling reagent.

Berggren, Mark H. (Golden, CO); Smit, Francis J. (Arvada, CO); Swanson, Wilbur W. (Golden, CO)

1993-01-01T23:59:59.000Z

15

Abrasion resistant composition  

DOE Patents (OSTI)

A surface covering composition of abrasion resistant character adapted for disposition in overlying bonded relation to a metal substrate. The surface covering composition includes metal carbide particles within a metal matrix at a packing factor of not less than about 0.6. Not less than about 40 percent by weight of the metal carbide particles are characterized by an effective diameter in the range of +14-32 mesh prior to introduction to the metal matrix. Not less than about 3 percent by weight of the metal carbide particles are characterized by an effective diameter of +60 mesh prior to introduction to the metal matrix.

Fischer, Keith D; Barnes, Christopher A; Henderson, Stephen L

2014-05-13T23:59:59.000Z

16

High Performance Abrasion-Resistant Materials: Lessons from Nature  

E-Print Network (OSTI)

Basics of abrasion resistance materials The progressive lossachieve abrasion resistance, materials need to posses highresistance materials

Wang, Qianqian

2012-01-01T23:59:59.000Z

17

Ultrasound Analysis of Slurries  

DOE Patents (OSTI)

An autoclave reactor allows for the ultrasonic analysis of slurry concentration and particle size distribution at elevated temperatures and pressures while maintaining the temperature- and pressure-sensitive ultrasonic transducers under ambient conditions. The reactor vessel is a hollow stainless steel cylinder containing the slurry which includes a stirrer and a N, gas source for directing gas bubbles through the slurry. Input and output transducers are connected to opposed lateral portions of the hollow cylinder for respectively directing sound waves through the slurry and receiving these sound waves after transmission through the slurry, where changes in sound wave velocity and amplitude can be used to measure slurry parameters. Ultrasonic adapters connect the transducers to the reactor vessel in a sealed manner and isolate the transducers from the hostile conditions within the vessel without ultrasonic signal distortion or losses.

Soong, Yee and Blackwell, Arthur G.

2005-11-01T23:59:59.000Z

18

Slurry parameters effect on Chemicalâ??Mechanical Planarisation (CMP) of deposited silver (Ag) on chips  

Science Journals Connector (OSTI)

Ag-deposited chips composed of electrodes, which are spaced apart by photoresist, are polished by Chemical-Mechanical Planarisation (CMP). We optimise the polishing process parameters including processing pressure, rotating speed, slurry supplying rate, etc., and examine the effect of some slurry parameters such as abrasives, oxidisers, corrosives, complexing agents and surfactants and get optimum Ag CMP slurry with high Material Removal Rate (MRR) and low average roughness (Ra). Low vertical distance between Ag and photoresist is obtained by optimising metal Ag MRR and controlling polishing end-point exactly. CMP mechanism and relationship between surface defects and additives structures are elementary discussed too.

Y.J. Dai; G.S. Pan; H.F. Pei; J.Z. Sun; Y. Liu; H. Du

2010-01-01T23:59:59.000Z

19

Ultrasound Analysis of Slurries  

NLE Websites -- All DOE Office Websites (Extended Search)

Ultrasound Analysis of Slurries Ultrasound Analysis of Slurries Opportunity The Department of Energy's National Energy Technology Laboratory is seeking licensing partners interested in implementing United States Patent Number 6,959,589 entitled "Ultrasound Analysis of Slurries." Disclosed in this patent is an apparatus that facilitates the ultrasonic analysis of materials in slurry form. The apparatus focuses on an autoclave arrange- ment to determine the concentration and/or particle size distribution of the slurry under elevated temperature and pressure conditions. During the process, the temperature- and pressure-sensitive ultrasonic transducers are maintained under ambient conditions. The transducers are positioned outside of the temperature-pressure environment of the material to be analyzed,

20

Ceramic-bonded abrasive grinding tools  

DOE Patents (OSTI)

Abrasive grains such as boron carbide, silicon carbide, alumina, diamond, cubic boron nitride, and mullite are combined with a cement primarily comprised of zinc oxide and a reactive liquid setting agent and solidified into abrasive grinding tools. Such grinding tools are particularly suitable for grinding and polishing stone, such as marble and granite.

Holcombe, Jr., Cressie E. (Farragut, TN); Gorin, Andrew H. (Knoxville, TN); Seals, Roland D. (Oak Ridge, TN)

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Medical ice slurry production device  

DOE Patents (OSTI)

The present invention relates to an apparatus for producing sterile ice slurries for medical cooling applications. The apparatus is capable of producing highly loaded slurries suitable for delivery to targeted internal organs of a patient, such as the brain, heart, lungs, stomach, kidneys, pancreas, and others, through medical size diameter tubing. The ice slurry production apparatus includes a slurry production reservoir adapted to contain a volume of a saline solution. A flexible membrane crystallization surface is provided within the slurry production reservoir. The crystallization surface is chilled to a temperature below a freezing point of the saline solution within the reservoir such that ice particles form on the crystallization surface. A deflector in the form of a reciprocating member is provided for periodically distorting the crystallization surface and dislodging the ice particles which form on the crystallization surface. Using reservoir mixing the slurry is conditioned for easy pumping directly out of the production reservoir via medical tubing or delivery through other means such as squeeze bottles, squeeze bags, hypodermic syringes, manual hand delivery, and the like.

Kasza, Kenneth E. (Palos Park, IL); Oras, John (Des Plaines, IL); Son, HyunJin (Naperville, IL)

2008-06-24T23:59:59.000Z

22

Experimental Testing of an Electrical Submersible Pump Undergoing Abrasive Slurry Erosion  

E-Print Network (OSTI)

change with erosion time ................................................................... 59 45. Tungsten carbide journal bearings after 117 hours .................................................. 60 46. Bearings 20-i and 21-j base condition... sleeves condition after 117 hours of erosion ................................................ 67 57. Bearing number and location ................................................................................... 68 58. ESP tungsten carbide bearing...

Saleh, Ramy Moaness M

2013-04-01T23:59:59.000Z

23

Coal-oil slurry preparation  

DOE Patents (OSTI)

A pumpable slurry of pulverized coal in a coal-derived hydrocarbon oil carrier which slurry is useful as a low-ash, low-sulfur clean fuel, is produced from a high sulfur-containing coal. The initial pulverized coal is separated by gravity differentiation into (1) a high density refuse fraction containing the major portion of non-coal mineral products and sulfur, (2) a lowest density fraction of low sulfur content and (3) a middlings fraction of intermediate sulfur and ash content. The refuse fraction (1) is gasified by partial combustion producing a crude gas product from which a hydrogen stream is separated for use in hydrogenative liquefaction of the middlings fraction (3). The lowest density fraction (2) is mixed with the liquefied coal product to provide the desired fuel slurry. Preferably there is also separately recovered from the coal liquefaction LPG and pipeline gas.

Tao, John C. (Perkiomenville, PA)

1983-01-01T23:59:59.000Z

24

SciTech Connect: Abrasion and erosion testing of materials used...  

Office of Scientific and Technical Information (OSTI)

POWER PLANTS; ABRASION; ABRASIVES; ALLOYS; COAL; COMBUSTION; ELECTRIC FURNACES; GASES; HEAT TREATMENTS; IMPACT TESTS; IMPINGEMENT; IMPURITIES; POWER GENERATION; POWER PLANTS;...

25

Supersonic coal water slurry fuel atomizer  

DOE Patents (OSTI)

A supersonic coal water slurry atomizer utilizing supersonic gas velocities to atomize coal water slurry is provided wherein atomization occurs externally of the atomizer. The atomizer has a central tube defining a coal water slurry passageway surrounded by an annular sleeve defining an annular passageway for gas. A converging/diverging section is provided for accelerating gas in the annular passageway to supersonic velocities.

Becker, Frederick E. (Reading, MA); Smolensky, Leo A. (Concord, MA); Balsavich, John (Foxborough, MA)

1991-01-01T23:59:59.000Z

26

A nonmineralized approach to abrasion-resistant biomaterials  

E-Print Network (OSTI)

of biostructural materials. In this study, the abrasion resistance of the jaws of one such animal, the bloodworm, stiffest, and most abrasion-resistant materials are found within a thin (A nonmineralized approach to abrasion- resistant biomaterials Michael G. Pontin*, Dana N. Moses , J

Zok, Frank

27

Coal-CO[subscript 2] Slurry Feed for Pressurized Gasifiers: Slurry Preparation System Characterization and Economics  

E-Print Network (OSTI)

Gasification-based plants with coal-CO[subscript 2] slurry feed are predicted to be more efficient than those with coal-water slurry feed. This is particularly true for high moisture, low rank coal such as lignite. ...

Botero, Cristina

28

Cryogenic slurry for extinguishing underground fires  

DOE Patents (OSTI)

A cryogenic slurry comprising a mixture of solid carbon dioxide particles suspended in liquid nitrogen is provided which is useful in extinguishing underground fires.

Chaiken, Robert F. (Pittsburgh, PA); Kim, Ann G. (Pittsburgh, PA); Kociban, Andrew M. (Wheeling, WV); Slivon, Jr., Joseph P. (Tarentum, PA)

1994-01-01T23:59:59.000Z

29

E-Print Network 3.0 - abrasive wear model Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

refers to concrete wear through the action of flowing water 5, 6. The potential for hydro-abrasive... wear and abrasion tests. Abrasion is defined as the wear of concrete...

30

E-Print Network 3.0 - abrasive wear characteristics Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

refers to concrete wear through the action of flowing water 5, 6. The potential for hydro-abrasive... wear and abrasion tests. Abrasion is defined as the wear of concrete...

31

Optimizing slurry separation in coal preparation  

SciTech Connect

In processing slurry with cationic polyelectrolytes, the final concentration of the suspended particulates in the water beyond the slurry tank in the coal-preparation shop is no more than 10 mg/l. Consequently, this water may be reused in industrial systems.

V.S. Shved; V.H. Fritsler; V.V. Bukhtiyarov [OAO Koks, Kemerovo (Russian Federation)

2009-05-15T23:59:59.000Z

32

E-Print Network 3.0 - abrasive wear study Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

severe abrasion under the wheels of the HWTD. Therefore, a research project... soundness, Micro-Deval loss, L.A. abrasion, British Pendulum ... Source: Texas at Austin, University...

33

Process for heating coal-oil slurries  

DOE Patents (OSTI)

Controlling gas to slurry volume ratio to achieve a gas holdup of about 0.4 when heating a flowing coal-oil slurry and a hydrogen containing gas stream allows operation with virtually any coal to solvent ratio and permits operation with efficient heat transfer and satisfactory pressure drops. The critical minimum gas flow rate for any given coal-oil slurry will depend on numerous factors such as coal concentration, coal particle size distribution, composition of the solvent (including recycle slurries), and type of coal. Further system efficiency can be achieved by operating with multiple heating zones to provide a high heat flux when the apparent viscosity of the gas saturated slurry is highest. Operation with gas flow rates below the critical minimum results in system instability indicated by temperature excursions in the fluid and at the tube wall, by a rapid increase and then decrease in overall pressure drop with decreasing gas flow rate, and by increased temperature differences between the temperature of the bulk fluid and the tube wall. At the temperatures and pressures used in coal liquefaction preheaters the coal-oil slurry and hydrogen containing gas stream behaves essentially as a Newtonian fluid at shear rates in excess of 150 sec[sup [minus]1]. The gas to slurry volume ratio should also be controlled to assure that the flow regime does not shift from homogeneous flow to non-homogeneous flow. Stable operations have been observed with a maximum gas holdup as high as 0.72. 29 figs.

Braunlin, W.A.; Gorski, A.; Jaehnig, L.J.; Moskal, C.J.; Naylor, J.D.; Parimi, K.; Ward, J.V.

1984-01-03T23:59:59.000Z

34

Process for heating coal-oil slurries  

DOE Patents (OSTI)

Controlling gas to slurry volume ratio to achieve a gas holdup of about 0.4 when heating a flowing coal-oil slurry and a hydrogen containing gas stream allows operation with virtually any coal to solvent ratio and permits operation with efficient heat transfer and satisfactory pressure drops. The critical minimum gas flow rate for any given coal-oil slurry will depend on numerous factors such as coal concentration, coal particle size distribution, composition of the solvent (including recycle slurries), and type of coal. Further system efficiency can be achieved by operating with multiple heating zones to provide a high heat flux when the apparent viscosity of the gas saturated slurry is highest. Operation with gas flow rates below the critical minimum results in system instability indicated by temperature excursions in the fluid and at the tube wall, by a rapid increase and then decrease in overall pressure drop with decreasing gas flow rate, and by increased temperature differences between the temperature of the bulk fluid and the tube wall. At the temperatures and pressures used in coal liquefaction preheaters the coal-oil slurry and hydrogen containing gas stream behaves essentially as a Newtonian fluid at shear rates in excess of 150 sec.sup. -1. The gas to slurry volume ratio should also be controlled to assure that the flow regime does not shift from homogeneous flow to non-homogeneous flow. Stable operations have been observed with a maximum gas holdup as high as 0.72.

Braunlin, Walter A. (Spring, TX); Gorski, Alan (Lovington, NM); Jaehnig, Leo J. (New Orleans, LA); Moskal, Clifford J. (Oklahoma City, OK); Naylor, Joseph D. (Houston, TX); Parimi, Krishnia (Allison Park, PA); Ward, John V. (Arvada, CO)

1984-01-03T23:59:59.000Z

35

Drilling Waste Management Fact Sheet: Slurry Injection of Drilling Wastes  

NLE Websites -- All DOE Office Websites (Extended Search)

Slurry Injection Slurry Injection Fact Sheet - Slurry Injection of Drilling Wastes Underground Injection of Drilling Wastes Several different approaches are used for injecting drilling wastes into underground formations for permanent disposal. Salt caverns are described in a separate fact sheet. This fact sheet focuses on slurry injection technology, which involves grinding or processing solids into small particles, mixing them with water or some other liquid to make a slurry, and injecting the slurry into an underground formation at pressures high enough to fracture the rock. The process referred to here as slurry injection has been given other designations by different authors, including slurry fracture injection (this descriptive term is copyrighted by a company that provides slurry injection services), fracture slurry injection, drilled cuttings injection, cuttings reinjection, and grind and inject.

36

Coal fuel slurry for internal combustion engines  

Science Journals Connector (OSTI)

A technoeconomic study of the production of coal-water fuel slurry for internal combustion engines and thermal power plants was performed. Based on the accumulated experimental data, it was found that, in the ...

N. I. Red’kina; G. S. Khodakov; E. G. Gorlov

2013-09-01T23:59:59.000Z

37

Effect of metallic aggregate and cement content on abrasion resistance behaviour of  

E-Print Network (OSTI)

objects during service. The abrasive resistance of con- struction materials, including mortar and concreteEffect of metallic aggregate and cement content on abrasion resistance behaviour of concrete O abrasion resistance, such as dams, canals, roads and floors. The abrasion resistance of concrete may

North Texas, University of

38

AN INVESTIGATION OF TWO-BODY ABRASIVE WEAR  

E-Print Network (OSTI)

the abrasive wear resistance of a material by its mechanicalin the wear resistance of certain types of materials. Three-wear resistance than do changes in the underaged material.

Hirano, Howard H.

2011-01-01T23:59:59.000Z

39

Method of protecting surfaces from abrasion and abrasion resistant articles of manufacture  

DOE Patents (OSTI)

Surfaces of fabricated structures are protected from damage by impacting particulates by a coating of hard material formed as a mass of thin flexible filaments having root ends secured to the surface and free portions which can flex and overlap to form a resilient cushioning mat which resembles hair or fur. The filamentary coating covers the underlying surface with hard abrasion resistance material while also being compliant and capable of local accommodation to particle impacts. The coating can also function as thermal and/or acoustical insulation and has a friction reducing effect. 11 figs.

Hirschfeld, T.B.

1988-06-09T23:59:59.000Z

40

Hydraulic fracturing slurry transport in horizontal pipes  

SciTech Connect

Horizontal-well activity has increased throughout the industry in the past few years. To design a successful hydraulic fracturing treatment for horizontal wells, accurate information on the transport properties of slurry in horizontal pipe is required. Limited information exists that can be used to estimate critical deposition and resuspension velocities when proppants are transported in horizontal wells with non-Newtonian fracturing gels. This paper presents a study of transport properties of various hydraulic fracturing slurries in horizontal pipes. Flow data are gathered in three transparent horizontal pipes with different diameters. Linear and crosslinked fracturing gels were studied, and the effects of variables--e.g., pipe size; polymer-gelling-agent concentration; fluid rheological properties; crosslinking effects; proppant size, density, and concentrations; fluid density; and slurry pump rate--on critical deposition and resuspension velocities were investigated. Also, equations to estimate the critical deposition and resuspension velocities of fracturing gels are provided.

Shah, S.N.; Lord, D.L. (Halliburton Services (US))

1990-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

EXPERIMENTAL MEASUREMENT OF ACCELERATED EROSION IN A SLURRY POT TESTER  

E-Print Network (OSTI)

Control Achieved on Coal Slurry Pipeline," MaterialsReduces Corrosion in a Coal-Water Slurry Pipel'ines, 11 pp.Diameter (].lm) PARTICLES Coal L5 SiC METALS (2) Average

Tsai, W.

2012-01-01T23:59:59.000Z

42

Air blast type coal slurry fuel injector  

DOE Patents (OSTI)

A device to atomize and inject a coal slurry in the combustion chamber of an internal combustion engine, and which eliminates the use of a conventional fuel injection pump/nozzle. The injector involves the use of compressed air to atomize and inject the coal slurry and like fuels. In one embodiment, the breaking and atomization of the fuel is achieved with the help of perforated discs and compressed air. In another embodiment, a cone shaped aspirator is used to achieve the breaking and atomization of the fuel. The compressed air protects critical bearing areas of the injector.

Phatak, Ramkrishna G. (San Antonio, TX)

1986-01-01T23:59:59.000Z

43

ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR) TECHNOLOGY  

SciTech Connect

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large-diameter reactors. Washington University's work during the reporting period involved the implementation of the automated calibration device, which will provide an advanced method of determining liquid and slurry velocities at high pressures. This new calibration device is intended to replace the original calibration setup, which depended on fishing lines and hooks to position the radioactive particle. The report submitted by Washington University contains a complete description of the new calibration device and its operation. Improvements to the calibration program are also discussed. Iowa State University utilized air-water bubble column simulations in an effort to determine the domain size needed to represent all of the flow scales in a gas-liquid column at a high superficial velocity. Ohio State's report summarizes conclusions drawn from the completion of gas injection phenomena studies, specifically with respect to the characteristics of bubbling-jetting at submerged single orifices in liquid-solid suspensions.

Bernard A. Toseland

2000-12-31T23:59:59.000Z

44

Life Cycle Assessment of Biogas from Separated slurry  

E-Print Network (OSTI)

Life Cycle Assessment of Biogas from Separated slurry Lorie Hamelin, Marianne Wesnæs and Henrik AND ALTERNATIVES 28 2.2.1 Reference Scenario (Scenario A) 28 2.2.2 Biogas from raw pig slurry and fibre fraction from chemical- mechanical separation (Scenario F) 29 2.2.3 Biogas from raw cow slurry and fibre

45

Coal slurry combustion and technology. Volume 2  

SciTech Connect

Volume II contains papers presented at the following sessions of the Coal Slurry Combustion and Technology Symposium: (1) bench-scale testing; (2) pilot testing; (3) combustion; and (4) rheology and characterization. Thirty-three papers have been processed for inclusion in the Energy Data Base. (ATT)

Not Available

1983-01-01T23:59:59.000Z

46

The material and energy flow through the abrasive waterjet machining and recycling processes  

E-Print Network (OSTI)

The purpose of this thesis was to investigate the material and energy flow through the abrasive waterjet machine and the WARD recycling machine. The goal was to track all of the material, water, abrasive, energy, air, and ...

Kurd, Michael Omar, 1982-

2004-01-01T23:59:59.000Z

47

E-Print Network 3.0 - abrasive wear response Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Page: << < 1 2 3 4 5 > >> 1 Abrasive Wear Behavior of Heat-Treated ABC-Silicon Carbide Xiao Feng Zhang,*, Summary: Abrasive Wear Behavior of Heat-Treated ABC-Silicon...

48

E-Print Network 3.0 - abrasive wear behaviour Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Page: << < 1 2 3 4 5 > >> 1 Abrasive Wear Behavior of Heat-Treated ABC-Silicon Carbide Xiao Feng Zhang,*, Summary: Abrasive Wear Behavior of Heat-Treated ABC-Silicon...

49

Safety First Safety AlwaysSafety Last Using abrasive wheel equipment exposes you to many  

E-Print Network (OSTI)

Safety First Safety AlwaysSafety Last Using abrasive wheel equipment exposes you to many potential and strength and meet all manufacturer specifications. Abrasive Wheel Machinery and Tools Safety Tip #1

Minnesota, University of

50

Jet Observables Without Jet Algorithms  

E-Print Network (OSTI)

We introduce a new class of event shapes to characterize the jet-like structure of an event. Like traditional event shapes, our observables are infrared/collinear safe and involve a sum over all hadrons in an event, but like a jet clustering algorithm, they incorporate a jet radius parameter and a transverse momentum cut. Three of the ubiquitous jet-based observables---jet multiplicity, summed scalar transverse momentum, and missing transverse momentum---have event shape counterparts that are closely correlated with their jet-based cousins. Due to their "local" computational structure, these jet-like event shapes could potentially be used for trigger-level event selection at the LHC. Intriguingly, the jet multiplicity event shape typically takes on non-integer values, highlighting the inherent ambiguity in defining jets. By inverting jet multiplicity, we show how to characterize the transverse momentum of the n-th hardest jet without actually finding the constituents of that jet. Since many physics applications do require knowledge about the jet constituents, we also build a hybrid event shape that incorporates (local) jet clustering information. As a straightforward application of our general technique, we derive an event-shape version of jet trimming, allowing event-wide jet grooming without explicit jet identification. Finally, we briefly mention possible applications of our method for jet substructure studies.

Daniele Bertolini; Tucker Chan; Jesse Thaler

2013-10-28T23:59:59.000Z

51

Abrasive capacity of ߒ-sialons synthesized by hot pressing  

Science Journals Connector (OSTI)

The abrasive capacity of ߒ-sialons synthesized by hot pressing of a mixture of powder Si3N4 AI2O3, and A1N is studied as a function of the microstructure and the chemical and phase compositions.

G. P. Shveikin; 1 Yu. A. Smol’nikov…

52

Concentration Distributions during Pulse Jet Mixing  

SciTech Connect

Obtaining real-time, in situ slurry concentration measurements during unsteady mixing can provide increased understanding into mixer performance. During recent tests an ultrasonic attenuation sensor was inserted into a mixing vessel to measure the slurry concentration during unsteady mixing in real time during pulse jet mixer operation. These pulse jet mixing tests to suspend noncohesive solids in Newtonian liquid were conducted at three geometric scales. To understand the solids suspension process and resulting solids distribution, the concentration of solids in the cloud was measured at various elevations and radial positions during the pulse jet mixer cycle. In the largest scale vessel, concentration profiles were measured at three radial locations: r = 0, 0.5 and 0.9 R where R is the vessel radius. These radial concentration data are being analyzed to provide a model for predicting concentration as a function of elevation. This paper describes pulse jet mixer operation, provides a description of the concentration probe, and presents transient concentration data obtained at three radial positions: in the vessel center (O R), midway between the center and the wall (0.5 R) and near the vessel wall (0.9 R) through out the pulse to provide insight into pulse jet mixer performance.

Bamberger, Judith A.; Meyer, Perry A.

2010-08-05T23:59:59.000Z

53

Survey of state water laws affecting coal slurry pipeline development  

SciTech Connect

This report summarizes state water laws likely to affect the development of coal slurry pipelines. It was prepared as part of a project to analyze environmental issues related to energy transportation systems. Coal slurry pipelines have been proposed as a means to expand the existing transportation system to handle the increasing coal shipments that will be required in the future. The availability of water for use in coal slurry systems in the coal-producing states is an issue of major concern.

Rogozen, M.B.

1980-11-01T23:59:59.000Z

54

Erosive–corrosive wear of aluminum alloy composites: Influence of slurry composition and speed  

Science Journals Connector (OSTI)

The Erosion–corrosion behavior of a SiC particle reinforced Al–Si alloy has been studied in two different environments, namely saline and acidic, to simulate sea water and mining atmospheres, respectively. These studies were performed at different sand concentrations (20–40 wt%) and varying rotational speeds (700–900 rpm). It is noted from the present study that the composite exhibited better wear resistance than the alloy in marine and acidic atmospheres irrespective of sand content and speed. It is also noted that the wear rates increased with increasing sand content and speed irrespective of material due to increase in the severity of erosive/abrasive attacks. However, the wear rates decreased at higher speeds (e.g., 1100 rpm) due to increased intercollisions and rebounding and also the decrease in the mobility of the erodant particles. It is observed that erosion is the dominant mode of material removal in these two media. Corrosive attack was more predominant in the acidic media than in the NaCl media at lower sand concentrations (0–20 wt%). However, at higher sand concentrations (30–40 wt%) corrosive attack was more severe in the NaCl medium. Scanning electron microscopic (SEM) observation shows that Al/Si interfaces act as predominant sites for corrosion attack rather than the Al/SiC interfaces. Formation and removal of the passive layer, preferential attack at the Al/Si interfaces, fragmentation and wear of SiC particles were observed as mechanisms of material removal in marine and acidic media. SEM studies of the eroded–corroded surfaces indicated that an increase in the sand content of the slurry and in the rotational speed of the slurry increased resulted in greater damage to the SiC particles and matrix, resulting in an increase in wear rates.

S. Das; Y.L. Saraswathi; D.P. Mondal

2006-01-01T23:59:59.000Z

55

Chemical Hydride Slurry for Hydrogen Production and Storage  

SciTech Connect

The purpose of this project was to investigate and evaluate the attractiveness of using a magnesium chemical hydride slurry as a hydrogen storage, delivery, and production medium for automobiles. To fully evaluate the potential for magnesium hydride slurry to act as a carrier of hydrogen, potential slurry compositions, potential hydrogen release techniques, and the processes (and their costs) that will be used to recycle the byproducts back to a high hydrogen content slurry were evaluated. A 75% MgH2 slurry was demonstrated, which was just short of the 76% goal. This slurry is pumpable and storable for months at a time at room temperature and pressure conditions and it has the consistency of paint. Two techniques were demonstrated for reacting the slurry with water to release hydrogen. The first technique was a continuous mixing process that was tested for several hours at a time and demonstrated operation without external heat addition. Further work will be required to reduce this design to a reliable, robust system. The second technique was a semi-continuous process. It was demonstrated on a 2 kWh scale. This system operated continuously and reliably for hours at a time, including starts and stops. This process could be readily reduced to practice for commercial applications. The processes and costs associated with recycling the byproducts of the water/slurry reaction were also evaluated. This included recovering and recycling the oils of the slurry, reforming the magnesium hydroxide and magnesium oxide byproduct to magnesium metal, hydriding the magnesium metal with hydrogen to form magnesium hydride, and preparing the slurry. We found that the SOM process, under development by Boston University, offers the lowest cost alternative for producing and recycling the slurry. Using the H2A framework, a total cost of production, delivery, and distribution of $4.50/kg of hydrogen delivered or $4.50/gge was determined. Experiments performed at Boston University have demonstrated the technical viability of the process and have provided data for the cost analyses that have been performed. We also concluded that a carbothermic process could also produce magnesium at acceptable costs. The use of slurry as a medium to carry chemical hydrides has been shown during this project to offer significant advantages for storing, delivering, and distributing hydrogen: • Magnesium hydride slurry is stable for months and pumpable. • The oils of the slurry minimize the contact of oxygen and moisture in the air with the metal hydride in the slurry. Thus reactive chemicals, such as lithium hydride, can be handled safely in the air when encased in the oils of the slurry. • Though magnesium hydride offers an additional safety feature of not reacting readily with water at room temperatures, it does react readily with water at temperatures above the boiling point of water. Thus when hydrogen is needed, the slurry and water are heated until the reaction begins, then the reaction energy provides heat for more slurry and water to be heated. • The reaction system can be relatively small and light and the slurry can be stored in conventional liquid fuel tanks. When transported and stored, the conventional liquid fuel infrastructure can be used. • The particular metal hydride of interest in this project, magnesium hydride, forms benign byproducts, magnesium hydroxide (“Milk of Magnesia”) and magnesium oxide. • We have estimated that a magnesium hydride slurry system (including the mixer device and tanks) could meet the DOE 2010 energy density goals. ? During the investigation of hydriding techniques, we learned that magnesium hydride in a slurry can also be cycled in a rechargeable fashion. Thus, magnesium hydride slurry can act either as a chemical hydride storage medium or as a rechargeable hydride storage system. Hydrogen can be stored and delivered and then stored again thus significantly reducing the cost of storing and delivering hydrogen. Further evaluation and development of this concept will be performed as follow-on work under a

McClaine, Andrew W.

2008-09-30T23:59:59.000Z

56

CST/Water Slurry Mixing and Resuspension  

SciTech Connect

Crystalline Silicotitanate (CST) was selected as one of the alternatives to the In-Tank Precipitation Process (ITP) for removal of cesium from the salt waste at Savannah River Site. The proposed salt waste treatment process using CST would involve passing a filtered salt waste through a fixed bed of CST. The CST would remove the cesium from the salt waste by ion exchange and the decontaminated salt would be incorporated into the Saltstone Process. This report documents the results of investigations into the mixing and re-suspension characteristics of two 10 wt percent CST slurries.

Baich, M.A.

2001-02-13T23:59:59.000Z

57

MEASURING GASEOUS EMISSIONS FROM STORED PIG SLURRY S. Espagnol1  

E-Print Network (OSTI)

2 MEASURING GASEOUS EMISSIONS FROM STORED PIG SLURRY S. Espagnol1 , L. Loyon2 , F. Guiziou2 , P to measure emissions factors of ammonia (NH3), nitrous oxide (N2O) methane (CH4) and carbon dioxide (CO2) from stored pig slurry and measured the variations of the emissions in time and space. In 2006, dynamic

Boyer, Edmond

58

Lime slurry use at the Industrial Wastewater Pretreatment Facility  

SciTech Connect

The use of lime slurry at the IWPF demonstrated many benefits. Hazardous chemical use was reduced, solids handling was improved, water quality was enhanced and there has been a cost savings. The lime slurry also enabled the plant to begin treating the soluble oil waste, which we were not able to do in the past.

Rice, L.E. [Allied-Signal Aerospace Co., Kansas City, MO (United States). Kansas City Div.; Hughes, R.W. [Professional Services Group, Inc., Kansas City, MO (United States); Baggett, G. [Genex/Praxair, Inc., Kansas City, MO (United States)

1996-04-01T23:59:59.000Z

59

Rheological Modifier Testing with DWPF Process Slurries  

SciTech Connect

Rheological modification agents were tested on simulated SRAT and SME products to determine if a suitable agent could be found for the DWPF process slurries. The agents tested were dispersants that lower the rheological properties of slurries by preventing agglomerization. Dolapix CE64, an ethylene glycol, and Disperse-Ayd W28, a polyacrylate, were the most effective dispersants tested. Further evaluation and testing should be performed on Dolapix CE64 and Disperse-Ayd W28 to determine if implementation is possible in DWPF. The initial phase of future work will include optimization of the rheology modifier by the Illinois Institute of Technology (IIT) and development of a maximum concentration limit for the rheology modifiers. IIT has been commissioned to evaluate the properties of these chemicals to determine if the chemical makeup can be optimized to enhance the properties of these modifiers. An initial concentration limit based upon the DWPF flammability limit and other constraints should be calculated to determine the potential downstream impacts.

MICHAEL, STONE

2004-02-01T23:59:59.000Z

60

Solids flow rate measurement in dense slurries  

SciTech Connect

Accurate and rapid flow rate measurement of solids in dense slurries remains an unsolved technical problem, with important industrial applications in chemical processing plants and long-distance solids conveyance. In a hostile two-phase medium, such a measurement calls for two independent parameter determinations, both by non-intrusive means. Typically, dense slurries tend to flow in laminar, non-Newtonian mode, eliminating most conventional means that usually rely on calibration (which becomes more difficult and costly for high pressure and temperature media). These issues are reviewed, and specific solutions are recommended in this report. Detailed calculations that lead to improved measuring device designs are presented for both bulk density and average velocity measurements. Cross-correlation, chosen here for the latter task, has long been too inaccurate for practical applications. The cause and the cure of this deficiency are discussed using theory-supported modeling. Fluid Mechanics are used to develop the velocity profiles of laminar non-Newtonian flow in a rectangular duct. This geometry uniquely allows the design of highly accurate `capacitive` devices and also lends itself to gamma transmission densitometry on an absolute basis. An absolute readout, though of less accuracy, is also available from a capacitive densitometer and a pair of capacitive sensors yields signals suitable for cross-correlation velocity measurement.

Porges, K.G.; Doss, E.D.

1993-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

E-Print Network 3.0 - assisted abrasive based Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

made of our diamond nanocomposites, which stand up to the intense friction... superior fracture toughness and thermal stability with the abrasive power of diamond, our...

62

E-Print Network 3.0 - abrasive grinding wheels Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

under pressure, through or across... to grinding or lapping where the extruded abrasive media gently hones edges and surfaces. It is particularly... PROCESS MONITORING OF...

63

Astrophysical Jets  

SciTech Connect

Many astrophysical sources - especially those powered by release of gravitational energy - are associated with an outflow of material, generally taking place along the axis of symmetry of the system. In the most extreme cases, the outflow is accelerated to relativistic speeds; such a phenomenon is known as an astrophysical jet. When a relativistic jet points close to our line of sight, the observed radiation is strongly Doppler-boosted. Most spectacular cases of astrophysical jets are those produced by active galactic nuclei, where the measured spectrum - presumably dominated by the radiation from the jet - reaches up to the multi-GeV range. Our knowledge of these jets is limited: we don't fully understand how are they formed, collimated, and accelerated, and what is the process of conversion of the bulk energy of the jet into radiation. We anticipate that the increased sensitivity of GLAST will provide us with spectacular data yielding new insights as to their origin and structure.

Madejski, Grzegorz (SLAC) [SLAC

2006-05-01T23:59:59.000Z

64

Stellar jets  

E-Print Network (OSTI)

With a goal of understanding the conditions under which jets might be produced in novae and related objects, I consider the conditions under which jets are produced from other classes of accreting compact objects. I give an overview of accretion disk spectral states, including a discussion of in which states these jets are seen. I highlight the differences between neutron stars and black holes, which may help give us insights about when and how the presence of a solid surface may help or inhibit jet production.

Thomas J. Maccarone

2008-05-23T23:59:59.000Z

65

Gravitomagnetic jets  

SciTech Connect

We present a family of dynamic rotating cylindrically symmetric Ricci-flat gravitational fields whose geodesic motions have the structure of gravitomagnetic jets. These correspond to helical motions of free test particles up and down parallel to the axis of cylindrical symmetry and are reminiscent of the motion of test charges in a magnetic field. The speed of a test particle in a gravitomagnetic jet asymptotically approaches the speed of light. Moreover, numerical evidence suggests that jets are attractors. The possible implications of our results for the role of gravitomagnetism in the formation of astrophysical jets are briefly discussed.

Chicone, C.; Mashhoon, B. [Department of Mathematics and Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211 (United States); Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211 (United States)

2011-03-15T23:59:59.000Z

66

Solution of the Roth-Marques-Durian Rotational Abrasion Model  

E-Print Network (OSTI)

We solve the rotational abrasion model of Roth, Marques and Durian (arXiv:1009.3492), a one-dimensional quasilinear partial differential equation resembling the inviscid Burgers equation with the unusual feature of a step function factor as a coefficient. The complexity of the solution is primarily in keeping track of the cases in the piecewise function that results from certain amputation and interpolation processes, so we also extract from it a model of an evolving planar tree graph that tracks the evolution of the coarse features of the contour.

Bryan Gin-ge Chen

2010-12-10T23:59:59.000Z

67

Testing of In-Line Slurry Monitors and Pulsair Mixers with Radioactive Slurries  

SciTech Connect

Three in-line slurry monitoring instruments were demonstrated, tested, and evaluated for their capability to determine the transport properties of radioactive slurries. The instruments included the Endress + Hauser Promass 63M Coriolis meter for measuring density, the Lasentec M600P for measuring particle size distribution, and a prototype ultrasonic monitor that was developed by Argonne National Laboratory for measuring suspended solids concentration. In addition, the power consumption of the recirculation pump was monitored to determine whether this parameter could be used as a tool for in-line slurry monitoring. The Promass 63M and the M600P were also evaluated as potential indicators of suspended solids concentration. In order to use the Promass 63M as a suspended solids monitor, the densities of the fluid phase and the dry solid particle phase must be known. In addition, the fluid phase density and the dry solids density must remain constant, as any change will affect the correlation between the slurry density and the suspended solids concentration. For the M600P, the particle size distribution would need to remain relatively constant. These instruments were demonstrated and tested at the Gunite and Associated Tanks Remediation Project at the Oak Ridge National Laboratory. The testing of the instruments was conducted in parallel with the testing of a Pulsair mixing system, which was used to mix the contents of the selected tank. A total of six tests were performed. A submersible pump was positioned at two depths, while the Pulsair system was operated at three mixing rates.

Hylton, T.D.; Bayne, C.K.

1999-08-01T23:59:59.000Z

68

Slurry fired heater cold-flow modelling  

SciTech Connect

This report summarizes the experimental and theoretical work leading to the scale-up of the SRC-I Demonstration Plant slurry fired heater. The scale-up involved a theoretical model using empirical relations in the derivation, and employed variables such as flow conditions, liquid viscosity, and slug frequency. Such variables have been shown to affect the heat transfer characteristics ofthe system. The model assumes that, if all other variables remain constant, the heat transfer coefficient can be scaled up proportional to D/sup -2/3/ (D = inside diameter of the fired heater tube). All flow conditions, liquid viscosities, and pipe inclinations relevant to the demonstration plant have indicated a slug flow regime in the slurry fired heater. The annular and stratified flow regimes should be avoided to minimize the potential for excessive pipe erosion and to decrease temperature gradients along the pipe cross section leading to coking and thermal stresses, respectively. Cold-flow studies in 3- and 6.75-in.-inside-diameter (ID) pipes were conducted to determine the effect of scale-up on flow regime, slug frequency, and slug dimensions. The developed model assumes that conduction heat transfer occurs through the liquid film surrounding the gas slug and laminar convective heat transfer to the liquid slug. A weighted average of these two heat transfer mechanisms gives a value for the average pipe heat transfer coefficient. The cold-flow work showed a decrease in the observed slug frequency between the 3- and 6.75-ID pipes. Data on the ratio of gas to liquid slug length in the 6.75-in. pipe are not yet complete, but are expected to yield generally lower values than those obtained in the 3-in. pipe; this will probably affect the scale-up to demonstration plant conditions. 5 references, 15 figures, 7 tables.

Moujaes, S.F.

1983-07-01T23:59:59.000Z

69

Attrition and abrasion models for oil shale process modeling  

SciTech Connect

As oil shale is processed, fine particles, much smaller than the original shale are created. This process is called attrition or more accurately abrasion. In this paper, models of abrasion are presented for oil shale being processed in several unit operations. Two of these unit operations, a fluidized bed and a lift pipe are used in the Lawrence Livermore National Laboratory Hot-Recycle-Solid (HRS) process being developed for the above ground processing of oil shale. In two reports, studies were conducted on the attrition of oil shale in unit operations which are used in the HRS process. Carley reported results for attrition in a lift pipe for oil shale which had been pre-processed either by retorting or by retorting then burning. The second paper, by Taylor and Beavers, reported results for a fluidized bed processing of oil shale. Taylor and Beavers studied raw, retorted, and shale which had been retorted and then burned. In this paper, empirical models are derived, from the experimental studies conducted on oil shale for the process occurring in the HRS process. The derived models are presented along with comparisons with experimental results.

Aldis, D.F.

1991-10-25T23:59:59.000Z

70

Abrasion resistant coating and method of making the same  

DOE Patents (OSTI)

An abrasion resistant coating is created by adding a ductile phase to a brittle matrix phase during spray coating where an Al--Cu--Fe quasicrystalline phase (brittle matrix) and an FeAl intermetallic (ductile phase) are combined. This composite coating produces a coating mostly of quasicrystal phase and an inter-splat layer of the FeAl phase to help reduce porosity and cracking within the coating. Coatings are prepared by plasma spraying unblended and blended quasicrystal and intermetallic powders. The blended powders contain 1, 5, 10 and 20 volume percent of the intermetallic powders. The unblended powders are either 100 volume percent quasicrystalline or 100 volume percent intermetallic; these unblended powders were studied for comparison to the others. Sufficient ductile phase should be added to the brittle matrix to transform abrasive wear mode from brittle fracture to plastic deformation, while at the same time the hardness of the composite should not be reduced below that of the original brittle phase material.

Sordelet, Daniel J. (Ames, IA); Besser, Matthew F. (Urbandale, IA)

2001-06-05T23:59:59.000Z

71

Three-body abrasive wear of fine pearlite, nanostructured bainite and martensite  

E-Print Network (OSTI)

, U.K b Mechanical, Materials and Manufacturing, University of Nottingham Abstract The abrasive wearThree-body abrasive wear of fine pearlite, nanostructured bainite and martensite S. Das Bakshi1a- sion rates and wear coefficients are not very different for the three states, the mechanisms

Cambridge, University of

72

Wear 252 (2002) 322331 A physically-based abrasive wear model for composite materials  

E-Print Network (OSTI)

Wear 252 (2002) 322­331 A physically-based abrasive wear model for composite materials Gun Y. Leea 2001 Abstract A simple physically-based model for the abrasive wear of composite materials is presented based on the mechanics and mechanisms associated with sliding wear in soft (ductile)- matrix composites

Ritchie, Robert

73

Property maps for abrasion resistance of materials F.W. Zok *, A. Miserez  

E-Print Network (OSTI)

Property maps for abrasion resistance of materials F.W. Zok *, A. Miserez Materials Department and tangential loads, a mechanistic framework has been developed for assessing material resistance to initiation the plastic zone at sharp contacts. Material property groups that characterize abrasion resistance emerge from

Zok, Frank

74

Slurry Retrieval, Pipeline Transport & Plugging and Mixing Workshop  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Gary L. Smith - Office of Waste Processing (EM-21) Slurry Retrieval, Pipeline Transport & Plugging and Mixing Workshop 1 Dr. Gary L. Smith - Office of Waste Processing (EM-21) Dr. Adam P. Poloski - PNNL Michael W. Rinker - PNNL Rick Demmer - INL Dr. Arthur W. Etchells III - Consultant Benjamin E. Lewis, Jr. - ORNL Sharon L. Marra - SRNL November 6, 2008 PNNL-SA-63183 Slurry Handling Workshop  Background: A critical responsibility of DOE's Office of Environmental Management is the design, construction, and operation of equipment and facilities to process legacy radioactive waste slurries for safe, long-term disposal.  Goal: DOE Office of Engineering and Technology, Office of Environmental Management sponsored a slurry handling workshop.  Identify technical vulnerabilities and to reduce risk.  Understand and disseminate lessons learned and best practices

75

Modeling the structure of coal water slurry (CWS) sprays  

E-Print Network (OSTI)

This thesis describes a model of coal water slurry (CWS) sprays and presents new experimental data for CWS viscosities. The model is based on the aerodynamic theory of spray atomization which has been successfully used for Diesel sprays. However...

Prithiviraj, Manikandan

2012-06-07T23:59:59.000Z

76

Rapid Cooling Using Ice Slurries for Industrial and Medical Applicatio...  

NLE Websites -- All DOE Office Websites (Extended Search)

to replace chilled-water cooling systems in building complexes. Because of the high energy content of ice slurry, its cooling capacity is many times greater than that of...

77

Slurry burner for mixture of carbonaceous material and water  

DOE Patents (OSTI)

A carbonaceous material-water slurry burner includes a high pressure tip-emulsion atomizer for directing a carbonaceous material-water slurry into a combustion chamber for burning therein without requiring a support fuel or oxygen enrichment of the combustion air. Introduction of the carbonaceous material-water slurry under pressure forces it through a fixed atomizer wherein the slurry is reduced to small droplets by mixing with an atomizing air flow and directed into the combustion chamber. The atomizer includes a swirler located immediately adjacent to where the fuel slurry is introduced into the combustion chamber and which has a single center channel through which the carbonaceous material-water slurry flows into a plurality of diverging channels continuous with the center channel from which the slurry exits the swirler immediately adjacent to an aperture in the combustion chamber. The swirler includes a plurality of slots around its periphery extending the length thereof through which the atomizing air flows and by means of which the atomizing air is deflected so as to exert a maximum shear force upon the carbonaceous material-water slurry as it exits the swirler and enters the combustion chamber. A circulating coolant system or boiler feed water is provided around the periphery of the burner along the length thereof to regulate burner operating temperature, eliminate atomizer plugging, and inhibit the generation of sparklers, thus increasing combustion efficiency. A secondary air source directs heated air into the combustion chamber to promote recirculation of the hot combustion gases within the combustion chamber.

Nodd, Dennis G. (West Mifflin, PA); Walker, Richard J. (Bethel Park, PA)

1987-01-01T23:59:59.000Z

78

Relationships Between Abrasive Wear, Hardness, and Surface Grinding Characteristics of Titanium-Based Metal Matrix Composites  

SciTech Connect

The objective of this work was to support the development of grinding models for titanium metal-matrix composites (MMCs) by investigating possible relationships between their indentation hardness, low-stress belt abrasion, high-stress belt abrasion, and the surface grinding characteristics. Three Ti-based particulate composites were tested and compared with the popular titanium alloy Ti-6Al-4V. The three composites were a Ti-6Al-4V-based MMC with 5% TiB{sub 2} particles, a Ti-6Al-4V MMC with 10% TiC particles, and a Ti-6Al-4V/Ti-7.5%W binary alloy matrix that contained 7.5% TiC particles. Two types of belt abrasion tests were used: (a) a modified ASTM G164 low-stress loop abrasion test, and (b) a higher-stress test developed to quantify the grindability of ceramics. Results were correlated with G-ratios (ratio of stock removed to abrasives consumed) obtained from an instrumented surface grinder. Brinell hardness correlated better with abrasion characteristics than microindentation or scratch hardness. Wear volumes from low-stress and high-stress abrasive belt tests were related by a second-degree polynomial. Grindability numbers correlated with hard particle content but were also matrix-dependent.

Blau, Peter Julian [ORNL; Jolly, Brian C [ORNL

2009-01-01T23:59:59.000Z

79

Abrasive wear by coal-fueled diesel engine and related particles  

SciTech Connect

The development of commercially viable diesel engines that operate directly on pulverized coal-fuels will require solution to the problem of severe abrasive wear. The purpose of the work described in this report was to investigate the nature of the abrasive wear problem. Analytical studies were carried out to determine the characteristics of the coal-fuel and associated combustion particles responsible for abrasion. Laboratory pinon-disk wear tests were conducted on oil-particle mixtures to determine the relationship between wear rate and a number of different particle characteristics, contact parameters, specimen materials properties, and other relevant variables.

Ives, L.K. [National Inst. of Standards and Technology, Gaithersburg, MD (United States)

1992-09-01T23:59:59.000Z

80

Combined on-board hydride slurry storage and reactor system and process for hydrogen-powered vehicles and devices  

SciTech Connect

An on-board hydride storage system and process are described. The system includes a slurry storage system that includes a slurry reactor and a variable concentration slurry. In one preferred configuration, the storage system stores a slurry containing a hydride storage material in a carrier fluid at a first concentration of hydride solids. The slurry reactor receives the slurry containing a second concentration of the hydride storage material and releases hydrogen as a fuel to hydrogen-power devices and vehicles.

Brooks, Kriston P; Holladay, Jamelyn D; Simmons, Kevin L; Herling, Darrell R

2014-11-18T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

E-Print Network 3.0 - abrasion tool rat Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

wear model for composite materials Summary: . Axen, K.H. Zum-Gahr, Abrasive wear of TiC-steel composite clad layers on tool steel, Wear 157 (1992... Wear 252 (2002) 322-331 A...

82

Ice slurry technology can save heart attack victims, surgery patients  

NLE Websites -- All DOE Office Websites (Extended Search)

Ice Ice slurry technology can save heart attack victims, surgery patients Director's Welcome Organization Achievements Highlights Fact Sheets, Brochures & Other Documents Multimedia Library About Nuclear Energy Nuclear Reactors Designed by Argonne Argonne's Nuclear Science and Technology Legacy Opportunities within NE Division Visit Argonne Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Celebrating the 70th Anniversary of Chicago Pile 1 (CP-1) Argonne OutLoud on Nuclear Energy Argonne Energy Showcase 2012 Highlights Bookmark and Share Ice slurry technology can save heart attack victims, surgery patients Doctors use an endoscope to see the application of the slurry during a laparoscopic kidney surgery on a pig

83

Coal-CO2 Slurry Feeding System for Pressurized Gasifiers  

NLE Websites -- All DOE Office Websites (Extended Search)

Feed Systems Feed Systems Coal-CO2 Slurry Feeding System for Pressurized Gasifiers Massachusetts Institute of Technology Project Number: FE0012500 Project Description This project will develop and assess a slurry feeding system based on a suspension of coal in liquid CO2 that can be pumped into a high-pressure gasifier. The advantages of this solution are that CO2 has a low heat capacity, a low heat of vaporization and low viscosity. Thus, the liquid CO2 imposes a much smaller thermal load on the gasifier relative to a water slurry, and has the potential to improve the efficiency and economics of integrated gasification combined cycle (IGCC) power plants with carbon capture and dramatically reduce greenhouse gas emissions from coal fired power plants. Project Details

84

Ultrasonic study of concentrated coal?water slurries  

Science Journals Connector (OSTI)

The use of ultrasonicabsorptionmeasurements as a diagnostic tool for monitoring the particle size of coal?water slurries has been suggested by M. C. Davis [J. Acoust. Soc. Am. 65 387 (1979)]. The present paper reports some experimental data obtained from ultrasonicabsorption and velocity measurements on electrostatically and sterically stabilized coal?water slurries of average particle diameters of 5 and 50 ?. Ultrasonicabsorptionmeasurements were made in the frequency range of 1 to 25 MHz for 1 °C to 80 °C. The results are compared with various explicit expressions for heat conduction viscous drag losses and scattering of sound by particles. The experimental absorption was consistently higher than that predicted even when allowing for the averaging effect era wide particle size distribution. The experimental results also indicate that velocity measurements in a coal?water slurry have the potential of becoming another possible diagnostic tool along with attenuation measurements. [Work partially supported by ONR.

M. A. Barrett Gultepe; M. E. Gultepe; E. Yeager

1986-01-01T23:59:59.000Z

85

Coal-slurry pump development. Technical progress report No. 42  

SciTech Connect

The Coal-Slurry Pump Development Program was initiated in October 1979 and planned for completion in December 1982. A proposal has been submitted to extend the end date to 30 June 1983 and the program is continuing with the revised schedule. In the first phase an experimental prototype of a two-stage, high pressure, centrifugal slurry pump was fabricated and assembled into a test unit. In the second phase the experimental pump was delivered to the Colorado School of Mines Research Institute test facility for initial testing in hot oil and subsequent testing in a coal-oil slurry environment. Rocketdyne will supply technical support and coordination on test facility interface requirements and for testing of the experimental pump to evaluate hydraulic, mechanical, material and operational performance characteristics. Because of the recent significant activities accomplished, this monthly report will cover the period up to 12 April 1983.

Wong, G.S.

1983-04-15T23:59:59.000Z

86

E-Print Network 3.0 - acidified pig slurry Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

results for: acidified pig slurry Page: << < 1 2 3 4 5 > >> 1 Life Cycle Assessment of Biogas from Separated slurry Summary: AND ALTERNATIVES 28 2.2.1 Reference Scenario (Scenario...

87

Experimental studying on development of slurry-layer casting system for additive manufacturing of ceramics  

Science Journals Connector (OSTI)

Compared with powder-based process of additive manufacturing, slurry-based process can fabricate the ceramic ... the slurry with different formation used in the additive manufacturing of ceramic products, this st...

Hsiao Chuan Yen

2014-10-01T23:59:59.000Z

88

Method for maximizing the pumpability efficiency of a hydrocarbon slurry by controlling the wax crystal content  

SciTech Connect

The efficiency of pumping a hydrocarbon slurry in a pipeline is determined prior to transportation by the relationship: delta P AEBX wherein delta P is the pressure drop expected to be experienced by the slurry in the pipeline in pounds per square inch (psi), ''A'' and ''B'' are constants relating to the size of the pipeline, the flow rate of the slurry and the hydrodynamic volume of the wax crystals, and ''X'' is the wax crystal content in the slurry from the congealed particles in percentage by weight. The wax crystal content of the slurry is measured, such as by nuclear magnetic resonance and/or differential scanning calorimetry, and is used in conjunction with the constants ''A'' and ''B'' to determine the expected pressure drop of the slurry in a particular pipeline. The wax crystal content of the slurry may then be modified, if necessary, to obtain desirable or optimum slurry pumpability conditions for the pipeline.

Tackett, J.E.

1982-01-12T23:59:59.000Z

89

Experimental studies of 1 ton/day coal slurry feed type oxygen blown, entrained flow gasifier  

Science Journals Connector (OSTI)

Experimental Studies of a 1 Ton/Day coal slurry feed type oxygen blown, entrained flow gasifier have been performed with the slurry concentration and gasifier temperature at 65% and above 1,300...2.../coal feed r...

Young-Chan Choi; Tae-Jun Park; Jae-Ho Kim…

2001-07-01T23:59:59.000Z

90

THE FURNACE COMBUSTION AND RADIATION CHARACTERISTICS OF METHANOL AND A METHANOL/COAL SLURRY  

E-Print Network (OSTI)

Spectral Intensity With 5% Coal (x ::: 86.9 cm) CalculatedPredictions B. Methanol/Coal Slurry as the Fuel TemperatureMethanol as the Fuel B. Methanol/Coal Slurry as the Fuel C.

Grosshandler, W.L.

2010-01-01T23:59:59.000Z

91

Experimental Investigation of Combustion of Biomass Slurry in an Oil Fired Furnace  

Science Journals Connector (OSTI)

An experimental investigation of combustion of biomass slurry in an oil fired furnace was ... are presented. The calorific value of the biomass slurry increases with equivalence ratio initially, attains ... obser...

S. V. Prakash; S. R. Shankapal

2009-01-01T23:59:59.000Z

92

NOVEL SLURRY PHASE DIESEL CATALYSTS FOR COAL-DERIVED SYNGAS  

SciTech Connect

This report describes research conducted to support the DOE program in novel slurry phase catalysts for converting coal-derived synthesis gas to diesel fuels. The primary objective of this research program is to develop attrition resistant catalysts that exhibit high activities for conversion of coal-derived syngas.

Dr. Dragomir B. Bukur; Dr. Ketil Hanssen; Alec Klinghoffer; Dr. Lech Nowicki; Patricia O'Dowd; Dr. Hien Pham; Jian Xu

2001-01-07T23:59:59.000Z

93

Bentonite-water slurry rheology and cutoff wall trench stability  

SciTech Connect

The rheological behavior of bentonite-water slurry is responsible for its ability to stabilize trenches that are made for construction of subsurface barriers to ground water flow. This paper reviews the rheology of bentonite-water slurries and presents property values for a range of bentonite concentrations. Test results indicate that, if the D{sub 15} size of the native ground is less than 0.4 mm, it is likely that a bentonite filter cake will form on the face of an excavation supported by bentonite-water slurry. For soils that are too coarse for a filter cake to form, it was found that the penetration distance of slurry into the soil increases as the D{sub 5} size and void ratio of the soil increase. An expression for the factor of safety against local sloughing failure of the trench wall is presented. Local sloughing failures that occurred during construction of the cutoff wall at Island Copper Mine, Vancouver Island, BC, are discussed, and calculated factors of safety are in good agreement with the observed performance.

Filz, G.M. [Virginia Tech, Blacksburg, VA (United States); Boyer, R.D. [Langan Engineering and Environmental Services, Elmwood Park, NJ (United States); Davidson, R.R. [Woodward-Clyde Consultants, Denver, CO (United States)

1997-12-31T23:59:59.000Z

94

Effects of friction factor and slip factor on the performance of a centrifugal slurry pump  

E-Print Network (OSTI)

and concentration ratios for sand and glass bead slurries. Figures 16 and 17 show the calibration curves for the sand slurry and glass bead slurry respectively. 4. 3 Concentration Ratio Calculation The density of the slurry depends on the densities...+83 . 288E+83 FLSSATE (6PH) Figure 17. Calibration curve for elbowmeter for glass bead slurry. 43 by weight is given by equating Equations 4. 1 and 4. 2. Peng [19) has given it as: S s v w 1-C +S (4. 3) or C C s w (4. 4) Figure 18 shows...

Sheth, Ketankumar Kantilal

1985-01-01T23:59:59.000Z

95

Plugging nuclear waste pipelines: impact of high level waste slurry characteristics and pipe diameter  

SciTech Connect

The work presented here focuses on experiments carried out in 22-mm ID and 45-mm ID pipelines utilizing slurries composed of spherical glass beads having particle size distribution following the Rosin-Rammler distribution and mean size of 50 {mu}m. The spreads of the distribution were 1.7 and 7, corresponding to wide and narrow distributions, respectively. The slurries utilized in this study had concentrations ranging from 5% to 25% by volume. Results obtained in the same pipeline diameter indicated that the slurry of the narrower distribution experienced higher pressure drops and lower critical deposition velocities than those for the slurry of wider distribution. Pressure drop increased markedly with increasing slurry concentration regardless of the pipe diameter and slurry PSD. However, the pipe diameter was found to have more significant influence on the pressure drop than the slurry concentration does. (authors)

Daas, M.; Srivastava, R.; Skudarnov, P. [Florida International Univ., Applied Research Center, Miami, FL (United States)

2007-07-01T23:59:59.000Z

96

Slurry atomizer for a coal-feeder and dryer used to provide coal at gasifier pressure  

DOE Patents (OSTI)

The present invention is directed to a coal-water slurry atomizer for use a high-pressure dryer employed in a pumping system utilized to feed coal into a pressurized coal gasifier. The slurry atomizer is provided with a venturi, constant area slurry injection conduit, and a plurality of tangentially disposed steam injection ports. Superheated steam is injected into the atomizer through these ports to provide a vortical flow of the steam, which, in turn, shears slurry emerging from the slurry injection conduit. The droplets of slurry are rapidly dispersed in the dryer through the venturi where the water is vaporized from the slurry by the steam prior to deleterious heating of the coal.

Loth, John L. (Morgantown, WV); Smith, William C. (Morgantown, WV); Friggens, Gary R. (Morgantown, WV)

1982-01-01T23:59:59.000Z

97

RHEOLOGICAL AND ELEMENTAL ANALYSES OF SIMULANT SB5 SLURRY MIX EVAPORATOR-MELTER FEED TANK SLURRIES  

SciTech Connect

The Defense Waste Processing Facility (DWPF) will complete Sludge Batch 5 (SB5) processing in fiscal year 2010. DWPF has experienced multiple feed stoppages for the SB5 Melter Feed Tank (MFT) due to clogs. Melter throughput is decreased not only due to the feed stoppage, but also because dilution of the feed by addition of prime water (about 60 gallons), which is required to restart the MFT pump. SB5 conditions are different from previous batches in one respect: pH of the Slurry Mix Evaporator (SME) product (9 for SB5 vs. 7 for SB4). Since a higher pH could cause gel formation, due in part to greater leaching from the glass frit into the supernate, SRNL studies were undertaken to check this hypothesis. The clogging issue is addressed by this simulant work, requested via a technical task request from DWPF. The experiments were conducted at Aiken County Technology Laboratory (ACTL) wherein a non-radioactive simulant consisting of SB5 Sludge Receipt and Adjustment Tank (SRAT) product simulant and frit was subjected to a 30 hour SME cycle at two different pH levels, 7.5 and 10; the boiling was completed over a period of six days. Rheology and supernate elemental composition measurements were conducted. The caustic run exhibited foaming once, after 30 minutes of boiling. It was expected that caustic boiling would exhibit a greater leaching rate, which could cause formation of sodium aluminosilicate and would allow gel formation to increase the thickness of the simulant. Xray Diffraction (XRD) measurements of the simulant did not detect crystalline sodium aluminosilicate, a possible gel formation species. Instead, it was observed that caustic conditions, but not necessarily boiling time, induced greater thickness, but lowered the leach rate. Leaching consists of the formation of metal hydroxides from the oxides, formation of boric acid from the boron oxide, and dissolution of SiO{sub 2}, the major frit component. It is likely that the observed precipitation of Mg(OH){sub 2} and Mn(OH){sub 2} caused the increase in yield stress. The low pH run exhibited as much as an order of magnitude greater B and Li (frit components) leachate concentrations in the supernate. At high pH a decrease of B leaching was found and this was attributed to adsorption onto Mg(OH){sub 2}. A second leaching experiment was performed without any sludge to deconvolute the leach rate behavior of Frit 418 from those of the SB5 sludge-Frit 418 system. At high pH, the sludgeless system demonstrated very fast leaching of all the frit components, primarily due to fast dissolution of the main component, silica, by hydroxide anion; various semiconductor studies have established this reactivity. Overall, the frit-water system exhibited greater leaching from a factor two to almost three orders of magnitude (varying by conditions and species). The slower leaching of the sludge system is possibly due to a greater ionic strength or smaller driving force. Another possible reason is a physical effect, coating of the frit particles with sludge; this would increase the mass transfer resistance to leaching. Based on this study, the cause of clogs in the melter feed loop is still unknown. A possible explanation is that the SME product, like the simulant, is too thin and could contribute to a loss of two-phase flow which could cause plugging of a restricted and poorly mixed zone like the melter feed loop. This is feasible since a previous study of a slurry showed an increase in resistance to flow at lower flow rates. Testing with a radioactive SME sample is underway and should help understand this potential mechanism.

Fernandez, A.

2010-02-08T23:59:59.000Z

98

Inclusive Jets in PHP  

E-Print Network (OSTI)

Differential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q^2 < 1 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb^-1. Jets were identified in the laboratory frame using the k_T, anti-k_T or SIScone jet algorithms. Cross sections are presented as functions of the jet pseudorapidity, eta(jet), and the jet transverse energy, E_T(jet). Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low E_T(jet) and high eta(jet). The cross sections have the potential to improve the determination of the PDFs in future QCD fits. Values of alpha_s(M_Z) have been extracted from the measurements based on different jet algorithms. In addition, the energy-scale dependence of the strong coupling was determined.

Roloff, Philipp

2013-01-01T23:59:59.000Z

99

Inclusive Jets in PHP  

E-Print Network (OSTI)

Differential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q^2 < 1 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb^-1. Jets were identified in the laboratory frame using the k_T, anti-k_T or SIScone jet algorithms. Cross sections are presented as functions of the jet pseudorapidity, eta(jet), and the jet transverse energy, E_T(jet). Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low E_T(jet) and high eta(jet). The cross sections have the potential to improve the determination of the PDFs in future QCD fits. Values of alpha_s(M_Z) have been extracted from the measurements based on different jet algorithms. In addition, the energy-scale dependence of the strong coupling was determined.

Philipp Roloff

2013-10-23T23:59:59.000Z

100

Freeforming of Ceramics and Composites from Colloidal Slurries  

SciTech Connect

This report is a summary of the work completed for an LDRD project. The objective of the project was to develop a solid freeform fabrication technique for ceramics and composites from fine particle slurries. The work was successful and resulted in the demonstration of a manufacturing technique called robocasting. Some ceramic components may pow be fabricated without the use of molds or tooling by dispensing colloidal suspensions through an orifice and stacking two-dimensional layers into three-dimensional shapes. Any conceivable two-dimensional pattern may be ''written'' layer by layer into a three-dimensional shape. Development of the robocasting technique required the materials expertise for fabrication and theological control of very highly concentrated fine particle slurries, and development of robotics for process control and optimization. Several ceramic materials have been manufactured and characterized. Development of techniques for robocasting multiple materials simultaneously have also been developed to build parts with unique structures or graded compositions.

CESARANO III,JOSEPH; DENHAM,HUGH B.; STUECKER,JOHN N.; BAER,THOMAS A.; GRIFFITH,MICHELLE L.

1999-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Coal slurry letdown valve-concept test phase. Final report  

SciTech Connect

The results of the concept test phase of a novel pressure letdown device indicate usefulness of the concept. The device, using staged letdown, was designed to minimize erosion damage by minimizing slurry velocities through the pressure restrictions. Tests were performed on air, steam/water and a coal slurry with a flashing component. Two valve sizes were used. Based on the results of these tests, the following conclusions were drawn: (1) the basic operating principle of designing for a constant velocity through the orifice restrictions is correct; (2) multiphase pressure letdown can be modeled; (3) temperature profiles are predictable; and (4) erosion in three-phase flow is a complex phenomenon. Recommendations for further work on the device include: (1) development of a controllable device; (2) correlation of further test data; and (3) study of flow regimes where erosion is minimized. 9 refs., 48 figs., 6 tabs.

Collins, E.R. Jr.; Suitor, J.W.

1984-01-01T23:59:59.000Z

102

Process for gasifying carbonaceous material from a recycled condensate slurry  

DOE Patents (OSTI)

Coal or other carbonaceous material is gasified by reaction with steam and oxygen in a manner to minimize the problems of effluent water stream disposal. The condensate water from the product gas is recycled to slurry the coal feed and the amount of additional water or steam added for cooling or heating is minimized and preferably kept to a level of about that required to react with the carbonaceous material in the gasification reaction. The gasification is performed in a pressurized fluidized bed with the coal fed in a water slurry and preheated or vaporized by indirect heat exchange contact with product gas and recycled steam. The carbonaceous material is conveyed in a gas-solid mixture from bottom to top of the pressurized fluidized bed gasifier with the solids removed from the product gas and recycled steam in a supported moving bed filter of the resulting carbonaceous char. Steam is condensed from the product gas and the condensate recycled to form a slurry with the feed coal carbonaceous particles.

Forney, Albert J. (Coraopolis, PA); Haynes, William P. (Pittsburgh, PA)

1981-01-01T23:59:59.000Z

103

Interaction of organic additives with ceramic surfaces in colloidal slurries  

SciTech Connect

Three different dispersants, a low molecular weight compound (aminoalkanol), a polymer (polyelectrolyte) and a block-co-polymer (block polyethylenoxide-polyacrylic acid) were investigated with AFM and rheology in an aqueous system in order to elucidate the influence of the size and structure of the molecule on the dispersion stabilization. The AFM studies indicate that the aminoalkanol gives repulsive forces due to electrostatic repulsion only. The polyelectrolyte seems to stabilize the dispersion with both steric and electrostatic repulsive forces. A new compound that was designed for pure steric stabilization in aqueous media a block-co-polymer consisting of a polar anchor block and a stabilizing neutral chain was investigated for its behavior. The AFM measurements show that it is likely that this compound causes repulsion of silicon nitride surfaces due to steric repulsion only. Rheological measurements of aqueous powder slurries show that the adsorption of the organic additives is of great importance. Due to a more silicon dioxide like acidic surface of the investigated Si{sub 3}N{sub 4}-powder the carboxylate anions of the block-co-polymer adsorb badly. Therefore, no sterically repulsive forces can be built up. This then causes an increase in the slurry`s viscosity.

Sigmund, W.M.; Wang, L.; Sindel, J.; Rotov, M.; Aldinger, F. [Univ. of Stuttgart (Germany). Inst. fuer Nichtmetallische Anorganische Materialien

1997-08-01T23:59:59.000Z

104

Superheated fuel injection for combustion of liquid-solid slurries  

DOE Patents (OSTI)

A method and device are claimed for obtaining, upon injection, flash evaporation of a liquid in a slurry fuel to aid in ignition and combustion. The device is particularly beneficial for use of coal-water slurry fuels in internal combustion engines such as diesel engines and gas turbines, and in external combustion devices such as boilers and furnaces. The slurry fuel is heated under pressure to near critical temperature in an injector accumulator, where the pressure is sufficiently high to prevent boiling. After injection into a combustion chamber, the water temperature will be well above boiling point at a reduced pressure in the combustion chamber, and flash boiling will preferentially take place at solid-liquid surfaces, resulting in the shattering of water droplets and the subsequent separation of the water from coal particles. This prevents the agglomeration of the coal particles during the subsequent ignition and combustion process, and reduces the energy required to evaporate the water and to heat the coal particles to ignition temperature. The overall effect will be to accelerate the ignition and combustion rates, and to reduce the size of the ash particles formed from the coal. 2 figs., 2 tabs.

Robben, F.A.

1984-10-19T23:59:59.000Z

105

Development of experimental methods for the evaluation of aggregate resistance to polishing, abrasion, and breakage  

E-Print Network (OSTI)

Experiment...................................................54 4.2 Aggregate Texture, Before and After Micro-Deval................................................60 4.3 Ranking of the Aggregates Using Three Different Criteria... aggregate resistance to polishing, abrasion, and breakage. ? Chapter III discusses the analysis of variability in AIMS and Micro-Deval measurements. Measurements were conducted at the Texas Transportation Institute (TTI) and Texas Department...

Mahmoud, Enad Muhib

2007-04-25T23:59:59.000Z

106

Theoretical analysis of convective heat transfer enhancement of microencapsulated phase change material slurries  

Science Journals Connector (OSTI)

...This paper analyzes the convective heat transfer enhancement mechanism of microencapsulated phase change material slurries based on the analogy between convective ... addition, the conventional Nusselt number ...

Yinping Zhang; Xianxu Hu; Xin Wang

2003-12-01T23:59:59.000Z

107

Test Loop Demonstration and Evaluation of Slurry Transfer Line Critical Velocity Measurement Instruments  

SciTech Connect

This report presents the results of the evaluation of three ultrasonic sensors for detecting critical velocity during slurry transfer between the Hanford tank farms and the WTP.

Bontha, Jagannadha R.; Jenks, Jeromy WJ; Morgen, Gerald P.; Peters, Timothy J.; Wilcox, Wayne A.; Adkins, Harold E.; Burns, Carolyn A.; Greenwood, Margaret S.; MacFarlan, Paul J.; Denslow, Kayte M.; Schonewill, Philip P.; Blanchard, Jeremy; Baer, Ellen BK

2010-07-31T23:59:59.000Z

108

E-Print Network 3.0 - anaerobic soil slurry Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Aberystwyth Collection: Environmental Sciences and Ecology 2 Life Cycle Assessment of Biogas from Separated slurry Summary: scenarios. In fact, anaerobic digestion of animal...

109

Evaluation of the transport and resuspension of a simulated nuclear waste slurry: Nuclear Waste Treatment Program  

SciTech Connect

The Department of Chemical Engineering at the University of Idaho conducted research on the transport and resuspension of a simulated high-level nuclear waste slurry. In the United States, the reference process for treating both defense and civilian HLLW is vitrification using the liquid-fed ceramic melter process. The non-Newtonian behavior of the slurry complicates the evaluation of the transport and resuspension characteristics of the slurry. The resuspension of a simulated (nonradioactive) melter feed slurry was evaluated using a slurry designated as WV-205. The simulated slurry was developed for the West Valley Demonstration Project and was used during a pilot-scale ceramic melter (PSCM) experiment conducted at PNL in July 1985 (PSCM-21). This study involved determining the transport characteristics of a fully suspended slurry and the resuspension characteristics of settled solids in a pilot-scale pipe loop. The goal was to predict the transport and resuspension of a full-scale system based on rheological data for a specific slurry. The rheological behavior of the slurry was evaluated using a concentric cylinder rotational viscometer, a capillary tube viscometer, and the pilot-scale pipe loop. The results obtained from the three approaches were compared. 40 refs., 74 figs., 15 tabs.

Carleson, T.E.; Drown, D.C.; Hart, R.E.; Peterson, M.E.

1987-09-01T23:59:59.000Z

110

Precipitate hydrolysis process for the removal of organic compounds from nuclear waste slurries  

DOE Patents (OSTI)

A process for removing organic compounds from a nuclear waste slurry comprising reacting a mixture of radioactive waste precipitate slurry and an acid in the presence of a catalytically effective amount of a copper (II) catalyst whereby the organic compounds in the precipitate slurry are hydrolyzed to form volatile organic compounds which are separated from the reacting mixture. The resulting waste slurry, containing less than 10 percent of the orginal organic compounds, is subsequently blended with high level radioactive sludge and transferred to a virtrification facility for processing into borosilicate glass for long-term storage.

Doherty, Joseph P. (Elkton, MD); Marek, James C. (Augusta, GA)

1989-01-01T23:59:59.000Z

111

Precipitate hydrolysis process for the removal of organic compounds from nuclear waste slurries  

DOE Patents (OSTI)

A process for removing organic compounds from a nuclear waste slurry comprising reacting a mixture of radioactive waste precipitate slurry and an acid in the presence of a catalytically effective amount of a copper(II) catalyst whereby the organic compounds in the precipitate slurry are hydrolyzed to form volatile organic compounds which are separated from the reacting mixture. The resulting waste slurry, containing less than 10 percent of the original organic compounds, is subsequently blended with high level radioactive sludge land transferred to a vitrification facility for processing into borosilicate glass for long-term storage. 2 figs., 3 tabs.

Doherty, J.P.; Marek, J.C.

1987-02-25T23:59:59.000Z

112

Fundamental Mechanisms of Copper CMP – Passivation Kinetics of Copper in CMP Slurry Constituents  

E-Print Network (OSTI)

Tribochemical Mechanisms of Copper Chemical MechanicalE06-02 Fundamental Mechanisms of Copper CMP – PassivationKinetics of Copper in CMP Slurry Constituents Shantanu

Tripathi, Shantanu; Doyle, F M; Dornfeld, David

2009-01-01T23:59:59.000Z

113

Degradation Of Selected Organic Agrochemicals In Artificial Soil Slurry Systems By Anodic Fenton Treatment .  

E-Print Network (OSTI)

??This thesis investigated the application of anodic Fenton treatment to the degradation of several probe agrochemicals in model soil slurry systems. A kinetic model, called… (more)

Ye, Peng

2009-01-01T23:59:59.000Z

114

Performance of an IGCC Plant with Carbon Capture and Coal-CO2-Slurry Feed: Impact of Coal Rank, Slurry Loading, and Syngas Cooling Technology  

Science Journals Connector (OSTI)

The significant performance improvement reported by Dooher et al. for a plant with CO2 slurry feed reveals its potential and the need to develop a more fundamental understanding of the differences between water and liquid carbon dioxide as slurrying media and how these may affect individual process units for coals of different rank. ... It corresponds to the arrangement proposed by Dooher et al.,(19) in which the slurry transport medium is directly injected into the gasifier with the solid feedstock and O2. ...

Cristina Botero; Randall P. Field; Robert D. Brasington; Howard J. Herzog; Ahmed F. Ghoniem

2012-08-23T23:59:59.000Z

115

Method of preparing a high solids content, low viscosity ceramic slurry  

DOE Patents (OSTI)

A method for producing a high solids content, low viscosity ceramic slurry composition comprises turbomilling a dispersion of a ceramic powder in a liquid to form a slurry having a viscosity less than 100 centipoise and a solids content equal to or greater than 48 volume percent.

Tiegs, T.N.; Wittmer, D.E.

1995-10-10T23:59:59.000Z

116

Method of preparing a high solids content, low viscosity ceramic slurry  

DOE Patents (OSTI)

A method for producing a high solids content, low viscosity ceramic slurry composition comprises turbomilling a dispersion of a ceramic powder in a liquid to form a slurry having a viscosity less than 100 centipoise and a solids content equal to or greater than 48 volume percent.

Tiegs, Terry N. (Lenoir City, TN); Wittmer, Dale E. (Carbondale, IL)

1995-01-01T23:59:59.000Z

117

Dispersed slurry catalysts for hydroconversion of carbonaceous materials  

SciTech Connect

Dispersed slurry catalysts, based upon the in situ sulfided forms of transition metals such as iron and molybdenum, have been developed and successfully employed in the multi-stage hydroconversion of various carbonaceous materials including coal, heavy petroleum resid, waste plastics, and different combinations of these feedstocks. For example, using HTI`s proprietary iron-based catalyst and commercial Molyvan-A additive, over 95% maf coal conversion has been obtained accompanied by over 90% maf conversion of 524{degrees}C+ residuum and over 65% maf yield of C{sub 4}-524{degrees}C distillate yield in a fully back-mixed high pressure reaction system. The use of an in-fine fixed-bed hydrotreater in such a hydroconversion process that relies only on dispersed slurry catalysts for conversion allows to selectively upgrade the light distillate products (IBP-400{degrees}C) from the process resulting in premium quality naphtha and mid-distillate products with less than 10 ppm nitrogen, an FUC ratio of 1.9, and about 20 ppm sulfur. The use of dispersed catalyst for such hydroconversion processes has a significant positive impact (as much as 20% cost potential reduction) on the process economics because the reactor throughput can be increased by as much as 70 % while maintaining the equivalent residence time and the cost associated with the expensive high pressure catalyst addition/withdrawal system, used for supported extrudate catalyst, and that associated with expensive ebullating pumps can be reduced or eliminated completely.

Lee, L.K.; Pradhan, V.R.; Popper, G.; Comolli, A.G. [Hydrocarbon Technologies, Inc., Lawrenceville, NJ (United States)

1996-12-31T23:59:59.000Z

118

Transcript of "Laparoscopic Partial Nephrectomy with Ice Slurry as Coolant  

NLE Websites -- All DOE Office Websites (Extended Search)

ESE | NE | Site Index | Contact us | Help | Privacy/Security ESE | NE | Site Index | Contact us | Help | Privacy/Security Notice Home > Capabilities > Biomedical Applications > Medical Ice Slurry Coolants > Laparoscopic Partial Nephrectomy with Ice Slurry as Coolant in the Porcine Model > Transcript The Multimedia Collection Laparoscopic Partial Nephrectomy with Ice Slurry as Coolant in the Porcine Model Laparoscopic Partial Nephrectomy with Ice Slurry as Coolant in the Porcine Model VIDEO TRANSCRIPT Achieving optimal hypothermia of the kidney during laparoscopic partial nephrectomy remains a challenge and also an obstacle for wide-spread adoption of this technique for nephron-sparing surgery. Other approaches for renal cooling such as perfusion of the renal collecting system or vasculature with cold saline are either ineffective or cumbersome. In this study we assess the application of ice slurry as kidney cooling during laparoscopic partial nephrectomy in the porcine model. This study was performed in collaboration with Argonne National Laboratory.

119

Separate determination of PM10 emission factors of road traffic for tailpipe emissions and emissions from abrasion and resuspension processes  

Science Journals Connector (OSTI)

Little is known about the relevance of mechanically produced particles of road traffic from abrasion and resuspension processes in relation to the exhaust pipe particles. In this paper, emission factors of PM10 and PM1 for light and heavy-duty vehicles were derived for different representative traffic regimes from concentration differences of particles and nitrogen oxides (NOx) in ambient air upwind and downwind of busy roads, or alternatively of kerbsides and nearby background sites. Hereby, PM1 was interpreted as direct exhaust emissions and PM10-PM1 as mechanically produced emissions from abrasion and resuspension processes. The results show that abrasion and resuspension processes represent a significant part of the total primary PM10 emissions of road traffic. At sites with relatively undisturbed traffic flow they are in the same range as the exhaust pipe emissions. At sites with disturbed traffic flow due to traffic lights, emissions from abrasion/resuspension are even higher than those from the exhaust pipes.

Robert Gehrig; Matz Hill; Brigitte Buchmann; David Imhof; Ernest Weingartner; Urs Baltensperger

2004-01-01T23:59:59.000Z

120

Experimental Study on Finishing Forces in Double Disk Magnetic Abrasive Finishing Process While Finishing Paramagnetic Workpiece  

Science Journals Connector (OSTI)

Abstract Knowledge of finishing forces is important in any manufacturing process as the surface integrity of the finished surface is being affected. In the present work finishing force and torque were measured for a recently developed double disk magnetic abrasive finishing process. Investigations have been made to understand the effect of process factors namely upper and lower working gap rotational speed, abrasive weight percentage on the normal finishing force and finishing torque. Experiments were planned and performed based on Taguchi L9 orthogonal array. Analysis of variance has been used to analyze the experimental data. The analysis of the experimental data showed that normal finishing forces is affected most significantly by lower and upper working gap and finishing torque is effected mostly by the lower working gap and rotational speed of the magnetic disk. The surfaces finished by DDMAF process are characterized by SEM and the surface morphology has been correlated to finishing force and torque values.

Prateek Kala; Pulak M. Pandey

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Processing and mechanical properties of silicon nitride formed by robocasting aqueous slurries  

SciTech Connect

Robocasting is a new freeform fabrication technique for dense ceramics. It uses robotics to control deposition of ceramic slurries through an orifice. The optimization of concentrated aqueous Si{sub 3}N{sub 4} slurry properties to achieve high green density robocast bodies and subsequent high sintered densities was investigated. The effects of pH, electrolyte, additives and solids loading on the dispersion and rheological properties of Si{sub 3}N{sub 4} slurries were determined. The mechanical behavior of sintered robocast bars was determined and compared to conventionally produced silicon nitride ceramics.

HE,GUOPING; HIRSCHFELD,DEIDRE A.; CESARANO III,JOSEPH

2000-01-26T23:59:59.000Z

122

Design of Slurry Bubble Column Reactors: Novel Technique for Optimum Catalyst Size Selection  

NLE Websites -- All DOE Office Websites (Extended Search)

Slurry Bubble Column Reactors: Novel Technique Slurry Bubble Column Reactors: Novel Technique for Optimum Catalyst Size Selection Opportunity The Department of Energy's National Energy Technology Laboratory (NETL) is seeking licensing partners interested in implementing United States Patent Number 7,619,011 entitled "Design of Slurry Bubble Column Reactors: Novel Technique for Optimum Catalyst Size Selection." Disclosed in this patent is a method to determine the optimum catalyst particle size for application in a fluidized bed reactor, such as a slurry bubble column reactor (SBCR), to convert synthesis gas into liquid fuels. The reactor can be gas-solid, liquid- solid, or gas-liquid-solid. The method considers the complete granular temperature balance based on the kinetic theory of

123

Spray drying and attrition behavior of iron catalysts for slurry phase Fischer-Tropsch synthesis  

E-Print Network (OSTI)

This thesis describes results of a study aimed at developing and evaluating attrition resistant iron catalysts prepared by spray drying technique. These catalysts are intended for Fischer-Tropsch (F-T) synthesis in a slurry bubble column reactor...

Carreto Vazquez, Victor Hugo

2004-11-15T23:59:59.000Z

124

Rapid Coal Analysis. Part II: Slurry Atomization DCP Emission Analysis of NBS Coal  

Science Journals Connector (OSTI)

A McCrone Micronising Mill is used to wet grind NBS bituminous coal to a median particle diameter of 5.7 ?m within 10 min. The finely divided coal slurry is immediately nebulized...

McCurdy, D L; Wichman, M D; Fry, R C

1985-01-01T23:59:59.000Z

125

Coal-water slurry fuel internal combustion engine and method for operating same  

DOE Patents (OSTI)

An internal combustion engine fueled with a coal-water slurry is described. About 90 percent of the coal-water slurry charge utilized in the power cycle of the engine is directly injected into the main combustion chamber where it is ignited by a hot stream of combustion gases discharged from a pilot combustion chamber of a size less than about 10 percent of the total clearance volume of main combustion chamber with the piston at top dead center. The stream of hot combustion gases is provided by injecting less than about 10 percent of the total coal-water slurry charge into the pilot combustion chamber and using a portion of the air from the main combustion chamber that has been heated by the walls defining the pilot combustion chamber as the ignition source for the coal-water slurry injected into the pilot combustion chamber.

McMillian, Michael H. (Fairmont, WV)

1992-01-01T23:59:59.000Z

126

Coal slurry pump development. Fossil energy annual summary technical information report  

SciTech Connect

The Coal Slurry Pump Development Program was initiated in October 1979, and was completed 15 December 1983. In the first phase of the program (Phase IIB), an experimental prototype of a two-stage, high pressure, centrifugal slurry pump was fabricated and assembled into a test unit. In the second phase (Phase IIC), the experimental pump was delivered to a slurry test facility prepared at the Colorado School of Mines Research Institute (CSMRI) and initial testing in hot oil and subsequent testing in a coal-oil slurry environment were completed. During the test program, Rocketdyne supplied technical support and coordination on test facility interface requirements and directed testing of the experimental pump to evaluate hydraulic performance, and wear life characteristics. 3 figures, 3 tables.

Wong, G.S.

1983-10-31T23:59:59.000Z

127

Thermal Performance of Microencapsulated Phase Material (MPCM) Slurry in a Coaxial Heat Exchanger  

E-Print Network (OSTI)

Microencapsulated phase change material (MPCM) slurries and coil heat exchangers had been recently studied separately as enhancers of convective heat transfer processes. Due to the larger apparent heat related to the phase change process...

Yu, Kun

2014-05-08T23:59:59.000Z

128

Heat Transfer of a Multiple Helical Coil Heat Exchanger Using a Microencapsulated Phase Change Material Slurry  

E-Print Network (OSTI)

The present study has focused on the use of coil heat exchangers (CHEs) with microencapsulated phase change material (MPCM) slurries to understand if CHEs can yield greater rates of heat transfer. An experimental study was conducted using a...

Gaskill, Travis

2012-02-14T23:59:59.000Z

129

Rheological Study of Comingled Biomass and Coal Slurries with HydrothermalPretreatment  

E-Print Network (OSTI)

4) Bridgwater, T. Biomass for energy. J. Sci. Food Agric.A. Method for high energy density biomass-water slurry. U.S.substituting biomass for fossil fuels. Energy (2) Henrich,

He, W; Park, C S; Norbeck, J N

2009-01-01T23:59:59.000Z

130

Rheological Study of Comingled Biomass and Coal Slurries with HydrothermalPretreatment  

E-Print Network (OSTI)

Sirkeci, A. A. ; Dincer, H. The effect of coal properties onthe viscosity of coal-water slurries. Fuel 2002, 81, 1855– (H. ; Atesok, G. Effect of coal particle size distribution,

He, W; Park, C S; Norbeck, J N

2009-01-01T23:59:59.000Z

131

Supercritical CO2 extraction of organic compounds from soil-water slurries  

E-Print Network (OSTI)

SUPERCRITICAL COi EXTRACTION OF ORGANIC COMPOUNDS FROM SOIL-WATER SLURRIES A Thesis by BRIAN DEAN CARTER Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE August 1993 Major Subject: Chemical Engineering SUPERCRITICAL COz FXTRACTION OF ORGANIC COMPOUNDS FROM SOIL-WATER SLURRIES A Thesis by BRIAN DEAN CARTER Submitted to Texas A&M University in partial fulfillment of the requirements...

Carter, Brian Dean

2012-06-07T23:59:59.000Z

132

Rheological study of comingled biomass and coal slurries with hydrothermal pretreatment  

SciTech Connect

Gasification of comingled biomass and coal feedstock is an effective means of reducing the net life cycle greenhouse gas emissions in the coal gasification process while maintaining its inherent benefits of abundance and high-energy density. However, feeding a comingled biomass and coal feedstock into a pressurized gasification reactor poses a technical problem. Conventional dry feeding systems, such as lock hoppers and pressurized pneumatic transport, are complex and operationally expensive. A slurry formation of comingled biomass and coal feedstock can be easily fed into the gasification reactor but, in normal conditions, only allows for a small portion of biomass in the mixture. This is a consequence of the hydroscopic and hydrophilic nature of the biomass. The College of Engineering Center for Environmental Research and Technology (CE-CERT) at the University of California, Riverside, has developed a process producing high solid content biomass-water slurry using a hydrothermal pretreatment process. In this paper, the systematic investigation of the rheological properties (e.g., shear rate, shear stress, and viscosity) of coal-water slurries, biomass-water slurries, and comingled biomass and coal-water slurries is reported. The solid particle size distribution in the slurry and the initial solid/water ratio were investigated to determine the impact on shear rate and viscosity. This was determined using a rotational rheometer. The experimental results show that larger particle size offers better pumpability. The presence of a high percentage of biomass in solid form significantly decreases slurry pumpability. It is also shown that the solid loading of the biomass-water slurry can be increased to approximately 35 wt % with viscosity of less than 0.7 Pa.s after the pretreatment process. The solid loading increased to approximately 45 wt % when the biomass is comingled with coal. 18 refs., 7 figs., 3 tabs.

Wei He; Chan S. Park; Joseph M. Norbeck [University of California, Riverside, CA (United States). Bourns College of Engineering Center for Environmental Research and Technology

2009-09-15T23:59:59.000Z

133

Thorium oxide slurries as blankets in fissile producing fusion- fission hybrids  

E-Print Network (OSTI)

of the blanket as related to the energy of the incident fusion neutrons. CALCULATIONAL MODEL The MARS computer code package from the Radiation Shielding Information Center (RSIC) at Oak Ridge National Laboratory (ORNL) 11 was used to determine... the aqueous homogeneous power reactor program at ORNL was begun. Significant progress was made in studies of uranium oxide (UO ) and its slurries, and in the development of equipment for circulating slurries at concentrations of several hundred grams per...

Geer, Thomas Charles

1982-01-01T23:59:59.000Z

134

J_{E_T}: A Global Jet Finding Algorithm  

E-Print Network (OSTI)

We introduce a new jet-finding algorithm for a hadron collider based on maximizing a J_{E_T} function for all possible combinations of particles in an event. This function prefers a larger value of the jet transverse energy and a smaller value of the jet mass. The jet shape is proved to be a circular cone in Cartesian coordinates with the geometric center shifted from the jet momentum toward the central region. The jet cone size shrinks for a more forward jet. We have implemented our J_{E_T} algorithm with a reasonable running time scaling as N n^3, where "N" is the total number of particles and "n" (much less than N) is the number of particles in a fiducial region. Many features of our J_{E_T} jets are similar to anti-k_t jets, including the reconstructed jet momentum and the "back-reaction" from soft contamination. Nevertheless, when the jet parameters in the two algorithms are matched using QCD jets, we find that the J_{E_T} algorithm has a larger efficiency than anti-k_t for identifying objects with hard splittings such as a W-jet.

Yang Bai; Zhenyu Han; Ran Lu

2014-11-13T23:59:59.000Z

135

Jets from accretion discs  

Science Journals Connector (OSTI)

...been implicated in jet collimation. A particularly instruc...prototypical disc/jet system HH 30 (Burrows et al...some form of intrinsic collimation, since external density...of intrinsic magnetic collimation. There now exist measurements...from the most embedded systems, the class zero objects...

2000-01-01T23:59:59.000Z

136

In-line ultrasonic monitoring of waste slurry suspended solids  

SciTech Connect

During the transport of tank waste, it is very important to quantitatively measure the percent solids concentration (PSC) of the waste, which indicates the flow conditions and the extent of solids settling. At Argonne National Laboratory, an in-line, real-time, a nonintrusive ultrasonic monitoring system has been developed to measure the PSC and flow density of tank waste by measuring sound velocity and attenuation in the flow. This system consists of a pair of longitudinal transducers bonded to waveguides on the opposite sides of the pipe and operating at IMHz simultaneously in pulse-and-echo and pitch-and-catch modes. The PSC measurement is provided by attenuation, while the density measurement is calculated by impedance and sound velocity. A thermocouple is attached to one of the waveguides for automatic temperature correction of the measurements. This system was one of four evaluated for in-line measurement of slurry at Oak Ridge National Laboratory in 1998. The results indicate that the measurements are in good agreement with a Coriolis meter and that the system can be used to monitor PSC up to 40 wt.%. However, the system is greatly affected by entrained air bubbles within the solid flow during Puisair mixing. A different mixing mechanism will solve this problem.

Chien, H.-T.; Sheen, S.-H.; Raptis, A. C.

2000-05-25T23:59:59.000Z

137

Coal slurry combustion optimization on single cylinder engine  

SciTech Connect

Under the sponsorship of the US Department of Energy, Morgantown Energy Technology Center, GE Transportation System has been conducting a proof of concept program to use coal water slurry (CWS) fuel to power a diesel engine locomotive since 1988. As reported earlier [1], a high pressure electronically controlled accumulator injector using a diamond compact insert nozzle was developed for this project. The improved reliability and durability of this new FIE allowed for an improved and more thorough study of combustion of CWS fuel in a diesel engine. It was decided to include a diesel pilot fuel injector in the combustion system mainly due to engine start and low load operation needs. BKM, Inc. of San Diego, CA was contracted to develop the electronic diesel fuel pilot/starting FIE for the research engine. As a result, the experimental combustion study was very much facilitated due to the ability of changing pilot/CWS injection timings and quantities without having to stop the engine. Other parameters studied included combustion chamber configuration (by changing CWS fuel injector nozzle hole number/shape/angle), as well as injection pressure. The initial phase of this combustion study is now complete. The results have been adopted into the design of a 12 cylinder engine FIE, to be tested in 1992. This paper summarizes the main findings of this study.

Not Available

1992-09-01T23:59:59.000Z

138

Rules governing the classification of coal slurries for filtering centrifuges  

SciTech Connect

The feasibility of using filtering centrifuges for the cleaning of a coking-coal slurry is confirmed in principle, and regime operating parameters which ensure the production of a concentrate of conditioned quality are determined on the basis of results of experimental-industrial tests of a new procedure for this operation at the Neryungrinskaya Concentrating Mill. An equation is proposed for determination of solid carry-off in the centrifuge effluent, which completely satisfactorily (with a correlation coefficient of 0.7-0.8) describes the dependence of the parameter in question on the solid content in the centrifuge feed, and on its content of -0.2-mm material. It is noted that special investigations to determine the effect of the speed of the rotor and shape of the particles on the amount of solid carry-off in the centrifuge effluent are required for construction of a model describing the size reduction of solid-phase particles in the effluent during centrifuge filtration.

G.Y. Gol'berg; Y.B. Rubinshtein; S.A. Osadchii [Institute for Enrichment of Solid Fuel (IOTT), Moscow Oblast (Russian Federation)

2008-07-01T23:59:59.000Z

139

DEMONSTRATION OF MIXING AND TRANSFERRING SETTLING COHESIVE SLURRY SIMULANTS IN THE AY-102 TANK  

SciTech Connect

In support of Hanford's feed delivery of high level waste (HLW) to the Waste Treatment and Immobilization Plant (WTP), pilot-scale testing and demonstrations with simulants containing cohesive particles were performed as a joint collaboration between Savannah River National Laboratory (SRNL) and the Pacific Northwest National Laboratory (PNNL) staff. The objective of the demonstrations was to determine the impact that cohesive particle interactions in the simulants, and the resulting non-Newtonian rheology, have on tank mixing and batch transfer of large and dense seed particles. The work addressed the impacts cohesive simulants have on mixing and batch transfer performance in a pilot-scale system. Kaolin slurries with a range of wt% concentrations to vary the Bingham yield stress were used in all the non-Newtonian simulants. To study the effects of just increasing the liquid viscosity (no yield stress) on mixing and batch transfers, a glycerol/water mixture was used. Stainless steel 100 micron particles were used as seed particles due to their density and their contrasting color to the kaolin and glycerol. In support of Hanford's waste certification and delivery of tank waste to the Waste Treatment and Immobilization Plant (WTP), Savannah River National Laboratory (SRNL) was tasked by Washington River Protection Solutions (WRPS) to evaluate the effectiveness of mixing and transferring tank waste in a Double Shell Tank (DST) to the WTP Receipt Tank. The work addresses the impacts cohesive simulants have on mixing and batch transfer performance. This work is follow-on to the previous tasks 'Demonstration of Mixer Jet Pump Rotational Sensitivity on Mixing and Transfers of the AY-102 Tank' and 'Demonstration of Simulated Waste Transfers from Tank AY-102 to the Hanford Waste Treatment Facility'. The cohesive simulants were investigated and selected jointly by SRNL and PNNL and a white paper was written on this evaluation. The testing and demonstrations of cohesive simulants was a joint effort performed as collaboration between SRNL and PNNL staff. The objective of the demonstrations was to determine the impact that cohesive particle interactions in the simulants have on tank mixing using the 1/22nd scale mixing system and batch transfer of seed particles. Seed particles are particles of contracting color added to mixing tank for visual inspection and an indicator of how well the contents of the tank are mixing. Also the seed particles serve as a measuring stick for how well the contents of the tank are transferred from the mixing tank during batch transfers. This testing is intended to provide supporting evidence to the assumption that Hanford Small Scale Mixing Demonstration (SSMD) testing in water is conservative.

Adamson, D.; Gauglitz, P.

2012-01-03T23:59:59.000Z

140

The influence of Streptococcus spp., Lactobacillus spp. and Pediococcus spp. on production of volatile sulfhydryl compounds in Cheddar cheese slurries  

E-Print Network (OSTI)

. There was a decrease in production of hydrogen sulfide, methanethiol, and dimethyl sulfide in slurries prepared from Cheddar cheese manufactured from pasteurized milk when compared to slurries prepared from Cheddar cheese manufactured from raw milk.... . 3. Standard curve for carbonyl sulfide. . 4. Standard curve for methanethiol. 32 33 34 5. Standard curve for dimethyl sulfide. . 35 6. Hydrogen sulfide production in Cheddar cheese slurries. . . . . . . . . . 37 7. ~~~ill spp. growth...

Dagerath, Michael Lynn

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Fluid dynamic studies for a simulated Melton Valley Storage Tank slurry  

SciTech Connect

The Melton Valley Storage Tanks (MVSTs), are used for the collection and storage of remote-handled radioactive liquid wastes. These wastes, which were typically acidic when generated, were neutralized with the addition of sodium hydroxide to protect the storage tanks from corrosion, but this caused the transuranic and heavy metals to precipitate. These wastes will eventually need to be removed from the tanks for ultimate disposal. The objective of the research activities discussed in this report is to support the design of a pipeline transport system between the MVSTs and a treatment facility. Since the wastes in the MVSTs are highly radioactive, a surrogate slurry was developed for this study. Rheological properties of the simulated slurry were determined in a test loop in which the slurry was circulated through three pipeline viscometers of different diameters. Pressure drop data at varying flow rates were used to obtain shear stress and shear rate data. The data were analyzed, and the slurry rheological properties were analyzed by the Power Law model and the Bingham plastic model. The plastic viscosity and yield stress data obtained from the rheological tests were used as inputs for a piping design software package, and the pressure drops predicted by the software compared well with the pressure drop data obtained from the test loop. The minimum transport velocity was determine for the slurry by adding known nominal sizes of glass spheres to the slurry. However, it was shown that the surrogate slurry exhibited hindered settling, which may substantially decrease the minimum transport velocity. Therefore, it may be desired to perform additional tests with a surrogate with a lower concentration of suspended solids to determine the minimum transport velocity.

Hylton, T.D.; Youngblood, E.L.; Cummins, R.L.

1994-07-01T23:59:59.000Z

142

Rapid Coal Analysis. Part I: Particle Size Effects in Slurry Methods Based on Flame AA and Swing-Mill Grinding  

Science Journals Connector (OSTI)

Laser diffraction particle size measurements are used to study aerodynamic mass transport losses of a finely ground aqueous coal slurry aerosol in the spray chamber of a conventional...

Mohamed, N; McCurdy, D L; Wichman, M D; Fry, R C; O'Reilly, James E

1985-01-01T23:59:59.000Z

143

Tin-wall hollow ceramic spheres from slurries. Final report  

SciTech Connect

The overall objective of this effort was to develop a process for economically fabricating thin-wall hollow ceramic spheres from conventional ceramic powders using dispersions. This process resulted in successful production of monosized spheres in the mm size range which were point contact bonded into foams. Thin-wall hollow ceramic spheres of small (one to five millimeter) diameter have novel applications as high-temperature insulation and light structural materials when bonded into monolithic foams. During Phase 1 of this program the objective as to develop a process for fabricating thin-wall hollow spheres from powder slurries using the coaxial nozzle fabrication method. Based on the success during Phase 1, Phase 2 was revised to emphasize the assessment of the potential structural and insulation applications for the spheres and modeling of the sphere formation process was initiated. As more understanding developed, it was clear that to achieve successful structural application, the spheres had to be bonded into monolithic foams and the effort was further expanded to include both bonding into structures and finite element mechanical modeling which became the basis of Phase 3. Successful bonding techniques and mechanical modeling resulted but thermal conductivities were higher than desired for insulating activities. In addition, considerable interest had been express by industry for the technology. Thus the final Phase 4 concentrated on methods to reduce thermal conductivity by a variety of techniques and technology transfer through individualized visits. This program resulted in three Ph.D. theses and 10 M.S. theses and they are listed in the appropriate technical sections.

Chapman, A.T.; Cochran, J.K.

1992-12-31T23:59:59.000Z

144

Dehydration of isobutanol to isobutene in a slurry reactor  

SciTech Connect

The April 1990 Alternative Fuels Proposal to the Department of Energy involved the development of new technology, based on the liquid phase process, for conversion of coal-derived synthesis gas to oxygenated hydrocarbon fuels, fuel additives, and fuel intermediates. The objective of this work was to develop a slurry reactor based process for the dehydration of isobutanol to isobutene. The isobutene can serve as a feedstock for the high octane oxygenated fuel additive methyl tertiary-butyl either (MTBE). Alumina catalysts were investigated because of their wide use as a dehydration catalyst. Four commercially available alumina catalysts (Catapal B, Versal B, Versal GH, and Al-3996R) were evaluated for both activity and selectivity to the branched olefin. All four catalysts demonstrated conversions greater than 80% at 290 C, while conversions of near 100% could be obtained at 330 C. The reaction favors low pressures and moderate to low space velocities. A yield of 0.90 mole isobutene per mole reacted isobutanol or better was obtained at conversions of 60--70% and higher. From 75 to 98% conversion, the four catalysts all provide isobutene yields ranging from 0.92 to 0.94 with the maximum occurring around 90% conversion. At low conversions, the concentration of diisobutyl ether becomes significant while the concentration of linear butenes is essentially a linear function of isobutanol conversion. Doping the catalyst with up to 0.8 wt % potassium showed a modest increase in isobutene selectivity; however, this increase was more than offset by a reduction in activity. Investigations using a mixed alcohols feed (consistent with isobutanol synthesis from syngas) demonstrated a small increase in the C4 iso-olefin selectivity over that observed for a pure isobutanol feed. 55 refs.

Latshaw, B.E.

1994-02-01T23:59:59.000Z

145

Angular Scaling In Jets  

SciTech Connect

We introduce a jet shape observable defined for an ensemble of jets in terms of two-particle angular correlations and a resolution parameter R. This quantity is infrared and collinear safe and can be interpreted as a scaling exponent for the angular distribution of mass inside the jet. For small R it is close to the value 2 as a consequence of the approximately scale invariant QCD dynamics. For large R it is sensitive to non-perturbative effects. We describe the use of this correlation function for tests of QCD, for studying underlying event and pile-up effects, and for tuning Monte Carlo event generators.

Jankowiak, Martin; Larkoski, Andrew J.; /SLAC

2012-02-17T23:59:59.000Z

146

Method and apparatus for jet-assisted drilling or cutting  

DOE Patents (OSTI)

An abrasive cutting or drilling system, apparatus and method, which includes an upstream supercritical fluid and/or liquid carrier fluid, abrasive particles, a nozzle and a gaseous or low-density supercritical fluid exhaust abrasive stream. The nozzle includes a throat section and, optionally, a converging inlet section, a divergent discharge section, and a feed section.

Summers, David Archibold; Woelk, Klaus Hubert; Oglesby, Kenneth Doyle; Galecki, Grzegorz

2013-07-02T23:59:59.000Z

147

Coal liquefaction process utilizing coal/CO.sub.2 slurry feedstream  

DOE Patents (OSTI)

A coal hydrogenation and liquefaction process in which particulate coal feed is pressurized to an intermediate pressure of at least 500 psig and slurried with CO.sub.2 liquid to provide a flowable coal/CO.sub.2 slurry feedstream, which is further pressurized to at least 1000 psig and fed into a catalytic reactor. The coal particle size is 50-375 mesh (U.S. Sieve Series) and provides 50-80 W % coal in the coal/CO.sub.2 slurry feedstream. Catalytic reaction conditions are maintained at 650.degree.-850.degree. F. temperature, 1000-4000 psig hydrogen partial pressure and coal feed rate of 10-100 lb coal/hr ft.sup.3 reactor volume to produce hydrocarbon gas and liquid products. The hydrogen and CO.sub.2 are recovered from the reactor effluent gaseous fraction, hydrogen is recycled to the catalytic reactor, and CO.sub.2 is liquefied and recycled to the coal slurrying step. If desired, two catalytic reaction stages close coupled together in series relation can be used. The process advantageously minimizes the recycle and processing of excess hydrocarbon liquid previously needed for slurrying the coal feed to the reactor(s).

Comolli, Alfred G. (Yardley, PA); McLean, Joseph B. (S. Somerville, NJ)

1989-01-01T23:59:59.000Z

148

Department of Mechanical and Nuclear Engineering Fall 2011 Torque and Axial Measurement Device for Soil Abrasion Testing  

E-Print Network (OSTI)

PENNSTATE Department of Mechanical and Nuclear Engineering Fall 2011 Torque and Axial Measurement Device for Soil Abrasion Testing Overview The Penn State Department of Energy and Mineral Engineering to completely re-design with five weeks left. This left minimal time for machining, assembly, testing

Demirel, Melik C.

149

Coal liquefaction process wherein jet fuel, diesel fuel and/or astm no. 2 fuel oil is recovered  

SciTech Connect

An improved process for the liquefaction of coal and similar solid carbonaceous materials wherein a hydrogen donor solvent or diluent derived from the solid carbonaceous material is used to form a slurry of the solid carbonaceous material and wherein the naphthenic components from the solvent or diluent fraction are separated and used as jet fuel components. The extraction increases the relative concentration of hydroaromatic (hydrogen donor) components and as a result reduces the gas yield during liquefaction and decreases hydrogen consumption during said liquefaction. The hydrogenation severity can be controlled to increase the yield of naphthenic components and hence the yield of jet fuel and in a preferred embodiment jet fuel yield is maximized while at the same time maintaining solvent balance.

Bauman, R.F.; Ryan, D.F.

1982-06-01T23:59:59.000Z

150

Jet and Photon Physics  

E-Print Network (OSTI)

Jet production in proton-proton collisions is one of the main phenomenological predictions of QCD. The ATLAS and CMS Collaborations have performed measurements of several jet observables at the LHC and compared their results to theoretical predictions and event generators. Useful physics input for the determination of the parton distribution functions and the strong coupling constant is provided. Photon production measurements represent another important test of QCD and show strong sensitivity to higher-order corrections.

Peruzzi, Marco

2014-01-01T23:59:59.000Z

151

Jet and photon physics  

E-Print Network (OSTI)

Jet production in proton-proton collisions is one of the main phenomenological predictions of QCD. The ATLAS and CMS Collaborations have performed measurements of several jet observables at the LHC and compared their results to theoretical predictions and event generators. Useful physics input for the determination of the parton distribution functions and the strong coupling constant is provided. Photon production measurements represent another important test of QCD and show strong sensitivity to higher-order corrections.

Marco Peruzzi; for the ATLAS; CMS Collaborations

2014-09-30T23:59:59.000Z

152

Ice Slurry Medical Protective Organ Cooling: Buying Surgeons and Emergency Responders More Time  

NLE Websites -- All DOE Office Websites (Extended Search)

Slurry Medical Protective Organ Cooling: Slurry Medical Protective Organ Cooling: Buying Surgeons and Emergency Responders More Time Prepared by Ken Kasza* (PhD) and Yue Wu* (PhD) *Argonne National Laboratory 10-9-09 yuewu@anl.gov; 630-252-7203 Surgical procedures are pushing the limits of technical excision and becoming less invasive through the development and use of laparoscopic procedures assisted by surgeon/machine robotic manipulations. There is an unmet need to protect critical organs and various tissue masses during the course of surgical manipulations. Multiple tissue sites and organ systems that require complex operative manipulations to cure disease are often exposed to ischemic, traumatic, and xenobiotic insults that can result in loss of function or life-threatening conditions. Ice slurry production and delivery equipment developed by

153

Coal slurry pump development: fossil energy annual summary, technical information report  

SciTech Connect

This is a twenty-four month program on Coal Slurry Pump Development being conducted for the Department of Energy, Division of Coal Conversion, under Contract DE-AC03-79ET14842. The program consists of two phases. In the first phase an experimental prototype of a two-stage, high-pressure, centrifugal slurry pump will be fabricated and assembled into a test unit. In the second phase the experimental pump will be delivered to a DOE field test facility for initial testing in hot oil and for subsequent testing in an actual coal-oil slurry environment. During the program, Rocketdyne will supply technical support and coordination on test facility interfact requirements and for testing of the experimental pump to evaluated hydraulic, mechanical, material and operational performance characteristics.

Wong, G.S.

1980-10-30T23:59:59.000Z

154

MEASUREMENT AND PREDICTION OF RADIOLYTIC HYDROGEN PRODUCTION IN DEFENSE WASTE PROCESSING SLURRIES AT SAVANNAH RIVER SITE  

SciTech Connect

This paper presents results of measurements and predictions of radiolytic hydrogen production rates from two actual process slurries in the Defense Waste Processing Facility (DWPF) at Savannah River Site (SRS). Hydrogen is a flammable gas and its production in nuclear facilities can be a safety hazard if not mitigated. Measurements were made in the Shielded Cells of Savannah River National Laboratory (SRNL) using a sample of Sludge Batch 3 (SB3) currently being processed by the DWPF. Predictions were made using published values for rates of radiolytic reactions producing H{sub 2} in aqueous solutions and the measured radionuclide and chemical compositions of the two slurries. The agreement between measured and predicted results for nine experiments ranged from complete agreement to 24% difference. This agreement indicates that if the composition of the slurry being processed is known, the rate of radiolytic hydrogen production can be reasonably estimated.

Bibler, N; John Pareizs, J; Terri Fellinger, T; Cj Bannochie, C

2007-01-10T23:59:59.000Z

155

Dioxin and trace metal emissions from combustion of carbonized RDF slurry fuels  

SciTech Connect

In 1994, the U.S. generated approximately 209 million tons of Municipal Solid Waste (MSW), with 61% landfilled, 24% recycled, and 15% processed through Municipal Waste Combustion (MWC). In order to divert a larger portion of this generated MSW from landfills, MWC will have to play a growing role in MSW disposal. However, recently promulgated New Source Performance Standards (NSPS) for MWC will add an additional financial burden, through mandated emission reductions and air pollution control technologies, to an already financially pressured MWC marketplace. In the past, Refuse Derived Fuel (RDF), a solid fuel produced from MSW, has been fired in industrial and coal boilers as an alternative means of MWC. While lower sulfur dioxide (SO{sub 2}) emissions provided the impetus, firing RDF in industrial and coal boilers frequently suffered from several disadvantages including increased solids handling, increased excess air requirements, increased air emissions, increased slag formation in the boiler, and higher fly ash resistivity. This paper summarizes the latest emissions and combustion tests with the carbonized RDF slurry fuel. With EnerTech`s SlurryCarb{trademark} process, a pumpable slurry of RDF is continuously pressurized with a pump to between 1200 and 2500 psi. The RDF slurry is pressurized above the saturated steam curve to maintain a liquid state when the slurry is heated to approximately 480-660{degrees}F. Slurry pressure and temperature then are maintained for less than 30 minutes in plug-flow reactors. At this temperature and pressure, oxygen functional groups in the molecular structure of the RDF are split off as carbon dioxide gas. This evolved carbon dioxide gas comprises a significant weight percentage of the feed RDF, but only a minimal percentage of the heating value.

Klosky, M. [EnerTech Environmental, Inc., Atlanta, GA (United States); Fisher, M. [American Plastics Council, Washington, DC (United States); Singhania, A. [American Plastics Council/Amoco Chemicals, Alpharetta, GA (United States)] [and others

1997-12-01T23:59:59.000Z

156

Direct coal liquefaction at HTI using dispersed slurry catalyst  

SciTech Connect

The US Department of Energy (DOE) Direct Coal Liquefaction effort, in which Hydrocarbon Technologies, Inc. (HTI) is a major participant, is an integral part of the effort to meet the US National Energy Strategy goal of relying more on indigenous sources of energy. This is also very applicable to the China situation where there is a need to use the abundant coal, and organic waste resources present in China to produce cost-effective fuels that will meet environmental goals of high efficiency with neutral consequences on air, water and ground status. Located at HTI`s Research and Development Center in Lawrenceville, New Jersey are several pilot scale continuous flow operating units to study, develop and demonstrate direct coal liquefaction and hydrocracking. These units include two two-stage, 50 Kg/day process evaluation units, one 3/4 ton/day process confirmation unit and a 5 ton/day process development unit. Each of these units are adaptable for operation as fluidized (ebullated) beds or fully backmixed slurry catalyst reactor units. These units are completely integrated to provide feed preparation and handling, preheating, reaction, vapor/liquid separation, on-line hydrotreating, product fractionation, bottoms recycling and solid removal. These units have not only been used in the processing of coal, but also in the upgrading of heavy oil, tar sand bitumen, shale oil, waste tires, plastics, lignin and other organic municipal and industrial wastes. HTI has developed an advanced direct liquefaction process, HTI Coal Process, that produces clean transportation fuels and chemicals at a US cost of less than $30/bbl., equivalent crude oil price, at a grass roots facility. This process is based on the use of an HTI iron based catalyst, GelCat, with backmixed reactors, a close-coupled hydrotreater and interstage gas/liquid separation. Coal conversion, distillate yields and product qualities are comparable to that seen with a supported catalyst reactor system. The process is continuous, isothermal and free of solids accumulation with all coal ranks tested. Under the auspices of the US DOE, HTI has developed multi-stage liquefaction processes based on both supported and dispersed catalysts. The supported catalyst configuration involves the use of a three-phase ebullated bed reactor in which the supported catalyst is maintained at a random (fluidization) stage by re-circulating a relatively large quantity of catalyst-gas-free process fluid collected from the top of the reactor.

Lee, L.K.; Comolli, A.G.; Popper, G.; Zhou, P.Z. [Hydrocarbon Technologies, Inc., Lawrenceville, NJ (United States)

1997-12-31T23:59:59.000Z

157

Rheological properties of water-coal slurries based on brown coal in the presence of sodium lignosulfonates and alkali  

SciTech Connect

The effect of the oxidized surface of brown coal on the structural and rheological properties of water-coal slurries was found. The kinetics of structure formation processes in water-coal slurries based on as-received and oxidized brown coal was studied. The effect of lignosulfonate and alkali additives on the samples of brown coal was considered.

D.P. Savitskii; A.S. Makarov; V.A. Zavgorodnii [National Academy of Sciences of Ukraine, Kiev (Ukraine). Dumanskii Institute of Colloid and Water Chemistry

2009-07-01T23:59:59.000Z

158

Effects of sintering additives on dispersion properties of Al2O3 slurry containing polyacrylic acid dispersant  

Science Journals Connector (OSTI)

The effects of sintering aid adsorption on the dispersion properties of aluminum oxide slurries were investigated. We considered Al2O3 slurry without additives and Al2O3 slurry with a Mg additive with 0.1 mass% in oxide equivalent as a sintering aid. In this study, we evaluated the adsorption isotherm of polyacrylic acid (PAA) onto Al2O3 and the dispersion degree of Al2O3 slurries in sedimentation tests under gravity. The adsorption isotherm featured a characteristic adsorption isothermal line with a maximum value when Mg additive was present in Al2O3. In addition, the packing fractions did not correspond to the apparent viscosity. However, in slurry that was allowed to settle for several days, both of them agreed.Therefore, the disagreement between the packing fraction and the apparent viscosity immediately after preparation arose from changes of the dispersion state, such as the decrease of the distance between particles with time.

Hiromi Ohtsuka; Hidetoshi Mizutani; Satoshi IIO; Kazuki Asai; Takayoshi Kiguchi; Hiroshi Satone; Takamasa Mori; Junichiro Tsubaki

2011-01-01T23:59:59.000Z

159

Top Jets at the LHC  

E-Print Network (OSTI)

Physics Signatures at the LHC,” talk presented at the 2007Top Jets at the LHC Leandro G. Almeida, Seung J. Lee, GiladSEPT-DPP Top Jets at the LHC Leandro G. Almeida a , Seung J.

Almeida, L.G.

2009-01-01T23:59:59.000Z

160

Multiple jet interactions  

E-Print Network (OSTI)

Type Designation Key Direction of Traverse: A - Axial R ? Radial A CON1 N (1) (3) (2) (2) Probe Type: N - Straight, a=O' S - Slant, a=45' (3) Configuration: CON1 CON2 CON3 CON4 CONS CON6 Jets h/D X/h 8 5. 0 16 2. 5 5. 33 7. 5 8 5. 0..., h/D=8. 0 and 2 Jets, h/D=8. 0. 0. 30 SYM INFORMATION: 8 RUN 24 RCON4N X/0 40 0. 25 oo 0. 20 0. 10 0. 05 0. 00 -0 4 -0 3 -0 2 -0. 1 0 0 0. 1 0 2 0 3 0 4 TyX Fig. 24 Distribution of Turbulence Intensity for 2 Jets, b/D=16. 0. 0. 30 BYN...

Hehr, Roger James

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Microwave applicator for in-drum processing of radioactive waste slurry  

DOE Patents (OSTI)

A microwave applicator for processing of radioactive waste slurry uses a waveguide network which splits an input microwave of TE.sub.10 rectangular mode to TE.sub.01 circular mode. A cylindrical body has four openings, each receiving 1/4 of the power input. The waveguide network includes a plurality of splitters to effect the 1/4 divisions of power.

White, Terry L. (Oak Ridge, TN)

1994-01-01T23:59:59.000Z

162

Acoustic Monitor for Liquid-Solid Slurries Measurements at Low Weight Fractions  

SciTech Connect

Our effort in this project is to develop an acoustic monitor for accurate, real-time characterization of the size and weight fractions of solids in slurries for process monitoring and to determine the optimal timing for slurry transfers. This capability will be valuable in the Savannah River Site accelerated clean-up program. Our scientific work during the first research period developed a theory, supported by experiments, to describe sound attenuation of solids in suspensions in the presence of bubbles, which permits us to determine the solid-liquid weight percent. Engineering developments during the second research period led to the design, construction, and demonstration, in our laboratories, of the Syracuse Acoustic Monitor (SAM) system that measures weight percent solids accurately in slurries of 0.5 to 8.0 weight percent on-line and in real-time. Also, we had shown the potential for these measurements in solid-gas-liquid slurries by removing the interference due to the presence of gas bubbles.

Taviarides, Lawrence L.

2005-06-01T23:59:59.000Z

163

Liquid CO{sub 2}/Coal Slurry for Feeding Low Rank Coal to Gasifiers  

SciTech Connect

This study investigates the practicality of using a liquid CO{sub 2}/coal slurry preparation and feed system for the E-Gas™ gasifier in an integrated gasification combined cycle (IGCC) electric power generation plant configuration. Liquid CO{sub 2} has several property differences from water that make it attractive for the coal slurries used in coal gasification-based power plants. First, the viscosity of liquid CO{sub 2} is much lower than water. This means it should take less energy to pump liquid CO{sub 2} through a pipe compared to water. This also means that a higher solids concentration can be fed to the gasifier, which should decrease the heat requirement needed to vaporize the slurry. Second, the heat of vaporization of liquid CO{sub 2} is about 80% lower than water. This means that less heat from the gasification reactions is needed to vaporize the slurry. This should result in less oxygen needed to achieve a given gasifier temperature. And third, the surface tension of liquid CO{sub 2} is about 2 orders of magnitude lower than water, which should result in finer atomization of the liquid CO{sub 2} slurry, faster reaction times between the oxygen and coal particles, and better carbon conversion at the same gasifier temperature. EPRI and others have recognized the potential that liquid CO{sub 2} has in improving the performance of an IGCC plant and have previously conducted systemslevel analyses to evaluate this concept. These past studies have shown that a significant increase in IGCC performance can be achieved with liquid CO{sub 2} over water with certain gasifiers. Although these previous analyses had produced some positive results, they were still based on various assumptions for liquid CO{sub 2}/coal slurry properties. This low-rank coal study extends the existing knowledge base to evaluate the liquid CO{sub 2}/coal slurry concept on an E-Gas™-based IGCC plant with full 90% CO{sub 2} capture. The overall objective is to determine if this technology could be used to reduce the cost and improve the efficiency of IGCC plants. The study goes beyond the systems-level analyses and initial lab work that formed the bases of previous studies and includes the following tasks: performing laboratory tests to quantify slurry properties; developing an engineering design of a liquid CO{sub 2} slurry preparation and feed system; conducting a full IGCC plant techno-economic analysis for Powder River Basin (PRB) coal and North Dakota lignite in both water and liquid CO{sub 2} slurries; and identifying a technology development plan to continue the due diligence to conduct a comprehensive evaluation of this technology. The initial task included rheology tests and slurry data analyses that would increase the knowledge and understanding of maximum solids loading capability for both PRB and lignite. Higher coal concentrations have been verified in liquid CO{sub 2} over water slurries, and a coal concentration of 75% by weight in liquid CO{sub 2} has been estimated to be achievable in a commercial application. In addition, lower slurry viscosities have been verified in liquid CO{sub 2} at the same solids loading, where the liquid CO{sub 2}/coal slurry viscosity has been measured to be about a factor of 10 lower than the comparable water slurry and estimated to be less than 100 centipoise in a commercial application. In the following task, an engineering design of a liquid CO{sub 2}/coal slurry preparation and mixing system has been developed for both a batch and continuous system. The capital cost of the design has also been estimated so that it could be used in the economic analysis. An industry search and survey has been conducted to determine if essential components required to construct the feed system are available from commercial sources or if targeted R&D efforts are required. The search and survey concluded that commercial sources are available for selected components that comprise both the batch and continuous type systems. During normal operation, the fuel exits the bottom of the coal silo and is fed to a rod mill fo

Marasigan, Jose; Goldstein, Harvey; Dooher, John

2013-09-30T23:59:59.000Z

164

Development and process evaluation of improved Fischer-Tropsch slurry catalysts. Final report  

SciTech Connect

This report describes results of a study aimed at developing and evaluating improved catalysts for a slurry Fischer-Tropsch (FT) process for converting synthesis gas to high quality transportation fuels (gasoline and distillate). The improvements in catalyst performance were sought by studying effects of pretreatment conditions, promoters and binders/supports. A total of 20 different, iron based, catalysts were evaluated in 58 fixed bed reactor tests and 10 slurry reactor tests. The major accomplishments and conclusions are summarized below. The pretreatment conditions (temperature, duration and the nature of reducing gas) have significant effect on catalyst performance (activity, selectivity and stability) during Fischer-Tropsch synthesis. One of precipitated unsupported catalysts had hydrocarbon selectivity similar to Mobil`s I-B catalyst in high wax mode operation, and had not experienced any loss in activity during 460 hours of testing under variable process conditions in a slurry reactor. The effect of promoters (copper and potassium) on catalyst performance during FT synthesis has been studied in a systematic way. It was found that potassium promotion increases activities of the FT and water-gas-shift (WGS) reactions, the average molecular weight of hydrocarbon products, and suppresses the olefin hydrogenation and isomerization reactions. The addition of binders/supports (silica or alumina) to precipitated Fe/Cu/K catalysts, decreased their activity but improved their stability and hydrocarbon selectivity. The performance of catalysts of this type was very promising and additional studies are recommended to evaluate their potential for use in commercial slurry reactors.

Bukur, D.B.; Mukesh, D.; Patel, S.A.; Zimmerman, W.H.; Rosynek, M.P. [Texas A& M Univ., College Station, TX (United States); Kellogg, L.J. [Air Products and Chemicals, Inc., Allentown, PA (United States)

1990-04-01T23:59:59.000Z

165

Evaluation of Protected Metal Hydride Slurries in a H2 Mini-  

E-Print Network (OSTI)

Evaluation of Protected Metal Hydride Slurries in a H2 Mini- Grid TIAX, LLC Acorn Park Cambridge_MERIT_REVIEW_MAY2003 2 Introduction Hydrogen Mini-Grid Concept Distributed FCPS utilizing a H2 Mini-Grid can provide waste heat can be used for hot water or space heating in buildings (i.e. "cogen") Distributed FCPS

166

Computational Modeling of Coal Water Slurry Combustion Processes in Industrial Heating Boiler  

Science Journals Connector (OSTI)

Coal water slurry (CWS) is typically composed of 60–70% coal, 30–40% water, and 1% chemical additives. It has been developed over the last 20 years as an alternative to fuel oil mainly in industrial and utility b...

L. J. Zhu; B. Q. Gu

2007-01-01T23:59:59.000Z

167

Organic vapor jet printing system  

SciTech Connect

An organic vapor jet printing system includes a pump for increasing the pressure of an organic flux.

Forrest, Stephen R

2012-10-23T23:59:59.000Z

168

Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. I. microstructure and composition of ZrB2-containing coatings  

Science Journals Connector (OSTI)

To improve the abrasive wear resistance of titanium alloys, ZrB2-containing protective coatings are deposited by electrospark alloying (ESA). As electrode materials, composite ceramics with different amounts of Z...

I. A. Podchernyaeva; A. D. Panasyuk…

2009-05-01T23:59:59.000Z

169

Innovative process for concentration of fine particle coal slurries. Technical report, March 1- May 31, 1996  

SciTech Connect

Williams Technologies, Inc. And Clarke Rajchel Engineering are developing a technology (patent pending) to produce high quality coal water slurries from preparation plant fine coal streams. The WTI/CRE technology uses the novel implementation of high-shear cross-flow separation which replaces and enhances conventional thickening processes by surpassing normally achievable solids loadings. Dilute ultra-fine (minus 100 mesh) solids slurries can be, concentrated to greater than 60 weight percent and re-mixed, as required, with de-watered coarser fractions to produce pumpable, heavily loaded coal slurries. The permeate (filtrate) resulting from this process has been demonstrated to be crystal clear and totally free of suspended solids. The primary objective of this project was to demonstrate the WTI/CRE coal slurry production process technology at the pilot scale. The technology can enable Illinois coal producers and users to realize significant cost and environmental benefits both by eliminating fine coal waste disposal problems and producing an IGCC fuel to produce power which meets all foreseeable clean air standards. Testing was also directed at concentrating mine tailings material to produce a tailings paste which can be mine-back-filled, eliminating the need for tailings ponds. During the grant period, a laboratory-scale test apparatus (up to 3 GPM feed rate) was assembled and operated to demonstrate process performance over a range of feed temperatures and pressures. A dilute coal/water slurry from Consol, Inc.`s Rend Lake Preparation Plant was concentrated using the process to a maximum recorded solids loading of 61.9% solids by weight. Analytical results from the concentrate were evaluated by Destec Energy for suitability as an IGCC fuel.

Rajchel, M.; Ehrlinger, H.P.; Fonseca, A.; Mauer, R.

1996-12-31T23:59:59.000Z

170

Gasoline Jet Fuels  

E-Print Network (OSTI)

C4n= Diesel Gasoline Jet Fuels C O C5: Xylose C6 Fermentation of sugars Biofuel "Nanobowls" are inorganic catalysts that could provide the selectivity for converting sugars to fuels IACT Proposes Synthetic, Inorganic Catalysts to Produce Biofuels Current Process

Kemner, Ken

171

Jets from accretion discs  

Science Journals Connector (OSTI)

...associ- ation with relativistic processes and accretion discs in the...laboratory in which to study these processes on shorter time-scales in...astrophysics. Proc. 12th Kingston Mtg (ed. D. A. Clarke & M...astrophysical jets. II. Dynamical processes in the accretion of magnetized...

2000-01-01T23:59:59.000Z

172

Downhole jet pump  

SciTech Connect

This patient describes a well equipped to produce oil at the surface from a subterranean formation including: a casing string cemented in a well bore penetrating the earth to a depth below the formation, the casing string comprising perforations extending through the casing string into communication with the formation; a packer sealed against the interior of the casing string above the formation; a tubing string inside the casing string and providing therewith an annulus, the tubing string being connected to the packer and extending upwardly to the surface, the tubing string and annulus providing a first upward path to the surface and a second downward fluid path from the surface; and a jet pump assembly including a jet pump below the packer comprising a body having an upper end, an outlet in communicating with the first fluid path, a nozzle section having a suction inlet below the packer and a power fluid inlet, means providing communication between the second fluid path and the nozzle section for delivering power fluid to the power fluid inlet and means connecting the upper jet pump body end to the tubing string comprising as J-slot receptacle secured to the upper jet pump body end having a J-slot therein, a tubular member connected with and communicating with the tubing string and having a J-slot pin on the lower end thereof removably received in the J-slot and means sealing between the J-slot receptacle and J-slot pin.

Weeks, B.R.

1988-12-13T23:59:59.000Z

173

Abrasive wear by diesel engine coal-fuel and related particles  

SciTech Connect

The purpose of the work summarized in this report was to obtain a basic understanding of the factors which are responsible for wear of the piston ring and cylinder wall surfaces in diesel engines utilizing coal-fuel. The approach included analytical studies using scanning electron microscopy and energy dispersive x-ray analyses to characterize coal-fuel and various combustion particles, and two different wear tests. The wear tests were a modified pin-on-disk test and a block-on-ring test capable of either unidirectional or reciprocating-rotational sliding. The wear tests in general were conducted with mixtures of the particles and lubricating oil. The particles studied included coal-fuel, particles resulting from the combustion of coal fuel, mineral matter extracted during the processing of coal, and several other common abrasive particle types among which quartz was the most extensively examined. The variables studied included those associated with the particles, such as particle type, size, and hardness; variables related to contact conditions and the surrounding environment; and variables related to the type and properties of the test specimen materials.

Ives, L.K. [National Inst. of Standards and Technology, Gaithersburg, MD (United States)

1994-09-01T23:59:59.000Z

174

Theoretical development and validation of a Sharp Front model of the dewatering of a slurry by an absorbent substrate  

Science Journals Connector (OSTI)

The absorption of water from a slurry into an absorbent substrate is analysed using Sharp Front theory. The analysis describes the relationship between the sorptivity S of the substrate, the desorptivity R of the slurry and the transfer sorptivity A between slurry and substrate, and leads to the relationship 1/A2 = 1/R2 + 1/S2. Experimental data are presented which validate this equation for the practically important case of the absorption of water from soft mortar mixes by fired clay bricks. A unique feature of the experimental work is the measurement of the desorptivity of the mortars at a pressure equal to the wetting front capillary pressure of the clay brick substrate. Analysis of the experimental data also enables, for the first time, the calculation of the capillary potential at the slurry/substrate interface. The analysis has relevance to many aspects of ceramic and mineral processing, industrial filtration and construction engineering.

N C Collier; M A Wilson; M A Carter; W D Hoff; Christopher Hall; R J Ball; A El-Turki; G C Allen

2007-01-01T23:59:59.000Z

175

Characterization of coal-water slurry fuel sprays generated by an electronically-controlled accumulator fuel injector.  

E-Print Network (OSTI)

??Experiments have been completed to characterize coal-water slurry sprays generated by an electronically-controlled accumulator fuel injection system for a diesel engine. The sprays were injected… (more)

Payne, Stephen Ellis

2012-01-01T23:59:59.000Z

176

Characterization of coal-water slurry fuel sprays generated by an electronically-controlled accumulator fuel injector  

E-Print Network (OSTI)

Experiments have been completed to characterize coal-water slurry sprays generated by an electronically-controlled accumulator fuel injection system for a diesel engine. The sprays were injected into a pressurized chamber equipped with quartz...

Payne, Stephen Ellis

2012-06-07T23:59:59.000Z

177

A study of ignition and combustion characteristics of isolated coal water slurry droplet using digital image processing technique  

E-Print Network (OSTI)

at constant pressure Coal water slurry Diffusion coefficient (Damkohler number) Activation energy Higher heating value Gasification rate constant Flame lift off distance Mass of CWS drop Number of coal particles in a single CWS drop Prandtl number... of gasification and combustion of liquid and coal. This is due to the fact that basic combustion theories apply to both processes with some differences to compensate for the difference in the ignition and combustion characteristics of a liquid drop and slurry...

Bhadra, Tanmoy

2012-06-07T23:59:59.000Z

178

Modified shielding jet model for twin-jet shielding analysis  

E-Print Network (OSTI)

the slowing of the jet flow due to turbulent mixing and entrainment of particles from the surrounding medium. The empirical formulations and velocity profiles derived for the respective regions of the jet consider this increase in entrained fluid... velocity profiles are integrated over their respective cross sections of the shielding jet to determine the total volumetric flowrate at the specified locations. A slug flow velocity approximation is then determined for each of the desired downstream...

Gilbride, Jennifer Frances

2012-06-07T23:59:59.000Z

179

High-pressure jet cutters improve capping operations  

SciTech Connect

Advances in abrasive cutting technology have improved the methods for removing damaged equipment and preparing wellheads for capping. This technology, much of which was refined during well control operations in Kuwait in 1991, can improve the safety and efficiency of capping jobs by cutting wellheads or casing quickly and cleanly. The majority of well control jobs involve one of three types of capping operations: capping to a flange, capping by installing a wellhead, or capping to a casing stub. Capping operations are often the first major step in regaining control of the well during blowout intervention. Proper planning of a capping operation must take into account the mass flow rate, combustible nature of the flow, well bore geometry, and operations in the post-capping phase of the project. The paper discusses capping vehicles, tree removal, jet cutters, capping to a flange, capping to a stub, swallowing the stub, spin-on technique, capping on fire, stinging, offshore blowouts, firefighting, pollution control, intervention equipment, and rig removal.

Abel, L.W.; Campbell, P.J.; Bowden, J.R. Sr. [Wild Well Control Inc., Spring, TX (United States)

1995-05-08T23:59:59.000Z

180

NETL: Gasification Systems - Liquid Carbon Dioxide/Coal Slurry for Feeding  

NLE Websites -- All DOE Office Websites (Extended Search)

Feed Systems Feed Systems Liquid Carbon Dioxide/Coal Slurry for Feeding Low-Rank Coal to Gasifiers Project Number: DE-FE0007977 There is increased interest in carbon capture and storage (CCS) for future coal-based power plants, and in a CCS integrated gasification plant, relatively pure, high pressure CO2 stream(s) will be available within the power plant. Electric Power Research Institute (EPRI) aims to help reduce the cost and improve the efficiency of integrated gasification combined cycle (IGCC) with CCS by using a portion of the high purity CO2 product stream as the carrier fluid to feed low rank coal (LRC) into the gasifier. EPRI proposes to confirm the potential advantages of LRC/liquid carbon dioxide (LCO2) slurries by: Conducting plant-wide technical and economic simulations.

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Process for coal liquefaction by separation of entrained gases from slurry exiting staged dissolvers  

DOE Patents (OSTI)

There is described an improved liquefaction process by which coal is converted to a low ash and low sulfur carbonaceous material that can be used as a fuel in an environmentally acceptable manner without costly gas scrubbing equipment. In the process, coal is slurried with a solvent, passed through a preheater and at least two dissolvers in series in the presence of hydrogen-rich gases at elevated temperatures and pressures. Solids, including mineral ash and unconverted coal macerals are separated from the condensed dissolver effluent. In accordance with the improved process, fresh hydrogen is fed to each dissolver and the entrained gas from each dissolver is separated from the slurry phase and removed from the reactor system before the condensed phase is passed to the next dissolver in the series. In accordance with another process, the feeds to the dissolvers are such that the top of each downstream dissolver is used as a gas-liquid separator.

Givens, Edwin N. (Bethlehem, PA); Ying, David H. S. (Macungie, PA)

1983-01-01T23:59:59.000Z

182

Roles of inherent mineral matters for lignite water slurry electrolysis in H2SO4 system  

Science Journals Connector (OSTI)

Abstract To understand roles of inherent mineral matters in lignite water slurry (LWS) electrolysis, lignite and demineralized lignite electrolyses were carried out in H2SO4 system. The results showed that cell voltage for LWS electrolysis was lower than that for demineralized lignite water slurry (DLWS) under constant current condition. Some inherent mineral matters changed into the corresponding metal ions which entered into electrolyte, and thus improved the electrolysis oxidation reactions for coal organic structure. Meanwhile, the relative amount of O-containing functional groups in demineralized lignite increased with electrolysis time, improving its pyrolysis reactivity. However, the pyrolysis reactivity of raw lignite decreased due to the removal of the inherent mineral matters from electrolysis.

Xuzhong Gong; Mingyong Wang; Zhi Wang; ZhanCheng Guo

2013-01-01T23:59:59.000Z

183

Recent developments in freeform fabrication of dense ceramics from slurry deposition  

SciTech Connect

A freeform fabrication technique for dense ceramics and composites has been developed. The technique requires less than 2 volume percent of organic additives and relies on the principle of layerwise deposition of highly loaded colloidal slurries. Components can be manufactured into complex geometries with thick solid sections as well as with thin-walled sections with high aspect ratios. Process feasibility and quality is dependent on the processing parameters of solids loading, slurry rheology, deposition rate, and drying rate. These interrelated parameters must be controlled so that sintering defects are prevented and shape tolerance is maintained. A review of this freeform fabrication technique, called robocasting, will be discussed for fabrication of aluminum oxide parts. Recent developments for a finite element analysis technique for modeling the drying process will also be presented.

Cesarano, J. III; Baer, T.A. [Sandia National Labs., Albuquerque, NM (United States); Calvert, P. [Univ. of Arizona, Tucson, AZ (United States)

1997-11-01T23:59:59.000Z

184

V+jets production at the CMS  

E-Print Network (OSTI)

Measurements of Vector Boson production in association with jets are presented, using p-p collision data at sqrt{s} = 7 TeV. The measurements presented include Z + jets azimuthal correlations, event shapes, vector boson + jets differential cross section measurements, hard double-parton scattering using W + jets events and electroweak Z + forward - backward jet production.

B. Bilin; for the CMS Collaboration

2014-10-22T23:59:59.000Z

185

Centrifugal slurry pump wear and hydraulic studies. Quarterly technical progress report, January 1, 1987--March 31, 1987  

SciTech Connect

The following report marks the third quarter of the third phase of the centrifugal slurry pump improvement program. The program was begun in 1982 for the purpose of improving the operating life of centrifugal slurry pumps for coal liquefaction service. This phase of work will verify the design of a pump at higher speed operation. Eventual scale-up of the prototype slurry pumps to full-scale synthetic fuel generation plants could require ten times the flow. The higher speed will allow pumps to be smaller with respectable efficiencies. Conversely, without increasing the specific speed of the pump design, the eventual size would be more than triple that of the prototype slurry pump. The prototype slurry pump during this phase of the program incorporated all the features proven in the earlier phases of the program. This new, higher specific speed pump will be tested for the ability of the hydraulic design to inhibit wear. It will be tested and compared to the previous optimum prototype slurry pump of this program.

Bonney, G.E. [Ingersoll-Rand Co., Phillipsburg, NJ (United States)

1987-01-01T23:59:59.000Z

186

Cryogenic fractionator gas as stripping gas of fines slurry in a coking and gasification process  

DOE Patents (OSTI)

In an integrated coking and gasification process wherein a stream of fluidized solids is passed from a fluidized bed coking zone to a second fluidized bed and wherein entrained solid fines are recovered by a scrubbing process and wherein the resulting solids-liquid slurry is stripped with a stripping gas to remove acidic gases, at least a portion of the stripping gas comprises a gas comprising hydrogen, nitrogen and methane separated from the coker products.

DeGeorge, Charles W. (Chester, NJ)

1981-01-01T23:59:59.000Z

187

The effects of glutathione on the production of free fatty acids in Cheddar cheese slurries  

E-Print Network (OSTI)

THE EFFECTS OF GLUTATHIONE ON THE PRUDUCTIUN OF FREE FATTY ACIDS IN CHEDDAR CHEESE SLURRIFS A Thesis by JANE MARGUERITE BROUSSARD Submitted to the Graduate College of Texas AAM University in partial fulfillment of the requirements... for the degree MASTER OF SCIENCE May 1986 Major Subuect: Food Science and Technology THE EFFECTS UF GLUTATHIONE ON THE PRODUCTION OF FREE FATTY ACIDS IN CHEDDAR CHEESE SLURRIES A Thesis by JANE MARGUERITE HROUSSARD Approved as to style and content...

Broussard, Jane Marguerite

2012-06-07T23:59:59.000Z

188

Innovative process for concentration of fine particle coal slurries. Technical report, September 1--November 30, 1995  

SciTech Connect

Williams Technologies, Inc. and Clarke Rajchel Engineering are developing a technology (patent pending) to produce high quality coal water slurries from preparation plant fine coal streams. The WTI/CRE technology uses the novel implementation of high-shear cross-flow separation which replaces and enhances conventional thickening processes by surpassing normally achievable solids loadings. Dilute ultra-fine (minus 100 mesh) solids slurries can be concentrated to greater than 60 weight percent and re-mixed, as required, with de-watered coarser fractions to produce pumpable, heavily loaded coal slurries. The permeate (filtrate) resulting from this process has been demonstrated to be crystal clear and totally free of suspended solids. The primary objective of this project is to demonstrate the WTI/CRE coal slurry production process technology at the pilot scale. The technology will enable Illinois coal producers and users to realize significant coast and environmental benefits both by eliminating fine coal waste disposal problems and producing an IGCC fuel to produce power which meets all foreseeable clean air standards. In addition, testing is also directed at concentrating mine tailings material to produce a tailings paste which can be mine-back-, filled and thus eliminate the need for tailings ponds. This reporting period, September 1, 1995 through November 30, 1995, marked the inception of this project. During this period Task No. 1, Procurement and Set-Up, was completed. The pilot plant apparatus was constructed at the SIU Coal Research Center in Carterville, Illinois. All equipment and feedstock were received at the site.

Rajchel, M. [Williams Technologies, Inc. (United States)]|[Clarke Rajchel Engineering, Arvada, CO (United States); Harnett, D. [Williams Technologies, Inc. (United States); Fonseca, A. [CONSOL, Pittsburgh, PA (United States); Maurer, R. [Destec (United States); Ehrlinger, H.P.

1995-12-31T23:59:59.000Z

189

Characterization of coal water slurry sprays from a positive displacement fuel injection system  

E-Print Network (OSTI)

, the cone angle increases and the penetration rate decreases. They also observed that the penetration rate was not strongly affected by concentration for slurries with loadings of upto 30% by weight. Benson et al. [10] reported results on a continous... of Rack Positions 72 84 SUMMARY . 89 CONCLUSIONS. 94 RECOMMENDATIONS. 96 REFERENCES. 98 APPENDIX A: NOMENCLATURE LIST 102 APPENDIX B: TABLES OF TEST CASES. . 104 APPENDIX C: CWS PENETRATION RESULTS BASED ON PRESSURES. 107 APPENDIX D: DIESEL...

Kumar Seshadri, Ajoy

2012-06-07T23:59:59.000Z

190

Microwave applicator for in-drum processing of radioactive waste slurry  

DOE Patents (OSTI)

A microwave applicator for processing of radioactive waste slurry uses a waveguide network which splits an input microwave of TE[sub 10] rectangular mode to TE[sub 01] circular mode. A cylindrical body has four openings, each receiving 1/4 of the power input. The waveguide network includes a plurality of splitters to effect the 1/4 divisions of power. 4 figures.

White, T.L.

1994-06-28T23:59:59.000Z

191

Conditions of utilization of coal mining and processing sludges as slurry fuel  

SciTech Connect

The results of this study have shown that coal sludge can be used as slurry fuel (like coal-water fuel (CWF)) providing that its ash content does not exceed 30% and the amount in the fuel is at least 55%. The conventional CWF preparation technologies are inapplicable to the fabrication of water-sludge fuel; therefore, special technologies with allowance for the ash content, the particle size, and the water content of coal sludge are demanded.

E.G. Gorlov; A.I. Seregin; G.S. Khodakov [Institute for Fossil Fuels, Moscow (Russian Federation)

2007-12-15T23:59:59.000Z

192

Correlations to predict frictional pressure loss of hydraulic-fracturing slurry in coiled tubing  

SciTech Connect

Compared with conventional-tubing fracturing, coiled-tubing (CT) fracturing has several advantages. CT fracturing has become an effective stimulation technique for multizone oil and gas wells. It is also an attractive production-enhancement method for multiseam coalbed-methane wells, and wells with bypassed zones. The excessive frictional pressure loss through CT has been a concern in fracturing. The small diameter of the string limits the cross-sectional area open to flow. Furthermore, the tubing curvature causes secondary flow and results in extra flow resistance. This increased frictional pressure loss results in high surface pumping pressure. The maximum possible pump rate and sand concentration, therefore, have to be reduced. To design a CT fracturing job properly, it is essential to predict the frictional pressure loss through the tubing accurately. This paper presents correlations for the prediction of frictional pressure loss of fracturing slurries in straight tubing and CT. They are developed on the basis of full-scale slurry-flow tests with 11/2-in. CT and slurries prepared with 35 lbm/1,000 gal of guar gel. The extensive experiments were conducted at the full-scale CT-flow test facility. The proposed correlations have been verified with the experimental data and actual field CT-fracturing data. Case studies of wells recently fractured are provided to demonstrate the application of the correlations. The correlations will be useful to the CT engineers in their hydraulics design calculations.

Shah, S.; Zhoi, Y.X.; Bailey, M.; Hernandez, J. [University of Oklahoma, Norman, OK (United States)

2009-08-15T23:59:59.000Z

193

BNL experiment with gas jet  

NLE Websites -- All DOE Office Websites (Extended Search)

project: Study of Hot Electron Transport and Subsequent Ion Acceleration using Overdense Gas Jet Target and Ultrafast TW CO2 Laser System Vitaly Yakimenko, Igor Pogorelsky ATF,...

194

Jet Charge at the LHC  

Science Journals Connector (OSTI)

Knowing the charge of the parton initiating a light-quark jet could be extremely useful both for testing aspects of the standard model and for characterizing potential beyond-the-standard-model signals. We show that despite the complications of hadronization and out-of-jet radiation such as pileup, a weighted sum of the charges of a jet’s constituents can be used at the LHC to distinguish among jets with different charges. Potential applications include measuring electroweak quantum numbers of hadronically decaying resonances or supersymmetric particles, as well as standard model tests, such as jet charge in dijet events or in hadronically decaying W bosons in tt¯ events. We develop a systematically improvable method to calculate moments of these charge distributions by combining multihadron fragmentation functions with perturbative jet functions and pertubative evolution equations. We show that the dependence on energy and jet size for the average and width of the jet charge can be calculated despite the large experimental uncertainty on fragmentation functions. These calculations can provide a validation tool for data independent of Monte Carlo fragmentation models.

David Krohn; Matthew D. Schwartz; Tongyan Lin; Wouter J. Waalewijn

2013-05-21T23:59:59.000Z

195

Plasma jets key to enduring solar mystery  

Science Journals Connector (OSTI)

... a few million degrees? The answer, researchers say, might lie in hot jets of plasma erupting from the Sun's surface. ... erupting from the Sun's surface. Plasma jets have also been considered as a possible heating mechanism. These jets are known ...

Jon Cartwright

2011-01-06T23:59:59.000Z

196

The Dynamics of Baroclinic Zonal Jets  

Science Journals Connector (OSTI)

Multiple alternating zonal jets are a ubiquitous feature of planetary atmospheres and oceans. However, most studies to date have focused on the special case of barotropic jets. Here we investigate the dynamics of freely evolving baroclinic jets, ...

Paul D. Williams; Christopher W. Kelsall

197

Sustainable Alternative Jet Fuels | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Sustainable Alternative Jet Fuels Sustainable Alternative Jet Fuels Nate Brown, Federal Aviation Administration, presentation at the Industry Roundtable on Update on ASTM Approval....

198

The effect of heat, cysteine, glutathione, and [gamma]-glutamyl transpeptidase on the production of volatile sulfhdryl compounds in cheddar cheese slurries  

E-Print Network (OSTI)

Table Page Al. Concentration of hydrogen sulfide in control slurries prepared from raw milk Cheddar cheese curd. 85 A2. Concentration of carbonyl sulfide in control slurries prepared from raw milk Cheddar cheese curd. 86 A3 Concentration...-glutamyl transpeptidase. . . . 127 A44. Concentration of dimethyl sulfide in 75 C heated milk Cheddar cheese slurries with added glutathione and V-glutamyl transpeptidase. . . . . . 128 A45. pH changes in raw milk Cheddar cheese slurries. 129 A46 pH changes...

Staff, Cynthia Ann

1991-01-01T23:59:59.000Z

199

Mercury Jet Studies Tristan Davenne  

E-Print Network (OSTI)

Mercury Jet Studies Tristan Davenne Rutherford Appleton Laboratory Joint UKNF, INO, UKIERI meeting mercury target and reported a radial velocity at surface of mercury jet due to proton beam is 36m/s #12;Numerical simulation of Sievers & Pugnat Result Click on image above to watch video of 2cm mercury target

McDonald, Kirk

200

OPENING ANGLES OF COLLAPSAR JETS  

SciTech Connect

We investigate the jet propagation and breakout from the stellar progenitor for gamma-ray burst (GRB) collapsars by performing two-dimensional relativistic hydrodynamic simulations and analytical modeling. We find that the jet opening angle is given by ?{sub j} ? 1/5?{sub 0} and infer the initial Lorentz factor of the jet at the central engine, ?{sub 0}, is a few for existing observations of ?{sub j}. The jet keeps the Lorentz factor low inside the star by converging cylindrically via collimation shocks under the cocoon pressure and accelerates at jet breakout before the free expansion to a hollow-cone structure. In this new picture, the GRB duration is determined by the sound crossing time of the cocoon, after which the opening angle widens, reducing the apparent luminosity. Some bursts violating the maximum opening angle ?{sub j,{sub max}} ? 1/5 ? 12° imply the existence of a baryon-rich sheath or a long-acting jet. We can explain the slopes in both Amati and Yonetoku spectral relations using an off-centered photosphere model, if we make only one assumption that the total jet luminosity is proportional to the initial Lorentz factor of the jet. We also numerically calibrate the pre-breakout model (Bromberg et al.) for later use.

Mizuta, Akira; Ioka, Kunihito [Theory Center, Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801 (Japan)

2013-11-10T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

CX-000663: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

663: Categorical Exclusion Determination 663: Categorical Exclusion Determination CX-000663: Categorical Exclusion Determination Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To Efficiently Exploit Enhanced Geothermal Systems CX(s) Applied: A9, B3.1, B3.6 Date: 02/09/2010 Location(s): Tulsa, Oklahoma Office(s): Energy Efficiency and Renewable Energy, Golden Field Office This project proposes to develop a cost-effective microhole drilling and completion technology with the Flash Abrasive Slurry Jet (ASJ) system and optimize it to maximize the efficiency of fluid circulation and heat removal for Enhanced Geothermal Systems (EGS). The proposed approach is expected to address the key obstacles that currently prevent EGS from becoming a technically feasible, commercially viable major contributor for

202

Integration of stripping of fines slurry in a coking and gasification process  

DOE Patents (OSTI)

In an integrated fluid coking and gasification process wherein a stream of fluidized solids is passed from a fluidized bed coking zone to a second fluidized bed and wherein entrained solid fines are recovered by a wet scrubbing process and wherein the resulting solids-liquid slurry is stripped to remove acidic gases, the stripped vapors of the stripping zone are sent to the gas cleanup stage of the gasification product gas. The improved stripping integration is particularly useful in the combination coal liquefaction process, fluid coking of bottoms of the coal liquefaction zone and gasification of the product coke.

DeGeorge, Charles W. (Chester, NJ)

1980-01-01T23:59:59.000Z

203

Micromachined chemical jet dispenser  

DOE Patents (OSTI)

A dispenser for chemical fluid samples that need to be precisely ejected in size, location, and time. The dispenser is a micro-electro-mechanical systems (MEMS) device fabricated in a bonded silicon wafer and a substrate, such as glass or silicon, using integrated circuit-like fabrication technology which is amenable to mass production. The dispensing is actuated by ultrasonic transducers that efficiently produce a pressure wave in capillaries that contain the chemicals. The 10-200 .mu.m diameter capillaries can be arranged to focus in one spot or may be arranged in a larger dense linear array (.about.200 capillaries). The dispenser is analogous to some ink jet print heads for computer printers but the fluid is not heated, thus not damaging certain samples. Major applications are in biological sample handling and in analytical chemical procedures such as environmental sample analysis, medical lab analysis, or molecular biology chemistry experiments.

Swierkowski, Steve P. (Livermore, CA)

1999-03-02T23:59:59.000Z

204

Entrained-flow dry-bottom gasification of high-ash coals in coal-water slurries  

SciTech Connect

It was shown that the effective use of dry ash removal during entrained-flow gasification of coal-water slurries consists in simplification of the ash storage system and utilization of coal ash, a decrease in the coal demand, a reduction in the atmospheric emissions of noxious substances and particulate matter, and abandonment of the discharge of water used for ash slurry. According to the results of gasification of coal-water slurries (5-10 {mu}m) in a pilot oxygen-blow unit at a carbon conversion of >91%, synthesis gas containing 28.5% CO, 32.5% H{sub 2}, 8.2% CO{sub 2}, 1.5% CH{sub 4}, the rest being nitrogen, was obtained. The fly ash in its chemical composition, particle size, and density meets the requirements of the European standard EN 450 as a cement additive for concrete manufacture.

E.G. Gorlov; V.G. Andrienko; K.B. Nefedov; S.V. Lutsenko; B.K. Nefedov [Institute for Fossil Fuels, Moscow (Russian Federation)

2009-04-15T23:59:59.000Z

205

Jets in heavy ion collisions with ATLAS  

E-Print Network (OSTI)

The energy loss of high-p_T partons provides insight into the transport properties of the medium created in relativistic heavy ion collisions. Evidence for this energy loss was first experimentally established through observation of high-p_T hadron suppression at RHIC. More recently, measurements of fully reconstructed jets have been performed at the LHC. In this summary the latest experimental results from the ATLAS collaboration on jet suppression are presented. In particular the jet suppression in inclusive jet yields, path length dependence of the jet suppression, photon-jet and Z^0-jet correlations, heavy flavor suppression, and jet fragmentation are discussed. These results establish qualitative features of the jet quenching mechanism as experimental fact and provide constraints on models of jet energy loss.

Martin Spousta; for the ATLAS Collaboration

2012-11-14T23:59:59.000Z

206

Latest jet results from the Tevatron  

SciTech Connect

A brief overview of the latest status of jet physics studies at the Tevatron in proton-antiproton collisions at {radical}s = 1.96 TeV is presented. In particular, measurements of the inclusive jet production cross-section, dijet production and searches for new physics, the ratio of the 3-jet to 2-jet production cross-sections, and the three-jet mass are discussed.

Price, Darren D.

2010-05-01T23:59:59.000Z

207

A theory for radial jet reattachment flow  

E-Print Network (OSTI)

, the velocity profile and mass entrainment are given accordrng to Goertler's t. wo- dimensional free jet theory. His analysrs of a free jet also assumes that. the turbulent eddy viscosity is constant ar ross the jet. (6) For the case of laminar flow... of total jet momentum. Laminar jet flow is approximated using Schlichting's velocity profile, whereas turbulent flow calculations are made assuming Goertler's velocity profile. Momentum integral principles are applied to the flow at reattachment...

Hadden, Lynne Loise

2012-06-07T23:59:59.000Z

208

River Sediment Analysis by Slurry Sampling FAAS: Determination of Copper, Zinc and Lead Flvia L. Alves, Solange Cadore, Wilson F. Jardim and Marco A. Z. Arruda*  

E-Print Network (OSTI)

Article River Sediment Analysis by Slurry Sampling FAAS: Determination of Copper, Zinc and Lead sediment analysis was developed. Using this procedure, copper, zinc and lead were determined. The influence of the nitric acid concentration on the slurry preparation, as well as the sediment particle size

Jardim, Wilson de Figueiredo

209

Analytical services: 222-S characterization of 242-A Evaporator Slurry, Campaign 94-1. Addendum 1A  

SciTech Connect

During the 242-A Evaporator`s 94-1 campaign, five process samples were collected from the slurry stream for waste characterization. The five samples were collected over a 36 day time span, respectively on May 4, May 9, May 16, May 23, and June 9, 1994. Sample collections were performed per the protocol described in 242-A Evaporator Waste Analysis Plan, WHC-SD-WM-EV-060, Rev. 3 and in 242-A Evaporator Quality Assurance Project Plan, WHC-SD-WM-QAPP-009, Rev. 0. Slurry waste was characterized chemically and radiochemically by the Westinghouse Hanford Company, 222-S Laboratory as directed.

Not Available

1994-09-13T23:59:59.000Z

210

Steam Gasification of Bio-Oil and Bio-Oil/Char Slurry in a Fluidized Bed Reactor  

Science Journals Connector (OSTI)

In the present study, the steam gasification of bio-oil/char slurry was investigated using a lab-scale fluidized bed reactor filled with either Ni-based naphtha steam reforming catalyst or silica sand. ... LOI: Loss on ignition after a 30 min fusion at 1000 °C. ... Table 5. Product Gas Composition (in Mol %) and Heating Value from Steam Gasification of the Bio-Oil and the Slurry with the Catalyst and the Sand at T ? 800°C, H2O/C ? 5.5, and GC1HSV ? 340 h?1; Wet with Nitrogen and Dry Nitrogen Free Basisa ...

Masakazu Sakaguchi; A. Paul Watkinson; Naoko Ellis

2010-08-23T23:59:59.000Z

211

Magnetohydrodynamic Production of Relativistic Jets  

Science Journals Connector (OSTI)

...of the properties of the MHD model. The diagram shows flow velocity...jet. Figure 3 Schematic diagram depicting the MHD acceleration and...of the properties of the MHD model. The diagram shows flow velocity...

David L. Meier; Shinji Koide; Yutaka Uchida

2001-01-05T23:59:59.000Z

212

Strategic Technology JET PROPULSION LABORATORY  

E-Print Network (OSTI)

Strategic Technology Directions JET PROPULSION LABORATORY National Aeronautics and Space Administration 2 0 0 9 #12;© 2009 California Institute of Technology. Government sponsorship acknowledged. #12;Strategic Technology Directions 2009 offers a distillation of technologies, their links to space missions

Waliser, Duane E.

213

Numerical Simulations of Bouncing Jets  

E-Print Network (OSTI)

Bouncing jets are fascinating phenomenons occurring under certain conditions when a jet impinges on a free surface. This effect is observed when the fluid is Newtonian and the jet falls in a bath undergoing a solid motion. It occurs also for non-Newtonian fluids when the jets falls in a vessel at rest containing the same fluid. We investigate numerically the impact of the experimental setting and the rheological properties of the fluid on the onset of the bouncing phenomenon. Our investigations show that the occurrence of a thin lubricating layer of air separating the jet and the rest of the liquid is a key factor for the bouncing of the jet to happen. The numerical technique that is used consists of a projection method for the Navier-Stokes system coupled with a level set formulation for the representation of the interface. The space approximation is done with adaptive finite elements. Adaptive refinement is shown to be very important to capture the thin layer of air that is responsible for the bouncing.

Bonito, Andrea; Lee, Sanghyun

2015-01-01T23:59:59.000Z

214

Deposition Velocities of Non-Newtonian Slurries in Pipelines: Complex Simulant Testing  

SciTech Connect

One of the concerns expressed by the External Flowsheet Review Team (EFRT) is about the potential for pipe plugging at the Waste Treatment and Immobilization Plant (WTP). Per the review’s executive summary, “Piping that transports slurries will plug unless it is properly designed to minimize this risk. This design approach has not been followed consistently, which will lead to frequent shutdowns due to line plugging.” To evaluate the potential for plugging, deposition-velocity tests were performed on several physical simulants to determine whether the design approach is conservative. Deposition velocity is defined as the velocity below which particles begin to deposit to form a moving bed of particles on the bottom of a straight horizontal pipe during slurry-transport operations. The deposition velocity depends on the system geometry and the physical properties of the particles and fluid. An experimental program was implemented to test the stability-map concepts presented in WTP-RPT-175 Rev. 01. Two types of simulant were tested. The first type of simulant was similar to the glass-bead simulants discussed in WTP-RPT-175 Rev. 0 ; it consists of glass beads with a nominal particle size of 150 µm in a kaolin/water slurry. The initial simulant was prepared at a target yield stress of approximately 30 Pa. The yield stress was then reduced, stepwise, via dilution or rheological modifiers, ultimately to a level of <1 Pa. At each yield-stress step, deposition-velocity testing was performed. Testing over this range of yield-stress bounds the expected rheological operating window of the WTP and allows the results to be compared to stability-map predictions for this system. The second simulant was a precipitated hydroxide that simulates HLW pretreated sludge from Hanford waste tank AZ-101. Testing was performed in a manner similar to that for the first simulant over a wide range of yield stresses; however, an additional test of net-positive suction-head required (NPSHR) was performed at each yield stress condition. Unlike the previous simulant, the sizes and densities of the particles that can deposit in the piping are a result of the simulant precipitation process; there is expected to be a complex mixture of particles of various sizes and densities that make it difficult to predict a stability map. The objective of the testing is to observe whether behavior consistent with the stability-map concept occurs in complex simulants with mixtures of different sizes and densities.

Poloski, Adam P.; Bonebrake, Michael L.; Casella, Andrew M.; Johnson, Michael D.; Toth, James J.; Adkins, Harold E.; Chun, Jaehun; Denslow, Kayte M.; Luna, Maria; Tingey, Joel M.

2009-07-01T23:59:59.000Z

215

Innovative process for concentration of fine particle coal slurries. Final technical report, September 1, 1995--August 31, 1996  

SciTech Connect

Williams Technologies, Inc. And Clarke Rajchel Engineering are developing a technology (patent pending) to produce high quality coal water slurries from preparation plant fine coal streams. The WTI/CRE technology uses the novel implementation of high-shear cross-flow separation which replaces and enhances conventional thickening processes by surpassing normally achievable solids loadings. Dilute ultra-fine (minus 100 mesh) solids slurries can be concentrated to greater than 60 weight percent and remixed, as required, with de-watered coarser fractions to produce pumpable, heavily loaded coal slurries. The permeate (filtrate) resulting from this process has been demonstrated to be crystal clear and totally free of suspended solids. The primary objective of this project was to demonstrate the WTI/CRE coal slurry production process technology at the pilot scale. The technology can enable Illinois coal producers and users to realize significant cost and environmental benefits both by eliminating fine coal waste disposal problems and producing an IGCC fuel to produce power which meets all foreseeable clean air standards. Testing was also directed at concentrating mine tailings material to produce a tailings paste which can be mine-back- filled, eliminating the need for tailings ponds. During the grant period, a laboratory-scale test apparatus (up to 3 GPM feed rate) was assembled and operated to demonstrate process performance over a range of feed temperatures and pressures. A dilute coal/water slurry from Consol, Inc.`s Rend Lake Preparation Plant was concentrated with the process to a maximum recorded solids loading of 61.9% solids by weight. Analytical results from the concentrate were evaluated by Destec Energy for suitability as an IGCC fuel.

Rajchel, M.; Ehrlinger, H.P.; Harnett, D.; Fonseca, A.; Maurer, R.

1997-05-01T23:59:59.000Z

216

Slurry phase Fischer-Tropsch synthesis: Cobalt plus a water-gas shift catalyst  

SciTech Connect

This report details experiments performed on three different copper-based catalysts: Cu/Cr[sub 2]O[sub 3], Cu/MnO/Cr[sub 2]O[sub 3] and Cu/ZnO/Al[sub 2]O[sub 3]. Of these three catalysts, the Cu/ZnO/Al[sub 2]O[sub 3] exhibits the greatest stability when slurried in octacosane. More than 1000 hours-on-stream indicate that the catalyst activity is not detrimentally affected by high pressure, high H[sub 2]/CO ratio, or the presence of alkenes. All of these are necessary stability characteristics for the water-gas shift catalyst, if it is to be used in combination with a cobalt Fischer-Tropsch catalyst. A review of documented reduction procedures for cobalt-based Fischer-Tropsch catalysts is presented.

Yates, I.C.; Satterfield, C.N.

1988-01-01T23:59:59.000Z

217

Coal-water-slurry autoignition in a high-speed Detroit diesel engine  

SciTech Connect

Autoignition of coal-water-slurry (CWS) fuel in a two-stroke engine operating at 1900 RPM has been achieved. A Pump-Line-Nozzle (PLN) injection system, delivering 400mm{sup 3} injection of CWS, was installed in one modified cylinder of a Detroit Diesel Corporation (DDC) 8V-149TI engine, while the other seven cylinders remained configured for diesel fuel. Coal Combustion was sustained by maintaining high gas and surface temperatures with a combination of hot residual gases, warm inlet air admission, ceramic insulated components and increased compression ratio. The coal-fueled cylinder generated 85kW indicated power (80 percent of rated power), and lower NO{sub x} levels with a combustion efficiency of 99.2 percent. 6 refs., 15 figs., 4 tabs.

Schwalb, J.A.; Ryan, T.W. III.; Kakwani, R.M.; Winsor, R.E.

1994-10-01T23:59:59.000Z

218

The Georgi Algorithms of Jet Clustering  

E-Print Network (OSTI)

We reveal the direct link between the jet clustering algorithms recently proposed by Howard Georgi and parton shower kinematics, providing sound support from the theoretical side. The kinematics of this class of elegant algorithms is explored systematically and the jet function is generalized to $J^{(n)}_\\beta$ with a jet function index $n$. Based on three basic requirements that the result of jet clustering is process-independent, for softer subjets the inclusion cone is larger, and that the cone size cannot be too large in order to avoid mixing different jets, we derive constraints on the jet function index $n$ and the jet function parameter $\\beta$ which are closely related to phase space boundaries. Finally, we demonstrate that the jet algorithm is boost invariant.

Shao-Feng Ge

2014-08-30T23:59:59.000Z

219

NASA Subsonic Jet Transport Noise Reduction Research  

Science Journals Connector (OSTI)

Although new jet transport airplanes in today''s fleet are considerably quieter than the first jet transports introduced about 40 years ago, airport community noise continues to be an important environmental issue. NASA''s Advanced Subsonic Transport ...

Powell Clemans A.; Preisser John S.

2000-08-01T23:59:59.000Z

220

Coupling of twin rectangular supersonic jets  

E-Print Network (OSTI)

Twin jet plumes on aircraft can couple, producing dynamic pressures significant enough to cause structural fatigue. For closely spaced jets with a moderate aspect ratio (e.g. 5), previous work has established that two ...

Raman, G.; Taghavi, Ray

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Gravity waves from vortex dipoles and jets  

E-Print Network (OSTI)

The dissertation first investigates gravity wave generation and propagation from jets within idealized vortex dipoles using a nonhydrostatic mesoscale model. Several initially balanced and localized jets induced by vortex dipoles are examined here...

Wang, Shuguang

2009-05-15T23:59:59.000Z

222

Jet physics at HERA, Tevatron and LHC  

E-Print Network (OSTI)

In this short report, we discuss the Jet Physics results and perspectives at HERA, Tevatron and LHC.

C. Royon

2008-11-10T23:59:59.000Z

223

Jets in relativistic heavy ion collisions  

SciTech Connect

Several aspects of hard and semihard QCD jets in relativistic heavy ion collisions are discussed, including multiproduction of minijets and the interaction of a jet with dense nuclear matter. The reduction of jet quenching effect in deconfined phase of nuclear matter is speculated to provide a signature of the formation of quark gluon plasma. HIJING Monte Carlo program which can simulate events of jets production and quenching in heavy ion collisions is briefly described. 35 refs., 13 figs.

Wang, Xin-Nian; Gyulassy, M.

1990-09-01T23:59:59.000Z

224

Production of biocomponent containing jet fuels  

Science Journals Connector (OSTI)

Recent demands for low aromatic content jet fuels have shown significant increase in the last 20 years. This was generated by the growing of aviation. Further than quality requirements were more aggravated in front of jet fuels. This was generated by ... Keywords: aromatic content, biocomponent, crystallization point, jet fuel, kerosene, vegetable oil

Z. Eller; P. Solymosi; T. Kasza; Z. Varga; J. Hancsók

2011-12-01T23:59:59.000Z

225

Photoproduction of jets at NLO  

E-Print Network (OSTI)

A new next-to-leading order Monte Carlo program for the calculation of fully differential jet cross sections in photoproduction is described. The contributions from both resolved and direct components are included. A comparison between the theoretical predictions and ZEUS data is presented.

B. W. Harris; J. F. Owens

1996-08-20T23:59:59.000Z

226

The Particle Content of Extragalactic Jets  

E-Print Network (OSTI)

Recent x-ray and radio data from radio sources in galaxy clusters are used to show that the pdV work required to inflate the radio lobes exceeds all other energy estimates deduced from the radio emission. If the required jet energy density has an isotropic pressure, then in almost all cases the jet cannot be confined by an external medium. This problem can be resolved with jets dominated by cold protons, but even here the accompanying energy density in relativistic electons can cause decollimation. Electron-positron jets cannot solve this problem unless they are highly beamed with unusual energy distributions. Poynting flux jets may be a viable alternative.

David S. De Young

2006-05-31T23:59:59.000Z

227

Massachusetts Beryllium Screening Program for Former Workers of Wyman-Gordon, Norton Abrasives, and MIT/Nuclear Metals  

SciTech Connect

The overall objective of this project was to provide medical screening to former workers of Wyman-Gordon Company, Norton Abrasives, and MIT/Nuclear Metals (NMI) in order to prevent and minimize the health impact of diseases caused by site related workplace exposures to beryllium. The program was developed in response to a request by the U.S. Department of Energy (DOE) that had been authorized by Congress in Section 3162 of the 1993 Defense Authorization Act, urging the DOE to â??carry out a program for the identification and ongoing evaluation of current and former DOE employees who are subjected to significant health risks during such employment." This program, funded by the DOE, was an amendment to the medical surveillance program for former DOE workers at the Nevada Test Site (NTS). This programâ??s scope included workers who had worked for organizations that provided beryllium products or materials to the DOE as part of their nuclear weapons program. These organizations have been identified as Beryllium Vendors.

Pepper, L.D.

2008-05-21T23:59:59.000Z

228

Synthetic jets at large Reynolds number and comparison to continuous jets  

SciTech Connect

Experimental measurements and flow visualization of synthetic jets and similar continuous jets are described. The dimensionless stroke length necessary to form a 2-D synthetic jet is between 5 and 10, with wider-nozzle jets consistently requiring a smaller value. Synthetic jets are wider, slower and have more momentum than similar continuous jets. Synthetic jets are generated using four nozzle widths that vary by a factor of four, and the driving frequency is varied over an order of magnitude. The resultant jets are in the range 13.5 < L{sub o}/h < 80.8 and 695 < Re{sub Uo} < 14700. In spite of the large range of stroke lengths, the near-field behavior of the synthetic jets scales with L{sub o}/h.

Smith, B. L. (Barton L.); Swift, G. W. (Gregory W.)

2001-01-01T23:59:59.000Z

229

Jet Dipolarity: Top Tagging with Color Flow  

SciTech Connect

A new jet observable, dipolarity, is introduced that can distinguish whether a pair of subjets arises from a color singlet source. This observable is incorporated into the HEPTopTagger and is shown to improve discrimination between top jets and QCD jets for moderate to high p{sub T}. The impressive resolution of the ATLAS and CMS detectors means that a typical QCD jet at the LHC deposits energy in {Omicron}(10-100) calorimeter cells. Such fine-grained calorimetry allows for jets to be studied in much greater detail than previously, with sophisticated versions of current techniques making it possible to measure more than just the bulk properties of jets (e.g. event jet multiplicities or jet masses). One goal of the LHC is to employ these techniques to extend the amount of information available from each jet, allowing for a broader probe of the properties of QCD. The past several years have seen significant progress in developing such jet substructure techniques. A number of general purpose tools have been developed, including: (i) top-tagging algorithms designed for use at both lower and higher p{sub T} as well as (ii) jet grooming techniques such as filtering, pruning, and trimming, which are designed to improve jet mass resolution. Jet substructure techniques have also been studied in the context of specific particle searches, where they have been shown to substantially extend the reach of traditional search techniques in a wide variety of scenarios, including for example boosted Higgses, neutral spin-one resonances, searches for supersymmetry, and many others. Despite these many successes, however, there is every reason to expect that there remains room for refinement of jet substructure techniques.

Hook, Anson; Jankowiak, Martin; /SLAC /Stanford U., Phys. Dept.; Wacker, Jay G.; /SLAC

2011-08-12T23:59:59.000Z

230

Superclean coal-water slurry combustion testing in an oil-fired boiler  

SciTech Connect

The Pennsylvania State University is conducting a superclean coal-water slurry (SCCWS) program for the United States Department of Energy (DOE) and the Commonwealth of Pennsylvania with the objective of determining the capability of effectively firing SCCWS in an industrial boiler designed for heavy fuel oil. Penn State has entered into a cooperative agreement with DOE to determine if SCCWS (a fuel containing coal with 3.0 wt.% ash and 0.9 wt.% sulfur) can effectively be burned in a heavy fuel oil-designed industrial boiler without adverse impact on boiler rating, maintainability, reliability, and availability. The project will provide information on the design of new systems specifically configured to fire these clean coal-based fuels. The project consists of four phases: (1) design, permitting, and test planning, (2) construction and start up, (3) demonstration and evaluation (1,000-hour demonstration), and (4) program expansion (additional 1,000 hours of testing). The boiler testing wig determine if the SCCWS combustion characteristics, heat release rate, fouling and slagging behavior, corrosion and erosion limits, and fuel transport, storage, and handling characteristics can be accommodated in an oil-designed boiler system. In addition, the proof-of-concept demonstration will generate data to determine how the properties of SCCWS and its parent coal affect boiler performance. Economic factors associated with retrofitting boilers will be identified

Miller, B.G.; Pisupati, S.V.; Poe, R.L.; Morrison, J.L.; Xie, J.; Walsh, P.M.; Wincek, R.T.; Clark, D.A.; Scaroni, A.W.

1993-04-21T23:59:59.000Z

231

Superclean coal-water slurry combustion testing in an oil-fired boiler  

SciTech Connect

The Pennsylvania State University is conducting a superclean coal-water slurry (SCCWS) program with the objective of demonstrating the capability of effectively firing SCCWS in industrial boilers designed for oil. Penn State has entered into a cooperative agreement with DOE to determine if SCCWS (a fuel containing coal with less than 3.0% ash and 0.9% sulfur) can effectively be burned in oil-designed industrial boilers without adverse impact on boiler rating, maintainability, reliability and availability. The project will provide information on the design of new systems specifically configured to fire these clean coal-based fuels. The project consists of three phases: (1) design, permitting, and test planning, (2) construction and start up, and (3) demonstration and evaluation. The boiler testing will determine if the SCCWS combustion characteristics, heat release rate, fouling and slagging behavior, corrosion and erosion limits, and fuel transport, storage, and handling characteristics can be accommodated in an oil-designed boiler system. In addition, the proof-of-concept demonstration will generate data to determine how the properties of SCCWS and its parent coal affect boiler performance. Economic factors associated with retrofitting and operating boilers will be identified to assess the viability of future oil-to-coal retrofits. Progress is reported. 7 refs., 7 figs., 1 tab.

Miller, B.G.; Schobert, H.H.

1990-09-28T23:59:59.000Z

232

Attrition resistant catalysts for slurry-phase Fischer-Tropsch process  

SciTech Connect

The Fischer-Tropsch (F-T) reaction provides a way of converting coal-derived synthesis gas (CO+H{sub 2}) to liquid fuels. Since the reaction is highly exothermic, one of the major problems in control of the reaction is heat removal. Recent work has shown that the use of slurry bubble column reactors (SBCRs) can largely solve this problem. Iron-based (Fe) catalysts are preferred catalysts for F-T because they are relatively inexpensive and possess reasonable activity for F-T synthesis (FTS). Their most advantages trait is their high water-gas shift (WGS) activity compared to their competitor, namely cobalt. This enables Fe F-T catalysts to process low H{sub 2}/CO ratio synthesis gas without an external shift reaction step. However, a serious problem with the use of Fe catalysts in a SBCR is their tendency to undergo attrition. This can cause fouling/plugging of downstream filters and equipment, make the separation of catalyst from the oil/wax product very difficult if not impossible, an d result in a steady loss of catalyst from the reactor. The objectives of this research were to develop a better understanding of the parameters affecting attrition of Fe F-T catalysts suitable for use in SBCRs and to incorporate this understanding into the design of novel Fe catalysts having superior attrition resistance.

K. Jothimurugesan

1999-11-01T23:59:59.000Z

233

Composting of the solid fraction of digestate derived from pig slurry: Biological processes and compost properties  

Science Journals Connector (OSTI)

Abstract The aim of this paper was to assess the characteristics of the solid fractions (SF) obtained by mechanical separation of digestate, their compostability and compost quality. To do so, the SF of digestates obtained from anaerobic digestion of pig slurry, energy crops and agro-industrial residues were sampled in five plants located in Northern Italy. Results obtained indicated that anaerobic digestion by itself promoted the high biological stability of biomasses with a Potential Dynamic Respiration Index (PDRI) close to 1000 mgO2 kg V S?1 h?1. Subsequent composting of digestates, with an added bulking agent, did not give remarkably different results, and led only to a slight modification of the characteristics of the initial non-composted mixtures; the composts obtained fully respected the legal limits for high quality compost. Chemical studies of organic matter composition of the biomasses by using CP MAS 13C NMR, indicated that the compost was composed of a high relative content of O-alkyl-C (71.47% of total C) (cellulose and hemicelluloses) and a low alkyl-C (12.42%) (i.e. volatile fatty acids, steroid-like molecules, aliphatic biopolymers and proteins).

Fulvia Tambone; Laura Terruzzi; Barbara Scaglia; Fabrizio Adani

2014-01-01T23:59:59.000Z

234

ANALYSES AND COMPARISON OF BULK AND COIL SURFACE SAMPLES FROM THE DWPF SLURRY MIX EVAPORATOR  

SciTech Connect

Sludge samples from the DWPF Slurry Mix Evaporator (SME) heating coil frame and coil surface were characterized to identify differences that might help identify heat transfer fouling materials. The SME steam coils have seen increased fouling leading to lower boil-up rates. Samples of the sludge were taken from the coil frame somewhat distant from the coil (bulk tank material) and from the coil surface (coil surface sample). The results of the analysis indicate the composition of the two SME samples are very similar with the exception that the coil surface sample shows {approx}5-10X higher mercury concentration than the bulk tank sample. Elemental analyses and x-ray diffraction results did not indicate notable differences between the two samples. The ICP-MS and Cs-137 data indicate no significant differences in the radionuclide composition of the two SME samples. Semi-volatile organic analysis revealed numerous organic molecules, these likely result from antifoaming additives. The compositions of the two SME samples also match well with the analyzed composition of the SME batch with the exception of significantly higher silicon, lithium, and boron content in the batch sample indicating the coil samples are deficient in frit relative to the SME batch composition.

Hay, M.; Nash, C.; Stone, M.

2012-02-17T23:59:59.000Z

235

The conversion of natural gas to liquid fuels using the Sasol Slurry Phase Distillate Process  

SciTech Connect

The natural gas and energy industries have long sought an economically attractive means of converting remote gas reserves into transportable products, such as fuels or petrochemicals. Applicable gas sources include: undeveloped gas fields in locations so remote that pipeline construction is prohibitively expensive and associated gas from oil wells that is either flared, which is becoming environmentally unacceptable in many parts of the world, or reinjected, which is costly. Projects which have been developed to exploit such feeds typically have converted the gas into one of the following: (1) liquefied natural gas (LNG)--the process plants for LNG production are expensive, need to be very large to be economically viable, have costly dedicated shipping requirements, and suffer from a limited market concentrated in few countries; (2) methanol--the market for petrochemical feedstock methanol is limited, for use as a fuel, further downstream processing is needed, for example in a methyl tertiary butyl ether (MTBE) or methanol to gasoline (MTG) unit. Clearly, there is a need for an alternative that produces high quality fuels or value added products that can be transported to far-off markets, while yielding an attractive return on the developers` investment. The Sasol Slurry Phase Distillate Process will fulfill this need.

Silverman, R.W. [Raytheon Engineers and Constructors, Cambridge, MA (United States); Hill, C.R. [Sastech, Johannesburg (South Africa)

1997-12-31T23:59:59.000Z

236

Simple thermodynamics of jet engines  

Science Journals Connector (OSTI)

We use the first and second laws of thermodynamics to analyze the behavior of an ideal jet engine. Simple analytical expressions for the thermal efficiency the overall efficiency and the reduced thrust are derived. We show that the thermal efficiency depends only on the compression ratio r and on the velocity of the aircraft. The other two performance measures depend also on the ratio of the temperature at the turbine to the inlet temperature in the engine T 3 / T i . An analysis of these expressions shows that it is not possible to choose an optimal set of values of r and T 3 / T i that maximize both the overall efficiency and thrust. We study how irreversibilities in the compressor and the turbine decrease the overall efficiency of jet engines and show that this effect is more pronounced for smaller T 3 / T i .

Pedro Patrício; José M. Tavares

2010-01-01T23:59:59.000Z

237

Numerical Simulations of Bouncing Jets  

E-Print Network (OSTI)

downhill gliding of the pool, at about 4mm/s of pool surface velocity. . . . . . . . . . . . . . . . . . . . . . 87 viii 5.7 Overall view of the shampoo jet bouncing of an inclined pool of the same liquid. The white arrow points at he breakup of the air....4 Time discretization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 3.5 Entropy residual stabilization . . . . . . . . . . . . . . . . . . . . . . 58 3.6 Adaptive mesh refinement . . . . . . . . . . . . . . . . . . . . . . . . 61 iv 3.7...

Lee, Sanghyun

2014-07-18T23:59:59.000Z

238

Pulse Jet Mixer Overblow Testing for Assessment of Loadings During Multiple Overblows  

SciTech Connect

The U.S. Department of Energy (DOE) Office of River Protection’s Waste Treatment Plant (WTP) is being designed and built to pretreat and then vitrify a large portion of the wastes in Hanford’s 177 underground waste storage tanks. The WTP consists of three primary facilities: pretreatment, low-activity waste (LAW) vitrification, and high-level waste (HLW) vitrification. The pretreatment facility will receive waste feed from the Hanford tank farms and separate it into 1) a high-volume, low-activity liquid stream stripped of most solids and radionuclides and 2) a much smaller volume of HLW slurry containing most of the solids and most of the radioactivity. Many of the vessels in the pretreatment facility will contain pulse jet mixers (PJMs) that will provide some or all of the mixing in the vessels. This technology was selected for use in so-called “black cell” regions of the WTP, where maintenance capability will not be available for the operating life of the WTP. PJM technology was selected for use in these regions because it has no moving mechanical parts that require maintenance. The vessels with the most concentrated slurries will also be mixed with air spargers and/or steady jets in addition to the mixing provided by the PJMs. This report contains the results of single and multiple PJM overblow tests conducted in a large, ~13 ft-diameter × 15-ft-tall tank located in the high bay of the Pacific Northwest National Laboratory (PNNL) 336 Building test facility. These single and multiple PJM overblow tests were conducted using water and a clay simulant to bound the lower and upper rheological properties of the waste streams anticipated to be processed in the WTP. Hydrodynamic pressures were measured at a number of locations in the test vessel using an array of nine pressure sensors and four hydrophones. These measurements were made under normal and limiting vessel operating conditions (i.e., maximum PJM fluid emptying velocity, maximum and minimum vessel contents for PJM operation, and maximum and minimum rheological properties). Test data collected from the PJM overblow tests were provided to Bechtel National, Inc. (BNI) for assessing hydrostatic, dynamic, and acoustic pressure loadings on in-tank structures during 1) single overblows; 2) multiple overlapping overblows of two to four PJMs; 3) simultaneous overblows of pairs of PJMs.

Pfund, David M.; Bontha, Jagannadha R.; Michener, Thomas E.; Nigl, Franz; Yokuda, Satoru T.; Leigh, Richard J.; Golovich, Elizabeth C.; Baumann, Aaron W.; Kurath, Dean E.; Hoza, Mark; Combs, William H.; Fort, James A.; Bredt, Ofelia P.

2009-07-20T23:59:59.000Z

239

Pulse Jet Mixer Overblow Testing for Assessment of Loadings During Multiple Overblows  

SciTech Connect

The U.S. Department of Energy (DOE) Office of River Protection’s Waste Treatment Plant (WTP) is being designed and built to pretreat and then vitrify a large portion of the wastes in Hanford’s 177 underground waste storage tanks. The WTP consists of three primary facilities: pretreatment, low-activity waste (LAW) vitrification, and high-level waste (HLW) vitrification. The pretreatment facility will receive waste feed from the Hanford tank farms and separate it into 1) a high-volume, low-activity liquid stream stripped of most solids and radionuclides and 2) a much smaller volume of HLW slurry containing most of the solids and most of the radioactivity. Many of the vessels in the pretreatment facility will contain pulse jet mixers (PJMs) that will provide some or all of the mixing in the vessels. This technology was selected for use in so-called “black cell” regions of the WTP, where maintenance capability will not be available for the operating life of the WTP. PJM technology was selected for use in these regions because it has no moving mechanical parts that require maintenance. The vessels with the most concentrated slurries will also be mixed with air spargers and/or steady jets in addition to the mixing provided by the PJMs. This report contains the results of single and multiple PJM overblow tests conducted in a large, ~13 ft-diameter × 15-ft-tall tank located in the high bay of the Pacific Northwest National Laboratory (PNNL) 336 Building test facility. These single and multiple PJM overblow tests were conducted using water and a clay simulant to bound the lower and upper rheological properties of the waste streams anticipated to be processed in the WTP. Hydrodynamic pressures were measured at a number of locations in the test vessel using an array of nine pressure sensors and four hydrophones. These measurements were made under normal and limiting vessel operating conditions (i.e., maximum PJM fluid emptying velocity, maximum and minimum vessel contents for PJM operation, and maximum and minimum rheological properties). Test data collected from the PJM overblow tests were provided to Bechtel National, Inc. (BNI) for assessing hydrostatic, dynamic, and acoustic pressure loadings on in-tank structures during 1) single overblows; 2) multiple overlapping overblows of two to four PJMs; 3) simultaneous overblows of pairs of PJMs.

Pfund, David M.; Bontha, Jagannadha R.; Michener, Thomas E.; Nigl, Franz; Yokuda, Satoru T.; Leigh, Richard J.; Golovich, Elizabeth C.; Baumann, Aaron W.; Kurath, Dean E.; Hoza, Mark; Combs, William H.; Fort, James A.; Bredt, Ofelia P.

2008-03-03T23:59:59.000Z

240

Combining Resummed Higgs Predictions Across Jet Bins  

E-Print Network (OSTI)

Experimental analyses often use jet binning to distinguish between different kinematic regimes and separate contributions from background processes. To accurately model theoretical uncertainties in these measurements, a consistent description of the jet bins is required. We present a complete framework for the combination of resummed results for production processes in different exclusive jet bins, focusing on Higgs production in gluon fusion as an example. We extend the resummation of the Higgs + 1-jet cross section into the challenging low transverse momentum region, lowering the uncertainties considerably. We provide combined predictions with resummation for cross sections in the Higgs + 0-jet and Higgs + 1-jet bins, and give an improved theory covariance matrix for use in experimental studies. We estimate that the relevant theoretical uncertainties on the signal strength in the Higgs to WW analysis are reduced by nearly a factor of 2 compared to the current value.

Radja Boughezal; Xiaohui Liu; Frank Petriello; Frank J. Tackmann; Jonathan R. Walsh

2013-12-16T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

LDV Measurement of Confined Parallel Jet Mixing  

SciTech Connect

Laser Doppler Velocimetry (LDV) measurements were taken in a confinement, bounded by two parallel walls, into which issues a row of parallel jets. Two-component measurements were taken of two mean velocity components and three Reynolds stress components. As observed in isolated three dimensional wall bounded jets, the transverse diffusion of the jets is quite large. The data indicate that this rapid mixing process is due to strong secondary flows, transport of large inlet intensities and Reynolds stress anisotropy effects.

R.F. Kunz; S.W. D'Amico; P.F. Vassallo; M.A. Zaccaria

2001-01-31T23:59:59.000Z

242

Jet-calculus approach including coherence effects  

Science Journals Connector (OSTI)

We show how integrodifferential equations typical of jet calculus can be combined with an averaging procedure to obtain jet-calculus-based results including the Mueller interference graphs. Results in longitudinal-momentum fraction x for physical quantities are higher at intermediate x and lower at large x than with the conventional ‘‘incoherent’’ jet calculus. These results resemble those of Marchesini and Webber, who used a Monte Carlo approach based on the same dynamics.

L. M. Jones; R. Migneron; K. S. S. Narayanan

1987-01-01T23:59:59.000Z

243

Entropy Production in Relativistic Jet Boundary Layers  

E-Print Network (OSTI)

Hot relativistic jets, passing through a background medium with a pressure gradient p \\propto r^{-\\eta} where 2 gamma-ray bursts from ...

Kohler, Susanna

2014-01-01T23:59:59.000Z

244

Increasing jet entrainment, mixing and spreading  

DOE Patents (OSTI)

A free jet of air is disturbed at a frequency that substantially matches natural turbulences in the free jet to increase the entrainment, mixing, and spreading of air by the free jet, for example in a room or other enclosure. The disturbances are created by pulsing the flow of air that creates the free jet at the desired frequency. Such pulsing of the flow of air can be accomplished by sequentially occluding and opening a duct that confines and directs the flow of air, such as by rotating a disk on an axis transverse to the flow of air in the duct. 11 figs.

Farrington, R.B.

1994-08-16T23:59:59.000Z

245

Atmospheric Plasma Jet Machining of Optical Surfaces  

Science Journals Connector (OSTI)

Deterministic surface machining with high spatial resolution and nanometric depth accuracy is urgently required in the fabrication of high-end optics. Thus, plasma jet tools with...

Böhm, Georg; Eichentopf, Inga-Maria; Arnold, Thomas

246

Numerical investigation of a transient free jet resembling a laser-produced vapor jet  

E-Print Network (OSTI)

jet. They reported the penetration length and spreading rate of a non-harmonic unsteady jet that the en- trainment rate varied linearly with axial penetration, and the total mass entrainment had a cubic to investigate the transient jet [1­3]. Kouros et al. [4] measured the spreading rate of an unsteady turbulent

Budair, Mohammed Omar

247

Drying characteristics of slot jet reattachment nozzle and comparison with a slot jet nozzle  

E-Print Network (OSTI)

the same flow power and flow exerted surface peak pressure. The same flow power results showed that +45[] and +20[] SJR nozzles performed better than the slot jet nozzle, while the 0[] SJR had drying characteristics similar to the slot jet. The slot jet...

Alam, Syed Aftab

2012-06-07T23:59:59.000Z

248

Plasma jets and plasma bullets  

Science Journals Connector (OSTI)

Plasma plumes, or plasma jets, belong to a large family of gas discharges whereby the discharge plasma is extended beyond the plasma generation region into the surrounding ambience, either by a field (e.g. electromagnetic, convective gas flow, or shock wave) or a gradient of a directionless physical quantity (e.g. particle density, pressure, or temperature). This physical extension of a plasma plume gives rise to a strong interaction with its surrounding environment, and the interaction alters the properties of both the plasma and the environment, often in a nonlinear and dynamic fashion. The plasma is therefore not confined by defined physical walls, thus extending opportunities for material treatment applications as well as bringing in new challenges in science and technology associated with complex open-boundary problems. Some of the most common examples may be found in dense plasmas with very high dissipation of externally supplied energy (e.g. in electrical, optical or thermal forms) and often in or close to thermal equilibrium. For these dense plasmas, their characteristics are determined predominantly by strong physical forces of different fields, such as electrical, magnetic, thermal, shock wave, and their nonlinear interactions [1]. Common to these dense plasma plumes are significant macroscopic plasma movement and considerable decomposition of solid materials (e.g. vaporization). Their applications are numerous and include detection of elemental traces, synthesis of high-temperature materials and welding, laser--plasma interactions, and relativistic jets in particle accelerators and in space [2]–[4]. Scientific challenges in the understanding of plasma jets are exciting and multidisciplinary, involving interweaving transitions of all four states of matter, and their technological applications are wide-ranging and growing rapidly. Using the Web of Science database, a search for journal papers on non-fusion plasma jets reveals that a long initial phase up to 1990 with only 31 papers per year on average, and a total of some 1300 papers, precedes a considerable growth of some 35–50% in research activity every five years, over the last 20 years or so. As shown in the table, the annual dissemination of the field is more than 1600 papers and the total number of papers is in excess of 20000. This upwards trajectory is typical of a strong and growing subject area in physical science, with considerable capacity in both fundamental science and applications. PeriodNumber of papersPapers per annum 1948–1990130031 1991–19952279456 1996–20003447689 2001–20054571914 2006–201066401328 2011 1658 In many of the dense plasma jets discussed above, strong physical forces generated by the plasma are often desired and this favours plasma generation at elevated gas pressure, including atmospheric pressure, which favours a high level of gas ionization. Historically it has been challenging to reduce and control the strong physical forces in high-pressure plasmas for applications where these are unwanted, for example, surface modification of polymeric sheets [5]. Indeed, there is a real need for a vast range of material processing applications at temperatures below 100oC (or below 400 K) and this favours atmospheric-pressure plasma jets sustained far from thermal equilibrium with the dissipated electrical energy largely used not in heat generation but in unleashing non-equilibrium chemical reactions. The long-standing difficulty of effectively controlling the level of gas ionization at atmospheric pressure was overcome by the technological breakthrough of achieving atmospheric-pressure glow discharges in the late 1980s [6]. A related challenge stemming from high collisionality of atmospheric-pressure plasmas (v >> ?0) means that large-area plasmas sustained between parallel-plate electrodes are very susceptible to strong plasma instabilities when molecular gases are introduced for processing applications. This led to an effective technological solution in the early to late 1990s of confining atmospheric plasmas in a small v

M G Kong; B N Ganguly; R F Hicks

2012-01-01T23:59:59.000Z

249

Space variations in axis height of the jet stream core  

E-Print Network (OSTI)

height of the jet axis relative to the height of the jet maximum for slow vs. fast cases. 13 Mean height of the jet axis relative to the height at the trough. 13 Mean height of the jet axis relative to the height at the ridge. 15 Mean height... of the jet axis relative to the height at the jet maximum, when the maximum is near a trough. 15 Mean height of the jet axis relative to the height at the minimum, when the minimum is near a ridge. 17 Mean height of the jet axis relative to the height...

Leutwyler, Cooke Hearon

1965-01-01T23:59:59.000Z

250

Simulation of jets at colliders  

Science Journals Connector (OSTI)

Abstract We review the development of the physics behind event generators during the last decade. After a more general description of parton showers, we focus mostly on the perturbative side of the simulations. Two newer developments of parton showers, as implemented in herwig++, are described in greater detail. Matching and merging of parton showers with fixed order computations are discussed. We describe some developments of multiple partonic interactions which are relevant for the simulation of jets from the underlying event, where the implementation in herwig++  is again taken as a generic example. Finally, we compare some event generator results to collider data from LEP and the LHC.

Stefan Gieseke

2013-01-01T23:59:59.000Z

251

Blending high sulfer coal with refuse derived fuel to make SO{sub 2} compliant slurry fuels  

SciTech Connect

The need for a better method of disposing of the international community`s garbage hardly needs emphasizing. In 1993, the United States alone generated approximately 207 million ton per year of Municipal Solid Waste (MSW), with 62% landfilled, 220/6 recycled, and 16% combusted for energy recovery. Despite strenuous efforts to make these disposal methods meet present needs, the cost of disposal is rising dramatically. Concurrently, the Clean Air Act Amendments (CAAA) of 1990 have severely restricted the SO{sub 2} emissions from coal fired boilers. Medium and high sulfur coals will not comply with the Phase II CAAA regulation limit of 1.2 lb SO{sub 2}/MM Btu, without advanced coal cleaning technologies or flue gas desulfurization, including the majority of the North Dakota lignite reserves. Utility power plants have attempted to burn refuse derived fuel (RDF), a heterogeneous solid fuel produced from MSW, with coal in utility scale boilers (generally referred to as co-firing). Co-firing of RDF with coal has been attempted in sixteen different boilers, five commercially. While lower SO{sub 2} emissions provided the impetus, co-firing RDF with coal suffered from several disadvantages including increased solids handling, increased excess air requirements, higher HCI, CO, NO{sub x} and chlorinated organic emissions, increased slag formation in the boiler, and higher fly ash resistivity. Currently, only two of the sixteen boilers are still regularly used to co-fire RDF. The overall objective of this research program was to assess the feasibility of blending RDF with lignite coal to form SO{sub 2} Compliant slurry fuels using EnerTech`s SlurryCarb{trademark} process. In particular, the objective was to overcome the difficulties of conventional co-firing. Blended slurry fuels were produced with the Energy & Environmental Research Center`s (EERC) bench-scale autoclave and were combusted in a pressurized fluidized-bed reactor (PFBR).

Klosky, M. [EnerTech Environmental, Inc., Atlanta, GA (United States); Anderson, C. [Energy & Environmental Research Center, Grand Forks, ND (United States)

1995-12-31T23:59:59.000Z

252

Principles of Jet Propulsion and Gas Turbines  

Science Journals Connector (OSTI)

... the presentation of the basic theory of jet propulsion and the thermodynamics of the gas-turbine and rocket types of engine. The layout follows a logical sequence, on the whole ... reader is treated to the now well-known thermodynamic analysis of the power-producing gas turbine cycle, which seems rather misplaced in a book dealing with jet propulsion. In his ...

S. J. MOYES

1949-08-06T23:59:59.000Z

253

Cover: Mariner 9 spacecraft. JET PROPULSION  

E-Print Network (OSTI)

#12;Cover: Mariner 9 spacecraft. #12;JET PROPULSION LABORATORY 1971 ANNUAL REPORT A descrtptlon Jet Propulsion Laboratory CALIFORNIA INSTITUTE OF TECHNOLOGY 4800 OAK GROVE DRIVE PASADENA, CALIFORNIA 91103 #12;#12;DIRECTOR'S MESSAGE The successful orbiting of Mariner 9 around the planet Mars

Waliser, Duane E.

254

Miniconference on astrophysical jets P. M. Bellan  

E-Print Network (OSTI)

and numerical modelers of both astrophysical jets and spheromaks, and laboratory experimentalists. The purpose-organization. Spheromaks have been studied for the last two decades and most recently, it has been realized that the physics of spheromak formation has much in common with magnetohydrodynamically driven astrophysical jets

Bellan, Paul M.

255

Investigating Jet Mixing Using Electrical Resistance Tomography  

Science Journals Connector (OSTI)

Coaxial jet and side entry mixers are used in a wide range of industries for a variety of processes including precipitation polymerization and neutralization duties. Jet mixers are characterized by short contact times between the fluids and can be operated continuously or semi?batch. Coaxial and side entry jets can be designed in order to deliver rapid turbulent mixing using short sections of pipeline. As the energy required for mixing is provided by the addition stream the process?side pressure drop required for homogeneity is very low. A key design parameter for jet mixers is the mixing length the length of pipe downstream of the injection point required to achieve a given degree of homogeneity. The mixing length can be affected by the addition geometry (for example coaxial or side entry) orifice size and shape operating conditions and material properties. This paper presents the use of Electrical Resistance Tomography (ERT) to monitor jet mixing via the addition of a conductivity tracer through coaxial and side entry jets. Multiple ERT sensors are fitted along the pipe downstream of the jet addition point. The ERT sensors enable real time non?invasive measurement of conductivity within the pipe furnishing approximately 2500 conductivity measurements per ERT sensor when modeled independently in 3D. The effect of secondary (main pipe) flow rate and jet configuration on the nature of the tracer plume evolution and axial mixing is determined using this technique.

D. R. Stephenson; M. Cooke; A. Kowalski; T. A. York

2007-01-01T23:59:59.000Z

256

Jet multiplicities as the QGP thermometer  

E-Print Network (OSTI)

It is proposed to use the energy behavior of mean multiplicities of jets propagating in a nuclear medium as the thermometer of this medium during the collision phases. The qualitative effects are demonstrated in the framework of the fixed coupling QCD with account of jet quenching.

I. M. Dremin; O. S. Shadrin

2006-02-10T23:59:59.000Z

257

High-Pressure Gasification of Coal Water Ethanol Slurry in an Entrained Flow Gasifier for Bioethanol Application  

Science Journals Connector (OSTI)

In comparison to CWS gasification, gasification with CWES showed a higher performance, such as composition of hydrogen and carbon monoxide, carbon conversion, cold gas efficiency, and total flow rate of syngas. ... As for the preparation of CWS and CWES, viscosity of 2000 cP or under was maintained while maintaining the maximum coal content, so that the coal particles could be atomized when the slurry was injected into the burner. ... The gasifier was preheated to approximately 1100 °C using a LPG burner, and after feeding CWS or CWES into the gasifier, syngas starts to be produced, whereby pressurization proceeds. ...

Jong-Soo Bae; Dong-Wook Lee; Se-Joon Park; Young-Joo Lee; Jai-Chang Hong; Ho Won Ra; Choon Han; Young-Chan Choi

2012-08-10T23:59:59.000Z

258

Application of the Granuflow Process to Pipeline-Transported Coal Slurry CRADA PC96-010, Final Report  

SciTech Connect

In light of the current difficulties in processing fine coal and the potential for a significant increase in fines due to more demanding quality specifications, the U.S. Department of Energy's Federal Energy Technology Center (FETC) has been involved in the reconstitution of the fine clean coal resulting from advanced fine coal cleaning technologies. FETC has invented and developed a new strategy that combines fine-coal dewatering and reconstitution into one step. The process reduces the moisture content of the clean coal, and alleviates handling problems related to dustiness, stickiness, flowability, and freezing. This process has been named the GranuFlow Process. Early work successfully demonstrated the feasibility of the process for laboratory-scale vacuum filtration dewatering using asphalt emulsion. Further tests focused on the application of the process to a screen-bowl centrifuge via batch mode tests at 300 lb/hr. These tests produced roughly the same results as the laboratory filtration tests did, and they included some testing using Orimulsion, a bitumen emulsion. The Orimulsion seemed to offer greater potential for moisture reduction and was less affected by colder slurry temperatures. Most recently, FETC has conducted several series of tests in its Coal Preparation Process Research Facility. These tests dramatically showed the visible difference in the dewatered product by applying the GranuFlow Process, turning it from a clumpy, wet, sticky material into a granular, dry free-flowing product. In addition, it verified previous results with improvements in moisture content, dustiness, stickiness, and freezing. Orimulsion showed a significant benefit over asphalt emulsion in moisture reduction at additions more than 5%. The overall goal of this project was to successfully apply FETC'S GranuFlow Process to improve coal slurry pipeline operations. Williams Technologies, Inc. (WTI), a leader in pipeline technology, has an interest in reducing the moisture content of the coal at the end of a coal slurry pipeline beyond what is being achieved with conventional mechanical dewatering technology. In addition, they would like to improve the handling characteristics of the dewatered coal. The GranuFlow Process has the potential of assisting in both of these areas, and its degree of applicability needed to be explored. A formal Cooperative Research and Development Agreement (CRADA) between FETC and WTI was signed in November 1996. This CRADA consisted of 6 tasks progressing from preliminary scoping tests to a commercial field test. Task 1 was completed in February 1997, and it provided sufficient information about the applicability of the GranuFlow Process to coal slurry pipelines that further testing was not needed at the present time. Thus the CRADA was terminated.

Richard P. Killmeyer; Wu-Wey Wen

1997-09-24T23:59:59.000Z

259

Process for the solvent extraction for the radiolysis and dehalogenation of halogenated organic compounds in soils, sludges, sediments and slurries  

DOE Patents (OSTI)

A process of extracting halogenated organic compounds, and particularly PCBs, from soil, sediment, slurry, sludge and dehalogenating the compounds contacting a contaminated soil sample with an extraction medium of a mixture of an alkane and a water miscible alcohol. The organic compounds dissolve in the extraction medium which is separated from the soil by passing water upwardly through the soil. The extraction medium floats to the surface of the water and is separated. Thereafter, the extraction medium containing the halogenated organic contaminants is subjected to ionizing radiation to radiolytically dehalogenate the compounds.

Mincher, Bruce J. (3705 Creekside Dr., Idaho Falls, ID 83404); Curry, Randy Dale (1104 Merrill Ct., Columbia, MO 65203); Clevenger, Thomas E. (2512 Bluff Blvd., Columbia, MO 65201); Golden, Jeffry (12612 Cedarbrook La., Laurel, MD 20708)

2000-01-01T23:59:59.000Z

260

Method of producing a colloidal fuel from coal and a heavy petroleum fraction. [partial liquefaction of coal in slurry, filtration and gasification of residue  

DOE Patents (OSTI)

A method is provided for combining coal as a colloidal suspension within a heavy petroleum fraction. The coal is broken to a medium particle size and is formed into a slurry with a heavy petroleum fraction such as a decanted oil having a boiling point of about 300 to 550/sup 0/C. The slurry is heated to a temperature of 400 to 500/sup 0/C for a limited time of only about 1 to 5 minutes before cooling to a temperature of less than 300/sup 0/C. During this limited contact time at elevated temperature the slurry can be contacted with hydrogen gas to promote conversion. The liquid phase containing dispersed coal solids is filtered from the residual solids and recovered for use as a fuel or feed stock for other processes. The residual solids containing some carbonaceous material are further processed to provide hydrogen gas and heat for use as required in this process.

Longanbach, J.R.

1981-11-13T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Examination Of Sulfur Measurements In DWPF Sludge Slurry And SRAT Product Materials  

SciTech Connect

Savannah River National Laboratory (SRNL) was asked to re-sample the received SB7b WAPS material for wt. % solids, perform an aqua regia digestion and analyze the digested material by inductively coupled plasma - atomic emission spectroscopy (ICP-AES), as well as re-examine the supernate by ICP-AES. The new analyses were requested in order to provide confidence that the initial analytical subsample was representative of the Tank 40 sample received and to replicate the S results obtained on the initial subsample collected. The ICP-AES analyses for S were examined with both axial and radial detection of the sulfur ICP-AES spectroscopic emission lines to ascertain if there was any significant difference in the reported results. The outcome of this second subsample of the Tank 40 WAPS material is the first subject of this report. After examination of the data from the new subsample of the SB7b WAPS material, a team of DWPF and SRNL staff looked for ways to address the question of whether there was in fact insoluble S that was not being accounted for by ion chromatography (IC) analysis. The question of how much S is reaching the melter was thought best addressed by examining a DWPF Slurry Mix Evaporator (SME) Product sample, but the significant dilution of sludge material, containing the S species in question, that results from frit addition was believed to add additional uncertainty to the S analysis of SME Product material. At the time of these discussions it was believed that all S present in a Sludge Receipt and Adjustment Tank (SRAT) Receipt sample would be converted to sulfate during the course of the SRAT cycle. A SRAT Product sample would not have the S dilution effect resulting from frit addition, and hence, it was decided that a DWPF SRAT Product sample would be obtained and submitted to SRNL for digestion and sample preparation followed by a round-robin analysis of the prepared samples by the DWPF Laboratory, F/H Laboratories, and SRNL for S and sulfate. The results of this round-robin analytical study are the second subject of this report.

Bannochie, C. J.; Wiedenman, B. J.

2012-11-29T23:59:59.000Z

262

Small (5 million Btu/h) and large (300 million Btu/h) thermal test rigs for coal and coal slurry burner development  

SciTech Connect

NEI International Combustion Ltd. of Derby, England, now operates two thermal test rigs for the development of burners capable of handling coal-water slurries (CWS). A general description of the large rig and its capacity was given. Also, the necessary conversions of the equipment to handle CWS were described. Information on the properties of the CWS was included. This consisted of chemical analysis of the parent coal and the slurry, sieve analysis of a dry sample, and viscosity versus temperature data of the CWS. The process of design development of the burner was outlined. Ten illustrations were presented, including schematic diagrams of equipment and graphs of data.

Allen, J.W.; Beal, P.R.; Hufton, P.F.

1983-01-01T23:59:59.000Z

263

Composite Octet Searches with Jet Substructure  

SciTech Connect

Many new physics models with strongly interacting sectors predict a mass hierarchy between the lightest vector meson and the lightest pseudoscalar mesons. We examine the power of jet substructure tools to extend the 7 TeV LHC sensitivity to these new states for the case of QCD octet mesons, considering both two gluon and two b-jet decay modes for the pseudoscalar mesons. We develop both a simple dijet search using only the jet mass and a more sophisticated jet substructure analysis, both of which can discover the composite octets in a dijet-like signature. The reach depends on the mass hierarchy between the vector and pseudoscalar mesons. We find that for the pseudoscalar-to-vector meson mass ratio below approximately 0.2 the simple jet mass analysis provides the best discovery limit; for a ratio between 0.2 and the QCD-like value of 0.3, the sophisticated jet substructure analysis has the best discovery potential; for a ratio above approximately 0.3, the standard four-jet analysis is more suitable.

Bai, Yang; /SLAC; Shelton, Jessie; /Yale U.

2012-02-14T23:59:59.000Z

264

Dark jets in solar coronal holes  

E-Print Network (OSTI)

A new solar feature termed a dark jet is identified from observations of an extended solar coronal hole that was continuously monitored for over 44 hours by the EUV Imaging Spectrometer on board the Hinode spacecraft in 2011 February 8-10. Line-of-sight velocity maps derived from the coronal Fe XII $\\lambda$195.12 emission line, formed at 1.5 MK, revealed a number of large-scale, jet-like structures that showed significant blueshifts. The structures had either weak or no intensity signal in 193 A filter images from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory, suggesting that the jets are essentially invisible to imaging instruments. The dark jets are rooted in bright points and occur both within the coronal hole and at the quiet Sun-coronal hole boundary. They exhibit a wide range of shapes, from narrow columns to fan-shaped structures, and sometimes multiple jets are seen close together. A detailed study of one dark jet showed line-of-sight speeds increasing along the jet axis fr...

Young, Peter R

2015-01-01T23:59:59.000Z

265

Jet Reconstruction in Heavy Ion Collisions  

E-Print Network (OSTI)

Measurements of strong suppression of inclusive hadron distributions and di-hadron correlations at high $p_{T}$, while providing evidence for partonic energy loss, also suffer from geometric biases due to the competition of energy loss and fragmentation. The measurements of fully reconstructed jets is expected to lack these biases as the energy flow is measured independently of the fragmentation details. In this article, we review the recent results from the heavy ion collisions collected by the STAR experiment at RHIC on direct jet reconstruction utilizing the modern sequential recombination and cone jet reconstruction algorithms together with their background subtraction techniques. In order to assess the jet reconstruction biases a comparison with the jet cross section measurement in $\\sqrt{s}=200$ GeV p+p collisions scaled by the number of binary nucleon-nucleon collisions to account for nuclear geometric effects is performed. Comparison of the inclusive jet cross section obtained in central Au+Au events with that in $p+p$ collisions, published previously by STAR, suggests that unbiased jet reconstruction in the complex heavy ion environment indeed may be possible.

Sevil Salur

2009-05-12T23:59:59.000Z

266

Jet production in ep collisions Pierre Van Mechelen  

E-Print Network (OSTI)

Jet production in ep collisions Pierre Van Mechelen University of Antwerpen Pierre electroproduction #12; Jet production in ep collisions Pierre Van Mechelen HERA, H1 and ZEUS H1 ZEUS p (920 GeV) e ± (27.6 GeV) #12; Jet production in ep collisions Pierre Van Mechelen Jet finding algorithms Clustering

267

Squark and gluino production with jets  

SciTech Connect

We present cross section predictions for squark and gluino production at the LHC, in association with up to two additional hard jets. These cross sections can be very large in comparison to the inclusive Born rates. Because hadron collider experiments utilize hard jets in the reconstruction of cascade decays or as a way to separate squark and gluino production, the understanding of these processes is crucial. We show to what degree hard jet radiation can be described by shower algorithms and point out how tuning these showers, for example to top quark pair production, could help reduce theoretical uncertainties for new physics searches at the LHC.

Plehn, T.; /Munich, Max Planck Inst.; Rainwater, D.; /Rochester U.; Skands, P.; /Fermilab

2005-10-01T23:59:59.000Z

268

Jet spoiler arrangement for wind turbine  

DOE Patents (OSTI)

An air jet spoiler arrangement is provided for a Darrieus-type vertical axis wind-powered turbine. Air is drawn into hollow turbine blades through air inlets at the end thereof and is ejected in the form of air jets through small holes or openings provided along the lengths of the blades. The air jets create flow separation at the surfaces of the turbine blades, thereby including stall conditions and reducing the output power. A feedback control unit senses the power output of the turbine and controls the amount of air drawn into the air inlets accordingly.

Cyrus, J.D.; Kadlec, E.G.; Klimas, P.C.

1983-09-15T23:59:59.000Z

269

Top quark jets at the LHC  

Science Journals Connector (OSTI)

We investigate the reconstruction of high pT hadronically decaying top quarks at the Large Hadron Collider. One of the main challenges in identifying energetic top quarks is that the decay products become increasingly collimated. This reduces the efficacy of conventional reconstruction methods that exploit the topology of the top quark decay chain. We focus on the cases where the decay products of the top quark are reconstructed as a single jet, a “top jet.” The most basic “top-tagging” method based on jet mass measurement is considered in detail. To analyze the feasibility of the top-tagging method, both theoretical and experimental aspects of the large QCD jet background contribution are examined. Based on a factorization approach, we derive a simple analytic approximation for the shape of the QCD jet mass spectrum. We observe very good agreement with the Monte Carlo simulation. We consider high-pT tt¯ production in the standard model as an example, and show that our theoretical QCD jet mass distributions can efficiently characterize the background via sideband analyses. We show that with 25??fb-1 of data, our approach allows us to resolve top jets with pT?1??TeV, from the QCD background, and about 1.5 TeV top jets with 100??fb-1, without relying on b-tagging. To further improve the significance we consider jet shapes (recently analyzed in 10), which resolve the substructure of energy flow inside cone jets. A method of measuring the top quark polarization by using the transverse momentum of the bottom quark is also presented. The main advantages of our approach are (i) the mass distributions are driven by first principle calculations, instead of relying solely on Monte Carlo simulation; (ii) for high pT jets (pT?1??TeV), IR-safe jet shape variables are robust against detector resolution effects. Our analysis can be applied to other boosted massive particles such as the electroweak gauge bosons and the Higgs.

Leandro G. Almeida; Seung J. Lee; Gilad Perez; Ilmo Sung; Joseph Virzi

2009-04-16T23:59:59.000Z

270

Hypersonic Buckshot: Astrophysical Jets as Heterogeneous Collimated Plasmoids  

E-Print Network (OSTI)

Herbig-Haro (HH) jets are commonly thought of as homogeneous beams of plasma traveling at hypersonic velocities. Structure within jet beams is often attributed to periodic or ``pulsed'' variations of conditions at the jet source. Simulations based on this scenario result in knots extending across the jet diameter. Observations and recent high energy density laboratory experiments shed new light on structures below this scale and indicate they may be important for understanding the fundamentals of jet dynamics. In this paper we offer an alternative to ``pulsed'' models of protostellar jets. Using direct numerical simulations we explore the possibility that jets are chains of sub-radial clumps propagating through a moving inter-clump medium. Our models explore an idealization of this scenario by injecting small ($r\\rho_{jet}$) spheres embedded in an otherwise smooth inter-clump jet flow. The spheres are initialized with velocities differing from the jet velocity by $\\sim15$%. We find the consequences of shiftin...

Yirak, Kristopher; Cunningham, Andrew J; Mitran, Sorin

2008-01-01T23:59:59.000Z

271

Figure 2: The mercury jet target geometry. The proton beam and mercury jet cross at z=-37.5 cm.  

E-Print Network (OSTI)

Figure 2: The mercury jet target geometry. The proton beam and mercury jet cross at z=-37.5 cm. Figure 3: The layout of multiple proton beam entry directions relative to mercury jet at z=-75 cm. A PION of a free liquid mercury jet with an intense proton beam. We study the variation of meson production

McDonald, Kirk

272

The JET Project: Introduction and Background  

Science Journals Connector (OSTI)

...magnetic confinement of high-temperature plasma in conditions close to those needed for energy-producing controlled thermonuclear fusion reactors. Physically, JET is a very powerful toroidalpinch electric discharge in a strong stabilizing magnetic...

1987-01-01T23:59:59.000Z

273

Viscosity and jet quenching from holographic model  

E-Print Network (OSTI)

We consider the backreaction of the fundamental flavor degrees of freedom on the AdS$_5$-Schwarz background, and calculate their contributions to the shear viscosity and jet-quenching parameter of the thermal quark-gluon plasma.

Yi-hong Gao; Wei-shui Xu; Ding-fang Zeng

2007-07-05T23:59:59.000Z

274

Feasibility Study for a New Business Jet  

E-Print Network (OSTI)

This report demonstrates details of a feasibility study of a new business jet as an effort to complete the requirements for a field project (EMGT 835) in Engineering Management. The study is conducted during global economic crisis to identify a...

Mousa, Yasser Abdullah

2009-05-15T23:59:59.000Z

275

Inclusive jet cross section at CDF  

SciTech Connect

This contribution reports on preliminary measurements of the inclusive jet production cross section in p{bar p} collisions at {radical}s = 1.96 TeV using data collected with CDF corresponding to an integrated luminosity of 385 pb{sup -1}. Two analyzes are presented: one uses the longitudinally invariant k{sub T} algorithm to reconstruct the jets, the other uses the midpoint algorithm. Both are limited to jets with rapidity in the range 0.1 < |y{sup jet}| < 0.7. The measured cross sections are in good agreement with next-to-leading order perturbative QCD predictions after including the non-perturbative corrections necessary to account for underlying event and hadronization effects.

Lefevre, R.; Martinez, M.; /Barcelona, IFAE

2005-01-01T23:59:59.000Z

276

MULTIWAVELENGTH OBSERVATIONS OF THE SS 433 JETS  

E-Print Network (OSTI)

We present observations of the SS 433 jets using the Chandra High Energy Transmission Grating Spectrometer with contemporaneous optical and Very Long Baseline Array observations. The X-ray and optical emission line regions ...

Canizares, Claude R.

277

The JET Project: Introduction and Background  

Science Journals Connector (OSTI)

...confinement of high-temperature plasma in conditions close to those needed for energy-producing controlled thermonuclear fusion reactors. Physically, JET is a very powerful toroidalpinch electric discharge in a strong stabilizing magnetic...

1987-01-01T23:59:59.000Z

278

Exergy Analysis of a GTL Process Based on Low-Temperature Slurry F-T Reactor Technology with a Cobalt Catalyst  

E-Print Network (OSTI)

Exergy Analysis of a GTL Process Based on Low-Temperature Slurry F-T Reactor Technology of the initial exergy of the gas is used to convert it into liquid fuel. In the present study, we analyze. Next, we use exergy analysis to establish the impact of catalyst selectivity and of thermal losses

Kjelstrup, Signe

279

New results on jet fragmentation at CDF  

SciTech Connect

Presented are the latest results of jet fragmentation studies at the Tevatron using the CDF Run II detector. Studies include the distribution of transverse momenta (Kt) of particles jets, two-particle momentum correlations, and indirectly global event shapes in p{bar p} collisions. Results are discussed within the context of recent Next-to-Leading Log calculations as well as earlier experimental results from the Tevatron and e{sup +}e{sup -} colliders.

Jindariani, Sergo; /Florida U.

2006-12-01T23:59:59.000Z

280

Measuring collinear W emissions inside jets  

E-Print Network (OSTI)

Single and multiple emission of electroweak gauge bosons and in particular of W bosons is discussed in the parton shower language. Algorithms and observables for the reconstruction of both leptonically and hadronically decaying W bosons inside light quark jets are compared, and they are applied to a study of how emission rates of W bosons in light-jet events at the LHC could be measured.

Frank Krauss; Petar Petrov; Marek Schoenherr; Michael Spannowsky

2014-03-19T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Gap between jets at the LHC  

SciTech Connect

We describe a NLL BFKL calculation implemented in the HERWIG MC of the gap between jets cross section, that represent a test of BFKL dynamics. We compare the predictions with recent measurements at the Tevatron and present predictions for the LHC. We also discuss the interesting process of looking for gap between jets in diffractive events when protons are detected in the ATLAS Forward Physics (AFP) detectors.

Royon, Christophe [CEA/IRFU/Service de physique des particules, CEA/Saclay, 91191 Gif-sur-Yvette cedex (France)

2013-04-15T23:59:59.000Z

282

Probing nuclear matter with jet conversions  

SciTech Connect

We discuss the flavor of leading jet partons as a valuable probe of nuclear matter. We point out that the coupling of jets to nuclear matter naturally leads to an alteration of jet chemistry even at high transverse momentum p{sub T}. In particular, quantum chromodynamics (QCD) jets coupling to a chemically equilibrated quark gluon plasma in nuclear collisions will lead to hadron ratios at high transverse momentum p{sub T} that can differ significantly from their counterparts in p+p collisions. Flavor measurements could complement energy loss as a way to study interactions of hard QCD jets with nuclear matter. Roughly speaking they probe the inverse mean free path 1/{lambda} while energy loss probes the average squared momentum transfer {mu}{sup 2}/{lambda}. We present some estimates for the rate of jet conversions in a consistent Fokker-Planck framework and their impact on future high-p{sub T} identified hadron measurements at RHIC and LHC. We also suggest some novel observables to test flavor effects.

Liu, W. [Cyclotron Institute and Department of Physics, Texas A and M University, College Station, Texas 77843 (United States); Fries, R. J. [Cyclotron Institute and Department of Physics, Texas A and M University, College Station, Texas 77843 (United States); RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)

2008-05-15T23:59:59.000Z

283

The Infrared Jet in 3C31  

E-Print Network (OSTI)

We report the detection of infrared emission from the jet of the nearby FR I radio galaxy 3C 31. The jet was detected with the IRAC instrument on Spitzer at 4.5 micron, 5.8 micron, and 8.0 micron out to 30" (13 kpc) from the nucleus. We measure radio, infrared, optical, and X-ray fluxes in three regions along the jet determined by the infrared and X-ray morphology. Radio through X-ray spectra in these regions demonstrate that the emission can be interpreted as synchrotron emission from a broken power-law distribution of electron energies. We find significant differences in the high energy spectra with increasing distance from the nucleus. Specifically, the high energy slope increases from 0.86 to 1.72 from 1 kpc to 12 kpc along the jet, and the spectral break likewise increases in frequency along the jet from 10-100's of GHz to ~20 THz. Thus the ratio of IR to X-ray flux in the jet increases by at least an order of magnitude with increasing distance from the nucleus. We argue that these changes cannot simply ...

Lanz, Lauranne; Kraft, Ralph P; Birkinshaw, Mark; Lal, Dharam V; Forman, William R; Jones, Christine; Worrall, Diana M

2015-01-01T23:59:59.000Z

284

ATLAS jet and missing-ET reconstruction, calibration, and performance  

E-Print Network (OSTI)

The ATLAS experiment has achieved a very high precision on jet and missing transverse energy performance by the use of advanced calorimeter-based topological clustering and local cluster calibration, event-by-event pile-up subtraction methods, and in situ techniques to correct for the residual jet energy response difference between data and simulation. Tracking information is being combined with calorimeter to further improve the jet and missing transverse energy performance. ATLAS has also commissioned several new powerful tools for the analysis and interpretation of hadronic final states at the LHC such as jet substructure, jet mass, quark-gluon discrimination, and jet tagging tools for the identification of boosted heavy particles. An overview of the reconstruction, calibration, and performance of jets, missing transverse energy, jet substructure, and jet tagging at ATLAS is presented.

Berta, P; The ATLAS collaboration

2014-01-01T23:59:59.000Z

285

Durability testing of medium speed diesel engine components designed for operating on coal/water slurry fuel  

SciTech Connect

Over 200 operating cylinder hours were run on critical wearing engine parts. The main components tested included cylinder liners, piston rings, and fuel injector nozzles for coal/water slurry fueled operation. The liners had no visible indication of scoring nor major wear steps found on their tungsten carbide coating. While the tungsten carbide coating on the rings showed good wear resistance, some visual evidence suggests adhesive wear mode was present. Tungsten carbide coated rings running against tungsten carbide coated liners in GE 7FDL engines exhibit wear rates which suggest an approximate 500 to 750 hour life. Injector nozzle orifice materials evaluated were diamond compacts, chemical vapor deposited diamond tubes, and thermally stabilized diamond. Based upon a total of 500 cylinder hours of engine operation (including single-cylinder combustion tests), diamond compact was determined to be the preferred orifice material.

McDowell, R.E.; Giammarise, A.W.; Johnson, R.N.

1994-04-01T23:59:59.000Z

286

Atmospheric-pressure plasma jet  

SciTech Connect

A {gamma}-mode, resonant-cavity plasma discharge that can be operated at atmospheric pressure and near room temperature using 13.56 MHz rf power is described. Unlike plasma torches, the discharge produces a gas-phase effluent no hotter than 250 C at an applied power of about 300 W, and shows distinct non-thermal characteristics. In the simplest design, two concentric cylindrical electrodes are employed to generate a plasma in the annular region there between. A jet of long-lived metastable and reactive species that are capable of rapidly cleaning or etching metals and other materials is generated which extends up to 8 in. beyond the open end of the electrodes. Films and coatings may also be removed by these species. Arcing is prevented in the apparatus by using gas mixtures containing He, which limits ionization, by using high flow velocities, and by properly shaping the rf-powered electrode. Because of the atmospheric pressure operation, no ions survive for a sufficiently long distance beyond the active plasma discharge to bombard a workpiece, unlike low-pressure plasma sources and conventional plasma processing methods.

Selwyn, G.S.

1999-10-05T23:59:59.000Z

287

PHOTOSPHERIC EMISSION FROM STRATIFIED JETS  

SciTech Connect

We explore photospheric emissions from stratified two-component jets, wherein a highly relativistic spine outflow is surrounded by a wider and less relativistic sheath outflow. Thermal photons are injected in regions of high optical depth and propagated until the photons escape at the photosphere. Because of the presence of shear in velocity (Lorentz factor) at the boundary of the spine and sheath region, a fraction of the injected photons are accelerated using a Fermi-like acceleration mechanism such that a high-energy power-law tail is formed in the resultant spectrum. We show, in particular, that if a velocity shear with a considerable variance in the bulk Lorentz factor is present, the high-energy part of observed gamma-ray bursts (GRBs) photon spectrum can be explained by this photon acceleration mechanism. We also show that the accelerated photons might also account for the origin of the extra-hard power-law component above the bump of the thermal-like peak seen in some peculiar bursts (e.g., GRB 090510, 090902B, 090926A). We demonstrate that time-integrated spectra can also reproduce the low-energy spectrum of GRBs consistently using a multi-temperature effect when time evolution of the outflow is considered. Last, we show that the empirical E{sub p}-L{sub p} relation can be explained by differences in the outflow properties of individual sources.

Ito, Hirotaka; Nagataki, Shigehiro; Ono, Masaomi; Lee, Shiu-Hang; Mao, Jirong [Astrophysical Big Bang Laboratory, RIKEN, Saitama 351-0198 (Japan); Yamada, Shoichi [Department of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 (Japan); Pe'er, Asaf [Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Mizuta, Akira [KEK Theory Center, Tsukuba 305-0801 (Japan); Harikae, Seiji, E-mail: hito@yukawa.kyoto-u.ac.jp [Quants Research Department, Financial Engineering Division, Mitsubishi UFJ Morgan Stanley Securities Co., Ltd., Mejirodai Bldg., 3-29-20 Mejirodai, Bunkyo-ku, Tokyo 112-8688 (Japan)

2013-11-01T23:59:59.000Z

288

Jet vetoes versus giant K-factors in the exclusive Z+1-jet cross section  

E-Print Network (OSTI)

The ATLAS measurement of the exclusive $Z$+1-jet cross section shows a surprising agreement with fixed-order predictions in the kinematic region expected to be dominated by large jet-veto logarithms. We identify the explanation for this effect: the jet-isolation criterion implemented by ATLAS allows dijet events where an energetic jet is collinear to a final-state lepton. This process contains a giant K-factor arising from the collinear emission of a Z-boson from the dijet configuration which overwhelms the effect of the jet-veto logarithms. We provide numerical results for 7 TeV, 8 TeV and 14 TeV LHC collisions that demonstrate the interplay between the jet-veto logarithms and the giant K-factor in the theoretical prediction. We suggest an alternate isolation criterion that removes the giant K-factor and allows for a direct test of the jet-veto resummation framework in the Z+1-jet process.

Boughezal, Radja; Liu, Xiaohui

2015-01-01T23:59:59.000Z

289

MULTIWAVELENGTH OBSERVATIONS OF THE SS 433 JETS  

SciTech Connect

We present observations of the SS 433 jets using the Chandra High Energy Transmission Grating Spectrometer with contemporaneous optical and Very Long Baseline Array observations. The X-ray and optical emission line regions are found to be related but not coincident as the optical line emission persists for days while the X-ray emission lines fade in less than 5000 s. The line Doppler shifts from the optical and X-ray lines match well, indicating that they are less than 3 × 10{sup 14} cm apart. The jet Doppler shifts show aperiodic variations that could result from shocks in interactions with the local environment. These perturbations are consistent with a change in jet direction but not jet speed. The proper motions of the radio knots match the kinematic model only if the distance to SS 433 is 4.5 ± 0.2 kpc. Observations during eclipse show that the occulted emission is very hard, seen only above 2 keV and rising to comprise >50% of the flux at 8 keV. The soft X-ray emission lines from the jet are not blocked, constraining the jet length to ?> 2 × 10{sup 12} cm. The base jet density is in the range 10{sup 10-13} cm{sup –3}, in contrast to our previous estimate based on the Si XIII triplet, which is likely to have been affected by UV de-excitation. There is a clear overabundance of Ni by a factor of about 15 relative to the solar value, which may have resulted from an unusual supernova that formed the compact object.

Marshall, Herman L.; Canizares, Claude R.; Schulz, Norbert S.; Nowak, Michael [Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States); Hillwig, Todd [Department of Physics and Astronomy, Valparaiso University, Valparaiso, IN 46383 (United States); Mioduszewski, Amy; Rupen, Michael [NRAO, P.O. Box 2, Socorro, NM 87801 (United States); Heinz, Sebastian, E-mail: hermanm@space.mit.edu, E-mail: crc@space.mit.edu, E-mail: nss@space.mit.edu, E-mail: mnowak@space.mit.edu, E-mail: todd.hillwig@valpo.edu, E-mail: amiodusz@nrao.edu, E-mail: mrupen@aoc.nrao.edu, E-mail: heinzs@astro.wisc.edu [Astronomy Department, 5408 Sterling Hall, University of Wisconsin, Madison, WI 53706 (United States)

2013-09-20T23:59:59.000Z

290

A Search for Jet Handedness in Hadronic $Z^0$ Decays  

E-Print Network (OSTI)

We have searched for signatures of polarization in hadronic jets from $Z^0 \\to q \\bar{q}$ decays using the ``jet handedness'' method. The polar angle asymmetry induced by the high SLC electron-beam polarization was used to separate quark jets from antiquark jets, expected to be left- and right-polarized, respectively. We find no evidence for jet handedness in our global sample or in a sample of light quark jets and we set upper limits at the 95% C.L. of 0.063 and 0.099 respectively on the magnitude of the analyzing power of the method proposed by Efremov {\\it et al.}

K. Abe

1995-01-13T23:59:59.000Z

291

The minimum jet power and equipartition  

E-Print Network (OSTI)

We derive the minimum power of jets and their magnetic field strength based on their observed non-thermal synchrotron emission. The correct form of this method takes into account both the internal energy in the jet and the ion rest-mass energy associated with the bulk motion. The latter was neglected in a number of papers, which instead adopted the well-known energy-content minimization method. That method was developed for static sources, for which there is no bulk-motion component of the energy. In the case of electron power-law spectra with index >2 in ion-electron jets, the rest-mass component dominates. The minimization method for the jet power taking it into account was considered in some other work, but only based on either an assumption of a constant total synchrotron flux or a fixed range of the Lorentz factors. Instead, we base our method on an observed optically-thin synchrotron spectrum. We find the minimum jet power is independent of its radius when the rest-mass power dominates, which becomes th...

Zdziarski, Andrzej A

2014-01-01T23:59:59.000Z

292

HEFA and Fischer-Tropsch Jet Fuel Cost Analyses | Department...  

Energy Savers (EERE)

HEFA and Fischer-Tropsch Jet Fuel Cost Analyses HEFA and Fischer-Tropsch Jet Fuel Cost Analyses This is a presentation from the November 27, 2012, Sustainable Alternative Fuels...

293

Images in Emergency Medicine: Irritant Contact Dermatitis from Jet Fuel  

E-Print Network (OSTI)

and penetration of JP-8 jet fuel and its components. Toxicoland other kerosene-based fuels have been shown to cause skinContact Dermatitis from Jet Fuel Christopher C. Trigger, MD

Trigger, Christopher C; Eilbert, Wesley

2009-01-01T23:59:59.000Z

294

A study of the self-oscillating jet impingement nozzle  

E-Print Network (OSTI)

wave and flow fluctuations that need no external input. The new oscillating jet when used for impingement surface transport was labeled the Self-Oscillating Jet Impingement Nozzle. The objectives of this research were to characterize the gains in heat...

Chinnock, Paul Scott

1993-01-01T23:59:59.000Z

295

Applications of Underexpanded Jets in Hypersonic Aerothermodynamics Research  

E-Print Network (OSTI)

Applications of Underexpanded Jets in Hypersonic Aerothermodynamics Research Vladimir V. Riabov Abstract. A method of underexpanded hypersonic viscous jets has been developed to acquire experimental parameters are revealed. In the case of hypersonic stabilization, the Reynolds number and temperature factor

Riabov, Vladimir V.

296

ATLAS jet and missing ET reconstruction, calibration, and performance  

E-Print Network (OSTI)

ATLAS has achieved a very high precision on jet and missing transverse energy performance by the use of advanced calorimeter-based topological clustering and local cluster calibration, event-by-event pile-up subtraction methods, and in situ techniques to correct for the residual jet energy response difference between data and simulation. Tracking information is being combined with calorimeter to further improve the jet and missing ET performance. ATLAS has also commissioned several new powerful tools for for the analysis and interpretation of hadronic final states at the LHC such as jet substructure, jet mass, quark-gluon discrimination, and jet tagging tools for the identification of boosted heavy particles. An overview of the reconstruction, calibration and performance of jets, missing ET, and jet substructure and tagging at ATLAS is presented.

Crispin Ortuzar, M; The ATLAS collaboration

2014-01-01T23:59:59.000Z

297

Strategic Control of Transverse Jet Shear Layer Instabilities J. Davitian,  

E-Print Network (OSTI)

to the injection wall are considered. These studies develop a strategy for control based on separate experimental engines, dilution jet injection in gas turbine combustors, thrust vectoring jets, and turbine blade film

M'Closkey, Robert T.

298

Active noise control of supersonic impinging jet using pulsed microjets  

E-Print Network (OSTI)

This thesis concerns an active noise control of supersonic impinging jet flow using unsteady microjet injection. Supersonic impinging jet involves several problems such as lift loss, ground erosion, significant noise ...

Hong, Seung Hyuck

2009-01-01T23:59:59.000Z

299

Feedback control of flow separation using synthetic jets  

E-Print Network (OSTI)

The primary goal of this research is to assess the effect of synthetic jets on flow separation and provide a feedback control strategy for flow separation using synthetic jets. The feedback control synthesis is conducted based upon CFD simulation...

Kim, Kihwan

2006-04-12T23:59:59.000Z

300

Mixing enhancement by use of swirling jets  

SciTech Connect

It has been proposed that the mixing of fuel with air in the combustor of scramjet engines might be enhanced by the addition of swirl to the fuel jet prior to injection. This study investigated the effects of swirl on the mixing of a 30 deg wall jet into a Mach 2 flow. Cases with swirl and without swirl were investigated, with both helium and air simulating the fuel. Rayleigh scattering was used to visualize the flow, and seeding the fuel with water allowed it to be traced through the main flow. The results show that the addition of swirl to the fuel jet causes the fuel to mix more rapidly with the main flow, that larger amounts of swirl increase this effect, and that helium spreads better into the main flow than air. 12 refs.

Kraus, D.K.; Cutler, A.D.

1993-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Constraints from jet calculus on quark recombination  

Science Journals Connector (OSTI)

Within the quantum-chromodynamic jet-calculus formalism, we deduce an equation describing recombination of quarks and antiquarks into mesons within a quark or gluon jet. This equation relates the recombination function R(x1,x2,x) used in current literature to the fragmentation function for producing that same meson out of the parton initiating the jet. We submit currently used recombination functions to our consistency test, taking as input mainly the u-quark fragmentation "data" into ?+ mesons. The qq¯?? recombination functions popular in the literature are consistent with measured fragmentation functions, but they must be supplemented by other contributions to provide the full Du?+. We also discuss the Q2 dependence of the resulting fragmentation functions.

L. M. Jones; K. E. Lassila; U. Sukhatme; D. Willen

1981-02-01T23:59:59.000Z

302

3-D GRMHD Simulations of Generating Jets  

E-Print Network (OSTI)

We have performed a first fully 3-D GRMHD simulation with Schwarzschild black hole with a free falling corona. The initial simulation results show that a jet is created as in the previous simulations using the axisymmetric geometry with the mirror symmetry at the equator. However, the time to generate the jet is longer than in the 2-D axisymmetric simulations. We expect that due to the additional freedom in the azimuthal dimension without axisymmetry with respect to the z axis and reflection symmetry with respect to the equatorial plane, the dynamics of jet formation can be modified. Further simulations are required for the study of instabilities along the azimuthal direction such as accretion-eject instability

Nishikawa, K I; Shibata, K; Kudoh, T; Sol, H

2002-01-01T23:59:59.000Z

303

3-D GRMHD Simulations of Generating Jets  

E-Print Network (OSTI)

We have performed a first fully 3-D GRMHD simulation with Schwarzschild black hole with a free falling corona. The initial simulation results show that a jet is created as in the previous simulations using the axisymmetric geometry with the mirror symmetry at the equator. However, the time to generate the jet is longer than in the 2-D axisymmetric simulations. We expect that due to the additional freedom in the azimuthal dimension without axisymmetry with respect to the z axis and reflection symmetry with respect to the equatorial plane, the dynamics of jet formation can be modified. Further simulations are required for the study of instabilities along the azimuthal direction such as accretion-eject instability

K. -I. Nishikawa; S. Koide; K. Shibata; T. Kudoh; H. Sol

2002-08-05T23:59:59.000Z

304

On the Misalignment of Jets in Microquasars  

E-Print Network (OSTI)

We discuss the timescales for alignment of black hole and accretion disc spins in the context of binary systems. We show that for black holes that are formed with substantial angular momentum, the alignment timescales are likely to be at least a substantial fraction of the systems' lifetimes. This result explains the observed misalignment of the disc and the jet in the microquasar GRO J 1655-40 and in SAX J 1819-2525 as being likely due to the Bardeen-Petterson effect. We discuss the implications of these results on the mass estimate for GRS 1915+105, which has assumed the jet is perpendicular to the orbital plane of the system and may hence be an underestimate. We show that the timescales for the spin alignment in Cygnus X-3 are consistent with the likely misalignment of disc and jet in that system, and that this is suggested by the observational data.

Thomas J. Maccarone

2002-09-05T23:59:59.000Z

305

INVESTIGATING SUSPENSION OF MST, CST, AND SIMULATED SLUDGE SLURRIES IN A PILOT-SCALE WASTE TANK  

SciTech Connect

The Small Column Ion Exchange (SCIX) process is being developed to remove cesium, strontium, and actinides from Savannah River Site (SRS) Liquid Waste using an existing waste tank (i.e., Tank 41H) to house the process. Savannah River National Laboratory (SRNL) is conducting pilot-scale mixing tests to determine the pump requirements for suspending and resuspending monosodium titanate (MST), crystalline silicotitanate (CST), and simulated sludge. The purpose of this pilot scale testing is for the pumps to resuspend the MST, CST, and simulated sludge particles so that they can be removed from the tank, and to suspend the MST so it can contact strontium and actinides. The pilot-scale tank is a 1/10.85 linear scaled model of Tank 41H. The tank diameter, tank liquid level, pump nozzle diameter, pump elevation, and cooling coil diameter are all 1/10.85 of their dimensions in Tank 41H. The pump locations correspond to the proposed locations in Tank 41H by the SCIX program (Risers B5, B3, and B1). Previous testing showed that three Submersible Mixer Pumps (SMPs) will provide sufficient power to initially suspend MST in an SRS waste tank, and to resuspend MST that has settled in a waste tank at nominal 45 C for four weeks. The conclusions from this analysis are: (1) Three SMPs will be able to resuspend more than 99.9% of the MST and CST that has settled for four weeks at nominal 45 C. The testing shows the required pump discharge velocity is 84% of the maximum discharge velocity of the pump. (2) Three SMPs will be able to resuspend more than 99.9% of the MST, CST, and simulated sludge that has settled for four weeks at nominal 45 C. The testing shows the required pump discharge velocity is 82% of the maximum discharge velocity of the pump. (3) A contact time of 6-12 hours is needed for strontium sorption by MST in a jet mixed tank with cooling coils, which is consistent with bench-scale testing and actinide removal process (ARP) operation.

Poirier, M.; Qureshi, Z.; Restivo, M.; Steeper, T.; Williams, M.

2011-05-24T23:59:59.000Z

306

On the Counter-jet Emission in GRB Afterglows  

SciTech Connect

We investigate the dynamical evolution of double-sided jets and present detailed numerical studies on the emission from the receding jet of gamma-ray bursts. It is found that the receding jet emission is generally very weak and only manifests as a plateau in the late time radio afterglow light curves. Additionally, we find that the effect of synchrotron self-absorption can influence the peak time of the receding jet emission significantly.

Wang Xin; Huang, Y. F. [Department of Astronomy, Nanjing University, Nanjing 210093 (China)

2010-10-15T23:59:59.000Z

307

IR diagnostics of embedded jets: velocity resolved observations of the HH34 and HH1 jets  

E-Print Network (OSTI)

We present VLT-ISAAC medium resolution spectroscopy of the HH34 and HH1 jets. Our aim is to derive the kinematics and the physical parameters and to study how they vary with jet velocity. We use several important diagnostic lines such as [FeII] 1.644um, 1.600um and H2 2.122um. In the inner jet region of HH34 we find that both the atomic and molecular gas present two components at high and low velocity. The [FeII] LVC in HH34 is detected up to large distances from the source (>1000 AU), at variance with TTauri jets. In H2 2.122um, the LVC and HVC are spatially separated. We detect, for the first time, the fainter red-shifted counterpart down to the central source. In HH1, we trace the jet down to ~1" from the VLA1 driving source: the kinematics of this inner region is again characterised by the presence of two velocity components, one blue-shifted and one red-shifted with respect to the source LSR velocity. In the inner HH34 jet region, ne increases with decreasing velocity. Up to ~10" from the driving source, and along the whole HH1 jet an opposite behaviour is observed instead, with ne increasing with velocity. In both jets the mass flux is carried mainly by the high-velocity gas. A comparison between the position velocity diagrams and derived electron densities with models for MHD jet launching mechanisms has been performed for HH34. While the kinematical characteristics of the line emission at the jet base can be, at least qualitatively, reproduced by both X-winds and disc-wind models, none of these models can explain the extent of the LVC and the dependence of electron density with velocity that we observe. It is possible that the LVC in HH34 represents gas not directly ejected in the jet but instead denser ambient gas entrained by the high velocity collimated jet.

R. Garcia Lopez; B. Nisini; T. Giannini; J. Eisloeffel; F. Bacciotti; L. Podio

2008-05-19T23:59:59.000Z

308

Heavy quarks in the jet calculus  

Science Journals Connector (OSTI)

In this paper we explore a method for treating heavy quarks such as c and b quarks within the jet calculus. These quarks are differentiated from the more common u, d, and s quarks by the requirement that the gluons never branch into heavy-quark pairs during the jet development. We compute and discuss the charmed-quark "propagators"; the x distribution of colorless clusters containing a charmed quark, a noncharmed antiquark, and gluons; and the mass distribution of the parent partons giving rise to these colorless clusters.

L. M. Jones

1983-07-01T23:59:59.000Z

309

Jet energy flow at the LHC  

Science Journals Connector (OSTI)

We present a quantitative study of energy flow away from jets by numerically solving the evolution equation derived by Banfi, Marchesini, and Smye, and apply the result to two processes at the LHC: discriminating high-pt jets originating from decays of heavy electroweak bosons from the QCD background, and the survival probability of the BFKL-initiated dijet rapidity gaps. As a by-product, we find a hidden symmetry of the Banfi, Marchesini, and Smye equation which is a remnant of conformal symmetry.

Yoshitaka Hatta and Takahiro Ueda

2009-10-19T23:59:59.000Z

310

Gaseous Jets in Comet Hale-Bopp (1995 O1)  

Science Journals Connector (OSTI)

We report the identification of gas jets in comet Hale-Bopp in OH, NH, CN, C2 and C3. This is the first time OH and NH jets without an obvious optical dust jet counterpart have been identified in narrowband comet...

Susan M. Lederer; Humberto Campins; David J. Osip…

311

Large Eddy Simulations of Jet Flow Interactions Within Rod Bundles  

E-Print Network (OSTI)

The present work investigates the turbulent jet flow mixing of downward impinging jets within a staggered rod bundle based on previous experimental work. The two inlet jets had Reynold's numbers of 11,160 and 6,250 and were chosen to coincide...

Salpeter, Nathaniel O.

2010-07-14T23:59:59.000Z

312

WASHING AND DEMONSTRATION OF THE DWPF FLOWSHEET IN THE SRNL SHIELDED CELLS USING POST ALUMINUM DISSOLUTION TANK 51 SLUDGE SLURRY  

SciTech Connect

The remaining contents of Tank 51 from Sludge Batch 4 will be blended with Purex sludge from Tank 7 to constitute Sludge Batch 5 (SB5). The Savannah River Site (SRS) Liquid Waste Organization (LWO) has completed caustic addition to Tank 51 to perform low temperature Al dissolution on the H-Modified (HM) sludge material to reduce the total mass of sludge solids and Al being fed to the Defense Waste Processing Facility (DWPF). The Savannah River National Lab (SRNL) has also completed aluminum dissolution tests using a 3-L sample of Tank 51 sludge slurry through funding by DOE EM-21. This report documents assessment of downstream impacts of the aluminum dissolved sludge, which were investigated so technical issues could be identified before the start of SB5 processing. This assessment included washing the aluminum dissolved sludge to a Tank Farm projected sodium concentration and weight percent insoluble solids content and DWPF Chemical Process Cell (CPC) processing using the washed sludge. Based on the limited testing, the impact of aluminum dissolution on sludge settling is not clear. Settling was not predictable for the 3-L sample. Compared to the post aluminum dissolution sample, settling after the first wash was slower, but settling after the second wash was faster. For example, post aluminum dissolution sludge took six days to settle to 60% of the original sludge slurry height, while Wash 1 took nearly eight days, and Wash 2 only took two days. Aluminum dissolution did impact sludge rheology. A comparison between the as-received, post aluminum dissolution and washed samples indicate that the downstream materials were more viscous and the concentration of insoluble solids less than that of the starting material. This increase in viscosity may impact Tank 51 transfers to Tank 40. The impact of aluminum dissolution on DWPF CPC processing cannot be determined because acid addition for the Sludge Receipt and Adjustment Tank (SRAT) cycle was under-calculated and thus under-added. Although the sludge was rheologically thick throughout the SRAT and Slurry Mix Evaporator (SME) cycles, this may have been due to the under addition of acid. Aluminum dissolution did, however, impact analyses of the SRAT receipt material. Two methods for determining total base yielded significantly different results. The high hydroxide content and the relatively high soluble aluminum content of the washed post aluminum dissolution sludge likely contributed to this difference and the ultimate under addition of acid. It should be noted that the simulant used to provide input for the SRAT cycle was an inadequate representation of the waste in terms of acid demand, likely due to the differences in the form of aluminum and hydroxide in the simulant and actual waste. Based on the results of this task, it is recommended that: (1) Sludge settling and rheology during washing of the forthcoming Sludge Batch 5 qualification sample be monitored closely and communicated to the Tank Farm. (2) SRNL receive a sample of Tank 51 after all chemical additions have been made and prior to the final Sludge Batch 5 decant for rheological assessment. Rheology versus wt% insoluble solids will be performed to determine the maximum amount of decant prior to the Tank 51 to Tank 40 transfer. (3) As a result of the problem with measuring total base and subsequently under-calculating acid for the DWPF CPC processing of the post aluminum dissolution sludge; (4) Studies to develop understanding of how the sludge titrates (i.e., why different titration methods yield different results) should be performed. (5) Simulants that better match the properties of post aluminum dissolution sludge should be developed. (6) Work on developing an acid calculation less dependant on the total base measurement should be continued.

Pareizs, J; Cj Bannochie, C; Damon Click, D; Erich Hansen, E; Dan Lambert, D; Michael Stone, M

2008-04-28T23:59:59.000Z

313

Slurry Nebulization-Inductively Coupled Plasma Mass Spectrometry with Solution Calibration for Determination of Ultratrace Boron in High Pure Nuclear Graphite Powder  

Science Journals Connector (OSTI)

Slurry nebulization-inductively coupled plasma mass spectrometry (ICP-MS) was developed for the direct determination of trace boron (B) in high-purity graphite powders. After the graphite powders were ground and sifted, the particle size of graphite was collected less than 5 ?m. Polyvinylpyrrolidone (PVP) was used as the dispersant in slurry preparation. The optimal mass ratio of PVP to the graphite was found to be 0.5. Well-proportioned and stable slurry solution was obtained by magnetic stirrer. 0.1 M NH4OH as the aqueous medium could provide the optimal pH of 10 for the stable slurry and eliminate the memory effect of B. ICP-MS was operated in a higher resolution mode (0.6 amu) to eliminate the interference with the matrix 12C by peak tailing. Oxygen was added into the plasma at a flow rate of 60 mL min?1 to resolve carbon deposition on the sampler and skimmer cones and accelerate particle dissociation in the plasma. External calibration with aqueous solution standards was established for quantification. Beryllium was chosen as the internal standard to evaluate the efficiency of matrix effect correction. A correlation coefficient of 0.9995 was obtained for B concentration ranging 2–200 ?g L?1. The detection limit (3S) of B was 0.095 ?g g?1. As a practical application, the proposed method was used for the determination of trace B in four nuclear graphite samples (claimed 99.999% purity), with the satisfactory recoveries for the spike tests in the range of 97.2%–103.1%.

Xin-Li LIU; Tai-Cheng DUAN; Yi HAN; Xiao-Yu JIA; Wei-Na ZHANG; Hang-Ting CHEN

2010-01-01T23:59:59.000Z

314

Preliminary Study Using ForwardPreliminary Study Using Forward Reaction Control System JetsReaction Control System Jets  

E-Print Network (OSTI)

Preliminary Study Using ForwardPreliminary Study Using Forward Reaction Control System JetsReaction Control System Jets During Space Shuttle EntryDuring Space Shuttle Entry Carolina Restrepo Currently the shuttle uses only aft RCS jets for yaw control during entry Enough to handle present flight

Valasek, John

315

A Novel Jet Model: Magnetically Collimated, Radiation-Pressure Driven Jet  

Science Journals Connector (OSTI)

......reminiscent of nonradiative MHD jets (Lynden-Bell 1996...luminosity-hardness ratio diagram, and reported evolutionary paths in the diagram. More importantly, they found...Recent general-relativistic MHD simulations can indeed achieve......

Shun Takeuchi; Ken Ohsuga; Shin Mineshige

2010-10-25T23:59:59.000Z

316

Mechanism of current redistribution between jets in a double-jet electric arc  

Science Journals Connector (OSTI)

Characteristics of a double-jet electric arc have been determined by numerical simulation of ... plasma electrodes, along which the character of arc discharge changes from self-sustained to non-self-...

E. B. Kulumbaev; T. B. Nikulicheva

2013-01-01T23:59:59.000Z

317

HYPERSONIC BUCKSHOT: ASTROPHYSICAL JETS AS HETEROGENEOUS COLLIMATED PLASMOIDS  

SciTech Connect

Herbig-Haro jets are commonly thought of as homogeneous beams of plasma traveling at hypersonic velocities. Structure within jet beams is often attributed to periodic or 'pulsed' variations of conditions at the jet source. Simulations based on this scenario result in knots extending across the jet diameter. Observations and recent high energy density laboratory experiments shed new light on structures below this scale and indicate they may be important for understanding the fundamentals of jet dynamics. In this paper, we offer an alternative to 'pulsed' models of protostellar jets. Using direct numerical simulations we explore the possibility that jets are chains of subradial clumps propagating through a moving interclump medium. Our models explore an idealization of this scenario by injecting small (r < r {sub jet}), dense ({rho}>{rho}{sub jet}) spheres embedded in an otherwise smooth interclump jet flow. The spheres are initialized with velocities differing from the jet velocity by {approx}15%. We find that the consequences of shifting from homogeneous to heterogeneous flows are significant as clumps interact with each other and with the interclump medium in a variety of ways. Structures which mimic what is expected from pulsed-jet models can form, as can be previously unseen, 'subradial' behaviors including backward facing bow shocks and off-axis working surfaces. While these small-scale structures have not been seen before in simulation studies, they are found in high-resolution jet observations. We discuss implications of our simulations for the interpretation of protostellar jets with regard to characterization of knots by a 'lifetime' or 'velocity history' approach as well as linking observed structures with central engines which produce the jets.

Yirak, Kristopher; Frank, Adam; Cunningham, Andrew J. [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14620 (United States); Mitran, Sorin [Department of Mathematics, Applied Mathematics Program, University of North Carolina, Chapel Hill, NC 27599 (United States)], E-mail: yirak@pas.rochester.edu

2009-04-20T23:59:59.000Z

318

Oxidation of Slurry Aluminide Coatings on Cast Stainless Steel Alloy CF8C-Plus at 800oC in Water Vapor  

SciTech Connect

A new, cast austenitic stainless steel, CF8C-Plus, has been developed for a wide range of high temperature applications, including diesel exhaust components, turbine casings and turbocharger housings. CF8C-Plus offers significant improvements in creep rupture life and creep rupture strength over standard CF8C steel. However, at higher temperatures and in more aggressive environments, such as those containing significant water vapor, an oxidation-resistant protective coating will be necessary. The oxidation behavior of alloys CF8C and CF8C-Plus with various aluminide coatings were compared at 800oC in air plus 10 vol% water vapor. Due to their affordability, slurry aluminides were the primary coating system of interest, although chemical vapor deposition (CVD) and pack cementation coatings were also compared. Additionally, a preliminary study of the low cycle fatigue behavior of aluminized CF8C-Plus was conducted at 800oC. Each type of coating provided substantial improvements in oxidation behavior, with simple slurry aluminides showing very good oxidation resistance after 4,000 h testing in water vapor. Preliminary low cycle fatigue results indicated that thicker aluminide coatings degraded high temperature fatigue properties of CF8C-Plus, whereas thinner coatings did not. Results suggest that appropriately designed slurry aluminide coatings are a viable option for economical, long-term oxidation protection of austenitic stainless steels in water vapor.

Haynes, James A [ORNL; Armstrong, Beth L [ORNL; Dryepondt, Sebastien N [ORNL; Kumar, Deepak [ORNL; Zhang, Ying [Tennessee Technological University

2013-01-01T23:59:59.000Z

319

JET PROPULSION LABORATORY 1979 Annual Report  

E-Print Network (OSTI)

, is the most active and complex volcanic body in our solar system and has a surface composed primarily of Technology and the National Aeronautics and Space Administration for the period January 1 to December 31 JPL Technology Institutional Activities JET PROPULSION LABORATORY California Institute of Technology

Waliser, Duane E.

320

Radio jets from stellar tidal disruptions  

Science Journals Connector (OSTI)

......nl A star that passes too close to a massive...time-dependent accretion rate. We apply this model...predict the snapshot rate of these events...accretion|black hole physics|galaxies: jets...predicted snapshot rate, we conclude that...lofar.org 3 www.physics.usyd.edu.au......

Sjoert van Velzen; Elmar Körding; Heino Falcke

2011-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

NLO Vector Boson Production With Light Jets  

SciTech Connect

In this contribution we present recent progress in the computation of next-to-leading order (NLO) QCD corrections for the production of an electroweak vector boson in association with jets at hadron colliders. We focus on results obtained using the virtual matrix element library BlackHat in conjunction with SHERPA, focusing on results relevant to understanding the background to top production. The production of a vector boson in association with several jets at the Large Hadron Collider (LHC) is an important background for other Standard Model processes as well as new physics signals. In particular, the production of a W boson in association with many jets is an important background for processes involving one or more top quarks. Precise predictions for the backgrounds are crucial to measurement of top-quark processes. Vector boson production in association with multiple jets is also a very important background for many SUSY searches, as it mimics the signatures of many typical decay chains. Here we will discuss how polarization information can be used as an additional handle to differentiate top pair production from 'prompt' W-boson production. More generally, ratios of observables, for example for events containing a W boson versus those containing a Z boson, are expected to be better-behaved as many uncertainties cancel in such ratios. Precise calculation of ratios, along with measurement of one of the two processes in the ratio, can be used in data-driven techniques for estimating backgrounds.

Bern, Z.; Diana, G.; Dixon, L.J.; Febres Cordero, F.; Forde, D.; Gleisberg, T.; Hoeche, S.; Ita, H.; Kosower, D.A.; Maitre, D.; Ozeren, K.

2012-02-15T23:59:59.000Z

322

Models comparison for JET polarimeter data  

SciTech Connect

A complete comparison between the theory and the measurements in polarimetry was done by using the Far Infrared Polarimeter at JET. More than 300 shots were analyzed, including a wide spectrum of JET scenarios in all critical conditions for polarimetry: high density, high and very low fields, high temperatures.This work is aimed at the demonstration of the robustness of the theoretical models for the JET polarimeter measurements in the perspective of using these models for ITER like plasma scenarios . In this context, an assessment was performed on how the line-integrated plasma density along the central vertical chord of FIR polarimeter could be evaluated using the Cotton-Mouton effect and its possible concrete use to correct fringe jumps of the interferometer.The models considered are: i) the rigorous numerical solution of the Stokes propagation equations, using dielectric tensor evaluated from JET equilibrium and Thomson scattering [1,2]; ii) two types of approximated solutions [2,3] and iii) the Guenther empirical model [4] that considers the mutual effect between Cotton-Mouton and Faraday rotation angle. The model calculations have been compared with polarimeter measurements for the Cotton-Mouton phase shift.The agreement with theory is satisfactory within the limits of experimental errors [3].

Mazzotta, C.; Orsitto, F. P.; Giovannozzi, E. [Centro Ricerche Energia Frascati, Euratom-ENEA Association, Frascati (Italy); Boboc, A.; Tudisco, O.; Zabeo, L. [Association EURATOM-UKAEA Culham Science Centre Abingdon 0X14 3DB (UK) (United Kingdom); Brombin, M.; Murari, A. [Consorzio RFX, Euratom-ENEA Association, Padova (Italy)

2008-03-12T23:59:59.000Z

323

HOT ELECTROMAGNETIC OUTFLOWS. II. JET BREAKOUT  

SciTech Connect

We consider the interaction between radiation, matter, and a magnetic field in a compact, relativistic jet. The entrained matter accelerates outward as the jet breaks out of a star or other confining medium. In some circumstances, such as gamma-ray bursts (GRBs), the magnetization of the jet is greatly reduced by an advected radiation field while the jet is optically thick to scattering. Where magnetic flux surfaces diverge rapidly, a strong outward Lorentz force develops and radiation and matter begin to decouple. The increase in magnetization is coupled to a rapid growth in Lorentz factor. We take two approaches to this problem. The first examines the flow outside the fast magnetosonic critical surface, and calculates the flow speed and the angular distribution of the radiation field over a range of scattering depths. The second considers the flow structure on both sides of the critical surface in the optically thin regime, using a relaxation method. In both approaches, we find how the terminal Lorentz factor and radial profile of the outflow depend on the radiation intensity and optical depth at breakout. The effect of bulk Compton scattering on the radiation spectrum is calculated by a Monte Carlo method, while neglecting the effects of internal dissipation. The peak of the scattered spectrum sits near the seed peak if radiation pressure dominates the acceleration, but is pushed to a higher frequency if the Lorentz force dominates. The unscattered seed radiation can form a distinct, low-frequency component of the spectrum, especially if the magnetic Poynting flux dominates.

Russo, Matthew [Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7 (Canada); Thompson, Christopher [Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, ON M5S 3H8 (Canada)

2013-08-20T23:59:59.000Z

324

Exploring jet-launching conditions for SFXTs  

E-Print Network (OSTI)

In the magneto-centrifugal mechanism for jet formation, accreting neutron stars are assumed to produce relativistic jets only if their surface magnetic field is weak enough ($B \\sim 10^8$ G). However, the most common manifestation of neutron stars are pulsars, whose magnetic field distribution peaks at $B \\sim 10^{12}$ G. If the neutron star magnetic field has at least this strength at birth, it must decay considerably before jets can be launched in binary systems. We study the magnetic field evolution of a neutron star that accretes matter from the wind of a high-mass stellar companion so that we can constrain the accretion rate and the impurities in the crust, which are necessary conditions for jet formation. We solved the induction equation for the diffusion and convection of the neutron star magnetic field confined to the crust, assuming spherical accretion in a simpliflied one-dimensional treatment. We incorporated state-of-the-art microphysics, including consistent thermal evolution profiles, and assume...

García, Federico; Romero, Gustavo E

2014-01-01T23:59:59.000Z

325

The Rapidity Dependence of Jet Quenching  

E-Print Network (OSTI)

The suppression of high transverse momentum (P_T) jets and hadrons in ultrarelativistic heavy-ion collisions with respect to a p-p baseline in terms of the nuclear suppression factor R_AA is one of the key observables to gauge the density of a hot and dense QCD medium. However, the suppression measured by R_AA is not a straightforward measure of the medium properties, the value of the observable also depends on the ratio of quark to gluon jets and on the slope of the hard parton spectrum, which explains why R_AA is found to be fairly similar at RHIC and LHC despite the very different dynamics. Measuring high P_T jets and hadrons at forward rapidity offers the same possibility of varying medium density, parton mixture and spectral slope without the need to compare across different sqrt(s) and experiments. In this work, the well-tested jet quenching Monte-Carlo (MC) framework YaJEM is utilized to compute the rapidity dependence of R_AA for three test cases.

Thorsten Renk

2014-06-26T23:59:59.000Z

326

The interaction between two radial jets  

E-Print Network (OSTI)

on an impingement surface with high surface heat and mass transfer. The objective of this study was to characterize the flow, surface pressure, and heat transfer for two radial jets as a function of nozzle geometry, in order to be able to design arrays of radial...

Gruber, Thomas Clifton

2012-06-07T23:59:59.000Z

327

JET and the Prospect for Nuclear Fusion  

Science Journals Connector (OSTI)

This paper describes the Joint European Torus (JET) device which was built as a European collaboration effort, with the aim of testing the scientific feasibility of producing controlled thermonuclear reactions between light nuclei with a net yield of energy. JET is the largest magnetic confinement machine in the world both in physical size and in the magnitude of the plasma current (5 ? 106 Amperes). The machine came into operation in mid-1983 and has followed the first stages of a planned evolution, in which the performance is progressively increased mainly by adding more heating power and which will culminate in eventual operation in a deuterium-tritium mixture. This will permit study of the plasma performance when there is a substantial power input from the ?-particle fusion products. So far operating in deuterium gas with 8 MW of additional heating by neutral beams, a peak ion temperature of 12 keV has been obtained with a corresponding fusion product (density ? confinement time) of 8 ? 1018 m-3 s. If the same conditions were to be achieved in a deuterium-tritium mixture, then the ratio of thermonuclear power output to the heating power input, Q, would be ~ 0.1. It is expected that following further technical improvements to JET, "scientific breakthrough" (namely Q = 1) will be achieved. The next step after JET will be to study a burning or ignited plasma in which no power input is required because energy losses are balanced by ?-particle heating. The requirements for such an experiment will become increasingly clear as more data is obtained from JET. At present it seems likely that a larger apparatus will be needed with a plasma current capability of 12-15 MA. These requirements for the thermonuclear furnace remain broadly consistent with the known technological constraints on an eventual power reactor.

R J Bickerton

1988-01-01T23:59:59.000Z

328

RESULTS FOR THE MAY 19, 2010 INADVERTENT TRANSFER TO THE SALTSTONE DISPOSAL FACILITY SLURRY: SAMPLE ANALYTICAL RESULTS  

SciTech Connect

This report details the chemical analysis results for the characterization of the May 19, 2010 inadvertent transfer from the Saltstone Production Facility (SPF) to the Saltstone Disposal Facility (SDF). On May 19, 2010, the Saltstone Processing Facility (SPF) inadvertently transferred approximately 1800 gallons of untreated low-level salt solution from the salt feed tank (SFT) to Cell F of Vault 4. The transfer was identified and during safe configuration shutdown, approximately 70 gallons of SFT material was left in the Saltstone hopper. After the shutdown, the material in the hopper was undisturbed, while the SFT has received approximately 1400 gallons of drain water from the Vault 4 bleed system. The drain water path from Vault 4 to the SFT does not include the hopper (Figure 1); therefore it was determined that the material remaining in the hopper was the most representative sample of the salt solution transferred to the vault. To complete item No.5 of Reference 1, Savannah River National Laboratory (SRNL) was asked to analyze the liquid sample retrieved from the hopper for pH, and metals identified by the Resource Conservation and Recovery Act (RCRA). SRNL prepared a report to complete item No.5 and determine the hazardous nature of the transfer. Waste Solidification Engineering then instructed SRNL to provide a more detailed analysis of the slurried sample to assist in the determination of the portion of Tank 50 waste in the hopper sample.

Reigel, M.; Cozzi, A.

2010-08-17T23:59:59.000Z

329

Inclusion of the variability of diffuse pollutions in LCA for agriculture: the case of slurry application techniques  

Science Journals Connector (OSTI)

\\{LCAs\\} (life cycle assessments) are often based on average data to produce a generic evaluation of a good or service. However, ignoring variability and induced uncertainty of LCA results reduces their significance, especially when dealing with agricultural processes that present high natural fluctuations. The objective of the study was to explore the robustness of LCA results when accounting for variable emissions data, illustrated by the case of slurry application techniques. Four application techniques were compared: band spreading, broadcast spreading, harrowing after surface application and direct injection. On the basis of the normalisation results, acidification, eutrophication and global warming potentials were selected. To estimate field nitrogen emissions, an original approach was developed based on relative nitrogen loss factors for each technique from a literature review. The calculated field emissions from different soil and climate conditions were considered equally probable and were propagated into a range of LCA result using the Monte Carlo method. Injection and harrowing both showed reduced acidification and eutrophication potentials compared to band spreading and broadcast spreading but had larger global warming potentials, which could be particularly important with injection. Harrowing consequently appeared as the best compromise. Despite the large range of LCA results, robust conclusions could be drawn. To achieve a more refined comparison between the techniques, the use of process-based models in contrasted situations is suggested.

Brigitte Langevin; Claudine Basset-Mens; Laurent Lardon

2010-01-01T23:59:59.000Z

330

Coal slurry combustion optimization on single cylinder engine. Task 1.1.2.2.2, Combustion R&D  

SciTech Connect

Under the sponsorship of the US Department of Energy, Morgantown Energy Technology Center, GE Transportation System has been conducting a proof of concept program to use coal water slurry (CWS) fuel to power a diesel engine locomotive since 1988. As reported earlier [1], a high pressure electronically controlled accumulator injector using a diamond compact insert nozzle was developed for this project. The improved reliability and durability of this new FIE allowed for an improved and more thorough study of combustion of CWS fuel in a diesel engine. It was decided to include a diesel pilot fuel injector in the combustion system mainly due to engine start and low load operation needs. BKM, Inc. of San Diego, CA was contracted to develop the electronic diesel fuel pilot/starting FIE for the research engine. As a result, the experimental combustion study was very much facilitated due to the ability of changing pilot/CWS injection timings and quantities without having to stop the engine. Other parameters studied included combustion chamber configuration (by changing CWS fuel injector nozzle hole number/shape/angle), as well as injection pressure. The initial phase of this combustion study is now complete. The results have been adopted into the design of a 12 cylinder engine FIE, to be tested in 1992. This paper summarizes the main findings of this study.

Not Available

1992-09-01T23:59:59.000Z

331

Hypersonic Buckshot: Astrophysical Jets as Heterogeneous Collimated Plasmoids  

E-Print Network (OSTI)

Herbig-Haro (HH) jets are commonly thought of as homogeneous beams of plasma traveling at hypersonic velocities. Structure within jet beams is often attributed to periodic or ``pulsed'' variations of conditions at the jet source. Simulations based on this scenario result in knots extending across the jet diameter. Observations and recent high energy density laboratory experiments shed new light on structures below this scale and indicate they may be important for understanding the fundamentals of jet dynamics. In this paper we offer an alternative to ``pulsed'' models of protostellar jets. Using direct numerical simulations we explore the possibility that jets are chains of sub-radial clumps propagating through a moving inter-clump medium. Our models explore an idealization of this scenario by injecting small ($r\\rho_{jet}$) spheres embedded in an otherwise smooth inter-clump jet flow. The spheres are initialized with velocities differing from the jet velocity by $\\sim15$%. We find the consequences of shifting from homogeneous to heterogeneous flows are significant as clumps interact with each other and with the inter-clump medium in a variety of ways. Structures which mimic what is expected from pulsed-jet models can form, as can previously unseen ``sub-radial'' behaviors including backward facing bow shocks and off-axis working surfaces. While these small-scale structures have not been seen before in simulation studies, they are found in high resolution jet observations. We discuss implications of our simulations for the interpretation of protostellar jets with regard to characterization of knots by a ``lifetime'' or ``velocity history'' approach as well as linking observed structures with central engines which produce the jets.

Kristopher Yirak; Adam Frank; Andrew J. Cunningham; Sorin Mitran

2008-05-30T23:59:59.000Z

332

THE ACCELERATING JET OF 3C 279  

SciTech Connect

Analysis of the proper motions of the subparsec scale jet of the quasar 3C 279 at 15 GHz with the Very Long Baseline Array shows significant accelerations in four of nine superluminal features. Analysis of these motions is combined with the analysis of flux density light curves to constrain values of Lorentz factor and viewing angle (and their derivatives) for each component. The data for each of these components are consistent with significant changes to the Lorentz factor, viewing angle, and azimuthal angle, suggesting jet bending with changes in speed. We see that for these observed components Lorentz factors are in the range {Gamma} = 10-41, viewing angles are in the range thetav = 0. Degree-Sign 1-5. Degree-Sign 0, and intrinsic (source frame) flux density is in the range, F{sub {nu},int} 1.5 Multiplication-Sign 10{sup -9}-1.5 Multiplication-Sign 10{sup -5} Jy. Considering individual components, the Lorentz factors vary from {Gamma} = 11-16 for C1, {Gamma} = 31-41 for C5, {Gamma} = 29-41 for C6, and {Gamma} = 9-12 for C8, indicating that there is no single underlying flow speed to the jet and likely we are seeing pattern speeds from shocks in the jet. The viewing angles vary in time from 0. Degree-Sign 6 to 1. Degree-Sign 5 in the case of C1 (the least extreme example), from 0. Degree-Sign 5 to 5. Degree-Sign 0 in the case of C8, and from 0. Degree-Sign 1 to 0. Degree-Sign 9 for C5 (the last two being the most extreme examples). The intrinsic flux density varies by factors from 1.4 for C8 and 430 for C5. Theoretical analysis of the accelerations also indicates potential jet bending. In addition, for one component, C5, polarization measurements also set limits to the trajectory of the jet.

Bloom, S. D. [Department of Physics and Astronomy, Hampden-Sydney College, Box 821, Hampden-Sydney, VA 23943 (United States); Fromm, C. M.; Ros, E., E-mail: sbloom@hsc.edu [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany)

2013-01-01T23:59:59.000Z

333

Experimental study of elliptical jet from sub to supercritical conditions  

SciTech Connect

The jet mixing at supercritical conditions involves fluid dynamics as well as thermodynamic phenomena. All the jet mixing studies at critical conditions to the present date have focused only on axisymmetric jets. When the liquid jet is injected into supercritical environment, the thermodynamic transition could be well understood by considering one of the important fluid properties such as surface tension since it decides the existence of distinct boundary between the liquid and gaseous phase. It is well known that an elliptical liquid jet undergoes axis-switching phenomena under atmospheric conditions due to the presence of surface tension. The experimental investigations were carried out with low speed elliptical jet under supercritical condition. Investigation of the binary component system with fluoroketone jet and N{sub 2} gas as environment shows that the surface tension force dominates for a large downstream distance, indicating delayed thermodynamic transition. The increase in pressure to critical state at supercritical temperature is found to expedite the thermodynamic transition. The ligament like structures has been observed rather than droplets for supercritical pressures. However, for the single component system with fluoroketone jet and fluoroketone environment shows that the jet disintegrates into droplets as it is subjected to the chamber conditions even for the subcritical pressures and no axis switching phenomenon is observed. For a single component system, as the pressure is increased to critical state, the liquid jet exhibits gas-gas like mixing behavior and that too without exhibiting axis-switching behavior.

Muthukumaran, C. K.; Vaidyanathan, Aravind, E-mail: aravind7@iist.ac.in [Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Trivandrum, Kerala 695547 (India)] [Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Trivandrum, Kerala 695547 (India)

2014-04-15T23:59:59.000Z

334

Jet momentum balance independent of shear viscosity  

E-Print Network (OSTI)

Jet momentum balance measurements, such as those recently performed by the CMS collaboration, provide an opportunity to quantify the energy transferred from a parton shower to the underlying medium in heavy-ion collisions. Specifically, I argue that the Cooper-Frye freezeout distribution associated with the energy and momentum deposited by the parton shower is controlled to a significant extent by the distribution of the underlying bulk matter and independent of the details of how deposited energy is redistributed in the medium, which is largely determined by transport coefficients such as shear viscosity. Thus by matching the distribution of momentum associated with the secondary jet in such measurements to the thermal distribution of the underlying medium, one can obtain a model independent estimate on the amount of parton shower energy deposited.

R. B. Neufeld

2011-08-31T23:59:59.000Z

335

Cryogenic target formation using cold gas jets  

DOE Patents (OSTI)

A method and apparatus using cold gas jets for producing a substantially uniform layer of cryogenic materials on the inner surface of hollow spherical members having one or more layers, such as inertially imploded targets. By vaporizing and quickly refreezing cryogenic materials contained within a hollow spherical member, a uniform layer of the materials is formed on an inner surface of the spherical member. Basically the method involves directing cold gas jets onto a spherical member having one or more layers or shells and containing the cryogenic material, such as a deuterium-tritium (DT) mixture, to freeze the contained material, momentarily heating the spherical member so as to vaporize the contained material, and quickly refreezing the thus vaporized material forming a uniform layer of cryogenic material on an inner surface of the spherical member.

Hendricks, Charles D. (Livermore, CA)

1981-01-01T23:59:59.000Z

336

Phenomenology of Gamma-Ray Jets  

E-Print Network (OSTI)

We discuss some phenomenological aspects of $\\gamma$-ray emitting jets. In particular, we present calculations of the $\\gamma$-sphere and $\\pi$-sphere for various target photon fields, and employ them to demonstrate how $\\gamma$-ray observations at very high energies can be used to constraint the Doppler factor of the emitting plasma and the production of VHE neutrinos. We also consider the implications of the rapid TeV variability observed in M87 and the TeV blazars, and propose a model for the very rapid TeV flares observed with HESS and MAGIC in some blazars,that accommodates the relatively small Doppler factors inferred from radio observations. Finally, we briefly discuss the prospects for detecting VHE neutrinos from relativistic jets.

Amir Levinson

2007-09-10T23:59:59.000Z

337

Cross hedging jet-fuel price exposure  

Science Journals Connector (OSTI)

This paper investigates the cross hedging performance of several oil forwards contracts using WTI, Brent, gasoil and heating oil to manage jet-fuel spot price exposure. We apply three econometric techniques that have been widely tested and applied in the cross hedging literature on foreign exchange and stock index futures markets. Using quotes from the financial industry on forward contracts, we can show that the optimal cross hedging instrument depends on the maturity of the instrument's forwards contract. The results highlight that the standard approach in the literature to use crude oil as a cross hedge is not optimal for time horizons of three months or less. By contrast, for short hedging horizons our results indicate that gasoil forwards contracts represent the highest cross hedging efficiency for jet-fuel spot price exposure, while for maturities of more than three months, the predominance of gasoil diminishes in comparison to WTI and Brent.

Zeno Adams; Mathias Gerner

2012-01-01T23:59:59.000Z

338

Dense, vertical jet in stagnant homogeneous fluid  

E-Print Network (OSTI)

30. 4 53. 2 76. 0 21. 5 37. 6 53. 7 17. 5 30. 7 41. 6 3. 1 5. 4 7. 7 G. l 10. 0 15. 4 9. 2 16. 1 21. 9 0. 16 0. 28 0. 40 0. 65 1. 13 l. 62 1. 46 2. 55 3 45 H/D 50. 0 50. 0 50. 0 25. 0 25. 0 25. 0 16. 7 16, 7 16. 7...) m D 120 80 1 m D d Jet Height(from the nozzle) Abraham Jet or nozzle diameter (slope = 1. 94) Riser height H/d 0 5 r liater depth(Tank depth) (slope 1 89) L4 ft. (1. 22 m. )] s 0 pe' H/d = 0. 333 I +Turner (slope = 1. 82) ~~ ~ (slope...

Vergara, Ignacio

2012-06-07T23:59:59.000Z

339

Azimuthal Jet Tomography at RHIC and LHC  

E-Print Network (OSTI)

A generic jet-energy loss model that is coupled to state-of-the-art hydrodynamic fields and interpolates between a wide class of running coupling pQCD-based and AdS/CFT-inspired models is compared to recent data on the azimuthal and transverse momentum dependence of high-pT pion nuclear modification factors and high-pT elliptic flow measured at RHIC and LHC. We find that RHIC data are surprisingly consistent with various scenarios considered. However, extrapolations to LHC energies favor running coupling pQCD-based models of jet-energy loss. While conformal holographic models are shown to be inconsistent with data, recent non-conformal generalizations of AdS holography may provide an alternative description.

Barbara Betz; Miklos Gyulassy

2014-02-14T23:59:59.000Z

340

Cryogenic target formation using cold gas jets  

DOE Patents (OSTI)

A method and apparatus using cold gas jets for producing a substantially uniform layer of cryogenic materials on the inner surface of hollow spherical members having one or more layers, such as inertially imploded targets are disclosed. By vaporizing and quickly refreezing cryogenic materials contained within a hollow spherical member, a uniform layer of the materials is formed on an inner surface of the spherical member. Basically the method involves directing cold gas jets onto a spherical member having one or more layers or shells and containing the cryogenic material, such as a deuterium-tritium (DT) mixture, to freeze the contained material, momentarily heating the spherical member so as to vaporize the contained material, and quickly refreezing the thus vaporized material forming a uniform layer of cryogenic material on an inner surface of the spherical member. 4 figs.

Hendricks, C.D.

1980-02-26T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Cryogenic target formation using cold gas jets  

DOE Patents (OSTI)

A method and apparatus using cold gas jets for producing a substantially uniform layer of cryogenic materials on the inner surface of hollow spherical members having one or more layers, such as inertially imploded targets. By vaporizing and quickly refreezing cryogenic materials contained within a hollow spherical member, a uniform layer of the materials is formed on an inner surface of the spherical member. Basically the method involves directing cold gas jets onto a spherical member having one or more layers or shells and containing the cryogenic material, such as a deuterium-tritium (DT) mixture, to freeze the contained material, momentarily heating the spherical member so as to vaporize the contained material, and quickly refreezing the thus vaporized material forming a uniform layer of cryogenic material on an inner surface of the spherical member.

Hendricks, Charles D. [Livermore, CA

1980-02-26T23:59:59.000Z

342

Thomson scattering measurements in atmospheric plasma jets  

Science Journals Connector (OSTI)

Electron temperature and electron density in a dc plasma jet at atmospheric pressure have been obtained using Thomson laser scattering. Measurements performed at various scattering angles have revealed effects that are not accounted for by the standard scattering theory. Differences between the predicted and experimental results suggest that higher order corrections to the theory may be required, and that corrections to the form of the spectral density function may play an important role.

G. Gregori; J. Schein; P. Schwendinger; U. Kortshagen; J. Heberlein; E. Pfender

1999-02-01T23:59:59.000Z

343

NLO QCD Predictions for W+3 jets  

SciTech Connect

In this contribution we present results from the NLO computation of the production of a W boson in association with three jets in hadronic collisions. The results are obtained by combining two programs: BlackHat for the virtual one-loop matrix elements and Sherpa for the real-emission contributions. We present results for the Tevatron and the LHC, and address the issue of the choice of a common factorization and renormalization scale for this process.

Maitre, Daniel; /Durham U.; Berger, Carola F.; /MIT; Bern, Zvi; Febres Cordero, Fernando; Ita, Harald; Dixon, Lance J.; Forde, Darren; Gleisberg, Tanju; /UCLA /SLAC; Kosower, David; /Saclay, SPhT

2009-12-09T23:59:59.000Z

344

ON THE ORIGIN OF INTERGRANULAR JETS  

SciTech Connect

We observe that intergranular jets, originating in the intergranular space surrounding individual granules, tend to be associated with granular fragmentation, in particular, with the formation and evolution of a bright granular lane (BGL) within individual granules. The BGLs have recently been identified as vortex tubes by Steiner et al. We further discover the development of a well-defined bright grain located between the BGL and the dark intergranular lane to which it is connected. Signatures of a BGL may reach the lower chromosphere and can be detected in off-band H{alpha} images. Simulations also indicate that vortex tubes are frequently associated with small-scale magnetic fields. We speculate that the intergranular jets detected in the New Solar Telescope (NST) data may result from the interaction between the turbulent small-scale fields associated with the vortex tube and the larger-scale fields existing in the intergranular lanes. The intergranular jets are much smaller and weaker than all previously known jet-like events. At the same time, they appear much more numerous than the larger events, leading us to the speculation that the total energy release and mass transport by these tiny events may not be negligible in the energy and mass-flux balance near the temperature minimum atop the photosphere. The study is based on the photospheric TiO broadband (1.0 nm) filter data acquired with the 1.6 m NST operating at the Big Bear Solar Observatory. The data set also includes NST off-band H{alpha} images collected through a Zeiss Lyot filter with a passband of 0.025 nm.

Yurchyshyn, V. B.; Goode, P. R.; Abramenko, V. I. [Big Bear Solar Observatory, New Jersey Institute of Technology, Big Bear City, CA 92314 (United States); Steiner, O. [Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstrasse 6, D-79104 Freiburg (Germany)

2011-08-01T23:59:59.000Z

345

Sting jets in intense winter North-Atlantic windstorms  

Science Journals Connector (OSTI)

Extratropical cyclones dominate autumn and winter weather over western Europe. The strongest cyclones, often termed windstorms, have a large socio-economic impact due to the strong surface winds and associated storm surges in coastal areas. Here we show that sting jets are a common feature of windstorms; up to a third of the 100 most intense North-Atlantic winter windstorms over the last two decades satisfy conditions for sting jets. The sting jet is a mesoscale descending airstream that can cause strong near-surface winds in the dry slot of the cyclone, a region not usually associated with strong winds. Despite their localized transient nature, these sting jets can cause significant damage, a prominent example being the storm that devastated southeast England on 16 October 1987. We present the first regional climatology of windstorms with sting jets. Previously analysed sting-jet cases appear to have been exceptional in their track over northwest Europe rather than in their strength.

Oscar Martínez-Alvarado; Suzanne L Gray; Jennifer L Catto; Peter A Clark

2012-01-01T23:59:59.000Z

346

Polarization and energy content of parsec scale AGN jets  

E-Print Network (OSTI)

Most of energy carried by relativistic AGN jets remains undetected until hundreds of kiloparsecs where interaction with intergalactic medium produces hot spots. The jet's hidden energy is only partially dissipated at smaller scales, from parsecs to kiloparsecs. Several media may play the role of the ``prime mover'': ions, pairs or large scale magnetic fields. Analyzing VLBI polarization structures of relativistic parsec scale jets we conclude that large-scale magnetic fields can explain the salient polarization properties of parsec-scale AGN jets. This implies that large-scale magnetic fields carry a non-negligible fraction of jet luminosity. We also discuss the possibility that relativistic AGN jets may be electromagnetically (Poynting flux) dominated. In this case, dissipation of the toroidal magnetic field (and not fluid shocks) may be responsible for particle acceleration.

Maxim Lyutikov; Vladimir I. Pariev; Denise C. Gabuzda

2004-11-15T23:59:59.000Z

347

Jet conversions in a quark-gluon plasma  

Science Journals Connector (OSTI)

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic q(q¯)g?gq(q¯) and the inelastic qq¯?gg scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net of quark jets to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the p/?+ and p¯/?- ratios at high transverse momentum. However, a much larger net quark-to-gluon jet conversion rate than the one given by the lowest order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at the same energy. Implications of our results are discussed.

W. Liu; C. M. Ko; B. W. Zhang

2007-05-04T23:59:59.000Z

348

Studies of Relativistic Jets in Active Galactic Nuclei with SKA  

E-Print Network (OSTI)

Relativistic jets in active galactic nuclei (AGN) are among the most powerful astrophysical objects discovered to date. Indeed, jetted AGN studies have been considered a prominent science case for SKA, and were included in several different chapters of the previous SKA Science Book (Carilli & Rawlings 2004). Most of the fundamental questions about the physics of relativistic jets still remain unanswered, and await high-sensitivity radio instruments such as SKA to solve them. These questions will be addressed specially through analysis of the massive data sets arising from the deep, all-sky surveys (both total and polarimetric flux) from SKA1. Wide-field very-long-baseline-interferometric survey observations involving SKA1 will serve as a unique tool for distinguishing between extragalactic relativistic jets and star forming galaxies via brightness temperature measurements. Subsequent SKA1 studies of relativistic jets at different resolutions will allow for unprecedented cosmological studies of AGN jets up...

Agudo, Ivan; Falcke, Heino; Georganopoulos, Markos; Ghisellini, Gabriele; Giovannini, Gabriele; Giroletti, Marcello; Gomez, Jose L; Gurvits, Leonid; Laing, Robert; Lister, Matthew; Marti, Jose-Maria; Meyer, Eileen T; Mizuno, Yosuke; O'Sullivan, Shane; Padovani, Paolo; Paragi, Zsolt; Perucho, Manel; Schleicher, Dominik; Stawarz, Lukasz; Vlahakis, Nektarios; Wardle, John

2015-01-01T23:59:59.000Z

349

MEASURING THE JET POWER OF FLAT-SPECTRUM RADIO QUASARS  

SciTech Connect

We use frequency-dependent position shifts of flat-spectrum radio cores to estimate the kinetic power of active galactic nucleus (AGN) jets. We find a correlation between the derived jet powers and AGN narrow-line luminosity, consistent with the well-known relation for radio galaxies and steep spectrum quasars. This technique can be applied to intrinsically weak jets even at high redshift.

Shabala, S. S.; Santoso, J. S. [School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001 (Australia); Godfrey, L. E. H. [International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia)

2012-09-10T23:59:59.000Z

350

A PRECESSING JET IN THE CH Cyg SYMBIOTIC SYSTEM  

SciTech Connect

Jets have been detected in only a few symbiotic binaries to date, and CH Cyg is one of them. In 2001, a non-relativistic jet was detected in CH Cyg for the first time in X-rays. We carried out coordinated Chandra, Hubble Space Telescope (HST), and VLA observations in 2008 to study the propagation of this jet and its interaction with the circumbinary medium. We detected the jet with Chandra and HST and determined that the apex has expanded to the south from {approx}300 AU to {approx}1400 AU, with the shock front propagating with velocity <100 km s{sup -1}. The shock front has significantly slowed down since 2001. Unexpectedly, we also discovered a powerful jet in the NE-SW direction, in the X-ray, optical and radio. This jet has a multi-component structure, including an inner jet and a counterjet at {approx}170 AU, and a SW component ending in several clumps extending out to {approx}750 AU. The structure of the jet and the curvature of the outer portion of the SW jet suggest an episodically powered precessing jet or a continuous precessing jet with occasional mass ejections or pulses. We carried out detailed spatial mapping of the X-ray emission and correlation with the optical and radio emission. X-ray spectra were extracted from the central source, inner NE counterjet, and the brightest clump at a distance of {approx}500 AU from the central source. We discuss the initial results of our analyses, including the multi-component spectral fitting of the jet components and of the central source.

Karovska, Margarita; Gaetz, Terrance J.; Raymond, John C.; Lee, Nicholas P. [Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138 (United States); Carilli, Christopher L. [National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801 (United States); Hack, Warren [Space Telescope Science Institute, Baltimore, MD 21218-2463 (United States)], E-mail: mkarovska@cfa.harvard.edu

2010-02-20T23:59:59.000Z

351

Ultra-precision figuring using submerged jet polishing  

Science Journals Connector (OSTI)

A new removal optimization method called submerged jet polishing (SJP) is reported. Experiments are conducted to obtain the removal shape. Results of SJP ...

Shi, Chunyan; Yuan, Jiahu; Wu, Fan; Wan, Yongjian

2011-01-01T23:59:59.000Z

352

Environmental and economic assessment of microalgae-derived jet fuel  

E-Print Network (OSTI)

Significant efforts must be undertaken to quantitatively assess various alternative jet fuel pathways when working towards achieving environmental and economic United States commercial and military alternative aviation ...

Carter, Nicholas Aaron

2012-01-01T23:59:59.000Z

353

COLLIMATION AND CONFINEMENT OF MAGNETIC JETS BY EXTERNAL MEDIA  

SciTech Connect

We study the collimation of a highly magnetized jet by a surrounding cocoon that forms as a result of the interaction of the jet with the external medium. We show that in regions where the jet is well confined by the cocoon, current-driven instabilities should develop over timescales shorter than the expansion time of the jet's head. We speculate that these instabilities would give rise to complete magnetic field destruction, whereby the jet undergoes a transition from high to low sigma above the collimation zone. Using this assumption, we construct a self-consistent model for the evolution of the jet-cocoon system in an ambient medium of arbitrary density profile. We apply the model to jet breakout in long gamma-ray bursts (GRBs) and show that the jet is highly collimated inside the envelope of the progenitor star and is likely to remain confined well after breakout. We speculate that this strong confinement may provide a channel for magnetic field conversion in GRB outflows, whereby the hot, low-sigma jet section thereby produced is the source of the photospheric emission observed in many bursts.

Levinson, Amir [School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978 (Israel)] [School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978 (Israel); Begelman, Mitchell C., E-mail: Levinson@wise.tau.ac.il, E-mail: mitch@jila.colorado.edu [JILA, University of Colorado and National Institute of Standards and Technology, 440 UCB, Boulder, CO 80309-0440 (United States)

2013-02-20T23:59:59.000Z

354

Intense and Highly Energetic Atmospheric Pressure Plasma Jet Arrays.  

E-Print Network (OSTI)

??This thesis documents the efforts taken to produce highly ionized and concentrated atmospheric pressure plasma using an arrayed atmospheric pressure plasma jet (APPJ) system. The… (more)

Furmanski, John

2012-01-01T23:59:59.000Z

355

An experimental study of jet impingement on a circular cylinder  

E-Print Network (OSTI)

diameter of 6 5/8 inches. The jet was impinged upon the cylinder at nozzle distances of 7, 15, and 30 nozzle diameters, and at velocities of' 400 and 500 ft/s. The free jet was studied and found to be "typical" by comparing it to earlier studies done... Instrumentation schematic 17 5 Cylindrical suriace coordinate system 22 6 Photograph of the cylinder with "grid" 23 7 Photograph of the wall jet traversing apparatus 24 8 Orientation of the hot film sensor 25 9 Free jet geometry and parameters 30 10 Velocity...

Potts, Dennis Wayne

2012-06-07T23:59:59.000Z

356

Inclusive-jet photoproduction at HERA and determination of alphas  

E-Print Network (OSTI)

Inclusive-jet cross sections have been measured in the reaction ep->e+jet+X for photon virtuality Q2 energies in the region 142 energy, ETjet, and pseudorapidity, etajet, for jets with ETjet > 17 GeV and -1 energy-scale dependence of the coupling was determined. The value of alphas(Mz) extracted from the measurements based on the kT jet algorithm is alphas(Mz) = 0.1206 +0.0023 -0.0022 (exp.) +0.0042 -0.0035 (th.); the results from the anti-kT and SIScone algorithms are compatible with this value and have a similar precision.

ZEUS Collaboration; H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; P. Antonioli; A. Antonov; M. Arneodo; V. Aushev; Y. Aushev; O. Bachynska; A. Bamberger; A. N. Barakbaev; G. Barbagli; G. Bari; F. Barreiro; N. Bartosik; D. Bartsch; M. Basile; O. Behnke; J. Behr; U. Behrens; L. Bellagamba; A. Bertolin; S. Bhadra; M. Bindi; C. Blohm; V. Bokhonov; T. Bold; K. Bondarenko; E. G. Boos; K. Borras; D. Boscherini; D. Bot; I. Brock; E. Brownson; R. Brugnera; N. Brummer; A. Bruni; G. Bruni; B. Brzozowska; P. J. Bussey; B. Bylsma; A. Caldwell; M. Capua; R. Carlin; C. D. Catterall; S. Chekanov; J. Chwastowski; J. Ciborowski; R. Ciesielski; L. Cifarelli; F. Cindolo; A. Contin; A. M. Cooper-Sarkar; N. Coppola; M. Corradi; F. Corriveau; M. Costa; G. D'Agostini; F. Dal Corso; J. del Peso; R. K. Dementiev; S. De Pasquale; M. Derrick; R. C. E. Devenish; D. Dobur; B. A. Dolgoshein; G. Dolinska; A. T. Doyle; V. Drugakov; L. S. Durkin; S. Dusini; Y. Eisenberg; P. F. Ermolov; A. Eskreys; S. Fang; S. Fazio; J. Ferrando; M. I. Ferrero; J. Figiel; M. Forrest; B. Foster; G. Gach; A. Galas; E. Gallo; A. Garfagnini; A. Geiser; I. Gialas; A. Gizhko; L. K. Gladilin; D. Gladkov; C. Glasman; O. Gogota; Yu. A. Golubkov; P. Gottlicher; I. Grabowska-Bold; J. Grebenyuk; I. Gregor; G. Grigorescu; G. Grzelak; O. Gueta; M. Guzik; C. Gwenlan; T. Haas; W. Hain; R. Hamatsu; J. C. Hart; H. Hartmann; G. Hartner; E. Hilger; D. Hochman; R. Hori; K. Horton; A. Huttmann; Z. A. Ibrahim; Y. Iga; R. Ingbir; M. Ishitsuka; H. -P. Jakob; F. Januschek; T. W. Jones; M. Jungst; I. Kadenko; B. Kahle; S. Kananov; T. Kanno; U. Karshon; F. Karstens; I. I. Katkov; M. Kaur; P. Kaur; A. Keramidas; L. A. Khein; J. Y. Kim; D. Kisielewska; S. Kitamura; R. Klanner; U. Klein; E. Koffeman; N. Kondrashova; O. Kononeko; P. Kooijman; Ie. Korol; I. A. Korzhavina; A. Kotanski; U. Kotz; H. Kowalski; O. Kuprash; M. Kuze; A. Lee; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; T. Y. Ling; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Lohr; E. Lohrmann; K. R. Long; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; J. Maeda; S. Magill; I. Makarenko; J. Malka; R. Mankel; A. Margotti; G. Marini; J. F. Martin; A. Mastroberardino; M. C. K. Mattingly; I. -A. Melzer-Pellmann; S. Mergelmeyer; S. Miglioranzi; F. Mohamad Idris; V. Monaco; A. Montanari; J. D. Morris; K. Mujkic; B. Musgrave; K. Nagano; T. Namsoo; R. Nania; A. Nigro; Y. Ning; T. Nobe; U. Noor; D. Notz; R. J. Nowak; A. E. Nuncio-Quiroz; B. Y. Oh; N. Okazaki; K. Oliver; K. Olkiewicz; Yu. Onishchuk; K. Papageorgiu; A. Parenti; E. Paul; J. M. Pawlak; B. Pawlik; P. G. Pelfer; A. Pellegrino; W. Perlanski; H. Perrey; K. Piotrzkowski; P. Plucinski; N. S. Pokrovskiy; A. Polini; A. S. Proskuryakov; M. Przybycien; A. Raval; D. D. Reeder; B. Reisert; Z. Ren; J. Repond; Y. D. Ri; A. Robertson; P. Roloff; I. Rubinsky; M. Ruspa; R. Sacchi; U. Samson; G. Sartorelli; A. A. Savin; D. H. Saxon; M. Schioppa; S. Schlenstedt; P. Schleper; W. B. Schmidke; U. Schneekloth; V. Schonberg; T. Schorner-Sadenius; J. Schwartz; F. Sciulli; L. M. Shcheglova; R. Shehzadi; S. Shimizu; I. Singh; I. O. Skillicorn; W. Slominski; W. H. Smith; V. Sola; A. Solano; D. Son; V. Sosnovtsev; A. Spiridonov; H. Stadie; L. Stanco; N. Stefaniuk; A. Stern; T. P. Stewart; A. Stifutkin; P. Stopa; S. Suchkov; G. Susinno; L. Suszycki; J. Sztuk-Dambietz; D. Szuba; J. Szuba; A. D. Tapper; E. Tassi; J. Terron; T. Theedt; H. Tiecke; K. Tokushuku; J. Tomaszewska; V. Trusov; T. Tsurugai; M. Turcato; O. Turkot; T. Tymieniecka; M. Vazquez; A. Verbytskyi; O. Viazlo; N. N. Vlasov; R. Walczak; W. A. T. Wan Abdullah; J. J. Whitmore; L. Wiggers; M. Wing; M. Wlasenko; G. Wolf; H. Wolfe; K. Wrona; A. G. Yagues-Molina; S. Yamada; Y. Yamazaki; R. Yoshida; C. Youngman; O. Zabiegalov; A. F. Zarnecki; L. Zawiejski; O. Zenaiev; W. Zeuner; B. O. Zhautykov; N. Zhmak; C. Zhou; A. Zichichi; Z. Zolkapli; D. S. Zotkin

2012-05-28T23:59:59.000Z

357

On the interaction of microquasar jets with stellar winds  

E-Print Network (OSTI)

Strong interactions between jets and stellar winds at binary system spatial scales could occur in high-mass microquasars. We study here, mainly from a dynamical but also a radiative point of view, the collision between a dense stellar wind and a mildly relativistic hydrodynamical jet of supersonic nature.}{We have performed numerical 2-dimensional simulations of jets, with cylindrical and planar (slab) symmetry, crossing the stellar wind material. From the results of the simulations, we derive estimates of the particle acceleration efficiency, using first order Fermi acceleration theory, and give some insight on the possible radiative outcomes. We find that, during jet launching, the jet head generates a strong shock in the wind. During and after this process, strong recollimation shocks can occur due to the initial overpressure of the jet with its environment. The conditions in all these shocks are convenient to accelerate particles up to $\\sim$ TeV energies, which can lead to leptonic (synchrotron and inverse Compton) and hadronic (proton-proton) radiation. In principle, the cylindrical jet simulations show that the jet is stable, and can escape from the system even for relatively low power. However, when accounting for the wind ram pressure, the jet can be bent and disrupted for power $\\la 10^{36}$ erg s$^{-1}$.

M. Perucho; V. Bosch-Ramon

2008-02-08T23:59:59.000Z

358

An alternative model of jet suppression at RHIC energies  

E-Print Network (OSTI)

We propose a simple Glauber-type mechanism for suppression of jet production up to transverse momenta of about 10 GeV/c at RHIC. For processes in this kinematic region, the formation time is smaller than the interval between two successive hard partonic collisions and the subsequent collision influences the jet production. Number of jets then roughly scales with the number of participants. Proportionality to the number of binary collisions is recovered for very high transverse momenta. The model predicts suppression of jet production in d+Au collisions at RHIC.

Roman Lietava; Jan Pisut; Neva Pisutova; Boris Tomasik

2003-02-10T23:59:59.000Z

359

Geographic Area Month Aviation Gasoline Kerosene-Type Jet Fuel  

Gasoline and Diesel Fuel Update (EIA)

State (Cents per Gallon Excluding Taxes) - Continued Geographic Area Month Aviation Gasoline Kerosene-Type Jet Fuel Kerosene Sales to End Users Sales for Resale Sales to End...

360

ANALYSES OF HTF-48-12-20/24 (FEBRUARY, 2012) AND ARCHIVED HTF-E-05-021 TANK 48H SLURRY SAMPLES  

SciTech Connect

Personnel characterized a Savannah River National Laboratory (SRNL) archived sample of Tank 48H slurry (HTF-E-05-021) in addition to the composite of samples HTF-48-12-20 and HTF-48-12-24, which were both retrieved in February 2012. The combined February 2012 sample is referred to as HTF-48-12-20/24 in this report. The results from these analyses are compared with Tank 48H samples analyzed in 2003, 2004, and 2005. This work supports the effort to demonstrate copper-catalyzed peroxide oxidation (CCPO) of organic content in this material. The principal findings with respect to the chemical and physical characteristics of the most recent sample are: (1) The measured potassium tetraphenylborate (KTPB) solid concentration is 1.76 wt %; (2) Titanium was in line with 2004 and 2005 slurry measurements at 897 mg/L, it represents 0.1535 {+-} 0.0012 wt % monosodium titanate (MST); (3) The measured insoluble solids content was 1.467 wt %; (4) The free hydroxide concentration in the Tank 48H filtrate sample (1.02 {+-} 0.02 M) is close to the Tank 48H limit (1.0 M); (5) Carbonate reported by total inorganic carbon (TIC, 1.39 {+-} 0.03 M) is more than double the concentrations measured in past (2003-2005) samples; (6) The soluble potassium content (measured at 286 {+-} 23 mg/L) in the filtrate is in line with all past measurements; and (7) The measured {sup 137}Cs concentration is 7.81E + 08 {+-} 3.9E + 07 dpm/mL of slurry (1.33 {+-} 5% Ci/gallon or 3.18E + 05 {+-} 5% curies of {sup 137}Cs in the tank) in the slurry which is in agreement with the 2005 report of 3.14E + 05 {+-} 1.5% curies of {sup 137}Cs in the tank. The filtrate {sup 137}Cs concentration is 2.57E + 07 {+-} 2.6E + 05 dpm/mL. This result is consistent with previous results. Significant analytical data are summarized in Table 1.

Nash, C.; Peters, T.

2012-08-02T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Generation and Propagation of Inertia Gravity Waves from Vortex Dipoles and Jets Shuguang Wang  

E-Print Network (OSTI)

Generation and Propagation of Inertia Gravity Waves from Vortex Dipoles and Jets Shuguang Wang generation and propagation from jets within idealized vortex dipoles using a nonhydrostatic mesoscale model, moist convection, fronts, upper level jets, geostrophic adjustment and spontaneous generation (Fritts

362

The Anomalous Merging of the African and North Atlantic Jet Streams during the Northern Hemisphere Winter of 2010  

Science Journals Connector (OSTI)

The North Atlantic jet stream during winter 2010 was unusually zonal, so the typically separated Atlantic and African jets were merged into one zonal jet. Moreover, the latitude–height structure and temporal variability of the North Atlantic jet ...

N. Harnik; E. Galanti; O. Martius; O. Adam

2014-10-01T23:59:59.000Z

363

E-Print Network 3.0 - atmospheric plasma jet Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

University Collection: Engineering 2 Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for Summary: Atmospheric Pressure Plasma Jet Treatment of Polyethylene...

364

Enabling High Efficiency Low Temperature Combustion by Adaptive In-Situ Jet Cooling  

Energy.gov (U.S. Department of Energy (DOE))

A new approach, called Adaptive-Jet-Cooling, leverages two distinct spray patters of hollow conical sprays and conventional multiple jets, eliminating key sources of NOx and PM.

365

Radiant Energy Power Source for Jet Aircraft  

SciTech Connect

This report beings with a historical overview on the origin and early beginnings of Radiant Energy Power Source for Jet Aircraft. The report reviews the work done in Phase I (Grant DE-FG01-82CE-15144) and then gives a discussion of Phase II (Grant DE-FG01-86CE-15301). Included is a reasonably detailed discussion of photovoltaic cells and the research and development needed in this area. The report closes with a historical perspective and summary related to situations historically encountered on projects of this nature. 15 refs.

Doellner, O.L.

1992-02-01T23:59:59.000Z

366

Memory effects in radiative jet energy loss  

E-Print Network (OSTI)

In heavy-ion collisions the created quark-gluon plasma forms a quickly evolving background, leading to a time dependent radiative behavior of high momentum partons traversing the medium. We use the Schwinger Keldysh formalism to describe the jet evolution as a non-equilibrium process including the Landau-Pomeranschuk-Migdal effect. Concentrating on photon emission, a comparison of our results to a quasistatic calculation shows good agreement, leading to the conclusion that the radiative behavior follows the changes in the medium almost instantaneously.

Frank Michler; Björn Schenke; Carsten Greiner

2009-05-18T23:59:59.000Z

367

SIMULATION AND MOCKUP OF SNS JET-FLOW TARGET WITH WALL JET FOR CAVITATION DAMAGE MITIGATION  

SciTech Connect

Pressure waves created in liquid mercury pulsed spallation targets at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory induce cavitation damage on the stainless steel target container. The cavitation damage is thought to limit the lifetime of the target for power levels at and above 1 MW. Severe through-wall cavitation damage on an internal wall near the beam entrance window has been observed in spent-targets. Surprisingly though, there is very little damage on the walls that bound an annular mercury channel that wraps around the front and outside of the target. The mercury flow through this channel is characterized by smooth, attached streamlines. One theory to explain this lack of damage is that the uni-directional flow biases the direction of the collapsing cavitation bubble, reducing the impact pressure and subsequent damage. The theory has been reinforced by in-beam separate effects data. For this reason, a second-generation SNS mercury target has been designed with an internal wall jet configuration intended to protect the concave wall where damage has been observed. The wall jet mimics the annular flow channel streamlines, but since the jet is bounded on only one side, the momentum is gradually diffused by the bulk flow interactions as it progresses around the cicular path of the target nose. Numerical simulations of the flow through this jet-flow target have been completed, and a water loop has been assembled with a transparent test target in order to visualize and measure the flow field. This paper presents the wall jet simulation results, as well as early experimental data from the test loop.

Wendel, Mark W [ORNL; Geoghegan, Patrick J [ORNL; Felde, David K [ORNL

2014-01-01T23:59:59.000Z

368

DEUTERONBEAMINTERACTIONWITH Li JET FOR A NEUTRONSOURCE TEST FACILITY*  

E-Print Network (OSTI)

DEUTERONBEAMINTERACTIONWITH Li JET FOR A NEUTRONSOURCE TEST FACILITY* A. Hassanein Argonne National Laboratory 9700 South Cass Avenue Argonne, Illinois 60439 USA The submitted manurript has teen authored Interaction with Li Jet for a NeutronSource Test Facility* A. Hassanein Argonne National Laboratory, Argonne

Harilal, S. S.

369

Acid Placement in Acid Jetting Treatments in Long Horizontal Wells  

E-Print Network (OSTI)

In the Middle East, extended reach horizontal wells (on the order of 25,000 feet of horizontal displacement) are commonly acid stimulated by jetting acid out of drill pipe. The acid is jetted onto the face of the openhole wellbore as the drill pipe...

Sasongko, Hari

2012-07-16T23:59:59.000Z

370

Acid placement and coverage in the acid jetting process  

E-Print Network (OSTI)

Many open-hole acid treatments are being conducted by pumping acid through jetting ports placed at the end of coiled tubing or drill pipe. The filter-cake on the bore-hole is broken by the jet; the acid-soluble material is dissolved, creating...

Mikhailov, Miroslav I.

2009-05-15T23:59:59.000Z

371

Behavior of shale oil jet fuels at variable severities  

SciTech Connect

Catalytic hydroprocessed shale oil jet fuels in the USA were characterized and compared with petroleum jet fuel to demonstrate their possibility as a conventional jet fuel substitute. The shale oils (Geokinetics, Occidental, Paraho and Tosco II) were hydrotreated in a 0.058m ID by 1.52m long reactor containing Ni/MO/Al/sub 2/O/sub 3/ catalyst. The fractionated hydrogenated shale oils at jet fuel ranges (120-300/sup 0/C) were analyzed for composition and physical properties. The increasing hydroprocessing severity proportionally decreased nitrogen, sulfur, olefins, and aromatics, and increased hydrogen content. The nitrogen content even at high severity conditions was considerably higher than that of conventional jet fuel. Sulfur and olefin contents were lower at all severities. The heat of combustion and the physical properties, except the freezing point, were comparable to petroleum jet fuels. The yields of jet fuels increased proportionally to increased severity. The study showed that high severity hydroprocessing gave better performance in processing shale oils to jet fuels.

Mukherjee, N.L.

1988-01-01T23:59:59.000Z

372

Effects of Chronic Jet Lag on Tumor Progression in Mice  

Science Journals Connector (OSTI)

...statistical significance as a function of lighting schedule, with poorest survival in jet-lagged...Research Training Fellowship from the Medical Research Council (to V. King). The...chronic jet lag Variable/experiment no. Lighting schedule Dominant period (h) Corresponding...

Elisabeth Filipski; Franck Delaunay; Verdun M. King; Ming-Wei Wu; Bruno Claustrat; Aline Gréchez-Cassiau; Catherine Guettier; Michael H. Hastings; and Lévi Francis

2004-11-01T23:59:59.000Z

373

Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for  

E-Print Network (OSTI)

Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for Adhesion Improvement Uwe studied the activation mechanism of polyethylene (PE) for a pretreatment with a commercial APPJ system jet system from Plasmatreat GmbH (Steinhagen, Germany) was used for the Full Paper Polyethylene (PE

Greifswald, Ernst-Moritz-Arndt-Universität

374

CONTROL OF COHERENT STRUCTURE IN COAXIAL SWIRLING TURBULENT JETS  

E-Print Network (OSTI)

stronger effect than the pilot jet itself, leading to an almost entire removal of coherent structures. 2.2. Flow Instability Swirl is naturally presented in the exhaust from a turbine or an axial flow pump, and may be deliberately generated... ............................................................................................. 1 2. REVIEW OF LITERATURE............................................................................. 6 2.1. Turbulent Jets with Swirl................................................................................ 7 2.2. Flow Instability...

Lee, Wonjoong

2008-01-01T23:59:59.000Z

375

Nonequilibrium Alfvénic Plasma Jets Associated with Spheromak Formation  

Science Journals Connector (OSTI)

Nonequilibrium Alfvénic flows have been observed in plasma jets during the helicity injection stage of the Caltech spheromak experiment. Density and time of flight measurements of these jets show that the flows convect dense plasma (??1) because of the axial gradient in the current channel profile. A simplified MHD theory is derived to model the flow.

Deepak Kumar and Paul M. Bellan

2009-09-04T23:59:59.000Z

376

Visualization of Jet Mixing in a Fluidic Oscillator  

Science Journals Connector (OSTI)

The fluidic oscillator is a device that generates an oscillating jet when supplied with fluid at pressure. The oscillator has no moving parts - the creation of the unsteady jet is based solely on fluid-dynamic interactions. Fluidic oscillators can operate ... Keywords: Flow control, Fluid mixing, Fluidic oscillator, Pressure-sensitive paint

J. W. Gregory; J. P. Sullivan; S. Raghu

2005-04-01T23:59:59.000Z

377

Search for New Physics in the Jets + Missing ET topology  

SciTech Connect

Although the standard model of particle physics agrees perfectly with experimental data, it is unlikely the final theory describing particles and their interactions. New phenomena has been searched in the jets and missing transverse energy topology. Such phenomena may be due to the pair production of leptoquarks decaying into a quark and a neutrino or the pair production of stops decaying into a charm and a neutralino which is assumed to be the lightest supersymmetric particle. These searches have been performed with the D0 detector at hadronic collider TeVatron with a center of mass energy of 1.96 TeV. This kind of search needs a good understanding of the jet energy calibration. The determination of the relative jet energy scale has allowed them to reduce the systematic uncertainties on the jet energy measurement when comparing the data and the simulation. Moreover a new method has been developed in order to correct simulated jets for the differences observed in the jet energy scale, the jet energy resolution and the jet reconstruction efficiency between the data and the simulation. The data analysis, performed with an integrated luminosity of 310 pb{sup -1}, has not observed any excess. This result is interpreted in terms of limit on the mass of the particles: leptoquarks with a mass smaller than 136 GeV and stops with a mass smaller than 131 GeV, for a neutralino mass equal to 46 GeV, are excluded with 95% confidence level.

Makovec, Nikola Michel; /Orsay

2006-05-01T23:59:59.000Z

378

Measurements of Vector Bosons Produced in Association with Jets  

E-Print Network (OSTI)

The latest D0 and CDF measurements of the important $W+{\\rm jets}$ and $Z/\\gamma^{*}+{\\rm jets}$ processes are described, along with a discussion of the comparisons that have been made to LO and NLO perturbative QCD predictions.

Cooper, Ben

2008-01-01T23:59:59.000Z

379

Modified Black Hole with Polar Jet and Vortex  

E-Print Network (OSTI)

There are many models relating an accretion disk of Black Hole to jet outflow. The herein heuristic model describes the continuation of an external accretion disk to an internal accretion disk for less than Black Hole horizon, and subsequent polar jet outflow along polar axis out of polar vortex wherein the event horizon is no longer descriptive.

T. Tmmalm

2001-12-06T23:59:59.000Z

380

Substructure of High-pT Jets at the LHC  

E-Print Network (OSTI)

of high-pT Jets at the LHC Leandro G. Almeida, Seung J. Lee,of high-p T Jets at the LHC Leandro G. Almeida a , Seung J.the Large Hadron Collider (LHC), events with highly-boosted

Almeida, L.G.

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Determination of extractable arsenic in soils using slurry sampling-on-line microwave extraction-hydride generation-atomic absorption spectrometry  

Science Journals Connector (OSTI)

A flow injection procedure has been developed for the determination of acid-extractable arsenic in soils by hydride generation atomic absorption spectrometry. Several parameters, including acid and borohydride concentrations, exposure time to microwave energy, and the microwave power applied, were optimized. The on-line microwave extraction increased the recovery of the adsorbed arsenic significantly; whereas, preparation of the slurry in 10% hydrochloric acid instead of water increased the recovery only when the microwave oven was off. Low recoveries, which were investigated by removing the hydride generation manifold and connecting the system via an on-line filter to an inductively coupled plasma mass spectrometer, were due to the irreversible adsorption of arsenic on the soil. This irreversible adsorption does not allow standard additions calibration. The solution detection limit was 0.2 ?g l?1 for a 212-?l injection loop, corresponding to 7 ng g?1 in solid for a 2.5% m/v slurry prepared in 25 ml.

Hakan Gürleyük; Julian F. Tyson; Peter C Uden

2000-01-01T23:59:59.000Z

382

Fluid seals development for coal liquefaction slurry pumps. Final report, 28 September 1982-31 January 1986. [Centrifugal and reciprocating pumps  

SciTech Connect

The results of a fluid seal developemnt program for coal liquefaction centrifugal and reciprocating slurry pumps are presented. The preliminary evaluation indicated that the best fluid seal concepts were the hydrostatic convergent tapered bore floating ring and the hydrostatic orifice compensated floating bushing. Detail evaluation and analysis were performed and the tapered bore floating ring seal was selected for final design and fabrication. The seal rings were constructed from solid tungsten carbide K68 with a convergent taper ratio of 2.0 and nominal diametral exit clearances of 0.002 to 0.003 inch. The laboratory testing demonstrated satisfactory leakage and negligible wear with synthetic slurry at typical field conditions. The centrifugal seals accumulated 72 hours with final leakage rates of 0.05 to 0.15 gpm. The reciprocating seals accumulated 63.3 hours with leadage rates of 0.04 to 0.05 gpm. The reciprocating seal field testing demonstrated successful field operation with actual process fluids. A total of 506 hours was daccumulated with no significant wear and leakage rates of 0.02 to 0.05 gpm. 32 refs., 143 figs., 32 tabs.

Burcham, R.E.; Keba, J.E.

1985-11-01T23:59:59.000Z

383

NETL: News Release - Jet Engine Successful in Fighting Mine Fire  

NLE Websites -- All DOE Office Websites (Extended Search)

2, 2003 2, 2003 Jet Engine Successful in Fighting Mine Fire Energy Department's Assistance Brings West Virginia Coal Miners Back To Work One Year Early - Australian Jet Engine Successfully Fights West Virginia Mine Fire - By blowing its exhaust into the underground mine, the modified jet engine was able to snuff out the mine fire much faster than traditional methods. FAIRVIEW, WV - A modified jet engine has been used to successfully fight a West Virginia mine fire that had been burning for nearly two months and was the cause of 300 employees being temporarily laid off when mine operations were idled. Positioned at the mouth of the one of the mineshafts, the jet engine was used to blow water vapor and inert gases into the mine to smother the fire by creating an inert environment underground. It was the

384

Rising Jet-Inflated Bubbles in Clusters of Galaxies  

E-Print Network (OSTI)

We conduct three-dimensional axisymmetric hydrodynamical numerical simulations of bubble evolution in clusters of galaxies. We inflate bubbles using slow, massive jets with a wide opening angle, and follow their evolution as they rise through the intra-cluster medium (ICM). We find that these jet-inflated bubbles are quite stable, and can reach large distances in the cluster while still maintaining their basic structure. The stability of the jet-inflated bubble comes mainly from the dense shell that forms around it during it's inflation stage, and from the outward momentum of the bubble and the shell. On the contrary, bubbles that are inserted by hand onto the grid and not inflated by a jet, i.e., an artificial bubble, lack these stabilizing factors, therefore, they are rapidly destroyed. The stability of the jet-inflated bubble removes the demand for stabilizing magnetic fields in the bubble.

Sternberg, Assaf

2008-01-01T23:59:59.000Z

385

Rising Jet-Inflated Bubbles in Clusters of Galaxies  

E-Print Network (OSTI)

We conduct two-dimensional axisymmetric (referred to as 2.5D) hydrodynamical numerical simulations of bubble evolution in clusters of galaxies. We inflate bubbles using slow, massive jets with a wide opening angle, and follow their evolution as they rise through the intra-cluster medium (ICM). We find that these jet-inflated bubbles are quite stable, and can reach large distances in the cluster while still maintaining their basic structure. The stability of the jet-inflated bubble comes mainly from the dense shell that forms around it during it's inflation stage, and from the outward momentum of the bubble and the shell. On the contrary, bubbles that are inserted by hand onto the grid and not inflated by a jet, i.e., an artificial bubble, lack these stabilizing factors, therefore, they are rapidly destroyed. The stability of the jet-inflated bubble removes the demand for stabilizing magnetic fields in the bubble.

Assaf Sternberg; Noam Soker

2008-05-15T23:59:59.000Z

386

Jet?vortex Interaction: A Numerical Study  

Science Journals Connector (OSTI)

The interaction of a vortex and a jet plays an important role for many industrial processes such as Carbon Black formation or combustion in diesel engines. The knowledge of physics of these phenomena is crucial for engineers but also for scientists who wish to reveal many interesting and complex issues hidden there. In this research we numerically investigate cases where a cylindrical reactor is charged with gas injected through five ports. The first one is located along the main axis of the cylinder and this leads to the formation of the main jet. The other four ports are situated along the side walls such that the gas entering the cylinder tangentially through them causes a vortex to be formed. The objective of this paper is to show the fundamental physical phenomena and also how the initial and boundary conditions influence the results. Our most important observation at this stage is that the mixing process is more intense if the vortex is inclined towards x?axis. The results are mainly shown as snapshots of gas velocity.

Catalin G. Ilea; Pawel Kosinski; Alex C. Hoffmann

2009-01-01T23:59:59.000Z

387

Effect of severity on catalytic hydroprocessed shale oil jet fuels  

SciTech Connect

Catalytic hydroprocessed shale oil jet fuels in the USA were characterized and compared with petroleum jet fuel to demonstrate their possibility as a conventional jet fuel substitute. The shale oils (Geokinetics, Occidental, Paraho and Tosco II) were hydrotreated in a 0.0508m ID by K1.524m long reactor containing Ni/Mo/Al/sub 2/O/sub 3/ catalyst. The fractionated hydrogenated shale oils at jet fuel ranges (120-300/degree/C) were analyzed for composition and physical properties. The increasing hydroprocessing severity proportionally decreased nitrogen, sulfur, olefins, aromatics and increased hydrogen content. The nitrogen content was considerable higher even at high severity conditions. Sulfur and olefin contents were lower at all severities. The heat of combustion and the physical properties, except the freezing point, were comparable to petroleum jet fuels. The yields of jet fuels increased proportionally to increased severity. The study showed that high severity hydroprocessing gave better performance in processing shale oils to jet fuels.

Mukherjee, N.L.

1987-01-01T23:59:59.000Z

388

Luminosity function and jet structure of Gamma Ray Bursts  

E-Print Network (OSTI)

The structure of Gamma Ray Burst (GRB) jets impacts on their prompt and afterglow emission properties. The jet of GRBs could be uniform, with constant energy per unit solid angle within the jet aperture, or it could instead be structured, namely with energy and velocity that depend on the angular distance from the axis of the jet. We try to get some insight about the still unknown structure of GRBs by studying their luminosity function. We show that low (1e46-1e48 erg/s) and high (i.e. with L > 1e50 erg/s) luminosity GRBs can be described by a unique luminosity function, which is also consistent with current lower limits in the intermediate luminosity range (1e48-1e50} erg/s). We derive analytical expressions for the luminosity function of GRBs in uniform and structured jet models and compare them with the data. Uniform jets can reproduce the entire luminosity function with reasonable values of the free parameters. A structured jet can also fit adequately the current data, provided that the energy within the ...

Pescalli, A; Salafia, O S; Ghisellini, G; Nappo, F; Salvaterra, R

2014-01-01T23:59:59.000Z

389

X-ray Emission Processes in Radio Jets  

E-Print Network (OSTI)

The emission processes responsible for the observed X-rays from radio jets are commonly believed to be non-thermal, but in any particular case, it is unclear if synchrotron emission or one or more varieties of inverse Compton emission predominates. We present a formulation of inverse Compton emission from a relativistically moving jet (``IC/beaming'') which relies on radio emitting synchrotron sources for which the energy densities in particles and fields are comparable. We include the non-isotropic nature of inverse Compton scattering of the relativistic electrons on photons of the cosmic microwave background (CMB) and provide beaming parameters for a number of jets. A list of X-ray emitting jets is given and the jets are classified on the basis of their morphology and spectral energy distribution to determine their likely emission process. We conclude that these jets have significant bulk relativistic velocities on kpc scales; that higher redshift sources require less beaming because the energy density of the CMB is significantly greater than locally; and that for some nearby sources, synchrotron X-ray emission predominates because the jet makes a large angle to the line of sight.

D. E. Harris; H. Krawczynski

2001-09-27T23:59:59.000Z

390

Drying: a comparison of radial jet reattachment and standard in-line jets  

E-Print Network (OSTI)

line of the nozzle but is shown in two dimensions as seen in the flow visualization. The flow rate of water corresponds to an exit velocity in air of approximately 75 meters per second, using Reynolds number similarity. The reattachment ring.... In this research endeavor, RJR nozzles have been compared to the drying industry's common method of air impingement drying, namely, standard In-Line Jets (ILJ), for several different combinations of flow and geometrical parameters. This gives evidence...

Habetz, Darren Keith

2012-06-07T23:59:59.000Z

391

ACCRETION-JET CONNECTION IN BLACK HOLES THE ORIGIN OF STELLAR BLACK HOLES &  

E-Print Network (OSTI)

a very large kinetic energy...Moon @ >.9c" #12;POWERFUL DARK JETS FROM BLACK HOLES Radio (Dubner et al erg/sec · NON RADIATIVE JETS = "DARK" JETS · >50% OF THE ENERGY IS NOT RADIATED 1o = 60 pc1arcsec VLA Since their discovery there have been seven International workshops Compact binaries with jets #12

Maryland at College Park, University of

392

Higher-Order Corrections to Timelike Jets  

SciTech Connect

We present a simple formalism for the evolution of timelike jets in which tree-level matrix element corrections can be systematically incorporated, up to arbitrary parton multiplicities and over all of phase space, in a way that exponentiates the matching corrections. The scheme is cast as a shower Markov chain which generates one single unweighted event sample, that can be passed to standard hadronization models. Remaining perturbative uncertainties are estimated by providing several alternative weight sets for the same events, at a relatively modest additional overhead. As an explicit example, we consider Z {yields} q{bar q} evolution with unpolarized, massless quarks and include several formally subleading improvements as well as matching to tree-level matrix elements through {alpha}{sub s}{sup 4}. The resulting algorithm is implemented in the publicly available VINCIA plugin to the PYTHIA8 event generator.

Giele, W.T.; /Fermilab; Kosower, D.A.; /Saclay, SPhT; Skands, P.Z.; /CERN

2011-02-01T23:59:59.000Z

393

Turbulent round jet under gravity waves  

E-Print Network (OSTI)

) Turbulent shear stress &u'w'&/&u, & versus z/x. . . 26 3-5 Overlapped mean axial velocity &u&/&u, & versus zJx of the case of A = 0. 5 cm at six locations corresponding to figure 3-4(a) . . 28 3-6 Horizontal turbulent velocity &u' &' /&u, & versus zJx... of the case of A = 0. 5 cm with z, = 0 at. the moving jet centerline in the range of (a) x/D = 40 - 95, (b) x/D = 40 ? 57, and (c) x/D = 64 - 95 . . 30 3-7 Vertical turbulent velocity &w' & /&u, & versus z Jx of the case of A = 0. 5 cm FIGURE Page with z...

Ryu, Yong Uk

2002-01-01T23:59:59.000Z

394

A FLUX ROPE ERUPTION TRIGGERED BY JETS  

SciTech Connect

We present an observation of a filament eruption caused by recurrent chromospheric plasma injections (surges/jets) on 2006 July 6. The filament eruption was associated with an M2.5 two-ribbon flare and a coronal mass ejection (CME). There was a light bridge in the umbra of the main sunspot of NOAA 10898; one end of the filament was terminated at the region close to the light bridge, and recurrent surges were observed to be ejected from the light bridge. The surges occurred intermittently for about 8 hr before the filament eruption, and finally a clear jet was found at the light bridge to trigger the filament eruption. We analyzed the evolutions of the relative darkness of the filament and the loaded mass by the continuous surges quantitatively. It was found that as the occurrence of the surges, the relative darkness of the filament body continued growing for about 3-4 hr, reached its maximum, and kept stable for more than 2 hr until it erupted. If suppose 50% of the ejected mass by the surges could be trapped by the filament channel, then the total loaded mass into the filament channelwill be about 0.57x10{sup 16} g with a momentum of 0.57x10{sup 22} g cm s{sup -1} by 08:08 UT, which is a non-negligible effect on the stability of the filament. Based on the observations, we present a model showing the important role that recurrent chromospheric mass injection play in the evolution and eruption of a flux rope. Our study confirms that the surge activities can efficiently supply the necessary material for some filament formation. Furthermore, our study indicates that the continuous mass with momentum loaded by the surge activities to the filament channel could make the filament unstable and cause it to erupt.

Guo Juan; Zhang Hongqi; Deng Yuanyong; Lin Jiaben; Su Jiangtao [Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012 (China); Liu Yu, E-mail: guojuan@bao.ac.c [Yunnan Astronomical Observatory, National Astronomical Observatories, Kunming 650011 (China)

2010-03-10T23:59:59.000Z

395

ePLAS Development for Jet Modeling and Applications  

SciTech Connect

Plasma jets provide an alternate approach to the creation of high energy density laboratory plasmas (HEDLP). For the Plasma Liner Experiment (PLX), typically 30 partially ionized argon jets, produced with mini-rail guns, will be focused into a central volume for subsequent magnetic compression into high density plasma liners that can reach high (0.1 Mbar) peak pressures upon stagnation. The jets are typically 2.5 cm in radius traveling at Mach number 30. Ultimate success will require optimized tuning of the rail configurations, the nozzles injecting the gases, and the careful implementation of pre-ionization. The modeling of plasma jet transport is particularly challenging, due the large space (100 sq cm) and time scales (microseconds) involved. Even traditional implicit methods are insufficient, due to the usual need to track electrons explicitly on the mesh. Wall emission and chemistry must be managed, as must ionization of the jet plasma. Ions in the jets are best followed as particles to account properly for collisions upon jet merger. This Phase I Project developed the code ePLAS to attack and successfully surmount many of these challenges. It invented a new 'super implicit' electromagnetic scheme, using implicit electron moment currents that allowed for modeling of jets over multi-cm and multi-picoseconds on standard, single processor 2 GHz PCs. It enabled merger studies of two jets, in preparation for the multi-jet merger problem. The Project explored particle modeling for the ions, and prepared for the future addition of a grid-base jet ion collision model. Access was added to tabular equations of state for the study of ionization effects in merging jets. The improved code was discussed at the primary plasma meetings (IEEE and APS) during the Project period. Collaborations with National Laboratory and industrial partners were nurtured. Code improvements were made to facilitate code use. See: http://www.researchapplicationscorp.com. The ePLAS code enjoys EAR99 export control treatment, permitting distribution to most foreign countries without a license.

Dr. Rodney J. Mason

2011-09-07T23:59:59.000Z

396

Pneumatic cleaning of sugarcane utilizing a high velocity air jet  

E-Print Network (OSTI)

- oped to cope with the increased amount of trash present in unburned sugarcane. This research involved the testing and computer simulation of a chopper air jet nozzle assembly. The experimental test setup included a two-stage conveyor. This conveyor... of cleaning produced by the system and the amount of momentum produced by the air jet. When unburned, untopped sugarcane was fed. into the chopper air jet nozzle assembly, a result of 9/~ trash in the bottom conveyor was achieved, A value of 14/ trash...

Fisher, John Ray

2012-06-07T23:59:59.000Z

397

Structure of the low level jet over Texas  

E-Print Network (OSTI)

STRUCTURE OF THE LOW LEVEL JET OVER TEXAS A Thesis by Michel Stuart Damiani Jr. Submitted to the Graduate College of Texas A&M University in partial fulfullment of the requirements for the degree of MASTER OF SCIENCE May 1979 Major Subject... Jet Over Texas (May, 1979) Michel S. Damiani Jr. , B. A. , Univ. of St. Thomas Directed by Dr. Dusan Djuric The intial stage of the low level jet has been studied over Texas and Oklahoma during the winter months of 1974 through 1976. The low level...

Damiani, Michel Stuart

2012-06-07T23:59:59.000Z

398

Simulation of the Interaction Between Two Counterflowing Rarefied Jets  

SciTech Connect

A preliminary analysis of the flow between a jet of argon plasma and one containing argon excited states is conducted using the direct simulation Monte Carlo method (DSMC). As a prelude to the use of more advanced models and to help design the accompanying experiment, a simplified model is formulated that ignores electron kinetics and field effects. This model allows the capture of most of the gas dynamics phenomena present with a standard DSMC code. Two interaction criteria are then used and compared to analyze the flow pattern of the interaction. An increase in the mass flow rate of the neutral jet is found to increase the level of interaction between the jets.

Galitzine, Cyril; Boyd, Iain D. [Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109 (United States)

2011-05-20T23:59:59.000Z

399

QCD corrections to Higgs-boson decay and jet analysis  

Science Journals Connector (OSTI)

We have calculated, within the framework of an on-shell renormalization scheme, the first-order QCD corrections to the rate of Higgs-boson decay to heavy quarks. Our analytic results are in complete agreement with those of Braaten and Leveille. We have also considered the Sterman-Weinberg jet structure for two- and three-jet decays of the Higgs boson. Here our results differ somewhat from those of Braaten and Leveille so we discuss the origin of this discrepancy; we extend their work by keeping the quark mass in the jet formulation.

Pat Kalyniak; Nita Sinha; Rahul Sinha; John N. Ng

1991-06-01T23:59:59.000Z

400

Slurry phase Fischer-Tropsch synthesis: Cobalt plus a water-gas shift catalyst. [Quarterly] report, June 30, 1988--September 30, 1988  

SciTech Connect

This report details experiments performed on three different copper-based catalysts: Cu/Cr{sub 2}O{sub 3}, Cu/MnO/Cr{sub 2}O{sub 3} and Cu/ZnO/Al{sub 2}O{sub 3}. Of these three catalysts, the Cu/ZnO/Al{sub 2}O{sub 3} exhibits the greatest stability when slurried in octacosane. More than 1000 hours-on-stream indicate that the catalyst activity is not detrimentally affected by high pressure, high H{sub 2}/CO ratio, or the presence of alkenes. All of these are necessary stability characteristics for the water-gas shift catalyst, if it is to be used in combination with a cobalt Fischer-Tropsch catalyst. A review of documented reduction procedures for cobalt-based Fischer-Tropsch catalysts is presented.

Yates, I.C.; Satterfield, C.N.

1988-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

The Different Configurations of the East Asian Polar Front Jet and Subtropical Jet and the Associated Rainfall Anomalies over Eastern China in Summer  

Science Journals Connector (OSTI)

To investigate the concurrent impacts of the East Asian polar front jet (EAPJ) and subtropical jet (EASJ) on the summer rainfall over eastern China, positive (strengthened EAPJ with weakened EASJ) and negative (weakened EAPJ with strengthened EASJ)...

Dan-Qing Huang; Jian Zhu; Yao-Cun Zhang; An-Ning Huang

2014-11-01T23:59:59.000Z

402

Eddy-mean flow interactions in western boundary current jets  

E-Print Network (OSTI)

This thesis examines the nature of eddy-mean flow interactions in western boundary current jets and recirculation gyre dynamics from both theoretical and observational perspectives. It includes theoretical studies of ...

Waterman, Stephanie N

2009-01-01T23:59:59.000Z

403

Elastic–plastic modelling of shaped charge jet penetration  

Science Journals Connector (OSTI)

...of shaped charge jet penetration Roman Novokshanov...modelling of high-rate penetration of a metal target by...best studied is that of penetration of an inviscid liquid...cavitating flow balancing the rate of change of momentum...

2006-01-01T23:59:59.000Z

404

Abrupt Changes in Confinement in the JET Tokamak  

Science Journals Connector (OSTI)

Analysis of a high performance plasma in JET has uncovered large abrupt changes in confinement. The change in the plasma configuration at these times is small and it appears that the confinement is not determined by the macroscopic plasma parameters.

J. A. Wesson and B. Balet

1996-12-23T23:59:59.000Z

405

Experimental High Velocity Acid Jetting in Limestone Carbonates  

E-Print Network (OSTI)

Acid jetting is a well stimulation technique that is used in carbonate reservoirs. It typically involves injecting acid down hole at high flow rates through small orifices which cause high velocities of acid to strike the borehole wall...

Holland, Christopher

2014-04-30T23:59:59.000Z

406

A device for debridement using high pressure water jets  

E-Print Network (OSTI)

Removing devitalized tissue from chronic wounds through debridement is critical to promote wound healing. In this thesis, technology using high-speed water jets is explored toward applications for debridement. After ...

Brown, Ashley (Ashley A.)

2014-01-01T23:59:59.000Z

407

GRAVITATIONAL WAVES OF JET PRECESSION IN GAMMA-RAY BURSTS  

SciTech Connect

The physical nature of gamma-ray bursts (GRBs) is believed to involve an ultra-relativistic jet. The observed complex structure of light curves motivates the idea of jet precession. In this work, we study the gravitational waves of jet precession based on neutrino-dominated accretion disks around black holes, which may account for the central engine of GRBs. In our model, the jet and the inner part of the disk may precess along with the black hole, which is driven by the outer part of the disk. Gravitational waves are therefore expected to be significant from this black-hole-inner-disk precession system. By comparing our numerical results with the sensitivity of some detectors, we find that it is possible for DECIGO and BBO to detect such gravitational waves, particularly for GRBs in the Local Group.

Sun Mouyuan; Liu Tong; Gu Weimin; Lu Jufu, E-mail: tongliu@xmu.edu.cn [Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian 361005 (China)

2012-06-10T23:59:59.000Z

408

Disintegration of Charged Liquid Jets: Results with Isopropyl Alcohol  

Science Journals Connector (OSTI)

...Disintegration of Charged Liquid Jets: Results with Isopropyl Alcohol 10.1126/science.168.3927.118 A. L. Huebner Rocketdyne Division of North American Rockwaell Corporation 6633 Canogoa A venue, Canoga Park, Colifornia 91304 Disintegration processes...

A. L. Huebner

1970-04-03T23:59:59.000Z

409

Modeling Dust Jets And Shells From Comet Hale-Bopp  

Science Journals Connector (OSTI)

Persistent jet and shell structures from comet Hale-Bopp showing gradual changes in the shapes ... declination. Lower limits on the dust and gas production rates at various epochs are presented.

R. Vasundhara; Pavan Chakraborty; Andreas Hänel; Erwin Heiser

410

Gamma ray burst emission: A jet and fireball model  

Science Journals Connector (OSTI)

We discuss some of the properties problems and implications of the jet and fireball model of gamma ray burst emission. This model was suggested by constraints on the opacity of MeV photons to photon?photon pair production.

Richard E. Lingenfelter; Geoffrey J. Hueter

1984-01-01T23:59:59.000Z

411

De-commoditizing the commercial jet engine business  

E-Print Network (OSTI)

This thesis project is a comprehensive application of the Delta Model at a major jet engine manufacturer. It will assess and contrast customer segmentation and customer value proposition via primary research. It will also ...

Soucy, Arthur L

2007-01-01T23:59:59.000Z

412

Science as Art: Jet Engine Airflow | GE Global Research  

NLE Websites -- All DOE Office Websites (Extended Search)

used heavily by GE Aviation, GE Power & Water, and GE Oil & Gas for the design of turbomachinery, e.g. jet engines, gas turbines, etc. I had the chance to talk with Brian to...

413

Hydrodynamics of Hypersonic Jets: Experiments and Numerical Simulations  

E-Print Network (OSTI)

Stars form in regions of the galaxy that are denser and cooler than the mean interstellar medium. These regions are called Giant Molecular Clouds. At the beginning of their life, up to $10^5-10^6$ years, stars accrete matter from their rich surrounding environment and are origin of a peculiar phenomenon that is the jet emission. Jets from Young Stellar Objects (YSOs) are intensively studied by the astrophysical community by observations at different wavelengths, analytical and numerical modeling and laboratory experiments. Indications about the jet propagation and its resulting morphologies are here obtained by means of a combined study of hypersonic jets carried out both in the laboratory and by numerical simulations.

Belan, Marco; Tordella, Daniela; Massaglia, Silvano; Ferrari, Attilio; Mignone, Andrea; Bodenschatz, Eberhard

2011-01-01T23:59:59.000Z

414

Jet energy scale uncertainty correlations between ATLAS and CMS  

E-Print Network (OSTI)

The correlation of the jet energy scale uncertainties between the ATLAS and CMS experiments are presented in this note. The uncertainty components for both experiments are grouped into categories. For each of these categories, the detailed

CMS Collaboration

2014-01-01T23:59:59.000Z

415

Modified jet calculus of Bassetto, Ciafaloni, and Marchesini  

Science Journals Connector (OSTI)

We reexamine some of the equations derived by Bassetto, Ciafaloni, and Marchesini for the various functions in their extended jet calculus, and derive an alternative set of equations based on the same concepts.

Lorella M. Jones and K. E. Lassila

1982-06-01T23:59:59.000Z

416

The reduction of supersonic jet noise using pulsed microjet injection  

E-Print Network (OSTI)

This thesis is concerned with the active control of supersonic jet noise using pulsed microjet injection at the nozzle exit. Experimental investigations were carried out using this control method on an ideally expanded ...

Ragaller, Paul Aaron

2007-01-01T23:59:59.000Z

417

Measurements of vector boson plus jets from ATLAS  

E-Print Network (OSTI)

Measurements of single W, Z boson production in association with jets probe QCD in multi-scale environment. Measurements of W+jet and Z+ jet production and their ratio, extending to high jet multiplicities, and studying a large set of kinematic distributions are presented for 7 TeV data. The results are compared to the predictions of modern Monte Carlo generators. Production of vector bosons plus heavy flavors studies c and b quark parton distribution functions (PDFs) and gluon splitting effects. Measurements of W + c and Z + b(b) are reported and compared to predictions based on various PDFs in 4 and 5 flavour schemes. An overview of the results is given.

Ninomiya, Y; The ATLAS collaboration

2014-01-01T23:59:59.000Z

418

The “Stress-drop Jet” in Lake Mendota  

Science Journals Connector (OSTI)

This phenomenon seems to be associated with a rapid decrease of wind stress on the lake surface. It is postulated that the energy for this “jet” is stored in the.

419

Horizontal Divergence Associated with Zonally Isolated Jet Streams  

Science Journals Connector (OSTI)

Horizontal divergence in the upper troposphere associated with zonally isolated jet streams in the climatological-mean fold for the Northern Hemisphere winter is examined by using the wind fields obtained from the NMC operational analyses in the ...

Hisashi Nakamura

1993-07-01T23:59:59.000Z

420

Fracture of brittle multiphase materials by high energy water jets  

Science Journals Connector (OSTI)

High energy water jets are established in processing brittle, inhomogeneous materials like rocks and concrete. Despite their wide ... of application, the failure mechanisms of these materials, especially the infl...

A. Momber; R. Kovacevic

1996-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Effective Field Theory for Higgs Plus Jet Production | Argonne...  

NLE Websites -- All DOE Office Websites (Extended Search)

includes all possible gluon-Higgs dimension-5 and dimension-7 operators to study Higgs boson plus jet production in next-to-leading order QCD. The EFT sheds light on the effect...

422

Hydrodynamical Simulations of Jet- and Wind-driven Protostellar Outflows  

E-Print Network (OSTI)

We present two-dimensional hydrodynamical simulations of both jet- and wind-driven models for protostellar outflows in order to make detailed comparisons to the kinematics of observed molecular outflows. Comparing the different simulations with observations, we find that some outflows, e.g., HH 212, show features consistent with the jet-driven model, while others, e.g., VLA 05487, are consistent with the wind-driven model.

Chin-Fei Lee; James M. Stone; Eve C. Ostriker; Lee G. Mundy

2001-04-23T23:59:59.000Z

423

Stress measurements in glass using shaped-charge jets  

Science Journals Connector (OSTI)

Stresses were measured in glass targets in the vicinity of a penetrating shaped-charge jet. Stress levels of approximately 0.3 \\{GPa\\} were measured 12–20mm away from a jet formed by a 35mm copper liner. High speed framing camera photographs showed that the penetration velocity in the glass was 2.57 km/s and the glass fracture velocity was 2.10 km/s.

William Lawrence; Robert E. Franz

1987-01-01T23:59:59.000Z

424

Jet Fragmentation in Medium and Vacuum with the PHENIX Detector  

E-Print Network (OSTI)

One of the most active areas of investigation in relativistic heavy-ion collisions is the study of the jet quenching phenomenon whereby hard partons lose their energy as they traverse the hot, dense matter created in such collisions. Strong parton energy loss has been observed in central nucleus-nucleus collisions as evidenced by the a large suppression of the yield of high pT hadrons as compared to the expected yield based on measurements in p+p collisions. Moreover, measurements of back-to-back correlations of charged hadrons suggest that jet shapes are strongly modified modified by the medium. The quantitative interpretation of single and di-hadron measurements is, however, complicated by the fact that the initial parton energy is unknown. A more informative measurement would be one in which the initial parton energy is known, allowing the determination of the fragmentation function, which may be effectively modified from its vacuum form by the presence of the medium. Two measurements in which the initial parton energy may be estimated are discussed in these proceedings: jet reconstruction and two- particle correlations using direct photons. Jet reconstruction in nuclear collisions is challenging due to the large background of soft particles, fluctuations of which give rise to fake jets. Direct photons can be used to estimate the initial parton energy of the recoil jet without recourse to jet reconstruction algorithms. However, such studies suffer from a smaller rate and the direct photon signal must be disentangled from a large background of decay photons. We present jet reconstruction results which use an algorithm suitable for a high multiplicity environment. We also present results of two-particle correlations using direct photons. These results are discussed in the context of medium modification to the fragmentation function.

Matthew Nguyen for the PHENIX Collaboration

2010-08-08T23:59:59.000Z

425

Jet energy scale uncertainty correlations between ATLAS and CMS  

E-Print Network (OSTI)

The correlation of the jet energy scale uncertainties between the ATLAS and CMS experiments are presented in this note. The uncertainty components for both experiments are grouped in categories. For each of these categories, the detailed comparison of the procedures to determine the jet calibration and its uncertainties allows to estimate a range for the correlation coefficient between the two experiments, ranging from 0 (uncorrelated) to 100\\% (fully correlated). This information can be used for the combination of ATLAS and CMS precision measurements.

The ATLAS collaboration

2014-01-01T23:59:59.000Z

426

A General Relativistic Magnetohydrodynamics Simulation of Jet Formation  

E-Print Network (OSTI)

We have performed a fully three-dimensional general relativistic magnetohydrodynamic (GRMHD) simulation of jet formation from a thin accretion disk around a Schwarzschild black hole with a free-falling corona. The initial simulation results show that a bipolar jet (velocity $\\sim 0.3c$) is created as shown by previous two-dimensional axisymmetric simulations with mirror symmetry at the equator. The 3-D simulation ran over one hundred light-crossing time units ($\\tau_{\\rm S} = r_{\\rm S}/c$ where $r_{\\rm S} \\equiv 2GM/c^2$) which is considerably longer than the previous simulations. We show that the jet is initially formed as predicted due in part to magnetic pressure from the twisting the initially uniform magnetic field and from gas pressure associated with shock formation in the region around $r = 3 r_{\\rm S}$. At later times, the accretion disk becomes thick and the jet fades resulting in a wind that is ejected from the surface of the thickened (torus-like) disk. It should be noted that no streaming matter from a donor is included at the outer boundary in the simulation (an isolated black hole not binary black hole). The wind flows outwards with a wider angle than the initial jet. The widening of the jet is consistent with the outward moving torsional Alfv\\'{e}n waves (TAWs). This evolution of disk-jet coupling suggests that the jet fades with a thickened accretion disk due to the lack of streaming material from an accompanying star.

K. -I. Nishikawa; G. Richardson; S. Koide; K. Shibata; T. Kudoh; P. Hardee; G. J. Fishman

2004-03-01T23:59:59.000Z

427

Jet plume injection and combustion system for internal combustion engines  

DOE Patents (OSTI)

An improved combustion system for an internal combustion engine is disclosed wherein a rich air/fuel mixture is furnished at high pressure to one or more jet plume generator cavities adjacent to a cylinder and then injected through one or more orifices from the cavities into the head space of the cylinder to form one or more turbulent jet plumes in the head space of the cylinder prior to ignition of the rich air/fuel mixture in the cavity of the jet plume generator. The portion of the rich air/fuel mixture remaining in the cavity of the generator is then ignited to provide a secondary jet, comprising incomplete combustion products which are injected into the cylinder to initiate combustion in the already formed turbulent jet plume. Formation of the turbulent jet plume in the head space of the cylinder prior to ignition has been found to yield a higher maximum combustion pressure in the cylinder, as well as shortening the time period to attain such a maximum pressure.

Oppenheim, Antoni K. (Kensington, CA); Maxson, James A. (Berkeley, CA); Hensinger, David M. (Albany, CA)

1993-01-01T23:59:59.000Z

428

Transverse liquid fuel jet breakup, burning, and ignition  

SciTech Connect

An analytical/numerical study of the breakup, burning, and ignition of liquid fuels injected transversely into a hot air stream is conducted. The non-reacting liquid jet breakup location is determined by the local sonic point criterion first proposed by Schetz, et al. (1980). Two models, one employing analysis of an elliptical jet cross-section and the other employing a two-dimensional blunt body to represent the transverse jet, have been used for sonic point calculations. An auxiliary criterion based on surface tension stability is used as a separate means of determining the breakup location. For the reacting liquid jet problem, a diffusion flame supported by a one-step chemical reaction within the gaseous boundary layer is solved along the ellipse surface in subsonic crossflow. Typical flame structures and concentration profiles have been calculated for various locations along the jet cross-section as a function of upstream Mach numbers. The integrated reaction rate along the jet cross-section is used to predict ignition position, which is found to be situated near the stagnation point. While a multi-step reaction is needed to represent the ignition process more accurately, the present calculation does yield reasonable predictions concerning ignition along a curved surface.

Li, H.

1990-01-01T23:59:59.000Z

429

Transverse liquid fuel jet breakup, burning, and ignition  

SciTech Connect

An analytical/numerical study of the breakup, burning, and ignition of liquid fuels injected transversely into a hot air stream is conducted. The non-reacting liquid jet breakup location is determined by the local sonic point criterion first proposed by Schetz, et al. (1980). Two models, one employing analysis of an elliptical jet cross-section and the other employing a two-dimensional blunt body to represent the transverse jet, have been used for sonic point calculations. An auxiliary criterion based on surface tension stability is used as a separate means of determining the breakup location. For the reacting liquid jet problem, a diffusion flame supported by a one-step chemical reaction within the gaseous boundary layer is solved along the ellipse surface in subsonic crossflow. Typical flame structures and concentration profiles have been calculated for various locations along the jet cross-section as a function of upstream Mach numbers. The integrated reaction rate along the jet cross-section is used to predict ignition position, which is found to be situated near the stagnation point. While a multi-step reaction is needed to represent the ignition process more accurately, the present calculation does yield reasonable predictions concerning ignition along a curved surface.

Li, H.

1990-12-31T23:59:59.000Z

430

Jet conversions in a quark-gluon plasma  

SciTech Connect

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic q(q)g{yields}gq(q) and the inelastic qq{r_reversible}gg scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net of quark jets to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the p/{pi}{sup +} and p/{pi}{sup -} ratios at high transverse momentum. However, a much larger net quark-to-gluon jet conversion rate than the one given by the lowest order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at the same energy. Implications of our results are discussed.

Liu, W.; Ko, C. M.; Zhang, B. W. [Cyclotron Institute and Physics Department, Texas A and M University, College Station, Texas 77843-3366 (United States)

2007-05-15T23:59:59.000Z

431

Inclusive Jet Spectra in p-Pb Collisions at ALICE  

E-Print Network (OSTI)

Jet suppression has been observed in central heavy ion collisions. This suppression is attributed to partonic energy loss in the Quark Gluon Plasma (QGP) formed in such collisions. However, this measurement is influenced by all stages of the collision. It is expected that in p-Pb collisions similar initial conditions occur as in Pb-Pb collisions without creating a QGP, allowing modification to the jet spectra due to cold nuclear matter effects to be quantified. Inclusive jet spectra in p-Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV measured by ALICE are presented. Jets are reconstructed via the anti-k$_{\\rm T}$ algorithm with different resolution parameters by combining charged tracks measured in the ALICE tracking system with the neutral energy deposited in the electromagnetic calorimeter. The jet spectra can be used to determine a nuclear modification factor $R_{\\rm pPb}$ while the jet profile in p-Pb is studied by dividing spectra measured with different resolution parameters and comparing to the same ratio measured in pp collisions.

Megan Connors; for the ALICE Collaboration

2014-09-11T23:59:59.000Z

432

Measurements of Vector Bosons Produced in Association with Jets  

SciTech Connect

The latest D0 and CDF measurements of the W + jets and Z/{gamma}* + jets processes are described, along with a discussion of the comparisons that have been made to LO and NLO perturbative QCD predictions. The direct production of W{sup {+-}}/Z bosons in association with jets is a process of crucial importance at hadron collider experiments. The presence of a vector boson in the hard scatter means that these interactions occur at a scale that should make perturbative QCD applicable, and thus it is an excellent channel to test such predictions. Furthermore, many of the potential discovery channels for the Higgs boson and beyond standard model processes share a final state signature with the W{sup {+-}}/Z + jets process. It is thus vital for the success of existing and future hadron collider experiments that this process is understood, and recently there has been a huge amount of work put into the modeling of this process, with the appearance of many new Monte Carlo generators that are already widely used at both the Tevatron and LHC. In Sections 2 and 3 the latest W + jets and Z/{gamma}* + jets measurements from the Tevatron are presented, and in Section 4 we discuss the results and implications of some of the theory comparisons that have thus far been made.

Cooper, Ben; /University Coll. London

2008-07-01T23:59:59.000Z

433

COUNTERROTATION IN MAGNETOCENTRIFUGALLY DRIVEN JETS AND OTHER WINDS  

SciTech Connect

Rotation measurement in jets from T Tauri stars is a rather difficult task. Some jets seem to be rotating in a direction opposite to that of the underlying disk, although it is not yet clear if this affects the totality or part of the outflows. On the other hand, Ulysses data also suggest that the solar wind may rotate in two opposite ways between the northern and southern hemispheres. We show that this result is not as surprising as it may seem and that it emerges naturally from the ideal MHD equations. Specifically, counterrotating jets neither contradict the magnetocentrifugal driving of the flow nor prevent extraction of angular momentum from the disk. The demonstration of this result is shown by combining the ideal MHD equations for steady axisymmetric flows. Provided that the jet is decelerated below some given threshold beyond the Alfven surface, the flow will change its direction of rotation locally or globally. Counterrotation is also possible for only some layers of the outflow at specific altitudes along the jet axis. We conclude that the counterrotation of winds or jets with respect to the source, star or disk, is not in contradiction with the magnetocentrifugal driving paradigm. This phenomenon may affect part of the outflow, either in one hemisphere, or only in some of the outflow layers. From a time-dependent simulation, we illustrate this effect and show that it may not be permanent.

Sauty, C.; Cayatte, V. [Laboratoire Univers et Theories, Observatoire de Paris, UMR 8102 du CNRS, Universite Paris Diderot, F-92190 Meudon (France); Lima, J. J. G. [Centro de Astrofisica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto (Portugal); Matsakos, T. [CEA, IRAMIS, Service Photons, Atomes et Molecules, F-91191 Gif-sur-Yvette (France); Tsinganos, K., E-mail: christophe.sauty@obspm.fr [IASA and Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, Panepistimiopolis GR-157 84, Zografos (Greece)

2012-11-01T23:59:59.000Z

434

Pulse Jet Mixing Tests With Noncohesive Solids  

SciTech Connect

This report summarizes results from pulse jet mixing (PJM) tests with noncohesive solids in Newtonian liquid conducted during FY 2007 and 2008 to support the design of mixing systems for the Hanford Waste Treatment and Immobilization Plant (WTP). Tests were conducted at three geometric scales using noncohesive simulants. The test data were used to independently develop mixing models that can be used to predict full-scale WTP vessel performance and to rate current WTP mixing system designs against two specific performance requirements. One requirement is to ensure that all solids have been disturbed during the mixing action, which is important to release gas from the solids. The second requirement is to maintain a suspended solids concentration below 20 weight percent at the pump inlet. The models predict the height to which solids will be lifted by the PJM action, and the minimum velocity needed to ensure all solids have been lifted from the floor. From the cloud height estimate we can calculate the concentration of solids at the pump inlet. The velocity needed to lift the solids is slightly more demanding than "disturbing" the solids, and is used as a surrogate for this metric. We applied the models to assess WTP mixing vessel performance with respect to the two perform¬ance requirements. Each mixing vessel was evaluated against these two criteria for two defined waste conditions. One of the wastes was defined by design limits and one was derived from Hanford waste characterization reports. The assessment predicts that three vessel types will satisfy the design criteria for all conditions evaluated. Seven vessel types will not satisfy the performance criteria used for any of the conditions evaluated. The remaining three vessel types provide varying assessments when the different particle characteristics are evaluated. The assessment predicts that three vessel types will satisfy the design criteria for all conditions evaluated. Seven vessel types will not satisfy the performance criteria used for any of the conditions evaluated. The remaining three vessel types provide varying assessments when the different particle characteristics are evaluated. The HLP-022 vessel was also evaluated using 12 m/s pulse jet velocity with 6-in. nozzles, and this design also did not satisfy the criteria for all of the conditions evaluated.

Meyer, Perry A.; Bamberger, Judith A.; Enderlin, Carl W.; Fort, James A.; Wells, Beric E.; Sundaram, S. K.; Scott, Paul A.; Minette, Michael J.; Smith, Gary L.; Burns, Carolyn A.; Greenwood, Margaret S.; Morgen, Gerald P.; Baer, Ellen BK; Snyder, Sandra F.; White, Michael; Piepel, Gregory F.; Amidan, Brett G.; Heredia-Langner, Alejandro; Bailey, Sharon A.; Bower, John C.; Denslow, Kayte M.; Eakin, David E.; Elmore, Monte R.; Gauglitz, Phillip A.; Guzman, Anthony D.; Hatchell, Brian K.; Hopkins, Derek F.; Hurley, David E.; Johnson, Michael D.; Kirihara, Leslie J.; Lawler, Bruce D.; Loveland, Jesse S.; Mullen, O Dennis; Pekour, Mikhail S.; Peters, Timothy J.; Robinson, Peter J.; Russcher, Michael S.; Sande, Susan; Santoso, Christian; Shoemaker, Steven V.; Silva, Steve M.; Smith, Devin E.; Su, Yin-Fong; Toth, James J.; Wiberg, John D.; Yu, Xiao-Ying; Zuljevic, Nino

2009-05-11T23:59:59.000Z

435

Zonal Flow as Pattern Formation: Merging Jets and the Ultimate Jet Length Scale  

SciTech Connect

Zonal flows are well known to arise spontaneously out of turbulence. It is shown that for statisti- cally averaged equations of quasigeostrophic turbulence on a beta plane, zonal flows and inhomoge- neous turbulence fit into the framework of pattern formation. There are many implications. First, the zonal flow wavelength is not unique. Indeed, in an idealized, infinite system, any wavelength within a certain continuous band corresponds to a solution. Second, of these wavelengths, only those within a smaller subband are linearly stable. Unstable wavelengths must evolve to reach a stable wavelength; this process manifests as merging jets.

Jeffrey B. Parker and John A. Krommes

2013-01-30T23:59:59.000Z

436

A 'BOOSTED FIREBALL' MODEL FOR STRUCTURED RELATIVISTIC JETS  

SciTech Connect

We present a model for relativistic jets which generates a particular angular distribution of Lorentz factor and energy per solid angle. We consider a fireball with specific internal energy E/M launched with bulk Lorentz factor ? {sub B}. In its center-of-momentum frame the fireball expands isotropically, converting its internal energy into radially expanding flow with asymptotic Lorentz factor ?{sub 0} ? E/M. In the lab frame the flow is beamed, expanding with Lorentz factor ? = 2?{sub 0}? {sub B} in the direction of its initial bulk motion and with characteristic opening angle ?{sub 0} ? 1/? {sub B}. The flow is jet-like with ??{sub 0} ? 2?{sub 0} such that jets with ? > 1/?{sub 0} are naturally produced. The choice ?{sub 0} ? ? {sub B} ? 10 yields a jet with ? ? 200 on-axis and angular structure characterized by opening angle ?{sub 0} ? 0.1 of relevance for cosmological gamma-ray bursts (GRBs), while ? {sub B} ?> 1 may be relevant for low-luminosity GRBs. The model produces a family of outflows, of relevance for different relativistic phenomena with structures completely determined by ?{sub 0} and ? {sub B}. We calculate the energy per unit solid angle for the model and use it to compute light curves for comparison with the widely used top-hat model. The jet break in the boosted fireball light curve is greatly subdued when compared to the top-hat model because the edge of the jet is smoother than for a top-hat. This may explain missing jet breaks in afterglow light curves.

Duffell, Paul C.; MacFadyen, Andrew I., E-mail: pcd233@nyu.edu, E-mail: macfadyen@nyu.edu [Center for Cosmology and Particle Physics, New York University, NY (United States)

2013-10-10T23:59:59.000Z

437

Measurement of the ratio of inclusive cross sections ?(pp¯?Z+b-quark jet)/?(pp¯?Z+jet) at s=1.96??TeV  

Science Journals Connector (OSTI)

The ratio of the cross section for pp¯ interactions producing a Z boson and at least one b-quark jet to the inclusive Z+jet cross section is measured using 4.2??fb-1 of pp¯ collisions collected with the D0 detector at the Fermilab Tevatron collider at s=1.96??TeV. The Z??+?- candidate events with at least one b jet are discriminated from Z+charm and light jet(s) events by a novel technique that exploits the properties of the tracks associated to the jet. The measured ratio is 0.0193±0.0027 for events having a jet with transverse momentum pT>20??GeV and pseudorapidity |?|?2.5, which is the most precise to date and is consistent with theoretical predictions.

V. M. Abazov et al. (D0 Collaboration)

2011-02-28T23:59:59.000Z

438

Pulse Jet Mixing Tests With Noncohesive Solids  

SciTech Connect

This report summarizes results from pulse jet mixing (PJM) tests with noncohesive solids in Newtonian liquid. The tests were conducted during FY 2007 and 2008 to support the design of mixing systems for the Hanford Waste Treatment and Immobilization Plant (WTP). Tests were conducted at three geometric scales using noncohesive simulants, and the test data were used to develop models predicting two measures of mixing performance for full-scale WTP vessels. The models predict the cloud height (the height to which solids will be lifted by the PJM action) and the critical suspension velocity (the minimum velocity needed to ensure all solids are suspended off the floor, though not fully mixed). From the cloud height, the concentration of solids at the pump inlet can be estimated. The predicted critical suspension velocity for lifting all solids is not precisely the same as the mixing requirement for 'disturbing' a sufficient volume of solids, but the values will be similar and closely related. These predictive models were successfully benchmarked against larger scale tests and compared well with results from computational fluid dynamics simulations. The application of the models to assess mixing in WTP vessels is illustrated in examples for 13 distinct designs and selected operational conditions. The values selected for these examples are not final; thus, the estimates of performance should not be interpreted as final conclusions of design adequacy or inadequacy. However, this work does reveal that several vessels may require adjustments to design, operating features, or waste feed properties to ensure confidence in operation. The models described in this report will prove to be valuable engineering tools to evaluate options as designs are finalized for the WTP. Revision 1 refines data sets used for model development and summarizes models developed since the completion of Revision 0.

Meyer, Perry A.; Bamberger, Judith A.; Enderlin, Carl W.; Fort, James A.; Wells, Beric E.; Sundaram, S. K.; Scott, Paul A.; Minette, Michael J.; Smith, Gary L.; Burns, Carolyn A.; Greenwood, Margaret S.; Morgen, Gerald P.; Baer, Ellen BK; Snyder, Sandra F.; White, Michael K.; Piepel, Gregory F.; Amidan, Brett G.; Heredia-Langner, Alejandro

2012-02-17T23:59:59.000Z

439

Jet Noise Contribution to Wind Noise in Vehicles  

Science Journals Connector (OSTI)

A source of “wind noise” in a vehicle with a slightly opened window has been modeled as a slit jet issuing from a plenum (idealized vehicle). The nondimensional power spectra measured inside and outside were quite similar; the curves collapsed together well when plotted against Strouhal number fD/U (f=frequency D=slit width U=jet nozzle velocity). The higher frequency sources of the jet noise being closer to the slit subtend a larger angle and would be expected to transmit more noise into the plenum. This expectation was confirmed with inward transmission increasing with both frequency and slit width; at 10 000 Hz and 1.5?in. slit width (maxima for these experiments with 80?fps jet velocity) the jet noise power transmitted inward through the slit reached 68% of the power emitted externally in the 1 3 ? oct band. These were exploratory tests and there was no external wind. [Work supported by Air Force Office of Scientific Research.

C.?K. A. Yu; H. S. Ribner

1971-01-01T23:59:59.000Z

440

Implementation And Performance of the ATLAS Second Level Jet Trigger  

SciTech Connect

ATLAS is one of the four major LHC experiments, designed to cover a wide range of physics topics. In order to cope with a rate of 40MHz and 25 interactions per bunch crossing, the ATLAS trigger system is divided in three different levels. The jet selection starts at first level with dedicated processors that search for high E{sub T} hadronic energy depositions. At the LVL2, the jet signatures are verified with the execution of a dedicated, fast jet reconstruction algorithm, followed by a calibration algorithm. Three possible granularities have been proposed and are being evaluated: cell based (standard), energy sums calculated at each Front-End Board and the use of the LVL1 Trigger Towers. In this presentation, the design and implementation of the jet trigger of ATLAS will be discussed in detail, emphasazing the major difficulties of each selection step. The performance of the jet algorithm, including timing, efficiencies and rates will also be shown, with detailed comparisons of the different unpacking modes.

Conde Muino, Patricia; /Lisbon, LIFEP; Aracena, I.; /SLAC; Brelier, B.; /Montreal U.; Cranmer, K.; /Brookhaven; Delsart, P.A.; /Montreal U.; Dufour, M.A.; /McGill U.; Eckweiler, S.; /Mainz U., Inst. Phys.; Ferland, J.; /Montreal U.; Idarraga, J.; /Montreal U.; Johns, K.; /Arizona U.; LeCompte, T.; /Argonne; Potter, C.; Robertson, S.; Santamarina Rios, C.; /McGill U.; Segura, E.; /Barcelona, IFAE; Silverstein, D.; /SLAC; Vachon, B.; /McGill U.

2011-11-09T23:59:59.000Z

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Jet conversions in a quark-gluon plasma  

E-Print Network (OSTI)

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic $q(\\bar q)g\\to gq(\\bar q)$ and the inelastic $q\\bar q\\leftrightarrow gg$ scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net conversion of quark to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the $p/\\pi^+$ and ${\\bar p}/\\pi^-$ ratios at high transverse momentum. However, a much larger net quark to gluon jet conversion rate than the one given by the lowest-order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at same energy. Implications of our results are discussed.

W. Liu; C. M. Ko; B. W. Zhang

2006-07-21T23:59:59.000Z

442

The response of the Red Sea to a strong wind jet near the Tokar Gap in summer.  

E-Print Network (OSTI)

??Remote sensing and in situ observations are used to investigate the ocean response to the Tokar Wind Jet in the Red Sea. The wind jet… (more)

Zhai, Ping

2011-01-01T23:59:59.000Z

443

An artificial neural network based $b$ jet identification algorithm at the CDF Experiment  

E-Print Network (OSTI)

We present the development and validation of a new multivariate $b$ jet identification algorithm ("$b$ tagger") used at the CDF experiment at the Fermilab Tevatron. At collider experiments, $b$ taggers allow one to distinguish particle jets containing $B$ hadrons from other jets. Employing feed-forward neural network architectures, this tagger is unique in its emphasis on using information from individual tracks. This tagger not only contains the usual advantages of a multivariate technique such as maximal use of information in a jet and tunable purity/efficiency operating points, but is also capable of evaluating jets with only a single track. To demonstrate the effectiveness of the tagger, we employ a novel method wherein we calculate the false tag rate and tag efficiency as a function of the placement of a lower threshold on a jet's neural network output value in $Z+1$ jet and $t\\bar{t}$ candidate samples, rich in light flavor and $b$ jets, respectively.

J. Freeman; W. Ketchum; J. D. Lewis; S. Poprocki; A. Pronko; V. Rusu; P. Wittich

2011-08-24T23:59:59.000Z

444

Mesoscale Convective Systems in Relation to African and Tropical Easterly Jets  

Science Journals Connector (OSTI)

This paper documents the interaction processes between mesoscale convective systems (MCS), the tropical easterly jet (TEJ), and the African easterly jet (AEJ) over West Africa during the monsoon peak of 2006 observed during the African Monsoon ...

L. Besson; Y. Lemaître

2014-09-01T23:59:59.000Z

445

Optimal dimensionless design and analysis of jet ejectors as compressors and thrust augmenters  

E-Print Network (OSTI)

A jet ejector may be used as a compressor or to enhance thrust of watercraft or aircraft. Optimization of jet ejectors as compressors and thrust augmenters was conducted using the software GAMBIT (Computer Aided Engineering (CAE) tool for geometry...

Mohan, Ganesh

2006-08-16T23:59:59.000Z

446

Distinguishing the Cold Conveyor Belt and Sting Jet Airstreams in an Intense Extratropical Cyclone  

Science Journals Connector (OSTI)

Strong winds equatorward and rearward of a cyclone core have often been associated with two phenomena: the cold conveyor belt (CCB) jet and sting jets. Here, detailed observations of the mesoscale structure in this region of an intense cyclone are ...

Oscar Martínez-Alvarado; Laura H. Baker; Suzanne L. Gray; John Methven; Robert S. Plant

2014-08-01T23:59:59.000Z

447

Capturing the Impact of Fuel Price on Jet Aircraft Operating Costs with Engineering and Econometric Models  

E-Print Network (OSTI)

Capturing the Impact of Fuel Price on Jet Aircraft OperatingCapturing the Impact of Fuel Price on Jet Aircraft Operatingare in part due to fuel price uncertainty. To address this

Smirti Ryerson, Megan; Hansen, Mark

2009-01-01T23:59:59.000Z

448

Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D  

E-Print Network (OSTI)

High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet ...

Hollmann, E. M.

449

On the ratio between shifts in the eddy-driven jet and the Hadley cell edge  

Science Journals Connector (OSTI)

This study explores the relationship between latitudinal shifts in the eddy-driven jet and in the Hadley cell edge as depicted in models and ... 1 between the eddy-driven jet and the Hadley cell edge over the Sou...

Paul W. Staten; Thomas Reichler

2014-03-01T23:59:59.000Z

450

Jet Production in ep Collisions at Low Q^2 and Determination of $\\alpha_{s}$  

E-Print Network (OSTI)

The production of jets is studied in deep-inelastic e+p scattering at low negative four momentum transfer squared 5jet, 2-jet and 3-jet cross sections as well as the ratio of 3-jet to 2-jet cross sections are measured as a function of Q^2 and jet transverse momentum. The 2-jet cross section is also measured as a function of the proton momentum fraction xi. The measurements are well described by perturbative quantum chromodynamics at next-to-leading order corrected for hadronisation effects and are subsequently used to extract the strong coupling alpha_s.

Aaron, FD; Alexa, C; Andreev, V; Antunovic, B; Backovic, S; Baghdasaryan, A; Barrelet, E; Bartel, W; Begzsuren, K; Belousov, A; Bizot, J C; Boudry, V; Bozovic-Jelisavcic, I; Bracinik, J; Brandt, G; Brinkmann, M; Brisson, V; Bruncko, D; Bunyatyan, A; Buschhorn, G; Bystritskaya, L; Campbell, A J; Cantun Avila, K B; Cerny, K; Cerny, V; Chekelian, V; Cholewa, A; Contreras, J G; Coughlan, J A; Cozzika, G; Cvach, J; Dainton, J B; Daum, K; Deak, M; Delcourt, B; Delvax, J; De Wolf, E A; Diaconu, C; Dodonov, V; Dossanov, A; Dubak, A; Eckerlin, G; Efremenko, V; Egli, S; Eliseev, A; Elsen, E; Falkiewicz, A; Favart, L; Fedotov, A; Felst, R; Feltesse, J; Ferencei, J; Fischer, D J; Fleischer, M; Fomenko, A; Gabathuler, E; Gayler, J; Ghazaryan, Samvel; Glazov, A; Glushkov, I; Goerlich, L; Gogitidze, N; Gouzevitch, M; Grab, C; Greenshaw, T; Grell, B R; Grindhammer, G; Habib, S; Haidt, D; Helebrant, C; Henderson, R C W; Hennekemper, E; Henschel, H; Herbst, M; Herrera, G; Hildebrandt, M; Hiller, K H; Hoffmann, D; Horisberger, R; Hreus, T; Jacquet, M; Janssen, X; Jonsson, L; Jung, A W; Jung, H; Kapichine, M; Katzy, J; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Kluge, T; Knutsson, A; Kogler, R; Kosior, E; Kostka, P; Kraemer, M; Krastev, K; Kretzschmar, J; Kropivnitskaya, A; Kruger, K; Kutak, K; Landon, M P J; Lange, W; Lastovicka-Medin, G; Laycock, P; Lebedev, A; Lendermann, V; Levonian, S; Li, G; Lipka, K; Liptaj, A; List, B; List, J; Loktionova, N; Lopez-Fernandez, R; Lubimov, V; Makankine, A; Malinovski, E; Marage, P; Marti, Ll; Martyn, H U; Maxfield, S J; Mehta, A; Meyer, A B; Meyer, H; Meyer, H; Meyer, J; Mikocki, S; Milcewicz-Mika, I; Moreau, F; Morozov, A; Morris, J V; Mozer, M U; Mudrinic, M; Muller, K; Murin, P; Naumann, Th; Newman, P R; Niebuhr, C; Nikiforov, A; Nikitin, D; Nowak, G; Nowak, K; Olsson, J E; Osman, S; Ozerov, D; Palichik, V; Panagoulias, I; Pandurovic, M; Papadopoulou, Th; Pascaud, C; Patel, G D; Pejchal, O; Perez, E; Petrukhin, A; Picuric, I; Piec, S; Pitzl, D; Placakyte, R; Pokorny, B; Polifka, R; Povh, B; Radescu, V; Rahmat, A J; Raicevic, N; Raspiareza, A; Ravdandorj, T; Reimer, P; Rizvi, E; Robmann, P; Roland, B; Roosen, R; Rostovtsev, A; Rotaru, M; Tabasco, J E Ruiz; Rusakov, S; Salek, D; Sankey, D P C; Sauter, M; Sauvan, E; Schmitt, S; Schoeffel, L; Schoning, A; Schultz-Coulon, H C; Sefkow, F; Shaw-West, R N; Shtarkov, L N; Shushkevich, S; Sloan, T; Smiljanic, Ivan; Soloviev, Y; Sopicki, P; South, D; Spaskov, V; Specka, A; Staykova, Z; Steder, M; Stella, B; Stoicea, G; Straumann, U; Sunar, D; Sykora, T; Tchoulakov, V; Thompson, G; Thompson, P D; Toll, T; Tomasz, F; Tran, T H; Traynor, D; Trinh, T N; Truol, P; Tsakov, I; Tseepeldorj, B; Turnau, J; Urban, K; Valkarova, A; Vallee, C; Van Mechelen, P; Trevino, A Vargas; Vazdik, Y; Vinokurova, S; Volchinski, V; von den Driesch, M; Wegener, D; Wissing, Ch; Wunsch, E; Zacek, J; Zalesak, J; Zhang, Z; Zhokin, A; Zimmermann, T; Zohrabyan, H; Zomer, F

2010-01-01T23:59:59.000Z

451

Precise Predictions for Z + 4 Jets at Hadron Colliders  

SciTech Connect

We present the cross section for production of a Z boson in association with four jets at the Large Hadron Collider, at next-to-leading order in the QCD coupling. When the Z decays to neutrinos, this process is a key irreducible background to many searches for new physics. Its computation has been made feasible through the development of the on-shell approach to perturbative quantum field theory. We present the total cross section for pp collisions at {radical}s = 7 TeV, after folding in the decay of the Z boson, or virtual photon, to a charged-lepton pair. We also provide distributions of the transverse momenta of the four jets, and we compare cross sections and distributions to the corresponding ones for the production of a W boson with accompanying jets.

Ita, H.; Bern, Z.; Dixon, L.J.; Cordero, F.Febres; Kosower, D.A.; Maitre, D.

2011-12-09T23:59:59.000Z

452

Integrated coke, asphalt and jet fuel production process and apparatus  

DOE Patents (OSTI)

A process and apparatus for the production of coke, asphalt and jet fuel m a feed of fossil fuels containing volatile carbon compounds therein is disclosed. The process includes the steps of pyrolyzing the feed in an entrained bed pyrolyzing means, separating the volatile pyrolysis products from the solid pyrolysis products removing at least one coke from the solid pyrolysis products, fractionating the volatile pyrolysis products to produce an overhead stream and a bottom stream which is useful as asphalt for road pavement, condensing the overhead stream to produce a condensed liquid fraction and a noncondensable, gaseous fraction, and removing water from the condensed liquid fraction to produce a jet fuel-containing product. The disclosed apparatus is useful for practicing the foregoing process. the process provides a useful method of mass producing and jet fuels from materials such as coal, oil shale and tar sands.

Shang, Jer Y. (McLean, VA)

1991-01-01T23:59:59.000Z

453

The Physics of Gamma-Ray Bursts and Relativistic Jets  

E-Print Network (OSTI)

We provide a comprehensive review of major developments in our understanding of gamma-ray bursts, with particular focus on the discoveries made within the last fifteen years when their true nature was uncovered. We describe the observational properties of photons from the radio to multi-GeV bands, both in the prompt emission and the afterglow phases. Mechanisms for the generation of these photons in GRBs are discussed and confronted with observations to shed light on the physical properties of these explosions, their progenitor stars and the surrounding medium. After presenting observational evidence that a powerful, collimated, jet moving at close to the speed of light is produced in these explosions, we describe our current understanding regarding the generation, acceleration, and dissipation of the jet and compare these properties with jets associated with AGNs and pulsars. We discuss mounting observational evidence that long duration GRBs are produced when massive stars die, and that at least some short d...

Kumar, Pawan

2014-01-01T23:59:59.000Z

454

Radiation from relativistic jets in turbulent magnetic fields  

SciTech Connect

Using our new 3-D relativistic electromagnetic particle (REMP) code parallelized with MPI, we have investigated long-term particle acceleration associated with an relativistic electron-positron jet propagating in an unmagnetized ambient electron-positron plasma. The simulations have been performed using a much longer simulation system than our previous simulations in order to investigate the full nonlinear stage of the Weibel instability and its particle acceleration mechanism. Cold jet electrons are thermalized and ambient electrons are accelerated in the resulting shocks. The acceleration of ambient electrons leads to a maximum ambient electron density three times larger than the original value. Behind the bow shock in the jet shock strong electromagnetic fields are generated. These fields may lead to the afterglow emission. We have calculated the time evolution of the spectrum from two electrons propagating in a uniform parallel magnetic field to verify the technique.

Nishikawa, K.-I.; Mizuno, Y. [National Space Science and Technology Center, Huntsville, AL 35805 (United States); Medvedev, M. [Department of Physics and Astronomy, University of Kansas, KS 66045 (United States); Zhang, B. [Department of Physics, University of Nevada, Las Vegas, NV 89154 (United States); Hardee, P. [Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487 (United States); Niemiec, J. [Institute of Nuclear Physics PAN, ul. Radzikowskiego 152, 31-342 Krakow (Poland); Nordlund, A.; Frederiksen, J. [Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Oe (Denmark); Sol, H. [LUTH, Observatore de Paris-Meudon, 5 place Jules Jansen, 92195 Meudon Cedex (France); Fishman, G. J. [NASA/MSFC, Huntsville, AL 35805 (United States)

2009-05-25T23:59:59.000Z

455

Color coherence in multi-jet final states  

E-Print Network (OSTI)

We discuss coherent QCD radiation from space-like parton branching and its effects on multi-jet final states at high-energy hadron colliders. Coherence effects for small longitudinal momentum fractions x are not included in the branching algorithms of standard shower Monte Carlo event generators. On the other hand, they are taken into account only partially in perturbative next-to-leading-order calculations for multi-jets. Such effects are present to all orders in alpha_s and can become logarithmically enhanced with \\sqrt{s} / E_T, where E_T is the hardest jet transverse energy. We present results of summing coherence effects to all orders by parton-branching Monte Carlo methods based on transverse-momentum dependent matrix elements.

F. Hautmann; H. Jung

2008-12-16T23:59:59.000Z

456

Single-Phase Self-Oscillating Jets for Enhanced Heat Transfer: Preprint  

SciTech Connect

Self-oscillating jets have potential to cool insulated gate bipolar transistors in vehicle power electronics modules.

Narumanchi, S.; Kelly, K.; Mihalic, M.; Gopalan, S.; Hester, R.; Vlahinos, A.

2008-06-01T23:59:59.000Z

457

The scour of cohesive soils by an inclined submerged water jet  

E-Print Network (OSTI)

into the channel reducing its navigable depth, and causes lateral retreat as a result of slope instability. Also, the study of cohesive incline scour can be applied to improving the efficiency of jet assisted draghead dredging as described by Herbich (12... efficient translation of the impinging jet to the wall jet reducing the center line nozmal pressure. Also, as predicted by Eg. 17 the kinetic energy of the jet decreased with increasing distance away from the orifice. Thus, the normal surface pressure...

Hedges, Joseph Delbert

2012-06-07T23:59:59.000Z

458

Method and apparatus for removing heat from electronic devices using synthetic jets  

DOE Patents (OSTI)

An apparatus for removing heat comprises a heat sink having a cavity, and a synthetic jet stack comprising at least one synthetic jet mounted within the cavity. At least one rod and at least one engaging structure to provide a rigid positioning of the at least one synthetic jet with respect to the at least one rod. The synthetic jet comprises at least one orifice through which a fluid is ejected.

Sharma, Rajdeep; Weaver, Jr., Stanton Earl; Seeley, Charles Erklin; Arik, Mehmet; Icoz, Tunc; Wolfe, Jr., Charles Franklin; Utturkar, Yogen Vishwas

2014-04-15T23:59:59.000Z

459

Studies of forward jets and production of W, Z bosons at LHC energies  

E-Print Network (OSTI)

We report on application of QCD in calculations of forward jet and W, Z boson production cross sections at the Large Hadron Collider. In particular in case of jet production we emphasize dynamical features of the matrix elements controlling the resummation of logarithmically enhanced corrections in $\\sqrt{s}/E_T$, where $E_T$ is the jet production transverse energy. In case of production of W, Z bosons we focus on angular correlations between produced boson and hardest associated jet.

K. Kutak

2009-11-08T23:59:59.000Z

460

Gas Jet Disruption Mitigation Studies on Alcator C-Mod and DIII-D  

E-Print Network (OSTI)

Gas Jet Disruption Mitigation Studies on Alcator C-Mod and DIII-D R.S. Granetz1, E.M. Hollmann2, D-pressure noble gas jet High-pressure noble gas jets can mitigate 3 problems arising from disruptions, without molybdenum Be, W, C #12;Specific goals of these DIII-D and C-Mod gas jet experiments · Determine penetration

Note: This page contains sample records for the topic "abrasive slurry jet" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Dynamics of quasi-two-dimensional turbulent jets  

E-Print Network (OSTI)

In turbulent jets, fluid is driven by momentum from an orifice into an environ- ment filled with similar fluid. The complexity of this flow, which has been studied for more than 80 years (see e.g. List, 1982, for a detailed review), resides in its turbulent... in time with an accuracy of approximately 1 %. We conducted two distinct sets of experiments using two qualitatively different techniques: dye tracking and particle image velocimetry (PIV). 7 2 Meandering and self-similarity of quasi-two-dimensional jets x...

Landel, Julien Rémy Dominique Gérard

2012-11-13T23:59:59.000Z

462

Sivers Single-Spin Asymmetry in Photon-Jet Production  

SciTech Connect

We study a weighted asymmetry in the azimuthal distribution of photon-jet pairs produced in the process p{sup {up_arrow}}p{yields}{gamma} jet X with a transversely polarized proton. We focus on the contribution of the Sivers effect only, considering experimental configurations accessible at the Relativistic Heavy Ion Collider. We show that predictions for the asymmetry, obtained in terms of gluonic-pole cross sections calculable in perturbative QCD, can be tested and clearly discriminated from those based on a generalized parton model, involving standard partonic cross sections. Experimental measurements of the asymmetry will therefore test our present understanding of single-spin asymmetries.

Bacchetta, Alessandro [Theory Group, Deutsches Elektronen-Synchroton DESY, 22603 Hamburg (Germany); Bomhof, Cedran; Mulders, Piet J. [Department of Physics and Astronomy, Vrije Universiteit Amsterdam, 1081 HV Amsterdam (Netherlands); D'Alesio, Umberto; Murgia, Francesco [INFN, Sezione di Cagliari and Dipartimento di Fisica, Universita di Cagliari, 09042 Monserrato (Italy)

2007-11-23T23:59:59.000Z

463

Measurement of multi-jet cross sections at ATLAS  

E-Print Network (OSTI)

Inclusive multi-jet production is studied using the ATLAS detector for proton-proton collisions with a center-of-mass energy of 7 TeV. The data sample corresponds to an integrated luminosity of 2.43 pb^-1, using the first proton-proton data collected by the ATLAS detector in 2010. Results on multi-jet cross sections are presented and compared to both leading-order plus parton-shower Monte Carlo predictions and next-to-leading-order QCD calculations.

Matthew Tamsett on behalf of the ATLAS collaboration

2011-09-30T23:59:59.000Z

464

Superclean coal-water slurry combustion testing in an oil-fired boiler. Quarterly technical progress report, November 15, 1989--February 15, 1990  

SciTech Connect

The Pennsylvania State University is conducting a superclean coal-water slurry (SCCWS) program for the US Department of Energy (DOE) and the Commonwealth of Pennsylvania with the objective of demonstrating the capability of effectively firing SCCWS in industrial boilers designed for oil. Penn State has entered into a cooperative agreement with DOE to determine if SCCWS (a fuel containing coal with less than 3% ash and 0.9% sulfur) can effectively be burned in oil-designed industrial boilers without adverse impact on boiler rating, maintainability, reliability, and availability. The project will provide information on the design of new systems specifically configured to fire these clean coal-based fuels. The project consists of three phases: (1) design, permitting, and test planning, (2) construction and start up, and (3) operations and disposition. The boiler testing will determine if the SCCWS combustion characteristics, heat release rate, slagging and fouling factors, erosion and corrosion limits, and fuel transport, storage, and handling can be accommodated in an oil-designed boiler. In addition, the proof-of-concept demonstration will generate data to determine how the properties of SCCWS and its parent coal affect boiler performance. Economic factors associated with retrofitting and operating boilers will be identified to assess the viability of future oil-to-coal retrofits. Progress for this quarter is summarized.

Miller, B.G.; Walsh, P.M.; Elston, J.T.; Scaroni, A.W.

1990-04-06T23:59:59.000Z

465

Superclean coal-water slurry combustion testing in an oil-fired boiler. Semiannual technical progress report, August 15, 1992--February 15, 1993  

SciTech Connect

The Pennsylvania State University is conducting a superclean coal-water slurry (SCCWS) program for the United States Department of Energy (DOE) and the Commonwealth of Pennsylvania with the objective of determining the capability of effectively firing SCCWS in an industrial boiler designed for heavy fuel oil. Penn State has entered into a cooperative agreement with DOE to determine if SCCWS (a fuel containing coal with 3.0 wt.% ash and 0.9 wt.% sulfur) can effectively be burned in a heavy fuel oil-designed industrial boiler without adverse impact on boiler rating, maintainability, reliability, and availability. The project will provide information on the design of new systems specifically configured to fire these clean coal-based fuels. The project consists of four phases: (1) design, permitting, and test planning, (2) construction and start up, (3) demonstration and evaluation (1,000-hour demonstration), and (4) program expansion (additional 1,000 hours of testing). The boiler testing wig determine if the SCCWS combustion characteristics, heat release rate, fouling and slagging behavior, corrosion and erosion limits, and fuel transport, storage, and handling characteristics can be accommodated in an oil-designed boiler system. In addition, the proof-of-concept demonstration will generate data to determine how the properties of SCCWS and its parent coal affect boiler performance. Economic factors associated with retrofitting boilers will be identified

Miller, B.G.; Pisupati, S.V.; Poe, R.L.; Morrison, J.L.; Xie, J.; Walsh, P.M.; Wincek, R.T.; Clark, D.A.; Scaroni, A.W.

1993-04-21T23:59:59.000Z

466

t-tbar cross-section at Tevatron Lepton + jets channel  

E-Print Network (OSTI)

energy resolution: ­ Muons are of two types: ­ CMX ­ eta = 0.6..1.0 ­ CMUP ­ eta microns #12;II-b/c. Calorimetry and muons Outside of the tracker and solenoid Eta : isolated EM clusters in CEM matching XFT track ­ Jets use cone: 0.4 Standard jet energy corrections Jet

467

Protozoa in Subsurface Sediments from Sites Contaminated with Aviation Gasoline or Jet Fuel  

Science Journals Connector (OSTI)

...with Aviation Gasoline or Jet Fuel James L. Sinclair 1 * Don H...of aviation gasoline and jet fuel spill areas at a Coast Guard...aerobic bacteria, protozoa, algae, and fungae in deep subsurface...aviation gasoline and JP-4 jet fuel in subsurface core samples...

James L. Sinclair; Don H. Kampbell; Mike L. Cook; John T. Wilson

1993-02-01T23:59:59.000Z

468

Interplay of discharge and gas flow in atmospheric pressure plasma jets Nan Jiang,1  

E-Print Network (OSTI)

Interplay of discharge and gas flow in atmospheric pressure plasma jets Nan Jiang,1 JingLong Yang,2 2011) Interplay of discharge and gas flow in the atmospheric pressure plasma jets generated with three:10.1063/1.3581067] I. INTRODUCTION The atmospheric pressure plasma jet (APPJ) that is nor- mally

Zexian, Cao

469

Annual Report of the EURATOM/CCFE Fusion Programme 2009/10 3 JET Operations  

E-Print Network (OSTI)

of experimental programme operations, on 24 October. The EP2 shutdown activity managed and conducted by CCFE Operations 3.2 OPERATIONS OVERVIEW JET commissioning and operation is conducted in a shift pattern, with twoAnnual Report of the EURATOM/CCFE Fusion Programme 2009/10 3.1 3 JET Operations 3 JET Operations 3

470

Jet Measurements and Extraction of the Strong Coupling Constant at HERA  

E-Print Network (OSTI)

Results on jet measurements in neutral current deep inelastic scattering at HERA are presented. The low-$x_{Bj}$ and low-$Q^2$ region is explicitly investigated using forward jet production and the azimuthal asymmetry between jets in dijet production. Recent results on the determination of the strong coupling constant, $\\alpha_s(M_Z)$, are discussed.

A. A. Savin

2005-05-22T23:59:59.000Z

471

Introduction Idealized Moist Jet/Front Waves Ray Tracing Momentum Flux/Forcing Conclusion Gravity Waves  

E-Print Network (OSTI)

Introduction Idealized Moist Jet/Front Waves Ray Tracing Momentum Flux/Forcing Conclusion Gravity Waves in Moist Baroclinic Jet-Front Systems Junhong Wei, Fuqing Zhang Department of Meteorology The Pennsylvania State University Tuesday 19th August, 2014 #12;Introduction Idealized Moist Jet/Front Waves Ray

Thompson, Anne

472

Market Cost of Renewable Jet Fuel Adoption in the United States  

E-Print Network (OSTI)

a small impact on the average price of jet fuel and carbon dioxide emissions. We also find thatMarket Cost of Renewable Jet Fuel Adoption in the United States Niven Winchester, Dominic Mc on recycled paper #12;1 Market Cost of Renewable Jet Fuel Adoption in the United States Niven Winchester

473

Annual Report 2002 5.2. A fast mercury jet entering a 20 T  

E-Print Network (OSTI)

of the camera system (~ 0.33 mm/pixel). The damping of disrupted jets, simulated with highly turbulent jets disruptions. With increasing field, the tip gets thinner. On injecting a mercury jet into a magnetic field://www.cap.bnl.gov/mumu/studyii/ [2] GHMFL, Annual Report 2001 [3] A. Fabich, High Power Proton Beam Shocks and Magnetohydrodynamics

McDonald, Kirk

474

ComputerScience,TexasA&MUniversity JetMax: Scalable Max-Min  

E-Print Network (OSTI)

1 ComputerScience,TexasA&MUniversity JetMax: Scalable Max-Min Congestion Control for High- Speed Heterogeneous Networks JetMax: Scalable MaxJetMax: Scalable Max--MinMin Congestion Control for High congestion control and its designed properties · Analysis of existing max-min methods XCP, MKC, and MKC

Loguinov, Dmitri

475

Numerical simulation of turbulent jet primary breakup in Diesel engines  

E-Print Network (OSTI)

Numerical simulation of turbulent jet primary breakup in Diesel engines Peng Zeng1 Marcus Herrmann and Aerospace Engineering Arizona State University "Micro-Macro Modelling and Simulation of Liquid-Vapour Flows" IRMA Strasbourg, 23.Jan.2008 #12;Introduction DNS of Primary Breakup in Diesel Injection Phase

Helluy, Philippe

476

Chromospheric Anemone Jets as Evidence of Ubiquitous Reconnection  

Science Journals Connector (OSTI)

...Two-dimensional magnetohydrodynamic (MHD) numerical simulations of reconnection between...reconnection mechanism. Fig. 4. Time-distance diagram of Ca intensity (running differences) along Ca jets...solar winds in coronal holes (24, 25). MHD simulations (26, 27) showed that about...

Kazunari Shibata; Tahei Nakamura; Takuma Matsumoto; Kenichi Otsuji; Takenori J. Okamoto; Naoto Nishizuka; Tomoko Kawate; Hiroko Watanabe; Shin'ichi Nagata; Satoru UeNo; Reizaburo Kitai; Satoshi Nozawa; Saku Tsuneta; Yoshinori Suematsu; Kiyoshi Ichimoto; Toshifumi Shimizu; Yukio Katsukawa; Theodore D. Tarbell; Thomas E. Berger; Bruce W. Lites; Richard A. Shine; Alan M. Title

2007-12-07T23:59:59.000Z

477

LOFT as a discovery machine for jetted Tidal Disruption Events  

E-Print Network (OSTI)

This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT for the study of jetted tidal disruption events. For a summary, we refer to the paper.

Rossi, E M; Fender, R; Jonker, P; Komossa, S; Paragi, Z; Prandoni, I; Zampieri, L

2015-01-01T23:59:59.000Z

478

TT2A Mercury Jet Experiment The Cryogenic  

E-Print Network (OSTI)

TT2A Mercury Jet Experiment The Cryogenic System Roger Bennett and Yury Ivanyushenkov CCLRC "SPECIFICATION" of the cryogenic cycle is: 1. Initial fill of the magnet cryostat slowly over many hours -12 at CERN, December 2004, drawn by Peter Titus #12;Design and Costing of the Cryogenic System 1. The input

McDonald, Kirk

479

Characteristics of Impinging Reacting Jet Flow on Flat Surface  

Science Journals Connector (OSTI)

The objectives of this study are to determine the combustion characteristic and combustion efficiency of premixed flame jet impinging on a plane