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Note: This page contains sample records for the topic "dispersion manifolds perforated" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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1

Dispersal  

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

Dispersal Dispersal Nature Bulletin No. 675-A April 15, 1978 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation SEED DISPERSAL Plants that scatter their seeds widely have a better chance to survive than those which do not. Different kinds spread their seeds in various special ways. Many seeds ride the wind. Maple seeds spin away like little helicopters with a single wing. In a strong breeze they can travel a city block. Those of the elm are small papery disks with a seed in the center. The ash seed and its wing resembles a canoe paddle. In the basswood a few seeds are suspended beneath a large flat blade that glides through the air. Ripe, dry pine cones open and release winged seeds hidden between the cone scales.

2

Evaluating underbalanced perforating conditions  

Science Conference Proceedings (OSTI)

This paper presents an evaluation model which also predicts effects on the wireline gun system and allows formations to be aggressively perforated with optimum safe underbalanced pressure. Closed chamber techniques can be added to accurately evaluate completion efficiency.

Manohar, M.M.; Morris, C.W.; Hill, D.D. (Schlumberger Well Services (US)); Brunner, S.R. (Chevron USA Inc. (US))

1990-11-01T23:59:59.000Z

3

Manifold constrained variational mixtures  

Science Conference Proceedings (OSTI)

In many data mining applications, the data manifold is of lower dimension than the dimension of the input space. In this paper, it is proposed to take advantage of this additional information in the frame of variational mixtures. The responsibilities ...

Cédric Archambeau; Michel Verleysen

2005-09-01T23:59:59.000Z

4

Dual manifold heat pipe evaporator  

DOE Patents (OSTI)

An improved evaporator section is described for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes. 1 figure.

Adkins, D.R.; Rawlinson, K.S.

1994-01-04T23:59:59.000Z

5

Dual manifold heat pipe evaporator  

DOE Patents (OSTI)

An improved evaporator section for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes.

Adkins, Douglas R. (Albuquerque, NM); Rawlinson, K. Scott (Albuquerque, NM)

1994-01-01T23:59:59.000Z

6

Three-dimensional manifolds  

E-Print Network (OSTI)

. Lemma (11. 1 ) • 1Cl ( Q=#=R) ;: 1Cl Ui~1Cl CR). If S is not essential in Q;# R, then either Q or R is a homotppy 3-sphere ( and therefore a compact 3-manifold wi thout boundary). The isomorphism is a consequence of van Kampen ' s Theorem...

Epstein, David Alper

1960-08-03T23:59:59.000Z

7

Parabolic flows on complex manifolds.  

E-Print Network (OSTI)

??We prove C ? convergence for suitably normalized solutions of the parabolic complex Monge-Ampère equation on compact Hermitian manifolds. This provides a parabolic proof of… (more)

Gill, Matthew Franklin

2012-01-01T23:59:59.000Z

8

Analysis and evaluation of perforating and perforation cleanup methods  

Science Conference Proceedings (OSTI)

Fifty-two completions made in the Gulf of Mexico between June, 1978, and May, 1982, have been analyzed to evaluate three commonly used techniques for perforating and cleaning up the perforations prior to gravel packing. Since detailed flowing bottom hole pressure information was not available in all cases, a method was developed to evaluate the completion efficiencies using an in-house computer program. This computer program models well performance by simultaneously solving the equations governing fluid flow in the reservoir, the near wellbore region, the gravel packed perforation tunnels, and up the production tubing. The results showed that perforating underbalanced with a tubing conveyed casing gun yielded more efficient completions than the other two techniques.

Bonomo, J.N.; Young, W.S.

1983-10-01T23:59:59.000Z

9

Light Field Appearance Manifolds  

E-Print Network (OSTI)

Abstract. Statistical shape and texture appearance models are powerful image representations, but previously had been restricted to 2D or 3D shapes with smooth surfaces and lambertian reflectance. In this paper we present a novel 3D appearance model using image-based rendering techniques, which can represent complex lighting conditions, structures, and surfaces. We construct a light field manifold capturing the multi-view appearance of an object class and extend the direct search algorithm of Cootes and Taylor to match new light fields or 2D images of an object to a point on this manifold. When matching to a 2D image the reconstructed light field can be used to render unseen views of the object. Our technique differs from previous view-based active appearance models in that model coefficients between views are explicitly linked, and that we do not model any pose variation within the shape model at a single view. It overcomes the limitations of polygonal based appearance models and uses light fields that are acquired in real-time. 1

Chris Mario Christoudias; Trevor Darrell

2004-01-01T23:59:59.000Z

10

Special Holonomy Manifolds in Physics  

E-Print Network (OSTI)

This is a pedagogical exposition of holonomy groups intended for physicists. After some pertinent definitions, we focus on special holonomy manifolds, two per division algebras, and comment upon several cases of interest in physics, associated with compactification from F-, M- and string theory, on manifolds of 8, 7 and 6 dimensions respectively.

Luis J. Boya

2006-12-01T23:59:59.000Z

11

Manifold methods for methane combustion  

SciTech Connect

Objective is to develop a new method for studying realistic chemistry in turbulent methane combustion with NO{sub x} mechanism. The realistic chemistry is a simplification to a more detailed chemistry based on the manifold method; accuracy is determined by interaction between the transport process and the chemical reaction. In this new (tree) method, probability density function or partially stirred reactor calculations are performed. Compared with the reduced mechanism, manifold, and tabulation methods, the new method overcomes drawbacks of the reduced mechanism method and preserves the advantages of the manifold method. Accuracy is achieved by specifying the size of the cell.

Yang, B.; Pope, S.B. [Cornell Univ., Ithaca, NY (United States)

1995-12-31T23:59:59.000Z

12

Glove Perforations During Interventional Radiological Procedures  

SciTech Connect

Intact surgical gloves are essential to avoid contact with blood and other body fluids. The objective of this study was to estimate the incidence of glove perforations during interventional radiological procedures. In this study, a total of 758 gloves used in 94 interventional radiological procedures were examined for perforations. Eleven perforations were encountered, only one of which was of occult type. No significant difference in the frequency of glove perforation was found between the categories with varying time duration.

Leena, R. V., E-mail: leenarv_76@yahoo.co.uk; Shyamkumar, N. K. [Christian Medial College, Department of Radiodiagnosis (India)

2010-04-15T23:59:59.000Z

13

Pressure responsive perforating and testing system  

Science Conference Proceedings (OSTI)

In accordance with an illustrative embodiment of the present invention, a well perforating and testing system includes packer and test valve means for respectively isolating a well bore interval and controlling flow of well fluids therefrom, a perforating gun connected below the packer means, and firing means responsive to a greater pressure in the well annulus above the packer means than in said isolated interval for actuating the perforating gun so theat the casing can be perforated at underbalanced pressure conditions.

Upchurch, J. M.

1985-04-09T23:59:59.000Z

14

Real Scalar Fields on Manifolds  

E-Print Network (OSTI)

A generic theory of a single real scalar field is considered, and a simple method is presented for obtaining a class of solutions to the equation of motion. These solutions are obtained from a simpler equation of motion that is generated by replacing a set of the original coordinates by a set of generalized coordinates, which are harmonic functions in the spacetime. These ansatz solutions solve the original equation of motion on manifolds that are defined by simple constraints. These manifolds, and their dynamics, are independent of the form of the scalar potential. Some scalar field solutions, and manifolds upon which they exist, are presented for Klein-Gordon and quartic potentials as examples. Solutions existing on leaves of a foliated space may allow inferences of the characteristics expected of exact bulk solutions.

J. R. Morris

2008-10-03T23:59:59.000Z

15

How to avoid perforating problems  

Science Conference Proceedings (OSTI)

This article cautions that the literature on perforating technology can be confusing when you try to apply it to a real situation. Most of the basic information is easy to understand. But as more lab studies and computer modeling studies are published, it becomes more difficult to decide what parameters are important. A review of the current literature can lead to the conclusion that a well capable of producing 10 MMcfd of gas may be restricted to less that 1.0 MMcfd by the perforations. Locke's publication in 1981 showed the effects of shot penetration depth on well productivities. He noted that various investigators agree that deeper penetration does improve results, although there is some disagreement over the absolute amount of improvement among them. From these data, one may expect that if 9-in. penetrations are achieved with a 90/sup 0/ phased perforating gun, at four shots per foot, a well would be stimulated by approximately 10 percent over what might be expected from an open hole completion.

Sparlin, D.

1987-07-01T23:59:59.000Z

16

A field study of underbalance pressures necessary to obtain clean perforations using tubing-conveyed perforating  

Science Conference Proceedings (OSTI)

A study of 90 wells perforated with the tubing-conveyed perforating system showed a correlation between underbalanced pressure and formation permeability that can be used to achieve clean perforations. The data, from gas and oil producers in clean sandstones, are from wells that were perforated, tested, acidized, and retested. There is a clear minimum underbalance line separating the data sets of wells that had clean perforations (unassisted by acidizing) from those wells that showed a significant productivity increase after acidizing. The study includes data from oil and gas wells in the Gulf of Mexico, Lousiana (Tuscaloosa trend), New Mexico (Morrow sandstone), Rocky Mountain overthrust, and Alberta, Canada.

King, G.E.; Anderson, A.R.; Ringham, M.D.

1986-06-01T23:59:59.000Z

17

Laser Rock Perforation Demo - The NE Multimedia Collection  

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

rock perforation demo High power laser beam can be used in oil well completion application for perforating oil reservoir rock and increasing rock's permeability for high oil...

18

Extreme overbalance perforating improves well performance  

Science Conference Proceedings (OSTI)

The application of extreme overbalance perforating, by Oryx Energy Co., is consistently outperforming the unpredictable, tubing-conveyed, underbalance perforating method which is generally accepted as the industry standard. Successful results reported from more than 60 Oryx Energy wells, applying this technology, support this claim. Oryx began this project in 1990 to address the less-than-predictable performance of underbalanced perforating. The goal was to improve the initial completion efficiency, translating it into higher profits resulting from earlier product sales. This article presents the concept, mechanics, procedures, potential applications and results of perforating using overpressured well bores. The procedure can also be used in wells with existing perforations if an overpressured surge is used. This article highlights some of the case histories that have used these techniques.

Dees, J.M.; Handren, P.J. [Oryx Energy Co., Dallas, TX (United States)

1994-01-01T23:59:59.000Z

19

Pressure-activated well perforating apparatus  

Science Conference Proceedings (OSTI)

A well perforating technique utilizes a predetermined pressure difference developed at different points in the borehole to actuate the firing mechanism of a tubing conveyed perforating gun. A first embodiment incorporated as part of a well test string includes a packer for isolating a wellbore interval and a perforating gun connected in the string below the packer which is fired in response to development of a greater pressure in the annulus above the packer than in the isolated interval, thereby causing perforation at ''underbalanced'' conditions. A modified ''full-bore'' embodiment has an annular configuration firing mechanism as part of a tubing string and fires the perforating gun in response to development of a predetermined difference between the pressures at a point in the annulus and a point in the central bore of the tubing string.

Upchurch, J. M.

1985-12-24T23:59:59.000Z

20

Conformal vector fields on Finsler manifolds  

E-Print Network (OSTI)

Applying concepts and tools from classical tangent bundle geometry and using the apparatus of the calculus along the tangent bundle projection ('pull-back formalism'), first we enrich the known lists of the characterizations of affine vector fields on a spray manifold and conformal vector fields on a Finsler manifold. Second, we deduce consequences on vector fields on the underlying manifold of a Finsler structure having one or two of the mentioned geometric properties.

Szilasi, József

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Backsurging perforations can increase production rates  

Science Conference Proceedings (OSTI)

Subjecting formations to a large pressure differential or underbalance is a common means of surging perforations to remove damage and increase flow from oil and gas wells. Underbalanced perforating, a standard industry completion technique, is normally used to obtain the pressure differentials intended to dislodge debris from perforations and flush the surrounding compacted zone. Gradually applied pressure underbalance can be achieved by swabbing or jetting to reduce hydrostatic head. Suddenly applied underbalance is achieved by evacuating the tubing in conjunction with a rupture disc, tubing-conveyed perforating systems or by using a new wireline-set, through-tubing backsurge tool. These techniques, except for the through-tubing method, are often utilized only during later workovers due to the expense and difficulty of achieving an adequate underbalance. Many operators prefer to perforate in balanced or overbalanced pressures conditions. This typically leaves perforations completely or partially plugged with gun debris, mud solids and shattered formation material that has been recompacted. Production logging shows that wells often produce from only 10 to 20% of the total interval apparently because of ineffective, plugged perforations.

Brieger, E.F.

1991-07-01T23:59:59.000Z

22

Analysis and evaluation of perforating cleanup methods  

Science Conference Proceedings (OSTI)

Fifty-two completions made in the Gulf of Mexico between June 1978 and May 1982 have been analyzed to evaluate three commonly used techniques for perforating and cleaning up perforations before gravel packing. Since detailed flowing bottomhole pressure (BHP) information was not available in all cases, a method was developed to evaluate the completion efficiencies by using an inhouse computer program. This program models well performance by simultaneously solving the equations governing fluid flow in the reservoir, the near-wellbore region, the gravel-packed perforation tunnels, and up the production tubing. The results showed that perforating underbalanced with a tubing-conveyed casing gun yielded more efficient completions than the other two techniques.

Bonomo, J.M.; Young, W.S.

1985-03-01T23:59:59.000Z

23

Optimal Transportation on Sub-Riemannian Manifolds  

E-Print Network (OSTI)

Optimal Transportation on Sub-Riemannian Manifolds Ludovic Rifford Universit´e de Nice - Sophia Antipolis (Joint work with A. Figalli) Ludovic Rifford Optimal Transportation on Sub-Riemannian Manifolds #12;Monge's Optimal Transportation Problem Let M be a separable metric space equipped with its Borel

Rifford, Ludovic

24

Optimal Transportation on Sub-Riemannian Manifolds  

E-Print Network (OSTI)

Optimal Transportation on Sub-Riemannian Manifolds Ludovic Rifford Universit´e de Nice - Sophia Antipolis (Joint work with A. Figalli) Ludovic Rifford Optimal Transportation on Sub-Riemannian Manifolds #12;Outline I. Statement of our optimal transportation problem II. Sketch of proof of the Mc

Rifford, Ludovic

25

Heterotic Model Building: 16 Special Manifolds  

E-Print Network (OSTI)

We study heterotic model building on 16 specific Calabi-Yau manifolds constructed as hypersurfaces in toric four-folds. These 16 manifolds are the only ones among the more than half a billion manifolds in the Kreuzer-Skarke list with a non-trivial first fundamental group. We classify the line bundle models on these manifolds, both for SU(5) and SO(10) GUTs, which lead to consistent supersymmetric string vacua and have three chiral families. A total of about 29000 models is found, most of them corresponding to SO(10) GUTs. These models constitute a starting point for detailed heterotic model building on Calabi-Yau manifolds in the Kreuzer-Skarke list. The data for these models can be downloaded here: http://www-thphys.physics.ox.ac.uk/projects/CalabiYau/toricdata/index.html

Yang-Hui He; Seung-Joo Lee; Andre Lukas; Chuang Sun

2013-09-01T23:59:59.000Z

26

Orientable closed 3-manifolds with surface-complexity one  

E-Print Network (OSTI)

After a short summary of known results on surface-complexity of closed 3-manifolds, we will classify all closed orientable 3-manifolds with surface-complexity one.

Amendola, Gennaro

2010-01-01T23:59:59.000Z

27

Yang- Mills on Quantum Heisenberg Manifolds  

E-Print Network (OSTI)

In the noncommutative geometry program of Connes there are two variations of the concept of Yang-Mills action functional. We show that for the quantum Heisenberg manifolds they agree.

Partha Sarathi Chakraborty; Satyajit Guin

2013-04-29T23:59:59.000Z

28

String orientations of simplicial homology manifolds  

E-Print Network (OSTI)

Simplicial homology manifolds are proposed as an interesting class of geometric objects, more general than topological manifolds but still quite tractable, in which questions about the microstructure of space-time can be naturally formulated. Their string orientations are classified by $H^3$ with coefficients in an extension of the usual group of D-brane charges, by cobordism classes of homology three-spheres with trivial Rokhlin invariant.

Jack Morava

2008-07-11T23:59:59.000Z

29

High differential pressure, radial flow characteristics of gun perforations  

Science Conference Proceedings (OSTI)

Tubing conveyed completion techniques are being utilized more frequently than in the past, because of the apparent advantages derived from underbalanced perforating. These advantages include cleaner perforations, reductions of additional stimulation treatments and reduced completion times. This paper presents the results of a laboratory study of gun perforations made under high differential pressure, radial flow conditions. In this study, Berea sandstone cores, modified to permit radial flow, are used to determine the relationship between perforation characteristics and the time-dependent pressure differential between pore pressure (i.e. formation pressure) and ''well bore'' pressure during the completion process. The primary perforation characteristic investigated (Radial Flow Ratio) is defined as the ratio of the perforated flow rate to the flow rate of the unperforated core under identical conditions. The perforated flow rate is measured in radial flow after the perforation has been made under various time-dependent pressure differentials.

Regalbuto, J.A.; Riggs, R.S.

1985-01-01T23:59:59.000Z

30

Dispersant solutions for dispersing hydrocarbons  

DOE Patents (OSTI)

A dispersant solution includes a hydrocarbon dispersing solution derived from a bacterium from ATCC 75527, ATCC 75529, or ATCC 55638.

Tyndall, Richard L. (Clinton, TN)

1997-01-01T23:59:59.000Z

31

Twistorial Constructions of Special Riemannian Manifolds  

SciTech Connect

We use twistor theory to describe virtually new constructions of Hermitian and quaternionic Kaehler structures on tangent bundles and a G{sub 2} structure on the unit sphere tangent bundle of a Riemannian 4-manifold--fundamental to holonomy theory and subject of deep research in physics.We interpret 'self-holomorphic' complex structures on a symplectic manifold. These complex structures give an interesting set of problems in the first possible dimension, the case of Riemann surfaces, from which should follow some interplay with Teichmuller theory, as well as with SL(2) connections.

Albuquerque, Rui [Departamento de Matematica da Universidade de Evora and Centro de Investigacao em Matematica e Aplicacoes (CIMA), Rua Romao Ramalho, 59, 7000 Evora (Portugal)

2008-06-25T23:59:59.000Z

32

Analyses and applications of pressure, flow rate, and temperature measurements during a perforating run. [Measurement while perforating  

Science Conference Proceedings (OSTI)

Perforating technology has undergone significant advances during the last decade. Tubing-conveyed perforating, underbalanced perforating, high-shot-density guns, better shaped charges, and improved gun systems have contributed to safer operations and improved productivity of the perforated completions. A recent development described in this paper is a perforating tool that makes real-time downhole measurements (including pressure, flow rate, temperature, gamma ray, casing-collar locator (CCL), and cable tension) during a perforating run and can selectively fire a number of guns at different depths or times. In addition to providing better control of the perforating process, the simultaneous downhole measurements can provide in a single trip a production log, conventional well tests before and after perforating, and a fill-up or slug test soon after perforating for underbalanced conditions. Thus, the completion can be evaluated in real time and any needed remedial reperforating can be performed while the gun is still in the hole. Other applications include limited-entry perforating, monitoring of bottomhole pressure (BHP) during minifracture jobs, better depth control with a gamma ray detector, fluid-level monitoring, and underbalance control. The applications of these measurements, with field data obtained with the Measurement While Perforating (MWP{sup SM}) tool, are the subject of this paper. Examples show the capabilities and the versatility of the MWP tool.

Tariq, S.M. (Schlumberger Perforating and Testing Center (US)); Ayestaran, L.C. (Schlumberger Well Services (US))

1991-02-01T23:59:59.000Z

33

Perforating devices for use in wells  

DOE Patents (OSTI)

The perforating device for use in completing a well includes a case, an explosive charge contained in the case, and a generally bowl-shaped liner. The liner is positioned adjacent the explosive charge and has non-uniforrn thickness along its length. The liner further includes a protruding portion near its tip. In another configuration, the liner includes a hole near its tip to expose a portion of the explosive charge.

Jacoby, Jerome J. (Grass Valley, CA); Brooks, James E. (Manvel, TX); Aseltine, Clifford L. (late of Houston, TX)

2002-01-01T23:59:59.000Z

34

Load diagram for a perforated plate tray  

E-Print Network (OSTI)

1 decimals noggrannhet c. Upprita i x,y-diagrammet q-linjen och bestäm (grafiskt, eller med must be produced. The feed stream F is a saturated liquid, i.e. q = 1, while the reflux ratio R = 1Load diagram for a perforated plate tray vG, vL: velocities G, L: densities QL, QG: volume flows H

Zevenhoven, Ron

35

equality constraints, riemannian manifolds and direct search methods  

E-Print Network (OSTI)

Aug 2, 2007 ... EQUALITY CONSTRAINTS, RIEMANNIAN MANIFOLDS AND DIRECT SEARCH METHODS. David W. Dreisigmeyer(dreisigm ***at*** lanl.gov).

36

Three?dimensional group manifold reductions of gravity  

Science Conference Proceedings (OSTI)

We review the three?dimensional group manifold reductions of pure Einstein gravity and we exhibit a new consistent group manifold reduction of gravity when the compactification group manifold is S 3. The new reduction leads to a lower dimensional theory whose gauge group is SU (2).

Román Linares

2005-01-01T23:59:59.000Z

37

Manifold gasket accommodating differential movement of fuel cell stack  

DOE Patents (OSTI)

A gasket for use in a fuel cell system having at least one externally manifolded fuel cell stack, for sealing the manifold edge and the stack face. In accordance with the present invention, the gasket accommodates differential movement between the stack and manifold by promoting slippage at interfaces between the gasket and the dielectric and between the gasket and the stack face.

Kelley, Dana A. (New Milford, CT); Farooque, Mohammad (Danbury, CT)

2007-11-13T23:59:59.000Z

38

S-Parabolic manifolds A. Aytuna and A. Sadullaev  

E-Print Network (OSTI)

S-Parabolic manifolds A. Aytuna and A. Sadullaev Abstract. A Stein manifold is called S parabolic. If a continuous special plurisubharmonic exits then we will call the manifold S parabolic: In one dimensional case of dimension n is called S parabolic in case there exits a special plurisubharmonic function 2 PSH (X

Yanikoglu, Berrin

39

Tubing-conveyed perforating cuts costs, boosts production  

Science Conference Proceedings (OSTI)

A new Attaka Field development program was started in November 1984 with the objective of reversing the field's declining production. The Intermediate and Deep sands were the reservoirs of interest since their abundance and large areal extent account for a large volume of oil and gas. Many factors contributed to the success of this program, particularly tubing conveyed perforating, (TCP) which has reduced completion time, formation damage and maximized well production. This article discusses the determination of proper underbalance, operational aspects of tubing conveyed perforating, cost comparisons between TCP and wireline methods and a comparison of skin factors resulting from underbalanced perforating and overbalanced perforating.

Sukmadjaja, T.; Shewchenko, D.; Ajam, S.O.

1988-05-01T23:59:59.000Z

40

Recent advances in understanding perforator penetration and flow performance  

Science Conference Proceedings (OSTI)

Driven by the importance of perforation performance in both natural and stimulated completions, understanding of the factors that control penetration depth and formation damage has improved significantly over the last 10 years. Improved test procedures and their tabulated results are now available to predict downhole penetration as a function of rock properties and overburden stress. Progress has also been made in understanding the nature of permeability damage around perforations and how to prevent, remove, or bypass it. In particular, the mechanisms behind underbalanced perforating are being clarified, leading to better engineering of perforating procedures and better prediction of their results.

Halleck, P.M. [Pennsylvania State Univ., University Park, PA (United States)

1997-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Underbalanced perforation characteristics as affected by differential pressure  

Science Conference Proceedings (OSTI)

Underbalanced, tubing-conveyed completions are increasing because of the apparent advantages of cleaner perforations, reduced completion times, and stimulation treatments. Radial-flow Berea sandstone core specimens are used to determine the perforation characteristics resulting from time-dependent pressure differentials between core pressure and wellbore pressure during the completion process. The primary perforation characteristic studied (radial flow ratio (RFR)) is defined as the ratio of the perforated flow rate to the flow rate of the unperforated core. The perforation flow tests included pressure differentials from 500 psi (3450 kPa) overbalanced to 1,000 psi (6900 kPa) underbalanced, with immediate or delayed surging. The RFR was affected most by the 500-psi and 1,000-psi (3450- and 6900-kPa) underbalance. The surged RFR's were from 50 to 58% greater than the no-surge RFR's. Perforation hole volumes were increased as much as 55% by the surge, indicating some elimination of the compacted, damaged-zone material. Underbalanced surge conditions (1,000 psi (6900 kPa)) increased hole volume to four times that resulting from 500 psi (3450 kPa) overbalanced, no-surge conditions. Underbalanced surging, either at the instant of perforation or subsequently, appears to improve the flow characteristics of shaped-charge perforations by simultaneously reducing the thickness of the low-permeability crushed zone and increasing the perforation surface area.

Regalbuto, J.A.; Riggs, R.S.

1988-02-01T23:59:59.000Z

42

ROCK PERFORATION BY PULSED ND:YAG LASER  

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

of Petroleum Engineering, Colorado School of Mines 3 Parker Geosciences, LLC Abstract In gas and oil well completion, perforation channels must be made through the steel casing...

43

On Paraquaternionic Submersions Between Paraquaternionic Kähler Manifolds  

Science Conference Proceedings (OSTI)

In this paper we deal with some properties of a class of semi-Riemannian submersions between manifolds endowed with paraquaternionic structures, proving a result of non-existence of paraquaternionic submersions between paraquaternionic Kähler non-locally ... Keywords: 53C15, 53C26, 53C50, Locally hyper para-Kähler structures, Paraquaternionic Kähler structures, Paraquaternionic submersions, Sasaki metric, Semi-Riemannian submersions

Angelo V. Caldarella

2010-10-01T23:59:59.000Z

44

A combined perforating and well testing system  

Science Conference Proceedings (OSTI)

Underbalanced perforating is widely used in well completions and is considered by many operators to be an effective method of obtaining improved well productivity. A measurement of downhole pressure before, during and after perforating can be made by installing a pressure gauge on the gun-string. By using a wireline, the added capability of real-time read-out on surface allows the entire operation to be monitored 'live.' Correct underbalance can be accurately established prior to shooting, there is an unambiguous shot indication, and a pressure transient analysis can be made during the initial flow or fill-up period. From this we can obtain an estimate of permeability, skin damage and, possibly, static reservoir pressure, which is a useful supplement to the shut-in buildup analysis which usually follows if flow reaches surface. Any subsequent conventional well-test can of course be planned without the need to retrieve or run in additional equipment since the pressure gauge is already in place.

Westaway, P.J.; El Shafie, I.; Wittman, M.J.

1985-01-01T23:59:59.000Z

45

Evaluation of the Relative Importance of Parameters Influencing Perforation Cleanup  

Science Conference Proceedings (OSTI)

Completion of cased and cemented wells by shaped-charge perforation results in damage to the formation, which can significantly reduce well productivity. Typically, underbalanced conditions are imposed during perforation in an effort to remove damaged rock and shaped-charge debris from the perforation tunnel. Immediately after the shaped-charge jet penetrates the formation, there is a transient surge of fluid from the formation through the perforation and into the well bore. Experimental evidence suggests that it is this transient pressure surge that leads to the removal of damaged rock and charge debris leaving an open perforation tunnel. We have developed a two-stage computational model to simulate the perforation process and subsequent pressure surge and debris removal. The first stage of the model couples a hydrocode with a model of stress-induced permeability evolution to calculate damage to the formation and the resulting permeability field. The second stage simulates the non-Darcy, transient fluid flow from the formation and removes damaged rock and charge debris from the perforation tunnel. We compare the model to a series of API RP43 section 4 flow tests and explore the influence of fluid viscosity and rock strength on the final perforation geometry and permeability.

Detwiler, R L; Morris, J P; Karacan, C O; Halleck, P M; Hardesty, J

2003-10-22T23:59:59.000Z

46

Reinforced concrete perforation and penetration simulation using AUTODYN-3D  

Science Conference Proceedings (OSTI)

3D hydrocode simulation on the perforation and penetration of reinforced concrete target has been performed. The simulation aims to examine the influence of the following constitutive models for concrete on a projectile's residual velocity: (1) constant-yield ... Keywords: Constitutive model, Hydrocode, Perforation, Projectile, Reinforced concrete

C. Y. Tham

2005-08-01T23:59:59.000Z

47

Engine Air Intake Manifold Having Built In Intercooler  

DOE Patents (OSTI)

A turbocharged V type engine can be equipped with an exhaust gas recirculation cooler integrated into the intake manifold, so as to achieve efficiency, cost reductions and space economization improvements. The cooler can take the form of a tube-shell heat exchanger that utilizes a cylindrical chamber in the air intake manifold as the heat exchanger housing. The intake manifold depends into the central space formed by the two banks of cylinders on the V type engine, such that the central space is effectively utilized for containing the manifold and cooler.

Freese, V, Charles E. (Westland, MI)

2000-09-12T23:59:59.000Z

48

Remark on the Serre-Swan theorem for graded manifolds  

E-Print Network (OSTI)

Combining the Batchelor theorem and the Serre-Swan theorem, we come to that, given a smooth manifold $X$, a graded commutative $C^\\infty(X)$-algebra $\\cA$ is isomorphic to the structure ring of a graded manifold with a body $X$ iff it is the exterior algebra of some projective $C^\\infty(X)$-module of finite rank. In particular, it follows that odd fields in field theory on a smooth manifold $X$ can be represented by graded functions on some graded manifold with body $X$.

G. Sardanashvily

2013-04-04T23:59:59.000Z

49

Fuel rod assembly to manifold attachment  

DOE Patents (OSTI)

A fuel element is formed with a plurality of fuel rod assemblies detachably connected to an overhead support with each of the fuel rod assemblies having a gas tight seal with the support to allow internal fission gaseous products to flow without leakage from the fuel rod assemblies into a vent manifold passageway system on the support. The upper ends of the fuel rod assemblies are located at vertically extending openings in the support and upper threaded members are threaded to the fuel rod assemblies to connect the latter to the support. The preferred threaded members are cap nuts having a dome wall encircling an upper threaded end on the fuel rod assembly and having an upper sealing surface for sealing contact with the support. Another and lower seal is achieved by abutting a sealing surface on each fuel rod assembly with the support. A deformable portion on the cap nut locks the latter against inadvertent turning off the fuel rod assembly. Orienting means on the fuel rod and support primarily locates the fuel rods azimuthally for reception of a deforming tool for the cap nut. A cross port in the fuel rod end plug discharges into a sealed annulus within the support, which serves as a circumferential chamber, connecting the manifold gas passageways in the support.

Donck, Harry A. (San Diego, CA); Veca, Anthony R. (San Diego, CA); Snyder, Jr., Harold J. (San Diego, CA)

1980-01-01T23:59:59.000Z

50

A construction of a nonparametric quantum information manifold  

E-Print Network (OSTI)

We present a construction of a Banach manifold on the set of faithful normal states of a von Neumann algebra, where the underlying Banach space is a quantum analogue of an Orlicz space. On the manifold, we introduce the exponential and mixture connections as dual pair of affine connections.

Anna Jencova

2005-11-21T23:59:59.000Z

51

Constructive Methods of Invariant Manifolds for Kinetic Problems  

E-Print Network (OSTI)

We present the Constructive Methods of Invariant Manifolds for model reduction in physical and chemical kinetics, developed during last two decades. The problem of reduced description is studied as a problem of constructing the slow invariant manifold. The invariance conditions are formulated as the differential equation for a manifold immersed in the phase space (the invariance equation). The equation of motion for immersed manifolds is obtained (the film extension of the dynamics). Invariant manifolds are fixed points for this equation, and slow invariant manifolds are Lyapunov stable fixed points, thus slowness is presented as stability. A collection of methods for construction of slow invariant manifolds is presented, in particular the analogue of KAM methods for dissipative systems. We systematically consider a discrete analogue of the slow (stable) positively invariant manifolds for dissipative systems, invariant grids. The following examples of applications are presented: Nonperturbative deviation of physically consistent hydrodynamics from the Boltzmann equation and from the reversible dynamics, for Knudsen numbers ~ 1; construction of the moment equations for nonequilibrium media and their dynamical correction (instead of extension of list of variables) to gain more accuracy in description of highly nonequilibrium flows; invariant grids for chemical reactions; universal continuous media description of dilute polymeric solution, etc.

A. N. Gorban; I. V. Karlin; A. Yu. Zinovyev

2003-11-02T23:59:59.000Z

52

Compact Einstein-Weyl Manifolds With Large Symmetry Group  

E-Print Network (OSTI)

A geometric classification of the compact four-dimensional Einstein-Weyl manifolds with at least four-dimensional symmetry group is given. Our results also sharpen previous results on four-dimensional Einstein metrics and correct Parker's topological classification of cohomogeneity-one four-manifolds.

Anders Bisbjerg Madsen; Henrik Pedersen; Yat Sun Poon; Andrew Swann

1995-01-01T23:59:59.000Z

53

Manifold to uniformly distribute a solid-liquid slurry  

DOE Patents (OSTI)

This invention features a manifold that divides a stream of coal particles and liquid into several smaller streams maintaining equal or nearly equal mass compositions. The manifold consists of a horizontal, variable area header having sharp-edged, right-angled take-offs which are oriented on the bottom of the header.

Kern, Kenneth C. (Lake Hiawatha, NJ)

1983-01-01T23:59:59.000Z

54

Modeling complex heterogeneous objects with non-manifold heterogeneous cells  

Science Conference Proceedings (OSTI)

This paper presents a new approach to model complex heterogeneous objects with simultaneous geometry intricacies as well as complex material distributions. Different from most of the existing approaches, which utilize manifold B-Rep and the assembly ... Keywords: Attribute based reasoning, Boolean operation, Cellular model, Heterogeneous material, Non-manifold

X. Y. Kou; S. T. Tan; W. S. Sze

2006-05-01T23:59:59.000Z

55

Natural completions - overcoming the damage caused by drilling and perforations  

SciTech Connect

Natural completions are suggested as a way to avoid or overcome damage to the formation caused by drilling and perforating. Formation damage may take the form of plugged passageways which remain closed because formation pressure does not exceed that of the plug material. Natural completions refer to using maximum differential pressure toward the wellbore, so that such obstructions in passageways can less easily exist. The method allows the formation pressure to backsurge perforation tunnels immediately following detonation of the guns, with the objectives of obtaining deep, clean perforations with the crushed zone and debris completely removed from the perforations. Procedures for natural completions are described and illustrated. A case history is given where the natural completion method restores productivity of a well.

Perry, G.; Smith, G.

1980-04-01T23:59:59.000Z

56

Dual manifold system and method for fluid transfer  

DOE Patents (OSTI)

A dual-manifold assembly is provided for the rapid, parallel transfer of liquid reagents from a microtiter plate to a solid state microelectronic device having biological sensors integrated thereon. The assembly includes aspiration and dispense manifolds connected by a plurality of conduits. In operation, the aspiration manifold is actuated such that the aspiration manifold is seated onto an array of reagent-filled wells of the microtiter plate. The wells are pressurized to force reagent through conduits toward the dispense manifold. A pressure pulse provided by a standard ink-jet printhead ejects nanoliter-to-picoliter droplets of reagent through an array of printhead orifices and onto test sites on the surface of the microelectronic device.

Doktycz, Mitchel J. (Knoxville, TN); Bryan, William Louis (Knoxville, TN); Kress, Reid (Oak Ridge, TN)

2003-05-27T23:59:59.000Z

57

Analyses and applications of pressure, flowrate, and temperature measurements during a perforating run  

Science Conference Proceedings (OSTI)

Perforating technology has undergone significant advances during the last decade. Tubing conveyed perforating (TCP), underbalanced perforating, high shot density guns, better shaped charges, and improved gun systems are some of the developments that have contributed to safer operations and improved productivity of the perforated completions. A recent development, described in this paper, is a perforating tool that makes real-time downhole measurements during a perforating run and has the capability of selectively firing a number of guns at different depths or times. These measurements include pressure, flow rate, temperature, GR, CCL, and cable tension. The simultaneous downhole measurements, in addition to providing better control of the perforating process, can in a single trip provide a production log, conventional well tests before and after perforating, and a fill-up or slug test soon after perforating for underbalanced conditions.

Tariq, S.M.; Ayestaran, L.

1986-01-01T23:59:59.000Z

58

An implicit trust-region method on Riemannian manifolds§  

E-Print Network (OSTI)

Jun 6, 2007 ... described in terms of optimizing a smooth function on a manifold (e.g., the eigen- .... Use CG recurrences to update residual and search direction. 21: Set rj+1 = rj +

59

On Hamiltonian Balanced Dynamics and the Slowest Invariant Manifold  

Science Conference Proceedings (OSTI)

The concept of a slowest invariant manifold is investigated for the five-component model of Lorenz under conservative dynamics. It is shown that Lorenz's model is a two-degree-of-freedom canonical Hamiltonian system, consisting of a nonlinear ...

Onno Bokhove; Theodore G. Shepherd

1996-01-01T23:59:59.000Z

60

Deformations and gluing of asymptotically cylindrical manifolds with exceptional holonomy  

E-Print Network (OSTI)

for financial support. I thank also my family and friends for being there. Contents 1 Introduction 1 2 Background material 7 2.1 Preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1.1 Riemannian holonomy... with than arbitrary non-compact manifolds, e.g. many analysis 2 results for elliptic operators on compact manifolds can be generalised to statements about asymptotically translation-invariant elliptic operators acting on suitable spaces of sections...

Nordström, Johannes

2008-10-14T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Procedural design considerations associated with tubing-conveyed underbalanced perforating  

Science Conference Proceedings (OSTI)

Thirty-two tubing conveyed underbalanced perforating jobs conducted in the Gulf of Mexico between May, 1980, and May, 1982, have been carefully reviewed in order to draw correlations between procedural variations and trouble prone jobs. General procedural guidelines designed to avoid past problems were formulated and are presented. The procedures are designed for the generalized case where the perforating guns will be pulled out of the well in order to gravel pack and not for those run as part of a permanent completion. Careful application of these procedural guidelines has resulted in reducing rig time requirements by an average of 35% on 33 additional tubing conveyed underbalanced perforating jobs conducted subsequent to the establishment of the guidelines contained in this paper.

Young, W.S.; Zaleski, T.E.

1985-03-01T23:59:59.000Z

62

Analysis of pressure-transient data from underbalanced perforating  

Science Conference Proceedings (OSTI)

Determination of reservoir characteristics from transient pressures created by underbalanced perforating can enable an operator to decide whether a well is commercially productive before permanent completion. Several techniques exist to analyze such data. In this paper, closed-chamber testing and log-log- and Cartesian-plotted short producing times are used to analyze data collected from a multiwell project in the Gulf of Mexico. Pressure data were obtained from underbalanced perforating and backsurge-washing treatments. Results of these analyses compared favorably with buildup tests performed after the wells were completed.

Centanni, R.J.; Chacon, E.A.; Ruiz, S.J. (Halliburton Reservoir Services (US)); Garrett, J.C.; Shealy, R.A. (Freeport-McMoran Oil and Gas Co. (US))

1991-09-01T23:59:59.000Z

63

Seed Dispersal  

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

Seed Dispersal Seed Dispersal Nature Bulletin No. 35 October 6, 1945 Forest Preserve District of Cook County Clayton F, Smith, President Roberts Mann, Superintendent of Conservation SEED DISPERSAL Plants have various ways of spreading their seeds. Some have "fly-away" seeds. Included are the dandelion, thistle, tumbleweed, cattail, clematis, and many trees. The cottonwood, sycamore, aspen, linden, ailanthus, maple, box elder, birch and the pines are all trees having seeds with wings or with "down", that are carried by winds. Certain aquatic plants have seeds that sink to bury themselves in.the mud beneath the water. Others have seeds that float and are distributed by the winds and currents that carry them away. Many plants "shoot" their seeds, the seed pods popping open with sufficient force to throw the seeds many feet away, Notable in this group are knotgrass, lady slippers, violets, vetches, jewel weed, witch- hazel, and Heavea, the Para rubber tree, The witch-hazel may shoot its seeds 30 or 40 feet.

64

Electricity Price Curve Modeling and Forecasting by Manifold Learning  

E-Print Network (OSTI)

This paper proposes a novel nonparametric approach for the modeling and analysis of electricity price curves by applying the manifold learning methodology—locally linear embedding (LLE). The prediction method based on manifold learning and reconstruction is employed to make short-term and mediumterm price forecasts. Our method not only performs accurately in forecasting one-day-ahead prices, but also has a great advantage in predicting one-week-ahead and one-month-ahead prices over other methods. The forecast accuracy is demonstrated by numerical results using historical price data taken from the Eastern U.S. electric power markets.

Jie Chen; Shi-Jie Deng; Xiaoming Huo

2008-01-01T23:59:59.000Z

65

Information Geometry and Chaos on Negatively Curved Statistical Manifolds  

E-Print Network (OSTI)

A novel information-geometric approach to chaotic dynamics on curved statistical manifolds based on Entropic Dynamics (ED) is suggested. Furthermore, an information-geometric analogue of the Zurek-Paz quantum chaos criterion is proposed. It is shown that the hyperbolicity of a non-maximally symmetric 6N-dimensional statistical manifold M_{s} underlying an ED Gaussian model describing an arbitrary system of 3N non-interacting degrees of freedom leads to linear information-geometric entropy growth and to exponential divergence of the Jacobi vector field intensity, quantum and classical features of chaos respectively.

Carlo Cafaro

2008-10-25T23:59:59.000Z

66

Application of High Powered Lasers to Perforated Completions  

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

Congress on Applications of Laser & Electro-Optics Congress on Applications of Laser & Electro-Optics October 13 - 16, 2003, Jacksonville, Florida Application of High Powered Lasers to Perforated Completions Zhiyue Xu, Claude B. Reed and Keng H. Leong Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 R. A. Parker Parker Geoscience Consulting, LLC, 6346 Secrest Street, Arvada, CO 80403 R. M. Graves, Petroleum Engineering Department, Colorado School of Mines, Golden, CO 80401 ABSTRACT As part of the process of drilling an oil or gas well, a steel production casing is often inserted to the bottom of the well and sealed with cement against the productive formation. Openings must be made through the steel casing wall and cement and into the rock formation to allow formation fluid to enter the well. Conventionally, a perforator is

67

Steam-injection profile control using limited-entry perforations  

SciTech Connect

A completion technique for steam-injection wells that ensures improved profile distribution of steam into several independent sands is being used at the South Belridge field in California. Previously, steam profiles were poor for many of the conventionally perforated (two 3/8-in. (9.5-mm) -diameter holes per foot) injection wells. This standard completion does not guarantee that the thicker, higher-permeability sands will not act as thief zones with respect to the thinner, tighter sands open in the same wellbore. Limited-entry perforating (typically one hole per 15 to 20 ft (4.6 to 6.1m) of gross interval with at least one in each major sand member) provides the best assurance of achieving a uniform injection profile in single-wellbore multisand completions.

Small, G.P.

1986-09-01T23:59:59.000Z

68

Steam-injection profile control using limited-entry perforations  

Science Conference Proceedings (OSTI)

A completion technique for steam injection wells that assures improved profile distribution of steam into several independent sands is being used at the South Belridge Field, California. Previously, steam profiles were poor for many of the conventionally perforated (two-3/8'' diameter holes per foot) injection wells. This standard completion does not guarantee that the thicker, higher permeability sands will not act as thief zones with respect to the thinner, tighter sands open in the same wellbore. Limited entry perforating (typically one hole per 15-20' of gross interval with at least one in each major sand member) provides the best assurance of achieving a uniform injection profile in single wellbore multi-sand completions.

Small, G.P.

1985-03-01T23:59:59.000Z

69

Apparatus and method for sealing perforated well casing  

DOE Patents (OSTI)

Perforations and other openings in well casings, liners and other conduits may be substantially blocked or sealed to prevent fluid flow between the casing or liner interior and an earth formation by placing a radially expansible sleeve adjacent the perforations or openings and urging the sleeve into forcible engagement with the casing or inner wall using an explosive charge. An apparatus including a radially contracted sleeve formed by a coiled plate member or a tubular member having flutes defined by external and internal folds, may be deployed into a well casing or liner through a production or injection tubing string and on the end of a flexible cable or coilable tubing. An explosive charge disposed on the apparatus and within the sleeve may be detonated to urge the sleeve into forcible engagement with the casing inner wall. 17 figs.

Blount, C.G.; Benham, R.A.; Brock, J.L.; Emerson, J.A.; Ferguson, K.R.; Scheve, D.F.; Schmidt, J.H.; Schuler, K.W.; Stanton, P.L.

1997-03-25T23:59:59.000Z

70

Apparatus and method for sealing perforated well casing  

DOE Patents (OSTI)

Perforations and other openings in well casings, liners and other conduits may be substantially blocked or sealed to prevent fluid flow between the casing or liner interior and an earth formation by placing a radially expansible sleeve adjacent the perforations or openings and urging the sleeve into forcible engagement with the casing or inner wall using an explosive charge. An apparatus including a radially contracted sleeve formed by a coiled plate member or a tubular member having flutes defined by external and internal folds, may be deployed into a well casing or liner through a production or injection tubing string and on the end of a flexible cable or coilable tubing. An explosive charge disposed on the apparatus and within the sleeve may be detonated to urge the sleeve into forcible engagement with the casing inner wall.

Blount, Curtis G. (Wasilla, AK); Benham, Robert A. (Albuquerque, NM); Brock, Jerry L. (Los Lunas, NM); Emerson, John A. (Albuquerque, NM); Ferguson, Keith R. (Anchorage, AK); Scheve, Donald F. (Anchorage, AK); Schmidt, Joseph H. (Anchorage, AK); Schuler, Karl W. (Albuquerque, NM); Stanton, Philip L. (Albuquerque, NM)

1997-01-01T23:59:59.000Z

71

Perforated plates for cryogenic regenerators and method of fabrication  

DOE Patents (OSTI)

Perforated plates having very small holes with a uniform diameter throughout the plate thickness are prepared by a [open quotes]wire drawing[close quotes] process in which a billet of sacrificial metal is disposed in an extrusion can of the plate metal, and the can is extruded and restacked repeatedly, converting the billet to a wire of the desired hole diameter. At final size, the rod is then sliced into wafers, and the wires are removed by selective etching. This process is useful for plate metals of interest for high performance regenerator applications, in particular, copper, niobium, molybdenum, erbium, and other rare earth metals. Er[sub 3]Ni, which has uniquely favorable thermophysical properties for such applications, may be incorporated in regions of the plates by providing extrusion cans containing erbium and nickel metals in a stacked array with extrusion cans of the plate metal, which may be copper. The array is heated to convert the erbium and nickel metals to Er[sub 3]Ni. Perforated plates having two sizes of perforations, one of which is small enough for storage of helium, are also disclosed. 10 figures.

Hendricks, J.B.

1994-03-29T23:59:59.000Z

72

Nonlinear manifold learning for dynamic shape and dynamic appearance  

Science Conference Proceedings (OSTI)

Our objective is to learn representations for the shape and the appearance of moving (dynamic) objects that support tasks such as synthesis, pose recovery, reconstruction, and tracking. In this paper, we introduce a framework that aims to learn landmark-free ... Keywords: Appearance-based vision, Gait analysis, Human motion analysis, Manifold learning, Motion analysis, Shape analysis

Ahmed Elgammal; Chan-Su Lee

2007-04-01T23:59:59.000Z

73

Cutting and Stitching: Converting Sets of Polygons to Manifold Surfaces  

Science Conference Proceedings (OSTI)

Abstract¿Many real-world polygonal surfaces contain topological singularities that represent a challenge for processes such as simplification, compression, and smoothing. We present an algorithm that removes singularities from nonmanifold sets of polygons ... Keywords: Polygonal surface, topological singularities, manifold, cutting, stitching.

André Guéziec; Gabriel Taubin; Francis Lazarus; Bill Horn

2001-04-01T23:59:59.000Z

74

Mass-capacity inequalities for conformally flat manifolds with boundary  

E-Print Network (OSTI)

In this paper we prove a mass-capacity inequality and a volumetric Penrose inequality for conformally flat manifolds, in arbitrary dimensions. As a by-product of the proofs, capacity and Aleksandrov-Fenchel inequalities for mean-convex Euclidean domains are obtained. For each inequality, the case of equality is characterized.

Alexandre Freire; Fernando Schwartz

2011-07-07T23:59:59.000Z

75

Fuel cell stack with internal manifolds for reactant gases  

DOE Patents (OSTI)

A fuel cell stack includes a plurality of plate-like fuel cells arranged along an axis generally parallel to cell thickness with electrically conductive separator plates between each pair of cells. A plurality of axial manifolds are provided at opposite sides of the stack in outer marginal portions beyond the edges of electrodes and electrolyte tiles. Sealing rings prevent cross-leakage of oxidant fuel gases through use of pairs of outwardly extending lips from opposite tile surfaces bonded to first and second electrode frames respectively. The frames provide transition between electrode edges and manifold perimeters. The pairs of extension lips are sealingly bonded together through an electrically insulative sealing ring with wedge shaped fastening members.

Schnacke, A.W.

1983-10-12T23:59:59.000Z

76

Fuel cell stack with internal manifolds for reactant gases  

DOE Patents (OSTI)

A fuel cell stack includes a plurality of plate-like fuel cells arranged along an axis generally parallel to cell thickness with electrically conductive separator plates between each pair of cells. A plurality of axial manifolds are provided at opposite sides of the stack in outer marginal portions beyond the edges of electrodes and electrolyte tiles. Sealing rings prevent cross-leakage of oxidant fuel gases through use of pairs of outwardly extending lips from opposite tile surfaces bonded to first and second electrode frames respectively. The frames provide transition between electrode edges and manifold perimeters. The pairs of extension lips are sealingly bonded together through an electrically insulative sealing ring with wedge shaped fastening members.

Schnacke, Arthur W. (Schenectady, NY)

1985-01-01T23:59:59.000Z

77

Chern-Simons Theory on Seifert 3-Manifolds  

E-Print Network (OSTI)

We study Chern-Simons theory on 3-manifolds M that are circle-bundles over 2-dimensional orbifolds S by the method of Abelianisation. This method, which completely sidesteps the issue of having to integrate over the moduli space of non-Abelian flat connections, reduces the complete partition function of the non-Abelian theory on M to a 2-dimensional Abelian theory on the orbifold S which is easily evaluated.

Matthias Blau; George Thompson

2013-06-14T23:59:59.000Z

78

Renormalized Resonance Quartets in Dispersive Wave Turbulence  

Science Conference Proceedings (OSTI)

Using the (1+1)D Majda-McLaughlin-Tabak model as an example, we present an extension of the wave turbulence (WT) theory to systems with strong nonlinearities. We demonstrate that nonlinear wave interactions renormalize the dynamics, leading to (i) a possible destruction of scaling structures in the bare wave systems and a drastic deformation of the resonant manifold even at weak nonlinearities, and (ii) creation of nonlinear resonance quartets in wave systems for which there would be no resonances as predicted by the linear dispersion relation. Finally, we derive an effective WT kinetic equation and show that our prediction of the renormalized Rayleigh-Jeans distribution is in excellent agreement with the simulation of the full wave system in equilibrium.

Lee, Wonjung [Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, New York 10012 (United States); Kovacic, Gregor [Mathematical Sciences Department, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180 (United States); Cai, David [Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, New York 10012 (United States); Mathematics Department, Shanghai Jiao Tong University, Shanghai 200240 (China)

2009-07-10T23:59:59.000Z

79

Results of stress-oriented and aligned perforating in fracturing deviated wells  

SciTech Connect

This paper reports the first results of stress-oriented and aligned perforation of deviated wells at the Kuparuk River field, Alaska. Preferred perforation alignment and spacing are calculated for each well so the fractures from individual perforations link to produce a single zipper fracture plane along the deviated wellbore. Results of the first application of this technique are presented from the 26-well development of Drillsite 2K. The results from use of three different oriented-casing-gun systems and pertinent data from Drillsite 2K fracture stimulation treatments are discussed. Comparisons to drillsite where nonaligned perforating strategies were used show a significant reduction in perforation friction, enabling the placement of large, more productive fracture treatments. Application of this technique to deviated and vertical wells and its use at Kuparuk on developments after Drillsite 2K are discussed.

Pearson, C.M.; Bond, A.J.; Eck, M.E.; Schmidt, J.H. (Arco Alaska Inc. (US))

1992-01-01T23:59:59.000Z

80

General reference frames and their associated space manifolds  

E-Print Network (OSTI)

We propose a formal definition of a general reference frame in a general spacetime, as an equivalence class of charts. This formal definition corresponds with the notion of a reference frame as being a (fictitious) deformable body, but we assume, moreover, that the time coordinate is fixed. This is necessary for quantum mechanics, because the Hamiltonian operator depends on the choice of the time coordinate. Our definition allows us to associate rigorously with each reference frame F, a unique "space" (a three-dimensional differentiable manifold), which is the set of the world lines bound to F. This also is very useful for quantum mechanics.

Arminjon, Mayeul

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Euclidean SYM Theories by Time Reduction and Special Holonomy Manifolds  

E-Print Network (OSTI)

Euclidean supersymmetric theories are obtained from Minkowskian theories by performing a reduction in the time direction. This procedure elucidates certain mysterious features of Zumino's N=2 model in four dimensions, provides manifestly hermitian Euclidean counterparts of all non-mimimal SYM theories, and is also applicable to supergravity theories. We reanalyse the twists of the 4d N=2 and N=4 models from this point of view. Other applications include SYM theories on special holonomy manifolds. In particular, we construct a twisted SYM theory on Kaehler 3-folds and clarify the structure of SYM theory on hyper-Kaehler 4-folds.

Matthias Blau; George Thompson

1997-06-30T23:59:59.000Z

82

Convexity package for momentum maps on contact manifolds  

E-Print Network (OSTI)

Let a torus T act effectively on a compact connected cooriented contact manifold, and let Psi be the natural momentum map on the symplectization. We prove that, if dim T > 2, the union of the origin with the image of Psi is a convex polyhedral cone, the non-zero level sets of Psi are connected (while the zero level set can be disconnected), and the momentum map is open as a map to its image. This answers a question posed by Eugene Lerman, who proved similar results when the zero level set is empty. We also analyze examples with dim T <= 2.

Chiang, River

2009-01-01T23:59:59.000Z

83

NUMERICAL MODELING AND OPTIMIZATION OF SINGLE PHASE MANIFOLD-MICROCHANNEL PLATE HEAT EXCHANGER.  

E-Print Network (OSTI)

??In recent years manifold-microchannel technology has received considerable attention from the research community as it has demonstrated clear advantage over state of the art heat… (more)

Arie, Martinus Adrian

2012-01-01T23:59:59.000Z

84

Mechanical seal having a single-piece, perforated mating ring  

DOE Patents (OSTI)

A mechanical seal (e.g., single mechanical seals, double mechanical seals, tandem mechanical seals, bellows, pusher mechanical seals, and all types of rotating and reciprocating machines) with reduced contact surface temperature, reduced contact surface wear, or increased life span. The mechanical seal comprises a rotating ring and a single-piece, perforated mating ring, which improves heat transfer by controllably channeling coolant flow through the single-piece mating ring such that the coolant is in substantially uniform thermal contact with a substantial portion of the interior surface area of the seal face, while maintaining the structural integrity of the mechanical seal and minimizing the potential for coolant flow interruptions to the seal face caused by debris or contaminants (e.g., small solids and trash) in the coolant.

Khonsari, Michael M. (Baton Rouge, LA); Somanchi, Anoop K. (Fremont, CA)

2007-08-07T23:59:59.000Z

85

Sodar in Dispersion Modeling  

Science Conference Proceedings (OSTI)

Usefulness of sodar data for dispersion modeling has been highlighted. A case study of using sodar data in a simple Gaussian dispersion model to calculate ground-level concentration of particulate matter emitted from a cement plant has been ...

B. S. Gera; D. R. Pahwa; Neeraj Saxena; Gurbir Singh; Rakesh Aggarwal

1996-10-01T23:59:59.000Z

86

Black Strings, Black Rings and State-space Manifold  

E-Print Network (OSTI)

State-space geometry is considered, for diverse three and four parameter non-spherical horizon rotating black brane configurations, in string theory and $M$-theory. We have explicitly examined the case of unit Kaluza-Klein momentum $D_1D_5P$ black strings, circular strings, small black rings and black supertubes. An investigation of the state-space pair correlation functions shows that there exist two classes of brane statistical configurations, {\\it viz.}, the first category divulges a degenerate intrinsic equilibrium basis, while the second yields a non-degenerate, curved, intrinsic Riemannian geometry. Specifically, the solutions with finitely many branes expose that the two charged rotating $D_1D_5$ black strings and three charged rotating small black rings consort real degenerate state-space manifolds. Interestingly, arbitrary valued $M_5$-dipole charged rotating circular strings and Maldacena Strominger Witten black rings exhibit non-degenerate, positively curved, comprehensively regular state-space configurations. Furthermore, the state-space geometry of single bubbled rings admits a well-defined, positive definite, everywhere regular and curved intrinsic Riemannian manifold; except for the two finite values of conserved electric charge. We also discuss the implication and potential significance of this work for the physics of black holes in string theory.

Stefano Bellucci; Bhupendra Nath Tiwari

2010-10-19T23:59:59.000Z

87

Anomalous Near-Field Heat Transfer between a Cylinder and a Perforated Surface  

E-Print Network (OSTI)

We predict that the near-field radiative heat-transfer rate between a cylinder and a perforated surface depends nonmonotonically on their separation. This anomalous behavior, which arises due to evanescent-wave effects, ...

Rodriguez-Wong, Alejandro

88

Numerical simulations of perforated plate stabilized premixed flames with detailed chemistry  

E-Print Network (OSTI)

The objective of this work is to develop a high efficiency two-dimensional reactive flow solver to investigate perforated-plate stabilized laminar premixed flames. The developed code is used to examine the impact of the ...

Kedia, Kushal Sharad

2010-01-01T23:59:59.000Z

89

Numerical simulations of perforated plate stabilized premixed flames with detailed chemistry.  

E-Print Network (OSTI)

??The objective of this work is to develop a high efficiency two-dimensional reactive flow solver to investigate perforated-plate stabilized laminar premixed flames. The developed code… (more)

Kedia, Kushal Sharad

2010-01-01T23:59:59.000Z

90

PU(2) monopoles and relations between four-manifold invariants  

E-Print Network (OSTI)

Using quantum field-theoretic arguments, Witten has established a relation between the Donaldson and Seiberg-Witten invariants of smooth four-manifolds. In this survey article, we describe the program to prove this relation using a moduli space of PU(2) = SO(3) monopoles as a cobordism between the Donaldson moduli space of anti-self-dual SO(3) connections and moduli spaces of U(1) monopoles. We provide an overview of some of our transversality and Uhlenbeck compactness results for PU(2) monopoles, along with some of our calculations of Donaldson invariants in terms of Seiberg-Witten invariants. We give a brief outline of issues concerning the gluing theory, focussing on some of the analytical difficulties that are particular to PU(2) monopoles, and its application to the PU(2) monopole program to prove the relation between Donaldson and Seiberg-Witten invariants.

Paul M. N. Feehan; Thomas G. Leness

1997-09-30T23:59:59.000Z

91

Powder dispersion system  

SciTech Connect

A powder dispersion method and apparatus comprising an air eductor and a powder dispensing syringe inserted into a suction connection of the air eductor.

Gorenz, Heather M. (Albuquerque, NM); Brockmann, John E. (Albuquerque, NM); Lucero, Daniel A. (Albuquerque, NM)

2011-09-20T23:59:59.000Z

92

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter is described which is comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide. A method for making this composition of matter is also described. This invention relates to the art of powder metallurgy and, more particularly, it relates to dispersion strengthened metals.

Sheinberg, H.; Meek, T.T.; Blake, R.D.

1990-01-09T23:59:59.000Z

93

Design of a Transpired Air Heating Solar Collector with an Inverted Perforated Absorber and Asymmetric Compound Parabolic Concentrator.  

E-Print Network (OSTI)

?? absorber and an asymmetric compound parabolic concentrator was applied to increase the intensity of solar radiation incident on the perforated absorber. A 2D ray… (more)

Shams, Nasif

2013-01-01T23:59:59.000Z

94

Manifold and method of batch measurement of Hg-196 concentration using a mass spectrometer  

DOE Patents (OSTI)

A sample manifold and method of its use has been developed so that milligram quantities of mercury can be analyzed mass spectroscopically to determine the [sup 196]Hg concentration to less than 0.02 atomic percent. Using natural mercury as a standard, accuracy of [+-]0.002 atomic percent can be obtained. The mass spectrometer preferably used is a commercially available GC/MS manufactured by Hewlett Packard. A novel sample manifold is contained within an oven allowing flow rate control of Hg into the MS. Another part of the manifold connects to an auxiliary pumping system which facilitates rapid clean up of residual Hg in the manifold. Sample cycle time is about 1 hour. 8 figures.

Grossman, M.W.; Evans, R.

1991-11-26T23:59:59.000Z

95

ON THE GENERALIZATION OF AR PROCESSES TO RIEMANNIAN MANIFOLDS Jo~ao Xavier  

E-Print Network (OSTI)

ON THE GENERALIZATION OF AR PROCESSES TO RIEMANNIAN MANIFOLDS Jo~ao Xavier Instituto Superior T York: Academic Press. [7] S. Gallot, D. Hulin, and J. Lafontaine. Riemannian Geometry, 2nd ed. Springer

Instituto de Sistemas e Robotica

96

The relative isoperimetric inequality on a conformally parabolic manifold with boundary  

SciTech Connect

For an arbitrary noncompact n-dimensional Riemannian manifold with a boundary of conformally parabolic type it is proved that there exists a conformal change of metric such that a relative isoperimetric inequality of the same form as in the closed n-dimensional Euclidean half-space holds on the manifold with the new metric. This isoperimetric inequality is asymptotically sharp. Bibliography: 6 titles.

Kesel'man, Vladimir M [Moscow State Industrial University, Moscow (Russian Federation)

2011-07-31T23:59:59.000Z

97

Efficiency of perforated breakwater and associated energy dissipation  

E-Print Network (OSTI)

The flow field behavior in the vicinity of a perforated breakwater and the efficiency of the breakwater under regular waves were studied. To examine the efficiency of the structure thirteen types of regular wave conditions with wave periods T = 1, 1.2, 1.6, 2, 2.5 sec and wave heights Hi = 2, 4, 6, 8, 10 cm in an intermediate water depth of 50 cm were tested. The incoming, reflected and transmitted wave heights were measured using resistance type wave gauges positioned at the required locations. The efficiency of the structure was calculated considering the energy balance for the system. The efficiency of the structure for different wave conditions and with different parameters are shown and compared. Seven types of regular waves with wave periods T = 1, 1.6, 2, 2.5 sec and wave heights Hi = 4, 6, 8, 10 cm in an intermediate water depth of 50 cm were tested for the flow behavior study. In order to study the flow field variation with phase, ten phases were considered per one wave. The Particle Image Velocimetry (PIV) technique was employed to measure the two dimensional instantaneous velocity field distribution and MPIV (Matlab toolbox for PIV) and DaVis (a commercial software) were used to calculate the velocity vectors. By repeating the experiments and taking an average, the mean velocity field, mean vorticity field, mean turbulent intensity and mean turbulent kinetic energy field were calculated for each phase and for each wave condition. The phase average fields for each wave condition for each of the above mentioned parameters were calculated taking the average of ten phases. The phase averaged velocity, vorticity and turbulent kinetic energy fields are presented and compared. The energy dissipation based on both elevation data and the velocity data are presented and compared. It was found that for more than 75% of the tested wave conditions, the energy dissipation was above 69%. Thus the structure is very effective in energy dissipation. Further it was found that for all the tested wave conditions most of the turbulent kinetic energy form near the free surface and near the front wall, where as behind the back wall of the structure the turbulent kinetic energy was very small.

Ariyarathne, Hanchapola Appuhamilage

2007-12-01T23:59:59.000Z

98

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1990-01-01T23:59:59.000Z

99

Dispersion strengthened copper  

SciTech Connect

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1989-01-01T23:59:59.000Z

100

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, H.; Meek, T.T.; Blake, R.D.

1988-12-05T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

On The Capacity of Surfaces in Manifolds with Nonnegative Scalar Curvature  

E-Print Network (OSTI)

Given a surface in an asymptotically flat 3-manifold with nonnegative scalar curvature, we derive an upper bound for the capacity of the surface in terms of the area of the surface and the Willmore functional of the surface. The capacity of a surface is defined to be the energy of the harmonic function which equals 0 on the surface and goes to 1 at infinity. Even in the special case of Euclidean space, this is a new estimate. More generally, equality holds precisely for a spherically symmetric sphere in a spatial Schwarzschild 3-manifold. As applications, we obtain inequalities relating the capacity of the surface to the Hawking mass of the surface and the total mass of the asymptotically flat manifold.

Hubert Bray; Pengzi Miao

2007-07-23T23:59:59.000Z

102

IS-321-312-001 TEP-to-HTEP manifold interface sheet  

SciTech Connect

The Tokamak Exhaust Processing System (TEP) receives hydrogen-like and air-like gas streams from the High Tritium Exhaust Processing (HTEP) manifold. Gases from the torus roughing pump are pumped into the HTEP manifold before entering TEP. This interface sheet describes the TEP-HTEP material stream interface, both the physical elements that make up the interface as well as the gas streams that will flow through the interface. The functions of this interface are to: Provide a physical connection for the transport of hydrogen-like and air-like gases from the HTEP manifold to TEP. Provide seals to prevent the unncessary release of tritium to the surrounding environment. Provide valves that can be actuated to stop or prevent the flow of gas into TEP.

Willms, R Scott [Los Alamos National Laboratory; Carlson, Bryan J [Los Alamos National Laboratory; Coons, James E [Los Alamos National Laboratory; Kubic, William L [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

103

The abstract boundary---a new approach to singularities of manifolds  

E-Print Network (OSTI)

A new scheme is proposed for dealing with the problem of singularities in General Relativity. The proposal is, however, much more general than this. It can be used to deal with manifolds of any dimension which are endowed with nothing more than an affine connection, and requires a family \\calc\\ of curves satisfying a {\\em bounded parameter property} to be specified at the outset. All affinely parametrised geodesics are usually included in this family, but different choices of family \\calc\\ will in general lead to different singularity structures. Our key notion is the {\\em abstract boundary\\/} or {\\em $a$-boundary\\/} of a manifold, which is defined for any manifold \\calm\\ and is independent of both the affine connection and the chosen family \\calc\\ of curves. The $a$-boundary is made up of equivalence classes of boundary points of \\calm\\ in all possible open embeddings. It is shown that for a pseudo-Riemannian manifold $(\\calm,g)$ with a specified family \\calc\\ of curves, the abstract boundary points can then be split up into four main categories---regular, points at infinity, unapproachable points and singularities. Precise definitions are also provided for the notions of a {\\em removable singularity} and a {\\em directional singularity}. The pseudo-Riemannian manifold will be said to be singularity-free if its abstract boundary contains no singularities. The scheme passes a number of tests required of any theory of singularities. For instance, it is shown that all compact manifolds are singularity-free, irrespective of the metric and chosen family \\calc.

Susan M. Scott; Peter Szekeres

1994-05-26T23:59:59.000Z

104

Global Dissipativity and Inertial Manifolds for Diffusive Burgers Equations with Low-Wavenumber Instability  

E-Print Network (OSTI)

Global well-posedness, existence of globally absorbing sets and existence of inertial manifolds is investigated for a class of diffusive Burgers equations. The class includes diffusive Burgers equation with nontrivial forcing, the Burgers-Sivashinsky equation and the Quasi-Stedy equation of cellular flames. The global dissipativity is proven in 2D for periodic boundary conditions. For the proof of the existence of inertial manifolds, the spectral-gap condition, which Burgers-type equations do not satisfy in its original form is circumvented by the Cole-Hopf transform. The procedure is valid in both one and two space dimensions.

Jesenko Vukadinovic

2009-05-09T23:59:59.000Z

105

N=4 Superconformal Algebra and the Entropy of HyperKahler Manifolds  

E-Print Network (OSTI)

We study the elliptic genera of hyperKahler manifolds using the representation theory of N=4 superconformal algebra. We consider the decomposition of the elliptic genera in terms of N=4 irreducible characters, and derive the rate of increase of the multiplicities of half-BPS representations making use of Rademacher expansion. Exponential increase of the multiplicity suggests that we can associate the notion of an entropy to the geometry of hyperKahler manifolds. In the case of symmetric products of K3 surfaces our entropy agrees with the black hole entropy of D5-D1 system.

Tohru Eguchi; Kazuhiro Hikami

2009-09-02T23:59:59.000Z

106

N=1 SUSY AdS4 vacua in IIB SUGRA on group manifolds  

E-Print Network (OSTI)

We study N=1 compactification of IIB supergravity to AdS4. The internal manifold must have SU(2)-structure. By putting some restrictions on the SU(2) torsion classes, we can perform an exhaustive scan of all possible solutions on group manifolds. We show that sourceless solutions don't exist and that the presence of O5 and O7 orientifolds is mandatory. We also find a new solution and relate it by T-duality to a known type IIA solution with O6 planes.

Solard, Gautier

2013-01-01T23:59:59.000Z

107

Use dispersion modeling update  

SciTech Connect

This paper discusses EPA's long-awaited update to the Industrial Source Complex (ISC) dispersion models which provides computer-software to comply with National Ambient Air Quality Standards. Moreover, the ISC2 models's Fortran codes are available from EPA at no cost, in a form compatible with desktop computers. This is a plus for hydrocarbon processing industry (HPI) environmental control professionals. ISC2 will be used for all future regulatory applications where dispersion modeling is required for facilities in simple terrain. Process engineers sometimes use ISC models and are often called upon to assist in developing emissions estimates that the program uses to calculate air quality impacts. The model challenges users because it can represent a variety of configurations for emissions sources. Title III of the Clean Air Act Amendments is an entirely new section dealing with air toxics such as those in the HPI. EPA is required to develop a list of maximum achievable control technologies (MACT) for these compounds.

Freiman, J.P.; Hill, J. (Bechtel Environmental, Inc., Houston, TX (US))

1992-08-01T23:59:59.000Z

108

Disabling Radiological Dispersal Terror  

SciTech Connect

Terror resulting from the use of a radiological dispersal device (RDD) relies upon an individual's lack of knowledge and understanding regarding its significance. Disabling this terror will depend upon realistic reviews of the current conservative radiation protection regulatory standards. It will also depend upon individuals being able to make their own informed decisions merging perceived risks with reality. Preparation in these areas will reduce the effectiveness of the RDD and may even reduce the possibility of its use.

Hart, M

2002-11-08T23:59:59.000Z

109

Thermorheological properties of nanostructured dispersions  

E-Print Network (OSTI)

Nanostructured dispersions, which consist of nanometer-sized particles, tubes, sheets, or droplets that are dispersed in liquids, have exhibited substantially higher thermal conductivities over those of the liquids alone. ...

Gordon, Jeremy B

2007-01-01T23:59:59.000Z

110

The Global Geometry of the Slow Manifold in the Lorenz–Krishnamurthy Model  

Science Conference Proceedings (OSTI)

The five-equation model introduced by Lorenz and Krishnamurthy is studied. It is shown that the question Of existence of a slow manifold for this model can be addressed by a combination of local and global analysis. Existence of a locally slow ...

Roberto Camassa; Siu-Kei Tin

1996-11-01T23:59:59.000Z

111

Nozzle for electric dispersion reactor  

DOE Patents (OSTI)

A nozzle for an electric dispersion reactor includes two coaxial cylindrical bodies, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode.

Sisson, Warren G. (Oak Ridge, TN); Harris, Michael T. (Knoxville, TN); Scott, Timothy C. (Knoxville, TN); Basaran, Osman A. (Oak Ridge, TN)

1996-01-01T23:59:59.000Z

112

Nozzle for electric dispersion reactor  

DOE Patents (OSTI)

A nozzle for an electric dispersion reactor includes two concentric electrodes, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode.

Sisson, Warren G. (Oak Ridge, TN); Basaran, Osman A. (Oak Ridge, TN); Harris, Michael T. (Knoxville, TN)

1995-01-01T23:59:59.000Z

113

Nozzle for electric dispersion reactor  

DOE Patents (OSTI)

A nozzle for an electric dispersion reactor includes two coaxial cylindrical bodies, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode.

Sisson, Warren G. (Oak Ridge, TN); Harris, Michael T. (Knoxville, TN); Scott, Timothy C. (Knoxville, TN); Basaran, Osman A. (Oak Ridge, TN)

1998-01-01T23:59:59.000Z

114

Nozzle for electric dispersion reactor  

DOE Patents (OSTI)

A nozzle for an electric dispersion reactor includes two concentric electrodes, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode.

Sisson, Warren G. (Oak Ridge, TN); Basaran, Osman A. (Oak Ridge, TN); Harris, Michael T. (Knoxville, TN)

1998-01-01T23:59:59.000Z

115

Perforated appendix presenting with severe diarrhea: findings on barium-enema examination  

SciTech Connect

Severe diarrhea and marked lower abdominal cramps are unusual manifestations of appendicitis. The authors performed a barium-enema examination (BE) on 9 pediatric patients who were utlimately shown to have a perforated appendix and pelvic abscesses. In 8 cases, the atypical symptoms initially led to an incorrect clinical diagnosis. In all 9, the BE demonstrated extensive inflammatory changes of the rectosigmoid colon, caused by the surrounding pelvic infection. Recognizing this clinical and radiographic association could lead to earlier diagnosis and treatment.

Picus, D.; Shackelford, G.D.

1983-10-01T23:59:59.000Z

116

CORRELATION OF EXPERIMENTAL DATA WITH THEORY FOR PERFORATED PLATES WITH A TRIANGULAR HOLE ARRAY  

SciTech Connect

The design of the S3G and S4G reactor pressure vessel heads led to a study of perforated plates. A correlation of perforated plate theory with experimental data is given. The test results and analysis used for the S3G model tests are presented along with a review of two other experimental programs in which the experimental data were correlated theory. The conclusions reached indicate that the perforated lattice does, in fact, behave as an equivalent plate of reduced stiffness when subjected to transverse loading. The results obtained from the theory are sufficiently accarate for engineering applications for a range of plate sizes which extends from thin plates (radius-to-thickness ratio 7.5 to 1 for Duncan's tube sheets) to thick plates (radius-to-thickness ratio 1.6 to 1 for the reactor model head) with a variation in the number of penetrations ranging from the large number in Duncan's tube sheet tests down to the relatively small number (19 holes) ia the reactor model head (3/8 scale model). (auth)

Deagle, L.

1958-01-01T23:59:59.000Z

117

Phonon dispersion in graphene  

E-Print Network (OSTI)

Taking into account the constraints imposed by the lattice symmetry, the phonon dispersion is calculated for graphene with interactions between the first and second nearest neighbors in the framework of the Born-von Karman model. Analytical expressions are obtained for the out-of-plane (bending) modes determined only by two force constants as well as for the in-plane modes with four force constants. Values of the force constants are found in fitting to elastic constants and Raman frequencies observed in graphite.

L. A. Falkovsky

2007-02-17T23:59:59.000Z

118

Demand Uncertainty and Price Dispersion.  

E-Print Network (OSTI)

??Demand uncertainty has been recognized as one factor that may cause price dispersion in perfectly competitive markets with costly and perishable capacity. With the persistence… (more)

Li, Suxi

2007-01-01T23:59:59.000Z

119

AN EXAMPLE OF ASYMPTOTICALLY CHOW UNSTABLE MANIFOLDS WITH CONSTANT SCALAR CURVATURE  

E-Print Network (OSTI)

In [2] Donaldson proved that if a polarized manifold (V, L) has constant scalar curvature Kähler metrics in c1(L) and its automorphism group Aut(V, L) is discrete, (V, L) is asymptotically Chow stable. In this paper, we shall show an example which implies that the above result does not hold in the case when Aut(V, L) is not discrete.

Hajime Ono; et al.

2009-01-01T23:59:59.000Z

120

A Geometric Interpretation of the ?-{y} Genus on Hyper-Kahler Manifolds  

E-Print Network (OSTI)

The group SL(2) acts on the space of cohomology groups of any hyper-Kahler manifold X. The \\chi_{y} genus of a hyper-Kahler X is shown to have a geometric interpretation as the super trace of an element of SL(2). As a by product one learns that the generalized Casson invariant for a mapping torus is essentially the \\chi_{y} genus.

George Thompson

1999-05-18T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Cosmological Models of Universe with Variable Deceleration Parameter in Lyra's Manifold  

E-Print Network (OSTI)

FRW models of the universe have been studied in the cosmological theory based on Lyra's manifold. A new class of exact solutions has been obtained by considering a time dependent displacement field for variable deceleration parameter from which three models of the universe are derived (i) exponential (ii) polynomial and (iii) sinusoidal form respectively. The behaviour of these models of the universe are also discussed. Finally some possibilities of further problems and their investigations have been pointed out.

A. Pradhan; J. P. Shahi; C. B. Singh

2006-08-14T23:59:59.000Z

122

Performance characteristics of a perforated shadow band under clear sky conditions  

SciTech Connect

A perforated, non-rotating shadow band is described for separating global solar irradiance into its diffuse and direct normal components using a single pyranometer. Whereas shadow bands are normally solid so as to occult the sensor of a pyranometer throughout the day, the proposed band has apertures cut from its circumference to intermittently expose the instrument sensor at preset intervals. Under clear sky conditions the device produces a saw tooth waveform of irradiance data from which it is possible to reconstruct separate global and diffuse curves. The direct normal irradiance may then be calculated giving a complete breakdown of the irradiance curves without need of a second instrument or rotating shadow band. This paper describes the principle of operation of the band and gives a mathematical model of its shading mask based on the results of an optical ray tracing study. An algorithm for processing the data from the perforated band system is described and evaluated. In an extended trial conducted at NREL's Solar Radiation Research Laboratory, the band coupled with a thermally corrected Eppley PSP produced independent curves for diffuse, global and direct normal irradiance with low mean bias errors of 5.6 W/m{sup 2}, 0.3 W/m{sup 2} and -2.6 W/m{sup 2} respectively, relative to collocated reference instruments. Random uncertainties were 9.7 W/m{sup 2} (diffuse), 17.3 W/m{sup 2} (global) and 19.0 W/m{sup 2} (direct). When the data processing algorithm was modified to include the ray trace model of sensor exposure, uncertainties increased only marginally, confirming the effectiveness of the model. Deployment of the perforated band system can potentially increase the accuracy of data from ground stations in predominantly sunny areas where instrumentation is limited to a single pyranometer. (author)

Brooks, Michael J. [School of Mechanical Engineering, University of KwaZulu-Natal, Durban (South Africa)

2010-12-15T23:59:59.000Z

123

Perforating collagenosis  

E-Print Network (OSTI)

collagenosis with doxycycline. Acta Derm Venereol 2002; 82:keratolytics, cryotherapy, doxycycline, allopurinol, and

Yancovitz, Molly; Johnson, Hillary; Wang, Nadia; Pomeranz, Miriam K

2008-01-01T23:59:59.000Z

124

First laboratory perforating tests in coal show lower-than-expected penetration  

Science Conference Proceedings (OSTI)

Worldwide Coal Bed Methane (CBM) resources are huge, estimated at 3,000 to 9,000 Tcf. The production rate from CBM reservoirs is low, perhaps 50-100 mcf/day. Various completion methods are being evaluated and new technologies are being developed with the aim of increasing production rates. Considering this interest and activity level, little attention has been paid to the CBM completion fundamentals. Perforating is a critical part of this process, especially considering the PRB development migration from single-coal, open-hole completions into multi-zone, cased-hole completions. This paper describes the first known laboratory-testing program to investigate shaped charge penetration in coal targets. We describe mechanical properties of the coals tested, and penetration results for different shaped charges (of different designs), shot at various stress conditions. CT scan and cutaway imaging of the perforation tunnels are also discussed. Tests were conducted under dry and saturated conditions. The preliminary experiments reported here indicate that shaped charge penetration in coal is significantly less than expected, considering the target's density and strength. The authors provide insight into what may be the reasons for these unexpected results and recommend a path forward for shaped charge testing, designs, predictive tools, and how to optimize CBM completions.

Snider, P.M.; Walton, I.C.; Skinner, T.K.; Atwood, D.C.; Grove, B.M.; Graham, C.

2008-06-15T23:59:59.000Z

125

Experiments in Support of Pressure Enhanced Penetration with Shaped Charge Perforators  

DOE Green Energy (OSTI)

Computational analysis demonstrated that the penetration of a shaped charge could be substantially enhanced by imploding the liner in a high pressure light gas atmosphere. The gas pressure helps confine the jet on the axis of penetration in the latter stages of formation. A light gas, such as helium or hydrogen, is required in order to keep the gas density low enough so as not to inhibit liner collapse. These results have now been confirmed by experiment. Identical 5-foot long guns, each containing 37 perforators at a shot density of 12 SPF, were inserted in two API Section 1 concrete targets, poured on the same day and cured for the same period. One of the guns was fired with interior ambient (0.1 MPa) air pressure and the other with helium at 13.8 MPa (2,000 psia). The average penetration from the 37 perforations with the helium system increased 40.3% over that obtained with the conventional system.

Glenn, L.A.; Chase, J.B.; Barker, J.; Leidel, D.J.

1999-11-01T23:59:59.000Z

126

Parameterizing Mesoscale Wind Uncertainty for Dispersion Modeling  

Science Conference Proceedings (OSTI)

A parameterization of numerical weather prediction uncertainty is presented for use by atmospheric transport and dispersion models. The theoretical development applies Taylor dispersion concepts to diagnose dispersion metrics from numerical wind ...

Leonard J. Peltier; Sue Ellen Haupt; John C. Wyngaard; David R. Stauffer; Aijun Deng; Jared A. Lee; Kerrie J. Long; Andrew J. Annunzio

2010-08-01T23:59:59.000Z

127

Numerical Dispersion of Gravity Waves  

Science Conference Proceedings (OSTI)

When atmospheric gravity waves are simulated in numerical models, they are not only dispersive for physical but also for numerical reasons. Their wave properties (e.g., damping or propagation speed and direction) can depend on grid spacing as ...

Guido Schroeder; K. Heinke Schlünzen

2009-12-01T23:59:59.000Z

128

The Dispersal of Protoplanetary Disks  

E-Print Network (OSTI)

Protoplanetary disks are the sites of planet formation, and the evolution and eventual dispersal of these disks strongly influences the formation of planetary systems. Disk evolution during the planet-forming epoch is driven by accretion and mass-loss due to winds, and in typical environments photoevaporation by high-energy radiation from the central star is likely to dominate final gas disk dispersal. We present a critical review of current theoretical models, and discuss the observations that are used to test these models and inform our understanding of the underlying physics. We also discuss the role disk dispersal plays in shaping planetary systems, considering its influence on both the process(es) of planet formation and the architectures of planetary systems. We conclude by presenting a schematic picture of protoplanetary disk evolution and dispersal, and discussing prospects for future work.

Alexander, Richard; Andrews, Sean; Armitage, Philip; Cieza, Lucas

2013-01-01T23:59:59.000Z

129

The Universal Perturbative Quantum 3-manifold Invariant, Rozansky-Witten Invariants, and the Generalized Casson Invariant  

E-Print Network (OSTI)

Let Z^{LMO} be the 3-manifold invariant of [LMO]. It is shown that Z^{LMO}(M)=1, if the first Betti number of M, b_{1}(M), is greater than 3. If b_{1}(M)=3, then Z^{LMO}(M) is completely determined by the cohomology ring of M. A relation of Z^{LMO} with the Rozansky-Witten invariants Z_{X}^{RW}[M] is established at a physical level of rigour. We show that Z_{X}^{RW}[M] satisfies appropriate connected sum properties suggesting that the generalized Casson invariant ought to be computable from the LMO invariant.

Nathan Habegger; George Thompson

1999-11-08T23:59:59.000Z

130

Influence of gas flow rate on liquid distribution in trickle-beds using perforated plates as liquid distributors  

E-Print Network (OSTI)

Influence of gas flow rate on liquid distribution in trickle- beds using perforated plates devices and a liquid collector were used to study the influence of the gas flow rate on liquid in liquid distribution were evidenced. Indeed, the obtained results show that the influence of gas flow rate

Paris-Sud XI, Université de

131

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 53, NO. 3, JUNE 2006 1659 Efficiencies of Coated and Perforated Semiconductor  

E-Print Network (OSTI)

be realized for doubled or "sand- wiched" devices. Index Terms--Perforated detector, semiconductor neutron de neutron detection by a variety of re- search groups [1]­[14], all of which have generally used B, Li, Li 66506 USA (e-mail: mc- gregor@ksu.edu). Digital Object Identifier 10.1109/TNS.2006.872639 enter

Shultis, J. Kenneth

132

Numerical simulation of high-speed penetration-perforation dynamics in layered armor shields  

E-Print Network (OSTI)

Penetration models and calculating algorithms are presented, describing the dynamics and fracture of composite armor shields penetrated by high-speed small arms. A shield considered consists of hard (metal or ceramic) facing and multilayered fabric backing. A simple formula is proved for the projectile residual velocity after perforation of a thin facing. A new plastic-flow jet model is proposed for calculating penetration dynamics in the case of a thick facing of ceramic or metal-ceramic FGM materials. By bringing together the developed models into a calculating algorithm, a computer tool is designed enabling simulations of penetration processes in the above-mentioned shields and analysis of optimization problems. Some results of computer simulation are presented. It is revealed in particular that strength proof of pliable backing can be better as compared with more rigid backing. Comparison of calculations and test data shows sufficient applicability of the models and the tool.

Ayzenberg-Stepanenko, Mark

2012-01-01T23:59:59.000Z

133

Numerical simulation of high-speed penetration-perforation dynamics in layered armor shields  

E-Print Network (OSTI)

Penetration models and calculating algorithms are presented, describing the dynamics and fracture of composite armor shields penetrated by high-speed small arms. A shield considered consists of hard (metal or ceramic) facing and multilayered fabric backing. A simple formula is proved for the projectile residual velocity after perforation of a thin facing. A new plastic-flow jet model is proposed for calculating penetration dynamics in the case of a thick facing of ceramic or metal-ceramic FGM materials. By bringing together the developed models into a calculating algorithm, a computer tool is designed enabling simulations of penetration processes in the above-mentioned shields and analysis of optimization problems. Some results of computer simulation are presented. It is revealed in particular that strength proof of pliable backing can be better as compared with more rigid backing. Comparison of calculations and test data shows sufficient applicability of the models and the tool.

Mark Ayzenberg-Stepanenko; Grigory Osharovich

2012-03-07T23:59:59.000Z

134

Thickness effects on the plastic collapse of perforated plates with triangular penetration patterns  

SciTech Connect

This paper investigates the effects of plate thickness on the accuracy of limit load solutions obtained using an elastic-perfectly plastic [EPP] equivalent solid [EQS] procedure for flat perforated plates with a triangular array of penetrations. The EQS approach for limit loads is based on an EQS collapse surface that is valid for generalized plane strain. This assumption is applicable for very thick plates but is known to be less reasonable for very thin plates where plane stress may be a better assumption. The limits of applicability of the generalized plane strain assumption are investigated by obtaining limit load solutions for perforated plates of various thicknesses that are subjected to in-plane and bending loads. Plastic limit load solutions obtained using three-dimensional EPP finite element analysis [FEA] of models which include each penetration explicitly are compared with solutions obtained using the EQS approximation. The penetration pattern chosen for this study has a ligament efficiency (ligament width-to-pitch ratio, h/P) of 0.32. For plates thicker than the pitch, the limit load calculated using the EQS method for both in-plane and bending loads is shown to be very accurate (within 4%) of the limit load calculated for the explicit model. On the other hand, for thin plates (t/P< 2), the EQS limit load is 5% greater than the explicit limit load for bending and 8% greater than the explicit limit load for in-plane loads. For thinner plates, the collapse surface is tied to the local geometry deformation and, hence, an equivalent solid plate representation of plastic collapse is a function of deformation mode and thickness.

Gordon, J.L.; Jones, D.P.; Holliday, J.E.

2000-03-01T23:59:59.000Z

135

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other. 5 figures.

Ikezi, H.; Lin-Liu, Y.R.; DeGrassie, J.S.

1991-08-27T23:59:59.000Z

136

Dispersion-compensated Fresnel lens  

DOE Patents (OSTI)

A transmission grating is used to reduce chromatic aberration in a Fresnel lens, wherein the lens chromatic dispersion is offset and substantially canceled by the grating's diffraction-induced dispersion. The grating comprises a Fresnel-type pattern of microscopic facets molded directly into the lens surface. The facets would typically have a profile height of around 4[times]10[sup [minus]5] inch and a profile width of at least 10[sup [minus]3] inch. In its primary intended application, the invention would function to improve the optical performance of a Fresnel lens used to concentrate direct sunlight. 10 figs.

Johnson, K.C.

1992-11-03T23:59:59.000Z

137

DISPERSION HARDENING OF URANIUM METAL  

DOE Patents (OSTI)

A method of hardening U metal involves the forming of a fine dispersion of UO/sub 2/. This method consists of first hydriding the U to form a finely divided powder and then exposing the powder to a very dilute O gas in an inert atmosphere under such pressure and temperature conditions as to cause a thin oxide film to coat each particle of the U hydride, The oxide skin prevents agglomeration of the particles as the remaining H is removed, thus preserving the small particle size. The oxide skin coatings remain as an oxide dispersion. The resulting product may be workhardened to improve its physical characteristics. (AEC)

Arbiter, W.

1963-01-15T23:59:59.000Z

138

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other.

Ikezi, Hiroyuki (Rancho Santa Fe, CA); Lin-Liu, Yuh-Ren (San Diego, CA); DeGrassie, John S. (Encinitas, CA)

1991-01-01T23:59:59.000Z

139

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission lines between two adjacent periodic intersections to be longer than the other. 5 figs.

Ikezi, Hiroyuki; Lin-Liu, Yuh-Ren; deGrassie, J.S.

1990-03-02T23:59:59.000Z

140

FORMATION OF INTERMETALLIC COMPOUND DISPERSIONS  

DOE Patents (OSTI)

BS>A method is presented for preparing dispersions containing thorium bismuthide in equiaxed form and having an average particle size of about 30 microns. Thorium particles having one dimension not greater than 0.015 in. are immersed in liquid bismuth at a temperature between 500 and 600 deg C, the quantity of thorium being in excess of its solubility in the bismuth.

Bryner, J.S.

1959-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

The geometry of Grassmannian manifolds and Bernstein type theorems for higher codimension  

E-Print Network (OSTI)

We identify a region $\\Bbb{W}_{\\f{1}{3}}$ in a Grassmann manifold $\\grs{n}{m}$, not covered by a usual matrix coordinate chart, with the following important property. For a complete $n-$submanifold in $\\ir{n+m} \\, (n\\ge 3, m\\ge2)$ with parallel mean curvature whose image under the Gauss map is contained in a compact subset $K\\subset\\Bbb{W}_{\\f{1}{3}}\\subset\\grs{n}{m}$, we can construct strongly subharmonic functions and derive a priori estimates for the harmonic Gauss map. While we do not know yet how close our region is to being optimal in this respect, it is substantially larger than what could be achieved previously with other methods. Consequently, this enables us to obtain substantially stronger Bernstein type theorems in higher codimension than previously known.

Jost, J; Yang, Ling

2011-01-01T23:59:59.000Z

142

Manifold, bus support and coupling arrangement for solid oxide fuel cells  

DOE Patents (OSTI)

Individual, tubular solid oxide fuel cells (SOFCs) are assembled into bundles called a module within a housing, with a plurality of modules arranged end-to-end in a linear, stacked configuration called a string. A common set of piping comprised of a suitable high temperature resistant material (1) provides fuel and air to each module housing, (2) serves as electrically conducting buses, and (3) provides structural support for a string of SOFC modules. Ceramic collars are used to connect fuel and air inlet piping to each of the electrodes in an SOFC module and provide (1) electrical insulation for the current carrying bus bars and gas manifolds, (2) damping for the fuel and air inlet piping, and (3) proper spacing between the fuel and air inlet piping to prevent contact between these tubes and possible damage to the SOFC. 11 figs.

Parry, G.W.

1988-04-21T23:59:59.000Z

143

Green functions and dimensional reduction of quantum fields on product manifolds  

E-Print Network (OSTI)

We discuss Euclidean Green functions on product manifolds P=NxM. We show that if M is compact then the Euclidean field on P can be approximated by its zero mode which is a Euclidean field on N. We estimate the remainder of this approximation. We show that for large distances on N the remainder is small. If P=R^{D-1}xS^{beta}, where S^{beta} is a circle of radius beta, then the result reduces to the well-known approximation of the D dimensional finite temperature quantum field theory to D-1 dimensional one in the high temperature limit. Analytic continuation of Euclidean fields is discussed briefly.

Haba, Z

2007-01-01T23:59:59.000Z

144

Advances and Applications of Intrinsic Low Dimensional Manifold Theory Joseph M. Powers, Samuel Paolucci, and Sandeep Singh  

E-Print Network (OSTI)

scales of chemical reaction. Simple and often useful strategies which capture some of the kinetic time systematically reduce chemical kinetic models in such a way that consistency with full model equationsAdvances and Applications of Intrinsic Low Dimensional Manifold Theory Joseph M. Powers, Samuel

145

INTRINSIC VARIANCE LOWER BOUND (IVLB): AN EXTENSION OF THE CRAM ER-RAO BOUND TO RIEMANNIAN MANIFOLDS  

E-Print Network (OSTI)

MANIFOLDS Jo~ao Xavier and Victor Barroso Instituto Superior T´ecnico ­ Instituto de Sistemas e Rob´otica Av Analysis. 2nd ed. Springer-Verlag. [7] S. Gallot, D. Hulin, and J. Lafontaine. Riemannian Geome- try, 2nd

146

Powdered coal air dispersion nozzle  

SciTech Connect

An improved coal/air dispersion nozzle introduces fuel into the combustion chamber of a gas turbine engine as a finely atomized, dispersed spray for a uniform combustion. The nozzle has an inlet that receives finely powdered coal from a coal transport or coal/air fluidizer system and a scroll swirl generator is included within the nozzle to swirl a fluidized coal/air mixture supplied to the inlet of the nozzle. The scroll is in the form of a thin, flat metal sheet insert, twisted along its length, and configured to prevent build-up of coal particles within the nozzle prior to ejection from its outlet. Airblast air jets are included along the length of the nozzle body to assist in the discharge of the fluidized coal from the nozzle outlet and an angular pintle tip overlies the outlet to redirect coal/air mixture through a desired fluidized coal spray angle.

Kosek, T.P.; Steinhilper, E.A.

1981-10-27T23:59:59.000Z

147

Tracer dispersion in the turbulent convective layer  

Science Conference Proceedings (OSTI)

Experimental results for passive tracer dispersion in the turbulent surface layer under convective conditions are presented. In this case, the dispersion of tracer particles is determined by the interplay of two mechanisms: buoyancy and advection. ...

Alex Skvortsov; Milan Jamriska; Timothy C. DuBois

148

The Atmospheric Mesoscale Dispersion Modeling System  

Science Conference Proceedings (OSTI)

The mesoscale dispersion modeling system (MDMS) described herein is under development as a simulation tool to investigate atmospheric flow and pollution dispersion over complex terrain for domains up to several hundred kilometers. The system ...

Marek Uliasz

1993-01-01T23:59:59.000Z

149

Dispersion into Severe Coastal Complex Terrain  

Science Conference Proceedings (OSTI)

A field study of dispersion using tracer gases from offshore sources into severe coastal complex terrain was conducted in central California. Data were collected on dispersion, surface concentrations trajectories, and stability. An examination of ...

Timothy C. Spangler; James W. Keating

1990-01-01T23:59:59.000Z

150

Resonant radiation shed by dispersive shock waves  

E-Print Network (OSTI)

We show that dispersive shock waves resulting from the nonlinearity overbalancing a weak leading-order dispersion can emit resonant radiation owing to higher-order dispersive contributions. We analyze such phenomenon for the defocusing nonlinear Schroedinger equation, giving criteria for calculating the radiated frequency based on the estimate of the shock velocity, revealing also a diversity of possible scenarios depending on the order and magnitude of the dispersive corrections.

Conforti, Matteo; Trillo, Stefano

2013-01-01T23:59:59.000Z

151

Dispersion enhanced metal/zeolite catalysts  

DOE Patents (OSTI)

Dispersion stabilized zeolite supported metal catalysts are provided as bimetallic catalyst combinations. The catalyst metal is in a reduced zero valent form while the dispersion stabilizer metal is in an unreduced ionic form. Representative catalysts are prepared from platinum or nickel as the catalyst metal and iron or chromium dispersion stabilizer.

Sachtler, Wolfgang M. H. (Evanston, IL); Tzou, Ming-Shin (Evanston, IL); Jiang, Hui-Jong (Evanston, IL)

1987-01-01T23:59:59.000Z

152

Determination of Longitudinal Dispersion Coefficient and Net  

E-Print Network (OSTI)

, New York, New York 10027 Physical processes such as advection, dispersion, and air-water gas exchange of the gas tracer, u is the average cross-sectional current velocity, Kx is the longitudinal dispersion in the Hudson River. Similar to the difference in longitudinal dispersion coefficients, the difference in gas

Ho, David

153

Study of Pollutant Dispersion in Urban Environments  

E-Print Network (OSTI)

-17 June, University of Osnabruck, Germany. 9. Simonite, T., 2005, Anti-terror study tracks gas dispersalStudy of Pollutant Dispersion in Urban Environments Razvan Corneliu Carbunescu Center head: Study of pollutant dispersion in urban environments #12;Abstract Computational simulations can

Allen, Gabrielle

154

Short-Range Atmospheric Dispersion of Carbon Dioxide  

E-Print Network (OSTI)

layer model for heavy gas dispersion from natural sources:data to analyze dense gas dispersion modeling issues. Atmosforum (perf) dense gas dispersion modeling project. Atmos

Cortis, Andrea; Oldenburg, Curtis M.

2009-01-01T23:59:59.000Z

155

A collapse surface for a perforated plate with an equilateral triangular array of penetrations  

SciTech Connect

This paper describes the development of incipient yield and subsequent collapse surfaces for a plate containing a large number of small circular penetrations arranged in an equilateral triangular array. The collapse surface developed here is appropriate for formulating a generic elastic-plastic flow theory for perforated materials. A unit cell is defined to characterize the mechanical response of an equilateral triangular array of penetrations. An elastic-perfectly plastic [EPP] finite element analysis [FEA] computer program is used to calculate the EPP response of the unit cell. A sufficient number of load cases are solved to define the complete incipient yield and collapse surfaces for the unit cell. A fourth order yield function is defined by squaring the Von Mises quadratic yield function and retaining only those terms that are required for the symmetry dictated by the triangular array. Curve fitting is used to determine the coefficients of the fourth order function to match the incipient yield and collapse data calculated for the unit cell by FEA. The incipient yield function in the plane of the plate incorporating the penetration pattern is shown to be almost rhomboidal in shape while the collapse curve is more elliptical. The fourth order yield function which passes through the incipient yield data possess regions where the surface is concave--a concern when developing a plasticity theory based on the function. Fitting the coefficients of the fourth order function to the collapse data results in a curve which is shown to be always convex thus having all positive outward normal vectors which is a required property for the development of plasticity flow theories.

Gordon, J.L.; Jones, D.P.; Hutula, D.N.; Banas, D.

1999-02-01T23:59:59.000Z

156

TECHNOLOGIES TO ENHANCE THE OPERATION OF EXISTING NATURAL GAS COMPRESSION INFRASTRUCTURE - MANIFOLD DESIGN FOR CONTROLLING ENGINE AIR BALANCE  

SciTech Connect

This document provides results and conclusions for Task 15.0--Detailed Analysis of Air Balance & Conceptual Design of Improved Air Manifolds in the ''Technologies to Enhance the Operation of Existing Natural Gas Compression Infrastructure'' project. SwRI{reg_sign} is conducting this project for DOE in conjunction with Pipeline Research Council International, Gas Machinery Research Council, El Paso Pipeline, Cooper Compression, and Southern Star, under DOE contract number DE-FC26-02NT41646. The objective of Task 15.0 was to investigate the perceived imbalance in airflow between power cylinders in two-stroke integral compressor engines and develop solutions via manifold redesign. The overall project objective is to develop and substantiate methods for operating integral engine/compressors in gas pipeline service, which reduce fuel consumption, increase capacity, and enhance mechanical integrity.

Gary D. Bourn; Ford A. Phillips; Ralph E. Harris

2005-12-01T23:59:59.000Z

157

On trajectories of vortices in the compressible fluid on a two-dimensional manifold  

E-Print Network (OSTI)

For the model of a compressible barotropic fluid on a two dimensional rotating Riemmanian manifold we discuss a special class of smooth solutions having a form of a steady non-singular vortex moving with a bearing field. The model can be obtained from the system of primitive equations governing the motion of air over the Earth surface after averaging over the height and therefore the solution obtained can be interpreted as a tropical cyclone which is known as a long time existing stable vortex. We consider approximations of $l$- plane and $\\beta$ - plane used in geophysics for modeling of middle scale processes and equations on the whole sphere as well. We show that the solutions of the mentioned form satisfy the equations of the model either exactly or with a discrepancy which is small in a neighborhood of the trajectory of the center of vortex. We perform a numeric study of the change of the shape of the vortex affected by the neglecting the discrepancy term.

Rozanova, Olga S; Hu, Chin-Kun

2010-01-01T23:59:59.000Z

158

On trajectories of vortices in the compressible fluid on a two-dimensional manifold  

E-Print Network (OSTI)

For the model of a compressible barotropic fluid on a two dimensional rotating Riemmanian manifold we discuss a special class of smooth solutions having a form of a steady non-singular vortex moving with a bearing field. The model can be obtained from the system of primitive equations governing the motion of air over the Earth surface after averaging over the height and therefore the solution obtained can be interpreted as a tropical cyclone which is known as a long time existing stable vortex. We consider approximations of $l$- plane and $\\beta$ - plane used in geophysics for modeling of middle scale processes and equations on the whole sphere as well. We show that the solutions of the mentioned form satisfy the equations of the model either exactly or with a discrepancy which is small in a neighborhood of the trajectory of the center of vortex. We perform a numeric study of the change of the shape of the vortex affected by the neglecting the discrepancy term.

Olga S. Rozanova; Jui-Ling Yu; Chin-Kun Hu

2010-11-10T23:59:59.000Z

159

A C*-algebra for quantized principal U(1)-connections on globally hyperbolic Lorentzian manifolds  

E-Print Network (OSTI)

The aim of this work is to complete our program on the quantization of connections on arbitrary principal U(1)-bundles over globally hyperbolic Lorentzian manifolds. In particular, we show that one can assign via a covariant functor to any such bundle an algebra of observables which separates gauge equivalence classes of connections. The C*-algebra we construct generalizes the usual CCR-algebras since, contrary to the standard field-theoretic models, it is based on a presymplectic Abelian group instead of a symplectic vector space. We prove a no-go theorem according to which neither this functor, nor any of its quotients, satisfy the strict axioms of general local covariance. Yet, if we fix any principal U(1)-bundle, there exists a suitable category of sub-bundles for which a quotient of our functor yields a quantum field theory in the sense of Haag and Kastler. We shall provide a physical interpretation of this feature and we obtain some new insights concerning electric charges in locally covariant quantum field theory.

Marco Benini; Claudio Dappiaggi; Thomas-Paul Hack; Alexander Schenkel

2013-07-11T23:59:59.000Z

160

Manifold, bus support and coupling arrangement for solid oxide fuel cells  

DOE Patents (OSTI)

Individual, tubular solid oxide fuel cells (SOFCs) are assembled into bundles called a module within a housing, with a plurality of modules arranged end-to-end in a linear, stacked configuration called a string. A common set of piping comprised of a suitable high temperture resistant material (1) provides fuel and air to each module housing, (2) serves as electrically conducting buses, and (3) provides structural support for a string of SOFC modules. The piping thus forms a manfold for directing fuel and air to each module in a string and makes electrical contact with the module's anode and cathode to conduct the DC power generated by the SOFC. The piping also provides structureal support for each individual module and maintains each string of modules as a structurally integral unit for ensuring high strength in a large 3-dimensional array of SOFC modules. Ceramic collars are used to connect fuel and air inlet piping to each of the electrodes in an SOFC module and provide (1) electrical insulation for the current carrying bus bars and gas manifolds, (2) damping for the fuel and air inlet piping, and (3) proper spacing between the fuel and air inlet piping to prevent contact between these tubes and possible damage to the SOFC.

Parry, Gareth W. (East Windsor, CT)

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Linear PDEs and eigenvalue problems corresponding to ergodic stochastic optimization problems on compact manifolds  

E-Print Network (OSTI)

We consider long term average or `ergodic' optimal control poblems with a special structure: Control is exerted in all directions and the control costs are proportional to the square of the norm of the control field with respect to the metric induced by the noise. The long term stochastic dynamics on the manifold will be completely characterized by the long term density $\\rho$ and the long term current density $J$. As such, control problems may be reformulated as variational problems over $\\rho$ and $J$. We discuss several optimization problems: the problem in which both $\\rho$ and $J$ are varied freely, the problem in which $\\rho$ is fixed and the one in which $J$ is fixed. These problems lead to different kinds of operator problems: linear PDEs in the first two cases and a nonlinear PDE in the latter case. These results are obtained through through variational principle using infinite dimensional Lagrange multipliers. In the case where the initial dynamics are reversible we obtain the result that the optimally controlled diffusion is also symmetrizable. The particular case of constraining the dynamics to be reversible of the optimally controlled process leads to a linear eigenvalue problem for the square root of the density process.

Joris Bierkens; Vladimir Y. Chernyak; Michael Chertkov; Hilbert J. Kappen

2013-03-01T23:59:59.000Z

162

Dimensionality estimate of the manifold in chemical composition space for a turbulent premixed H2+air flame  

DOE Green Energy (OSTI)

The dimensionality (D) of manifolds of active chemical composition space has been measured using three different approaches: the Hausdorff geometrical binning method, Principal Component Analysis, and the Grassberger-Procaccia cumulative distribution method. A series of artificial manifolds is also generated using a Monte Carlo approach to discern the advantages and limitations of the three methods. Dimensionality is quantified for different levels of turbulent intensity in a simulation of the interactions of a 2D premixed hydrogen flame with a localized region of turbulence superimposed over the cold region upstream of the flame front. The simulations are conducted using an adaptive mesh refinement code for low Mach number reacting flows. By treating the N{sub s} species and temperature of the local thermo-chemical state as a point in multi-dimensional chemical composition space, a snapshot of a flame region is mapped into chemical composition space to generate the manifold associated with the 2-D flame system. An increase in D was observed with increasing turbulent intensity for all three methods. Although each method provides useful information, the Grassberger-Procaccia method is subject to fewer artifacts than the other two thereby providing the most reliable quantification of D.

Tonse, Shaheen R.; Brown, Nancy J.

2003-02-26T23:59:59.000Z

163

Invariance properties of boundary sets of open embeddings of manifolds and their application to the abstract boundary  

E-Print Network (OSTI)

The {\\em abstract boundary\\/} (or {\\em {\\em a\\/}-boundary\\/}) of Scott and Szekeres \\cite{Scott94} constitutes a ``boundary'' to any $n$-dimensional, paracompact, connected, Hausdorff, $C^\\infty$-manifold (without a boundary in the usual sense). In general relativity one deals with a {\\em space-% time\\/} $(\\cM,g)$ (a 4-dimensional manifold $\\cM$ with a Lorentzian metric $g$), together with a chosen preferred class of curves in $\\cM$. In this case the {\\em a\\/}-boundary points may represent ``singularities'' or ``points at infinity''. Since the {\\em a\\/}-boundary itself, however, does not depend on the existence of further structure on the manifold such as a Lorentzian metric or connection, it is possible for it to be used in many contexts. In this paper we develop some purely topological properties of abstract boundary sets and abstract boundary points ({\\em a\\/}-boundary points). We prove, amongst other things, that compactness is invariant under boundary set equivalence, and introduce another invariant concept ({\\em isolation\\/}), which encapsulates the notion that a boundary set is ``separated'' from other boundary points of the same embedding. ....... [The abstract continues in paper proper - truncated to fit here.

Christopher J. Fama; Susan M. Scott

1994-06-16T23:59:59.000Z

164

3D CFD ELECTROCHEMICAL AND HEAT TRANSFER MODEL OF AN INTERNALLY MANIFOLDED SOLID OXIDE ELECTROLYSIS CELL  

DOE Green Energy (OSTI)

A three-dimensional computational fluid dynamics (CFD) electrochemical model has been created to model high-temperature electrolysis cell performance and steam electrolysis in an internally manifolded planar solid oxide electrolysis cell (SOEC) stack. This design is being evaluated at the Idaho National Laboratory for hydrogen production from nuclear power and process heat. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, operating potential, steam-electrode gas composition, oxygen-electrode gas composition, current density and hydrogen production over a range of stack operating conditions. Single-cell and five-cell results will be presented. Flow distribution through both models is discussed. Flow enters from the bottom, distributes through the inlet plenum, flows across the cells, gathers in the outlet plenum and flows downward making an upside-down ''U'' shaped flow pattern. Flow and concentration variations exist downstream of the inlet holes. Predicted mean outlet hydrogen and steam concentrations vary linearly with current density, as expected. Effects of variations in operating temperature, gas flow rate, oxygen-electrode and steam-electrode current density, and contact resistance from the base case are presented. Contour plots of local electrolyte temperature, current density, and Nernst potential indicate the effects of heat transfer, reaction cooling/heating, and change in local gas composition. Results are discussed for using this design in the electrolysis mode. Discussion of thermal neutral voltage, enthalpy of reaction, hydrogen production, cell thermal efficiency, cell electrical efficiency, and Gibbs free energy are discussed and reported herein.

Grant L. Hawkes; James E. O'Brien; Greg Tao

2011-11-01T23:59:59.000Z

165

Thermal Ion Dispersion | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Thermal Ion Dispersion Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Thermal Ion Dispersion Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geochemical Techniques Exploration Sub Group: Geochemical Data Analysis Parent Exploration Technique: Geochemical Data Analysis Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Thermal Ion Dispersion: Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples

166

Dispersivity as an oil reservoir rock characteristic  

Science Conference Proceedings (OSTI)

The main objective of this research project is to establish dispersivity, {alpha}{sub d}, as an oil reservoir rock characteristic and to use this reservoir rock property to enhance crude oil recovery. A second objective is to compare the dispersion coefficient and the dispersivity of various reservoir rocks with other rock characteristics such as: porosity, permeability, capillary pressure, and relative permeability. The dispersivity of a rock was identified by measuring the physical mixing of two miscible fluids, one displacing the other in a porous medium. 119 refs., 27 figs., 12 tabs.

Menzie, D.E.; Dutta, S.

1989-12-01T23:59:59.000Z

167

Chemical Synthesis and Physical Dispersion of Cobalt ...  

Science Conference Proceedings (OSTI)

To obtain uniform and dispersion of cobalt particles used ultrasonic ... Fabrication of Structural and/or Functional Powders by Gas Atomization Process.

168

Dispersion Strengthened Sheet Alloys for Exhaust Component ...  

Science Conference Proceedings (OSTI)

solidification processing and the dispersion strengthening concept in a Ni-base ... generally carried out in a low vacuum, inert gas atmosphere chamber. Powder ...

169

PRICE LEVELS AND DISPERSION WITH ASYMMETRIC INFORMATION.  

E-Print Network (OSTI)

??In the extensive literature on price dispersions that exists to date, there is a gap in the analysis of how market structure affects prices as… (more)

Bhattacharya, Tanmoy

2011-01-01T23:59:59.000Z

170

Dispersion compensation for attosecond electron pulses  

Science Conference Proceedings (OSTI)

We propose a device to compensate for the dispersion of attosecond electron pulses. The device uses only static electric and magnetic fields and therefore does not require synchronization to the pulsed electron source. Analogous to the well-known optical dispersion compensator, an electron dispersion compensator separates paths by energy in space. Magnetic fields are used as the dispersing element, while a Wien filter is used for compensation of the electron arrival times. We analyze a device with a size of centimeters, which can be applied to ultrafast electron diffraction and microscopy, and fundamental studies.

Hansen, Peter; Baumgarten, Cory; Batelaan, Herman; Centurion, Martin [Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 (United States)

2012-08-20T23:59:59.000Z

171

Adaptive Urban Dispersion Integrated Model  

DOE Green Energy (OSTI)

Numerical simulations represent a unique predictive tool for understanding the three-dimensional flow fields and associated concentration distributions from contaminant releases in complex urban settings (Britter and Hanna 2003). Utilization of the most accurate urban models, based on fully three-dimensional computational fluid dynamics (CFD) that solve the Navier-Stokes equations with incorporated turbulence models, presents many challenges. We address two in this work; first, a fast but accurate way to incorporate the complex urban terrain, buildings, and other structures to enforce proper boundary conditions in the flow solution; second, ways to achieve a level of computational efficiency that allows the models to be run in an automated fashion such that they may be used for emergency response and event reconstruction applications. We have developed a new integrated urban dispersion modeling capability based on FEM3MP (Gresho and Chan 1998, Chan and Stevens 2000), a CFD model from Lawrence Livermore National Lab. The integrated capability incorporates fast embedded boundary mesh generation for geometrically complex problems and full three-dimensional Cartesian adaptive mesh refinement (AMR). Parallel AMR and embedded boundary gridding support are provided through the SAMRAI library (Wissink et al. 2001, Hornung and Kohn 2002). Embedded boundary mesh generation has been demonstrated to be an automatic, fast, and efficient approach for problem setup. It has been used for a variety of geometrically complex applications, including urban applications (Pullen et al. 2005). The key technology we introduce in this work is the application of AMR, which allows the application of high-resolution modeling to certain important features, such as individual buildings and high-resolution terrain (including important vegetative and land-use features). It also allows the urban scale model to be readily interfaced with coarser resolution meso or regional scale models. This talk will discuss details of the approach and present results for some example calculations performed in Manhattan in support of the DHS Urban Dispersion Program (UDP) using some of the tools developed as part of this new capability.

Wissink, A; Chand, K; Kosovic, B; Chan, S; Berger, M; Chow, F K

2005-11-03T23:59:59.000Z

172

Method of dispersing a hydrocarbon using bacteria  

DOE Patents (OSTI)

New protozoan derived microbial consortia and method for their isolation are provided. Consortia and bacteria isolated therefrom are useful for treating wastes such as trichloroethylene and trinitrotoluene. Consortia, bacteria isolated therefrom, and dispersants isolated therefrom are useful for dispersing hydrocarbons such as oil, creosote, wax, and grease.

Tyndall, Richard L. (Clinton, TN)

1996-01-01T23:59:59.000Z

173

Oil and Water Dispersion Technology Licensing Opportunity  

E-Print Network (OSTI)

Oil and Water Dispersion Technology Licensing Opportunity Technology Brief Professor Richard can be achieved by the process of degassing. The removal of dissolved gas, for example in oil dispersions. While laboratory scale degassing is predominantly batch processed and time consuming, Professor

174

Justification for change in AXAIR dispersion coefficients  

Science Conference Proceedings (OSTI)

AXAIR is the primary dose assessment code used at the Savannah River Site (SRS) to predict doses following hypothetical releases of relatively short durations. The atmospheric dispersion coefficients currently used in AXAIR are analytical expressions developed to fit the curves in the Turner Workbook as referred to in USNRC Regulatory Guide 1.145. This report explores the ramifications and benefits of changing the dispersion coefficients to a combination of Pasquill`s lateral dispersion coefficients and Briggs` vertical dispersion coefficients. The differences in the dispersion coefficients have a minor effect on the relative air concentrations for stability classes A--D, but a significant difference is seen for classes E, F, and G.

Simpkins, A.A.

1994-02-01T23:59:59.000Z

175

A two-point boundary value problem on a Lorentz manifold arising in A. Poltorak's concept of reference frame  

E-Print Network (OSTI)

In A. Poltorak's concept, the reference frame in General Relativity is a certain manifold equipped with a connection. The question under consideration here is whether it is possible to join two events in the space-time by a time-like geodesic if they are joined by a geodesic of the reference frame connection that has a time-like initial vector. This question is interpreted as whether an event belongs to the proper future of another event in the space-time in case it is so in the reference frame. For reference frames of two special types some geometric conditions are found under which the answer is positive.

Yu. E. Gliklikh; P. S. Zykov

2006-10-12T23:59:59.000Z

176

Influence of gas flow rate on liquid distribution in trickle-beds using perforated plates as liquid distributors  

E-Print Network (OSTI)

Two wire mesh tomography devices and a liquid collector were used to study the influence of the gas flow rate on liquid distribution when fluids distribution on top of the reactor is ensured by a perforated plate. In opposition to most of the studies realized by other authors, conditions in which the gas has a negative impact in liquid distribution were evidenced. Indeed, the obtained results show that the influence of gas flow rate depends on the quality of the initial distribution, as the gas forces the liquid to "respect" the distribution imposed at the top of the reactor. Finally, a comparison between the two measuring techniques shows the limitations of the liquid collector and the improper conclusions to which its use could lead.

Llamas, Juan-David; Wild, Gabriel

2008-01-01T23:59:59.000Z

177

A manifold of possible physics-laws in a universe where the planck constant and speed of light parameters vary  

E-Print Network (OSTI)

I assume a universe whereby the speed of light and the planck constant are not constants but instead parameters that vary locally in time-and space. When describing motion, I am able to derive a modified path integral description at the quantum level, which offers a natural extension of quantum mechanics. At the microscopic level, this path integral intuitively describes a physics with many quantum realities thus leading to a novel concept of manifold of physics, which can be looked at as a novel action principle. This paradigm reflects the notion that the observed laws of physics on any given scale are determined by the underlying distribution of the fundamental parameters (i.e Quantum Mechanics is just one point on this manifold), thus leading to many possible physical-law based behaviors. By choosing a Gaussian distribution of the parameters, a quadratic action term appears in the path-integral, which in turns leads to a complex classical action (and by continuation a new description for inertia) at the classical level. In the accompanying manuscript the classical doublet equation of motion is applied to the Newtonian gravitation field, and a MOND-like, dark-energy-like, and pioneer-anomaly-like solutions are derived.

Roee Amit

2008-02-14T23:59:59.000Z

178

Short-range atmospheric dispersion of carbon dioxide  

E-Print Network (OSTI)

important. We model dense gas dispersion using the steady-eld data to analyze dense gas dispersion mod- eling issues.element modeling of gas dispersion in the atmosphere. In:

Cortis, A.

2010-01-01T23:59:59.000Z

179

Definition: Thermal Ion Dispersion | Open Energy Information  

Open Energy Info (EERE)

Dispersion Dispersion Jump to: navigation, search Dictionary.png Thermal Ion Dispersion Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples and analyses of ions by an enzyme leach process done by commercial laboratories. The method utilizes the property of elements to be dissolved, transported, or deposited depending on the temperature of the thermal waters.{{#tag:ref|[[Final Technical Report}}[1][2][3][4] Also Known As enzyme leach References ↑ Geothermal Resource Evaluation And Definitioni (Gred) Program-Phases I ↑ Ii ↑ And Iii For The Animas Valley ↑ Nm Geothermal Resource]] {{#set:Reference URI={{#explode:{{#replace:[[Final Technical Report|[|}}|

180

Dispersed Project Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Dispersed Project Wind Farm Dispersed Project Wind Farm Jump to: navigation, search Name Dispersed Project Wind Farm Facility Dispersed Project Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Developer Northern Alternative Energy Energy Purchaser Xcel Energy Location Lincoln County MN Coordinates 44.4039°, -96.2646° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.4039,"lon":-96.2646,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

A Reevaluation of Two Dispersion Theories  

Science Conference Proceedings (OSTI)

Three of the atmospheric datasets that were originally used to verity statistical dispersion theory are reevaluated. These datasets are described as well by transilient turbulence theory as by statistical theory over the range of time periods of ...

Roland Stull

1988-07-01T23:59:59.000Z

182

Observing Surf-Zone Dispersion with Drifters  

Science Conference Proceedings (OSTI)

Surf-zone dispersion is studied using drifter observations collected within about 200 m of the shoreline (at depths of less than about 5 m) on a beach with approximately alongshore uniform bathymetry and waves. There were about 70 individual ...

Matthew Spydell; Falk Feddersen; R. T. Guza; W. E. Schmidt

2007-12-01T23:59:59.000Z

183

Meteorological Tracer Techniques for Parameterizing Atmospheric Dispersion  

Science Conference Proceedings (OSTI)

Although tracer materials have been used in atmospheric dispersion studies for decades, basic information about meteorological tracer techniques is scattered among a number of different sources. This paper attempts to pull together this ...

Warren B. Johnson

1983-05-01T23:59:59.000Z

184

Energy Dispersion in African Easterly Waves  

Science Conference Proceedings (OSTI)

The existence of an upstream (eastward) group velocity for African easterly waves (AEWs) is shown based on single-point lag regressions using gridded reanalysis data from 1990 to 2010. The eastward energy dispersion is consistent with the ...

Michael Diaz; Anantha Aiyyer

2013-01-01T23:59:59.000Z

185

Salt Dispersion in the Hudson Estuary  

Science Conference Proceedings (OSTI)

The seaward transport of salt by river discharge through an estuary is balanced under steady conditions by landward dispersion effected by various physical mixing processes. Observations of current and salinity in the lower Hudson estuary provide ...

Kenneth Hunkins

1981-05-01T23:59:59.000Z

186

Improving SCIPUFF Dispersion Forecasts with NWP Ensembles  

Science Conference Proceedings (OSTI)

The relationships between atmospheric transport and dispersion (AT&D) plume uncertainty and uncertainties in the transporting wind fields are investigated using the Second-Order Closure, Integrated Puff (SCIPUFF) AT&D model driven by numerical ...

Jared A. Lee; L. Joel Peltier; Sue Ellen Haupt; John C. Wyngaard; David R. Stauffer; Aijun Deng

2009-11-01T23:59:59.000Z

187

Dispersion of Heavy Particles by Turbulent Motion  

Science Conference Proceedings (OSTI)

Accurate prediction of heavy particle dispersion in turbulent flows requires a simultaneous consideration of particle's inertia and particle's drift velocity. A mathematically simple and physically comprehensive analysis was developed to solve ...

Lian-Ping Wang; Davd E. Stock

1993-07-01T23:59:59.000Z

188

Dispersed Bubble Reactor For Enhanced Gas-Liquid-Solids ...  

An apparatus to promote gas-liquid contact and facilitate enhanced mass transfer. The dispersed bubble reactor (DBR) operates in the dispersed bubble ...

189

Multiple peaks due to EIT and Autler-Townes effect in Lambda-probing of the strongly driven 5P3/2 manifold of cold 85  

E-Print Network (OSTI)

coupling of the hyperfine manifold 5P3/2(F') with the 5S1/2(F=2) ground state of cold 85 Rb atoms in MOT of the polarized light induced transitions between Zeeman substates, involving (F'=2, m') and (F'=3, m') upper) ground state. The probe transmission spectra were registered in the presence of the coupling field

190

Analysis and correction of vertical dispersion in RHIC  

SciTech Connect

In the context of preserving the polarization of proton beams, the source of vertical dispersion in RHIC is analyzed. Contributions to dispersion from non-coupling sources and coupling sources are compared. Based on the analysis of sources for dispersion, the right actuator for correcting dispersion is determined and a corresponding algorithm is developed.

Liu, C.; Minty, M.

2011-09-14T23:59:59.000Z

191

Modelling Heterogeneous Dispersion in Marginal Models for Longitudinal Proportional Data  

E-Print Network (OSTI)

the fitted curves for the pattern of dispersion profile over time across three different gas concentrationModelling Heterogeneous Dispersion in Marginal Models for Longitudinal Proportional Data Peter X proportional data assumes a constant dispersion para- meter. This assumption of dispersion homogeneity

Song, Peter X.

192

Non-streaming high-efficiency perforated semiconductor neutron detectors, methods of making same and measuring wand and detector modules utilizing same  

DOE Patents (OSTI)

Non-streaming high-efficiency perforated semiconductor neutron detectors, method of making same and measuring wands and detector modules utilizing same are disclosed. The detectors have improved mechanical structure, flattened angular detector responses, and reduced leakage current. A plurality of such detectors can be assembled into imaging arrays, and can be used for neutron radiography, remote neutron sensing, cold neutron imaging, SNM monitoring, and various other applications.

McGregor, Douglas S. (Riley, KS); Shultis, John K. (Manhattan, KS); Rice, Blake B. (Manhattan, KS); McNeil, Walter J. (Winnfield, KS); Solomon, Clell J. (Wichita, KS); Patterson, Eric L. (Manhattan, KS); Bellinger, Steven L. (Manhattan, KS)

2010-12-21T23:59:59.000Z

193

Ceramics containing dispersants for improved fracture toughness  

DOE Patents (OSTI)

The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRMO.sub.4, where R is a rare-earth element, B is Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.

Nevitt, Michael V. (Wheaton, IL); Aldred, Anthony T. (Wheaton, IL); Chan, Sai-Kit (Darien, IL)

1987-01-01T23:59:59.000Z

194

Performance Evaluation of Dense Gas Dispersion Models  

Science Conference Proceedings (OSTI)

This paper summarizes the results of a study to evaluate the performance of seven dense gas dispersion models using data from three field experiments. Two models (DEGADIS and SLAB) are in the public domain and the other five (AIRTOX, CHARM, FOCUS,...

Jawad S. Touma; William M. Cox; Harold Thistle; James G. Zapert

1995-03-01T23:59:59.000Z

195

The Mathematics of Atmospheric Dispersion Modeling  

Science Conference Proceedings (OSTI)

The Gaussian plume model is a standard approach for studying the transport of airborne contaminants due to turbulent diffusion and advection by the wind. This paper reviews the assumptions underlying the model, its derivation from the advection-diffusion ... Keywords: Gaussian plume solution, advection-diffusion equation, atmospheric dispersion, contaminant transport, inverse problem, linear least squares

John M. Stockie

2011-05-01T23:59:59.000Z

196

Dispersion-free radial transmission lines  

SciTech Connect

A dispersion-free radial transmission line ("DFRTL") preferably for linear accelerators, having two plane conductors each with a central hole, and an electromagnetically permeable material ("EPM") between the two conductors and surrounding a channel connecting the two holes. At least one of the material parameters of relative magnetic permeability, relative dielectric permittivity, and axial width of the EPM is varied as a function of radius, so that the characteristic impedance of the DFRTL is held substantially constant, and pulse transmission therethrough is substantially dispersion-free. Preferably, the EPM is divided into concentric radial sections, with the varied material parameters held constant in each respective section but stepwise varied between sections as a step function of the radius. The radial widths of the concentric sections are selected so that pulse traversal time across each section is the same, and the varied material parameters of the concentric sections are selected to minimize traversal error.

Caporaso, George J. (Livermore, CA); Nelson, Scott D. (Patterson, CA)

2011-04-12T23:59:59.000Z

197

Bianchi Type-II String Cosmological Models in Normal Gauge for Lyra's Manifold with Constant Deceleration Parameter  

E-Print Network (OSTI)

The present study deals with a spatially homogeneous and anisotropic Bianchi-II cosmological models representing massive strings in normal gauge for Lyra's manifold by applying the variation law for generalized Hubble's parameter that yields a constant value of deceleration parameter. The variation law for Hubble's parameter generates two types of solutions for the average scale factor, one is of power-law type and other is of the exponential form. Using these two forms, Einstein's modified field equations are solved separately that correspond to expanding singular and non-singular models of the universe respectively. The energy-momentum tensor for such string as formulated by Letelier (1983) is used to construct massive string cosmological models for which we assume that the expansion ($\\theta$) in the model is proportional to the component $\\sigma^{1}_{~1}$ of the shear tensor $\\sigma^{j}_{i}$. This condition leads to $A = (BC)^{m}$, where A, B and C are the metric coefficients and m is proportionality constant. Our models are in accelerating phase which is consistent to the recent observations. It has been found that the displacement vector $\\beta$ behaves like cosmological term $\\Lambda$ in the normal gauge treatment and the solutions are consistent with recent observations of SNe Ia. It has been found that massive strings dominate in the decelerating universe whereas strings dominate in the accelerating universe. Some physical and geometric behaviour of these models are also discussed.

Shilpi Agarwal; R. K. Pandey; Anirudh Pradhan

2010-10-07T23:59:59.000Z

198

Homogeneous Einstein Metrics on SU(n) Manifolds, Hoop Conjecture for Black Rings, and Ergoregions in Magnetised Black Hole Spacetimes  

E-Print Network (OSTI)

This Dissertation covers three aspects of General Relativity: inequivalent Einstein metrics on Lie Group Manifolds, proving the Hoop Conjecture for Black Rings, and investigating ergoregions in magnetised black hole spacetimes. A number of analytical and numerical techniques are employed to that end. It is known that every compact simple Lie Group admits a bi-invariant homogeneous Einstein metric. We use two ansatze to probe the existence of additional inequivalent Einstein metrics on the Lie Group SU (n). We provide an explicit construction of 2k + 1 and 2k inequivalent Einstein metrics on SU (2k) and SU (2k + 1) respectively. We prove the Hoop Conjecture for neutral and charged, singly and doubly rotating black rings. This allows one to determine whether a rotating mass distribution has an event horizon, that it is in fact a black ring. We investigate ergoregions in magnetised black hole spacetimes. We show that, in general, rotating charged black holes (Kerr-Newman) immersed in an external magnetic field have ergoregions that extend to infinity near the central axis unless we restrict the charge to q = amB and keep B below a maximal value. Additionally, we show that as B is increased from zero the ergoregion adjacent to the event horizon shrinks, vanishing altogether at a critical value, before reappearing and growing until it is no longer bounded as B becomes greater than the maximal value.

Mujtaba, Abid Hasan

2013-05-01T23:59:59.000Z

199

Development of a coal-fueled Internal Manifold Heat Exchanger (IMHEX reg sign ) molten carbonate fuel cell  

DOE Green Energy (OSTI)

The design of a CGMCFC electric generation plant that will provide a cost of eletricity (COE) which is lower than that of current electric generation technologies and which is competitive with other long-range electric generating systems is presented. This effort is based upon the Internal Manifold Heat Exchanger (IMHEX) technology as developed by the Institute of Gas Technology (IGT). The project was executed by selecting economic and performance objectives for alternative plant arrangements while considering process constraints identified during IMHEX fuel cell development activities at ICT. The four major subsystems of a coal-based MCFC power plant are coal gasification, gas purification, fuel cell power generation and the bottoming cycle. The design and method of operation of each subsystem can be varied, and, depending upon design choices, can have major impact on both the design of other subsystems and the resulting cost of electricity. The challenge of this project was to select, from a range of design parameters, those operating conditions that result in a preferred plant design. Computer modelling was thus used to perform sensitivity analyses of as many system variables as program resources and schedules would permit. In any systems analysis, it is imperative that the evaluation methodology be verifiable and comparable. The TAG Class I develops comparable (if imprecise) data on performance and costs for the alternative cases being studied. It identifies, from a range of options, those which merit more exacting scrutiny to be undertaken at the second level, TAG class II analysis.

Not Available

1991-09-01T23:59:59.000Z

200

GROA AIRBORNE RELEASE DISPERSION FACTOR CALCULATION  

Science Conference Proceedings (OSTI)

The purpose of this document is to calculate airborne release dispersion factors ({chi}/Q) for the surface and subsurface facilities at the Geological Repository Operations Area (GROA). The calculated {chi}/Q values may be used to estimate radiological consequences to workers for potential releases from normal operations and event sequences for License Application. The scope of this document is to provide estimates of {chi}/Q values at potential onsite receptors from facility releases, under normal operating conditions and event sequences.

J. Wang

2005-03-21T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Polymeric Dispersants: A Review of the Literature  

Science Conference Proceedings (OSTI)

This report presents a compilation of experimental work on the use of dispersants for preventing or ameliorating the fouling of high temperature surfaces in boilers or steam generators by corrosion products. Four types of experiments are discussed in this literature survey: thermal stability investigations, precipitant characterization, settling rate experiments, and plant, pilot-plant or boiler studies. The compilation was prepared as background material for completing the 50.59 analysis for the experim...

1999-11-05T23:59:59.000Z

202

Time Dispersive Spectrometer Using Digital Switching Means  

DOE Patents (OSTI)

Methods and apparatus are described for time dispersive spectroscopy. In particular, a modulated flow of ionized molecules of a sample are introduced into a drift region of an ion spectrometer. The ions are subsequently detected by an ion detector to produce an ion detection signal. The ion detection signal can be modulated to obtain a signal useful in assaying the chemical constituents of the sample.

Tarver, III, Edward E. (Livermore, CA); Siems, William F. (Spokane, WA)

2004-09-07T23:59:59.000Z

203

Estimating Plume Dispersion-A Comparison of Several Sigma Schemes  

Science Conference Proceedings (OSTI)

The lateral and vertical Gaussian plume dispersion parameters are estimated and compared with fieldtracer data collected at II sites. The dispersion parameter schemes used in this analysis include Cramer'sscheme, suggested for tall stack ...

John S. Irwin

1983-01-01T23:59:59.000Z

204

Update 6 to: A Dispersion Modeling Analysis of Downwash from...  

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

6 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant Modeling Baseload Units 3,4,5 Update 6 to: A Dispersion Modeling Analysis of Downwash from...

205

Update 4 to: A Dispersion Modeling Analysis of Downwash from...  

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

4 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 4 Emissions at Maximum and Minimum Loads Update 4 to: A Dispersion Modeling...

206

Update 3 to: A Dispersion Modeling Analysis of Downwash from...  

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

3 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together Update 3 to: A Dispersion Modeling Analysis of Downwash...

207

Update 2 to: A Dispersion Modeling Analysis of Downwash from...  

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

2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions at Maximum and Minimum Loads Update 2 to: A Dispersion Modeling...

208

Update 1 to: A Dispersion Modeling Analysis of Downwash from...  

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

1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions in a Cycling Mode Update 1 to: A Dispersion Modeling Analysis of...

209

Update 5 to: A Dispersion Modeling Analysis of Downwash from...  

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

5 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant: Modeling Cycling Units 1, 2 plus One Baseload Unit Update 5 to: A Dispersion Modeling...

210

Dryout droplet distribution and dispersed flow film boiling  

E-Print Network (OSTI)

Dispersed flow film boiling is characterized by liquid-phase droplets entrained in a continuous vapor-phase flow. In a previous work at MIT, a model of dispersed flow heat transfer was developed, called the Local Conditions ...

Hill, Wayne S.

1982-01-01T23:59:59.000Z

211

On the reduction of oxygen from dispersed media  

E-Print Network (OSTI)

The reduction of oxygen from an organic phase dispersed in a concentrated electrolyte is investigated. Dispersed organic phases are used to enhance oxygen transport in fermenters and artificial blood substitutes. This work ...

Roushdy, Omar H., 1977-

2007-01-01T23:59:59.000Z

212

Simulations of Nearshore Particle-Pair Dispersion in Southern California  

Science Conference Proceedings (OSTI)

Knowledge of horizontal relative dispersion in nearshore oceans is important for many applications including the transport and fate of pollutants and the dynamics of nearshore ecosystems. Two-particle dispersion statistics are calculated from ...

Leonel Romero; Yusuke Uchiyama; J. Carter Ohlmann; James C. McWilliams; David A. Siegel

2013-09-01T23:59:59.000Z

213

Mechanical Testing of Ferritic Oxide Dispersion Strengthened Steel ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Oxide dispersion strengthened (ODS) ferritic steels typically contain a fine dispersion of nanoscopic Y(Al, Ti) oxides. The presence of such ODS particles leads .... Behavior of Molybdenum · What Next in Gas Turbine Materials ...

214

On Lateral Dispersion Coefficients as Functions of Averaging Time  

Science Conference Proceedings (OSTI)

Plume dispersion coefficients are discussed in terms of single-particle and relative diffusion, and are investigated as functions of averaging time. To demonstrate the effects of averaging time on the relative importance of various dispersion ...

C. M. Sheih

1980-05-01T23:59:59.000Z

215

Dual-Doppler Lidar Measurements for Improving Dispersion Models  

Science Conference Proceedings (OSTI)

Dispersion of pollutants in the urban atmosphere is a subject that is presently under much investigation. In this paper the variables used in turbulent dispersion and plume rise schemes of the Met Office Nuclear Accident Model (NAME) are ...

Chris G. Collier; Fay Davies; Karen E. Bozier; Anthony R. Holt; Doug R. Middleton; Guy N. Pearson; Stephan Siemen; Dave V. Willetts; Graham J. G. Upton; Rob I. Young

2005-06-01T23:59:59.000Z

216

Hybrid Plume Dispersion Model (HPDM) Development and Evaluation  

Science Conference Proceedings (OSTI)

The Hybrid Plume Dispersion Model (HPDM) was developed for application to tall stack plumes dispersing over nearly flat terrain. Emphasis is on convective and high-wind conditions. The meteorological component is based on observational and ...

Steven R. Hanna; Robert J. Paine

1989-03-01T23:59:59.000Z

217

Geographic dispersion in teams : its history, experience, measurement, and change  

E-Print Network (OSTI)

This thesis begins with the simple argument that geographic dispersion has gone surprisingly unexamined despite its role as the domain-defining construct for geographically dispersed teams (a.k.a. "virtual teams"). The ...

O'Leary, Michael Boyer, 1969-

2002-01-01T23:59:59.000Z

218

Experimental Determination of Tracer Dispersivity in Fractures  

DOE Green Energy (OSTI)

Reinjection of waste hot water is commonly practiced in most geothermal fields, primarily as a means of disposal. Surface discharge of these waste waters is usually unacceptable due to the resulting thermal and chemical pollution. Although reinjection can help to main reservoir pressure and fluid volume, in some cases a decrease in reservoir productivity has been observed. This is caused by rapid flow of the reinjected water through fractures connecting the injector and producers. As a result, the water is not sufficiently heated by the reservoir rock, and a reduction in enthalpy of the produced fluids is seen. Tracer tests have proven to be valuable to reservoir engineers for the design of a successful reinjection program. By injecting a slug of tracer and studying the discharge of surrounding producing wells, an understanding of the fracture network within a reservoir can be provided. In order to quantify the results of a tracer test, a model that accurately describes the mechanisms of tracer transport is necessary. One such mechanism, dispersion, is like a smearing out of a tracer concentration due to the velocity gradients over the cross section of flow. If a dispersion coefficient can be determined from tracer test data, the fracture width can be estimated. The purpose of this project was to design and construct an apparatus to study the dispersion of a chemical tracer in flow through a fracture.

Gilardi, J.; Horns, R.N.

1985-01-22T23:59:59.000Z

219

DISPERSION AND DISSIPATION ERRORS OF TWO FULLY DISCRETE DISCONTINUOUS GALERKIN  

E-Print Network (OSTI)

-dimensional Euler equations in gas dynamics. There has been abundant study on the dispersion analysis of many nuDISPERSION AND DISSIPATION ERRORS OF TWO FULLY DISCRETE DISCONTINUOUS GALERKIN METHODS HE YANG, FENGYAN LI, AND JIANXIAN QIU Abstract. The dispersion and dissipation properties of numerical meth- ods

Li, Fengyan

220

Using oil-spill dispersants on the sea  

Science Conference Proceedings (OSTI)

The committee was charged to assess the state of knowledge and practice about the use of dispersants in responding to open-ocean oil-spills. The assessment will guide federal and local governments and industry in both the United States and Canada, in defining the role of dispersants in oil spill response and implementing the use of dispersants. Equally important is the charge to identify gaps in knowledge where research is especially needed. The committee was specifically asked to: determine the effectiveness of dispersants and identify the best techniques for their use; identify the possible impacts of dispersants and dispersed oil on marine and coastal environments; and provide guidance about when and where dispersants should or should not be used.

Not Available

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Solid electrolytes strengthened by metal dispersions  

DOE Patents (OSTI)

An improvement in solid electrolytes of advanced secondary batteries of the sodium-sulfur, sodium-halogen, and like combinations is achieved by providing said battery with a cermet electrolyte containing a metal dispersion ranging from 0.1 to 10.0 vol. % of a substantially nonreactive metal selected from the group consisting essentially of Pt, Cr, Fe, Co, Ni, Nb, their alloys, and their physical mixtures in the elemental or uncombined state, the remainder of said cermet being an ion-conductive ceramic material.

Lauf, R.J.; Morgan, C.S.

1981-10-05T23:59:59.000Z

222

Photon gas with hyperbolic dispersion relations  

E-Print Network (OSTI)

We investigate the density of states for a photon gas confined in a nonmagnetic metamaterial medium in which some components of the permittivity tensor are negative. We study the effect of the resulting hyperbolic dispersion relations on the black body spectral density. We show that for both of the possible wavevector space topologies, the spectral density vanishes at a certain frequency. We obtain the partition function and derive some thermodynamical quantities of the system. To leading order, the results resemble those of a one- or two-dimensional photon gas with an enhanced density of states.

Morteza Mohseni

2013-02-13T23:59:59.000Z

223

Photon gas with hyperbolic dispersion relations  

E-Print Network (OSTI)

We investigate the density of states for a photon gas confined in a nonmagnetic metamaterial medium in which some components of the permittivity tensor are negative. We study the effect of the resulting hyperbolic dispersion relations on the black body spectral density. We show that for both of the possible wavevector space topologies, the spectral density vanishes at a certain frequency. We obtain the partition function and derive some thermodynamical quantities of the system. To leading order, the results resemble those of a one- or two-dimensional photon gas with an enhanced density of states.

Mohseni, Morteza

2013-01-01T23:59:59.000Z

224

Average values and dispersion (in parentheses)  

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

Average values and dispersion (in parentheses) Average values and dispersion (in parentheses) Base-pair Parameters --------------------------------------------------------------------------------------- Shear Stretch Stagger Buckle Propeller Opening 3DNA A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.77) -11.79(4.14) 0.57(2.80) B 0.00(0.21) -0.15(0.12) 0.09(0.19) 0.53(6.74) -11.35(5.26) 0.63(3.05) CEHS A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.75) -11.82(4.14) 0.56(2.78) B 0.00(0.21) -0.14(0.12) 0.09(0.19) 0.53(6.73) -11.37(5.27) 0.62(3.03) CompDNA A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.12(7.70) -11.81(4.14) 0.56(2.79) B 0.00(0.21) -0.15(0.12) 0.09(0.19) 0.53(6.70) -11.37(5.26) 0.62(3.03) Curves A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.85) -11.76(4.12) 0.57(2.80)

225

Dispersion effects on membrane reactor performance  

SciTech Connect

A mathematical model has been developed that predicts the effects of design parameters, operating variables and physical properties on the performance of a membrane reactor with a permselective wall. The model consists of the full set of partial differential equations that describe the conservation of mass, momentum and chemical species, coupled with chemical kinetics and appropriate boundary conditions for the physical problem. The solution of this system is obtained by a finite-volume technique. The model was applied to study the dehydrogenation of cyclohexane. Two membrane types in tubular form were studied: a selective porous glass with low gas permeabilities and a porous alumina with very high gas permeabilities. It is concluded that gas separation and reactor performance are strongly influenced by dispersion effects only in the latter membrane reactor, while in both cases radial concentration profiles do not correspond to those obtained with plug flow. Therefore, simulations of this type of problem should be based on complex dispersion models rather than the existing ideal plug-flow ones.

Koukou, M.K.; Papayannakos, N.; Markatos, N.C. [National Technical Univ. of Athens (Greece). Dept. of Chemical Engineering

1996-09-01T23:59:59.000Z

226

Evaluation of machining dispersions for turning process  

E-Print Network (OSTI)

In this article we propose to extend the model of simulation of dispersions in turning based on the geometrical specifications. Our study is articulated around two trends of development: the first trend relates to the geometrical model. The geometrical model suggested must allow a follow-up of the geometry of the part during the simulation of machining. It is thus a question of carrying out a systematic treatment of the whole dimensioning and tolerancing process while being based on the principles of the \\DeltaL method. We also planned to integrate this type of specification in the model of simulation of machining suggested. It is more generally a question of extending the traditional model for better taking into account the multi axis specification of coaxiality and perpendicularity on the turned workpieces. The second trend of our study relates to the widening of the field of application of the model. We propose to extend the field of application of the model by taking into account the modifications of several parameters of the manufacturing process plans, likely to involve variations of dispersions.

Arnaud Lefebvre; Valery Wolff

2008-03-03T23:59:59.000Z

227

Spatial Dispersion and Performance Evaluation of  

E-Print Network (OSTI)

Channel capacity of a MIMO system is dependent not only on the signal-to-noise ratio (SNR) but also on spatial correlation among antenna elements. Therefore, the system design must rely on good propagation predictions. By using a ray tracing simulator, which considers reflections, penetrations and diffractions in 3-D space, we predict channel properties and evaluate capacity of 4 4 indoor MIMO channels for both line-of-sight (LOS) and non-line-of-sight (NLOS) cases. Before extensive simulations, the predictions of the simulator are verified by comparing results of wideband channel measurement and simulation. The comparison shows that path loss and RMS delay spread can be well predicted by simulation. Based on simulated results, we investigate the spatial dispersion of the channel and its impact on channel capacity. Data analysis shows that spatial dispersion can be better characterized by using both the azimuth spread and elevation spread than by only one of them. Moreover, the reduced capacity in the NLOS region due to lower signalto -noise can be partially compensated by an increase in capacity due to lower signal correlation.

Indoor Mimo Channels; Haibing Yang; Matti H. A. J. Herben

2004-01-01T23:59:59.000Z

228

Light field appearance manifolds  

E-Print Network (OSTI)

Statistical shape and texture appearance models are powerful image representations, but previously had been restricted to 2D or 3D shapes with smooth surfaces and lambertian reflectance. In this thesis we present a novel ...

Christoudias, Chris Mario, 1980-

2004-01-01T23:59:59.000Z

229

The Coupled Manifold  

Science Conference Proceedings (OSTI)

A new method is presented to detect the portion of variability connected between two climatic fields. The method is a realization of the Procrustes problem, and it is a generalization of methods for analysis of variance such as the singular value ...

A. Navarra; J. Tribbia

2005-02-01T23:59:59.000Z

230

Atmospheric Dispersion Modeling in Safety Analyses; GENII  

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

Workshop to Discuss Issues Regarding Deposition Workshop to Discuss Issues Regarding Deposition Velocity June 5-6, 2012 Jeremy Rishel Bruce Napier Atmospheric Dispersion Modeling in Safety Analyses: GENII Today's Presentation.... Will provide a high-level overview of the GENII codes. Will cover basic aspects of GENII's acute atmospheric transport model. Will review the GENII deposition model that is used to estimate the deposition velocity used in plume depletion. 2 GENII Development History 1988 - GENII V1 released ICRP-26/30/48 dosimetry 1990 - GENII V1.485 stabilized Current DOE Toolbox Version 1992 - GENII-S stochastic version 2004 - GENII V2 ICRP-72 age-dependent dosimetry Federal Guidance Report 13 risk factors

231

Method for dispersing catalyst onto particulate material  

DOE Patents (OSTI)

A method for dispersing finely divided catalyst precursors onto the surface of coal or other particulate material includes the steps of forming a wet paste mixture of the particulate material and a liquid solution containing a dissolved transition metal salt, for instance a solution of ferric nitrate. The wet paste mixture is in a state of incipient wetness with all of this solution adsorbed onto the surfaces of the particulate material without the presence of free moisture. On adding a precipitating agent such as ammonia, a catalyst precursor such as hydrated iron oxide is deposited on the surfaces of the coal. The catalyst is activated by converting it to the sulfide form for the hydrogenation or direct liquefaction of the coal.

Utz, Bruce R. (Pittsburgh, PA); Cugini, Anthony V. (Pittsburgh, PA)

1992-01-01T23:59:59.000Z

232

Inflationary cosmology with nonlinear dispersion relations  

E-Print Network (OSTI)

We present a technique, {\\em the uniform asymptotic approximation}, to construct accurate analytical solutions of the linear perturbations of inflation after quantum effects of the early universe are taken into account, for which the dispersion relations generically become nonlinear. We construct explicitly the error bounds associated with the approximations and then study them in detail. With the understanding of the errors and the proper choice of the Liouville transformations of the differential equations of the perturbations, we show that the analytical solutions describe the exact evolution of the linear perturbations extremely well even only in the first-order approximations. As an application of the approximate analytical solutions, we calculate the power spectra and indices of scalar and tensor perturbations in the slow-roll inflation, and find that the amplitudes of the power spectra get modified due to the quantum effects, while the power spectrum indices remain the same as in the linear case.

Tao Zhu; Anzhong Wang; Gerald Cleaver; Klaus Kirsten; Qin Sheng

2013-08-26T23:59:59.000Z

233

Atmospheric Dispersion Analysis using MACCS2  

Science Conference Proceedings (OSTI)

The Nuclear Regulatory Commission (NRC) Regulatory Guide 1.145 requires an evaluation of the offsite atmospheric dispersion coefficient, {Chi}/Q, as a part of the acceptance criteria in the accident analysis. In it, it requires in sequence computations of (1) the overall site 95th percentile {Chi}/Q, (2) the maximum of the sixteen sector 99.5th percentile {Chi}/Q, and (3) comparison and selection of the worst of the two values for reporting in the safety analysis report (SAR). In all cases, the site-specific meteorology and sector-specific site boundary distances are employed in the evaluation. There are sixteen 22.5-sectors, the nearest site boundary of which is determined within the 45-arc centered on each of the sixteen compass directions.

Glaser, R; Yang, J M

2004-02-02T23:59:59.000Z

234

Process for producing dispersed particulate composite materials  

DOE Patents (OSTI)

This invention is directed to a process for forming noninterwoven dispersed particulate composite products. In one case a composite multi-layer film product comprises a substantially noninterwoven multi-layer film having a plurality of discrete layers. This noninterwoven film comprises at least one discrete layer of a first material and at least one discrete layer of a second material. In another case the first and second materials are blended together with each other. In either case, the first material comprises a metalloid and the second material a metal compound. At least one component of a first material in one discrete layer undergoes a solid state displacement reaction with at least one component of a second material thereby producing the requisite noninterwoven composite film product. Preferably, the first material comprises silicon, the second material comprises Mo.sub.2 C, the third material comprises SiC and the fourth material comprises MoSi.sub.2.

Henager, Jr., Charles H. (Richland, WA); Hirth, John P. (Viola, ID)

1995-01-01T23:59:59.000Z

235

Dispersive waves generated by an underwater landslide  

E-Print Network (OSTI)

In this work we study the generation of water waves by an underwater sliding mass. The wave dynamics are assumed to fell into the shallow water regime. However, the characteristic wavelength of the free surface motion is generally smaller than in geophysically generated tsunamis. Thus, dispersive effects need to be taken into account. In the present study the fluid layer is modeled by the Peregrine system modified appropriately and written in conservative variables. The landslide is assumed to be a quasi-deformable body of mass whose trajectory is completely determined by its barycenter motion. A differential equation modeling the landslide motion along a curvilinear bottom is obtained by projecting all the forces acting on the submerged body onto a local moving coordinate system. One of the main novelties of our approach consists in taking into account curvature effects of the sea bed.

Dutykh, Denys; Beysel, Sonya; Shokina, Nina; Khakimzyanov, Gayaz

2011-01-01T23:59:59.000Z

236

Hyper dispersion pulse compressor for chirped pulse amplification systems  

Science Conference Proceedings (OSTI)

A grating pulse compressor configuration is introduced for increasing the optical dispersion for a given footprint and to make practical the application for chirped pulse amplification (CPA) to quasi-narrow bandwidth materials, such as Nd:YAG. The grating configurations often use cascaded pairs of gratings to increase angular dispersion an order of magnitude or more. Increased angular dispersion allows for decreased grating separation and a smaller compressor footprint.

Barty, Christopher P. J. (Hayward, CA)

2011-11-29T23:59:59.000Z

237

Finite volume schemes for dispersive wave propagation and runup  

E-Print Network (OSTI)

Finite volume schemes are commonly used to construct approximate solutions to conservation laws. In this study we extend the framework of the finite volume methods to dispersive water wave models, in particular to Boussinesq type systems. We focus mainly on the application of the method to bidirectional nonlinear, dispersive wave propagation in one space dimension. Special emphasis is given to important nonlinear phenomena such as solitary waves interactions, dispersive shock wave formation and the runup of breaking and non-breaking long waves.

Dutykh, Denys; Mitsotakis, Dimitrios

2010-01-01T23:59:59.000Z

238

Definition: Dispersed Load By Substations | Open Energy Information  

Open Energy Info (EERE)

By Substations Jump to: navigation, search Dictionary.png Dispersed Load By Substations Substation load information configured to represent a system for power flow or system...

239

Highly Dispersed Metal Catalyst - Home - Energy Innovation Portal  

Method for full dispersion of active metals into a high surface area of support to promote efficiency Scientists at the Savannah River National Laboratory have ...

240

Effect of Oxide Dispersion Strengthening on Spark Plasma Sintering ...  

Science Conference Proceedings (OSTI)

Studies on densification behavior revealed that steel powders with dispersed ceramic ... Synthesis of TiN Nanorods by Thermal Decomposition of Solid/Gas ...

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Tensile Properties of Fine Grain MA956 Oxide Dispersion ...  

Science Conference Proceedings (OSTI)

Presentation Title, Tensile Properties of Fine Grain MA956 Oxide Dispersion ... Weld Overlay Claddings by Gas-metal-arc Welding Process for Extending Plant ...

242

Structure and Properties of Oxide Dispersion Strengthened 18Cr Steel  

Science Conference Proceedings (OSTI)

Abstract Scope, Oxide dispersion strengthened (ODS) steels are potential materials for application in nuclear reactors and gas turbines due to improved high ...

243

Dispersion of Ag Nanoparticles onto Porous Aluminum Hydroxide ...  

Science Conference Proceedings (OSTI)

And the optical property of the fabricated Ag nanoparticles dispersed ... Properties and Characterization of Nano-Structured Metal Oxides Used for Gas Sensor ...

244

Characterization of gas dispersion in industrial flotation machines.  

E-Print Network (OSTI)

??The flotation process is designed to collect hydrophobic particles by attachment on to bubbles dispersed in slurry. The effectiveness of the flotation process depends on… (more)

Doucet, Jason S.

2006-01-01T23:59:59.000Z

245

Computation of pollutant dispersion during an airplane take-off  

Science Conference Proceedings (OSTI)

The fact that airports contribute to the downgrading of the air quality of the nearby cities arouses the interest of examining the planes' emissions and dispersion in detail. Hence this study focuses on a single take-off and investigates the pollutant ... Keywords: Airplane take-off, Computational fluid dynamics, NOx, Optical pollution measurement, Pollutant dispersion

N. Koutsourakis; J. G. Bartzis; A. Venetsanos; S. Rafailidis

2006-04-01T23:59:59.000Z

246

Simultaneous global coupling and vertical dispersion correction in RHIC  

SciTech Connect

Residual vertical dispersion on the order of +/-0.2 m (peak to peak) has been measured at store energies for both polarized protons and heavy ion beams in RHIC. The hypothesis is that this may have impact on the polarization transmission efficiency during the energy ramp, the polarization lifetime at store and, for heavy ions, the dynamic aperture. An algorithm to correct global coupling and dispersion simultaneously using existing skew quadrupoles was developed. Measured coupling and dispersion functions acquired before and after correction are presented.

Liu C.; Luo, Y.; Marusic, A.; Minty, M.

2012-05-20T23:59:59.000Z

247

Catch-Disperse-Release Readout for Superconducting Qubits  

E-Print Network (OSTI)

We analyze a single-shot readout for superconducting qubits via the controlled catch, dispersion, and release of a microwave field. A tunable coupler is used to decouple the microwave resonator from the transmission line during the dispersive qubit-resonator interaction, thus circumventing damping from the Purcell effect. We show that if the qubit frequency tuning is sufficiently adiabatic, a fast high-fidelity qubit readout is possible, even in the strongly nonlinear dispersive regime. Interestingly, the Jaynes-Cummings nonlinearity leads to the quadrature squeezing of the resonator field below the standard quantum limit, resulting in a significant decrease of the measurement error.

Eyob A. Sete; Andrei Galiautdinov; Eric Mlinar; John M. Martinis; Alexander N. Korotkov

2013-02-27T23:59:59.000Z

248

OXIDE DISPERSION-STRENGTHENED HEAT EXCHANGER TUBING  

Science Conference Proceedings (OSTI)

Oxide dispersion strengthened (ODS) alloys (e.g. the INCOLOY{reg_sign} MA956 alloy) are known for their excellent high temperature properties and are prime candidate materials for the construction of very high temperature heat exchangers that will be used in Vision 21 power plants. The main limitation of these materials is their poor weldability. Commercially available ODS tubing also tends to exhibit relatively poor circumferential creep strength due to current processing practices resulting in a fine grain size in the transverse direction. Thus far, these two characteristics of the ODS tubing have restricted its use to mostly non-pressure containing applications. The objectives of this program are to develop: (a) an MA956 tube with sufficient circumferential creep strength for long term use as heat exchanger tubing for very high temperatures; (b) a welding technique(s) for producing adequate joints between an MA956 tube and an MA956 tube, and an MA956 tube and an INCONEL 601 tube; (c) the bending strain limits, below which recrystallization will not occur in a MA956 tube during normal operation; and (d) the high temperature corrosion limits for the MA956 alloy with respect to working-fluid side and fireside environments. Also, this program seeks to generate data for use by heat exchanger designers and the ASME Boiler and Pressure Vessel Code, and perform an analysis of the mechanical property, tube bending, and corrosion data in order to determine the implications on the design of a very high temperature heat exchanger (T>1093 C/2000 F). After one year, work is currently being conducted on increasing the circumferential strength of a MA956 tube, developing joining techniques for this material, determining the tube bending strain limits, and establishing the high temperature corrosion parameters for the MA956 alloy in environments expected to be present in Vision 21 power plants. Work in these areas will is continuing into the next fiscal year, with success anticipated to produce innovative developments that will allow the reliable use of ODS alloys for heat exchanger tubing, as well as a variety of applications previously not possible with metallic materials.

Harper, Mark A.

2001-11-06T23:59:59.000Z

249

A CFD Model for Simulating Urban Flow and Dispersion  

Science Conference Proceedings (OSTI)

A three-dimensional computational fluid dynamics (CFD) model is developed to simulate urban flow and dispersion, to understand fluid dynamical processes therein, and to provide practical solutions to some emerging problems of urban air pollution. ...

Jong-Jin Baik; Jae-Jin Kim; Harindra J. S. Fernando

2003-11-01T23:59:59.000Z

250

Agents of seed dispersal : animal--zoochary / Wind--anemonochory  

E-Print Network (OSTI)

Agents of seed dispersal is a project designed to address the increase of environmental degradation, which occurs as a result of the perpetual spread of the asphalt and concrete of the contemporary urban situation. Agents ...

Lysakowski, Lukasz Kamil, 1974-

2004-01-01T23:59:59.000Z

251

Forced-convection, dispersed-flow film boiling  

E-Print Network (OSTI)

This report presents the latest results of an investigation of the characteristics of dispersed flow film boiling. Heat transfer data are presented for vertical upflow of nitrogen in an electrically heated tube, 0.4 in. ...

Hynek, Scott Josef

1969-01-01T23:59:59.000Z

252

Volcanic Ash Forecast Transport And Dispersion (VAFTAD) Model  

Science Conference Proceedings (OSTI)

The National Oceanic and Atmospheric Administration (NOAA) Air Resources Laboratory (ARL) has developed a Volcanic Ash Forecast Transport And Dispersion (VAFTAD) model for emergency response use focusing on hazards to aircraft flight operations. ...

Jerome L. Heffter; Barbara J. B. Stunder

1993-12-01T23:59:59.000Z

253

Dispersion relation of electromagnetic ion cyclotron waves using Cluster observations  

E-Print Network (OSTI)

Multi-point wave observations on Cluster spacecraft are used to infer the dispersion relation of electromagnetic ion cyclotron (EMIC) waves. In this study we use a phase differencing method and observations from STAFF and ...

Pakhotin, I. P.

254

Statistical Performance of Several Mesoscale Atmospheric Dispersion Models  

Science Conference Proceedings (OSTI)

Seventeen mesoscale dispersion models were statistically evaluated with data from krypton-85 emissions from the Savannah River Plant, Aiken, SC. Widely accepted statistical parameters were used for the statistical evaluation. The models were able ...

A. H. Weber; M. R. Buckner; J. H. Weber

1982-11-01T23:59:59.000Z

255

Urban Dispersion Modeling: Comparison with Single-Building Measurements  

Science Conference Proceedings (OSTI)

Two models have been developed to predict airflow and dispersion in urban environments. The first model, the Realistic Urban Spread and Transport of Intrusive Contaminants (RUSTIC) model, is a fast-running urban airflow code that rapidly ...

Steve R. Diehl; Donald A. Burrows; Eric A. Hendricks; Robert Keith

2007-12-01T23:59:59.000Z

256

Dispersion of Marked Fluid Elements in a Turbulent Ekman Layer  

Science Conference Proceedings (OSTI)

A stochastic model is derived for studying shear-dispersion in a horizontally homogeneous, turbulent Ekman layer that is evolving in time. It is based on a one-dimensional model including an advanced turbulence closure (k = ?) model, which yields ...

Lars-Arne Rahm; Urban Svensson

1986-12-01T23:59:59.000Z

257

Relative Dispersion of Ice Crystals in Seeded Cumuli  

Science Conference Proceedings (OSTI)

Relative dispersion of ice crystals was measured in 30 seeded cumulus clouds. A quasi-instantaneous, vertical area source of ice was generated by releasing dry-ice pellets from an airplane. The ice concentration distribution and relative ...

Jeffrey C. Weil; R. Paul Lawson; Alfred R. Rodi

1993-06-01T23:59:59.000Z

258

Dispersion of Small Suspended Particles in a Wave Boundary Layer  

Science Conference Proceedings (OSTI)

The dispersion of heavy suspensions in a wave boundary layer over a nonerodible bed is examined theoretically. Focusing attention on the horizontal variation of the ambient wave pattern, an effective convection-diffusion equation is derived by ...

Chiang C. Mei; Chimin Chian

1994-12-01T23:59:59.000Z

259

Plasmon Dispersion in Two-dimensional Charge-Sheets.  

E-Print Network (OSTI)

??The dispersion of sheet plasmons in two-dimensional electron systems was investigated in an in-situ ultra high vacuum environment by angle-resolved high-resolution electron-energy-loss spectroscopy (HREELS). In… (more)

Liu, Yu

2009-01-01T23:59:59.000Z

260

A high-dispersion molecular gas component in nearby galaxies  

E-Print Network (OSTI)

We present a comprehensive study of the velocity dispersion of the atomic (HI) and molecular (H2) gas components in the disks (R gas) and HERACLES (molecular gas) surveys. To obtain reliable measurements of the velocity dispersion, we stack regions several kilo-parsecs in size, after accounting for intrinsic velocity shifts due to galactic rotation and large-scale motions. We stack using various parameters: the galacto-centric distance, star formation rate surface density, HI surface density, H2 surface density, and total gas surface density. We fit single Gaussian components to the stacked spectra and measure median velocity dispersions for HI of 11.9 +/- 3.1 km/s and for H2 of 12.0 +/- 3.9 km/s. The CO velocity dispersions are thus, surprisingly, very similar to the corresponding ones of HI, with an average ratio of sigma(HI)/sigma(CO) = 1.0 +/- 0.2 i...

Caldu-Primo, Anahi; Walter, Fabian; Leroy, Adam; Sandstrom, Karin; de Blok, W J G; Ianjamasimanana, Roger; Mogotsi, K M

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Horizontal Dispersion Parameters for Long-Range Transport Modeling  

Science Conference Proceedings (OSTI)

A computer model using actual meteorological data is developed to simulate the effects of wind shear on an instantaneous pollutant puff. The effect of wind shear on dispersion is obtained by subdividing, during the nocturnal phase, the previous ...

Roland R. Draxler; Albion D. Taylor

1982-03-01T23:59:59.000Z

262

Measurements of Lagrangian Atmospheric Dispersion Statistics over Open Water  

Science Conference Proceedings (OSTI)

Atmospheric dispersion statistics in the Lagrangian frame have been evaluated over open water by using a double-theodolite system to track neutrally buoyant balloons released a few kilometers off-shore during onshore winds. Analysis of the ...

C. M. Sheih; P. Frenzen; R. L. Hart

1980-05-01T23:59:59.000Z

263

Atmospheric Dispersion and Tracer Ventilation in a Deep Mountain Valley  

Science Conference Proceedings (OSTI)

During September and October 1984, a major meteorological and tracer study was conducted in Colorado's Brush Creek valley. The characteristics of atmospheric dispersion during the nighttime and morning transition periods are discussed in this ...

K. Jerry Allwine

1993-06-01T23:59:59.000Z

264

A Practical Model for the Dispersion of Skewed Puffs  

Science Conference Proceedings (OSTI)

A practical puff model based on the Monin-Obukhov similarity theory is presented. The model uses approximate solutions for the dispersion of a cloud of passive contaminant released from instantaneous sources and where particular importance is ...

T. Tirabassi; U. Rizza

1995-04-01T23:59:59.000Z

265

Experimental determination of the effective Taylor dispersivity in a fracture  

DOE Green Energy (OSTI)

The applicability and accuracy of the approximation for Taylor Dispersion was experimentally determined for the diffusion of a chemical tracer in flow through a fracture. 12 refs., 16 figs., 10 tabs. (ACR)

Gilardi, J.R.

1984-06-01T23:59:59.000Z

266

A Parameterization of Vertical Dispersion of Ground-Level Releases  

Science Conference Proceedings (OSTI)

The authors propose a simple parameterization for estimating vertical dispersion in the surface boundary layer. It improves upon methods proposed earlier (e.g., by van Ulden, Briggs, and Pasquill and Smith) in that it is based on simulation ...

Shuming Du; Akula Venkatram

1997-08-01T23:59:59.000Z

267

Relativistic plasma dispersion functions: Series, integrals, and approximations  

SciTech Connect

A number of results are presented involving the plasma dispersion functions appropriate to waves in weakly relativistic, magnetized, thermal plasmas. These results include generating functions, series, integral forms and interrelations, and several useful approximations.

Robinson, P.A.

1987-05-01T23:59:59.000Z

268

Modification of an Operational Dispersion Model for Urban Applications  

Science Conference Proceedings (OSTI)

An operational multisource, multireceptor Gaussian dispersion model, the Danish regulatory model Operationelle Meteorologiske Luftkvalitetsmodeller (OML) has been modified for applications in urban environments. A so-called roughness sublayer has ...

Peter de Haan; Mathias W. Rotach; Maja Werfeli

2001-05-01T23:59:59.000Z

269

RELIABILITY OF WIND POWER FROM DISPERSED SITES: A PRELIMINARY ASSESSMENT  

E-Print Network (OSTI)

ON METHODOLOGY: FROM WIND POWER FREQUENCY TO LOSS-OF-LOADJ.P. , "Some Aspects of Wind Power Statistics, " J. of Appl.S£CTION Reliability of Wind Power From Dispersed Sites: A Pr

Kahn, E.

2011-01-01T23:59:59.000Z

270

Atmospheric Dispersion Model Validation in Low Wind Conditions  

DOE Green Energy (OSTI)

and SCIPUFF models and under-prediction bias by the ALOHA model. The experiment parameters were for near field dispersion (less than 100 meters) in low wind speed conditions (less than 2 meters per second).

Patrick Sawyer

2007-11-01T23:59:59.000Z

271

Investigation of Flow, Turbulence, and Dispersion within Built Environments  

E-Print Network (OSTI)

Properties of the wind field within the Oklahoma City ParkProperties of the wind field within the Oklahoma City Parkwinds, turbulence, and dispersion in built-up downtown areas of Oklahoma

Pan, Hansheng

2011-01-01T23:59:59.000Z

272

Power-law Spatial Dispersion from Fractional Liouville Equation  

E-Print Network (OSTI)

A microscopic model in the framework of fractional kinetics to describe spatial dispersion of power-law type is suggested. The Liouville equation with the Caputo fractional derivatives is used to obtain the power-law dependence of the absolute permittivity on the wave vector. The fractional differential equations for electrostatic potential in the media with power-law spatial dispersion are derived. The particular solutions of these equations for the electric potential of point charge in this media are considered.

Vasily E. Tarasov

2013-07-18T23:59:59.000Z

273

Finite volume methods for unidirectional dispersive wave models  

E-Print Network (OSTI)

We extend the framework of the finite volume method to dispersive unidirectional water wave propagation in one space dimension. In particular we consider a KdV-BBM type equation. Explicit and IMEX Runge-Kutta type methods are used for time discretizations. The fully discrete schemes are validated by direct comparisons to analytic solutions. Invariants conservation properties are also studied. Main applications include important nonlinear phenomena such as dispersive shock wave formation, solitary waves and their various interactions.

Dutykh, Denys; Mitsotakis, Dimitrios

2010-01-01T23:59:59.000Z

274

Low Cost Fabrication of Oxide Dispersion Strengthened Materials  

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

Low Cost Fabrication of Oxide Dispersion Low Cost Fabrication of Oxide Dispersion Strengthened Materials Background To obtain significant increases in the efficiency of coal fired power plants, steam pressure and temperature must be increased beyond current technology to advanced ultra-supercritical (A-USC) conditions -temperatures and pressures up to 760 degrees Celsius (°C) and 35 megapascals (MPa). The upper bounds of operating pressure and temperature are limited by the properties of the current set

275

Kinetic dispersion of Langmuir waves. I. The Langmuir decay instability  

SciTech Connect

We derive a fully kinetic, three-dimensional dispersion relation for Langmuir waves with a focus on the Langmuir decay instability (LDI). The kinetic dispersion is compared to the standard fluid dispersion found with an equation of state (EOS) closure. The EOS closure fails to capture the intricacies of the nonlinear pressure when high frequency electron plasma waves (EPWs) couple to low frequency ion acoustic waves (IAWs). In particular, we find discrepancies in the k{lambda}{sub d} scaling of the LDI growth rate, where k is the wavenumber of the incident EPW and {lambda}{sub d} is the Debye length. As a result, the kinetic dispersion relation for LDI results in instability thresholds that can be in excess of twice those predicted by the fluid theory. Both the fluid and kinetic dispersion relations predict a nonlinear frequency shift due to the beating of the pump and scattered EPWs, but again the k{lambda}{sub d} scaling of these frequency shifts differ. In addition, the kinetic dispersion predicts a nonlinear reduction in the IAW damping from the three-wave interaction.

Palastro, J. P.; Williams, E. A.; Hinkel, D. E.; Divol, L.; Strozzi, D. J. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

2009-09-15T23:59:59.000Z

276

Atmospheric Dispersion of Wheat Rust Spores: A New Theoretical Framework to Interpret Field Data and Estimate Downwind Dispersion  

Science Conference Proceedings (OSTI)

Theoretical predictions for dispersion of heavy particles above an area source are used to formulate a new framework to interpret measurements of spore concentration above an infected field. Experimental measurements of mean spore concentration ...

Marcelo Chamecki; Nicholas S. Dufault; Scott A. Isard

2012-03-01T23:59:59.000Z

277

Method of Manufacturing Micro-Disperse Particles of Sodium Borohydride  

DOE Patents (OSTI)

A compact solid source of hydrogen gas, where the gas is generated by contacting water with micro-disperse particles of sodium borohydride in the presence of a catalyst, such as cobalt or ruthenium. The micro-disperse particles can have a substantially uniform diameter of 1-10 microns, and preferably about 3-5 microns. Ruthenium or cobalt catalytic nanoparticles can be incorporated in the micro-disperse particles of sodium borohydride, which allows a rapid and complete reaction to occur without the problems associated with caking and scaling of the surface by the reactant product sodium metaborate. A closed loop water management system can be used to recycle wastewater from a PEM fuel cell to supply water for reacting with the micro-disperse particles of sodium borohydride in a compact hydrogen gas generator. Capillary forces can wick water from a water reservoir into a packed bed of micro-disperse fuel particles, eliminating the need for using an active pump.

Kravitz, Stanley H. (Placitas, NM); Hecht, Andrew M. (Sandia Park, NM); Sylwester. Alan P. (Albuquerque, NM); Bell, Nelson S. (Albuquerque, NM)

2008-09-23T23:59:59.000Z

278

System and method for detection of dispersed broadband signals  

DOE Patents (OSTI)

A system and method for detecting the presence of dispersed broadband signals in real time are disclosed. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos[l brace]2[phi](t)[r brace]. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase [phi](t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of [phi][prime](t). 10 figs.

Qian, S.; Dunham, M.E.

1999-06-08T23:59:59.000Z

279

GIS and plume dispersion modeling for population exposure assessment  

E-Print Network (OSTI)

The use of Pollutant Plume Dispersion Models is widespread in the evaluation of point sources of air pollution. These models provide valuable insight into the concentration and dispersion of hazardous materials throughout the atmosphere. Traditional methods of dispersion modeling for the permitting of new sources and the monitoring of existing sources have allowed much room for error in terms of the effect of the pollutants on nearby populations (Hardikar, 1995). The capabilities of GIS technology offer an improved method of conducting air quality modeling for permitting, remediation studies, and environmental monitoring. GIS has the ability to develop and manage a comprehensive database of model output, map layers, and demographic data that can prove extremely valuable in the modeling process. This data can serve to extend the capabilities of air pollution dispersion modeling from mere estimation of concentrations to comprehensive exposure assessment of neighboring populations (Lowry, et al. 1995, Maslia, et al. 1994). A study of the Monticello power plant in northeast Texas was conducted using the SCREEN3 mathematical plume dispersion model, US Census Bureau demographic data, and a GIS to examine the effects of the plant output on the people living in the seven county area surrounding the plant.

Archer, Jeffrey Keith

1998-01-01T23:59:59.000Z

280

Phytologia (December 2010) 92(3)424 SEED DISPERSAL IN JUNIPERUS: A REVIEW  

E-Print Network (OSTI)

torquatus wintering population in seed dispersal of the endangered endemic Juniperus cedr environment. Acta

Adams, Robert P.

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Dispersion a ecting the VLTI and 10 micron interferometry Je rey Meisner and Rudolf Le Poole  

E-Print Network (OSTI)

in travel through a gas as equal to the vacuum delay L=c due to the distance travelled (which is dispersion order dispersion within their de#12;nition of dispersion. #12; #15; Gas at 1mm Hg at 0 o C: D = L #1Dispersion a#11;ecting the VLTI and 10 micron interferometry using MIDI Je#11;rey Meisner

Meisner, Jeff

282

The Colloidal State A colloidal dispersion comprises a collection of small particles, droplets, or bubbles  

E-Print Network (OSTI)

. See Section 11.3.2. 1.2.2 Foams A foam is a colloidal dispersion in which a gas is dispersed and everyday life. Solid foams, dispersions of gas in a solid, are not, in general, covered in this book. A two1 1.1 The Colloidal State A colloidal dispersion comprises a collection of small particles

Schramm, Laurier L.

283

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008  

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

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008

284

Comparison of Average Transport and Dispersion Among a Gaussian, a  

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

Comparison of Average Transport and Dispersion Among a Gaussian, a Comparison of Average Transport and Dispersion Among a Gaussian, a Two-Dimensional, and a Three-Dimensional Model Comparison of Average Transport and Dispersion Among a Gaussian, a Two-Dimensional, and a Three-Dimensional Model The Nuclear Regulatory Commission's (NRC's) code for predicting off-site consequences, MACCS2 (Chanin, et al. 1998) (MELCOR Accident Consequence Code System, Version 2), uses a simplified model for atmospheric transport and d ispersion (ATD), that is, a straight-line Gaussian model. The MACCS2 calculations are used by the NRC for planning purposes, for cost-benefit analyses, and in level-3 probabilistic risk analyses (PRAs). The MACCS2 ATD model has been criticized as being overly simplistic, even for its purposes. The justification for its use has been

285

Extended, Continuous Pt Nanostructures in Thick, Dispersed Electrodes  

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

Bryan Pivovar (PI) Bryan Pivovar (PI) National Renewable Energy Laboratory Sept 30, 2009 Extended, Continuous Pt Nanostructures in Thick, Dispersed Electrodes This presentation does not contain any proprietary, confidential, or otherwise restricted information Objectives To assist the DOE Fuel Cell Technologies (FCT) Program in meeting cost, durability, and performance targets in the areas of Electrocatalysts and MEAs. Approach: Novel Synthesis and Electrode Studies Pt nanotubes (UC-R) Pt coated carbon nanotubes Synthesis of novel catalysts based on extended surfaces due to 3M's demonstrated improvements in specific activity and durability using similar systems. Electrode architecture design, based on novel catalyst structures that allow thick (~10 µm), dispersed electrodes to

286

Price Dispersion on the Internet: Good Firms and Bad Firms  

E-Print Network (OSTI)

Abstract. Internet firms charge a wide range of prices for homogeneous products, and high-priced firms remain high-priced and low-priced firms remain low-priced over long periods. One explanation is that high-price firms are charging a premium for superior service. An alternative, price-dispersion explanation is that firms vary the prices for informed and uniformed consumers (Salop and Stiglitz, 1977) or serious shoppers and others (Wilde and Schwartz, 1979). The pricing pattern for a digital camera and a flatbed scanner is consistent with the price-dispersion model and inconsistent with the service-premium hypothesis. I.

Kathy Baylis; Jeffrey M. Perloff

2002-01-01T23:59:59.000Z

287

Thermodynamics of a photon gas and deformed dispersion relations  

E-Print Network (OSTI)

We resort to the methods of statistical mechanics in order to determine the effects that a deformed dispersion relation has upon the thermodynamics of a photon gas. The ensuing modifications to the density of states, partition function, pressure, internal energy, entropy, and specific heat are calculated. It will be shown that the breakdown of Lorentz invariance can be interpreted as a repulsive interaction, among the photons. Additionally, it will be proved that the presence of a deformed dispersion relation entails an increase in the entropy of the system. In other words, as a consequence of the loss of the aforementioned symmetry the number of microstates available to the corresponding equilibrium state grows.

A. Camacho; A. Macias

2007-02-28T23:59:59.000Z

288

Development of a coal-fueled Internal Manifold Heat Exchanger (IMHEX{reg_sign}) molten carbonate fuel cell. Volumes 1--6, Final report  

DOE Green Energy (OSTI)

The design of a CGMCFC electric generation plant that will provide a cost of eletricity (COE) which is lower than that of current electric generation technologies and which is competitive with other long-range electric generating systems is presented. This effort is based upon the Internal Manifold Heat Exchanger (IMHEX) technology as developed by the Institute of Gas Technology (IGT). The project was executed by selecting economic and performance objectives for alternative plant arrangements while considering process constraints identified during IMHEX fuel cell development activities at ICT. The four major subsystems of a coal-based MCFC power plant are coal gasification, gas purification, fuel cell power generation and the bottoming cycle. The design and method of operation of each subsystem can be varied, and, depending upon design choices, can have major impact on both the design of other subsystems and the resulting cost of electricity. The challenge of this project was to select, from a range of design parameters, those operating conditions that result in a preferred plant design. Computer modelling was thus used to perform sensitivity analyses of as many system variables as program resources and schedules would permit. In any systems analysis, it is imperative that the evaluation methodology be verifiable and comparable. The TAG Class I develops comparable (if imprecise) data on performance and costs for the alternative cases being studied. It identifies, from a range of options, those which merit more exacting scrutiny to be undertaken at the second level, TAG class II analysis.

Not Available

1991-09-01T23:59:59.000Z

289

Dispersed storage and generation impacts on energy management systems  

SciTech Connect

This paper examines the various technologies for small-scale generation or storage of electricity known collectively as dispersed storage and generation, DSG. DSGs are seen to be an inhomogeneous group. The impact on energy management due to the integration of DSGs into the power system is examined, with emphasis on control, monitoring and operating problems.

Kirkham, H.; Klein, J.

1983-02-01T23:59:59.000Z

290

Single atom identification by energy dispersive x-ray spectroscopy  

SciTech Connect

Using aberration-corrected scanning transmission electron microscope and energy dispersive x-ray spectroscopy, single, isolated impurity atoms of silicon and platinum in monolayer and multilayer graphene are identified. Simultaneously acquired electron energy loss spectra confirm the elemental identification. Contamination difficulties are overcome by employing near-UHV sample conditions. Signal intensities agree within a factor of two with standardless estimates.

Lovejoy, T. C.; Dellby, N.; Krivanek, O. L. [Nion, 1102 8th St., Kirkland, Washington 98033 (United States); Ramasse, Q. M. [SuperSTEM Laboratory, STFC Daresbury, Keckwick Lane, Daresbury WA4 4AD (United Kingdom); Falke, M.; Kaeppel, A.; Terborg, R. [Bruker Nano GmbH, Schwarzschildstr. 12, 12489 Berlin (Germany); Zan, R. [School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)

2012-04-09T23:59:59.000Z

291

Competitive Clustering in a Bi-disperse Granular Gas  

E-Print Network (OSTI)

A bi-disperse granular gas in a compartmentalized system is experimentally found to cluster competitively: Depending on the shaking strength, the clustering can be directed either towards the compartment initially containing mainly small particles, or to the one containing mainly large particles. The experimental observations are quantitatively explained within a flux model.

René Mikkelsen; Devaraj van der Meer; Ko van der Weele; Detlef Lohse

2002-10-06T23:59:59.000Z

292

Prospects for constraining quantum gravity dispersion with near term observations  

E-Print Network (OSTI)

We discuss the prospects for bounding and perhaps even measuring quantum gravity effects on the dispersion of light using the highest energy photons produced in gamma ray bursts measured by the Fermi telescope. These prospects are brigher than might have been expected as in the first 10 months of operation Fermi has reported so far eight events with photons over 100 MeV seen by its Large Area Telescope (LAT). We review features of these events which may bear on Planck scale phenomenology and we discuss the possible implications for the alternative scenarios for in-vacua dispersion coming from breaking or deforming of Poincare invariance. Among these are semi-conservative bounds, which rely on some relatively weak assumptions about the sources, on subluminal and superluminal in-vacuo dispersion. We also propose that it may be possible to look for the arrival of still higher energy photons and neutrinos from GRB's with energies in the range 10^14 - 10^17 eV. In some cases the quantum gravity dispersion effect w...

Amelino-Camelia, Giovanni

2009-01-01T23:59:59.000Z

293

Generating seamless surfaces for transport and dispersion modeling in GIS  

Science Conference Proceedings (OSTI)

A standard use of triangulation in GIS is to model terrain surface using TIN. In many simulation models of physical phenomena, triangulation is often used to depict the entire spatial domain, which may include buildings, landmarks and other surface objects ... Keywords: CAD, Computational fluid dynamics, Computational geometry, GIS, Mesh generation, Transport and dispersion

Fernando Camelli; Jyh-Ming Lien; Dayong Shen; David W. Wong; Matthew Rice; Rainald Löhner; Chaowei Yang

2012-04-01T23:59:59.000Z

294

Uniform Dispersion of Nanoparticles in Metal Matrix Nanocomposites  

Science Conference Proceedings (OSTI)

Conference Tools for 2012 TMS Annual Meeting & Exhibition ... Two examples are presented in this report: (1) uniform dispersion of Al2O3 nanoparticles in A206 ... Aluminum Metal Matrix Composite via Direct Metal Laser Deposition: Processing And Mechanical Characterization ... Contact programming@

295

Reliability of wind power from dispersed sites: a preliminary assessment  

DOE Green Energy (OSTI)

The reliability benefit of geographically dispersed wind turbine generators is analyzed. Electricity produced from wind machines experiences wide fluctuations of output at a given site. Yet the value of electricity is a function of its reliability. Pricing schedules have traditionally valued firm power, that is, reliably available power, much more highly than ''dump power;'' that is, power which is available intermittently on an ''if and when'' basis. The conventional wisdom on wind power suggests that it is unrealistic to expect that wind generation will be sufficiently reliable to displace conventional capacity. While such conclusions may be valid for analysis of individual sites, the main thesis of this paper is that geographical dispersal improves aggregate reliability.

Kahn, E.

1978-04-01T23:59:59.000Z

296

Nematic droplets in aqueous dispersions of carbon nanotubes  

E-Print Network (OSTI)

Aqueous dispersions of exfoliated, bile-salt stabilized single-wall carbon nanotubes exhibit a first order transition to a nematic liquid-crystalline phase. The nematic phase presents itself in the form of micron-sized nematic droplets also known as tactoids, freely floating in the isotropic host dispersion. The nematic droplets are spindle shaped and have an aspect ratio of about four, irrespective of their size. We attribute this to a director field that is uniform rather than bipolar, which is confirmed by polarization microscopy. It follows that the ratio of the anchoring strength and the surface tension must be about four, which is quite larger than predicted theoretically but in line with earlier observations of bipolar tactoids. From the scatter in the data we deduce that the surface tension of the coexisting isotropic and nematic phases must be extremely low, that is, of the order of nN/m.

Nicolas Puech; Eric Grelet; Philippe Poulin; Christophe Blanc; Paul van der Schoot

2013-06-23T23:59:59.000Z

297

Self-induced transparency in a dispersive medium  

Science Conference Proceedings (OSTI)

The evolution of the electromagnetic field in a two-level medium occurring in a matrix with finite response time has been studied. An integrable variant of the Maxwell-Bloch equations with allowance for nonlinear dispersion is derived and solved using the inverse scattering problem. It is shown that the nonlinear dispersion caused by the finite response time of the matrix yields a new possibility of controlling soliton parameters. A particular case of the constructed model can be used to describe field pulses in the parameter domain that occurs between the regions of applicability of the quasi-monochromatic approximation and the approximation of unidirectional propagation of pulses with durations on the order of the oscillation period.

Zabolotskii, A. A., E-mail: zabolotskii@iae.nsk.su [Russian Academy of Sciences, Institute of Automatics and Electrometry, Siberian Branch (Russian Federation)

2012-07-15T23:59:59.000Z

298

A fractional dispersion model for overland solute transport  

E-Print Network (OSTI)

Using the kinematic-wave overland flow equation and a fractional dispersion-advection equation, a process-oriented, physically-based model is developed for overland solute transport. Two scenarios, one consisting of downslope and the other of upslope rainstorm movements, are considered for numerical computations. Under these conditions, the hydrograph displays a long-tailed distribution due to the variation in flow velocity in both time and distance. The solute transport exhibits a complex behavior. Pollutographs are characterized by a steep rising limb, with a peak, and a long, stretched receding limb; whereas the solute concentration distributions feature a rapid receding limb followed by a long stretched rising limb. Downslope moving storms cause much higher peak in both hydrographs and pollutographs than do upslope moving storms. Both hydrographs and the pollutographs predicted by the fractional dispersion model are in good agreement with the data measured experimentally using a soil flume and a moving rainfall simulator.

Deng, Zhi-Qiang; de Lima, M. Isabel P.; Singh, Vijay P.; de Lima, Jo??o L. M. P.

2006-03-18T23:59:59.000Z

299

Dispersion modeling of ground-level area sources of particulate  

E-Print Network (OSTI)

The use of dispersion modeling by State Air Pollution hics. Regulatory Agencies (SAPRAS) is increasing. Dispersion modeling provides a quick and efficient means of determining the downwind impact of pollutant release from a source. The SAPRAS are charged with the task of insuring that public exposure levels of these pollutants are less than the standards set by the United States Environmental Protection Agency (US EPA). Estimating the concentration of pollutant at some distance downwind, in most cases the property line, allows that SAPRAS to determine whether or not a source needs to install additional means of control in order to decrease the rate of pollutant release. One set of models approved for regulatory use by the US EPA is Industrial Source Complex (ISC). ISC includes SCREEN: which is a simple screening model with imbedded meteorological data, and ST3 which is a more refined model requiring meteorological data to be provided. ISC models are based on the concept of Gaussian dispersion. The concentration determined using the ISC models are a result of determining concentrations based on a single wind speed and direction for a one hour time period. The first step in the formulation of a new model was to incorporate smaller time periods into the concentration predictions, in order to account for variation or wind speed and direction within an hour period. For ground-level sources, the vertical distribution involves mathematically dispersing the pollutant underground, then reflecting it back up. The next step taken in the new model development was the incorporation of a triangular distribution in the Medical plane. The triangular distribution is entirely above ground. Once the new model was formulated, a sample modeling procedure was performed in order to compare the behavior of the new model as compared to ISC ST3. Examination of the characteristics of the two models, the meteorological data, and the output from the modeling procedures allows the comparison and contrast of the behavioral characteristics of the two models.

Fritz, Bradley Keith

1998-01-01T23:59:59.000Z

300

Proposed solid-state Faraday anomalous-dispersion optical filter  

Science Conference Proceedings (OSTI)

We propose a Faraday anomalous dispersion optical filter (FADOF) based on a rare-earth ion doped crystal. We present theoretical analyses for the solid-state FADOF transmission. Our theoretical model predicts a maximum transmission efficiency of 71% and a double-peaked transmission spectrum with a bandwidth of 6 GHz under current experimental conditions. Our proposal may have important applications in optical communications.

Lin, Wei-Bin [Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026 (China); Institute of Laser Technology, Hefei University of Technology, Hefei 230009 (China); Zhou, Zong-Quan; Li, Chuan-Feng; Guo, Guang-Can [Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026 (China)

2011-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Hanford atmospheric dispersion data: 1960 through June 1967  

Science Conference Proceedings (OSTI)

This volume presents dispersion and supporting meteorological data from experiments conducted over relatively flat terrain at Hanford, Washington from January 1960 through June 1967. The nature of the experiments, the sampling grids, and the tracer techniques used are described in the narrative portion of the document. Appendices contain the time-integrated concentrations for samplers within the plumes, summaries of the concentration distributions across the plumes, and wind and temperature profile data for each release period. 18 references, 7 figures, 3 tables.

Nickola, P.W.; Ramsdell, J.V.; Glantz, C.S.; Kerns, R.E.

1983-11-01T23:59:59.000Z

302

Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling...  

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

"Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of...

303

Ensemble Simulations with Coupled Atmospheric Dynamic and Dispersion Models: Illustrating Uncertainties in Dosage Simulations  

Science Conference Proceedings (OSTI)

Ensemble simulations made using a coupled atmospheric dynamic model and a probabilistic Lagrangian puff dispersion model were employed in a forensic analysis of the transport and dispersion of a toxic gas that may have been released near Al ...

Thomas T. Warner; Rong-Shyang Sheu; James F. Bowers; R. Ian Sykes; Gregory C. Dodd; Douglas S. Henn

2002-05-01T23:59:59.000Z

304

Quantifying Dispersal and Connectivity of Surface Waters Using Observational Lagrangian Measurements  

Science Conference Proceedings (OSTI)

Probability distribution functions of displacement are central to Lagrangian statistics and the study of fluid dispersal. A method for computing marginal probability distributions of passive tracer dispersal from Lagrangian observations is ...

Christopher G. Piecuch; Tatiana A. Rynearson

2012-08-01T23:59:59.000Z

305

A More Extensive Investigation of the Use of Ensemble Forecasts for Dispersion Model Evaluation  

Science Conference Proceedings (OSTI)

An ensemble forecast is used as input to a Lagrangian particle dispersion model to study the effect that analysis errors in the numerical weather prediction assimilation cycle have on dispersion modeling. The wind and temperature fields from a ...

Anne Grete Straume

2001-03-01T23:59:59.000Z

306

Analytic Solution of a One-Dimensional Equation for Aerosol and Gas Dispersion in the Stratosphere  

Science Conference Proceedings (OSTI)

The one-dimensional equation for dispersion of an inert tracer in an exponentially stratified fluid with exponential dispersion coefficient admits a simple analytic solution. The solution is a form of the gamma distribution of which the usual ...

J. Ben Liley

1995-09-01T23:59:59.000Z

307

Source Characterization with a Genetic Algorithm–Coupled Dispersion–Backward Model Incorporating SCIPUFF  

Science Conference Proceedings (OSTI)

This paper extends the approach of coupling a forward-looking dispersion model with a backward model using a genetic algorithm (GA) by incorporating a more sophisticated dispersion model [the Second-Order Closure Integrated Puff (SCIPUFF) model] ...

Christopher T. Allen; Sue Ellen Haupt; George S. Young

2007-03-01T23:59:59.000Z

308

Heat transfer to impacting drops and post critical heat flux dispersed flow  

E-Print Network (OSTI)

Heat transfer to drops impacting on a hot surface is examined in context of dispersions of flowing, boiling fluids. The liquid contribution to heat transfer from a hot tube to a two-phase dispersion is formulated in terms ...

Kendall, Gail E.

1978-01-01T23:59:59.000Z

309

Validation of a Receptor–Dispersion Model Coupled with a Genetic Algorithm Using Synthetic Data  

Science Conference Proceedings (OSTI)

A methodology for characterizing emission sources is presented that couples a dispersion and transport model with a pollution receptor model. This coupling allows the use of the backward (receptor) model to calibrate the forward (dispersion) ...

Sue Ellen Haupt; George S. Young; Christopher T. Allen

2006-03-01T23:59:59.000Z

310

Dispersion of a Passive Tracer in Buoyancy- and Shear-Driven Boundary Layers  

Science Conference Proceedings (OSTI)

By means of finescale modeling [large-eddy simulation (LES)], the combined effect of thermal and mechanical forcing on the dispersion of a plume in a convective boundary layer is investigated. Dispersion of a passive tracer is studied in various ...

Alessandro Dosio; Jordi Vilà-Guerau de Arellano; Albert A. M. Holtslag; Peter J. H. Builtjes

2003-08-01T23:59:59.000Z

311

Lagrangian drifter dispersion in the southwestern Atlantic Ocean  

E-Print Network (OSTI)

In the framework of Monitoring by Ocean Drifters (MONDO) Project, a set of Lagrangian drifters were released in proximity of the Brazil Current, the western branch of the Subtropical Gyre in the South Atlantic Ocean. The experimental strategy of deploying part of the buoys in clusters offers the opportunity to examine relative dispersion on a wide range of scales. Adopting a dynamical systems approach, we focus our attention on scale-dependent indicators, like the finite-scale Lyapunov exponent (FSLE) and the finite-scale (mean square) relative velocity (FSRV) between two drifters as function of their separation, and compare them with classic time-dependent statistical quantities like the mean square relative displacement between two drifters and the effective diffusivity as functions of the time lag from the release. We find that, dependently on the given observable, the quasigeostrophic turbulence scenario is overall compatible with our data analysis, with discrepancies from the expected behavior of 2D turbulent trajectories likely to be ascribed to the non stationary and non homogeneous characteristics of the flow, as well as to possible ageostrophic effects. Submesoscale features of O(1) km are considered to play a role, to some extent, in determining the properties of relative dispersion as well as the shape of the energy spectrum. We present, also, numerical simulations of an OGCM of the South Atlantic, and discuss the comparison between experimental and model data about mesoscale dispersion.

Stefano Berti; Francisco Alves Dos Santos; Guglielmo Lacorata; Angelo Vulpiani

2011-10-17T23:59:59.000Z

312

Foreword for Non-Dispersive Infrared (NDIR) Gas Measurement Today  

Science Conference Proceedings (OSTI)

Infrared spectroscopy provides the analytical laboratory with essential capabilities to identify and to quantify components of gas mixtures in a relatively straightforward manner. Except for symmetric diatomic species, most molecules are 'IR active' that is, they absorb IR light at specific energies associated with that molecule's vibrational and rotation modes. Simple molecules have a few predominant absorption energies and are easy to identify, while more complicated molecules with many bonds have many absorption peaks. To cover the full range of possible absorption energies, laboratory instruments initially employed dispersive elements, typically gratings, to scan over the wavelengths of interest. Today, Fourier-transform infrared (FTIR) spectroscopy has replaced most dispersive IR spectrometry due to improvements in speed and the signal-to-noise ratio but at the expense of instrumental complexity. The impressive analytical power of IR spectroscopy can be distilled into a tiny sensor for a restricted, but nevertheless very useful, set of chemical vapors. Non-dispersive infrared (NDIR) sensors use bandpass filters to select one, or at most a few, energy bands corresponding absorption by carbon dioxide, water, hydrocarbons, etc. Although the concept is simple, the task has proved to be elusive for constructing an NDIR sensor that maintains its calibration in spite of aging and environmental factors. Over the past four decades, Dr. Wong has been on the quest to perfect NDIR sensing, yet in very practical designs. This book reflects his journey, and more recently that of his coauthor, to do just that.

Warmack, Robert J Bruce [ORNL

2012-01-01T23:59:59.000Z

313

Anomalous magnetic moment of an electron near a dispersive surface  

E-Print Network (OSTI)

Changes in the magnetic moment of an electron near a dielectric or conducting surface due to boundary-dependent radiative corrections are investigated. The electromagnetic field is quantized by normal mode expansion for a non-dispersive dielectric and an undamped plasma, but the electron is described by the Dirac equation without matter-field quantization. Perturbation theory in the Dirac equation leads to a general formula for the magnetic moment shift in terms of integrals over products of electromagnetic mode functions. In each of the models investigated contour integration techniques over a complex wave vector can be used to derive a general formula featuring just integrals over transverse electric and transverse magnetic reflection coefficients of the surface. Analysis of the magnetic moment shift for several classes of materials yields markedly different results from the previously considered simplistic 'perfect reflector' model, due to the inclusion of physically important features of the electromagnetic response of the surface such as evanescent field modes and dispersion in the material. For a general dispersive dielectric surface, the magnetic moment shift of a nearby electron can exceed the previous prediction of the perfect-reflector model by several orders of magnitude.

Robert Bennett; Claudia Eberlein

2013-04-04T23:59:59.000Z

314

HUNTING FOR YOUNG DISPERSING STAR CLUSTERS IN IC 2574  

SciTech Connect

Dissolving stellar groups are very difficult to detect using traditional surface photometry techniques. We have developed a method to find and characterize non-compact stellar systems in galaxies where the young stellar population can be spatially resolved. By carrying out photometry on individual stars, we are able to separate the luminous blue stellar population from the star field background. The locations of these stars are used to identify groups by applying the HOP algorithm, which are then characterized using color-magnitude and stellar density radial profiles to estimate age, size, density, and shape. We test the method on Hubble Space Telescope Advanced Camera for Surveys archival images of IC 2574 and find 75 dispersed stellar groups. Of these, 20 highly dispersed groups are good candidates for dissolving systems. We find few compact systems with evidence of dissolution, potentially indicating that star formation in this galaxy occurs mostly in unbound clusters or groups. These systems indicate that the dispersion rate of groups and clusters in IC 2574 is at most 0.45 pc Myr{sup -1}. The location of the groups found with HOP correlate well with H I contour map features. However, they do not coincide with H I holes, suggesting that those holes were not created by star-forming regions.

Pellerin, Anne [Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843-4242 (United States); Meyer, Martin M. [International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, CRAWLEY WA 6009 (Australia); Calzetti, Daniella [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States); Harris, Jason, E-mail: apellerin@mta.ca, E-mail: martin.meyer@uwa.edu.au, E-mail: calzetti@astro.umass.edu, E-mail: jharris@30doradus.org [Illumina, Inc., 25861 Industrial Blvd, Hayward, CA 94545 (United States)

2012-12-01T23:59:59.000Z

315

Dispersion Morphology of Poly(methyl acrylate)/Silica Nanocomposites  

SciTech Connect

Nearly monodisperse poly(methyl acrylate) (PMA) and spherical SiO{sub 2} nanoparticles (NP, d = 14 {+-} 4 nm) were co-cast from 2-butanone, a mutually good solvent and a displacer of adsorbed PMA from silica. The effects of NP content and post-casting sample history on the dispersion morphology were found by small-angle X-ray scattering supplemented by transmission electron microscopy. Analysis of the X-ray results show that cast and thermally annealed samples exhibited a nearly random particle dispersion. That the same samples, prior to annealing, were not well-dispersed is indicative of thermodynamic miscibility during thermal annealing over the range of NP loadings studied. A simple mean-field thermodynamic model suggests that miscibility results primarily from favorable polymer segment/NP surface interactions. The model also indicates, and experiments confirm, that subsequent exposure of the composites to the likely displacer ethyl acetate results in entropic destabilization and demixing into NP-rich and NP-lean phases.

D Janes; J Moll; S Harton; C Durning

2011-12-31T23:59:59.000Z

316

On the axial dispersion induced by vibrations of a exible D. Brodaya,  

E-Print Network (OSTI)

dispersion of drugs in conduits of the cow's milk system is similar to gas dispersion in airways. Antibiotics that dispersion due to streaming eects in gas-®lled ¯exible tubes which vibrate in a long wave-length radial mode of enhancing dispersion in gas-®lled elastic tubes due to ¯ow induced by vibrations of the tube-walls. We

317

Research Note---Online Price Dispersion: A Game-Theoretic Perspective and Empirical Evidence  

Science Conference Proceedings (OSTI)

The existence and persistence of price dispersion for identical products in online markets have been well-documented in the literature. Possible explanations of this price dispersion, derived mainly using hedonic price models, have seen only modest success. ... Keywords: brand recognition, competitive strategy, e-service, online price dispersion, service quality, vertical differentiation

Sulin Ba; Jan Stallaert; Zhongju Zhang

2012-06-01T23:59:59.000Z

318

A lattice Boltzmann model for electromagnetic waves propagating in a one-dimensional dispersive medium  

Science Conference Proceedings (OSTI)

A first-order extended lattice Boltzmann (LB) model with special forcing terms for one-dimensional Maxwell equations exerting on a dispersive medium, described either by the Debye or Drude model, is proposed in this study. The time dependent dispersive ... Keywords: Debye model, Dispersive medium, Drude model, Electromagnetic waves, Lattice Boltzmann method, Lorentz model

Poting Chen; Chen-Hao Wang; Jeng-Rong Ho

2013-03-01T23:59:59.000Z

319

Uncertainty propagation in puff-based dispersion models using polynomial chaos  

Science Conference Proceedings (OSTI)

Atmospheric dispersion is a complex nonlinear physical process with numerous uncertainties in model parameters, inputs, source parameters, initial and boundary conditions. Accurate propagation of these uncertainties through the dispersion models is crucial ... Keywords: Atmospheric dispersion, Non-Gaussian distributions, Polynomial chaos, Sensitivity analysis, Uncertainty propagation

Umamaheswara Konda; Tarunraj Singh; Puneet Singla; Peter Scott

2010-12-01T23:59:59.000Z

320

Scaling properties of sea ice deformation from buoy dispersion P. Rampal,1,2  

E-Print Network (OSTI)

in a gas or two people in a crowd, two nearby pieces of sea ice gradually move apart and disperse [MartinScaling properties of sea ice deformation from buoy dispersion analysis P. Rampal,1,2 J. Weiss,1 D. The deformation is derived from the dispersion of pairs of drifting buoys, using the IABP (International Arctic

Lindsay, Ron

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While these samples are representative of the content of NLEBeta,
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321

Perspective: Advances and challenges in treating van der Waals dispersion forces in density functional theory  

E-Print Network (OSTI)

of the previous noble gas and group III atom. Fur- thermore, the dispersion energy, Edisp, is scaled according range dispersion interaction with the underlying exchange or XC functionals. A. Gas phase clustersPerspective: Advances and challenges in treating van der Waals dispersion forces in density

Alavi, Ali

322

Dispersion of elastic moduli in a porous-cracked rock: Theoretical predictions for squirt-flow  

E-Print Network (OSTI)

. Attenuation and dispersion of compressional waves in fluid-filled porous rocks with partial gas saturationDispersion of elastic moduli in a porous-cracked rock: Theoretical predictions for squirt-flow M Available online xxxx Keywords: Frequency dispersion Rock properties Bimodal porosity Effective medium

Fortin, Jérôme

323

Group-velocity-dispersion measurements of atmospheric and combustion-related gases using  

E-Print Network (OSTI)

, "Dispersion measurement of inert gases and gas mixtures at 800 nm," Appl. Opt. 47(27), 4856­4863 (2008). 17. T of the gas. For each gas measurement a pressure point was randomly selected, and the dispersion was measured (), and plot dispersion as a function of gas density in Fig. 3. As expected we see the linear dependence

Dantus, Marcos

324

Hydrogen Sulfide Dispersion Consequences Analysis in Different Wind Speeds: A CFD Based Approach  

Science Conference Proceedings (OSTI)

Hydrogen sulfide (h2s) leakage and dispersion from a sulfide recycle installation in different wind speeds are simulated by implementing a 3D Computational Fluid Dynamics (CFD) model. H2s concentrations of monitor points which represent dispersion contours ... Keywords: CFD, hydrogen Sulfide, dispersion, concenquences analysis, different wind speeds

Bo Zhang; Guo-ming Chen

2009-10-01T23:59:59.000Z

325

Modeling the effects of topography and wind on atmospheric dispersion of CO2 surface leakage at geologic carbon sequestration sites  

E-Print Network (OSTI)

model to model dense gas dispersion of CO 2 leakage. Themodified to simulate dense gas dispersion appropriate for CO3. Passive vs. dense gas dispersion The behavior of dense

Chow, Fotini K.

2009-01-01T23:59:59.000Z

326

Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities  

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

Atmospheric Dispersion and Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities Jim Dahl Manager, Nuclear Safety Analysis Sandia National Laboratories Office: 505-284-9067 Email: jjdahl@sandia.gov SAND2012-4478P Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. 2 Dispersion and Consequence Analysis at Sandia's TA-V Topics: * Site Characteristics * Dispersion Analysis Inputs - Meteorological Data - Stability Class - Dispersion Coefficients - Deposition Velocity

327

Riemannian Manifold Hamiltonian Monte Carlo  

E-Print Network (OSTI)

Girolami,M. Calderhead,B. Chin,S. DCS Technical Report Series pp 35 Dept of Computing Science, University of Glasgow

Girolami, M.

328

EQUALITY CONSTRAINTS, RIEMANNIAN MANIFOLDS AND ...  

E-Print Network (OSTI)

Jul 27, 2007 ... Also, the augmented Lagrangian pattern search algorithm in ..... where f,j is the partial derivative of f(y) in terms of xj, which is exactly (2.12). The ...... such a y and

329

Parabolic flows on complex manifolds  

E-Print Network (OSTI)

Chapter 2 Convergence of the parabolic complex Monge-Amp`ere65] Streets, J. , Tian, G. A parabolic flow of pluriclosedGill, M. Convergence of the parabolic complex Monge-Amp` ere

Gill, Matthew Franklin

2012-01-01T23:59:59.000Z

330

Realtime structural electrochemistry of platinum clusters using dispersive XAFS  

DOE Green Energy (OSTI)

Chemical reference tables state that the standard potential for the reaction of Pt with water, Pt + 2H{sub 2}O {r_arrow} Pt(OH){sub 2} + 2H{sup +} + 2e{sup {minus}}, is 0.98 V, and electrochemical studies propose that this reaction may occur at potentials as low as 0.8 V. Using dispersive x-ray absorption fine-structure (XAFS) spectroscopy, the authors have directly probed the structural evolution of a Pt catalyst operating in-situ in a polymer electrolyte fuel cell during cyclic voltammetry. The changes in the number of Pt and O nearest-neighbors and the Pt charge demonstrate a close correspondence with features in the voltammogram. Because dispersive XAFS is very sensitive to detecting structural changes, they have been able to detect the presence of chemisorbed oxygen at potentials of 0.6--0.9 V in the anodic sweep. Since double-layer charging is regarded as the only process in this region for bulk Pt, these results may reflect a limitation of previous (indirect) studies on Pt electrochemistry, or they may indicate that these clusters are different from their bulk metal counterparts. Exploiting the time-resolving capability of dispersive XAFS, they also monitored changes in the Pt charge and the number of O and Pt nearest-neighbors during the electrochemical oxidation and reduction of the Pt clusters in real-time. The results are inconsistent with those expected from the place-exchange mechanism for the formation of the surface oxide on bulk Pt electrodes in aqueous solution; Pt{sub red} (k{sub 1}) {yields} Pt (submonolayer O)(k{sub 2}) {yields} PtO{sub x} (place exchanged Pt and O atoms: k{sub 1} >> k{sub 2}). Their current model for understanding these behaviors is that, relative to bulk Pt, unusual types of surface sites play a major role in determining the reactivity of these clusters.

Allen, P.G.; Conradson, S.D.; Wilson, M.S.; Gottesfeld, S.; Raistrick, I.D.

1993-12-31T23:59:59.000Z

331

Evaluation study of building-resolved urban dispersion models  

SciTech Connect

For effective emergency response and recovery planning, it is critically important that building-resolved urban dispersion models be evaluated using field data. Several full-physics computational fluid dynamics (CFD) models and semi-empirical building-resolved (SEB) models are being advanced and applied to simulating flow and dispersion in urban areas. To obtain an estimate of the current state-of-readiness of these classes of models, the Department of Homeland Security (DHS) funded a study to compare five CFD models and one SEB model with tracer data from the extensive Midtown Manhattan field study (MID05) conducted during August 2005 as part of the DHS Urban Dispersion Program (UDP; Allwine and Flaherty 2007). Six days of tracer and meteorological experiments were conducted over an approximately 2-km-by-2-km area in Midtown Manhattan just south of Central Park in New York City. A subset of these data was used for model evaluations. The study was conducted such that an evaluation team, independent of the six modeling teams, provided all the input data (e.g., building data, meteorological data and tracer release rates) and run conditions for each of four experimental periods simulated. Tracer concentration data for two of the four experimental periods were provided to the modeling teams for their own evaluation of their respective models to ensure proper setup and operation. Tracer data were not provided for the second two experimental periods to provide for an independent evaluation of the models. The tracer concentrations resulting from the model simulations were provided to the evaluation team in a standard format for consistency in inter-comparing model results. An overview of the model evaluation approach will be given followed by a discussion on the qualitative comparison of the respective models with the field data. Future model developments efforts needed to address modeling gaps identified from this study will also be discussed.

Flaherty, Julia E.; Allwine, K Jerry; Brown, Mike J.; Coirier, WIlliam J.; Ericson, Shawn C.; Hansen, Olav R.; Huber, Alan H.; Kim, Sura; Leach, Martin J.; Mirocha, Jeff D.; Newsom, Rob K.; Patnaik, Gopal; Senocak, Inanc

2007-09-10T23:59:59.000Z

332

Plutonium explosive dispersal modeling using the MACCS2 computer code  

Science Conference Proceedings (OSTI)

The purpose of this paper is to derive the necessary parameters to be used to establish a defensible methodology to perform explosive dispersal modeling of respirable plutonium using Gaussian methods. A particular code, MACCS2, has been chosen for this modeling effort due to its application of sophisticated meteorological statistical sampling in accordance with the philosophy of Nuclear Regulatory Commission (NRC) Regulatory Guide 1.145, ``Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants``. A second advantage supporting the selection of the MACCS2 code for modeling purposes is that meteorological data sets are readily available at most Department of Energy (DOE) and NRC sites. This particular MACCS2 modeling effort focuses on the calculation of respirable doses and not ground deposition. Once the necessary parameters for the MACCS2 modeling are developed and presented, the model is benchmarked against empirical test data from the Double Tracks shot of project Roller Coaster (Shreve 1965) and applied to a hypothetical plutonium explosive dispersal scenario. Further modeling with the MACCS2 code is performed to determine a defensible method of treating the effects of building structure interaction on the respirable fraction distribution as a function of height. These results are related to the Clean Slate 2 and Clean Slate 3 bunkered shots of Project Roller Coaster. Lastly a method is presented to determine the peak 99.5% sector doses on an irregular site boundary in the manner specified in NRC Regulatory Guide 1.145 (1983). Parametric analyses are performed on the major analytic assumptions in the MACCS2 model to define the potential errors that are possible in using this methodology.

Steele, C.M.; Wald, T.L.; Chanin, D.I.

1998-11-01T23:59:59.000Z

333

Dispersion relations of externally and thermally excited dust lattice modes in 2D complex plasma crystals  

SciTech Connect

The dispersion relations of the externally and thermally (naturally) excited dust lattice modes (both longitudinal and transverse) in two-dimensional Debye-Yukawa complex plasma crystals are investigated. The dispersion relations are calculated numerically by taking the neutral gas damping effects into account and the numerical results are in agreement with the experimental data given by Nunomura et al.[Phys. Rev. E 65, 066402 (2002)]. It is found that for the mode excited by an external disturbance with a real frequency, the dispersion properties are changed at a critical frequency near where the group velocity of the mode goes to zero. Therefore, the high frequency branch with negative dispersion cannot be reached. In contrast, for the thermally excited mode, the dispersion curve can extend all the way to the negative dispersion region, while a 'cut-off' wave number exists at the long wavelength end of the dispersion in the transverse mode.

Yang Xuefeng; Cui Jian; Zhang Yuan [School of Mathematical Sciences, Dalian University of Technology, Dalian 116024 (China); Liu Yue [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)

2012-07-15T23:59:59.000Z

334

Dispersion toughened ceramic composites and method for making same  

DOE Patents (OSTI)

Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa..sqrt..m which represents a significant increase over that of silicon carbide.

Stinton, D.P.; Lackey, W.J.; Lauf, R.J.

1984-09-28T23:59:59.000Z

335

Sensitivity of numerical dispersion modeling to explosive source parameters  

Science Conference Proceedings (OSTI)

The calculation of downwind concentrations from non-traditional sources, such as explosions, provides unique challenges to dispersion models. The US Department of Energy has assigned the Atmospheric Release Advisory Capability (ARAC) at the Lawrence Livermore National Laboratory (LLNL) the task of estimating the impact of accidental radiological releases to the atmosphere anywhere in the world. Our experience includes responses to over 25 incidents in the past 16 years, and about 150 exercises a year. Examples of responses to explosive accidents include the 1980 Titan 2 missile fuel explosion near Damascus, Arkansas and the hydrogen gas explosion in the 1986 Chernobyl nuclear power plant accident. Based on judgment and experience, we frequently estimate the source geometry and the amount of toxic material aerosolized as well as its particle size distribution. To expedite our real-time response, we developed some automated algorithms and default assumptions about several potential sources. It is useful to know how well these algorithms perform against real-world measurements and how sensitive our dispersion model is to the potential range of input values. In this paper we present the algorithms we use to simulate explosive events, compare these methods with limited field data measurements, and analyze their sensitivity to input parameters. 14 refs., 7 figs., 2 tabs.

Baskett, R.L. (EG and G Energy Measurements, Inc., Pleasanton, CA (USA)); Cederwall, R.T. (Lawrence Livermore National Lab., CA (USA))

1991-02-13T23:59:59.000Z

336

Observations and modelling of dispersion meteorology in the  

E-Print Network (OSTI)

Fuelled by offshore natural gas, industrial development is growing steadily in coastal parts of Western Australia’s Pilbara region. In this paper, we present an analysis of meteorological data from the area, with an emphasis on those aspects that are important for the dispersion of pollutants. Three distinct wind patterns are identified, corresponding basically to the warmer, cooler and transitional months. The dominant pattern for the transitional months is particularly interesting, consisting of boundary-layer winds, up to a height of about 1000 m, rotating through 360 degrees over a 24-hour period. This can occur over several consecutive days and has implications for the recirculation of pollutants. Onshore winds occur on about 70 per cent of days, suggesting that fumigation of elevated plumes to the ground in thermal internal boundary layers (TIBLs) is also likely to be an important process for dispersion in the region. Data are presented that support the existence of these two processes. The Air Pollution Model (TAPM) is used to simulate the mesoscale meteorology of the region. It is able to reproduce the diurnal behaviour of the three wind regimes, as well as the vertical structure observed in early morning and evening wind profiles. A comparison with data shows good simulation of TIBL development in onshore flow and also recirculation of emissions back onshore in early evening, giving confidence in the application of TAPM as an air quality management tool in the Pilbara region.

Pilbara Region; W. L. Physick; K. N. Rayner; P. Mountford; M. Edwards

2003-01-01T23:59:59.000Z

337

A multi-crystal wavelength dispersive x-ray spectrometer  

Science Conference Proceedings (OSTI)

A multi-crystal wavelength dispersive hard x-ray spectrometer with high-energy resolution and large solid angle collection is described. The instrument is specifically designed for time-resolved applications of x-ray emission spectroscopy (XES) and x-ray Raman scattering (XRS) at X-ray Free Electron Lasers (XFEL) and synchrotron radiation facilities. It also simplifies resonant inelastic x-ray scattering (RIXS) studies of the whole 2d RIXS plane. The spectrometer is based on the Von Hamos geometry. This dispersive setup enables an XES or XRS spectrum to be measured in a single-shot mode, overcoming the scanning needs of the Rowland circle spectrometers. In conjunction with the XFEL temporal profile and high-flux, it is a powerful tool for studying the dynamics of time-dependent systems. Photo-induced processes and fast catalytic reaction kinetics, ranging from femtoseconds to milliseconds, will be resolvable in a wide array of systems circumventing radiation damage.

Alonso-Mori, Roberto; Montanez, Paul; Delor, James; Bergmann, Uwe [LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Kern, Jan [LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-8099 (United States); Sokaras, Dimosthenis; Weng, Tsu-Chien; Nordlund, Dennis [SSRL, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Tran, Rosalie; Yachandra, Vittal K.; Yano, Junko [Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-8099 (United States)

2012-07-15T23:59:59.000Z

338

Hamiltonian extension and eigenfunctions for a time dispersive dissipative string  

E-Print Network (OSTI)

We carry out a detailed analysis of a time dispersive dissipative (TDD) string, using our recently developed conservative and Hamiltonian extensions of TDD systems. This analysis of the TDD string includes, in particular: (i) an explicit construction of its conservative Hamiltonian extension, consisting of the physical string coupled to "hidden strings;" (ii) explicit formulas for energy and momentum densities in the extended system, providing a transparent physical picture accounting precisely for the dispersion and dissipation; (iii) the eigenmodes for the extended string system, which provide an eigenmode expansion for solutions to the TDD wave equation governing the TDD string. In particular, we find that in an eigenmode for the extended system the displacement of the physical string does not satisfy the formal eigenvalue problem, but rather an equation with a source term resulting from the excitation of the hidden strings. The obtained results provide a solid basis for the rigorous treatment of the long standing problem of scattering by a TDD scatterer, illustrated here by the computation of scattering states for a string with dissipation restricted to a half line.

Alexander Figotin; Jeffrey Schenker

2006-03-31T23:59:59.000Z

339

Enhanced immunological and detoxification responses in Pacific oysters, Crassostrea gigas, exposed1 to chemically dispersed oil2  

E-Print Network (OSTI)

to chemically dispersed oil2 3 Luna-Acosta, A.a,* , Kanan, R.b , Le Floch, S.b , Huet, V.a , Pineau P;Abstract: The aim of this study was to evaluate the effects of chemically dispersed oil on an20 of the chemical dispersant. After 2 days of exposure to chemically dispersed28 oil, alkylated naphthalenes

Paris-Sud XI, Université de

340

Liver antioxidant and plasmatic immune responses in juvenile1 golden grey mullet (Liza aurata) exposed to dispersed crude oil2  

E-Print Network (OSTI)

) exposed to dispersed crude oil2 3 Thomas Milinkovitch1* , Awa Ndiaye2 , Wilfried Sanchez2 , Stéphane Le ; CD : Chemically Dispersed oil ; D : Dispersant solution ; MD : Mechanically Dispersed oil; WSF application is an oil spill response technique. To evaluate the environmental31 cost of this operation

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Formation and evolution of interstellar filaments; Hints from velocity dispersion measurements  

E-Print Network (OSTI)

We investigate the gas velocity dispersions of a sample of filaments recently detected as part of the Herschel Gould Belt Survey in the IC5146, Aquila, and Polaris interstellar clouds. To measure these velocity dispersions, we use 13CO, C18O, and N2H+ line observations obtained with the IRAM 30m telescope. Correlating our velocity dispersion measurements with the filament column densities derived from Herschel data, we show that interstellar filaments can be divided into two regimes: thermally subcritical filaments, which have transonic velocity dispersions (c_s ~dispersions scaling roughly as the square root of column density (\\sigma_tot ~ \\Sigma^0.5), and are self-gravitating. The higher velocity dispersions of supercritical filaments may not directly arise from supersonic interstellar turbulence but may be driven by gravitational contraction/accretion...

Arzoumanian, Doris; Peretto, Nicolas; Konyves, Vera

2013-01-01T23:59:59.000Z

342

Investigations of MACCS2 for LANL Dispersion Analysis  

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

Investigations of MACCS2 Investigations of MACCS2 Investigations of MACCS2 Investigations of MACCS2 for LANL Dispersion Analysis p y DOE Workshop Germantown, MD Raymond F. Sartor, Ph.D. Safety Basis Technical Services June 5-6, 2012 Safety Basis - Technical Services Los Alamos National Laboratory Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Basic Equation for Ground-Level Release Basic Equation for Ground-Level Release                                                

343

Method for dispersing catalyst onto particulate material and product thereof  

DOE Patents (OSTI)

A method for dispersing finely divided catalyst precursors onto the surface of coal or other particulate material includes the steps of forming a wet paste mixture of the particulate material and a liquid solution containing a dissolved transition metal salt, for instance a solution of ferric nitrate. The wet paste mixture is in a state of incipient wetness with all of this solution adsorbed onto the surfaces of the particulate material without the presence of free moisture. On adding a precipitating agent such as ammonia, a catalyst precursor such as hydrated iron oxide is deposited on the surfaces of the coal. The catalyst is activated by converting it to the sulfide form for the hydrogenation or direct liquefaction of the coal.

Utz, Bruce R. (Pittsburgh, PA); Cugini, Anthony V. (Pittsburgh, PA)

1992-01-01T23:59:59.000Z

344

Electric moulding of dispersed lipid nanotubes into a nanofluidic device  

E-Print Network (OSTI)

Hydrophilic nanotubes formed by lipid molecules have potential applications as platforms for chemical or biological events occurring in an attolitre volume inside a hollow cylinder. Here, we have integrated the lipid nanotubes (LNTs) by applying an AC electric field via plug-in electrode needles placed above a substrate. The off-chip assembly method has the on-demand adjustability of an electrode configuration, enabling the dispersed LNT to be electrically moulded into a separate film of parallel LNT arrays in one-step. The fluorescence resonance energy transfer technique as well as the digital microscopy visualised the overall filling of gold nanoparticles up to the inner capacity of an LNT film by capillary action, thereby showing the potential of this flexible film for use as a high-throughput nanofluidic device where not only is the endo-signalling and product in each LNT multiplied but also the encapsulated objects are efficiently transported and reacted.

Hiroshi Frusawa; Tatsuhiko Manabe; Eri Kagiyama; Ken Hirano; Naohiro Kameta; Mitsutoshi Masuda; Toshimi Shimizu

2013-07-13T23:59:59.000Z

345

The Photon Dispersion as an Indicator for New Physics ?  

E-Print Network (OSTI)

We first comment on the search for a deviation from the linear photon dispersion relation, in particular based on cosmic photons from Gamma Ray Bursts. Then we consider the non-commutative space as a theoretical concept that could lead to such a deviation, which would be a manifestation of Lorentz Invariance Violation. In particular we review a numerical study of pure U(1) gauge theory in a 4d non-commutative space. Starting from a finite lattice, we explore the phase diagram and the extrapolation to the continuum and infinite volume. These simultaneous limits - taken at fixed non-commutativity - lead to a phase of broken Poincare symmetry, where the photon appears to be IR stable, despite a negative IR divergence to one loop.

Wolfgang Bietenholz

2010-08-23T23:59:59.000Z

346

LES based urban dispersal predictions for consequence management  

Science Conference Proceedings (OSTI)

It is unlikely that we will ever have a deterministic predictive framework for the study of flows in urban scale scenarios purely based on computational fluid dynamics. This is due to the inherent difficulty in modeling and validating all relevant physical sub-processes and acquiring all the necessary and relevant boundary condition information. On the other hand, this case is representative of very fundamental ones for which whole-domain scalable laboratory (or field) studies are impossible or very difficult, but for which it is also crucial to develop predictability. In this paper, we discuss a framework for detailed dispersal predictions in urban and regional settings based on effective linkage of strong motion codes - capable of simulating detailed energetic and contaminant sources, and large-eddy simulation - capable of emulating contaminant transport due to wind and turbulence fields in built-up areas. Challenging technical aspects of the simulation approach are outlined and recent progress is reviewed in th is context.

Grinstein, Fernando Franklin [Los Alamos National Laboratory; Bos, Randall [Los Alamos National Laboratory; Dey, Tom [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

347

Urban Dispersion Program Overview and MID05 Field Study Summary  

SciTech Connect

The Urban Dispersion Program (UDP) was a 4-year project (2004–2007) funded by the U.S. Department of Homeland Security with additional support from the Defense Threat Reduction Agency. The U.S. Environmental Protection Agency (EPA) also contributed to UDP through funding a human-exposure component of the New York City (NYC) field studies in addition to supporting an EPA scientist in conducting modeling studies of NYC. The primary goal of UDP was to improve the scientific understanding of the flow and diffusion of airborne contaminants through and around the deep street canyons of NYC. The overall UDP project manager and lead scientist was Dr. Jerry Allwine of Pacific Northwest National Laboratory. UDP had several accomplishments that included conducting two tracer and meteorological field studies in Midtown Manhattan.

Allwine, K Jerry; Flaherty, Julia E.

2007-07-31T23:59:59.000Z

348

Molecular simulation of nano-dispersed fluid phases  

E-Print Network (OSTI)

Fluid phase equilibria involving nano-dispersed phases, where at least one of the coexisting phases is confined to a small volume, are investigated by molecular dynamics simulation. Complementing previous studies on nanoscopic droplets, simulation volumes containing a nanoscopic gas bubble surrounded by a subsaturated liquid phase under tension, i.e. at negative pressure, are conducted in the canonical ensemble. The boundary conditions are chosen such that the phase equilibrium at the curved interface is thermodynamically stable. Two distinct size-dependent effects are found: Curvature induces a subsaturation of the system, leading to a smaller liquid density. For the gas in the centre of the bubble, the small diameter has an additional obverse effect, increasing its density. The curvature dependence of the surface tension is discussed by evaluating average radial density profiles to obtain the excess equimolar radius, which is found to be positive, corresponding to a negative Tolman length.

Martin Horsch; Hans Hasse

2013-07-22T23:59:59.000Z

349

Plasma dispersion function for a Fermi-Dirac distribution  

SciTech Connect

A plasma dispersion function (PDF) is defined for a nonrelativistic Fermi-Dirac distribution and its properties are explored. The degree of degeneracy is described by a parameter {xi}=e{sup {mu}}{sub e}{sup /T}{sub e}, for electrons, with {mu}{sub e}/T{sub e} large and negative in the nondegenerate limit, and large and positive in the completely degenerate limit. The PDF is denoted Z(y,{xi}), where the variable y={omega}/{radical}(2)kV{sub e}, is the argument of the conventional PDF, Z(y)=Z(y,0), for a Maxwellian distribution. In the completely degenerate limit, Z(y,{xi}) approaches a logarithmic function that depends on the Fermi temperature and is independent of T{sub e}. Analytic approximations to Z(y,{xi}) are derived in terms of polylogarithmic functions for y{sup 2}>>1 and for y{sup 2}<<1.

Melrose, D. B. [School of Physics, University of Sydney, New South Wales 2006 (Australia); Mushtaq, A. [School of Physics, University of Sydney, New South Wales 2006 (Australia); Theoretical Plasma Physics Division, PINSTECH, Nilore, 44000 Islamabad (Pakistan)

2010-12-15T23:59:59.000Z

350

Local volume-time averaged equations of motion for dispersed, turbulent, multiphase flows  

Science Conference Proceedings (OSTI)

In most flows of liquids and their vapors, the phases are dispersed randomly in both space and time. These dispersed flows can be described only statistically or in terms of averages. Local volume-time averaging is used here to derive a self-consistent set of equations governing momentum and energy transfer in dispersed, turbulent, multiphase flows. The empiricisms required for use with these equations are the subject of current research.

Sha, W.T.; Slattery, J.C.

1980-11-01T23:59:59.000Z

351

Dispersants for Tube Fouling Control: Volume 2: Short-Term Trial at ANO-2  

Science Conference Proceedings (OSTI)

Dispersants have been used for several decades in fossil boiler units to inhibit corrosion product deposition in the boiler. However, until recently, a dispersant of sufficient purity had not been available for nuclear application. This report summarizes the methodology and results of the full-scale, short-term trial of a high-purity, high molecular weight BetzDearborn polyacrylic acid (PAA) dispersant for steam generator deposit control in the secondary system of Arkansas Nuclear One Unit 2 (ANO-2).

2001-09-24T23:59:59.000Z

352

Simulation of Stability Analysis for Distribution Systems with Dispersed Generation Using Matlab/Simulink.  

E-Print Network (OSTI)

??This thesis is to investigate the voltage sag, transient stability and operation feasibility of power islanding with different types of dispersed generation in distribution systems.… (more)

Huang, Kun-Cyuan

2005-01-01T23:59:59.000Z

353

Evaluation of Fire Dynamics Simulator for Liquefied Natural Gas Vapor Dispersion Hazards.  

E-Print Network (OSTI)

??The Federal Energy Regulatory Commission (FERC) and Pipeline and Hazardous Material Administration (PHMSA) require vapor dispersion modeling as part of a siting analysis for liquefied… (more)

Kohout, Andrew Joseph

2011-01-01T23:59:59.000Z

354

Evaluation of fire dynamics simulator for liquefied natural gas vapor dispersion hazards.  

E-Print Network (OSTI)

?? The Federal Energy Regulatory Commission (FERC) and Pipeline and Hazardous Material Administration (PHMSA) require vapor dispersion modeling as part of a siting analysis for… (more)

Kohout, Andrew Joseph

2012-01-01T23:59:59.000Z

355

(ALE) Method for Thermal and Dispersed-Phase Analysis of Nano ...  

Science Conference Proceedings (OSTI)

This study relates to the enhancement of cooling properties of Nano fluid for various cooling system, where dispersion of Nano particles play a major character.

356

Fluid Flow, Alloy Dispersion and Inclusion Motion in Argon-stirred ...  

Science Conference Proceedings (OSTI)

Alloy dispersion and inclusion motion in the molten steel were investigated. The melting ... Decomposition of Methane during Oxide Reduction Using Natural gas.

357

Extended macroscopic dispersion model with applications to confined packed beds and capillary column inverse gas chromatography.  

E-Print Network (OSTI)

??Until present, many researchers relied on the conventional plug flow dispersion models to analyse the concentration profiles obtained from the tracer injection experiments to evaluate… (more)

Hamdan, Emad

2008-01-01T23:59:59.000Z

358

Yittria and Alumina Nano-scale Oxide-dispersion-strengthened (ODS)  

Science Conference Proceedings (OSTI)

Effect of Oxide Dispersion Strengthening on Spark Plasma Sintering Kinetics of 13Cr-2Mo ... Synthesis of TiN Nanorods by Thermal Decomposition of Solid/Gas

359

The Development of a Non-Equilibrium Dispersed Flow Film Boiling Heat Transfer Modeling Package.  

E-Print Network (OSTI)

??The dispersed flow film boiling (DFFB) heat transfer regime is important to several applications including cryogenics, rocket engines, steam generators, and in the safety analysis… (more)

Meholic, Michael

2011-01-01T23:59:59.000Z

360

Origin of Tough Behavior in Short Carbon Fiber Dispersed SiC ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Short carbon fiber-dispersed SiC matrix composites have been used for advanced ... Ceramic Matrix Composites for Nuclear and Fusion Energy.

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

The Oklahoma Dispersion Model: Using the Gaussian Plume Model as an Operational Management Tool for Determining Near-Surface Dispersion Conditions across Oklahoma  

Science Conference Proceedings (OSTI)

The Oklahoma Dispersion Model (ODM) represents a current innovative application of the classic Gaussian plume model in an operational setting. Utilizing a statewide mesoscale automated weather station network (the Oklahoma Mesonet) for current ...

J. D. Carlson; Derek S. Arndt

2008-02-01T23:59:59.000Z

362

SURFACE-MODIFIED COALS FOR ENHANCED CATALYST DISPERSION AND LIQUEFACTION  

SciTech Connect

This is the final report of the Department of Energy Sponsored project DE-FGF22-95PC95229 entitled, surface modified coals for enhanced catalyst dispersion and liquefaction. The aims of the study were to enhance catalyst loading and dispersion in coal for improved liquefaction by preadsorption of surfactants and catalysts on the coal and to train and educate minority scientists in catalysts and separation science. Illinois No. 6 Coal (DEC-24) was selected for the study. The surfactants investigated included dodecyl dimethyl ethyl ammonium bromide (DDAB), a cationic surfactant, sodium dodecyl sulfate, an anionic surfactant, and Triton x-100, a neutral surfactant. Ammonium molybdate tetrahydrate was used as the molybdenum catalyst precursor. Zeta potential, BET, FTIR, AFM, UV-Vis and luminescence intensity measurements were undertaken to assess the surface properties and the liquefaction activities of the coal. The parent coal had a net negative surface charge over the pH range 2-12. However, in the presence of DDAB the negativity of the surface charge decreased. At higher concentrations of DDAB, a positive surface charge resulted. In contrast to the effect of DDAB, the zeta potential of the coal became more negative than the parent coal in the presence of SDS. Adsorption of Triton reduced the net negative charge density of the coal samples. The measured surface area of the coal surface was about 30 m{sup 2}/g compared to 77m{sup 2}/g after being washed with deionized water. Addition of the surfactants decreased the surface area of the samples. Adsorption of the molybdenum catalyst increased the surface area of the coal sample. The adsorption of molybdenum on the coal was significantly promoted by preadsorption of DDAB and SDS. Molybdenum adsorption showed that, over a wide range of concentrations and pH values, the DDAB treated coal adsorbed a higher amount of molybdenum than the samples treated with SDS. The infrared spectroscopy (FTIR) and the atomic force microscopy (AFM) also provided evidence that confirmed the adsorption of the surfactants onto the coal surface. The luminescence measurements showed that the coal and solid surfactants luminescence weakly. No statistically significant influence was observed that resulted from the action of the surfactants or surfactant-molybdenum catalyst. Interestingly, the liquefaction results produced data that indicated the use of surfactants did not significantly improve the liquefaction activity of the coal as had initially been hypothesized. The UV-adsorption tests provided evidence that suggest that this may have been due to oversaturation. Detailed discussions of the results and recommendations for future work are provided.

Dr. Yaw D. Yeboah

1999-09-01T23:59:59.000Z

363

Surface modified coals for enhanced catalyst dispersion and liquefaction  

SciTech Connect

The aim of the study is to enhance catalyst loading and dispersion in coal for improved liquefaction by preadsorption of surfactants and catalysts on to the coal. During this reporting period, zeta potential measurements were conducted to assess the surface charge on the raw, pretreated and catalyzed coal samples. The surface area, transmission spectroscopy and luminescence intensity of the raw coal and pretreated coal samples were also determined to assess the quality of the coal surface. Across a broad range of pH values, the raw coal had an overall negative charge. Coal treated with anionic surfactant SDS maintained an overall net negative surface negative charge. The interaction between the coal and cationic surfactant DDAB caused the opposite effect resulting in a more positive coal surface charge. Although one would have expected little or no effect of the neutral surfactant Triton X-100, there appears to be some difference in the results of the raw coal and the coal treated with Triton X-100. The authors believe that the Triton not only binds to the nonpolar sites but also has a strong affinity for the polar sites through electrostatic bonding and interaction between the hydrophobic tails. The addition of molybdenum to coal pretreated with DDAB caused a reduction in the positive charge of the coal surface probably due to possible ionic interaction between the coal surface, the surfactant and the catalyst. The adsorption isotherm of the coal was characteristic of isotherms for porous samples and the surface area of the coal increased from 30 m{sup 2}/g to 77 m{sup 2}/g when washed with deionized water. This suggests coal washing may be one method of increasing the surface area for surfactant adsorption. Although the transmission measurements provided valuable information about the coal it resulted in little information on the amount of adsorbed Triton. However, the maximum solid-liquid ratio for optimum surfactant loading of Triton X-100 was determined via the UV-Vis spectrophotometer. The luminescence intensity measurements showed that the coal and surfactants luminescence weakly. No statistically significant influence was observed from the actions of the surfactants or surfactant-molybdenum catalyst. Qualitative inspection however, showed that SDS might effectively coat coal surfaces and influence catalyst dispersion. Also, catalysts appeared to be better distributed among coal particles and in finer clusters when DDAB and Triton surfactants were used.

Dr. Yaw D. Yeboah

1998-10-29T23:59:59.000Z

364

Bayesian Network Analysis of Radiological Dispersal Device Acquisitions  

E-Print Network (OSTI)

It remains unlikely that a terrorist organization could produce or procure an actual nuclear weapon. However, the construction of a radiological dispersal device (RDD) from commercially produced radioactive sources and conventional explosives could inflict moderate human casualties and significant economic damage. The vast availability of radioactive sources and the nearly limitless methods of dispersing them demand an inclusive study of the acquisition pathways for an RDD. A complete network depicting the possible acquisition pathways for an RDD could be subjected to predictive modeling in order to determine the most likely pathway an adversary might take. In this work, a comprehensive network of RDD acquisition pathways was developed and analyzed utilizing the Bayesian network analysis software, Netica. The network includes variable inputs and motivations that can be adjusted to model different adversaries. Also, the inclusion of evidence nodes facilitates the integration of real-time intelligence with RDD plot predictions. A sensitivity analysis was first performed to determine which nodes had the greatest impact on successful completion of RDD acquisition. These results detail which portions of the acquisition pathways are most vulnerable to law enforcement intervention. Next, a series of case studies was analyzed that modeled specific adversarial organizations. The analysis demonstrates various features of the constructed Bayesian RDD acquisition network and provides examples of how this tool can be utilized by intelligence analysts and law enforcement agencies. Finally, extreme cases were studied in which the adversary was given the maximum and minimum amount of resources in order to determine the limitations of this model. The aggregated results show that successful RDD acquisition is mostly dependent on the adversary’s resources. Furthermore, the network suggests that securing radiological materials has the greatest effect on interdicting possible RDD plots. Limitations of this work include a heavy dependence on conditional probabilities that were derived from intuition, as opposed to actual historical data which does not exist. However, the model can be updated as attempted or successful RDD plots emerge in the future. This work presents the first probabilistic model of RDD acquisition pathways that integrates adversary motivations and resources with evidence of specific RDD threats.

Hundley, Grant Richard

2010-12-01T23:59:59.000Z

365

Ensemble modeling of transport and dispersion simulations guided by machine learning hypotheses generation  

Science Conference Proceedings (OSTI)

In this article an approach is presented where machine learning classifiers are used to drive an ensemble modeling method of multiple atmospheric transport and dispersion simulations. The goal is to achieve a higher spread of the results with a lower ... Keywords: Ensemble modeling, Machine learning, Transport and dispersion simulations

Andreas D. Lattner; Guido Cervone

2012-11-01T23:59:59.000Z

366

Axial dispersion in segmented gas-liquid flow: Effects of alternating channel curvature  

E-Print Network (OSTI)

Axial dispersion in segmented gas-liquid flow: Effects of alternating channel curvature Metin of channel curvature on the axial dispersion in segmented gas-liquid flows are studied computationally.1063/1.3531742 I. INTRODUCTION Segmented gas-liquid flow also known as Taylor flow has been studied extensively

Muradoglu, Metin

367

Highly dispersed carbon nanotubes in organic media for polymer:fullerene photovoltaic devices  

E-Print Network (OSTI)

Highly dispersed carbon nanotubes in organic media for polymer:fullerene photovoltaic devices Gwang photovoltaic device are fabricated using homogeneously dispersed carbon nanotubes (CNTs) in a polymer and by the fabrica- tion of an organic thin film transistor. An organic solar cell was fabricated from these com

Hong, Soon Hyung

368

Dispersion measurement as a method of quantifying geologic characterization and defining reservoir heterogeneity. Final report  

Science Conference Proceedings (OSTI)

The main objective of this research project is to investigate dispersion as a method of quantifying geological characterization and defining reservoir heterogeneity in order to enhance crude oil recovery. The dispersion of flow of a reservoir rock (dispersion coefficient and dispersivity) was identified as one of the physical properties of a reservoir rock by measuring the mixing of two miscible fluids, one displacing the other in a porous medium. A rock was 100% saturated with a resident fluid and displaced by a miscible fluid of equal viscosity and equal density. Some specific experiments were performed with unequal densities. Produced fluid was analyzed by refractometer, nuclear reaction, electrical conductivity and X-ray scan. Several physical and flow characteristics were measured on the sand rock sample in order to establish correlations with the measured dispersion property. Absolute permeability, effective porosity, relative permeability, capillary pressure, the heterogeneity factor and electrical conductivity were used to better understand the flow system. Linear, transverse, 2-D and 3-D dispersions were measured and used to characterize the rock heterogeneity of the flow system. A new system of measuring dispersion was developed using a gas displacing gas system in a porous medium. An attempt was also made to determine the dispersion property of an actual reservoir from present day well log data on a producing well. 275 refs., 102 figs., 17 tabs.

Menzie, D.E.

1995-05-01T23:59:59.000Z

369

Least-Squares Spectral Method for the solution of a fractional advection-dispersion equation  

Science Conference Proceedings (OSTI)

Fractional derivatives provide a general approach for modeling transport phenomena occurring in diverse fields. This article describes a Least Squares Spectral Method for solving advection-dispersion equations using Caputo or Riemann-Liouville fractional ... Keywords: Advection-dispersion, Anomalous diffusion, Anomalous transport, Caputo derivative, Fractional derivative, Least-Squares, Riemann-Liouville derivative, Riesz derivative, Spectral Method

Alfredo RaúL Carella; Carlos Alberto Dorao

2013-01-01T23:59:59.000Z

370

Spatial resolution of a GEM readout TPC using the charge dispersion signal  

E-Print Network (OSTI)

Spatial resolution of a GEM readout TPC using the charge dispersion signal K. Boudjemline a , M. S and channels of electronics, Micro Pattern Gas Detectors (MPGD) are being developed which could use pads with 2 mm x 6 mm pads using the new concept of charge dispersion in MPGDs with a resistive anode

371

Physical Aging and Phase Behavior of Multiresponsive Microgel Colloidal Dispersions Zhiyong Meng,  

E-Print Network (OSTI)

Physical Aging and Phase Behavior of Multiresponsive Microgel Colloidal Dispersions Zhiyong Meng. These studies reveal an extreme degree of complexity in the physical aging and phase behavior of the dispersions into rectangular capillary tubes, to very slow crystalline or glassy phases after days or weeks of aging

Breedveld, Victor

372

Update 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

3 to: A Dispersion Modeling Analysis of Downwash from 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together Update 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together Docket No. EO-05-01. Docket No. EO-05-01. This report describes dispersion modeling performed for Units 1 and 4 at Mirant's Potomac River Generating Station. The purpose of the modeling was to demonstrate that Units 1 and 4, operating together under specific loads and during certain periods in a calendar day will not cause or contribut to excceedences of the National Ambient Air Quality Standards (NAAQS). Update 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together

373

Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

4 to: A Dispersion Modeling Analysis of Downwash from 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 4 Emissions at Maximum and Minimum Loads Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 4 Emissions at Maximum and Minimum Loads Docket No. EO-05-01. This report describes dispersion modeling performed for Unit 4 at Mirant's Potomac River Generating Station. The modeling was performed according to the Protocol approved by the Virginia Deparment of Environmental Quality. The purpose of the modeling was to demonstrate that Unit 4, operating alone under minimum and maximum loads will not cause or contribute to exceedances of the National Ambient Air Quality Standards (NAAQS). Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's

374

Liquid-phase dispersion during injection into vapor-dominated reservoirs  

DOE Green Energy (OSTI)

The behavior of water injection plumes in vapor-dominated reservoirs is examined. Stressing the similarity to water infiltration in heterogeneous soils, we suggest that ever-present heterogeneities in individual fractures and fracture networks will cause a lateral broadening of descending injection plumes. The process of lateral spreading of liquid phase is viewed in analogy to transverse dispersion in miscible displacement. To account for the postulated ``phase dispersion`` the conventional two-phase immiscible flow theory is extended by adding a Fickian-type dispersive term. The validity of the proposed phase dispersion model is explored by means of simulations with detailed resolution of small-scale heterogeneity. We also present an illustrative application to injection into a depleted vapor zone. It is concluded that phase dispersion effects will broaden descending injection plumes, with important consequences for pressure support and potential water breakthrough at neighboring production wells.

Pruess, K.

1994-01-01T23:59:59.000Z

375

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah,  

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

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 More Documents & Publications Final Report Phase II: Performance Evaluation of Permeable Reactive Barriers and Potential for Rejuvenation by Chemical Flushing Phase II: Performance Evaluation of Permeable Reactive Barriers and Potential for Rejuvenation by Chemical Flushing Third (March 2006) Coring and Analysis of Zero-Valent Iron Permeable

376

Catalyst dispersion and activity under conditions of temperature- staged liquefaction  

DOE Green Energy (OSTI)

The general objectives of this research are (1) to investigate the use of highly dispersed catalysts for the pretreatment of coal by mild hydrogenation, (2) to identify the active forms of the catalysts under reaction conditions and (3) to clarify the mechanisms of catalysis. The ultimate objective is to ascertain if mild catalytic hydrogenation resulting in very limited or no coal solubilization is an advantageous pretreatment for the transformation of coal into transportable fuels. The experimental program will focus upon the development of effective methods of impregnating coal with catalysts, evaluating the conditions under which the catalysts are most active and establishing the relative impact of improved impregnation on conversion and product distributions obtained from coal hydrogenation. Liquefaction experiments of solvent-treated and untreated Blind Canyon (DECS-6) and Texas lignite (DECS-1) have been performed using ammonium tetrathiomolybdate (ATTM) and bis (dicarbonylcyclopentadienyl) iron (CPI) as catalyst precursors using temperature-staged conditions (275{degrees}C, 30 min; 425{degrees}C, 30 min). Solid state {sup 13}C NMR analysis was carried out for each coal and for selected residues. 12 refs., 14 figs., 9 tabs.

Davis, A.; Schobert, H.H.; Mitchell, G.D.; Artok, L.

1991-09-01T23:59:59.000Z

377

Particle dispersing system and method for testing semiconductor manufacturing equipment  

DOE Patents (OSTI)

The system and method prepare a gas stream comprising particles at a known concentration using a particle disperser for moving particles from a reservoir of particles into a stream of flowing carrier gas. The electrostatic charges on the particles entrained in the carrier gas are then neutralized or otherwise altered, and the resulting particle-laden gas stream is then diluted to provide an acceptable particle concentration. The diluted gas stream is then split into a calibration stream and the desired output stream. The particles in the calibration stream are detected to provide an indication of the actual size distribution and concentration of particles in the output stream that is supplied to a process chamber being analyzed. Particles flowing out of the process chamber within a vacuum pumping system are detected, and the output particle size distribution and concentration are compared with the particle size distribution and concentration of the calibration stream in order to determine the particle transport characteristics of a process chamber, or to determine the number of particles lodged in the process chamber as a function of manufacturing process parameters such as pressure, flowrate, temperature, process chamber geometry, particle size, particle charge, and gas composition.

Chandrachood, Madhavi (Sunnyvale, CA); Ghanayem, Steve G. (Sunnyvale, CA); Cantwell, Nancy (Milpitas, CA); Rader, Daniel J. (Albuquerque, NM); Geller, Anthony S. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

378

Surface Modified Coals for Enhanced Catalyst Dispersion and Liquefaction  

SciTech Connect

The aim of this study is to enhance catalyst loading and dispersion in coal for improved liquefaction by preadsorption of surfactants and catalysts on to the coal. During this reporting period, liquefaction experiments were conducted with the raw coal and catalyst loaded samples. Pretreatment of the coal and catalyst-loaded samples were done using the surfactants presented in previous reports. Liquefaction samples were tested using 6.6 g of solvent, 3.3 g coal, 6.9 MPa ambient hydrogen pressure, 425 0 C and 30 minutes. The liquid and solid products were removed from the reactor using tetrahydrofuran (THF). Coal conversions were calculated based on THF and heptane solubility. The results showed that in the absence of a catalyst, 33.8% heptane solubles was obtained with the parent coal compared to 27.8% and 27.3% with the SDS and DDAB surfactants. The presence of molybdenum, as expected, resulted in enhanced heptane solubles with or without surfactants. In the absence of surfactants, 50% heptane solubles was obtained compared to 40-47% with surfactants. Thus, it appears that pretreatment, unexpectedly, had a negative effect on liquefaction activity. It is unclear if the observed differences in results are significant. Clearly, additional experiments are needed before any firm deductions and conclusions can be drawn from the results.

Yaw D. Yeboah

1998-12-04T23:59:59.000Z

379

Simulation of spray dispersion in a simplified heavy vehicle wake  

SciTech Connect

Simulations of spray dispersion in a simplified tractor-trailer wake have been completed with the goal of obtaining a better understanding of how to mitigate this safety hazard. The Generic Conventional Model (GCM) for the tractor-trailer was used. The impact of aerodynamic drag reduction devices, specifically trailer-mounted base flaps, on the transport of spray in the vehicle wake was considered using the GCM. This analysis demonstrated that base flaps including a bottom plate may actually worsen motorist visibility because of the interaction of fine spray with large vortex flows in the wake. This work suggests that to use computational fluid dynamics (CFD) to design and evaluate spray mitigation strategies the jet or sheet breakup processes can be modeled using an array of injectors of small (< 0.1 mm) water droplets; however the choice of size distribution, injection locations, directions and velocities is largely unknown and requires further study. Possible containment strategies would include using flow structures to 'focus' particles into regions away from passing cars or surface treatments to capture small drops.

Paschkewitz, J S

2006-01-13T23:59:59.000Z

380

On the dispersion of two coexisting nongyrotropic ion species  

E-Print Network (OSTI)

Abstract. Space observations in the solar wind and simulations of high Mach number bow-shocks have detected particle populations with two coexisting nongyrotropic ion species. We investigate the in¯uence of these two sources of free energy on the stability of parallel (with respect to the ambient magnetic ®eld) and perpendicular propagation. For parallel modes, we derive their dispersion equation in a magnetoplasma with protons and alpha particles that may exhibit stationary nongyrotropy (SNG) and discuss the characteristics of its solutions. Kinetic simulations study the behaviour of perpendicular electrostatic (Bernstein-like) waves in a plasma whose ion populations (positrons and ®ctitious singly-charged particles with twice the electron mass, for the sake of simulation feasability) can be timevarying nongyrotropic (TNG). The results show that the coexistence of two gyrophase bunched species does not signi®cantly enhance the parallel SNG instability already found for media with only one nongyrotropic species, whereas it strongly intensi®es the growth of Bernstein-like modes in TNG plasmas. Key words. Magnetospheric physics (plasma waves and instabilities) á Space plasma physics (numerical simulation studies; waves and instabilities) 1

A. L. Brinca; U. Motschmann; F. J. Romeiras

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Dispersal and fallout simulations for urban consequences management (u)  

SciTech Connect

Hazardous chemical, biological, or radioactive releases from leaks, spills, fires, or blasts, may occur (intentionally or accidentally) in urban environments during warfare or as part of terrorist attacks on military bases or other facilities. The associated contaminant dispersion is complex and semi-chaotic. Urban predictive simulation capabilities can have direct impact in many threat-reduction areas of interest, including, urban sensor placement and threat analysis, contaminant transport (CT) effects on surrounding civilian population (dosages, evacuation, shelter-in-place), education and training of rescue teams and services. Detailed simulations for the various processes involved are in principle possible, but generally not fast. Predicting urban airflow accompanied by CT presents extremely challenging requirements. Crucial technical issues include, simulating turbulent fluid and particulate transport, initial and boundary condition modeling incorporating a consistent stratified urban boundary layer with realistic wind fluctuations, and post-processing of the simulation results for practical consequences management. Relevant fluid dynamic processes to be simulated include, detailed energetic and contaminant sources, complex building vortex shedding and flows in recirculation zones, and modeling of particle distributions, including particulate fallout, as well as deposition, re-suspension and evaporation. Other issues include, modeling building damage effects due to eventual blasts, addressing appropriate regional and atmospheric data reduction.

Grinstein, Fernando F [Los Alamos National Laboratory; Wachtor, Adam J [Los Alamos National Laboratory; Nelson, Matt [Los Alamos National Laboratory; Brown, Michael [Los Alamos National Laboratory; Bos, Randy [Los Alamos National Laboratory; Patnik, Gopal [US NAVAL RESEARCH LAB.

2010-01-01T23:59:59.000Z

382

Oxide Dispersion Strengthened Iron Aluminide by CVD Coated Powders  

SciTech Connect

This I &I Category2 program developed chemical vapor deposition (CVD) of iron, aluminum and aluminum oxide coated iron powders and the availability of high temperature oxidation, corrosion and erosion resistant coating for future power generation equipment and can be used for retrofitting existing fossil-fired power plant equipment. This coating will provide enhanced life and performance of Coal-Fired Boilers components such as fire side corrosion on the outer diameter (OD) of the water wall and superheater tubing as well as on the inner diameter (ID) and OD of larger diameter headers. The program also developed a manufacturing route for readily available thermal spray powders for iron aluminide coating and fabrication of net shape component by powder metallurgy route using this CVD coated powders. This coating can also be applid on jet engine compressor blade and housing, industrial heat treating furnace fixtures, magnetic electronic parts, heating element, piping and tubing for fossil energy application and automotive application, chemical processing equipment , heat exchanger, and structural member of aircraft. The program also resulted in developing a new fabrication route of thermal spray coating and oxide dispersion strengthened (ODS) iron aluminide composites enabling more precise control over material microstructures.

Asit Biswas Andrew J. Sherman

2006-09-25T23:59:59.000Z

383

Acoustic dispersion in a two-dimensional dipole system  

Science Conference Proceedings (OSTI)

We calculate the full density response function and from it the long-wavelength acoustic dispersion for a two-dimensional system of strongly coupled point dipoles interacting through a 1/r{sup 3} potential at arbitrary degeneracy. Such a system has no random-phase-approximation (RPA) limit and the calculation has to include correlations from the outset. We follow the quasilocalized charge (QLC) approach, accompanied by molecular-dynamics (MD) simulations. Similarly to what has been recently reported for the closely spaced classical electron-hole bilayer [G. J. Kalman et al., Phys. Rev. Lett. 98, 236801 (2007)] and in marked contrast to the RPA, we report a long-wavelength acoustic phase velocity that is wholly maintained by particle correlations and varies linearly with the dipole moment p. The oscillation frequency, calculated both in an extended QLC approximation and in the Singwi-Tosi-Land-Sjolander approximation [Phys. Rev. 176, 589 (1968)], is invariant in form over the entire classical to quantum domains all the way down to zero temperature. Based on our classical MD-generated pair distribution function data and on ground-state energy data generated by recent quantum Monte Carlo simulations on a bosonic dipole system [G. E. Astrakharchik et al., Phys. Rev. Lett. 98, 060405 (2007)], there is a good agreement between the QLC approximation kinetic sound speeds and the standard thermodynamic sound speeds in both the classical and quantum domains.

Golden, Kenneth I.; Kalman, Gabor J.; Donko, Zoltan; Hartmann, Peter [Department of Mathematics and Statistics, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, Vermont 05401-1455 (United States); Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467 (United States); Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest (Hungary)

2008-07-15T23:59:59.000Z

384

Tensor polarizability and dispersive quantum measurement of multilevel atoms  

E-Print Network (OSTI)

Optimally extracting information from measurements performed on a physical system requires an accurate model of the measurement interaction. Continuously probing the collective spin of an Alkali atom cloud via its interaction with an off-resonant optical probe is an important example of such a measurement where realistic modeling at the quantum level is possible using standard techniques from atomic physics. Typically, however, tutorial descriptions of this technique have neglected the multilevel structure of realistic atoms for the sake of simplification. In this paper we account for the full multilevel structure of Alkali atoms and derive the irreducible form of the polarizability Hamiltonian describing a typical dispersive quantum measurement. For a specific set of parameters, we then show that semiclassical predictions of the theory are consistent with our experimental observations of polarization scattering by a polarized cloud of laser-cooled Cesium atoms. We also derive the signal-to-noise ratio under a single measurement trial and use this to predict the rate of spin-squeezing with multilevel Alkali atoms for arbitrary detuning of the probe beam.

JM Geremia; John K. Stockton; Hideo Mabuchi

2005-01-07T23:59:59.000Z

385

Viscosity of alumina nanoparticles dispersed in car engine coolant  

Science Conference Proceedings (OSTI)

The present paper, describes our experimental results on the viscosity of the nanofluid prepared by dispersing alumina nanoparticles (car coolant. The nanofluid prepared with calculated amount of oleic acid (surfactant) was tested to be stable for more than 80 days. The viscosity of the nanofluids is measured both as a function of alumina volume fraction and temperature between 10 and 50 C. While the pure base fluid display Newtonian behavior over the measured temperature, it transforms to a non-Newtonian fluid with addition of a small amount of alumina nanoparticles. Our results show that viscosity of the nanofluid increases with increasing nanoparticle concentration and decreases with increase in temperature. Most of the frequently used classical models severely under predict the measured viscosity. Volume fraction dependence of the nanofluid viscosity, however, is predicted fairly well on the basis of a recently reported theoretical model for nanofluids that takes into account the effect of Brownian motion of nanoparticles in the nanofluid. The temperature dependence of the viscosity of engine coolant based alumina nanofluids obeys the empirical correlation of the type: log ({mu}{sub nf}) = A exp(BT), proposed earlier by Namburu et al. (author)

Kole, Madhusree; Dey, T.K. [Thermophysical Measurements Laboratory, Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302 (India)

2010-09-15T23:59:59.000Z

386

Federal Response Assets for a Radioactive Dispersal Device Incident  

SciTech Connect

If a large scale RDD event where to occur in New York City, the magnitude of the problem would likely exceed the capabilities of City and State to effectively respond to the event. New York State could request Federal Assistance if the United States President has not already made the decision to provide it. The United States Federal Government has a well developed protocol to respond to emergencies. The National Response Framework (NRF) describes the process for responding to all types of emergencies including RDD incidents. Depending on the location and type of event, the NRF involves appropriate Federal Agencies, e.g., Department of Homeland Security (DHS), the Department of Energy (DOE), Environmental Protection Agency (EPA), United States Coast Guard (USCG), Department of Defense (DOD), Department of Justice (DOJ), Department of Agriculture (USDA), and Nuclear Regulatory Commission (NRC). The Federal response to emergencies has been refined and improved over the last thirty years and has been tested on natural disasters (e.g. hurricanes and floods), man-made disasters (oil spills), and terrorist events (9/11). However, the system has never been tested under an actual RDD event. Drills have been conducted with Federal, State, and local agencies to examine the initial (early) phases of such an event (TopOff 2 and TopOff 4). The Planning Guidance for Protection and Recovery Following Radiological Dispersal Device (RDD) and Improvised Nuclear Device (IND) incidents issued by the Department of Homeland Security (DHS) in August 2008 has never been fully tested in an interagency exercise. Recently, another exercise called Empire 09 that was situated in Albany, New York was conducted. Empire 09 consists of 3 different exercises be held in May and June, 2009. The first exercise, May 2009, involved a table top exercise for phase 1 (0-48 hours) of the response to an RDD incident. In early June, a full-scale 3- day exercise was conducted for the mid-phase response (48 hours +). A few weeks later, a one day full-scale exercise was conducted for the late phase (recovery) response to an RDD event. The lessons learned from this study are not available as of June 30, 2009. The objective of this report is to review and summarize anticipated Federal and State response actions and the roles and responsibilities of various agencies (DHS, EPA, DOE, NY-DEP, NY-DEC) with respect to decontamination issues that would arise from a radiological dispersion device (RDD), e.g., dirty bomb attack. These issues arise in the late phase of the response (48 hours and beyond) after the area has been stabilized and forensic information has been obtained. Much of the information provided in this report is taken directly from published guidance that is readily available.

Sullivan,T.

2009-06-30T23:59:59.000Z

387

Enhanced dispersion interaction between quasi-one dimensional conducting collinear structures  

E-Print Network (OSTI)

Recent investigations have highlighted the failure of a sum of $R^{-6}$ terms to represent the dispersion interaction in parallel metallic, anisotropic, linear or planar nanostructures [J. F. Dobson, A. White, and A. Rubio, Phys. Rev. Lett. 96, 073201 (2006) and references therein]. By applying a simple coupled plasmon approach and using electron hydrodynamics, we numerically evaluate the dispersion (non-contact van der Waals) interaction between two conducting wires in a collinear pointing configuration. This case is compared to that of two insulating wires in an identical geometry, where the dispersion interaction is modelled both within a pairwise summation framework, and by adding a pinning potential to our theory leading to a standard oscillator-type model of insulating dielectric behavior. Our results provide a further example of enhanced dispersion interaction between two conducting nanosystems compared to the case of two insulating ones. Unlike our previous work, this calculation explores a region of relatively close coupling where, although the electronic clouds do not overlap, we are still far from the asymptotic region where a single power law describes the dispersion energy. We find that strong differences in dispersion attraction between metallic and semiconducting / insulating cases persist into this non-asymptotic region. While our theory will need to be supplemented with additional short-ranged terms when the electronic clouds overlap, it does not suffer from the short-distance divergence exhibited by purely asymptotic theories, and gives a natural saturation of the dispersion energy as the wires come into contact.

Angela White; John F. Dobson

2006-09-25T23:59:59.000Z

388

Heavy Element Dispersion in the Metal-Poor Globular Cluster M92  

E-Print Network (OSTI)

Dispersion among the light elements is common in globular clusters (GCs), while dispersion among heavier elements is less common. We present detection of r-process dispersion relative to Fe in 19 red giants of the metal-poor GC M92. Using spectra obtained with the Hydra multi-object spectrograph on the WIYN Telescope at Kitt Peak National Observatory, we derive differential abundances for 21 species of 19 elements. The Fe-group elements, plus Y and Zr, are homogeneous at a level of 0.07-0.16 dex. The heavy elements La, Eu, and Ho exhibit clear star-to-star dispersion spanning 0.5-0.8 dex. The abundances of these elements are correlated with one another, and we demonstrate that they were produced by r-process nucleosynthesis. This r-process dispersion is not correlated with the dispersion in C, N, or Na in M92, indicating that r-process inhomogeneities were present in the gas throughout star formation. The r-process dispersion is similar to that previously observed in the metal-poor GC M15, but its origin in M...

Roederer, Ian U

2011-01-01T23:59:59.000Z

389

HEAVY-ELEMENT DISPERSION IN THE METAL-POOR GLOBULAR CLUSTER M92  

SciTech Connect

Dispersion among the light elements is common in globular clusters (GCs), while dispersion among heavier elements is less common. We present detection of r-process dispersion relative to Fe in 19 red giants of the metal-poor GC M92. Using spectra obtained with the Hydra multi-object spectrograph on the WIYN Telescope at Kitt Peak National Observatory, we derive differential abundances for 21 species of 19 elements. The Fe-group elements, plus Y and Zr, are homogeneous at a level of 0.07-0.16 dex. The heavy-elements La, Eu, and Ho exhibit clear star-to-star dispersion spanning 0.5-0.8 dex. The abundances of these elements are correlated with one another, and we demonstrate that they were produced by r-process nucleosynthesis. This r-process dispersion is not correlated with the dispersion in C, N, or Na in M92, indicating that r-process inhomogeneities were present in the gas throughout star formation. The r-process dispersion is similar to that previously observed in the metal-poor GC M15, but its origin in M15 or M92 is unknown at present.

Roederer, Ian U. [Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Sneden, Christopher, E-mail: iur@obs.carnegiescience.edu [Department of Astronomy, University of Texas at Austin, 1 University Station, C1400, Austin, TX 78712 (United States)

2011-07-15T23:59:59.000Z

390

Stock returns and the dispersion in earnings forecasts,” Working Paper No  

E-Print Network (OSTI)

Abstract: The efficient market hypothesis based on homogeneous expectations implies that future stock returns are unpredictable. However, the forecastability of stock returns has been well documented in a substantial literature. This paper introduces a new forecasting variable, dispersion in analysts ’ earnings forecasts. The implication from this finding is not only that we have another piece of evidence that stock returns are predictable, but also that alternative models should be used to explain movements of stock prices. Hence, this paper derives a relation between the dispersion in forecasts and future stock returns based on Harrison and Kreps (1978) and shows that the dispersion in forecasts exerts its own positive effect on demand in the market. Furthermore, this paper shows empirically that the dispersion in expectations has particularly strong predictive power for future stock returns at intermediate horizons (between 24 months and 43 months) and that it contains information about future stock returns aside from the information contained in other variables. In addition, the direction of predictive power from the dispersion for future stock returns is consistent with the derived relation from Harrison and Kreps (1978). This paper also shows that most of the movements in dispersion cannot be explained by other variables, such as common financial indicators, macroeconomic variables, market volatility, or non-economic events. Finally, Monte Carlo simulation shows that finite sample biases in long-horizon regressions using the dispersion do not seem so serious.

Cheolbeom Park

2001-01-01T23:59:59.000Z

391

Dispersion relation for pure dust Bernstein waves in a non-Maxwellian magnetized dusty plasma  

SciTech Connect

Pure dust Bernstein waves are investigated using non-Maxwellian kappa and (r,q) distribution functions in a collisionless, uniform magnetized dusty plasma. Dispersion relations for both the distributions are derived by considering waves whose frequency is of the order of dust cyclotron frequency, and dispersion curves are plotted. It is observed that the propagation band for dust Bernstein waves is rather narrow as compared with that of the electron Bernstein waves. However, the band width increases for higher harmonics, for both kappa and (r,q) distributions. Effect of dust charge on dispersion curves is also studied, and one observes that with increasing dust charge, the dispersion curves shift toward the lower frequencies. Increasing the dust to ion density ratio ((n{sub d0}/n{sub i0})) causes the dispersion curve to shift toward the higher frequencies. It is also found that for large values of spectral index kappa ({kappa}), the dispersion curves approach to the Maxwellian curves. The (r,q) distribution approaches the kappa distribution for r = 0, whereas for r > 0, the dispersion curves show deviation from the Maxwellian curves as expected. Relevance of this work can be found in astrophysical plasmas, where non-Maxwellian velocity distributions as well as dust particles are commonly observed.

Deeba, F. [National Tokamak Fusion Program, PAEC, P.O. Box 3329, Islamabad 44000 (Pakistan); Department of Physics, G.C. University, Lahore 54000 (Pakistan); Ahmad, Zahoor [National Tokamak Fusion Program, PAEC, P.O. Box 3329, Islamabad 44000 (Pakistan); Murtaza, G. [Salam Chair in Physics, G.C. University, Lahore 54000 (Pakistan)

2011-07-15T23:59:59.000Z

392

A Large-Eddy Simulation Study of Bottom Heating Effects on Scalar Dispersion in and above a Cubical Building Array  

Science Conference Proceedings (OSTI)

Thermal effects on scalar dispersion in and above a cubical building array are numerically investigated using the parallelized large-eddy simulation model (PALM). Two cases (no heating and bottom heating) are simulated, and scalar dispersion ...

Seung-Bu Park; Jong-Jin Baik; Young-Hee Ryu

393

An LES Study of the Impacts of Land Surface Heterogeneity on Dispersion in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A systematic analysis of the impacts of heat patches and topographical features on the dispersion of passive materials in a shear-free convective boundary layer (CBL) was performed. Large eddy simulations and a Lagrangian particle dispersion ...

S. G. Gopalakrishnan; Roni Avissar

2000-01-01T23:59:59.000Z

394

LEP Center-of-Mass Energies in Presence of Opposite Sign Vertical Dispersion in Bunch-Train Operation  

E-Print Network (OSTI)

LEP Center-of-Mass Energies in Presence of Opposite Sign Vertical Dispersion in Bunch-Train Operation

CERN. Geneva

1995-01-01T23:59:59.000Z

395

On the application of computational fluid dynamics codes for liquefied natural gas dispersion.  

SciTech Connect

Computational fluid dynamics (CFD) codes are increasingly being used in the liquefied natural gas (LNG) industry to predict natural gas dispersion distances. This paper addresses several issues regarding the use of CFD for LNG dispersion such as specification of the domain, grid, boundary and initial conditions. A description of the k-{var_epsilon} model is presented, along with modifications required for atmospheric flows. Validation issues pertaining to the experimental data from the Burro, Coyote, and Falcon series of LNG dispersion experiments are also discussed. A description of the atmosphere is provided as well as discussion on the inclusion of the Coriolis force to model very large LNG spills.

Luketa-Hanlin, Anay Josephine; Koopman, Ronald P. (Lawrence Livermore National Laboratory, Livermore, CA); Ermak, Donald (Lawrence Livermore National Laboratory, Livermore, CA)

2006-02-01T23:59:59.000Z

396

Int. J. Environment and Pollution, Vol. 8, Nos. 3-6, 1997 727 Gaseous pollutant dispersion around urban-canopy  

E-Print Network (OSTI)

. Meroney, 1983: Gas dispersion near a cubical model building. Part I. Mean concentration measurements. JInt. J. Environment and Pollution, Vol. 8, Nos. 3-6, 1997 727 Gaseous pollutant dispersion around numerical predictions of atmospheric dispersion in the urban environment on sub-meso scales. Wind

Fedorovich, Evgeni

397

Dispersive and classical shock waves in Bose-Einstein condensates and gas dynamics M. A. Hoefer,1,  

E-Print Network (OSTI)

Dispersive and classical shock waves in Bose-Einstein condensates and gas dynamics M. A. Hoefer,1 cf. Ref. 1 , it is impor- tant to relate this work to the "dispersive gas dynamics" which BEC in a compressible fluid, the weak limit u¯ repre- sents an idealized dispersive shock wave. Any compressible gas

Hoefer, Mark

398

GIS-Based Hazardous Gas Dispersion, Simulations and Analysis Debasis Karmakar, Samit Ray Chaudhuri and Eduardo Jose Maguino  

E-Print Network (OSTI)

GIS-Based Hazardous Gas Dispersion, Simulations and Analysis Debasis Karmakar, Samit Ray Chaudhuri of Plant Area Performed scenario-based simulation of hazardous gas dispersion from a continuous area source comparison to be made under other conditions such as Jet fire, explosion, dispersion of heavy dense gas

Shinozuka, Masanobu

399

A scattered data approximation tool to map single-walled carbon nanotube dispersion to the processing parameters in polymer nanocomposites  

Science Conference Proceedings (OSTI)

The relationship of nanocomposite dispersion to dispersion techniques and other processing parameters was studied. Examining all permutations of the various factors in the laboratory is a challenging task. In this paper, we propose to map a correlation ... Keywords: CNTs, RBF, carbon nanotubes, classification, dispersion, feature selection, functional mapping, greedy algorithms, nanotechnology, polymer nanocomposites, polymer processing, radial basis function, scattered data approximation, sequential function approximation

Jonathan W. Lee; Andrew J. Meade; Enrique V. Barrera

2010-08-01T23:59:59.000Z

400

Dispersion theory of nucleon Compton scattering and polarizabilities  

E-Print Network (OSTI)

A status report on the topic Compton scattering and polarizabilities is presented with emphasis on the scalar t-channel as entering into dispersion theory. Precise values for the polarizabilities are obtained leading to $\\alpha_p = 12.0\\pm 0.6$ $(12.0)$, $\\beta_p=1.9\\mp 0.6$ $(1.9)$, $\\alpha_n= 12.5\\pm 1.7$ $(13.4)$, $\\beta_n= 2.7 \\mp 1.8$ $(1.8)$ in units of $10^{-4}$ fm$^3$ and $\\gamma^{(p)}_\\pi = -36.4 \\pm 1.5$ $(-36.6)$, $\\gamma^{(n)}_\\pi = 58.6 \\pm 4.0$ $(58.3)$, $(\\gamma^{(p)}_0= -0.58\\pm 0.20)$, $(\\gamma^{(n)}_0 = +0.38\\pm 0.22)$ in units of $10^{-4}$ fm$^4$, for the proton (p) and neutron (n), respectively. The data given with an error are {\\it recommended} experimental values with updates compared to [1] where necessary, the data in parentheses are predicted values. These predicted values are not contained in [1], but are the result of a newly developed analysis which is the main topic of the present paper. The most important recent discovery is that the largest part of the electric polarizability and the total diamagnetic polarizability of the nucleon are properties of the $\\sigma$ meson as part of the constituent-quark structure, as expected from the mechanism of chiral symmetry breaking. This view is supported by an experiment on Compton scattering by the proton carried out in the second resonance region, where a large contribution from the $\\sigma$ meson enters into the scattering amplitudes. This experiment led to a determination of the mass of the $\\sigma$ meson of $m_\\sigma = 600 \\pm 70$ MeV. From the experimental $\\alpha_p$ and predicted differences $(\\alpha_n - \\alpha_p)$ neutron polarizabilities in the range $\\alpha_n= 12.0 - 13.4$ are predicted, where the uncertainties are related to the $f_0(980)$ and $a_0(980)$ scalar mesons.

Martin Schumacher; Michael D. Scadron

2013-01-08T23:59:59.000Z

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401

An external dose reconstruction involving a radiological dispersal device  

E-Print Network (OSTI)

Recent events have underscored the need for the United States government to provide streamlined emergency response procedures and subsequent dose estimations for personnel responding to incidents involving radioactive material. Indeed, the National Council on Radiation Protection and Measurements Report No. 138 (NCRP 2001) indicates that exposures received by first responders will be important for a number of reasons, including planning for the appropriate use of key personnel in an extended emergency situation. In response, the Department of Homeland Security has published Protective Action Guides (DHS 2006) to help minimize these exposures and associated risks. This research attempts to provide some additional radiological exposure knowledge so that an Incident Commander, with limited or no information, can make more informed decisions about evacuation, sheltering-in-place, relocation of the public, turn-back levels, defining radiation hazard boundaries, and in-field radiological dose assessments of the radiation workers, responders, and members of the public. A method to provide such insight begins with providing a model that describes the physics of radiation interactions, radiation source and geometry, collection of field measurements, and interpretation of the collected data. A Monte Carlo simulation of the model is performed so that calculated results can be compared to measured values. The results of this investigation indicate that measured organ absorbed doses inside a tissue equivalent phantom compared favorably to the derived organ absorbed doses measured by the Panasonic thermoluminescence dosimeters and with Monte Carlo �N� Particle modeled results. Additionally, a Victoreen 450P pressurized ion chamber measured the integrated dose and these results compared well with the Panasonic right lateral TLD. This comparison indicates that the Victoreen 450P ionization chamber could potentially serve as an estimator of real-time effective dose and organ absorbed dose, if energy and angular dependence corrections could be taken into account. Finally, the data obtained in this investigation indicate that the MCNP model provided a reasonable method to determine organ absorbed dose and effective dose of a simulated Radiological Dispersal Device in an Inferior-Superior geometry with Na99mTcO4 as the source of radioactive material.

Hearnsberger, David Wayne

2006-12-01T23:59:59.000Z

402

Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) |  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) Exploration Activity Details Location Lightning Dock Area Exploration Technique Thermal Ion Dispersion Activity Date Usefulness useful DOE-funding Unknown Notes Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples

403

Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling  

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

Review of the ENSR Report Titled "Update 1 to: A Dispersion Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Docket No. EO-05-01. Sullivan Environmental Consulting, Inc. has prepared a review of the "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" written by ENSR Corporation on behalf of the Mirant Potomac River Power Plant. This report models only Unit #1 operating under two daytime only scenarios to reduce exposures and meet the National Ambient Air Quality Standards for PM10, SO2, and NOx that were not met using normal operating procedures.

404

Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

Update 1 to: A Dispersion Modeling Analysis of Downwash from Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions in a Cycling Mode Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions in a Cycling Mode Docket No. EO-05-01. This report describes dispersion modeling performed for Unit 1 at Mirant's Potomac River Generating Station. The modeling was performed according to the Protocol approved by the Virginia Department of Environmental Quality. The purpose of the modeling was to demonstrate that Unit 1 operating alone under specific loads and during certain periods in a calendar day will not cause or contribute to exceedances of the National Ambient Air Quality Standards (NAAQS).

405

Update 6 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

6 to: A Dispersion Modeling Analysis of Downwash from 6 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant Modeling Baseload Units 3,4,5 Update 6 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant Modeling Baseload Units 3,4,5 Docket No. EO-05-01: This report describes dispersion modeling performed for simultaneous operation of three baseload units at Mirant's Potomac River Generating Station (PRGS). The units (3,4,5) would operate at maximum load (107 MW) for up to 12 hours and minimum load (35 MW) 12 hours or more in a calendar day. This mode of operation is also referred to as Option B in Mirant Potomac River LLC's December 30, 2005 letter to the U.S. Department of Energy regarding District of Columbia Public Service Commission, Docket No. EO-05-01. The modeling was performed according to

406

Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling  

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

Review of the ENSR Report Titled "Update 1 to: A Dispersion Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Docket No. EO-05-01. Sullivan Environmental Consulting, Inc. has prepared a review of the "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" written by ENSR Corporation on behalf of the Mirant Potomac River Power Plant. This report models only Unit #1 operating under two daytime only scenarios to reduce exposures and meet the National Ambient Air Quality Standards for PM10, SO2, and NOx that were not met using normal operating procedures.

407

Translation and dispersion of sediment pulses in flume experiments simulating gravel  

E-Print Network (OSTI)

to propagate primarily by dispersion; however, pulse translation may occur for gravel additions to armored report results of a laboratory investigation in which we created an immobile, armored bed and documented

Venditti, Jeremy G.

408

Factor graphs and MCMC approaches to iterative equalization of nonlinear dispersive channels  

E-Print Network (OSTI)

In this work, equalization for nonlinear dispersive channels is considered. Nonlinear communication channels can lead to significant degradations when nonlinearities are not taken into account at either the receiver or the ...

Kashif, Faisal M. (Faisal Mahmood)

2006-01-01T23:59:59.000Z

409

A Simple Model for Pollution Dispersion in a Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A simplified model for dispersion in a convective boundary layer is presented and is used to diagnose crosswind-integrated concentrations, ground-level concentrations, and vertical plume spread over flat terrain for various release heights. The ...

Roland Stull; Bruce Ainslie

2006-12-01T23:59:59.000Z

410

Parameterization of Convective Transport in a Lagrangian Particle Dispersion Model and Its Evaluation  

Science Conference Proceedings (OSTI)

This paper presents the revision and evaluation of the interface between the convective parameterization by Emanuel and Živkovi?-Rothman and the Lagrangian particle dispersion model “FLEXPART” based on meteorological data from the European Centre ...

Caroline Forster; Andreas Stohl; Petra Seibert

2007-04-01T23:59:59.000Z

411

Evaluation of Lagrangian Particle Dispersion Models with Measurements from Controlled Tracer Releases  

Science Conference Proceedings (OSTI)

Three widely used Lagrangian Particle Dispersion Models (LPDMs), HYSPLIT, STILT and FLEXPART are evaluated with measurements from the controlled tracer release experiments CAPTEX and ANATEX. The LPDMs are run forward in time driven by identical ...

Jennifer Hegarty; Roland R. Draxler; Ariel F. Stein; Jerome Brioude; Marikate Mountain; Janusz Eluszkiewicz; Thomas Nehrkorn; Fong Ngan; Arlyn Andrews

412

Comparisons of Transport and Dispersion Model Predictions of the URBAN 2000 Field Experiment  

Science Conference Proceedings (OSTI)

The tracer releases of the “URBAN 2000” urban tracer and meteorological field experiment conducted in Salt Lake City, Utah, in October 2000 provided a wealth of data for comparison with the predictions of transport and dispersion models. ...

Steve Warner; Nathan Platt; James F. Heagy

2004-06-01T23:59:59.000Z

413

Linking a Lagrangian Particle Dispersion Model with Three-Dimensional Eulerian Wind Field Models  

Science Conference Proceedings (OSTI)

A slightly simplified form of Thomson’s Lagrangian stochastic model (LSM) is presented for dispersion applications in three-dimensional (3D) flow fields. It is found that the Lagrangian velocity of a particle in 3D inhomogeneous Gaussian ...

Jeffrey C. Weil

2008-09-01T23:59:59.000Z

414

12.141 Electron Microprobe Analysis by Wavelength Dispersive X-ray Spectrometry, January (IAP) 2006  

E-Print Network (OSTI)

Introduction to the theory of x-ray microanalysis through the electron microprobe including ZAF matrix corrections. Techniques to be discussed are wavelength and energy dispersive spectrometry, scanning backscattered ...

Chatterjee, Nilanjan

415

A Numerical Study of Flow and Pollutant Dispersion Characteristics in Urban Street Canyons  

Science Conference Proceedings (OSTI)

The flow and pollutant dispersion in urban street canyons are investigated using a two-dimensional numerical model with the k–? turbulent closure scheme. It is shown that the flow field is characterized mainly by the number and intensity of ...

Jong-Jin Baik; Jae-Jin Kim

1999-11-01T23:59:59.000Z

416

Lagrangian Drifter Dispersion in the Surf Zone: Directionally Spread, Normally Incident Waves  

Science Conference Proceedings (OSTI)

Lagrangian drifter statistics in a surf zone wave and circulation model are examined and compared to single- and two-particle dispersion statistics observed on an alongshore uniform natural beach with small, normally incident, directionally ...

Matthew Spydell; Falk Feddersen

2009-04-01T23:59:59.000Z

417

Lidar Sensing of Plume Dispersion: Analysis Methods and Product Quality for Light-Scattering Tracer Particles  

Science Conference Proceedings (OSTI)

Analysis procedures are described for retrieving accurate plume information from lidar data on light-scattering particles during atmospheric dispersion experiments. Interactive computer graphics aided in the solution of the lidar equation for ...

W. L. Eberhard; G. T. McNice; S. W. Troxel

1987-12-01T23:59:59.000Z

418

The Probability Distribution of Wind Power From a Dispersed Array of Wind Turbine Generators  

Science Conference Proceedings (OSTI)

A method is presented for estimating the probability distribution of wind power from a dispersed array of wind turbine sites where the correlation between wind speeds at distinct sites is less than unity. The distribution is obtained from a model ...

John Carlin; John Haslett

1982-03-01T23:59:59.000Z

419

Sonar Observations of Langmuir Circulation and Estimation of Dispersion of Floating Particles  

Science Conference Proceedings (OSTI)

Observations are described of Langmuir circulation obtained using upward-pointing bottom-mounted sonars, and a methodology to use the data to estimate the dispersion of floating particles is suggested. Observations of linear bands of acoustic ...

S. A. Thorpe; M. S. Cure; A. Graham; A. J. Hall

1994-10-01T23:59:59.000Z

420

Efficient localization in a dispersive waveguide : applications in terrestrial continental shelves and on Europa  

E-Print Network (OSTI)

Methods are developed for passive source localization and environmental parameter estimation in seismo-acoustic waveguides by exploiting the dispersive behavior of guided wave propagation. The methods developed are applied ...

Lee, Sunwoong

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Application of Lateral Boundary Condition Perturbations to Help Restore Dispersion in Limited-Area Ensemble Forecasts  

Science Conference Proceedings (OSTI)

In a companion paper, the authors showed that lateral boundary condition (LBC) constraints on small-scale error variance growth are sufficient to limit dispersion in limited-area-model (LAM) ensemble simulations. The error growth constraints ...

Paul Nutter; Ming Xue; David Stensrud

2004-10-01T23:59:59.000Z

422

Lagrangian Particle Dispersion Modeling of the Fumigation Process Using Large-Eddy Simulation  

Science Conference Proceedings (OSTI)

A Lagrangian particle dispersion model (LPDM) is used to study fumigation of pollutants in and above the entrainment zone into a growing convective boundary layer. Probability density functions of particle location with height and time are ...

Si-Wan Kim; Chin-Hoh Moeng; Jeffrey C. Weil; Mary C. Barth

2005-06-01T23:59:59.000Z

423

Magnetically driven three-dimensional manipulation and inductive heating of magnetic-dispersion containing metal alloys  

E-Print Network (OSTI)

Fundamental to the development of three-dimensional microelectronic fabrication is a material that enables vertical geometries. Here we show low-melting-point metal alloys containing iron dispersions that can be remotely ...

Calabro, Joshua D.

424

Gas production potential of disperse low-saturation hydrate accumulations in oceanic sediments  

E-Print Network (OSTI)

rate and the mass of produced water from disperse, low- S Hgas V P , mass flow rate of produced water at the well Qand cumulative mass of produced water M W . Note that there

Moridis, George J.; Sloan, E. Dendy

2006-01-01T23:59:59.000Z

425

N2: Fabrication of Uranium Dispersion Targets for Mo-99 Production  

Science Conference Proceedings (OSTI)

Uranium metal powder was fabricated by a centrifugal atomization technique. Uranium content of the dispersion targets was controlled to be 3, 6 and 9 g-U/ cm2 ...

426

CTDMPLUS: A Dispersion Model for Sources near Complex Topography. Part II: Performance Characteristics  

Science Conference Proceedings (OSTI)

The Complex Terrain Dispersion Model (CTDMPLUS), described in Part I of this paper, was evaluated using the SO2 field-study data from the Lovett generating station in southeastern New York state. For perspective, CTDMPLUS estimates were also ...

James O. Paumier; Donna J. Burns; Steven G. Perry

1992-07-01T23:59:59.000Z

427

A comparative study of dispersion techniques for nanocomposite made with nanoclays and an unsaturated polyester resin  

Science Conference Proceedings (OSTI)

Over the last few years, polymer/clay nanocomposites have been an area of intensive research due to their capacity to improve the properties of the polymer resin. These nanocharged polymers exhibit a complex rheological behavior due to their dispersed ...

Farida Bensadoun; Nadir Kchit; Catherine Billotte; François Trochu; Edu Ruiz

2011-01-01T23:59:59.000Z

428

The Roles of Langmuir Circulations in the Dispersion of Surface Tracers  

Science Conference Proceedings (OSTI)

A hierarchy of theoretical and numerical models for the dispersion of discrete floating tracers on lakes and oceans is presented. Central to these models is the role of Langmuir circulations, which concentrate tracers into narrow windrows this ...

Alan J. Faller; Stephen J. Auer

1988-08-01T23:59:59.000Z

429

Gas atomized precursor alloy powder for oxide dispersion strengthened ferritic stainless steel.  

E-Print Network (OSTI)

??Gas atomization reaction synthesis (GARS) was employed as a simplified method for producing precursor powders for oxide dispersion strengthened (ODS) ferritic stainless steels (e.g., Fe-Cr-Y-(Ti,Hf)-O),… (more)

Rieken, Joel Rodney

2011-01-01T23:59:59.000Z

430

Atmospheric Dispersion from Elevated Sources in an Urban Area: Comparison between Tracer Experiments and Model Calculations  

Science Conference Proceedings (OSTI)

Atmospheric dispersion experiments were carried out in the Copenhagen area under neutral and unstable conditions. The tracer sulphurhexafluoride was released without buoyancy from a tower at a height of 115 m and then collected at ground-level ...

Sven-Erik Gryning; Erik Lyck

1984-04-01T23:59:59.000Z

431

Consequences of Urban Stability Conditions for Computational Fluid Dynamics Simulations of Urban Dispersion  

Science Conference Proceedings (OSTI)

The validity of omitting stability considerations when simulating transport and dispersion in the urban environment is explored using observations from the Joint Urban 2003 field experiment and computational fluid dynamics simulations of that ...

Julie K. Lundquist; Stevens T. Chan

2007-07-01T23:59:59.000Z

432

Dispersion of Airborne-Released Silver Iodide in Winter Orographic Clouds  

Science Conference Proceedings (OSTI)

Two flight plans were used for a seeding aircraft and a measurement aircraft in the study of silver iodide plume dispersion. An instantaneous line source and a continuous point source plume generation were simulated approximately by the seeding ...

Geoffrey E. Hill

1980-08-01T23:59:59.000Z

433

Lagrangian Particle Simulation of Tracer Dispersion in the Lee of a Schematic Two-Dimensional Hill  

Science Conference Proceedings (OSTI)

Spray, a 3D Lagrangian particle model for the simulation of complex flow dispersion, is presented. Its performance is tested against the Environmental Protection Agency wind tunnel concentration distribution of passive tracer released from ...

G. Tinarelli; D. Anfossi; G. Brusasca; E. Ferrero; U. Giostra; M. G. Morselli; J. Moussafir; F. Trombetti; F. Tampieri

1994-06-01T23:59:59.000Z

434

A Gaussian Plume Model of Atmospheric Dispersion Based on Second-Order Closure  

Science Conference Proceedings (OSTI)

A practical model of atmospheric dispersion of a passive tracer based on systematic reduction of the second-order closure transport equations using Gaussian shape assumptions is presented. The model is comparable with conventional Gaussian plume ...

R. I. Sykes; W. S. Lewellen; S. F. Parker

1986-03-01T23:59:59.000Z

435

Comparisons of Transport and Dispersion Model Predictions of the Joint Urban 2003 Field Experiment  

Science Conference Proceedings (OSTI)

For a hazardous material release in a city or densely populated area, effective mitigation requires an understanding of the transport and dispersion of these hazards in the complex urban environment. Improved characterization and understanding of ...

Steve Warner; Nathan Platt; Jeffry T. Urban; James F. Heagy

2008-07-01T23:59:59.000Z

436

An Approach for Estimating Dispersion in Variable Intensity: An Example of Estimating a Real Case  

Science Conference Proceedings (OSTI)

Gaussian models are the important tools in the development of successful emergency response strategies of air pollutants or hazardous materials. As numerical dispersion models via predicting the influencing area affected by the passage of hazardous gas

Maolei Zhang; Rui Yang; Hongyong Yuan

2010-01-01T23:59:59.000Z

437

Evaluation of a Fast-Running Urban Dispersion Modeling System Using Joint Urban 2003 Field Data  

Science Conference Proceedings (OSTI)

An urban dispersion modeling system was evaluated using the Joint Urban 2003 field data. The system consists of a fast-running urban airflow model (RUSTIC, for Realistic Urban Spread and Transport of Intrusive Contaminants) that is coupled with a ...

Eric A. Hendricks; Steve R. Diehl; Donald A. Burrows; Robert Keith

2007-12-01T23:59:59.000Z

438

Plume Dispersion Anomalies in a Nocturnal Urban Boundary Layer in Complex Terrain  

Science Conference Proceedings (OSTI)

The URBAN 2000 experiments were conducted in the complex urban and topographical terrain in Salt Lake City, Utah, in stable nighttime conditions. Unexpected plume dispersion often arose because of the interaction of complex terrain and mountain–...

Dennis Finn; Kirk L. Clawson; Roger G. Carter; Jason D. Rich; K. Jerry Allwine

2008-11-01T23:59:59.000Z

439

A Numerical Study of Thermal Effects on Flow and Pollutant Dispersion in Urban Street Canyons  

Science Conference Proceedings (OSTI)

This study investigates thermal effects on the flow and pollutant dispersion in urban street canyons. A two-dimensional numerical model with a k–? turbulent closure scheme is developed, and the heat transfer between the air and the building wall ...

Jae-Jin Kim; Jong-Jin Baik

1999-09-01T23:59:59.000Z

440

Combined Use of Three Techniques for Studying Transport and Dispersion in Cumuli  

Science Conference Proceedings (OSTI)

The results from three methods for studying transport and dispersion in cumuli are compared. These three methods include two tracer techniques and a numerical simulation. The tracers, SF6 and radar chaff, were simultaneously released below the ...

Jefrey Stith; John Scala; Roger Reinking; Brooks Martner

1996-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Vertical Tracer Concentration Profiles Measured during the Joint Urban 2003 Dispersion Study  

Science Conference Proceedings (OSTI)

An atmospheric tracer dispersion study known as Joint Urban 2003 was conducted in Oklahoma City, Oklahoma, during July of 2003. As part of this field program, vertical concentration profiles were measured at approximately 1 km from the downtown ...

Julia E. Flaherty; Brian Lamb; K. Jerry Allwine; Eugene Allwine

2007-12-01T23:59:59.000Z

442

Additional Field Verification of Convective Scaling for the Lateral Dispersion Parameter  

Science Conference Proceedings (OSTI)

The results of a series of diffusion trials over the heterogeneous surface of the Canadian Precambrian Shield provide additional support for the convective scaling of the lateral dispersion parameter, ?y. The data indicate that under convective ...

S. K. Sakiyama; P. A. Davis

1988-07-01T23:59:59.000Z

443

A Dynamically Adapting Weather and Dispersion Model: The Operational Multiscale Environment Model with Grid Adaptivity (OMEGA)  

Science Conference Proceedings (OSTI)

The Operational Multiscale Environment Model with Grid Adaptivity (OMEGA) and its embedded Atmospheric Dispersion Model is a new atmospheric simulation system for real-time hazard prediction, conceived out of a need to advance the state of the ...

David P. Bacon; Nash’at N. Ahmad; Zafer Boybeyi; Thomas J. Dunn; Mary S. Hall; Pius C. S. Lee; R. Ananthakrishna Sarma; Mark D. Turner; Kenneth T. Waight III; Steve H. Young; John W. Zack

2000-07-01T23:59:59.000Z

444

Wintertime Dispersion in a Mountainous Basin at Roanoke, Virginia: Tracer Study  

Science Conference Proceedings (OSTI)

During January 1989, five nighttime SF6 tracer experiments were conducted in Roanoke, Virginia. The experiments were designed to help identify and understand the dispersion characteristics of a basin atmosphere during winter stagnation ...

K. Jerry Allwine; Brian K. Lamb; Robert Eskridge

1992-11-01T23:59:59.000Z

445

CTDMPLUS: A Dispersion Model for Sources near Complex Topography. Part I: Technical Formulations  

Science Conference Proceedings (OSTI)

The Complex Terrain Dispersion Model (CTDMPLUS), a point-source, steady-state model for complex-terrain applications, is described. The model simulates the flow and plume distortion near user-selected, three-dimensional terrain features, yet ...

Steven G. Perry

1992-07-01T23:59:59.000Z

446

Critical heat flux enhancement via surface modification using colloidal dispersions of nanoparticles (Nanofluids)  

E-Print Network (OSTI)

Nanofluids are engineered colloidal dispersions of nanoparticles (1-100nm) in common fluids (water, refrigerants, or ethanol...). Materials used for nanoparticles include chemically stable metals (e.g., gold, silver, ...

Truong, Bao H. (Bao Hoai)

2008-01-01T23:59:59.000Z

447

Chirality-dependent, van der Waals-London dispersion interactions of carbon nanotube systems  

E-Print Network (OSTI)

The Lifshitz formulation is a quantum electrodynamic, first principals formulation used to determine van der Waals - London dispersion interactions in the continuum limit. It has many advantages over crude, pairwise potential ...

Rajter, Richard F

2009-01-01T23:59:59.000Z

448

Scale-dependent dispersion within the stratified interior on the shelf of northern Monterey Bay  

Science Conference Proceedings (OSTI)

Autonomous underwater vehicle measurements are used to quantify lateral dispersion of a continuously released Rhodamine WT dye plume within the stratified interior of shelf waters in northern Monterey Bay, CA. The along-shelf evolution of the ...

Ryan J. Moniz; Derek A. Fong; C. Brock Woodson; Susan K. Willis; Mark T. Stacey; Stephen G. Monismith

449

Computational Fluid Dynamic Simulations of Plume Dispersion in Urban Oklahoma City  

Science Conference Proceedings (OSTI)

A 3D computational fluid dynamics study using Reynolds-averaged Navier–Stokes modeling was conducted and validated with field data from the Joint Urban 2003 dispersion study in Oklahoma City, Oklahoma. The modeled flow field indicated that the ...

Julia E. Flaherty; David Stock; Brian Lamb

2007-12-01T23:59:59.000Z

450

A PDF Dispersion Model for Buoyant Plumes in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A probability density function (PDF) dispersion model is presented for buoyant plumes in the convective boundary layer (CBL), where the mean concentration field C is obtained from the PDFs py and pz of tracer particle position in the lateral y ...

J. C. Weil; L. A. Corio; R. P. Brower

1997-08-01T23:59:59.000Z

451

Plume Dispersion in the Convective Boundary Layer. Part I: CONDORS Field Experiment and Example Measurements  

Science Conference Proceedings (OSTI)

Project CONDORS (CONvective Diffusion Observed by Remote Sensors) measured the dispersion of a nonbuoyant plume in the highly convective boundary layer. Laboratory and numerical models have predicted vertical profiles of a passive tracer that are ...

W. L. Eberhard; W. R. Moninger; G. A. Briggs

1988-05-01T23:59:59.000Z

452

An Indirect Estimation of Convective Boundary Layer Structure for Use in Pollution Dispersion Models  

Science Conference Proceedings (OSTI)

Dispersion models of the convectively driven atmospheric boundary layer (ABL) often require as input meteorological parameters that are not routinely measured. These parameters usually include the surface fluxes of heat and momentum ?Cpw???and ?u?w?, the ...

James M. Wilczak; Mary Sue Phillips

1986-11-01T23:59:59.000Z

453

Generalized dispersion relation for electron Bernstein waves in a non-Maxwellian magnetized anisotropic plasma  

SciTech Connect

A generalized dielectric constant for the electron Bernstein waves using non-Maxwellian distribution functions is derived in a collisionless, uniform magnetized plasma. Using the Neumann series expansion for the products of Bessel functions, we can derive the dispersion relations for both kappa and the generalized (r,q) distributions in a straightforward manner. The dispersion relations now become dependent upon the spectral indices {kappa} and (r,q) for the kappa and the generalized (r,q) distribution, respectively. Our results show how the non-Maxwellian dispersion curves deviate from the Maxwellian depending upon the values of the spectral indices chosen. It may be noted that the (r,q) dispersion relation is reduced to the kappa distribution for r=0 and q={kappa}+1, which, in turn, is further reducible to the Maxwellian distribution for {kappa}{yields}{infinity}.

Deeba, F. [National Tokamak Fusion Program, PAEC, P.O. Box 3329, Islamabad 44000 (Pakistan); Department of Physics, G. C. University, Lahore 54000 (Pakistan); Ahmad, Zahoor [National Tokamak Fusion Program, PAEC, P.O. Box 3329, Islamabad 44000 (Pakistan); Murtaza, G. [Salam Chair in Physics, G. C. University, Lahore 54000 (Pakistan)

2010-10-15T23:59:59.000Z

454

Modeling the Pathways and Mean Dynamics of River Plume Dispersal in the New York Bight  

Science Conference Proceedings (OSTI)

This study investigates the dispersal of the Hudson River outflow across the New York Bight and the adjacent inner- through midshelf region. Regional Ocean Modeling System (ROMS) simulations were used to examine the mean momentum dynamics; the ...

Weifeng G. Zhang; John L. Wilkin; Robert J. Chant

2009-05-01T23:59:59.000Z

455

A Dispersion Model Evaluation Study for Real-Time Application in Complex Terrain  

Science Conference Proceedings (OSTI)

A few tracer experiments were carried out in autumn 1984 and summer 1985 at the Lago Brasimone site, on the Appennini Mountains approximately 50 km south of Bologna with the purpose assessing the atmospheric dispersion of pollutants under ...

F. Desiato

1991-08-01T23:59:59.000Z

456

The dispersion interaction between quantum mechanics and effective fragment potential molecules  

SciTech Connect

A method for calculating the dispersion energy between molecules modeled with the general effective fragment potential (EFP2) method and those modeled using a full quantum mechanics (QM) method, e.g., Hartree-Fock (HF) or second-order perturbation theory, is presented. C6 dispersion coefficients are calculated for pairs of orbitals using dynamic polarizabilities from the EFP2 portion, and dipole integrals and orbital energies from the QM portion of the system. Dividing by the sixth power of the distance between localized molecular orbital centroids yields the first term in the commonly employed London series expansion. A C8 term is estimated from the C6 term to achieve closer agreement with symmetry adapted perturbation theory values. Two damping functions for the dispersion energy are evaluated. By using terms that are already computed during an ordinary HF or EFP2 calculation, the new method enables accurate and extremely rapid evaluation of the dispersion interaction between EFP2 and QM molecules.

Smith, Quentin A.; Ruedenberg, Klaus; Gordon, Mark S.; Slipchenko, Lyudmila

2012-06-26T23:59:59.000Z

457

Update 5 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

5 to: A Dispersion Modeling Analysis of Downwash from 5 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant: Modeling Cycling Units 1, 2 plus One Baseload Unit Update 5 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant: Modeling Cycling Units 1, 2 plus One Baseload Unit Docket No. EO-05-01: This report describes dispersion modeling performed for simultaneous operation of one baseload unit and two cycling units at Mirant's Potomac River Generating Station (PRGS). This mode of operation is also referred to as Option A in Mirant Potomac River LLC's December 30, 2005 letter to the U.S. Department of Energy regarding District of Columbia Public Service Commission, Docket No. EO-05- 01. The modeling was performed according to the Protocol approved by the Virginia Department of

458

Qualification of New, Commercial Oxide Dispersion-Strengthened Alloys for Use in Advanced Fossil Processes  

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

Qualification of New, Commercial Oxide Qualification of New, Commercial Oxide Dispersion-Strengthened Alloys for Use in Advanced Fossil Processes Background Advanced higher-efficiency power generation plants would typically operate at higher temperatures and pressures than existing fleet, and would require materials that can withstand operations at these higher temperatures and pressures. Special ferritic alloys of iron called oxide dispersion-strengthened (ODS) steel have the

459

Turbulence Structure and Implications for Dispersion: Insights from Large-Eddy Simulations  

SciTech Connect

We have presented two flows where detailed knowledge of the fluid mechanics would appear to be crucial for accurate dispersion modeling. We expect that Large-eddy simulations (LES) will complement traditional dispersion modeling by providing both the ability to discern between cases where traditional models work well and cases where more complicated characterizations are necessary, and a method to investigate potentially unique flow features and turbulence structure for specific flow problems.

Calhoun, R; Cederwall, R; Street, R

1999-10-04T23:59:59.000Z

460

Effects of Acclimation on Poststocking Dispersal and Physiological Condition of Age-1 Pallid Sturgeon  

Science Conference Proceedings (OSTI)

A propagation program for pallid sturgeon Scaphirhynchus albus in the upper Missouri River was implemented by the U. S. Fish and Wildlife Service in 1997. Preliminary research indicated that many hatchery-reared pallid sturgeon were experiencing significant downstream poststocking dispersal, negatively affecting their recruitment. Therefore, the objective of this study was to evaluate the effects of acclimation to flow and site-specific physicochemical water conditions on poststocking dispersal and physiological condition of age-1 pallid sturgeon. Fish from three acclimation treatments were radio-tagged, released at two locations (Missouri River and Marias River), and monitored using passive telemetry stations. Marias treatment was acclimated to flow and site-specific physicochemical conditions, Bozeman treatment was acclimated to flow only, and traditional treatment had no acclimation (reared under traditional protocol). During both years fish released in the Missouri River dispersed less than fish released in the Marias River. In 2005, Marias treatment dispersed less and nearly twice as many fish remained in the Missouri River reach than traditional treatment. In 2006, pallid sturgeon dispersed similarly among treatments and fish remaining in the Missouri River reach were similar among all treatments. Differences in poststocking dispersal between years may be related to fin curl. Fin curl was present in all fish in 2005 and 27% of the fish in 2006. Pallid sturgeon from all treatments in both years had a greater affinity for the lower reaches of the Missouri River than the upper reaches. Thus, habitat at release site influenced poststocking dispersal more than acclimation treatment. No difference was observed in relative growth rate among treatments in 2006. However, acclimation to flow (i.e., exercise conditioning) may reduce liver fat content. Acclimation conditions used in this study may not benefit pallid sturgeon unless physiological maladies are present. Further, natural resource agencies need to consider stocking location carefully to reduce poststocking dispersal.

Oldenburg, Eric W.; Guy, Christopher S.; Cureton, Eli S.; Webb, Molly H.; Gardner, William M.

2011-03-28T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" 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

Wave dispersion in a counterstreaming, relativistic thermal, magnetized, electron-positron plasma  

SciTech Connect

The dispersion equation is analyzed for waves in a strongly magnetized, electron-positron plasma in which counterstreaming electrons and positrons have a relativistic thermal distribution in their respective rest frames, for propagation parallel to the magnetic field. We derive the response tensor for the medium, demonstrate the dispersion curves for different temperatures, and discuss the differences from the cold-plasma case. Application to the case of pulsar magnetospheres is discussed.

Verdon, M. W.; Melrose, D. B. [School of Physics, University of Sydney, Sydney, New South Wales 2006 (Australia)

2011-05-15T23:59:59.000Z

462

Impact of dispersed solar and wind systems on electric distribution planning and operation  

DOE Green Energy (OSTI)

Small-scale dispersed solar photovoltaic and wind generation (DSW) will affect the generation, transmission, and distribution systems of an electric utility. This study examines the technical and economic impacts of dispersing DSW devices within the distribution system. Dispersed intermittent generation is included. Effects of DSW devices on capital investments, reliability, operating and maintenance costs, protection requirements, and communication and control requirements are examined. A DSW operation model is developed to help determine the dependable capacity of fluctuating solar photovoltaic and wind generation as part of the distribution planning process. Specific case studies using distribution system data and renewable resource data for Southern California Edison Company and Consumers Power Company are analyzed to gain insights into the effects of interconnecting DSW devices. The DSW devices were found to offer some distribution investment savings, depending on their availability during peak loads. For a summer-peaking utility, for example, dispersing photovoltaic systems is more likely to defer distribution capital investments than dispersing wind systems. Dispersing storage devices to increase DSW's dependable capacity for distribution systems needs is not economically attractive. Substation placement of DSW and storage devices is found to be more cost effective than feeder or customer placement. Examination of the effects of DSW on distribution system operation showed that small customer-owned DSW devices are not likely to disrupt present time-current distribution protection coordination. Present maintenance work procedures, are adequate to ensure workmen's safety. Regulating voltages within appropriate limits will become more complex with intermittent generation along the distribution feeders.

Boardman, R.W.; Patton, R.; Curtice, D.H.

1981-02-01T23:59:59.000Z

463

Use and Application of the ARCON96 Dispersion Model at the Y-12 Complex  

Science Conference Proceedings (OSTI)

The Atmospheric Relative Concentrations in Building Wakes computer code (ARCON96) was developed for the U.S. Nuclear Regulatory Commission (NRC) to calculate normalized concentrations in plumes from nuclear power plants at control room air intakes in the vicinity of hypothetical accidental releases. ARCON96 implements a straight-line Gaussian dispersion model with dispersion coefficients that are modified to account for low-wind-speed meander and building wake effects. These two modifications to the dispersion coefficients were benchmarked and justified in the ARCON96 code documentation. The code calculates {chi}/Q values (normalized concentrations) consistent with the methodology defined in NRC Regulatory Guide (RG) 1.145, position 3. Based on recent U. S. Department of Energy (DOE) acceptance of NRC RG 1.145, position 3 methodology for performing accident dispersion analyses, BWXT Y-12 L.L.C. evaluated the potential use and application for performing dispersion analyses at the Y-12 Complex. Using site specific meteorology inputs, a generic analysis (assuming ground-level releases) was performed to develop site-wide normalized concentrations for various distances to be used in consequence screening analyses. Additionally, the results were compared to other dispersion analysis models for confirmation of the results.

Walker, D.A.; Lee, D.W.; Miller, R.L.

2001-06-04T23:59:59.000Z

464

PRIMORDIAL r-PROCESS DISPERSION IN METAL-POOR GLOBULAR CLUSTERS  

SciTech Connect

Heavy elements, those produced by neutron-capture reactions, have traditionally shown no star-to-star dispersion in all but a handful of metal-poor globular clusters (GCs). Recent detections of low [Pb/Eu] ratios or upper limits in several metal-poor GCs indicate that the heavy elements in these GCs were produced exclusively by an r-process. Re-examining GC heavy element abundances from the literature, we find unmistakable correlations between the [La/Fe] and [Eu/Fe] ratios in four metal-poor GCs (M5, M15, M92, and NGC 3201), only two of which were known previously. This indicates that the total r-process abundances vary from star to star (by factors of 2-6) relative to Fe within each GC. We also identify potential dispersion in two other GCs (M3 and M13). Several GCs (M12, M80, and NGC 6752) show no evidence of r-process dispersion. The r-process dispersion is not correlated with the well-known light element dispersion, indicating that it was present in the gas throughout the duration of star formation. The observations available at present suggest that star-to-star r-process dispersion within metal-poor GCs may be a common but not ubiquitous phenomenon that is neither predicted by nor accounted for in current models of GC formation and evolution.

Roederer, Ian U., E-mail: iur@obs.carnegiescience.edu [Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)

2011-05-01T23:59:59.000Z

465

Fundamental approach to the simulatoin of flow and dispersion in fractured media  

DOE Green Energy (OSTI)

Global flow and dispersion in an aquifer occur in the interconnected fractures and may be related to specific fracture elements. A fluid dynamics code named SALE has been used to solve the Navier-Stokes equations for laminar flow in these elemental geometries. A marker particle calculation has been added to characterize longitudinal dispersion due to the velocity profile across the fracture and lateral dispersion due to flow disturbances at junctions. Local flow and dispersion in the matrix occur in the finer fracture structure and are evaluated using porous media approaches. These results or models are integrated in a 2D isothermal reservoir simulator named FRACSL. Discrete fractures are superimposed on the edges or diagonals of rectangular grid elements. Water may flow from node to node through the matrix or through the fracture. The heads are found by iterating for the distribution which conserves the appropriate local mass. Marker particles are used to monitor the tracer dispersion due to motion in the fractures, in the matrix and between the two. Results are given showing flow and dispersion in an orthogonal junction and in a sample fractured reservoir.

Miller, J.D.

1983-01-01T23:59:59.000Z

466

An Algorithm for Detecting Quantum-Gravity Photon Dispersion in Gamma-Ray Bursts: DISCAN  

E-Print Network (OSTI)

DisCan is a new algorithm implementing photon dispersion cancellation in order to measure energy-dependent delays in variable sources. This method finds the amount of reversed dispersion that optimally cancels any actual dispersion present. It applies to any time- and energy-tagged photon data, and can avoid binning in both time and energy. The primary motivation here is the search for quantum gravity based dispersion in future gamma ray burst data from the Gamma Ray Large Area Space Telescope (GLAST). Extrapolation of what is know about bursts at lower energies yields a reasonable prospect that photon dispersion effects consistent with some quantum gravity formalisms may be detected in sufficiently bright bursts. Short bursts have no or very small inherent lags, and are therefore better prospects than long ones, but even they suffer systematic error due to pulse asymmetry that may yield an irreducible uncertainty. We note that data at energies higher than about 0.1 TeV may not be useful for detecting dispersion in GRBs. Of several variants of the proposed algorithm, one based on Shannon information is consistently somewhat superior to all of the others we investigated.

Jeffrey D. Scargle; Jay P. Norris; Jerry T. Bonnell

2006-10-19T23:59:59.000Z

467

Method and apparatus for reducing sample dispersion in turns and junctions of microchannel systems  

DOE Patents (OSTI)

The performance of microchannel devices is improved by providing turns, wyes, tees, and other junctions that produce little dispersions of a sample as it traverses the turn or junction. The reduced dispersion results from contraction and expansion regions that reduce the cross-sectional area over some portion of the turn or junction. By carefully designing the geometries of these regions, sample dispersion in turns and junctions is reduced to levels comparable to the effects of ordinary diffusion. A numerical algorithm was employed to evolve low-dispersion geometries by computing the electric or pressure field within candidate configurations, sample transport through the turn or junction, and the overall effective dispersion. These devices should greatly increase flexibility in the design of microchannel devices by permitting the use of turns and junctions that do not induce large sample dispersion. In particular, the ability to fold electrophoretic and electrochrornatographic separation columns will allow dramatic improvements in the miniaturization of these devices. The low-lispersion devices are particularly suited to electrochromatographic and electrophoretic separations, as well as pressure-driven chromatographic separation. They are further applicable to microfluidic systems employing either electroosrnotic or pressure-driven flows for sample transport, reaction, mixing, dilution or synthesis.

Griffiths, Stewart K. (Danville, CA); Nilson, Robert H. (Cardiff-by-the-Sea, CA)

2001-01-01T23:59:59.000Z

468

New Environmentally Friendly Dispersants for High Temperature Invert-Emulsion Drilling Fluids Weighted by Manganese Tetraoxide  

E-Print Network (OSTI)

This thesis provides a detailed evaluation of different environmentally friendly dispersants in invert-emulsion drilling fluids that can be used to drill wells under difficult conditions such as HPHT. The drilling fluid is weighted by manganese tetraoxide (Mn3O4) particles, which have a specific gravity of 4.8 and a mean particle diameter of ca1 micrometers. Manganese tetraoxide has different wetting properties and surface chemistry than other weighting agents. Hence, there is a need to find dispersants for manganese tetraoxide that give reduced sag, reduced rheology, and low fluid-loss at HPHT conditions. This is particularly important for deep wells with narrow operating windows between pore-pressure and fracture pressure gradients. The stricter global environmental regulations mandated the dispersants to be environmentally friendly, e.g. within OCNS group D or E. First, oil compatibility tests and particle settling time experiments were conducted on 31 dispersants. From the experiments, we identified 3 oil-compatible dispersants that gave the longest settling time in base oil and belonged to OCNS group D. We investigated the effectiveness of selected chemicals in dispersing manganese tetraoxide at HPHT conditions. 1.95 and 2.4 S.G. drilling fluid samples were first prepared and tested without any contaminant and then in the presence of rev dust and cement as contaminants. Drilling fluid samples were statically aged at 400 degrees F and 500 psi for 16 hours. Sag and rheological measurements were taken before and after aging to determine the effect of HPHT conditions on fluid properties. Then, HPHT dynamic filtration tests were done at 500 psi differential pressure and 300 degrees F to determine HPHT dynamic fluid-loss. We have found that one of the dispersants (nonionic) gives low rheology and reduced sag before and after static aging. It also gives the lowest fluid-loss of the selected dispersants. For 2.4 S.G. fluid without contaminants, 10-minute gel strength was reduced from 50 to 32 lb/100 ft^2, plastic viscosity from 37 to 25 cp, sag from 0.249 to 0.135 lbm/gal, and fluid-loss was reduced from 44.4 to 39.6 cm^3 with the addition of dispersant. This dispersant prevents agglomeration of particles, thereby reducing fluid rheology, sag, and fluid-loss.

Rehman, Abdul

2011-12-01T23:59:59.000Z

469

Liquefied Natural Gas (LNG) Vapor Dispersion Modeling with Computational Fluid Dynamics Codes  

E-Print Network (OSTI)

Federal regulation 49 CFR 193 and standard NFPA 59A require the use of validated consequence models to determine the vapor cloud dispersion exclusion zones for accidental liquefied natural gas (LNG) releases. For modeling purposes, the physical process of dispersion of LNG release can be simply divided into two stages: source term and atmospheric dispersion. The former stage occurs immediately following the release where the behavior of fluids (LNG and its vapor) is mainly controlled by release conditions. After this initial stage, the atmosphere would increasingly dominate the vapor dispersion behavior until it completely dissipates. In this work, these two stages are modeled separately by a source term model and a dispersion model due to the different parameters used to describe the physical process at each stage. The principal focus of the source term study was on LNG underwater release, since there has been far less research conducted in developing and testing models for the source of LNG release underwater compared to that for LNG release onto land or water. An underwater LNG release test was carried out to understand the phenomena that occur when LNG is released underwater and to determine the characteristics of pool formation and the vapor cloud generated by the vaporization of LNG underwater. A mathematical model was used and validated against test data to calculate the temperature of the vapor emanating from the water surface. This work used the ANSYS CFX, a general-purpose computational fluid dynamics (CFD) package, to model LNG vapor dispersion in the atmosphere. The main advantages of CFD codes are that they have the capability of defining flow physics and allowing for the representation of complex geometry and its effects on vapor dispersion. Discussed are important parameters that are essential inputs to the ANSYS CFX simulations, including the mesh size and shape, atmospheric conditions, turbulence from the source term, ground surface roughness height, and effects of obstacles. A sensitivity analysis was conducted to illustrate the impact of key parameters on the accuracy of simulation results. In addition, a series of medium-scale LNG spill tests have been performed at the Brayton Fire Training Field (BFTF), College Station, TX. The objectives of these tests were to study key parameters of modeling the physical process of LNG vapor dispersion and collect data for validating the ANSYS CFX prediction results. A comparison of test data with simulation results demonstrated that CFX described the physical behavior of LNG vapor dispersion well, and its prediction results of distances to the half lower flammable limit were in good agreement with the test data.

Qi, Ruifeng

2011-08-01T23:59:59.000Z

470

Analysis Of Residence Time Distribution Of Fluid Flow By Axial Dispersion Model  

Science Conference Proceedings (OSTI)

Radioactive tracer {sup 82}Br in the form of KBr-82 with activity {+-} 1 mCi has been injected into steel pipeline to qualify the extent dispersion of water flowing inside it. Internal diameter of the pipe is 3 in. The water source was originated from water tank through which the water flow gravitically into the pipeline. Two collimated sodium iodide detectors were used in this experiment each of which was placed on the top of the pipeline at the distance of 8 and 11 m from injection point respectively. Residence time distribution (RTD) curves obtained from injection of tracer are elaborated numerically to find information of the fluid flow properties. The transit time of tracer calculated from the mean residence time (MRT) of each RTD curves is 14.9 s, therefore the flow velocity of the water is 0.2 m/s. The dispersion number, D/uL, for each RTD curve estimated by using axial dispersion model are 0.055 and 0.06 respectively. These calculations are performed after fitting the simulated axial dispersion model on the experiment curves. These results indicated that the extent of dispersion of water flowing in the pipeline is in the category of intermediate.

Sugiharto [Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132 (Indonesia); Centre for Applications of Isotopes and Radiation Technology-National Nuclear Energy Agency, Jl. Lebak Bulus Raya No. 49, Jakarta 12440 (Indonesia); Su'ud, Zaki; Kurniadi, Rizal; Waris, Abdul [Centre for Applications of Isotopes and Radiation Technology-National Nuclear Energy Agency, Jl. Lebak Bulus Raya No. 49, Jakarta 12440 (Indonesia); Abidin, Zainal [Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132 (Indonesia)

2010-12-23T23:59:59.000Z

471

Primordial r-process Dispersion in Metal-Poor Globular Clusters  

E-Print Network (OSTI)

Heavy elements, those produced by neutron-capture reactions, have traditionally shown no star-to-star dispersion in all but a handful of metal-poor globular clusters (GCs). Recent detections of low [Pb/Eu] ratios or upper limits in several metal-poor GCs indicate that the heavy elements in these GCs were produced exclusively by an r-process. Reexamining GC heavy element abundances from the literature, we find unmistakable correlations between the [La/Fe] and [Eu/Fe] ratios in 4 metal-poor GCs (M5, M15, M92, and NGC 3201), only 2 of which were known previously. This indicates that the total r-process abundances vary star-to-star (by factors of 2-6) relative to Fe within each GC. We also identify potential dispersion in two other GCs (M3 and M13). Several GCs (M12, M80, and NGC 6752) show no evidence of r-process dispersion. The r-process dispersion is not correlated with the well-known light element dispersion, indicating it was present in the gas throughout the duration of star formation. The observations ava...

Roederer, Ian U

2011-01-01T23:59:59.000Z

472

Stellar velocity dispersions and emission line properties of SDSS-III/BOSS galaxies  

E-Print Network (OSTI)

We perform a spectroscopic analysis of 492,450 galaxy spectra from the first two years of observations of the Sloan Digital Sky Survey-III/Baryonic Oscillation Spectroscopic Survey (BOSS) collaboration. This data set is released in the ninth SDSS data release in July 2012, the first public data release of BOSS spectra. We show that the typical signal-to-noise ratio of BOSS spectra, despite being low, is sufficient to measure stellar velocity dispersion and emission line fluxes for individual objects. We show that the typical velocity dispersion of a BOSS galaxy is ~240 km/s. The typical error in the velocity dispersion measurement 14 per cent, and 93 per cent of BOSS galaxies have velocity dispersions with an accuracy of better than 30 per cent. The distribution in velocity dispersion is redshift independent between redshifts 0.15 and 0.7, which reflects the survey design targeting massive galaxies with an approximately uniform mass distribution in this redshift interval. The majority of BOSS galaxies lack de...

Thomas, D; Maraston, C; Johansson, J; Beifiori, A; Pforr, J; Strombaeck, G; Tremonti, C A; Wake, D; Bizyaev, D; Bolton, A; Brewington, H; Browstein, J R; Comparat, J; Kneib, J P; Malanushenko, E; Malanushenko, V; Oravetz, D; Pan, K; Parejko, J K; Schneider, D P; Shelden, A; Simmons, A; Snedden, S; Tanaka, M; Weaver, B A; Yan, R

2012-01-01T23:59:59.000Z

473

Update 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

2 to: A Dispersion Modeling Analysis of Downwash from 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions at Maximum and Minimum Loads Update 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions at Maximum and Minimum Loads Docket No. EO-05-01. This report describes AERMOD modeling results performed for Unit 1 at Mirant's Potomac River Generating Station. The purpose of these runs was to demonstrate that operation of Unit 1 for 24 hours a day loads from 35MW to 88 MW with the use of trona to reduce SO2 emissions will not cause or contribute to modeled excceedences of the National Ambient Air Quality Standards (NAAQS). Mirant proposes to use trona on an as needed basis to limit SO2 emissions to less than

474

Weak dispersive forces between glass-gold macroscopic surfaces in alcohols  

E-Print Network (OSTI)

In this work we concentrate on an experimental validation of the Lifshitz theory for van der Waals and Casimir forces in gold-alcohol-glass systems. From this theory weak dispersive forces are predicted when the dielectric properties of the intervening medium become comparable to one of the interacting surfaces. Using inverse colloid probe atomic force microscopy dispersive forces were measured occasionally and under controlled conditions by addition of salt to screen the electrostatic double layer force if present. The dispersive force was found to be attractive, and an order of magnitude weaker than that in air. Although the theoretical description of the forces becomes less precise for these systems even with full knowledge of the dielectric properties, we find still our results in reasonable agreement with Lifshitz theory.

P. J. van Zwol; G. Palasantzas; J. Th. M. DeHosson

2009-04-03T23:59:59.000Z

475

Pion-pair formation and the pion dispersion relation in a hot pion gas  

E-Print Network (OSTI)

The possibility of pion--pair formation in a hot pion gas, based on the bosonic gap equation, is pointed out and discussed in detail. The critical temperature for condensation of pion pairs (Evans--Rashid transition) is determined as a function of the pion density. As for fermions, this phase transition is signaled by the appearance of a pole in the two--particle propagator. In bose systems there exists a second, lower critical temperature, associated with the appearance of the single--particle condensate. Between the two critical temperatures the pion dispersion relation changes from the usual quasiparticle dispersion to a Bogoliubov--like dispersion relation at low momenta. This generalizes the non-relativistic result for an attractive bose gas by Evans et al. Possible consequences for the inclusive pion spectra measured in heavy--ion collisions at ultra--relativistic energies are discussed.

T. Alm; G. Chanfray; P. Schuck; G. Welke

1996-09-13T23:59:59.000Z

476

Laser capillary spectrophotometric acquisition of bivariate drop size and concentration data for liquid-liquid dispersion  

DOE Patents (OSTI)

A laser capillary spectrophotometric technique measures real time or near real time bivariate drop size and concentration distribution for a reactive liquid-liquid dispersion system. The dispersion is drawn into a precision-bore glass capillary and an appropriate light source is used to distinguish the aqueous phase from slugs of the organic phase at two points along the capillary whose separation is precisely known. The suction velocity is measured, as is the length of each slug from which the drop free diameter is calculated. For each drop, the absorptivity at a given wavelength is related to the molar concentration of a solute of interest, and the concentration of given drops of the organic phase is derived from pulse heights of the detected light. This technique permits on-line monitoring and control of liquid-liquid dispersion processes. 17 figures.

Tavlarides, L.L.; Bae, J.H.

1991-12-24T23:59:59.000Z

477

Kinetics of oil dispersion in the absence and presence of block copolymers  

Science Conference Proceedings (OSTI)

Dispersion of oil into fine droplets is important in many applications, such as flotation, selective agglomeration, solvent extraction, wastewater treatment, and oil drilling. Size distribution of oil droplets determines the rate of mass transfer between the continuous and the disperse phase and the outcome of the process in these applications. A phenomenological model proposed describes droplet breakup in the turbulently agitated lean oil-in-water dispersions and provides a correlation between the median droplet size in an agitated vessel of standard geometry and the time of dispersion. It was assumed that the droplet breakup takes place in the dispersion-only region and coalescence is negligible. The model described the data from this study and the literature quite satisfactorily under these conditions. The effect of adding triblock PEO/PPO/PEO copolymeric surfactants on the dispersion kinetics of oil was also investigated. Addition of surfactant reduced the median oil droplet size significantly, and the extent of this reduction was a strong function of surfactant concentration. Application of the model on these data demonstrated that the change in the median droplet size could be divided into two distinct regions. The breakage rate was high initially, most probably due to continuous adsorption of surfactant molecules at the oil/water interface. A lower breakage rate was attained at longer times, as the surfactant molecules were depleted from the solution. The time of transition between the two was affected strongly by the concentration of the surfactant added. Furthermore, the time of addition of the surfactant did not affect the final droplet-size distribution in the system.

Polat, H. [Izmir Inst. of Tech. (Turkey). Dept. of Chemistry] [Izmir Inst. of Tech. (Turkey). Dept. of Chemistry; Polat, M. [Dokuz Eyluel Univ., Izmir (Turkey). Mining Engineering Dept.] [Dokuz Eyluel Univ., Izmir (Turkey). Mining Engineering Dept.; Chander, S. [Pennsylvania State Univ., University Park, PA (United States). Dept. of Energy and Geo-Environmental Engineering] [Pennsylvania State Univ., University Park, PA (United States). Dept. of Energy and Geo-Environmental Engineering

1999-08-01T23:59:59.000Z

478

Impact of dispersed solar and wind systems on electric distribution planning and operation  

SciTech Connect

Small-scale dispersed solar photovoltaic and wind generation (DSW) will affect the generation, transmission, and distribution systems of an electric utility. This study examines the technical and economic impacts of dispersing DSW devices within the distribution system. Dispersed intermittent generation is included. Effects of DSW devices on capital investments, reliability, operating and maintenance costs, protection requirements, and communication and control requirements are examined. A DSW operation model is developed to help determine the dependable capacity of fluctuating solar photovoltaic and wind generation as part of the distribution planning process. Specific case studies using distribution system data and renewable resource data for Southern California Edison Company and Consumers Power Company are analyzed to gain insights into the effects of interconnecting DSW devices. The DSW devices were found to offer some distribution investment savings, depending on their availability during peak loads. For a summer-peaking utility, for example, dispersing photovoltaic systems is more likely to defer distribution capital investments than dispersing wind systems. Dispersing storage devices to increase DSW's dependable capacity for distribution systems needs is not economically attractive. Substation placement of DSW and storage devices is found to be more cost effective than feeder or customer placement. Examination of the effects of DSW on distribution system operation showed that small customer-owned DSW devices are not likely to disrupt present time-current distribution protection coordination. Present maintenance work procedures, are adequate to ensure workmen's safety. Regulating voltages within appropriate limits will become more complex with intermittent generation along the distribution feeders.

Boardman, R.W.; Patton, R.; Curtice, D.H.

1981-02-01T23:59:59.000Z

479

Initial Dispersant Application in the Condensate / Feedwater Line During Long-Path Recirculation Cleanup at Byron Unit 1  

Science Conference Proceedings (OSTI)

Dispersants have been used for decades in fossil boiler units to inhibit corrosion product deposition. As a means of reducing the rate of particulate fouling within steam generators (SGs), online dispersant technology adds a potentially powerful tool by dramatically increasing the blowdown iron removal efficiency. Additional significant benefit in the form of reduced corrosion product transport during startup may be obtained through applying dispersant in other (offline) operational modes. This report pr...

2011-12-14T23:59:59.000Z

480

Array of aligned and dispersed carbon nanotubes and method of producing the array  

DOE Patents (OSTI)

An array of aligned and dispersed carbon nanotubes includes an elongate drawn body including a plurality of channels extending therethrough from a first end to a second end of the body, where the channels have a number density of at least about 100,000 channels/mm.sup.2 over a transverse cross-section of the body. A plurality of carbon nanotubes are disposed in each channel, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 .OMEGA.m or less.

Ivanov, Ilia N; Simpson, John T; Hendricks, Troy R

2013-06-11T23:59:59.000Z

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481

Array of aligned and dispersed carbon nanotubes and method of producing the array  

DOE Patents (OSTI)

An array of aligned and dispersed carbon nanotubes includes an elongate drawn body including a plurality of channels extending therethrough from a first end to a second end of the body, where the channels have a number density of at least about 100,000 channels/mm.sup.2 over a transverse cross-section of the body. A plurality of carbon nanotubes are disposed in each channel, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 .OMEGA.m or less.

Ivanov, Ilia N. (Knoxville, TN); Simpson, John T. (Clinton, TN); Hendricks, Troy R. (Knoxville, TN)

2012-06-19T23:59:59.000Z

482

DISPERSION ELEMENT CONSISTING OF CHROMIUM COATED UO$sup 2$ PARTICLES UNIFORMLY DISTRIBUTED IN A ZIRCALOY MATRIX  

DOE Patents (OSTI)

A nuclear fuel element consisting of metal coated UO/sub 2/ particles dispersed in a matrix of Zircalloy and having a cladding of Zircalloy is presented. (AEC)

Cain, F.M. Jr.; Eck, J.E.

1963-05-01T23:59:59.000Z

483

Perforating System for Geothermal Applications Geothermal Project...  

Open Energy Info (EERE)

EGS Research, Development and Demonstration technical plan, this project will focus on developing technologies required for engineering wells to enable stimulation and ensuring...

484

Dispersion equation and eigenvalues for quantum wells using spectral parameter power series  

Science Conference Proceedings (OSTI)

We derive a dispersion equation for determining eigenvalues of inhomogeneous quantum wells in terms of spectral parameter power series and apply it for the numerical treatment of eigenvalue problems. The method is algorithmically simple and can be easily implemented using available routines of such environments for scientific computing as MATLAB.

Castillo-Perez, Raul; Oviedo-Galdeano, Hector; Rabinovich, Vladimir S. [SEPI, ESIME, National Polytechnic Institute, Av. IPN S/N, C.P. 07738, Mexico City (Mexico); Kravchenko, Vladislav V. [Department of Mathematics, CINVESTAV del IPN, Campus Queretaro, Apartado Postal 1-798, Arteaga 5, Col. Centro, Santiago de Queretaro, Qro., 76001 (Mexico)

2011-04-15T23:59:59.000Z

485

The Effect of Wind on the Dispersal of the Hudson River Plume  

Science Conference Proceedings (OSTI)

The dispersal of the Hudson River plume in response to idealized wind forcing is studied using a three-dimensional model. The model domain includes the Hudson River and its estuary, with a realistic coastline and bottom topography of the New York ...

Byoung-Ju Choi; John L. Wilkin

2007-07-01T23:59:59.000Z

486

Distributed data possession checking for securing multiple replicas in geographically-dispersed clouds  

Science Conference Proceedings (OSTI)

Distributing multiple replicas in geographically-dispersed clouds is a popular approach to reduce latency to users. It is important to ensure that each replica should have availability and data integrity features; that is, the same as the original data ... Keywords: Cloud computing, Complete bidirectional directed graph, Data security, Multiple replicas data possession checking, Optimal spanning tree

Jing He; Yanchun Zhang; Guangyan Huang; Yong Shi; Jie Cao

2012-09-01T23:59:59.000Z

487

Method for removing and decolorizing aqueous waste effluents containing dissolved or dispersed organic matter  

DOE Patents (OSTI)

A method is provided for treating organic waste material dissolved or dispersed in an aqueous effluent, which comprises contacting the effluent with an inert particulate carbonaceous sorbent at an oxygen pressure up to 2000 psi, irradiating the resultant mixture with high energy radiation until a decolorized liquid is produced, and then separating the decolorized liquid.

Case, F.N.; Ketchen, E.E.

1975-10-14T23:59:59.000Z

488

A computational study of axial dispersion in segmented gas-liquid flow Metin Muradoglua  

E-Print Network (OSTI)

A computational study of axial dispersion in segmented gas-liquid flow Metin Muradoglua Department-dimensional gas-liquid flow is studied computationally using a finite-volume/front-tracking method. The effects models. © 2007 American Institute of Physics. DOI: 10.1063/1.2750295 I. INTRODUCTION Segmented gas-liquid

Muradoglu, Metin

489

VAN DER WAALS DISPERSION FORCE CONTRIBUTION TO THE INTERFACIAL FREE ENERGY  

E-Print Network (OSTI)

VAN DER WAALS DISPERSION FORCE CONTRIBUTION TO THE INTERFACIAL FREE ENERGY OF NEMATIC LIQUID energy of a nematic liquid crystal and the interfacial free energy of a nematic on a glass substrate. Introduction. -- The surface free energy of a nematic liquid crystal and the interfacial free energy of nematic

Paris-Sud XI, Université de

490

A Numerical Investigation of Tetroon versus Fluid Particle Dispersion in the Convective Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

Data from Deardorff's (1974) turbulence model are used in simulations of fluid particle and tetroon dispersion in the convective atmospheric boundary layer with ?h/L ? 1, where h is the mixed-layer depth. It is found that the lateral spread ?y(t) ...

Robert G. Lamb

1981-04-01T23:59:59.000Z

491

Asymptotic distribution of Wishart matrix for block-wise dispersion of population eigenvalues  

Science Conference Proceedings (OSTI)

This paper deals with the asymptotic distribution of Wishart matrix and its application to the estimation of the population matrix parameter when the population eigenvalues are block-wise infinitely dispersed. We show that the appropriately normalized ... Keywords: Stein's loss, 62C20, 62H10, Asymptotic risk, Covariance matrix, Quadratic loss, Wishart distribution

Yo Sheena; Akimichi Takemura

2008-04-01T23:59:59.000Z

492

Sound beyond the speed of light: destructive interference, anomalous dispersion and nonlocality of near field  

E-Print Network (OSTI)

Experimentally fixed sound pulse beyond of light speed in the region of anomalous dispersion [W. M. Robertson, e. a. Appl. Phys. Lett, 90, 014102 (2007)] can be explained, as well as the similar superluminal phenomena, by "the nonlocality in the small" of near electromagnetic field at transferring of relevanted excitations.

Perel'man, M E

2007-01-01T23:59:59.000Z

493

Neutrino self-energy and dispersion in a medium with magnetic field  

E-Print Network (OSTI)

We calculate the one-loop thermal self-energy of a neutrino in a constant and homogeneous magnetic field to all orders in the magnetic field strength using Schwinger's proper time method. We obtain the dispersion relation under various conditions.

A. Erdas; C. W. Kim; T. H. Lee

1998-04-17T23:59:59.000Z

494

Flow Boundaries in Random-Flight Dispersion Models: Enforcing the Well-Mixed Condition  

Science Conference Proceedings (OSTI)

Lagrangian stochastic (LS) dispersion models often use trajectory reflection to limit the domain accessible to a particle. It is shown how the well-mixed condition (Thomson) can he expressed in the Chapman-Kolmogorov equation for a discrete-time ...

John D. Wilson; Thomas K. Flesch

1993-11-01T23:59:59.000Z

495

Tropical Cyclogenesis Associated with Rossby Wave Energy Dispersion of a Preexisting Typhoon. Part II: Numerical Simulations  

Science Conference Proceedings (OSTI)

The cyclogenesis events associated with the tropical cyclone (TC) energy dispersion are simulated in a 3D model. A new TC with realistic dynamic and thermodynamic structures forms in the wake of a preexisting TC when a large-scale monsoon gyre or ...

Tim Li; Xuyang Ge; Bin Wang; Yongti Zhu

2006-05-01T23:59:59.000Z

496

Two and three-body interatomic dispersion energy contributions to binding in molecules and solids.  

SciTech Connect

We present numerical estimates of the leading two- and three-body dispersion energy terms in van der Waals interactions for a broad variety of molecules and solids. The calculations are based on London and Axilrod-Teller-Muto expressions where the required interatomic dispersion energy coefficients, C{sub 6} and C{sub 9}, are computed 'on the fly' from the electron density. Inter- and intramolecular energy contributions are obtained using the Tang-Toennies (TT) damping function for short interatomic distances. The TT range parameters are equally extracted on the fly from the electron density using their linear relationship to van der Waals radii. This relationship is empiricially determined for all the combinations of He-Xe rare gas dimers, as well as for the He and Ar trimers. The investigated systems include the S22 database of noncovalent interactions, Ar, benzene and ice crystals, bilayer graphene, C{sub 60} dimer, a peptide (Ala{sub 10}), an intercalated drug-DNA model [ellipticine-d(CG){sub 2}], 42 DNA base pairs, a protein (DHFR, 2616 atoms), double stranded DNA (1905 atoms), and 12 molecular crystal polymorphs from crystal structure prediction blind test studies. The two- and three-body interatomic dispersion energies are found to contribute significantly to binding and cohesive energies, for bilayer graphene the latter reaches 50% of experimentally derived binding energy. These results suggest that interatomic three-body dispersion potentials should be accounted for in atomistic simulations when modeling bulky molecules or condensed phase systems.

von Lilienfeld-Toal, Otto Anatole; Tkatchenko, Alexandre (Fritz-Haber-Institute)

2010-03-01T23:59:59.000Z

497

ATMOSPHERIC DISPERSION COEFFICIENTS AND RADIOLOGICAL AND TOXICOLOGICAL EXPOSURE METHODOLOGY FOR USE IN TANK FARMS  

Science Conference Proceedings (OSTI)

This report presents the atmospheric dispersion coefficients used in Tank Farms safety analysis. The basis equations for calculating radiological and toxicological exposures are also included. In this revision, the time averaging for toxicological consequence evaluations is clarified based on a review of DOE complex guidance and a review of tank farm chemicals.

GRIGSBY KM

2011-04-07T23:59:59.000Z

498

Versatile Lidar for Atmospheric Studies, Including Plume Dispersion, Clouds, and Stratospheric Aerosol  

Science Conference Proceedings (OSTI)

A transportable scanning lidar for studying clouds, plume dispersion, and stratospheric aerosal at any of three wavelengths is described. A ruby laser transmits linearly polarized light of 694.3 nm wavelength at a maximum 0.8 s?1 pulse rate. The ...

W. L. Eberhard; G. T. Mcnice

1986-12-01T23:59:59.000Z

499

Free energy landscapes and volumes of coexisting phases for a colloidal dispersion  

E-Print Network (OSTI)

Free energy landscapes and volumes of coexisting phases for a colloidal dispersion Trinh Hoa Lang are the ultimate target, we employ the free energy density minimization approach G. F. Wang and S. K. Lai, Phys. In this work, we first examine the change in structures of the fluid and solid free energy density landscapes

500

The Simulation Research on Pollutant Dispersion Provoked by Wind-driven Currents  

Science Conference Proceedings (OSTI)

The ocean dumps from offshore industries of coastal areas will affect the adjacent water in physics, chemistry, biology and so on. The paper uses ECOM 3D model for the cultural paper of Stora Enso Guangxi Forest-Pulp-and-Paper Co., LTD for analyzing ... Keywords: pollutant dispersion, numerical simulation, wind-driven currents

Ying Wang; Guangyu Zhang

2012-05-01T23:59:59.000Z