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Note: This page contains sample records for the topic "gas tungsten arc" 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.


1

Gas tungsten arc welder with electrode grinder  

DOE Patents [OSTI]

A welder for automated closure of fuel pins by a gas tungsten arc process in which a rotating length of cladding is positioned adjacent a welding electrode in a sealed enclosure. An independently movable axial grinder is provided in the enclosure for refurbishing the used electrode between welds.

Christiansen, David W. (Kennewick, WA); Brown, William F. (West Richland, WA)

1984-01-01T23:59:59.000Z

2

A Glove Box Enclosed Gas-Tungsten Arc Welding System  

SciTech Connect (OSTI)

This report describes an inert atmosphere enclosed gas-tungsten arc welding system which has been assembled in support of the MC2730, MC2730A and MC 3500 Radioisotope Thermoelectric Generator (RTG) Enhanced Surveillance Program. One goal of this program is to fabricate welds with microstructures and impurity levels which are similar to production heat source welds previously produced at Los Alamos National Laboratory and the Mound Facility. These welds will subsequently be used for high temperature creep testing as part of the overall component lifetime assessment. In order to maximize the utility of the welding system, means for local control of the arc atmosphere have been incorporated and a wide range of welding environments can easily be evaluated. The gas-tungsten arc welding system used in the assembly is computer controlled, includes two-axis and rotary motion, and can be operated in either continuous or pulsed modes. The system can therefore be used for detailed research studies of welding impurity effects, development of prototype weld schedules, or to mimic a significant range of production-like welding conditions. Fixturing for fabrication of high temperature creep test samples have been designed and constructed, and weld schedules for grip-tab and test welds have been developed. The microstructure of these welds have been evaluated and are consistent with those used during RTG production.

Reevr, E, M; Robino, C.V.

1999-07-01T23:59:59.000Z

3

Visible Light Emissions during Gas Tungsten Arc Welding and Its Application to Weld  

E-Print Network [OSTI]

\\ Visible Light Emissions during Gas Tungsten· Arc Welding and Its Application to Weld Image. EAGAR ABSTRACT. An experimental study was carried out to map the light emissions from a gas tungsten arc. The emissions were found to be dramat- ically different with different shielding gases, welding current and base

Eagar, Thomas W.

4

Causal Factors of Weld Porosity in Gas Tungsten Arc Welding of Powder Metallurgy Produced Titanium Alloys  

SciTech Connect (OSTI)

ORNL undertook an investigation using gas tungsten arc (GTA) welding on consolidated powder metallurgy (PM) titanium (Ti) plate, to identify the causal factors behind observed porosity in fusion welding. Tramp element compounds of sodium and magnesium, residual from the metallothermic reduction of titanium chloride used to produce the titanium, were remnant in the starting powder and were identified as gas forming species. PM-titanium made from revert scrap where sodium and magnesium were absent, showed fusion weld porosity, although to a lesser degree. We show that porosity was attributable to hydrogen from adsorbed water on the surface of the powders prior to consolidation. The removal / minimization of both adsorbed water on the surface of titanium powder and the residues from the reduction process prior to consolidation of titanium powders, are critical to achieve equivalent fusion welding success similar to that seen in wrought titanium produced via the Kroll process.

Muth, Thomas R [ORNL; Yamamoto, Yukinori [ORNL; Frederick, David Alan [ORNL; Contescu, Cristian I [ORNL; Chen, Wei [ORNL; Lim, Yong Chae [ORNL; Peter, William H [ORNL; Feng, Zhili [ORNL

2013-01-01T23:59:59.000Z

5

Electrochemical Testing of Gas Tungsten ARC Welded and Reduced Pressure Electron Beam Welded Alloy 22  

SciTech Connect (OSTI)

Alloy 22 (N06022) is the material selected for the fabrication of the outer shell of the nuclear waste containers for the Yucca Mountain high-level nuclear waste repository site. A key technical issue in the waste package program has been the integrity of the container weld joints. The currently selected welding process for fabricating and sealing the containers is the traditional gas tungsten arc welding (GTAW) or TIC method. An appealing faster alternative technique is reduced pressure electron beam (RPEB) welding. It was of interest to compare the corrosion properties of specimens prepared using both types of welding techniques. Standard electrochemical tests were carried on GTAW and RPEB welds as well as on base metal (non-welded) to determine their relative corrosion behavior in simulated concentrated water (SCW) at 90 C (alkaline), 1 M HCI at 60 C (acidic) and 1 M NaCl at 90 C (neutral) solutions. Results show that for all practical purposes, the three tested materials had the same electrochemical behavior in the three tested electrolytes.

S. Daniel Day; Frank M.G. Wong; Steven R. Gordon; Lana L. Wong; Raul B. Rebak

2006-05-08T23:59:59.000Z

6

Analysis of effect of temperature gradients on surface-tension phenomena in gas-tungsten-arc welds  

SciTech Connect (OSTI)

Fluid motion directed by surface tension is considered as a contributor to heat penetration in a weld pool. The potential phenomena at the gas-liquid interface were analyzed, and the dependence of surface motion on temperature in the gas-tungsten-arc (GTA) welding process was examined. An existing heat-transfer model was used and was able to predict weld size to +- 50% of the actual value. A momentum-transfer equation was derived by considering the contribution of Lorentz force. The momentum boundary condition was developed and was able to predict the Marangoni effect. The magnitude of surface-tension-driven force is comparable to the gravitational force on one gram. An empirical approach was proposed to couple heat-transfer and momentum-transfer phenomena. A dimensional analysis identified the pertinent dimensionless groups as Reynolds, Weber, Froude, Peclet, and Power numbers and a dimensionless velocity. A simplified form of the correction was developed by combining dimensionless groups to yield a correlation with the Bond, Prandtl, and modified power numbers. Future experimental work was proposed to test the functionality of the dimensionless groups.

Lee, H.A.; Chien, P.S.J.

1982-10-01T23:59:59.000Z

7

Surface preparation effects on GTA (gas tungsten arc) weld penetration in JBK-75 stainless steel  

SciTech Connect (OSTI)

The results of a study are reported here on the effects of surface preparation on the shape of GTA welds on JBK-75, an austenitic precipitation hardenable stainless steel similar to A286. Minor changes in surface (weld groove) preparation produced substantial changes in the penetration characteristics and welding behavior of this alloy. Increased and more consistent weld penetration (higher d/w ratios) along with improved arc stability and less arc wander result from wire brushing and other abrasive surface preparations, although chemical and machining methods did not produce any improvement in penetration. Abrasive treatments roughen the surface, increase the surface area, and increase the surface oxide thickness. The increased weld d/w ratio is attributed to oxygen added to the weld pool from the surface oxide on the base metal. The added oxygen alters the surface-tension driven fluid flow pattern in the weld pool. Similar results were observed with changes in filler wire surface oxide thickness, caused by changes in wire production conditions. 15 refs., 14 figs., 4 tabs.

Campbell, R.D.; Heiple, C.R.; Sturgill, P.L.; Robertson, A.M.; Jamsay, R.

1989-01-01T23:59:59.000Z

8

Welding arc initiator  

DOE Patents [OSTI]

An improved inert gas shielded tungsten arc welder is disclosed of the type wherein a tungsten electrode is shielded within a flowing inert gas, and, an arc, following ignition, burns between the energized tungsten electrode and a workpiece. The improvement comprises in combination with the tungsten electrode, a starting laser focused upon the tungsten electrode which to ignite the electrode heats a spot on the energized electrode sufficient for formation of a thermionic arc. Interference problems associated with high frequency starters are thus overcome. 3 figs.

Correy, T.B.

1989-05-09T23:59:59.000Z

9

Welding arc initiator  

DOE Patents [OSTI]

An improved inert gas shielded tungsten arc welder is disclosed of the type wherein a tungsten electrode is shielded within a flowing inert gas, and, an arc, following ignition, burns between the energized tungsten electrode and a workpiece. The improvement comprises in combination with the tungsten electrode, a starting laser focused upon the tungsten electrode which to ignite the electrode heats a spot on the energized electrode sufficient for formation of a thermionic arc. Interference problems associated with high frequency starters are thus overcome.

Correy, Thomas B. (Richland, WA)

1989-01-01T23:59:59.000Z

10

Method for gas-metal arc deposition  

DOE Patents [OSTI]

Method and apparatus for gas-metal arc deposition of metal, metal alloys, and metal matrix composites. The apparatus contains an arc chamber for confining a D.C. electrical arc discharge, the arc chamber containing an outlet orifice in fluid communication with a deposition chamber having a deposition opening in alignment wiht the orifice for depositing metal droplets on a coatable substrate. Metal wire is passed continuously into the arc chamber in alignment with the orifice. Electric arcing between the metal wire anode and the orifice cathode produces droplets of molten metal from the wire which pass through the orifice and into the deposition chamber for coating a substrate exposed at the deposition opening. When producing metal matrix composites, a suspension of particulates in an inert gas enters the deposition chamber via a plurality of feed openings below and around the orifice so that reinforcing particulates join the metal droplets to produce a uniform mixture which then coats the exposed substrate with a uniform metal matrix composite.

Buhrmaster, Carol L. (Corning, NY); Clark, Denis E. (Idaho Falls, ID); Smartt, Herschel B. (Idaho Falls, ID)

1990-01-01T23:59:59.000Z

11

Method for gas-metal arc deposition  

DOE Patents [OSTI]

Method and apparatus for gas-metal arc deposition of metal, metal alloys, and metal matrix composites are disclosed. The apparatus contains an arc chamber for confining a D.C. electrical arc discharge, the arc chamber containing an outlet orifice in fluid communication with a deposition chamber having a deposition opening in alignment with the orifice for depositing metal droplets on a coatable substrate. Metal wire is passed continuously into the arc chamber in alignment with the orifice. Electric arcing between the metal wire anode and the orifice cathode produces droplets of molten metal from the wire which pass through the orifice and into the deposition chamber for coating a substrate exposed at the deposition opening. When producing metal matrix composites, a suspension of particulates in an inert gas enters the deposition chamber via a plurality of feed openings below and around the orifice so that reinforcing particulates join the metal droplets to produce a uniform mixture which then coats the exposed substrate with a uniform metal matrix composite. 1 fig.

Buhrmaster, C.L.; Clark, D.E.; Smartt, H.B.

1990-11-13T23:59:59.000Z

12

Apparatus for gas-metal arc deposition  

DOE Patents [OSTI]

Apparatus for gas-metal arc deposition of metal, metal alloys, and metal matrix composites. The apparatus contains an arc chamber for confining a D.C. electrical arc discharge, the arc chamber containing an outlet orifice in fluid communication with a deposition chamber having a deposition opening in alignment with the orifice for depositing metal droplets on a coatable substrate. Metal wire is passed continuously into the arc chamber in alignment with the orifice. Electric arcing between the metal wire anode and the orifice cathode produces droplets of molten metal from the wire which pass through the orifice and into the deposition chamber for coating a substrate exposed at the deposition opening. When producing metal matrix composites, a suspenion of particulates in an inert gas enters the deposition chamber via a plurality of feed openings below and around the orifice so that reinforcing particulates join the metal droplets to produce a uniform mixture which then coats the exposed substrate with a uniform metal matrix composite.

Buhrmaster, Carol L. (Corning, NY); Clark, Denis E. (Idaho Falls, ID); Smartt, Herschel B. (Idaho Falls, ID)

1991-01-01T23:59:59.000Z

13

Sensing the gas metal arc welding process  

SciTech Connect (OSTI)

Control of gas metal arc welding (GMAW) requires real-time sensing of the process. Three sensing techniques for GMAW are being developed at the Idaho National Engineering Laboratory (INEL). These are (1) noncontacting ultrasonic sensing using a laser/EMAT (electromagnetic acoustic transducer) to detect defects in the solidified weld on a pass-bypass basis, (2) integrated optical sensing using a CCD camera and a laser stripe to obtain cooling rate and weld bead geometry information, and (3) monitoring fluctuations in digitized welding voltage data to detect the mode of metal droplet transfer and assure that the desired mass input is achieved.

Carlson, N.M.; Johnson, J.A.; Smartt, H.B.; Watkins, A.D.; Larsen, E.D.; Taylor, P.L. [EG and G Idaho, Inc., Idaho Falls, ID (United States); Waddoups, M.A. [Idaho National Engineering Lab., Idaho Falls, ID (United States)

1992-10-01T23:59:59.000Z

14

Sensing the gas metal arc welding process  

SciTech Connect (OSTI)

Control of gas metal arc welding (GMAW) requires real-time sensing of the process. Three sensing techniques for GMAW are being developed at the Idaho National Engineering Laboratory (INEL). These are (1) noncontacting ultrasonic sensing using a laser/EMAT (electromagnetic acoustic transducer) to detect defects in the solidified weld on a pass-bypass basis, (2) integrated optical sensing using a CCD camera and a laser stripe to obtain cooling rate and weld bead geometry information, and (3) monitoring fluctuations in digitized welding voltage data to detect the mode of metal droplet transfer and assure that the desired mass input is achieved.

Carlson, N.M.; Johnson, J.A.; Smartt, H.B.; Watkins, A.D.; Larsen, E.D.; Taylor, P.L. (EG and G Idaho, Inc., Idaho Falls, ID (United States)); Waddoups, M.A. (Idaho National Engineering Lab., Idaho Falls, ID (United States))

1992-01-01T23:59:59.000Z

15

Decomposition of Naphthalene by dc Gliding Arc Gas Discharge  

Science Journals Connector (OSTI)

Decomposition of Naphthalene by dc Gliding Arc Gas Discharge ... In the air and oxygen gliding arc discharges, the naphthalene degradation is mainly governed by reactions with oxygen-derived radicals. ... Therefore, the local electric field strength is relatively low in argon gliding arc plasma. ...

Liang Yu; Xiaodong Li; Xin Tu; Yu Wang; Shengyong Lu; Jianhua Yan

2009-12-11T23:59:59.000Z

16

Oxygen and Nitrogen Contamination During Arc Welding  

E-Print Network [OSTI]

) ) : ,- Oxygen and Nitrogen Contamination During Arc Welding T. W. Eagar Department of }faterials, mechanisms, and expected levels of oxygen and nitrogen contamination during gas tungsten arc, gas metal arc indicating the importance of dec9mposition of SiOz into silicon monoxide and oxygen are presented, indicating

Eagar, Thomas W.

17

JOURNAL DE PPHYSIQUE THEORY OF =LOW CATHODEINATMOSPHERIC ARC INNOBLE GAS  

E-Print Network [OSTI]

. S. S. R. 1. The hollow arc discharge i n cylindrical hollow cathode (IiC) with s l i g h t l yJOURNAL DE PPHYSIQUE THEORY OF =LOW CATHODEINATMOSPHERIC ARC INNOBLE GAS F.G. Baksht, A.B. Rybakov. 4-22742~-j,2x$-.@+.j# .Ya4z(5) 4. he pre-electr*e ionization ~ w e r(L df 9 e L 4 - ~ = d ; ) must

Boyer, Edmond

18

Numerical modeling of the interaction between an electric arc and a gas flow  

Science Journals Connector (OSTI)

The interaction between an equilibrium arc discharge and a gas (air or argon) ... The dynamics and the special features of the electric arc formation are studied for both gases. In the air the electrically conduc...

E. N. Vasil’ev; D. A. Nesterov

2013-03-01T23:59:59.000Z

19

State law equation of a real gas and simulation of electrical arc/gas flow interaction  

Science Journals Connector (OSTI)

Modeling of gas movements in a circuit breaker arc chamber requires an accurate knowledge of thermodynamic functions. The proposed method gives a simplified form of the law of state, in close agreement with the tables. This law has been implemented in the NS2 code developed at Merlin Gerin, France. This code allows detailed investigation of gas flows in circuit breakers.

P Chevrier; J Maftoul

1993-01-01T23:59:59.000Z

20

Tungsten carbide synthesized by low-temperature combustion as gas diffusion electrode catalyst  

E-Print Network [OSTI]

June 2014 Keywords: Low-temperature combustion syn- thesis Tungsten carbide Electrocatalyst Gas burning on the environment, and reduce dependence on fossil fuels, development of pure electric and fuel of highly efficient low-cost electrode catalysts for the oxygen reduction cathode, metaleair batteries have

Volinsky, Alex A.

Note: This page contains sample records for the topic "gas tungsten arc" 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

Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D  

E-Print Network [OSTI]

Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D W. Zhou*, T. Z. Long and C. K ductility, and the HAZ was found to be the `weakest link'. Keywords: Magnesium alloy, AZ91D, TIG welding, Hot cracking, Liquation, Fracture Introduction Magnesium alloys have high strength/weight ratio

Zhou, Wei

22

Optimal Location of Compressed Natural Gas (CNG) Refueling Station Using the Arc Demand Coverage Model  

Science Journals Connector (OSTI)

In this paper a model that locates Compressed Natural Gas (CNG) refueling stations to cover the full volume of vehicle flows is developed and applied. The model inputs consist of a road network include nodes and arcs, the volume of vehicle flows between ... Keywords: Compressed Natural Gas, Arc Demand Coverage Model, Optimal Location, Network

Abtin Boostani; Reza Ghodsi; Ali Kamali Miab

2010-05-01T23:59:59.000Z

23

Influence of gas composition on wafer temperature in a tungsten chemical vapor deposition reactor: Experimental measurements, model  

E-Print Network [OSTI]

Influence of gas composition on wafer temperature in a tungsten chemical vapor deposition reactor-wafer, lamp-heated chemical vapor deposition system were used to study the wafer temperature response to gas composition. A physically based simulation procedure for the process gas and wafer temperature was developed

Rubloff, Gary W.

24

Diameters of Single-Wall Carbon Nanotubes Depending on Helium Gas Pressure in an Arc Discharge  

Science Journals Connector (OSTI)

Diameters of Single-Wall Carbon Nanotubes Depending on Helium Gas Pressure in an Arc Discharge ... So far, relatively large quantities of SWNTs have been produced by using Y?Ni and Fe?Ni catalysts for the electric arc discharge method28-30 and by using a Co?Ni catalyst for the pulsed laser ablation method. ... The electric current of the arc discharge also affected the yield of SWNTs though its effect was not as serious as the helium pressure. ...

Yahachi Saito; Yoshihiko Tani; Atsuo Kasuya

2000-02-26T23:59:59.000Z

25

Calculating the parameters of electric-arc heaters with gas-stabilized arcs  

Science Journals Connector (OSTI)

We used a turbulent model of a longitudinally streamlined electric arc to derive an analytical solution for the ... of the distribution of the primary flow and discharge parameters in a cylindrical discharge chan...

N. A. Zyrichev

1969-07-01T23:59:59.000Z

26

Development of the temperature fields in an electric arc struck on a point electrode in a homogeneous gas stream  

Science Journals Connector (OSTI)

A study is made of the problem of a point electric source in a homogeneous gas stream and operating in the arc discharge regime. The development of an electric arc struck on a point cathode in a ... . The station...

A. B. Vatazhin

27

Exhaust-gas measurements from NASAs HYMETS arc jet.  

SciTech Connect (OSTI)

Arc-jet wind tunnels produce conditions simulating high-altitude hypersonic flight such as occurs upon entry of space craft into planetary atmospheres. They have traditionally been used to study flight in Earth's atmosphere, which consists mostly of nitrogen and oxygen. NASA is presently using arc jets to study entry into Mars' atmosphere, which consists of carbon dioxide and nitrogen. In both cases, a wide variety of chemical reactions take place among the gas constituents and with test articles placed in the flow. In support of those studies, we made measurements using a residual gas analyzer (RGA) that sampled the exhaust stream of a NASA arc jet. The experiments were conducted at the HYMETS arc jet (Hypersonic Materials Environmental Test System) located at the NASA Langley Research Center, Hampton, VA. This report describes our RGA measurements, which are intended to be used for model validation in combination with similar measurements on other systems.

Miller, Paul Albert

2010-11-01T23:59:59.000Z

28

The problem of the burning of an electric arc in a stream of gas  

Science Journals Connector (OSTI)

A one-dimensional heat-conduction equation is analyzed for the positive column of an arc discharge in a lateral gas flow (V?J). Two discharge burning regimes are found for the same parameters (E and V). The cr...

V. L. Goryachev; A. D. Lebedev

1967-10-01T23:59:59.000Z

29

Exhaust Gas Fuel Reforming of Diesel Fuel by Nonthermal Arc Discharge for NOx Trap Regeneration Application  

Science Journals Connector (OSTI)

Exhaust Gas Fuel Reforming of Diesel Fuel by Nonthermal Arc Discharge for NOx Trap Regeneration Application ... It has been demonstrated that low current arc discharges are highly nonhomogenous. ... In the second case, which corresponds to the most favorable one, assuming (i) a 100 kW car engine thermal power (i.e., 40 kW mechanical power), (ii) that the plasma will treat only a small fraction of the exhaust gas (typically 3.5%), (iii) that the plasma will operate under a cycling operating mode, and (iv) an 80% efficiency for the onboard production of electricity from the car engine, one can estimate that the electric power needed to run the plasma will be around 2.2% of the engine power only during 12 s every 11 km (6.8 miles), that is, 12 s every 6 min assuming a 110 km·h?1 (68 mph) average car velocity. ...

Alexandre Lebouvier; Franc?ois Fresnet; Fre?de?ric Fabry; Vale?rie Boch; Vandad Rohani; Franc?ois Cauneau; Laurent Fulcheri

2011-02-03T23:59:59.000Z

30

Gas Phase Electrodeposition: A Programmable Multimaterial Deposition Method for  

E-Print Network [OSTI]

plasma induced synthesis,11 and arc discharge12,13 can produce nanoparticles and nanow- ires of various-phase deposition process produces charged tungsten, and platinum and uses externally electrodeposition, arc discharge, atmospheric pressure gas phase deposition, nanoparticle nanostructured electrodes

Jacobs, Heiko O.

31

Synthesis Gas Production by Combined Reforming of CO2-Containing Natural Gas with Steam and Partial Oxidation in a Multistage Gliding Arc Discharge System  

Science Journals Connector (OSTI)

Synthesis Gas Production by Combined Reforming of CO2-Containing Natural Gas with Steam and Partial Oxidation in a Multistage Gliding Arc Discharge System ... with low-current arcs available in the literature. ... Larkin, D. W.; Caldwell, T. A.; Lobban, L. L.; Mallinson, R. G.Oxygen pathways and carbon dioxide utilization in methane partial oxidation in ambient temperature electric discharges Energy Fuels 1998, 12, 740 ...

Krittiya Pornmai; Narissara Arthiwet; Nongnuch Rueangjitt; Hidetoshi Sekiguchi; Sumaeth Chavadej

2014-07-08T23:59:59.000Z

32

Mechanical Characteristics of Submerged Arc Weldment in API Gas Pipeline Steel of Grade X65  

SciTech Connect (OSTI)

The mechanical properties of submerged arc weldment (SAW) in gas transportation pipeline steel of grade API X65 (65 ksi yield strength) were investigated. This steel is produced by thermo mechanical control rolled (TMC), and is largely used in Iran gas piping systems and networks. The results from laboratory study on three different regions; i.e. base metal (BM), fusion zone (FZ) and heat affected zone (HAZ) were used to compare weldment mechanical characteristics with those specified by API 5L (revision 2004) standard code. Different laboratory experiments were conducted on test specimens taken from 48 inch outside diameter and 14.3 mm wall thickness gas pipeline. The test results showed a gradient of microstructure and Vickers hardness data from the centerline of FZ towards the unaffected MB. Similarly, lower Charpy absorbed energy (compared to BM) was observed in the FZ impact specimens. Despite this, the API specifications were fulfilled in three tested zones, ensuring pipeline structural integrity under working conditions.

Hashemi, S. H. [Department of Mechanical Engineering, University of Birjand, POBOX 97175-376, Birjand (Iran, Islamic Republic of); Mohammadyani, D. [Materials and Energy Research Center (MERC) POBOX 14155-4777, Tehran (Iran, Islamic Republic of)

2011-01-17T23:59:59.000Z

33

Exhaust gas fuel reforming of Diesel fuel by non-thermal arc discharge for NOx trap regeneration  

E-Print Network [OSTI]

1 Exhaust gas fuel reforming of Diesel fuel by non- thermal arc discharge for NOx trap regeneration to the reforming of Diesel fuel with Diesel engine exhaust gas using a non-thermal plasma torch for NOx trap Diesel fuel reforming with hal-00617141,version1-17May2013 Author manuscript, published in "Energy

Boyer, Edmond

34

Crystalline mesoporous tungsten oxide nanoplate monoliths synthesized by directed soft template method for highly sensitive NO{sub 2} gas sensor applications  

SciTech Connect (OSTI)

Graphical abstract: Display Omitted Highlights: ? Mesoporous WO{sub 3} nanoplate monoliths were obtained by direct templating synthesis. ? Enable effective accession of the analytic molecules for the sensor applications. ? The WO{sub 3} sensor exhibited a high performance to NO{sub 2} gas at low temperature. -- Abstract: Controllable synthesis of nanostructured metal oxide semiconductors with nanocrystalline size, porous structure, and large specific surface area is one of the key issues for effective gas sensor applications. In this study, crystalline mesoporous tungsten oxide nanoplate-like monoliths with high specific surface areas were obtained through instant direct-templating synthesis for highly sensitive nitrogen dioxide (NO{sub 2}) sensor applications. The copolymer soft template was converted into a solid carbon framework by heat treatment in an inert gas prior to calcinations in air to sustain the mesoporous structure of tungsten oxide. The multidirectional mesoporous structures of tungsten oxide with small crystalline size, large specific surface area, and superior physical characteristics enabled the rapid and effective accession of analytic gas molecules. As a result, the sensor response was enhanced and the response and recovery times were reduced, in which the mesoporous tungsten oxide based gas sensor exhibited a superior response of 21,155% to 5 ppm NO{sub 2}. In addition, the developed sensor exhibited selective detection of low NO{sub 2} concentration in ammonia and ethanol at a low temperature of approximately 150 °C.

Hoa, Nguyen Duc, E-mail: ndhoa@itims.edu.vn [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam); Duy, Nguyen Van [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam)] [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam); Hieu, Nguyen Van, E-mail: hieu@itims.edu.vn [International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) (Viet Nam)

2013-02-15T23:59:59.000Z

35

Experimental study of heat transfer in an electric arc gas heater with vortex stabilization of the discharge  

Science Journals Connector (OSTI)

The results of an experimental investigation into heat transfer in the discharge chamber of an electric-arc gas heater are presented. For the anode...an=f(I, d), St=f(l/d, Re, N/GH0). The energy losses in the bas...

V. L. Sergeev

1971-01-01T23:59:59.000Z

36

Optimization of Weld Bead Penetration in Pulsed Gas Metal Arc Welding using Genetic Algorithm  

E-Print Network [OSTI]

Abstract — The weld quality is highly influenced by various process parameters involved in the process. This can be achieved by meeting quality requirements of bead geometry. Inadequate depth of penetration will contribute to failure of the welded structure. This paper presents the development of genetic algorithm model for the optimization of depth of penetration of weld bead geometry in pulsed gas metal arc welding process. The model is based on experimental data. The thickness of the plate, pulse frequency, wire feed rate, wire feed rate/travel speed ratio, and peak current have been considered as the process parameters to maximize the bead penetration depth. Optimization of process parameters was done using GA. The developed model is then compared with experimental results and it is found that the results obtained from genetic algorithm model are accurate. The optimal process parameters gave a value of 5.314 for depth of penetration which demonstrates an accuracy of 1.33 % and thus the effectiveness of the model presented. The obtained results help in selecting quickly the process parameters to achieve the desired quality. Keywords—Genetic algorithm, Pulsed GMA welding, Welding parameters, Depth of penetration, Regression mode I.

K. Manikya Kanti; P. Srinivasa Rao; G. Ranga Janardhana

37

Using ArcGIS to extrapolate greenhouse gas emissions on the Pengxi River, a tributary of the Three Gorges Reservoir in China  

E-Print Network [OSTI]

Using ArcGIS to extrapolate greenhouse gas emissions on the Pengxi River, a tributary of the Three Gorges Reservoir in China Lindsey MW Yasarer, PhD Candidate, University of Kansas Dr. Zhe Li, Associate Professor, Chongqing University Dr.... Belinda Sturm, Associate Professor, University of Kansas RESERVOIR GREENHOUSE GAS EMISSIONS (Image from FURNAS www.dsr.inpe.br) HOW TO SCALE UP GHG EMISSIONS? PROJECT OBJECTIVE: Estimate overall greenhouse gas emissions from the Pengxi River Backwater...

Yasarer, Lindsey

2014-11-19T23:59:59.000Z

38

Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique  

SciTech Connect (OSTI)

A two-wavelength quantitative Schlieren technique that allows inferring the electron and gas densities of axisymmetric arc plasmas without imposing any assumption regarding statistical equilibrium models is reported. This technique was applied to the study of local thermodynamic equilibrium (LTE) departures within the core of a 30 A high-energy density cutting arc. In order to derive the electron and heavy particle temperatures from the inferred density profiles, a generalized two-temperature Saha equation together with the plasma equation of state and the quasineutrality condition were employed. Factors such as arc fluctuations that influence the accuracy of the measurements and the validity of the assumptions used to derive the plasma species temperature were considered. Significant deviations from chemical equilibrium as well as kinetic equilibrium were found at elevated electron temperatures and gas densities toward the arc core edge. An electron temperature profile nearly constant through the arc core with a value of about 14000-15000 K, well decoupled from the heavy particle temperature of about 1500 K at the arc core edge, was inferred.

Prevosto, L.; Mancinelli, B. [Grupo de Descargas Electricas, Departamento Ing. Electromecanica, Facultad Regional Venado Tuerto (UTN), Laprida 651, Venado Tuerto 2600, Santa Fe (Argentina); Artana, G. [Laboratorio de Fluidodinamica, Departamento Ing. Mecanica, Facultad de Ingenieria (UBA), Paseo Colon 850, C1063ACV, Buenos Aires (Argentina); Kelly, H. [Grupo de Descargas Electricas, Departamento Ing. Electromecanica, Facultad Regional Venado Tuerto (UTN), Laprida 651, Venado Tuerto 2600, Santa Fe (Argentina); Departamento de Fisica, Facultad de Ciencias Exactas y Naturales (UBA), Instituto de Fisica del Plasma (CONICET), Ciudad Universitaria, Pab. I, 1428 Buenos Aires (Argentina)

2011-03-15T23:59:59.000Z

39

Roughening and removal of surface contamination from beryllium using negative transferred-arc cleaning  

SciTech Connect (OSTI)

Negative transferred-arc (TA) cleaning has been used extensively in the aerospace industry to clean and prepare surfaces prior to plasma spraying of thermal barrier coatings. This non-line of sight process can improve the bond strength of plasma sprayed coatings to the substrate material by cleaning and macroscopically roughening the surface. A variation of this cleaning methodology is also used in gas tungsten arc (GTA) welding to cathodically clean the surfaces of aluminum and magnesium prior to welding. Investigations are currently being performed to quantify the degree in which the negative transferred-arc process can clean and roughen metal surfaces. Preliminary information will be reported on the influence of processing conditions on roughening and the removal of carbon and other contaminates from the surface of beryllium. Optical, spectral and electrical methods to quantify cleaning of the surface will also be discussed. Applications for this technology include chemical-free precision cleaning of beryllium components.

Castro, R.G.; Hollis, K.J.; Elliott, K.E. [Los Alamos National Lab., NM (United States). Materials Science and Technology Div.

1997-12-01T23:59:59.000Z

40

KISMET tungsten dispersal experiment  

SciTech Connect (OSTI)

Results of the KISMET tungsten dispersal experiment indicate a relatively small degree of wall-rock contamination caused by this underground explosive experiment. Designed as an add-on to the KISMET test, which was performed in the U-1a.02 drift of the LYNER facility at Nevada Test Site on 1 March 1995, this experiment involved recovery and analysis of wall-rock samples affected by the high- explosive test. The chemical, high-explosive blast drove tungsten powder, placed around the test package as a plutonium analog, into the surrounding wall- rock alluvium. Sample analyses by an analytical digital electron microscope (ADEM) show tungsten dispersed in the rock as tiny (<10 {mu}m) particles, agglomerates, and coatings on alluvial clasts. Tungsten concentrations, measured by energy dispersive spectral analysis on the ADEM, indicate penetration depths less than 0.1 m and maximum concentrations of 1.5 wt % in the alluvium.

Wohletz, K.; Kunkle, T.; Hawkins, W.

1996-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Anode and Cathode Arcs  

Science Journals Connector (OSTI)

... we call an anode arc, produces a circular pit on the anode and a general roughening of the opposed cathode. Photomicrographs of single anode-type arcs were published1 before the ... arcs\tCathode arcs

L. H. GERMER; W. S. BOYLE

1955-11-26T23:59:59.000Z

42

Narrow groove welding gas diffuser assembly and welding torch  

DOE Patents [OSTI]

A diffuser assembly is provided for narrow groove welding using an automatic gas tungsten arc welding torch. The diffuser assembly includes a manifold adapted for adjustable mounting on the welding torch which is received in a central opening in the manifold. Laterally extending manifold sections communicate with a shield gas inlet such that shield gas supplied to the inlet passes to gas passages of the manifold sections. First and second tapered diffusers are respectively connected to the manifold sections in fluid communication with the gas passages thereof. The diffusers extend downwardly along the torch electrode on opposite sides thereof so as to release shield gas along the length of the electrode and at the distal tip of the electrode. The diffusers are of a transverse width which is on the order of the thickness of the electrode so that the diffusers can, in use, be inserted into a narrow welding groove before and after the electrode in the direction of the weld operation.

Rooney, Stephen J. (East Berne, NY)

2001-01-01T23:59:59.000Z

43

Tungsten Cathode Catalyst for PEMFC  

SciTech Connect (OSTI)

Final report for project to evaluate tungsten-based catalyst as a cathode catalyst for PEM cell applications.

Joel B. Christian; Sean P. E. Smith

2006-09-22T23:59:59.000Z

44

Metals purification by improved vacuum arc remelting  

DOE Patents [OSTI]

The invention relates to improved apparatuses and methods for remelting metal alloys in furnaces, particularly consumable electrode vacuum arc furnaces. Excited reactive gas is injected into a stationary furnace arc zone, thus accelerating the reduction reactions which purify the metal being melted. Additionally, a cooled condensation surface is disposed within the furnace to reduce the partial pressure of water in the furnace, which also fosters the reduction reactions which result in a purer produced ingot. Methods and means are provided for maintaining the stationary arc zone, thereby reducing the opportunity for contaminants evaporated from the arc zone to be reintroduced into the produced ingot.

Zanner, Frank J. (Sandia Park, NM); Williamson, Rodney L. (Albuquerque, NM); Smith, Mark F. (Albuquerque, NM)

1994-12-13T23:59:59.000Z

45

Rare Earth Tungsten Bronzes  

Science Journals Connector (OSTI)

Rare Earth Tungsten Bronzes ... Trivalent Rare Earth Ion Conduction in the Rare Earth Tungstates with the Sc2(WO4)3-Type Structure ... Trivalent Rare Earth Ion Conduction in the Rare Earth Tungstates with the Sc2(WO4)3-Type Structure ...

Werner Ostertag

1966-05-01T23:59:59.000Z

46

Low voltage arc formation in railguns  

DOE Patents [OSTI]

A low voltage plasma arc is first established across the rails behind the projectile by switching a low voltage high current source across the rails to establish a plasma arc by vaporizing a fuse mounted on the back of the projectile, maintaining the voltage across the rails below the railgun breakdown voltage to prevent arc formation ahead of the projectile. After the plasma arc has been formed behind the projectile a discriminator switches the full energy bank across the rails to accelerate the projectile. A gas gun injector may be utilized to inject a projectile into the breech of a railgun. The invention permits the use of a gas gun or gun powder injector and an evacuated barrel without the risk of spurious arc formation in front of the projectile.

Hawke, R.S.

1985-08-05T23:59:59.000Z

47

Low voltage arc formation in railguns  

DOE Patents [OSTI]

A low voltage plasma arc is first established across the rails behind the projectile by switching a low voltage high current source across the rails to establish a plasma arc by vaporizing a fuse mounted on the back of the projectile, maintaining the voltage across the rails below the railgun breakdown voltage to prevent arc formation ahead of the projectile. After the plasma arc has been formed behind the projectile a discriminator switches the full energy bank across the rails to accelerate the projectile. A gas gun injector may be utilized to inject a projectile into the breech of a railgun. The invention permits the use of a gas gun or gun powder injector and an evacuated barrel without the risk of spurious arc formation in front of the projectile. 2 figs.

Hawke, R.S.

1987-11-17T23:59:59.000Z

48

Low voltage arc formation in railguns  

DOE Patents [OSTI]

A low voltage plasma arc is first established across the rails behind the projectile by switching a low voltage high current source across the rails to establish a plasma arc by vaporizing a fuse mounted on the back of the projectile, maintaining the voltage across the rails below the railgun breakdown voltage to prevent arc formation ahead of the projectile. After the plasma arc has been formed behind the projectile a discriminator switches the full energy bank across the rails to accelerate the projectile. A gas gun injector may be utilized to inject a projectile into the breech of a railgun. The invention permits the use of a gas gun or gun powder injector and an evacuated barrel without the risk of spurious arc formation in front of the projectile.

Hawke, Ronald S. (Livermore, CA)

1987-01-01T23:59:59.000Z

49

PROCEDURES FOR ARC PROJECTS  

E-Print Network [OSTI]

PROCEDURES FOR ARC PROJECTS Revised - May 2013 Agricultural Research Center Washington State University #12;Table of Contents THE PROJECT SYSTEM, AN INTRODUCTION................................................................................. 5 DEVELOPING AN ARC PROJECT

Collins, Gary S.

50

(Data in metric tons of tungsten content unless otherwise noted) Domestic Production and Use: A mine in California restarted operations and made its first shipment of tungsten  

E-Print Network [OSTI]

in the metalworking, mining, oil- and gas-drilling, and construction industries. The remaining tungsten was consumed inventory inventory for disposal FY 2007 FY 2007 Ferrotungsten 6 136 Metal powder 268 268 136 34 Ores

51

JOURNAL DE PHYSIQUE CoZZoque C7, suppZ&nent au n07, Tome 40, Juillet 1979, page C7-451 AN INVESTIGATIONOF ARC STARTING ON COLDCATHODES  

E-Print Network [OSTI]

-voltage arc spot mode, with brief(40 micro-sec) re-ignition and de-ignition spikes near current zero electrodes. This arc spot can move about a tungsten surface w i t h scattered oxide surface layers AN INVESTIGATIONOF ARC STARTING ON COLDCATHODES Harald L.Witting. Genera2 Electric Company, Corporate Research

Paris-Sud XI, Université de

52

Unipolar arc simulation device  

SciTech Connect (OSTI)

We describe a simple laboratory device for establishing a vacuum arc plasma discharge that can serve to simulate a unipolar arc. The technique makes use of a triggered vacuum arc plasma gun to generate a plasma plume that in turn causes breakdown of a secondary discharge. The device is in fact a secondary vacuum arc discharge that is triggered by a primary vacuum arc discharge, with some of the features of the secondary plasma discharge having similarities with a unipolar arc configuration. Here we describe the experimental setup and outline how the device can be used for some areas of unipolar arc materials research. [copyright] [ital 1999 American Institute of Physics.

Wang, S.G.; Brown, I.G. (Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States))

1999-09-01T23:59:59.000Z

53

The effective spectral irradiance of ultra-violet radiations from inert-gas-shielded welding processes in relation to the ARC current density  

E-Print Network [OSTI]

lamp filaments, the electrodes of an electric arc, and molten metals of high melting point. The emission of an incandescent object is due to its temperature and depends little upon the chemical nature of the radiator. The Stefan- 13 Boltzmann law... is automatically fed by the welding machine into the weld puddle. Metal is transferred through the arc plasma to the base material being welded. The wire is of the same metallic composition as the base metal, and generally the same diameter is used for most...

DeVore, Robin Kent

1973-01-01T23:59:59.000Z

54

Experimental and theoretical study of exhaust gas fuel reforming of Diesel fuel by a non-thermal arc discharge for syngas production  

E-Print Network [OSTI]

-thermal arc discharge for syngas production A. Lebouvier1,2 , F. Fresnet2 , F. Fabry1 , V. Boch2 , V. Rohani1% and a conversion rate of 95% have been reached which correspond to a syngas dry molar fraction of 25%. For the most to POx reaction. To higher the temperature, more oxygen is needed but local combustion can happen

Paris-Sud XI, Université de

55

Dynamic voltage-current characteristics for a water jet plasma arc  

SciTech Connect (OSTI)

A virtual instrument technology is used to measure arc current, arc voltage, dynamic V-I characteristics, and nonlinear conductance for a cone-shaped water jet plasma arc under ac voltage. Experimental results show that ac arc discharge mainly happens in water vapor evaporated from water when heated. However, due to water's cooling effect and its conductance, arc conductance, reignition voltage, extinguish voltage, and current zero time are very different from those for ac arc discharge in gas work fluid. These can be valuable to further studies on mechanism and characteristics of plasma ac discharge in water, and even in gas work fluid.

Yang Jiaxiang; Lan Sheng; Xu Zuoming [College of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang 150040 (China)

2008-05-05T23:59:59.000Z

56

Process Of Bonding Copper And Tungsten  

DOE Patents [OSTI]

Process for bonding a copper substrate to a tungsten substrate by providing a thin metallic adhesion promoting film bonded to a tungsten substrate and a functionally graded material (FGM) interlayer bonding the thin metallic adhesion promoting film to the copper substrate. The FGM interlayer is formed by sintering a stack of individual copper and tungsten powder blend layers having progressively higher copper content/tungsten content, by volume, ratio values in successive powder blend layers in a lineal direction extending from the tungsten substrate towards the copper substrate. The resulting copper to tungsten joint well accommodates the difference in the coefficient of thermal expansion of the materials.

Slattery, Kevin T. (St. Charles, MO); Driemeyer, Daniel E. (Manchester, MO); Davis, John W. (Ballwin, MO)

2000-07-18T23:59:59.000Z

57

Modeling of thermal plasma arc technology FY 1994 report  

SciTech Connect (OSTI)

The thermal plasma arc process is under consideration to thermally treat hazardous and radioactive waste. A computer model for the thermal plasma arc technology was designed as a tool to aid in the development and use of the plasma arc-Joule beating process. The value of this computer model is to: (a) aid in understanding the plasma arc-Joule beating process as applied to buried waste or exhumed buried waste, (b) help design melter geometry and electrode configuration, (c) calculate the process capability of vitrifying waste (i.e., tons/hour), (d) develop efficient plasma and melter operating conditions to optimize the process and/or reduce safety hazards, (e) calculate chemical reactions during treatment of waste to track chemical composition of off-gas products, and composition of final vitrified waste form and (f) help compare the designs of different plasma-arc facilities. A steady-state model of a two-dimensional axisymmetric transferred plasma arc has been developed and validated. A parametric analysis was performed that studied the effects of arc length, plasma gas composition, and input power on the temperatures and velocity profiles of the slag and plasma gas. A two-dimensional transient thermo-fluid model of the US Bureau of Mines plasma arc melter has been developed. This model includes the growth of a slag pool. The thermo-fluid model is used to predict the temperature and pressure fields within a plasma arc furnace. An analysis was performed to determine the effects of a molten metal pool on the temperature, velocity, and voltage fields within the slag. A robust and accurate model for the chemical equilibrium calculations has been selected to determine chemical composition of final waste form and off-gas based on the temperatures and pressures within the plasma-arc furnace. A chemical database has been selected. The database is based on the materials to be processed in the plasma arc furnaces.

Hawkes, G.L.; Nguyen, H.D.; Paik, S.; McKellar, M.G.

1995-03-01T23:59:59.000Z

58

Taupo's atypical arc  

Science Journals Connector (OSTI)

... many other continental arcs around the world, with andesite-dacite cone volcaaoes and relatively low geothermal heat fluxes. In sharp contrast, in the middle

Colin J. N. Wilson

1996-01-04T23:59:59.000Z

59

Cathodic Arc Plasma Deposition  

Office of Scientific and Technical Information (OSTI)

Cathodic Arc Plasma Deposition Cathodic Arc Plasma Deposition André Anders Lawrence Berkeley National Laboratory, University of California, 1 Cyclotron Road, Mailstop 53, Berkeley, California 94720 aanders@lbl.gov Abstract Cathodic arc plasma deposition is one of oldest coatings technologies. Over the last two decades it has become the technology of choice for hard, wear resistant coatings on cutting and forming tools, corrosion resistant and decorative coatings on door knobs, shower heads, jewelry, and many other substrates. The history, basic physics of cathodic arc operation, the infamous macroparticle problem and common filter solutions are reviewed. Cathodic arc plasmas stand out due to their high degree of ionization, with important consequences for film nucleation, growth, and efficient utilization of substrate bias. The

60

Process Of Bonding Copper And Tungsten  

DOE Patents [OSTI]

Process for bonding a copper substrate to a tungsten substrate by providing a thin metallic adhesion promoting film bonded to a tungsten substrate and a functionally graded material (FGM) interlayer bonding the thin metallic adhesion promoting film to the copper substrate. The FGM interlayer is formed by thermal plasma spraying mixtures of copper powder and tungsten powder in a varied blending ratio such that the blending ratio of the copper powder and the tungsten powder that is fed to a plasma torch is intermittently adjusted to provide progressively higher copper content/tungsten content, by volume, ratio values in the interlayer in a lineal direction extending from the tungsten substrate towards the copper substrate. The resulting copper to tungsten joint well accommodates the difference in the coefficient of thermal expansion of the materials.

Slattery, Kevin T. (St. Charles, MO); Driemeyer, Daniel E. (Manchester, MO)

1999-11-23T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Int. J. Modelling, Identification and Control, Vol. 1, No. 2, 2006 133 Copyright 2006 Inderscience Enterprises Ltd.  

E-Print Network [OSTI]

: An adaptive control based on fuzzy logic has been implemented for Gas Tungsten Arc Welding (GTAW logic control and adaptive fuzzy logic control of gas tungsten arc welding. Keywords: Gas Tungsten Arc Welding (GTAW) adaptive control; fuzzy logic. Reference to this paper should be made as follows: Crawford

Zhang, YuMing

62

Electric arc saw apparatus  

DOE Patents [OSTI]

A portable, hand held electric arc saw has a small frame for supporting an electrically conducting rotary blade which serves as an electrode for generating an electric arc to erode a workpiece. Electric current is supplied to the blade by biased brushes and a slip ring which are mounted in the frame. A pair of freely movable endless belts in the form of crawler treads stretched between two pulleys are used to facilitate movement of the electric arc saw. The pulleys are formed of dielectric material to electrically insulate the crawler treads from the frame.

Deichelbohrer, Paul R [Richland, WA

1986-01-01T23:59:59.000Z

63

Synthesis of tungsten nano composites  

SciTech Connect (OSTI)

Tungsten-copper composites are currently used as thermal management substrates on a commercial basis. Properties such as high corrosion/erosion resistance, good thermal and electrical conductivity and sufficient mechanical strength and thermal shock resistance make tungsten-copper based composites attractive as electrode materials in automobile sparkplugs. These composites are mostly manufactured through infiltration and mechanical alloying. The products, however, generally lack compositional homogeneity. In this study, chemical approaches were used to synthesize W-Cu and W-Cu-TiB{sub 2} composites. The powders obtained had an average agglomerate size of 1.2 {mu}m and consisted of 50--200 mn sized primary particles. The W and Cu distribution was uniform on at least the submicron level. Consolidation studies on a W-Cu-TiB{sub 2} sample showed no substantial grain growth at 1,350 C under 500 MPa pressure for 2 minutes. The morphology of the grains, however, underwent noticeable changes.

Yu, C.C.; Kumar, R.; Sudarshan, T.S. [Materials Modification, Inc., Fairfax, VA (United States)

1996-06-01T23:59:59.000Z

64

Cold-hollow-cathode arc discharge in crossed electric and magnetic fields  

Science Journals Connector (OSTI)

A crossed-field cold-hollow-cathode arc is stable at low working gas pressures...?2–10?1 Pa, magnetic-field-and gas-dependent arcing voltages of 20–50 V, and discharge currents of 20–200 A. This is ... produced o...

P. M. Schanin; N. N. Koval; Yu. Kh. Akhmadeev; S. V. Grigoriev

2004-05-01T23:59:59.000Z

65

Vacuum arc deposition devices  

SciTech Connect (OSTI)

The vacuum arc is a high-current, low-voltage electrical discharge which produces a plasma consisting of vaporized and ionized electrode material. In the most common cathodic arc deposition systems, the arc concentrates at minute cathode spots on the cathode surface and the plasma is emitted as a hypersonic jet, with some degree of contamination by molten droplets [known as macroparticles (MPs)] of the cathode material. In vacuum arc deposition systems, the location and motion of the cathode spots are confined to desired surfaces by an applied magnetic field and shields around undesired surfaces. Substrates are mounted on a holder so that they intercept some portion of the plasma jet. The substrate often provides for negative bias to control the energy of depositing ions and heating or cooling to control the substrate temperature. In some systems, a magnetic field is used to guide the plasma around an obstacle which blocks the MPs. These elements are integrated with a deposition chamber, cooling, vacuum gauges and pumps, and power supplies to produce a vacuum arc deposition system.

Boxman, R.L.; Zhitomirsky, V.N. [Electrical Discharge and Plasma Laboratory, Faculty of Engineering, Tel Aviv University, P.O. Box 39040, Tel Aviv 69978 (Israel)

2006-02-15T23:59:59.000Z

66

Numerical simulation of carbon arc discharge for nanoparticle synthesis  

SciTech Connect (OSTI)

Arc discharge with catalyst-filled carbon anode in helium background was used for the synthesis of carbon nanoparticles. In this paper, we present the results of numerical simulation of carbon arc discharges with arc current varying from 10 A to 100 A in a background gas pressure of 68 kPa. Anode sublimation rate and current voltage characteristics are compared with experiments. Distribution of temperature and species density, which is important for the estimation of the growth of nanoparticles, is obtained. The probable location of nanoparticle growth region is identified based on the temperature range for the formation of catalyst clusters.

Kundrapu, M.; Keidar, M. [Department of Mechanical and Aerospace Engineering, George Washington University, Washington, DC 20052 (United States)

2012-07-15T23:59:59.000Z

67

K Series Spectrum of Tungsten  

Science Journals Connector (OSTI)

...The source of x-rays is a General Electric Pyrex tube operated at a constant potential...and the tube adjusted until the counter discharge rate was a maximum. The crystal used...served to oscillate the crystal through an arc of five minutes. Thus both a lines are...

J. C. Hudson; H. G. Vogt

1933-01-01T23:59:59.000Z

68

College of Design ARC Architecture  

E-Print Network [OSTI]

College of Design ARC Architecture KEY: # = new course * = course changed = course dropped,landscape,andarchitecturalspaceswithattentiontotheirapplicationtothearchitecturalexperience.Studio:4hoursperweek. Prereq: Admission to the School of Architecture. ARC 102 DRAWING II: OBSERVATIONAL OF ARCHITECTURE. (3

MacAdam, Keith

69

Electrochromically switched, gas-reservoir metal hydride devices with application to energy-efficient windows  

E-Print Network [OSTI]

gas-reservoir MnNiMg electrochromic mirror devices have beencontrast to conventional electrochromic approaches, hydrogenThe application of electrochromic devices based on tungsten

Anders, Andre

2008-01-01T23:59:59.000Z

70

Hall-effect arc protector  

DOE Patents [OSTI]

The Hall-Effect Arc Protector is used to protect sensitive electronics from high energy arcs. The apparatus detects arcs by monitoring an electrical conductor, of the instrument, for changes in the electromagnetic field surrounding the conductor which would be indicative of a possible arcing condition. When the magnitude of the monitored electromagnetic field exceeds a predetermined threshold, the potential for an instrument damaging are exists and the control system logic activates a high speed circuit breaker. The activation of the breaker shunts the energy imparted to the input signal through a dummy load to the ground. After the arc condition is terminated, the normal signal path is restored.

Rankin, Richard A. (Ammon, ID); Kotter, Dale K. (Shelley, ID)

1997-01-01T23:59:59.000Z

71

Hall-effect arc protector  

DOE Patents [OSTI]

The Hall-Effect Arc Protector is used to protect sensitive electronics from high energy arcs. The apparatus detects arcs by monitoring an electrical conductor, of the instrument, for changes in the electromagnetic field surrounding the conductor which would be indicative of a possible arcing condition. When the magnitude of the monitored electromagnetic field exceeds a predetermined threshold, the potential for an instrument damaging are exists and the control system logic activates a high speed circuit breaker. The activation of the breaker shunts the energy imparted to the input signal through a dummy load to the ground. After the arc condition is terminated, the normal signal path is restored. 2 figs.

Rankin, R.A.; Kotter, D.K.

1997-05-13T23:59:59.000Z

72

Electrical conductivity of warm dense tungsten  

Science Journals Connector (OSTI)

Abstract The electrical conductivity of warm dense tungsten plasma has been investigated successfully by a linear mixture rule considering various interactions of electrons with electrons, atoms, and ions. The plasma composition is calculated by the nonideal Saha equation. The interesting regime for tungsten plasma spans from weakly coupled and nondegenerate regime to strongly coupled and partial degenerate state. The electrical conductivity calculated is in reasonable agreement with the exploding wire experiments and other theoretical models. The present result demonstrates that the theoretical model is valid for the electrical conductivity of tungsten plasma in the warm dense matter regime.

Zhijian Fu; Lijun Jia; Xiaowei Sun; Qifeng Chen

2013-01-01T23:59:59.000Z

73

Tungsten wire for incandescent lamps  

SciTech Connect (OSTI)

Tungsten wire for incandescent lamp filaments must operate at high temperatures and for long times. To meet these requirements, the grain morphology of the wire must be controlled to reduce the propensity for grain boundary sliding. The morphology is a function of the distribution of very small pockets of potassium in the wire and the mechanical processing from ingot to wire. The behavior of the filament is directly related to the grain morphology. This paper describes the mechanism by which the potassium is incorporated into and distributed in the ingot. The elongation and spheroidization of the bubbles during hot rolling and swaging is also examined and related to the grain morphology of wire. Some indications of the relationship between grain morphology and filament behavior are also given.

Walter, J.L.; Briant, C.L. (General Electric Corporate Research and Development, Schenectady, NY (USA))

1990-09-01T23:59:59.000Z

74

Stability analysis of multi-phase AC arc discharge for in-flight glass melting  

Science Journals Connector (OSTI)

A stable multi-phase AC arc was generated to by transformers at a commercial electric system. The arc discharge behavior and the stability were investigated by the high-speed video camera observation synchronized with the voltage waveform analysis. The effect of the number of phase and the flaming gas addition into the arc region on the arc behavior and the arc stability were studied. Results showed that the re-ignition occurred between adjacent electrodes periodically. Two kinds of the stability analysis methods were introduced. The estimated fluctuation degree showed that an increase of the number of the phase leads to the stable multi-phase AC arc. The deviation of the arc voltage from the average arc voltage was estimated to evaluate the uniformity of the multi-phase AC arc. Although an addition of the oxygen flame into the arc region leads to lower uniformity, the modification of the electrode position can improve the uniformity of the multi-phase AC arc.

Manabu Tanaka; Yosuke Tsuruoka; Yaping Liu; Tsugio Matsuura; Takayuki Watanabe

2011-01-01T23:59:59.000Z

75

Preparation, Characterization, and Catalytic Properties of Tungsten...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Abstract: The structure and catalytic activity of tungsten oxide clusters formed via sublimation of monodispersed cyclic (WO3)3 onto FeO(111)Pt(111) surface has been studied...

76

Dynamic behaviour of electric arc gas discharge  

Science Journals Connector (OSTI)

The time-dependent energy and circuit equations are solved numerically to obtain temperature profiles, current-voltage characteristics and electric field strength vs axial temperature diagrams in the asymptoti...

J. Jeništa

1994-01-01T23:59:59.000Z

77

GIS Fundamentals: Supplementary Lessons with ArcGIS Introduction to ArcGIS Lesson 1: Introduction to ArcGIS  

E-Print Network [OSTI]

GIS Fundamentals: Supplementary Lessons with ArcGIS Introduction to ArcGIS 1 Lesson 1: Introduction to ArcGIS What You'll Learn: -Start ArcMap -Create a new map -Add data layers -Pan and zoom -Change data errors. Background: This is the first in a series of introductory exercises for ArcGIS

Harbor, David

78

Effect of a floating electrode on an atmospheric-pressure non-thermal arc discharge  

Science Journals Connector (OSTI)

Characteristics of the atmospheric non-thermal ac arc air plasmas produced by a plasma generator with a floating electrode are investigated. The measurements show that with the help of the surface dielectric barrier discharges between the main electrodes and the floating electrode the ignition voltage of the non-thermal arc discharges can be reduced significantly and an arc discharge mode can be stabilized at high gas flow rates. The measuredtemperatures of the non-thermal arcs are at the level of 2000–3000 K under different operating conditions.

Zhi-Bin Wang; Guo-Xu Chen; Zhe Wang; Nan Ge; He-Ping Li; Cheng-Yu Bao

2011-01-01T23:59:59.000Z

79

Thermal motion of carbon clusters and production of carbon nanotubes by gravity-free arc discharge  

SciTech Connect (OSTI)

Thermal and diffusion properties of hot gas around a dc arc discharge under a gravity-free condition are investigated using a jet plane in order to improve the arc production of carbon clusters. Spherically symmetric temperature distribution of He gas around the arc plasma and monotonic slow expansion of the high-temperature region are observed. By means of the passive-type Mie scattering method, random slow diffusion of carbon clusters around the arc plasma is clearly observed under the gravity-free condition. This indicates that carbon clusters including single-walled carbon nanotubes are synthesized around the arc plasma where the He temperature is higher than 1000 K. It is confirmed that large bundles of fatter single-walled carbon nanotubes are produced under the gravity-free condition.

Mieno, T.; Takeguchi, M. [Department of Physics, Shizuoka University, Ooya, Suruga-ku, Shizuoka 422-8529 (Japan); National Institute for Material Science, Sakura, Tsukuba 305-0003 (Japan)

2006-05-15T23:59:59.000Z

80

High-temperature stress measurement on chemical-vapor-deposited tungsten silicide and tungsten films  

SciTech Connect (OSTI)

Stresses in chemical-vapor-deposited tungsten silicide and tungsten films at high temperatures were measured. Tungsten silicide films were formed from WF/sub 6/ and SiH/sub 4/ or Si/sub 2/H/sub 6/. Tungsten films were formed from WF/sub 6/ and H/sub 2/. The stress in tungsten silicide films is tensile and in the order of 10/sup 9/--10/sup 10/ dynes/cm/sup 2/. For a composition ratio of Si/Wless than or equal to2.6, the stress of a film of more than 1000 A has a maximum at about 500 /sup 0/C. On the other hand, for a composition Si/W>2.9, the stress has no maximum. The maximum of the stress is caused by crystallization of the film. The stress has two components. One component is related to the difference of the thermal expansion coefficients between the film and the Si substrate. Another is related to the film crystallization. It was found that the stress concentrates in the portion of the film nearest the substrate. The stress in tungsten films also reaches a maximum at 550 /sup 0/C, similar to the tungsten silicide films. However, the cause of this behavior is not clear.

Shioya, Y.; Ikegami, K.; Maeda, M.; Yanagida, K.

1987-01-15T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Tungsten Mountain Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

Tungsten Mountain Geothermal Area Tungsten Mountain Geothermal Area Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Resource Area: Tungsten Mountain Geothermal Area Contents 1 Area Overview 2 History and Infrastructure 3 Regulatory and Environmental Issues 4 Exploration History 5 Well Field Description 6 Geology of the Area 7 Geofluid Geochemistry 8 NEPA-Related Analyses (4) 9 Exploration Activities (4) 10 References Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"300px","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":39.6751,"lon":-117.6945,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

82

Element 74, the Wolfram Versus Tungsten Controversy  

SciTech Connect (OSTI)

Two and a quarter centuries ago, a heavy mineral ore was found which was thought to contain a new chemical element called heavy stone (or tungsten in Swedish). A few years later, the metal was separated from its oxide and the new element (Z=74) was called wolfram. Over the years since that time, both the names wolfram and tungsten were attached to this element in various countries. Sixty years ago, IUPAC chose wolfram as the official name for the element. A few years later, under pressure from the press in the USA, the alternative name tungsten was also allowed by IUPAC. Now the original, official name 'wolfram' has been deleted by IUPAC as one of the two alternate names for the element. The history of this controversy is described here.

Holden,N.E.

2008-08-11T23:59:59.000Z

83

Plasma focus assisted damage studies on tungsten  

Science Journals Connector (OSTI)

Tungsten is being considered as a front runner choice for the plasma facing component material of next generation fusion reactor because of its superior thermophysical and mechanical properties. Therefore, it is essential to study the ion material interaction of this material for its response to severe conditions of fusion reactor. In this work, we have used an ingenious ion source a namely plasma focus to study the effect of proton irradiation on tungsten under various experimental conditions. Exposed and reference tungsten samples were analyzed using optical microscope, scanning electron microscope, atomic force microscope, grazing incidence X-ray diffraction and Vickers hardness tester. Surface analyses confirm the formation of microcracks, bubbles, blisters, holes, etc. X-ray diffraction pattern confirms the development of compressive stress on the sample due to thermal load and formation of other phases or some expanded phases. A slight reduction in hardness values is observed in case of the exposed sample than the reference sample.

M. Bhuyan; S.R. Mohanty; C.V.S. Rao; P.A. Rayjada; P.M. Raole

2013-01-01T23:59:59.000Z

84

Arc fault detection system  

DOE Patents [OSTI]

An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard.

Jha, Kamal N. (Bethel Park, PA)

1999-01-01T23:59:59.000Z

85

JOURNAL DE PHYSIQUE CoZZoque C7, suppZ6ment au n07, Tome 40, JuiZZet 1979, page C7-243 THE ARC DIAMETER AND RATE OF ROTATIONff A MAGNETICALLY  

E-Print Network [OSTI]

. It has been shown (1)that cathode erosion is negligible and that anode lifetime is depend- ent upon, velocity, anode root Fig. 3 Pholographs of arc, DOA, 160V. 20 I/min. hydrog:.,~. velocity and the drag terminated in a water cooled nozzle (anode). A water cooled rod, tipped with thoriated tungsten served

Boyer, Edmond

86

Process for coating tungsten carbide with cobalt metal  

SciTech Connect (OSTI)

A process is described for coating tungsten carbide with cobalt metal, the process comprising: (a) forming an aqueous slurry of tungsten carbide having a particle size of no greater than - 100 mesh, and zinc metal powder; (b) adding ammonia to the slurry with the amount of the ammonia being sufficient so that the slurry is basic after the subsequent addition of cobalt chloride in step c; (c) adding to the resulting ammoniated slurry, a solution of cobalt chloride with agitation, to form a coating of partially reduced cobalt on the tungsten carbide; (d) removing the resulting cobalt coated tungsten carbide from the resulting liquor; and (e) heating the cobalt coated tungsten carbide in a reducing atmosphere to effect the essentially complete reduction of the cobalt and to produce a cobalt metal coating on the tungsten carbide, the coating making up no greater than about 15% of weight of the tungsten carbide.

Ritsko, J.E.; Lee, J.S.

1989-01-31T23:59:59.000Z

87

Tungsten Mountain Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

Tungsten Mountain Geothermal Area Tungsten Mountain Geothermal Area (Redirected from Tungsten Mountain Area) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Resource Area: Tungsten Mountain Geothermal Area Contents 1 Area Overview 2 History and Infrastructure 3 Regulatory and Environmental Issues 4 Exploration History 5 Well Field Description 6 Geology of the Area 7 Geofluid Geochemistry 8 NEPA-Related Analyses (4) 9 Exploration Activities (4) 10 References Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"300px","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":39.6751,"lon":-117.6945,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

88

Joining of Tungsten Armor Using Functional Gradients  

SciTech Connect (OSTI)

The joining of low thermal expansion armor materials such as tungsten to high thermal expansion heat sink materials has been a major problem in plasma facing component (PFC) development. Conventional planar bonding techniques have been unable to withstand the high thermal induced stresses resulting from fabrication and high heat flux testing. During this investigation, innovative functional gradient joints produced using vacuum plasma spray forming techniques have been developed for joining tungsten armor to copper alloy heat sinks. A model was developed to select the optimum gradient architecture. Based on the modeling effort, a 2mm copper rich gradient was selected. Vacuum plasma pray parameters and procedures were then developed to produce the functional gradient joint. Using these techniques, dual cooling channel, medium scale mockups (32mm wide x 400mm length) were produced with vacuum plasma spray formed tungsten armor. The thickness of the tungsten armor was up to 5mm thick. No evidence of debonding at the interface between the heat sink and the vacuum plasma sprayed material was observed.

John Scott O'Dell

2006-12-31T23:59:59.000Z

89

Measurement and finite element analysis of temperature distribution in arc welding process  

Science Journals Connector (OSTI)

This presentation describes both the experimental measurement and finite element analysis used to study the temperature distribution during a metal inert gas (MIG) welding process, including the cooling down period. Welding was carried out on ... Keywords: FEA, MIG welding, arc welding, cracking, finite element analysis, metal inert gas welding, residual stress, simulation, temperature distribution, weldment temperature

C. K. Lee; J. Candy; C. P. H. Tan

2004-12-01T23:59:59.000Z

90

Welding of cast A359/SiC/10p metal matrix composites  

E-Print Network [OSTI]

arc welding GTAW Gas tungsten arc welding HAZ Heat affected zone HF High frequency MMC Metal matrix composite MMCs Metal matrix composites NDE Non-destructive examination SAW Submerged arc welding SMAW Shielded metal arc... limited their applications. Further, the use of composite materials requires us to stay from the established processes and areas of practice that were relevant to more conventional engineering materials. Except for gas tungsten arc welding (GTAW...

Kothari, Mitul Arvind

2005-11-01T23:59:59.000Z

91

Thiophene Hydrogenation to Tetrahydrothiophene over Tungsten Sulfide Catalysts  

Science Journals Connector (OSTI)

Independent reactions of thiophene reduction to tetrahydrothiophene and thiophene hydrogenolysis to form hydrogen sulfide...4...hydrocarbons are shown to occur over supported tungsten sulfide catalysts and unsupp...

A. V. Mashkina

2003-03-01T23:59:59.000Z

92

Confined plasma gliding arc discharges  

Science Journals Connector (OSTI)

A confined plasma gliding arc is produced in a reactor with two-electrodes contained within a very narrow channel and water spray injected into the discharge. The evolution of pH and conductivity and the formation of hydrogen peroxide in pure water with different carrier gases and the decolourisation and mineralisation of an organic dye were compared with results for a non-confined three-electrode gliding arc reactor. The energy efficiency for the decolourisation of an organic blue dye in the confined reactor is twice that of the non-confined reactor. Significant levels of total organic carbon are removed in the confined plasma reactor.

Radu Burlica; Bruce R. Locke

2008-01-01T23:59:59.000Z

93

A visible light-sensitive tungsten carbide/tungsten trioxde composite photocatalyst  

SciTech Connect (OSTI)

A photocatalyst composed of tungsten carbide (WC) and tungsten oxide (WO{sub 3}) has been prepared by the mechanical mixing of each powder. Its photocatalytic activity was evaluated by the gaseous isopropyl alcohol decomposition process. The photocatalyst showed high visible light photocatalytic activity with a quantum efficiency of 3.2% for 400-530 nm light. The photocatalytic mechanism was explained by means of enhanced oxygen reduction reaction due to WC, which may serve as a multielectron reduction catalyst, as well as the photogeneration of holes in the valence band of WO{sub 3}.

Kim, Young-ho [Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan); Irie, Hiroshi [Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan); Hashimoto, Kazuhito [Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan); Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)

2008-05-05T23:59:59.000Z

94

MagLab - Arc Lamp Tutorial  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

with 2,000 cells to create an arc across a 4-inch (100 millimeter) gap. When suitable electric generators became available in the late 1870s, the practical use of arc lamps began....

95

ARC4461kit  

Broader source: Energy.gov (indexed) [DOE]

talk about a Disaster Supplies Kit? talk about a Disaster Supplies Kit? After a disaster, local officials and relief workers will be on the scene, but they cannot reach everyone immediately. You could get help in hours, or it may take days. Basic services, such as electricity, gas, water, and tele- phones, may be cut off, or you may have to evacuate at a moment's notice. You probably won't have time to shop or search for the supplies you'll need. Your family will cope best by preparing for disaster before it strikes. What is a Disaster Supplies Kit? Assembling the supplies you might need following a disaster is an impor- tant part of your Family Disaster Plan. Following a disaster, having extra sup- plies at home or supplies to take with you in the event of an evacuation can help your family endure evacuation

96

Shunting arc plasma source for pure carbon ion beam  

SciTech Connect (OSTI)

A plasma source is developed using a coaxial shunting arc plasma gun to extract a pure carbon ion beam. The pure carbon ion beam is a new type of deposition system for diamond and other carbon materials. Our plasma device generates pure carbon plasma from solid-state carbon material without using a hydrocarbon gas such as methane gas, and the plasma does not contain any hydrogen. The ion saturation current of the discharge measured by a double probe is about 0.2 mA/mm{sup 2} at the peak of the pulse.

Koguchi, H.; Sakakita, H.; Kiyama, S.; Shimada, T.; Sato, Y.; Hirano, Y. [Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)

2012-02-15T23:59:59.000Z

97

Characterization of arcs in frequency domain  

SciTech Connect (OSTI)

Arc detection systems are developed for ICRH on ITER to prevent arcs from damaging the RF components. One of the detectors, the Sub-Harmonic Arc Detector (SHAD) is based on the detection of the frequencies emitted in the MHz range by arcs [R1]. To ensure the high level of reliability required for this safety system, it is necessary to demonstrate that these frequencies present a signal with a Signal to Noise Ratio high enough to be detected under the wide range of operational conditions (frequency, power, configuration) and for the different types of arcs that can appear in the feeding lines and on the antennas (vacuum arc, glow discharge, multipactor-induced discharge). For each type of arc, we analyze the evolution of the frequency spectrum relative to the evolution of other electrical parameters (reflected power, voltage)

D'Inca, R.; Siegl, G.; Faugel, H.; Braun, F.; Eckert, B.; Bobkov, V. [Max Planck Institut fuer Plasmaphysik, Garching, Germany, EURATOM Association (Germany); El Khaldi, M. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); Noterdaeme, J.-M. [Max Planck Institut fuer Plasmaphysik, Garching, Germany, EURATOM Association (Germany); Gent University, EESA Department (Belgium)

2009-11-26T23:59:59.000Z

98

Lightning Induced Arcing an LDRD Report  

SciTech Connect (OSTI)

The purpose of this research was to develop a science-based understanding of the early-time behavior of electric surface arcing in air at atmospheric pressure. As a first step towards accomplishing this, we used a kinetic approach to model an electron swarm as it evolved in a neutral gas under the influence of an applied electric field. A computer code was written in which pseudo-particles, each representing some number of electrons, were accelerated by an electric field. The electric field due to the charged particles was calculated efficiently using a tree algorithm. Collision of the electrons with the background gas led to the creation of new particles through the processes of ionization and photoionization. These processes were accounted for using measured cross-section data and Monte Carlo methods. A dielectric half-space was modeled by imaging the charges in its surface. Secondary electron emission from the surface, resulting in surface charging, was also calculated. Simulation results show the characteristics of a streamer in three dimensions. A numerical instability was encountered before the streamer matured to form branching.

JORGENSON,ROY E.; WARNE,LARRY K.; KUNHARDT,ERICH E.

2000-12-01T23:59:59.000Z

99

Corrosion and wear resistance of tungsten carbide-cobalt and tungsten carbide-cobalt-chromium thermal spray coatings  

SciTech Connect (OSTI)

Tungsten carbide thermal spray coatings provide wear surfaces to new and overhauled components for various industries. Their wear resistance is obtained by incorporating small tungsten carbide particles into a metal matrix. This presentation will show what parameters influence their corrosion resistance in the ASTM B-117 Salt Spray Corrosion Test,

Quets, J.; Alford, J.R.

1999-07-01T23:59:59.000Z

100

Filters for cathodic arc plasmas  

DOE Patents [OSTI]

Cathodic arc plasmas are contaminated with macroparticles. A variety of magnetic plasma filters has been used with various success in removing the macroparticles from the plasma. An open-architecture, bent solenoid filter, with additional field coils at the filter entrance and exit, improves macroparticle filtering. In particular, a double-bent filter that is twisted out of plane forms a very compact and efficient filter. The coil turns further have a flat cross-section to promote macroparticle reflection out of the filter volume. An output conditioning system formed of an expander coil, a straightener coil, and a homogenizer, may be used with the magnetic filter for expanding the filtered plasma beam to cover a larger area of the target. A cathodic arc plasma deposition system using this filter can be used for the deposition of ultrathin amorphous hard carbon (a-C) films for the magnetic storage industry.

Anders, Andre (Albany, CA); MacGill, Robert A. (Richmond, CA); Bilek, Marcela M. M. (Engadine, AU); Brown, Ian G. (Berkeley, CA)

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Fullerene Formation in Carbon Arc:? Electrode Gap Dependence and Plasma Spectroscopy  

Science Journals Connector (OSTI)

The arc discharge technique is presently considered the most efficient method for the production of fullerene. ... The experiments were carried out in a fullerene arc reactor operating in a semi-continuous fashion, described previously in detail by Huczko et al.20 On the basis of earlier work,20-22 the parameters, ac or dc feeding mode, input power, buffer gas, and pressure, were optimized and electrode gaps between 0.5 and 4 mm were used for dc arcing. ... The interelectrode gap strongly influences the electric properties of the arc and characteristics of generated carbon plasma as well as the radiation level and heat exchange between the plasma and the surrounding high-temperature zone. ...

Andrzej Huczko; Hubert Lange; Przemyslaw Byszewski; Magdalena Poplawska; Andrzej Starski

1997-02-13T23:59:59.000Z

102

Adsorption of carbonyl sulfide on nickel and tungsten films  

SciTech Connect (OSTI)

The interaction of carbonyl sulfide with evaporated nickel and tungsten films has been investigated in the temperature range 195-450 K using gas pressures ranging from 1 to 13 N m/sup -2/. Rapid but mainly associative chemisorption of COS occurred on both metals at 195 K. Further adsorption of COS on W at temperatures 293-450 K was extremely slow and accompanied by more CO desorption than COS adsorbed. Sulfidation of Ni film by COS occurred at temperatures greater than or equal to 293 K with the liberation of carbon monoxide. The rate of adsorption increased with temperature but was independent of COS pressure. The activation energy (E/sub x/) increased with extent (X) of sulfidation to a limiting value of 97 kJ mol/sup -1/. A linear relationship was obtained from the plot of E/sub x/ against 1/X, suggesting the applicability of Cabrera-Mott theory to the sulfidation of Ni film by COS. 20 references, 2 figures, 1 table.

Saleh, J.M.; Nasser, F.A.K.

1985-07-18T23:59:59.000Z

103

Vacuum arc ignition by penning discharge in a strong magnetic field  

SciTech Connect (OSTI)

Vacuum arc with cathode spots on the cold electrode is widely used as a plasma generator in a such kind of devices like metal ion sources, plasma cathode electron guns, thing films deposition facilities and others. Most vacuum arc devices utilize a high voltage discharge across an insulator surface to provide a trigger plasma which in turn initiates the main arc discharge. Operation of vacuum arc in a repetitively pulsed mode required a stable triggering system for the long time. But with a discharge across the insulators the number of stable pulses is limited by 100,000 or little bit more. The better method for vacuum arc ignition is low pressure discharge. As shown in this paper it is possible to increase the lifetime of the ignition system in 10 times at least, but negative characteristic of this system is a relatively high pressure (about 0.1 mtorr). In some kinds of vacuum arc applications it is impermissible because it leads to the {open_quotes}contamination{close_quotes} of the metal plasma by the gaseous one. In order to decrease the background pressure, using the gas discharge ignition system for vacuum arc, Penning discharge is suggested. The main new feature of this system is an applying the strong magnetic field not only for stabilization of the cathode spot moving and for the rise the high charge states of ions in metal plasma, but also for the essential decrease the lowest point of the background gas pressure when the Penning discharge is still in a stable operation. Under the stable mode of Penning discharge there was always a stable vacuum arc ignition.

Nikolaev, A.G.; Schanin, P.M.; Yushkov, G.Yu. [High Current Electronics Inst., Tomsk (Russian Federation)] [and others

1995-12-31T23:59:59.000Z

104

Reduced ternary molybdenum and tungsten sulfides and hydroprocessing catalysis therewith  

DOE Patents [OSTI]

New amorphous molybdenum/tungsten sulfides with the general formula M.sup.n+.sub.2x/n (L.sub.6 S.sub.8)S.sub.x, where L is molybdenum or tungsten and M is a ternary metal, has been developed. Characterization of these amorphous materials by chemical and spectroscopic methods (IR, Raman, PES) shows that the (M.sub.6 S.sub.8).sup.0 cluster units are present. Vacuum thermolysis of the amorphous Na.sub.2x (Mo.sub.6 S.sub.8)S.sub.x .multidot.yMeOH first produces poorly crystalline NaMo.sub.6 S.sub.8 by disproportionation at 800.degree. C. and well-crystallized NaMo.sub.6 S.sub.8 at .gtoreq. 900.degree. C. Ion-exchange of the sodium material in methanol with soluble M.sup.2+ and M.sup.3+ salts (M=Sn, Co, Ni, Pb, La, Ho) produces the M.sup.n+.sub.2x/n (Mo.sub.6 S.sub.8)S.sub.x .multidot.yMeOH compounds. Additionally, the new reduced ternary molybdenum sulfides with the general formula M.sup.n+.sub.2x/n Mo.sub.6 S.sub.8+x (MeOH).sub.y ›MMOS! (M=Sn, Co, Ni) is an effective hydrodesulfurization (HDS) catalyst both as-prepared and after a variety of pretreatment conditions. Under specified pretreatment conditions with flowing hydrogen gas, the SnMoS type catalyst can be stabilized, and while still amorphous, can be considered as "Chevrel phase-like" in that both contain Mo.sub.6 S.sub.8 cluster units. Furthermore, the small cation NiMoS and CoMoS type pretreated catalyst showed to be very active HDS catalysts with rates that exceeded the model unpromoted and cobalt-promoted MoS.sub.2 catalysts.

Hilsenbeck, Shane J. (Ames, IA); McCarley, Robert E. (Ames, IA); Schrader, Glenn L. (Ames, IA); Xie, Xiaobing (College Station, TX)

1999-02-16T23:59:59.000Z

105

Preparation and electrocatalytic activity of tungsten carbide and titania nanocomposite  

SciTech Connect (OSTI)

Graphical abstract: The electrocatalytic activity of tungsten carbide and titania nanocomposite is related to the structure, crystal phase and chemical components of the nanocomposite, and is also affected by the property of electrolyte. A synergistic effect exists between tungsten carbide and titania of the composite. Highlights: {yields} Electrocatalytic activity of tungsten carbide and titania nanocomposite with core-shell structure. {yields} Activity is related to the structure, crystal phase and chemical component of the nanocomposite. {yields} The property of electrolyte affects the electrocatalytic activity. {yields} A synergistic effect exists between tungsten carbide and titania of the composite. -- Abstract: Tungsten carbide and titania nanocomposite was prepared by combining a reduced-carbonized approach with a mechanochemical approach. The samples were characterized by X-ray diffraction, transmission electron microscope under scanning mode and X-ray energy dispersion spectrum. The results show that the crystal phases of the samples are composed of anatase, rutile, nonstoichiometry titanium oxide, monotungsten carbide, bitungsten carbide and nonstoichiometry tungsten carbide, and they can be controlled by adjusting the parameters of the reduced-carbonized approach; tungsten carbide particles decorate on the surface of titania support, the diameter of tungsten carbide particle is smaller than 20 nm and that of titania is around 100 nm; the chemical components of the samples are Ti, O, W and C. The electrocatalytic activity of the samples was measured by a cyclic voltammetry with three electrodes. The results indicate that the electrocatalytic activities of the samples are related to their crystal phases and the property of electrolyte in aqueous solution. A synergistic effect between titania and tungsten carbide is reported for the first time.

Hu, Sujuan; Shi, Binbin; Yao, Guoxing [State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, School of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032 (China)] [State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, School of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032 (China); Li, Guohua, E-mail: nanozjut@zjut.edu.cn [State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, School of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032 (China)] [State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, School of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032 (China); Ma, Chunan [State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, School of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032 (China)] [State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, School of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032 (China)

2011-10-15T23:59:59.000Z

106

Processing and properties of extruded tungsten-hafnium and tungsten-steel composites  

SciTech Connect (OSTI)

The purpose of this study was to evaluate the processing behavior and properties of tungsten-hafnium (W-Hf) and W-steel composites produced by hot extrusion of canned powders. The W-Hf composite was consolidated by extrusion of blended powders with preheat temperatures over the temperature range of 1100 to 1400{degrees}C. All extrusions produced fully dense material which exhibits elongation of the tungsten phase within the hafnium matrix. The flow stress, as characterized by the extrusion constant, decreases with increasing temperature up to 1300{degrees}C and increases substantially at 1400{degrees}C as significant quantities of intermetallic phase are formed during preheating. The room-temperature (RT) hardness and compressive yield stress increase modestly with increased extrusion ratio and are not affected by extrusion temperature in the range 1100 to 1300{degrees}C. The microstructures are essentially fully recrystallized at the 1300{degrees}C preheat temperature and partially recrystallized at lower temperatures. Additionally, a mixture of tungsten and steel powder was consolidated to full density by hot extrusion at a 1000{degrees}C preheat temperature and a reduction ratio of 4.2. Increased reduction of the W-steel composite results in increased RT hardness.

Ohriner, E.K.; Sikka, V.K. [Oak Ridge National Lab., TN (United States); Kapoor, D. [Army Armament Research and Development Engineering Center, Dover, NJ (United States)

1995-02-01T23:59:59.000Z

107

Tungsten Mtn Geothermal Project | Open Energy Information  

Open Energy Info (EERE)

Mtn Geothermal Project Mtn Geothermal Project Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Development Project: Tungsten Mtn Geothermal Project Project Location Information Coordinates 39.723055555556°, -118.08027777778° 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":39.723055555556,"lon":-118.08027777778,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

108

It's Elemental - Isotopes of the Element Tungsten  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tantalum Tantalum Previous Element (Tantalum) The Periodic Table of Elements Next Element (Rhenium) Rhenium Isotopes of the Element Tungsten [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 180 0.12% >= 6.6×10+17 years 182 26.50% STABLE 183 14.31% > 1.3×10+19 years 184 30.64% STABLE 186 28.43% > 2.3×10+19 years Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 157 275 milliseconds Electron Capture No Data Available 158 1.25 milliseconds Alpha Decay 100.00% 158m 0.143 milliseconds Isomeric Transition No Data Available Alpha Decay No Data Available 159 7.3 milliseconds Alpha Decay ~ 99.90%

109

Rhenium alloying of tungsten heavy alloys  

SciTech Connect (OSTI)

Alloying experiments were performed using rhenium additions to a classic 90 mass % tungsten heavy alloy. The mixed-powder system was liquid phase sintered to full density at 1500 C in 60 min The rhenium-modified alloys exhibited a smaller grain size, higher hardness, higher strength, and lower ductility than the unalloyed system. For an alloy with a composition of 84W-6Re-8Ni-2Fe, the sintered density was 17, 4 Mg/m{sup 3} with a yield strength of 815 MPa, tensile strength of 1180 MPa, and elongation to failure of 13%. This property combination results from the aggregate effects of grain size reduction and solid solution hardening due to rhenium. In the unalloyed system these properties require post-sintering swaging and aging; thus, alloying with rhenium is most attractive for applications where net shaping is desired, such as by powder injection molding.

German, R.M.; Bose, A.; Jerman, G.

1989-01-01T23:59:59.000Z

110

Miniaturized cathodic arc plasma source  

DOE Patents [OSTI]

A cathodic arc plasma source has an anode formed of a plurality of spaced baffles which extend beyond the active cathode surface of the cathode. With the open baffle structure of the anode, most macroparticles pass through the gaps between the baffles and reflect off the baffles out of the plasma stream that enters a filter. Thus the anode not only has an electrical function but serves as a prefilter. The cathode has a small diameter, e.g. a rod of about 1/4 inch (6.25 mm) diameter. Thus the plasma source output is well localized, even with cathode spot movement which is limited in area, so that it effectively couples into a miniaturized filter. With a small area cathode, the material eroded from the cathode needs to be replaced to maintain plasma production. Therefore, the source includes a cathode advancement or feed mechanism coupled to cathode rod. The cathode also requires a cooling mechanism. The movable cathode rod is housed in a cooled metal shield or tube which serves as both a current conductor, thus reducing ohmic heat produced in the cathode, and as the heat sink for heat generated at or near the cathode. Cooling of the cathode housing tube is done by contact with coolant at a place remote from the active cathode surface. The source is operated in pulsed mode at relatively high currents, about 1 kA. The high arc current can also be used to operate the magnetic filter. A cathodic arc plasma deposition system using this source can be used for the deposition of ultrathin amorphous hard carbon (a-C) films for the magnetic storage industry.

Anders, Andre (Albany, CA); MacGill, Robert A. (Richmond, CA)

2003-04-15T23:59:59.000Z

111

Growth of Ordered Ultrathin Tungsten Oxide Films on Pt(111)....  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

tungsten oxide ultra-thin films were prepared on a Pt(111) substrate at 700 K via direct sublimation of monodispersed cyclic (WO3)3 trimers. The surface composition, structure and...

112

Electrochemistry of (Dihapto-Buckminster-Fullerene) Pentacarbonyl Tungsten(0)  

Science Journals Connector (OSTI)

Cyclic voltammetry experiments on [60]fullerene, (C60), and (dihapto-[60]fullerene) pentacarbonyl tungsten(0), (?2-C60)W(CO)5, constitute an educational experiment for the inorganic chemistry laboratory with a primary objective to teach the chemical ...

Elvin Igartúa-Nieves; Yessenia Ocasio-Delgado; José Rivera-Pagán; José E. Cortés-Figueroa

2007-09-01T23:59:59.000Z

113

Microstructured tungsten thermophotovoltaic selective emitters c by Natalija (Zorana) Jovanovi?.  

E-Print Network [OSTI]

This research investigates the fabrication, modeling, characterization, and application of tungsten two-dimensional (2D) photonic crystal (PhC) structures as selective emitters and means of achieving higher efficiencies ...

Jovanovic, Natalija Zorana

2008-01-01T23:59:59.000Z

114

On the time–scales of magmatism at island–arc volcanoes  

Science Journals Connector (OSTI)

...absent. Numerous studies in the Cascades, Tonga and Vanuatu have consistently...shallow mantle melting under the Cascades volcanoc arc. Geology 29...Vergniolle, S. 1989 Pressure, gas content and eruption periodicity...high-pressure experiments and natural rocks. J. Volcanol. Geotherm...

2002-01-01T23:59:59.000Z

115

Plasma of Electric Arc Discharge between Melted Electrodes  

Science Journals Connector (OSTI)

Plasma of electric arc discharge between melted electrodes was experimentally investigated. Diagnostics of electric arc plasma was carried out. Optical emission and ... in plasma tends to be located at the arc ax...

A.N. Veklich; I.L. Babich

2001-01-01T23:59:59.000Z

116

Surface Coating of Tungsten Carbide by Electric Exploding of Contact  

SciTech Connect (OSTI)

Electric exploding of a tungsten carbide--cobalt material near-by high-speed steel surface forms on it a hardening coating. The essential structure properties of the formed coatings are determined by parameters of contact exploding electrode at the pulse current amplitude from above 106 A/cm2 and duration less than 10-4 s. The metallographic investigations of coating structures were done by microscope 'Neophot-24'. They have shown that the contact electric exploding caused the transfer of tungsten carbide and cobalt on the surface of high-speed steel. The breakdown of tungsten carbide--cobalt material took place during electrical exploding. The hardening layers of tungsten carbide and pure nanocrystalline tungsten have been formed upon the surface of high-speed steel as a result of electric exploding. Crystalline grains of tungsten have an almost spherical form and their characteristic size less than 400 nanometers. Micro hardness of the coating layers and high-speed steel structures was measured.

Grigoryev, Evgeny G. [General Physics Department, Moscow Engineering Physics Institute, Kashirskoe sh. 31, Moscow, 115409 (Russian Federation)

2011-01-17T23:59:59.000Z

117

The Temperature of the Copper Arc  

Science Journals Connector (OSTI)

...Laboratory, General Electric Company. | Journal Article...TEMPERATURE OF THE COPPER ARC By C. G. SUITS RESEARCH LABORATORY, GENERAL ELECTRIC COMPANY Read before the...figure 1, where Fis an arc burning between the electrodes...experiment is a condensed discharge between the electrode...

C. G. Suits

1935-01-01T23:59:59.000Z

118

Local arc discharge mechanism and requirements of power supply in micro-arc oxidation of magnesium alloy  

Science Journals Connector (OSTI)

To study the requirements of the power supply in micro-arc oxidation (MAO) of magnesium alloy, many experiments ... . Based on the experimental results and electric arc theory, the separate local arc discharge me...

Ming Chen; Yuezhou Ma; Yuan Hao

2010-03-01T23:59:59.000Z

119

Nitrogen Control in Electric Arc Furnace Steelmaking by Direct...  

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

Nitrogen Control in Electric Arc Furnace Steelmaking by Direct Reduced Iron Fines Injection Nitrogen Control in Electric Arc Furnace Steelmaking by Direct Reduced Iron Fines...

120

Tribological performance of hybrid filtered arc-magnetron coatings...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tribological performance of hybrid filtered arc-magnetron coatings - Part I: Coating deposition process and basic coating Tribological performance of hybrid filtered arc-magnetron...

Note: This page contains sample records for the topic "gas tungsten arc" 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

Tungsten and tungsten alloy powder metallurgy: Powder production and applications excluding lamps. (Latest citations from the US Patent bibliographic file with exemplary claims). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations of selected patents concerning the preparation of metallic and ceramic powders of tungsten and tungsten alloys, including applications of these materials. The hydrogen reduction of tungsten compounds together with alloying element compounds produce forms with characteristics of high density, hardness, wear resistance, high melting points, and abrasiveness. Topics include production of cathodes, heaters, filament wires, electrical contacts, acoustic absorbers, high-density sheets and coatings, hard penetrators, and tungsten carbide and metallized ceramics. Tungsten halogen lamps are examined in a separate bibliography.(Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1997-01-01T23:59:59.000Z

122

Tungsten and tungsten alloy powder metallurgy: Powder production and applications excluding lamps. (Latest citations from the US Patent database). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations of selected patents concerning the preparation of metallic and ceramic powders of tungsten and tungsten alloys, including applications of these materials. The hydrogen reduction of tungsten compounds together with alloying element compounds produce forms with characteristics of high density, hardness, wear resistance, high melting points, and abrasiveness. Topics include production of cathodes, heaters, filament wires, electrical contacts, acoustic absorbers, high-density sheets and coatings, hard penetrators, and tungsten carbide and metallized ceramics. Tungsten halogen lamps are examined in a separate bibliography. (Contains a minimum of 97 citations and includes a subject term index and title list.)

Not Available

1993-05-01T23:59:59.000Z

123

Tungsten and tungsten alloy powder metallurgy: Powder production and applications excluding lamps. (Latest citations from the US Patent bibliographic file with exemplary claims). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations of selected patents concerning the preparation of metallic and ceramic powders of tungsten and tungsten alloys, including applications of these materials. The hydrogen reduction of tungsten compounds together with alloying element compounds produce forms with characteristics of high density, hardness, wear resistance, high melting points, and abrasiveness. Topics include production of cathodes, heaters, filament wires, electrical contacts, acoustic absorbers, high-density sheets and coatings, hard penetrators, and tungsten carbide and metallized ceramics. Tungsten halogen lamps are examined in a separate bibliography.(Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1995-12-01T23:59:59.000Z

124

Tungsten and tungsten alloy powder metallurgy: Powder production and applications excluding lamps. (Latest citations from the US Patent bibliographic file with exemplary claims). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations of selected patents concerning the preparation of metallic and ceramic powders of tungsten and tungsten alloys, including applications of these materials. The hydrogen reduction of tungsten compounds together with alloying element compounds produce forms with characteristics of high density, hardness, wear resistance, high melting points, and abrasiveness. Topics include production of cathodes, heaters, filament wires, electrical contacts, acoustic absorbers, high-density sheets and coatings, hard penetrators, and tungsten carbide and metallized ceramics. Tungsten halogen lamps are examined in a separate bibliography. (Contains a minimum of 115 citations and includes a subject term index and title list.)

NONE

1995-02-01T23:59:59.000Z

125

Theoretical analysis of ARC constriction  

SciTech Connect (OSTI)

The physics of the thermionic converter is governed by strong electrode-plasma interactions (emissions surface scattering, charge exchange) and weak interactions (diffusion, radiation) at the maximum interelectrode plasma radius. The physical processes are thus mostly convective in thin sheaths in front of the electrodes and mostly diffusive and radiative in the plasma bulk. The physical boundaries are open boundaries to particle transfer (electrons emitted or absorbed by the electrodes, all particles diffusing through some maximum plasma radius) and to convective, conductive and radiative heat transfer. In a first approximation the thermionic converter may be described by a one-dimensional classical transport theory. The two-dimensional effects may be significant as a result of the sheath sensitivity to radial plasma variations and of the strong sheath-plasma coupling. The current-voltage characteristic of the converter is thus the result of an integrated current density over the collector area for which the boundary conditions at each r determine the regime (ignited/unignited) of the local current density. A current redistribution strongly weighted at small radii (arc constriction) limits the converter performance and opens questions on constriction reduction possibilities. The questions addressed are the followng: (1) what are the main contributors to the loss of current at high voltage in the thermionic converter; and (2) is arc constriction observable theoretically and what are the conditions of its occurrence. The resulting theoretical problem is formulated and results are given. The converter electrical current is estimated directly from the electron and ion particle fluxes based on the spatial distribution of the electron/ion density n, temperatures T/sub e/, T/sub i/, electrical voltage V and on the knowledge of the transport coefficients. (WHK)

Stoenescu, M.L.; Brooks, A.W.; Smith, T.M.

1980-12-01T23:59:59.000Z

126

Characterization of the reactive and dissociative behavior of transition metal oxide cluster ions in the gas phase  

Science Journals Connector (OSTI)

The reactive and dissociative behavior of molybdenum and tungsten oxide cluster ions has been studied in the gas phase using a triple quadrupole mass spectrometer. Cluster ions (MO3) n ...

Simin Maleknia; Jennifer Brodbelt…

1991-05-01T23:59:59.000Z

127

VAPORIZATION OF TUNGSTEN-METAL IN STEAM AT HIGH TEMPERATURES.  

SciTech Connect (OSTI)

The vaporization of tungsten from the APT spallation target dominates the radiological source term for unmitigated target overheating accidents. Chemical reactions of tungsten with steam which persist to tungsten temperatures as low as 800 C result in the formation of a hydrated tungsten-oxide which has a high vapor pressure and is readily convected in a flowing atmosphere. This low-temperature vaporization reaction essentially removes the oxide film that forms on the tungsten-metal surface as soon as it forms, leaving behind a fresh metallic surface for continued oxidation and vaporization. Experiments were conducted to measure the oxidative vaporization rates of tungsten in steam as part of the effort to quantify the MT radiological source term for severe target accidents. Tests were conducted with tungsten rods (1/8 inch diameter, six inches long) heated to temperatures from approximately 700 C to 1350 C in flowing steam which was superheated to 140 C. A total of 19 experiments was conducted. Fifteen tests were conducted by RF induction heating of single tungsten rods held vertical in a quartz glass retort. Four tests were conducted in a vertically-mounted tube furnace for the low temperature range of the test series. The aerosol which was generated and transported downstream from the tungsten rods was collected by passing the discharged steam through a condenser. This procedure insured total collection of the steam along with the aerosol from the vaporization of the rods. The results of these experiments revealed a threshold temperature for tungsten vaporization in steam. For the two tests at the lowest temperatures which were tested, approximately 700 C, the tungsten rods were observed to oxidize without vaporization. The remainder of the tests was conducted over the temperature range of 800 C to 1350 C. In these tests, the rods were found to have lost weight due to vaporization of the tungsten and the missing weight was collected in the downstream condensate system. The aerosol formed a fine white smoke of tungsten-oxide which was visible to the eye as it condensed in the laminar boundary layer of steam which flowed along the surface of the rod. The aerosol continued to flow as a smoke tube downstream of the rod, flowing coaxially along the centerline axis of the quartz glass tube and depositing by impaction along the outside of a bend and at sudden area contractions in the piping. The vaporization rate data from the 17 experiments which exceeded the vaporization threshold temperature are shown in Figure 5 in the form of vaporization rates (g/cm{sup 2} s) vs. inverse temperature (K{sup {minus}1}). Two correlations to the present data are presented and compared to a published correlation by Kilpatrick and Lott. The differences are discussed.

GREENE,G.A.; FINFROCK,C.C.

2000-10-01T23:59:59.000Z

128

Magnetic-cusp, cathodic-arc source  

DOE Patents [OSTI]

A magnetic-cusp for a cathodic-arc source wherein the arc is confined to the desired cathode surface, provides a current path for electrons from the cathode to the anode, and utilizes electric and magnetic fields to guide ions from the cathode to a point of use, such as substrates to be coated. The magnetic-cusp insures arc stability by an easy magnetic path from anode to cathode, while the straight-through arrangement leads to high ion transmission. 3 figs.

Falabella, S.

1995-11-21T23:59:59.000Z

129

Magnetoresistive conductive polymer-tungsten trioxide nanocomposites with ultrahigh sensitivity at low magnetic field  

E-Print Network [OSTI]

containing tungsten trioxide (WO3) nanoparticles. These nanocomposites have demonstrated ultrahigh MRMagnetoresistive conductive polymer-tungsten trioxide nanocomposites with ultrahigh sensitivity polymers and their nanocomposite systems has attracted intense interests due to their easy synthesis, low

Guo, John Zhanhu

130

Compressibility and strength of nanocrystalline tungsten boride under compression to 60GPa  

E-Print Network [OSTI]

interest in transition metal borides (TMs) as potential new avenues for synthesizing hard materials.1­4 Tungsten borides, WBx, which include WB, WB2, and WB4 and are analogous to tungsten carbides, have been

Duffy, Thomas S.

131

Achievement Rewards for College Scientists ARCS Foundation, Inc.  

E-Print Network [OSTI]

Achievement Rewards for College Scientists ARCS Foundation, Inc. For more information on how of the ARCS Foundation, Inc. funds seven scholarships for exceptional University of Georgia doctoral students. Available to attend the ARCS Foundation Awards Luncheon in Atlanta on November 21, 2013. ARCS Foundation

Arnold, Jonathan

132

Continuous nanoparticle generation and assembly by atmospheric pressure arc discharge  

E-Print Network [OSTI]

Continuous nanoparticle generation and assembly by atmospheric pressure arc discharge Jesse J. Cole a dc arc discharge plasma. The particles are positively charged by the arc and form a room temperature precursor materials.5,6 High temperature plasmas in the form of dc arc discharges led to the discovery

Jacobs, Heiko O.

133

AdaptiveARC | Open Energy Information  

Open Energy Info (EERE)

AdaptiveARC AdaptiveARC Jump to: navigation, search Name AdaptiveARC Address 7683 Sitio Manana Place Carlsbad, California Zip 92009 Sector Biomass Product Waste-to-clean-energy startup is developing an arc-plasma reactor Website http://www.adaptivearc.com/ Coordinates 33.07959°, -117.22539° 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":33.07959,"lon":-117.22539,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

134

Arc Statistics in Clusters: Galaxy Contribution  

E-Print Network [OSTI]

The frequency with which background galaxies appear as long arcs as a result of gravitational lensing by foreground clusters of galaxies has recently been found to be a very sensitive probe of cosmological models by Bartelmann et al. (1998). They have found that such arcs would be expected far less frequently than observed (by an order of magnitude) in the currently favored model for the universe, with a large cosmological constant $\\Omega_\\Lambda \\sim 0.7$. Here we analyze whether including the effect of cluster galaxies on the likelihood of clusters to generate long-arc images of background galaxies can change the statistics. Taking into account a variety of constraints on the properties of cluster galaxies, we find that there are not enough sufficiently massive galaxies in a cluster for them to significantly enhance the cross section of clusters to generate long arcs. We find that cluster galaxies typically enhance the cross section by only $\\lesssim 15%$.

R. A. Flores; A. H. Maller; J. R. Primack

1999-09-23T23:59:59.000Z

135

Detection of arcs in automotive electrical systems  

E-Print Network [OSTI]

At the present time, there is no established method for the detection of DC electric arcing. This is a concern for forthcoming advanced automotive electrical systems which consist of higher DC electric power bus voltages, ...

Mishrikey, Matthew David

2005-01-01T23:59:59.000Z

136

Mechanism of vacancy formation induced by hydrogen in tungsten  

SciTech Connect (OSTI)

We report a hydrogen induced vacancy formation mechanism in tungsten based on classical molecular dynamics simulations. We demonstrate the vacancy formation in tungsten due to the presence of hydrogen associated directly with a stable hexagonal self-interstitial cluster as well as a linear crowdion. The stability of different self-interstitial structures has been further studied and it is particularly shown that hydrogen plays a crucial role in determining the configuration of SIAs, in which the hexagonal cluster structure is preferred. Energetic analysis has been carried out to prove that the formation of SIA clusters facilitates the formation of vacancies. Such a mechanism contributes to the understanding of the early stage of the hydrogen blistering in tungsten under a fusion reactor environment.

Liu, Yi-Nan [School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191 (China) [School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191 (China); Association EURATOM-TEKES, University of Helsinki, Helsinki, PO Box 64, 00560 (Finland); Ahlgren, T.; Bukonte, L.; Nordlund, K. [Association EURATOM-TEKES, University of Helsinki, Helsinki, PO Box 64, 00560 (Finland)] [Association EURATOM-TEKES, University of Helsinki, Helsinki, PO Box 64, 00560 (Finland); Shu, Xiaolin; Yu, Yi; Lu, Guang-Hong, E-mail: LGH@buaa.edu.cn [School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191 (China)] [School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191 (China); Li, Xiao-Chun [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, 230031 (China)] [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, 230031 (China)

2013-12-15T23:59:59.000Z

137

A history of tungsten- and molybdenum-base alloys  

SciTech Connect (OSTI)

The development of tungsten and molybdenum alloys was initiated in the early 1900s in search of a better electric lamp filament with tantalum, tungsten, rhenium, and osmium being the prime candidates. The efforts required for accomplishment of the task led to refining oxides to high purity, reduction of the oxides to metal powders, forming green product forms by extrusion or pressing, and finally sintering by electric furnace and self-heating by direct current almost to the melting point. The technology required for producing lamp filaments led to the development of the powder metallurgy field and early research on high-melting-temperature metals. During the period 1909 through 1959, most of the tungsten-molybdenum, high-melting-temperature element alloys were developed and produced in almost any product form required.

Heestand, R.L.

1993-05-01T23:59:59.000Z

138

A history of tungsten- and molybdenum-base alloys  

SciTech Connect (OSTI)

The development of tungsten and molybdenum alloys was initiated in the early 1900s in search of a better electric lamp filament with tantalum, tungsten, rhenium, and osmium being the prime candidates. The efforts required for accomplishment of the task led to refining oxides to high purity, reduction of the oxides to metal powders, forming green product forms by extrusion or pressing, and finally sintering by electric furnace and self-heating by direct current almost to the melting point. The technology required for producing lamp filaments led to the development of the powder metallurgy field and early research on high-melting-temperature metals. During the period 1909 through 1959, most of the tungsten-molybdenum, high-melting-temperature element alloys were developed and produced in almost any product form required.

Heestand, R.L.

1993-01-01T23:59:59.000Z

139

FRACTURE AND CREEP IN AN ALL-TUNGSTEN DIVERTOR FOR ARIES James P. Blanchard  

E-Print Network [OSTI]

FRACTURE AND CREEP IN AN ALL-TUNGSTEN DIVERTOR FOR ARIES James P. Blanchard University of Wisconsin proposing an all-tungsten divertor for their tokamak designs. In designing such a component, fracture a series of fracture mechanics-based analyses to demonstrate the feasibility of using an all- tungsten

140

Investigation on oblique shock wave control by arc discharge plasma in supersonic airflow  

SciTech Connect (OSTI)

Wedge oblique shock wave control by arc discharge plasma in supersonic airflow was investigated theoretically, experimentally, and numerically in this paper. Using thermal choking model, the change in oblique shock wave was deduced, which refer that the start point of shock wave shifts upstream, the shock wave angle decreases, and its intensity weakens. Then the theoretical results were validated experimentally in a Mach 2.2 wind tunnel. On the test conditions of arc discharge power of approx1 kW and arc plasma temperature of approx3000 K, schlieren photography and gas pressure measurements indicated that the start point of shock wave shifted upstream of approx4 mm, the shock wave angle decreased 8.6%, and its intensity weakened 8.8%. The deduced theoretical results match the test results qualitatively, so thermal mechanism and thermal choking model are rational to explain the problem of oblique shock wave control by arc discharge plasma. Finally, numerical simulation was developed. Based on thermal mechanism, the arc discharge plasma was simplified as a thermal source term that added to the Navier-Stokes equations. The simulation results of the change in oblique shock wave were consistent with the test results, so the thermal mechanism indeed dominates the oblique shock wave control process.

Wang Jian; Li Yinghong [Engineering College, Air Force Engineering University, Xi'an 710038 (China); Xing Fei [College of Economics and Management, Northwest University of Politics and Law, Xi'an 710063 (China)

2009-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Ion source with improved primary arc collimation  

DOE Patents [OSTI]

An improved negative ion source is provided in which a self-biasing, molybdenum collimator is used to define the primary electron stream arc discharge from a filament operated at a negative potential. The collimator is located between the anode and the filament. It is electrically connected to the anode by means of an appropriate size resistor such that the collimator is biased at essentially the filament voltage during operation. Initially, the full arc voltage appears across the filament to collimator until the arc discharge strikes. Then the collimator biases itself to essentially filament potential due to current flow through the resistor thus defining the primary electron stream without intercepting any appreciable arc power. The collimator aperture is slightly smaller than the anode aperture to shield the anode from the arc power, thereby preventing the exposure of the anode to the full arc power which, in the past, has caused overheating and erosion of the anode collimator during extended time pulsed-beam operation of the source. With the self-biasing collimator of this invention, the ion source may be operated from short pulse periods to steady-state without destroying the anode.

Dagenhart, William K. (Oak Ridge, TN)

1985-01-01T23:59:59.000Z

142

Effects of sequential tungsten and helium ion implantation on nano-indentation hardness of tungsten  

SciTech Connect (OSTI)

To simulate neutron and helium damage in a fusion reactor first wall sequential self-ion implantation up to 13 dpa followed by helium-ion implantation up to 3000 appm was performed to produce damaged layers of {approx}2 {mu}m depth in pure tungsten. The hardness of these layers was measured using nanoindentation and was studied using transmission electron microscopy. Substantial hardness increases were seen in helium implanted regions, with smaller hardness increases in regions which had already been self-ion implanted, thus, containing pre-existing dislocation loops. This suggests that, for the same helium content, helium trapped in distributed vacancies gives stronger hardening than helium trapped in vacancies condensed into dislocation loops.

Armstrong, D. E. J.; Edmondson, P. D.; Roberts, S. G. [Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH (United Kingdom)] [Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH (United Kingdom)

2013-06-24T23:59:59.000Z

143

ARC-HEATED GAS FLOW EXPERIMENTS FOR HYPERSONIC PROPULSION  

E-Print Network [OSTI]

was extensively developed for the purpose of eventually performing experiments simulating scramjet engine flow

Texas at Arlington, University of

144

The Consumption of Carbon in the Electric Arc. I. Variation with Current and Arc-Length. II. Influence upon the Luminous Radiation from the Arc  

Science Journals Connector (OSTI)

1 December 1915 research-article The Consumption of Carbon in the Electric Arc. I. Variation with Current and Arc-Length. II. Influence upon the Luminous Radiation from the...

1915-01-01T23:59:59.000Z

145

The dependence of extracted current on discharge gas pressure in neutral beam ion sources on HL-2A tokamak  

SciTech Connect (OSTI)

The discharge gas pressure is a key factor to influence the extracted current of ion source. In this paper, the dependence of extracted current on discharge gas pressure was investigated in detail at different arc discharge currents. The discharge gas pressure with a very broad range (0.1 Pa-2.7 Pa) was scanned for the first time. It is turned out that, with the increasing of discharge gas pressure, the extracted current increases and the arc voltage decreases at different arc currents; however, when the discharge gas pressure exceeds a certain value, the extracted current decreases. For the same discharge gas pressure, the higher the arc current, the higher the arc voltage and the extracted current are. The arc efficiency was also calculated, and its dependence on gas pressure was almost the same with the dependence of extracted current on gas pressure, but at the same discharge gas pressure, the lower the arc current, the higher the arc efficiency is and the lower the extracted current is.

Wei, H. L.; Cao, J. Y.; Rao, J.; Lei, G. J.; Jiang, S. F.; Liu, H.; Yu, L. M.; Xie, W. M.; Li, M.; Yang, X. F.; Zou, G. Q.; Lu, D. L.; Duan, X. R. [Southwestern Institute of Physics, Chengdu 610041 (China)

2012-02-15T23:59:59.000Z

146

Tungsten and tungsten alloy powder metallurgy: Powder production and applications excluding lamps. (Latest citations from the US Patent bibliographic file with exemplary claims). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations of selected patents concerning the preparation of metallic and ceramic powders of tungsten and tungsten alloys, including applications of these materials. The hydrogen reduction of tungsten compounds together with alloying element compounds produce forms with characteristics of high density, hardness, wear resistance, high melting points, and abrasiveness. Topics include production of cathodes, heaters, filament wires, electrical contacts, acoustic absorbers, high-density sheets and coatings, hard penetrators, and tungsten carbide and metallized ceramics. (Contains a minimum of 109 citations and includes a subject term index and title list.)

Not Available

1994-04-01T23:59:59.000Z

147

Atomistic modeling of diffusion coefficient in fusion reactor first wall material tungsten  

Science Journals Connector (OSTI)

Abstract Tungsten is remarkable for its robustness, especially it has the highest melting point of all the non–alloyed metals. Metallic material tungsten and tungsten alloys have been widely used in aerospace, weapon, nuclear industries and fusion reactor. Tungsten is expected to be the fusion reactor first wall material for this reason. In this paper, self-diffusion coefficients of metallic material tungsten have been investigated via molecular dynamics simulation method using the modified embedded atom potential model. Diffusion activation energy of tungsten can be gotten according to Arrhenius relation between the self-diffusion coefficients simulation results and temperatures. The dipole interaction model is introduced to analyze metallic material tungsten self-diffusion process in a uniform magnetic field. The strong magnetic field increases diffusion activation energy by 34.52% and limits self-diffusion coefficient by 1.15% in 2 T uniform magnetic field.

Zenghui Wang; Kaixuan Zhao; Weiming Chen; Xiaodi Chen; Longyan Zhang

2014-01-01T23:59:59.000Z

148

Synthesis and characterization of reduced tungsten sulfide cluster complexes  

SciTech Connect (OSTI)

Reduction of tungsten(IV) chloride with metals was studied in order to find a high-yield and convenient preparation of {alpha}-tungsten (II) chloride. The reduction of tungsten(IV) chloride with iron metal proved to be the most convenient and reliable synthesis, with a good yield of 60%. The reactions between {alpha}-tungsten(II) chloride and sodium hydrosulfide were investigated. Complete substitution of sulfide for chloride in W{sub 6}Cl{sub 8}{sup 4+} was achieved in the presence of sodium n-butoxide in pyridine solution. Single crystals were grown at elevated temperature (200{degrees}C) in pyridine, and the structure of W{sub 6}S{sub 8}(py){sub 6} was determined by single crystal x-ray techniques. The triethylphosphine (PEt{sub 3}) and tetrahydrothiophene (THT) complexes of W{sub 6}S{sub 8} were established by ligand displacement of pyridine in W{sub 6}S{sub 8}(py){sub 6}. Structures for both W{sub 6}S{sub 8}(PEt{sub 3}){sub 6}. 1.44CH{sub 2}Cl{sub 2} and W{sub 6}S{sub 8}(THT){sub 6} were determined by single crystal x-ray diffraction. These molecular complexes of the W{sub 6}S{sub 8} cluster were also characterized by infrared spectroscopy. 86 refs., 19 figs., 22 tabs.

Zhang, Xiang.

1991-06-27T23:59:59.000Z

149

Development of Bulk Nanocrystalline Cemented Tungsten Carbide for Industrial Applicaitons  

SciTech Connect (OSTI)

This report contains detailed information of the research program entitled "Development of Bulk Nanocrystalline Cemented Tungsten Carbide Materials for Industrial Applications". The report include the processes that were developed for producing nanosized WC/Co composite powders, and an ultrahigh pressure rapid hot consolidation process for sintering of nanosized powders. The mechanical properties of consolidated materials using the nanosized powders are also reported.

Z. Zak Fang, H. Y. Sohn

2009-03-10T23:59:59.000Z

150

Author's personal copy Tungsten in Hawaiian picrites: A compositional model  

E-Print Network [OSTI]

form 15 April 2009; available online 3 May 2009 Abstract Concentrations of tungsten (W) and uranium (U is three-times as enriched as the Depleted MORB Mantle (DMM; 3.0 � 2.3 ng/g). The relatively high of the recycling of W-rich oceanic crust and sediment into a depleted mantle source, such as the depleted MORB

Mcdonough, William F.

151

Tungsten-yttria carbide coating for conveying copper  

DOE Patents [OSTI]

A method is provided for providing a carbided-tungsten-yttria coating on the interior surface of a copper vapor laser. The surface serves as a wick for the condensation of liquid copper to return the condensate to the interior of the laser for revolatilization.

Rothman, Albert J. (Livermore, CA)

1993-01-01T23:59:59.000Z

152

Glass Based on the oxides of Molybdenum, Tungsten and Uranium  

Science Journals Connector (OSTI)

... IN previous publications from this Laboratory, attention has been directed to glasses of unusual composition based on the oxides of tellurium and vanadium1-4. This article ... the oxides of tellurium and vanadium1-4. This article describes the development of further unusual glasses based on the oxides of molybdenum, tungsten and uranium.

P. L. BAYNTON; H. RAWSON; J. E. STANWORTH

1956-10-27T23:59:59.000Z

153

Vertical Arc for ILC Low Emittance Transport  

SciTech Connect (OSTI)

The design and parameters of a vertical arc for the ILC Low Emittance Transport (LET) are reviewed. A 1 TeV CM ILC which relies upon 30 MV/m accelerating cavities with a packing fraction of 65% will require almost 48 km of main linac, which suggests that the total site length including BDS and bunch compressors will be on the order of 53 km. If built in a laser-straight tunnel with the low-energy ends near the surface, and assuming a perfectly spherical ''cue ball'' planetary surface with radius 6370 km, the collider halls will necessarily be 55 meters below grade, as shown in the top plot of Figure 1. Such depths would demand extensive use of deep tunneling, which would potentially drive up the cost and difficulty of ILC construction. An alternate solution is to use discrete vertical arcs at a few locations to allow a ''piecewise straight'' construction in which the depth of the tunnel below grade does not vary by more than a few meters. This approach is shown schematically in the bottom plot of Figure 1. In this Note we consider the issues for a design with one such vertical arc at the 250 GeV/c point (ie, midway down the linac for 1 TeV CM), and a second arc at the entrance to the BDS (ie, the entire BDS lies in one plane, with vertical arcs at each end).

Tenenbaum, P.; Woodley, M.; /SLAC

2005-06-07T23:59:59.000Z

154

Ion source with improved primary arc collimation  

DOE Patents [OSTI]

An improved negative ion source is provided in which a self-biasing, molybdenum collimator is used to define the primary electron stream arc discharge from a filament operated at a negative potential. The collimator is located between the anode and the filament. It is electrically connected to the anode by means of an appropriate size resistor such that the collimator is biased at essentially the filament voltage during operation. Initially, the full arc voltage appears across the filament to collimator until the arc discharge strikes. Then the collimator biases itself to essentially filament potential due to current flow through the resistor thus defining the primary electron stream without intercepting any appreciable arc power. The collimator aperture is slightly smaller than the anode aperture to shield the anode from the arc power which, in the past, has caused overheating and erosion of the anode collimator during extended time pulsed-beam operation of the source. With the self-biasing collimator of this invention, the ion source may be operated from short pulse periods to steady-state without destroying the anode.

Dagenhart, W.K.

1983-12-16T23:59:59.000Z

155

Large-scale purification of single-wall carbon nanotubes prepared by electric arc discharge  

Science Journals Connector (OSTI)

High-yield single-wall carbon nanotubes (SWNTs) have been mass-produced by dc arc discharge evaporation of a carbon electrode including 1 at.% Fe catalyst in hydrogen mixed gas [i.e., H2–inert gas (Ne, Ar, Kr, Xe), or H2–N2]. The as-grown \\{SWNTs\\} have high-crystallinity due to the high temperature of arc plasma, and the coexisting Fe catalyst nanoparticles are embedded in very thin amorphous carbon because of the in situ etching effects of hydrogen. A macroscale purification technique, which is a whole liquid-phase purification process, first reflux treatment in H2O2 solution and then rinsing with hydrochloric acid, has been developed to eliminate the coexisting Fe catalyst nanoparticles and obtain \\{SWNTs\\} with purity higher than 90 at.%.

Xinluo Zhao; Masato Ohkohchi; Sakae Inoue; Tomoko Suzuki; Takenori Kadoya; Yoshinori Ando

2006-01-01T23:59:59.000Z

156

Weldability and weld performance of a special grade Hastelloy-X modified for high-temperature gas-cooled reactors  

SciTech Connect (OSTI)

The characteristics of weld defects in the electron beam (EB) welding and the tungsten inert gas (TIG) arc welding for Hastelloy-XR, a modified version of Hastelloy-X, are clarified through the bead-on-plate test and the Trans-Varestraint test. Based on the results, weldabilities on EB and TIG weldings for Hastelloy-XR are discussed and found to be almost the same as Hastelloy-X. The creep rupture behaviors of the welded joints are evaluated by employing data on creep properties of the base and the weld metals. According to the evaluation, the creep rupture strength of the EB-welded joint may be superior to that of the TIG-welded joint. The corrosion test in helium containing certain impurities is conducted for the weld metals. There is no significant difference of such corrosion characteristics as weight gain, internal oxidation, depleted zone, and so on between the base and the weld metals. Those are superior to Hastelloy-X.

Shimizu, S.; Mutoh, Y.

1984-07-01T23:59:59.000Z

157

Effect of cerium ions in an arc peripheral plasma on the growth of radial single-walled carbon nanotubes  

SciTech Connect (OSTI)

Radial single-walled carbon nanotubes (radial SWCNTs) are formed by using a direct current (dc) arc discharge when carbon and metal atoms are mixed in a gas phase after the vaporization and cooled together in a liquid droplet. Since SWCNTs sprout through the precipitation of saturated carbon atoms from liquid droplets during cooling, a mass synthesis of radial SWCNTs can be achieved when a large number of liquid droplets are generated. In order to understand the effects of arc peripheral plasma parameters (electrons, ions, radical atoms, and molecules) on the growth of radial SWCNTs, the optimum production efficiency of radial SWCNTs is investigated by superimposing a radio-frequency (rf) plasma on the thermal arc plasma and controlling the arc peripheral plasma density. Two parameters--the rf power and the dc potential--of the rf electrode, which is equipped above 20 mm from the center of an arc-discharge point, are changed with the constant He pressure (200 Torr), dc arc current (75 A), and power (2000 W). The production yield of radial SWCNTs is found to be enhanced under the condition of the rf power of 100 W and the dc component of the rf electrode voltage of -22 V, revealing that the optimum ion flux and ion bombardment energy are important key parameters for the formation of radial SWCNTs.

Sato, Y.; Motomiya, K.; Jeyadevan, B.; Tohji, K.; Sato, G.; Ishida, H.; Hirata, T.; Hatakeyama, R. [Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579 (Japan); Department of Electronic Engineering, Tohoku University, Sendai 980-8579 (Japan)

2005-11-01T23:59:59.000Z

158

Ion source based on the cathodic arc  

DOE Patents [OSTI]

A cylindrically symmetric arc source to produce a ring of ions which leave the surface of the arc target radially and are reflected by electrostatic fields present in the source to a point of use, such as a part to be coated, is described. An array of electrically isolated rings positioned in the source serves the dual purpose of minimizing bouncing of macroparticles and providing electrical insulation to maximize the electric field gradients within the source. The source also includes a series of baffles which function as a filtering or trapping mechanism for any macroparticles. 3 figures.

Sanders, D.M.; Falabella, S.

1994-02-01T23:59:59.000Z

159

Ion source based on the cathodic arc  

DOE Patents [OSTI]

A cylindrically symmetric arc source to produce a ring of ions which leave the surface of the arc target radially and are reflected by electrostatic fields present in the source to a point of use, such as a part to be coated. An array of electrically isolated rings positioned in the source serves the dual purpose of minimizing bouncing of macroparticles and providing electrical insulation to maximize the electric field gradients within the source. The source also includes a series of baffles which function as a filtering or trapping mechanism for any macroparticles.

Sanders, David M. (Livermore, CA); Falabella, Steven (Livermore, CA)

1994-01-01T23:59:59.000Z

160

CONTROL OF AN ARC DISCHARGE BY MEANS OF A GRID  

Science Journals Connector (OSTI)

CONTROL OF AN ARC DISCHARGE BY MEANS OF A GRID Albert...Research Laboratory, General Electric Co., Schenectady , N. Y. CONTROL OF AN ARC DISCHARGE BY MEANS OF A GRID. | Research Laboratory, General Electric Co., Schenectady , N...

Albert W. Hull; Irving Langmuir

1929-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Fluorination of Arc-Produced Carbon Material Containing Multiwall Nanotubes  

Science Journals Connector (OSTI)

In this work we studied the fluorination process of MWNTs produced in an electric arc. ... Carbon material was synthesized by using a setup for arc-discharge graphite evaporation described elsewhere. ...

Nicolai F. Yudanov; Alexander V. Okotrub; Yuri V. Shubin; Lyudmila I. Yudanova; Lyubov G. Bulusheva; Andrew L. Chuvilin; Jean-Marc Bonard

2002-03-21T23:59:59.000Z

162

Type B Accident Investigation of the Savannah River Site Arc...  

Broader source: Energy.gov (indexed) [DOE]

the Savannah River Site Arc Flash Burn Injury on September 23, 2009, in the D Area Powerhouse Type B Accident Investigation of the Savannah River Site Arc Flash Burn Injury on...

163

Measurement of the temperature of a pulsating electric arc discharge  

Science Journals Connector (OSTI)

A simple method for determining the temperature on the axis of an oscillating arc column is proposed.

A. Marotta

1994-06-01T23:59:59.000Z

164

Achievement Rewards for College Scientists ARCS Foundation, Inc.  

E-Print Network [OSTI]

Achievement Rewards for College Scientists ARCS Foundation, Inc. Biomedical and Health Sciences the Atlanta chapter of the ARCS Foundation, Inc. funds eight scholarships for exceptional University.S. citizenship. · GPA of 3.5 or above. · Available to attend the ARCS Foundation Awards Luncheon in Atlanta

Arnold, Jonathan

165

Way to reduce arc voltage losses in hybrid thermionic converters  

SciTech Connect (OSTI)

Experimental results are reported concerning the output and emission characteristics of the arc and hybrid regimes in a plane-parallel thermionic converter with Pt--Zr--O electrode pair. It is shown that arc voltage losses can be reduced to values below those obtainable in ordinary arc thermionic converters.

Tskhakaya, V.K.; Yarygin, V.I.

1982-03-01T23:59:59.000Z

166

Solid-state sintering of tungsten heavy alloys  

SciTech Connect (OSTI)

Solid-state sintering is a technologically important step in the fabrication of tungsten heavy alloys. This work addresses practical variables affecting the sinterability: powder particle size, powder mixing, and sintering temperature and time. Compositions containing 1 to 10 micrometer ({mu}M) tungsten (W) powders can be fully densified at temperatures near the matrix solidus. Blending with an intensifier bar provided good dispersion of elemental powders and good as-sintered mechanical properties under adequate sintering conditions. Additional ball milling increases powder bulk density which primarily benefits mold and die filling. Although fine, 1 {mu}m W powder blends have high sinterability, higher as-sintered ductilities are reached in shorter sintering times with coarser, 5 {mu}m W powder blends; 10{mu}m W powder blends promise the highest as-sintered ductilities due to their coarse microstructural W.

Gurwell, W.E.

1994-10-01T23:59:59.000Z

167

Concentration-Dependent Kohn Effect in Cubic Tungsten Bronzes  

Science Journals Connector (OSTI)

Inelastic neutron scattering measurements on single crystals of cubic NaxWO3 reveal a large concentration-dependent Kohn anomaly in the [100] longitudinal acoustic-phonon dispersion curve. The results demonstrate the two-dimensional character of the Fermi surface, support the rigid-band model for 0.56tungsten bronzes.

W. A. Kamitakahara, B. N. Harmon, J. G. Taylor, L. Kopp, H. R. Shanks, and J. Rath

1976-06-07T23:59:59.000Z

168

Scale-up analysis and development of gliding arc discharge facility for volatile organic compounds decomposition  

Science Journals Connector (OSTI)

The influences of inlet gas flow rate and reactor configuration on volatile organic compounds (VOCs) decomposition efficiency in a traditional gliding arc (T-GA) facility are studied based on laboratory experiments and numerical simulation. The ratio of the nozzle diameter and the shortest distance of two electrodes should be maintained in a suitable value range to guarantee the decomposition efficiency, which indicates simply enlarging the nozzle inner diameter is not a proper way to raise the T-GA treatment capacity in a fixed supply voltage condition. A developed gliding arc gas discharge (D-GA) reactor based on a modified gas feed system is proposed: small flow rate air goes through the bottom nozzle to process the GA evolution, and high flow rate contaminated gas goes frontal through the plasma region and decomposes. The performances of D-GA reactor in the decomposition of \\{VOCs\\} with relative high gas flow rate, including decomposition efficiency and specific energy consumption, are better than T-GA reactor. D-GA reactor also avoids the drawbacks of the increases of power system amount and electric power consumption in multi-electrode GA system.

Zheng Bo; Jianhua Yan; Xiaodong Li; Yong Chi; Kefa Cen

2008-01-01T23:59:59.000Z

169

Synthesis, characterization, and structure of reduced tungsten chalcogenide cluster complexes  

SciTech Connect (OSTI)

Over the previous twenty years, ternary molybdenum chalcogenides of the general formula M{sub x}Mo{sub 6}Y{sub 8} (M = ternary metal cation; Y = chalcogenide), known as Chevrel phases, have been extensively studied. Many of these compounds have been found to have superconductivity, catalytic activity and ionic conductivity. The rich chemistry of the Chevrel phases raises considerable interest in finding the tungsten analogues of these phases. However, no such analogue has ever been synthesized, although the Chevrel phases are usually prepared directly from elements at high temperatures above 1000{degrees}C. The absence of the tungsten analogues may be caused by their thermodynamic instability at such high temperatures. Thus it might be necessary to avoid high-temperature synthetic procedures in order to establish the ternary and binary tungsten chalcogenides. A major focus of the McCarley research group has been on the preparation of M{sub 6}Y{sub 8}L{sub 6} (M = Mo, W; Y = S, Se, Te) cluster complexes as low temperature pathways to the Chevrel phases.

Xiaobing, Xie

1997-02-01T23:59:59.000Z

170

Page 1 of 2 -ARC Cost Transfer Guide v. 06/14/13 ARC SPONSORED PROJECT COST TRANSFER GUIDE  

E-Print Network [OSTI]

Page 1 of 2 - ARC Cost Transfer Guide v. 06/14/13 ARC SPONSORED PROJECT COST TRANSFER GUIDE There are three ways to move expenditures onto, off of, or between Sponsored Projects in ARC: AP Journal Voucher in which the voucher accounting date falls, and they are being moved to or between Sponsored Projects GL

Hone, James

171

Hybrid Arc Cell Studies: Status Report  

SciTech Connect (OSTI)

I report on the status, at the end of FY12, of the studies of an arc cell for a hybrid synchrotron accelerating from 375 GeV/c to 750 GeV/c in momentum. Garren produced a complete lattice that gives a good outline of the structure of a hybrid synchrotron lattice. It is, however, lacking in some details: it does not maintain a constant time of flight, it lacks chromaticity correction, its cell structure is not ideal for removing aberrations from chromaticity correction, and it probably needs more space between magnets. I have begun studying cell structures for the arc cells to optimize the lattice performance and cost. I present some preliminary results for two magnets per half cell. I then discuss difficulties encountered, some preliminary attempts at resolving them, and the future plans for this work.

Berg J. S.

2012-09-28T23:59:59.000Z

172

Cathodic Vacuum Arc Plasma of Thallium  

SciTech Connect (OSTI)

Thallium arc plasma was investigated in a vacuum arc ionsource. As expected from previous consideration of cathode materials inthe Periodic Table of the Elements, thallium plasma shows lead-likebehavior. Its mean ion charge state exceeds 2.0 immediately after arctriggering, reaches the predicted 1.60 and 1.45 after about 100 microsecand 150 microsec, respectively. The most likely ion velocity is initially8000 m/s and decays to 6500 m/s and 6200 m/s after 100 microsec and 150microsec, respectively. Both ion charge states and ion velocities decayfurther towards steady state values, which are not reached within the 300microsec pulses used here. It is argued that the exceptionally high vaporpressure and charge exchange reactions are associated with theestablishment of steady state ion values.

Yushkov, Georgy Yu.; Anders, Andre

2006-10-02T23:59:59.000Z

173

Electrical Safety and Arc Flash Protections  

SciTech Connect (OSTI)

Over the past four years, the Electrical Safety Program at PPPL has evolved in addressing changing regulatory requirements and lessons learned from accident events, particularly in regards to arc flash hazards and implementing NFPA 70E requirements. This presentation will discuss PPPL's approaches to the areas of electrical hazards evaluation, both shock and arc flash; engineered solutions for hazards mitigation such as remote racking of medium voltage breakers, operational changes for hazards avoidance, targeted personnel training and hazard appropriate personal protective equipment. Practical solutions for nominal voltage identification and zero voltage checks for lockout/tagout will also be covered. Finally, we will review the value of a comprehensive electrical drawing program, employee attitudes expressed as a personal safety work ethic, integrated safety management, and sustained management support for continuous safety improvement.

R. Camp

2008-03-04T23:59:59.000Z

174

Delivery quality assurance with ArcCHECK  

SciTech Connect (OSTI)

Radiation therapy requires delivery quality assurance (DQA) to ensure that treatment is accurate and closely follows the plan. We report our experience with the ArcCHECK phantom and investigate its potential optimization for the DQA process. One-hundred seventy DQA plans from 84 patients were studied. Plans were classified into 2 groups: those with the target situated on the diodes of the ArcCHECK (D plans) and those with the target situated at the center (C plans). Gamma pass rates for 8 target sites were examined. The parameters used to analyze the data included 3%/3 mm with the Van Dyk percent difference criteria (VD) on, 3%/3 mm with the VD off, 2%/2 mm with the VD on, and x/3 mm with the VD on and the percentage dosimetric agreement “x” for diode plans adjusted. D plans typically displayed maximum planned dose (MPD) on the cylindrical surface containing ArcCHECK diodes than center plans, resulting in inflated gamma pass rates. When this was taken into account by adjusting the percentage dosimetric agreement, C plans outperformed D plans by an average of 3.5%. ArcCHECK can streamline the DQA process, consuming less time and resources than radiographic films. It is unnecessary to generate 2 DQA plans for each patient; a single center plan will suffice. Six of 8 target sites consistently displayed pass rates well within our acceptance criteria; the lesser performance of head and neck and spinal sites can be attributed to marginally lower doses and increased high gradient of plans.

Neilson, Christopher; Klein, Michael; Barnett, Rob [London Regional Cancer Program, London Health Sciences Centre, London, Ontario (Canada); Yartsev, Slav, E-mail: slav.yartsev@lhsc.on.ca [London Regional Cancer Program, London Health Sciences Centre, London, Ontario (Canada)

2013-04-01T23:59:59.000Z

175

Volumetric modulated arc radiotherapy for esophageal cancer  

SciTech Connect (OSTI)

A treatment planning study was performed to evaluate the performance of volumetric arc modulation with RapidArc (RA) against 3D conformal radiation therapy (3D-CRT) and conventional intensity-modulated radiation therapy (IMRT) techniques for esophageal cancer. Computed tomgraphy scans of 10 patients were included in the study. 3D-CRT, 4-field IMRT, and single-arc and double-arc RA plans were generated with the aim to spare organs at risk (OAR) and healthy tissue while enforcing highly conformal target coverage. The planning objective was to deliver 54 Gy to the planning target volume (PTV) in 30 fractions. Plans were evaluated based on target conformity and dose-volume histograms of organs at risk (lung, spinal cord, and heart). The monitor unit (MU) and treatment delivery time were also evaluated to measure the treatment efficiency. The IMRT plan improves target conformity and spares OAR when compared with 3D-CRT. Target conformity improved with RA plans compared with IMRT. The mean lung dose was similar in all techniques. However, RA plans showed a reduction in the volume of the lung irradiated at V{sub 20Gy} and V{sub 30Gy} dose levels (range, 4.62-17.98%) compared with IMRT plans. The mean dose and D{sub 35%} of heart for the RA plans were better than the IMRT by 0.5-5.8%. Mean V{sub 10Gy} and integral dose to healthy tissue were almost similar in all techniques. But RA plans resulted in a reduced low-level dose bath (15-20 Gy) in the range of 14-16% compared with IMRT plans. The average MU needed to deliver the prescribed dose by RA technique was reduced by 20-25% compared with IMRT technique. The preliminary study on RA for esophageal cancers showed improvements in sparing OAR and healthy tissue with reduced beam-on time, whereas only double-arc RA offered improved target coverage compared with IMRT and 3D-CRT plans.

Vivekanandan, Nagarajan, E-mail: viveknaren@hotmail.com [Department of Medical Physics, Cancer Institute, Chennai (India); Sriram, Padmanaban; Syam Kumar, S.A.; Bhuvaneswari, Narayanan; Saranya, Kamalakannan [Department of Medical Physics, Cancer Institute, Chennai (India)

2012-04-01T23:59:59.000Z

176

Conductive Polypyrrole/Tungsten Oxide Metacomposites with Negative Permittivity Jiahua Zhu,  

E-Print Network [OSTI]

) nanocomposites reinforced with tungsten oxide (WO3) nanoparticles (NPs) and nanorods (NRs) are fabricatedConductive Polypyrrole/Tungsten Oxide Metacomposites with Negative Permittivity Jiahua Zhu, Suying techniques to form PNCs. Therefore, synthesis techniques have been developed and optimized to incorporate

Guo, John Zhanhu

177

Dynamics of femtosecond laser produced tungsten nanoparticle plumes S. S. Harilal,1  

E-Print Network [OSTI]

Dynamics of femtosecond laser produced tungsten nanoparticle plumes S. S. Harilal,1 N. Farid,1,2 A tungsten nanoparticle plumes in vacuum. Fast gated images showed distinct two components expansion features for a cost effective way for various applica- tions. Typical synthesis methods for nanoparticles are liquid

Harilal, S. S.

178

The Activation Energy of the para-Hydrogen Conversion on Tungsten  

Science Journals Connector (OSTI)

...research-article The Activation Energy of the para-Hydrogen Conversion on Tungsten A. Couper D. D. Eley...has been made of the activation energy, E, and frequency factor, B , for the conversion of para-hydrogen on tungsten...

1952-01-01T23:59:59.000Z

179

Hydrogen interaction with point defects in tungsten K. Heinola, T. Ahlgren, K. Nordlund, and J. Keinonen  

E-Print Network [OSTI]

Hydrogen interaction with point defects in tungsten K. Heinola, T. Ahlgren, K. Nordlund, and J-principles calculations were used in determining the binding and trapping properties of hydrogen to point defects in tungsten. Hydrogen zero-point vibrations were taken into account. It was concluded that the monovacancy can

Nordlund, Kai

180

Nanostructured tungsten carbide catalysts for polymer electrolyte fuel cells X. G. Yanga  

E-Print Network [OSTI]

a possibility of replacing precious metal anode catalysts with transition metal compounds for hydrogen oxidation density of states of tungsten carbides resembles that of noble metal platinum.4,5 FundamentalNanostructured tungsten carbide catalysts for polymer electrolyte fuel cells X. G. Yanga and C. Y

Note: This page contains sample records for the topic "gas tungsten arc" 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

Heat of combustion of tantalum-tungsten oxide thermite composites  

SciTech Connect (OSTI)

The heat of combustion of two distinctly synthesized stoichiometric tantalum-tungsten oxide energetic composites was investigated by bomb calorimetry. One composite was synthesized using a sol-gel (SG) derived method in which micrometric-scale tantalum is immobilized in a tungsten oxide three-dimensional nanostructured network structure. The second energetic composite was made from the mixing of micrometric-scale tantalum and commercially available (CA) nanometric tungsten oxide powders. The energetic composites were consolidated using the spark plasma sintering (SPS) technique under a 300 MPa pressure and at temperatures of 25, 400, and 500 C. For samples consolidated at 25 C, the density of the CA composite is 61.65 {+-} 1.07% in comparison to 56.41 {+-} 1.19% for the SG derived composite. In contrast, the resulting densities of the SG composite are higher than the CA composite for samples consolidated at 400 and 500 C. The theoretical maximum density for the SG composite consolidated to 400 and 500 C are 81.30 {+-} 0.58% and 84.42 {+-} 0.62%, respectively. The theoretical maximum density of the CA composite consolidated to 400 and 500 C are 74.54 {+-} 0.80% and 77.90 {+-} 0.79%, respectively. X-ray diffraction analyses showed an increase of pre-reaction of the constituents with an increase in the consolidation temperature. The increase in pre-reaction results in lower stored energy content for samples consolidated to 400 and 500 C in comparison to samples consolidated at 25 C. (author)

Cervantes, Octavio G. [Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory (United States); Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616 (United States); Kuntz, Joshua D.; Gash, Alexander E. [Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory (United States); Munir, Zuhair A. [Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616 (United States)

2010-12-15T23:59:59.000Z

182

Dynamics of femtosecond laser produced tungsten nanoparticle plumes  

SciTech Connect (OSTI)

We investigated the expansion features of femtosecond laser generated tungsten nanoparticle plumes in vacuum. Fast gated images showed distinct two components expansion features, viz., plasma and nanoparticle plumes, separated by time of appearance. The persistence of plasma and nanoparticle plumes are ?500 ns and ?100 ?s, respectively, and propagating with velocities differed by 25 times. The estimated temperature of the nanoparticles showed a decreasing trend with increasing time and space. Compared to low-Z materials (e.g., Si), ultrafast laser ablation of high-Z materials like W provides significantly higher nanoparticle yield. A comparison between the nanoparticle plumes generated by W and Si is also discussed along with other metals.

Harilal, S. S.; Hassanein, A. [Center for Materials Under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)] [Center for Materials Under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Farid, N. [Center for Materials Under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States) [Center for Materials Under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); School of Physics and Optical Engineering, Dalian University of Technology, Dalian 116024 (China); Kozhevin, V. M. [Ioffe Physics Technical Institute, Russian Academy of Sciences, St. Petersburg 194021 (Russian Federation)] [Ioffe Physics Technical Institute, Russian Academy of Sciences, St. Petersburg 194021 (Russian Federation)

2013-11-28T23:59:59.000Z

183

Electronic and structural properties of ultrathin tungsten nanowires and nanotubes by density functional theory calculation  

SciTech Connect (OSTI)

The simulated annealing basin-hopping method incorporating the penalty function was used to predict the lowest-energy structures for ultrathin tungsten nanowires and nanotubes of different sizes. These predicted structures indicate that tungsten one-dimensional structures at this small scale do not possess B.C.C. configuration as in bulk tungsten material. In order to analyze the relationship between multi-shell geometries and electronic transfer, the electronic and structural properties of tungsten wires and tubes including partial density of state and band structures which were determined and analyzed by quantum chemistry calculations. In addition, in order to understand the application feasibility of these nanowires and tubes on nano-devices such as field emitters or chemical catalysts, the electronic stability of these ultrathin tungsten nanowires was also investigated by density functional theory calculations.

Sun, Shih-Jye [Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan (China); Lin, Ken-Huang; Li, Jia-Yun [Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Ju, Shin-Pon, E-mail: jushin-pon@mail.nsysu.edu.tw [Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan (China)

2014-10-07T23:59:59.000Z

184

Electrochemistry of chemical vapor deposited tungsten films with relevance to chemical mechanical polishing  

SciTech Connect (OSTI)

The electrochemical behavior of chemically vapor deposited tungsten films in solutions of interest to tungsten chemical mechanical polishing has been investigated using dc potentiodynamic polarization, linear polarization, and Tafel methods. It was found that in the absence of an oxidizer, the tungsten surface was passivated most effectively at acidic pH values. At pH 2 or 4, a WO{sub 2}/WO{sub 3} duplex oxide layer of less than 50 A thickness was detected over the tungsten layer by X-ray photoelectron spectroscopy. The oxide layer formed at pH 2 was much thicker, and had better passivity compared to the oxide formed at pH 4. Addition of H{sub 2}O{sub 2} at pH 2 or 4 resulted in a dramatic increase in tungsten dissolution.

Kneer, E.A.; Raghunath, C.; Raghavan, S. [Univ. of Arizona, Tucson, AZ (United States). Dept. of Materials Science and Engineering; Jeon, J.S. [Advanced Micro Devices Inc., Sunnyvale, CA (United States)

1996-12-01T23:59:59.000Z

185

Arc Flash Boundary Calculations Using Computer Software Tools  

SciTech Connect (OSTI)

Arc Flash Protection boundary calculations have become easier to perform with the availability of personal computer software. These programs incorporate arc flash protection boundary formulas for different voltage and current levels, calculate the bolted fault current at each bus, and use built in time-current coordination curves to determine the clearing time of protective devices in the system. Results of the arc flash protection boundary calculations can be presented in several different forms--as an annotation to the one-line diagram, as a table of arc flash protection boundary distances, and as printed placards to be attached to the appropriate equipment. Basic arc flash protection boundary principles are presented in this paper along with several helpful suggestions for performing arc flash protection boundary calculations.

Gibbs, M.D.

2005-01-07T23:59:59.000Z

186

Physics of arcing, and implications to sputter deposition  

SciTech Connect (OSTI)

Arcing is a well-known, unwanted discharge regime observed on the surface of sputtering targets. The discharge voltage breaks down to less than 50 V while the current jumps to elevated levels. Arcing is unwanted because it prevents uniform deposition and creates particulates. The issue of arcing has been dealt with by target surface conditioning and by using modern power supplies that have arc suppression incorporated. With increasing quality requirements in terms of uniformity of coatings, and absence of particulates, especially for electrochromic and other advanced coatings applications, the issue of arcing warrants a closer examination with the goal to find other, physics-based, and hopefully better approaches of arcing prevention. From a physics point of view, the onset of arcing is nothing else than the transition of the discharge to a cathodic arc mode, which is characterized by the ignition of non-stationary arc spots. Arc spots operate by a sequence of microexplosions, enabling explosive electron emission, as opposed to secondary electron emission. Arc spots and their fragments have a size distribution in the micrometer and sub-micrometer range, and a characteristic time distribution that has components shorter than microseconds. Understanding the ignition conditions of arc spots are of central physical interest. Spot ignition is associated with electric field enhancement, which can be of geometric nature (roughness,particles), or chemical nature (e.g. oxide formation) and related local accumulation of surface charge. Therefore, it is clear that these issues are of particular concern when operating with high-density plasmas, such as in high-power pulsed sputtering, and when using reactive sputter gases.

Anders, Andre

2003-12-15T23:59:59.000Z

187

Tungsten and tungsten-alloy powder metallurgy: Powder production and applications-excluding lamps. November 1971-July 1989 (Citations from the US Patent data base). Report for November 1971-July 1989  

SciTech Connect (OSTI)

This bibliography contains citations of selected patents concerning the preparation of metallic and ceramic powders of tungsten and tungsten alloys including various applications of these materials. The hydrogen reduction of tungsten compounds together with alloying-element compounds produce forms with characteristics of high density, hardness, wear resistance, high melting points, and abrasiveness. Topics include production of various cathodes, heaters, filament wires, electrical contacts, acoustic absorbers, high-density sheets and coatings, hard penetrators, and tungsten carbide and metallized ceramics. Tungsten halogen lamps are examined in a separate bibliography. (Contains 60 citations fully indexed and including a title list.)

Not Available

1989-10-01T23:59:59.000Z

188

Influence of argon and oxygen on charge-state-resolved ion energy distributions of filtered aluminum arcs  

E-Print Network [OSTI]

energy distributions of filtered aluminum arcs Johanna Roséndistributions (IEDs) in filtered aluminum vacuum arc plasmasfor vacuum arc plasmas. Aluminum plasma, for example,

Rosen, Johanna; Anders, Andre; Mraz, Stanislav; Atiser, Adil; Schneider, Jochen M.

2006-01-01T23:59:59.000Z

189

A Miocene Island-Arc Volcanic Seamount- The Takashibiyama Formation...  

Open Energy Info (EERE)

Island-Arc Volcanic Seamount- The Takashibiyama Formation, Shimane Peninsula, Sw Japan Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: A...

190

A New Survey for Giant Arcs  

SciTech Connect (OSTI)

We report on the first results of an imaging survey to detect strong gravitational lensing targeting the richest clusters selected from the photometric data of the Sloan Digital Sky Survey (SDSS) with follow-up deep imaging observations from the Wisconsin Indiana Yale NOAO (WIYN) 3.5m telescope and the University of Hawaii 88-inch telescope (UH88). The clusters are selected from an area of 8000 deg{sup 2} using the Red Cluster Sequence technique and span the redshift range 0.1 {approx}< z {approx}< 0.6, corresponding to a comoving cosmological volume of {approx} 2Gpc{sup 3}. Our imaging survey thus targets a volume more than an order of magnitude larger than any previous search. A total of 240 clusters were imaged of which 141 had sub-arcsecond image quality. Our survey has uncovered 16 new lensing clusters with definite giant arcs, an additional 12 systems for which the lensing interpretation is very likely, and 9 possible lenses which contain shorter arclets or candidate arcs which are less certain and will require further observations to confirm their lensing origin. The number of new cluster lenses detected in this survey is likely > 30. Among these new systems are several of the most dramatic examples of strong gravitational lensing ever discovered with multiple bright arcs at large angular separation. These will likely become 'poster-child' gravitational lenses similar to Abell 1689 and CL0024+1654. The new lenses discovered in this survey will enable future systematic studies of the statistics of strong lensing and its implications for cosmology and our structure formation paradigm.

Hennawi, Joseph F.; Gladders, Michael D.; Oguri, Masamune; Dalal, Neal; Koester, Benjamin; Natarajan, Priyamvada; Strauss, Michael A.; Inada, Naohisa; Kayo, Issha; Lin,; Lampeitl, Hubert; Annis, James; Bahcall, Neta A.; Schneider, Donald P.

2006-11-15T23:59:59.000Z

191

Physical characteristics of gliding arc discharge plasma generated in a laval nozzle  

SciTech Connect (OSTI)

The dynamic behavior of gliding arc discharge generated in a Laval nozzle has been investigated by electrical diagnostics and a high-speed camera. The results show that the voltage waveform keeps the initial shape as the gas flow rate is small, while it becomes less stable with increasing flow rate. During the first half of a cycle, the voltage rises and after that it decreases. In nitrogen and oxygen, the break down voltage for the arc is between 3.3 and 5.5 kV, while it is between 3.3-7.5 kV in air. The waveform of current I remains almost stable; and for nitrogen and oxygen, the maximum value of current I is between 0.28 and 0.46 A. With increasing flow rate, the power consumption in air first increases and then decreases; it remains in the range of 110-217 W, and gradually increases in nitrogen and oxygen. The power consumption in oxygen is lower than that in nitrogen; the input of the energy density decreases with increasing flow rate for all the three gases. The development of the arc is tracked and recorded by a high-speed camera. The cycle is stable at 10 ms for flow rates up to 1 m{sup 3} h{sup -1}. At a higher flow rate, the cycle becomes unstable.

Lu, S. Y.; Sun, X. M.; Li, X. D.; Yan, J. H. [State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027 (China); Du, C. M. [School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275 (China)

2012-07-15T23:59:59.000Z

192

Optimization of the output and efficiency of a high power cascaded arc hydrogen plasma source  

SciTech Connect (OSTI)

The operation of a cascaded arc hydrogen plasma source was experimentally investigated to provide an empirical basis for the scaling of this source to higher plasma fluxes and efficiencies. The flux and efficiency were determined as a function of the input power, discharge channel diameter, and hydrogen gas flow rate. Measurements of the pressure in the arc channel show that the flow is well described by Poiseuille flow and that the effective heavy particle temperature is approximately 0.8 eV. Interpretation of the measured I-V data in terms of a one-parameter model shows that the plasma production is proportional to the input power, to the square root of the hydrogen flow rate, and is independent of the channel diameter. The observed scaling shows that the dominant power loss mechanism inside the arc channel is one that scales with the effective volume of the plasma in the discharge channel. Measurements on the plasma output with Thomson scattering confirm the linear dependence of the plasma production on the input power. Extrapolation of these results shows that (without a magnetic field) an improvement in the plasma production by a factor of 10 over where it was in van Rooij et al. [Appl. Phys. Lett. 90, 121501 (2007)] should be possible.

Vijvers, W. A. J.; Gils, C. A. J. van; Goedheer, W. J.; Meiden, H. J. van der; Veremiyenko, V. P.; Westerhout, J.; Lopes Cardozo, N. J.; Rooij, G. J. van [FOM-Institute for Plasma Physics Rijnhuizen, Association EURATOM-FOM, Trilateral Euregio Cluster, P.O. Box 1207, 3430 BE Nieuwegein (Netherlands); Schram, D. C. [Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)

2008-09-15T23:59:59.000Z

193

The effect of phosphorus on the formation of tungsten dioxide: A novel morphology  

SciTech Connect (OSTI)

The industrial production of tungsten is based on the hydrogen reduction of tungsten oxides, ammonium paratungstate (APT) or ammonium tungsten oxide bronze (ATOB). Hydrogen reduction is applied when high purity tungsten is required and when the addition of other elements or compounds (dopants) is desired for modification of the properties of the metal powder. The first stage of the reduction is finished when WO{sub 2} is formed and it seems that the efficient incorporation of the additives starts mainly at this reduction step. The study reported here was undertaken to investigate the effect of phosphorus dope on the morphology of the intermediate tungsten dioxide and analyze its influence on the grain size of the final tungsten metal powder. The authors observed star shaped morphology of WO{sub 2}, a structure which has not been describe in the literature. Contrary to the well-known cauliflower shaped tungsten dioxide, these starlets are not pseudomorphic to the initial ATOB particles; they grow separately and have a great influence on the grain size of the final metal powder.

Hegedus, E.; Neugebauer, J. [Hungarian Academy of Sciences, Budapest (Hungary). Research Inst. for Technical Physics and Materials Science] [Hungarian Academy of Sciences, Budapest (Hungary). Research Inst. for Technical Physics and Materials Science

1999-02-19T23:59:59.000Z

194

E-Print Network 3.0 - arc magmatism isotopic Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

& Nakamura (1993) Nature 370 e.g. Izu arc: Ishikawa & Nakamura (1993) Nature 370 Boron isotopes help... --Th isotopes in arc magmasTh isotopes in arc magmas For equilibrium:...

195

E-Print Network 3.0 - arc northwesternmost california Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

365 ARC JIW Engineering Design Requirements (4... 201 2. ARC 203 2. ARC 204 (studio) 3. PHY 103 3. PHY ... Source: Bou-Zeid, Elie - Department of Civil and Environmental...

196

E-Print Network 3.0 - arc detector system Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

by hand later) Summary: . The spatial resolution is approximately 1 arc sec in the E-W direction and 2 arc sec along the slit (N... ,0) (3,0) (0,910) Slit n ? (arc sec 2 ) ...

197

E-Print Network 3.0 - assisted non-consumable arc Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sample search results for: assisted non-consumable arc Page: << < 1 2 3 4 5 > >> 1 GIS by ESRITM What is ArcGIS Summary: GIS by ESRITM What is ArcGIS TM ? 12;Copyright ...

198

E-Print Network 3.0 - arc dynamic behavior Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Sample search results for: arc dynamic behavior Page: << < 1 2 3 4 5 > >> 1 GIS by ESRITM What is ArcGIS Summary: and events Dynamic segmentation Importing ArcView GIS...

199

Greenhouse Gas Reductions: SF6  

ScienceCinema (OSTI)

Argonne National Laboratory is leading the way in greenhouse gas reductions, particularly with the recapture and recycling of sulfur hexafluoride (SF6). SF6 is a gas used in industry as an anti-arcing agent. It is an extremely potent greenhouse gas ? one pound of SF6 is equivalent to 12 tons of carbon dioxide. While the U.S. does not currently regulate SF6 emissions, Argonne is proactively and voluntarily recovering and recycling to reduce SF6 emissions. Argonne saves over 16,000 tons of SF6 from being emitted into the atmosphere each year, and by recycling the gas rather than purchasing it new, we save taxpayers over $208,000 each year.

Anderson, Diana

2013-04-19T23:59:59.000Z

200

Greenhouse Gas Reductions: SF6  

SciTech Connect (OSTI)

Argonne National Laboratory is leading the way in greenhouse gas reductions, particularly with the recapture and recycling of sulfur hexafluoride (SF6). SF6 is a gas used in industry as an anti-arcing agent. It is an extremely potent greenhouse gas — one pound of SF6 is equivalent to 12 tons of carbon dioxide. While the U.S. does not currently regulate SF6 emissions, Argonne is proactively and voluntarily recovering and recycling to reduce SF6 emissions. Argonne saves over 16,000 tons of SF6 from being emitted into the atmosphere each year, and by recycling the gas rather than purchasing it new, we save taxpayers over $208,000 each year.

Anderson, Diana

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Tunable carbon nanotube-tungsten carbide nanoparticles heterostructures by vapor deposition  

SciTech Connect (OSTI)

A simple, versatile route for the synthesis of carbon nanotube (CNT)-tungsten carbide nanoparticles heterostructures was set up via vapor deposition process. For the first time, amorphous CNTs (?-CNTs) were used to immobilized tungsten carbide nanoparticles. By adjusting the synthesis and annealing temperature, ?-CNTs/amorphous tungsten carbide, ?-CNTs/W{sub 2}C, and CNTs/W{sub 2}C/WC heterostructures were prepared. This approach provides an efficient method to attach other metal carbides and other nanoparticles to carbon nanotubes with tunable properties.

Xia, Min; Guo, Hongyan; Ge, Changchun [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing (China); Institute of Powder Metallurgy and Advanced Ceramics, Southwest Jiaotong University, 111, 1st Section, Northern 2nd Ring Road, Chengdu (China); Yan, Qingzhi, E-mail: qzyan@ustb.edu.cn; Lang, Shaoting [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing (China)

2014-05-14T23:59:59.000Z

202

Arc Geometry and Algebra: Foliations, Moduli Spaces, String ...  

E-Print Network [OSTI]

exhaustive if wti(?) = 0 for all i. We set Arcs g(r ?1) ? As g,r and DArcs g(r ?1) ? Ds g,r to be the subsets of exhaustive elements. We furthermore set Arc(n) = ?g,

2012-05-02T23:59:59.000Z

203

Connecting ARC/INFO and SNACTor Project Report  

E-Print Network [OSTI]

Connecting ARC/INFO and SNACTor Project Report June 1991 Stuart C. Shapiro, Hans Chalupsky;Connecting ARC/INFO* and SNACTor --- Project Report1 Stuart C. Shapiro2 , Hans Chalupsky2 and Hsueh and reasoning system developed by Stuart C. Shapiro et al. at the State University of New York at Buffalo

California at Santa Barbara, University of

204

Mechanism of carbon nanostructure synthesis in arc plasma  

SciTech Connect (OSTI)

Plasma enhanced techniques are widely used for synthesis of carbon nanostructures. The primary focus of this paper is to summarize recent experimental and theoretical advances in understanding of single-wall carbon nanotube (SWNT) synthesis mechanism in arcs, and to describe methods of controlling arc plasma parameters. Fundamental issues related to synthesis of SWNTs, which is a relationship between plasma parameters and SWNT characteristics are considered. It is shown that characteristics of synthesized SWNTs can be altered by varying plasma parameters. Effects of electrical and magnetic fields applied during SWNT synthesis in arc plasma are explored. Magnetic field has a profound effect on the diameter, chirality, and length of a SWNT synthesized in the arc plasma. An average length of SWNT increases by a factor of 2 in discharge with magnetic field and an amount of long nanotubes with the length above 5 {mu}m also increases in comparison with that observed in the discharge without a magnetic field. In addition, synthesis of a few-layer graphene in a magnetic field presence is discovered. A coupled model of plasma-electrode phenomena in atmospheric-pressure anodic arc in helium is described. Calculations indicate that substantial fraction of the current at the cathode is conducted by ions (0.7-0.9 of the total current). It is shown that nonmonotonic behavior of the arc current-voltage characteristic can be reproduced taking into account the experimentally observed dependence of the arc radius on arc current.

Keidar, M.; Shashurin, A.; Volotskova, O. [George Washington University, Washington, DC 20052 (United States); Raitses, Y. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Beilis, I. I. [Tel Aviv University, Tel Aviv 69978 (Israel)

2010-05-15T23:59:59.000Z

205

Darwin: The Third DOE ARM TWP ARCS Site  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Darwin: The Third DOE ARM TWP ARCS Site Darwin: The Third DOE ARM TWP ARCS Site W. E. Clements and L. Jones Los Alamos National Laboratory, Los Alamos, New Mexico T. Baldwin Special Services Unit Australian Bureau of Meteorology Melbourne, Australia K. Nitschke South Pacific Regional Environment Programme Apia, Samoa Introduction The U.S. Department of Energy's (DOE's) Atmospheric Radiation Measurement (ARM) Program began operations in its Tropical Western Pacific (TWP) locale in October 1996 when the first Atmospheric Radiation and Cloud Station (ARCS) began collecting data on Manus Island in Papua New Guinea (PNG). Two years later, in November 1998 a second ARCS began operations on the island of Nauru in the Central Pacific. Now a third ARCS has begun collecting data in Darwin, Australia. See Figure 1 for

206

Type A Investigation of the Electrical Arc Injury at the Stanford...  

Office of Environmental Management (EM)

of the Electrical Arc Injury at the Stanford Linear Accelerator Complex on October 11, 2004 Type A Investigation of the Electrical Arc Injury at the Stanford Linear Accelerator...

207

E-Print Network 3.0 - area filtered arc Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Electrical and Computer Engineering, University of Kentucky Collection: Engineering 3 GIS by ESRITM What is ArcGIS Summary: and terrainmodelingcapabilities. ArcGIS 3D Analyst...

208

E-Print Network 3.0 - andean arc magmatism Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

arc in central Novaya Zemlya, Arctic Russia... - genian magmatic arc. Zircon and titanite in four samples from Mashigin Fjord and Matochkin Strait yield U... ). The events at...

209

Generation of high charge state metal ion beams by electron cyclotron resonance heating of vacuum arc plasma in cusp trap  

SciTech Connect (OSTI)

A method for generating high charge state heavy metal ion beams based on high power microwave heating of vacuum arc plasma confined in a magnetic trap under electron cyclotron resonance conditions has been developed. A feature of the work described here is the use of a cusp magnetic field with inherent ''minimum-B'' structure as the confinement geometry, as opposed to a simple mirror device as we have reported on previously. The cusp configuration has been successfully used for microwave heating of gas discharge plasma and extraction from the plasma of highly charged, high current, gaseous ion beams. Now we use the trap for heavy metal ion beam generation. Two different approaches were used for injecting the vacuum arc metal plasma into the trap - axial injection from a miniature arc source located on-axis near the microwave window, and radial injection from sources mounted radially at the midplane of the trap. Here, we describe preliminary results of heating vacuum arc plasma in a cusp magnetic trap by pulsed (400 {mu}s) high power (up to 100 kW) microwave radiation at 37.5 GHz for the generation of highly charged heavy metal ion beams.

Nikolaev, A. G.; Savkin, K. P.; Oks, E. M.; Vizir, A. V.; Yushkov, G. Yu. [High Current Electronics Institute, Siberian Division of Russian Academy Science, Tomsk 634055 (Russian Federation); Vodopyanov, A. V.; Izotov, I. V.; Mansfeld, D. A. [Institute of Applied Physics, Russian Academy of Science, Nizhniy Novgorod 603950 (Russian Federation)

2012-02-15T23:59:59.000Z

210

An algorithm to calculate a collapsed arc dose matrix in volumetric modulated arc therapy  

SciTech Connect (OSTI)

Purpose: The delivery of volumetric modulated arc therapy (VMAT) is more complex than other conformal radiotherapy techniques. In this work, the authors present the feasibility of performing routine verification of VMAT delivery using a dose matrix measured by a gantry mounted 2D ion chamber array and corresponding dose matrix calculated by an inhouse developed algorithm.Methods: Pinnacle, v9.0, treatment planning system (TPS) was used in this study to generate VMAT plans for a 6 MV photon beam from an Elekta-Synergy linear accelerator. An algorithm was developed and implemented with inhouse computer code to calculate the dose matrix resulting from a VMAT arc in a plane perpendicular to the beam at isocenter. The algorithm was validated using measurement of standard patterns and clinical VMAT plans with a 2D ion chamber array. The clinical VMAT plans were also validated using ArcCHECK measurements. The measured and calculated dose matrices were compared using gamma ({gamma}) analysis with 3%/3 mm criteria and {gamma} tolerance of 1.Results: The dose matrix comparison of standard patterns has shown excellent agreement with the mean {gamma} pass rate 97.7 ({sigma}= 0.4)%. The validation of clinical VMAT plans using the dose matrix predicted by the algorithm and the corresponding measured dose matrices also showed good agreement with the mean {gamma} pass rate of 97.6 ({sigma}= 1.6)%. The validation of clinical VMAT plans using ArcCHECK measurements showed a mean pass rate of 95.6 ({sigma}= 1.8)%.Conclusions: The developed algorithm was shown to accurately predict the dose matrix, in a plane perpendicular to the beam, by considering all possible leaf trajectories in a VMAT delivery. This enables the verification of VMAT delivery using a 2D array detector mounted on a treatment head.

Arumugam, Sankar; Xing Aitang [Liverpool and Macarthur Cancer Therapy Centres and Ingham Institute, New South Wales 2170 (Australia); Jameson, Michael [Liverpool and Macarthur Cancer Therapy Centres and Ingham Institute, New South Wales 2170 (Australia); Centre for Medical Radiation Physics, University of Wollongong, Wollongong, New South Wales 2522 (Australia); Holloway, Lois [Liverpool and Macarthur Cancer Therapy Centres and Ingham Institute, New South Wales 2170 (Australia); Centre for Medical Radiation Physics, University of Wollongong, Wollongong, New South Wales 2522 (Australia); South West Clinical School, University of New South Wales, Sydney, New South Wales 2052 (Australia); Institute of Medical Physics, School of Physics, University of Sydney, Sydney, New South Wales 2006 (Australia)

2013-07-15T23:59:59.000Z

211

Microsoft Word - Lamellae tungsten tile design thermal and electromagnetic stress analysis_Final.doc  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lamellae tungsten tile design transient Lamellae tungsten tile design transient thermal/ electromagnetic stress analysis Thomas Willard*, Rui Vieira, Samuel Pierson MIT Plasma Science and Fusion Center, Cambridge, MA 02139 8 June 2006 Abstract A transient thermal/ electromagnetic stress analysis of the lamellae tungsten tile design has been performed to determine if the design is adequate to meet the maximum design load conditions of 12 MW/ m 2 uniform heat flux for 5 seconds (single pulse, no Diverter Plate temperature ratcheting) , superimposed on the electromagnetic body load due to eddy currents generated by disruptions. The results show that the design is adequate, with the stresses in the tungsten lamellae and the TZM molybdenum hardware less than the ultimate strength of

212

Tungsten-Titanium as Advanced Material for RF-MEMS Switches  

Science Journals Connector (OSTI)

In this paper we present first results on the development of high temperature stable tungsten-titanium (WTi) based MEMS cantilevers, using conventional sputter ... and wet chemical etching. By synthesizing two WTi

Stefan Klein; Helmut Seidel; Ulrich Schmidt…

2008-01-01T23:59:59.000Z

213

Simulation Studies of Hydrogen Ion reflection from Tungsten for the Surface Production of Negative Hydrogen Ions  

SciTech Connect (OSTI)

The production efficiency of negative ions at tungsten surface by particle reflection has been investigated. Angular distributions and energy spectra of reflected hydrogen ions from tungsten surface are calculated with a Monte Carlo simulation code ACAT. The results obtained with ACAT have indicated that angular distributions of reflected hydrogen ions show narrow distributions for low-energy incidence such as 50 eV, and energy spectra of reflected ions show sharp peaks around 90% of incident energy. These narrow angular distributions and sharp peaks are favorable for the efficient extraction of negative ions from an ion source equipped with tungsten surface as negative ionization converter. The retained hydrogen atoms in tungsten lead to the reduction in extraction efficiency due to boarded angular distributions.

Kenmotsu, Takahiro; Wada, Motoi [Doshisha University, Kyotanabe, Kyoto 610-0394 (Japan)

2011-09-26T23:59:59.000Z

214

Multiphysics Design and Simulation of a Tungsten-Cermet Nuclear Thermal Rocket  

E-Print Network [OSTI]

fuel safety have sparked interest in an NTR core based on tungsten-cermet fuel. This work investigates the capability of modern CFD and neutronics codes to design a cermet NTR, and makes specific recommendations for the configuration of channels...

Appel, Bradley

2012-10-19T23:59:59.000Z

215

Tantalum–tungsten oxide thermite composites prepared by sol–gel synthesis and spark plasma sintering  

Science Journals Connector (OSTI)

Energetic composite powders consisting of sol–gel derived nanostructured tungsten oxide were produced with various amounts of micrometer-scale tantalum fuel metal. Such energetic composite powders were ignition-tested and the results show that the powders are not sensitive to friction, spark and/or impact ignition. Initial consolidation experiments, using the High-Pressure Spark Plasma Sintering (HPSPS) technique, on the sol–gel derived nanostructured tungsten oxide produced samples with higher relative density than can be achieved with commercially available tungsten oxide. The sol–gel derived nanostructured tungsten oxide with immobilized tantalum fuel metal (Ta–WO3) energetic composite was consolidated to a density of 9.17 g cm?3 or 93% relative density. In addition, those samples were consolidated without significant pre-reaction of the constituents, thus retaining their stored chemical energy.

Joshua D. Kuntz; Octavio G. Cervantes; Alexander E. Gash; Zuhair A. Munir

2010-01-01T23:59:59.000Z

216

Electropolymerized Polyaniline Stabilized Tungsten Oxide Nanocomposite Films: Electrochromic Behavior and Electrochemical  

E-Print Network [OSTI]

Electropolymerized Polyaniline Stabilized Tungsten Oxide Nanocomposite Films: Electrochromic. The optical properties and electrochemical capacitive behaviors of the composite films for electrochromic (EC electrochromism at both positive and negative potentials arising from PANI and WO3, respectively. A coloration

Guo, John Zhanhu

217

Method of producing tungsten-titanium sputter targets and targets produced thereby  

SciTech Connect (OSTI)

A method is described for preparing a tungsten-titanium sputter target having substantially no [beta](Ti,W) phase present and exhibiting improvement in reduction of particulate emission upon sputtering, comprising: (a) providing powders of said tungsten and titanium wherein said titanium powder is present in an amount of about 1-20 wt. % based on the total weight of said tungsten and titanium powders provided; (b) compacting said powders at a pressure of from about 200 to 1,000 MPa; and (c) heating said powders at a temperature from about 600-882 C. A method for preparing a tungsten-titanium sputtering target having substantially no [beta](Ti,W) phase present and exhibiting improvement in reduction of particulate emission upon sputtering.

Wickersham, C.E. Jr.; Mueller, J.J.

1993-08-10T23:59:59.000Z

218

E-Print Network 3.0 - alkaline tungsten matrix Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

to be easily resolved (P. Piccoli and B. Stuller). WDS map of tungsten in a titanite (CaTiSiO5) grain from... the Cathedral Peak Granodiorite, Yosemite National Park. The...

219

The National Energy Modeling System: An Overview 2000 - Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

natural gas transmission and distribution module (NGTDM) of NEMS represents the natural gas market and determines regional market-clearing prices for natural gas supplies and for end-use consumption, given the information passed from other NEMS modules. A transmission and distribution network (Figure 15), composed of nodes and arcs, is used to simulate the interregional flow and pricing of gas in the contiguous United States and Canada in both the peak (December through March) and offpeak (April through November) period. This network is a simplified representation of the physical natural gas pipeline system and establishes the possible interregional flows and associated prices as gas moves from supply sources to end users. natural gas transmission and distribution module (NGTDM) of NEMS represents the natural gas market and determines regional market-clearing prices for natural gas supplies and for end-use consumption, given the information passed from other NEMS modules. A transmission and distribution network (Figure 15), composed of nodes and arcs, is used to simulate the interregional flow and pricing of gas in the contiguous United States and Canada in both the peak (December through March) and offpeak (April through November) period. This network is a simplified representation of the physical natural gas pipeline system and establishes the possible interregional flows and associated prices as gas moves from supply sources to end users. Figure 15. Natural Gas Transmission and Distribution Module Network

220

Experimental evidence of chaotic behavior in atmospheric pressure arc discharge  

SciTech Connect (OSTI)

Thermal plasma technology is already playing an important role in the production of new materials, in the destruction of toxic wastes, and in the development of safer and more efficient manufacturing and material processing applications. In free burning as well as in stabilized arc columns, the inherent movement of arc root results in fluctuation in arc voltage. A full knowledge and control over the arc root dynamics can effectively lengthen the life time, drastically improve performance and reliability in arc plasma devices. In this paper, the authors experimentally investigate the fluctuating voltage signals generated from an atmospheric pressure arc discharge produced in a hollow electrode plasma torch. For the first time, analysis of these signals reveal them to exhibit chaotic behavior. The present analysis is supported with real time behavior, phase portraits, power spectra and Lyapunov exponents. Dependence of system behavior on various control parameters is also investigated. This approach is interesting in the sense that it can lead to better understanding of physics for future researches on arc plasma jets and related devices.

Ghorui, S.; Sahasrabudhe, S.N.; Murthy, P.S.S.; Das, A.K.; Venkatramani, N.

2000-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Oxidation and Volatilization from Tungsten Brush High Heat Flux Armor During High Temperature Steam Exposure  

SciTech Connect (OSTI)

Tungsten brush accommodates thermal stresses and high heat flux in fusion reactor components such as plasma facing surfaces or armor. However, inherently higher surface areas are introduced with the brush design. We have tested a specific design of tungsten brush in steam between 500 and 1100°C. Hydrogen generation and tungsten volatilization rates were determined to address fusion safety issues. The brush prepared from 3.2-mm diameter welding rods had a packing density of 85 percent. We found that both hydrogen generation and tungsten volatilization from brush, fixtured to represent a unit within a larger component, were less than projections based upon the total integrated surface area (TSA). Steam access and the escape of hydrogen and volatile oxide from void spaces within the brush are restricted compared to specimens with more direct diffusion pathways to the test environment. Hydrogen generation rates from restrained specimens based on normal surface area (NSA) remain about five times higher than rates based on total surface areas from specimens with direct steam access. Volatilization rates from restrained specimens based upon normal surface area (NSA) were only 50 percent higher than our historic cumulative maximum flux plot (CMFP) for tungsten. This study has shown that hydrogen generation and tungsten volatilization from brush do not scale according to predictions with previously determined rates, but in fact, with higher packing density could approach those from flat surfaces.

Smolik, Galen Richard; Pawelko, Robert James; Anderl, Robert Andrew; Petti, David Andrew

2000-05-01T23:59:59.000Z

222

Arc Energy Estimations: Applications in Lightning-Induced Concrete Spall  

SciTech Connect (OSTI)

After lightning contacts a building, the possibility of a physical break in its conductive path to ground may exist. Given such a break, an electric field may develop across the gap until it exceeds the breakdown strength of the non-conducting, or dielectric, material. Breakdown subsequently occurs and energy is dissipated during the development of an arc channel. If the dielectric is concrete, a concern exists that the energy available for arc formation may be capable of launching pieces of spall into sensitive equipment. This paper discusses the mechanisms of energy dissipation in arc formation and quantifies the energy available for concrete spall.

Tully, L K; Ong, M M

2008-06-03T23:59:59.000Z

223

E-Print Network 3.0 - arc plasma gun Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

gun Search Powered by Explorit Topic List Advanced Search Sample search results for: arc plasma gun...

224

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 methodology to be developed for hazardous gas dispersion connecting Disaster Simulation and Trace with GIS of Gas Dispersion Affected Area Overlaid on Satellite Image (using ArcGIS 9.2) Scenario-based Simulation

Shinozuka, Masanobu

225

FusionArc optimization: A hybrid volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT) planning strategy  

SciTech Connect (OSTI)

Purpose: To introduce a hybrid volumetric modulated arc therapy/intensity modulated radiation therapy (VMAT/IMRT) optimization strategy called FusionArc that combines the delivery efficiency of single-arc VMAT with the potentially desirable intensity modulation possible with IMRT.Methods: A beamlet-based inverse planning system was enhanced to combine the advantages of VMAT and IMRT into one comprehensive technique. In the hybrid strategy, baseline single-arc VMAT plans are optimized and then the current cost function gradients with respect to the beamlets are used to define a metric for predicting which beam angles would benefit from further intensity modulation. Beams with the highest metric values (called the gradient factor) are converted from VMAT apertures to IMRT fluence, and the optimization proceeds with the mixed variable set until convergence or until additional beams are selected for conversion. One phantom and two clinical cases were used to validate the gradient factor and characterize the FusionArc strategy. Comparisons were made between standard IMRT, single-arc VMAT, and FusionArc plans with one to five IMRT/hybrid beams.Results: The gradient factor was found to be highly predictive of the VMAT angles that would benefit plan quality the most from beam modulation. Over the three cases studied, a FusionArc plan with three converted beams achieved superior dosimetric quality with reductions in final cost ranging from 26.4% to 48.1% compared to single-arc VMAT. Additionally, the three beam FusionArc plans required 22.4%-43.7% fewer MU/Gy than a seven beam IMRT plan. While the FusionArc plans with five converted beams offer larger reductions in final cost-32.9%-55.2% compared to single-arc VMAT-the decrease in MU/Gy compared to IMRT was noticeably smaller at 12.2%-18.5%, when compared to IMRT.Conclusions: A hybrid VMAT/IMRT strategy was implemented to find a high quality compromise between gantry-angle and intensity-based degrees of freedom. This optimization method will allow patients to be simultaneously planned for dosimetric quality and delivery efficiency without switching between delivery techniques. Example phantom and clinical cases suggest that the conversion of only three VMAT segments to modulated beams may result in a good combination of quality and efficiency.

Matuszak, Martha M.; McShan, Daniel L.; Ten Haken, Randall K. [Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109 (United States); Steers, Jennifer M. [Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109 and Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109 (United States); Long, Troy; Edwin Romeijn, H. [Department of Industrial and Operations Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States); Fraass, Benedick A. [Department of Radiation Oncology, Cedars-Sinai Medical Center, Los Angeles, California 90048 (United States)

2013-07-15T23:59:59.000Z

226

Fracture Toughness and Strength in a New Class of Bainitic Chromium-Tungsten Steels  

SciTech Connect (OSTI)

This project dealt with developing an understanding of the toughening and stengthening mechanisms for a new class of Fe-3Cr-W(V) steels developed at Oak Ridge National Laboratory (ORNL) in collaboration with Nooter Corporation and other industrial partners. The new steele had 50% higher tensile strength up to 650 degrees Celsius than currently used steels and the potential for not requiring any postweld heat treatment (PWHT) and for reducing equipment weight by 25%. This project was closely related to the Nooter project described in the report Development of a New Class of Fe-3Cr-W(V) Ferritic steels for Industrial Process Applications (ORNL/TM-2005/82). The project was carried out jointly by the University of Pittsburgh and ORNL. The University of Pittsburgh carried out fracture toughness measurements and microstructural analysis on base metal and welded plates prepared at ORNL. The project focused on three areas. The first dealt with detailed microstructural analysis of base compositions of 3Cr-3WV and 3Cr-3WBV(Ta) in both normalized (N) and normalized and tempered (NT) conditions. The second aspect of the prject dealt with determining tensile properties and fracture toughness values of K{subIC} at room temperature for both 3Cr-3Wv and 3Cr-3WV(Ta) compositions. The third focus of the project was to measure the fracture toughness values of the base metal and the heat-affectged zone (HAZ) of a plate of Fe-3Cr-W(Mo)V steel plate welded by the gas tungsten are (GTA) process. The HAZ toughness was measured in both the as-welded and the PWHT condition.

Mao, S. X.; Sikka, V. K.

2006-06-01T23:59:59.000Z

227

DOE Solar Decathlon: News Blog » SCI-Arc/Caltech  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

SCI-Arc/Caltech SCI-Arc/Caltech Below you will find Solar Decathlon news from the SCI-Arc/Caltech archive, sorted by date. CHIP House Takes Design to Different Heights (Literally) Friday, May 13, 2011 By April Saylor Editor's Note: This entry has been cross-posted from DOE's Energy Blog. In honor of the U.S. Department of Energy Solar Decathlon-which challenges 20 collegiate teams to design, build, and operate solar-powered houses that are cost-effective, energy-efficient, and attractive-we are profiling each of the 20 teams participating in the competition. The students from the Southern California Institute of Architecture and California Institute of Technology, otherwise known as the SCI-Arc/Caltech team, have teamed up to take an interesting approach to the design of their

228

Capabilities of the ARCS Instrument - ORNL Neutron Sciences  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Capabilities of the ARCS Instrument Capabilities of the ARCS Instrument ARCS Overview The wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source (SNS) is optimized to provide a high neutron flux at the sample position with a large solid angle of detector coverage. The instrument incorporates modern neutron instrumentation, such as an elliptically focused neutron guide, high speed magnetic bearing choppers, and a massive array of 3He linear position sensitive detectors. Novel features of the spectrometer include the use of a large gate valve between the sample and detector vacuum chambers and the placement of the detectors within the vacuum, both of which provide a window-free final flight path to minimize background scattering while allowing rapid changing of the sample and

229

Arc Vault Significantly Reduces Electrical Hazards | GE Global...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

The transfer of arc flash energy is accomplished by triggering an ablative plasma gun to generate a 3-phase fault within a safe containment. The plasma gun operates in few...

230

Measurement of total ion current from vacuum arc plasmasources  

SciTech Connect (OSTI)

The total ion current generated by a vacuum arc plasma source was measured. The discharge system investigated allowed ion collection from the arc plasma streaming through a hemispherical mesh anode with geometric transparency of 72 percent. A range of different cathode materials was investigated, and the arc current was varied over the range 50-500 A. We find that the normalized ion current (Iion/Iarc) depends on the cathode material, with values in the range from 5 percent to 19 percent and generally greater for elements of low cohesive energy. The application of a strong axial magnetic field in the cathode and arc region leads to increased normalized ion current, but only by virtue of enhanced ion charge states formed in a strong magnetic field.

Oks, Efim M.; Savkin, Konstantin P.; Yushkov, Georgiu Yu.; Nikolaev, Alexey G.; Anders, A.; Brown, Ian G.

2005-07-01T23:59:59.000Z

231

Micro-arc oxidation coatings on Mg-Li alloys  

Science Journals Connector (OSTI)

Micro-arc oxidation (MAO) method was used for the...in-situ fabricated on the Mg-Li alloy. The morphology feature, phase composition, and corrosion-resistance of the formed ceramic coatings were studied by SEM, X...

Yongjun Xu; Kang Li; Zhongping Yao; Zhaohua Jiang; Milin Zhang

2009-04-01T23:59:59.000Z

232

Type B Accident Investigation of the Arc Flash at Brookhaven...  

Broader source: Energy.gov (indexed) [DOE]

B Accident Investigation of the Arc Flash at Brookhaven National Laboratory, April 14, 2006 More Documents & Publications DOE-HDBK-1092-1998 DOE-HDBK-1092-2004 DOE-HDBK-1092-2013...

233

Problems of physical modeling of electric-arc discharges  

Science Journals Connector (OSTI)

Special features of physical modeling of high-current arc discharges are considered. It is shown that the employment of dimensionless criterial expressions makes it possible to establish only approximate simil...

O. I. Yas'ko

234

Electric Parameters of the D.C. Carbon Arc  

Science Journals Connector (OSTI)

The basic electric parameters of an arc discharge are the current strength (i) and the voltage drop across the gap (V). Both quantities can be measured without difficulty. In general, a relationship between V and...

P. W. J. M. Boumans

1966-01-01T23:59:59.000Z

235

Effect of electric arc discharge on hypersonic blunt body drag  

Science Journals Connector (OSTI)

Experimental results on the effect of energy deposition using an electric arc discharge, upstream of a 60°...half angle blunt cone configuration in a hypersonic flow is reported.Investigations involving drag meas...

K. Satheesh; G. Jagadeesh

2009-01-01T23:59:59.000Z

236

Velocity of the electric arc in a plasmatron discharge chamber  

Science Journals Connector (OSTI)

An experimental investigation of the velocity of a high-current arc with air injection in the discharge chamber of a coaxial sectioned plasmatron is described. The experiments showed that the velocity of the c...

A. S. Shaboltas

1969-09-01T23:59:59.000Z

237

A forevacuum pulse arc-discharge-based plasma electron source  

Science Journals Connector (OSTI)

An arc-discharge-based electron source is described, which is designed for forming a pulsed wideaperture electron beam in the forevacuum pressure range (4...2 in the submillisecond range of pulse durations. The c...

A. V. Kazakov; V. A. Burdovitsin; A. V. Medovnik…

2013-11-01T23:59:59.000Z

238

Gyrocenter Shift of Low-Temperature Plasmas and the Retrograde Motion of Cathode Spots in Arc Discharges  

SciTech Connect (OSTI)

The gyrocenter shift phenomenon explained the mechanism of radial electric field formation at the high confinement mode transition in fusion devices. This Letter reports that the theory of gyrocenter shift is also applicable to low temperature high collisional plasmas such as arc discharges by the generalization of the theory resulting from a short mean free path compared with the gyroradius. The retrograde motion of cathode spots in the arc discharge is investigated through a model with the expanded formula of gyrocenter shift. It is found that a reversed electric field is formed in front of the cathode spots when they are under a magnetic field, and this reversed electric field generates a rotation of cathode spots opposite to the Amperian direction. The ion drift velocity profiles calculated from the model are in agreement with the experimental results as functions of magnetic flux density and gas pressure.

Lee, K. C. [Department of Applied Science, University of California, Davis, California 95616 (United States)

2007-08-10T23:59:59.000Z

239

Synthesis of silicon nanotubes by DC arc plasma method  

SciTech Connect (OSTI)

Plasma synthesis is a novel technique of synthesis of nanomaterials as they provide high rate of production and promote metastable reactions. Very thin walled silicon nanotubes were synthesized in a DC direct arc thermal plasma reactor. The effect of parameters of synthesis i.e. arc current and presence of hydrogen on the morphology of Si nanoparticles is reported. Silicon nanotubes were characterized by Transmission Electron Microscopy (TEM), Local Energy Dispersive X-ray analysis (EDAX), and Scanning Tunneling Microscopy (STM).

Tank, C. M.; Bhoraskar, S. V.; Mathe, V. L. [Department of Physics, University of Pune, Pune-7, Maharashtra (India)

2012-06-05T23:59:59.000Z

240

Experimental Study on Gasoline Reforming Assisted by Nonthermal Arc Discharge  

Science Journals Connector (OSTI)

The gasoline conversion efficiency decreased when the electric discharge regime was changing from continuous to gliding arc and from gliding to streamer. ... Compared with catalytic reformers, plasma devices have so far lower performances, which is explained by the early stage of research on nonthermal plasma reforming and the need of an external energy input (electricity). ... and design of the plasma reactor, composed of two gliding arc discharges in series, were detailed. ...

Jean-Damien Rollier; José Gonzalez-Aguilar; Guillaume Petitpas; Adeline Darmon; Laurent Fulcheri; Rudolf Metkemeijer

2007-12-06T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Measurements of the total ion flux from vacuum arc cathodespots  

SciTech Connect (OSTI)

The ion flux from vacuum arc cathode spots was measured in two vacuum arc systems. The first was a vacuum arc ion source which was modified allowing us to collect ions from arc plasma streaming through an anode mesh. The second discharge system essentially consisted of a cathode placed near the center of a spherically shaped mesh anode. In both systems, the ion current streaming through the mesh was measured by a biased collector. The mesh anodes had geometric transmittances of 60 percent and 72 percent, respectively, which were taken into account as correction factors. The ion current from different cathode materials was measured for 50-500 A of arc current. The ion current normalized by the arc current was found to depend on the cathode material, with values in the range from 5 percent to 19 percent. The normalized ion current is generally greater for elements of low cohesive energy. The ion erosion rates were determined from values of ion current and ion charge states, which were previously measured in the same ion source. The absolute ion erosion rates range from 16-173 mu g/C.

Anders, Andre; Oks, Efim M.; Yushkov, Georgy Yu; Savkin,Konstantin P.; Brown, Ian G.; Nikolaev, Alexey G.

2005-05-25T23:59:59.000Z

242

High-speed EDM milling with moving electric arcs  

Science Journals Connector (OSTI)

A novel high-speed electrical discharge machining (EDM) milling method using moving electric arcs has been proposed in this study. We connected a copper electrode rotating rapidly around its axis and a work piece to a DC power supply to generate a moving electric arc. To ensure high relative speed of any point on the electrode with respect to the work piece, the electrode was shaped like a pipe. It was observed that the electric arcs move rapidly within the discharge gap due to the revolution of the tool electrode, removing the materials on the electrode along the track of the arc roots. To explore the characteristics of machining with moving electric arcs, an EDM milling apparatus was devised. Two planes with approximately the same roughness were machined separately by this equipment and a traditional EDM machine for comparison. It was found that a much higher material removal rate can be easily achieved by EDM milling with moving electric arcs. In the meanwhile, wear of the tool electrode in this new method is negligible, which is greatly favorable for machining accuracy. The microstructures of these surfaces were also investigated for further information.

Fuzhu Han; Yongxain Wang; Ming Zhou

2009-01-01T23:59:59.000Z

243

Tunable, self-powered integrated arc plasma-melter vitrification system for waste treatment and resource recovery  

DOE Patents [OSTI]

The present invention provides a relatively compact self-powered, tunable waste conversion system and apparatus which has the advantage of highly robust operation which provides complete or substantially complete conversion of a wide range of waste streams into useful gas and a stable, nonleachable solid product at a single location with greatly reduced air pollution to meet air quality standards. The system provides the capability for highly efficient conversion of waste into high quality combustible gas and for high efficiency conversion of the gas into electricity by utilizing a high efficiency gas turbine or by an internal combustion engine. The solid product can be suitable for various commercial applications. Alternatively, the solid product stream, which is a safe, stable material, may be disposed of without special considerations as hazardous material. In the preferred embodiment of the invention, the arc plasma furnace and joule heated melter are formed as a fully integrated unit with a common melt pool having circuit arrangements for the simultaneous independently controllable operation of both the arc plasma and the joule heated portions of the unit without interference with one another. The preferred configuration of this embodiment of the invention utilizes two arc plasma electrodes with an elongated chamber for the molten pool such that the molten pool is capable of providing conducting paths between electrodes. The apparatus may additionally be employed with reduced or without further use of the gases generated by the conversion process. The apparatus may be employed as a self-powered or net electricity producing unit where use of an auxiliary fuel provides the required level of electricity production.

Titus, Charles H. (Newtown Square, PA); Cohn, Daniel R. (Chestnuthill, MA); Surma, Jeffrey E. (Kennewick, WA)

1998-01-01T23:59:59.000Z

244

Facility for high-heat flux testing of irradiated fusion materials and components using infrared plasma arc lamps  

Science Journals Connector (OSTI)

A new high-heat flux testing (HHFT) facility using water-wall stabilized high-power high-pressure argon plasma arc lamps (PALs) has been developed for fusion applications. It can accommodate irradiated plasma facing component materials and sub-size mock-up divertor components. Two PALs currently available at Oak Ridge National Laboratory can provide maximum incident heat fluxes of 4.2 and 27 MW m?2, which are prototypic of fusion steady state heat flux conditions, over a heated area of 9 ? 12 and 1 ? 10 cm2, respectively. The use of PAL permits the heat source to be environmentally separated from the components of the test chamber, simplifying the design to accommodate safe testing of low-level irradiated articles and materials under high-heat flux. Issues related to the operation and temperature measurements during testing of tungsten samples are presented and discussed. The relative advantages and disadvantages of this photon-based HHFT facility are compared to existing e-beam and particle beam facilities used for similar purposes.

Adrian S Sabau; Evan K Ohriner; Jim Kiggans; David C Harper; Lance L Snead; Charles R Schaich

2014-01-01T23:59:59.000Z

245

Facility for high heat flux testing of irradiated fusion materials and components using infrared plasma arc lamps  

SciTech Connect (OSTI)

A new high-heat flux testing facility using water-wall stabilized high-power high-pressure argon Plasma Arc Lamps (PALs) has been developed for fusion applications. It can handle irradiated plasma facing component materials and mock-up divertor components. Two PALs currently available at ORNL can provide maximum incident heat fluxes of 4.2 and 27 MW/m2 over a heated area of 9x12 and 1x10 cm2, respectively, which are fusion-prototypical steady state heat flux conditions. The facility will be described and the main differences between the photon-based high-heat flux testing facilities, such as PALs, and the e-beam and particle beam facilities more commonly used for fusion HHF testing are discussed. The components of the test chamber were designed to accommodate radiation safety and materials compatibility requirements posed by high-temperature exposure of low levels irradiated tungsten articles. Issues related to the operation and temperature measurements during testing are presented and discussed.

Sabau, Adrian S [ORNL] [ORNL; Ohriner, Evan Keith [ORNL] [ORNL; Kiggans, Jim [ORNL] [ORNL; Harper, David C [ORNL] [ORNL; Snead, Lance Lewis [ORNL] [ORNL; Schaich, Charles Ross [ORNL] [ORNL

2014-01-01T23:59:59.000Z

246

Comparison of Numerical Simulators for Greenhouse Gas Storage in Coalbeds, Part I: Pure Carbon Dioxide Injection  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Comparison of Numerical Simulators for Greenhouse Gas Storage Comparison of Numerical Simulators for Greenhouse Gas Storage in Coalbeds, Part I: Pure Carbon Dioxide Injection David H.-S. Law (law@arc.ab.ca; 780-450-5034) Alberta Research Council (ARC) Inc. 250 Karl Clark Road, Edmonton, Alberta, Canada T6N 1E4 L.H.G. (Bert) van der Meer (l.vandermeer@nitg.tno.nl; +31-30-256-4635) Netherlands Institute of Applied Geoscience TNO P.O. Box 80015, 3508 TA Utrecht, The Netherlands W.D. (Bill) Gunter (gunter@arc.ab.ca; 780-450-5467) Alberta Research Council (ARC) Inc. 250 Karl Clark Road, Edmonton, Alberta, Canada T6N 1E4 Abstract The injection of carbon dioxide (CO 2 ) in deep, unmineable coalbeds is a very attractive option for geologic CO 2 storage: the CO 2 is stored and at the same time the recovery of

247

Natural Gas  

Science Journals Connector (OSTI)

30 May 1974 research-article Natural Gas C. P. Coppack This paper reviews the world's existing natural gas reserves and future expectations, together with natural gas consumption in 1972, by main geographic...

1974-01-01T23:59:59.000Z

248

Deformation of a liquid surface due to an impinging gas jet: A conformal mapping approach  

E-Print Network [OSTI]

on it. The problem of a gas jet impinging on a liquid surface arises in several important industrialDeformation of a liquid surface due to an impinging gas jet: A conformal mapping approach Andong He to convert it to steel known as the basic oxygen conversion process1 . In the arc welding process, a high

249

Z .Surface and Coatings Technology 130 2000 164 172 Production of high-density Ni-bonded tungsten carbide  

E-Print Network [OSTI]

carbide coatings using an axially fed DC-plasmatron S. Sharafata,U , A. Kobayashib , S. Chena , N spraying; Nickel; Tungsten carbide 1. Introduction 1.1. General Since the mid-1990s, the market share of cemented Z .carbides has surpassed that of high-speed steels HSS , Z .with tungsten carbide WC having 50

Ghoniem, Nasr M.

250

Nanoparticles synthesis of tungsten disulfide via AOT-based microemulsions  

SciTech Connect (OSTI)

Graphical abstract: A controlled synthesis of WS2 nanoparticles (most probably inorganic fullerene (IF)) via microemulsion was applied for the first time to prepare WS2 (7–12 nm) by acidification of the water cores of the AOT reverse microemulsion. Highlights: ? An innovative reverse microemulsion technique was developed for WS{sub 2} synthesis. ? WS{sub 2} nanoparticles were obtained with narrow size distribution in range of 7–12 nm. ? Operating cost of microemulsion was lower in contrast to quartz reactor method. ? WS{sub 2} morphology could be controlled to obtain highly active and selective catalysts. ? Lower size of WS{sub 2} in this study overcomes the shortcoming of quartz reactor method. -- Abstract: The tungsten disulfide (WS{sub 2}) nanoparticles (most probably inorganic fullerene (IF)) with a narrow size distribution were synthesized by a reverse micelle technique for the first time. The particle size was controlled by varying water-to-surfactant molar ratio (W{sub 0}), aging time and reagent concentration. The synthesized WS{sub 2} nanoparticles were characterized by zetasizer, UV–visible spectrophotometers and transmission electron microscopy (TEM). The WS{sub 2} nanoparticles with particle diameter size of 7–12 nm were obtained via 24 h aging time. The particle size was controlled by changing the aging time and molar ratio of water/surfactant. Doubling W{sub 0} increased the amount and particle size of WS{sub 2} by 22 and 26%, respectively. The effect of aging time in the range of 6–24 h was investigated and the complete disappearance of yellowish color at 24 h resulted in an optically clear solution, which was the indication of WS{sub 2} formation with 100% conversion of reactant ((NH{sub 4}){sub 2}WS{sub 4}) in the batch reactor.

Ghoreishi, S.M., E-mail: ghoreshi@cc.iut.ac.ir [Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of); Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of); Meshkat, S.S. [Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of) [Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of); Department of Chemical Engineering, Urmia University of Technology, Urmia 57155-419 (Iran, Islamic Republic of); Ghiaci, M. [Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of)] [Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of); Dadkhah, A.A. [Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of)] [Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111 (Iran, Islamic Republic of)

2012-06-15T23:59:59.000Z

251

Molecular dynamics simulations of hydrogen bombardment of tungsten carbide surfaces P. Trskelin,1 N. Juslin,1 P. Erhart,2 and K. Nordlund1  

E-Print Network [OSTI]

Molecular dynamics simulations of hydrogen bombardment of tungsten carbide surfaces P. Träskelin,1 and tungsten carbide WC is of interest both due to the use of hydrogen-containing plasmas in thin. INTRODUCTION Tungsten carbide WC exhibits extraordinary hardness and temperature resistance. It has long been

Nordlund, Kai

252

Some Results of Researches of Powerful Pulse Discharges in Dense Gas Media P.G.Rutberg, A.A.Bogomaz, A.V.Budin, V.A.Kolikov, M.E.Pinchuk  

E-Print Network [OSTI]

Some Results of Researches of Powerful Pulse Discharges in Dense Gas Media P.G.Rutberg, A of the working gas P0 - (0.1-40) MPa. Energy introduced into gas (0.05-10) MJ Working gases - hydrogen, helium, nitrogen, air and argon. The kind of heat transfer between the arc and environmental gas and temperature

Paris-Sud XI, Université de

253

Deuterium Depth Profile in Neutron-Irradiated Tungsten Exposed to Plasma  

SciTech Connect (OSTI)

The effect of radiation damage has been mainly simulated using high-energy ion bombardment. The ions, however, are limited in range to only a few microns into the surface. Hence, some uncertainty remains about the increase of trapping at radiation damage produced by 14 MeV fusion neutrons, which penetrate much farther into the bulk material. With the Japan-US joint research project: Tritium, Irradiations, and Thermofluids for America and Nippon (TITAN), the tungsten samples (99.99 % pure from A.L.M.T., 6mm in diameter, 0.2mm in thickness) were irradiated to high flux neutrons at 50 C and to 0.025 dpa in the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL). Subsequently, the neutron-irradiated tungsten samples were exposed to a high-flux deuterium plasma (ion flux: 1021-1022 m-2s-1, ion fluence: 1025-1026 m-2) in the Tritium Plasma Experiment (TPE) at the Idaho National Laboratory (INL). First results of deuterium retention in neutron-irradiated tungsten exposed in TPE have been reported previously. This paper presents the latest results in our on-going work of deuterium depth profiling in neutron-irradiated tungsten via nuclear reaction analysis. The experimental data is compared with the result from non neutron-irradiated tungsten, and is analyzed with the Tritium Migration Analysis Program (TMAP) to elucidate the hydrogen isotope behavior such as retention and depth distribution in neutron-irradiated and non neutron-irradiated tungsten.

Masashi Shimada; G. Cao; Y. Hatano; T. Oda; Y. Oya; M. Hara; P. Calderoni

2011-05-01T23:59:59.000Z

254

Advanced RenewableEnergy Company ARC Energy | Open Energy Information  

Open Energy Info (EERE)

Advanced RenewableEnergy Company ARC Energy Advanced RenewableEnergy Company ARC Energy Jump to: navigation, search Name Advanced RenewableEnergy Company (ARC Energy) Place Nashua, New Hampshire Product New Hampshire-based stealth mode LED substrate manufacture equipment provider which aims to lower the cost of LEDs. Coordinates 42.758365°, -71.464209° 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":42.758365,"lon":-71.464209,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

255

ArcSafe® with Pulsed Arrested Spark Discharge  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ArcSafe® ArcSafe® with Pulsed Arrested Spark Discharge  2007 R&D 100 Award Entry Form ArcSafe® with Pulsed Arrested Spark Discharge  Joint Submitters Submitting Organization Sandia National Laboratories PO Box 5800, MS 1181 Albuquerque, NM 87185-1181 USA Larry Schneider Phone: (505) 845-7135 Fax: (505) 845-7685 Email: lxschne@sandia.gov AFFIRMATION: I affirm that all information submitted as a part of, or supplemental to, this entry is a fair and accurate represen- tation of this product. (Signature)______________________________________ Astronics-Advanced Electronic Systems, Inc. 9845 Willows Rd NE City: Redmond State: WA Zip/Postal: 98052-2540 USA Contact Name: Michael Ballas, Program Manager Phone: (425) 895-4304 Fax: (425)702.4930 Email: michael.ballas@astronics.com

256

A Miocene Island-Arc Volcanic Seamount- The Takashibiyama Formation,  

Open Energy Info (EERE)

Island-Arc Volcanic Seamount- The Takashibiyama Formation, Island-Arc Volcanic Seamount- The Takashibiyama Formation, Shimane Peninsula, Sw Japan Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Miocene Island-Arc Volcanic Seamount- The Takashibiyama Formation, Shimane Peninsula, Sw Japan Details Activities (0) Areas (0) Regions (0) Abstract: The Miocene volcanic complex of the Takashibiyama Formation consists largely of subalkali, subaqueous basalt to andesite lavas and andesite to dacite subaqueous volcaniclastic flow deposits. Most of subaqueous lavas are moderately to intensely brecciated with rugged rough surfaces and ramp structures similar to subaerial block lava. Volcaniclastic flow deposits commonly include basalt to andesite lava fragments and/or pyroclastic materials, and are similar in internal

257

Measurement of total ion flux in vacuum Arc discharges  

SciTech Connect (OSTI)

A vacuum arc ion source was modified allowing us to collections from arc plasma streaming through an anode mesh. The mesh had ageometric transmittance of 60 percent, which was taken into account as acorrection factor. The ion current from twenty-two cathode materials wasmeasured at an arc current of 100 A. The ion current normalized by thearc current was found to depend on the cathode material, with valuesinthe range from 5 percent to 11 percent. The normalized ion current isgenerally greater for light elements than for heavy elements. The ionerosion rates were determined fromvalues of ion currentand ion chargestates, which were previously measured in the same experimental system.The ion erosion rates range from 12-94 mu g/C.

Anders, Andre; Oks, Efim M.; Yushkov, Georgy Yu.; Brown, Ian G.

2004-04-12T23:59:59.000Z

258

Voltage flicker prediction for two simultaneously operated ac arc furnaces  

SciTech Connect (OSTI)

An EMTP-based arc furnace model was developed for evaluation of flicker concerns associated with supplying a large integrated steel mill as they go from one to two furnace operation and as system changes are implemented that will affect the short circuit capacity at the 230 kV power supply substation. The model includes a dynamic arc representation which is designed to be characteristic of the initial portions of the melt cycle when the arc characteristics are the most variable (worst flicker conditions). The flicker calculations are verified using previous measurements with one furnace operation. Flicker simulations were then performed to evaluate a variety of different possible system strengths with both one and two furnaces in operation. The primary flicker measure used for this study is the unweighted rms value of the fluctuation envelope, expressed as a percentage of the rms line-to-ground voltage magnitude.

Tang, L. [ABB Power T and D Co., Inc., Raleigh, NC (United States)] [ABB Power T and D Co., Inc., Raleigh, NC (United States); Kolluri, S. [Entergy Services, New Orleans, LA (United States)] [Entergy Services, New Orleans, LA (United States); McGranaghan, M.F. [Electrotek Concepts, Inc., Knoxville, TN (United States)] [Electrotek Concepts, Inc., Knoxville, TN (United States)

1997-04-01T23:59:59.000Z

259

PNNL 331 Building Arc Flash Team Investigation Report  

SciTech Connect (OSTI)

On Friday, April 21, 2006, a PNNL electrician was performing repair of an electrical system for the 331 Building chilled water pump (CHWP) No.2, when an electrical arc flash occurred inside a 480V combination motor starter. The electrician was taken to the on-site medical provider for evaluation and was released for return to work without restriction. The electrician was not shocked, but did receive a minor, superficial (first degree) burn on the left wrist. This report, the result of a thorough review by the 331 Building Arc Flash Assessment Team, provides an in-depth look at the steps leading up to the arc-flash and recommendations and opportunities for improvement.

Deichman, Mark L.; Drewrey, John C.; Hodges, Hurtis; Madson, Vernon J.; Minton, Allen L.; Montgomery, Daniel M.; Olson, Marvin E.; Rojas, Pedro H.; Sanan, Sanjay K.; Sharp, Reed D.; Sparks, Bobby R.; Swearingen, Gary L.

2006-06-06T23:59:59.000Z

260

Multipass Arc Lattice Design for Recirculating Linac Muon Accelerators  

SciTech Connect (OSTI)

Recirculating linear accelerators (RLA) are the most likely means to achieve rapid acceleration of short-lived muons to multi-GeV energies required for Neutrino Factories and TeV energies required for Muon Colliders. A drawback of this scheme is that a separate return arc is required for each passage of the muons through the linac. In the work described here, a novel arc optics based on a Non-Scaling Fixed Field Alternating Gradient (NSFFAG) lattice is developed, which would provide sufficient momentum acceptance to allow multiple passes (two or more consecutive energies) to be transported in one string of magnets. An RLA with significantly fewer arcs will reduce the cost. We will develop the optics and technical requirements to allow the maximum number of passes by using an adjustable path length to accurately control the returned beam to synchronize with the linac RF phase.

G.M. Wang, R.P. Johnson, S.A. Bogacz, D. Trbojevic

2009-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Waste Heat Recovery from High Temperature Off-Gases from Electric Arc Furnace  

SciTech Connect (OSTI)

This article presents a study and review of available waste heat in high temperature Electric Arc Furnace (EAF) off gases and heat recovery techniques/methods from these gases. It gives details of the quality and quantity of the sensible and chemical waste heat in typical EAF off gases, energy savings potential by recovering part of this heat, a comprehensive review of currently used waste heat recovery methods and potential for use of advanced designs to achieve a much higher level of heat recovery including scrap preheating, steam production and electric power generation. Based on our preliminary analysis, currently, for all electric arc furnaces used in the US steel industry, the energy savings potential is equivalent to approximately 31 trillion Btu per year or 32.7 peta Joules per year (approximately $182 million US dollars/year). This article describes the EAF off-gas enthalpy model developed at Oak Ridge National Laboratory (ORNL) to calculate available and recoverable heat energy for a given stream of exhaust gases coming out of one or multiple EAF furnaces. This Excel based model calculates sensible and chemical enthalpy of the EAF off-gases during tap to tap time accounting for variation in quantity and quality of off gases. The model can be used to estimate energy saved through scrap preheating and other possible uses such as steam generation and electric power generation using off gas waste heat. This article includes a review of the historical development of existing waste heat recovery methods, their operations, and advantages/limitations of these methods. This paper also describes a program to develop and test advanced concepts for scrap preheating, steam production and electricity generation through use of waste heat recovery from the chemical and sensible heat contained in the EAF off gases with addition of minimum amount of dilution or cooling air upstream of pollution control equipment such as bag houses.

Nimbalkar, Sachin U [ORNL; Thekdi, Arvind [E3M Inc; Keiser, James R [ORNL; Storey, John Morse [ORNL

2014-01-01T23:59:59.000Z

262

Graphite electrode DC arc furnace. Innovative technology summary report  

SciTech Connect (OSTI)

The Graphite Electrode DC Arc Furnace (DC Arc) is a high-temperature thermal process, which has been adapted from a commercial technology, for the treatment of mixed waste. A DC Arc Furnace heats waste to a temperature such that the waste is converted into a molten form that cools into a stable glassy and/or crystalline waste form. Hazardous organics are destroyed through combustion or pyrolysis during the process and the majority of the hazardous metals and radioactive components are incorporated in the molten phase. The DC Arc Furnace chamber temperature is approximately 593--704 C and melt temperatures are as high as 1,500 C. The DC Arc system has an air pollution control system (APCS) to remove particulate and volatiles from the offgas. The advantage of the DC Arc is that it is a single, high-temperature thermal process that minimizes the need for multiple treatment systems and for extensive sorting/segregating of large volumes of waste. The DC Arc has the potential to treat a wide range of wastes, minimize the need for sorting, reduce the final waste volumes, produce a leach resistant waste form, and destroy organic contaminants. Although the DC arc plasma furnace exhibits great promise for treating the types of mixed waste that are commonly present at many DOE sites, several data and technology deficiencies were identified by the Mixed Waste Focus Area (MWFA) regarding this thermal waste processing technique. The technology deficiencies that have been addressed by the current studies include: establishing the partitioning behavior of radionuclides, surrogates, and hazardous metals among the product streams (metal, slag, and offgas) as a function of operating parameters, including melt temperature, plenum atmosphere, organic loading, chloride concentration, and particle size; demonstrating the efficacy of waste product removal systems for slag and metal phases; determining component durability through test runs of extended duration, evaluating the effect of feed composition variations on process operating conditions and slag product performance; and collecting mass balance and operating data to support equipment and instrument design.

NONE

1999-05-01T23:59:59.000Z

263

Investigations of early stage precipitation in a tungsten-rich nickel-base superalloy using SAXS and SANS  

Science Journals Connector (OSTI)

Abstract Characterization of the early stage precipitation is an important issue as it controls the emerging microstructure developed on Ni-based superalloys which are used as single crystal blades in gas turbines. The difficulty is that the gamma prime precipitation occurs at high temperatures and the reaction kinetic is very fast. Therefore, experimental methods with high time resolution are needed to monitor ?? precipitation. By using the high flux synchrotron instrument HARWI-II set up of the Helmholtz–Zentrum Geesthacht with a fast data collection detector, it was possible to observe the creation of fine precipitates and their early growth in a tungsten-rich Ni-base superalloy. The cooling down of the superalloy from the single-phase region to lower temperatures already leads to the formation of precipitates in the size range of a few nm. The formation and growth of the precipitates at this early stage is described in detail. In addition, SANS measurements were performed at the new SANS-1 instrument at Maier–Leibnitz Zentrum (MLZ) in Garching to extend the results to larger precipitate sizes. DSC experiments were used to determine the critical temperatures of the formation of these fine precipitates, as well as the temperature at which they dissolve during heating (?? solvus temperature).

R. Gilles; D. Mukherji; H. Eckerlebe; L. Karge; P. Staron; P. Strunz; Th. Lippmann

2014-01-01T23:59:59.000Z

264

E-Print Network 3.0 - arc deposition system Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

in the Asir terrane, which was active between... erosion and deposition in the back-arc basin environment (Camp, 1984). Regional metamorphism in the WBMD... volcanic arc system. J....

265

Rates of tectonic and magmatic processes in the North Cascades continental magmatic arc  

E-Print Network [OSTI]

Continental magmatic arcs are among the most dynamic. geologic systems, and documentation of the magmatic, thermal, and tectonic evolution of arcs is essential for understanding the processes of magma generation, ascent ...

Matzel, Jennifer E. Piontek, 1973-

2004-01-01T23:59:59.000Z

266

ARCS FOUNDATION GLOBAL IMPACT AWARD Global Health, Public Good and Graduate Education  

E-Print Network [OSTI]

1 ARCS FOUNDATION GLOBAL IMPACT AWARD Global Health, Public Good and Graduate Education Case the ARCS Foundation Awards Luncheon in Atlanta on November 21, 2013. Application Materials: 1) A letter

Arnold, Jonathan

267

Evolution of residual stresses in micro-arc oxidation ceramic coatings on 6061 Al alloy  

Science Journals Connector (OSTI)

Most researches on micro-arc oxidation mainly focus on the application rather than ... dimensional stability and corrosion resistance, etc. The micro-arc oxidation ceramic coatings are produced on the surfaces .....

Dejiu Shen; Jingrui Cai; Changhong Guo…

2013-11-01T23:59:59.000Z

268

Comparative analysis of methods for ion-plasma sputter deposition and micro-arc oxidation  

Science Journals Connector (OSTI)

We describe the following advantages of micro-arc oxidation (MAO) over ion-plasma sputter deposition ... of operation by personnel. These advantages make micro-arc oxidation a promising technique for metallurgica...

M. V. Gerasimov

2007-11-01T23:59:59.000Z

269

Optimization of NH3 Decomposition by Control of Discharge Mode in a Rotating Arc  

Science Journals Connector (OSTI)

In this study, the characteristic behavior of a rotating arc was investigated. Various modes, depending on the electric power supplied, can be observed in a rotating arc. Each mode produces different discharge ch...

Dae Hoon Lee; Kwan-Tae Kim; Hee Seok Kang…

2014-01-01T23:59:59.000Z

270

Sliding electric arc discharge as a means of aircraft trajectory control  

Science Journals Connector (OSTI)

The dynamics of sliding electric arc discharge and the formation of shock waves in the stages of leader motion and the electric arc development in a supersonic air flow behind ... (bar). The air flow in the discharge

V. S. Aksenov; V. V. Golub; S. A. Gubin; V. P. Efremov…

2004-10-01T23:59:59.000Z

271

Numerical computation of electric arc with annular attachment on the cathode butt end  

Science Journals Connector (OSTI)

The results of computing a stationary arc with annular attachment on the butt end of a solid cylindrical cathode are presented. The influence of the discharge external parameters on the characteristics of arc ...

A. Zh. Zhainakov; R. M. Urusov; T. E. Urusova

2006-12-01T23:59:59.000Z

272

Growth Conditions of Double-Walled Carbon Nanotubes in Arc Discharge  

Science Journals Connector (OSTI)

Growth Conditions of Double-Walled Carbon Nanotubes in Arc Discharge ... Preparation conditions for large-scale synthesis of double-walled carbon nanotubes (DWCNTs) by using electric arc discharge were examined. ...

Yahachi Saito; Takanori Nakahira; Sashiro Uemura

2003-01-04T23:59:59.000Z

273

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

Science Journals Connector (OSTI)

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

E. B. Kulumbaev; T. B. Nikulicheva

2013-01-01T23:59:59.000Z

274

Parameters of free-burning arc discharge plasma in air with silver-based electrodes  

Science Journals Connector (OSTI)

We have used optical spectroscopy to study the radial temperature profiles for an electric arc plasma between silver electrodes and electrodes made ... . We established that the parameters of the arc discharge pl...

I. L. Babich; A. N. Veklich; L. A. Kryachko…

2006-05-01T23:59:59.000Z

275

Dependence of thermal destabilization of electric-arc plasma in an air flow on discharge conditions  

Science Journals Connector (OSTI)

The effect of the conditions of electric-arc burning in an air flow on the ... processes in the development of instability in an arc-discharge column is shown.

V. N. Borisyuk; S. V. Goncharik…

1997-03-01T23:59:59.000Z

276

E-Print Network 3.0 - arc box test Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

box test Search Powered by Explorit Topic List Advanced Search Sample search results for: arc box test Page: << < 1 2 3 4 5 > >> 1 Fat arcs for implicitly defined curves Szilvia...

277

A static voltage-current characteristic for the low current DC arc  

E-Print Network [OSTI]

systems has failed to detect arcing faults numerous times with disastrous consequences. The fault leaves a charred furrow, known as the ''arc track'', through Kapton cable insulation. Tests by NASA and others have confirmed that the average circuit...

Moores, Gregory Lee

2012-06-07T23:59:59.000Z

278

E-Print Network 3.0 - arc protection class Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

in a GIS: A Bidirectional Link between ArcView 2.0TM and XGobi Summary: . The XGobi remote proce- dures callable from within ArcView 2.0 can be grouped into two classes. One...

279

E-Print Network 3.0 - arc routing problem Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Sample search results for: arc routing problem Page: << < 1 2 3 4 5 > >> 1 GIS by ESRITM What is ArcGIS Summary: allocation) Solving complex routing problems Querying...

280

E-Print Network 3.0 - arc weld-surfacing process Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Electrical and Computer Engineering, University of Kentucky Collection: Engineering 3 GIS by ESRITM What is ArcGIS Summary: PlotTM, ArcEditTM, and so on). Geo- processing Map...

Note: This page contains sample records for the topic "gas tungsten arc" 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

Development of a Plasma Arc Manufacturing Process and Machine to Create Metal Oxide Particles in Water From Wire Feedstock.  

E-Print Network [OSTI]

??A plasma arc erosion process can be used to create metal and metal oxide particles in the ultra-fine size range (<70 um). An electric arc… (more)

George, Jonathan Alan 1983-

2010-01-01T23:59:59.000Z

282

Submersion Criticality Safety Analysis of Tungsten-Based Fuel for Nuclear Power and Propulsion Applications  

SciTech Connect (OSTI)

The Center for Space Nuclear Research (CSNR) is developing tungsten-encapsulated fuels for space nuclear applications. Aims to develop NTP fuels that are; Affordable Low impact on production and testing environment Producible on a large scale over suitable time period Higher-performance compared to previous graphite NTP fuel elements Space nuclear reactors remain subcritical before and during launch, and do not go critical until required by its mission. A properly designed reactor will remain subcritical in any launch abort scenario, where the reactor falls back to Earth and becomes submerged in terrestrial material. Submersion increases neutron reflection and thermalizes the neutrons, which typically increases the reactivity of the core. This effect is usually very significant for fast-spectrum reactors. This research provided a submersion criticality safety analysis for a representative tungsten/uranium oxide fueled reactor. Determine the submersion behavior of a reactor fueled by tungsten-based fuel. Considered fuel compositions with varying: Rhenium content (wt% rhenium in tungsten) Fuel loading fractions (UO2 vol%)

A.E. Craft; R. C. O'Brien; S. D. Howe; J. C. King

2014-07-01T23:59:59.000Z

283

Difference in formation of hydrogen and helium clusters in tungsten K. O. E. Henriksson,a  

E-Print Network [OSTI]

Difference in formation of hydrogen and helium clusters in tungsten K. O. E. Henriksson,a K online 12 October 2005 The experimentally observed large difference in the depths of hydrogen and helium and He embrittlement of materials. Yet many of the basic properties of such systems are not well

Krasheninnikov, Arkady V.

284

Thermal shock and fatigue resistance of tungsten materials under transient heat loading  

Science Journals Connector (OSTI)

Abstract Transient heat loading tests were performed on rolled pure tungsten (PW) and lanthanum oxide doped tungsten (WL10) as well as swaged + rolled potassium doped tungsten (W-K) samples using an electron beam. In thermal shock tests, the cracking threshold was 0.44–0.66, 0.17–0.22 and 0.44–0.66 GW/m2 for PW, WL10 and W-K, respectively. The melting threshold was over 1.1 GW/m2 for PW and W-K while 0.66–0.88 GW/m2 for WL10. In thermal fatigue tests, the obvious roughening threshold was over 1000 cycles for PW and WL10 while 1–100 cycles for W-K. The cracking threshold was 100–1000 cycles for PW, 1–100 cycles for WL10 and over 1000 cycles for W-K alloy. WL10 displayed worse thermal and fatigue resistance while W-K exhibited better properties compared with PW, which was attributed to differences in thermal–mechanical properties of the three tungsten alloys, in addition to the size and number density of La2O3 particles and potassium bubbles.

Xiaoxin Zhang; Qingzhi Yan; Shaoting Lang; Min Xia; Xiang Liu; Changchun Ge

2014-01-01T23:59:59.000Z

285

Utilization of geothermal energy in the mining and processing of tungsten ore. Final report  

SciTech Connect (OSTI)

The engineering, economic, and environmental feasibility of the use of low and moderate temperature geothermal heat in the mining and processing of tungsten ore is explored. The following are covered: general engineering evaluation, design of a geothermal energy system, economics, the geothermal resource, the institutional barriers assessment, environmental factors, an alternate geothermal energy source, and alternates to geothermal development. (MHR)

Erickson, M.V.; Lacy, S.B.; Lowe, G.D.; Nussbaum, A.M.; Walter, K.M.; Willens, C.A.

1981-01-01T23:59:59.000Z

286

Tungsten black absorber for solar light with wide angular operation range Eden Rephaeli1,a  

E-Print Network [OSTI]

Tungsten black absorber for solar light with wide angular operation range Eden Rephaeli1,a of Physics. DOI: 10.1063/1.2936997 In solar-thermal applications, one aims to convert sun- light to heat that displays near-complete absorptivity throughout the entire solar spectrum over a wide angular range

Fan, Shanhui

287

SPS Fabrication of Tungsten-Rhenium Alloys in Support of NTR Fuels Development  

SciTech Connect (OSTI)

Abstract. Tungsten metal slugs were fabricated via Spark Plasma Sintering (SPS) of powdered metals at temperatures ranging from 1575 K to 1975 K and hold times of 5 minutes to 30 minutes, using powders with an average diameter of 7.8 ?m. Sintered tungsten specimens were found to have relative densities ranging from 83 % to 94 % of the theoretical density for tungsten. Consolidated specimens were also tested for their Vickers Hardness Number (VHN), which was fitted as a function of relative density; the fully consolidated VHN was extrapolated to be 381.45 kg/mm2. Concurrently, tungsten and rhenium powders with average respective diameters of 0.5 ?m and 13.3 ?m were pre-processed either by High-Energy-Ball-Milling (HEBM) or by homogeneous mixing to yield W-25at.%Re mixtures. The powder batches were sintered at temperatures of 1975 K and 2175 K for hold times ranging from 0 minutes to 60 minutes yielding relative densities ranging from 94% to 97%. The combination of HEBM and sintering showed a significant decrease in the inter-metallic phases compared to that of the homogenous mixing and sintering.

Jonathan A. Webb; Indrajit Charit; Cory Sparks; Darryl P. Butt; Megan Frary; Mark Carroll

2011-02-01T23:59:59.000Z

288

Tungsten nano-tendril growth in the Alcator C-Mod divertor  

E-Print Network [OSTI]

Growth of tungsten nano-tendrils ('fuzz') has been observed for the first time in the divertor region of a high-power density tokamak experiment. After 14 consecutive helium L-mode discharges in Alcator C-Mod, the tip of ...

Baldwin, M.J.

289

Effect of Micro Arc Oxidation Coatings on Corrosion Resistance of 6061-Al Alloy  

Science Journals Connector (OSTI)

In the present study, the corrosion behavior of micro arc oxidation (MAO) coatings deposited at two current...

Nitin P. Wasekar; A. Jyothirmayi…

2008-10-01T23:59:59.000Z

290

Cyclic Strength of Titanium Alloys, Anodized under Micro-Arc Conditions, in Sea Water  

Science Journals Connector (OSTI)

The durability of titanium alloys having undergone micro-arc oxidation and then exposed to sea water is...

G. A. Lavrushin; S. V. Gnedenkov; P. S. Gordienko…

2002-07-01T23:59:59.000Z

291

Novel Surface Architecture Synthesis for Gas Separation and Fuel-Cell Catalyst Applications James Guthrie, Georgia Institute of Technology, SURF 2010 Fellow  

E-Print Network [OSTI]

Novel Surface Architecture Synthesis for Gas Separation and Fuel-Cell Catalyst Applications James-shell nanoparticle, Pt was deposited onto a flat surface substrate. Three separate substrates were used, Au(111 not significantly change over different voltages [3]. STM work was done using electrochemically etched tungsten tips

Li, Mo

292

Proposal of an Arc Detection Technique Based on RF Measurements for the ITER ICRF Antenna  

SciTech Connect (OSTI)

RF arc detection is a key operational and safety issue for the ICRF system on ITER. Indeed the high voltages inside the antenna put it at risk of arcing, which could cause substantial damage. This paper describes the various possibilities explored by circuit simulation and the strategy now considered to protect the ITER ICRF antenna from RF arcs.

Huygen, S.; Dumortier, P.; Durodie, F.; Messiaen, A.; Vervier, M.; Vrancken, M. [LPP/ERM-KMS, Association EURATOM-Belgian State, Brussels (Belgium); Wooldridge, E. [EURATOM/CCFE Fusion Association, Culham Science Centre (United Kingdom)

2011-12-23T23:59:59.000Z

293

Electric Arc Locator in Photovoltaic Power Systems Using Advanced Signal Processing Techniques  

E-Print Network [OSTI]

in detecting the partial discharges associated with the production of an electric arc in a high voltage power in fault detection and localization. In [1] we have shown that electric arc (or partial dischargeElectric Arc Locator in Photovoltaic Power Systems Using Advanced Signal Processing Techniques

Paris-Sud XI, Université de

294

EDFA Gain Flattening Using Long-Period Fibre Gratings Based on the Electric Arc Technique  

E-Print Network [OSTI]

of new stresses during the electric arc discharges as the main mechanism for their formation [5]. #12EDFA Gain Flattening Using Long-Period Fibre Gratings Based on the Electric Arc Technique O. Frazão of the long-period fibre grating is based on the electric arc technique. 1. Introduction. The gain flattening

Haddadi, Hamed

295

Sediment Budget Analysis System (SBAS) for ArcGIS 10 -User's Guide Page 1 of 49  

E-Print Network [OSTI]

Sediment Budget Analysis System (SBAS) for ArcGIS 10 - User's Guide Page 1 of 49 CESAM-OPJ-GIS Document current as of March 28, 2012 10:27 AM Sediment Budget Analysis System (SBAS) for ArcGIS 10 User's Guide D R AFT #12;Sediment Budget Analysis System (SBAS) for ArcGIS 10 - User's Guide Page 2 of 49 CESAM

US Army Corps of Engineers

296

Sediment Budget Analysis System (SBAS) for ArcGIS 10 -User's Guide Page 1 of 50  

E-Print Network [OSTI]

Sediment Budget Analysis System (SBAS) for ArcGIS 10 - User's Guide Page 1 of 50 CESAM-OPJ-GIS Document current as of June 27, 2012 10:09 AM Sediment Budget Analysis System (SBAS) for ArcGIS 10 User's Guide D R AFT #12;Sediment Budget Analysis System (SBAS) for ArcGIS 10 - User's Guide Page 2 of 50 CESAM

US Army Corps of Engineers

297

The fractal nature of vacuum arc cathode spots  

SciTech Connect (OSTI)

Cathode spot phenomena show many features of fractals, for example self-similar patterns in the emitted light and arc erosion traces. Although there have been hints on the fractal nature of cathode spots in the literature, the fractal approach to spot interpretation is underutilized. In this work, a brief review of spot properties is given, touching the differences between spot type 1 (on cathodes surfaces with dielectric layers) and spot type 2 (on metallic, clean surfaces) as well as the known spot fragment or cell structure. The basic properties of self-similarity, power laws, random colored noise, and fractals are introduced. Several points of evidence for the fractal nature of spots are provided. Specifically power laws are identified as signature of fractal properties, such as spectral power of noisy arc parameters (ion current, arc voltage, etc) obtained by fast Fourier transform. It is shown that fractal properties can be observed down to the cutoff by measurement resolution or occurrence of elementary steps in physical processes. Random walk models of cathode spot motion are well established: they go asymptotically to Brownian motion for infinitesimal step width. The power spectrum of the arc voltage noise falls as 1/f {sup 2}, where f is frequency, supporting a fractal spot model associated with Brownian motion.

Anders, Andre

2005-05-27T23:59:59.000Z

298

Self-organisation Processes In The Carbon ARC For Nanosynthis  

SciTech Connect (OSTI)

The atmospheric pressure carbon arc in inert gases such as helium is an important method for the production of nanomaterials. It has recently been shown that the formation of the carbon deposit on the cathode from gaseous carbon plays a crucial role in the operation of the arc, reaching the high temperatures necessary for thermionic emission to take place even with low melting point cathodes. Based on observed ablation and deposition rates, we explore the implications of deposit formation on the energy balance at the cathode surface, and show how the operation of the arc is self-organised process. Our results suggest that the can arc operate in two di erent regimes, one of which has an important contribution from latent heat to the cathode energy balance. This regime is characterised by the enhanced ablation rate, which may be favourable for high yield synthesis of nanomaterials. The second regime has a small and approximately constant ablation rate with a negligible contribution from latent heat.

Ng, Jonathan; Raitses, Yevgeny

2014-02-26T23:59:59.000Z

299

Anode Sheath Switching in a Carbon Nanotube Arc Plasma  

SciTech Connect (OSTI)

The anode ablation rate is investigated as a function of anode diameter for a carbon nanotube arc plasma. It is found that anomalously high ablation occurs for small anode diameters. This result is explained by the formation of a positive anode sheath. The increased ablation rate due to this positive anode sheath could imply greater production rate for carbon nanotubes.

Abe Fetterman, Yevgeny Raitses, and Michael Keidar

2008-04-08T23:59:59.000Z

300

A Distributed Arc-Consistency Algorithm T. Nguyen, Y. Deville  

E-Print Network [OSTI]

cient way of tackling constraint satisfaction problems (CSP). In particular, various arc and hardware design. Informally, a CSP is com- posed of a nite set of variables, each of which is taking values the variables can simultaneously take. Resolving a CSP consists in nding one or all complete assignments

Deville, Yves

Note: This page contains sample records for the topic "gas tungsten arc" 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

A Generic ArcConsistency Algorithm and its Specializations 1  

E-Print Network [OSTI]

con­ straint satisfaction problems (CSP). In particular, various arc­consistency algorithms have been constraints) and d is the size of the largest domain. Being applicable to the whole class of (binary) CSP as constraint satisfaction problems (CSP). A CSP is defined by a finite set of variables taking values from

Deville, Yves

302

A Generic Arc-Consistency Algorithm and its Specializations1  

E-Print Network [OSTI]

satisfaction problems (CSP). In particular, various arc-consistency algorithms have been proposed, originating is the size of the largest domain. Being applicable to the whole class of (binary) CSP, these algorithms do satisfaction problems (CSP). A CSP is de ned by a nite set of variables taking values from nite domains

Deville, Yves

303

Gas Turbines  

Science Journals Connector (OSTI)

When the gas turbine generator was introduced to the power generation ... fossil-fueled power plant. Twenty years later, gas turbines were established as an important means of ... on utility systems. By the early...

Jeffrey M. Smith

1996-01-01T23:59:59.000Z

304

Gas Turbines  

Science Journals Connector (OSTI)

... the time to separate out the essentials and the irrelevancies in a text-book. The gas ...gasturbine ...

H. CONSTANT

1950-10-21T23:59:59.000Z

305

Binary and ternary gas mixtures with temperature enhanced diffuse glow discharge characteristics for use in closing switches  

DOE Patents [OSTI]

An improvement to the gas mixture used in diffuse glow discharge closing switches is disclosed which includes binary and ternary gas mixtures which are formulated to exhibit decreasing electron attachment with increasing temperature. This increases the efficiency of the conductance of the glow discharge and further inhibits the formation of an arc. 11 figs.

Christophorou, L.G.; Hunter, S.R.

1988-06-28T23:59:59.000Z

306

Binary and ternary gas mixtures with temperature enhanced diffuse glow discharge characteristics for use in closing switches  

DOE Patents [OSTI]

An improvement to the gas mixture used in diffuse glow discharge closing switches is disclosed which includes binary and ternary gas mixtures which are formulated to exhibit decreasing electron attachment with increasing temperature. This increases the efficiency of the conductance of the glow discharge and further inhibits the formation of an arc. 11 figs.

Christophorou, L.G.; Hunter, S.R.

1990-06-26T23:59:59.000Z

307

Generation of high charge state ions in vacuum arc ion sources by a ``current jump'' method  

SciTech Connect (OSTI)

In the investigation of ion charge state distributions (CSD) in vacuum arc plasmas, good correlation between increase in arc operating voltage and mean ion charge state has been established. Therefore, to increase the mean charge state of a vacuum arc plasma, it is necessary to find ways to increase the arc operating voltage. The voltage can be increased via transients associated with the arc current by means of which a rather high operation voltage can be established across the discharge gap. Experiments were performed both in Tomsk and Berkeley with the discharge system of a vacuum arc ion source. To effect a step current rise an additional power supply was connected to the usual vacuum arc supply. This power supply made it possible to increase the vacuum arc current up to 1 kA for several {micro}s. As a rule the current jump was produced after 100--200 {micro}s into the main discharge pulse when all principal parameters of the vacuum arc were already established. To measure the CSD a time-of-flight method was used. As followed from experiments, superposition of a short, high current pulse to the vacuum arc current pulse is accompanied by a jump in arc operation voltage. Subsequently during the current step the voltage falls exponentially to one hundred volts after the completion of the current jump, and the arc voltage takes its conventional value (20--40V). Because of this increase in arc operation voltage, an enhancement of high charge station ion fractions was observed. For example, with a Ti-cathode with conventional arc parameters there is only very small value to Ti{sup 4+} ion fraction in the vacuum arc plasma. Applying strong magnetic field increases the fraction of these ions up to 20% of the total beam current. The current jump enhanced this value up to 40%.

Bugaev, A.S.; Oks, E.M.; Yushkov, G.Y.; Brown, I.G.

1999-07-01T23:59:59.000Z

308

Glass Inclusions in Mariana Arc Phenocrysts: A New Perspective on Magmatic Evolution in a Typical Intra-oceanic Arc1  

E-Print Network [OSTI]

Glass Inclusions in Mariana Arc Phenocrysts: A New Perspective on Magmatic Evolution in a Typical at Dallas, Box 830688, Richardson, TX 75083-0688, USA A B S T R A C T Major element compositions of glass of these lavas reflects accumulation of plagioclase. Glass inclusions also show the common occurrence of felsic

Stern, Robert J.

309

The Wyodak-Anderson coal assessment, Powder River Basin, Wyoming and Montana -- An ArcView project  

SciTech Connect (OSTI)

In 1997, more than 305 million short tons of clean and compliant coal were produced from the Wyodak-Anderson and associated coal beds and zones of the Paleocene Fort Union Formation in the Powder River Basin, Wyoming and Montana. To date, all coal produced from the Wyodak-Anderson, which averages 0.47 percent sulfur and 6.44 percent ash, has met regulatory compliance standards. Twenty-eight percent of the total US coal production in 1997 was from the Wyodak-Anderson coal. Based on the current consumption rates and forecast by the Energy Information Administration (1996), the Wyodak-Anderson coal is projected to produce 413 million short tons by the year 2016. In addition, this coal deposit as well as other Fort Union coals have recently been targeted for exploration and development of methane gas. New US Geological Survey (USGS) digital products could provide valuable assistance in future mining and gas development in the Powder River Basin. An interactive format, with querying tools, using ArcView software will display the digital products of the resource assessment of Wyodak-Anderson coal, a part of the USGS National Coal Resource Assessment of the Powder River Basin. This ArcView project includes coverages of the data point distribution; land use; surface and subsurface ownerships; coal geology, stratigraphy, quality and geochemistry; and preliminary coal resource calculations. These coverages are displayed as map views, cross sections, tables, and charts.

Flores, R.M.; Gunther, G.; Ochs, A.; Ellis, M.E.; Stricker, G.D.; Bader, L.R. [Geological Survey, Denver, CO (United States)

1998-12-31T23:59:59.000Z

310

Colorado Natural Gas Number of Gas and Gas Condensate Wells ...  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

Gas and Gas Condensate Wells (Number of Elements) Colorado Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

311

California Natural Gas Number of Gas and Gas Condensate Wells...  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

Gas and Gas Condensate Wells (Number of Elements) California Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4...

312

Louisiana Natural Gas Number of Gas and Gas Condensate Wells...  

U.S. Energy Information Administration (EIA) Indexed Site

Gas and Gas Condensate Wells (Number of Elements) Louisiana Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

313

Michigan Natural Gas Number of Gas and Gas Condensate Wells ...  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

Gas and Gas Condensate Wells (Number of Elements) Michigan Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

314

Oklahoma Natural Gas Number of Gas and Gas Condensate Wells ...  

U.S. Energy Information Administration (EIA) Indexed Site

Gas and Gas Condensate Wells (Number of Elements) Oklahoma Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

315

Virginia Natural Gas Number of Gas and Gas Condensate Wells ...  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

Gas and Gas Condensate Wells (Number of Elements) Virginia Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

316

Tennessee Natural Gas Number of Gas and Gas Condensate Wells...  

U.S. Energy Information Administration (EIA) Indexed Site

Gas and Gas Condensate Wells (Number of Elements) Tennessee Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

317

Pennsylvania Natural Gas Number of Gas and Gas Condensate Wells...  

Gasoline and Diesel Fuel Update (EIA)

Gas and Gas Condensate Wells (Number of Elements) Pennsylvania Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4...

318

Arkansas Natural Gas Number of Gas and Gas Condensate Wells ...  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

Gas and Gas Condensate Wells (Number of Elements) Arkansas Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

319

Maryland Natural Gas Number of Gas and Gas Condensate Wells ...  

Gasoline and Diesel Fuel Update (EIA)

Gas and Gas Condensate Wells (Number of Elements) Maryland Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

320

Illinois Natural Gas Number of Gas and Gas Condensate Wells ...  

U.S. Energy Information Administration (EIA) Indexed Site

Gas and Gas Condensate Wells (Number of Elements) Illinois Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

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


321

Missouri Natural Gas Number of Gas and Gas Condensate Wells ...  

Gasoline and Diesel Fuel Update (EIA)

Gas and Gas Condensate Wells (Number of Elements) Missouri Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

322

Mississippi Natural Gas Number of Gas and Gas Condensate Wells...  

U.S. Energy Information Administration (EIA) Indexed Site

Gas and Gas Condensate Wells (Number of Elements) Mississippi Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4...

323

Nebraska Natural Gas Number of Gas and Gas Condensate Wells ...  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

Gas and Gas Condensate Wells (Number of Elements) Nebraska Natural Gas Number of Gas and Gas Condensate Wells (Number of Elements) Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5...

324

Nonequilibrium phenomena and determination of plasma parameters in the hot core of the cathode region in free-burning arc discharges  

SciTech Connect (OSTI)

We present spectroscopic measurements of plasma parameters (electron density n{sub e}, electron temperature T{sub e}, gas temperature T{sub g}, underpopulation factor b) in the hot-core region in front of the cathode of a low-current, free-burning arc discharge in argon under atmospheric pressure. The discharge is operated in the hot-core mode, creating a hot cathode region with plasma parameters similar to high-current arcs in spite of the fact that we use comparatively low currents (less than 20 A). We use continuum emission and (optically thin) line emission to determine n{sub e} and T{sub e}. We apply relaxation measurements based on a power-interruption technique to investigate deviations from local thermodynamic equilibrium (LTE). These measurements let us determine the gas temperature T{sub g}. All measurements are performed side-on with charge-coupled-device cameras as detectors, so that all measured plasma parameters are spatially resolved after an Abel inversion. This yields the first ever spatially resolved observation of the non-LTE phenomena of the hot core in the near-cathode region of free-burning arcs. The results only partly coincide with previously published predictions and measurements in the literature.

Kuehn, Gerrit; Kock, Manfred [Institut fuer Atom- and Molekuelphysik, Abteilung Plasmaphysik, Universitaet Hannover, Germany Institut fuer Gravitationsphysik, Universitaet Hannover (Germany) and Max-Planck-Institut fuer Gravitationsphysik, Albert-Einstein-Institut, Hannover (Germany); Institut fuer Atom- and Molekuelphysik, Abteilung Plasmaphysik, Universitaet Hannover (Germany)

2007-01-15T23:59:59.000Z

325

Stability of very-high pressure arc discharges against perturbations of the electron temperature  

SciTech Connect (OSTI)

We study the stability of the energy balance of the electron gas in very high-pressure plasmas against longitudinal perturbations, using a local dispersion analysis. After deriving a dispersion equation, we apply the model to a very high-pressure (100 bar) xenon plasma and find instability for electron temperatures, T{sub e}, in a window between 2400 K and 5500-7000 K x 10{sup 3} K, depending on the current density (10{sup 6}-10{sup 8} A/m{sup 2}). The instability can be traced back to the Joule heating of the electron gas being a growing function of T{sub e}, which is due to a rising dependence of the electron-atom collision frequency on T{sub e}. We then analyze the T{sub e} range occurring in very high-pressure xenon lamps and conclude that only the near-anode region exhibits T{sub e} sufficiently low for this instability to occur. Indeed, previous experiments have revealed that such lamps develop, under certain conditions, voltage oscillations accompanied by electromagnetic interference, and this instability has been pinned down to the plasma-anode interaction. A relation between the mechanisms of the considered instability and multiple anodic attachments of high-pressure arcs is discussed.

Benilov, M. S. [Departamento de Fisica, Ciencias Exactas e Engenharia, Universidade da Madeira, Largo do Municipio, Funchal 9000 (Portugal); Hechtfischer, U. [Philips Lighting, BU Automotive Lamps, Technology, Philipsstrasse 8, Aachen 52068 (Germany)

2012-04-01T23:59:59.000Z

326

MAGENCO: A map generalization controller for Arc/Info  

SciTech Connect (OSTI)

The Arc/Info GENERALIZE command implements the Douglas-Peucker algorithm, a well-regarded approach that preserves line ``character`` while reducing the number of points according to a tolerance parameter supplied by the user. The authors have developed an Arc Macro Language (AML) interface called MAGENCO that allows the user to browse workspaces, select a coverage, extract a sample from this coverage, then apply various tolerances to the sample. The results are shown in multiple display windows that are arranged around the original sample for quick visual comparison. The user may then return to the whole coverage and apply the chosen tolerance. They analyze the ergonomics of line simplification, explain the design (which includes an animated demonstration of the Douglas-Peucker algorithm), and discuss key points of the MAGENCO implementation.

Ganter, J.H.; Cashwell, J.W.

1994-06-01T23:59:59.000Z

327

A Systematic Search for High Surface Brightness Giant Arcs in a Sloan Digital Sky Survey Cluster Sample  

E-Print Network [OSTI]

We present the results of a search for gravitationally-lensed giant arcs conducted on a sample of 825 SDSS galaxy clusters. Both a visual inspection of the images and an automated search were performed and no arcs were found. This result is used to set an upper limit on the arc probability per cluster. We present selection functions for our survey, in the form of arc detection efficiency curves plotted as functions of arc parameters, both for the visual inspection and the automated search. The selection function is such that we are sensitive only to long, high surface brightness arcs with g-band surface brightness mu_g 10. Our upper limits on the arc probability are compatible with previous arc searches. Lastly, we report on a serendipitous discovery of a giant arc in the SDSS data, known inside the SDSS Collaboration as Hall's arc.

J. Estrada; J. Annis; H. T. Diehl; P. B. Hall; T. Las; H. Lin; M. Makler; K. W. Merritt; V. Scarpine; S. Allam; D. Tucker

2007-01-12T23:59:59.000Z

328

2-M Probe At Tungsten Mountain Area (Kratt, Et Al., 2008) | Open Energy  

Open Energy Info (EERE)

Kratt, Et Al., Kratt, Et Al., 2008) Exploration Activity Details Location Tungsten Mountain Area Exploration Technique 2-M Probe Activity Date Usefulness useful DOE-funding Unknown Notes "To test if it would have been possible to find the Tungsten Mountain geothermal system with a shallow temperature survey, more than 80 2-meter-deep temperatures were recorded during a two week period in late June and early July, 2007. These measurements spanned an 8-km-long zone parallel to the range front and extended eastward from the range front up to 2 km towards the playa's edge (Figure 1). Two-meter temperatures ranged from 14.0°C up to a maximum of 26.7° C. The higher temperatures correspond to the area of exploration drilling, although anomalously high temperatures extend northeastward beyond the area of drilling. These

329

2-M Probe At Tungsten Mountain Area (Shevenell, Et Al., 2008) | Open Energy  

Open Energy Info (EERE)

Shevenell, Et Shevenell, Et Al., 2008) Exploration Activity Details Location Tungsten Mountain Area Exploration Technique 2-M Probe Activity Date Usefulness useful DOE-funding Unknown Notes Coolbaugh et al. (2007), Sladek et al. (2007), and Kratt, et al. (2008, this volume) describe a shallow temperature survey system in which temperatures can be measured quickly and inexpensively at 2 m depths. This system was tested at Desert Queen based on its structural setting and availability of thermal gradient well data obtained in the 1970's from which to make thermal anomaly comparisons. The system was subsequently used at Tungsten Mountain and Teels and Rhodes Marshes to help locate blind geothermal systems. Of the new, blind geothermal sites identified through collaboration with the minerals industry, shallow temperature surveys were

330

Thermal Gradient Holes At Tungsten Mountain Area (Shevenell, Et Al., 2008)  

Open Energy Info (EERE)

Shevenell, Et Al., 2008) Shevenell, Et Al., 2008) Exploration Activity Details Location Tungsten Mountain Area Exploration Technique Thermal Gradient Holes Activity Date Usefulness useful DOE-funding Unknown Notes Collaboration with the gold mining industry has brought two new geothermal discoveries to the attention of the geothermal community. Exploration holes at Tungsten Mountain and McGuiness Hills (Figure 1) in 2004 and 2005 encountered hot water and steam at depths of meters with fluid geothermometry indicating reservoir temperatures of 170 to 200oC. More information can be obtained from the Nevada Bureau of Mines and Geology web site (www.nbmg.unr.edu/geothermal/gtmap.pdf), and from a PowerPoint presentation titled 'Geothermal Exploration Short Stories' posted on the Geothermal Resources Council web site

331

SCI-Arc/Caltech Solar Decathlon 2011 Project Manual  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

CHIP CHIP 2 011 SCI---ARC / C altech S olar D ecathlon 2 011 As---Built P roject M anual 1 D.O.E. S olar D ecathlon 2 011 U.S. DEPARTMENT OF ENERGY SOLAR DECATHLON 2011 Team SCI-Arc/Caltech CHIP COMPACT HYPER_INSULATED PROTOTYPE Project Manual August 11,2011 Project Manager (Design and Construction): Reed Finlay (reed_finlay@sciarc.edu) Project Manager (PR and Development): Elisabeth Neigert (elisabeth_neigert@sciarc.edu) CHIP 2 011 SCI---ARC / C altech S olar D ecathlon 2 011 As---Built P roject M anual 2 D.O.E. S olar D ecathlon 2 011 Table o f C ontents Summary o f C hanges 2 Rules C ompliance C hecklist 3 Structural C alculations 6 Detailed W ater B udget 7 Summary o f U nlisted E lectrical C omponents 9 Summary o f R econfigurable F eatures 10 Interconnection A pplication F orm 11 Energy A nalysis R esults a nd D iscussion

332

Vacuum Arc Ion Sources: Recent Developments and Applications  

SciTech Connect (OSTI)

The vacuum arc ion source has evolved over the past twenty years into a standard laboratory tool for the production of high current beams of metal ions, and is now used in a number of different embodiments at many laboratories around the world. The primary application of this kind of source has evolved to be ion implantation for material surface modification. Another important use is for injection of high current beams of heavy metal ions into the front ends of particle accelerators, and much excellent work has been carried out in recent years in optimizing the source for reliable accelerator application. The source also provides a valuable tool for the investigation of the fundamental plasma physics of vacuum arc plasma discharges. As the use of the source has grown and diversified, at the same time the ion source performance and operational characteristics have been improved in a variety of different ways also. Here we review the growth and status of vacuum arc ion sources around the world, and summarize some of the applications for which the sources have been used.

Brown, Ian; Oks, Efim

2005-05-01T23:59:59.000Z

333

ACHIEVING THE REQUIRED COOLANT FLOW DISTRIBUTION FOR THE ACCELERATOR PRODUCTION OF TRITIUM (APT) TUNGSTEN NEUTRON SOURCE  

SciTech Connect (OSTI)

The Accelerator Production of Tritium neutron source consists of clad tungsten targets, which are concentric cylinders with a center rod. These targets are arranged in a matrix of tubes, producing a large number of parallel coolant paths. The coolant flow required to meet thermal-hydraulic design criteria varies with location. This paper describes the work performed to ensure an adequate coolant flow for each target for normal operation and residual heat-removal conditions.

D. SIEBE; K. PASAMEHMETOGLU

2000-11-01T23:59:59.000Z

334

Electrical conductivities of aluminum, copper, and tungsten observed by an underwater explosion  

SciTech Connect (OSTI)

Conductivities of dense aluminum, copper, and tungsten are evaluated using exploding wire discharges in water. Evolutions of the radius and the electrical resistance of exploding wire are measured together with direct pyrometric estimation of the temperature. The conductivities are evaluated based on the measurements and their density dependence is compared with theoretical predictions at a fixed temperature. The results indicate that regardless of materials, the conductivity has a minimum around 3% of solid density at temperature of 5000 K.

Sasaki, Toru [Department of Electrical Engineering, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka, Niigata 940-2188 (Japan); Nakajima, Mitsuo; Kawamura, Tohru; Horioka, Kazuhiko [Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama 226-8502 (Japan)

2010-08-15T23:59:59.000Z

335

Fracture and Creep in an All-Tungsten Divertor for ARIES  

E-Print Network [OSTI]

Fracture and Creep in an All- Tungsten Divertor for ARIES Jake Blanchard University of Wisconsin by these designs Fracture Thermal creep #12;The Design #12;Major Input Parameters Parameter Value Units Surface c/a=10 Fracture Results 0 1 2 3 4 5 6 7 8 0 0.2 0.4 0.6 StressIntensity(MPa-m1/2) Crack Depth (mm) c

California at San Diego, University of

336

Pulmonary toxicity after exposure to military-relevant heavy metal tungsten alloy particles  

SciTech Connect (OSTI)

Significant controversy over the environmental and public health impact of depleted uranium use in the Gulf War and the war in the Balkans has prompted the investigation and use of other materials including heavy metal tungsten alloys (HMTAs) as nontoxic alternatives. Interest in the health effects of HMTAs has peaked since the recent discovery that rats intramuscularly implanted with pellets containing 91.1% tungsten/6% nickel/2.9% cobalt rapidly developed aggressive metastatic tumors at the implantation site. Very little is known, however, regarding the cellular and molecular mechanisms associated with the effects of inhalation exposure to HMTAs despite the recognized risk of this route of exposure to military personnel. In the current study military-relevant metal powder mixtures consisting of 92% tungsten/5% nickel/3% cobalt (WNiCo) and 92% tungsten/5% nickel/3% iron (WNiFe), pure metals, or vehicle (saline) were instilled intratracheally in rats. Pulmonary toxicity was assessed by cytologic analysis, lactate dehydrogenase activity, albumin content, and inflammatory cytokine levels in bronchoalveolar lavage fluid 24 h after instillation. The expression of 84 stress and toxicity-related genes was profiled in lung tissue and bronchoalveolar lavage cells using real-time quantitative PCR arrays, and in vitro assays were performed to measure the oxidative burst response and phagocytosis by lung macrophages. Results from this study determined that exposure to WNiCo and WNiFe induces pulmonary inflammation and altered expression of genes associated with oxidative and metabolic stress and toxicity. Inhalation exposure to both HMTAs likely causes lung injury by inducing macrophage activation, neutrophilia, and the generation of toxic oxygen radicals. -- Highlights: ? Intratracheal instillation of W–Ni–Co and W–Ni–Fe induces lung inflammation in rats. ? W–Ni–Co and W–Ni–Fe alter expression of oxidative stress and toxicity genes. ? W–Ni–Co induces a greater oxidative burst response than W–Ni–Fe in lung macrophages.

Roedel, Erik Q., E-mail: Erik.Roedel@amedd.army.mil [Department of General Surgery, Tripler Army Medical Center, Honolulu, HI 96859 (United States); Cafasso, Danielle E., E-mail: Danielle.Cafasso@amedd.army.mil [Department of General Surgery, Tripler Army Medical Center, Honolulu, HI 96859 (United States); Lee, Karen W.M., E-mail: Karen.W.Lee@amedd.army.mil [Department of Clinical Investigation, Tripler Army Medical Center, Honolulu, HI 96859 (United States); Pierce, Lisa M., E-mail: Lisa.Pierce@amedd.army.mil [Department of Clinical Investigation, Tripler Army Medical Center, Honolulu, HI 96859 (United States)

2012-02-15T23:59:59.000Z

337

Tungsten oxide nanowire-reduced graphene oxide aerogel for high-efficiency visible light photocatalysis  

Science Journals Connector (OSTI)

Abstract A light, 3-D, porous aerogel was fabricated by way of a simple approach from 1-D tungsten oxide nanowires and 2-D reduced graphene oxide sheets. The as-prepared graphene oxide, tungsten oxide nanowires, and tungsten oxide-reduced graphene oxide (W18O49-RGO) aerogel were characterised. The photocatalytic activities of as-prepared aerogel under visible light irradiation were investigated through the degradation of six different organic dyes including Rhodamine B, reactive black 39, reactive yellow 145, weak acid black BR, methyl orange, and weak acid yellow G. In comparison with the pure W18O49 nanowires, the prepared W18O49-RGO aerogel had significantly improved photocatalytic efficiency. Also, the photocatalysis of W18O49-RGO aerogel maintained its efficiency after 30 cycles for each of the six dyes. The photocatalytic mechanism was studied by adding hole and radical scavengers: the results confirmed that the holes generated in W18O49-RGO aerogel played a key role in the visible light photocatalytic process.

Xiubing Li; Siwei Yang; Jing Sun; Peng He; Xuguang Xu; Guqiao Ding

2014-01-01T23:59:59.000Z

338

Spectral irradiance model for tungsten halogen lamps in 340-850 nm wavelength range  

SciTech Connect (OSTI)

We have developed a physical model for the spectral irradiance of 1 kW tungsten halogen incandescent lamps for the wavelength range 340-850 nm. The model consists of the Planck's radiation law, published values for the emissivity of tungsten, and a residual spectral correction function taking into account unknown factors of the lamp. The correction function was determined by measuring the spectra of a 1000 W, quartz-halogen, tungsten coiled filament (FEL) lamp at different temperatures. The new model was tested with lamps of types FEL and 1000 W, 120 V quartz halogen (DXW). Comparisons with measurements of two national standards laboratories indicate that the model can account for the spectral irradiance values of lamps with an agreement better than 1% throughout the spectral region studied. We further demonstrate that the spectral irradiance of a lamp can be predicted with an expanded uncertainty of 2.6% if the color temperature and illuminance values for the lamp are known with expanded uncertainties of 20 K and 2%, respectively. In addition, it is suggested that the spectral irradiance may be derived from resistance measurements of the filament with lamp on and off.

Ojanen, Maija; Kaerhae, Petri; Ikonen, Erkki

2010-02-10T23:59:59.000Z

339

Study of electrodeposited nickel-molybdenum, nickel-tungsten, cobalt-molybdenum, and cobalt-tungsten as hydrogen electrodes in alkaline water electrolysis  

SciTech Connect (OSTI)

Electrodeposited nickel-molybdenum, nickel-tungsten, cobalt-molybdenum, and cobalt-tungsten were characterized for the hydrogen evolution reaction (HER) in the electrolysis of 30 w/o KOH alkaline water at 25 C. The rate-determining step (rds) of the HER was suggested based on the Tafel slope of polarization and the capacitance of electrode-solution interface determined by ac impedance measurement. The HER on the nickel- and cobalt-based codeposits was enhanced significantly compared with that o the electrolytic nickel and cobalt with comparable deposit loadings. The decrease in the HER overpotential was more pronounced on the molybdenum-containing codeposits, particularly on cobalt-molybdenum which also showed a high stability. The enhancement of the HER was attributed to both the synergetic composition and the increased active surface of the codeposits. The real electrocatalytic activity of te electrodes and the effect of their and the increased active surface of the codeposits. The real electrocatalytic activity of the electrodes and the effect of their surface increase were distinguished quantitatively. The linear relations between HER overpotential and surface roughness factor of the electrodes on a Y-log(X) plot were obtained experimentally and interpreted based on the Tafel law.

Fan, C.; Piron, D.L.; Sleb, A.; Paradis, P. (Ecole Polytechnique de Montreal, Quebec (Canada). Dept. de Metallurgie et de Genie des Materiaux)

1994-02-01T23:59:59.000Z

340

SMOOTH OIL & GAS FIELD OUTLINES MADE FROM BUFFERED WELLS  

U.S. Energy Information Administration (EIA) Indexed Site

The VBA code provided at the bottom of this document is an updated version The VBA code provided at the bottom of this document is an updated version (from ArcGIS 9.0 to ArcGIS 9.2) of the polygon smoothing algorithm described below. A bug that occurred when multiple wells had the same location was also fixed. SMOOTH OIL & GAS FIELD OUTLINE POLYGONS MADE FROM BUFFERED WELLS Why smooth buffered field outlines? See the issues in the figure below: [pic] The smoothing application provided as VBA code below does the following: Adds area to the concave portions; doesn't add area to convex portions to maintain buffer spacing Fills in non-field "islands" smaller than buffer size Joins separate polygon rings with a "bridge" if sufficiently close Minimizes increase in total field area Methodology: creates trapezoids between neighboring wells within an oil/gas

Note: This page contains sample records for the topic "gas tungsten arc" 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

Radio frequency emission from high-pressure xenon arcs: A systematic experimental analysis of the underlying near-anode plasma instability  

SciTech Connect (OSTI)

High-pressure Xe discharge lamps at DC operation can show unwanted strong RF (radio-frequency) emission to beyond 1 GHz, correlated to a sharp periodic lamp-voltage instability in the near-anode plasma with a pulse repetition rate {epsilon} of 1-10 MHz. The physical origin of the instability is unclear. Here, its existence and pulse rate have been measured as a function of arc current I = 0.2-1.2 A and anode temperature T{sub a} = 1700-3400 K independently, in experimental lamps with pure-tungsten electrodes and a Xe operating pressure around p = 10 MPa. Surprisingly, the instability is not affected by I or current density j but exists if T{sub a} is lower than a threshold value around 2800-2900 K. The pulse rate {epsilon} is simply a rising linear function of the inverse anode temperature 1/T{sub a}, with only a small I-dependent correction. The average anode heat load is slightly lower in the unstable regime and possibly depends on {epsilon}. The results allow a consistent re-interpretation of earlier and present experimental observations and should be both a valuable help in practical lamp engineering and a tight constraint for future theories of this effect.

Hechtfischer, Ulrich [Philips Lighting, GBU Automotive Lamps, Technology, Philipsstrasse 8, 52068 Aachen (Germany)

2011-10-01T23:59:59.000Z

342

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

,366 ,366 95,493 1.08 0 0.00 1 0.03 29,406 0.56 1,206 0.04 20,328 0.64 146,434 0.73 - Natural Gas 1996 Million Percent of Million Percent of Cu. Feet National Total Cu. Feet National Total Net Interstate Movements: Industrial: Marketed Production: Vehicle Fuel: Deliveries to Consumers: Electric Residential: Utilities: Commercial: Total: South Carolina South Carolina 88. Summary Statistics for Natural Gas South Carolina, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ...........................................

343

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

0,216 0,216 50,022 0.56 135 0.00 49 1.67 85,533 1.63 8,455 0.31 45,842 1.45 189,901 0.95 - Natural Gas 1996 Million Percent of Million Percent of Cu. Feet National Total Cu. Feet National Total Net Interstate Movements: Industrial: Marketed Production: Vehicle Fuel: Deliveries to Consumers: Electric Residential: Utilities: Commercial: Total: M a r y l a n d Maryland 68. Summary Statistics for Natural Gas Maryland, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... NA NA NA NA NA Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 9 7 7 7 8 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 33 28 26 22 135 From Oil Wells ...........................................

344

Gas metal arc welding of duplex stainless steel using flux cored wire  

SciTech Connect (OSTI)

The effect of chemical compositions and welding parameters on pitting corrosion resistance and notch toughness of duplex stainless steel weld metals by FCAW was investigated. And the effect of welding parameters on hot cracking susceptibility of the FCAW weld metals was also studied. Pitting corrosion resistance was improved with the increase of Cr, Mo and N content in the weld metal, and it was also proved that the corrosion resistance was greatly affected by welding heat input. Hot cracking susceptibility of the weld metal was increased with the increase of welding current and welding speed.

Maruyama, T.; Ogawa, T.; Nishiyama, S.; Ushijima, A.; Yamashita, K. [Kobe Steel, Ltd., Fujisawa (Japan)

1994-12-31T23:59:59.000Z

345

Heat and Metal Transfer in Gas Metal Arc Welding Using Argon and Helium  

E-Print Network [OSTI]

. Massachusetts Institute of Tc:chnology, is Head of Secondary Metallurgy Group with MEFOS. Lulea, Sweden. T

Eagar, Thomas W.

346

PV Analyst: Coupling ArcGIS with TRNSYS to assess distributed photovoltaic potential in urban areas  

Science Journals Connector (OSTI)

This study presents a means to extend the functionality of Geographic Information Systems (GIS) in assessing distributed photovoltaic (PV) potential in urban areas, via the new ArcGIS extension: PV Analyst. A methodology is proposed for coupling ArcGIS with TRNSYS that enables the PV Analyst extension to use the capabilities of 4 and 5-parameter PV array performance models and the irradiance components in TRNSYS for solar energy simulations in geospatial contexts. Because PV Analyst is embedded within the ArcMap environment, part of ArcGIS software package, the strong capabilities of ArcGIS and other ArcGIS extensions such as 3D Analyst, Spatial Analyst and Tracking Analyst can be fully utilized with PV Analyst’s functionalities. This paper describes the concept and details of the extension development, as well as its application to the Pollock Commons area at the Pennsylvania State University.

Yosoon Choi; Jeffrey Rayl; Charith Tammineedi; Jeffrey R.S. Brownson

2011-01-01T23:59:59.000Z

347

Fundamentals of Discharge Initiation in Gas-Fed Pulsed Plasma Thrusters  

E-Print Network [OSTI]

-conductivity arc discharges are required for critically-damped matching of circuit components, and that relativelyFundamentals of Discharge Initiation in Gas-Fed Pulsed Plasma Thrusters IEPC-2005-153 Presented at the 29th International Electric Propulsion Conference, Princeton University October 31 ­ November 4, 2005

Choueiri, Edgar

348

Electrochemical noise sensors for detection of localized and general corrosion of natural gas transmission pipelines  

SciTech Connect (OSTI)

The U.S. Department of Energy, National Energy Technology Laboratory funded a Natural Gas Infrastructure Reliability program directed at increasing and enhancing research and development activities in topics such as remote leak detection, pipe inspection, and repair technologies and materials. The Albany Research Center (ARC), U.S. Department of Energy was funded to study the use of electrochemical noise sensors for detection of localized and general corrosion of natural gas transmission pipelines. As part of this, ARC entered into a collaborative effort with the corrosion sensor industry to demonstrate the capabilities of commercially available remote corrosion sensors for use with the Nation's Gas Transmission Pipeline Infrastructure needs. The goal of the research was to develop an emerging corrosion sensor technology into a monitor for the type and degree of corrosion occurring at key locations in gas transmission pipelines.

Holcomb, Gordon R.; Bullard, Sophie J.; Covino, Bernard S., Jr.; Cramer, Stephen D.; Russell, James H.; Ziomek-Moroz, Margaret

2002-09-01T23:59:59.000Z

349

,"Missouri Natural Gas Summary"  

U.S. Energy Information Administration (EIA) Indexed Site

Gas Wells (MMcf)","Missouri Natural Gas Gross Withdrawals from Oil Wells (MMcf)","Missouri Natural Gas Gross Withdrawals from Shale Gas (Million Cubic Feet)","Missouri Natural...

350

The characteristics of arcing faults in 480-volt power distribution systems  

E-Print Network [OSTI]

spontaneous arc-over to ground or to another phase. ~ Insulation failure due to surface conduction across conductive dust or contamination, or due to a cracked insulator body. ~ Conductive gases emanating from circuit breakers or fuses during circuit.... ~ Rodents or vermin, especially those returning from a wet outing to the warmth of the equipment. In tropical climates, snakes are known to have caused arcing faults across insulator strings. Since causes of arcing fault cannot always be eliminated in 480...

Shih, Yu?

2012-06-07T23:59:59.000Z

351

Tailored Distribution of Single-Wall Carbon Nanotubes from Arc Plasma Synthesis Using Magnetic Fields  

Science Journals Connector (OSTI)

We would like to acknowledge PPPL Offsite Research Program supported by the Office of Fusion Energy Sciences for supporting arc experiments. ...

Olga Volotskova; Jeffrey A. Fagan; Ji Yeon Huh; Frederick R. Phelan Jr.; Alexey Shashurin; Michael Keidar

2010-08-13T23:59:59.000Z

352

E-Print Network 3.0 - arc geothermal systems Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

for the Next 50 Years," EPRI ER-611-SR, Palo Alto, Ca.. ESRI: Using Arc... Utilized For District Heating Systems in Turkey," New Zealand ... Source: Stanford University -...

353

E-Print Network 3.0 - arc swedish section Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

arc swedish section Page: << < 1 2 3 4 5 > >> 1 Brita Bergman (born 303 1946) CURRICULUM VITAE 2011 Sign Language Section, Department of Linguistics Abridged version Summary:...

354

ARCS FOUNDATION GLOBAL IMPACT AWARD Global Health, Public Good and Graduate Education  

E-Print Network [OSTI]

ARCS FOUNDATION GLOBAL IMPACT AWARD Global Health, Public Good and Graduate Education Case Foundation Awards Luncheon in Atlanta on November 20, 2014. #12;Application Materials: 1) A letter

Arnold, Jonathan

355

A tool-path generation strategy for wire and arc additive manufacturing  

Science Journals Connector (OSTI)

This paper presents an algorithm to automatically generate optimal tool-paths for the wire and arc additive manufacturing (WAAM) process for a large class...

Donghong Ding; Zengxi (Stephen) Pan…

2014-07-01T23:59:59.000Z

356

Formation of micro-arc coatings on the surface of D16 aluminum alloy  

Science Journals Connector (OSTI)

Results of a study of how optically black coatings are formed by micro-arc oxidation on the surface of D16 aluminum alloy...

Zh. I. Bespalova; I. N. Panenko

2013-05-01T23:59:59.000Z

357

E-Print Network 3.0 - arc furnace dust Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collection: Renewable Energy 2 The Effec' of Furnace Design and Operation on Air Pollution Summary: chemical constituents in furnace gases arc very malodorous, or toxic, when...

358

E-Print Network 3.0 - arc plasma furnace Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

PLASMA PHYSICS AND ENGINEERING Summary: replace costly traditional technologies as incineration and conventional plasma arc furnaces, and provide... ASSOCIATED LABORATORY ON...

359

E-Print Network 3.0 - arc consistency revisited Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

University of Singapore Collection: Computer Technologies and Information Sciences 3 GIS by ESRITM What is ArcGIS Summary: is an integrated geographic information system (GIS)...

360

E-Print Network 3.0 - arc welding dynamic Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

a system IO board; arc sensor interface board for weld seam tracking... inverter power source renders possible ... Source: Ang Jr.,, Marcelo H. - Department of Mechanical...

Note: This page contains sample records for the topic "gas tungsten arc" 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

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

68,747 68,747 34,577 0.39 0 0.00 34 1.16 14,941 0.29 0 0.00 11,506 0.36 61,058 0.31 I d a h o Idaho 60. Summary Statistics for Natural Gas Idaho, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation.......................... 0 0 0 0 0 Vented

362

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

0 0 0 0.00 0 0.00 0 0.00 540 0.01 0 0.00 2,132 0.07 2,672 0.01 H a w a i i Hawaii 59. Summary Statistics for Natural Gas Hawaii, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation.......................... 0 0 0 0 0 Vented and Flared

363

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

483,052 483,052 136,722 1.54 6,006 0.03 88 3.00 16,293 0.31 283,557 10.38 41,810 1.32 478,471 2.39 F l o r i d a Florida 57. Summary Statistics for Natural Gas Florida, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 47 50 98 92 96 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 7,584 8,011 8,468 7,133 6,706 Total.............................................................. 7,584 8,011 8,468 7,133 6,706 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ...............

364

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

291,898 291,898 113,995 1.29 0 0.00 4 0.14 88,078 1.68 3,491 0.13 54,571 1.73 260,140 1.30 I o w a Iowa 63. Summary Statistics for Natural Gas Iowa, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation.......................... 0 0 0

365

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

Vehicle Fuel: Vehicle Fuel: Deliveries to Consumers: Electric Residential: Utilities: Commercial: Total: New England New England 36. Summary Statistics for Natural Gas New England, 1992-1996 Table 691,089 167,354 1.89 0 0.00 40 1.36 187,469 3.58 80,592 2.95 160,761 5.09 596,215 2.98 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................

366

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

29,693 29,693 0 0.00 0 0.00 6 0.20 17,290 0.33 0 0.00 16,347 0.52 33,644 0.17 District of Columbia District of Columbia 56. Summary Statistics for Natural Gas District of Columbia, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation..........................

367

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

42,980 42,980 14,164 0.16 0 0.00 1 0.03 9,791 0.19 23,370 0.86 6,694 0.21 54,020 0.27 D e l a w a r e Delaware 55. Summary Statistics for Natural Gas Delaware, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation..........................

368

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

-49,536 -49,536 7,911 0.09 49,674 0.25 15 0.51 12,591 0.24 3 0.00 12,150 0.38 32,670 0.16 North Dakota North Dakota 82. Summary Statistics for Natural Gas North Dakota, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 496 525 507 463 462 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 104 101 104 99 108 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 12,461 18,892 19,592 16,914 16,810 From Oil Wells ........................................... 47,518 46,059 43,640 39,760 38,906 Total.............................................................. 59,979 64,951 63,232 56,674 55,716 Repressuring ................................................

369

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

21,547 21,547 4,916 0.06 0 0.00 0 0.00 7,012 0.13 3 0.00 7,099 0.22 19,031 0.10 N e w H a m p s h i r e New Hampshire 77. Summary Statistics for Natural Gas New Hampshire, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation..........................

370

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

139,881 139,881 26,979 0.30 463 0.00 115 3.92 27,709 0.53 19,248 0.70 28,987 0.92 103,037 0.52 A r i z o n a Arizona 50. Summary Statistics for Natural Gas Arizona, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... NA NA NA NA NA Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 6 6 6 7 7 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 721 508 711 470 417 From Oil Wells ........................................... 72 110 48 88 47 Total.............................................................. 794 618 759 558 464 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease

371

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

Middle Middle Atlantic Middle Atlantic 37. Summary Statistics for Natural Gas Middle Atlantic, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 1,857 1,981 2,042 1,679 1,928 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 36,906 36,857 26,180 37,159 38,000 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 161,372 152,717 140,444 128,677 152,494 From Oil Wells ........................................... 824 610 539 723 641 Total.............................................................. 162,196 153,327 140,982 129,400 153,134 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed

372

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

386,690 386,690 102,471 1.16 0 0.00 43 1.47 142,319 2.72 5,301 0.19 98,537 3.12 348,671 1.74 M i n n e s o t a Minnesota 71. Summary Statistics for Natural Gas Minnesota, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation..........................

373

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

1,108,583 1,108,583 322,275 3.63 298 0.00 32 1.09 538,749 10.28 25,863 0.95 218,054 6.90 1,104,972 5.52 I l l i n o i s Illinois 61. Summary Statistics for Natural Gas Illinois, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... NA NA NA NA NA Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 382 385 390 372 370 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 337 330 323 325 289 From Oil Wells ........................................... 10 10 10 10 9 Total.............................................................. 347 340 333 335 298 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ...............

374

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

286,485 286,485 71,533 0.81 25 0.00 31 1.06 137,225 2.62 5,223 0.19 72,802 2.31 286,814 1.43 M i s s o u r i Missouri 73. Summary Statistics for Natural Gas Missouri, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... NA NA NA NA NA Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 5 8 12 15 24 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 27 14 8 16 25 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 27 14 8 16 25 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation..........................

375

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

411,951 411,951 100,015 1.13 0 0.00 5 0.17 114,365 2.18 45,037 1.65 96,187 3.05 355,609 1.78 Massachusetts Massachusetts 69. Summary Statistics for Natural Gas Massachusetts, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation..........................

376

Gas vesicles.  

Science Journals Connector (OSTI)

...in the suspending water, of concentration...MPa and balances the atmospheric pressure. Note that...versely, liquid water could not form by condensation inside the gas vesicle...presumably surrounded by water on all sides. At...

A E Walsby

1994-03-01T23:59:59.000Z

377

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

226,798 226,798 104,124 1.17 0 0.00 0 0.00 58,812 1.12 2,381 0.09 40,467 1.28 205,783 1.03 North Carolina North Carolina 81. Summary Statistics for Natural Gas North Carolina, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 0 0 0 0 0 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 0 0 0 0 0 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 0 0 0 0 0 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 0 0 0 0 0 Repressuring ................................................ 0 0 0 0 0 Nonhydrocarbon Gases Removed ............... 0 0 0 0 0 Wet After Lease Separation..........................

378

Measuring the pressure in ultrahigh-pressure mercury arcs  

SciTech Connect (OSTI)

Ultrahigh-pressure (UHP) mercury lamps are important as high-brightness light sources for digital projection. Hg pressures are usually above 20 MPa and difficult to measure. We have built special UHP lamps with a liquid Hg condensate in a temperature-controlled reservoir, allowing us to tune the Hg vapor pressure p between 14 and 30 MPa. As a simple measure for p, we recorded the width DELTAlambda of the 546 nm Hg line while varying p and also the lamp current I and voltage U. The data define a function p(DELTAlambda,I,U) that will deliver p to better than 3% from simple measurements of DELTAlambda, I, and U for most UHP lamps in the important 100-200 W power range. The method is applied to sample lamps, yielding pressures up to 26 MPa and demonstrating how filled Hg amount, burning position, arc gap, and lamp power affect the pressure. The effective temperature of typical UHP lamps is found to be 2400 K. We also derive an improved characteristic U(d,p,I) for the dependence of the arc voltage on arc gap, pressure, and current for electrode-stabilized Hg discharges in the UHP regime. Some aspects of the experiment are of general interest in the field of discharge lamps, such as a model for the heat balance of the Hg condensate under conductive, radiative, and evaporative cooling/heating, a short discussion of high-temperature vapor-pressure data for Hg, and an improved Hg equation of state for UHP conditions.

Hechtfischer, U.; Engelbrecht, B.; Carpaij, M.; Fischer, E.; Koerber, A. [Philips Research Laboratories, Weisshausstrasse 2, 52066 Aachen (Germany)

2009-09-01T23:59:59.000Z

379

genBRDF: Synthesizing Novel Analytic BRDFs with Genetic Programming Figure 1: Comparison of BRDFs modeling the tungsten carbide material from the MERL BRDF database. Each scene consists of a sphere  

E-Print Network [OSTI]

of BRDFs modeling the tungsten carbide material from the MERL BRDF database. Each scene consists that remains between state-of-the-art analytic BRDFs and measured data in the case of tungsten carbide

Weimer, Westley

380

Heat Recovery From Arc Furnaces Using Water Cooled Panels  

E-Print Network [OSTI]

to maintain a constant cooling water supply temperature in the cold well. The cooling tower fans can be manually reversed on slow speed for de-icing the cooling tower in winter to remove ice buildup on the slats. Level controller LL-2 shuts down pumps PI...HEAT RECOVERY FROM ARC FURNACES USING WATER COOLED PANELS D. F. Darby Deere & Company Moline, Illinois ABSTRACT In 1980-81, the John Deere Foundry at East Moline underwent an expansion program that in creased its capacity by over 60...

Darby, D. F.

Note: This page contains sample records for the topic "gas tungsten arc" 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

Flow shaping using three-dimensional microscale gas discharge  

SciTech Connect (OSTI)

We introduce a flow shaping mechanism using surface compliant microscale gas discharge. A three-dimensional finite element-based multiscale ionized gas flow code is utilized to analyze charge separation, potential distribution, and flow inducement mechanism. For the case of quiescent flow, a horseshoe-shaped plasma generator is introduced. Due to its unusual shape, the three-dimensional electric force excites a pinching effect on the fluid inside selectively powered electrode arc. Such effect is capable of tripping the flow-ejecting fluid normal to the plane of the actuator and thus can be very useful for many applications.

Wang, C.-C.; Roy, Subrata [Department of Mechanical and Aerospace Engineering, Computational Plasma Dynamics Laboratory and Test Facility, University of Florida, Gainesville, Florida 32611-6300 (United States)

2009-08-24T23:59:59.000Z

382

Modern control strategies for vacuum arc remelting of segregation sensitive alloys  

SciTech Connect (OSTI)

There are several process variables which are crucial to the control of vacuum arc remelting of segregation sensitive alloys. These are: electrode gap, melt rate, cooling rate, furnace annulus, furnace atmosphere and electrode quality (i.e. cleanliness and integrity). Of these variables, active, closed loop control is usually applied only to electrode gap. Other variables are controlled by controlling furnace operational parameters to preset schedules (e.g. melting current is ramped or held constant to control melt rate in an open loop fashion), through proper maintenance and calibration of equipment (e.g. to ensure proper cooling water and gas flow rates, or to accomplish an acceptable vacuum leak rate), through proper practice of procedures, and by maintaining electrode quality control. Electrode gap control is accomplished by controlling an electrode gap indicator such as drip-short frequency (or period) to a specified set-point. This type of control, though often adequate, ignores information available from other electrode gap indicators and is susceptible to upsets. A multiple input electrode gap controller is described which uses optimal estimation techniques to address this problem.

Williamson, R.L.; Schlienger, M.E. [Sandia National Labs., Albuquerque, NM (United States); Hysinger, C.L.; Beaman, J.J. [Univ. of Texas, Austin, TX (United States)

1997-06-01T23:59:59.000Z

383

Rifting of the Izu-Bonin arc in the Quaternary and Mid-Oligocene  

SciTech Connect (OSTI)

Eruption of middle Eocene-lower Oligocene boninites and island arc tholeiites created the 200 km wide Izu-Bonin arc massif following the initiation of subduction {approximately}50 Ma. Mid-Oligocene rifting formed a 40-70 km wide forearc basin between the Eocene outer-arc high and the Eo-Oligocene arc (now the frontal arc high), with maximum extension at the latitudes of the Bonin Ridge and Trough. The Oligocene forearc basin was rapidly (100-300 m/m.y.) filled with turbidite and debris flow deposits produced by concurrent volcanism and erosion of the surrounding highs. Contemporaneous stretching in the backarc region produced dominantly east-dipping, NNE-trending, normal faults and culminated in backarc spreading in the Shikoku basin (25-15 Ma), isolating the Palau-Kyushu remnant arc. The forearc and remnant arc sediments record a dearth of volcanogenic input between 23 and 17 Ma; evidence that an arc volcanic minimum accompanied backarc spreading. The middle Miocene to Recent volcanic front formed 0(S)-50(N) km west of the Oligocene arc and has loaded and flexed the forearc. Further west, chains of submarine volcanoes erupted along the extension of Shikoku basin fracture zones. Basaltic sills were emplaced in the forearc. Explosive volcanism from rhyolitic calderas has increased dramatically since the late Pliocene, especially in the last 0.2 Ma. Since {approximately}2 Ma the arc has been stretched again, producing rapidly subsiding (300-2,250 m/m.y.) graben, immediately west of the volcanic front, which are segmented along strike by oblique transfer zones. The Sumisu Rift is partially filled with (<1.5 Ma) volcaniclastic turbidites and hemipelagic sediments and is intruded by backarc basin basalts. About 1 km of syn-rift uplift of the arc margin footwall has produced an unconformity, beneath surficial pumice, that extends back to pumiceous sediments >2.35 Ma.

Taylor, B. (Univ. of Hawaii, Honolulu (USA))

1990-06-01T23:59:59.000Z

384

Experimental investigation of supersonic low pressure air plasma flows obtained with different arc-jet operating conditions  

SciTech Connect (OSTI)

A stationary arc-jet plasma flow at low pressure is used to simulate some properties of the gas flow surrounding a vehicle during its entry into celestial body's atmospheres. This paper presents an experimental study concerning plasmas simulating a re-entry into our planet. Optical measurements have been carried out for several operating plasma conditions in the free stream, and in the shock layer formed in front of a flat cylindrical plate, placed in the plasma jet. The analysis of the spectral radiation enabled the identification of the emitting species, the determination of the rotational and vibrational temperatures in the free-stream and in the shock layer and the determination of the distance of the shock to the flat plate face. Some plasma fluid parameters like, stagnation pressure, specific enthalpy and heat flux have been determined experimentally along the plasma-jet axis.

Lago, Viviana; Ndiaye, Abdoul-Aziz [Laboratoire ICARE CNRS, 1C Av. de la Recherche Scientifique 45071 Orleans Cedex 2 (France)

2012-11-27T23:59:59.000Z

385

The self-propagation high-temperature synthesis (SHS) of ultrafine high purity tungsten powder from scheelite  

SciTech Connect (OSTI)

High-purity tungsten was prepared by self-propagating high-temperature synthesis (SHS) process from a mixture of CaO{center_dot}WO{sub 3} and Mg. The complete reduction of CaO{center_dot}WO{sub 3} required a 33{percent} excess of magnesium over the stoichiometric molar ratio Mg/CaO{center_dot}WO{sub 3} of 3:1. The MgO and CaO in the product was leached with an HCl solution. The product tungsten had a purity of 99.980{percent} which was higher than that of the reactants. The high purity results because the non tungsten reactants and products are volatilized by the high temperatures generated during the rapid exothermic SHS reaction and are dissolved during HCl leaching of the product. {copyright} {ital 1996 Materials Research Society.}

Jung, J.C.; Ko, S.G.; Won, C.W.; Cho, S.S.; Chun, B.S. [Engineering Research Center for Rapidly Solidified Materials, Chungnam National University, Daejeon 305-764 (Korea)

1996-07-01T23:59:59.000Z

386

Using an 80% CF4+20% CO2 gas mixture to recover aged anode wires in proportional chambers  

Science Journals Connector (OSTI)

A technique to recover a gas proportional counter with an aged anode wire using a glow discharge in an 80%CF4+20%CO2 gas mixture, has been developed and tested. Studies of aging effects were carried out under sustained irradiation by an intense 90Sr ?-source of straw proportional counters operated with a 60%Ar+30%CO2+10%CF4 gas mixture. Special attention was paid to the aging mechanism of the anode wires. Our experience showed that using a given gas mixture the swelling of the anode wires is a typical mode of aging that leads to degradation of the gas gain. The proposed method restores the gas gain and the signal amplitude in the damaged zone of the wire. SEM/XEM analysis confirmed that the tungsten oxide deposits have been removed.

G.E. Gavrilov; D.A. Aksenov; R. Conti; A.A. Fetisov; A.G. Krivchitch; D.A. Maysuzenko; N.Yu. Shvecova; V.M. Vakhtel

2012-01-01T23:59:59.000Z

387

Advanced Resin Cleaning System (ARCS) at Grand Gulf Nuclear Station  

SciTech Connect (OSTI)

Steam generation system in-core components can undergo serious material degradation by a variety of corrosion-related phenomena. These phenomena are largely controlled by boiler water (i.e. reactor water) chemistry which is strongly impacted by the performance of the condensate system mixed bed ion exchange units. In Boiling Water Reactors (BWR), the mixed bed ion exchange units not only provide protection from ionic contaminants, but also remove insoluble corrosion products by filtration/adsorption. These insoluble corrosion products removed by the ion exchange units must then be periodically cleaned from the resin bed by some process external to the BWR primary water loop. A unique resin cleaning process called the {open_quotes}Advanced Resin Cleaning System{close_quotes} (ARCS) was developed in the late 1980`s by members of CENTEC-XXI, located in Santa Clara, CA. This system, which has been successfully operated for several years at a Pressurized Water Reactor is highly efficient for removal of both insoluble corrosion products and anion/cation resin fines, and generates significantly less waste water than other cleaning methods. The ARCS was considered the most attractive method for meeting the demanding and costly resin cleaning needs of a BWR. A {open_quotes}Tailored Collaboration{close_quotes} project was initiated between EPRI, Entergy Operations (Grand Gulf Station), and CENTEC-XXI to demonstrate the {open_quotes}Advanced Resin Cleaning System{close_quotes} in a BWR.

Asay, R.H.; Earls, J.E.; Naughton, M.D. [Centec 21, Inc., Santa Clara, CA (United States)

1996-10-01T23:59:59.000Z

388

Subchannel thermal-hydraulic modeling of an APT tungsten target rod bundle  

SciTech Connect (OSTI)

The planned target for the Accelerator Production of Tritium (APT) neutron source consists of an array of tungsten rod bundles through which D{sub 2}O coolant flows axially. Here, a scoping analysis of flow through an APT target rod bundle was conducted to demonstrate that lateral cross-flows are important, and therefore subchannel modeling is necessary to accurately predict thermal-hydraulic behavior under boiling conditions. A local reactor assembly code, FLOWTRAN, was modified to model axial flow along the rod bundle as flow through three concentric heated annular passages.

Hamm, L.L.; Shadday, M.A. Jr.

1997-09-01T23:59:59.000Z

389

Effect of demagnetization on magnetic resonance line shapes in bulk samples: Application to tungsten  

Science Journals Connector (OSTI)

A calculation of the contribution of a bulk specimen's nonuniform demagnetizing field to the inhomogeneous broadening of magnetic resonance lines is described. Demagnetization effects are of particular importance for substances with large bulk magnetic susceptibilities located in large static magnetic fields. Application is made to the nuclear acoustic resonance of W183 spins in a bulk cylindrical specimen of tungsten. In addition to explaining the observed inhomogeneous line broadening, the calculation predicts a "satellite" line which is also observed experimentally. Although attention is paid to specifically acoustic considerations, the calculation is applicable to magnetic resonance in general.

George Mozurkewich; H. I. Ringermacher; D. I. Bolef

1979-07-01T23:59:59.000Z

390

Deposition of tungsten nitride on stainless steel substrates using plasma focus device  

Science Journals Connector (OSTI)

Tungsten nitride (WN) films were deposited on the stainless steel-304 substrate by a 2 kJ Mather-type plasma focus device. The preparation method and characterization data are presented. X-ray diffractometer (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were employed for the characterization of the samples obtained with different number of focus shots, respectively. The average size of crystallites (from XRD), sub-micro-structures (from SEM) and particles (from AFM images) increase when the number of shots increase from 10 to 20 then 30, then they decrease when the substrate is exposed to 40 shots.

G.R. Etaati; M.T. Hosseinnejad; M. Ghoranneviss; M. Habibi; M. shirazi

2011-01-01T23:59:59.000Z

391

An Electrical Instrument for Detecting Invisible Flaws in Nonmagnetic Conductors Such as Tungsten  

Science Journals Connector (OSTI)

In this instrument the conductor being inspected is passed axially through a coil forming a part of the tuned circuit of an oscillator. Any flaws in the conductor cause a change in the tuning and thus in the frequency generated which is conveniently observed through heterodyning with a fixed frequency. By using high frequency of the order of 6000 kilocycles the response is limited to flaws near the surface of the conductor. This instrument is used in the factory inspection of tungsten wire particularly for the location of longitudinal cracks and is also effective in the determination of asymmetry of coated wires.

D. W. Dana

1934-01-01T23:59:59.000Z

392

Stefan–Boltzmann law for the tungsten filament of a light bulb: Revisiting the experiment  

Science Journals Connector (OSTI)

A classical laboratory experiment to verify the Stefan-Boltzmann radiation law with the tungsten filaments of commercial incandescent lamps has been fully revisited collecting a fairly large amount of data with a computer-controlled four-channel power supply. In many cases the total power dissipated by the lamp is well described by a sum of two power-law terms with one exponent very close to 4 as predicted by the radiation law and the other very close to 1 as for simple heat conduction. This result was true even for filament surfaces with a shiny metallic appearance whose emissivity should vary with temperature.

2013-01-01T23:59:59.000Z

393

Ground Gas Handbook  

Science Journals Connector (OSTI)

...pathways of least resistance to gas transport, and applications are discussed, such as migrating landfill gas emissions, also from leaking landfill gas collection systems, as well as natural gas and oil-field gas leakage from abandoned production...

Allen W Hatheway

394

Gas Delivered  

Gasoline and Diesel Fuel Update (EIA)

. Average . Average Price of Natural Gas Delivered to Residential Consumers, 1980-1996 Figure 1980 1982 1984 1986 1988 1990 1992 1994 1996 0 2 4 6 8 10 0 40 80 120 160 200 240 280 320 Dollars per Thousand Cubic Feet Dollars per Thousand Cubic Meters Nominal Dollars Constant Dollars Sources: Nominal dollars: Energy Information Administration (EIA), Form EIA-176, "Annual Report of Natural and Supplemental Gas Supply and Disposition." Constant dollars: Prices were converted to 1995 dollars using the chain-type price indexes for Gross Domestic Product (1992 = 1.0) as published by the U. S. Department of Commerce, Bureau of Economic Analysis. Residential: Prices in this publication for the residential sector cover nearly all of the volumes of gas delivered. Commercial and Industrial: Prices for the commercial and industrial sectors are often associated with

395

ARC-coal acetylene process development program. Phase 1B. Final technical progress report, 15 September 1979-31 September 1980  

SciTech Connect (OSTI)

For many years, acetylene was a major feedstock in the chemical industry, being used for the manufacture of such important large-volume chemicals as vinyl chloride, vinyl acetate, acrylonitrile, acetaldehyde, and several others chemicals. Since the mid-1960's, however, acetylene has been largely replaced by olefins like ethylene and propylene. These olefins, though sometimes less suitable as feedstocks than acetylene, became more economical as they became readily available at prices considerably lower than acetylene. The successful development of the Arc-Coal process appears to offer a new competitive option to ethylene while reducing the risk of feedstock shortage by relying on the vast coal resources within the US. The Arc-Coal Acetylene process has been tested successfully at both the 100 kW and 1 MW levels, clearly demonstrating that acetylene can be economically produced from coal in a one-step reaction, and that the current reactor design approach is capable of being scaled up to commercial size. The process is shown to be commercially competitive with the currently available process for acetylene manufacture and, more importantly, competes attractively with ethylene in the manufacture of vinyl chloride and vinyl acetate. With the commercial advent of the arc-coal acetylene process, it will become possible to manufacture acetylene more economically than by conventional process. Substantial ethylene price increases tied closely to, and driven by, higher crude oil and natural gas prices are a clear long-term trend which appears certain to continue well into the foreseeable future with periodic market variations. This situation will make the Arc-coal Acetylene process a leading contender for the production of chemicals such as vinyl chloride and vinyl acetate, substituting a coal feedstock process for the current liquid hydrocarbon-fed ethylene-to-vinyl monomers processes.

Not Available

1980-10-30T23:59:59.000Z

396

Spatial and time-dependent distribution of plasma parameters in the metal-halide arc lamp.  

E-Print Network [OSTI]

Spatial and time-dependent distribution of plasma parameters in the metal-halide arc lamp. A. Khakhaev, L. Luizova, K. Ekimov and A. Soloviev Petrozavodsk State University, Russia The metal-halide arc lamp is an effective light source and its investigation has a long history, but even at present some

Paris-Sud XI, Université de

397

The effects of micro arc oxidation of gamma titanium aluminide surfaces on osteoblast adhesion and differentiation  

Science Journals Connector (OSTI)

The adhesion and proliferation of human fetal osteoblasts, hFOB 1.19, on micro arc oxidized (MAO) gamma titanium aluminide (?TiAl ... 6Al-4V disks to study the effect of micro arc oxidation and glass coverslips a...

Pricilla Santiago-Medina; Paul A. Sundaram…

2014-06-01T23:59:59.000Z

398

Spectroscopy of atmospheric pressure air jet plasma in transverse arc discharge Valeriy Chernyak1  

E-Print Network [OSTI]

Spectroscopy of atmospheric pressure air jet plasma in transverse arc discharge Valeriy Chernyak1 of the atmospheric pressure air jet plasma in the transverse cw dc arc discharge of high voltage was done. Within.g. application of approximation of the optically thin plasma in conditions of high atmospheric pressure

Paris-Sud XI, Université de

399

Thermodynamics and Kinetics Analysis of Gasoline Reforming Assisted by Arc Discharge  

Science Journals Connector (OSTI)

Thermodynamics and Kinetics Analysis of Gasoline Reforming Assisted by Arc Discharge ... In the first one, the electric discharge is accounted for as a homogeneous energy source inside the whole reactor. ... kinetic schemes, without inclusion of specific plasma processes, is sufficient for simulation of H prodn. in discharges with hot plasmas, in particular, in low-current arc discharges. ...

Jean-Damien Rollier; Guillaume Petitpas; José Gonzalez-Aguilar; Adeline Darmon; Laurent Fulcheri; Rudolf Metkemeijer

2008-04-18T23:59:59.000Z

400

Synthesis of High Quality Single-Walled Carbon Nanotube Silks by the Arc Discharge Technique  

Science Journals Connector (OSTI)

Synthesis of High Quality Single-Walled Carbon Nanotube Silks by the Arc Discharge Technique ... Cerium was found to be a good element for stabilizing the electric arc, though the SWNT products as-grown from Ce had a low purity. ...

Hong-wei Zhu; Bin Jiang; Cai-lu Xu; De-hai Wu

2003-06-17T23:59:59.000Z

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


401

Memory-influencing intra-basolateral amygdala drug infusions modulate expression of Arc  

E-Print Network [OSTI]

Memory-influencing intra-basolateral amygdala drug infusions modulate expression of Arc protein processes. Infusions of the -adrenoreceptor agonist, clen- buterol, into the BLA immediately after training increased Arc protein levels in the dorsal hippocampus. Additionally, posttraining intra-BLA infusions

O'Toole, Alice J.

402

Oxygen and Nitroaen Contamination During Submerged Arc Wel ding of Titanium  

E-Print Network [OSTI]

) ) ) ··- -~ Oxygen and Nitroaen Contamination During Submerged Arc Wel ding of Titanium T· \\v· Eagar* The oxygen content of ti tanium submerged arc wel ~ metal is primaril y derendent uron the purity of the fluo1~ ide fluxes, but it is shown here that the oxygen content of the weld metal may be affected

Eagar, Thomas W.

403

Coupled motion of grain boundaries in bcc tungsten as a possible radiation-damage healing mechanism under fusion reactor conditions  

Science Journals Connector (OSTI)

As a potential first-wall fusion reactor material, tungsten will be subjected to high radiation flux and extreme mechanical stress. We propose that under these conditions, coupled grain boundary (GB) motion, in some cases enhanced by interstitial loading, can lead to a radiation-damage healing mechanism, in which a large stress activates coupled GB motion, and the GB sweeps up the defects, such as voids and vacancies, as it passes through the material. The stress-induced mobility characteristics of a number of GBs in tungsten are examined to investigate the likelihood of this scenario.

Valery Borovikov; Xian-Zhu Tang; Danny Perez; Xian-Ming Bai; Blas P. Uberuaga; Arthur F. Voter

2013-01-01T23:59:59.000Z

404

ARC Meeting: 12/9/2012 Present: Pushpa, Ed, Malvika, Meng Shuen, Julia, Matt Voss, Sandhya, Connor, VLS, Adam,  

E-Print Network [OSTI]

(academic vs. research vs. other electives)? Connor: Want to find out across major Pushpa: ARC would like

Low, Steven H.

405

Effect of micro-arc oxidation surface modification on the properties of the NiTi shape memory alloy  

Science Journals Connector (OSTI)

In this paper, the effects of micro-arc oxidation (MAO) surface modification (alumina coatings)...P < 0.05).

J. L. Xu; Z. C. Zhong; D. Z. Yu; F. Liu…

2012-12-01T23:59:59.000Z

406

Modelling Of Magnetic Channels For Micro-droplets Filtering And Tests Of Their Efficiency In UHV Arc-discharges  

E-Print Network [OSTI]

Modelling Of Magnetic Channels For Micro-droplets Filtering And Tests Of Their Efficiency In UHV Arc-discharges

Strzyzewski, P; Mirowski, R; Sadowski, M; Tazzari, S; Witkowski, J

2005-01-01T23:59:59.000Z

407

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

73,669 73,669 141,300 1.59 221,822 1.12 3 0.10 46,289 0.88 33,988 1.24 31,006 0.98 252,585 1.26 A r k a n s a s Arkansas 51. Summary Statistics for Natural Gas Arkansas, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 1,750 1,552 1,607 1,563 1,470 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 3,500 3,500 3,500 3,988 4,020 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 171,543 166,273 161,967 161,390 182,895 From Oil Wells ........................................... 39,364 38,279 33,446 33,979 41,551 Total.............................................................. 210,906 204,552 195,413 195,369 224,446 Repressuring ................................................

408

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

-1,080,240 -1,080,240 201,024 2.27 1,734,887 8.78 133 4.54 76,629 1.46 136,436 4.99 46,152 1.46 460,373 2.30 O k l a h o m a Oklahoma 84. Summary Statistics for Natural Gas Oklahoma, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 13,926 13,289 13,487 13,438 13,074 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 28,902 29,118 29,121 29,733 29,733 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 1,674,405 1,732,997 1,626,858 1,521,857 1,467,695 From Oil Wells ........................................... 342,950 316,945 308,006 289,877 267,192 Total.............................................................. 2,017,356 2,049,942 1,934,864

409

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

7,038,115 7,038,115 3,528,911 39.78 13,646,477 69.09 183 6.24 408,861 7.80 1,461,718 53.49 281,452 8.91 5,681,125 28.40 West South Central West South Central 42. Summary Statistics for Natural Gas West South Central, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 87,198 84,777 88,034 88,734 62,357 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 92,212 95,288 94,233 102,525 102,864 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 11,599,913 11,749,649 11,959,444 11,824,788 12,116,665 From Oil Wells ........................................... 2,313,831 2,368,395 2,308,634 2,217,752 2,151,247 Total..............................................................

410

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

77,379 77,379 94,481 1.07 81,435 0.41 8 0.27 70,232 1.34 1,836 0.07 40,972 1.30 207,529 1.04 K e n t u c k y Kentucky 65. Summary Statistics for Natural Gas Kentucky, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 1,084 1,003 969 1,044 983 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 12,483 12,836 13,036 13,311 13,501 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 79,690 86,966 73,081 74,754 81,435 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. 79,690 86,966 73,081 74,754 81,435 Repressuring ................................................

411

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

-67,648 -67,648 75,616 0.85 480,828 2.43 0 0.00 16,720 0.32 31,767 1.16 29,447 0.93 153,549 0.77 Pacific Noncontiguous Pacific Noncontiguous 45. Summary Statistics for Natural Gas Pacific Noncontiguous, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 9,638 9,907 9,733 9,497 9,294 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 112 113 104 100 102 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 198,603 190,139 180,639 179,470 183,747 From Oil Wells ........................................... 2,427,110 2,588,202 2,905,261 3,190,433 3,189,837 Total.............................................................. 2,625,713 2,778,341

412

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

-310,913 -310,913 110,294 1.24 712,796 3.61 2 0.07 85,376 1.63 22,607 0.83 57,229 1.81 275,508 1.38 K a n s a s Kansas 64. Summary Statistics for Natural Gas Kansas, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 9,681 9,348 9,156 8,571 7,694 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 18,400 19,472 19,365 22,020 21,388 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 580,572 605,578 628,900 636,582 629,755 From Oil Wells ........................................... 79,169 82,579 85,759 86,807 85,876 Total.............................................................. 659,741 688,157 714,659 723,389 715,631 Repressuring ................................................

413

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

819,046 819,046 347,043 3.91 245,740 1.24 40 1.36 399,522 7.62 32,559 1.19 201,390 6.38 980,555 4.90 M i c h i g a n Michigan 70. Summary Statistics for Natural Gas Michigan, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 1,223 1,160 1,323 1,294 2,061 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 3,257 5,500 6,000 5,258 5,826 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 120,287 126,179 136,989 146,320 201,123 From Oil Wells ........................................... 80,192 84,119 91,332 97,547 50,281 Total.............................................................. 200,479 210,299 228,321 243,867 251,404 Repressuring ................................................

414

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

W W y o m i n g -775,410 50,253 0.57 666,036 3.37 14 0.48 13,534 0.26 87 0.00 9,721 0.31 73,609 0.37 Wyoming 98. Summary Statistics for Natural Gas Wyoming, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 10,826 10,933 10,879 12,166 12,320 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 3,111 3,615 3,942 4,196 4,510 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 751,693 880,596 949,343 988,671 981,115 From Oil Wells ........................................... 285,125 142,006 121,519 111,442 109,434 Total.............................................................. 1,036,817 1,022,602 1,070,862 1,100,113 1,090,549 Repressuring

415

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

-67,648 -67,648 75,616 0.85 480,828 2.43 0 0.00 16,179 0.31 31,767 1.16 27,315 0.86 150,877 0.75 A l a s k a Alaska 49. Summary Statistics for Natural Gas Alaska, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 9,638 9,907 9,733 9,497 9,294 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 112 113 104 100 102 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 198,603 190,139 180,639 179,470 183,747 From Oil Wells ........................................... 2,427,110 2,588,202 2,905,261 3,190,433 3,189,837 Total.............................................................. 2,625,713 2,778,341 3,085,900 3,369,904 3,373,584 Repressuring

416

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

628,189 628,189 449,511 5.07 765,699 3.88 100 3.41 528,662 10.09 39,700 1.45 347,721 11.01 1,365,694 6.83 West North Central West North Central 39. Summary Statistics for Natural Gas West North Central, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 10,177 9,873 9,663 9,034 8,156 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 18,569 19,687 19,623 22,277 21,669 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 594,551 626,728 651,594 655,917 648,822 From Oil Wells ........................................... 133,335 135,565 136,468 134,776 133,390 Total.............................................................. 727,886 762,293

417

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

1,048,760 1,048,760 322,661 3.64 18,131 0.09 54 1.84 403,264 7.69 142,688 5.22 253,075 8.01 1,121,742 5.61 N e w Y o r k New York 80. Summary Statistics for Natural Gas New York, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 329 264 242 197 232 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 5,906 5,757 5,884 6,134 6,208 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 22,697 20,587 19,937 17,677 17,494 From Oil Wells ........................................... 824 610 539 723 641 Total.............................................................. 23,521 21,197 20,476 18,400 18,134 Repressuring ................................................

418

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

1,554,530 1,554,530 311,229 3.51 3,094,431 15.67 442 15.08 299,923 5.72 105,479 3.86 210,381 6.66 927,454 4.64 Mountain Mountain 43. Summary Statistics for Natural Gas Mountain, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 38,711 38,987 37,366 39,275 38,944 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 30,965 34,975 38,539 38,775 41,236 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 2,352,729 2,723,393 3,046,159 3,131,205 3,166,689 From Oil Wells ........................................... 677,771 535,884 472,397 503,986 505,903 Total.............................................................. 3,030,499 3,259,277 3,518,556

419

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

1,592,465 1,592,465 716,648 8.08 239,415 1.21 182 6.21 457,792 8.73 334,123 12.23 320,153 10.14 1,828,898 9.14 South Atlantic South Atlantic 40. Summary Statistics for Natural Gas South Atlantic, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 3,307 3,811 4,496 4,427 4,729 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 39,412 35,149 41,307 37,822 36,827 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 206,766 208,892 234,058 236,072 233,409 From Oil Wells ........................................... 7,584 8,011 8,468 7,133 6,706 Total.............................................................. 214,349 216,903 242,526 243,204 240,115

420

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

1,999,161 1,999,161 895,529 10.10 287,933 1.46 1,402 47.82 569,235 10.86 338,640 12.39 308,804 9.78 2,113,610 10.57 Pacific Contiguous Pacific Contiguous 44. Summary Statistics for Natural Gas Pacific Contiguous, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 3,896 3,781 3,572 3,508 2,082 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 1,142 1,110 1,280 1,014 996 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... 156,635 124,207 117,725 96,329 88,173 From Oil Wells ........................................... 294,800 285,162 282,227 289,430 313,581 Total.............................................................. 451,435 409,370

Note: This page contains sample records for the topic "gas tungsten arc" 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

Natural Gas  

Gasoline and Diesel Fuel Update (EIA)

-122,394 -122,394 49,997 0.56 178,984 0.91 5 0.17 37,390 0.71 205 0.01 28,025 0.89 115,622 0.58 West Virginia West Virginia 96. Summary Statistics for Natural Gas West Virginia, 1992-1996 Table 1992 1993 1994 1995 1996 Reserves (billion cubic feet) Estimated Proved Reserves (dry) as of December 31 ....................................... 2,356 2,439 2,565 2,499 2,703 Number of Gas and Gas Condensate Wells Producing at End of Year.............................. 38,250 33,716 39,830 36,144 35,148 Production (million cubic feet) Gross Withdrawals From Gas Wells ......................................... E 182,000 171,024 183,773 186,231 178,984 From Oil Wells ........................................... 0 0 0 0 0 Total.............................................................. E 182,000 171,024 183,773 186,231 178,984 Repressuring ................................................

422

Gas vesicles.  

Science Journals Connector (OSTI)

...the gas vesicles simply reduce their sinking rates and...remaining suspended in the water column. A microorganism...phenomena as stratification, water- bloom formation, and...the many proteins that make up the phycobilisome (73...flagellate bacteria in natural waters. The natural selection...

A E Walsby

1994-03-01T23:59:59.000Z

423

Gas vesicles.  

Science Journals Connector (OSTI)

...these costs can be compared is in units of energy expenditure per time (joules per second...requires 7.24 x 10-18 kg of Gvp. The energy cost of making this protein, Eg, is...Eg = 2.84 x 101- o J. The rate of energy expenditure in gas vesicle synthesis then...

A E Walsby

1994-03-01T23:59:59.000Z

424

Gas sensor  

DOE Patents [OSTI]

A gas sensor is described which incorporates a sensor stack comprising a first film layer of a ferromagnetic material, a spacer layer, and a second film layer of the ferromagnetic material. The first film layer is fabricated so that it exhibits a dependence of its magnetic anisotropy direction on the presence of a gas, That is, the orientation of the easy axis of magnetization will flip from out-of-plane to in-plane when the gas to be detected is present in sufficient concentration. By monitoring the change in resistance of the sensor stack when the orientation of the first layer's magnetization changes, and correlating that change with temperature one can determine both the identity and relative concentration of the detected gas. In one embodiment the stack sensor comprises a top ferromagnetic layer two mono layers thick of cobalt deposited upon a spacer layer of ruthenium, which in turn has a second layer of cobalt disposed on its other side, this second cobalt layer in contact with a programmable heater chip.

Schmid, Andreas K.; Mascaraque, Arantzazu; Santos, Benito; de la Figuera, Juan

2014-09-09T23:59:59.000Z

425

Tungsten Nanowire Based Hyperbolic Metamaterial Emitters for Near-field Thermophotovoltaic Applications  

E-Print Network [OSTI]

Recently, near-field radiative heat transfer enhancement across nanometer vacuum gaps has been intensively studied between two hyperbolic metamaterials (HMMs) due to unlimited wavevectors and high photonic density of state. In this work, we theoretically analyze the energy conversion performance of a thermophotovoltaic (TPV) cell made of In0.2Ga0.8Sb when paired with a HMM emitter composed of tungsten nanowire arrays embedded in Al2O3 host at nanometer vacuum gaps. Fluctuational electrodynamics integrated with effective medium theory and anisotropic thin-film optics is used to calculate the near-field radiative heat transfer. It is found that the spectral radiative energy is enhanced by the epsilon-near-zero and hyperbolic modes at different polarizations. As a result, the power output from a semi-infinite TPV cell is improved by 1.85 times with the nanowire HMM emitter over that with a plain tungsten emitter at a vacuum gap of 10 nm. Moreover, by using a thin TPV cell with 10 um thickness, the conversion eff...

Chang, Jui-Yung; Wang, Liping

2014-01-01T23:59:59.000Z

426

Five percent platinum-tungsten oxide-based electrocatalysts for phosphoric acid fuel cell cathodes  

SciTech Connect (OSTI)

A Pt-tungsten oxide-based electrocatalyst has been fabricated by an inexpensive chemical route for use as an oxygen cathode in 99% phosphoric acid at 180 C. The effect of %WO{sub 3} (wt/wt) on the Pt-tungsten oxide/C-based electrode performance was studied. The electrocatalytic properties for the oxygen reduction reaction (ORR), e.g., exchange current density and mass activity of a 5% Pt-40% WO{sub 3}-based electrode were found to be twice as high as those of 10% Pt, which contains double the amount of platinum. The Tafel slope and specific activity of the two electrodes are similar. It was shown that an increase in its electrochemically active surface area was the only reason for the performance of the 5% Pt-40% WO{sub 3}-based electrode. The electrocatalytic parameters of the 5% Pt-40% WO{sub 3}-based electrode for the ORR were compared to those of the 2% Pt-1% H{sub 2}WO{sub 4}-based electrode.

Savadogo, O.; Beck, P. [Ecole Polytechnique, Montreal, Quebec (Canada). Lab. d`Electrochimie et de Materiaux Energetiques

1996-12-01T23:59:59.000Z

427

Plasma Chemistry and Plasma Processing, Vol. 12, No.4, 1992 Infrared Radiation from an Arc Plasma and Its  

E-Print Network [OSTI]

of an atmospheric-pressure arc plasma are described from the viewpoint of continuorts radiation tlieory of the atmospheric arc plasma column is very sensitive to the electron density in the near infrared frequency rangeB ) Plasma Chemistry and Plasma Processing, Vol. 12, No.4, 1992 Infrared Radiation from an Arc

Eagar, Thomas W.

428

Comparative study of gel-based separated arc-discharge, HiPCO, and CoMoCAT carbon nanotubes  

E-Print Network [OSTI]

Nano Res 1 Comparative study of gel-based separated arc-discharge, HiPCO, and CoMoCAT carbon) Comparative Study of Gel-based Separated Arc-discharge, HiPCO, and CoMoCAT Carbon Nanotubes kinds of mainstream carbon nanotubes (arc-discharge, HiPCO, CoMoCAT) separated using low-cost gel

Zhou, Chongwu

429

Electroreduction of Oxygen in Polymer Electrolyte Fuel Cells by Activated Carbon Coated Cobalt Nanocrystallites Produced by Electric Arc Discharge  

Science Journals Connector (OSTI)

Electroreduction of Oxygen in Polymer Electrolyte Fuel Cells by Activated Carbon Coated Cobalt Nanocrystallites Produced by Electric Arc Discharge ... A recent review of the encapsulation of rare earth and iron group metals (Fe, Co, Ni) using electric arc discharge has been published by Saito. ... Nanotubes have been observed after activation of catalytically inactive carbon-coated Co nanocrystallites generated by electric arc discharge. ...

G. Lalande; D. Guay; J. P. Dodelet; S. A. Majetich; M. E. McHenry

1997-03-18T23:59:59.000Z

430

Presented in Concord, Merrimack and West Lebanon, NH by the UNHCE Geospatial Outreach Program ArcGIS Workshops Fall 2012  

E-Print Network [OSTI]

Drivers Permit 10 1-day, 9am to 4pm To be announced Topics covered: ArcGIS 10 Exploring GIS maps Basic GIS Lebanon, NH December 4-6, Merrimack, NH Topics covered: ArcGIS 10 Creating GIS maps GIS techniques GIS and applications, participants learn how to use ArcGIS 10 to produce effective maps, edit and create GIS data

New Hampshire, University of

431

Liquid Natural Gas  

Science Journals Connector (OSTI)

Liquid Natural Gas ... IN A new technique for storing natural gas at the East Ohio Gas Co. plant, Cleveland, Ohio, the gas is liquefied before passing to the gas holders. ... Natural gas contains moisture and carbon dioxide, both of which liquefy before the natural gas and are somewhat of a nuisance because upon solidification they clog the pipes. ...

W. F. SCHAPHORST

1941-04-25T23:59:59.000Z

432

Design study for wire and arc additive manufacture  

Science Journals Connector (OSTI)

Additive Manufacture (AM) is a technique whereby freeform structures are produced by building up material in a layer by layer fashion. Among the different AM processes, Wire and Arc Additive Manufacture (WAAM) has the ability to manufacture large custom-made metal workpiece with high efficiency. A design study has been performed to explore the process capabilities of fabricating complicated geometries using WAAM. Features such as enclosed structures, crossing structures, and balanced building structures have been investigated in this study. Finite Element (FE) models are employed to take the thermo-mechanical performance into account. Robot tool path design has been performed to transfer the WAAM component designs into real components efficiently. This paper covers these essential design steps from a technical as well as practical point of view.

Jörn Mehnen; Jialuo Ding; Helen Lockett; Panos Kazanas

2014-01-01T23:59:59.000Z

433

Method of operating a centrifugal plasma arc furnace  

DOE Patents [OSTI]

A centrifugal plasma arc furnace is used to vitrify contaminated soils and other waste materials. An assessment of the characteristics of the waste is performed prior to introducing the waste into the furnace. Based on the assessment, a predetermined amount of iron is added to each batch of waste. The waste is melted in an oxidizing atmosphere into a slag. The added iron is oxidized into Fe{sub 3}O{sub 4}. Time of exposure to oxygen is controlled so that the iron does not oxidize into Fe{sub 2}O{sub 3}. Slag in the furnace remains relatively non-viscous and consequently it pours out of the furnace readily. Cooled and solidified slag produced by the furnace is very resistant to groundwater leaching. The slag can be safely buried in the earth without fear of contaminating groundwater. 3 figs.

Kujawa, S.T.; Battleson, D.M.; Rademacher, E.L. Jr.; Cashell, P.V.; Filius, K.D.; Flannery, P.A.; Whitworth, C.G.

1998-03-24T23:59:59.000Z

434

Method of operating a centrifugal plasma arc furnace  

DOE Patents [OSTI]

A centrifugal plasma arc furnace is used to vitrify contaminated soils and other waste materials. An assessment of the characteristics of the waste is performed prior to introducing the waste into the furnace. Based on the assessment, a predetermined amount of iron is added to each batch of waste. The waste is melted in an oxidizing atmosphere into a slag. The added iron is oxidized into Fe.sub.3 O.sub.4. Time of exposure to oxygen is controlled so that the iron does not oxidize into Fe.sub.2 O.sub.3. Slag in the furnace remains relatively non-viscous and consequently it pours out of the furnace readily. Cooled and solidified slag produced by the furnace is very resistant to groundwater leaching. The slag can be safely buried in the earth without fear of contaminating groundwater.

Kujawa, Stephan T. (Butte, MT); Battleson, Daniel M. (Butte, MT); Rademacher, Jr., Edward L. (Butte, MT); Cashell, Patrick V. (Butte, MT); Filius, Krag D. (Butte, MT); Flannery, Philip A. (Ramsey, MT); Whitworth, Clarence G. (Butte, MT)

1998-01-01T23:59:59.000Z

435

(Data in metric tons of tungsten content, unless otherwise noted) Domestic Production and Use: The last recorded production of tungsten concentrates in the United States was in  

E-Print Network [OSTI]

and wear- resistant materials primarily in the metalworking, oil and gas drilling, mining, and construction--9-30-006 Uncommitted Committed Authorized Disposal plan Disposals Material inventory inventory

436

2566 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 36, NO. 5, OCTOBER 2008 Quantitative Analysis of Gas Circuit Breaker  

E-Print Network [OSTI]

, pressure waves. I. INTRODUCTION THE ARC zone of high-voltage self-blast gas circuit break- ers is challenging to diagnose directly due to the combina- tion of temperatures in the 30 000 K range and densities-mail: margarita.abrahamsson@ gmail.com). Digital Object Identifier 10.1109/TPS.2008.2004235 This paper

Basse, Nils Plesner

437

NATURAL GAS MARKET ASSESSMENT  

E-Print Network [OSTI]

CALIFORNIA ENERGY COMMISSION NATURAL GAS MARKET ASSESSMENT PRELIMINARY RESULTS In Support.................................................................................... 6 Chapter 2: Natural Gas Demand.................................................................................................. 10 Chapter 3: Natural Gas Supply

438

,"Missouri Natural Gas Summary"  

U.S. Energy Information Administration (EIA) Indexed Site

Gas Sold to Commercial Consumers (Dollars per Thousand Cubic Feet)","Missouri Natural Gas Industrial Price (Dollars per Thousand Cubic Feet)","Missouri Natural Gas Price Sold to...

439

Natural Gas Weekly Update  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

natural gas production output. Rigs Natural Gas Transportation Update Tennessee Gas Pipeline Company yesterday (August 4) said it is mobilizing equipment and manpower for...

440

Solution Processed Tungsten Oxide Interfacial Layer for Efficient Hole-Injection in Quantum Dot Light-Emitting Diodes  

E-Print Network [OSTI]

2/2014 Solution Processed Tungsten Oxide Interfacial Layer for Efficient Hole-Injection in Quantum Layer for Efficient Hole-Injection in Quantum Dot Light- Emitting Diodes Xuyong Yang, Evren Mutlugun-based devices, the organic interfacial buffer layers have inferior thermal stability. Efforts to replace PEDOT

Demir, Hilmi Volkan

Note: This page contains sample records for the topic "gas tungsten arc" 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

By Earle B. Amey Tungsten's unique high-temperature in Metal Bulletin (London). ferrotungsten, carbide powder blends, and  

E-Print Network [OSTI]

). ferrotungsten, carbide powder blends, and properties can be utilized advantageously in the As a result properties of its carbide continue to scrap, and sodium tungstate and away from the provide important items increased in all imported tungsten materials. the cemented carbide end-use sectors that A summary

442

In Situ Synthesized Economical Tungsten Dioxide Imbedded in Mesoporous Carbon for Dye-Sensitized Solar Cells As Counter Electrode Catalyst  

Science Journals Connector (OSTI)

In Situ Synthesized Economical Tungsten Dioxide Imbedded in Mesoporous Carbon for Dye-Sensitized Solar Cells As Counter Electrode Catalyst ... As a novel photovoltaic device to convert solar energy to electricity directly, dye-sensitized solar cells (DSCs) have developed considerably over the last 20 years. ...

Mingxing Wu; Xiao Lin; Liang Wang; Wei Guo; Yudi Wang; Jinqiu Xiao; Anders Hagfeldt; Tingli Ma

2011-09-26T23:59:59.000Z

443

Above: Power deposition in the superconducting magnets and the tungsten-carbide + water shield inside them, according to a  

E-Print Network [OSTI]

jet will disrupt the pool, unless mitigated by a splash suppressor. A SOLENOID CAPTURE SYSTEM Collider (MC) Comments Beam Power 4 MW No existing target system will survive at this power Ep 8 GeV yieldAbove: Power deposition in the superconducting magnets and the tungsten-carbide + water shield

McDonald, Kirk

444

Shale gas is natural gas trapped inside  

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

Shale gas is natural gas trapped inside formations of shale - fine grained sedimentary rocks that can be rich sources of petroleum and natural gas. Just a few years ago, much of...

445

Gas Chromatography  

Science Journals Connector (OSTI)

Researchers from the University of Missouri and ICx Nomadics have reported on the use of a optofluidic ring resonator (OFRR) sensor for on-column detection ?. ... Although substantial differences were noted between fresh and aged (or oxidized) oils, many of the compounds in the oxidized oil went unidentified due to lack of library mass spectral data. ... A high resolution MEMS based gas chromatography column for the analysis of benzene and toluene gaseous mixtures ...

Frank L. Dorman; Joshua J. Whiting; Jack W. Cochran; Jorge Gardea-Torresdey

2010-05-26T23:59:59.000Z

446

Characterization of an atmospheric double arc argon-nitrogen plasma source  

SciTech Connect (OSTI)

In the framework of studies devoted to hazardous waste destruction, an original dc double anode plasma torch has been designed and tested, which produces an elongated, weak fluctuation and reproducible plasma jet at atmospheric pressure. The arc instabilities and dynamic behavior of the double arc argon-nitrogen plasma jet are investigated through the oscillations of electrical signals by combined means of fast Fourier transform and Wigner distribution. In our experiment, the restrike mode is identified as the typical fluctuation behavior in an argon-nitrogen plasma jet. The Fourier spectra and Wigner distributions exhibit two characteristic frequencies of 150 Hz and 4.1 kHz, which reveals that the nature of fluctuations in the double arc argon-nitrogen plasma can be ascribed to the undulation of the power supply and both arc roots motion on the anode channels. In addition, the microscopic properties of the plasma jet inside and outside the arc chamber are investigated by means of optical emission spectroscopy, which yields excitation, electronic, rotational, and vibrational temperatures, as well as the electron number density. The results allow us to examine the validity criteria of a local thermodynamic equilibrium (LTE) state in the plasma arc. The measured electron densities are in good agreement with those calculated from the LTE model, which indicates that the atmospheric double arc argon-nitrogen plasma in the core region is close to the LTE state under our experimental conditions.

Tu, X. [State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027 (China); UMR 6614 CNRS CORIA, Saint Etienne du Rouvray 76801 (France); Cheron, B. G. [UMR 6614 CNRS CORIA, Saint Etienne du Rouvray 76801 (France); Yan, J. H.; Yu, L.; Cen, K. F. [State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027 (China)

2008-05-15T23:59:59.000Z

447

Creating dynamic equivalent PV circuit models with impedance spectroscopy for arc-fault modeling.  

SciTech Connect (OSTI)

Article 690.11 in the 2011 National Electrical Code{reg_sign} (NEC{reg_sign}) requires new photovoltaic (PV) systems on or penetrating a building to include a listed arc fault protection device. Currently there is little experimental or empirical research into the behavior of the arcing frequencies through PV components despite the potential for modules and other PV components to filter or attenuate arcing signatures that could render the arc detector ineffective. To model AC arcing signal propagation along PV strings, the well-studied DC diode models were found to inadequately capture the behavior of high frequency arcing signals. Instead dynamic equivalent circuit models of PV modules were required to describe the impedance for alternating currents in modules. The nonlinearities present in PV cells resulting from irradiance, temperature, frequency, and bias voltage variations make modeling these systems challenging. Linearized dynamic equivalent circuits were created for multiple PV module manufacturers and module technologies. The equivalent resistances and capacitances for the modules were determined using impedance spectroscopy with no bias voltage and no irradiance. The equivalent circuit model was employed to evaluate modules having irradiance conditions that could not be measured directly with the instrumentation. Although there was a wide range of circuit component values, the complex impedance model does not predict filtering of arc fault frequencies in PV strings for any irradiance level. Experimental results with no irradiance agree with the model and show nearly no attenuation for 1 Hz to 100 kHz input frequencies.

Johnson, Jay Dean; Kuszmaul, Scott S.; Strauch, Jason E.; Schoenwald, David Alan

2011-06-01T23:59:59.000Z

448

Arc discharge regulation of a megawatt hot cathode bucket ion source for the experimental advanced superconducting tokamak neutral beam injector  

SciTech Connect (OSTI)

Arc discharge of a hot cathode bucket ion source tends to be unstable what attributes to the filament self-heating and energetic electrons backstreaming from the accelerator. A regulation method, which based on the ion density measurement by a Langmuir probe, is employed for stable arc discharge operation and long pulse ion beam generation. Long pulse arc discharge of 100 s is obtained based on this regulation method of arc power. It establishes a foundation for the long pulse arc discharge of a megawatt ion source, which will be utilized a high power neutral beam injection device.

Xie Yahong; Hu Chundong; Liu Sheng; Jiang Caichao; Li Jun; Liang Lizhen [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China); Collaboration: NBI Team

2012-01-15T23:59:59.000Z

449

What we know and what we do not know about plasma arc cutting  

Science Journals Connector (OSTI)

After a brief history of plasma arc cutting (PAC) is given, its types and abilities are discussed. Experimental data (unfortunately, little is available) on plasma parameters are reviewed. The status of contemporary understanding of the process involved in PAC is presented. The main emphasis is on those processes that determine the technological abilities of the method. Along with the existing theories reviewed, we propose qualitative hypotheses on some of these processes. Among them are: dependence of the cyclic cathode erosion on the rate of current increase, double arcing and the role of insulating inclusions at the nozzle orifice on double arcing, dross formation and the shape of the kerf.

V A Nemchinsky; W S Severance

2006-01-01T23:59:59.000Z

450

Arc Detection and Interlock Module for the PEP II Low Level RF System  

SciTech Connect (OSTI)

A new arc detection and interlock generating module for the SLAC PEP-II low-level RF VXI-based system has been developed. The system is required to turn off the RF drive and high voltage power supply in the event of arcing in the cavity windows, klystron window, or circulator. Infrared photodiodes receive arc signals through radiation resistant optical fibers. Gain and bandwidth are selectable for each channel to allow tailoring response. The module also responds to interlock requests from other modules in the VXI system and communicates with the programmable logic controller (PLC) responsible for much of the low-level RF system's interlock functionality.

Tighe, R.; /SLAC

2011-08-31T23:59:59.000Z

451

A comparative numerical study of hybrid-stabilized argon–water electric arc  

Science Journals Connector (OSTI)

The paper presents numerical simulations of the discharge and the near-outlet regions of the hybrid-stabilized argon–water electric arc. Two different numerical methods for solving the set of conservative equations for the continuity, momentum and energy have been applied. The major difference between the results using the two methods occurs in the temperature distribution in arc fringes within the discharge chamber. This fact influences the potential drop, overpressure, reabsorption of radiation and arc efficiency. It is shown that the radial profiles of temperature at the exit nozzle are less influenced by different temperature distribution within the discharge chamber. Comparison with chosen experimental temperature profiles shows very good agreement.

Ji?í Jeništa; Hidemasa Takana; Hideya Nishiyama; Milada Bartlová; Vladimír Aubrecht; Petr K?enek; Viktor Sember; Alan Mašláni

2011-01-01T23:59:59.000Z

452

Modeling And Measurements Of The Arc Plasma In A Mixture Of Gases  

SciTech Connect (OSTI)

Radial distributions of Ar mass fractions and temperatures in plasmas produced in a wall-stabilized arc have been calculated. Modeling have been performed for many different mixtures of Ar+N2 and three different arc currents. The obtained results show that the radial distributions of Ar mass fractions strongly depend on the chemical composition of the plasma. In plasmas containing large amount of Ar the distributions have local minima at the arc axis (in high temperature plasma regions), whereas in plasmas consisting mainly of nitrogen the distributions reveal maxima on the discharge axis. Those features seem to be connected with the dissociation of the nitrogen.

Pawelec, E.; KsiaPzek, I. [University of Opole, Oleska 48, Opole (Poland)

2006-01-15T23:59:59.000Z

453

Technical manual, redesigned ARC-2A automatic radon counter. Final report  

SciTech Connect (OSTI)

The ARC-2A Automatic Radon Counter (Serial No. 87003) was manufactured in 1987 by Ocean Communication Systems, Inc, Panama City, Florida. It was designed as a stand-alone system, but was consistently plagued with problems. The manufacturer could not repair the machine. The ARC-2A was completely redesigned at NCCOSC RDT and E Division. It is now interfaced to a computer. A new manual was written with updated information and user instructions. The ARC-2A is an integral part of ongoing electro-optic propagation studies.... Radon, Electro-optics, Aerosol.

Littfin, K.M.

1992-09-01T23:59:59.000Z

454

Gas Sampling Considerations  

Science Journals Connector (OSTI)

Gas sampling is carried out to measure the quality of a gas. Gas samples are sometimes acquired by in situ observation within the main gas body by using remote or visual observation for specific properties. A mor...

Alvin Lieberman

1992-01-01T23:59:59.000Z

455

Georgia Tech Dangerous Gas  

E-Print Network [OSTI]

1 Georgia Tech Dangerous Gas Safety Program March 2011 #12;Georgia Tech Dangerous Gas Safety.......................................................................................................... 5 6. DANGEROUS GAS USAGE REQUIREMENTS................................................. 7 6.1. RESTRICTED PURCHASE/ACQUISITION RULES: ................................................ 7 7. FLAMMABLE GAS

Sherrill, David

456

Market Digest: Natural Gas  

Reports and Publications (EIA)

The Energy Information Administration's Natural Gas Market Digest provides information and analyses on all aspects of natural gas markets.

2014-01-01T23:59:59.000Z

457

Thermal Gradient Holes At Tungsten Mountain Area (Kratt, Et Al., 2008) |  

Open Energy Info (EERE)

Kratt, Et Al., 2008) Kratt, Et Al., 2008) Exploration Activity Details Location Tungsten Mountain Area Exploration Technique Thermal Gradient Holes Activity Date Usefulness useful DOE-funding Unknown Notes twenty-three gold exploration holes were drilled by Newcrest Resources, Inc. during 2005 and 2006 along the range front. These holes approached or exceeded 300 m in depth and all holes encountered hot water and/or steam. Despite the high temperatures encountered at relatively shallow depths, there are no active geothermal features such as hot springs or steam vents at the surface. The presence of small outcrops of argillic alteration containing anomalous gold attracted the interest of exploration geologists. References Christopher Kratt, Mark Coolbaugh, Chris Sladek, Rick Zehner, Robin

458

On vapor shielding of dust grains of iron, molybdenum, and tungsten in fusion plasmas  

SciTech Connect (OSTI)

The shielding effects of ablation cloud around a small dust grain composed of iron, molybdenum, or tungsten in fusion plasmas are considered. These include collisional dissipation of momentum flux of impinging plasma ions, heat transfer by secondary plasma created due to electron impact ionization of the ablated atoms, and radiative plasma power losses in the ablation cloud. The maximum radius, which limits applicability of existing dust-plasma interaction models neglecting the cloud shielding effects, for dust grains of the considered high-Z metals is calculated as function of plasma parameters. The thermal bifurcation triggered by thermionic electron emission from dust grains, observed for some of the considered materials, is analyzed. The results are compared with previous calculations for dust composed of low-Z fusion related materials, i.e., lithium, beryllium, and carbon.

Brown, B. T.; Smirnov, R. D., E-mail: rsmirnov@ucsd.edu; Krasheninnikov, S. I. [Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093-0411 (United States)] [Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093-0411 (United States)

2014-02-15T23:59:59.000Z

459

Fabrication of ultrafine tungsten-based alloy powders by novel soda reduction process  

SciTech Connect (OSTI)

A novel reduction method has been developed to fabricate ultrafine tungsten heavy alloy powders, with ammonium metatungstate (AMT), iron(II) chloride tetrahydrate (FeCl{sub 2}.4H{sub 2}O), nickel(II) chloride hexahydrate (NiCl{sub 2}.6H{sub 2}O) as source materials and sodium tungstate dihydrate (Na{sub 2}WO{sub 4}.2H{sub 2}O) as a reductant. In the preparation of mixtures the amounts of the source components were chosen so as to obtain alloy of 93W-5Ni-2Fe composition (wt.%). The obtained powders were characterized by X-ray diffraction, XPS, field-emission scanning microscope (FESEM), and chemical composition was analyzed by EDX.

Lee, Dong-Won [Powder Technology Research Group, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam, 641-010 (Korea, Republic of)] [Powder Technology Research Group, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam, 641-010 (Korea, Republic of); Turaev, Farkhod, E-mail: farkhod_2002@yahoo.com [Powder Technology Research Group, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam, 641-010 (Korea, Republic of)] [Powder Technology Research Group, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam, 641-010 (Korea, Republic of); Kim, Ju-Hyeong [Powder Technology Research Group, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam, 641-010 (Korea, Republic of)] [Powder Technology Research Group, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam, 641-010 (Korea, Republic of); Yang, Mingchuan [W-base Heavy Alloy Research Group, Institute of Metal Research (IMR), 72 Wenhua-road, Shenyang, 110016 (China)] [W-base Heavy Alloy Research Group, Institute of Metal Research (IMR), 72 Wenhua-road, Shenyang, 110016 (China)

2010-03-15T23:59:59.000Z

460

A study of tungsten nanopowder formation by self-propagating high-temperature synthesis  

SciTech Connect (OSTI)

Molten salt-assisted self-propagating high-temperature synthesis of nanocrystalline W powder was studied experimentally. The technique involves the reduction of WO{sub 3} in the presence of sodium chloride using three different reducing agents: magnesium (Mg), sodium azide (NaN{sub 3}), and sodium borohydride (NaBH{sub 4}). The effects of the mole fraction of sodium chloride on temperature distributions, combustion parameters, phase compositions, and morphology of the final products were determined. The sodium chloride-assisted method reported here has been found to be effective for lowering combustion temperature and producing uniform and spherical W nanopowders of average particle size around 20-200, 100-200, and 20-50 nm. The effect of combustion temperature on tungsten particle size is discussed, and a sketch describing the chemistry of combustion is proposed.

Nersisyan, H.H.; Won, C.W. [Rapidly Solidified Materials Research Center, Chungnam National University, 220 Gung-Dong, Yuseong, Daejeon 305-764 (Korea, Republic of); Lee, J.H. [Korea Atomic Energy Research Institute (KAERI), 150 Duckjin-Dong, Yuseong, Daejeon 305-353 (Korea, Republic of)

2005-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas tungsten arc" 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

Gas Chromatography  

Science Journals Connector (OSTI)

He received his B.S. degree in 1970 from Rhodes College in Memphis, TN, his M.S. degree in 1973 from the University of Missouri, Columbia, MO, and his Ph.D. degree in 1975 from Dalhousie University, Halifax, Nova Scotia, Canada. ... A review (with 145 references) on the role of carrier gases on the separation process (A4) demonstrates that carrier gas interactions are integral to the chromatographic process. ... In another report, activity coefficients for refrigerants were evaluated with a polyol ester oil stationary phase (C22). ...

Gary A. Eiceman; Herbert H. Hill, Jr.; Jorge Gardea-Torresdey

2000-04-25T23:59:59.000Z

462

238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc  

Open Energy Info (EERE)

238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc 238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: 238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc Details Activities (0) Areas (0) Regions (0) Abstract: Activities of 238U decay series radioisotopes have been determined for both postcaldera basalts erupted between 1849 and 1974 and genetically related young precaldera dacites from Batur volcano, Bali, Sunda arc. All rocks possess (230Th/238U) = 1 within 2 sigma error indicating that little, if any, fractionation between Th and U occurred during their genesis, or in their source regions, within approximately the last 350 ka. Both the basaltic and the dacitic rocks possess (230Th/232U) ~

463

An Archean Oceanic Felsic Dyke Swarm In A Nascent Arc- The Hunter Mine  

Open Energy Info (EERE)

Oceanic Felsic Dyke Swarm In A Nascent Arc- The Hunter Mine Oceanic Felsic Dyke Swarm In A Nascent Arc- The Hunter Mine Group, Abitibi Greenstone Belt, Canada Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: An Archean Oceanic Felsic Dyke Swarm In A Nascent Arc- The Hunter Mine Group, Abitibi Greenstone Belt, Canada Details Activities (0) Areas (0) Regions (0) Abstract: The 2730-Ma-old Hunter Mine Group (HMG), a dominantly felsic subaqueous volcanic sequence, was formed during early arc construction in the Abitibi greenstone belt (Quebec, Canada). The western part of the HMG contains a felsic dyke swarm up to 1.5 km wide and traceable up-section for 2.5 km. Five distinct generations were identified: (1) aphanitic to feldspar-phyric dykes; (2) quartz-feldspar-phyric dykes with < 5% quartz

464

Surface Modification of Smectite Clay Induced by Non-thermal Gliding Arc Plasma at Atmospheric Pressure  

Science Journals Connector (OSTI)

Smectite clay from Sabga (west-Cameroon) was treated in aqueous suspension by gliding arc plasma to modify its surface properties. The evolution of the modifications was followed with the exposure time and pos...

Antoine Tiya Djowe; Samuel Laminsi…

2013-08-01T23:59:59.000Z

465

The Consumption of Carbon in the Electric Arc. No. III. The Anode Loss  

Science Journals Connector (OSTI)

1 February 1916 research-article The Consumption of Carbon in the Electric Arc. No. III. The Anode Loss W. G. Duffield Mary D. Waller The Royal Society is collaborating with...

1916-01-01T23:59:59.000Z

466

Novel Direct Steelmaking by Combining Microwave, Electric Arc, and Exothermal Heating Technologies  

Broader source: Energy.gov [DOE]

This factsheet describes a project to develop direct steelmaking through the combination of microwave, electric arc, and exothermal heating, a process which is meant to eliminate traditional, intermediate steelmaking steps.

467

UPb and geochemical evidence for a Cryogenian magmatic arc in central Novaya Zemlya, Arctic Russia  

E-Print Network [OSTI]

U­Pb and geochemical evidence for a Cryogenian magmatic arc in central Novaya Zemlya, Arctic Russia-0349 Oslo, Norway Introduction The High Arctic of Scandinavia and Russia consists of a collage

Svensen, Henrik

468

E-Print Network 3.0 - arc welding robot Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

robot Search Powered by Explorit Topic List Advanced Search Sample search results for: arc welding robot Page: << < 1 2 3 4 5 > >> 1 ORIGINAL ARTICLE Development of a mobile...

469

E-Print Network 3.0 - ac electric arc Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: ac electric arc Page: << < 1 2 3 4 5 > >> 1 The response of the azimuthal component of the...

470

Microstructure and Properties of Nanostructured Calcium Phosphate/Titania Porous Coatings via Micro Arc Oxidation  

Science Journals Connector (OSTI)

Crystalline Calcium Phosphate-TiO2 nanostructured porous layers were fabricated via micro arc oxidation technique under different times to investigate how...2 inner layer during the MAO growth. Based on XRD patte...

Sakine Abbasi; Hamid Reza Rezaie…

2013-01-01T23:59:59.000Z

471

Improving the System Life of Basic Oxygen and Electric Arc Furnace Hoods, Roofs, and Side Vents  

Broader source: Energy.gov [DOE]

This factsheet describes the benefits of a high-performance aluminum bronze alloy to basic oxygen furnace and electric arc furnace components such as hoods, roofs, and side vents.

472

Quick surface treatment of AZ31B by AC micro-arc oxidation  

Science Journals Connector (OSTI)

In order to explore an effective way to shorten treatment time and enhance the quality of treatment coating, AC micro-arc oxidation was conducted to treat the surface of ... KF+KOH treatment solution. The influen...

Shenglin Wang ???; Peng Zhang ??; Yunhui Du…

2014-08-01T23:59:59.000Z

473

Kinetics and Properties of Micro Arc Oxidation Coatings Deposited on Commercial Al Alloys  

Science Journals Connector (OSTI)

The micro arc oxidation (MAO) technique is being increasingly recognized...6Si2O13 (mullite) is observed to form. With increasing Si content, the corresponding mullite phase also increases. Increasing mullite con...

L. Rama krishna; A. Sudha Purnima…

2007-02-01T23:59:59.000Z

474

Microstructure and corrosion resistance of ultrasonic micro-arc oxidation biocoatings on magnesium alloy  

Science Journals Connector (OSTI)

The ultrasonic micro-arc oxidation (UMAO) was used to fabricate ceramic ... showed that ultrasound improved the homogeneous distribution of micro-porous structure. The coatings were mainly composed...

Lijie Qu; Muqin Li; Miao Liu; Erlin Zhang; Chen Ma

2013-09-01T23:59:59.000Z

475

Simulation of hardened layer formation at micro-arc oxidation of aluminum specimens  

Science Journals Connector (OSTI)

In this paper, some model representations on a process of hardened surface layer formation are presented; they were developed on the basis of the analysis of physical processes that occur in the course of micro-arc

N. Yu. Dudareva

2008-09-01T23:59:59.000Z

476

A parameter design of CNC plasma-arc cutting of carbon steel plates using robust design  

Science Journals Connector (OSTI)

An optimisation of the cutting parameters during CNC plasma-arc cutting of St37 mild steel plates is attempted using robust design. The process parameters tested were plate thickness, cutting speed, arc ampere, arc voltage, air pressure, pierce height, and torch standoff distance. An orthogonal matrix experiment [L18 (21 × 37) ] was conducted and the right bevel angle was measured and optimised according to the process parameters using an analysis of means and an analysis of variances. The results show that the arc ampere has an effect mainly on the bevel angle (50.89%), while the plate thickness and torch standoff distance also have an influence of 6.22 and 15.9% respectively. The other parameters have an F factor smaller than one, and thus their variations do not significantly affect the bevel angle in the experimental region. Finally, an additive model was applied on the experimental results to predict the optimum combination and was compared with actual values.

John Kechagias; Michael Billis; Stergios Maropoulos

2010-01-01T23:59:59.000Z

477

Carbon nanostructures production by AC arc discharge plasma process at atmospheric pressure  

Science Journals Connector (OSTI)

Carbon nanostructures have received much attention for a wide range of applications. In this paper, we produced carbon nanostructures by decomposition of benzene using AC arc discharge plasma process at atmospheric pressure. Discharge was carried out ...

Shenqiang Zhao; Ruoyu Hong; Zhi Luo; Haifeng Lu; Biao Yan

2011-01-01T23:59:59.000Z

478

Explosive electron emission and the portion model of the electric arc  

Science Journals Connector (OSTI)

Some parameters and dependences characteristic of the electric arc phenomenon had no satisfactory explanation for a ... number of important ideas in the physics of electric discharges. At a meeting of the RAS Pre...

Gennadii Andreevich Mesyats

2014-07-01T23:59:59.000Z

479

Computation of electric-arc parameters taking account of convective and radiant losses  

Science Journals Connector (OSTI)

An approximate solution of the problem of an electrical arc in a turbulent argon stream is obtained, taking into account convective and radiant energy losses in the discharge channel at atmospheric pressure.

N. A. Zyrichev

1971-10-01T23:59:59.000Z

480

Obtaining Carbon Nanoparticles with the Use of Electric?Arc Discharge between Coaxial Electrodes  

Science Journals Connector (OSTI)

The structure of a setup and the results of experiments on obtaining carbon nanostructures with the use of a d.c. arc discharge between coaxial graphite electrodes have been presented. The discharge was stabil...

V. V. Chuprasov; M. S. Tret'yak…

Note: This page contains sample records for the topic "gas tungsten arc" 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.


481

Investigation of condensed products of graphite evaporation in an electric arc in argon and helium atmosphere  

Science Journals Connector (OSTI)

The composition of products formed in the discharge chamber at the synthesis of nanostructures by arc discharge was investigated. The fullerene soot obtained in an argon atmosphere was shown to contain at leas...

V. I. Podgornyi; S. D. Kushch; A. N. Yakovlev…

2011-02-01T23:59:59.000Z

482

Ethanol and E85 Reforming Assisted by a Non-thermal Arc Discharge  

Science Journals Connector (OSTI)

Ethanol and E85 Reforming Assisted by a Non-thermal Arc Discharge ... The input electric power is expressed in terms of the percentage of Qfuel·LHVfuel, and is noted as %LHV. ... for electricity prodn. ...

Guillaume Petitpas; José Gonzalez-Aguilar; Adeline Darmon; Laurent Fulcheri

2010-03-25T23:59:59.000Z

483

Studies on erosion of silicone rubber exposed to partial arc discharges  

Science Journals Connector (OSTI)

The effect of electrolyte conductivity on the partial arc discharge development between two electrolyte electrodes on a silicone rubber sheet surface was investigated. Tests were executed by placing the salt-waterlogged glass-filter paper on a silicone rubber sheet to simulate a polluted electrolyte layer, and partial arc discharges with a constant current value of 10 mA were observed. It was found that the formation of an arc channel and a temperature distribution on the sample surface varied with the electrolyte conductivity. In addition, the relation between the electrolyte conductivity and the weight loss due to the heat erosion of specimens was also investigated by a 3D morphological observation and a simulated calculation. The partial arc discharge did significantly not influence on the sample surface erosion under serious polluted conditions. In contrast, the severest erosion appeared under the light pollution with comparatively lower conductivity of the electrolyte electrodes.

Kenichi Haji; Yong Zhu; Masahisa Otsubo; Tatsuya Sakoda

2008-01-01T23:59:59.000Z

484

The stability and the conditions for initiation of electric-arc discharges in railguns  

Science Journals Connector (OSTI)

Characteristic physical features of plasma formations in high-velocity sliding electric contacts are treated, in particular, those in railguns with both electric-arc and metal armatures. Comparison is made of ...

A. P. Glinov

2007-04-01T23:59:59.000Z

485

Application of electrostatic Langmuir probe to atmospheric arc plasmas producing nanostructures  

SciTech Connect (OSTI)

The temporal evolution of a high pressure He arc producing nanotubes was considered and the Langmuir probe technique was applied for plasma parameter measurements. Two modes of arc were observed: cathodic arc where discharge is supported by erosion of cathode material and anodic arc which is supported by ablation of the anode packed with carbon and metallic catalysts in which carbon nanotubes are synthesized. Voltage-current (V-I) characteristics of single probes were measured and unusually low ratio of saturation current on positively biased probe to that on negatively biased of about 1-4 was observed. This effect was explained by increase of measured current at the negatively biased probe above the level of ion saturation current due to secondary electron emission from the probe surface. Since utilization of standard collisionless approach to determine plasma parameters from the measured V-I characteristic is not correct, the electron saturation current was used to estimate the plasma density.

Shashurin, A.; Li, J.; Zhuang, T.; Keidar, M. [Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, George Washington University, Washington, District of Columbia 20052 (United States); Beilis, I. I. [School of Electrical Engineering, Tel Aviv University, Ramat Aviv 69978 (Israel)

2011-07-15T23:59:59.000Z

486

Numerical Investigation of the Effect of the Cathode Geometry on the Characteristics of an Electric Arc  

Science Journals Connector (OSTI)

The effect of the cathode geometry on the characteristics of an electric arc is treated. It is found that the characteristics of plasma in discharges with cathodes of different geometry (cone, ... . It is assumed...

R. M. Urusov; T. E. Urusova

487

A cascaded photonic crystal fiber Mach–Zehnder interferometer formed by extra electric arc discharges  

Science Journals Connector (OSTI)

In this paper, a cascaded Mach–Zehnder interferometer based on a photonic crystal fiber is reported. It is demonstrated that by applying a small dose of extra arc discharge to the photonic crystal fiber sensin...

Y. Geng; X. Li; X. Tan; Y. Deng; Y. Yu

2011-03-01T23:59:59.000Z

488

Two-dimensional kinetic model of short high-current vacuum-arc discharge  

Science Journals Connector (OSTI)

A two-dimensional mathematical model of a short high-current vacuum-arc discharge is developed, according to which magnetized electrons ... a free flight regime in a two-dimensional electric field. The proposed m...

Ya. I. Londer; K. N. Ul’yanov

2010-03-01T23:59:59.000Z

489

The current-voltage characteristic of a hot-cathode electric arc at low pressures  

Science Journals Connector (OSTI)

It has been shown that in a hot-cathode electric arc operating at low pressures of the working ... drop arises that results in an increase in discharge voltage with current even before the transition of the discharge

C. P. Nikulin

2011-03-01T23:59:59.000Z

490

Super-conducting niobium films produced by means of UHV arc  

Science Journals Connector (OSTI)

The paper shows that high-quality super-conducting Nb films can be deposited by means of arc discharges under ultra-high vacuum conditions. The critical temperatureT c...of Nb-films obtained with ...

J. Langner; M. J. Sadowski; K. Czaus; R. Mirowski…

2004-03-01T23:59:59.000Z

491

E-Print Network 3.0 - arc energy limiting Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

energy limiting Page: << < 1 2 3 4 5 > >> 1 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 50, NO. 3, JUNE 2001 697 Robust Sensing of Arc Length Summary: the...

492

Controlling electrode gap during vacuum arc remelting at low melting current  

DOE Patents [OSTI]

An apparatus and method are disclosed for controlling electrode gap in a vacuum arc remelting furnace, particularly at low melting currents. Spectrographic analysis is performed of the metal vapor plasma, from which estimates of electrode gap are derived. 5 figs.

Williamson, R.L.; Zanner, F.J.; Grose, S.M.

1997-04-15T23:59:59.000Z

493

E-Print Network 3.0 - assisted plasma arc Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Groupe d'Optique Atomique Collection: Physics 8 Gliding arc in tornado using a reverse vortex flow Chiranjeev S. Kalra, Young I. Cho,a Summary: . Instead the ignition was plasma...

494

E-Print Network 3.0 - arc discharge effects Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

de mathmatiques Collection: Mathematics 5 Gliding arc in tornado using a reverse vortex flow Chiranjeev S. Kalra, Young I. Cho,a Summary: nonequilib- rium plasma is to use...

495

E-Print Network 3.0 - arc discharge ion Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Texas at Austin Collection: Engineering 8 Gliding arc in tornado using a reverse vortex flow Chiranjeev S. Kalra, Young I. Cho,a Summary: nonequilib- rium plasma is to use...

496

Method for fabricating wrought components for high-temperature gas-cooled reactors and product  

DOE Patents [OSTI]

A method and alloys for fabricating wrought components of a high-temperature gas-cooled reactor are disclosed. These wrought, nickel-based alloys, which exhibit strength and excellent resistance to carburization at elevated temperatures, include aluminum and titanium in amounts and ratios to promote the growth of carburization resistant films while preserving the wrought character of the alloys. These alloys also include substantial amounts of molybdenum and/or tungsten as solid-solution strengtheners. Chromium may be included in concentrations less than 10% to assist in fabrication. Minor amounts of carbon and one or more carbide-forming metals also contribute to high-temperature strength.

Thompson, Larry D. (San Diego, CA); Johnson, Jr., William R. (San Diego, CA)

1985-01-01T23:59:59.000Z

497

Effect of Microstructure on Mechanical Properties of High Strength Steel Weld Metals  

E-Print Network [OSTI]

using for example gas tungsten arc welding (GTAW). However as strength levels increase it becomes more difficult to fulfil impact toughness requirements with flexible and productive welding methods such as shielded metal arc welding (SMAW), flux cored... . Little effects are seen on the cross sectional area of each weld bead deposited with increase in interpass temperature but the proportion of recrystallised area increases [12]. By eliminating the columnar microstructure, hardness becomes more uniform...

Keehan, Enda

2004-01-01T23:59:59.000Z

498

Comparative Study on the Electronic Structure of Arc-Discharge and Catalytic Carbon Nanotubes  

Science Journals Connector (OSTI)

Comparative Study on the Electronic Structure of Arc-Discharge and Catalytic Carbon Nanotubes ... A perfect nanotube may be thought of as a cylindrical graphene sheet composed only of hexagons with a few pentagonal rings needed to close the tips.1 The typical carbon nanotubes formed under high temperature conditions, which can be induced by an electric arc for example, are predominantly straight having the largest numbers of topological defects at their ends. ...

L. G. Bulusheva; A. V. Okotrub; I. P. Asanov; A. Fonseca; J. B. Nagy

2001-05-05T23:59:59.000Z

499

Three Stages Modeling of n-Octane Reforming Assisted by a Nonthermal Arc Discharge  

Science Journals Connector (OSTI)

Three Stages Modeling of n-Octane Reforming Assisted by a Nonthermal Arc Discharge ... After a description of the model and its main assumptions, a parametric analysis of plasma reformer performance addressing the influence of plasma volume, H2O/C ratio, O/C ratio, and input electric power is presented. ... Most of them were particularly dealt with technologies based on arc discharges. ...

José Gonzalez-Aguilar; Guillaume Petitpas; Alexandre Lebouvier; Jean-Damien Rollier; Adeline Darmon; Laurent Fulcheri

2009-09-08T23:59:59.000Z

500

A study of the precursor effect in an arc-driven shock tube  

E-Print Network [OSTI]

the electrical arc discharge voltage used. Here the predominant precursor source has been found to be photoionization. These studies generally used micro- wave diagnostic equipment. Theoretical results so far have been divided between photoionization... the electrical arc discharge voltage used. Here the predominant precursor source has been found to be photoionization. These studies generally used micro- wave diagnostic equipment. Theoretical results so far have been divided between photoionization...

Reed, James Alan

2012-06-07T23:59:59.000Z