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Note: This page contains sample records for the topic "junction compressor station" 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
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1

Computational Optimization of Gas Compressor Stations: MINLP ...  

E-Print Network [OSTI]

Feb 26, 2015 ... Abstract: When considering cost-optimal operation of gas transport networks, compressor stations play the most important role. Proper ...

Daniel Rose

2015-02-26T23:59:59.000Z

2

Control optimization of the cryoplant warm compressor station for EAST  

SciTech Connect (OSTI)

The cryogenic control system for EAST (Experimental Advanced Superconducting Tokamak) was designed based on DeltaV DCS of Emerson Corporation. The automatic control of the cryoplant warm compressors has been implemented. However, with ever-degrading performance of critical equipment, the cryoplant operation in the partial design conditions makes the control system fluctuate and unstable. In this paper, the warm compressor control system was optimized to eliminate the pressure oscillation based on the expert PID theory.

Zhuang, M.; Hu, L. B.; Zhou, Z. W.; Xia, G. H. [Cryogenic Engineering Division, Institute of Plasma Physics Chinese Academy of Sciences, P.O.Box 1126,Shushanhu Road 350, Hefei, Anhui 230031 (China)

2014-01-29T23:59:59.000Z

3

Natural Gas Compressor Stations on the Interstate Pipeline Network: Developments Since 1996  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia,(Million Barrels) Crude Oil Reserves in Nonproducing Reservoirs Year2per6.48 6.18 5.63 4.73Feet)Compressor Stations

4

National Account Energy Alliance Final Report for the Basin Electric Project at Northern Border Pipeline Company's Compressor Station #7, North Dakota  

SciTech Connect (OSTI)

A field research test and verification project was conducted at the recovered energy generation plant at Northern Border Pipeline Company Compressor Station #7 (CS#7) near St. Anthony. Recovered energy generation plant equipment was supplied and installed by ORMAT Technologies, Inc. Basin Electric is purchasing the electricity under a purchase power agreement with an ORMAT subsidiary, which owns and operates the plant.

Sweetzer, Richard [Exergy Partners Corp.; Leslie, Neil [Gas Technology Institute

2008-02-01T23:59:59.000Z

5

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

vs. delivered hydrogen, compressor type, storage pressure).pump High-pressure hydrogen compressor Compressed hydrogenpipeline High-pressure hydrogen compressor Pipeline Station:

Weinert, Jonathan X.; Lipman, Timothy

2006-01-01T23:59:59.000Z

6

Supersonic compressor  

DOE Patents [OSTI]

A gas compressor based on the use of a driven rotor having an axially oriented compression ramp traveling at a local supersonic inlet velocity (based on the combination of inlet gas velocity and tangential speed of the ramp) which forms a supersonic shockwave axially, between adjacent strakes. In using this method to compress inlet gas, the supersonic compressor efficiently achieves high compression ratios while utilizing a compact, stabilized gasdynamic flow path. Operated at supersonic speeds, the inlet stabilizes an oblique/normal shock system in the gasdyanamic flow path formed between the gas compression ramp on a strake, the shock capture lip on the adjacent strake, and captures the resultant pressure within the stationary external housing while providing a diffuser downstream of the compression ramp.

Lawlor, Shawn P. (Bellevue, WA); Novaresi, Mark A. (San Diego, CA); Cornelius, Charles C. (Kirkland, WA)

2008-02-26T23:59:59.000Z

7

Electrochemical Hydrogen Compressor  

SciTech Connect (OSTI)

The Electrochemical Hydrogen Compressor EHC was evaluated against DOE applications for compressing hydrogen at automobile filling stations, in future hydrogen pipelines and as a commercial replacement for conventional diaphragm hydrogen compressors. It was also evaluated as a modular replacement for the compressors used in petrochemical refineries. If the EHC can be made inexpensive, reliable and long lived then it can satisfy all these applications save pipelines where the requirements for platinum catalyst exceeds the annual world production. The research performed did not completely investigate Molybdenum as a hydrogen anode or cathode, it did show that photoetched 316 stainless steel is inadequate for an EHC. It also showed that: molybdenum bipolar plates, photochemical etching processes, and Gortex Teflon seals are too costly for a commercial EHC. The use of carbon paper in combination with a perforated thin metal electrode demonstrated adequate anode support strength, but is suspect in promoting galvanic corrosion. The nature of the corrosion mechanisms are not well understood, but locally high potentials within the unit cell package are probably involved. The program produced a design with an extraordinary high cell pitch, and a very low part count. This is one of the promising aspects of the redesigned EHC. The development and successful demonstration of the hydraulic cathode is also important. The problem of corrosion resistant metal bipolar plates is vital to the development of an inexpensive, commercial PEM fuel cell. Our research suggests that there is more to the corrosion process in fuel cells and electrochemical compressors than simple, steady state, galvanic stability. It is an important area for scientific investigation. The experiments and analysis conducted lead to several recommended future research directions. First, we need a better understanding of the corrosion mechanisms involved. The diagnosis of experimental cells with titration to determine the loss of membrane active sites is recommended. We suspect that the corrosion includes more than simple galvanic mechanisms. The mechanisms involved in this phenomenon are poorly understood. Shunt currents at hydraulic cathode ports were problematic, but are not difficult to cure. In addition to corrosion there is evidence of high component resistivity. This may be due to the deposition of organic compounds, which may be produced electrochemically on the surface of the metal support screens that contact carbon gas diffusion layers (GDLs) or catalyst supports. An investigation of possible electro-organic sythesis mechanisms with emphasis on oxalates formation is warranted. The contaminated cell parts can be placed in an oxidizing atmosphere at high temperature and the weight loss can be observed. This would reveal the existence of organic compounds. Investigation into the effects of conductivity enhancers such as carbon microlayers on supporting carbon paper is also needed. Corrosion solutions should be investigated such as surface passivation of 316 SS parts using nitric acid. Ultra thin silane/siloxane polymer coatings should be tried. These may be especially useful in conjunction with metal felt replacement of carbon paper. A simple cure for the very high, localized corrosion of the anode might be to diffusion bond the metal electrode support screen to bipolar plate. This will insure uniform resistance perpendicular to the plane of the cell and eliminate some of the dependence of the resistance on high stack compression. Alternative materials should be explored. Alternatives to carbon in the cell may be helpful in any context. In particular, alternatives to carbon paper GDLs such as metal felts and alternatives to carbon supports for Pt such as TiC and TiB2 might also be worthwhile and would be helpful to fuel cells as well. Some alternative to the metals we used in the cell, Mo and 316 SS, are potentially useful. These include Al/Mg/Si alloys. Corrosion resistant materials such as Nb and Mo might prove useful as cladding materials that can be hot stamp

David P. Bloomfield; Brian S. MacKenzie

2006-05-01T23:59:59.000Z

8

Recirculating rotary gas compressor  

DOE Patents [OSTI]

A positive displacement, recirculating Roots-type rotary gas compressor is described which operates on the basis of flow work compression. The compressor includes a pair of large diameter recirculation conduits which return compressed discharge gas to the compressor housing, where it is mixed with low pressure inlet gas, thereby minimizing adiabatic heating of the gas. The compressor includes a pair of involutely lobed impellers and an associated port configuration which together result in uninterrupted flow of recirculation gas. The large diameter recirculation conduits equalize gas flow velocities within the compressor and minimize gas flow losses. The compressor is particularly suited to applications requiring sustained operation at higher gas compression ratios than have previously been feasible with rotary pumps, and is particularly applicable to refrigeration or other applications requiring condensation of a vapor. 12 figs.

Weinbrecht, J.F.

1992-02-25T23:59:59.000Z

9

Recirculating rotary gas compressor  

DOE Patents [OSTI]

A positive displacement, recirculating Roots-type rotary gas compressor which operates on the basis of flow work compression. The compressor includes a pair of large diameter recirculation conduits (24 and 26) which return compressed discharge gas to the compressor housing (14), where it is mixed with low pressure inlet gas, thereby minimizing adiabatic heating of the gas. The compressor includes a pair of involutely lobed impellers (10 and 12) and an associated port configuration which together result in uninterrupted flow of recirculation gas. The large diameter recirculation conduits equalize gas flow velocities within the compressor and minimize gas flow losses. The compressor is particularly suited to applications requiring sustained operation at higher gas compression ratios than have previously been feasible with rotary pumps, and is particularly applicable to refrigeration or other applications requiring condensation of a vapor.

Weinbrecht, John F. (601 Oakwood Loop, NE., Albuquerque, NM 87123)

1992-01-01T23:59:59.000Z

10

High ratio recirculating gas compressor  

DOE Patents [OSTI]

A high ratio positive displacement recirculating rotary compressor is disclosed. The compressor includes an integral heat exchanger and recirculation conduits for returning cooled, high pressure discharge gas to the compressor housing to reducing heating of the compressor and enable higher pressure ratios to be sustained. The compressor features a recirculation system which results in continuous and uninterrupted flow of recirculation gas to the compressor with no direct leakage to either the discharge port or the intake port of the compressor, resulting in a capability of higher sustained pressure ratios without overheating of the compressor. 10 figs.

Weinbrecht, J.F.

1989-08-22T23:59:59.000Z

11

Supersonic gas compressor  

DOE Patents [OSTI]

A gas compressor based on the use of a driven rotor having a compression ramp traveling at a local supersonic inlet velocity (based on the combination of inlet gas velocity and tangential speed of the ramp) which compresses inlet gas against a stationary sidewall. In using this method to compress inlet gas, the supersonic compressor efficiently achieves high compression ratios while utilizing a compact, stabilized gasdynamic flow path. Operated at supersonic speeds, the inlet stabilizes an oblique/normal shock system in the gasdyanamic flow path formed between the rim of the rotor, the strakes, and a stationary external housing. Part load efficiency is enhanced by the use of a pre-swirl compressor, and using a bypass stream to bleed a portion of the intermediate pressure gas after passing through the pre-swirl compressor back to the inlet of the pre-swirl compressor. Inlet guide vanes to the compression ramp enhance overall efficiency.

Lawlor, Shawn P. (Bellevue, WA); Novaresi, Mark A. (San Diego, CA); Cornelius, Charles C. (Kirkland, WA)

2007-11-13T23:59:59.000Z

12

Danfoss Commercial Compressors October 2013 | 2 Inverter compressors  

E-Print Network [OSTI]

#12;Danfoss Commercial Compressors October 2013 | 2 Inverter compressors Geothermal energy taps to improve heat pump efficiency : compressor technology focus Efficiency boost in Ground Source Heat Pump-sized or require additional electrical heaters #12;Danfoss Commercial Compressors October 2013 | 6 What difference

Oak Ridge National Laboratory

13

Standing wave compressor  

DOE Patents [OSTI]

A compressor for compression-evaporation cooling systems, which requires no moving parts. A gaseous refrigerant inside a chamber is acoustically compressed and conveyed by means of a standing acoustic wave which is set up in the gaseous refrigerant. This standing acoustic wave can be driven either by a transducer, or by direct exposure of the gas to microwave and infrared sources, including solar energy. Input and output ports arranged along the chamber provide for the intake and discharge of the gaseous refrigerant. These ports can be provided with optional valve arrangements, so as to increase the compressor's pressure differential. The performance of the compressor in either of its transducer or electromagnetically driven configurations, can be optimized by a controlling circuit. This controlling circuit holds the wavelength of the standing acoustical wave constant, by changing the driving frequency in response to varying operating conditions.

Lucas, Timothy S. (4614 River Mill Ct., Glen Allen, VA 23060)

1991-01-01T23:59:59.000Z

14

HELIUM COMPRESSOR MONITORING SYSTEM Donna Kubik  

E-Print Network [OSTI]

Compressor #9 Connectors Compressor #10 Connectors Compressor #11 Connector (LEDs) LED Timer and LED PowerHELIUM COMPRESSOR MONITORING SYSTEM Donna Kubik Arecibo Observatory #12;1 CONTENTS 1. Design goals 3 1.1 Features of the compressor monitoring system 4 2. EDAS: The basis of data acquisition 5 2

15

Nanotube junctions  

DOE Patents [OSTI]

The present invention comprises a new nanoscale metal-semiconductor, semiconductor-semiconductor, or metal-metal junction, designed by introducing topological or chemical defects in the atomic structure of the nanotube. Nanotubes comprising adjacent sections having differing electrical properties are described. These nanotubes can be constructed from combinations of carbon, boron, nitrogen and other elements. The nanotube can be designed having different indices on either side of a junction point in a continuous tube so that the electrical properties on either side of the junction vary in a useful fashion. For example, the inventive nanotube may be electrically conducting on one side of a junction and semiconducting on the other side. An example of a semiconductor-metal junction is a Schottky barrier. Alternatively, the nanotube may exhibit different semiconductor properties on either side of the junction. Nanotubes containing heterojunctions, Schottky barriers, and metal-metal junctions are useful for microcircuitry.

Crespi, Vincent Henry (Darien, IL); Cohen, Marvin Lou (Berkeley, CA); Louie, Steven Gwon Sheng (Berkeley, CA); Zettl, Alexander Karlwalter (Kensington, CA)

2003-01-01T23:59:59.000Z

16

Light intensity compressor  

DOE Patents [OSTI]

In a system for recording images having vastly differing light intensities over the face of the image, a light intensity compressor is provided that utilizes the properties of twisted nematic liquid crystals to compress the image intensity. A photoconductor or photodiode material that is responsive to the wavelength of radiation being recorded is placed adjacent a layer of twisted nematic liquid crystal material. An electric potential applied to a pair of electrodes that are disposed outside of the liquid crystal/photoconductor arrangement to provide an electric field in the vicinity of the liquid crystal material. The electrodes are substantially transparent to the form of radiation being recorded. A pair of crossed polarizers are provided on opposite sides of the liquid crystal. The front polarizer linearly polarizes the light, while the back polarizer cooperates with the front polarizer and the liquid crystal material to compress the intensity of a viewed scene. Light incident upon the intensity compressor activates the photoconductor in proportion to the intensity of the light, thereby varying the field applied to the liquid crystal. The increased field causes the liquid crystal to have less of a twisting effect on the incident linearly polarized light, which will cause an increased percentage of the light to be absorbed by the back polarizer. The intensity of an image may be compressed by forming an image on the light intensity compressor.

Rushford, Michael C. (Livermore, CA)

1990-01-01T23:59:59.000Z

17

Advanced Hybrid Water Heater using Electrochemical Compressor...  

Energy Savers [EERE]

Advanced Hybrid Water Heater using Electrochemical Compressor Advanced Hybrid Water Heater using Electrochemical Compressor Xergy is using its Electro Chemical Compression (ECC)...

18

Josephson junction  

SciTech Connect (OSTI)

A novel method for fabricating nanometer geometry electronic devices is described. Such Josephson junctions can be accurately and reproducibly manufactured employing photolithographic and direct write electron beam lithography techniques in combination with aqueous etchants. In particular, a method is described for manufacturing planar Josephson junctions from high temperature superconducting material.

Wendt, Joel R. (Albuquerque, NM); Plut, Thomas A. (Albuquerque, NM); Martens, Jon S. (Sunnyvale, CA)

1995-01-01T23:59:59.000Z

19

Josephson junction  

SciTech Connect (OSTI)

A novel method for fabricating nanometer geometry electronic devices is described. Such Josephson junctions can be accurately and reproducibly manufactured employing photolithographic and direct write electron beam lithography techniques in combination with aqueous etchants. In particular, a method is described for manufacturing planar Josephson junctions from high temperature superconducting material. 10 figs.

Wendt, J.R.; Plut, T.A.; Martens, J.S.

1995-05-02T23:59:59.000Z

20

Conserve Energy by Optimizing Air Compressor System  

E-Print Network [OSTI]

is the compressed air plant(s), cating air compressors with one 60-hp and one 30-hp which many times include compressors, ancillary screw compressor; (2) the repiping of the existing equipment, and/or an operating sequence that is screw compressors cooling water...

Williams, V. A.

Note: This page contains sample records for the topic "junction compressor station" 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

Dual capacity reciprocating compressor  

DOE Patents [OSTI]

A multi-cylinder compressor particularly useful in connection with northern climate heat pumps and in which different capacities are available in accordance with reversing motor rotation is provided with an eccentric cam on a crank pin under a fraction of the connecting rods, and arranged for rotation upon the crank pin between opposite positions 180[degree] apart so that with cam rotation on the crank pin such that the crank throw is at its normal maximum value all pistons pump at full capacity, and with rotation of the crank shaft in the opposite direction the cam moves to a circumferential position on the crank pin such that the overall crank throw is zero. Pistons whose connecting rods ride on a crank pin without a cam pump their normal rate with either crank rotational direction. Thus a small clearance volume is provided for any piston that moves when in either capacity mode of operation. 6 figs.

Wolfe, R.W.

1984-10-30T23:59:59.000Z

22

Dual capacity reciprocating compressor  

DOE Patents [OSTI]

A multi-cylinder compressor 10 particularly useful in connection with northern climate heat pumps and in which different capacities are available in accordance with reversing motor 16 rotation is provided with an eccentric cam 38 on a crank pin 34 under a fraction of the connecting rods, and arranged for rotation upon the crank pin between opposite positions 180.degree. apart so that with cam rotation on the crank pin such that the crank throw is at its normal maximum value all pistons pump at full capacity, and with rotation of the crank shaft in the opposite direction the cam moves to a circumferential position on the crank pin such that the overall crank throw is zero. Pistons 24 whose connecting rods 30 ride on a crank pin 36 without a cam pump their normal rate with either crank rotational direction. Thus a small clearance volume is provided for any piston that moves when in either capacity mode of operation.

Wolfe, Robert W. (Wilkinsburg, PA)

1984-01-01T23:59:59.000Z

23

Free piston inertia compressor  

DOE Patents [OSTI]

A free piston inertia compressor comprises a piston assembly including a connecting rod having pistons on both ends, the cylinder being split into two substantially identical portions by a seal through which the connecting rod passes. Vents in the cylinder wall are provided near the seal to permit gas to excape the cylinder until the piston covers the vent whereupon the remaining gas in the cylinder functions as a gas spring and cushions the piston against impact on the seal. The connecting rod has a central portion of relatively small diameter providing free play of the connecting rod through the seal and end portions of relatively large diameter providing a limited tolerance between the connecting rod and the seal. Finally, the seal comprises a seal ring assembly consisting of a dampener plate, a free floating seal at the center of the dampener plate and a seal retainer plate in one face of the dampener plate.

Richards, William D. C. (King of Prussia, PA); Bilodeau, Denis (Phoenixville, PA); Marusak, Thomas (Loudenville, NY); Dutram, Jr., Leonard (Trappe, PA); Brady, Joseph (Telford, PA)

1981-01-01T23:59:59.000Z

24

Free piston inertia compressor  

SciTech Connect (OSTI)

A free piston inertia compressor comprises a piston assembly including a connecting rod having pistons on both ends, the cylinder being split into two substantially identical portions by a seal through which the connecting rod passes. Vents in the cylinder wall are provided near the seal to permit gas to excape the cylinder until the piston covers the vent whereupon the remaining gas in the cylinder functions as a gas spring and cushions the piston against impact on the seal. The connecting rod has a central portion of relatively small diameter providing free play of the connecting rod through the seal and end portions of relatively large diameter providing a limited tolerance between the connecting rod and the seal. Finally, the seal comprises a seal ring assembly consisting of a dampener plate, a free floating seal at the center of the dampener plate and a seal retainer plate in one face of the dampener plate.

Bilodeau, D.; Brady, J.; Dutram, L.J.; Marusak, T.; Richards, W.D.

1981-12-29T23:59:59.000Z

25

Semi-active compressor valve  

DOE Patents [OSTI]

A method and system for fine-tuning the motion of suction or discharge valves associated with cylinders of a reciprocating gas compressor, such as the large compressors used for natural gas transmission. The valve's primary driving force is conventional, but the valve also uses an electromagnetic coil to sense position of the plate (or other plugging element) and to provide an opposing force prior to impact.

Brun, Klaus (Helotes, TX); Gernentz, Ryan S. (San Antonio, TX)

2010-07-27T23:59:59.000Z

26

Suction muffler for refrigeration compressor  

DOE Patents [OSTI]

A hermetic refrigeration compressor includes a suction muffler formed from two pieces of plastic material mounted on the cylinder housing. One piece is cylindrical in shape with an end wall having an aperture for receiving a suction tube connected to the cylinder head. The other piece fits over and covers the other end of the cylindrical piece, and includes a flaring entrance horn which extends toward the return line on the sidewall of the compressor shell. 5 figs.

Nelson, R.T.; Middleton, M.G.

1983-01-25T23:59:59.000Z

27

Compressor bleed cooling fluid feed system  

DOE Patents [OSTI]

A compressor bleed cooling fluid feed system for a turbine engine for directing cooling fluids from a compressor to a turbine airfoil cooling system to supply cooling fluids to one or more airfoils of a rotor assembly is disclosed. The compressor bleed cooling fluid feed system may enable cooling fluids to be exhausted from a compressor exhaust plenum through a downstream compressor bleed collection chamber and into the turbine airfoil cooling system. As such, the suction created in the compressor exhaust plenum mitigates boundary layer growth along the inner surface while providing flow of cooling fluids to the turbine airfoils.

Donahoo, Eric E; Ross, Christopher W

2014-11-25T23:59:59.000Z

28

The State of the Industrial Compressor Market  

E-Print Network [OSTI]

The industrial compressor industry in the United States has been operating in a textbook example of a mature market. No truly new compressor technology has been introduced in the past thirty years and there is none on the horizon. Competitive...

Perry, W.

29

Water injected fuel cell system compressor  

DOE Patents [OSTI]

A fuel cell system including a dry compressor for pressurizing air supplied to the cathode side of the fuel cell. An injector sprays a controlled amount of water on to the compressor's rotor(s) to improve the energy efficiency of the compressor. The amount of water sprayed out the rotor(s) is controlled relative to the mass flow rate of air inputted to the compressor.

Siepierski, James S. (Williamsville, NY); Moore, Barbara S. (Victor, NY); Hoch, Martin Monroe (Webster, NY)

2001-01-01T23:59:59.000Z

30

Note: Synchronous energy extraction through four output ports of microwave compressor  

SciTech Connect (OSTI)

The energy stored in a resonant cavity was extracted through four output ports and added in phase in a common line. Operation of a single switch provided synchronism and the power portions transmitted through the ports were combined in a waveguide turnstile junction. Estimation shows that the compressor peak power can reach a value eight times as much as the switched wave power, provided the output pulsewidth is shortened by the same factor with reference to the cavity double transit time. The performance of the X-band compressor prototype was investigated. Signals radiated through each of four output ports had identical envelope shapes and equal peak power values. The reflected wave did not accompany the power combining. The pulses of 1.2 MW peak power and 1.6 ns pulse width were obtained when the compressor was driven by the 50 kW pulse power magnetron generator.

Avgustinovich, V. A.; Artemenko, S. N.; Novikov, S. A.; Yushkov, Yu. G. [Tomsk Polytechnic University, 2-a Lenina, Tomsk 634050 (Russian Federation)

2013-06-15T23:59:59.000Z

31

Multiple volume compressor for hot gas engine  

DOE Patents [OSTI]

A multiple volume compressor for use in a hot gas (Stirling) engine having a plurality of different volume chambers arranged to pump down the engine when decreased power is called for and return the working gas to a storage tank or reservoir. A valve actuated bypass loop is placed over each chamber which can be opened to return gas discharged from the chamber back to the inlet thereto. By selectively actuating the bypass valves, a number of different compressor capacities can be attained without changing compressor speed whereby the capacity of the compressor can be matched to the power available from the engine which is used to drive the compressor.

Stotts, Robert E. (Clifton Park, NY)

1986-01-01T23:59:59.000Z

32

Preliminary design of centrifugal compressors  

SciTech Connect (OSTI)

Preliminary design calculations are analyzed for a centrifugal compressor, after choosing as the type of the turbomachine from the curves given by Balje (1981). In impeller calculations, the effect of slip factor on exit conditions, the inducer geometry and the effect of choked flow on relative Mach number are investigated. In discharge calculation vaned diffusers are compared with vaneless diffusers.

Kocak, S. [Selcuk Univ., Konya (Turkey). Dept. of Mechanical Engineering

1996-11-01T23:59:59.000Z

33

Optimization of compression and storage requirements at hydrogen refueling stations.  

SciTech Connect (OSTI)

The transition to hydrogen-powered vehicles requires detailed technical and economic analyses of all aspects of hydrogen infrastructure, including refueling stations. The cost of such stations is a major contributor to the delivered cost of hydrogen. Hydrogen refueling stations require not only dispensers to transfer fuel onto a vehicle, but also an array of such ancillary equipment as a cascade charging system, storage vessels, compressors and/or pumps/evaporators. This paper provides detailed information on design requirements for gaseous and liquid hydrogen refueling stations and their associated capital and operating costs, which in turn impact hydrogen selling price at various levels of hydrogen demand. It summarizes an engineering economics approach which captures the effect of variations in station size, seasonal, daily and hourly demand, and alternative dispensing rates and pressures on station cost. Tradeoffs in the capacity of refueling station compressors, storage vessels, and the cascade charging system result in many possible configurations for the station. Total costs can be minimized by optimizing that configuration. Using a methodology to iterate among the costs of compression, storage and cascade charging, it was found that the optimum hourly capacity of the compressor is approximately twice the station's average hourly demand, and the optimum capacity of the cascade charging system is approximately 15% of the station's average daily demand. Further, for an hourly demand profile typical of today's gasoline stations, onsite hydrogen storage equivalent to at least 1/3 of the station's average daily demand is needed to accommodate peak demand.

Elgowainy, A.; Mintz, M.; Kelly, B.; Hooks, M.; Paster, M. (Energy Systems); (Nexant, Inc.); (TIAX LLC)

2008-01-01T23:59:59.000Z

34

HERA-B GAS HUT: Mixing stations OTR: 4,2 x 1,2 m  

E-Print Network [OSTI]

HERA-B GAS HUT: Mixing stations OTR: 4,2 x 1,2 m MUON tube + pad: 3,0 x 1,2 m 80 MUON pixel: 1,2x1 gas bottles Detector.xls(Gas hut) Page 1 J. Spengler 20.08.1997 #12;The compressors will be installed purifiers 2 compressors 1 compressors 1 spare 1 gas separator 1 7 spare 0,5 5 Muon tube MFC's + steering

35

Oil cooled, hermetic refrigerant compressor  

DOE Patents [OSTI]

A hermetic refrigerant compressor having an electric motor and compressor assembly in a hermetic shell is cooled by oil which is first cooled in an external cooler 18 and is then delivered through the shell to the top of the motor rotor 24 where most of it is flung radially outwardly within the confined space provided by the cap 50 which channels the flow of most of the oil around the top of the stator 26 and then out to a multiplicity of holes 52 to flow down to the sump and provide further cooling of the motor and compressor. Part of the oil descends internally of the motor to the annular chamber 58 to provide oil cooling of the lower part of the motor, with this oil exiting through vent hole 62 also to the sump. Suction gas with entrained oil and liquid refrigerant therein is delivered to an oil separator 68 from which the suction gas passes by a confined path in pipe 66 to the suction plenum 64 and the separated oil drops from the separator to the sump. By providing the oil cooling of the parts, the suction gas is not used for cooling purposes and accordingly increase in superheat is substantially avoided in the passage of the suction gas through the shell to the suction plenum 64.

English, William A. (Murrysville, PA); Young, Robert R. (Murrysville, PA)

1985-01-01T23:59:59.000Z

36

Oil cooled, hermetic refrigerant compressor  

DOE Patents [OSTI]

A hermetic refrigerant compressor having an electric motor and compressor assembly in a hermetic shell is cooled by oil which is first cooled in an external cooler and is then delivered through the shell to the top of the motor rotor where most of it is flung radially outwardly within the confined space provided by the cap which channels the flow of most of the oil around the top of the stator and then out to a multiplicity of holes to flow down to the sump and provide further cooling of the motor and compressor. Part of the oil descends internally of the motor to the annular chamber to provide oil cooling of the lower part of the motor, with this oil exiting through vent hole also to the sump. Suction gas with entrained oil and liquid refrigerant therein is delivered to an oil separator from which the suction gas passes by a confined path in pipe to the suction plenum and the separated oil drops from the separator to the sump. By providing the oil cooling of the parts, the suction gas is not used for cooling purposes and accordingly increase in superheat is substantially avoided in the passage of the suction gas through the shell to the suction plenum. 3 figs.

English, W.A.; Young, R.R.

1985-05-14T23:59:59.000Z

37

Metering Air Compressor Systems for Efficiency: A Progress Report  

E-Print Network [OSTI]

Air compressors have energy efficiency quantified as SCFM/BHP. However, this efficiency fluctuates over a broad range based on the loading of the compressor. When multiple compressors operate with varying loads, as in a central plant, the overall...

Joseph, B.

2005-01-01T23:59:59.000Z

38

axial flow compressors: Topics by E-print Network  

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

compressor performance Peraire, Jaime 126 FEASIBILITY OF SOLAR-FIRED, COMPRESSOR-ASSISTED Energy Storage, Conversion and Utilization Websites Summary: FEASIBILITY OF...

39

axial flow compressor: Topics by E-print Network  

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

compressor performance Peraire, Jaime 126 FEASIBILITY OF SOLAR-FIRED, COMPRESSOR-ASSISTED Energy Storage, Conversion and Utilization Websites Summary: FEASIBILITY OF...

40

Refrigeration system having standing wave compressor  

DOE Patents [OSTI]

A compression-evaporation refrigeration system, wherein gaseous compression of the refrigerant is provided by a standing wave compressor. The standing wave compressor is modified so as to provide a separate subcooling system for the refrigerant, so that efficiency losses due to flashing are reduced. Subcooling occurs when heat exchange is provided between the refrigerant and a heat pumping surface, which is exposed to the standing acoustic wave within the standing wave compressor. A variable capacity and variable discharge pressure for the standing wave compressor is provided. A control circuit simultaneously varies the capacity and discharge pressure in response to changing operating conditions, thereby maintaining the minimum discharge pressure needed for condensation to occur at any time. Thus, the power consumption of the standing wave compressor is reduced and system efficiency is improved.

Lucas, Timothy S. (Glen Allen, VA)

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Compressor ported shroud for foil bearing cooling  

DOE Patents [OSTI]

A compressor ported shroud takes compressed air from the shroud of the compressor before it is completely compressed and delivers it to foil bearings. The compressed air has a lower pressure and temperature than compressed outlet air. The lower temperature of the air means that less air needs to be bled off from the compressor to cool the foil bearings. This increases the overall system efficiency due to the reduced mass flow requirements of the lower temperature air. By taking the air at a lower pressure, less work is lost compressing the bearing cooling air.

Elpern, David G. (Los Angeles, CA); McCabe, Niall (Torrance, CA); Gee, Mark (South Pasadena, CA)

2011-08-02T23:59:59.000Z

42

Holographic Josephson Junctions  

SciTech Connect (OSTI)

We construct a gravitational dual of a Josephson junction. Calculations on the gravity side reproduce the standard relation between the current across the junction and the phase difference of the condensate. We also study the dependence of the maximum current on the temperature and size of the junction and reproduce familiar results.

Horowitz, Gary T.; Santos, Jorge E.; Way, Benson [Department of Physics, University of California, Santa Barbara, California 93106-4030 (United States)

2011-06-03T23:59:59.000Z

43

A Holographic Josephson Junction  

E-Print Network [OSTI]

We construct a gravitational dual of a Josephson junction. Calculations on the gravity side reproduce the standard relation between the current across the junction and the phase difference of the condensate. We also study the dependence of the maximum current on the temperature and size of the junction and reproduce familiar results.

Gary T. Horowitz; Jorge E. Santos; Benson Way

2012-02-23T23:59:59.000Z

44

A methodology for centrifugal compressor stability prediction  

E-Print Network [OSTI]

The stable operation of centrifugal compressors is limited by well-known phenomena, rotating stall and surge. Although the manifestation of the full scale instabilities is similar to the ones observed in axial machines, ...

Benneke, Björn

2009-01-01T23:59:59.000Z

45

Method and apparatus for starting supersonic compressors  

DOE Patents [OSTI]

A supersonic gas compressor with bleed gas collectors, and a method of starting the compressor. The compressor includes aerodynamic duct(s) situated for rotary movement in a casing. The aerodynamic duct(s) generate a plurality of oblique shock waves for efficiently compressing a gas at supersonic conditions. A convergent inlet is provided adjacent to a bleed gas collector, and during startup of the compressor, bypass gas is removed from the convergent inlet via the bleed gas collector, to enable supersonic shock stabilization. Once the oblique shocks are stabilized at a selected inlet relative Mach number and pressure ratio, the bleed of bypass gas from the convergent inlet via the bypass gas collectors is effectively eliminated.

Lawlor, Shawn P

2013-08-06T23:59:59.000Z

46

Improved return passages for multistage centrifugal compressors  

E-Print Network [OSTI]

This thesis presents a design concept for return passages in multistage centrifugal compressors. Flow in a baseline return passage is analyzed to identify loss sources that have substantial potential for reduction. For the ...

Glass, Benjamin W., S.M. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

47

Economics of Electric Compressors for Gas Transmission  

E-Print Network [OSTI]

) option. Outside of these regions, new electric drives as well as gas fueled reciprocating engines and turbines are being considered for replacement of older reciprocating gas engines and compressor units, based on improved operating efficiency. We review...

Schmeal, W. R.; Hibbs, J. J.

48

Probabilistic analysis of meanline compressor rotor performance  

E-Print Network [OSTI]

This thesis addresses variability in aerodynamic performance of a compressor rotor due to geometric variation. The performance of the rotor is computed using a meanline model that includes the effect of tip clearance ...

Fitzgerald, Nathan Andrew, 1980-

2004-01-01T23:59:59.000Z

49

Probabilistic aerothermal design of compressor airfoils  

E-Print Network [OSTI]

Despite the generally accepted notion that geometric variability is undesirable in turbomachinery airfoils, little is known in detail about its impact on aerothermal compressor performance. In this work, statistical and ...

Garzón, Víctor E., 1972-

2003-01-01T23:59:59.000Z

50

Hydrogen pipeline compressors annual progress report.  

SciTech Connect (OSTI)

The objectives are: (1) develop advanced materials and coatings for hydrogen pipeline compressors; (2) achieve greater reliability, greater efficiency, and lower capital in vestment and maintenance costs in hydrogen pipeline compressors; and (3) research existing and novel hydrogen compression technologies that can improve reliability, eliminate contamination, and reduce cost. Compressors are critical components used in the production and delivery of hydrogen. Current reciprocating compressors used for pipeline delivery of hydrogen are costly, are subject to excessive wear, have poor reliability, and often require the use of lubricants that can contaminate the hydrogen (used in fuel cells). Duplicate compressors may be required to assure availability. The primary objective of this project is to identify, and develop as required, advanced materials and coatings that can achieve the friction, wear, and reliability requirements for dynamically loaded components (seal and bearings) in high-temperature, high-pressure hydrogen environments prototypical of pipeline and forecourt compressor systems. The DOE Strategic Directions for Hydrogen Delivery Workshop identified critical needs in the development of advanced hydrogen compressors - notably, the need to minimize moving parts and to address wear through new designs (centrifugal, linear, guided rotor, and electrochemical) and improved compressor materials. The DOE is supporting several compressor design studies on hydrogen pipeline compression specifically addressing oil-free designs that demonstrate compression in the 0-500 psig to 800-1200 psig range with significant improvements in efficiency, contamination, and reliability/durability. One of the designs by Mohawk Innovative Technologies Inc. (MiTi{reg_sign}) involves using oil-free foil bearings and seals in a centrifual compressor, and MiTi{reg_sign} identified the development of bearings, seals, and oil-free tribological coatings as crucial to the successful development of an advanced compressor. MiTi{reg_sign} and ANL have developed potential coatings for these rigorous applications; however, the performance of these coatings (as well as the nickel-alloy substrates) in high-temperature, high-speed hydrogen environments is unknown at this point.

Fenske, G. R.; Erck, R. A. (Energy Systems)

2011-07-15T23:59:59.000Z

51

Hydrogen refueling station costs in Shanghai  

E-Print Network [OSTI]

High-pressure hydrogen compressor Compressed hydrogenapplies to hydrogen storage vessels and compressors. 2.4.4.vehicles. 3. Compressor: compresses hydrogen gas to achieve

Weinert, Jonathan X.; Shaojun, Liu; Ogden, Joan M; Jianxin, Ma

2007-01-01T23:59:59.000Z

52

Hydrogen Refueling Station Costs in Shanghai  

E-Print Network [OSTI]

High-pressure hydrogen compressor Compressed hydrogento hydrogen storage vessels and compressors. Feedstock Costvehicles 3. Compressor: compresses hydrogen gas to achieve

Weinert, Jonathan X.; Shaojun, Liu; Ogden, J; Jianxin, Ma

2006-01-01T23:59:59.000Z

53

Holographic SIS Josephson Junction  

E-Print Network [OSTI]

We construct a holographic model for the superconductor-insulator-superconductor (SIS) Josephson junction at zero temperature by considering a complex scalar field coupled with a U(1) gauge field in the four dimensional Anti de Sitter soliton background. As a result, we successfully reproduce many characteristic features of the Josephson junction in condensed matter physics, such as the sine relation between the DC current and the phase difference across the junction.

Wang, Yong-Qiang; Cai, Rong-Gen; Takeuchi, Shingo; Zhang, Hai-Qing

2012-01-01T23:59:59.000Z

54

Aerodynamic performance measurements in a counter-rotating aspirated compressor  

E-Print Network [OSTI]

This thesis is an experimental investigation of the aerodynamic performances of a counter-rotating aspirated compressor. This compressor is implemented in a blow-down facility, which gives rigorous simulation of the ...

Onnée, Jean-François

2005-01-01T23:59:59.000Z

55

Development of a body force description for compressor stability assessment  

E-Print Network [OSTI]

This thesis presents a methodology for a body force description of a compressor with particular application to compressor stability calculations. The methodology is based on extracting blade forces from an axisymmetric ...

Kiwada, George (George Ford)

2008-01-01T23:59:59.000Z

56

Considerations in Dealing with the Risk of a Compressor Failure  

E-Print Network [OSTI]

Many plants do not have sufficient backup compressor capacity and risk having production outages due to compressor failures. Today, system designs are available that can eliminate this risk; however, there is a cost associated with doing so...

Beals, C. E.

2007-01-01T23:59:59.000Z

57

Development of a body force model for centrifugal compressors  

E-Print Network [OSTI]

This project is focused on modeling the internal ow in centrifugal compressors for the purpose of assessing the onset of rotating stall and surge. The current methods to determine centrifugal compressor stability limits ...

Kottapalli, Anjaney Pramod

2013-01-01T23:59:59.000Z

58

Impact of geometric variability on compressor repeating-stage performance  

E-Print Network [OSTI]

The impact of geometric variability on compressor performance is investigated using a compressor repeating-stage model based on well-known correlations for profile losses, endwall blockage, deviation, and the onset of ...

Vincent, Antoine, 1979-

2003-01-01T23:59:59.000Z

59

Method and apparatus for starting supersonic compressors  

DOE Patents [OSTI]

A supersonic gas compressor. The compressor includes aerodynamic duct(s) situated on a rotor journaled in a casing. The aerodynamic duct(s) generate a plurality of oblique shock waves for efficiently compressing a gas at supersonic conditions. The convergent inlet is adjacent to a bleed air collector, and during acceleration of the rotor, bypass gas is removed from the convergent inlet via a collector to enable supersonic shock stabilization. Once the oblique shocks are stabilized at a selected inlet relative Mach number and pressure ratio, the bleed of bypass gas from the convergent inlet via the bypass gas collectors is eliminated.

Lawlor, Shawn P. (Bellevue, WA)

2012-04-10T23:59:59.000Z

60

Introducing Back-up to Active Compressor Surge Control System  

E-Print Network [OSTI]

in a system with increased performance by taking advantage of both systems. Keywords: centrifugal compressorIntroducing Back-up to Active Compressor Surge Control System Nur Uddin Jan Tommy Gravdahl for introducing a back-up system to an active compressor surge control system is presented in this paper. Active

Gravdahl, Jan Tommy

Note: This page contains sample records for the topic "junction compressor station" 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

Modeling and Control of Surge and Rotating Stall in Compressors  

E-Print Network [OSTI]

in connection with acceleration of the compressor. Finally, a model for a centrifugal compression systemModeling and Control of Surge and Rotating Stall in Compressors Dr.ing. thesis Jan Tommy Gravdahl of rotating stall and surge in compressors. A close coupled valve is included in the Moore

Gravdahl, Jan Tommy

62

Most BurrowsWheeler Based Compressors are Not Optimal  

E-Print Network [OSTI]

Most Burrows­Wheeler Based Compressors are Not Optimal Haim Kaplan and Elad Verbin School.26, and 1.29, for each of the three compressors respectively. Our technique is robust, and can be used to prove similar claims for most BWT­based compressors (with a few notable exceptions). This stands

Kaplan, Haim

63

Active surge control of centrifugal compressors using drive torque  

E-Print Network [OSTI]

the operating range of the machine, and ef- ficiency is limited. Usually a recycle line around the compressor recycling, and there is a potential for reduced energy consumption of the compressor. Electric driveActive surge control of centrifugal compressors using drive torque Jan Tommy Gravdahl , Olav

Gravdahl, Jan Tommy

64

Josephson junction element  

SciTech Connect (OSTI)

A sandwich-type josephson junction element wherein a counter electrode is made of a mo-re alloy which contains 10-90 atomic-% of re. The josephson junction element has a high operating temperature, and any deterioration thereof attributed to a thermal cycle is not noted.

Kawabe, U.; Tarutani, Y.; Yamada, H.

1982-03-09T23:59:59.000Z

65

Three-junction solar cell  

DOE Patents [OSTI]

A photovoltaic solar cell is formed in a monolithic semiconductor. The cell contains three junctions. In sequence from the light-entering face, the junctions have a high, a medium, and a low energy gap. The lower junctions are connected in series by one or more metallic members connecting the top of the lower junction through apertures to the bottom of the middle junction. The upper junction is connected in voltage opposition to the lower and middle junctions by second metallic electrodes deposited in holes 60 through the upper junction. The second electrodes are connected to an external terminal.

Ludowise, Michael J. (Cupertino, CA)

1986-01-01T23:59:59.000Z

66

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

of Reciprocating Hydrogen Compressor Costs: (Industry)Summary of Diaphragm Hydrogen Compressor Costs (Industry)vs. delivered hydrogen, compressor type, storage pressure).

Lipman, T E; Weinert, Jonathan X.

2006-01-01T23:59:59.000Z

67

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

of Reciprocating Hydrogen Compressor Costs: (Industry)of Diaphragm Hydrogen Compressor Costs (Industry) Capacity (kWh/kg includes compressor) Capital Costs Hydrogen Equipment

Lipman, T E; Weinert, Jonathan X.

2006-01-01T23:59:59.000Z

68

Power Characteristics of Industrial Air Compressors  

E-Print Network [OSTI]

and with different loads are discussed as case studies. The case studies illustrate how to identify the type of control, and potential problems such as inadequate compressed air storage, over-sized compressors, and compressed air leaks from the power signatures...

Schmidt, C.; Kissock, K.

69

Resilient design of recharging station networks for electric transportation vehicles  

SciTech Connect (OSTI)

As societies shift to 'greener' means of transportation using electricity-driven vehicles one critical challenge we face is the creation of a robust and resilient infrastructure of recharging stations. A particular issue here is the optimal location of service stations. In this work, we consider the placement of battery replacing service station in a city network for which the normal traffic flow is known. For such known traffic flow, the service stations are placed such that the expected performance is maximized without changing the traffic flow. This is done for different scenarios in which roads, road junctions and service stations can fail with a given probability. To account for such failure probabilities, the previously developed facility interception model is extended. Results show that service station failures have a minimal impact on the performance following robust placement while road and road junction failures have larger impacts which are not mitigated easily by robust placement.

Kris Villez; Akshya Gupta; Venkat Venkatasubramanian

2011-08-01T23:59:59.000Z

70

Holographic SIS Josephson Junction  

E-Print Network [OSTI]

We construct a holographic model for the superconductor-insulator-superconductor (SIS) Josephson junction at zero temperature by considering a complex scalar field coupled with a Maxwell field in the four-dimensional anti-de Sitter soliton background. From the gravity side we reproduce the sine relation between the Josephson current and the phase difference across the junction. We also study the dependence of the maximal current on the dimension of the condensate operator and on the width of the junction, and obtain expected results.

Yong-Qiang Wang; Yu-Xiao Liu; Rong-Gen Cai; Shingo Takeuchi; Hai-Qing Zhang

2012-09-23T23:59:59.000Z

71

Refrigerator with a clearance seal compressor  

SciTech Connect (OSTI)

In a Stirling refrigeration system in which a displacer is driven in a reciprocating motion within a cold finger by a pressure differential between helium gas in the cold finger and helium gas in a gas spring volume, the reciprocating piston compressor for the working volume has a clearance seal between the working volume and a control volume. The only lubricant in that seal is the helium gas. The mean pressure of the working volume relative to the control volume can be controlled by varying the length of the clearance seal throughout the stroke of the piston. Preferably, the seal is between alumina ceramic sleeves. The clearance seal compressor may also be used in a Gifford-McMahon cycle.

Holland, N. J.

1985-09-10T23:59:59.000Z

72

Combined cold compressor/ejector helium refrigerator  

DOE Patents [OSTI]

A refrigeration apparatus having an ejector operatively connected with a cold compressor to form a two-stage pumping system. This pumping system is used to lower the pressure, and thereby the temperature of a bath of boiling refrigerant (helium). The apparatus as thus arranged and operated has substantially improved operating efficiency when compared to other processes or arrangements for achieving a similar low pressure.

Brown, D.P.

1984-06-05T23:59:59.000Z

73

Combined cold compressor/ejector helium refrigerator  

DOE Patents [OSTI]

A refrigeration apparatus having an ejector operatively connected with a cold compressor to form a two-stage pumping system. This pumping system is used to lower the pressure, and thereby the temperature of a bath of boiling refrigerant (helium). The apparatus as thus arranged and operated has substantially improved operating efficiency when compared to other processes or arrangements for achieving a similar low pressure.

Brown, Donald P. (Southold, NY)

1985-01-01T23:59:59.000Z

74

METAL HYDRIDE HYDROGEN COMPRESSORS: A REVIEW  

SciTech Connect (OSTI)

Metal hydride (MH) thermal sorption compression is an efficient and reliable method allowing a conversion of energy from heat into a compressed hydrogen gas. The most important component of such a thermal engine the metal hydride material itself should possess several material features in order to achieve an efficient performance in the hydrogen compression. Apart from the hydrogen storage characteristics important for every solid H storage material (e.g. gravimetric and volumetric efficiency of H storage, hydrogen sorption kinetics and effective thermal conductivity), the thermodynamics of the metal-hydrogen systems is of primary importance resulting in a temperature dependence of the absorption/desorption pressures). Several specific features should be optimized to govern the performance of the MH-compressors including synchronisation of the pressure plateaus for multi-stage compressors, reduction of slope of the isotherms and hysteresis, increase of cycling stability and life time, together with challenges in system design associated with volume expansion of the metal matrix during the hydrogenation. The present review summarises numerous papers and patent literature dealing with MH hydrogen compression technology. The review considers (a) fundamental aspects of materials development with a focus on structure and phase equilibria in the metal-hydrogen systems suitable for the hydrogen compression; and (b) applied aspects, including their consideration from the applied thermodynamic viewpoint, system design features and performances of the metal hydride compressors and major applications.

Bowman Jr, Robert C [ORNL] [ORNL; Yartys, Dr. Volodymyr A. [Institute for Energy Technology (IFE)] [Institute for Energy Technology (IFE); Lototskyy, Dr. Michael V [University of the Western Cape, South Africa] [University of the Western Cape, South Africa; Pollet, Dr. B.G. [University of the Western Cape, South Africa

2014-01-01T23:59:59.000Z

75

Analysis and developpment of a Turbivo compressor for MRV applications  

E-Print Network [OSTI]

The mechanical vapor recompression is an efficient process to decrease energy consumption of drying processes. In order to use the mechanical vapor recompression (MVR) in residential clothe dryers, the volumetric Turbivo technology is used to design a dry water vapor compressor. The Turbivo volumetric machine is composed mainly of a rotor with one blade, a stator, and a mobile oscillating thrust. The advantages of Turbivo(R) technology are the absence of contact between rotor and stator as well as the oil-free operation. A model of the Turbivo compressor, including kinematic, dynamic, and thermodynamic analysis is presented. The compressor internal tightness is ensured by a surface treatment of the compressor components. Using the model, a water vapor Turbivo compressor of 12m3/h and compression ratio of 5 has been sized and realized. The compressor prototype will be tested on a dedicated test bench to characterize its volumetric and isentropic efficiencies.

Ksayer, Elias Boulawz

2010-01-01T23:59:59.000Z

76

Analysis and developpment of a Turbivo compressor for MRV applications  

E-Print Network [OSTI]

The mechanical vapor recompression is an efficient process to decrease energy consumption of drying processes. In order to use the mechanical vapor recompression (MVR) in residential clothe dryers, the volumetric Turbivo technology is used to design a dry water vapor compressor. The Turbivo volumetric machine is composed mainly of a rotor with one blade, a stator, and a mobile oscillating thrust. The advantages of Turbivo(R) technology are the absence of contact between rotor and stator as well as the oil-free operation. A model of the Turbivo compressor, including kinematic, dynamic, and thermodynamic analysis is presented. The compressor internal tightness is ensured by a surface treatment of the compressor components. Using the model, a water vapor Turbivo compressor of 12m3/h and compression ratio of 5 has been sized and realized. The compressor prototype will be tested on a dedicated test bench to characterize its volumetric and isentropic efficiencies.

Elias Boulawz Ksayer; Denis Clodic

2010-08-12T23:59:59.000Z

77

Study of casing treatment effects in axial flow compressors  

E-Print Network [OSTI]

to in- creased tip leakage between shroud and blade tip. Figure (I) shows a typical performance curve for an axial flow compressor. Note that as pressure ratio increases, the operating 'range between surge and stall is decreased, there by reducing... the surge to stall margin of the axial flow compressor. REFERENCES I 1 ~ 4 Koch, C. C. , "Experimental Evaluation of Outer Case Blowing or Bleeding of Single Stage Axial Flow Compressor". , Part IV. Rep. R 69AEG256, General Electric Co. , (NASA CR...

Schiller, Robert Neil

1973-01-01T23:59:59.000Z

78

A method of predicting surge in centrifugal compressors  

E-Print Network [OSTI]

, x2, x3) coordinate system Re TPR Reynolds number clearance temperature compressor total pressure ratio blade speed absolute fluid velocity relative fluid velocity (x, y, z) inertial, Cartesian coordinate system (xl, x2, x3) non... two subdivisions. a. To determine the compressor efficiency as a depen- dent of speed and flow variables. b. To express the total pressure ratio across the compressor as a function of the flow, efficiency and the speed of impeller rotation...

Elchuri, Vijayvardhan

1975-01-01T23:59:59.000Z

79

Critical speed measurements in the Tevatron cold compressors  

SciTech Connect (OSTI)

The Fermilab Tevatron cryogenic system utilizes high-speed centrifugal cold compressors, manufactured by Ishikawajima-Harima Heavy Industries Co. Ltd. (IHI), for high energy operations. Nominal operating range for these compressors is 43,000 to 85,000 rpm. Past foil bearing failures prompted investigation to determine if critical speeds for operating compressors fall within operating range. Data acquisition hardware and software settings will be discussed for measuring liftoff, first critical and second critical speeds. Several tests provided comparisons between an optical displacement probe and accelerometer measurements. Vibration data and analysis of the 20 Tevatron ring cold compressors will be presented.

DeGraff, B.; Bossert, R.; Martinez, A.; Soyars, W.M.; /Fermilab

2006-01-01T23:59:59.000Z

80

Compression station key to Texas pipeline project  

SciTech Connect (OSTI)

This was probably the largest pipeline project in the US last year, and the largest in Texas in the last decade. The new compressor station is a key element in this project. TECO, its servicing dealer, and compression packager worked closely throughout the planning and installation stages of the project. To handle the amount of gas required, TECO selected the GEMINI F604-1 compressor, a four-throw, single-stage unit with a six-inch stroke manufactured by Weatherford Enterra Compression Co. (WECC) in Corpus Christi, TX. TECO also chose WECC to package the compressors. Responsibility for ongoing support of the units will be shared among TECO, the service dealer and the packager. TECO is sending people to be trained by WECC, and because the G3600 family of engines is still relatively new, both the Caterpillar dealer and WECC sent people for advanced training at Caterpillar facilities in Peoria, IL. As part of its service commitment to TECO, the servicing dealer drew up a detailed product support plan, encompassing these five concerns: Training, tooling; parts support; service support; and commissioning.

NONE

1996-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Numerical simulation of the impeller tip clearance effect on centrifugal compressor performance  

E-Print Network [OSTI]

This thesis presents the numerical simulation of flow in centrifugal compressors. A three-dimensional Navier-Stokes solver was employed to simulate flow through two centrifugal compressors. The first compressor simulated was the NASA low speed...

Hoenninger, Corbett Reed

2001-01-01T23:59:59.000Z

82

Modeling Schottky barrier SINIS junctions  

E-Print Network [OSTI]

: cond-mat/0001269 J. K. Freericks, Georgetown University, Josephson Junction talk, 2001 #12;Josephson). J. K. Freericks, Georgetown University, Josephson Junction talk, 2001 S I S I I V V Ic #12 University, Josephson Junction talk, 2001 S N S I I V V Ic #12;Digital Electronics and RSFQ logic · Rapid

Freericks, Jim

83

Hydrogen Refueling Station Costs in Shanghai  

E-Print Network [OSTI]

to hydrogen storage vessels and compressors. Feedstock CostHydrogen Production Equipment Purifier Storage System Compressor Dispenser Additional Equipment Installation Costshydrogen equipment costs. Meyers [2] provides an in depth analyses of reformer, compressor, and storage equipment costs.

Weinert, Jonathan X.; Shaojun, Liu; Ogden, Joan M; Jianxin, Ma

2006-01-01T23:59:59.000Z

84

Drive torque actuation in active surge control of centrifugal compressors  

E-Print Network [OSTI]

an approximation of a real compression system. 1 #12;CompressorShaft Electric drive Active surge control law Shaft (1999b) or Willems and de Jager (1999). In this study, which is on compressors with electrical drives, we propose to use the electrical drive as a means of active surge control, as depicted in Figure 1.

Gravdahl, Jan Tommy

85

Small core axial compressors for high efficiency jet aircraft  

E-Print Network [OSTI]

This thesis quantifies mechanisms that limit efficiency in small core axial compressors, defined here as compressor exit corrected flow between 1.5 and 3.0 lbm/s. The first part of the thesis describes why a small engine ...

DiOrio, Austin Graf

2012-01-01T23:59:59.000Z

86

Energy Efficient Implementation of Parallel CMOS Multipliers with Improved Compressors  

E-Print Network [OSTI]

Energy Efficient Implementation of Parallel CMOS Multipliers with Improved Compressors Dursun Baran constraints. It is shown that Non-Booth mul- tipliers start to become more energy efficient for strict delay targets. In addition, novel 3:2 and 4:2 compressors are pre- sented to save energy at the same target

California at Davis, University of

87

Coherence Progress: A Measure of Interestingness Based on Fixed Compressors  

E-Print Network [OSTI]

has been investigated in various ways in the literature, ranging from early work by Wundt [9] (seeCoherence Progress: A Measure of Interestingness Based on Fixed Compressors Tom Schaul, Leo Pape in observations to store them in a compact form, called a compressor. The search for interesting patterns can

Schmidhuber, Juergen

88

Superconductive tunnel junction integrated circuit  

SciTech Connect (OSTI)

Josephson Junction integrated circuits of the current injection type and magnetically controlled type utilize a superconductive layer that forms both Josephson Junction electrode for the Josephson Junction devices on the integrated circuit as well as a ground plane for the integrated circuit. Large area Josephson Junctions are utilized for effecting contact to lower superconductive layers and islands are formed in superconductive layers to provide isolation between the groundplane function and the Josephson Junction electrode function as well as to effect crossovers. A superconductor-barrier-superconductor trilayer patterned by local anodization is also utilized with additional layers formed thereover. Methods of manufacturing the embodiments of the invention are disclosed.

Jillie, D.W. Jr.; Smith, L.N.

1984-02-07T23:59:59.000Z

89

Spin Torques in Magnetic and Superconducting Tunnel Junctions  

E-Print Network [OSTI]

Josephson Junctions . . . . . . . . . . . . . . . . . . . . .Nonlinear Dynamics in a Magnetic Josephson Junction . . . .in a magnetic Josephson junction. ” Phys. Rev. B, 86:

Hoffman, Silas Eli

2012-01-01T23:59:59.000Z

90

New compressor systems seen paring refrigeration costs 15%  

SciTech Connect (OSTI)

Manufacturers claim that a parallel arrangement of three to five compressors of varying capacities can lower a store's refrigerating costs over 15%. The energy savings come from the more-precise matching of compressor capacity with refrigeration demand. The 500 stores that have installed uneven compressor systems are achieving a payback in under a year. Because it is important for controls to match a system for maximum efficiency, manufacturers are introducing tailor-made microprocessor controllers. A table summarizes three supermarket case histories. (DCK)

Barber, J.

1983-05-09T23:59:59.000Z

91

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

3-7: Booster Compressor Costs 3.5 Hydrogen PurificationkWh/kg includes compressor) Capital Costs Hydrogen EquipmentHydrogen Equipment Purifier Storage System Compressor Dispenser Additional Equipment Installation Costs

Weinert, Jonathan X.; Lipman, Timothy

2006-01-01T23:59:59.000Z

92

Compensating effect of the coherent synchrotron radiation in bunch compressors  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

Typical bunch compression for a high-gain free-electron laser (FEL) requires a large compression ratio. Frequently, this compression is distributed in multiple stages along the beam transport line. However, for a high-gain FEL driven by an energy recovery linac (ERL), compression must be accomplished in a single strong compressor located at the beam line’s end; otherwise the electron beam would be affected severely by coherent synchrotron radiation (CSR) in the ERL’s arcs. In such a scheme, the CSR originating from the strong compressors could greatly degrade the quality of the electron beam. In this paper, we present our design for a bunch compressor that will limit the effect of CSR on the e-beam’s quality. We discuss our findings from a study of such a compressor, and detail its potential for an FEL driven by a multipass ERL developed for the electron-Relativistic Heavy Ion Collider.

Jing, Yichao; Hao, Yue; Litvinenko, Vladimir N.

2013-06-01T23:59:59.000Z

93

An investigation of real gas effects in supercritical CO? compressors  

E-Print Network [OSTI]

This thesis presents a comprehensive assessment of real gas effects on the performance and matching of centrifugal compressors operating with CO2 at supercritical conditions. The analytical framework combines first principles ...

Baltadjiev, Nikola D. (Nikola Dimitrov)

2012-01-01T23:59:59.000Z

94

Multi-parameter control for centrifugal compressor performance optimization  

E-Print Network [OSTI]

The potential performance benefit of actuating inlet guide vane (IGV) angle, variable diffuser vane (VDV) angle and impeller speed to implement a multi-parameter control on a centrifugal compressor system is assessed. The ...

Mannai, Sébastien (Sébastien Karim)

2014-01-01T23:59:59.000Z

95

Non-intrusive fault detection in reciprocating compressors  

E-Print Network [OSTI]

This thesis presents a set of techniques for non-intrusive sensing and fault detection in reciprocating compressors driven by induction motors. The procedures developed here are "non-intrusive" because they rely only on ...

Schantz, Christopher James

2011-01-01T23:59:59.000Z

96

Forced response predictions in modern centrifugal compressor design  

E-Print Network [OSTI]

A computational interrogation of the time-averaged and time-unsteady flow fields of two centrifugal compressors of nearly identical design (the enhanced, which encountered aeromechanical difficulty, and production, which ...

Smythe, Caitlin J. (Caitlin Jeanne)

2005-01-01T23:59:59.000Z

97

Characterization of unsteady flow processes in a centrifugal compressor stage  

E-Print Network [OSTI]

Numerical experiments have been implemented to characterize the unsteady loading on the rotating impeller blades in a modem centrifugal compressor. These consist of unsteady Reynolds-averaged Navier Stokes simulations of ...

Gould, Kenneth A. (Kenneth Arthur)

2006-01-01T23:59:59.000Z

98

Centrifugal compressor return channel shape optimization using adjoint method  

E-Print Network [OSTI]

This thesis describes the construction of an automated gradient-based optimization process using the adjoint method and its application to centrifugal compressor return channel loss reduction. A proper objective function ...

Guo, Wei, S.M. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

99

Return channel loss reduction in multi-stage centrifugal compressors  

E-Print Network [OSTI]

This thesis presents concepts for improving the performance of return channels in multi-stage centrifugal compressors. Geometries have been developed to reduce both separation and viscous losses. A number of different ...

Aubry, Anne-Raphaëlle

2012-01-01T23:59:59.000Z

100

Energy conversion using thermal transpiration : optimization of a Knudsen compressor  

E-Print Network [OSTI]

Knudsen compressors are devices without any moving parts that use the nanoscale phenomenon of thermal transpiration to pump or compress a gas. Thermal transpiration takes place when a gas is in contact with a solid boundary ...

Klein, Toby A. (Toby Anna)

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Development of Inexpensive Turbo Compressor/Expanders for Industrial Use  

E-Print Network [OSTI]

within the bearing housing/. It contains the lube oil inlet port, the supply passages to the bearings and oil dra1 port. The bearing housing connects both thel turbine and compressor throughinteg~lal support flanges which are arranged 0 each end... was introduced. Drawings were made in sufficient detail and clarity to effect a smooth procurement and manufacturing program. The turbine and compressor wheels were dynamically balanced individually before plating and as an assembly after plating. To avoid...

Jacox, J. W.

102

Hyper dispersion pulse compressor for chirped pulse amplification systems  

DOE Patents [OSTI]

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

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

2011-11-29T23:59:59.000Z

103

Unwinding the Spin on Variable Speed Drive Air Compressors  

E-Print Network [OSTI]

, the spinners lead us to believe that every VSD compressor has a turndown of 80 percent or better. • Nameplate Horsepower – The spinners stated horsepower is often not the required horsepower. • Constant Pressure – A manufacturer states, “Line pressures... held within one psi”, while another states, “Line pressures held within ± 1.5 psi”. Still another manufacturer states, “High process stability”. Due to these statements, compressor sales personnel often make the statement, “If you install a VSD...

Beals, C. E.

2006-01-01T23:59:59.000Z

104

Screw Type Steam Compressors for Mechanical Vapor Recompression (MVR) Systems  

E-Print Network [OSTI]

to a usable pressure for reinjection into the process stream. Mycom has developed, designed and installed two large MVR systems using screw compressors: one for a brewery and the other for a whiskey plant. This paper discusses the system aspects... have been slowly adopted and restricted by the mechanical limitations of these compressors. Some of these limitations include: - Low Compression Ratio Poor Durability With Mist - Erosion - Corrosion, etc. The screw steam compression heat pump...

Kawamura, K.; Apaloo, Thomas-L.

105

ADVANCED COMPRESSOR ENGINE CONTROLS TO ENHANCE OPERATION, RELIABILITY AND INTEGRITY  

SciTech Connect (OSTI)

This document is the final report for the ''Advanced Compressor Engine Controls to Enhance Operation, Reliability, and Integrity'' project. SwRI conducted this project for DOE in conjunction with Cooper Compression, under DOE contract number DE-FC26-03NT41859. This report addresses an investigation of engine controls for integral compressor engines and the development of control strategies that implement closed-loop NOX emissions feedback.

Gary D. Bourn; Jess W. Gingrich; Jack A. Smith

2004-03-01T23:59:59.000Z

106

A Microscopic Examination of the Josephson Junction  

E-Print Network [OSTI]

A Microscopic Examination of the Josephson Junction J. K. Freericks, P. Miller, and M. Jarrell Review, 1999 #12;Introduction · The Josephson-Junction Computer · Maximize · Resistively Shunted Junction

Freericks, Jim

107

Macroscopic quantum tunneling in Josephson junctions -  

E-Print Network [OSTI]

Macroscopic quantum tunneling in Josephson junctions - a method to characterise a well-shielded low Theory 5 1. The classical theory of Josephson junctions . . . . . . . . . . . . . . . . . 9 1-Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2. Josephson junction dynamics . . . . . . . . . . . . . . . . . . . . . . . . 15 2.1 The basics

Gross, Rudolf

108

Development and Testing of a Screw Compressor Supermarket Refrigeration System: Phase II, Final Report.  

SciTech Connect (OSTI)

A laboratory prototype screw compressor refrigeration system was designed, fabricated and tested under various evaporator and ambient conditions. The design is based on a Dunham-Bush vertical hermetic screw compressor and other standard refrigeration components. Results indicate that a screw compressor rack with vapor injection can increase the thermodynamic efficiency of low temperature refrigeration in supermarkets by 20 to 28% compared to multiple reciprocating compressor racks. The payback period of the screw compressor refrigeration system relative to multiple reciprocating compressor systems is 1.1 to 1.5 years and the net present value savings range from 15 to 22 thousand dollars.

Borhanian, H. Hamed; Toscano, William M.; Lee, Kang P.

1987-02-01T23:59:59.000Z

109

Downhole steam generator having a downhole oxidant compressor  

DOE Patents [OSTI]

Apparatus and method for generation of steam in a borehole for penetration into an earth formation wherein a downhole oxidant compressor is used to compress relatively low pressure (atmospheric) oxidant, such as air, to a relatively high pressure prior to mixing with fuel for combustion. The multi-stage compressor receives motive power through a shaft driven by a gas turbine powered by the hot expanding combustion gases. The main flow of compressed oxidant passes through a velocity increasing nozzle formed by a reduced central section of the compressor housing. An oxidant bypass feedpipe leading to peripheral oxidant injection nozzles of the combustion chamber are also provided. The downhole compressor allows effective steam generation in deep wells without need for high pressure surface compressors. Feedback preheater means are provided for preheating fuel in a preheat chamber. Preheating of the water occurs in both a water feed line running from aboveground and in a countercurrent water flow channel surrounding the combustor assembly. The countercurrent water flow channels advantageously serve to cool the combustion chamber wall. The water is injected through slotted inlets along the combustion chamber wall to provide an unstable boundary layer and stripping of the water from the wall for efficient steam generation. Pressure responsive doors are provided at the steam outlet for closing and sealing the combustion chamber from entry of reservoir fluids in the event of a flameout.

Fox, Ronald L. (Albuquerque, NM)

1983-01-01T23:59:59.000Z

110

Development of an Electrochemical Separator and Compressor  

SciTech Connect (OSTI)

Global conversion to sustainable energy is likely to result in a hydrogen-based economy that supports U.S. energy security objectives while simultaneously avoiding harmful carbon emissions. A key hurdle to successful implementation of a hydrogen economy is the low-cost generation, storage, and distribution of hydrogen. One of the most difficult requirements of this transformation is achieving economical, high density hydrogen storage in passenger vehicles. Transportation applications may require compression and storage of high purity hydrogen up to 12,000 psi. Hydrogen production choices range from centralized low-pressure generation of relatively impure gas in large quantities from steam-methane reformer plants to distributed generation of hydrogen under moderate pressure using water electrolysis. The Electrochemical Hydrogen Separator + Compressor (EHS+C) technology separates hydrogen from impurities and then compresses it to high pressure without any moving parts. The Phase I effort resulted in the construction and demonstration of a laboratory-scale hardware that can separate and compress hydrogen from reformate streams. The completion of Phase I has demonstrated at the laboratory scale the efficient separation and compression of hydrogen in a cost effective manner. This was achieved by optimizing the design of the Electrochemical Hydrogen Compression (EHC) cell hardware and verified by parametric testing in single cell hardware. A broad range of commercial applications exist for reclamation of hydrogen. One use this technology would be in combination with commercial fuel cells resulting in a source of clean power, heat, and compressed hydrogen. Other applications include the reclamation of hydrogen from power plants and other industrial equipment where it is used for cooling, recovery of process hydrogen from heat treating processes, and semiconductor fabrication lines. Hydrogen can also be recovered from reformate streams and cryogenic boil-offs using this technology.

Trent Molter

2011-04-28T23:59:59.000Z

111

A simple criterion for three-dimensional flow separation in axial compressors  

E-Print Network [OSTI]

Most modem blade designs in axial-flow compressors diffuse the flow efficiently over 20% to 80% of blade span and it is the endwall regions that set the limits in compressor performance. This thesis addresses the estimation, ...

Lei, Vai-Man

2006-01-01T23:59:59.000Z

112

Application of a design optimization strategy to multi-stage compressor matching  

E-Print Network [OSTI]

A major challenge in the design of multi-stage compressors is the matching of stages to enable stable operation over a large range of mass flows and operating conditions. Particularly in turbofan low-pressure compressors, ...

Bert, Jérôme

2006-01-01T23:59:59.000Z

113

Noise Reduction of Centrifugal Compressors using Array of Quarter Wavelength Resonators  

E-Print Network [OSTI]

compressor is studied, which is aimed to reduce the tonal noise of the compressor. In order to optimally design the quarter-wavelength resonators, numerical simulations are performed by using a commercial software package, COMSOL Multiphysics – Acoustics...

Ye, Nan

2014-07-31T23:59:59.000Z

114

Turbo-alternator-compressor design for supercritical high density working fluids  

SciTech Connect (OSTI)

Techniques for generating power are provided. Such techniques involve a thermodynamic system including a housing, a turbine positioned in a turbine cavity of the housing, a compressor positioned in a compressor cavity of the housing, and an alternator positioned in a rotor cavity between the turbine and compressor cavities. The compressor has a high-pressure face facing an inlet of the compressor cavity and a low-pressure face on an opposite side thereof. The alternator has a rotor shaft operatively connected to the turbine and compressor, and is supported in the housing by bearings. Ridges extending from the low-pressure face of the compressor may be provided for balancing thrust across the compressor. Seals may be positioned about the alternator for selectively leaking fluid into the rotor cavity to reduce the temperature therein.

Wright, Steven A.; Fuller, Robert L.

2013-03-19T23:59:59.000Z

115

Design and operation of a counter-rotating aspirated compressor blowdown test facility  

E-Print Network [OSTI]

A unique counter-rotating aspirated compressor was tested in a blowdown facility at the Gas Turbine Laboratory at MIT. The facility expanded on experience from previous blowdown turbine and blowdown compressor experiments. ...

Parker, David V. (David Vickery)

2005-01-01T23:59:59.000Z

116

Commissioning of the LCLS Linac and Bunch Compressors  

SciTech Connect (OSTI)

The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) project under construction at SLAC [1]. The injector section, from drive-laser and RF photocathode gun through the first bunch compressor, was commissioned in the spring and summer of 2007. The second phase of commissioning, including the second bunch compressor and various main linac modifications, was completed in January through August of 2008. We report here on experience gained during this second phase of machine commissioning, including the injector, the first and second bunch compressor stages, the linac up to 14 GeV, and beam stability measurements. The final commissioning phase, including the undulator and the long transport line from the linac, is set to begin in December 2008, with first light expected in July 2009.

Akre, R.; Brachmann, A.; Decker, F.-J.; Ding, Y.; Dowell, D.; Emma#, P.; Frisch, J.; Gilevich, S.; Hays, G.; Hering, Ph.; Huang, Z.; Iverson, R.; Limborg-Deprey, C.; Loos, H.; Molloy, S.; Miahnahri, A.; Nuhn, H.-D.; Ratner, D.; Turner, J.; Welch, J.; White, W.; /SLAC

2008-08-20T23:59:59.000Z

117

A cryogenic axial-centrifugal compressor for superfluid helium refrigeration  

E-Print Network [OSTI]

CERN's new project, the Large Hadron Collider (LHC), will use superfluid helium as coolant for its high-field superconducting magnets and therefore require large capacity refrigeration at 1.8 K. This may only be achieved by subatmospheric compression of gaseous helium at cryogenic temperature. To stimulate development of this technology, CERN has procured from industry prototype Cold Compressor Units (CCU). This unit is based on a cryogenic axial-centrifugal compressor, running on ceramic ball bearings and driven by a variable-frequency electrical motor operating under low-pressure helium at ambient temperature. The machine has been commissioned and is now in operation. After describing basic constructional features of the compressor, we report on measured performance.

Decker, L; Schustr, P; Vins, M; Brunovsky, I; Lebrun, P; Tavian, L

1997-01-01T23:59:59.000Z

118

Josephson junction Q-spoiler  

DOE Patents [OSTI]

An automatic Q-spoiler comprising at least one Josephson tunnel junction connected in an LC circuit for flow of resonant current therethrough. When in use in a system for detecting the magnetic resonance of a gyromagnetic particle system, a high energy pulse of high frequency energy irradiating the particle system will cause the critical current through the Josephson tunnel junctions to be exceeded, causing the tunnel junctions to act as resistors and thereby damp the ringing of the high-Q detection circuit after the pulse. When the current has damped to below the critical current, the Josephson tunnel junctions revert to their zero-resistance state, restoring the Q of the detection circuit and enabling the low energy magnetic resonance signals to be detected.

Clarke, John (Berkeley, CA); Hilbert, Claude (Austin, TX); Hahn, Erwin L. (Berkeley, CA); Sleator, Tycho (Berkeley, CA)

1988-01-01T23:59:59.000Z

119

Josephson junction Q-spoiler  

DOE Patents [OSTI]

An automatic Q-spoiler comprising at least one Josephson tunnel junction connected in an LC circuit for flow of resonant current therethrough. When in use in a system for detecting the magnetic resonance of a gyromagnetic particle system, a high energy pulse of high frequency energy irradiating the particle system will cause the critical current through the Josephson tunnel junctions to be exceeded, causing the tunnel junctions to act as resistors and thereby damp the ringing of the high-Q detection circuit after the pulse. When the current has damped to below the critical current, the Josephson tunnel junctions revert to their zero-resistance state, restoring the Q of the detection circuit and enabling the low energy magnetic resonance signals to be detected.

Clarke, J.; Hilbert, C.; Hahn, E.L.; Sleator, T.

1986-03-25T23:59:59.000Z

120

Development and Testing of a Screw Compressor Supermarket Refrigeration System. Phase I Final Report.  

SciTech Connect (OSTI)

Aspen Systems, Inc. has completed the design and performance evaluation for a screw compressor refrigeration system for supermarket application. A major advantage of such a system is its ability to exactly match the compressor capacity to the refrigeration load. The capacity modulation of the compressor is performed by the repositioning of an infinitely adjustable slide valve. Another advantage of this system is its compatibility with vapor injection which is an inexpensive and reliable method of liquid subcooling and compressor intercooling.

Borhanian, H.H.; Toscano, W.M.

1985-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Duality in Josephson Junction Arrays  

E-Print Network [OSTI]

Various properties of mesoscopic two-dimensional Josephson junction arrays are reviewed. Particular attention is paid to structure of the topological excitations, charges and vortices, which are shown to be dual to each other. This duality persists in the presence of external magnetic fields and offset charges, which influence vortices and charges in an equivalent way. A double-layer junction array is also considered, where an even further reaching duality is discovered.

Ya. M. Blanter; Rosario Fazio; Gerd Schoen

1997-01-30T23:59:59.000Z

122

An investigation of axial-flow compressor blade treatments  

E-Print Network [OSTI]

of axial-flow compressor [5] . According to Schlicting [1], the basic methods of controlling the boundary layer on a body are (1) relative motion of the body surface w1th the flow, (2) acceleration of the boundary layer by blowing, (3) suction, (0) in...c methods. The literature survey revealed that three d1fferent techn1ques of boundary layer oontrol have been investigated for applicat1on to axial- flow compressor bladingi these are (1) the slotted blade, (2) the blade shape designed for a...

Sangerhausen, Charles Roger

1974-01-01T23:59:59.000Z

123

Polyol esters as HFC-134a compressor lubricants  

SciTech Connect (OSTI)

A polyol ester-based lubricant has been applied to HFC-134a household refrigerator compressors, because of its good miscibility with HFC-134a refrigerant, and there is a possibility that it will be applied to automobile air conditions. For better performance, further improvements are needed regarding miscibility, lubricity and chemical stability of the lubricant, because such systems are often used under extreme conditions. This report discusses the required properties and ways to improve performance of polyol esters as HFC-134a compressor lubricants. 7 refs., 14 figs., 4 tabs.

Komatsuzaki, S.; Homma, Y.; Itoh, Y. [Hitachi Ltd. (Japan)] [and others

1994-10-01T23:59:59.000Z

124

2009-32-0176/20097176 Miniature HCCI Free-Piston Engine Compressor  

E-Print Network [OSTI]

SETC2009 2009-32-0176/20097176 Miniature HCCI Free-Piston Engine Compressor For Orthosis charge compression ignition (HCCI) free-piston engine compressor aimed at an ankle-foot orthosis that the HCCI free- piston engine compressor, designed in a prototype package scale of about 80x40x20 mm

Durfee, William K.

125

Drive actuation in active control of centrifugal compressors Jan Tommy Gravdahl and Olav Egeland  

E-Print Network [OSTI]

Drive actuation in active control of centrifugal compressors Jan Tommy Gravdahl and Olav Egeland-1375 Billingstad NORWAY CompressorShaft Electric drive Active surge control law Shaft speed Compressor performance control Figure 1: Active surge control using drive 1 Introduction Traditionally, centrifugal

Gravdahl, Jan Tommy

126

A Moore-Greitzer axial compressor model with spool Jan Tommy Gravdahl and Olav Egeland  

E-Print Network [OSTI]

/surge-model. A model for centrifugal compressors with nonconstant speed was presented in 2]. In 5] a similar model applies to centrifugal compressors. It seems that the modeling and control of an axial com- pression) Table 1: Development in compressor stall/surge- control. A=Axial, C=Centrifugal, M=Modeling, C

Gravdahl, Jan Tommy

127

A Scalable Multi-Engine Xpress9 Compressor with Asynchronous Data Transfer Joo-Young Kim  

E-Print Network [OSTI]

to the host, which makes the proposed compressor useful under multi-threaded server environment. II. XPRESS9A Scalable Multi-Engine Xpress9 Compressor with Asynchronous Data Transfer Joo-Young Kim Microsoft as a PCIe accelerator to achieve CPU resource saving and high power efficiency. The proposed compressor

Hauck, Scott

128

Department of Mechanical and Nuclear Engineering Fall 2010 Advanced Cooled Compressor Diaphragms  

E-Print Network [OSTI]

PENNSTATE Department of Mechanical and Nuclear Engineering Fall 2010 Advanced Cooled Compressor compressor that is cooled by circulating water through its diaphragm (isothermal compression instead in future efforts to make this advanced cooled compressor a reality in the CCS industry #12;

Demirel, Melik C.

129

Investigation of H2 Diaphragm Compressors to Enable Low-Cost Long-Life Operation  

SciTech Connect (OSTI)

This is a “short” annual report to DOE Fuel Cell Technology Office describing the research on modeling and materials analysis of diaphragms in a diaphragm-type hydrogen compressor. The compressor design details and diaphragm materials were provided by PDC Machines, Inc., a commercial manufacturer of diaphragm-type hydrogen compressors that PNNL is partnering with in this project

Rohatgi, Aashish; Johnson, Kenneth I.

2013-12-01T23:59:59.000Z

130

Electromagnetically Induced Transparency in a Double Well Atomic Josephson Junction  

E-Print Network [OSTI]

observation of these Josephson junction resonances. 2.dressed Bose condensed Josephson junction Let us consider ain a Double Well Atomic Josephson Junction J.O. Weatherall

Weatherall, J. O.; Search, C. P.

2009-01-01T23:59:59.000Z

131

SOUTH STATION TAmtrak, Commuter  

E-Print Network [OSTI]

SOUTH STATION TAmtrak, Commuter Rail, Bus Station, MBTA Red Line Knapp St. Kneeland St. Stuart St) T BOYLSTON (MBTA Green Line) T NEW ENGLAND MEDICAL CENTER (MBTA Orange Line) Boston Campus Accessibility Map

Dennett, Daniel

132

Towards development of an incipient surge detection device for centrifugal compressors  

E-Print Network [OSTI]

and the centrifugal or mixed-flow compressor. Of these two compressors, the centrifugal type has the higher pressure ratio per stage. A typical performance map for a centrifugal compressor is shown in Fig. 1. Curves of constant efficiency, known as efficiency... the centrifugal compressor does have a higher pressure ratio, the axial flow compressor has a The citations on the following pages follow the style of t. h ASME Jo 1 f E~ f po Surge Line / ( I I I I / / / / / / / ncreasin m 0 0 e '4 C4 8 0 D...

Hassinger, David Alan

1978-01-01T23:59:59.000Z

133

Compressor Selection and Equipment Sizing for Cold Climate Heat Pumps  

SciTech Connect (OSTI)

In order to limit heating capacity degradation at -25 C (-13 F) ambient to 25%, compared to the nominal rating point capacity at 8.3 C (47 F), an extensive array of design and sizing options were investigated, based on fundamental equipment system modeling and building energy simulation. Sixteen equipment design options were evaluated in one commercial building and one residential building, respectively in seven cities. The energy simulation results were compared to three baseline cases: 100% electric resistance heating, a 9.6 HSPF single-speed heat pump unit, and 90% AFUE gas heating system. The general recommendation is that variable-speed compressors and tandem compressors, sized such that their rated heating capacity at a low speed matching the building design cooling load, are able to achieve the capacity goal at low ambient temperatures by over-speeding, for example, a home with a 3.0 ton design cooling load, a tandem heat pump could meet this cooling load running a single compressor, while running both compressors to meet heating load at low ambient temperatures in a cold climate. Energy savings and electric resistance heat reductions vary with building types, energy codes and climate zones. Oversizing a heat pump can result in larger energy saving in a less energy efficient building and colder regions due to reducing electric resistance heating. However, in a more energy-efficient building or for buildings in warmer climates, one has to consider balance between reduction of resistance heat and addition of cyclic loss.

Shen, Bo [ORNL] [ORNL; Abdelaziz, Omar [ORNL] [ORNL; Rice, C Keith [ORNL] [ORNL

2014-01-01T23:59:59.000Z

134

Scroll compressor modelling for heat pumps using hydrocarbons as refrigerants  

E-Print Network [OSTI]

1 Scroll compressor modelling for heat pumps using hydrocarbons as refrigerants Paul BYRNE and to install heat pumps in unoccupied spaces. Nevertheless manufacturers keep working on components for hydrocarbons. In the frame of a research project on heat pumps for simultaneous heating and cooling, an R407C

Paris-Sud XI, Université de

135

Applications of a Turbomachinery Design Tool for Compressors and Turbines  

E-Print Network [OSTI]

Applications of a Turbomachinery Design Tool for Compressors and Turbines Mark G. Turner University, 02139, USA Dario Bruna University of Genoa, Genoa, 16145, Italy A turbomachinery design system, T dynamics tools for the design and the analysis of turbomachinery con- figurations is well documented

Cincinnati, University of

136

Gas compressor with side branch absorber for pulsation control  

DOE Patents [OSTI]

A method and system for reducing pulsation in lateral piping associated with a gas compressor system. A tunable side branch absorber (TSBA) is installed on the lateral piping. A pulsation sensor is placed in the lateral piping, to measure pulsation within the piping. The sensor output signals are delivered to a controller, which controls actuators that change the acoustic dimensions of the SBA.

Harris, Ralph E. (San Antonio, TX); Scrivner, Christine M. (San Antonio, TX); Broerman, III, Eugene L. (San Antonio, TX)

2011-05-24T23:59:59.000Z

137

Environmental wear testing of nonmetallic materials for compressor applications  

SciTech Connect (OSTI)

A full-size prototypical test facility was designed and built to test nonmetallic materials in support of reciprocating compressor applications. Conventional test rigs utilize a pin- or ring-on-disk configuration to produce wear data in rotary motion under relatively low applied loads. In contrast, the subject test facility is constructed around a 9-inch (23-cm) stroke compressor frame. The test specimen and counterface configurations are similar to compressor packing rings and piston rods, respectively, and specimens are spring-loaded to variable levels encompassing actual compressor conditions. Testing to date has been performed at 500 rpm, 200 F (93 C), and three different load levels [65, 130 and 195 psi (450, 900 and 1,350 kPa)]. Material wear rate in air versus specimen pressure reveals a linear relationship with a slope of approximately 0.12 mils/day/psi (0.44 {micro}m/day/kPa). The wear performance of six different materials has been ranked in air. Future testing will focus on creating a database for material wear rates in air and nitrogen.

Parrington, R.J.; Hinchliff, E.M.

1999-07-01T23:59:59.000Z

138

POWER CHARACTERISTICS OF INDUSTRIAL AIR COMPRESSORS Chris Schmidt  

E-Print Network [OSTI]

of control, and potential problems such as inadequate compressed air storage, over-sized compressors are compared to suggested guidelines for energy-efficient air compression. INTRODUCTION Compressed air's annual electric costs, and the unit energy cost of compressed air ranges from about $0.15 to $0.35 per

Kissock, Kelly

139

ELECTRICAL ANALOGY MODELLING OF PEFC SYSTEM FED BY A COMPRESSOR  

E-Print Network [OSTI]

1 PB13-078 ELECTRICAL ANALOGY MODELLING OF PEFC SYSTEM FED BY A COMPRESSOR Moussa Chnani1 , Hattab is expected to have a low cost, a low weight and a low size, to compete with more and more efficient is representative of an embedded generator, i.e. few sensors, few actuators. Gaseous hydrogen is stored in a tank

Paris-Sud XI, Université de

140

83-9E9-TOPIC-P3 Unrestricted DOMslon ManagerHIGH-EFFICIENCY DUAL-STROKE COMPRESSOR  

E-Print Network [OSTI]

, two-capacity,.three cylinder, reciprocating piston, hermetic compressor for the advanced electric heat-pump

Oak Ridge National Laboratory

Note: This page contains sample records for the topic "junction compressor station" 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

Speed and surge control for a low order centrifugal compressor model Jan Tommy Gravdahl and Olav Egeland  

E-Print Network [OSTI]

Speed and surge control for a low order centrifugal compressor model Jan Tommy Gravdahl and Olav Previous work on stabilization of compressor surge is extended to include control of the angular velocity of the compressor. First a low order centrifugal compressor model is presented where the states are mass ow

Gravdahl, Jan Tommy

142

Hydrogen refueling station costs in Shanghai  

E-Print Network [OSTI]

Hydrogen production equipment Puri?er Storage system Compressor Dispenser Additional equipment Installation costshydrogen storage vessels and compressors. 2.4.4. Feedstock costhydrogen equipment costs. Meyers [2] pro- vides an in depth analyses of reformer, compressor, and storage equipment costs.

Weinert, Jonathan X.; Shaojun, Liu; Ogden, Joan M; Jianxin, Ma

2007-01-01T23:59:59.000Z

143

Pilot study of commercial water-loop heat pump compressor life  

SciTech Connect (OSTI)

This study of the service life of water-loop heat pump compressors in commercial office buildings, using data gathered from the service records of one heat pump service contractor, focused on the replacement of compressors in small console ( perimeter'') water-loop heat pumps and in larger vertical and horizontal ( core'') units. A statistical methodology for dealing with censored data was developed for this study which is an extension of the methodologies used in other EPRI studies of heat pump and heat pump compressor life. By extrapolating a Weibull distribution curve fitted to the data, the median service life of the sample of perimeter unit compressors (the age at which 50% of the original population of compressors would be expected to have been replaced) was estimated to be 47 years. The median service life of a sample that excluded compressors with a known manufacturing defect was estimated to be 69 years. Core unit compressor replacements were analyzed in the same manner. Extrapolation of a Weibull distribution yielded an estimated median service life of core unit compressors of 12 years. As with the perimeter unit compressors, there was an identified manufacturing defect. When the compressors with the identified fault were excluded from the sample and the data reanalyzed, the median service life for the compressors in the remainder of the buildings was estimated to be 18 years.

Ross, D.P. (Policy Research Associates, Inc., Reston, VA (USA))

1990-03-01T23:59:59.000Z

144

A Near-term Economic Analysis of Hydrogen Fueling Stations  

E-Print Network [OSTI]

of Diaphragm Hydrogen Compressor Costs (Industry) Capacity (Hydrogen Fueling Systems A nalysis” The report examines reformer, storage and compressor costsHydrogen Equipment Storage System Compressor Dispenser Delivery and Installation Cost

Weinert, Jonathan X.

2005-01-01T23:59:59.000Z

145

A Near-Term Economic Analysis of Hydrogen Fueling Stations  

E-Print Network [OSTI]

of Diaphragm Hydrogen Compressor Costs (Industry) Capacity (Hydrogen Fueling Systems A nalysis” The report examines reformer, storage and compressor costsHydrogen Equipment Storage System Compressor Dispenser Delivery and Installation Cost

Weinert, Jonathan X.

2005-01-01T23:59:59.000Z

146

Hydrogen Energy Stations: Poly-Production of Electricity, Hydrogen, and Thermal Energy  

E-Print Network [OSTI]

psi) High-pressure hydrogen compressor Compressed hydrogen2005 High-pressure hydrogen compressor Compressed hydrogenthe hydrogen, a hydrogen compressor, high-pressure tank

Lipman, Timothy; Brooks, Cameron

2006-01-01T23:59:59.000Z

147

Alexey Ustinov Two-level fluctuators in Josephson junctions Josephson junction as a tool to  

E-Print Network [OSTI]

Alexey Ustinov Two-level fluctuators in Josephson junctions Josephson junction as a tool;Alexey Ustinov Two-level fluctuators in Josephson junctions Outline JJ phase qubit Microwave spectroscopy. Ustinov. ArXiv:0909.3425 #12;Alexey Ustinov Two-level fluctuators in Josephson junctions Josephson tunnel

Fominov, Yakov

148

Precision measurement with an optical Josephson junction  

E-Print Network [OSTI]

We study a new type of Josephson device, the so-called "optical Josephson junction" as proposed in Phys. Rev. Lett. {\\bf 95}, 170402 (2005). Two condensates are optically coupled through a waveguide by a pair of Bragg beams. This optical Josephson junction is analogous to the usual Josephson junction of two condensates weakly coupled via tunneling. We discuss the use of this optical Josephson junction, for making precision measurements.

H. T. Ng; K. Burnett; J. A. Dunningham

2006-11-18T23:59:59.000Z

149

Precision measurement with an optical Josephson junction  

SciTech Connect (OSTI)

We present a theoretical study of a type of Josephson device, the so-called 'optical Josephson junction' [Y. Shin et al. Phys. Rev. Lett. 95, 170402 (2005).]. In this device, two condensates are optically coupled through a waveguide by a pair of Bragg beams. This optical Josephson junction differs from the usual Josephson junction where condensates are weakly coupled by tunneling through a barrier. We discuss the use of this optical Josephson junction, for making precision measurements.

Ng, H. T.; Burnett, K. [Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Dunningham, J. A. [School of Physics and Astronomy, University of Leeds, LS2 9JT (United Kingdom)

2007-06-15T23:59:59.000Z

150

Dynamics of Josephson-junction ladders  

SciTech Connect (OSTI)

We have numerically studied dynamical behaviors of Josephson-junction ladders consisting of [ital N][sub [ital p

Kim, J. (Department of Physics, Basic Science Research Institute, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600 (Korea, Republic of) Division of Basic Science Research, Research Institute of Industrial Science and Technology, Pohang P.O. Box 135, Kyungbuk 790-600 (Korea, Republic of)); Choe, W.G.; Kim, S. (Department of Physics, Basic Science Research Institute, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600 (Korea, Republic of)); Lee, H.J. (Department of Physics, Basic Science Research Institute, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600 (Korea, Republic of) Division of Basic Science Research, Research Institute of Industrial Science and Technology, Pohang P.O. Box 135, Kyungbuk 790-600 (Korea, Republic of))

1994-01-01T23:59:59.000Z

151

High Technology Centrifugal Compressor for Commercial Air Conditioning Systems  

SciTech Connect (OSTI)

R&D Dynamics, Bloomfield, CT in partnership with the State of Connecticut has been developing a high technology, oil-free, energy-efficient centrifugal compressor called CENVA for commercial air conditioning systems under a program funded by the US Department of Energy. The CENVA compressor applies the foil bearing technology used in all modern aircraft, civil and military, air conditioning systems. The CENVA compressor will enhance the efficiency of water and air cooled chillers, packaged roof top units, and other air conditioning systems by providing an 18% reduction in energy consumption in the unit capacity range of 25 to 350 tons of refrigeration The technical approach for CENVA involved the design and development of a high-speed, oil-free foil gas bearing-supported two-stage centrifugal compressor, CENVA encompassed the following high technologies, which are not currently utilized in commercial air conditioning systems: Foil gas bearings operating in HFC-134a; Efficient centrifugal impellers and diffusers; High speed motors and drives; and System integration of above technologies. Extensive design, development and testing efforts were carried out. Significant accomplishments achieved under this program are: (1) A total of 26 builds and over 200 tests were successfully completed with successively improved designs; (2) Use of foil gas bearings in refrigerant R134a was successfully proven; (3) A high speed, high power permanent magnet motor was developed; (4) An encoder was used for signal feedback between motor and controller. Due to temperature limitations of the encoder, the compressor could not operate at higher speed and in turn at higher pressure. In order to alleviate this problem a unique sensorless controller was developed; (5) This controller has successfully been tested as stand alone; however, it has not yet been integrated and tested as a system; (6) The compressor successfully operated at water cooled condensing temperatures Due to temperature limitations of the encoder, it could not be operated at air cooled condensing temperatures. (7) The two-stage impellers/diffusers worked well separately but combined did not match well.

Ruckes, John

2006-04-15T23:59:59.000Z

152

IEMDC IN-LINE ELECTRIC MOTOR DRIVEN COMPRESSOR  

SciTech Connect (OSTI)

This report contains the final project summary and deliverables required by the award for the development of an In-line Electric Motor Driven Compressor (IEMDC). Extensive work was undertaken during the course of the project to develop the motor and the compressor section of the IEMDC unit. Multiple design iterations were performed to design an electric motor for operation in a natural gas environment and to successfully integrate the motor with a compressor. During the project execution, many challenges were successfully overcome in order to achieve the project goals and to maintain the system design integrity. Some of the challenges included limiting the magnitude of the compressor aerodynamic loading for appropriate sizing of the magnetic bearings, achieving a compact motor rotor size to meet the rotor dynamic requirements of API standards, devising a motor cooling scheme using high pressure natural gas, minimizing the impact of cooling on system efficiency, and balancing the system thrust loads for the magnetic thrust bearing. Design methods that were used on the project included validated state-of-the-art techniques such as finite element analysis and computational fluid dynamics along with the combined expertise of both Curtiss-Wright Electro-Mechanical Corporation and Dresser-Rand Company. One of the most significant areas of work undertaken on the project was the development of the unit configuration for the system. Determining the configuration of the unit was a significant step in achieving integration of the electric motor into a totally enclosed compression system. Product review of the IEMDC unit configuration was performed during the course of the development process; this led to an alternate design configuration. The alternate configuration is a modular design with the electric motor and compressor section each being primarily contained in its own pressure containing case. This new concept resolved the previous conflict between the aerodynamic flow passage requirements and electric motor requirements for support and utilities by bounding the flowpath within the compressor section. However most importantly, the benefits delivered by the new design remained the same as those proposed by the goals of the project. In addition, this alternate configuration resulted in the achievement of a few additional advantages over the original concept such as easier maintenance, operation, and installation. Interaction and feedback solicited from target clients regarding the unit configuration supports the fact that the design addresses industry issues regarding accessibility, maintainability, preferred operating practice, and increased reliability.

Michael J. Crowley; Prem N. Bansal

2004-10-01T23:59:59.000Z

153

Quantum effects in nanoscale Josephson junction circuits  

E-Print Network [OSTI]

Quantum effects in nanoscale Josephson junction circuits SILVIA CORLEVI Doctoral Thesis Stockholm Josephson junction arrays with SQUID geometry. TRITA FYS 2006:31 ISSN 0280-316X ISRN KTH/FYS/­06:31­SE ISBN study on single-charge effects in nanoscale Josephson junctions and Cooper pair transistors (CPTs

Haviland, David

154

Josephson-junction logic device  

SciTech Connect (OSTI)

A Josephson-junction logic device having inductances and forming and AND circuit is described comprising: at least two superconductive loops, each having at least two Josephson-junction elements and a loop inductance connected between each of at least two Josephson-junction elements; at least two logic input signal lines, operatively connected to receive input currents, for supplying logic input signals; a bias line, operatively connected to at least two super conductive loops, for supplying a bias current to at least two superconductive loops, the bias current satisfying the condition vertical bar I/sub ml/ vertical bar > vertical bar I/sub mo/ vertical bar, where I/sub ml/ is a first threshold current, for switching the AND circuit, determined when at least two logic input signal lines receive different magnitude input currents and where I/sub mo/ is a second threshold current for switching the AND circuit, determined when at least two logic input signal lines receive the same magnitude input currents; and output terminals, operatively connected to one of at least two Josephson-junction elements, for outputting a logic output signal as a result of a logic operation performed on the logic input signals, whereby an operating margin of the AND circuit is expanded.

Suzuki, H.

1987-12-01T23:59:59.000Z

155

Heat powered refrigeration compressor. Semi-annual technical report  

SciTech Connect (OSTI)

The objective of this program is to develop and improve the design of previously started prototypes of the Heat Powered Refrigeration Compressor. To build this prototype and ready it for testing by the University of Evansville is another goal. This prototype will be of similar capacity as the compressor that will eventually be commercially produced. This unit can operate on almost any moderate temperature water heat source. This heat source could include such applications as industrial waste heat, solar, wood burning stove, resistance electrical heat produced by a windmill, or even perhaps heat put out by the condenser of another refrigeration system. Work performed in the past four months has consisted of: engineering of HX-1; comparisons of specifications from different companies to ensure state of the art applications of parts for project; coordinating project requirements with machine shop; designing condenser; and partial assembly of HX-1.

Goad, R.R.

1981-01-01T23:59:59.000Z

156

Turbine inter-disk cavity cooling air compressor  

DOE Patents [OSTI]

A combustion turbine may have a cooling circuit for directing a cooling medium through the combustion turbine to cool various components of the combustion turbine. This cooling circuit may include a compressor, a combustor shell and a component of the combustion turbine to be cooled. This component may be a rotating blade of the combustion turbine. A pressure changing mechanism is disposed in the combustion turbine between the component to be cooled and the combustor shell. The cooling medium preferably flows from the compressor to the combustor shell, through a cooler, the component to the cooled and the pressure changing mechanism. After flowing through the pressure changing mechanism, the cooling medium is returned to the combustor shell. The pressure changing mechanism preferably changes the pressure of the cooling medium from a pressure at which it is exhausted from the component to be cooled to approximately that of the combustor shell.

Little, David Allen (Oviedo, FL)

2001-01-01T23:59:59.000Z

157

A High Reliability Gas-driven Helium Cryogenic Centrifugal Compressor  

E-Print Network [OSTI]

A helium cryogenic compressor was developed and tested in real conditions in 1996. The achieved objective was to compress 0.018 kg/s Helium at 4 K @ 1000 Pa (10 mbar) up to 3000 Pa (30 mbar). This project was an opportunity to develop and test an interesting new concept in view of future needs. The main features of this new specific technology are described. Particular attention is paid to the gas bearing supported rotor and to the pneumatic driver. Trade off between existing technologies and the present work are presented with special stress on the bearing system and the driver. The advantages are discussed, essentially focused on life time and high reliability without maintenance as well as non pollution characteristic. Practical operational modes are also described together with the experimental performances of the compressor. The article concludes with a brief outlook of future work.

Bonneton, M; Gistau-Baguer, Guy M; Turcat, F; Viennot, P

1998-01-01T23:59:59.000Z

158

Plasma Switch for High-Power Active Pulse Compressor  

SciTech Connect (OSTI)

Results are presented from experiments carried out at the Naval Research Laboratory X-band magnicon facility on a two-channel X-band active RF pulse compressor that employed plasma switches. Experimental evidence is shown to validate the basic goals of the project, which include: simultaneous firing of plasma switches in both channels of the RF circuit, operation of quasi-optical 3-dB hybrid directional coupler coherent superposition of RF compressed pulses from both channels, and operation of the X-band magnicon directly in the RF pulse compressor. For incident 1.2 ?s pulses in the range 0.63 ? 1.35 MW, compressed pulses of peak powers 5.7 ? 11.3 MW were obtained, corresponding to peak power gain ratios of 8.3 ? 9.3. Insufficient bakeout and conditioning of the high-power RF circuit prevented experiments from being conducted at higher RF input power levels.

Hirshfield, Jay L. [Omega-P, Inc.] [Omega-P, Inc.

2013-11-04T23:59:59.000Z

159

Method of manufacturing Josephson junction integrated circuits  

SciTech Connect (OSTI)

Josephson junction integrated circuits of the current injection type and magnetically controlled type utilize a superconductive layer that forms both Josephson junction electrode for the Josephson junction devices on the integrated circuit as well as a ground plane for the integrated circuit. Large area Josephson junctions are utilized for effecting contact to lower superconductive layers and islands are formed in superconductive layers to provide isolation between the groudplane function and the Josephson junction electrode function as well as to effect crossovers. A superconductor-barrier-superconductor trilayer patterned by local anodization is also utilized with additional layers formed thereover. Methods of manufacturing the embodiments of the invention are disclosed.

Jillie Jr., D. W.; Smith, L. N.

1985-02-12T23:59:59.000Z

160

Turbine inter-disk cavity cooling air compressor  

DOE Patents [OSTI]

The inter-disk cavity between turbine rotor disks is used to pressurize cooling air. A plurality of ridges extend radially outwardly over the face of the rotor disks. When the rotor disks are rotated, the ridges cause the inter-disk cavity to compress air coolant flowing through the inter-disk cavity en route to the rotor blades. The ridges eliminate the need for an external compressor to pressurize the air coolant.

Chupp, Raymond E. (Oviedo, FL); Little, David A. (Oviedo, FL)

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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
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161

Turbine inter-disk cavity cooling air compressor  

DOE Patents [OSTI]

The inter-disk cavity between turbine rotor disks is used to pressurize cooling air. A plurality of ridges extend radially outwardly over the face of the rotor disks. When the rotor disks are rotated, the ridges cause the inter-disk cavity to compress air coolant flowing through the inter-disk cavity en route to the rotor blades. The ridges eliminate the need for an external compressor to pressurize the air coolant. 5 figs.

Chupp, R.E.; Little, D.A.

1998-01-06T23:59:59.000Z

162

Linear Complexity Lossy Compressor for Binary Redundant Memoryless Sources  

E-Print Network [OSTI]

A lossy compression algorithm for binary redundant i.i.d. sources is presented. The proposed scheme is based on sparse graph codes. By introducing a nonlinear function, redundant memoryless sequences can be compressed. We propose a linear complexity compressor based on the extended belief propagation, into which an inertia term is heuristically introduced, and show that it has near optimal performance for moderate blocklengths.

Mimura, Kazushi

2011-01-01T23:59:59.000Z

163

Downhole steam generator having a downhole oxidant compressor  

DOE Patents [OSTI]

Am improved apparatus is described for the downhole injection of steam into boreholes, for tertiary oil recovery. It includes an oxidant supply, a fuel supply, an igniter, a water supply, an oxidant compressor, and a combustor assembly. The apparatus is designed for efficiency, preheating of the water, and cooling of the combustion chamber walls. The steam outlet to the borehole is provided with pressure-responsive doors for closing the outlet in response to flameout. (DLC)

Fox, R.L.

1981-01-07T23:59:59.000Z

164

Simulating effects of multispeed compressors on refrigerator/freezer performance  

SciTech Connect (OSTI)

Simulation analyses suggest that a multispeed compressor could increase steady-state operating efficiency by 4% to 14%. An additional 0.5% to 4% energy savings might be obtained from the reduction in the cycling frequency of the refrigerator. Several aspects of the robustness of the capillary tube-suction line heat exchanger design for the two-speed compressor system were also examined with the simulation model. It was shown that a system optimized for low-speed operation, when operating at the high speed, could have as much capacity as the original base case high-speed system. A relatively simple control strategy was proposed, one that requires measurement of on-cycle time and one or two compartment air temperatures. The effects of varying the speed of the evaporator or condenser fans at both compressor speeds were examined over a range of ambient temperatures. One energy-saving scenario was identified: decreasing the condenser fan speed for refrigerators operating at low ambient temperatures. By affecting the distribution of refrigerant change throughout the system, the decrease in condenser fan speed reduces the superheat in the evaporator and increases the overall UA of the evaporator. The resulting increase in evaporator capacity more than offsets the decrease in condenser UA and the energy use of the refrigerator is decreased.

Woodall, R.J. [International Paper Technology, Mobile, AL (United States); Bullard, C.W. [Univ. of Illinois, Urbana, IL (United States). Air Conditioning and Refrigeration Center

1997-12-31T23:59:59.000Z

165

Avoiding compressor surge during emergency shutdown hybridturbine systems  

SciTech Connect (OSTI)

A new emergency shutdown procedure for a direct-fired fuel cell turbine hybrid power system was evaluated using a hardware-based simulation of an integrated gasifier/fuel cell/turbine hybrid cycle (IGFC), implemented through the Hybrid Performance (Hyper) project at the National Energy Technology Laboratory, U.S. Department of Energy (NETL). The Hyper facility is designed to explore dynamic operation of hybrid systems and quantitatively characterize such transient behavior. It is possible to model, test, and evaluate the effects of different parameters on the design and operation of a gasifier/fuel cell/gas turbine hybrid system and provide a means of quantifying risk mitigation strategies. An open-loop system analysis regarding the dynamic effect of bleed air, cold air bypass, and load bank is presented in order to evaluate the combination of these three main actuators during emergency shutdown. In the previous Hybrid control system architecture, catastrophic compressor failures were observed when the fuel and load bank were cut off during emergency shutdown strategy. Improvements were achieved using a nonlinear fuel valve ramp down when the load bank was not operating. Experiments in load bank operation show compressor surge and stall after emergency shutdown activation. The difficulties in finding an optimal compressor and cathode mass flow for mitigation of surge and stall using these actuators are illustrated.

Pezzini, Paolo [University of Genova, Italy; Tucker, David [U.S. DOE; Traverso, Alberto [University of Genova, Italy

2013-01-01T23:59:59.000Z

166

Investigation of flow in vane-island diffusers in centrifugal compressors  

E-Print Network [OSTI]

. Meherwan P. Boyce In this thesis, both theoretical and experimental investigations of flow in a high pressure ratio centrifugal compressor vane-island diffuser, have been carried out. The flow propagation through the island diffuser and the boundary... flow angles. The separation should be avoided or delayed to improve compressor performance. Johnson and Powers [7] have looked into the effect of inlet blockage on diffuser performance. The high-pressure-ratio centrifugal compressor has narrow...

Vandijk, Hanne Nicolaas

1976-01-01T23:59:59.000Z

167

Dual capacity compressor with reversible motor and controls arrangement therefor  

DOE Patents [OSTI]

A hermetic reciprocating compressor such as may be used in heat pump applications is provided for dual capacity operation by providing the crankpin of the crankshaft with an eccentric ring rotatably mounted thereon, and with the end of the connecting rod opposite the piston encompassing the outer circumference of the eccentric ring, with means limiting the rotation of the eccentric ring upon the crankpin between one end point and an opposite angularly displaced end point to provide different values of eccentricity depending upon which end point the eccentric ring is rotated to upon the crankpin, and a reversible motor in the hermetic shell of the compressor for rotating the crankshaft, the motor operating in one direction effecting the angular displacement of the eccentric ring relative to the crankpin to the one end point, and in the opposite direction effecting the angular displacement of the eccentric ring relative to the crankpin to the opposite end point, this arrangement automatically giving different stroke lengths depending upon the direction of motor rotation. The mechanical structure of the arrangement may take various forms including at least one in which any impact of reversal is reduced by utilizing lubricant passages and chambers at the interface area of the crankpin and eccentric ring to provide a dashpot effect. In the main intended application of the arrangement according to the invention, that is, in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction of compressor operation. A control arrangement is provided in which the control system controls the direction of motor operation in accordance with temperature conditions, the system including control means for effecting operation in a low capacity direction or alternatively in a high capacity direction in response to one set, and another set, respectively, of temperature conditions and with timer means delaying a restart of the compressor motor for at least a predetermined time in response to a condition of the control means operative to initiate a change in the operating direction of the compressor when it restarts.

Sisk, Francis J. (Washington Township, Fayette County, PA)

1980-12-02T23:59:59.000Z

168

OBSERVATION OF ZERO POINT FLUCTUATIONS IN A RESISTIVELY SHUNTED JOSEPHSON TUNNEL JUNCTION  

E-Print Network [OSTI]

resistively shunted Josephson junctions in which quantumresistively shunted Josephson junction. For measurementresistively shunted Josephson junction in the quantum limit.

Koch, Roger H.

2012-01-01T23:59:59.000Z

169

Josephson junctions and dark energy  

E-Print Network [OSTI]

In a recent paper Beck and Mackey [astro-ph/0603397] argue that the argument we gave in our paper [Phys. Lett. B 606, 77 (2005)] to disprove their claim that dark energy can be discovered in the Lab through noise measurements of Josephson junctions is incorrect. In particular, they emphasize that the measured noise spectrum in Josephson junctions is a consequence of the fluctuation dissipation theorem, while our argument was based on equilibrium statistical mechanics. In this note we show that the fluctuation dissipation relation does not depend upon any shift of vacuum (zero-point) energies, and therefore, as already concluded in our previous paper, dark energy has nothing to do with the proposed measurements.

Philippe Jetzer; Norbert Straumann

2006-04-25T23:59:59.000Z

170

Microwave photonics with Josephson junction arrays  

E-Print Network [OSTI]

We introduce an architecture for a photonic crystal in the microwave regime based on superconducting transmission lines interrupted by Josephson junctions. A study of the scattering properties of a single junction in the line shows that the junction behaves as a perfect mirror when the photon frequency matches the Josephson plasma frequency. We generalize our calculations to periodic arrangements of junctions, demonstrating that they can be used for tunable band engineering, forming what we call a quantum circuit crystal. As a relevant application, we discuss the creation of stationary entanglement between two superconducting qubits interacting through a disordered media.

Zueco, David; Solano, Enrique; García-Ripoll, Juan José

2011-01-01T23:59:59.000Z

171

Holographic p-wave Josephson junction  

E-Print Network [OSTI]

In this work we generalized holographic model for s-wave DC Josephson junction constructed in arXiv:1101.3326[hep-th] to a holographic description for p-wave Josephson junction. By solving numerically the coupled equations of motion of Yang-Mills theory for a non-Abelian SU(2) gauge fields in (3+1)-dimensional AdS spacetimes, we shown that DC current of the p-wave Josephson junction is proportional to the sine of the phase difference across the junction like the s-wave case.

Wang, Yong-Qiang; Zhao, Zhen-Hua

2011-01-01T23:59:59.000Z

172

Holographic p-wave Josephson junction  

E-Print Network [OSTI]

In this work we generalized holographic model for s-wave DC Josephson junction constructed in arXiv:1101.3326[hep-th] to a holographic description for p-wave Josephson junction. By solving numerically the coupled equations of motion of Yang-Mills theory for a non-Abelian SU(2) gauge fields in (3+1)-dimensional AdS spacetimes, we shown that DC current of the p-wave Josephson junction is proportional to the sine of the phase difference across the junction like the s-wave case.

Yong-Qiang Wang; Yu-Xiao Liu; Zhen-Hua Zhao

2011-09-20T23:59:59.000Z

173

Thrust Area 2 Free-Piston Compressor for Portable Fluid-Powered Systems  

E-Print Network [OSTI]

Thrust Area 2 Free-Piston Compressor for Portable Fluid-Powered Systems Dr. Eric J. Barth José AMH batteries). Utili hi h d it li ti Free Piston Compressor (FPC) vs. Electrical Batteries System Source Energy · Utilize a free piston engine configuration to compress air by extracting energy from combustion of propane

Barth, Eric J.

174

Design of a Free Piston Pneumatic Compressor as a Mobile Robot Power Supply  

E-Print Network [OSTI]

Design of a Free Piston Pneumatic Compressor as a Mobile Robot Power Supply Jose A. Riofrio.j.barth@vanderbilt.edu Abstract ­ The design of a free piston compressor (FPC) intended as a pneumatic power supply combustion to compress air into a high-pressure supply tank by using the kinetic energy of a free piston

Barth, Eric J.

175

TCgen 2.0: A Tool to Automatically Generate Lossless Trace Compressors Martin Burtscher  

E-Print Network [OSTI]

TCgen 2.0: A Tool to Automatically Generate Lossless Trace Compressors Martin Burtscher Computer of TCgen, a tool for generating portable lossless trace compressors based on user-provided trace format, making it ideal for trace-based research and teaching environments as well as for trace archives. Version

Burtscher, Martin

176

Testing and modeling of compressors for low-lift cooling applications  

E-Print Network [OSTI]

In this thesis, an inverter-driven variable speed scroll compressor is tested on a de-superheater test stand to determine its performance in areas of low-lift and low compressor speed. The goal is to adapt this test stand ...

Willingham, Ryan Alexander

2009-01-01T23:59:59.000Z

177

NOISE CONTROL METHODS FOR A RECIPROCATING AIR COMPRESSOR USED IN FUEL CELL AUXILIARY POWER UNIT (APU)  

E-Print Network [OSTI]

NOISE CONTROL METHODS FOR A RECIPROCATING AIR COMPRESSOR USED IN FUEL CELL AUXILIARY POWER UNIT Air pollution Noise pollution Engine life Remedy Fuel cell APU Quieter Low emissions Exhaust Heat, Case History: Noise control approaches for an air-compressor in a fuel-cell auxiliary power unit, Noise

Carver, Jeffrey C.

178

A Vlasov-Maxwell Solver to Study Microbunching Instability in the FERMI@ELETTRA First Bunch Compressor System  

E-Print Network [OSTI]

A Vlasov-Maxwell Solver to Study Microbunching Instability in the FERMI@ELETTRA First Bunch Compressor System

Bassi, G; Ellison, J A; Heinemann, K A

2008-01-01T23:59:59.000Z

179

Method for shallow junction formation  

DOE Patents [OSTI]

A doping sequence that reduces the cost and complexity of forming source/drain regions in complementary metal oxide silicon (CMOS) integrated circuit technologies. The process combines the use of patterned excimer laser annealing, dopant-saturated spin-on glass, silicide contact structures and interference effects creates by thin dielectric layers to produce source and drain junctions that are ultrashallow in depth but exhibit low sheet and contact resistance. The process utilizes no photolithography and can be achieved without the use of expensive vacuum equipment. The process margins are wide, and yield loss due to contact of the ultrashallow dopants is eliminated.

Weiner, Kurt H. (San Jose, CA)

1996-01-01T23:59:59.000Z

180

Method for shallow junction formation  

DOE Patents [OSTI]

A doping sequence is disclosed that reduces the cost and complexity of forming source/drain regions in complementary metal oxide silicon (CMOS) integrated circuit technologies. The process combines the use of patterned excimer laser annealing, dopant-saturated spin-on glass, silicide contact structures and interference effects creates by thin dielectric layers to produce source and drain junctions that are ultrashallow in depth but exhibit low sheet and contact resistance. The process utilizes no photolithography and can be achieved without the use of expensive vacuum equipment. The process margins are wide, and yield loss due to contact of the ultrashallow dopants is eliminated. 8 figs.

Weiner, K.H.

1996-10-29T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Compressor discharge bleed air circuit in gas turbine plants and related method  

DOE Patents [OSTI]

A gas turbine system that includes a compressor, a turbine component and a load, wherein fuel and compressor discharge bleed air are supplied to a combustor and gaseous products of combustion are introduced into the turbine component and subsequently exhausted to atmosphere. A compressor discharge bleed air circuit removes bleed air from the compressor and supplies one portion of the bleed air to the combustor and another portion of the compressor discharge bleed air to an exhaust stack of the turbine component in a single cycle system, or to a heat recovery steam generator in a combined cycle system. In both systems, the bleed air diverted from the combustor may be expanded in an air expander to reduce pressure upstream of the exhaust stack or heat recovery steam generator.

Anand, Ashok Kumar (Niskayuna, NY); Berrahou, Philip Fadhel (Latham, NY); Jandrisevits, Michael (Clifton Park, NY)

2002-01-01T23:59:59.000Z

182

Compressor discharge bleed air circuit in gas turbine plants and related method  

DOE Patents [OSTI]

A gas turbine system that includes a compressor, a turbine component and a load, wherein fuel and compressor discharge bleed air are supplied to a combustor and gaseous products of combustion are introduced into the turbine component and subsequently exhausted to atmosphere. A compressor discharge bleed air circuit removes bleed air from the compressor and supplies one portion of the bleed air to the combustor and another portion of the compressor discharge bleed air to an exhaust stack of the turbine component in a single cycle system, or to a heat recovery steam generator in a combined cycle system. In both systems, the bleed air diverted from the combustor may be expanded in an air expander to reduce pressure upstream of the exhaust stack or heat recovery steam generator.

Anand, Ashok Kumar (Niskayuna, NY); Berrahou, Philip Fadhel (Latham, NY); Jandrisevits, Michael (Clifton Park, NY)

2003-04-08T23:59:59.000Z

183

Josephson junction between anisotropic superconductors Roman G. Mints  

E-Print Network [OSTI]

Josephson junction between anisotropic superconductors Roman G. Mints School of Physics 50011 Received 1 February 1999 Sin-Gordon equation for Josephson junctions with arbitrary misaligned, the contacts have Josephson properties. Hence, physical charac- teristics of Josephson junctions

Mints, Roman G.

184

Superconducting Tunnel Junctions as Direct Detectors for Submillimeter Astronomy  

E-Print Network [OSTI]

Superconducting Tunnel Junctions as Direct Detectors for Submillimeter Astronomy A Dissertation 2008 by John Daniel Teufel. All rights reserved. #12;Abstract Superconducting Tunnel Junctions on the of performance of superconducting tunnel junctions (STJ) as direct detectors for submillimeter radiation. Over

185

IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 7, NO. 5, SEPTEMBER 1999 567 Centrifugal Compressor Surge and Speed Control  

E-Print Network [OSTI]

since surge limits the useful range of mass flows where the compressor operates stably. Large amplitude Compressor Surge and Speed Control Jan Tommy Gravdahl, Member, IEEE, and Olav Egeland, Member, IEEE Abstract--Previous work on stabilization of compressor surge is extended to include control of the angular velocity

Gravdahl, Jan Tommy

186

Performance analysis of a series of hermetic reciprocating compressors working with R290 (propane) and R407C  

E-Print Network [OSTI]

Performance analysis of a series of hermetic reciprocating compressors working with R290 (propane with propane as refrigerant are analyzed in terms of the compressor model developed by [E. Navarro, E. Granryd. In addition, a comparison study between propane and R407C was carried out for one compressor and the observed

Fernández de Córdoba, Pedro

187

Detector for flow abnormalities in gaseous diffusion plant compressors  

DOE Patents [OSTI]

A detector detects a flow abnormality in a plant compressor which outputs a motor current signal. The detector includes a demodulator/lowpass filter demodulating and filtering the motor current signal producing a demodulated signal, and first, second, third and fourth bandpass filters connected to the demodulator/lowpass filter, and filtering the demodulated signal in accordance with first, second, third and fourth bandpass frequencies generating first, second, third and fourth filtered signals having first, second, third and fourth amplitudes. The detector also includes first, second, third and fourth amplitude detectors connected to the first, second, third and fourth bandpass filters respectively, and detecting the first, second, third and fourth amplitudes, and first and second adders connected to the first and fourth amplitude detectors and the second and third amplitude detectors respectively, and adding the first and fourth amplitudes and the second and third amplitudes respectively generating first and second added signals. Finally, the detector includes a comparator, connected to the first and second adders, and comparing the first and second added signals and detecting the abnormal condition in the plant compressor when the second added signal exceeds the first added signal by a predetermined value.

Smith, Stephen F. (Loudon, TN); Castleberry, Kim N. (Harriman, TN)

1998-01-01T23:59:59.000Z

188

Detector for flow abnormalities in gaseous diffusion plant compressors  

DOE Patents [OSTI]

A detector detects a flow abnormality in a plant compressor which outputs a motor current signal. The detector includes a demodulator/lowpass filter demodulating and filtering the motor current signal producing a demodulated signal, and first, second, third and fourth bandpass filters connected to the demodulator/lowpass filter, and filtering the demodulated signal in accordance with first, second, third and fourth bandpass frequencies generating first, second, third and fourth filtered signals having first, second, third and fourth amplitudes. The detector also includes first, second, third and fourth amplitude detectors connected to the first, second, third and fourth bandpass filters respectively, and detecting the first, second, third and fourth amplitudes, and first and second adders connected to the first and fourth amplitude detectors and the second and third amplitude detectors respectively, and adding the first and fourth amplitudes and the second and third amplitudes respectively generating first and second added signals. Finally, the detector includes a comparator, connected to the first and second adders, and comparing the first and second added signals and detecting the abnormal condition in the plant compressor when the second added signal exceeds the first added signal by a predetermined value. 6 figs.

Smith, S.F.; Castleberry, K.N.

1998-06-16T23:59:59.000Z

189

Dark energy and Josephson junctions  

SciTech Connect (OSTI)

It has been recently claimed that dark energy can be (and has been) observed in laboratory experiments by measuring the power spectrum S{sub I}(?) of the noise current in a resistively shunted Josephson junction and that in new dedicated experiments, which will soon test a higher frequency range, S{sub I}(?) should show a deviation from the linear rising observed in the lower frequency region because higher frequencies should not contribute to dark energy. Based on previous work on theoretical aspects of the fluctuation-dissipation theorem, we carefully investigate these issues and show that these claims are based on a misunderstanding of the physical origin of the spectral function S{sub I}(?). According to our analysis, dark energy has never been (and will never be) observed in Josephson junctions experiments. We also predict that no deviation from the linear rising behavior of S{sub I}(?) will be observed in forthcoming experiments. Our findings provide new (we believe definite) arguments which strongly support previous criticisms.

Branchina, Vincenzo [Department of Physics, University of Catania, Via Santa Sofia 64, I-95123, Catania (Italy); Liberto, Marco Di; Lodato, Ivano, E-mail: vincenzo.branchina@ct.infn.it, E-mail: madiliberto@ssc.unict.it, E-mail: ivlodato@ssc.unict.it [Scuola Superiore di Catania, Via S. Nullo 5/i, Catania (Italy)

2009-08-01T23:59:59.000Z

190

Quantum Junction Solar Cells Jiang Tang,,  

E-Print Network [OSTI]

Quantum Junction Solar Cells Jiang Tang,, Huan Liu,, David Zhitomirsky,§ Sjoerd Hoogland,§ Xihua, 1037 Luoyu Road, Wuhan, Hubei 430074, China § Department of Electrical and Computer Engineering-type and p-type materials to create the first quantum junction solar cells. We present a family

191

M Station, Austin  

E-Print Network [OSTI]

SUNSHINE MATHON, M. Arch., LEED Homes AP Design + Development Director sunshine.mathon@foundcom.org FOUNDATION COMMUNITIES Austin, TX T.O.D. District Area T.O.D. District Area T.O.D. District Area T.O.D. District Area 8.5 ACRE SITE 5-1.../2 Acres Buildable Boggy Creek Floodplain 8.5 ACRE SITE 5-1/2 Acres Buildable Boggy Creek Floodplain 4 Acres Concrete Abandoned Grayfield M STATION 80% 2 & 3-Bedrooms 150 1,2 & 3-Bedroom Apts M STATION 80% 2 & 3-Bedrooms 150 1,2 & 3-Bedroom Apts...

Mathon, S.

2011-01-01T23:59:59.000Z

192

Parametric testing and evaluation of a free-piston Stirling engine/linear compressor system  

SciTech Connect (OSTI)

A 3 Kw free-piston Stirling engine (FPSE) driving a linear Rankine cycle vapor compressor has been under development by the Department of Energy, the Gas Research Institute and General Electric Company as a heat activated heat pump (HAHP) for residential applications since 1976. This paper presents data obtained from recent testing on the FPSE/linear compressor unit. System performance and engine/compressor matching and control tests and analyses are presented and discussed. Engine component performance and loss test data are also presented. A description of the low-cost real-time digital data acquisition system is included. Engine/compressor test results show maximum engine power levels over 3 Kw, close to the design goal of 3.2 Kw. However, maximum efficiency is approximately 25 percent, 5 points below the design goal. The test results are used to construct maps of engine performance and compressor performance. These maps support the engine/compressor matching techniques. Confirmation of the control system features needed to provide matched engine/compressor operation is presented. Loss measurements under engine oscillating flow conditions show that quasi-steady models of oscillating flow substantially underestimate losses, and that various Stirling engine models predict significantly different component losses. Both performance and component loss test results are combined with simulation trends to identify design improvements to the current hardware and the projected performance increases.

Chiu, W.; Antoniak, Z.; Hogan, J.

1983-08-01T23:59:59.000Z

193

Skate Station UF Services  

E-Print Network [OSTI]

friends, practice your English, and try new activities! Where: Skate Station Funworks We will be meeting and more orderly manner. Everyone will be served eventually. Fire Drills/Alarms: Whenever you hear a fire should park your bike in well-lighted areas and lock it up when you park it. The best lock is a U

Pilyugin, Sergei S.

194

Uniform Conversions of Operating Points and Characteristics of Compressor  

E-Print Network [OSTI]

In the paper, some aspects of the polytropic analysis are developed that concerned with various processes changing the thermodynamic state of flow of a real fluid and reduction of these processes to processes having a given temperature and pressure of a given real mixture at the inlet. It is shown that all parameters of the process can be converted under condition of full similarity of flow that is formulated in the paper. An operating point of a compressor represents such process. It is to emphasize that parameters of the reduced point include not only volume flow, speed and polytropic head, for which requirement of similarity of flow at inlet is sufficient, but also polytropic exponent, polytropic efficiency, outlet pressure and outlet temperature.

Ostromuhov, L A

2011-01-01T23:59:59.000Z

195

Operational Experience with a Cryogenic Axial-Centrifugal Compressor  

E-Print Network [OSTI]

The Large Hadron Collider (LHC), presently under construction at CERN, requires large refrigeration capacity at 1.8 K. Compression of gaseous helium at cryogenic temperatures is therefore inevitable. Together with subcontractors, Linde Kryotechnik has developed a prototype machine. This unit is based on a cryogenic axial-centrifugal compressor, running on ceramic ball bearings and driven by a variable-frequency electrical motor operating at ambient temperature. Integrated in a test facility for superconducting magnets the machine has been commissioned without major problems and successfully gone through the acceptance test in autumn 1995. Subsequent steps were initiated to improve efficiency of this prototype. This paper describes operating experience gained so far and reports on measured performance prior to and after constructional modifications.

Decker, L; Löhlein, K; Purtschert, W; Ziegler, B L; Lebrun, P; Tavian, L; Brunovsky, I; Tucek, L

1998-01-01T23:59:59.000Z

196

Hydraulic accumulator-compressor for geopressured enhanced oil recovery  

DOE Patents [OSTI]

A hydraulic accumulator-compressor vessel using geothermal brine under pressure as a piston to compress waste (CO.sub.2 rich) gas is used in a system having a plurality of gas separators in tandem to recover pipeline quality gas from geothermal brine. A first high pressure separator feeds gas to a membrance separator which separates low pressure waste gas from high pressure quality gas. A second separator produces low pressure waste gas. Waste gas from both separators is combined and fed into the vessel through a port at the top as the vessel is drained for another compression cycle. High pressure brine is then admitted into the vessel through a port at the bottom of the vessel. Check valves control the flow of low pressure waste gas into the vessel and high pressure waste gas out of the vessel.

Goldsberry, Fred L. (Spring, TX)

1988-01-01T23:59:59.000Z

197

Investigation of subsonic and supersonic flow in a radial inflow compressor  

E-Print Network [OSTI]

in Heridional Plane Velocity Vectors in Compressor Rotor Flow 4-a Section of Impeller Showing the Clearance 12 22 5 Impeller Profile with Diffuser; Pressure ratio-5. 0 . 27 6 Impeller Profile with Diffuser; Pressure ratio-3, 0 . 28 7 Impeller Profile... of radial flo? compressure as a source for the upply of high press~ r gases has, in the last decade, eouallcd. , if not surpassed, the more conventional typo compressor. Inherently, the radial flu~ compressor can produce a much higher pressure ratio per...

Bale, Yadiyurappa Siddaveerasetty

1970-01-01T23:59:59.000Z

198

Advanced industrial gas turbine technology readiness demonstration program. Phase II. Final report: compressor rig fabrication assembly and test  

SciTech Connect (OSTI)

The results of a component technology demonstration program to fabricate, assemble and test an advanced axial/centrifugal compressor are presented. This work was conducted to demonstrate the utilization of advanced aircraft gas turbine cooling and high pressure compressor technology to improve the performance and reliability of future industrial gas turbines. Specific objectives of the compressor component testing were to demonstrate 18:1 pressure ratio on a single spool at 90% polytropic efficiency with 80% fewer airfoils as compared to current industrial gas turbine compressors. The compressor design configuration utilizes low aspect ratio/highly-loaded axial compressor blading combined with a centrifugal backend stage to achieve the 18:1 design pressure ratio in only 7 stages and 281 axial compressor airfoils. Initial testing of the compressor test rig was conducted with a vaneless centrifugal stage diffuser to allow documentation of the axial compressor performance. Peak design speed axial compressor performance demonstrated was 91.8% polytropic efficiency at 6.5:1 pressure ratio. Subsequent documentation of the combined axial/centrifugal performance with a centrifugal stage pipe diffuser resulted in the demonstration of 91.5% polytropic efficiency and 14% stall margin at the 18:1 overall compressor design pressure ratio. The demonstrated performance not only exceeded the contract performance goals, but also represents the highest known demonstrated compressor performance in this pressure ratio and flow class. The performance demonstrated is particularly significant in that it was accomplished at airfoil loading levels approximately 15% higher than that of current production engine compressor designs. The test results provide conclusive verification of the advanced low aspect ratio axial compressor and centrifugal stage technologies utilized.

Schweitzer, J. K.; Smith, J. D.

1981-03-01T23:59:59.000Z

199

delta-biased Josephson tunnel junctions  

SciTech Connect (OSTI)

The behavior of a long Josephson tunnel junction drastically depends on the distribution of the dc bias current. We investigate the case in which the bias current is fed in the central point of a one-dimensional junction. Such junction configuration has been recently used to detect the persistent currents circulating in a superconducting loop. Analytical and numerical results indicate that the presence of fractional vortices leads to remarkable differences from the conventional case of uniformly distributed dc bias current. The theoretical findings are supported by detailed measurements on a number of delta-biased samples having different electrical and geometrical parameters.

Monaco, R.; Mygind, J.; Koshelets, V. P.; Dmitriev, P. [Istituto di Cibernetica del CNR, 80078 Pozzuoli (Italy) and Dipartimento di Fisica, Universita di Salerno, 84081 Baronissi (Italy); DTU Physics, Technical University of Denmark, B309, DK-2800 Lyngby (Denmark); Institute of Radio Engineering and Electronics, Russian Academy of Science, Mokhovaya 11, Bldg. 7, 125009 Moscow (Russian Federation)

2010-02-01T23:59:59.000Z

200

Hydrogen Filling Station  

SciTech Connect (OSTI)

Hydrogen is an environmentally attractive transportation fuel that has the potential to displace fossil fuels. The Freedom CAR and Freedom FUEL initiatives emphasize the importance of hydrogen as a future transportation fuel. Presently, Las Vegas has one hydrogen fueling station powered by natural gas. However, the use of traditional sources of energy to produce hydrogen does not maximize the benefit. The hydrogen fueling station developed under this grant used electrolysis units and solar energy to produce hydrogen fuel. Water and electricity are furnished to the unit and the output is hydrogen and oxygen. Three vehicles were converted to utilize the hydrogen produced at the station. The vehicles were all equipped with different types of technologies. The vehicles were used in the day-to-day operation of the Las Vegas Valley Water District and monitoring was performed on efficiency, reliability and maintenance requirements. The research and demonstration utilized for the reconfiguration of these vehicles could lead to new technologies in vehicle development that could make hydrogen-fueled vehicles more cost effective, economical, efficient and more widely used. In order to advance the development of a hydrogen future in Southern Nevada, project partners recognized a need to bring various entities involved in hydrogen development and deployment together as a means of sharing knowledge and eliminating duplication of efforts. A road-mapping session was held in Las Vegas in June 2006. The Nevada State Energy Office, representatives from DOE, DOE contractors and LANL, NETL, NREL were present. Leadership from the National hydrogen Association Board of Directors also attended. As a result of this session, a roadmap for hydrogen development was created. This roadmap has the ability to become a tool for use by other road-mapping efforts in the hydrogen community. It could also become a standard template for other states or even countries to approach planning for a hydrogen future. Project partners also conducted a workshop on hydrogen safety and permitting. This provided an opportunity for the various permitting agencies and end users to gather to share experiences and knowledge. As a result of this workshop, the permitting process for the hydrogen filling station on the Las Vegas Valley Water District’s land was done more efficiently and those who would be responsible for the operation were better educated on the safety and reliability of hydrogen production and storage. The lessons learned in permitting the filling station and conducting this workshop provided a basis for future hydrogen projects in the region. Continuing efforts to increase the working pressure of electrolysis and efficiency have been pursued. Research was also performed on improving the cost, efficiency and durability of Proton Exchange Membrane (PEM) hydrogen technology. Research elements focused upon PEM membranes, electrodes/catalysts, membrane-electrode assemblies, seals, bipolar plates, utilization of renewable power, reliability issues, scale, and advanced conversion topics. Additionally, direct solar-to-hydrogen conversion research to demonstrate stable and efficient photoelectrochemistry (PEC) hydrogen production systems based on a number of optional concepts was performed. Candidate PEC concepts included technical obstacles such as inefficient photocatalysis, inadequate photocurrent due to non-optimal material band gap energies, rapid electron-hole recombination, reduced hole mobility and diminished operational lifetimes of surface materials exposed to electrolytes. Project Objective 1: Design, build, operate hydrogen filling station Project Objective 2: Perform research and development for utilizing solar technologies on the hydrogen filling station and convert two utility vehicles for use by the station operators Project Objective 3: Increase capacity of hydrogen filling station; add additional vehicle; conduct safety workshop; develop a roadmap for hydrogen development; accelerate the development of photovoltaic components Project Objective 4:

Boehm, Robert F; Sabacky, Bruce; Anderson II, Everett B; Haberman, David; Al-Hassin, Mowafak; He, Xiaoming; Morriseau, Brian

2010-02-24T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Tuning a short coherence length Josephson junction through a  

E-Print Network [OSTI]

Tuning a short coherence length Josephson junction through a metal-insulator transition J. K University, Josephson Junction talk, 2001 #12;Josephson Tunnel Junctions · A Superconductor maintaining nonhysteretic behavior. J. K. Freericks, Georgetown University, Josephson Junction talk, 2001 S N

Freericks, Jim

202

THE USE OF SUPERCONDUCTING JUNCTIONS IN MAGNETOMETRY By J. CLARKE,  

E-Print Network [OSTI]

-8 gauss. In the second part, we discuss the properties of a type of Josephson junction in which] junctions in parallel. A Josephson junction consists of two superconductors separated by an insulating =|03C8|ei~, where 1 03C8|2 represents the density of condensed pairs. In a Josephson junction

Boyer, Edmond

203

JOSEPHSON JUNCTION MIXER USING AN EXTERNAL LOCAL OSCILLATOR (*)  

E-Print Network [OSTI]

255 JOSEPHSON JUNCTION MIXER USING AN EXTERNAL LOCAL OSCILLATOR (*) H. KANTER Electronic Research, studied the use of Josephson junctions as microwave mixers on the basis of the highly damped junction indicate that conversion as well as noise properties of Josephson junctions require more detailed studies

Paris-Sud XI, Université de

204

Tunnel junction multiple wavelength light-emitting diodes  

DOE Patents [OSTI]

A multiple wavelength LED having a monolithic cascade cell structure comprising at least two p-n junctions, wherein each of said at least two p-n junctions have substantially different band gaps, and electrical connector means by which said at least two p-n junctions may be collectively energized; and wherein said diode comprises a tunnel junction or interconnect. 5 figs.

Olson, J.M.; Kurtz, S.R.

1992-11-24T23:59:59.000Z

205

Tunnel junction multiple wavelength light-emitting diodes  

DOE Patents [OSTI]

A multiple wavelength LED having a monolithic cascade cell structure comprising at least two p-n junctions, wherein each of said at least two p-n junctions have substantially different band gaps, and electrical connector means by which said at least two p-n junctions may be collectively energized; and wherein said diode comprises a tunnel junction or interconnect.

Olson, Jerry M. (Lakewood, CO); Kurtz, Sarah R. (Golden, CO)

1992-01-01T23:59:59.000Z

206

Self-consistent modeling of charge redistributions in Josephson junctions  

E-Print Network [OSTI]

Self-consistent modeling of charge redistributions in Josephson junctions J. K. Freericks, Josephson Junction talk, 2000 #12;Josephson Proximity-Effect Junctions · A Superconductor-Normal metal, Georgetown University, Josephson Junction talk, 2000 S N S I I V V Ic #12;Andreev Bound States · At an N

Freericks, Jim

207

Superconductor-Correlated metal-Superconductor Josephson junctions  

E-Print Network [OSTI]

Superconductor-Correlated metal- Superconductor Josephson junctions for high-speed digital. Freericks, Georgetown University, Josephson Junction talk, 2002 #12;Josephson Tunnel Junctions). J. K. Freericks, Georgetown University, Josephson Junction talk, 2002 S I S I I V V Ic #12

Freericks, Jim

208

Self-consistent modeling of SINIS and SNSNS Josephson junctions  

E-Print Network [OSTI]

Self-consistent modeling of SINIS and SNSNS Josephson junctions J. K. Freericks Collaborators: Paul of Naval Research. J. K. Freericks, Georgetown University, Josephson Junction talk, 2000 #12;Josephson University, Josephson Junction talk, 2000 S I S I I V V Ic #12;Josephson Proximity-Effect Junctions

Freericks, Jim

209

A miniature free-piston engine/compressor Authors: Lei Tian1  

E-Print Network [OSTI]

engine. Keywords HCCI, Engine-compressor, Portable power supply, engine modeling, combustion modeling 1 for wearing. Our approach to this problem was to use homogeneous charge compression ignition (HCCI) driving

Durfee, William K.

210

Effects of rotor tip clearance on an embedded compressor stage performance  

E-Print Network [OSTI]

Compressor efficiency variation with rotor tip gap is assessed using numerical simulations on an embedded stage representative of that in a large industrial gas turbine with Reynolds number being approximately 2 x 106 to ...

Sakulkaew, Sitanun

2012-01-01T23:59:59.000Z

211

Characterization of unsteady loading due to impeller-diffuser interaction in centrifugal compressors  

E-Print Network [OSTI]

Time dependent simulations are used to characterize the unsteady impeller blade loading due to imipeller-diffuser interaction in centrifugal compressor stages. The capability of simulations are assessed by comparing results ...

Lusardi, Christopher (Christopher Dean)

2012-01-01T23:59:59.000Z

212

A novel design methodology for enhanced compressor performance based on a dynamic stability metric  

E-Print Network [OSTI]

(cont.) compressor design optimization framework allows a versatile definition of the objective function such that any combination of pressure ratio, efficiency and dynamic stability can be prescribed at various operating ...

Castiella Ruiz de Velasco, Juan Carlos, 1978-

2005-01-01T23:59:59.000Z

213

Effect of circumferential groove casing treatment parameters on axial compressor flow range  

E-Print Network [OSTI]

The impact on compressor flow range of circumferential casing grooves of varying groove depth, groove axial location, and groove axial extent is assessed against that of a smooth casing wall using computational experiments. ...

Hanley, Brian K. (Brian Kyle)

2010-01-01T23:59:59.000Z

214

Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors  

E-Print Network [OSTI]

The effects of two types of flow nonuniformity on stall inception behavior were assessed with linearized stability analyses of two compressor flow models. Response to rotating tip clearance asymmetries induced by a whirling ...

Gordon, Kenneth A. (Kenneth Andrew), 1970-

1999-01-01T23:59:59.000Z

215

Electrical Power Savings in Pump and Compressor Networks via Load Management  

E-Print Network [OSTI]

Large industrial plants commonly use multiple parallel units in pump and compressor networks for improved reliability. Sometimes, installed equipment capacity can far exceed actual requirements. This excess capacity can be translated into energy...

Kumana, J. D.; Aseeri, A. S.

2005-01-01T23:59:59.000Z

216

Characterization of the flow field response to vaneless space reduction in centrifugal compressors  

E-Print Network [OSTI]

The unsteady three-dimensional flow field for two centrifugal compressors of nearly identical design (one with a marginally smaller impeller-diffuser gap) is interrogated to assess the difference in the time averaged ...

Villanueva V., Alfonso D. (Villanueva Villarreal)

2006-01-01T23:59:59.000Z

217

Using Outside Air for Flooded Oil Screw Compressors at an Industrial Facility  

E-Print Network [OSTI]

A study has been performed to determine if inlet air temperature provides an increase in compressor efficiency, seen through reduced power for some specified mass flow. A theoretical analysis suggests that power is not a function of volumetric flow...

Hunt, D. G.; Terry, S.

2014-01-01T23:59:59.000Z

218

Forced response of a centrifugal compressor stage due to the impeller-diffuser interaction  

E-Print Network [OSTI]

The unsteady pressure field experienced by a centrifugal compressor stage can be dominated by of the impeller-diffuser interaction. The energy of the unsteady field, under certain aerodynamic and structural conditions, is ...

Walton, Edward James

2014-01-01T23:59:59.000Z

219

Approaches Toward Achieving Optimum Efficiency in Rerates of Large Centrifugal Compressors  

E-Print Network [OSTI]

Centrifugal compressors are commonly used within the process industries as prime movers. For many years, plants have been designed with "single train", unspared, major machinery in order to reduce construction, operating, and maintenance costs...

Rudisel, D. A.

220

Estimation of axial compressor body forces using three-dimensional flow computations  

E-Print Network [OSTI]

This thesis presents an examination of body force distributions in a single stage low speed compressor. The body force distributions are developed using two different computational procedures, an axisymmetric streamline ...

Reichstein, Georg A

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Effects of upstream wake phasing on the performance of transonic compressors  

E-Print Network [OSTI]

The effect of the upstream wake phase on the work input (i.e., rise in stagnation enthalpy across the blade row) of a transonic rotor is examined computationally and analytically. It is found that the compressor work depends ...

Nolan, Sean Patrick Rock

2009-01-01T23:59:59.000Z

222

Adjustable Speed- A Tool for Saving Energy Losses in Pumps, Fans, Fans, Blowers and Compressors  

E-Print Network [OSTI]

Petroleum and chemical plants of today are effectively cutting energy losses in their plants thermally, electrically, and mechanically in their process equipment. In rotating process equipment such as pumps, fans, compressors, and blowers, much...

Hickok, H. N.

223

Optoelectronic switching of addressable molecular crossbar junctions  

E-Print Network [OSTI]

This letter reports on the observation of optoelectronic switching in addressable molecular crossbar junctions fabricated using polymer stamp-printing method. The active medium in the junction is a molecular self-assembled monolayer softly sandwiched between gold electrodes. The molecular junctions are investigated through currentvoltage measurements at varied temperature (from 95 to 300 K) in high vacuum condition. The junctions show reversible optoelectronic switching with the highest on/off ratio of 3 orders of magnitude at 95 K. The switching behavior is independent of both optical wavelength and molecular structure, while it strongly depends on the temperature. Initial analysis indicates that the distinct binding nature of the molecule/electrode interfaces play a dominant role in the switching performance.

J. C. Li

2006-11-22T23:59:59.000Z

224

Pacific Southwest Research Station Publications  

E-Print Network [OSTI]

Bulletins 1- 28 1965-1989 Soil- Vegetation Tables -- 1965-1980 Solar Irradiation and Shadow Length Tables-1971 1938 California Forest and Range Experiment Station Annual Report 1939 California Forest and Range Experiment Station Annual Report 1940 California Forest and Range Experiment Station Annual Report 1951

Standiford, Richard B.

225

Quantum Coherence in a Superfluid Josephson Junction  

SciTech Connect (OSTI)

We report a new kind of experiment in which we take an array of nanoscale apertures that form a superfluid {sup 4}He Josephson junction and apply quantum phase gradients directly along the array. We observe collective coherent behaviors from aperture elements, leading to quantum interference. Connections to superconducting and Bose-Einstein condensate Josephson junctions as well as phase coherence among the superfluid aperture array are discussed.

Narayana, Supradeep; Sato, Yuki [Rowland Institute at Harvard, Harvard University, Cambridge, Massachusetts 02142 (United States)

2011-02-04T23:59:59.000Z

226

Refrigeration system with a compressor-pump unit and a liquid-injection desuperheating line  

DOE Patents [OSTI]

The refrigeration system includes a compressor-pump unit and/or a liquid-injection assembly. The refrigeration system is a vapor-compression refrigeration system that includes an expansion device, an evaporator, a compressor, a condenser, and a liquid pump between the condenser and the expansion device. The liquid pump improves efficiency of the refrigeration system by increasing the pressure of, thus subcooling, the liquid refrigerant delivered from the condenser to the expansion device. The liquid pump and the compressor are driven by a single driving device and, in this regard, are coupled to a single shaft of a driving device, such as a belt-drive, an engine, or an electric motor. While the driving device may be separately contained, in a preferred embodiment, the liquid pump, the compressor, and the driving device (i.e., an electric motor) are contained within a single sealable housing having pump and driving device cooling paths to subcool liquid refrigerant discharged from the liquid pump and to control the operating temperature of the driving device. In another aspect of the present invention, a liquid injection assembly is included in a refrigeration system to divert liquid refrigerant from the discharge of a liquid pressure amplification pump to a compressor discharge pathway within a compressor housing to desuperheat refrigerant vapor to the saturation point within the compressor housing. The liquid injection assembly includes a liquid injection pipe with a control valve to meter the volume of diverted liquid refrigerant. The liquid injection assembly may also include a feedback controller with a microprocessor responsive to a pressure sensor and a temperature sensor both positioned between the compressor to operate the control valve to maintain the refrigerant at or near saturation.

Gaul, Christopher J. (Thornton, CO)

2001-01-01T23:59:59.000Z

227

New SLED 3 system for Multi-mega Watt RF compressor  

E-Print Network [OSTI]

A compact X band SLED is introduced for X band RF compressing application. This SLED compressor consists two major parts: a rectangular to circular waveguide converter and an overmoded spherical cavity. The RF compressor is designed to convert 50 magawatt X band RF power with pulse length 1.5 microseconds and deliver 200 megawatts with pulse length 106 nanoseconds to the X band accelerating structure.

Xu, Chen; Tantawi, Sami

2014-01-01T23:59:59.000Z

228

Thermodynamic modeling and optimization of a screw compressor chiller and cooling tower system  

E-Print Network [OSTI]

THERMODYNAMIC MODELING AND OPTIMIZATION OF A SCREW COMPRESSOR CHILLER AND COOLING TOWER SYSTEM A Thesis by RHETT DAVID GRAVES Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 2003 Major Subject: Mechanical Engineering THERMODYNAMIC MODELING AND OPTIMIZATION OF A SCREW COMPRESSOR CHILLER AND COOLING TOWER SYSTEM A Thesis by RHETT DAVID GRAVES Submitted to Texas A&M University in partial...

Graves, Rhett David

2004-09-30T23:59:59.000Z

229

Compressor and Hot Section Fouling in Gas Turbines- Causes and Effects  

E-Print Network [OSTI]

COMPRESSOR AND BOT SECTION FOOLING IN GAS TURBINES - CAUSES AND EPFECTS CYRUS B. MEHER-HOMJI Manager, Advanced Technology Boyce Engineering International, Inc. Houston, Texas ABSTRACT The fouling of axial flow compressors and turbines is a... serious operating problem in gas turbine eng ines. These prime movers are being increasingly used in cogeneration applications and with the large air mass flow rate (e.g. 633 Lbs/Sec for a 80 MWe gas turbine) foulants even in the ppm range can cause...

Meher-Homji, C. B.

230

Reducing Air Compressor Work by Using Inlet Air Cooling and Dehumidification  

E-Print Network [OSTI]

. These compressors can account for a significant portion of a manufacturing facility?s electric consumption and any increase in efficiency can lead to economic benefits. Air compressors are sensitive to ambient conditions, as evidenced by the fact... fall as low as 20% below their 4 rated generation capacity (standard ISO power output at 59?F ambient) when temperatures are over 95?F. Further, warmer days result in increased electric power demand due to the need for household cooling. In order...

Hardy, Mark James

2011-02-22T23:59:59.000Z

231

Development of Versatile Compressor Modeling using Approximation Techniques for Alternative Refrigerants Evaluation  

SciTech Connect (OSTI)

Refrigerants are the life-blood of vapor compression systems that are widely used in Heating, Ventilation, Air-Conditioning, and Refrigeration (HVAC&R) applications. The HVAC&R community is currently transitioning from main-stream refrigerants that have high Global Warming Potential (GWP) to alternative lower-GWP refrigerants. During this transition, it is important to account for the life cycle climate performance of alternative refrigerants since their performance will be different than that of higher-GWP refrigerants. This requires the evaluation of the system performance with the new refrigerants. Unfortunately, it is extremely difficult to predict the realistic performance of new alternative refrigerants without experimental validation. One of the main challenges in this regard is modeling the compressor performance with high fidelity due to the complex interaction of operating parameters, geometry, boundary conditions, and fluid properties. High fidelity compressor models are computationally expensive and require significant pre-processing to evaluate the performance of alternative refrigerants. This paper presents a new approach to modeling compressor performance when alternative refrigerants are used. The new modeling concept relies on using existing compressor performance to create an approximate model that captures the dependence of compressor performance on key operating parameters and fluid properties. The model can be built using a myriad of approximation techniques. This paper focuses on Kriging-based techniques to develop higher fidelity approximate compressor models. Baseline and at least one alternative refrigerant performance data are used to build the model. The model accuracy was evaluated by comparing the model results with compressor performance data using other refrigerants. Preliminary results show that the approximate model can predict the compressor mass flow rate and power consumption within 5%.

Abdelaziz, Omar [ORNL] [ORNL; Shrestha, Som S [ORNL] [ORNL

2014-01-01T23:59:59.000Z

232

Multi-junction solar cell device  

DOE Patents [OSTI]

A multi-junction solar cell device (10) is provided. The multi-junction solar cell device (10) comprises either two or three active solar cells connected in series in a monolithic structure. The multi-junction device (10) comprises a bottom active cell (20) having a single-crystal silicon substrate base and an emitter layer (23). The multi-junction device (10) further comprises one or two subsequent active cells each having a base layer (32) and an emitter layer (23) with interconnecting tunnel junctions between each active cell. At least one layer that forms each of the top and middle active cells is composed of a single-crystal III-V semiconductor alloy that is substantially lattice-matched to the silicon substrate (22). The polarity of the active p-n junction cells is either p-on-n or n-on-p. The present invention further includes a method for substantially lattice matching single-crystal III-V semiconductor layers with the silicon substrate (22) by including boron and/or nitrogen in the chemical structure of these layers.

Friedman, Daniel J. (Lakewood, CO); Geisz, John F. (Wheat Ridge, CO)

2007-12-18T23:59:59.000Z

233

Compressor and Turbine Models of Brayton Units for Space Nuclear Power Systems  

SciTech Connect (OSTI)

Closed Brayton Cycles with centrifugal flow, single-shaft turbo-machines are being considered, with gas cooled nuclear reactors, to provide 10's to 100's of electrical power to support future space exploration missions and Lunar and Mars outposts. Such power system analysis is typically based on the cycle thermodynamics, for given operating pressures and temperatures and assumed polytropic efficiencies of the compressor and turbine of the Brayton energy conversion units. Thus the analysis results not suitable for modeling operation transients such as startup and changes in the electric load. To simulate these transients, accurate models of the turbine and compressor in the Brayton rotating unit, which calculate the changes in the compressor and turbine efficiencies with system operation are needed. This paper presents flow models that account for the design and dimensions of the compressor impeller and diffuser, and the turbine stator and rotor blades. These models calculate the various enthalpy losses and the polytropic efficiencies along with the pressure ratios of the turbine and compressor. The predictions of these models compare well with reported performance data of actual hardware. In addition, the results of a parametric analysis to map the operations of the compressor and turbine, as functions of the rotating shaft speed and inlet Mach number of the gas working fluid, are presented and discussed. The analysis used a binary mixture of He-Xe with a molecular weight of 40 g/mole as the working fluid.

Gallo, Bruno M.; El-Genk, Mohamed S.; Tournier, Jean-Michel [Institute for Space and Nuclear Power Studies, University of New Mexico, Albuquerque, NM, 87131 (United States); Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, NM, 87131 (United States)

2007-01-30T23:59:59.000Z

234

Apparatus and methods for cooling and sealing rotary helical screw compressors  

DOE Patents [OSTI]

In a compression system which incorporates a rotary helical screw compressor, and for any type of gas or refrigerant, the working liquid oil is atomized through nozzles suspended in, and parallel to, the suction gas flow, or alternatively the nozzles are mounted on the suction piping. In either case, the aim is to create positively a homogeneous mixture of oil droplets to maximize the effectiveness of the working liquid oil in improving the isothermal and volumetric efficiencies. The oil stream to be atomized may first be degassed at compressor discharge pressure by heating within a pressure vessel and recovering the energy added by using the outgoing oil stream to heat the incoming oil stream. The stripped gas is typically returned to the compressor discharge flow. In the preferred case, the compressor rotors both contain a hollow cavity through which working liquid oil is injected into channels along the edges of the rotors, thereby forming a continuous and positive seal between the rotor edges and the compressor casing. In the alternative method, working liquid oil is injected either in the same direction as the rotor rotation or counter to rotor rotation through channels in the compressor casing which are tangential to the rotor edges and parallel to the rotor center lines or alternatively the channel paths coincide with the helical path of the rotor edges. 14 figs.

Fresco, A.N.

1997-08-05T23:59:59.000Z

235

Apparatus and methods for cooling and sealing rotary helical screw compressors  

DOE Patents [OSTI]

In a compression system which incorporates a rotary helical screw compressor, and for any type of gas or refrigerant, the working liquid oil is atomized through nozzles suspended in, and parallel to, the suction gas flow, or alternatively the nozzles are mounted on the suction piping. In either case, the aim is to create positively a homogeneous mixture of oil droplets to maximize the effectiveness of the working liquid oil in improving the isothermal and volumetric efficiencies. The oil stream to be atomized may first be degassed at compressor discharge pressure by heating within a pressure vessel and recovering the energy added by using the outgoing oil stream to heat the incoming oil stream. The stripped gas is typically returned to the compressor discharge flow. In the preferred case, the compressor rotors both contain a hollow cavity through which working liquid oil is injected into channels along the edges of the rotors, thereby forming a continuous and positive seal between the rotor edges and the compressor casing. In the alternative method, working liquid oil is injected either in the same direction as the rotor rotation or counter to rotor rotation through channels in the compressor casing which are tangential to the rotor edges and parallel to the rotor centerlines or alternatively the channel paths coincide with the helical path of the rotor edges.

Fresco, Anthony N. (P.O. Box 734, Upton, NY 11973)

1997-01-01T23:59:59.000Z

236

IMPROVEMENT TO PIPELINE COMPRESSOR ENGINE RELIABILITY THROUGH RETROFIT MICRO-PILOT IGNITION SYSTEM  

SciTech Connect (OSTI)

This report documents a 3-year research program conducted by the Engines & Energy Conversion Laboratory (EECL) at Colorado State University (CSU) to develop micropilot ignition systems for existing pipeline compressor engines. Research activities for the overall program were conducted with the understanding that the efforts are to result in a commercial product to capture and disseminate the efficiency and environmental benefits of this new technology. An extensive state-of-art review was conducted to leverage the existing body of knowledge of micropilot ignition with respect to retrofit applications. Additionally, commercially-available fuel injection products were identified and applied to the program where appropriate. This approach will minimize the overall time-to-market requirements, while meeting performance and cost criteria. The objective for Phase I was to demonstrate the feasibility of micropilot ignition for large bore, slow speed engines operating at low compression ratios under laboratory conditions at the EECL. The primary elements of Micropilot Phase I were to develop a single-cylinder test chamber to study the injection of pilot fuel into a combustion cylinder and to develop, install and test a multi-cylinder micropilot ignition system for a 4-cylinder, natural gas test engine. In all, there were twelve (12) tasks defined and executed to support these two (2) primarily elements in a stepwise fashion. Task-specific approaches and results are documented in this report. The four-cylinder prototype data was encouraging for the micro-pilot ignition technology when compared to spark ignition. The objective for Phase II was to further develop and optimize the micropilot ignition system at the EECL for large bore, slow speed engines operating at low compression ratios. The primary elements of Micropilot Phase II were to evaluate the results for the 4-cylinder system prototype developed for Phase I, then optimize this system and prepare the technology for the field demonstration phase in Year 3. In all, there were twelve (12) tasks defined and executed to support objectives in a stepwise fashion. The optimized four-cylinder system data demonstrated significant progress compared to Phase I results, as well as traditional spark ignition systems. These laboratory results were enhanced, then verified via a field demonstration project during Phase III of the Micropilot Ignition program. An Implementation Team of qualified engine retrofit service providers was assembled to install the retrofit micropilot ignition system on an engine operated by El Paso Pipeline Group at a compressor station near Window Rock, Arizona. Testing of this demonstration unit showed that the same benefits identified by laboratory testing at CSU, i.e., reduced fuel consumption and exhaust emissions (NOx, THC, CO, and CH2O). Commercialization of the retrofit micropilot ignition technology is awaiting a ''market pull'', which is expected to materialize as the results of the field demonstration become known and accepted. The Implementation Team, comprised of Woodward Governor Company, Enginuity LLC, Hoerbiger Corporation of America, and DigiCon Inc., has direct experience with the technology development and implementation, and stands ready to promote and commercialize the retrofit micropilot ignition system.

Scott Chase; Daniel Olsen; Ted Bestor

2005-05-01T23:59:59.000Z

237

Development of a test station for a device combined from an insufflator and a compressor, basing on an  

E-Print Network [OSTI]

. Additionally a FMEA was carried out to locate, quantify and eliminate or minimize risks. Results: The result

Berlin,Technische Universität

238

Thermodynamic Signatures of Half-Quantum Vortices in p+ip Josephson Junction Arrays  

E-Print Network [OSTI]

bind a Majorana Fermion . . 3 Josephson Junction Arrays 3.14 p + ip Josephson Junction Arrays 4.1Bind a Majorana Fermion . . . . . . . . . Josephson Junction

Krahn, Graham Joel

2012-01-01T23:59:59.000Z

239

Temporal stability of Y Ba Cu O nano Josephson junctions from ion irradiation  

E-Print Network [OSTI]

planar high temperature Josephson junctions fabricated usingYBa 2 Cu 3 O 7-? Josephson junctions via nanolithography andsuperconductor Josephson junctions,” J. Vac. Sci. Technol.

Cybart, Shane A.

2014-01-01T23:59:59.000Z

240

E-Print Network 3.0 - addressable three-way junctions Sample...  

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

junctions can... Project Description: page 1 Project Description I. Introduction: Josephson junction networks Over... the past 25 years, superconducting Josephson junctions...

Note: This page contains sample records for the topic "junction compressor station" 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

Transit Infrastructure Finance Through Station Location Auctions  

E-Print Network [OSTI]

Numerous route and station options Strong real estate marketreal estate market Transit friendly constituents Numerous route and station options

Ian Carlton

2009-01-01T23:59:59.000Z

242

Reliability Design and Case Study of a Refrigerator Compressor Subjected to Repetitive Loads, International Journal of Refrigeration  

E-Print Network [OSTI]

A newly designed crankshaft of a compressor for a side-by-side (SBS) refrigerator was studied. Using mass and energy conservation balances, a variety of compressor loads typically found in a refrigeration cycle were analyzed. The laboratory failure... vis-a´-vis de la fiabilite´ et e´tude de casArticle history: Received 18 March 2008 Received in revised form 6 May 2008 Accepted 21 July 2008 Published online 31 July 2008 Keywords: Refrigeration system Compression system Reciprocating compressor...

Woo, S.; O'Neal, D.L.; Pecht, M.

243

A Lossless Fuzzy Binary AND/OR Compressor  

E-Print Network [OSTI]

In this report, a new fuzzy 2bit-AND parallel-to-OR, or simply, a fuzzy binary AND/OR (FBAR) text data compression model as an algorithm is suggested for bettering spatial locality limits on nodes during database transactions. The current model incorporates a four-layer application technique: string-to-AND/OR pairwise binary bit + fuzzy quantum with noise conversions. This technique promotes a lossless data compression ratio of 2:1 up to values approximately = 3:1, generating a spatially-efficient compressed data file compared to nowadays data compressors. Data decompression/specific data reconstruction initiates an AND/OR pattern match technique in respect of fuzzy quantum indicators in the binary function field. The reconstruction of data occurs in the 4th layer using encryption methods. It is hypothesized that significant data compression ratio of 2n:1 for n>3:1 ratios, e.g., 32~64:1 are achievable via fuzzy qubit indexing over classical byte blocks for every bit position fragmented into a (1/2 upper +1/2 ...

Alipour, Philip B

2009-01-01T23:59:59.000Z

244

Hydrogen Energy Stations: Poly-Production of Electricity, Hydrogen, and Thermal Energy  

E-Print Network [OSTI]

compressor Compressed hydrogen storage Figure 2: High-compressor Compressed hydrogen storage Clean Energy Group lduction, and a hydrogen compression, storage, and Energy

Lipman, Timothy; Brooks, Cameron

2006-01-01T23:59:59.000Z

245

Compressor Calorimeter Test of R-404A Alternatives ARM-31a, D2Y-65, L-40, and R32 + R-134a Mixture using a Scroll Compressor  

SciTech Connect (OSTI)

As a contribution to the AHRI Low-GWP Alternative Refrigerants Evaluation Program (AREP), this study compares the performance of four lower-GWP alternative refrigerants, ARM-31a, D2Y-65, L-40, and R-32 + R-134a mixture, to that of refrigerant R-404A (baseline) in a scroll compressor designed for medium temperature refrigeration applications. These comparisons were carried out via compressor calorimeter tests performed on a compressor designed for refrigerant R-404A and having a nominal rated capacity of 23,500 Btu/hr. Tests were conducted over a suction dew point temperature range of -10 F to 35 F in 5 F increments and a discharge dew point temperature range of 70 F to 140 F in 10 F increments. All the tests were performed with 20 F superheat, 40 F superheat, and 65 F suction temperature. A liquid subcooling level of 10 F to 15 F was maintained for all the test conditions. However, the cooling capacities reported in this study are normalized for 0 F subcooling. The tests showed that the compressor energy efficiency ratio (EER) and cooling capacity with all four alternative refrigerants tested are higher at higher saturation suction and saturation discharge temperature and lower at lower saturation suction and saturation discharge temperature, compared to that of R-404A. Discharge temperatures of all the alternative refrigerants were higher than that of R-404A at all test conditions.

Shrestha, Som S [ORNL; Sharma, Vishaldeep [ORNL; Abdelaziz, Omar [ORNL

2013-08-01T23:59:59.000Z

246

A GIS-based Assessment of Coal-based Hydrogen Infrastructure Deployment in the State of Ohio  

E-Print Network [OSTI]

the stations include compressors, hydrogen storage andthan compressors to supply pressurized gaseous hydrogen to

Johnson, Nils; Yang, Christopher; Ogden, J

2009-01-01T23:59:59.000Z

247

Decoherence in a Josephson junction qubit  

E-Print Network [OSTI]

The zero-voltage state of a Josephson junction biased with constant current consists of a set of metastable quantum energy levels. We probe the spacings of these levels by using microwave spectroscopy to enhance the escape rate to the voltage state. The widths of the resonances give a measurement of the coherence time of the two states involved in the transitions. We observe a decoherence time shorter than that expected from dissipation alone in resonantly isolated 20 um x 5 um Al/AlOx/Al junctions at 60 mK. The data is well fit by a model including dephasing effects of both low-frequency current noise and the escape rate to the continuum voltage states. We discuss implications for quantum computation using current-biased Josephson junction qubits, including the minimum number of levels needed in the well to obtain an acceptable error limit per gate.

A. J. Berkley; H. Xu; M. A. Gubrud; R. C. Ramos; J. R. Anderson; C. J. Lobb; F. C. Wellstood

2003-03-01T23:59:59.000Z

248

Junction-side illuminated silicon detector arrays  

DOE Patents [OSTI]

A junction-side illuminated detector array of pixelated detectors is constructed on a silicon wafer. A junction contact on the front-side may cover the whole detector array, and may be used as an entrance window for light, x-ray, gamma ray and/or other particles. The back-side has an array of individual ohmic contact pixels. Each of the ohmic contact pixels on the back-side may be surrounded by a grid or a ring of junction separation implants. Effective pixel size may be changed by separately biasing different sections of the grid. A scintillator may be coupled directly to the entrance window while readout electronics may be coupled directly to the ohmic contact pixels. The detector array may be used as a radiation hardened detector for high-energy physics research or as avalanche imaging arrays.

Iwanczyk, Jan S.; Patt, Bradley E.; Tull, Carolyn

2004-03-30T23:59:59.000Z

249

Numerical Investigation of Josephson Junction Structures  

SciTech Connect (OSTI)

Multilayered long Josephson Junction Structures form an interesting physical system where both nonlinearity and interaction between subsystems play an important role. Such systems allow to study physical effects that do not occur in single Josephson junction.The Sakai-Bodin-Pedersen model--a system of perturbed sine-Gordon equations--is used to study the dynamic states of stacks of inductively coupled long Josephson Junctions (LJJs). The corresponding static problem is numerically investigated as well. In order to study the stability of possible static solutions a Sturm-Liouville problem is generated and solved.The transitions from static to dynamic state and the scenario of these transitions are analyzed depending on the model parameters. Different physical characteristics--current-voltage characteristics, individual instant voltages and internal magnetic fields, are calculated and interpreted.

Hristov, I.; Dimova, S.; Boyadjiev, T. [Faculty of Mathematics and Informatics, Sofia University 5 James Bourchier Blvd., 1164 Sofia (Bulgaria)

2009-10-29T23:59:59.000Z

250

Wachs Cutter Tooling Station (4495)  

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

purchase, build and install Wachs cutter tooling. The Wachs Cutter Tooling Station is similar to previously operated facility tooling and will utilize an existing hydraulic unit....

251

Station design using orifice meters  

SciTech Connect (OSTI)

This paper reports that proper meter station design using gas orifice meters must include consideration of a number of factors to minimize operation and maintenance problems while obtaining the best accuracy over the life of the station. A station should provide accuracy, be safe, functional, economical and free of undue maintenance. It should comply with all codes, reports and specifications but most of all it should be able to comply with terms set forth in the contract. All measuring stations should be designed with considerations of growth or reductions in volume. It should be attractive and built to last for many years.

Upp, E.L. (Daniel Industries, Inc., Houston, TX (United States))

1992-07-01T23:59:59.000Z

252

Dynamical properties of high-temperature-superconductor granular bridge junctions: Inhomogeneous Josephson-junction-array model  

SciTech Connect (OSTI)

As an attempt to understand the dynamical behavior of the high-temperature-superconductor (HTSC) granular bridge junction, we model the granular HTSC bridge junction consisting of many small grains inside by an inhomogeneous Josephson junction array, i.e., randomly arranged Josephson junction arrays (JJA). To describe randomly distributed critical currents between the grains inside the HTSC granular bridge junction, we chose various possible configurations in {l_brace}{ital I}{sub {ital ij}}{sup {ital c}}{r_brace} and {l_brace}{ital R}{sub {ital ij}}{r_brace} for the one-dimensional (1D) and 2D inhomogeneous Josephson junctions, and calculated the current-voltage ({ital IV}) characteristics and self-radiation spectral densities of the 1D and 2D inhomogeneous Josephson junctions. As a result, depending upon the distribution of critical currents and shunted resistances, it is found that there are large variations of {ital IV} characteristics. In contrast to the appearance of giant Shapiro steps in the regular ordered array, such Shapiro steps disappear in the case of the disordered JJA due to the increased randomness in the distribution of critical currents. On the contrary, however, when there exists a correlation between critical currents and resistances, i.e., a constant Josephson voltage, {ital I}{sub {ital ij}}{sup {ital c}}{ital R}{sub {ital ij}}={ital V}{sub {ital J}} (constant), the fundamental Shapiro step emerges despite the disordered distribution of {ital I}{sub {ital ij}}{sup {ital c}}. The relevance of this model to the HTSC granular bridge junctions is discussed. In particular, experimentally observed dynamical behaviors of the HTSC granular bridge junctions are shown to be closely related to the case of the correlated distribution with constant Josephson voltage. {copyright} {ital 1996 The American Physical Society.}

Lee, J.; Lee, S.; Yu, J.; Park, G. [Department of Physics, Sogang University, Seoul 121-742 (Korea)] [Department of Physics, Sogang University, Seoul 121-742 (Korea)

1996-02-01T23:59:59.000Z

253

INCREASED FLEXIBILITY OF TURBO-COMPRESSORS IN NATURAL GAS TRANSMISSION THROUGH DIRECT SURGE CONTROL  

SciTech Connect (OSTI)

The objective of this Direct Surge Control project was to develop a new internal method to avoid surge of pipeline compressors. This method will safely expand the range and flexibility of compressor operations, while minimizing wasteful recycle flow at the lower end of the operating envelope. The approach is to sense the onset of surge with a probe that directly measures re-circulation at the impeller inlet. The signals from the probe are used by a controller to allow operation at low flow conditions without resorting to a predictive method requiring excessive margin to activate a recycle valve. The sensor developed and demonstrated during this project was a simple, rugged, and sensitive drag probe. Experiments conducted in a laboratory compressor clearly showed the effectiveness of the technique. Subsequent field demonstrations indicated that the increase in range without the need to recycle flow was on the order of 19% to 25%. The cost benefit of applying the direct surge control technology appears to be as much as $120 per hour per compressor for operation without the current level of recycle flow. This could amount to approximately $85 million per year for the U.S. Natural Gas Transmission industry, if direct surge control systems are applied to most pipeline centrifugal compressors.

Robert J. McKee; Shane P. Siebenaler; Danny M. Deffenbaugh

2005-02-25T23:59:59.000Z

254

Complementary junction heterostructure field-effect transistor  

DOE Patents [OSTI]

A complimentary pair of compound semiconductor junction heterostructure field-effect transistors and a method for their manufacture are disclosed. The p-channel junction heterostructure field-effect transistor uses a strained layer to split the degeneracy of the valence band for a greatly improved hole mobility and speed. The n-channel device is formed by a compatible process after removing the strained layer. In this manner, both types of transistors may be independently optimized. Ion implantation is used to form the transistor active and isolation regions for both types of complimentary devices. The invention has uses for the development of low power, high-speed digital integrated circuits.

Baca, Albert G. (Albuquerque, NM); Drummond, Timothy J. (Albuquerque, NM); Robertson, Perry J. (Albuquerque, NM); Zipperian, Thomas E. (Albuquerque, NM)

1995-01-01T23:59:59.000Z

255

Axion physics in a Josephson junction environment  

E-Print Network [OSTI]

We show that recent experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits have a cosmological interpretation in terms of axionic dark matter physics, in the sense that they allow for analogue simulation of early-universe axion physics. We propose new experimental setups in which SQUID-like axionic interactions in a resonant Josephson junction environment can be tested, similar in nature to recent experiments that test for quantum entanglement of two coupled Josephson qubits. We point out that the parameter values relevant for early-universe axion cosmology are accessible with present day's achievements in nanotechnology.

Christian Beck

2011-11-23T23:59:59.000Z

256

Complementary junction heterostructure field-effect transistor  

DOE Patents [OSTI]

A complimentary pair of compound semiconductor junction heterostructure field-effect transistors and a method for their manufacture are disclosed. The p-channel junction heterostructure field-effect transistor uses a strained layer to split the degeneracy of the valence band for a greatly improved hole mobility and speed. The n-channel device is formed by a compatible process after removing the strained layer. In this manner, both types of transistors may be independently optimized. Ion implantation is used to form the transistor active and isolation regions for both types of complimentary devices. The invention has uses for the development of low power, high-speed digital integrated circuits. 10 figs.

Baca, A.G.; Drummond, T.J.; Robertson, P.J.; Zipperian, T.E.

1995-12-26T23:59:59.000Z

257

Phase Transition in Compact QED(3) and the Josephson Junction  

E-Print Network [OSTI]

We study the finite temperature phase transition in 2+1 dimensional compact QED and its dual theory: Josephson junction. Duality of these theories at zero temperature was established long time ago by Hosotani. Phase transition in compact QED is well studied and we employ the `duality' to study the superconductivity phase transition in a Josephson junction. For a thick junction we obtain a critical temperature in terms of the geometrical properties of the junction.

Vakif K. Onemli; Murat Tas; Bayram Tekin

2001-08-22T23:59:59.000Z

258

Holographic Josephson Junction in 3+1 dimensions  

E-Print Network [OSTI]

In arXiv:1101.3326[hep-th], a (2+1)-dimensional holographic Josephson junction was constructed, and it was shown that the DC Josephson current is proportional to the sine of the phase difference across the junction. In this paper, we extend this study to a holographic description for the (3+1)-dimensional holographic DC Josephson junction. By solving numerically the coupled differential equations, we also obtain the familiar characteristics of Josephson junctions.

Yong-Qiang Wang; Yu-Xiao Liu; Zhen-Hua Zhao

2011-04-21T23:59:59.000Z

259

Holographic Josephson Junction in 3+1 dimensions  

E-Print Network [OSTI]

In arXiv:1101.3326[hep-th], a (2+1)-dimensional holographic Josephson junction was constructed, and it was shown that the DC Josephson current is proportional to the sine of the phase difference across the junction. In this paper, we extend this study to a holographic description for the (3+1)-dimensional holographic DC Josephson junction. By solving numerically the coupled differential equations, we also obtain the familiar characteristics of Josephson junctions.

Wang, Yong-Qiang; Zhao, Zhen-Hua

2011-01-01T23:59:59.000Z

260

Theory of Proximity Effect in Junctions with Unconventional Superconductors  

E-Print Network [OSTI]

Theory of Proximity Effect in Junctions with Unconventional Superconductors Relevance to odd)Singlet superconductor junctions ()Triplet superconductor junctions [PRB 70, 012507 (2004), PRB71 024506 spectroscopy of Unconventional superconductors Tunneling spectroscopy has phase sensitivity px- wave dx2 -y2

Fominov, Yakov

Note: This page contains sample records for the topic "junction compressor station" 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

SOME CHARACTERISTICS OF JOSEPHSON JUNCTIONS AS RADIATION DETECTORS  

E-Print Network [OSTI]

125 SOME CHARACTERISTICS OF JOSEPHSON JUNCTIONS AS RADIATION DETECTORS Yu. Ya. DIVIN, F. Ya. NAD les microponts. Abstract. 2014 The V-I characteristic of Josephson junction with an external parallel admittance, the high frequency impedance and high frequency response of a Josephson junction to small

Paris-Sud XI, Université de

262

PARAMETRIC EXCITATION OF PLASMA OSCILLATIONS IN JOSEPHSON JUNCTIONS  

E-Print Network [OSTI]

223 PARAMETRIC EXCITATION OF PLASMA OSCILLATIONS IN JOSEPHSON JUNCTIONS N. F. PEDERSEN, M. R'équation différentielle de Mathieu. Abstract. 2014 Experiments on a Josephson junction analog showed a parametric in Josephson junctions at finite voltages have been discussed earlier [1]-[4]. In this communication we report

Boyer, Edmond

263

JOSEPHSON JUNCTION DETECTOR FOR ASTRONOMICAL APPLICATIONS B. T. ULRICH  

E-Print Network [OSTI]

111 JOSEPHSON JUNCTION DETECTOR FOR ASTRONOMICAL APPLICATIONS B. T. ULRICH Department of Astronomy at the NRAO 11 m telescope. The detector uses a point contact Josephson junction, with a niobium point against-band Josephson junction radiometer for the 1.0 to 1.6 mm spectral region, and have used it to make astronomical

Paris-Sud XI, Université de

264

AN ELECTRONIC EQUIVALENT SCHEME OF A JOSEPHSON JUNCTION  

E-Print Network [OSTI]

AN ELECTRONIC EQUIVALENT SCHEME OF A JOSEPHSON JUNCTION C. K. BAK Physics Laboratory I. A lot of phenomena observed in Josephson junctions are easily identified in the « equi- valent circuit ~. The lock range Ji corresponds to the supercurrent in a Josephson junction. The loop gain A(co) can

Paris-Sud XI, Université de

265

Josephson junction simulation of neurons Patrick Crotty,1  

E-Print Network [OSTI]

Josephson junction simulation of neurons Patrick Crotty,1 Dan Schult,2 and Ken Segall1 1 Physics of neurons, we present superconducting circuits containing Josephson junctions that model biologically technologies, large interconnected networks of Josephson junction neurons would operate fully in parallel

Segall, Ken

266

Superconductor-Correlated metal-Superconductor Josephson junctions  

E-Print Network [OSTI]

Superconductor-Correlated metal- Superconductor Josephson junctions for high-speed digital. Freericks, Georgetown University, Josephson Junction talk, 2002 #12;Digital Electronics and RSFQ logic, Georgetown University, Josephson Junction talk, 2002 X X Binary 0, no flux Binary 1, one flux quantum #12

Freericks, Jim

267

Localized mode interactions in 0-Josephson junctions Hadi Susanto1  

E-Print Network [OSTI]

Localized mode interactions in 0- Josephson junctions Hadi Susanto1 and Gianne Derks2 1 School of Mathematics, University of Surrey, Guildford, Surrey, GU2 7XH, UK A long Josephson junction containing regions in the system, it is shown that Josephson junctions with phase-shift can be an ideal setting for studying

Wirosoetisno, Djoko

268

Superconductor-Correlated metal-Superconductor Josephson junctions  

E-Print Network [OSTI]

Superconductor-Correlated metal- Superconductor Josephson junctions for high-speed digital. Freericks, Georgetown University, Josephson Junction talk, 2003 #12;Digital Electronics and RSFQ logic, Georgetown University, Josephson Junction talk, 2003 X X Binary 0, no flux Binary 1, one flux quantum #12

Freericks, Jim

269

Multi-Scroll and Hypercube Attractors from Josephson Junctions  

E-Print Network [OSTI]

Multi-Scroll and Hypercube Attractors from Josephson Junctions M¨us¸tak E. Yalc¸in Istanbul Leuven, Belgium Email: Johan.Suykens@esat.kuleuven.ac.be Abstract-- In this paper Josephson junctions of the Josephson junction in a general Jerk circuit in such a way that there is no need for synthesizing

270

EA-0930: Facility Operations at the U.S. DOE Grand Junction Projects Office, Grand Junction, Colorado  

Broader source: Energy.gov [DOE]

This EA evaluates the environmental impacts of the proposal to expand and upgrade the U.S. Department of Energy's Grand Junction Projects Office facilities and operations in Grand Junction, Colorado.

271

Variable gas spring for matching power output from FPSE to load of refrigerant compressor  

DOE Patents [OSTI]

The power output of a free piston Stirling engine is matched to a gas compressor which it drives and its stroke amplitude is made relatively constant as a function of power by connecting a gas spring to the drive linkage from the engine to the compressor. The gas spring is connected to the compressor through a passageway in which a valve is interposed. The valve is linked to the drive linkage so it is opened when the stroke amplitude exceeds a selected limit. This allows compressed gas to enter the spring, increase its spring constant, thus opposing stroke increase and reducing the phase lead of the displacer ahead of the piston to reduce power output and match it to a reduced load power demand.

Chen, Gong (Athens, OH); Beale, William T. (Athens, OH)

1990-01-01T23:59:59.000Z

272

Development of a Hybrid Compressor/Expander Module for Automotive Fuel Cell Applications  

SciTech Connect (OSTI)

In this program TIAX LLC conducted the development of an advanced technology compressor/expander for supplying compressed air to Proton Exchange Membrane (PEM) fuel cells in transportation applications. The overall objective of this program was to develop a hybrid compressor/expander module, based on both scroll and high-speed turbomachinery technologies, which will combine the strengths of each technology to create a concept with superior performance at minimal size and cost. The resulting system was expected to have efficiency and pressure delivery capability comparable to that of a scroll-only machine, at significantly reduced system size and weight when compared to scroll-only designs. Based on the results of detailed designs and analyses of the critical system elements, the Hybrid Compressor/Expander Module concept was projected to deliver significant improvements in weight, volume and manufacturing cost relative to previous generation systems.

McTaggart, Paul

2004-12-31T23:59:59.000Z

273

Variable gas spring for matching power output from FPSE to load of refrigerant compressor  

DOE Patents [OSTI]

The power output of a free piston Stirling engine is matched to a gas compressor which it drives and its stroke amplitude is made relatively constant as a function of power by connecting a gas spring to the drive linkage from the engine to the compressor. The gas spring is connected to the compressor through a passageway in which a valve is interposed. The valve is linked to the drive linkage so it is opened when the stroke amplitude exceeds a selected limit. This allows compressed gas to enter the spring, increase its spring constant, thus opposing stroke increase and reducing the phase lead of the displacer ahead of the piston to reduce power output and match it to a reduced load power demand. 6 figs.

Chen, G.; Beale, W.T.

1990-04-03T23:59:59.000Z

274

Fuel Station Procedure Applicability All  

E-Print Network [OSTI]

Fuel Station Procedure Applicability All Last Revised 11/20/12 Procedure Owner Andrew Grant agrant for the purchasing and distribution of fuel for vehicles owned by Bowling Green State University (BGSU). This centralization is important to ensure compliance for BGSU employees who use the centralized fuel station and fuel

Moore, Paul A.

275

Improving performance and rotordynamic characteristics of injection compressors via much longer balance-piston and division-wall seals  

E-Print Network [OSTI]

Predictions are presented for a selected compressor using longer hole-pattern seals with L/D ratios from 0.5 to 2.5. Results were obtained for back-to-back and in-line compressors with the seal located at mid-span and at 82% of rotor span...

Rodrigues Rodrigues, Margarita

2009-05-15T23:59:59.000Z

276

Test results of performance and oil circulation rate of commercial reciprocating compressors of different capacities working with  

E-Print Network [OSTI]

others. The compressors used POE oil as lubricant and additional oil circulation rate (OCR) testsTest results of performance and oil circulation rate of commercial reciprocating compressors at steady state conditions were done to evaluate possible effects and differences to the traditionally used

Fernández de Córdoba, Pedro

277

Research and development of energy-efficient appliance motor-compressors. Final report. Volume 1: executive summary  

SciTech Connect (OSTI)

The accomplishments of the refrigerator/freezer motor-compressor development program are highlighted. The experimental program involved making numerous incremental changes to an existing compresssor design. The refrigerator/freezer motor compressor experimental development, room air conditioner experimental development, market study, and phase II field demonstration program are summarized. (MHR)

Nelson, R.T.; MacCarthy, P.W.

1980-09-01T23:59:59.000Z

278

Gas Spring Losses in Linear Clearance Seal Compressors P.B. Bailey, M.W. Dadd, J.S. Reed*  

E-Print Network [OSTI]

with a clearance seal linear compressor attached to a plain gas spring volume. The static flow through1 Gas Spring Losses in Linear Clearance Seal Compressors P.B. Bailey, M.W. Dadd, J.S. Reed* , C A fundamental loss mechanism in cryocoolers is associated with compression and expansion processes

279

Topological Order in Frustrated Josephson Junction Arrays  

E-Print Network [OSTI]

We show that electrically and magnetically frustrated Josephson junction arrays (JJAs) realize topological order with a non-trivial ground state degeneracy on manifolds with non-trivial topology. The low-energy theory has the same gauge dynamics of the unfrustrated JJAs but for different, "fractional" degrees of freedom, a principle reminescent of Jain's composite electrons in the fractional quantum Hall effect.

M. C. Diamantini; P. Sodano; C. A. Trugenberger

2008-06-02T23:59:59.000Z

280

Superconducting Topological Fluids in Josephson Junction Arrays  

E-Print Network [OSTI]

We argue that the frustrated Josephson junction arrays may support a topologically ordered superconducting ground state, characterized by a non-trivial ground state degeneracy on the torus. This superconducting quantum fluid provides an explicit example of a system in which superconductivity arises from a topological mechanism rather than from the usual Landau-Ginzburg mechanism.

M. Cristina Diamantini; Pasquale Sodano; Carlo A. Trugenberger

2006-04-21T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Gallium nitride junction field-effect transistor  

DOE Patents [OSTI]

An all-ion implanted gallium-nitride (GaN) junction field-effect transistor (JFET) and method of making the same. Also disclosed are various ion implants, both n- and p-type, together with or without phosphorous co-implantation, in selected III-V semiconductor materials.

Zolper, John C. (Albuquerque, NM); Shul, Randy J. (Albuquerque, NM)

1999-01-01T23:59:59.000Z

282

Axion mass estimates from resonant Josephson junctions  

E-Print Network [OSTI]

Recently it has been proposed that dark matter axions from the galactic halo can produce a small Shapiro step-like signal in Josephson junctions whose Josephson frequency resonates with the axion mass [C. Beck, PRL 111, 231801 (2013)]. Here we show that the axion field equations in a voltage-driven Josephson junction environment allow for a nontrivial solution where the axion-induced electric current manifests itself as an oscillating supercurrent. The linear change of phase associated with this nontrivial solution implies the existence of a large magnetic field in a tiny surface area of the weak link region of the junction which makes incoming axions decay into microwave photons. We derive a condition for the design of Josephson junction experiments so that they can act as optimum axion detectors. Four independent recent experiments are discussed in this context. The observed Shapiro step anomalies of all four experiments consistently point towards an axion mass of $(110 \\pm 2)\\mu $eV. This mass value is com...

Beck, Christian

2014-01-01T23:59:59.000Z

283

Fast algorithms for triangular Josephson junction arrays  

SciTech Connect (OSTI)

We develop fast algorithms for the numerical study of two-dimensional triangular Josephson junction arrays. The Dirac bra-ket formalism is introduced in the context of such arrays. We note that triangular arrays can have both hexagonal and rectangular periodicity and develop algorithms for each. Boundaries are next introduced and fast algorithms for finite arrays are developed. 40 refs., 4 figs.

Datta, S.; Sahdev, D. [Indian Institute of Technology, Kanpur (India)] [Indian Institute of Technology, Kanpur (India)

1997-04-01T23:59:59.000Z

284

Measuring Vacuum Polarization with Josephson Junctions  

SciTech Connect (OSTI)

We argue that the vacuum polarization by the virtual electron-positron pairs can be measured by studying a Josephson junction in a strong magnetic field. The vacuum polarization results in a weak dependence of the Josephson constant on the magnetic field strength which is within the reach of the existing experimental techniques.

Penin, Alexander A. [Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1 (Canada) and Institute for Nuclear Research of Russian Academy of Sciences, 117312 Moscow (Russian Federation)

2010-03-05T23:59:59.000Z

285

Axion mass estimates from resonant Josephson junctions  

E-Print Network [OSTI]

Recently it has been proposed that dark matter axions from the galactic halo can produce a small Shapiro step-like signal in Josephson junctions whose Josephson frequency resonates with the axion mass [C. Beck, PRL 111, 231801 (2013)]. Here we show that the axion field equations in a voltage-driven Josephson junction environment allow for a nontrivial solution where the axion-induced electric current manifests itself as an oscillating supercurrent. The linear change of phase associated with this nontrivial solution implies the formal existence of a large magnetic field in a tiny surface area of the weak link region of the junction which makes incoming axions decay into microwave photons. We derive a condition for the design of Josephson junction experiments so that they can act as optimum axion detectors. Four independent recent experiments are discussed in this context. The observed Shapiro step anomalies of all four experiments consistently point towards an axion mass of $(110 \\pm 2)\\mu $eV. This mass value is compatible with the recent BICEP2 results and implies that Peccei-Quinn symmetry breaking was taking place after inflation.

Christian Beck

2014-06-10T23:59:59.000Z

286

A high throughput (>90%), large compensation range, single-prism femtosecond pulse compressor  

E-Print Network [OSTI]

We demonstrate a high throughput, large compensation range, single-prism femtosecond pulse compressor, using a single prism and two roof mirrors. The compressor has zero angular dispersion, zero spatial dispersion, zero pulse-front tilt, and unity magnification. The high efficiency is achieved by adopting two roof mirrors as the retroreflectors. We experimentally achieved ~ -14500 fs2 group delay dispersion (GDD) with 30 cm of prism tip-roof mirror prism separation, and ~90.7% system throughput with the current implementation. With better components, the throughput can be even higher.

Kong, Lingjie

2013-01-01T23:59:59.000Z

287

High efficiency, low frequency linear compressor proposed for Gifford-McMahon and pulse tube cryocoolers  

SciTech Connect (OSTI)

In order to reduce the amount of greenhouse gas emissions, which are most likely the cause of substantial global warming, a reduction of overall energy consumption is crucial. Low frequency Gifford-McMahon and pulse tube cryocoolers are usually powered by a scroll compressor together with a rotary valve. It has been theoretically shown that the efficiency losses within the rotary valve can be close to 50%{sup 1}. In order to eliminate these losses we propose to use a low frequency linear compressor, which directly generates the pressure wave without using a rotary valve. First results of this development will be presented.

Höhne, Jens [Pressure Wave Systems GmbH, Häberlstr. 8, 80337 Munich (Germany)

2014-01-29T23:59:59.000Z

288

Research and development of energy-efficient appliance motor-compressors. Volume IV. Production demonstration and field test  

SciTech Connect (OSTI)

Two models of a high-efficiency compressor were manufactured in a pilot production run. These compressors were for low back-pressure applications. While based on a production compressor, there were many changes that required production process changes. Some changes were performed within our company and others were made by outside vendors. The compressors were used in top mount refrigerator-freezers and sold in normal distribution channels. Forty units were placed in residences for a one-year field test. Additional compressors were built so that a life test program could be performed. The results of the field test reveal a 27.0% improvement in energy consumption for the 18 ft/sup 3/ high-efficiency model and a 15.6% improvement in the 21 ft/sup 3/ improvement in the 21 ft/sup 3/ high-efficiency model as compared to the standard production unit.

Middleton, M.G.; Sauber, R.S.

1983-09-01T23:59:59.000Z

289

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

4-12: Hydrogen Cost Comparison for Electrolysis Station Withthe hydrogen costs from the HSCM for electrolysis stations

Weinert, Jonathan X.; Lipman, Timothy

2006-01-01T23:59:59.000Z

290

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

control valves in the storage system lines, and ensure theSize Cost vs. Size for Storage System Size (kg) PV=100 PV=Equipment Purifier Storage System Compressor Dispenser

Lipman, T E; Weinert, Jonathan X.

2006-01-01T23:59:59.000Z

291

Hydrogen Refueling Station Costs in Shanghai  

E-Print Network [OSTI]

Costs Annualized Investment Cost, 1000$/yr Total AnnualizedH2 Fueling Stations Investment Cost Cost ($/yr) OperatingH2 Fueling Stations Investment Cost Cost ($/kg) Operating

Weinert, Jonathan X.; Shaojun, Liu; Ogden, J; Jianxin, Ma

2006-01-01T23:59:59.000Z

292

Energy Department Launches Alternative Fueling Station Locator...  

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

Launches Alternative Fueling Station Locator App Energy Department Launches Alternative Fueling Station Locator App November 7, 2013 - 11:16am Addthis As part of the Obama...

293

Bulk-Flow analysis for force and moment coefficients of a shrouded centrifugal compressor impeller  

E-Print Network [OSTI]

An analysis is developed for a compressible bulk-flow model of the leakage path between a centrifugal compressor's impeller shroud and housing along the front and back side of the impeller. This is an extension of analysis performed first by Childs...

Gupta, Manoj Kumar

2005-08-29T23:59:59.000Z

294

An Electron Bunch Compressor Based on an FEL Interaction in the Far Infra Red  

E-Print Network [OSTI]

In this note an electron bunch compressor is proposed based on FEL type interaction of the electron bunch with far infrared (FIR) radiation. This mechanism maintains phase space density and thus requires a high quality electron beam to produce bunches of the length of a few ten micrometer.

Gaupp, Andreas

2013-01-01T23:59:59.000Z

295

Tip clearance flows in axial compressors: stall inception and stability enhancement  

E-Print Network [OSTI]

The flow in the rotor tip clearance gap in an axial compressor influences the loss levels and the stall onset point. The role of tip clearance flows in the stall inception process is still debated, though. The aim of this thesis is to improve...

Weichert, Stephanie April

2012-02-07T23:59:59.000Z

296

Modeling and Control of a Free Liquid-Piston Engine Compressor  

E-Print Network [OSTI]

Modeling and Control of a Free Liquid-Piston Engine Compressor Chao Yong, Eric J. Barth, José A Nashville, TN, USA ABSTRACT This paper presents the modeling and control of a prototype compact free liquid-piston of the free piston, and 6) the compression and pumping dynamics. The model is then utilized to design

Barth, Eric J.

297

OPTIMAL CONTROL EXPERIMENTATION OF COMPRESSION TRAJECTORIES FOR A LIQUID PISTON AIR COMPRESSOR  

E-Print Network [OSTI]

compressor is the critical part of a Compressed Air En- ergy Storage (CAES) system. Efficient and fast and expansion has many applications in pneumatic and hydraulic systems, including in the Compressed Air Energy CAES system, high pressure (20-30MPa) compressed air is stored in a dual chamber storage vessel

Li, Perry Y.

298

Tiled-Grating Compressor with Uncompensated Dispersion for Near-Field-Intensity Smoothing  

SciTech Connect (OSTI)

A tiled-grating compressor, in which the spatial dispersion is not completely compensated, reduces the near-field-intensity modulation caused by tiling gaps and provides near-field spatial filtering of the input laser beam, thus reducing the laser damage to the final optics.

Huang, H.; Kessler, T.J.

2007-07-02T23:59:59.000Z

299

EVLA Memo #168 Assessing the Impact of Using Three Cryogenic Compressors on the  

E-Print Network [OSTI]

a set of eight cryogenically cooled receivers that cover the continuous frequency range 1­50 GHz. TableEVLA Memo #168 Assessing the Impact of Using Three Cryogenic Compressors on the Performance temperature and system temperature measurements for the eight cryogeni- cally cooled receivers of a subset

Groppi, Christopher

300

1275, Page 1 ANALYSIS AND DEVELOPMENT OF A TURBIVO COMPRESSOR FOR MVR  

E-Print Network [OSTI]

The mechanical vapor recompression is an efficient process to decrease energy consumption of drying processes efficiencies. 1. INTRODUCTION One third of European homes use clothes dryers, which energy consumption is one dryers is the use of a compressor with high efficiency in an open cycle and at high evaporating

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "junction compressor station" 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

EVLA Memo #168 Assessing the Impact of Using Three Cryogenic Compressors on the  

E-Print Network [OSTI]

a set of eight cryogenically cooled receivers that cover the continuous frequency range 1--50 GHz. TableEVLA Memo #168 Assessing the Impact of Using Three Cryogenic Compressors on the Performance temperature and system temperature measurements for the eight cryogeni­ cally cooled receivers of a subset

Groppi, Christopher

302

On active surge control of compressors using a mass flow Bjrnar Bhagen and Jan Tommy Gravdahl  

E-Print Network [OSTI]

can cause severe damage to the ma- chine due to vibrations and high thermal loading re- sulting from of a centrifugal compressor driven by an electrical motor and the control system consists of three parts expensive and hampered with high noise levels. For this reason we propose a nonlinear observer

Gravdahl, Jan Tommy

303

Three-dimensional hybrid grid generator and unstructured flow solver for compressors and turbines  

E-Print Network [OSTI]

/Output control panel. : : : : : : : : : : : : : : : : : : : 87 19 GUI: Geometry panel. : : : : : : : : : : : : : : : : : : : : : : : : : : 87 20 GUI: Execution control panel. : : : : : : : : : : : : : : : : : : : : : : 88 21 Test case airfoil... by Wieghardt and Tillmann. The computed result is based on the k ?! model. : : : : : : : : : : : : : : : : : : : 123 46 Detail of the Honeywell centrifugal compressor impeller geometry. : : 125 47 Computational grid...

Kim, Kyusup

2005-02-17T23:59:59.000Z

304

INCREASED FLEXIBILITY OF TURBO-COMPRESSORS IN NATURAL GAS TRANSMISSION THROUGH DIRECT SURGE CONTROL  

SciTech Connect (OSTI)

This preliminary phase 1 report summarizes the background and the work on the ''Increased Flexibility of Turbo-Compressors in Natural Gas Transmission through Direct Surge Control'' project to date. The importance of centrifugal compressors for natural gas transmission is discussed, and the causes of surge and the consequences of current surge control approaches are explained. Previous technology development, including findings from early GMRC research, previous surge detection work, and selected publications, are presented. The project is divided into three Phases to accomplish the project objectives of verifying near surge sensing, developing a prototype surge control system (sensor and controller), and testing/demonstrating the benefits of direct surge control. Specification for the direct surge control sensor and controller developed with guidance from the industry Oversight Committee is presented in detail. Results of CFD modeling conducted to aid in interpreting the laboratory test results are shown and explained. An analysis of the system dynamics identified the data sampling and handling requirements for direct surge control. A detailed design process for surge detection probes has been developed and explained in this report and has been used to prepare drag probes for the laboratory compressor test and the first field test. The surge detection probes prepared for testing have been bench tested and flow tested to determine and calibrate their sensitivity to flow forces as shown in data presented in this report. The surge detection drag probes have been shown to perform as expected and as required to detect approaching surge. Laboratory test results of surge detection in the SwRI centrifugal compressor demonstrated functionality of the surge detection probes and a change in the impeller inlet flow pattern prior to surge. Although the recirculation cannot be detected because of the specific geometry of this compressor, there are changes that indicate the approach of surge that can be detected. Preparations for a field test had been completed at one point in the project. However, a failure of the surge probe wiring just inside the compressor case has caused a delay in the field testing. Repairs for the wiring in the compressor have been scheduled and the field test will take place shortly after the repairs.

Robert J. McKee

2003-05-01T23:59:59.000Z

305

Dissipation and traversal time in Josephson junctions  

SciTech Connect (OSTI)

The various ways of evaluating dissipative effects in macroscopic quantum tunneling are re-examined. The results obtained by using functional integration, while confirming those of previously given treatments, enable a comparison with available experimental results relative to Josephson junctions. A criterion based on the shortening of the semiclassical traversal time tau of the barrier with regard to dissipation can be established, according to which DELTAtau/tau > or approx. N/Q, where Q is the quality factor of the junction and N is a numerical constant of order unity. The best agreement with the experiments is obtained for N=1.11, as it results from a semiempirical analysis based on an increase in the potential barrier caused by dissipative effects.

Cacciari, Ilaria; Ranfagni, Anedio [Istituto di Fisica Applicata 'Nello Carrara' del Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze (Italy); Moretti, Paolo [Istituto dei Sistemi Complessi del Consiglio Nazionale delle Ricerche, Sezione di Firenze, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze (Italy)

2010-05-01T23:59:59.000Z

306

Screening current effects in Josephson junction arrays  

E-Print Network [OSTI]

The purpose of this work is to compare the dynamics of arrays of Josephson junctions in presence of magnetic field in two different frameworks: the so called XY frustrated model with no self inductance and an approach that takes into account the screening currents (considering self inductances only). We show that while for a range of parameters the simpler model is sufficiently accurate, in a region of the parameter space solutions arise that are not contained in the XY model equations.

A. Petraglia; G. Filatrella; G. Rotoli

1995-07-28T23:59:59.000Z

307

q-deformed dynamics and Josephson junction  

E-Print Network [OSTI]

We define a generalized rate equation for an observable in quantum mechanics, that involves a parameter q and whose limit $q\\to 1$ gives the standard Heisenberg equation. The generalized rate equation is used to study dynamics of current biased Josephson junction. It is observed that this toy model incorporates diffraction like effects in the critical current. Physical interpretation for q is provided which is also shown to be q-deformation parameter.

Ramandeep S. Johal

2000-10-04T23:59:59.000Z

308

Defect formation in long Josephson junctions  

SciTech Connect (OSTI)

We study numerically a mechanism of vortex formation in a long Josephson junction within the framework of the one-dimensional sine-Gordon model. This mechanism is switched on below the critical temperature. It is shown that the number of fluxons versus velocity of cooling roughly scales according to the power law with the exponent of either 0.25 or 0.5 depending on the temperature variation in the critical current density.

Gordeeva, Anna V. [Institute for Physics of Microstructures, RAS, GSP-105, Nizhny Novgorod 603950 (Russian Federation); Department of Physics, B309, Technical University of Denmark, DK-2800 Lyngby (Denmark); Pankratov, Andrey L. [Institute for Physics of Microstructures, RAS, GSP-105, Nizhny Novgorod 603950 (Russian Federation)

2010-06-01T23:59:59.000Z

309

Quantum dynamics in the bosonic Josephson junction  

SciTech Connect (OSTI)

We employ a semiclassical picture to study dynamics in a bosonic Josephson junction with various initial conditions. Phase diffusion of coherent preparations in the Josephson regime is shown to depend on the initial relative phase between the two condensates. For initially incoherent condensates, we find a universal value for the buildup of coherence in the Josephson regime. In addition, we contrast two seemingly similar on-separatrix coherent preparations, finding striking differences in their convergence to classicality as the number of particles increases.

Chuchem, Maya; Cohen, Doron [Department of Physics, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105 (Israel); Smith-Mannschott, Katrina [Department of Physics, Wesleyan University, Middletown, Connecticut 06459 (United States); MPI for Dynamics and Self-Organization, Bunsenstrasse 10, D-37073 Goettingen (Germany); Hiller, Moritz [Physikalisches Institut, Albert-Ludwigs-Universitaet, Hermann-Herder-Strasse 3, D-79104 Freiburg (Germany); Kottos, Tsampikos [Department of Physics, Wesleyan University, Middletown, Connecticut 06459 (United States); Vardi, Amichay [Department of Chemistry, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105 (Israel); Institute for Theoretical Atomic, Molecular and Optical Physics, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

2010-11-15T23:59:59.000Z

310

Compressor calorimeter performance of refrigerant blends: Comparative methods and results for a refrigerator/freezer application  

SciTech Connect (OSTI)

A protocol was developed to define calorimeter operating pressures for nonazeotropic refrigerant mixtures (NARMs) which corresponded with the saturated evaporator and condenser temperatures commonly used for pure refrigerants. Compressor calorimeter results were obtained using this equivalent-mean-temperature (EMT) approach and a generally applied Association of Home Appliance Manufacturers (AHAM) procedure at conditions characteristic of a domestic refrigerator-freezer application. Tests with R-12 and two NARMs indicate that compressor volumetric and isentropic efficiencies are nearly the same for refrigerants with similar capacities and pressure ratios. The liquid-line temperature conditions specified in the AHAM calorimeter rating procedure for refrigerator-freezer compressors were found to preferentially derate NARM performance relative to R-12. Conversion of calorimeter data taken with a fixed liquid-line temperature to a uniform minimal level of condenser subcooling is recommended as a fairer procedure when NARMs are involved. Compressor energy-efficiency-ratio (EER) and capacity data measured as a result of the EMT approach were compared to system performance calculated using an equivalent-heat-exchanger-loading (EHXL) protocol based on a Lorenz-Meutzner (L-M) refrigerator-freezer modeling program. The EHXL protocol was used to transform the calorimeter results into a more relevant representation of potential L-M cycle performance. The EMT method used to set up the calorimeter tests and the AHAM liquid-line conditions combined to significantly understate the cycle potential of NARMs relative to that predicted at the more appropriate EHXL conditions. Compressor conditions representative of larger heat exchanger sizes were also found to give a smaller L-M cycle advantage relative to R-12.

Rice, C K; Sand, J R

1993-01-01T23:59:59.000Z

311

Josephson junction in a thin film  

SciTech Connect (OSTI)

The phase difference {phi}(y) for a vortex at a line Josephson junction in a thin film attenuates at large distances as a power law, unlike the case of a bulk junction where it approaches exponentially the constant values at infinities. The field of a Josephson vortex is a superposition of fields of standard Pearl vortices distributed along the junction with the line density {phi}'(y)/2{pi}. We study the integral equation for {phi}(y) and show that the phase is sensitive to the ratio l/{Lambda}, where l={lambda}{sub J}{sup 2}/{lambda}{sub L}, {Lambda}=2{lambda}{sub L}{sup 2}/d, {lambda}{sub L}, and {lambda}{sub J} are the London and Josephson penetration depths, and d is the film thickness. For l<<{Lambda}, the vortex ''core'' of the size l is nearly temperature independent, while the phase ''tail'' scales as l{Lambda}/y{sup 2}={lambda}{sub J}2{lambda}{sub L}/d/y{sup 2}; i.e., it diverges as T{yields}T{sub c}. For l>>{Lambda}, both the core and the tail have nearly the same characteristic length l{Lambda}.

Kogan, V. G.; Dobrovitski, V. V.; Clem, J. R.; Mawatari, Yasunori; Mints, R. G.

2001-04-01T23:59:59.000Z

312

Single P-N junction tandem photovoltaic device  

DOE Patents [OSTI]

A single P-N junction solar cell is provided having two depletion regions for charge separation while allowing the electrons and holes to recombine such that the voltages associated with both depletion regions of the solar cell will add together. The single p-n junction solar cell includes an alloy of either InGaN or InAlN formed on one side of the P-N junction with Si formed on the other side in order to produce characteristics of a two junction (2J) tandem solar cell through only a single P-N junction. A single P-N junction solar cell having tandem solar cell characteristics will achieve power conversion efficiencies exceeding 30%.

Walukiewicz, Wladyslaw (Kensington, CA); Ager, III, Joel W. (Berkeley, CA); Yu, Kin Man (Lafayette, CA)

2011-10-18T23:59:59.000Z

313

Single P-N junction tandem photovoltaic device  

DOE Patents [OSTI]

A single P-N junction solar cell is provided having two depletion regions for charge separation while allowing the electrons and holes to recombine such that the voltages associated with both depletion regions of the solar cell will add together. The single p-n junction solar cell includes an alloy of either InGaN or InAlN formed on one side of the P-N junction with Si formed on the other side in order to produce characteristics of a two junction (2J) tandem solar cell through only a single P-N junction. A single P-N junction solar cell having tandem solar cell characteristics will achieve power conversion efficiencies exceeding 30%.

Walukiewicz, Wladyslaw (Kensington, CA); Ager, III, Joel W. (Berkeley, CA); Yu, Kin Man (Lafayette, CA)

2012-03-06T23:59:59.000Z

314

Fabrication of magnetic tunnel junctions with epitaxial and textured ferromagnetic layers  

DOE Patents [OSTI]

This invention relates to magnetic tunnel junctions and methods for making the magnetic tunnel junctions. The magnetic tunnel junctions include a tunnel barrier oxide layer sandwiched between two ferromagnetic layers both of which are epitaxial or textured with respect to the underlying substrate upon which the magnetic tunnel junctions are grown. The magnetic tunnel junctions provide improved magnetic properties, sharper interfaces and few defects.

Chang, Y. Austin (Middleton, WI); Yang, Jianhua Joshua (Madison, WI)

2008-11-11T23:59:59.000Z

315

Pseudospherical Junctions or Josephson Effect, Backlund Transformations, and Fine Structure Coupling  

E-Print Network [OSTI]

, that the geometric phase evolution within M circularly and toroidally arranged virtual Josephson junctions (coupled by a special arrangement of Josephson junctions. In this con- text "virtual junction" means simply a scalar impedance will represent in this paper a "virtual Josephson junction". The Josephson junctions

Binder, Bernd

316

Classical phase diffusion in small hysteretic Josephson junctions  

SciTech Connect (OSTI)

The existence of classical phase diffusion in hysteretic junctions is demonstrated by quantitative agreement between experimental and simulated {ital I}-{ital V} curves. The simulations are based on a circuit that accurately models both the junction and its external shunting impedance at microwave frequencies. We show that the bias current at which the junction switches from the phase diffusion state to the voltage state is sensitive to dissipation at microwave frequencies.

Martinis, J.M.; Kautz, R.L. (National Institute of Standards and Technology, Boulder, Colorado 80303 (US))

1989-10-02T23:59:59.000Z

317

Organic-Inorganic Hetero Junction White Light Emitting Diode.  

E-Print Network [OSTI]

?? The purpose of this thesis work is to design and fabricates organic-inorganic hetero junction White Light Emitting Diode (WLED). In this WLED, inorganic material… (more)

Lubuna Beegum, Shafeek

2008-01-01T23:59:59.000Z

318

Quantum manipulation and simulation using Josephson junction arrays  

E-Print Network [OSTI]

We discuss the prospect of using quantum properties of large scale Josephson junction arrays for quantum manipulation and simulation. We study the collective vibrational quantum modes of a Josephson junction array and show that they provide a natural and practical method for realizing a high quality cavity for superconducting qubit based QED. We further demonstrate that by using Josephson junction arrays we can simulate a family of problems concerning spinless electron-phonon and electron-electron interactions. These protocols require no or few controls over the Josephson junction array and are thus relatively easy to realize given currently available technology.

Xingxiang Zhou; Ari Mizel

2006-05-01T23:59:59.000Z

319

A Josephson Junction Microscope for Low-frequency Fluctuators  

E-Print Network [OSTI]

The high-Q harmonic oscillator mode of a Josephson junction can be used as a novel probe of spurious two-level systems (TLSs) inside the amorphous oxide tunnel barriers of the junction. In particular, we show that spectroscopic transmission measurements of the junction resonator mode can reveal how the coupling magnitude between the junction and the TLSs varies with an external magnetic field applied in the plane of the tunnel barrier. The proposed experiments offer the possibility of clearly resolving the underlying coupling mechanism for these spurious TLSs, an important decoherence source limiting the quality of superconducting quantum devices.

L. Tian; R. W. Simmonds

2007-05-10T23:59:59.000Z

320

Phase Modulator Programming to Get Flat Pulses with Desired Length and Power from the CTF3 Pulse Compressors  

E-Print Network [OSTI]

The pulse compressor is located after the klystron to increase the power peak by storing the energy at the beginning and releasing it near the end of klystron output pulse. In the CTF3 pulse compressors a doubling of the peak power is achieved according to our needs and the machine parameters. The magnitude of peak power, pulse length and flatness can be controlled by using a phase modulator for the input signal of klystrons. A C++ code is written to simulate the pulse compressor behaviour according to the klystron output pulse power. By manually changing the related parameters in the code for the best match, the quality factor and the filling time of pulse compressor cavities can be determined. This code also calculates and sends the suitable phase to the phase modulator according to the klystron output pulse power and the desired pulse length and peak power

Shaker, Seyd Hamed; Skowronski, Piotr; Syratchev, Igor; Tecker, Frank

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

A New Approach for Determining Optimal Air Compressor Location in A Manufacturing Facility to Increase Energy Efficiency  

E-Print Network [OSTI]

the energy cost -in the manufacturing facility. Compressor distance to air demand, air pressure, load factor and volume are all factors considered in the model. The proposed model determines the facility's attributes based on user inputs of facility size...

Zahlan, J.; Avci, M.; Asfour, S.

2014-01-01T23:59:59.000Z

322

Non-relativistic Josephson Junction from Holography  

E-Print Network [OSTI]

We construct a Josephson junction in non-relativistic case with a Lifshitz geometry as the dual gravity. We investigate the effect of the Lifshitz scaling in comparison with its relativistic counterpart. The standard sinusoidal relation between the current and the phase difference is found for various Lifshitz scalings characterised by the dynamical critical exponent. We also find the exponential decreasing relation between the condensate of the scalar operator within the barrier at zero current and the width of the weak link, as well as the relation between the critical current and the width. Nevertheless, the coherence lengths obtained from two exponential decreasing relations generically have discrepancies for non-relativistic dual.

Li, Huai-Fan; Wang, Yong-Qiang; Zhang, Hai-Qing

2014-01-01T23:59:59.000Z

323

Quantum dynamics in the bosonic Josephson junction  

E-Print Network [OSTI]

We employ a semiclassical picture to study dynamics in a bosonic Josephson junction with various initial conditions. Phase-diffusion of coherent preparations in the Josephson regime is shown to depend on the initial relative phase between the two condensates. For initially incoherent condensates, we find a universal value for the buildup of coherence in the Josephson regime. In addition, we contrast two seemingly similar on-separatrix coherent preparations, finding striking differences in their convergence to classicality as the number of particles increases.

Maya Chuchem; Katrina Smith-Mannschott; Moritz Hiller; Tsampikos Kottos; Amichay Vardi; Doron Cohen

2010-10-21T23:59:59.000Z

324

Non-relativistic Josephson Junction from Holography  

E-Print Network [OSTI]

We construct a Josephson junction in non-relativistic case with a Lifshitz geometry as the dual gravity. We investigate the effect of the Lifshitz scaling in comparison with its relativistic counterpart. The standard sinusoidal relation between the current and the phase difference is found for various Lifshitz scalings characterised by the dynamical critical exponent. We also find the exponential decreasing relation between the condensate of the scalar operator within the barrier at zero current and the width of the weak link, as well as the relation between the critical current and the width. Nevertheless, the coherence lengths obtained from two exponential decreasing relations generically have discrepancies for non-relativistic dual.

Huai-Fan Li; Li Li; Yong-Qiang Wang; Hai-Qing Zhang

2014-12-09T23:59:59.000Z

325

Japanese and American competition in the development of scroll compressors and its impact on the American air conditioning industry  

SciTech Connect (OSTI)

This report examines the technological development of scroll compressors and its impact on the air conditioning equipment industry. Scroll compressors, although considered to be the compressors of the future for energy-efficient residential heat pumps and possibly for many other applications, are difficult to manufacture on a volume-production base. The manufacturing process requires computer-aided, numerically controlled tools for high-precision fabrication of major parts. Japan implemented a global strategy for dominating the technological world market in the 1970s, and scroll compressor technology benefited from the advent of new-generation machine tools. As a result, if American manufacturers of scroll compressors purchase or are essentially forced to purchase numerically controlled tools from Japan in the future, they will then become dependent on their own competitors because the same Japanese conglomerates that make numerically controlled tools also make scroll compressors. This study illustrates the importance of the basic machine tool industry to the health of the US economy. Without a strong machine tool industry, it is difficult for American manufacturers to put innovations, whether patented or not, into production. As we experience transformation in the air conditioning and refrigeration market, it will be critical to establish a consistent national policy to provide healthy competition among producers, to promote innovation within the industry, to enhance assimilation of new technology, and to eliminate practices that are incompatible with these goals. 72 refs., 8 figs., 1 tab.

Ushimaru, Kenji (Energy International, Inc., Bellevue, WA (USA))

1990-02-01T23:59:59.000Z

326

Quantum breathers in capacitively coupled Josephson junctions: Correlations, number conservation, and entanglement  

E-Print Network [OSTI]

Quantum breathers in capacitively coupled Josephson junctions: Correlations, number conservation coupled Josephson junctions. In the classical case the equations of motion admit discrete breather by employing the already developed tech- niques for quantum information processing using Josephson junctions

Flach, Sergej

327

Temperature and humidity control during cooling and dehumidifying by compressor and evaporator fan speed variation  

SciTech Connect (OSTI)

The accurate control of temperature and relative humidity during cooling and dehumidifying air-conditioning processes may be achieved by compressor and evaporator fan speed variation. Proportional-integral-differential (PID) control methods are shown to be suitable for attaining compressor and evaporator fan speeds such that the sensible and latent components of the refrigeration system capacity equal the sensible and latent components of the system load. The feasibility of the control method has been verified experimentally. A numerical model of an environmental control system, including refrigeration, space, and PID control subsystems, has been developed. The model is suitable for determining system response to variations of PID coefficient values and to variations of system loads.

Krakow, K.I.; Lin, S.; Zeng, Z.S. [Concordia Univ., Montreal, Quebec (Canada). Dept. of Mechanical Engineering

1995-08-01T23:59:59.000Z

328

Thrust Area 2 Free-Piston Compressor for Portable Fluid-Powered Systems  

E-Print Network [OSTI]

Diluted combustion products from previous stroke Combustion gases expand down to Air in compressor chamber, combustion products continue to dilute with entrained fresh air further cooling 5. End of Stroke.- Magnetic kinetic energy. products cooled with fresh air. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 50 100 150 200 250 300 350

Barth, Eric J.

329

Compressor Calorimeter Test of R-410A Alternatives R-32, DR-5, and L-41a  

SciTech Connect (OSTI)

As a contribution to the AHRI Low-GWP Alternative Refrigerants Evaluation Program (AREP), this study compares performance of alternative refrigerants R32, DR-5, and L-41A to that of refrigerant R-410A (baseline) in a scroll compressor designed for air-conditioning and heat pump applications. Compressor calorimeter tests were performed to evaluate the performance of the lower-GWP alternative refrigerants in place of the common refrigerant R-410A in a 36,000 Btu/hr compressor calorimeter using a compressor having a nominal rated capacity of 21,300 Btu/hr. Tests were conducted over a suction dew point temperature range of 10 F to 55 F in 5 F increments and a discharge dew point temperature range of 70 F to 140 F in 10 F increments. All the tests were performed with 20 F superheat, 40 F superheat and 65 F suction temperature. A liquid subcooling level of 15 F was maintained for all the test conditions. The tests showed that performance of these three lower-GWP alternative refrigerants is comparable to that of R-410A. For the 20 F superheat and 15 F subcooling test conditions, EERs of R32, DR-5, and L-41A were 90% to 99%, 96% to 99%, and 94% to 101%, respectively, compared to that of R-410A. Similarly, cooling capacities of R32, DR-5, and L-41A were 98% to 103%, 92% to 96%, and 84% to 92%, respectively, compared to that of R-410A.

Shrestha, Som S [ORNL; Mahderekal, Isaac [ORNL; Sharma, Vishaldeep [ORNL; Abdelaziz, Omar [ORNL

2013-02-01T23:59:59.000Z

330

A modified post damping ring bunch compressor beamline for the TESLA linear collider  

SciTech Connect (OSTI)

We propose a modified bunch compressor beamline, downstream of the damping ring, for the TESLA linear collider. This modified beamline uses a third harmonic radio-frequency section based on the 3.9 GHz superconducting cavity under development at Fermilab. In our design the beam deceleration is about {approx}50 MeV instead of {approx}450 MeV in the original design proposed.

Philippe R.-G. Piot; Winfried Decking

2004-03-23T23:59:59.000Z

331

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

e.g. co-locate with gasoline station, bus-yard, or officeintegrated into existing gasoline stations with 8 dispensersof a liquid H 2 and gasoline station layout. Figure 4-9:

Weinert, Jonathan X.; Lipman, Timothy

2006-01-01T23:59:59.000Z

332

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

located at an existing gasoline station. One could use othere.g. co-locate with gasoline station, bus-yard, or officeequivalent to about 6% of gasoline stations in California 4.

Lipman, T E; Weinert, Jonathan X.

2006-01-01T23:59:59.000Z

333

Mobile Alternative Fueling Station Locator  

SciTech Connect (OSTI)

The Department of Energy's Alternative Fueling Station Locator is available on-the-go via cell phones, BlackBerrys, or other personal handheld devices. The mobile locator allows users to find the five closest biodiesel, electricity, E85, hydrogen, natural gas, and propane fueling sites using Google technology.

Not Available

2009-04-01T23:59:59.000Z

334

NOAA PMEL Station Chemistry Data  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Submicron and supermicron samples are analyzed by ion chromatography for Cl-, NO3-, SO4-2, Na+, NH4+, K+, Mg2+, and Ca+2. The analysis of MSA-, Br-, and oxalate has been added to some stations. Samples also are analyzed for total mass by gravimetric analysis at 55 +/- 5% RH.

Quinn, Patricia

335

Presented by Climate End Station  

E-Print Network [OSTI]

.S. Department of Energy Bettge_LCF Climate_SC10 CESM working groups · Application ­ Climate change, paleoclimate climate change projections for IPCC AR5 Gerald Meehl and Warren Washington, NCAR · Climate changePresented by Climate End Station Thomas Bettge National Center for Atmospheric Research James B

336

Conditions for synchronization in Josephson-junction arrays  

SciTech Connect (OSTI)

An effective perturbation theoretical method has been developed to study the dynamics of Josephson-junction series arrays. It is shown that the inclusion of junction capacitances, which is often ignored, has a significant impact on synchronization. Comparison of analytic with computational results over a wide range of parameters shows excellent agreement.

Chernikov, A.A.; Schmidt, G. [Stevens Institute of Technology, Hoboken, New Jersey 07030 (United States)] [Stevens Institute of Technology, Hoboken, New Jersey 07030 (United States)

1995-10-01T23:59:59.000Z

337

A fourier spectrometer for studying the radiation from Josephson Junctions  

SciTech Connect (OSTI)

The paper describes a Fourier spectrometer designed to study the radiation generated by a Josephson junction in the millimeter and FIR bands with a resolution of {approx}2 GHz in the two-pass mode and {approx}1 GHz in the multipass mode. A feature is that one Josephson junctions operates as both generator and detector at the same time.

Verevkin, A.A.; Il`in, V.A.; Lipatov, A.P. [V.I. Lenin Moscow Pedagogical State Univ., Moscow (Russian Federation)

1995-06-01T23:59:59.000Z

338

Conditions for synchronization in Josephson-junction arrays  

SciTech Connect (OSTI)

An effective perturbation theoretical method has been developed to study the dynamics of Josephson Junction series arrays. It is shown that the inclusion of Junction capacitances, often ignored, has a significant impact on synchronization. Comparison of analytic with computational results over a wide range of parameters shows excellent agreement.

Chernikov, A.A.; Schmidt, G. [Stevens Institute of Technology, Hoboken, NJ (United States)

1995-12-31T23:59:59.000Z

339

Josephson junctions in high-T/sub c/ superconductors  

DOE Patents [OSTI]

The invention includes a high T/sub c/ Josephson sperconducting junction as well as the method and apparatus which provides the junction by application of a closely controlled and monitored electrical discharge to a microbridge region connecting two portions of a superconducting film.

Falco, C.M.; Lee, T.W.

1981-01-14T23:59:59.000Z

340

Intermittency and low frequency noise in a Josephson junction  

SciTech Connect (OSTI)

The bifurcation, chaos, and intermittency in the {ital f}-biased Josephson junction are investigated by numerically integrating the equation of the Stewart-McCumber model with an interference {epsilon} cos {phi}'' term. In addition, the relationship between the low frequency noise and the routes to chaos in a Josephson junction is discussed.

Xiao Wanru (Physics Division, Nanjing Architectural Institute (CN)); Yao Xixian (Department of Physics, Nanjing University (CN))

1990-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

E-Print Network 3.0 - adhering junctions connecting Sample Search...  

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

S... . P. Benz, and J. E. Bonevich Abstract--The authors have made tall, uniform stacked Josephson junction... bar- rier of our niobium Josephson junctions and obtain working...

342

Vortex radiation in long narrow Josephson junctions: Theory and experiment  

SciTech Connect (OSTI)

We study theoretically and experimentally the dynamics of vortices in long, extremely narrow Josephson junctions. Using a variational approach, the current-voltage characteristics are calculated for junctions of different widths. The analytically and numerically calculated current-voltage characteristics show good agreement. We find that the decrease of the junction width leads to a substantial increase of the maximum velocity of vortices. Due to the interaction with stray magnetic fields outside the junction, the vortices radiate Cherenkov waves as they move in the junction. Locking of the vortex oscillation frequency to that of the Cherenkov radiation leads to novel resonances on the current-voltage characteristics. We observe such resonances in experiments, and their voltage positions and current magnitudes are in qualitative agreement with our theoretical analysis.

Abdumalikov, A.A. Jr.; Ustinov, A.V. [Physikalisches Institut III, Universitaet Erlangen-Nuernberg, D-91058 Erlangen (Germany); Fistul, M.V. [Theoretische Physik III, Ruhr-Universitaet Bochum, D-44801 Bochum (Germany)

2005-10-01T23:59:59.000Z

343

Proposal to negotiate two contracts, without competitive tendering, for the supply and the repair of compressors for the LHC 18 kW helium refrigeration plants  

E-Print Network [OSTI]

Proposal to negotiate two contracts, without competitive tendering, for the supply and the repair of compressors for the LHC 18 kW helium refrigeration plants

2011-01-01T23:59:59.000Z

344

Proposal to negotiate a contract, without competitive tendering, for the overhaul of screw compressors for the LHC 18 kW helium refrigeration plants  

E-Print Network [OSTI]

Proposal to negotiate a contract, without competitive tendering, for the overhaul of screw compressors for the LHC 18 kW helium refrigeration plants

2012-01-01T23:59:59.000Z

345

COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY  

E-Print Network [OSTI]

CALIFORNIA ENERGY COMMISSION COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY GENERATION .............................................................................13 Definition of Levelized Cost ........................................................................................................13 Levelized Cost Components

346

COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY  

E-Print Network [OSTI]

CALIFORNIA ENERGY COMMISSION COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY GENERATION............................................................ 3 Definition of Levelized Cost.................................................................................... 3 Levelized Cost Categories

Laughlin, Robert B.

347

7.1.1. Fernbahnhof / Rail Station  

E-Print Network [OSTI]

Fernbahnhofs 7.1.1.4.5 Kälteversorgung des Fernbahnhofs / Cooling Supply of Rail Station 7 Abwasserversorgung des Fernbahnhofs / Fresh and Used Water Supply of Rail Stations 7.1.1.4.1.1 Verfahren zur Fernbahnhofs 7.1.1.4.2 Stromversorgung des Fernbahnhofs / Power Supply of Rail Station 7

Berlin,Technische Universität

348

The Fuel-Travel-Back Approach to Hydrogen Station Siting  

E-Print Network [OSTI]

the experience of gasoline stations. Driven by the notion "percentages of existing gasoline stations, for a successfulsubset of the existing gasoline station network [14]. These

Lin, Zhenhong; Ogden, Joan; Fan, Yueyue; Chen, Chien-Wei

2009-01-01T23:59:59.000Z

349

Quantum Fluctuations in Josephson Junction Comparators  

E-Print Network [OSTI]

We have developed a method for calculation of quantum fluctuation effects, in particular of the uncertainty zone developing at the potential curvature sign inversion, for a damped harmonic oscillator with arbitrary time dependence of frequency and for arbitrary temperature, within the Caldeira-Leggett model. The method has been applied to the calculation of the gray zone width Delta Ix of Josephson-junction balanced comparators driven by a specially designed low-impedance RSFQ circuit. The calculated temperature dependence of Delta Ix in the range 1.5 to 4.2K is in a virtually perfect agreement with experimental data for Nb-trilayer comparators with critical current densities of 1.0 and 5.5 kA/cm^2, without any fitting parameters.

Thomas J. Walls; Timur V. Filippov; Konstantin K. Likharev

2002-07-15T23:59:59.000Z

350

Quantum Computing with Atomic Josephson Junction Arrays  

E-Print Network [OSTI]

We present a quantum computing scheme with atomic Josephson junction arrays. The system consists of a small number of atoms with three internal states and trapped in a far-off resonant optical lattice. Raman lasers provide the "Josephson" tunneling, and the collision interaction between atoms represent the "capacitive" couplings between the modes. The qubit states are collective states of the atoms with opposite persistent currents. This system is closely analogous to the superconducting flux qubit. Single qubit quantum logic gates are performed by modulating the Raman couplings, while two-qubit gates result from a tunnel coupling between neighboring wells. Readout is achieved by tuning the Raman coupling adiabatically between the Josephson regime to the Rabi regime, followed by a detection of atoms in internal electronic states. Decoherence mechanisms are studied in detail promising a high ratio between the decoherence time and the gate operation time.

Lin Tian; P. Zoller

2003-06-12T23:59:59.000Z

351

The World as a Dual Josephson Junction  

E-Print Network [OSTI]

We examine some of the implications of the field-theoretical mechanism for the localization of gauge fields on hypersurfaces in higher-dimensional bulk space-time. This mechanism exploits the analogy between confinement and dual superconductivity. In the simplest case of a photon localized on a (2+1)-dimensional surface in a (3+1)-dimensional bulk, we argue that the system behaves like a dual Josephson junction. This implies that the effective gauge theory on the surface is not free, but displays weak confinement with a linear potential. We comment on the relevance of our results for the realistic case of a (3+1)-dimensional surface in a space-time with one or more extra dimensions.

N. Tetradis

2000-02-24T23:59:59.000Z

352

Gauge Theories of Josephson Junction Arrays  

E-Print Network [OSTI]

We show that the zero-temperature physics of planar Josephson junction arrays in the self-dual approximation is governed by an Abelian gauge theory with periodic mixed Chern-Simons term describing the charge-vortex coupling. The periodicity requires the existence of (Euclidean) topological excitations which determine the quantum phase structure of the model. The electric-magnetic duality leads to a quantum phase transition between a superconductor and a superinsulator at the self-dual point. We also discuss in this framework the recently proposed quantum Hall phases for charges and vortices in presence of external offset charges and magnetic fluxes: we show how the periodicity of the charge-vortex coupling can lead to transitions to anyon superconductivity phases. We finally generalize our results to three dimensions, where the relevant gauge theory is the so-called BF system, with an antisymmetric Kalb-Ramond gauge field.

M. C. Diamantini; P. Sodano; C. A. Trugenberger

1995-11-23T23:59:59.000Z

353

Quantum computing with atomic Josephson junction arrays  

SciTech Connect (OSTI)

We present a quantum computing scheme with atomic Josephson junction arrays. The system consists of a small number of atoms with three internal states and trapped in a far-off-resonant optical lattice. Raman lasers provide the 'Josephson' tunneling, and the collision interaction between atoms represent the 'capacitive' couplings between the modes. The qubit states are collective states of the atoms with opposite persistent currents. This system is closely analogous to the superconducting flux qubit. Single-qubit quantum logic gates are performed by modulating the Raman couplings, while two-qubit gates result from a tunnel coupling between neighboring wells. Readout is achieved by tuning the Raman coupling adiabatically between the Josephson regime to the Rabi regime, followed by a detection of atoms in internal electronic states. Decoherence mechanisms are studied in detail promising a high ratio between the decoherence time and the gate operation time.

Tian Lin; Zoller, P. [Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck (Austria)

2003-10-01T23:59:59.000Z

354

Advanced Concepts in Josephson Junction Reflection Amplifiers  

E-Print Network [OSTI]

Low-noise amplification atmicrowave frequencies has become increasingly important for the research related to superconducting qubits and nanoelectromechanical systems. The fundamental limit of added noise by a phase-preserving amplifier is the standard quantum limit, often expressed as noise temperature $T_{q} = \\hbar {\\omega}/2k_{B}$. Towards the goal of the quantum limit, we have developed an amplifier based on intrinsic negative resistance of a selectively damped Josephson junction. Here we present measurement results on previously proposed wide-band microwave amplification and discuss the challenges for improvements on the existing designs. We have also studied flux-pumped metamaterial-based parametric amplifiers, whose operating frequency can be widely tuned by external DC-flux, and demonstrate operation at $2\\omega$ pumping, in contrast to the typical metamaterial amplifiers pumped via signal lines at $\\omega$.

Pasi Lähteenmäki; Visa Vesterinen; Juha Hassel; G. S. Paraoanu; Heikki Seppä; Pertti Hakonen

2014-05-20T23:59:59.000Z

355

Josephson-junction arrays with long-range interactions  

SciTech Connect (OSTI)

We calculate the current-voltage (IV) characteristics of a Josephson-junction array with long-range interactions. The array consists of two sets of equally spaced parallel superconducting wires placed at right angles. A Josephson junction is formed at every point wherever the wires cross. We treat each such junction as an overdamped resistively shunted junction, and each wire segment between two junctions as a similar resistively shunted junction with a much higher critical current. The IV characteristics are obtained by solving the coupled Josephson equations numerically. We find that, for a sufficiently large number of wires, the critical current saturates at a finite value because of the wire inductance, in excellent agreement with experiment. The calculated IV characteristics also show a striking hysteresis, even though each of the individual junctions is {ital nonhysteretic}. The hysteresis results from a global redistribution of current flow on the upper and lower voltage branches, and is also in excellent agreement with experiment. {copyright} {ital 1997} {ital The American Physical Society}

Harbaugh, J.K.; Stroud, D. [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)] [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)

1997-10-01T23:59:59.000Z

356

Mechanical deformations of boron nitride nanotubes in crossed junctions  

SciTech Connect (OSTI)

We present a study of the mechanical deformations of boron nitride nanotubes (BNNTs) in crossed junctions. The structure and deformation of the crossed tubes in the junction are characterized by using atomic force microscopy. Our results show that the total tube heights are reduced by 20%–33% at the crossed junctions formed by double-walled BNNTs with outer diameters in the range of 2.21–4.67?nm. The measured tube height reduction is found to be in a nearly linear relationship with the summation of the outer diameters of the two tubes forming the junction. The contact force between the two tubes in the junction is estimated based on contact mechanics theories and found to be within the range of 4.2–7.6 nN. The Young's modulus of BNNTs and their binding strengths with the substrate are quantified, based on the deformation profile of the upper tube in the junction, and are found to be 1.07?±?0.11 TPa and 0.18–0.29 nJ/m, respectively. Finally, we perform finite element simulations on the mechanical deformations of the crossed BNNT junctions. The numerical simulation results are consistent with both the experimental measurements and the analytical analysis. The results reported in this paper contribute to a better understanding of the structural and mechanical properties of BNNTs and to the pursuit of their applications.

Zhao, Yadong; Chen, Xiaoming; Ke, Changhong, E-mail: cke@binghamton.edu [Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, New York 13902 (United States); Park, Cheol [NASA Langley Research Center, Hampton, Virginia 23681 (United States); Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States); Fay, Catharine C. [NASA Langley Research Center, Hampton, Virginia 23681 (United States); Stupkiewicz, Stanislaw [Institute of Fundamental Technological Research, Warsaw (Poland)

2014-04-28T23:59:59.000Z

357

The radio-frequency impedance of individual intrinsic Josephson junctions  

SciTech Connect (OSTI)

We have measured the response of an array of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} intrinsic Josephson junctions to irradiation at 3 GHz. By measuring the dependence of the switching current upon the radio-frequency current for five of the junctions in the array we show quantitatively that the junctions have identical impedances at 3 GHz, this impedance being given by the inverse of the slope of the current-voltage characteristics.

Leiner, Johannes; Saleem, Sajid; Fenton, J. C.; Warburton, P. A. [London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH (United Kingdom); Yamamoto, Takashi; Kadowaki, Kazuo [Institute of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)

2009-12-21T23:59:59.000Z

358

Dissipative dynamics of a Josephson junction in the Bose gases  

SciTech Connect (OSTI)

The dissipative dynamics of a Josephson junction in Bose gases is considered within the framework of the model of a tunneling Hamiltonian. The effective action that describes the dynamics of the phase difference across the junction is derived using the functional integration method. The dynamic equation obtained for the phase difference across the junction is analyzed for the finite temperatures in the low-frequency limit involving the radiation terms. The asymmetric case of the Bose gases with the different order parameters is calculated as well.

Barankov, R.A. [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Burmistrov, S.N. [RRC 'Kurchatov Institute', Kurchatov Sq.1, 123182 Moscow (Russian Federation)

2003-01-01T23:59:59.000Z

359

Supercurrent-Induced Temperature Gradient across a Nonequilibrium SNS Josephson Junction M. S. Crosser,1  

E-Print Network [OSTI]

Supercurrent-Induced Temperature Gradient across a Nonequilibrium SNS Josephson Junction M. S direction. The feature represents an effective temperature gradient across the SNS Josephson junction Josephson junction (SNS JJ) into a `` junction'' by driving the electron energy distribution far from

Birge, Norman

360

Asymmetric noise probed with a Josephson junction Q. Le Masne,1  

E-Print Network [OSTI]

Asymmetric noise probed with a Josephson junction Q. Le Masne,1 H. Pothier,1, Norman O. Birge,2 C are measured using a Josephson junction. The current noise adds to the bias current of the Josephson junction], consists in using a Josephson junction (JJ) as a large bandwidth on-chip noise detector [7, 8, 9]. It has

Boyer, Edmond

Note: This page contains sample records for the topic "junction compressor station" 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

Cooper pair transport and Coulomb blockade in one dimensional Josephson junction arrays  

E-Print Network [OSTI]

Cooper pair transport and Coulomb blockade in one dimensional Josephson junction arrays Peter Å¡Ë?ogskoletryckeriet, Stockholm, 2000 #12; Abstract One dimensional Josephson junction arrays have been fabricated, measured small capacitance Josephson junction is described using a Serial Resistive and Inductive Junction (SRLJ

Haviland, David

362

Asymmetric Noise Probed with a Josephson Junction Q. Le Masne,1  

E-Print Network [OSTI]

Asymmetric Noise Probed with a Josephson Junction Q. Le Masne,1 H. Pothier,1,* Norman O. Birge,2 C of the current through a tunnel junction are measured using a Josephson junction. The current noise adds to the bias current of the Josephson junction and affects its switching out of the supercurrent branch

Birge, Norman

363

Superconducting and Insulating Behavior in One-Dimensional Josephson Junction Arrays  

E-Print Network [OSTI]

Superconducting and Insulating Behavior in One-Dimensional Josephson Junction Arrays David B Stockholm, Sweden Experiments on one-dimensional small capacitance Josephson Junction ar- rays are described shunted junction model of classical Josephson junctions. PACS numbers: 73.40Gk, 74.50+r 1. INTRODUCTION

Haviland, David

364

Long Josephson junction in a resonant cavity I. Tornes* and D. Stroud  

E-Print Network [OSTI]

Long Josephson junction in a resonant cavity I. Tornes* and D. Stroud Department of Physics Josephson junctions. When a soliton is present in the junction corresponding to a quantum of magnetic flux s : 74.81.Fa, 74.72. h, 74.25.Nf I. INTRODUCTION Josephson junction arrays have now been studied for more

Stroud, David

365

Microwave Photon Counter Based on Josephson Junctions Y.-F. Chen,1,* D. Hover,1  

E-Print Network [OSTI]

Microwave Photon Counter Based on Josephson Junctions Y.-F. Chen,1,* D. Hover,1 S. Sendelbach,1 L on the current-biased Josephson junction. The junction is tuned to absorb single microwave photons from optical photon counters, it is natural to consider the Josephson junction--a nonlinear, nondissipative

Saffman, Mark

366

Timber Mountain Precipitation Monitoring Station  

SciTech Connect (OSTI)

A precipitation monitoring station was placed on the west flank of Timber Mountain during the year 2010. It is located in an isolated highland area near the western border of the Nevada National Security Site (NNSS), south of Pahute Mesa. The cost of the equipment, permitting, and installation was provided by the Environmental Monitoring Systems Initiative (EMSI) project. Data collection, analysis, and maintenance of the station during fiscal year 2011 was funded by the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office Environmental Restoration, Soils Activity. The station is located near the western headwaters of Forty Mile Wash on the Nevada Test and Training Range (NTTR). Overland flows from precipitation events that occur in the Timber Mountain high elevation area cross several of the contaminated Soils project CAU (Corrective Action Unit) sites located in the Forty Mile Wash watershed. Rain-on-snow events in the early winter and spring around Timber Mountain have contributed to several significant flow events in Forty Mile Wash. The data from the new precipitation gauge at Timber Mountain will provide important information for determining runoff response to precipitation events in this area of the NNSS. Timber Mountain is also a groundwater recharge area, and estimation of recharge from precipitation was important for the EMSI project in determining groundwater flowpaths and designing effective groundwater monitoring for Yucca Mountain. Recharge estimation additionally provides benefit to the Underground Test Area Sub-project analysis of groundwater flow direction and velocity from nuclear test areas on Pahute Mesa. Additionally, this site provides data that has been used during wild fire events and provided a singular monitoring location of the extreme precipitation events during December 2010 (see data section for more details). This letter report provides a summary of the site location, equipment, and data collected in fiscal year 2011.

Lyles Brad,McCurdy Greg,Chapman Jenny,Miller Julianne

2012-01-01T23:59:59.000Z

367

Beam dynamics performances and applications of a low-energy electron-beam magnetic bunch compressor  

E-Print Network [OSTI]

Many front-end applications of electron linear accelerators rely on the production of temporally-compressed bunches. The shortening of electron bunches is often realized with magnetic bunch compressors located in high-energy sections of accelerators. Magnetic compression is subject to collective effects including space charge and self interaction via coherent synchrotron radiation. In this paper we explore the application of magnetic compression to low-energy ($\\sim 40$ MeV), high-charge (nC) electron bunches with low normalized transverse emittances ($< 5$ $\\mu$m).

Prokop, C R; Carlsten, B E; Church, M

2013-01-01T23:59:59.000Z

368

RF study and simulations of a C-band Barrel Open Cavity (BOC) pulse compressor  

E-Print Network [OSTI]

This paper focuses on the RF study of a C-band(5712MHz) BOC pulse compressor. The operating principle of BOC is presented and the technical specifications are determined. The main components of BOC such as the cavity, the matching waveguide, the coupling slots and the tuning rings were numerically simulated by 3-D codes software HFSS and CST Microwave Studio(MWS). The "whispering gallery" mode TM6,1,1 with an unload Q of 100000 was chosen to oscillate in the cavity. An energy multiplication factor of 1.99 and a peak power gain of 6.34 were achieved theoretically.

Shu, Guan; He, Xiang

2014-01-01T23:59:59.000Z

369

Internally-cooled centrifugal compressor with cooling jacket formed in the diaphragm  

DOE Patents [OSTI]

An internally-cooled centrifugal compressor having a shaped casing and a diaphragm disposed within the shaped casing having a gas side and a coolant side so that heat from a gas flowing though the gas side is extracted via the coolant side. An impeller disposed within the diaphragm has a stage inlet on one side and a stage outlet for delivering a pressurized gas to a downstream connection. The coolant side of the diaphragm includes at least one passageway for directing a coolant in a substantially counter-flow direction from the flow of gas through the gas side.

Moore, James J.; Lerche, Andrew H.; Moreland, Brian S.

2014-08-26T23:59:59.000Z

370

Hanford Meteorological Station - Hanford Site  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation Desert Southwest Region service area. TheEPSCIResearchGulf of MexicoDidYouKnowForStation

371

Development of a high efficiency compressor/expander for an air cycle air conditioning system. Final report  

SciTech Connect (OSTI)

This document presents the methods and procedures used and the results obtained in the design, fabrication, and testing of a rotary vane type compressor operated on air cycle thermodynamics. The history and results of the testing of a similar expander are summarized and the full report of that work is referenced. The machine design used was based on one patented by Ecton Corporation. The goal of the reported effort was to demonstrate the attainable efficiencies of these machines. Appropriate test rigs were assembled and the machines were tested at various operating conditions. The compressor testing did not achieve the full design speed because of time constraints but important data was obtained at 87% speed (3000 rpm). The maximum measured total efficiencies were 78% for the expander and 71% for the compressor. Various design improvements which may yield improved performance were identified and reported.

Summers, R.L.; Smolinski, R.E.

1982-11-15T23:59:59.000Z

372

Power dissipation in a single molecule junction: Tracking energy levels  

E-Print Network [OSTI]

Motivated by recent work [Lee et al. Nature {\\bf 489}, 209 (2013)], on asymmetry features of heat dissipation in the electrodes of molecular junctions, we put forward an idea as a result of heat dissipation in the electrodes. Based on tight-binding model and a generalized Green's function formalism, we describe the conditions under which heat dissipation shows symmetry characteristic and does not depend on the bias polarity. We also show the power dissipated in the junction can be used to detect which energy levels of molecule junction play more or less role in the transmission process. We present this idea by studying a simple toy model and Au-$C_{60}$-Au junction.

Yaghoob Naimi; Javad Vahedi

2014-12-05T23:59:59.000Z

373

Cambridge Grand Junction transit implementation : alternatives, scheduling, cost, and performance  

E-Print Network [OSTI]

The Grand Junction railroad lies at the heart of East Cambridge adjacent to the Kendall Square business district and the Massachusetts Institute of Technology campus. Over the last one hundred years the railroad has gone ...

Iglesias Cuervo, Jesus

2012-01-01T23:59:59.000Z

374

EA-1037: Uranium Lease Management Program, Grand Junction, Colorado  

Broader source: Energy.gov [DOE]

This EA evaluates the environmental impacts of the U.S. Department of Energy's Grand Junction Projects Office's proposal to maintain and preserve the nation's immediately accessible supply of...

375

Manipulating Josephson junctions in thin-films by nearby vortices  

SciTech Connect (OSTI)

It is shown that a vortex trapped in one of the banks of a planar edge-type Josephson junction in a narrow thin-film superconducting strip can change drastically the dependence of the junction critical current on the applied field, I-c(H). When the vortex is placed at certain discrete positions in the strip middle, the pattern I-c(H) has zero at H = 0 instead of the traditional maximum of '0-type' junctions. The number of these positions is equal to the number of vortices trapped at the same location. When the junction-vortex separation exceeds similar to W, the strip width, I-c(H) is no longer sensitive to the vortex presence. The same is true for any separation if the vortex approaches the strip edges. (C) 2014 Elsevier B.V. All rights reserved.

Kogan, V.G.; Mints, R.G.

2014-07-01T23:59:59.000Z

376

Josephson Junctions and Devices fabricated by Focused Electron Beam Irradiation  

E-Print Network [OSTI]

Josephson Junctions and Devices fabricated by Focused Electron Beam Irradiation Wilfred Edwin Booij Gonville and Caius College Cambridge A dissertation submitted for the degree of Doctor of Philosophy at the University of Cambridge December 1997... Summary Josephson Junctions and Devices fabricated by Focused Electron Beam Irradiation The irradiation of high Tc superconducting thin films with a focused electron beam, such as that obtained in a scanning transmission electron microscope (STEM), can...

Booij, Wilfred Edwin

377

From Josephson junction metamaterials to tunable pseudo-cavities  

E-Print Network [OSTI]

The scattering through a Josephson junction interrupting a superconducting line is revisited including power leakage. We discuss also how to make tunable and broadband resonant mirrors by concatenating junctions. As an application, we show how to construct cavities using these mirrors, thus connecting two research fields: JJ quantum metamaterials and coupled cavity arrays. We finish by discussing the first non-linear corrections to the scattering and their measurable effects.

D. Zueco; C. Fernández-Juez; J. Yago; U. Naether; B. Peropadre; J. J. García-Ripoll; J. J. Mazo

2013-05-21T23:59:59.000Z

378

High-frequency wave sources using Josephson-junction arrays  

SciTech Connect (OSTI)

Results from Josephson-junction arrays used as high-frequency wave sources are presented. Phase-locked Josephson-junction arrays having a large number of junctions were developed to meet the need for compact submillimeter-wave sources for use in such applications as satellite communications are receivers for radioastronomical observations. The design, fabrication processes, and measurement are discussed. Distributed arrays of 40 junctions in which all Josephson junctions are placed at wavelength intervals were fabricated and tested. Such arrays can deliver about 1 [mu]W of power into a 20-60 [Omega] load resistor in the frequency ranger from 100 to 500 GHz, the upper limit being set by the large loss of the superconducting microstrip. Compact arrays were designed and fabricated to eliminate the loss of the superconducting microstrip. Those arrays have also demonstrated an output power level about 1 [mu]W into a 15 [Omega] load from 100 GHz up to 620 GHz. Characteristics of the Josephson junction source, including the power level, impedance matching, the tunability, the radiation linewidth, and tuning rate (or frequency-modulation) are discussed.

Wan, Kelin.

1991-01-01T23:59:59.000Z

379

EA-1338: Transfer of the Department of Energy Grand Junction Office to Non-DOE Ownership, Grand Junction, Colorado  

Broader source: Energy.gov [DOE]

This EA evaluates the environmental impacts for the proposed transfer of real and personal property at the U.S. Department of Energy's Grand Junction Office to non-DOE ownership.

380

Retrofit of existing 400 horsepower air compressor motor with steam turbine  

SciTech Connect (OSTI)

This paper is on the completion of a retrofit project to replace an existing 400 Horsepower air compressor motor with a steam turbine. The discussion includes visuals to show the process involved in carrying out this project. There will be in three parts. The first part of the presentation will cover the planning and construction. Planning included defining a scope, collecting data to support this scope, determining engineering feasibility, and calculating an economic payback. Construction will include the preparations for the retrofit including details of upgrades to existing systems and components, and installation of new systems and components. This will be followed by details on the actual removal of the motor, installation of the turbine, and the revision of the controls. Startup of the air compressor on steam is then discussed including necessary preparation of steam systems. Next to be presented will be some of the problems and their solutions experienced during this project. Specifically discussed will be regulatory concerns, noise of operation, insurance, and fluctuations in plant process steam demand. The conclusion of the presentation will focus on present operating status, savings demonstrated, and maintenance required.

Sanders, S.F.

1997-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Dynamically balanced, hydraulically driven compressor/pump apparatus for resonant free piston Stirling engines  

DOE Patents [OSTI]

A compressor, pump, or alternator apparatus is designed for use with a resonant free piston Stirling engine so as to isolate apparatus fluid from the periodically pressurized working fluid of the Stirling engine. The apparatus housing has a first side closed by a power coupling flexible diaphragm (the engine working member) and a second side closed by a flexible diaphragm gas spring. A reciprocally movable piston is disposed in a transverse cylinder in the housing and moves substantially at right angles relative to the flexible diaphragms. An incompressible fluid fills the housing which is divided into two separate chambers by suitable ports. One chamber provides fluid coupling between the power diaphragm of the RFPSE and the piston and the second chamber provides fluid coupling between the gas spring diaphragm and the opposite side of the piston. The working members of a gas compressor, pump, or alternator are driven by the piston. Sealing and wearing parts of the apparatus are mounted at the external ends of the transverse cylinder in a double acting arrangement for accessibility. An annular counterweight is mounted externally of the reciprocally movable piston and is driven by incompressible fluid coupling in a direction opposite to the piston so as to damp out transverse vibrations.

Corey, John A. (North Troy, NY)

1984-05-29T23:59:59.000Z

382

Hydrogen refueling station costs in Shanghai  

E-Print Network [OSTI]

total installed capital cost (TIC) 1% Of TIC 25% Estimate ofcost estimates for six station types SMR 100 a Equipment capital

Weinert, Jonathan X.; Shaojun, Liu; Ogden, Joan M; Jianxin, Ma

2007-01-01T23:59:59.000Z

383

Kansas Nuclear Profile - Wolf Creek Generating Station  

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

April 2012" "Next Release Date: February 2013" "Wolf Creek Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor...

384

Washington Nuclear Profile - Columbia Generating Station  

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

Columbia Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

385

Illinois Nuclear Profile - Dresden Generating Station  

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

Dresden Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

386

Illinois Nuclear Profile - Clinton Power Station  

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

Clinton Power Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration date"...

387

Illinois Nuclear Profile - Byron Generating Station  

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

Byron Generating Station" ,"Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration date"...

388

Massachusetts Nuclear Profile - Pilgrim Nuclear Power Station  

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

Pilgrim Nuclear Power Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer cpacity factor (percent)","Type","Commercial operation date","License...

389

Illinois Nuclear Profile - Braidwood Generation Station  

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

Braidwood Generation Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License...

390

Hydrogen Fueling Infrastructure Research and Station Technology...  

Energy Savers [EERE]

Infrastructure Research and Station Technology Download presentation slides from the DOE Fuel Cell Technologies Office webinar "An Overview of the Hydrogen Fueling Infrastructure...

391

Hydrogen refueling station costs in Shanghai  

E-Print Network [OSTI]

Fueling stations; Cost; Shanghai; Fuel cell vehicles 1.and the delivery cost for fuel cell vehicles, however, itthus hydrogen cost therefore depend on the ?eet of fuel cell

Weinert, Jonathan X.; Shaojun, Liu; Ogden, Joan M; Jianxin, Ma

2007-01-01T23:59:59.000Z

392

Microstructure of Josephson junctions: Effect on supercurrent transport in YBCO grain boundary and barrier layer junctions  

SciTech Connect (OSTI)

The electric transport of high-temperature superconductors, such as YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} (YBCO), can be strongly restricted by the presence of high-angle grain boundaries (GB). This weak-link behavior is governed by the macroscopic GB geometry and the microscopic grain boundary structure and composition at the atomic level. Whereas grain boundaries present a considerable impediment to high current applications of high T{sub c} materials, there is considerable commercial interest in exploiting the weak-link-nature of grain boundaries for the design of microelectronic devices, such as superconducting quantum interference devices (SQUIDs). The Josephson junctions which form the basis of this technology can also be formed by introducing artificial barriers into the superconductor. The authors have examined both types of Josephson junctions by EM techniques in an effort to understand the connection between microstructure/chemistry and electrical transport properties. This knowledge is a valuable resource for the design and production of improved devices.

Merkle, K.L.; Huang, Y.

1998-01-01T23:59:59.000Z

393

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

4-12: Hydrogen Cost Comparison for Electrolysis Station WithAnalysis: Electrolysis, 30 kg/day, grid Hydrogen Cost ($/kg)the hydrogen costs from the HSCM for electrolysis stations

Lipman, T E; Weinert, Jonathan X.

2006-01-01T23:59:59.000Z

394

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

4: Energy Station Grid electricity Cogen Heat Exhaust (CO2)Recycled Reformate Grid electricity Cogen Heat Electricity

Weinert, Jonathan X.; Lipman, Timothy

2006-01-01T23:59:59.000Z

395

REDUCING PISTON MASS IN A FREE PISTON ENGINE COMPRESSOR BY EXPLOITING THE INERTANCE OF A LIQUID PISTON  

E-Print Network [OSTI]

REDUCING PISTON MASS IN A FREE PISTON ENGINE COMPRESSOR BY EXPLOITING THE INERTANCE OF A LIQUID PISTON Joel A. Willhite Eric J. Barth Department of Mechanical Engineering Vanderbilt University Nashville, TN 37235-1592 eric.j.barth@vanderbilt.edu ABSTRACT A dynamic model of a free liquid piston

Barth, Eric J.

396

Study on Off-Design Steady State Performances of Helium Gas Turbo-compressor for HTGR-GT  

SciTech Connect (OSTI)

The high temperature gas-cooled reactor (HTGR) coupled with direct gas turbine cycle is a promising concept in the future of nuclear power development. Both helium gas turbine and compressor are key components in the cycle. Under normal conditions, the mode of power adjustment is to control total helium mass in the primary loop using gas storage vessels. Meanwhile, thermal power of reactor core is regulated. This article analyzes off-design performances of helium gas turbine and compressors for high temperature gas-cooled reactor with gas turbine cycle (HTGR-GT) at steady state level of electric power adjustment. Moreover, performances of the cycle were simply discussed. Results show that the expansion ratio of turbine decreases as electric power reduces but the compression ratios of compressors increase, efficiencies of both turbine and compressors decrease to some extent. Thermal power does not vary consistently with electric power, the difference between these two powers increases as electric power reduces. As a result of much thermal energy dissipated in the temperature modulator set at core inlet, thermal efficiency of the cycle has a widely reduction under partial load conditions. (authors)

Qisen Ren; Xiaoyong Yang; Zhiyong Huang; Jie Wang [Tsinghua University, Beijing, 100084 (China)

2006-07-01T23:59:59.000Z

397

Abstract--For a Compressed Air Energy Storage (CAES) approach to be viable, the air compressor/expander must be  

E-Print Network [OSTI]

Abstract-- For a Compressed Air Energy Storage (CAES) approach to be viable, the air compressor improvement can also be determined using this method. I. INTRODUCTION novel Compressed Air Energy Storage advantage of pneumatics. High pressure (~20-30MPa) compressed air is stored in a dual chamber storage vessel

Li, Perry Y.

398

Design and development of a four-cell sorption compressor based J-T cooler using R134a as working fluid  

SciTech Connect (OSTI)

The need of a cooler with no electromagnetic interference and practically zero vibration has led to sorption compressor based Joule-Thomson (J-T) coolers. These are useful for sophisticated electronic, ground based and space borne systems. In a Sorption compressor, adsorbed gases are desorbed into a confined volume by raising temperature of the sorption bed resulting in an increase in pressure of the liberated gas. In order to have the system (compressor) functioning on a continuous basis, with almost a constant gas flow rate, multiple cells are used with the adaptation of Temperature Swing Adsorption (TSA) process. As the mass of the desorbed gas dictates the compressor throughput, a combination of sorbent material with high adsorption capacity for a chosen gas or gas mixture has to be selected for efficient operation of the compressor. Commercially available (coconut-shell base) activated carbon has been selected for the present application. The characterization study for variation of discharge pressure is used to design the Four-cell sorption compressor based cryocooler with a desired output. Apart from compressor, the system includes a) After cooler b) Return gas heat exchanger c) capillary tube as the J-T expansion device and d) Evaporator.

Mehta, R. N. [Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai - 400076, India and Government Engineering College Bharuch, Gujarat - 392002 (India); Bapat, S. L.; Atrey, M. D. [Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai - 400076 (India)

2014-01-29T23:59:59.000Z

399

Interference effects in isolated Josephson junction arrays with geometric symmetries  

E-Print Network [OSTI]

As the size of a Josephson junction is reduced, charging effects become important and the superconducting phase across the link turns into a periodic quantum variable. Isolated Josephson junction arrays are described in terms of such periodic quantum variables and thus exhibit pronounced quantum interference effects arising from paths with different winding numbers (Aharonov-Casher effects). These interference effects have strong implications for the excitation spectrum of the array which are relevant in applications of superconducting junction arrays for quantum computing. The interference effects are most pronounced in arrays composed of identical junctions and possessing geometric symmetries; they may be controlled by either external gate potentials or by adding/removing charge to/from the array. Here we consider a loop of N identical junctions encircling one half superconducting quantum of magnetic flux. In this system, the ground state is found to be non-degenerate if the total number of Cooper pairs on the array is divisible by N, and doubly degenerate otherwise (after the stray charges are compensated by the gate voltages).

D. A. Ivanov; L. B. Ioffe; V. B. Geshkenbein; G. Blatter

2001-02-13T23:59:59.000Z

400

Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes  

SciTech Connect (OSTI)

This measure guideline offers additional recommendations to heating, ventilation, and air conditioning (HVAC) system designers for optimizing flexible duct, constant-volume HVAC systems using junction boxes within Air Conditioning Contractors of America (ACCA) Manual D guidance (Rutkowski, H. Manual D -- Residential Duct Systems, 3rd edition, Version 1.00. Arlington, VA: Air Conditioning Contractors of America, 2009.). IBACOS used computational fluid dynamics software to explore and develop guidance to better control the airflow effects of factors that may impact pressure losses within junction boxes among various design configurations (Beach, R., Prahl, D., and Lange, R. CFD Analysis of Flexible Duct Junction Box Design. Golden, CO: National Renewable Energy Laboratory, submitted for publication 2013). These recommendations can help to ensure that a system aligns more closely with the design and the occupants' comfort expectations. Specifically, the recommendations described herein show how to configure a rectangular box with four outlets, a triangular box with three outlets, metal wyes with two outlets, and multiple configurations for more than four outlets. Designers of HVAC systems, contractors who are fabricating junction boxes on site, and anyone using the ACCA Manual D process for sizing duct runs will find this measure guideline invaluable for more accurately minimizing pressure losses when using junction boxes with flexible ducts.

Beach, R.; Burdick, A.

2014-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Role of magnetic anisotropy in spin-filter junctions  

SciTech Connect (OSTI)

We have fabricated oxide-based spin-filter junctions in which we demonstrate that magnetic anisotropy can be used to tune the transport behavior of spin-filter junctions. We have demonstrated spin-filtering behavior in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/CoCr{sub 2}O{sub 4}/Fe{sub 3}O{sub 4} and La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/MnCr{sub 2}O{sub 4}/Fe{sub 3}O{sub 4} junctions where the interface anisotropy plays a significant role in determining transport behavior. Detailed studies of chemical and magnetic structure at the interfaces indicate that abrupt changes in magnetic anisotropy across the nonisostructural interface is the cause of the significant suppression of junction magnetoresistance in junctions with MnCr{sub 2}O{sub 4} barrier layers.

Chopdekar, R.V.; Wong, F.; Nelson-Cheeseman, B.B.; Liberati, M.; Arenholz, E.; Suzuki, Y.

2011-01-10T23:59:59.000Z

402

Microwave coupling of frequency-locked Josephson junction arrays  

SciTech Connect (OSTI)

A high temperature superconducting YBa{sub 2}Cu{sub 3}O{sub y} array of five Josephson junctions designed with additional coupling lines has been developed to demonstrate the effects of frequency locking and impedance matching for applications such as oscillators, mixers, and detectors. The Josephson self-radiation power was directly detected by a superheterodyne receiver, and Shapiro steps were also measured. The Josephson self-radiation properties reveal good quality of phase locking and microwave coupling with external circuits. The maximum self-radiation power of our array is about 50 pW which is several ten times higher than that of a single Josephson junction, and its peak point exactly satisfies the Josephson current-voltage relation. The Shapiro-step measurements show that the behavior of current-voltage curve depends on the effective inductance of coupling lines which affects the total impedance of Josephson junction array and microwave coupling. The Josephson oscillation frequency was obtained up to about 880 GHz which is 73{percent} of the maximum available frequency calculated from the characteristic voltage of the Josephson junctions. Experimental results show that this type of Josephson junction array can improve the Josephson self-radiation power and increase the maximum detectable frequency. {copyright} {ital 1997 American Institute of Physics.}

Song, I.; Eom, Y.; Park, G. [Department of Physics, Sogang University, Seoul 100-611 (Korea)] [Department of Physics, Sogang University, Seoul 100-611 (Korea); Lee, E.; Park, S. [Electronic Materials Laboratory, Samsung Advanced Institute of Technology, Suwon (Korea)] [Electronic Materials Laboratory, Samsung Advanced Institute of Technology, Suwon (Korea)

1997-06-01T23:59:59.000Z

403

Theoretical exploration of Josephson Plasma Emission in Intrinsic Josephson Junctions  

SciTech Connect (OSTI)

In this paper, the authors theoretically predict the best efficient way for electromagnetic wave emission by Josephson plasma excitation in intrinsic Josephson junctions. First, they briefly derive basic equations describing dynamics of phase differences inside junction sites in intrinsic Josephson junctions, and review the nature of Josephson plasma excitation modes based on the equations. Especially, they make an attention to that Josephson plasma modes have much different dispersion relations depending on the propagating directions and their different modes can be recognized as N standing waves propagating along ah-plane in cases of finite stacked systems composed of N junctions. Second, they consider how to excite their modes and point out that excitations of in-phase mode with the highest propagation velocity among their N modes are the most efficient way for electromagnetic wave emissions. Finally, they clarify that in-phase excitations over all junctions are possible by using Josephson vortex flow states. They show simulation results of Josephson vortex flow states resonating with some Josephson plasma modes and predict that superradiance of electromagnetic field may occur in rectangular vortex flow state in which spatiotemporal oscillations of electromagnetic fields are perfectly in-phase.

Tachiki, M.; Machida, M.

2000-07-18T23:59:59.000Z

404

(Hydrogen) Service Stations 101 Steven M. Schlasner  

E-Print Network [OSTI]

(Hydrogen) Service Stations 101 Steven M. Schlasner September 22, 2004 #12;2 DISCLAIMER Opinions · Comparison of Conventional with Hydrogen Fueling Stations · Hydrogen Fueling Life Cycle · Practical Design,000 retail outlets (350 company-owned) in 44 states · Brands: Conoco, Phillips 66, 76 · 32,800 miles pipeline

405

Modeled and measured effects of compressor downsizing in an existing air conditioner/heat pump in the cooling mode  

SciTech Connect (OSTI)

It is not uncommon to find oversized central air conditioners in residences. HVAC contractors sometimes oversize central air conditioners for one reason or another--some to the point that they may be 100% larger than needed to meet the load. Retrofit measures done to improve house envelope and distribution system efficiency also contribute to HVAC oversizing, as they reduce house heating and cooling loads. Proper sizing of an air conditioner or heat pump allows more efficient operation and provides a more comfortable environment than a highly oversized unit. Another factor that lowers operating efficiency is an improper refrigerant charge. Field inspections have revealed that about half of the units checked were not properly charged. An option available to homeowners with oversized air conditioners is to replace the existing compressor with a smaller, more efficient compressor, rather than purchasing a new, smaller unit. Such a retrofit may be economically justified, especially during a compressor failure, provided the oversizing of the existing unit is not too great. A used, 15-year old, single-package heat pump with a capillary tube expansion device on the indoor coil was purchased and tested in a set of environmental chambers to determine its cooling performance at various conditions. The system was also modeled to estimate its existing performance, and that with two different types of retrofitted state-of-the-art (SOA) efficient compressors with about 30% less capacity than the original compressor. This reduced the overall system cooling capacity by about 25%. Modeling estimated that the retrofit would increase system EER at 95 F by 30%, SEER by 34%, and reduce power demand by 39% compared to the existing unit. Reduced cycling losses account for the higher increase in SEER.

Levins, W.P.; Rice, C.K.; Baxter, V.D.

1996-05-01T23:59:59.000Z

406

Breathers in Josephson junction ladders: Resonances and electromagnetic wave spectroscopy A. E. Miroshnichenko, S. Flach, and M. V. Fistul  

E-Print Network [OSTI]

Breathers in Josephson junction ladders: Resonances and electromagnetic wave spectroscopy A. E localized states discrete breathers and linear electromagnetic excitations EE's in Josephson junction lattices 6 , and localized resistive states in Josephson junction arrays 7­10 . The latter systems

Flach, Sergej

407

Self-latching eccentric cam for dual stroke compressor or pump  

DOE Patents [OSTI]

For a dual capacity refrigerant compressor of the type which has an eccentric cam rotatable on a crankpin between two opposite positions which changes the total eccentricity of the crankpin and cam so as to obtain two different stroke lengths, the rotation of the cam on the crankpin being effected by a reversal of motor operation, the cam moves through an angle of about 270.degree. around the crankpin so that a centrifugal force torque tending to hold the cam in place is available at least in the reduced stroke length position of the cam, and by providing lightening cavities and eccentric weightings, the center of mass 74 of the cam can be shifted to obtain the centrifugal torque in the proper direction at both the maximum and reduced stroke positions.

Sisk, Francis J. (San Mateo, CA)

1985-01-01T23:59:59.000Z

408

Heat pump employing optimal refrigerant compressor for low pressure ratio applications  

DOE Patents [OSTI]

What is disclosed is a heat pump apparatus for conditioning a fluid characterized by a fluid handler for circulating the fluid in heat exchange relationship with a refrigerant fluid; two refrigerant heat exchangers; one for effecting the heat exchange with the fluid and a second refrigerant-heat exchange fluid heat exchanger for effecting a low pressure ratio of compression of the refrigerant; a rotary compressor for compressing the refrigerant with low power consumption at the low pressure ratio; at least one throttling valve connecting at the inlet side of heat exchanger in which liquid refrigerant is vaporized; a refrigerant circuit serially connecting the above elements; refrigerant in the circuit; a source of heat exchange fluid; heat exchange fluid circulating device and heat exchange fluid circuit for circulating the heat exchange fluid in heat exchange relationship with the refrigerant.

Ecker, Amir L. (Dallas, TX)

1982-01-01T23:59:59.000Z

409

Self-latching eccentric cam for dual stroke compressor or pump  

DOE Patents [OSTI]

For a dual capacity refrigerant compressor of the type which has an eccentric cam rotatable on a crankpin between two opposite positions which changes the total eccentricity of the crankpin and cam so as to obtain two different stroke lengths, the rotation of the cam on the crankpin being effected by a reversal of motor operation, the cam moves through an angle of about 270[degree] around the crankpin so that a centrifugal force torque tending to hold the cam in place is available at least in the reduced stroke length position of the cam, and by providing lightening cavities and eccentric weightings, the center of mass of the cam can be shifted to obtain the centrifugal torque in the proper direction at both the maximum and reduced stroke positions. 7 figs.

Sisk, F.J.

1985-01-22T23:59:59.000Z

410

High speed imager test station  

DOE Patents [OSTI]

A test station enables the performance of a solid state imager (herein called a focal plane array or FPA) to be determined at high image frame rates. A programmable waveform generator is adapted to generate clock pulses at determinable rates for clock light-induced charges from a FPA. The FPA is mounted on an imager header board for placing the imager in operable proximity to level shifters for receiving the clock pulses and outputting pulses effective to clock charge from the pixels forming the FPA. Each of the clock level shifters is driven by leading and trailing edge portions of the clock pulses to reduce power dissipation in the FPA. Analog circuits receive output charge pulses clocked from the FPA pixels. The analog circuits condition the charge pulses to cancel noise in the pulses and to determine and hold a peak value of the charge for digitizing. A high speed digitizer receives the peak signal value and outputs a digital representation of each one of the charge pulses. A video system then displays an image associated with the digital representation of the output charge pulses clocked from the FPA. In one embodiment, the FPA image is formatted to a standard video format for display on conventional video equipment. 12 figs.

Yates, G.J.; Albright, K.L.; Turko, B.T.

1995-11-14T23:59:59.000Z

411

Junction-based field emission structure for field emission display  

DOE Patents [OSTI]

A junction-based field emission display, wherein the junctions are formed by depositing a semiconducting or dielectric, low work function, negative electron affinity (NEA) silicon-based compound film (SBCF) onto a metal or n-type semiconductor substrate. The SBCF can be doped to become a p-type semiconductor. A small forward bias voltage is applied across the junction so that electron transport is from the substrate into the SBCF region. Upon entering into this NEA region, many electrons are released into the vacuum level above the SBCF surface and accelerated toward a positively biased phosphor screen anode, hence lighting up the phosphor screen for display. To turn off, simply switch off the applied potential across the SBCF/substrate. May be used for field emission flat panel displays.

Dinh, Long N. (Concord, CA); Balooch, Mehdi (Berkeley, CA); McLean, II, William (Oakland, CA); Schildbach, Marcus A. (Livermore, CA)

2002-01-01T23:59:59.000Z

412

Escape Time of Josephson Junctions for Signal Detection  

E-Print Network [OSTI]

In this Chapter we investigate with the methods of signal detection the response of a Josephson junction to a perturbation to decide if the perturbation contains a coherent oscillation embedded in the background noise. When a Josephson Junction is irradiated by an external noisy source, it eventually leaves the static state and reaches a steady voltage state. The appearance of a voltage step allows to measure the time spent in the metastable state before the transition to the running state, thus defining an escape time. The distribution of the escape times depends upon the characteristics of the noise and the Josephson junction. Moreover, the properties of the distribution depends on the features of the signal (amplitude, frequency and phase), which can be therefore inferred through the appropriate signal processing methods. Signal detection with JJ is interesting for practical purposes, inasmuch as the superconductive elements can be (in principle) cooled to the absolute zero and therefore can add (in practi...

Addesso, P; Pierro, V

2014-01-01T23:59:59.000Z

413

Bloch Inductance in Small-Capacitance Josephson Junctions  

SciTech Connect (OSTI)

We show that the electrical impedance of a small-capacitance Josephson junction also includes, in addition to the capacitive term -i/{omega}C{sub B}, an inductive term i{omega}L{sub B}. Similar to the known Bloch capacitance C{sub B}(q), the Bloch inductance L{sub B}(q) also depends periodically on the quasicharge, q, and its maximum value achieved at q=e(mod 2e) always exceeds the value of the Josephson inductance of this junction L{sub J}({phi}) at fixed {phi}=0. The effect of the Bloch inductance on the dynamics of a single junction and a one-dimensional array is described.

Zorin, A.B. [Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (Germany)

2006-04-28T23:59:59.000Z

414

Comparison of measurements and simulations of series-parallel incommensurate area SQUID arrays fabricated from Y Ba Cu O ion damage Josephson junctions  

E-Print Network [OSTI]

3 O 7?? ion damage Josephson junctions Shane A. Cybart, 1,2 Cu 3 O 7?? thin ?lm ion damage Josephson junctions. Theconsisted of a grid of Josephson junctions with 28 junctions

Cybart, Shane A.

2014-01-01T23:59:59.000Z

415

Environmental Audit of the Grand Junction Projects Office  

SciTech Connect (OSTI)

The Grand Junction Projects Office (GJPO) is located in Mesa County, Colorado, immediately south and west of the Grand Junction city limits. The US Atomic Energy Commission (AEC) established the Colorado Raw Materials Office at the present-day Grand Junction Projects Office in 1947, to aid in the development of a viable domestic uranium industry. Activities at the site included sampling uranium concentrate; pilot-plant milling research, including testing and processing of uranium ores; and operation of a uranium mill pilot plant from 1954 to 1958. The last shipment of uranium concentrate was sent from GJPO in January, 1975. Since that time the site has been utilized to support various DOE programs, such as the former National Uranium Resource Evaluation (NURE) Program, the Uranium Mill Tailings Remedial Action Project (UMTRAP), the Surplus Facilities Management Program (SFMP), and the Technical Measurements Center (TMC). All known contamination at GJPO is believed to be the result of the past uranium milling, analyses, and storage activities. Hazards associated with the wastes impounded at GJPO include surface and ground-water contamination and potential radon and gamma-radiation exposure. This report documents the results of the Baseline Environmental Audit conducted at Grand Junction Projects Office (GJPO) located in Grand Junction, Colorado. The Grand Junction Baseline Environmental Audit was conducted from May 28 to June 12, 1991, by the Office of Environmental Audit (EH-24). This Audit evaluated environmental programs and activities at GJPO, as well as GJPO activities at the State-Owned Temporary Repository. 4 figs., 12 tabs.

Not Available

1991-08-01T23:59:59.000Z

416

Observation of negative absolute resistance in a Josephson junction  

E-Print Network [OSTI]

We experimentally demonstrate the occurrence of negative absolute resistance (NAR) up to about $-1\\Omega$ in response to an externally applied dc current for a shunted Nb-Al/AlO$_x$-Nb Josephson junction, exposed to a microwave current at frequencies in the GHz range. The realization (or not) of NAR depends crucially on the amplitude of the applied microwave current. Theoretically, the system is described by means of the resistively and capacitively shunted junction model in terms of a moderately damped, classical Brownian particle dynamics in a one-dimensional potential. We find excellent agreement of the experimental results with numerical simulations of the model.

J. Nagel; D. Speer; T. Gaber; A. Sterck; R. Eichhorn; P. Reimann; K. Ilin; M. Siegel; D. Koelle; R. Kleiner

2008-01-28T23:59:59.000Z

417

Testing axion physics in a Josephson junction environment  

E-Print Network [OSTI]

We suggest that experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits can be used to construct a resonant environment for dark matter axions. We propose experimental setups in which axionic interaction strengths in a Josephson junction environment can be tested, similar in nature to recent experiments that test for quantum entanglement of two coupled Josephson qubits. We point out that the parameter values relevant for early-universe axion cosmology are accessible with present day's achievements in nanotechnology. We work out how typical dark matter and dark energy signals would look like in a novel detector that exploits this effect.

Beck, Christian

2011-01-01T23:59:59.000Z

418

Averaged equations for Josephson junction series arrays with LRC load  

E-Print Network [OSTI]

We derive the averaged equations describing a series array of Josephson junctions shunted by a parallel inductor-resistor-capacitor load. We assume that the junctions have negligable capacitance ($\\beta = 0$), and derive averaged equations which turn out to be completely tractable: in particular the stability of both in-phase and splay states depends on a single parameter, $\\del$. We find an explicit expression for $\\delta$ in terms of the load parameters and the bias current. We recover (and refine) a common claim found in the technical literature, that the in-phase state is stable for inductive loads and unstable for capacitive loads.

Kurt Wiesenfeld; James W. Swift

1994-08-26T23:59:59.000Z

419

Testing axion physics in a Josephson junction environment  

E-Print Network [OSTI]

We suggest that experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits can be used to construct a resonant environment for dark matter axions. We propose experimental setups in which axionic interaction strengths in a Josephson junction environment can be tested, similar in nature to recent experiments that test for quantum entanglement of two coupled Josephson qubits. We point out that the parameter values relevant for early-universe axion cosmology are accessible with present day's achievements in nanotechnology. We work out how typical dark matter and dark energy signals would look like in a novel detector that exploits this effect.

Christian Beck

2011-11-17T23:59:59.000Z

420

Three-dimensional Josephson-junction arrays: Static magnetic response  

SciTech Connect (OSTI)

In this work we present a simple three-dimensional Josephson-junction array model: a cube with twelve junctions, one on each edge. The low-field magnetic response of the system is studied numerically for arbitrary directions of the applied field. In this model the magnetic energy of the circulating currents is taken into account by introducing an effective mutual inductance matrix. The lower threshold field for flux penetration is determined in a closed analytic form for field directions perpendicular to one cube side. {copyright} {ital 1998} {ital The American Physical Society}

De Luca, R.; Di Matteo, T. [INFM-Dipartimento di Fisica, Universita degli Studi di Salerno, I-84081 Baronissi (Salerno) (Italy)] [INFM-Dipartimento di Fisica, Universita degli Studi di Salerno, I-84081 Baronissi (Salerno) (Italy); Tuohimaa, A.; Paasi, J. [Laboratory of Electricity and Magnetism, Tampere University of Technology, FIN-33101 Tampere (Finland)] [Laboratory of Electricity and Magnetism, Tampere University of Technology, FIN-33101 Tampere (Finland)

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Noise in Bose Josephson junctions: Decoherence and phase relaxation  

SciTech Connect (OSTI)

Squeezed states and macroscopic superpositions of coherent states have been predicted to be generated dynamically in Bose Josephson junctions. We solve exactly the quantum dynamics of such a junction in the presence of a classical noise coupled to the population-imbalance number operator (phase noise), accounting for, for example, the experimentally relevant fluctuations of the magnetic field. We calculate the correction to the decay of the visibility induced by the noise in the non-Markovian regime. Furthermore, we predict that such a noise induces an anomalous rate of decoherence among the components of the macroscopic superpositions, which is independent of the total number of atoms, leading to potential interferometric applications.

Ferrini, G.; Minguzzi, A.; Hekking, F. W. J. [Laboratoire de Physique et Modelisation des Milieux Condenses, Universite Joseph Fourier and CNRS, Boite Postale 166, F-38042 Grenoble (France); Spehner, D. [Laboratoire de Physique et Modelisation des Milieux Condenses, Universite Joseph Fourier and CNRS, Boite Postale 166, F-38042 Grenoble (France); Institut Fourier, Universite Joseph Fourier and CNRS, Boite Postale 74, F-38402 Saint Martin d'Heres (France)

2010-09-15T23:59:59.000Z

422

Emission of terahertz waves from stacks of intrinsic Josephson junctions.  

SciTech Connect (OSTI)

By patterning mesoscopic crystals of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (BSCCO) into electromagnetic resonators the oscillations of a large number of intrinsic Josephson junctions can be synchronized into a macroscopic coherent state accompanied by the emission of strong continuous wave THz-radiation. The temperature dependence of the emission is governed by the interplay of self-heating in the resonator and by re-trapping of intrinsic Josephson junctions which can yield a strongly non-monotonic temperature dependence of the emission power. Furthermore, proper shaping of the resonators yields THz-sources with voltage-tunable emission frequencies.

Gray, K. E.; Koshelev, A. E.; Kurter, C.; Kadowaki, K.; Yamamoto, T.; Minami, H.; Yamaguchi, H.; Tachiki, M.; Kwok, W.-K.; Welp, U.; Materials Science Division; Izmir Inst. of Tech.; Univ. Tsukuba; Univ. Tokyo

2009-06-01T23:59:59.000Z

423

Exact Quantum Dynamics of a Bosonic Josephson Junction  

SciTech Connect (OSTI)

The quantum dynamics of a one-dimensional bosonic Josephson junction is studied by solving the time-dependent many-boson Schroedinger equation numerically exactly. Already for weak interparticle interactions and on short time scales, the commonly employed mean-field and many-body methods are found to deviate substantially from the exact dynamics. The system exhibits rich many-body dynamics such as enhanced tunneling and a novel equilibration phenomenon of the junction depending on the interaction, which is attributed to a quick loss of coherence.

Sakmann, Kaspar; Streltsov, Alexej I.; Alon, Ofir E.; Cederbaum, Lorenz S. [Theoretische Chemie, Physikalisch-Chemisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

2009-11-27T23:59:59.000Z

424

Exact quantum dynamics of a bosonic Josephson junction  

E-Print Network [OSTI]

The quantum dynamics of a one-dimensional bosonic Josephson junction is studied by solving the time-dependent many-boson Schr\\"odinger equation numerically exactly. Already for weak interparticle interactions and on short time scales, the commonly-employed mean-field and many-body methods are found to deviate substantially from the exact dynamics. The system exhibits rich many-body dynamics like enhanced tunneling and a novel equilibration phenomenon of the junction depending on the interaction, attributed to a quick loss of coherence.

Kaspar Sakmann; Alexej I. Streltsov; Ofir E. Alon; Lorenz S. Cederbaum

2009-05-06T23:59:59.000Z

425

Free electron gas primary thermometer: The bipolar junction transistor  

SciTech Connect (OSTI)

The temperature of a bipolar transistor is extracted probing its carrier energy distribution through its collector current, obtained under appropriate polarization conditions, following a rigorous mathematical method. The obtained temperature is independent of the transistor physical properties as current gain, structure (Homo-junction or hetero-junction), and geometrical parameters, resulting to be a primary thermometer. This proposition has been tested using off the shelf silicon transistors at thermal equilibrium with water at its triple point, the transistor temperature values obtained involve an uncertainty of a few milli-Kelvin. This proposition has been successfully tested in the temperature range of 77–450?K.

Mimila-Arroyo, J., E-mail: jmimila@cinvestav.mx [Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Dpto. de Ing. Eléctrica-SEES, Av. Instituto Politécnico Nacional No 2508, México D.F. CP 07360 (Mexico)

2013-11-04T23:59:59.000Z

426

Estimating commuter rail demand to Kendall Square along the Grand Junction Corridor  

E-Print Network [OSTI]

Since acquiring the Grand Junction Railroad in June 2010 from CSX, the Massachusetts Bay Transit Authority (MBTA) has explored the possibility of using the line for commuter rail service. In addition the Grand Junction ...

Bockelie, Adam

2012-01-01T23:59:59.000Z

427

Interaction of Josephson Junction and Distant Vortex in Narrow Thin-Film Superconducting Strips  

SciTech Connect (OSTI)

The phase difference between the banks of an edge-type planar Josephson junction crossing the narrow thin-film strip depends on wether or not vortices are present in the junction banks. For a vortex close to the junction this effect has been seen by Golod, Rydh, and Krasnov [Phys. Rev. Lett. 104, 227003 (2010)], who showed that the vortex may turn the junction into ? type. It is shown here that even if the vortex is far away from the junction, it still changes the 0 junction to a ? junction when situated close to the strip edges. Within the approximation used, the effect is independent of the vortex-junction separation, a manifestation of the topology of the vortex phase which extends to macroscopic distances of superconducting coherence.

Kogan, V. G. [Ames Laboratory; Mints, R. G. [Tel Aviv University

2014-01-31T23:59:59.000Z

428

E-Print Network 3.0 - alter tight junction Sample Search Results  

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

if the read-out junction is in the underdamped phase... cheerful atmosphere in the Josephson junctions ii tel-00586075,version1-14Apr2011 12;iii group and thank......

429

E-Print Network 3.0 - altered tight junction Sample Search Results  

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

if the read-out junction is in the underdamped phase... cheerful atmosphere in the Josephson junctions ii tel-00586075,version1-14Apr2011 12;iii group and thank......

430

Photo of the Week: An Express Train to Crescent Junction | Department...  

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

An Express Train to Crescent Junction Photo of the Week: An Express Train to Crescent Junction January 4, 2013 - 1:53pm Addthis In the 1950s, one of the largest uranium deposits in...

431

Optimized Triple-Junction Solar Cells Using Inverted Metamorphic Approach (Presentation)  

SciTech Connect (OSTI)

Record efficiencies with triple-junction inverted metamorphic designs, modeling useful to optimize, and consider operating conditions before choosing design.

Geisz, J. F.

2008-11-01T23:59:59.000Z

432

23rd steam-station cost survey  

SciTech Connect (OSTI)

The results of the 23rd Steam Station Cost Survey covering the year 1982 are summarized. The major categories of the survey are as follows: general data; output data, 1982; fuel consumption, 1982; operation 1982 (mills/net kWh); investment ($/net kWh); energy cost, 1982 (mills/net kWh); and station performance, 1982. Thirty-one fossil-fuel steam plants and four nuclear stations were included in the survey. Fuel and operating cost increases are felt to be responsible for the moderate rise in total busbar-enery costs. 11 figures, 1 table.

Friedlander, G.D.; Going, M.C.

1983-11-01T23:59:59.000Z

433

University Climatological Station Compiled by Erwin Wodarczak (1998)  

E-Print Network [OSTI]

University Climatological Station Committee fonds Compiled by Erwin Wodarczak (1998) #12;Fonds Description University Climatological Station Committee fonds. ­ 1961-1974. 3 cm of textual records. Administrative History In 1954 a President's Climatological Station Committee was established

Handy, Todd C.

434

A Near-Term Economic Analysis of Hydrogen Fueling Stations  

E-Print Network [OSTI]

0.07/kWh has on hydrogen cost for electrolysis type station.3-12: Hydrogen Cost Comparison for Electrolysis Station,3-12: Hydrogen Cost Comparison for Electrolysis Station, NAS

Weinert, Jonathan X.

2005-01-01T23:59:59.000Z

435

A Near-term Economic Analysis of Hydrogen Fueling Stations  

E-Print Network [OSTI]

0.07/kWh has on hydrogen cost for electrolysis type station.3-12: Hydrogen Cost Comparison for Electrolysis Station,3-12: Hydrogen Cost Comparison for Electrolysis Station, NAS

Weinert, Jonathan X.

2005-01-01T23:59:59.000Z

436

Nanomechanical-resonator-induced synchronization in Josephson junction arrays B. R. Trees* and S. Natu  

E-Print Network [OSTI]

, and an interaction energy due to the piezo- electric effect between the NEM and the junctions. Phase lockingNanomechanical-resonator-induced synchronization in Josephson junction arrays B. R. Trees* and S that includes the following effects: the charging and Josephson energies of the junctions, dissipation

Stroud, David

437

Fluxon Dynamics and Radiation Emission in Twofold Long Josephson Junction Stacks  

E-Print Network [OSTI]

Fluxon Dynamics and Radiation Emission in Twofold Long Josephson Junction Stacks Andreas Wallraff¨ulich (KFA) January 27, 1997 #12;#12; Contents Introduction 1 1 Basic properties of Josephson junctions 5 2 Electrodynamics in long Josephson junctions 11 3 Radiation emission by stacked flux­flow oscillators 29 1

Leonardo, Degiorgi

438

Collapse of superconductivity in a hybrid tin-graphene Josephson junction array  

E-Print Network [OSTI]

1 Collapse of superconductivity in a hybrid tin-graphene Josephson junction array Zheng Han1 of the Josephson junction array into a zero-temperature metallic state. The suppression of proximity, models involving specific types of Josephson junction arrays in which superconducting disks are coupled

Boyer, Edmond

439

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E. Miroshnichenko,1  

E-Print Network [OSTI]

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E scattering by discrete breathers in Josephson junction ladders. DOI: 10.1103/PhysRevB.71.174306 PACS number Josephson junction systems,2 coupled nonlinear optical waveguides,3 lattice vi- brations in crystals,4

Flach, Sergej

440

PHYSICAL REVIEW B 87, 144301 (2013) Parametric amplification in Josephson junction embedded transmission lines  

E-Print Network [OSTI]

PHYSICAL REVIEW B 87, 144301 (2013) Parametric amplification in Josephson junction embedded (Josephson junctions) is studied theoretically. A continuous nonlinear wave equation describing the dynamics ranging from 1­10 MHz.9­13 These amplifiers, however, comprise a single Josephson junction or an array

Friedland, Lazar

Note: This page contains sample records for the topic "junction compressor station" 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

Andreev-level spectroscopy and Josephson-current switching in a three-terminal Josephson junction  

E-Print Network [OSTI]

Andreev-level spectroscopy and Josephson-current switching in a three-terminal Josephson junction H held in thermodynamic equilibrium with the two superconducting contacts of a Josephson junction. When levels. The additional normal-metal probe coupled to the Josephson junction, shown in Fig. 1, models

Demir, Hilmi Volkan

442

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E. Miroshnichenko,1  

E-Print Network [OSTI]

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E in Josephson junction ladders. We predict the existence of Fano resonances, and find them by computing in the plasmon scattering by discrete breathers in Josephson junction ladders. DOI: 10.1103/PhysRevB.71

443

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity  

E-Print Network [OSTI]

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity Gianne Derks , Arjen Doelman Christopher J.K. Knight§ , Hadi Susanto¶ July 5, 2011 Abstract We consider a Josephson junction as limits of our results on microresonators. Keywords: Josephson junction, inhomogeneous sine

Wirosoetisno, Djoko

444

Magnetic field penetration in a long Josephson junction imbedded in a wide stripline  

E-Print Network [OSTI]

Magnetic field penetration in a long Josephson junction imbedded in a wide stripline Andreas Franz The dependence of the first critical field of long linear and annular Josephson junctions on the width A Josephson junction is formed by two superconductors separated by a thin oxide layer allowing the tunneling

Wallraff, Andreas

445

Quantum Coherence in a Superfluid Josephson Junction Supradeep Narayana and Yuki Sato  

E-Print Network [OSTI]

Quantum Coherence in a Superfluid Josephson Junction Supradeep Narayana and Yuki Sato The Rowland in which we take an array of nanoscale apertures that form a superfluid 4He Josephson junction and apply Josephson junctions as well as phase coherence among the superfluid aperture array are discussed. DOI: 10

Sato, Yuki

446

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity  

E-Print Network [OSTI]

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity Gianne Derks , Arjen as limits of our results on microresonators. Keywords: Josephson junction, inhomogeneous sine Josephson junction tt = xx - D sin() + - t, (1) where x and t are the spatial and temporal variable

Doelman, Arjen

447

Three-dimensional Josephson junction networks with coupling inhomogeneities in magnetic fields  

E-Print Network [OSTI]

Three-dimensional Josephson junction networks with coupling inhomogeneities in magnetic fields A on the static magnetic response of a three-dimensional 8 · 8 · 8 network of Josephson junctions is studied of one-dimensional and two-dimensional Josephson junction networks (1D, 2D-JJNs) has been extensively

Di Matteo, Tiziana

448

Direct Observation of Dynamical Bifurcation in a Superfluid Josephson Junction Supradeep Narayana and Yuki Sato  

E-Print Network [OSTI]

Direct Observation of Dynamical Bifurcation in a Superfluid Josephson Junction Supradeep Narayana Josephson junction. We excite the superfluid plasma resonance into a nonlinear regime by driving below.205302 PACS numbers: 67.25.dg, 07.60.Ly, 47.20.Ky, 85.25.Cp A superfluid Josephson junction is formed

Sato, Yuki

449

Josephson-junction arrays with long-range interactions J. Kent Harbaugh and D. Stroud  

E-Print Network [OSTI]

Josephson-junction arrays with long-range interactions J. Kent Harbaugh and D. Stroud Department-voltage (IV) characteristics of a Josephson-junction array with long-range inter- actions. The array consists of two sets of equally spaced parallel superconducting wires placed at right angles. A Josephson junction

Stroud, David

450

Quantum phase transitions and persistent currents in Josephson-junction ladders Minchul Lee  

E-Print Network [OSTI]

Quantum phase transitions and persistent currents in Josephson-junction ladders Minchul Lee- dimensional Josephson-junction arrays. We will focus particularly on the roles of excitonlike pairs.40.Db, 73.23.Hk I. INTRODUCTION Systems of Josephson junctions between small supercon- ducting grains

Choi, Mahn-Soo

451

Phase qubits fabricated with trilayer junctions M. Weides1,2  

E-Print Network [OSTI]

Josephson junction geometry with minimal volume of lossy isolation dielectric, being suitable for higher) spectroscopy and time-domain measurements of the qubit. By systematically replacing only the Josephson junction element, and, ideally, develop low-loss Josephson junctions for superconducting qubits and improve our

Martinis, John M.

452

Depinning of kinks in a Josephson-junction ratchet array E. Trias,1  

E-Print Network [OSTI]

Depinning of kinks in a Josephson-junction ratchet array E. Tri´as,1 J. J. Mazo,1,2 F. Falo,2 and T kinks in a ratchet potential using a fabricated circular array of Josephson junctions. Our ratchet . Josephson junctions are solid state realizations of a simple pendulum. By coupling them, it is possible

Orlando, Terry P.

453

Switching current measurements of large area Josephson tunnel junctions A. Wallraff,a)  

E-Print Network [OSTI]

the potential. This corresponds to a transition of the Josephson junction from a superconducting zero the system is coupled. Thermal activation TA in a current-biased Josephson junction has been studied both damping.11,12 At low temperatures the quantum mechanical properties of Josephson junctions have been

Wallraff, Andreas

454

DESIGN APPROACHES AND MATERIALS PROCESSES FOR ULTRAHIGH EFFICIENCY LATTICE MISMATCHED MULTI-JUNCTION SOLAR CELLS  

E-Print Network [OSTI]

-JUNCTION SOLAR CELLS Melissa J. Griggs 1 , Daniel C. Law 2 , Richard R. King 2 , Arthur C. Ackerman 3 , James M heterostructures grown in a multi-junction solar cell-like structure by MOCVD. Initial solar cell data are also of the minority carrier lifetime. INTRODUCTION High efficiency triple junction solar cells have recently been

Atwater, Harry

455

Higher-order effects on Shapiro steps in Josephson junctions Kim O" . Rasmussen and Vadim Zharnitsky*  

E-Print Network [OSTI]

Higher-order effects on Shapiro steps in Josephson junctions Kim O" . Rasmussen and Vadim is that the pendulum equation is the most widely used model for super- conducting Josephson junctions.1,8 Particularly Josephson junction, where phase-locking of the voltage response to an ac current can occur in certain

Zharnitsky, Vadim

456

Josephson Junction with a Magnetic-Field Tunable Ground State E. Goldobin,1  

E-Print Network [OSTI]

Josephson Junction with a Magnetic-Field Tunable Ground State E. Goldobin,1 D. Koelle,1 R. Kleiner; published 21 November 2011) We consider an asymmetric 0- Josephson junction consisting of 0 and regions.25.Cp Josephson junctions (JJs) with a phase shift of in the ground state [1] attracted a lot

Mints, Roman G.

457

SIS Josephson junction with a correlated insulator below its SI transition  

E-Print Network [OSTI]

S­I­S Josephson junction with a correlated insulator below its S­I transition C.D. Porter Accepted 31 December 2013 Available online 9 January 2014 Keywords: Josephson junction array Superconductor, with a correlated insulating region, can be viewed as a single effective Josephson junction. � 2014 Elsevier B

Stroud, David

458

Josephson junction in a thin film V. G. Kogan, V. V. Dobrovitski, and J. R. Clem  

E-Print Network [OSTI]

Josephson junction in a thin film V. G. Kogan, V. V. Dobrovitski, and J. R. Clem Ames Laboratory The phase difference (y) for a vortex at a line Josephson junction in a thin film attenuates at large was normal to the film faces unlike traditional thin-film large- area Josephson junctions in which

Mints, Roman G.

459

Quantum Monte Carlo study of a disordered 2D Josephson junction array  

E-Print Network [OSTI]

Quantum Monte Carlo study of a disordered 2D Josephson junction array W.A. Al-Saidi *, D. Stroud reserved. PACS: 74.25.Dw; 05.30.Jp; 85.25.Cp Keywords: Josephson junctions; Quantum Monte Carlo; Disorder 1. Introduction A Josephson junction array (JJA) consists of a collection of superconducting islands connected

Stroud, David

460

The chaotic oscillations of a Josephson junction with external magnetic field  

SciTech Connect (OSTI)

Using the Melnikov Method the oscillation of a single Josephson junction with external magnetic field and DC bias is analyzed. Under the external magnetic field the junction can operate in chaos even if there is no bias. The numerical results show that in dependence on some parameters the Josephson junction with external magnetic field will go from stable periodic states to chaotic states.

Ma, J.G.; Wolff, I. [Duisburg Univ. (Germany). Dept. of Electrical Engineering

1996-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Washing out of the 0-transition in Josephson junctions R. Avriller1  

E-Print Network [OSTI]

Washing out of the 0- transition in Josephson junctions R. Avriller1 and F. Pistolesi1 1 Univ: July 21, 2014) We consider a Josephson junction formed by a quantum dot connected to two bulk numbers: 73.23.-b, 74.25.F-, 74.50.+r, 74.45.+c Introduction.-- The Josephson junction is a fun- damental

Boyer, Edmond

462

Hydrogen Fueling Station in Honolulu, Hawaii Feasibility Analysis...  

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

Station in Honolulu, Hawaii Feasibility Analysis Hydrogen Fueling Station in Honolulu, Hawaii Feasibility Analysis This feasibility report assesses the technical and economic...

463

EECBG Success Story: Police Station Triples Solar Power - and...  

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

Police Station Triples Solar Power - and Savings EECBG Success Story: Police Station Triples Solar Power - and Savings July 19, 2010 - 11:00am Addthis North Community Police...

464

Alternative Fueling Station Locator App Provides Info at Your...  

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

Fueling Station Locator website. It provides information on more than 15,000 public and private alternative fueling stations throughout the United States. The app lists where...

465

Pdc - The Worldwide Leader in Hydrogen Refueling Station Compression...  

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

Pdc - The Worldwide Leader in Hydrogen Refueling Station Compression Pdc - The Worldwide Leader in Hydrogen Refueling Station Compression This presentation by Matther Weaver of Pdc...

466

Hydrogen Refueling Station Costs in Shanghai  

E-Print Network [OSTI]

stations and vendors (e.g. Air Products and Chemicals, Inc,including Chevron and Air Products and Chemicals, Inc. , asDiesel a. Verified with Air Products representative, Feb

Weinert, Jonathan X.; Shaojun, Liu; Ogden, J; Jianxin, Ma

2006-01-01T23:59:59.000Z

467

IntegratedScienceWorkingforYou Research Station  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . .5 Colorado's forest resources, 2002-2006 . . . . . . . . .6 Post Mountain Research Station Federal Recycling Program Printed on Recycled Paper The Rocky Mountain Research organi- zation--the most extensive natural resources research organization in the world. We maintain 14

468

Hydrogen Refueling Station Costs in Shanghai  

E-Print Network [OSTI]

and the delivery cost for fuel cell vehicles, however, itfueling stations, cost, Shanghai, fuel cell vehicles 1.0hydrogen cost therefore depend on the fleet of fuel cell

Weinert, Jonathan X.; Shaojun, Liu; Ogden, J; Jianxin, Ma

2006-01-01T23:59:59.000Z

469

The College Station Residential Energy Compliance Code  

E-Print Network [OSTI]

The City of College Station, Texas adopted a new residential Energy Compliance Code in January, 1988. The code, which strengthens compliance requirements in several areas, has received broadly based support and acceptance from all major constituent...

Claridge, D. E.; Schrock, D.

1988-01-01T23:59:59.000Z

470

Field Station Contributors, 2010 Acton, Gary  

E-Print Network [OSTI]

Field Station Contributors, 2010 Acton, Gary Allen, Deborah and Harry Ardell, Robert and Lee Baker Mead, Judson and Jane Mead, Thomas and Lenore Merritt, Andrew and Eleanor Morganwalp, David and Jill

Polly, David

471

Hydrogen Refueling Station Costs in Shanghai  

E-Print Network [OSTI]

Well-to-wheels analysis of hydrogen based fuel-cell vehicleJP, et al. Distributed Hydrogen Fueling Systems Analysis,”Year 2006 UCD—ITS—RR—06—04 Hydrogen Refueling Station Costs

Weinert, Jonathan X.; Shaojun, Liu; Ogden, Joan M; Jianxin, Ma

2006-01-01T23:59:59.000Z

472

Hydrogen Fueling Infrastructure Research and Station Technology  

Broader source: Energy.gov [DOE]

Presentation slides from the DOE Fuel Cell Technologies Office webinar "An Overview of the Hydrogen Fueling Infrastructure Research and Station Technology (H2FIRST) Project" held on November 18, 2014.

473

Tunneling Qubit Operation on a Protected Josephson Junction Array  

E-Print Network [OSTI]

We discuss a protected quantum computation process based on a hexagon Josephson junction array. Qubits are encoded in the punctured array, which is topologically protected. The degeneracy is related to the number of holes. The topological degeneracy is lightly shifted by tuning the flux through specific hexagons. We also show how to perform single qubit operation and basic quantum gate operations in this system.

Zhi Yin; Sheng-Wen Li; Yi-Xin Chen

2010-01-29T23:59:59.000Z

474

Topological order in Josephson junction ladders with Mobius boundary conditions  

E-Print Network [OSTI]

We propose a CFT description for a closed one-dimensional fully frustrated ladder of quantum Josephson junctions with Mobius boundary conditions, in particular we show how such a system can develop topological order. Such a property is crucial for its implementation as a "protected" solid state qubit.

G. Cristofano; V. Marotta; A. Naddeo

2005-03-22T23:59:59.000Z

475

Particle pulses from superconducting aluminum tunnel junction detectors  

SciTech Connect (OSTI)

Superconducting aluminum tunnel junctions have been developed for use as particle detectors. This paper presents results on static characteristics of these devices. We also present results from tests of these detectors with 6-keV X-rays. An extrapolation of the properties of these detectors to one suitable for dark-matter detectors is discussed.

Stricker, D.A.; Bing, D.D.; Bland, R.W.; Dickson, S.C.; Dignan, T.; Johnson, R.T.; Lockhart, J.M.; Laws, K.; Simon, M.W.; Watson, R. (San Francisco State Univ., Physics and Astronomy Dept. San Francisco, CA (US))

1991-03-01T23:59:59.000Z

476

Determination of the current density distribution in Josephson junctions.  

SciTech Connect (OSTI)

A technique is described for recovering the missing phase information for a set of critical current measurements as a function of an applied magnetic field I{sub c}(B). In many cases the current density j(x) across the boundary for a Josephson junction can be determined.

Carmody, M; Landree, E.; Marks, L. D.; Merkle, K. L.; Northwestern Univ.

1999-01-01T23:59:59.000Z

477

Distinguished solutions for discontinuous signature change with weak junction conditions  

E-Print Network [OSTI]

We consider discontinuous signature change with the weak junction condition favoured by Ellis et. al. (1992). We impose certain regularity conditions and investigate the space of solutions (considered as one-parameter families of three-dimensional Riemannian manifolds) for dust and scalar field models.

M. Kriele

1996-10-10T23:59:59.000Z

478

Repowering of the Midland Nuclear Station  

E-Print Network [OSTI]

REPOWERING OF THE MIDLAND NUCLEAR STATION C.E. Gatlin Jr. Gerald C. Velleroer Janes A. Mooney Manager of Projects Fluor Daniel, IrK::. Vice President Fluor Daniel, IrK::. Vice President Midlarrl eogneneration Venture Chicago, Illinois... Chicago, Illinois Midland, Michigan The conversion of the Midland Nuclear Station to a combined cycle power facility is the first of its kind. The eXisting nuclear steam turbine, combined with new, natural-gas-fired gas turbines, will create...

Gatlin, C. E. Jr.; Vellender, G. C.; Mooney, J. A.

479

Solar and Infrared Radiation Station (SIRS) Handbook  

SciTech Connect (OSTI)

The Solar Infrared Radiation Station (SIRS) provides continuous measurements of broadband shortwave (solar) and longwave (atmospheric or infrared) irradiances for downwelling and upwelling components. The following six irradiance measurements are collected from a network of stations to help determine the total radiative flux exchange within the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) Climate Research Facility: • Direct normal shortwave (solar beam) • Diffuse horizontal shortwave (sky) • Global horizontal shortwave (total hemispheric) • Upwelling shortwave (reflected) • Downwelling longwave (atmospheric infrared) • Upwelling longwave (surface infrared)

Stoffel, T

2005-07-01T23:59:59.000Z

480

Numerical simulations of output pulse extraction from a high-power microwave compressor with a plasma switch  

SciTech Connect (OSTI)

Numerical simulations of the process of electromagnetic energy release from a high-power microwave pulse compressor comprising a gas-filled cavity and interference switch were carried out. A microwave plasma discharge in a rectangular waveguide H-plane tee was modeled with the use of the fully electromagnetic particle-in-cell code MAGIC. The gas ionization, plasma evolution, and interaction with RF fields accumulated within the compressor were simulated using different approaches provided by the MAGIC code: particle-in-cell approach accounting for electron-neutral collisions, gas conductivity model based on the concept of mobility, and hybrid modeling. The dependences of the microwave output pulse peak power and waveform on parameters that can be controlled in experiments, such as an external ionization rate, RF field amplitude, and background gas pressure, were investigated.

Shlapakovski, Anatoli; Beilin, Leonid; Bliokh, Yuri; Donskoy, Moshe; Krasik, Yakov E. [Physics Department, Technion, Haifa 32000 (Israel); Hadas, Yoav [Department of Applied Physics, Rafael, PO Box 2250, Haifa 31021 (Israel); Schamiloglu, Edl [Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, New Mexico 87131 (United States)

2014-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "junction compressor station" 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

Reseach and development of energy-efficient appliance motor-compressors. Final report. Volume III: development and field test plan  

SciTech Connect (OSTI)

By means of a program of theoretical analysis, development, and testing of samples, it was found that significant improvements could be made in the energy efficiency ratio (EER) of hermetic motor-compressor assemblies. The high efficiency designs resulting from the development program are believed to be suitable for quantity production without excessive facilities cost, to have acceptable levels of performance and reliability, and to be producible at costs which will make them commercially attractive. The steps involved in the development of the improved compressor design are described in detail. The major purpose of Phase II of the project is to verify the reliability of the high-efficiency designs by means of a field demonstration program.

Nelson, R.T.; MacCarthy, P.W.

1980-09-01T23:59:59.000Z

482

Aluminum tunnel junction detector operation in an adiabatic demagnetization refrigerator  

SciTech Connect (OSTI)

Superconducting tunnel junction detectors are being developed as both particle and X-ray detectors. Aluminum junctions are desirable for detectors because of their strong native oxide barriers, and because the small energy gap of aluminum is a good match to ballistic phonons generated by particle interactions in single crystals of silicon or other low acoustic-loss insulating crystals. Aluminum tunnel junction detectors must be operated near 0.1 T{sub C} which is 110 mK for aluminum. To operate detectors at these temperatures, we have developed adiabatic demagnetization refrigerators (ADRs) for the laboratory and prototype ADRs for space based operation. These cryogenic systems are simpler, more convenient and more portable than most dilution refrigerators. We have demonstrated that the magnetic field of the ADR need not compromise the performance of aluminum tunnel junctions. We have recently initiated a program to develop superconducting tunnel junctions (STJs) as high resolution X-ray detectors and low energy threshold particle detectors. This complements our existing program in which we are developing high resolution X-ray microcalorimeter detectors. One of our goals for both of these cryogenic detector development efforts is to observe X-ray emission from cosmic sources. This requires a refrigeration system that can operate under zero gravity space flight conditions. For the microcalorimeter project, temperatures of 100 mK and below are required to sufficiently reduce the heat capacity of the device. We have therefore developed an adiabatic demagnetization refrigerator (ADR) system which can be configured for space flight.

Labov, S.; Silver, E.; Le Gros, M. (Lawrence Livermore National Lab., CA (United States)); Bland, R.W.; Dickson, S.C.; Dignan, T.G.; Laws, K.; Johnson, R.T.; Simon, M.W.; Stricker, D.A.; Watson, R.M. (San Francisco State Univ., CA (United States)); Madden, N.; Landis, D. (Lawrence Berkeley Lab., CA (United States))

1992-01-30T23:59:59.000Z

483

Field demonstration of optimized variable speed compressor and condenser fan control for commercial refrigeration systems. Final report  

SciTech Connect (OSTI)

The demonstration project discussed in this report consisted of two separate programs intended to examine methods of implementing variable-frequency drives (VFDs) to increase the efficiency of supermarket refrigeration racks. The first program examined the optimum control strategy for minimizing the power consumption of medium-temperature parallel compressor racks driven by VFDs. The second program, aimed at developing the optimum control strategy for variable-speed control of supermarket condenser fans.

NONE

1997-11-01T23:59:59.000Z

484

Quantum efficiency of a microwave photon detector based on a current-biased Josephson junction  

E-Print Network [OSTI]

We analyze the quantum efficiency of a microwave photon detector based on a current-biased Josephson junction. We consider the Jaynes-Cummings Hamiltonian to describe coupling between the photon field and the junction. We then take into account coupling of the junction and the resonator to the environment. We solve the equation of motion of the density matrix of the resonator-junction system to compute the quantum efficiency of the detector as a function of detection time, bias current, and energy relaxation time. Our results indicate that junctions with modest coherence properties can provide efficient detection of single microwave photons, with quantum efficiency in excess of 80%.

Poudel, Amrit; Vavilov, Maxim G

2012-01-01T23:59:59.000Z

485

Mutual synchronization of two stacks of intrinsic Josephson junctions in cuprate superconductors  

SciTech Connect (OSTI)

Certain high-T{sub c} cuprate superconductors, which naturally realize a stack of Josephson junctions, thus can be used to generate electromagnetic waves in the terahertz region. A plate-like single crystal with 10{sup 4} junctions without cavity resonance was proposed to achieve strong radiation. For this purpose, it is required to synchronize the Josephson plasma oscillation in all junctions. In this work, we propose to use two stacks of junctions shunted in parallel to achieve synchronization. The two stacks are mutually synchronized in the whole IV curve, and there is a phase shift between the plasma oscillation in the two stacks. The phase shift is nonzero when the number of junctions in different stacks is the same, while it can be arbitrary when the number of junctions is different. This phase shift can be tuned continuously by applying a magnetic field when all the junctions are connected by superconducting wires.

Lin, Shi-Zeng [Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2014-05-07T23:59:59.000Z

486

Quantum Dissociation of a Vortex-Antivortex Pair in a Long Josephson Junction M.V. Fistul,1  

E-Print Network [OSTI]

Quantum Dissociation of a Vortex-Antivortex Pair in a Long Josephson Junction M.V. Fistul,1 A VAV pair manifests itself in a switching of the Josephson junction from the superconducting biased single Josephson junctions (JJs), various SQUIDs, and small Josephson junction arrays, contain

Wallraff, Andreas

487

PHYSICAL REVIEW B 87, 214511 (2013) Linewidth of the electromagnetic radiation from Josephson junctions near cavity resonances  

E-Print Network [OSTI]

emission from intrinsic Josephson junctions in high-Tc cuprate superconductors has been detected recently for a single Josephson junction nor for a stack of the intrinsic Josephson junctions realized in cuprateRevB.87.214511 PACS number(s): 74.50.+r, 74.25.Gz, 85.25.Cp In a Josephson junction (JJ) biased by a dc

Alexei, Koshelev

488

Model based multivariable controller for large scale compression stations. Design and experimental validation on the LHC 18KW cryorefrigerator  

SciTech Connect (OSTI)

In this paper, a multivariable model-based non-linear controller for Warm Compression Stations (WCS) is proposed. The strategy is to replace all the PID loops controlling the WCS with an optimally designed model-based multivariable loop. This new strategy leads to high stability and fast disturbance rejection such as those induced by a turbine or a compressor stop, a key-aspect in the case of large scale cryogenic refrigeration. The proposed control scheme can be used to have precise control of every pressure in normal operation or to stabilize and control the cryoplant under high variation of thermal loads (such as a pulsed heat load expected to take place in future fusion reactors such as those expected in the cryogenic cooling systems of the International Thermonuclear Experimental Reactor ITER or the Japan Torus-60 Super Advanced fusion experiment JT-60SA). The paper details how to set the WCS model up to synthesize the Linear Quadratic Optimal feedback gain and how to use it. After preliminary tuning at CEA-Grenoble on the 400W@1.8K helium test facility, the controller has been implemented on a Schneider PLC and fully tested first on the CERN's real-time simulator. Then, it was experimentally validated on a real CERN cryoplant. The efficiency of the solution is experimentally assessed using a reasonable operating scenario of start and stop of compressors and cryogenic turbines. This work is partially supported through the European Fusion Development Agreement (EFDA) Goal Oriented Training Program, task agreement WP10-GOT-GIRO.

Bonne, François; Bonnay, Patrick [INAC, SBT, UMR-E 9004 CEA/UJF-Grenoble, 17 rue des Martyrs, 38054 Grenoble (France); Alamir, Mazen [Gipsa-Lab, Control Systems Department, CNRS-University of Grenoble, 11, rue des Mathématiques, BP 46, 38402 Saint Martin d'Hères (France); Bradu, Benjamin [CERN, CH-1211 Genève 23 (Switzerland)

2014-01-29T23:59:59.000Z

489

Hydrogen Fueling - Coming Soon to a Station Near You (Brochure)  

SciTech Connect (OSTI)

Fact sheet providing information useful to local permitting officials facing hydrogen fueling station proposals.

Not Available

2009-04-01T23:59:59.000Z

490

Station Processing for a Low Frequency Array in WA  

E-Print Network [OSTI]

for the remote station, minus 2 kW for cooling (considered "infrastructure"). #12;Station Processing Requirements stations (regardless of role as remote or core) (yes; remote stations can be "less" not "different") 2 (yes: 2-3 for core, 1 for remote) 6. Cost: TBD. (Prorated cost of ~US$500 per dual-pol element

Ellingson, Steven W.

491

The LOFAR Super Station concept : an input for discussion  

E-Print Network [OSTI]

throughout Europe : several stations in Germany1 , UK2 , soon a French LOFAR station in Nançay3 , and further contacts in several other countries4 FLOW context · Official decision for funding the French station taken MHz) o Incoherent addition of the same stations to synthesize a broad instantaneous beam (maximum

Demoulin, Pascal

492

MHD compressor---expander conversion system integrated with GCR inside a deployable reflector  

SciTech Connect (OSTI)

This work originates from the proposal MHD Compressor-Expander Conversion System Integrated with a GCR Inside a Deployable Reflector''. The proposal concerned an innovative concept of nuclear, closed-cycle MHD converter for power generation on space-based systems in the multi-megawatt range. The basic element of this converter is the Power Conversion Unit (PCU) consisting of a gas core reactor directly coupled to an MHD expansion channel. Integrated with the PCU, a deployable reflector provides reactivity control. The working fluid could be either uranium hexafluoride or a mixture of uranium hexafluoride and helium, added to enhance the heat transfer properties. The original Statement of Work, which concerned the whole conversion system, was subsequently redirected and focused on the basic mechanisms of neutronics, reactivity control, ionization and electrical conductivity in the PCU. Furthermore, the study was required to be inherently generic such that the study was required to be inherently generic such that the analysis an results can be applied to various nuclear reactor and/or MHD channel designs''.

Tuninetti, G. (Ansaldo S.p.A., Genoa (Italy). Research Div.); Botta, E.; Criscuolo, C.; Riscossa, P. (Ansaldo S.p.A., Genoa (Italy). Nuclear Div.); Giammanco, F. (Pisa Univ. (Italy). Dipt. di Fisica); Rosa-Clot, M. (Florence Univ. (Italy). Dipt. di Fisica)

1989-04-20T23:59:59.000Z

493

Condenser, compressor, and HRSG cleaning in combined cycles: How often is too often?  

SciTech Connect (OSTI)

The true cost of electric power production consists of capital, fuel, and operation and maintenance (O&M) expense. Decisions are made every day regarding how O&M budget is spent, often affecting plant efficiency and output, and impacting the {open_quotes}bottom line.{close_quotes} As power producers strive to become more competitive, management will require strategies to minimize total production costs, and maximize profits. One such strategy is to clean equipment often enough to maintain good performance, but not too frequently as to exhaust O&M budgets. Examples for a combined cycle unit are gas turbine compressor washes, blast cleaning of HRSG gas-side tube surfaces, and condenser tube cleaning. Each of these tasks restores equipment performance, increasing output. Associated with each, though, is an expense, such as downtime, labor, materials, contractor invoice, and waste disposal. If these tasks are performed too often, excess expense will not be justified by improved output. If done infrequently, the potential for increased revenue and/or fuel cost savings will not be realized. For each task, there is an optimum scheduling interval which will produce the lowest combination of O&M expense and lost revenue. A simple calculation which uses periodic performance testing, monitoring and analysis can determine an optimum maintenance interval for many tasks. In virtually any plant with reasonable instrumentation, a program can be established to determine optimum schedules for most routine performance-improvement maintenance tasks.

Kock, J. [Power Plant Performance Specialists, Lansdowne, PA (United States); DeGeeter, S. [Ocean State Power, Harrisville, NY (United States); Haynes, C.J. [New England Power Co., Somerset, MA (United States)

1996-05-01T23:59:59.000Z

494

FERROELECTRIC SWITCH FOR A HIGH-POWER Ka-BAND ACTIVE PULSE COMPRESSOR  

SciTech Connect (OSTI)

Results are presented for design of a high-power microwave switch for operation at 34.3 GHz, intended for use in an active RF pulse compressor. The active element in the switch is a ring of ferroelectric material, whose dielectric constant can be rapidly changed by application of a high-voltage pulse. As envisioned, two of these switches would be built into a pair of delay lines, as in SLED-II at SLAC, so as to allow 30-MW ?s-length Ka-band pulses to be compressed in time by a factor-of-9 and multiplied in amplitude to generate 200 MW peak power pulses. Such high-power pulses could be used for testing and evaluation of high-gradient mm-wave accelerator structures, for example. Evaluation of the switch design was carried out with an X-band (11.43 GHz) prototype, built to incorporate all the features required for the Ka-band version.

Hirshfield, Jay L. [Omega-P, Inc.] [Omega-P, Inc.

2013-12-18T23:59:59.000Z

495

Multi-bottle, no compressor, mean pressure control system for a Stirling engine  

DOE Patents [OSTI]

The invention relates to an apparatus for mean pressure control of a Stirling engine without the need for a compressor. The invention includes a multi-tank system in which there is at least one high pressure level tank and one low pressure level tank wherein gas flows through a maximum pressure and supply line from the engine to the high pressure tank when a first valve is opened until the maximum pressure of the engine drops below that of the high pressure tank opening an inlet regulator to permit gas flow from the engine to the low pressure tank. When gas flows toward the engine it flows through the minimum pressure supply line 2 when a second valve is opened from the low pressure tank until the tank reaches the engine's minimum pressure level at which time the outlet regulator opens permitting gas to be supplied from the high pressure tank to the engine. Check valves between the two tanks prevent any backflow of gas from occurring.

Corey, John A. (Melrose, NY)

1990-01-01T23:59:59.000Z

496

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

station. H2Gen’s estimates for capital costs are also lowerestimates and show high variability (26%-117% of capital costs).capital costs of about $250,000. Existing hydrogen station cost analyses tend to under-estimate

Weinert, Jonathan X.; Lipman, Timothy

2006-01-01T23:59:59.000Z

497

Strain designed Josephson $?$ junction qubits with topological insulators  

E-Print Network [OSTI]

A Josephson qubit is designed via the application of a tensile strain to a topological insulator surface sandwiched between two s-wave superconductors. The strain applied leads to a shift in the Dirac point without changing the pre-existing conducting states, on the surface of a topological insulator. Strain applied can be tuned to form a $\\pi$ junction in such a structure. Combining two such junctions in a ring architecture leads to the ground state of the ring being in doubly degenerate state- the "0" and "1" states of a qubit. A qubit designed this way is quite easily controlled via the tunable strain applied. We report on the conditions necessary to design such a qubit. Finally the operating time of a single qubit phase gate is derived.

Colin Benjamin

2015-04-09T23:59:59.000Z

498

Towards understanding junction degradation in cadmium telluride solar cells  

SciTech Connect (OSTI)

A degradation mechanism in cadmium telluride (CdTe/CdS) solar cells is investigated using time-dependent numerical modeling to simulate various temperature, bias, and illumination stress conditions. The physical mechanism is based on defect generation rates that are proportional to nonequilibrium charge carrier concentrations. It is found that a commonly observed degradation mode for CdTe/CdS solar cells can be reproduced only if defects are allowed to form in a narrow region of the absorber layer close to the CdTe/CdS junction. A key aspect of this junction degradation is that both mid-gap donor and shallow acceptor-type defects must be generated simultaneously in response to photo-excitation or applied bias. The numerical approach employed here can be extended to study other mechanisms for any photovoltaic technology.

Nardone, Marco, E-mail: marcon@bgsu.edu [Department of Environment and Sustainability, Bowling Green State University, Bowling Green, Ohio 43403 (United States)

2014-06-21T23:59:59.000Z

499

Transient Dynamics in Molecular Junctions: Coherent Bichromophoric Molecular Electron Pumps  

E-Print Network [OSTI]

The possibility of using single molecule junctions as electron pumps for energy conversion and storage is considered. It is argued that the small dimensions of these systems enable to make use of unique intra-molecular quantum coherences in order to pump electrons between two leads and to overcome relaxation processes which tend to suppress the pumping efficiency. In particular, we demonstrate that a selective transient excitation of one chromophore in a bi-chromophoric donor-bridge-acceptor molecular junction model yields currents which transfer charge (electron and holes) unevenly to the two leads in the absence of a bias potential. The utility of this mechanism for charge pumping in steady state conditions is proposed.

Roie Volkovich; Uri Peskin

2010-12-01T23:59:59.000Z

500

Josephson Junction Arrays with Bose-Einstein Condensates  

E-Print Network [OSTI]

We report on the direct observation of an oscillating atomic current in a one-dimensional array of Josephson junctions realized with an atomic Bose-Einstein condensate. The array is created by a laser standing-wave, with the condensates trapped in the valleys of the periodic potential and weakly coupled by the inter-well barriers. The coherence of multiple tunneling between adjacent wells is continuously probed by atomic interference. The square of the small-amplitude oscillation frequency is proportional to the microscopic tunneling rate of each condensate through the barriers, and provides a direct measurement of the Josephson critical current as a function of the intermediate barrier heights. Our superfluid array may allow investigation of phenomena so far inaccessible to superconducting Josephson junctions and lays a bridge between the condensate dynamics and the physics of discrete nonlinear media.

F. S. Cataliotti; S. Burger; C. Fort; P. Maddaloni; F. Minardi; A. Trombettoni; A. Smerzi; M. Inguscio

2001-08-07T23:59:59.000Z