Sample records for junction compressor station

  1. Computational Optimization of Gas Compressor Stations: MINLP ...

    E-Print Network [OSTI]

    Daniel Rose

    2015-02-26T23:59:59.000Z

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

  2. Control optimization of the cryoplant warm compressor station for EAST

    SciTech Connect (OSTI)

    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

    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.

  3. 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)

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

    2008-02-01T23:59:59.000Z

    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.

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

    Gasoline and Diesel Fuel Update (EIA)

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for On-Highway4,1,50022,3,,,,6,1,9,1,50022,3,,,,6,1,Decade1 Source: Office of FossilFoot)Feet) Year Jan FebYearCompressor

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

    E-Print Network [OSTI]

    Weinert, Jonathan X.; Lipman, Timothy

    2006-01-01T23:59:59.000Z

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

  6. Supersonic compressor

    DOE Patents [OSTI]

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

    2008-02-26T23:59:59.000Z

    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.

  7. Market Opportunities for Electric Drive Compressors for Gas Transmission, Storage, and Processing

    E-Print Network [OSTI]

    Parent, L. V.; Ralph, H. D.; Schmeal, W. R.

    for replacement of older gas engines and for new compressor installations. In ozone nonattainment regions, bringing gas compressor stations into compliance with NOx emission regulations is a must. Outside those regions, new electric drives are being considered...

  8. Danfoss Commercial Compressors October 2013 | 2 Inverter compressors

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    #12;Danfoss Commercial Compressors October 2013 | 2 Inverter compressors Geothermal energy taps ideas. Our sustainable solutions. #12;Danfoss Commercial Compressors October 2013 | 3 Content Ways to improve heat pump efficiency : compressor technology focus Efficiency boost in Ground Source Heat Pump

  9. Active compressor engine silencer reduces exhaust noise

    SciTech Connect (OSTI)

    Denenberg, J.N.; Miller, S.K. (Noise Cancellation Technologies, Inc., Stamford, CT (United States)); Jay, M.A. (Walker Noise Cancellation Technologies, Grass Lake, MI (United States))

    1994-01-01T23:59:59.000Z

    An active industrial silencer on a compressor engine at a Tenneco Gas station has reduced low-frequency rumbling' noise by 8 dB during trials while lowering backpressure about 90$. This 8 dB reduction of the piston firing frequency corresponds to a more than 80% decrease in emitted acoustic power. The silencing unit, installed on one of six engines at the station near Eden, N.Y., continues in operation. Based on the results, the manufacturer is identifying additional compressor sites for further tests. This paper reviews this project.

  10. Electrochemical Hydrogen Compressor

    SciTech Connect (OSTI)

    David P. Bloomfield; Brian S. MacKenzie

    2006-05-01T23:59:59.000Z

    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

  11. Recirculating rotary gas compressor

    DOE Patents [OSTI]

    Weinbrecht, J.F.

    1992-02-25T23:59:59.000Z

    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.

  12. Recirculating rotary gas compressor

    DOE Patents [OSTI]

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

    1992-01-01T23:59:59.000Z

    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.

  13. High ratio recirculating gas compressor

    DOE Patents [OSTI]

    Weinbrecht, J.F.

    1989-08-22T23:59:59.000Z

    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.

  14. Supersonic gas compressor

    DOE Patents [OSTI]

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

    2007-11-13T23:59:59.000Z

    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.

  15. Overview of Station Analysis Tools Developed in Support of H2USA

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

    400,000 500,000 600,000 0 10 20 30 40 50 60 70 Compressor Motor Power kW HRS Compressors LH2 Methodology: Assumptions HRSAM estimates the cost of station equipment based on...

  16. HELIUM COMPRESSOR MONITORING SYSTEM Donna Kubik

    E-Print Network [OSTI]

    HELIUM 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 Compressor #1 Connectors Compressor #2 Connectors Compressor #3 Connectors Compressor #4 Connectors

  17. Energy Savings for Centrifugal Compressors

    E-Print Network [OSTI]

    Fisher, D.

    2011-01-01T23:59:59.000Z

    Current design improvements of both the rotating and stationary aerodynamic components of centrifugal compressors can greatly increase the efficiency of vintage machines. A centrifugal compressor built in the 1970's or 1980's might have an external...

  18. Standing wave compressor

    DOE Patents [OSTI]

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

    1991-01-01T23:59:59.000Z

    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.

  19. Compressor surge counter

    DOE Patents [OSTI]

    Castleberry, Kimberly N. (Harriman, TN)

    1983-01-01T23:59:59.000Z

    A surge counter for a rotating compressor is provided which detects surging by monitoring the vibration signal from an accelerometer mounted on the shaft bearing of the compressor. The circuit detects a rapid increase in the amplitude envelope of the vibration signal, e.g., 4 dB or greater in less than one second, which is associated with a surge onset and increments a counter. The circuit is rendered non-responsive for a period of about 5 seconds following the detection which corresponds to the duration of the surge condition. This prevents multiple registration of counts during the surge period due to rapid swings in vibration amplitude during the period.

  20. Light intensity compressor

    DOE Patents [OSTI]

    Rushford, Michael C. (Livermore, CA)

    1990-01-01T23:59:59.000Z

    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.

  1. Power Characteristics of Industrial Air Compressors

    E-Print Network [OSTI]

    Schmidt, C.; Kissock, K.

    The power draw characteristics of air compressors are primarily determined by the type of compressor control and the relationship between the compressor's output capacity and the compressed air demand in the plant. In this paper, we review the most...

  2. 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)...

  3. Josephson junction

    DOE Patents [OSTI]

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

    1995-05-02T23:59:59.000Z

    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.

  4. Conserve Energy by Optimizing Air Compressor System

    E-Print Network [OSTI]

    Williams, V. A.

    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...

  5. Flow and Plate Motion in Compressor Valves

    E-Print Network [OSTI]

    Twente, Universiteit

    Flow and Plate Motion in Compressor Valves #12;Flow and Plate Motion in Compressor Valves R.A. Habing Cover Image: 4-stage reciprocating compressor system, Courtesy of Ariel Corporation Thesis.A. Habing, Enschede, The Netherlands #12;FLOW AND PLATE MOTION IN COMPRESSOR VALVES PROEFSCHRIFT ter

  6. Free piston inertia compressor

    SciTech Connect (OSTI)

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

    1981-12-29T23:59:59.000Z

    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.

  7. Dual capacity reciprocating compressor

    DOE Patents [OSTI]

    Wolfe, R.W.

    1984-10-30T23:59:59.000Z

    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.

  8. Dual capacity reciprocating compressor

    DOE Patents [OSTI]

    Wolfe, Robert W. (Wilkinsburg, PA)

    1984-01-01T23:59:59.000Z

    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.

  9. Linear Gain for the Microbunching Instability in an RF Compressor

    E-Print Network [OSTI]

    Venturini, M.

    2010-01-01T23:59:59.000Z

    Instability in an RF Compressor M. Venturini Lawrencefor investigating this instability in rf compressors. We useapplied to magnetic compressors [2, 3] and derive some

  10. Multi-Stage Bunch Compressors for the International Linear Collider

    E-Print Network [OSTI]

    Tenenbaum, Peter G.; Raubenheimer, Tor O.; Wolski, Andrzej

    2005-01-01T23:59:59.000Z

    150 µm RMS. The multi-stage compressors are somewhat longerthan the single-stage compressor and require additional RFof the NLC Bunch Compressor,” (1999). [4] C. Adolphsen,

  11. Suction muffler for refrigeration compressor

    DOE Patents [OSTI]

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

    1983-01-25T23:59:59.000Z

    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.

  12. Suction muffler for refrigeration compressor

    DOE Patents [OSTI]

    Nelson, Richard T. (Worthington, OH); Middleton, Marc G. (West Jefferson, OH)

    1983-01-01T23:59:59.000Z

    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.

  13. Semi-active compressor valve

    DOE Patents [OSTI]

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

    2010-07-27T23:59:59.000Z

    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.

  14. Compressor bleed cooling fluid feed system

    DOE Patents [OSTI]

    Donahoo, Eric E; Ross, Christopher W

    2014-11-25T23:59:59.000Z

    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.

  15. Unwinding the Spin on Variable Speed Drive Air Compressors

    E-Print Network [OSTI]

    Beals, C. E.

    2006-01-01T23:59:59.000Z

    Unwinding the Spin on Variable Speed Drive Air Compressors By Chris E. Beals, President, Air System Management, Inc Over the past several years, the variable speed drive (VSD) compressor has become a frequent choice for new compressor... purchases. The VSD compressor’s popularity is partly due to rising energy prices and its efficiency as a trim compressor. Unfortunately, much of the VSD compressor’s popularity is a result of spin applied by the marketers. For example, sales...

  16. The State of the Industrial Compressor Market

    E-Print Network [OSTI]

    Perry, W.

    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...

  17. Economics of Electric Compressors for Gas Transmission

    E-Print Network [OSTI]

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

    Three new factors are coming together to motivate gas pipeline firms to consider electric motors for replacement of older reciprocating gas engines for compressor systems, and for new compressor installations. These factors are environmental...

  18. The State of the Industrial Compressor Market 

    E-Print Network [OSTI]

    Perry, W.

    1998-01-01T23:59:59.000Z

    Pneumatic, Worthington and Kellogg, to name a few) are gone. With Ingersoll-Rand's recent departure, Gardner Denver is the only U.S. company that manufactures an industrial, double-acting, reciprocating compressor. The dynamic compressor manufacturers face a...

  19. Optimization of compression and storage requirements at hydrogen refueling stations.

    SciTech Connect (OSTI)

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

    2008-01-01T23:59:59.000Z

    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.

  20. Water injected fuel cell system compressor

    DOE Patents [OSTI]

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

    2001-01-01T23:59:59.000Z

    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.

  1. The Compressor: Concurrent, Incremental, and Parallel Compaction

    E-Print Network [OSTI]

    Petrank, Erez

    The Compressor: Concurrent, Incremental, and Parallel Compaction Haim Kermany Erez Petrank Dept non-intrusive compactor is still missing. In this paper we present the Compressor, a novel compaction, thereby allowing acceptable runs on large heaps. Furthermore, the Compressor is the first compactor

  2. Compressor performance, absolutely! M. R. Titchener

    E-Print Network [OSTI]

    Titchener, Mark R.

    Compressor performance, absolutely! M. R. Titchener Dept of CS, U. of Auck., N.Z. (Email: mark the absolute performance of existing string compressors may be measured. Kolmogorov (1958) recognised://tcode.auckland.ac.nz/~corpus has been used to evaluate the `absolute' performance of a series of popular compressors. The results

  3. Multiple volume compressor for hot gas engine

    DOE Patents [OSTI]

    Stotts, Robert E. (Clifton Park, NY)

    1986-01-01T23:59:59.000Z

    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.

  4. XMill: an Efficient Compressor for XML Data Hartmut Liefke \\Lambda

    E-Print Network [OSTI]

    Suciu, Dan

    XMill: an Efficient Compressor for XML Data Hartmut Liefke \\Lambda Univ. of Pennsylvania liefke at roughly the same speed. The compressor, called XMill, incorporates and combines existing compressors of datatype specific compressors for simple data types, and, possibly, user defined compressors

  5. Energy Savings for Centrifugal Compressors 

    E-Print Network [OSTI]

    Fisher, D.

    2011-01-01T23:59:59.000Z

    impeller blades. These blades were most likely riveted to the impeller hub and cover. The interstage, impeller eye and balance piston labyrinth seals were probably a high clearance aluminum design. The compressor may have had a straight radial inlet..., but the blades were welded to the hub and cover. Then, in the 1970?s as manufacturing techniques improved, some impellers were made from two parts. Today, most impellers have the blades integrally machined on a three- or five-axis milling machine...

  6. Oil cooled, hermetic refrigerant compressor

    DOE Patents [OSTI]

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

    1985-01-01T23:59:59.000Z

    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.

  7. Oil cooled, hermetic refrigerant compressor

    DOE Patents [OSTI]

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

    1985-05-14T23:59:59.000Z

    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.

  8. Abschlubericht Mixed Signal Baugruppen 2006/7 Gitarrenverstrker WILDCAT Dynamic Compressor Der WILDCAT Dynamic Compressor

    E-Print Network [OSTI]

    Wichmann, Felix

    Abschlußbericht Mixed Signal Baugruppen 2006/7 Gitarrenverstärker WILDCAT Dynamic Compressor Seite 7-1 Der WILDCAT Dynamic Compressor Von René Fischer, Stefan Straube und Henry Westphal #12;Abschlußbericht Mixed Signal Baugruppen 2006/7 Gitarrenverstärker WILDCAT Dynamic Compressor Seite 7-2 Die Idee

  9. Metering Air Compressor Systems for Efficiency: A Progress Report

    E-Print Network [OSTI]

    Joseph, B.

    2005-01-01T23:59:59.000Z

    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...

  10. Running fermi with one-stage compressor: advantages, layout, performance

    E-Print Network [OSTI]

    Cornacchia, M.; Craievich, P.; Di Mitri, S.; Penco, G.; Venturini, M.; Zholents, A.

    2008-01-01T23:59:59.000Z

    Running FERMI with one-stage compressor: advantages, layout,a lattice with one-stage compressor, it was thought at thetime that the two bunch compressors configuration was still

  11. Digital Dynamic Range Compressor Design--A Tutorial and Analysis

    E-Print Network [OSTI]

    Reiss, Josh

    PAPERS Digital Dynamic Range Compressor Design-- A Tutorial and Analysis DIMITRIOS GIANNOULIS formal knowledge and analysis of compressor design techniques. In this tutorial we describe several different approaches to digital dynamic range compressor design. Digital implementations of several classic

  12. air compressor cylinders: Topics by E-print Network

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

    Rotary Compressor CiteSeer Summary: Compressor is the single largest consumer of primary energy (usually electricity) in an industrial refrigeration system and often become a...

  13. 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...

  14. 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...

  15. Sequential Constant Size Compressors for Reinforcement Learning

    E-Print Network [OSTI]

    Schmidhuber, Juergen

    Sequential Constant Size Compressors for Reinforcement Learning Linus Gissl´en, Matt Luciw, Vincent with this problem: standard RL techniques using as input the hidden layer output of a Sequential Constant-Size Compressor (SCSC). The SCSC takes the form of a sequential Recurrent Auto-Associative Mem- ory, trained

  16. Refrigeration system having standing wave compressor

    DOE Patents [OSTI]

    Lucas, Timothy S. (Glen Allen, VA)

    1992-01-01T23:59:59.000Z

    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.

  17. The Effect of Compressor-Administered Defibrillation on Peri-shock Pauses in a Simulated Cardiac Arrest Scenario

    E-Print Network [OSTI]

    Glick, Joshua; Lehman, Erik; Terndrup, Thomas

    2014-01-01T23:59:59.000Z

    Medicine Glick et al Compressor-Administered Defibrillationesearch The Effect of Compressor-administered Defibrillationor experimental (compressor- administered defibrillation)

  18. Compressor ported shroud for foil bearing cooling

    DOE Patents [OSTI]

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

    2011-08-02T23:59:59.000Z

    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.

  19. Hydrogen refueling station costs in Shanghai

    E-Print Network [OSTI]

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

    2007-01-01T23:59:59.000Z

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

  20. Hydrogen Refueling Station Costs in Shanghai

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

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

  1. Compressor & Steam Turbine Efficiency Improvements & Revamping Opportunities

    E-Print Network [OSTI]

    Hata, S.; Horiba, J.; Sicker, M.

    2011-01-01T23:59:59.000Z

    of the plant and introduce the history of efficiency improvements for compressors and steam turbines in the Petrochemical Industry. Since heat balance configurations affect the plant's steam consumption, the authors will explain several cases of heat balance...

  2. A methodology for centrifugal compressor stability prediction

    E-Print Network [OSTI]

    Benneke, Björn

    2009-01-01T23:59:59.000Z

    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, ...

  3. Compressor & Steam Turbine Efficiency Improvements & Revamping Opportunities 

    E-Print Network [OSTI]

    Hata, S.; Horiba, J.; Sicker, M.

    2011-01-01T23:59:59.000Z

    of the plant and introduce the history of efficiency improvements for compressors and steam turbines in the Petrochemical Industry. Since heat balance configurations affect the plant's steam consumption, the authors will explain several cases of heat balance...

  4. Improved return passages for multistage centrifugal compressors

    E-Print Network [OSTI]

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

    2010-01-01T23:59:59.000Z

    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 ...

  5. Method and apparatus for starting supersonic compressors

    DOE Patents [OSTI]

    Lawlor, Shawn P

    2013-08-06T23:59:59.000Z

    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.

  6. Probabilistic aerothermal design of compressor airfoils

    E-Print Network [OSTI]

    Garzón, Víctor E., 1972-

    2003-01-01T23:59:59.000Z

    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 ...

  7. Hydrogen pipeline compressors annual progress report.

    SciTech Connect (OSTI)

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

    2011-07-15T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Lipman, T E; Weinert, Jonathan X.

    2006-01-01T23:59:59.000Z

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

  9. Three-junction solar cell

    DOE Patents [OSTI]

    Ludowise, Michael J. (Cupertino, CA)

    1986-01-01T23:59:59.000Z

    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.

  10. Considerations in Dealing with the Risk of a Compressor Failure

    E-Print Network [OSTI]

    Beals, C. E.

    2007-01-01T23:59:59.000Z

    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...

  11. Impact of geometric variability on compressor repeating-stage performance

    E-Print Network [OSTI]

    Vincent, Antoine, 1979-

    2003-01-01T23:59:59.000Z

    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 ...

  12. Development of a body force model for centrifugal compressors

    E-Print Network [OSTI]

    Kottapalli, Anjaney Pramod

    2013-01-01T23:59:59.000Z

    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 ...

  13. Aerodynamic performance measurements in a counter-rotating aspirated compressor

    E-Print Network [OSTI]

    Onnée, Jean-François

    2005-01-01T23:59:59.000Z

    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 ...

  14. A Transonic Axial Compressor Facility for Fundamental Research

    E-Print Network [OSTI]

    Morris, Scott C.

    A Transonic Axial Compressor Facility for Fundamental Research and Flow Control Development Joshua, IN, 46556, USA A single-stage transonic axial compressor facility has been constructed in the the current generation of aero-gas turbine engines. The compressor stage and facility were designed

  15. CONTROL OF THE THREE STATE MOORE-GREITZER COMPRESSOR MODEL

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    CONTROL OF THE THREE STATE MOORE-GREITZER COMPRESSOR MODEL USING A CLOSE-COUPLED VALVE Jan Tommy system. A Moore- Greitzer model is presented for the compressor and the valve. The valve modi es. Introduction If the ow through a compressor is throttled to the surge- line, the ow becomes unstable

  16. Scroll compressor modelling for heat pumps using hydrocarbons as refrigerants

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Scroll compressor modelling for heat pumps using hydrocarbons as refrigerants Paul BYRNE prototype working with a scroll compressor was built and tested. A near-industrial prototype is today being regarding hydrocarbons as refrigerants, this article reviews scroll compressor modelling studies

  17. Drive torque actuation in active surge control of centrifugal compressors

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Drive torque actuation in active surge control of centrifugal compressors Jan Tommy Gravdahl , Olav to active surge control is presented for a centrifugal compressor driven by an electrical motor. The main is considered to be the control input. The proposed method is simulated on a compressor model using

  18. A Simple and Fast DNA Compressor Giovanni Manzini

    E-Print Network [OSTI]

    Manzini, Giovanni

    A Simple and Fast DNA Compressor Giovanni Manzini Marcella Rastero February 17, 2004 Abstract. For this reason most DNA compressors work by searching and encoding approximate repeats. We depart from to the best DNA compressors. Another important feature of our algorithm is its small space occupancy which

  19. Active surge control of centrifugal compressors using drive torque

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Active surge control of centrifugal compressors using drive torque Jan Tommy Gravdahl , Olav control is presented. A centrifugal compressor driven by an electrical motor is studied, and the drive of the drive as control ensures exponential convergence. The proposed method is simulated on a compressor model

  20. Bunch Compressor for small Emittances and high Peak Currents

    E-Print Network [OSTI]

    Bunch Compressor for small Emittances and high Peak Currents the VUV Free­Electron Laser Frank Stulle University Hamburg #12; #12; Bunch Compressor for small Emittances and high Peak Currents the VUV longitudinally in two magnetic chicanes. first chicane modified version bunch compressor (BC2) which TTF1

  1. Probabilistic Aerothermal Design of Compressor Airfoils Victor E. Garzon

    E-Print Network [OSTI]

    Peraire, Jaime

    Probabilistic Aerothermal Design of Compressor Airfoils by Victor E. Garzon B.S., University Aerothermal Design of Compressor Airfoils by Victor E. Garzon Submitted to the Department of Aeronautics- machinery airfoils, little is known in detail about its impact on aerothermal compressor performance

  2. Most BurrowsWheeler Based Compressors are Not Optimal

    E-Print Network [OSTI]

    Kaplan, Haim

    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

  3. Modeling and Control of Surge and Rotating Stall in Compressors

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Modeling 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 Moore­constant compressor speed is derived by extending the Moore­Greitzer model. Rotating stall and surge is studied

  4. Firewall Compressor: An Algorithm for Minimizing Firewall Policies

    E-Print Network [OSTI]

    Firewall Compressor: An Algorithm for Minimizing Firewall Policies Alex X. Liu Eric Torng Chad and throughput. In this paper, we propose Firewall Compressor, a framework that can significantly reduce-dimensional firewalls. Last, we conducted extensive experiments to evaluate Firewall Compressor. In terms

  5. Coherence Progress: A Measure of Interestingness Based on Fixed Compressors

    E-Print Network [OSTI]

    Schmidhuber, Juergen

    Coherence 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 and the ability of the compressor to learn from observations. Coherence progress considers the increase

  6. Applications of a Turbomachinery Design Tool for Compressors and Turbines

    E-Print Network [OSTI]

    Cincinnati, University of

    Applications of a Turbomachinery Design Tool for Compressors and Turbines Mark G. Turner University-AXI, is briefly described and demonstrated for applications of a two stage compressor and a three stage turbine web sites. The design system can be used to design multistage compressors and turbines from a small

  7. Energy Efficient Implementation of Parallel CMOS Multipliers with Improved Compressors

    E-Print Network [OSTI]

    California at Davis, University of

    Energy Efficient Implementation of Parallel CMOS Multipliers with Improved Compressors Dursun Baran targets. In addition, novel 3:2 and 4:2 compressors are pre- sented to save energy at the same target delay. The proposed compressors provide up to 20% energy reduction depending on the target delay at 65nm

  8. FEASIBILITY OF SOLAR-FIRED, COMPRESSOR-ASSISTED

    E-Print Network [OSTI]

    FEASIBILITY OF SOLAR-FIRED, COMPRESSOR-ASSISTED ABSORPTION CHILLERS Prepared For: California Energy REPORT (FAR) FEASIBILITY OF SOLAR FIRED, COMPRESSOR ASSISTED ABSORPTION CHILLERS EISG AWARDEE Bergquam 1 Feasibility Of Solar Fired, Compressor Assisted Absorption Chillers EISG Grant # 99-15 Awardee

  9. Introducing Back-up to Active Compressor Surge Control System

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Introducing 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 surge control is a promising method for extending the compressor map towards and into the unstable area

  10. Modeling and Control of Surge and Rotating Stall in Compressors

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Modeling 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-constant compressor speed is derived by extending the Moore-Greitzer model. Rotating stall and surge is studied

  11. Method and apparatus for starting supersonic compressors

    DOE Patents [OSTI]

    Lawlor, Shawn P. (Bellevue, WA)

    2012-04-10T23:59:59.000Z

    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.

  12. LNG to CNG refueling stations

    SciTech Connect (OSTI)

    Branson, J.D. [ECOGAS Corp., Austin, TX (United States)

    1995-12-31T23:59:59.000Z

    While the fleet operator is concerned about the environment, he or she is going to make the choice based primarily on economics. Which fuel provides the lowest total operating cost? The calculation of this costing must include the price-per-gallon of the fuel delivered, as well as the tangible and intangible components of fuel delivery, such as downtime for vehicles during the refueling process, idle time for drivers during refueling, emissions costings resulting from compressor oil blow-by, inclusion of non-combustible constituents in the CNG, and energy consumption during the refueling process. Also, the upfront capital requirement of similar delivery capabilities must be compared. The use of LNG as the base resource for the delivered CNG, in conjunction with the utilization of a fully temperature-compressed LNG/CNG refueling system, eliminates many of the perceived shortfalls of CNG. An LNG/CNG refueling center designed to match the capabilities of the compressor-based station will have approximately the same initial capital requirement. However, because it derives its CNG sales product from the {minus}260 F LNG base product, thus availing itself of the natural physical properties of the cryogenic product, all other economic elements of the system favor the LNG/CNG product.

  13. Master Control of Multiple Air Compressors

    E-Print Network [OSTI]

    Petzold, M. A.

    1983-01-01T23:59:59.000Z

    of air compressors in the most efficient manner for any air demand. This system can be further enhanced by the addition of a remote set point signal based on air-flow. This signal is calibrated to reduce the set-point during periods of low demand when...

  14. Cycling Losses During Screw Air Compressor Operation

    E-Print Network [OSTI]

    Maxwell, J. B.; Wheeler, G.; Bushnell, D.

    , the study revealed compressors with cycling controls require as much as 10-25 % more power than is normally assumed when cycle times decrease below 2 minutes. This short cycle time is common in industrial environments. The study also found that combined...

  15. Compression station key to Texas pipeline project

    SciTech Connect (OSTI)

    NONE

    1996-10-01T23:59:59.000Z

    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.

  16. Two results on compressor surge control with disturbance rejection Jan Tommy Gravdahl and Olav Egeland

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Two results on compressor surge control with disturbance rejection Jan Tommy Gravdahl and Olav on nonlinear compressor control where feedback is used to stabilize the compressor to the left of the surge oscillation of the ow through the compressor, and is characterized by a limit oscillation in the compressor

  17. Refrigerator with a clearance seal compressor

    SciTech Connect (OSTI)

    Holland, N. J.

    1985-09-10T23:59:59.000Z

    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.

  18. Combined cold compressor/ejector helium refrigerator

    DOE Patents [OSTI]

    Brown, D.P.

    1984-06-05T23:59:59.000Z

    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.

  19. Combined cold compressor/ejector helium refrigerator

    DOE Patents [OSTI]

    Brown, Donald P. (Southold, NY)

    1985-01-01T23:59:59.000Z

    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.

  20. Analysis and developpment of a Turbivo compressor for MRV applications

    E-Print Network [OSTI]

    Ksayer, Elias Boulawz

    2010-01-01T23:59:59.000Z

    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.

  1. Analysis and developpment of a Turbivo compressor for MRV applications

    E-Print Network [OSTI]

    Elias Boulawz Ksayer; Denis Clodic

    2010-08-12T23:59:59.000Z

    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.

  2. METAL HYDRIDE HYDROGEN COMPRESSORS: A REVIEW

    SciTech Connect (OSTI)

    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

    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.

  3. Development of Inexpensive Turbo Compressor/Expanders for Industrial Use

    E-Print Network [OSTI]

    Jacox, J. W.

    DEVELOPMENT OF INEXPENSIVE TURBO COMPRESSOR/EXPANDERS FOR INDUSTRIAL USE JOHN W. Senior Project Manager NUCON International, Columbus, ABSTRACT Use of Turbo Compressor/Expanders (TCEs) as industrial reversed Brayton Cycle Heat Pumps... offers many technical and energy saving advantages. until recently, such devices have been far too expensive in both capital cost and inefficiency mainly because the compressor and expander stages were built for forward Brayton Cycle operation...

  4. Study of casing treatment effects in axial flow compressors

    E-Print Network [OSTI]

    Schiller, Robert Neil

    1973-01-01T23:59:59.000Z

    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...

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

    E-Print Network [OSTI]

    Hoenninger, Corbett Reed

    2001-01-01T23:59:59.000Z

    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...

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

    E-Print Network [OSTI]

    Demirel, Melik C.

    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 of each ANSYS run included deflection and principle stresses Material for advanced compressor

  7. A Model of Compressor Blade Row Interaction with Shock Induced Vortex Shedding

    E-Print Network [OSTI]

    Cincinnati, University of

    A Model of Compressor Blade Row Interaction with Shock Induced Vortex Shedding Mark G. Turner = circulation = trailing edge thickness = shock angle = density I. Introduction ransonic compressor stages AIAA. Research Scientist, Compressor Aerodynamic Research Laboratory, Associate Fellow AIAA

  8. Dynamics of Longitudinal Phase-Space Modulations in an rf Compressor for Electron Beams

    E-Print Network [OSTI]

    Venturini, M.

    2010-01-01T23:59:59.000Z

    gain along the rf compressor for perturbation wavelengths (drift followed by a 3 m rf compressor. The beam injected atat the exit of the compressor over a range of perturbation

  9. adiabatic toroidal compressors: Topics by E-print Network

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

    troubles. Zhaohui Wei; Mingsheng Ying 2007-01-19 12 Performance investigation of a turbocharger compressor. Open Access Theses and Dissertations Summary: ??ENGLISH ABSTRACT:...

  10. Compressor and Chicane Radiation Studies at the ATF

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

    * Light sources and advanced accelerators short beams - Velocity bunching, chicane compressors - Diagnosis of compressed beams (sub-mm) on a real-time basis * Study radiative...

  11. Compressor and Chicane Radiation Studies at the ATF

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

    (space charge -> coherent radiation) - May greatly impact performance of future compressors and FELs (e.g. microbunching instability) - Use CER as non-destructive bunch length...

  12. Critical speed measurements in the Tevatron cold compressors

    SciTech Connect (OSTI)

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

    2006-01-01T23:59:59.000Z

    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.

  13. Running fermi with one-stage compressor: advantages, layout, performance

    E-Print Network [OSTI]

    Cornacchia, M.; Craievich, P.; Di Mitri, S.; Penco, G.; Venturini, M.; Zholents, A.

    2008-01-01T23:59:59.000Z

    Running FERMI with one-stage compressor: advantages, layout,re-examines the option of running the FERMI FEL driver with

  14. Small core axial compressors for high efficiency jet aircraft

    E-Print Network [OSTI]

    DiOrio, Austin Graf

    2012-01-01T23:59:59.000Z

    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 ...

  15. Electron transport in normal-metal/superconductor junctions

    E-Print Network [OSTI]

    Yan, XZ; Zhao, HW; Hu, Chia-Ren.

    2000-01-01T23:59:59.000Z

    junction, the electron PRB 610163-1829/2000/61~21!/14759~6!/$15.00 l?superconductor junctions g Yan , College Station, Texas 77843-4242 , P.O. Box 603, Beijing 100080, China d Chia-Ren Hu , College Station, Texas 77843-4242 y 2000! systems, we...tanh@~v1eVs3!/2kBT#~L10 2L20 !, PRB 61ZHAO, AND CHIA-REN HU R f5tanh~v/2kBT !~R10 2R20 !, L1 0 5L 2 0? 5L0~k ,v1eVs31i0 !, R1 0 5R 2 0? 5R0~k ,v1i0 !. Here L1 0 and R1 0 (L 2 0 and R 2 0 ) are the retarded ~advanced! Green...

  16. Nanopillar Spin Filter Tunnel Junctions with Manganite Barriers

    E-Print Network [OSTI]

    Prasad, Bhagwati; Egilmez, Mehmet; Schoofs, Frank; Fix, Thomas; Vickers, Mary E; Zhang, Wenrui; Jian, Jie; Wang, Haiyan; Blamire, Mark G

    2014-04-17T23:59:59.000Z

    of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK ‡ Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas, 77843-3128, USA KEYWORDS: Spin filter, Nano... magnetic memories, reprogrammable logic and quantum computers.1,2 These devices rely on the generation of highly spin-polarized currents. Spin filter tunnel junction (SFTJ) has emerged as a promising alternative for this purpose. A possible way...

  17. Bond Graph Modeling of Centrifugal Compressor System Nur Uddin and Jan Tommy Gravdahl

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Bond Graph Modeling of Centrifugal Compressor System Nur Uddin and Jan Tommy Gravdahl Dept, Norway N-7491 nur.uddin@itk.ntnu.no, Jan.Tommy.Gravdahl@itk.ntnu.no Keywords: Compressor, compressor. A model of a compression system with recycle flow is derived in this work. 1. INTRODUCTION Compressors

  18. High Fidelity Modeling of Blade Row Interaction in a Transonic Compressor

    E-Print Network [OSTI]

    Cincinnati, University of

    High Fidelity Modeling of Blade Row Interaction in a Transonic Compressor Michael G. List in a transonic compressor, a time-accurate simulation of a transonic compressor rig was developed. Initially on the compressor. Three dierent axial spacings between the rotor and the upstream blade row have been simulated

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

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    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 compressor surge has been avoided using surge avoidance schemes that use various techniques to keep

  20. A COMPRESSOR SURGE CONTROL SYSTEM: COMBINATION ACTIVE SURGE CONTROL SYSTEM AND SURGE AVOIDANCE SYSTEM

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    A COMPRESSOR SURGE CONTROL SYSTEM: COMBINATION ACTIVE SURGE CONTROL SYSTEM AND SURGE AVOIDANCE- trifugal compressor is presented. ASCS is a promising method to improve compressor operating area by stabilizing surge. However, this method is not applied yet in industrial compressors. Safety issue

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

    E-Print Network [OSTI]

    Carver, Jeffrey C.

    NOISE CONTROL METHODS FOR A RECIPROCATING AIR COMPRESSOR USED IN FUEL CELL AUXILIARY POWER UNIT of Structural Acoustics Laboratory (STAL) Why Target Compressor Noise? Noise reduction in compressor Objective & Water Heat Fuel Processor Fuel cell stack d.c. power Power inverter Fuel Compressor H2 Air Blower a

  2. High Speed Compressors P.B. Bailey, M. W. Dadd, C. R. Stone.

    E-Print Network [OSTI]

    1 High Speed Compressors P.B. Bailey, M. W. Dadd, C. R. Stone. Oxford University, Department compressors with a high power density, and one method of achieving this is to increase the operating frequency of the compressor. The `Oxford' type clearance seal/flexure bearing compressors are typically operated close

  3. Improvement of Compressor Concentricity for the Elimination of Labyrinth Seal Interference

    E-Print Network [OSTI]

    Demirel, Melik C.

    Improvement of Compressor Concentricity for the Elimination of Labyrinth Seal Interference Project compressors to increase efficiency. These compressors are often used in coal power plants to sequester CO2 which can take up to 12% of the total power plant output. Improving efficiency on theses compressors

  4. Junction Plasmon-Induced Molecular Reorientation. | EMSL

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

    Junction Plasmon-Induced Molecular Reorientation. Junction Plasmon-Induced Molecular Reorientation. Abstract: Time and frequency dependent intensity variations in sequences of...

  5. Energy conversion using thermal transpiration : optimization of a Knudsen compressor

    E-Print Network [OSTI]

    Klein, Toby A. (Toby Anna)

    2012-01-01T23:59:59.000Z

    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 ...

  6. Tracer-dilution method indicates flowrate through compressor

    SciTech Connect (OSTI)

    Lagus, P.L.; Flanagan, B.S. (Lagus Applied Technology Inc., San Diego, CA (US)); Peterson, M.E. (Tennessee Gas Pipeline Co., Middleton, TN (US)); Clowney, S.L. (Tenneco Gas, Houston, TX (US))

    1991-02-25T23:59:59.000Z

    A technique for measuring compressor flowrate through an operating natural-gas centrifugal compressor has been tested and found to have a precisions approaching {plus minus}1.5%. The technique employs constant-flow tracer dilution. Testing demonstrated that use of a critical-flow nozzle to inject a constant, known flow of tracer into a flowing natural-gas stream is feasible. Effects of potential pulsation on a tracer flow measurement appear to be eliminated by this technique. With experimental and operational streamlining, the constant-flow tracer dilution technique is capable of being used to measure the flowrate through operating centrifugal compressors with sufficient precisions and accuracy to allow compressor operating characteristics to be determined. This technique is especially useful in situations in which an orifice-flow measurement cannot be performed because of physical space limits or economic considerations.

  7. Fact Sheet: Efficiency Standards for Natural Gas Compressors...

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

    exist in the market today with varying efficiency levels; this is true for the compressors themselves and for the engines or turbines that drive them. DOE plans to examine...

  8. Non-intrusive fault detection in reciprocating compressors

    E-Print Network [OSTI]

    Schantz, Christopher James

    2011-01-01T23:59:59.000Z

    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 ...

  9. An investigation of real gas effects in supercritical CO? compressors

    E-Print Network [OSTI]

    Baltadjiev, Nikola D. (Nikola Dimitrov)

    2012-01-01T23:59:59.000Z

    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 ...

  10. Characterization of unsteady flow processes in a centrifugal compressor stage

    E-Print Network [OSTI]

    Gould, Kenneth A. (Kenneth Arthur)

    2006-01-01T23:59:59.000Z

    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 ...

  11. Centrifugal compressor return channel shape optimization using adjoint method

    E-Print Network [OSTI]

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

    2013-01-01T23:59:59.000Z

    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 ...

  12. Compensating effect of the coherent synchrotron radiation in bunch compressors

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

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

    2013-06-01T23:59:59.000Z

    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.

  13. Multi-parameter control for centrifugal compressor performance optimization

    E-Print Network [OSTI]

    Mannai, Sébastien (Sébastien Karim)

    2014-01-01T23:59:59.000Z

    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 ...

  14. Forced response predictions in modern centrifugal compressor design

    E-Print Network [OSTI]

    Smythe, Caitlin J. (Caitlin Jeanne)

    2005-01-01T23:59:59.000Z

    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 ...

  15. ADVANCED COMPRESSOR ENGINE CONTROLS TO ENHANCE OPERATION, RELIABILITY AND INTEGRITY

    SciTech Connect (OSTI)

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

    2004-03-01T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Kawamura, K.; Apaloo, Thomas-L.

    SCREW TYPE STEAM COMPRESSORS FOR MECHANICAL VAPOR RECOMPRESSION (MVR) SYSTEMS K. KAWAMURA AND THOMAS-L. APALOO MYCOM CORPORATION, LOS ANGELES, CALIFORNIA MATSUDA, MAYEKAWA MFG. CO., TOKYO, JAPAN ABSTRACT In processes of evaporation... 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...

  17. A method of predicting surge in centrifugal compressors

    E-Print Network [OSTI]

    Elchuri, Vijayvardhan

    1975-01-01T23:59:59.000Z

    A METHOD OF PREDICTING SURGE IN CENTRIFUGAL COMPRESSORS A Thesis by VIJAYVARDHAN FLCHURI Submitted to the Graduate College of Texas A6? University in nartial fulfillment of the requirement for the degree of MASTER OF SCIENCE December 1975... Major Subject Mechanical Enpineerinp A METHOD OF PREDICTING SURGE IN CENTRIFUGAL COMPRESSORS A Thesis by VIJAYVARDHAN ELCHURI Approved as to style and content by: Chairman o Committee Hea o partment Mem er m er Mem er I , 0, em er Mem er...

  18. Hyper dispersion pulse compressor for chirped pulse amplification systems

    DOE Patents [OSTI]

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

    2011-11-29T23:59:59.000Z

    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.

  19. An Audio Compressor/Peak Limiter Circuit -Part III The object of this lab is to test your compressor/limiter with a "real-world" audio signal.

    E-Print Network [OSTI]

    Leach Jr.,W. Marshall

    An Audio Compressor/Peak Limiter Circuit - Part III The object of this lab is to test your compressor/limiter with a "real-world" audio signal. Allen Robinson has set up a microphone the oscilloscope. · Verify that your compressor is working before doing the following steps. · Connect the output

  20. Josephson junction Q-spoiler

    DOE Patents [OSTI]

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

    1986-03-25T23:59:59.000Z

    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.

  1. Josephson junction Q-spoiler

    DOE Patents [OSTI]

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

    1988-01-01T23:59:59.000Z

    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.

  2. Downhole steam generator having a downhole oxidant compressor

    DOE Patents [OSTI]

    Fox, Ronald L. (Albuquerque, NM)

    1983-01-01T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Parker, David V. (David Vickery)

    2005-01-01T23:59:59.000Z

    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. ...

  4. Analysis of Short-Bunch Production with the APS Booster and a Bunch Compressor

    E-Print Network [OSTI]

    Kemner, Ken

    Analysis of Short-Bunch Production with the APS Booster and a Bunch Compressor Michael Borland, AOD relatively short, then compressing it with a magnetic bunch compressor. In this note, we present

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

    E-Print Network [OSTI]

    Bert, Jérôme

    2006-01-01T23:59:59.000Z

    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, ...

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

    E-Print Network [OSTI]

    Lei, Vai-Man

    2006-01-01T23:59:59.000Z

    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, ...

  7. Noise Reduction of Centrifugal Compressors using Array of Quarter Wavelength Resonators

    E-Print Network [OSTI]

    Ye, Nan

    2014-07-31T23:59:59.000Z

    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...

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

    SciTech Connect (OSTI)

    Wright, Steven A.; Fuller, Robert L.

    2013-03-19T23:59:59.000Z

    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.

  9. Development of an Electrochemical Separator and Compressor

    SciTech Connect (OSTI)

    Trent Molter

    2011-04-28T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Meher-Homji, C. B.

    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... deposits on the blading resulting in severe performance decrements. This is a common operating problem experienced by almost all operators of gas turbines. The effect of compressor fouling is a drop in airflow and a drop in compressor isentropic...

  11. Towards development of an incipient surge detection device for centrifugal compressors 

    E-Print Network [OSTI]

    Hassinger, David Alan

    1978-01-01T23:59:59.000Z

    OF FIGURES Page 10 12 13 14 Typical Compressor Performance Nap. Centrifugal Compressor Components. Variation of Lift Coefficient due to Changing Angle of Incidence. Inducer Blade Stall. Common Centrifugal Compressor Diffusers Diffuser Vane Stall... within the boundary-layer in the centrifugal compressor diffuser throat. The design of the device will now be expanded upon. Design of Boundary-layer Probe In order to measure the flow within the boundary-layer of the diffuser, a boundary-layer probe...

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

    SciTech Connect (OSTI)

    Rohatgi, Aashish; Johnson, Kenneth I.

    2013-12-01T23:59:59.000Z

    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

  13. INVESTIGATION OF A COMPRESSOR ROTOR NON-SYNCHRONOUS VIBRATION WITH AND WITHOUT FLUID-STRUCTURE INTERACTION

    E-Print Network [OSTI]

    Zha, Gecheng

    INVESTIGATION OF A COMPRESSOR ROTOR NON-SYNCHRONOUS VIBRATION WITH AND WITHOUT FLUID) of a high speed multistage axial compressor using rigid blade and vibrating blade with fluid blades of a high-speed compressor showing the frequency lock-in near the 1st torsional mode (1T) during

  14. inria-00269225,version1-2Apr2008 Using Data Compressors to Construct Rank

    E-Print Network [OSTI]

    Boyer, Edmond

    inria-00269225,version1-2Apr2008 Using Data Compressors to Construct Rank Tests Daniil Ryabko, J compressors. For homogeneity testing the idea is to compress the binary string obtained by ordering the two show that such a test obtained from an ideal data compressor is valid against all alterna- tives

  15. 2009-32-0176/20097176 Miniature HCCI Free-Piston Engine Compressor

    E-Print Network [OSTI]

    Durfee, William K.

    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 of 10 W is needed. To account for compressor and actuator inefficiencies, the power output at the engine

  16. AFRL-AFOSR-UK-TR-2012-0012 High Speed Compressor Study

    E-Print Network [OSTI]

    AFRL-AFOSR-UK-TR-2012-0012 High Speed Compressor Study Charles R. Stone University of Oxford (From ­ To) 1 January 2011 ­ 1 January 2012 4. TITLE AND SUBTITLE High Speed Compressor Study 5a of cryocoolers, with the goal of increasing the power per unit mass (or volume) of cryocooler compressors

  17. Passivity based compressor surge control using a close-coupled valve

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Passivity based compressor surge control using a close-coupled valve Jan Tommy Gravdahl and Olav Passivity-based control of a second order compressor surge model is investi- gated using a close controller for the close- coupled valve. 1 Introduction If the ow through a compressor is throttled

  18. Modeling and Control of a Free Liquid-Piston Engine Compressor

    E-Print Network [OSTI]

    Barth, Eric J.

    Modeling and Control of a Free Liquid-Piston Engine Compressor Chao Yong, Eric J. Barth, José A-piston engine compressor. The dynamic model includes 1) the injection dynamics of the air/fuel mixture, 2 issue, since standard air compressors are too heavy for the intended target scale, as are portable tanks

  19. Optimal Constructions of Fault Tolerant Optical Linear Compressors and Linear Decompressors

    E-Print Network [OSTI]

    Chang, Cheng-Shang

    1 Optimal Constructions of Fault Tolerant Optical Linear Compressors and Linear Decompressors Cheng linear compressors and linear decompressors. The basic network element for our constructions is scaled first obtain a fundamental result on the minimum con- struction complexity of a linear compressor

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

    E-Print Network [OSTI]

    Barth, Eric J.

    Thrust Area 2 Free-Piston Compressor for Portable Fluid-Powered Systems Dr. Eric J. Barth José A Diluted combustion products from previous stroke Combustion gases expand down to Air in compressor chamber begins to pressurize. Combustion products cooled Compressor side pumps to reservoir. Magnet locks free

  1. STUDY OF WORKING FLUID MIXTURES AND HIGH TEMPERATURE WORKING FLUIDS FOR COMPRESSOR DRIVEN SYSTEMS

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    FOR COMPRESSOR DRIVEN SYSTEMS Final Report Part A Prepared by: Thore Berntsson, Chalmers University of Technology for compressor-driven systems", which is Annex VI of the International Energy Agency working group Advanced Heat drops, and realistic compressor efficiencies 40 Physical properties 43 #12;5.3 General parameter study

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

    E-Print Network [OSTI]

    Durfee, William K.

    1 A miniature free-piston engine/compressor Authors: Lei Tian1 , David B Kittelson1 , William K, constructed and evaluated a tiny internal combustion air compressor that uses a free-piston configuration engine. Keywords HCCI, Engine-compressor, Portable power supply, engine modeling, combustion modeling 1

  3. Grism based stretcher/compressor system for amplified, femtosecond kilohertz lasers

    E-Print Network [OSTI]

    Grism based stretcher/compressor system for amplified, femtosecond kilohertz lasers David MHz by using this unique grism stretcher/material compressor in a Ti:sapphire amplifier system based on dovi is accomplished simply by adjusting the separation of the grism-pair. In traditional grating based stretcher/compressor

  4. Bunch compressor BC2 studies V. Balandin, N.Golubeva, 22 October 2005

    E-Print Network [OSTI]

    Bunch compressor BC2 studies V. Balandin, N.Golubeva, 22 October 2005 Goals: beam based checking. It is clear that difference in vertical orbits with bunch compressor on and off (BC2 and BC3) has to be used to remove the large vertical offset and angle at bunch compressor entrance. Since cycling to zero and back

  5. BUNCH COMPRESSOR II AT THE TESLA TEST FACILITY M. Geitz, A. Kabel

    E-Print Network [OSTI]

    BUNCH COMPRESSOR II AT THE TESLA TEST FACILITY M. Geitz, A. Kabel£ , G. Schmidt, H. Weise Deutsches the required peak current. The second stage of the bunch compression sys- tem, bunch compressor II, has been taken into operation recently. We describe design and instrumentation of the bunch compressor II

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

    E-Print Network [OSTI]

    Groppi, Christopher

    EVLA Memo #168 Assessing the Impact of Using Three Cryogenic Compressors on the Performance of four EVLA antennas that have undergone a reconfiguration to use three cryogenic compressors instead in the compressor configuration. The net loss in the sensitivity is # 3.4%, 5.1%, and 2.7% for the S, Ku, and K

  7. Combined Image Compressor and Denoiser based on Tree-adapted Wavelet Shrinkage

    E-Print Network [OSTI]

    Walker, James S.

    Combined Image Compressor and Denoiser based on Tree-adapted Wavelet Shrinkage Revision of OE for enhancing regions-of-interest. Such a full range of features has not been available with previous compressor-Comp is compared with other combined compressor/denoisers, in terms of error reduction and compressed bit

  8. Klystron Instability of a Relativistic Electron Beam in a Bunch Compressor

    E-Print Network [OSTI]

    Klystron Instability of a Relativistic Electron Beam in a Bunch Compressor E.L. Saldina , E passing a magnetic bunch compressor. Analytical expressions are derived for the small-signal gain to Nuclear Instruments and Methods #12;1 Introduction Magnetic bunch compressors are designed to obtain short

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

    E-Print Network [OSTI]

    Groppi, Christopher

    EVLA Memo #168 Assessing the Impact of Using Three Cryogenic Compressors on the Performance of four EVLA antennas that have undergone a reconfiguration to use three cryogenic compressors instead in the compressor configuration. The net loss in the sensitivity is 3.4%, 5.1%, and 2.7% for the S, Ku, and K

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

    E-Print Network [OSTI]

    Burtscher, Martin

    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 for translating user-provided trace descriptions into fast and effective trace compressors. A typical trace

  11. VIBRATION REDUCTION OF A SINGLE CYLINDER RECIPROCATING COMPRESSOR BASED ON MULTI-STAGE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 VIBRATION REDUCTION OF A SINGLE CYLINDER RECIPROCATING COMPRESSOR BASED ON MULTI-STAGE BALANCING, INSA-Lyon, LaMCoS UMR5259, F69621, Villeurbanne, France ** Danfoss Commercial Compressors, F01600, a reciprocating compressor consists of three main mechanical subsets: the hermetic housing, the crankcase

  12. Evolution of pulse shapes during compressor scans in a CPA system and control of electron

    E-Print Network [OSTI]

    Geddes, Cameron Guy Robinson

    Evolution of pulse shapes during compressor scans in a CPA system and control of electron used optical pulse compressor, the grating pair ­ with special emphasis on the pulse skewness and its is the grating pulse compressor. In contrast to the most simplistic view and practice, by scanning the grating

  13. Bunch Compressor for the TESLA Linear Collider W. Decking, G. Hoffstaetter, T. Limberg

    E-Print Network [OSTI]

    Hoffstaetter, Georg

    Bunch Compressor for the TESLA Linear Collider W. Decking, G. Hoffstaetter, T. Limberg DESY compression systems for the TESLA collider. The best alternative is a wiggler type compressor, where we list' R56 = z/: R56 needed = 2 zi - 2 zf f . (2) The basic parameters for the TESLA bunch compressor

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

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    A Moore-Greitzer axial compressor model with spool dynamics. Jan Tommy Gravdahl and Olav Egeland, N-7034 Trondheim, Norway Email: fTommy.Gravdahl,Olav.Egelandg@itk.ntnu.no Abstract The compressor-parameter on the post stall transients of an axial compressor is demonstrated through simulations of a compression

  15. Sensitivity of a Compressor Repeating-Stage to Geometry Jer^ome LAVAINNE

    E-Print Network [OSTI]

    Peraire, Jaime

    Sensitivity of a Compressor Repeating-Stage to Geometry Variation by J´er^ome LAVAINNE Dipl^ome d Students #12;2 #12;Sensitivity of a Compressor Repeating-Stage to Geometry Variation by J´er^ome LAVAINNE and probabilistic sensitivity analyses of an embedded compressor stage perfor- mance to blade geometric variations

  16. A FINITE ELEMENT APPROACH FOR SIMULATING THE QUENCHING OF LARGE ALUMINIUM COMPRESSOR WHEELS

    E-Print Network [OSTI]

    A FINITE ELEMENT APPROACH FOR SIMULATING THE QUENCHING OF LARGE ALUMINIUM COMPRESSOR WHEELS A FINITE ELEMENT APPROACH FOR SIMULATING THE QUENCHING OF LARGE ALUMINIUM COMPRESSOR WHEELS Dirk Büche Aluminum devices such as compressor wheels are typically heat treated in order to achieve the required

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

    E-Print Network [OSTI]

    Barth, Eric J.

    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 is achieved by matching the dynamic load of the compressor to the ideal adiabatic expansion of the hot gas

  18. PhD position: Numerical study on ice accretion on fan blades and compressor stages

    E-Print Network [OSTI]

    Twente, Universiteit

    PhD position: Numerical study on ice accretion on fan blades and compressor stages Within on fan blades and compressor stages. This research is carried out in the framework of the HAIC (High a computational tool to predict the ice accretion on fan blades and the first compressor stages of commercial jet

  19. Multistage Constructions of Linear Compressors, Non-overtaking Delay Lines, and Flexible Delay

    E-Print Network [OSTI]

    Chang, Cheng-Shang

    Multistage Constructions of Linear Compressors, Non-overtaking Delay Lines, and Flexible Delay: linear compressors, non-overtaking delay lines and flexible delay lines. These three types of queues for these three types of queues. Specifically, we develop a two-stage construction of a linear compressor

  20. Investigation of Non-synchronous Vibration Mechanism for a High Speed Axial Compressor Using Delayed DES

    E-Print Network [OSTI]

    Zha, Gecheng

    Investigation of Non-synchronous Vibration Mechanism for a High Speed Axial Compressor Using compressor. DDES is a hybrid model for turbulence simulation, which uses RANS model within the wall boundary of the compressor occurs due to the rotating flow instability in the vicinity of the rotor tip at a stable operation

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

    E-Print Network [OSTI]

    Hauck, Scott

    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

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

    E-Print Network [OSTI]

    Lipman, Timothy; Brooks, Cameron

    2006-01-01T23:59:59.000Z

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

  3. Polyol esters as HFC-134a compressor lubricants

    SciTech Connect (OSTI)

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

    1994-10-01T23:59:59.000Z

    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.

  4. Unwinding the Spin on Variable Speed Drive Air Compressors 

    E-Print Network [OSTI]

    Beals, C. E.

    2006-01-01T23:59:59.000Z

    , such as, “cuts energy costs up to 50%”, “40% reduction in energy costs possible”, “energy savings up to 35%, and “slash power use and reduce life cycle cost savings by 22%”, lead plant personnel to believe that by just installing a VSD compressor... portion of the otor load in the plant. On the other hand, if the cal utility does not have a power factor penalty or e VSD compressor does not constitute a significant ortion of the motor load, then a unity power factor ffers little cost benefit...

  5. An investigation of axial-flow compressor blade treatments

    E-Print Network [OSTI]

    Sangerhausen, Charles Roger

    1974-01-01T23:59:59.000Z

    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...

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

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    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 of the compressor. First a low-order centrifugal compressor model is presented where the states are mass flow

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

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    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

  8. ELECTRICAL ANALOGY MODELLING OF PEFC SYSTEM FED BY A COMPRESSOR

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 PB13-078 ELECTRICAL ANALOGY MODELLING OF PEFC SYSTEM FED BY A COMPRESSOR Moussa Chnani1 , Hattab to be integrated in the simulation of an electrical vehicle power train. As many components have to be modelled by the motor speed. The modelling of the fuel cell electrical response is developed, based on semi

  9. Compressor Selection and Equipment Sizing for Cold Climate Heat Pumps

    SciTech Connect (OSTI)

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

    2014-01-01T23:59:59.000Z

    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.

  10. Gas compressor with side branch absorber for pulsation control

    DOE Patents [OSTI]

    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

    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.

  11. LANSCE | Materials Test Station

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

    Research Facility Training Office Contact Administrative nav background Materials Test Station dotline Testing New Reactor Fuels that Reduce Radioactive Waste Mission Used...

  12. IEMDC -IN-LINE ELECTRIC MOTOR DRIVEN COMPRESSOR

    SciTech Connect (OSTI)

    Michael J. Crowley; Prem N. Bansal; John E. Tessaro

    2004-01-01T23:59:59.000Z

    Dresser-Rand completed the preliminary aerodynamic flowpath of the volute and inlet design for the compressor section. This has resulted in considerable progress being made on the development of the compressor section and ultimately towards the successful integration of the IEMDC System design. Significant effort was put forth in the design of aerodynamic components which resulted in a design that meets the limits of aerodynamically induced radial forces previously established. Substantial effort has begun on the mechanical design of the compressor pressure containing case and other internal components. These efforts show progression towards the successful integration of a centrifugal compressor and variable speed electric motor ventilated by the process gas. All efforts continue to confirm the feasibility of the IEMDC system design. During the third quarter reporting period, the focus was to further refine the motor design and to ensure that the IEMDC rotor system supported on magnetic bearing is in compliance with the critical speed and vibration requirements of the API standards 617 and 541. Consequently specification to design magnetic bearings was developed and an RFQ to three magnetic bearing suppliers was issued. Considerable work was also performed to complete preliminary reports on some of the deliverable tasks under phase 1.0. These include specification for the VFD, RFQ for the magnetic bearings, and preliminary write-up for motor instrumentation and control schematic. In order to estimate motor efficiency at various operating points, plots of calculated motor losses, and motor cooling gas flow rates were also prepared. Preliminary evaluations of motor support concepts were performed via FEA to determine modal frequencies. Presentation was made at DOE Morgantown on August 12, 2003 to provide project status update. Preparations for the IEMDC motor-compressor presentation, at the GMRC conference in Salt Lake City to be held on October 5, 2003, were also started. Detailed calculations of cooling gas flow requirements for the motor and magnetic bearings, per several new operating points designated by DR, confirmed that the required gas flow was within the compressor design guidelines. Previous thrust load calculations had confirmed that the magnetic thrust bearing design load capacity of 6,000 lb. was sufficient to handle the net thrust load produced by the motor and compressor pressure loading. Thus the design data that has been generated, for the variable speed 10 MW 12,000 rpm motor, during the last three quarters, continue to confirm the feasibility of an efficient and robust motor design.

  13. IEMDC IN-LINE ELECTRIC MOTOR DRIVEN COMPRESSOR

    SciTech Connect (OSTI)

    Michael J. Crowley; Prem N. Bansal

    2004-10-01T23:59:59.000Z

    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.

  14. Plasma Switch for High-Power Active Pulse Compressor

    SciTech Connect (OSTI)

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

    2013-11-04T23:59:59.000Z

    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.

  15. RF modulation studies on the S band pulse compressor

    E-Print Network [OSTI]

    Shu, G; Pei, S; Xiao, O

    2015-01-01T23:59:59.000Z

    An S band SLED-type pulse compressor has been manufactured by IHEP to challenge the 100 MW maximum input power, which means the output peak power is about 500 MW at the phase reversal time. In order to deal with the RF breakdown problem, the dual side-wall coupling irises model was used. To further improve the reliability at very high power, amplitude modulation and phase modulation with flat-top output were taken into account. The RF modulation studies on an S-band SLED are presented in this paper. Furthermore, a method is developed by using the CST Microwave Studio transient solver to simulate the time response of the pulse compressor, which can be a verification of the modulate theory. In addition, the experimental setup was constructed and the flat-top output is obtained in the low power tests.

  16. RF modulation studies on the S band pulse compressor

    E-Print Network [OSTI]

    G. Shu; F. Zhao; S. Pei; O. Xiao

    2015-05-28T23:59:59.000Z

    An S band SLED-type pulse compressor has been manufactured by IHEP to challenge the 100 MW maximum input power, which means the output peak power is about 500 MW at the phase reversal time. In order to deal with the RF breakdown problem, the dual side-wall coupling irises model was used. To further improve the reliability at very high power, amplitude modulation and phase modulation with flat-top output were taken into account. The RF modulation studies on an S-band SLED are presented in this paper. Furthermore, a method is developed by using the CST Microwave Studio transient solver to simulate the time response of the pulse compressor, which can be a verification of the modulate theory. In addition, the experimental setup was constructed and the flat-top output is obtained in the low power tests.

  17. Heat powered refrigeration compressor. Semi-annual technical report

    SciTech Connect (OSTI)

    Goad, R.R.

    1981-01-01T23:59:59.000Z

    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.

  18. Turbine inter-disk cavity cooling air compressor

    DOE Patents [OSTI]

    Little, David Allen (Oviedo, FL)

    2001-01-01T23:59:59.000Z

    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.

  19. Downhole steam generator having a downhole oxidant compressor

    DOE Patents [OSTI]

    Fox, R.L.

    1981-01-07T23:59:59.000Z

    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)

  20. Linear Complexity Lossy Compressor for Binary Redundant Memoryless Sources

    E-Print Network [OSTI]

    Mimura, Kazushi

    2011-01-01T23:59:59.000Z

    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.

  1. Turbine inter-disk cavity cooling air compressor

    DOE Patents [OSTI]

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

    1998-01-01T23:59:59.000Z

    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.

  2. Turbine inter-disk cavity cooling air compressor

    DOE Patents [OSTI]

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

    1998-01-06T23:59:59.000Z

    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.

  3. Reducing Air Compressor Work by Using Inlet Air Cooling and Dehumidification

    E-Print Network [OSTI]

    Hardy, Mark James

    2011-02-22T23:59:59.000Z

    Ambient Relative Humidity 20-100% In this study, three separate cases are considered, and a separate model has been developed for each case. The first case serves as a base case to examine the work input of the compressor system without inlet air.... Also, the compressors were modeled as isentropic, which is not representative of an actual case. Future studies can determine the effects of non-isentropic compression and how behavior of real compressors will deviate from the model presented...

  4. To do list for laser maintenance 8.28-8.30 1. Clean the turning box and compressor chamber, remove all broken glass piece on bread board

    E-Print Network [OSTI]

    Shvets, Gennady

    and compressor chamber, remove all broken glass piece on bread board and mirror mount all optics in turning box and compressor chamber, replace all optics with damage spots on it, measure the reflectivity of compressor. 4. Check focal spot

  5. Dual capacity compressor with reversible motor and controls arrangement therefor

    DOE Patents [OSTI]

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

    1980-12-02T23:59:59.000Z

    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.

  6. Role of magnetic anisotropy in spin-filter junctions

    E-Print Network [OSTI]

    Chopdekar, R.V.

    2011-01-01T23:59:59.000Z

    and azimuthal angle for a 2 nm MCO based junction. Figure 1.4 (CCO) or MnCr 2 O 4 (MCO)- both of which are isostructuralin CCO junctions compared to MCO junctions. Detailed studies

  7. 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

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

    E-Print Network [OSTI]

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

    2014-01-01T23:59:59.000Z

    An approach is proposed to determine the optimal air compressor location in a manufacturing facility. The optimization strategy is based on an objective function that minimizes the total energy consumption of the air compressor -thereby decreasing...

  9. EXPERIMENTAL CHARACTERIZATION OF THE TRANSVERSE PHASE SPACE OF A 60-MeV ELECTRON BEAM THROUGH A COMPRESSOR

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    A COMPRESSOR CHICANE F. Zhou, SLAC, Menlo Park, California; R. B. Agustsson, G. Andonian, D. B. Cline, UCLA a magnetic bunch compressor. This paper presents the trans- verse phase-space tomographic measurements

  10. Method for shallow junction formation

    DOE Patents [OSTI]

    Weiner, Kurt H. (San Jose, CA)

    1996-01-01T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

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

    2008-01-01T23:59:59.000Z

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

  12. Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin...

    Office of Scientific and Technical Information (OSTI)

    Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures Citation Details Title: Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin...

  13. adherens junction formation: Topics by E-print Network

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

    of aluminum tunnel junctions Our recent work has involved fabrication of superconducting aluminum tunnel junctions for use; W. Barber et al. 2. PROCEDURE Our tunnel...

  14. Testing and modeling of compressors for low-lift cooling applications

    E-Print Network [OSTI]

    Willingham, Ryan Alexander

    2009-01-01T23:59:59.000Z

    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 ...

  15. 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

  16. Effect of Intake on Compressor Performance | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) 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 Center Home Page onYouTube YouTube Note: Since the YouTube|6721 Federal Register / Vol.6: RecordJune-YearEffect of Intake on Compressor

  17. First Shipment of Compressors Leaves Portsmouth | Department of Energy

    Office of Environmental Management (EM)

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011 Strategic Plan| Departmentof OhioFirst Annual Post CompetitionShipment of Compressors

  18. Skate Station UF Services

    E-Print Network [OSTI]

    Pilyugin, Sergei S.

    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

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

    E-Print Network [OSTI]

    1 Gas Spring Losses in Linear Clearance Seal Compressors P.B. Bailey, M.W. Dadd, J.S. Reed* , C investigations on conventional crank driven reciprocating compressors, where the use of normal sliding seals would minimise seal losses. The widespread use of linear clearance seals in linear compressor has raised

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

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    Test results of performance and oil circulation rate of commercial reciprocating compressors compressors, covering different capacities, displacement, stroke-to-bore ratios and number of cylinders, have to obtain a complete picture on changes on the volumetric efficiency and compressor efficiency amongst

  1. 83-9E9-TOPIC-P3 Unrestricted DOMslon ManagerHIGH-EFFICIENCY DUAL-STROKE COMPRESSOR

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    #12;83-9E9-TOPIC-P3 Unrestricted DOMslon ManagerHIGH-EFFICIENCY DUAL-STROKE COMPRESSOR FOR HEAT&D Center 1310 Beulah Road Pittsburgh, Pennsylvania 15235 #12;HIGH EFFICIENCY DUAL-STROKE COMPRESSOR, two-capacity,.three cylinder, reciprocating piston, hermetic compressor for the advanced electric heat

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

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    Performance analysis of a series of hermetic reciprocating compressors working with R290 (propane Abstract In this paper, a series of compressors with different capacities and geometries working with propane as refrigerant are analyzed in terms of the compressor model developed by [E. Navarro, E. Granryd

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

    E-Print Network [OSTI]

    Barth, Eric J.

    REDUCING PISTON MASS IN A FREE PISTON ENGINE COMPRESSOR BY EXPLOITING THE INERTANCE OF A LIQUID compressor. It is shown that for the size scale targeted, advantageous piston dynamics can be achieved piston also allow for reduced valve sizes for the compressor, creating a more energy-dense device

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

    DOE Patents [OSTI]

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

    2003-04-08T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    2002-01-01T23:59:59.000Z

    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.

  6. Development of a test rig for a helium twin-screw compressor

    SciTech Connect (OSTI)

    Wang, B. M.; Hu, Z. J. [Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 (China); Zhang, P. [School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074 (China); Li, Q. [State Key Laboratory of Technologies in Space Cryogenic Propellant(Institute of Physics and Chemistry, Chinese Academy of Sciences), Beijing 100190 (China)

    2014-01-29T23:59:59.000Z

    A large helium cryogenic system is being developed for use in great science projects, such as the International Thermonuclear Experimental Reactor (ITER), Large Helical Device (LHD), and the Experimental Advanced Superconducting Tokamak (EAST). In this cryogenic system, a twin-screw compressor is a key component. Therefore, it is necessary to obtain the compressor performance. To obtain the performance characteristics, a test rig for the compressor has been built. All the important performance parameters, including adiabatic efficiency, volumetric efficiency, oil injection characteristic, and noise characteristic can be acquired with the rig when sensors are installed in the test system. With the test performance, the helium twin-screw compressor can be evaluated. Using these results, the design of the compressor can be improved.

  7. Hydrogen Filling Station

    SciTech Connect (OSTI)

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

    2010-02-24T23:59:59.000Z

    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:

  8. Detector for flow abnormalities in gaseous diffusion plant compressors

    DOE Patents [OSTI]

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

    1998-01-01T23:59:59.000Z

    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.

  9. Detector for flow abnormalities in gaseous diffusion plant compressors

    DOE Patents [OSTI]

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

    1998-06-16T23:59:59.000Z

    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.

  10. Alternative Fueling Station Locator

    Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

    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 Center Home Page on Delicious Rank EERE: Alternative Fuels Data Center Home PageStation LocationsGeneseeValleyPerformance

  11. Alternative Fueling Station Locator

    Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

    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 Center Home Page on Delicious Rank EERE: Alternative Fuels Data Center Home PageStation LocationsGeneseeValleyPerformance

  12. H2FIRST Reference Station Design Task: Project Deliverable 2...

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

    times the long-term, volume production costs for medium-pressure and high-pressure compressors, respectively. The new compressor cost models used in this HRSAM economic analysis...

  13. Tunnel junction multiple wavelength light-emitting diodes

    DOE Patents [OSTI]

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

    1992-01-01T23:59:59.000Z

    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.

  14. Tunnel junction multiple wavelength light-emitting diodes

    DOE Patents [OSTI]

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

    1992-11-24T23:59:59.000Z

    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.

  15. Thermoelectric efficiency of critical quantum junctions

    E-Print Network [OSTI]

    Mihail Mintchev; Luca Santoni; Paul Sorba

    2013-10-30T23:59:59.000Z

    We derive the efficiency at maximal power of a scale-invariant (critical) quantum junction in exact form. Both Fermi and Bose statistics are considered. We show that time-reversal invariance is spontaneously broken. For fermions we implement a new mechanism for efficiency enhancement above the Curzon-Ahlborn bound, based on a shift of the particle energy in each heat reservoir, proportional to its temperature. In this setting fermionic junctions can even reach at maximal power the Carnot efficiency. The bosonic junctions at maximal power turn out to be less efficient then the fermionic ones.

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

    SciTech Connect (OSTI)

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

    1983-08-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

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

    1981-03-01T23:59:59.000Z

    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.

  18. 241-U-701 new compressor building and instrument air piping analyses

    SciTech Connect (OSTI)

    Huang, F.H.

    1994-08-25T23:59:59.000Z

    Building anchorage analysis is performed to qualify the design of the new compressor building foundation given in the ECN ``241-U-701 New Compressor Building.`` Recommendations for some changes in the ECN are made accordingly. Calculations show that the 6-in.-slab is capable of supporting the pipe supports, and that the building foundation, air compressor and dryer anchorage, and electric rack are adequate structurally. Analysis also shows that the instrument air piping and pipe supports for the compressed air system meet the applicable code requirements and are acceptable. The building is for the U-Farm instrument air systems.

  19. Uniform Conversions of Operating Points and Characteristics of Compressor

    E-Print Network [OSTI]

    Ostromuhov, L A

    2011-01-01T23:59:59.000Z

    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.

  20. Hydraulic accumulator-compressor for geopressured enhanced oil recovery

    DOE Patents [OSTI]

    Goldsberry, Fred L. (Spring, TX)

    1988-01-01T23:59:59.000Z

    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.

  1. Idaho_SheepStation

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh School footballHydrogenIT |Hot Springs Site #0104Sheep Station Site

  2. Transit Infrastructure Finance Through Station Location Auctions

    E-Print Network [OSTI]

    Ian Carlton

    2009-01-01T23:59:59.000Z

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

  3. Multi-junction solar cell device

    DOE Patents [OSTI]

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

    2007-12-18T23:59:59.000Z

    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.

  4. Impact of unsteady flow processes on the performance of a high speed axial flow compressor

    E-Print Network [OSTI]

    Botros, Barbara Brenda

    2008-01-01T23:59:59.000Z

    This thesis examines the unsteady interactions between blade rows in a high Mach number, highly-loaded compressor stage. Two straight vane/rotor configurations with different axial spacing between vane and rotor are ...

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

    E-Print Network [OSTI]

    Walton, Edward James

    2014-01-01T23:59:59.000Z

    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 ...

  6. Demonstration of Natural Gas Engine Driven Air Compressor Technology at Department of Defense Industrial Facilities

    E-Print Network [OSTI]

    Lin, M.; Aylor, S. W.; Van Ormer, H.

    Recent downsizing and consolidation of Department of Defense (DOD) facilities provides an opportunity to upgrade remaining facilities with more efficient and less polluting equipment. Use of air compressors by the DOD is widespread and the variety...

  7. Electrical Power Savings in Pump and Compressor Networks via Load Management

    E-Print Network [OSTI]

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

    2005-01-01T23:59:59.000Z

    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...

  8. Approaches Toward Achieving Optimum Efficiency in Rerates of Large Centrifugal Compressors

    E-Print Network [OSTI]

    Rudisel, D. A.

    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...

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

    E-Print Network [OSTI]

    Hunt, D. G.; Terry, S.

    2014-01-01T23:59:59.000Z

    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...

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

    E-Print Network [OSTI]

    Hickok, H. N.

    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...

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

    E-Print Network [OSTI]

    Villanueva V., Alfonso D. (Villanueva Villarreal)

    2006-01-01T23:59:59.000Z

    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 ...

  12. LS Note 327 - A New Type of Bunch Compressor and Seeding of a...

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

    generation of THz radiation. PACS numbers 41.60.Cr, 42.55.Vc 2 1. Introduction Bunch compressors play an important role in the physics of charged particle beams. Many applications...

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

    E-Print Network [OSTI]

    Hanley, Brian K. (Brian Kyle)

    2010-01-01T23:59:59.000Z

    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. ...

  14. Effects of rotor tip clearance on an embedded compressor stage performance

    E-Print Network [OSTI]

    Sakulkaew, Sitanun

    2012-01-01T23:59:59.000Z

    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 ...

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

    E-Print Network [OSTI]

    Lusardi, Christopher (Christopher Dean)

    2012-01-01T23:59:59.000Z

    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 ...

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

    E-Print Network [OSTI]

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

    1999-01-01T23:59:59.000Z

    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 ...

  17. Effects of upstream wake phasing on the performance of transonic compressors

    E-Print Network [OSTI]

    Nolan, Sean Patrick Rock

    2009-01-01T23:59:59.000Z

    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 ...

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

    E-Print Network [OSTI]

    Castiella Ruiz de Velasco, Juan Carlos, 1978-

    2005-01-01T23:59:59.000Z

    (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 ...

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

    E-Print Network [OSTI]

    Reichstein, Georg A

    2009-01-01T23:59:59.000Z

    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 ...

  20. Towards development of an incipient surge detection device for centrifugal compressors

    E-Print Network [OSTI]

    Hassinger, David Alan

    1978-01-01T23:59:59.000Z

    TOWARDS DEVELOPMENT OF AN INCIPIENT SURGE DETECTION DEVICE FOR CENTRIFUGAL COMPRESSORS A Thesis DAVID ALAN HASSINGER Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirement for the degree of MASTER... OF SCIENCE December 1978 Major Subject: Mechanical Engineering TOWARDS DEVELOPMENT OF AN INCIPIENT SURGE DETECTION DEVICE FOR CENTRIFUGAL COMPRESSORS A Thesis by DAVID ALAN HASSINGER Approved as to style and content by: (Chairman of Committee) (Me...

  1. Investigation of flow in vane-island diffusers in centrifugal compressors

    E-Print Network [OSTI]

    Vandijk, Hanne Nicolaas

    1976-01-01T23:59:59.000Z

    INVESTIGATION OF FLOW IN VANE-ISLAND DIFFUSERS IN CENTRIFUGAL COMPRESSORS A Thesis by HANNE NICOLAAS VANDIJK Submitted to the Graduate College of Texas ASM University 1n partial fulf1llment of the requirement for the degree of MASTER... OF SCIENCE December 1976 Major Subject: Mechan1cal Engineering INVESTIGATION OF FLOW IN VANE-ISLAND DIFFUSERS IN CENTRIFUGAL COMPRESSORS A Thesis by HANNE NICOLAAS VANDIJK Approved as to style and content by: (Chairman of Committee) I (Head...

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

    E-Print Network [OSTI]

    Graves, Rhett David

    2004-09-30T23:59:59.000Z

    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...

  3. New SLED 3 system for Multi-mega Watt RF compressor

    E-Print Network [OSTI]

    Xu, Chen; Tantawi, Sami

    2014-01-01T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Gaul, Christopher J. (Thornton, CO)

    2001-01-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

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

    2014-01-01T23:59:59.000Z

    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%.

  6. Apparatus and methods for cooling and sealing rotary helical screw compressors

    DOE Patents [OSTI]

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

    1997-01-01T23:59:59.000Z

    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.

  7. Apparatus and methods for cooling and sealing rotary helical screw compressors

    DOE Patents [OSTI]

    Fresco, A.N.

    1997-08-05T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    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

    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.

  9. 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....

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

    E-Print Network [OSTI]

    Berlin,Technische Universität

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

  11. Hydrogen vehicle fueling station

    SciTech Connect (OSTI)

    Daney, D.E.; Edeskuty, F.J.; Daugherty, M.A.; Prenger, F.C.; Hill, D.D.

    1995-09-01T23:59:59.000Z

    The authors describe a hydrogen vehicle fueling station that receives and stores hydrogen in liquid form and dispenses it either as a liquid or compressed gas. The economics that accrue from the favorable weight and volume advantages of liquid hydrogen support this concept both now and probably for some time to come. The model for liquid transfer to a 120-liter vehicle tank shows that transfer times under five minutes are feasible with pump-assisted transfer, or for pressure transfer with subcooling greater than 1 K. The model for compressed gas transfer shows that underfilling of nearly 30% can occur during rapid filling. Cooling the fill gas to 214 K completely eliminates underfilling.

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

    E-Print Network [OSTI]

    Johnson, Nils; Yang, Christopher; Ogden, J

    2009-01-01T23:59:59.000Z

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

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

    E-Print Network [OSTI]

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

    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...

  14. Fuel Station Procedure Applicability All

    E-Print Network [OSTI]

    Moore, Paul A.

    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

  15. Junction-side illuminated silicon detector arrays

    DOE Patents [OSTI]

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

    2004-03-30T23:59:59.000Z

    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.

  16. Theory of Proximity Effect in Junctions with Unconventional Superconductors

    E-Print Network [OSTI]

    Fominov, Yakov

    )Singlet superconductor junctions ()Triplet superconductor junctions [PRB 70, 012507 (2004), PRB71 024506(2005) PRB 72,R140503 (2005), PRL 96 (2006) ] [PRB 69 144519 (2004), PRL 90 167003(2003)] #12;Tunneling

  17. 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)

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

    2013-08-01T23:59:59.000Z

    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.

  18. A Lossless Fuzzy Binary AND/OR Compressor

    E-Print Network [OSTI]

    Alipour, Philip B

    2009-01-01T23:59:59.000Z

    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 ...

  19. Complementary junction heterostructure field-effect transistor

    DOE Patents [OSTI]

    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

    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.

  20. Axion physics in a Josephson junction environment

    E-Print Network [OSTI]

    Christian Beck

    2011-11-23T23:59:59.000Z

    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.

  1. Complementary junction heterostructure field-effect transistor

    DOE Patents [OSTI]

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

    1995-12-26T23:59:59.000Z

    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.

  2. 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.

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

    SciTech Connect (OSTI)

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

    2005-02-25T23:59:59.000Z

    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.

  4. Dynamic simulations of arrays of Josephson junctions

    SciTech Connect (OSTI)

    Eikmans, H.; van Himbergen, J.E. (Institute for Theoretical Physics, University of Utrecht, P.O. Box 80.006, 3508 TA Utrecht, The Netherlands (NL))

    1990-05-01T23:59:59.000Z

    First we introduce a very efficient algorithm for dynamic simulations of a wide class of arrays of Josephson junctions with realistic boundaries. With this algorithm one can also represent current-biased arrays with periodic boundaries. Next we present results of extensive simulations of ladder arrays. We evaluate the resistance as a function of magnetic field and find striking differences between different geometries.

  5. Gallium nitride junction field-effect transistor

    DOE Patents [OSTI]

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

    1999-01-01T23:59:59.000Z

    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.

  6. Axion mass estimates from resonant Josephson junctions

    E-Print Network [OSTI]

    Christian Beck

    2014-06-10T23:59:59.000Z

    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.

  7. Gallium nitride junction field-effect transistor

    DOE Patents [OSTI]

    Zolper, J.C.; Shul, R.J.

    1999-02-02T23:59:59.000Z

    An ion implanted gallium-nitride (GaN) junction field-effect transistor (JFET) and method of making the same are disclosed. Also disclosed are various ion implants, both n- and p-type, together with or without phosphorus co-implantation, in selected III-V semiconductor materials. 19 figs.

  8. Hydrogen Refueling Station Costs in Shanghai

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

    04 Hydrogen Refueling Station Costs in Shanghai Jonathan X.Hydrogen Refueling Station Costs in Shanghai Jonathan X.voltage connections) Capital costs for this equipment must

  9. Hydrogen refueling station costs in Shanghai

    E-Print Network [OSTI]

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

    2007-01-01T23:59:59.000Z

    Kingdom; 2004. [8] Amos W. Costs of storing and transportingcon- nections). Capital costs for this equipment must bein an analysis of station costs. Total station construction

  10. Station Footprint: Separation Distances, Storage Options, and...

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

    Station Footprint: Separation Distances, Storage Options, and Pre-Cooling Station Footprint: Separation Distances, Storage Options, and Pre-Cooling This presentation by Aaron...

  11. Stations; A Multimedia Performance for Eight Players

    E-Print Network [OSTI]

    Giracello, Robert Francis

    2010-01-01T23:59:59.000Z

    RIVERSIDE Stations; A Multimedia Performance for EightDISSERTATION Stations; A Multimedia Performance for Eightthe tragic drama in a multimedia theater environment. Table

  12. Energy Department Launches Alternative Fueling Station Locator...

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

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

  13. Hydrogen Refueling Station Costs in Shanghai

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

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

  14. Celilo Converter Station - October 2005

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

    Asbestos has been removed from the station. Old, noisy, maintenance-in- tensive air-cooling has been replaced with an effi - cient, closed loop water-cooled system. Chemical...

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

    E-Print Network [OSTI]

    Li, Perry Y.

    Abstract-- For a Compressed Air Energy Storage (CAES) approach to be viable, the air compressor of the storage energy conversion, it is critical that it is efficient and sufficiently powerful-off between efficiency and power. Most attempts to improve the efficiency or power of the air compressor

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

    E-Print Network [OSTI]

    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,5 compressors 1 purifiers 0 spare 1 compressors 0,5 5 spare 0,5 1,5 1,5 Muon pixel: MFC's + steering units 0

  17. Short pulse laser stretcher-compressor using a single common reflective grating

    DOE Patents [OSTI]

    Erbert, Gaylen V.; Biswal, Subrat; Bartolick, Joseph M.; Stuart, Brent C.; Telford, Steve

    2004-05-25T23:59:59.000Z

    The present invention provides an easily aligned, all-reflective, aberration-free pulse stretcher-compressor in a compact geometry. The stretcher-compressor device is a reflective multi-layer dielectric that can be utilized for high power chirped-pulse amplification material processing applications. A reflective grating element of the device is constructed: 1) to receive a beam for stretching of laser pulses in a beam stretcher beam path and 2) to also receive stretched amplified pulses to be compressed in a compressor beam path through the same (i.e., common) reflective multilayer dielectric diffraction grating. The stretched and compressed pulses are interleaved about the grating element to provide the desired number of passes in each respective beam path in order to achieve the desired results.

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

    SciTech Connect (OSTI)

    McTaggart, Paul

    2004-12-31T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Chen, G.; Beale, W.T.

    1990-04-03T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    1990-01-01T23:59:59.000Z

    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.

  1. An Audio Compressor/Peak Limiter Circuit The object of this experiment is to use the voltage-controlled amplifier designed in the

    E-Print Network [OSTI]

    Leach Jr.,W. Marshall

    An Audio Compressor/Peak Limiter Circuit The object of this experiment is to use the voltage-controlled amplifier designed in the last lab to realize an audio compressor/peak limiter circuit. Such a circuit and a compressor is primarily in the attack and release times of the circuits. A limiter reduces gain quickly when

  2. ACEEE Summer Study on Energy in Industry, West Point, NY, July 19-22. 1 Modeling and Simulation of Air Compressor Energy Use

    E-Print Network [OSTI]

    Kissock, Kelly

    of Air Compressor Energy Use Chris Schmidt, Energy & Resource Solutions, Inc. Kelly Kissock, Department compressor energy use to estimate energy savings in compressed air systems from air use reduction and other changes. The method uses measured power signatures and other compressor parameters as inputs to calculate

  3. ENGI 4421 Term Test 2 2012 06 25 Page 1 of 2 1) A storeroom contains 25 air compressors that were all assembled in the same

    E-Print Network [OSTI]

    George, Glyn

    ENGI 4421 Term Test 2­ 2012 06 25 Page 1 of 2 1) A storeroom contains 25 air compressors that were all assembled in the same production run. It is known that five of those air compressors would fail a quality control test. From the storeroom a random sample of four air compressors is taken and tested. Let

  4. Investigation of subsonic and supersonic flow in a radial inflow compressor

    E-Print Network [OSTI]

    Bale, Yadiyurappa Siddaveerasetty

    1970-01-01T23:59:59.000Z

    . -eut or rche cia~res FLWSTEb. OF SClEXCE Decercber 197O Fi-. jor Sub eeet'c ' echanlc. al Engrreerrccg INVESTIGATION OP SUBSONIC AND SUPERSONIC FLON IN A RADIAL INFLON COMPRESSOR A Thesis by YADIYURAPPA SIDDAVEFFASETTY BALF Approsed as to style...) Yadiyurappa Siddaveerasetty Bale B. E. (Necbanicai. Engineering), Hysore University Directed by: Dr. Nehezwan P. Boyce This report is a f. asibility stuoy of the radial inflow com- pressor. The goaL was to study theoretically the flow in such a compressor...

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

    E-Print Network [OSTI]

    Kong, Lingjie

    2013-01-01T23:59:59.000Z

    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.

  6. Stability analysis and testing of a train of centrifugal compressors for high pressure gas injection

    SciTech Connect (OSTI)

    Memmott, E.A. [Dresser-Rand Co., Olean, NY (United States)

    1999-07-01T23:59:59.000Z

    This paper describes the rotor dynamic stability analysis and the PTC-10 Class 1 test of a three body centrifugal compressor train for high pressure natural gas injection services. This train had a full load full pressure string test on hydrocarbon gases to a final discharge pressure of 500 BAR (7250 PSIA). Each compressor is of the back to back configuration, and is equipped with tilting pad seals, damper bearings, and a honeycomb labyrinth at the division wall with shunt holes. The driver is a gas turbine.

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

    SciTech Connect (OSTI)

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

    2014-01-29T23:59:59.000Z

    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.

  8. Analysis on Achieving a Minimum Bunch Length in LCLS Bunch Compressor One

    SciTech Connect (OSTI)

    Sun, Yipeng; Huang, Zhirong; Ding, Yuantao; Wu, Juhao; /SLAC; ,

    2011-08-19T23:59:59.000Z

    An ultra-short bunch is required by different applications in many aspects. In this paper, the condition to achieve a minimum bunch length at the Linac Coherent Light Source (LCLS) [1] bunch compressor one (BC1) is analyzed analytically and evaluated by simulation. The space charge, wake field and coherent synchrotron radiation (CSR) effects are not discussed here.

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

    E-Print Network [OSTI]

    Gaupp, Andreas

    2013-01-01T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Weichert, Stephanie April

    2012-02-07T23:59:59.000Z

    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...

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

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    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

  12. Reducing Air Compressor Work by Using Inlet Air Cooling and Dehumidification 

    E-Print Network [OSTI]

    Hardy, Mark James

    2011-02-22T23:59:59.000Z

    are sensitive to ambient conditions, as evidenced by the fact that compressing cooler and drier air decreases the amount of work required to compress the air. A thermodynamic model of an air compressor system was developed and several cases were run by using...

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

    E-Print Network [OSTI]

    Meher-Homji, C. B.

    1987-01-01T23:59:59.000Z

    The fouling of axial flow compressors and turbines is a serious operating problem in gas turbine engines. 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...

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

    SciTech Connect (OSTI)

    Huang, H.; Kessler, T.J.

    2007-07-02T23:59:59.000Z

    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.

  15. Fabrication of magnetic tunnel junctions with epitaxial and textured ferromagnetic layers

    DOE Patents [OSTI]

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

    2008-11-11T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    Robert J. McKee

    2003-05-01T23:59:59.000Z

    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.

  17. Single P-N junction tandem photovoltaic device

    DOE Patents [OSTI]

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

    2012-03-06T23:59:59.000Z

    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%.

  18. Single P-N junction tandem photovoltaic device

    DOE Patents [OSTI]

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

    2011-10-18T23:59:59.000Z

    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%.

  19. Investigation of the Wall Effect in the long Josephson junctions

    SciTech Connect (OSTI)

    Nevirkovets, I.P.; Rudenko, E.M. (Inst. of Metal Physics of the Ukrainian Academy of Science, Kiev 252142 (SU))

    1991-03-01T23:59:59.000Z

    This paper reports on the long Josephson junctions with edge current injection and shortened control line studied experimentally. It is found that the wall effect is connected with the blockade of vortices entry into the junction by control current, as well as with the existence of the energy barrier for the vortices at the boundary between a projection region and the remainder part of the junction. The significant enhancement of supercurrent due to the blockade was found.

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

    SciTech Connect (OSTI)

    Rice, C K; Sand, J R

    1993-01-01T23:59:59.000Z

    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.

  1. Raman Scattering at Plasmonic Junctions Shorted by Conductive...

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

    between line spectra and band spectra, can be assigned to shorting the junction plasmon through molecular conductive bridges. This is demonstrated through Raman trajectories...

  2. Quantum manipulation and simulation using Josephson junction arrays

    E-Print Network [OSTI]

    Xingxiang Zhou; Ari Mizel

    2006-05-01T23:59:59.000Z

    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.

  3. NOAA PMEL Station Chemistry Data

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

    Quinn, Patricia

    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.

  4. Mobile Alternative Fueling Station Locator

    SciTech Connect (OSTI)

    Not Available

    2009-04-01T23:59:59.000Z

    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.

  5. LIQUIDSLIQUIDS GISAXSGISAXSGISAXS/WAXS station

    E-Print Network [OSTI]

    Ohta, Shigemi

    Beamline CapabilitiesBeamline Capabilities Sector 12-ID. Poster updated March 2014. #12;LIQUIDSLIQUIDS GISAXSGISAXSGISAXS/WAXS station: * Energy range: 2.1 to 24 keV * Low divergence mode: * Energy range: 6.5 to 24 keV * Beam focus:

  6. Phonon interference effects in molecular junctions

    SciTech Connect (OSTI)

    Markussen, Troels, E-mail: troels.markussen@gmail.com [Center for Atomic-scale Materials Design (CAMD), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby (Denmark)] [Center for Atomic-scale Materials Design (CAMD), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby (Denmark)

    2013-12-28T23:59:59.000Z

    We study coherent phonon transport through organic, ?-conjugated molecules. Using first principles calculations and Green's function methods, we find that the phonon transmission function in cross-conjugated molecules, like meta-connected benzene, exhibits destructive quantum interference features very analogous to those observed theoretically and experimentally for electron transport in similar molecules. The destructive interference features observed in four different cross-conjugated molecules significantly reduce the thermal conductance with respect to linear conjugated analogues. Such control of the thermal conductance by chemical modifications could be important for thermoelectric applications of molecular junctions.

  7. Junction Hilltop Wind | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation, searchOf Kilauea Volcano, Hawaii | WindInformationJosephine,Junction Hilltop

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

    E-Print Network [OSTI]

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

    2010-01-01T23:59:59.000Z

    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

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

    E-Print Network [OSTI]

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

    2014-01-01T23:59:59.000Z

    determines the ideal air compressor horsepower required to meet the facility air demand at the required pressure. Air pressure drops are incorporated using a compressed air pipeline pressure drop table, while air leaks are calculated throughout the system...

  10. Limiting and realistic efficiencies of multi-junction solar Photonic Materials Group, FOM institute AMOLF, Amsterdam

    E-Print Network [OSTI]

    Polman, Albert

    analysis of the single junction c-Si cell and the 5-junction Ge-(c-Si)-CZTS-(a-SiC)-GaP cell is performed

  11. COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY

    E-Print Network [OSTI]

    Laughlin, Robert B.

    CALIFORNIA ENERGY COMMISSION COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY GENERATION and Anitha Rednam, Comparative Costs of California Central Station Electricity Generation Technologies................................................................................................... 1 CHAPTER 1: Summary of Technology Costs

  12. Nonvolatile memory disturbs due to gate and junction leakage currents

    E-Print Network [OSTI]

    Schroder, Dieter K.

    ) from traps within the gate oxides. Such low gate leakage currents can lead to sufficient charge; accepted 10 September 2002 Abstract We address disturbs due to gate oxide and junction leakage currents in floating gate nonvolatile memories (NVM). The junction leakage is important, because the gate oxide current

  13. Profiling the Thermoelectric Power of Semiconductor Junctions with

    E-Print Network [OSTI]

    Profiling the Thermoelectric Power of Semiconductor Junctions with Nanometer Resolution Ho-Ki Lyeo,3 * We have probed the local thermoelectric power of semiconductor nanostruc- tures with the use of ultrahigh-vacuum scanning thermoelectric microscopy. When applied to a p-n junction, this method reveals

  14. Assessment of HTGR Helium Compressor Analysis Tool Based on Newton-Raphson Numerical Application to Through-flow Analysis

    SciTech Connect (OSTI)

    Ji Hwan Kim; Hyeun Min Kim; Hee Cheon NO [Korea Advanced Institute of Science and Technology, 335 Gwahangno - 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

    2006-07-01T23:59:59.000Z

    This study describes the development of a computer program for analyzing the off-design performance of axial flow helium compressors, which is one of the major concerns for the power conversion system of a high temperature gas-cooled reactor (HTGR). The compressor performance has been predicted by the aerodynamic analysis of meridional flow with allowances for losses. The governing equations have been derived from Euler turbomachine equation and the streamline curvature method, and then they have been merged into linearized equations based on the Newton-Raphson numerical method. The effect of viscosity is considered by empirical correlations to introduce entropy rises caused by primary loss sources. Use of the method has been illustrated by applying it to a 20-stage helium compressor of the GTHTR300 plant. As a result, the flow throughout the stages of the compressor has been predicted and the compressor characteristics have been also investigated according to the design specification. The program results show much better stability and good convergence with respect to other through-flow methods, and good agreement with the compressor performance map provided by JAEA. (authors)

  15. 7.1.1. Fernbahnhof / Rail Station

    E-Print Network [OSTI]

    Berlin,Technische Universität

    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

  16. Technical data HMS 760 X -36 stations

    E-Print Network [OSTI]

    Shoubridge, Eric

    water/rinse stations - 2 dry stations / or 2 pressure controlled DI stations - 60 slides per basket - 1. - Simultaneous multiple program execution for several programs. - Carriers for up to 2 slide baskets with 30 downwards ventilation flow and active charcoal filter. - Permanent program memory for more than 50 different

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

    SciTech Connect (OSTI)

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

    1995-08-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    Philippe R.-G. Piot; Winfried Decking

    2004-03-23T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

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

    2013-02-01T23:59:59.000Z

    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.

  20. Practical exergy analysis of centrifugal compressor performance using ASME-PTC-10 data

    SciTech Connect (OSTI)

    Carranti, F.J. [Hoffman Air and Filtration Systems, Syracuse, NY (United States)

    1997-07-01T23:59:59.000Z

    It has been shown that measures of performance currently in use for industrial and process compressors do not give a true measure of energy utilization, and that the required assumptions of isentropic or adiabatic behavior are now always valid. A better indication of machine or process performance can be achieved using exergetic (second law) efficiencies and by employing the second law of thermodynamics to indicate the nature of irreversibilities and entropy generation in the compression process. In this type of analysis, performance is related to an environmental equilibrium condition, or dead state. Often, the differences between avoidable and unavoidable irreversibilities ca be interpreted from these results. A general overview of the techniques involved in exergy analysis as applied to compressors and blowers is presented. A practical method to allow the calculation of exergetic efficiencies by manufacturers and end users is demonstrated using data from ASME Power Test Code input. These data are often readily available from compressor manufacturers for both design and off-design conditions, or can sometimes be obtained from field measurements. The calculations involved are simple and straightforward, and can demonstrate the energy usage situation for a variety of conditions. Here off-design is taken to mean at different rates of flow, as well as at different environmental states. The techniques presented are also applicable to many other equipment and process types.

  1. Mechanical deformations of boron nitride nanotubes in crossed junctions

    SciTech Connect (OSTI)

    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

    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.

  2. 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]

    2012-01-01T23:59:59.000Z

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

  3. 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]

    2011-01-01T23:59:59.000Z

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

  4. Dubuque generation station, Dubuque, Iowa

    SciTech Connect (OSTI)

    Peltier, R.

    2008-10-15T23:59:59.000Z

    Alliant Energy's Dubuque generation station is a fine example of why small does not mean insignificant in the power generation industry. This winner of the EUCG best performer award in the small plant category shows that its operating excellence towers over that of many larger and much newer coal-fired power plants. The plant has three operating units with boilers originally designed for Illinois basin coal but now Powder River Basin coal makes up 75% of the coal consumed. The boilers can also burn natural gas. 4 photos.

  5. 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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMFormsGasReleaseSpeechesHallNot Logged In You|DidYouKnowStation Hanford

  6. Power dissipation in a single molecule junction: Tracking energy levels

    E-Print Network [OSTI]

    Yaghoob Naimi; Javad Vahedi

    2014-12-05T23:59:59.000Z

    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.

  7. 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...

  8. apical cell junctions: Topics by E-print Network

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

    Viciana; Dora E. Vega-salas; Hans-peter Hauri; M. Brignoni 1997-01-01 3 Quantum Junction Solar Cells Jiang Tang,, Engineering Websites Summary: tuned primarily via control over...

  9. adhering junctions connecting: Topics by E-print Network

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

    of such experiments the number of magnetic flux quanta spontaneously trapped in a superconducting loop was measured by means of a long Josephson tunnel junction built on top of...

  10. adherens junctions connect: Topics by E-print Network

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

    of such experiments the number of magnetic flux quanta spontaneously trapped in a superconducting loop was measured by means of a long Josephson tunnel junction built on top of...

  11. Josephson Junctions and Devices fabricated by Focused Electron Beam Irradiation

    E-Print Network [OSTI]

    Booij, Wilfred Edwin

    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...

  12. Performance Evaluation and Analysis Consortium End Station |...

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

    highlighting the "bucket" algorithm from UIUC. Credit: Leonid Oliker, Lawrence Berkeley National Laboratory Performance Evaluation and Analysis Consortium End Station PI Name:...

  13. Hydrogen refueling station costs in Shanghai

    E-Print Network [OSTI]

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

    2007-01-01T23:59:59.000Z

    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

  14. Hydrogen refueling station costs in Shanghai

    E-Print Network [OSTI]

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

    2007-01-01T23:59:59.000Z

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

  15. 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...

  16. 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...

  17. 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...

  18. 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"...

  19. 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"...

  20. 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...

  1. 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...

  2. Sandia National Laboratories: Reference Station Design

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

    and the National Renewable Energy Laboratory (NREL) announce the publication of two new Hydrogen Fueling Infrastructure Research and Station Technology (H2FIRST) reports on...

  3. Sandia National Laboratories: hydrogen fueling station

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

    station Widespread Hydrogen Fueling Infrastructure Is the Goal of H2FIRST Project On June 4, 2014, in Capabilities, Center for Infrastructure Research and Innovation (CIRI),...

  4. Hydrogen Fueling Infrastructure Research and Station Technology...

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

    An Overview of the Hydrogen Fueling Infrastructure Research and Station Technology (H2FIRST) Project" held on November 18, 2014. Hydrogen Fueling Infrastructure Research and...

  5. 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.

  6. A Three-Isocenter Jagged-Junction IMRT Approach for Craniospinal Irradiation Without Beam Edge Matching for Field Junctions

    SciTech Connect (OSTI)

    Cao, Fred, E-mail: fcao@bccancer.bc.ca [Department of Medical Physics, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada)] [Department of Medical Physics, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada); Ramaseshan, Ramani; Corns, Robert; Harrop, Sheryl [Department of Medical Physics, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada)] [Department of Medical Physics, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada); Nuraney, Nimet; Steiner, Peter; Aldridge, Stephanie [Department of Radiation Oncology, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada)] [Department of Radiation Oncology, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada); Liu, Mitchell; Carolan, Hannah [Department of Radiation Oncology, Vancouver Centre, BC Cancer Agency, Vancouver, British Columbia (Canada)] [Department of Radiation Oncology, Vancouver Centre, BC Cancer Agency, Vancouver, British Columbia (Canada); Agranovich, Alex; Karvat, Anand [Department of Radiation Oncology, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada)] [Department of Radiation Oncology, Fraser Valley Centre, BC Cancer Agency, Surrey, British Columbia (Canada)

    2012-11-01T23:59:59.000Z

    Purpose: Traditionally craniospinal irradiation treats the central nervous system using two or three adjacent field sets. We propose a technique using a three-isocenter intensity-modulated radiotherapy (IMRT) plan (jagged-junction IMRT) which overcomes problems associated with field junctions and beam edge matching and improves planning and treatment setup efficiencies with homogenous target dose distribution. Methods and Materials: Treatments for 3 patients with a prescription of 36 Gy in 20 fractions were retrospectively planned with jagged-junction IMRT and compared to conventional treatment plans. Planning target volume (PTV) included the whole brain and spinal canal to the S3 vertebral level. The plan used three field sets, each with a unique isocenter. One field set with seven fields treated the cranium. Two field sets treated the spine, each set using three fields. Fields from adjacent sets were overlapped, and the optimization process smoothly integrated the dose inside the overlapped junction. Results: For jagged-junction IMRT plans vs. conventional technique, the average homogeneity index equaled 0.08 {+-} 0.01 vs. 0.12 {+-} 0.02, respectively, and conformity number equaled 0.79 {+-} 0.01 vs. 0.47 {+-} 0.12, respectively. The 95% isodose surface covered (99.5 {+-} 0.3)% of the PTV vs. (98.1 {+-} 2.0)%, respectively. Both jagged-junction IMRT plans and the conventional plans had good sparing of organs at risk. Conclusions: Jagged-junction IMRT planning provided good dose homogeneity and conformity to the target while maintaining a low dose to organs at risk. Results from jagged-junction IMRT plans were better than or equivalent to those from the conventional technique. Jagged-junction IMRT optimization smoothly distributed dose in the junction between field sets. Because there was no beam matching, this treatment technique is less likely to produce hot or cold spots at the junction, in contrast to conventional techniques. The planning process is also simplified as only one IMRT plan is required for the entire target volume.

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

    E-Print Network [OSTI]

    Shu, Guan; He, Xiang

    2014-01-01T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

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

    2013-01-01T23:59:59.000Z

    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).

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

    DOE Patents [OSTI]

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

    2014-08-26T23:59:59.000Z

    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.

  10. As the speed of the compressor was increased per test, any excess charge was held in the accumulator, which served as a receiver to maintain optimal charge level. Analytical results developed by Rice* indicated that the condenser exit

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    #12;As the speed of the compressor was increased per test, any excess charge was held in COP despite saturated conditions at the inlet to the compressor. Therefore, optimal airflow and refrigerant subcooling at the condenser exit were experimentally determined at discrete compressor speeds

  11. (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

  12. FINAL DESIGN OF ILC RTML EXTRACTION LINE FOR SINGLE STAGE BUNCH COMPRESSOR

    SciTech Connect (OSTI)

    Seletskiy, S.; Solyak, N.

    2011-03-28T23:59:59.000Z

    The use of single stage bunch compressor (BC) in the International Linear Collider (ILC) Damping Ring to the Main Linac beamline (RTML) requires new design for the extraction line (EL). The EL located downstream of the BC will be used for both an emergency abort dumping of the beam and the tune-up continuous train-by-train extraction. It must accept both compressed and uncompressed beam with energy spread of 3.54% and 0.15% respectively. In this paper we report the final design that allowed minimizing the length of such extraction line while offsetting the beam dumps from the main line by 5m distance required for acceptable radiation level in the service tunnel. Proposed extraction line can accommodate beams with different energy spreads at the same time providing the beam size suitable for the aluminum ball dump window. We described the final design of the ILC RTML extraction line located downstream of the new single-stage bunch compressor. The extraction line is only 24m long and is capable of accepting and transmitting 220kW of beam power. The EL can be used for both fast intra-train and continual extraction, and is capable of accepting both 0.15% and 3.54% energy spread beams at 5MeV and 4.37MeV respectively.

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

    DOE Patents [OSTI]

    Corey, John A. (North Troy, NY)

    1984-05-29T23:59:59.000Z

    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.

  14. Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes

    SciTech Connect (OSTI)

    Beach, R.; Burdick, A.

    2014-03-01T23:59:59.000Z

    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.

  15. Air pollution study of Laredo Customs Station

    E-Print Network [OSTI]

    Welling, Vidyadhar Yeshwant

    1972-01-01T23:59:59.000Z

    to the General Services Admin1stration for improv1ng the air quality at the Laredo Customs Station. The study includes investigation conducted on the site at the Station and at the Environmental Wind Tunnel Facilities located on the main campus of Texas A... the accuracy of the scaled model with that of the actual station a complete survey of veloc1ty, pressure, temperature and video tape recordings were taken in Laredo. These results were then compared with those simulated in the wind tunnel. Good correlation...

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

    SciTech Connect (OSTI)

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

    2006-07-01T23:59:59.000Z

    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)

  17. Junction-based field emission structure for field emission display

    DOE Patents [OSTI]

    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

    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.

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

    E-Print Network [OSTI]

    Bockelie, Adam

    2012-01-01T23:59:59.000Z

    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 ...

  19. Annexin A2 is Required for Endothelial Cell Junctional Response to S1P 

    E-Print Network [OSTI]

    Smith, Rebecca

    2014-01-14T23:59:59.000Z

    Endothelial cell (EC) junctions are critical for angiogenesis, the sprouting and growth of new blood vessels from existing vessels. Sphingosine 1-phosphate (S1P) is a proangiogenic factor that potently stimulates sprouting, fortifies EC junctions...

  20. Environmental Audit of the Grand Junction Projects Office

    SciTech Connect (OSTI)

    Not Available

    1991-08-01T23:59:59.000Z

    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.

  1. Sandia National Laboratories: More California Gas Stations Can...

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

    Infrastructure Research and Innovation (CIRI)More California Gas Stations Can Provide Hydrogen than Previously Thought, Sandia Study Says More California Gas Stations Can Provide...

  2. air station north: Topics by E-print Network

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

    quality monitoring station. Application to Physics Websites Summary: considered in the area of representativeness of differs from the station measurement by more than the given...

  3. Solution Methods for the Periodic Petrol Station Replenishment ...

    E-Print Network [OSTI]

    chefi

    2013-03-11T23:59:59.000Z

    The problem of planning petrol delivery to the distribution stations is well recognized in the Operations Research literature under the name of Petrol Station ...

  4. Alternative Fueling Station Locator App Provides Info at Your...

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

    iPhone app helps you find fueling stations that offer electricity, natural gas, biodiesel, E85, propane, or hydrogen. | Energy Department The Alternative Fueling Station...

  5. Fuel Station of the Future- Innovative Approach to Fuel Cell...

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

    Station of the Future- Innovative Approach to Fuel Cell Technology Unveiled in California Fuel Station of the Future- Innovative Approach to Fuel Cell Technology Unveiled in...

  6. 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...

  7. Hydrogen Fueling Station in Honolulu, Hawaii Feasibility Analysis...

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

    Fueling Station in Honolulu, Hawaii Feasibility Analysis Hydrogen Fueling Station in Honolulu, Hawaii Feasibility Analysis This feasibility report assesses the technical and...

  8. Free electron gas primary thermometer: The bipolar junction transistor

    SciTech Connect (OSTI)

    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

    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.

  9. Visible Y -junction diode laser with mixed coupling

    SciTech Connect (OSTI)

    van der Poel, C.J.; Opschoor, J.; Valster, A.; Drenten, R.R. (Philips Research Laboratories, P. O. Box 80 000, 5600 JA Eindhoven (The Netherlands)); Andre, J.P. (Laboratoires d'Electronique et de Physique Applique, 3 Avenue Descartes, 94450 Limeil-Brevannes (France))

    1990-07-15T23:59:59.000Z

    An experimental study and theoretical analysis of a phase-locked, visible, {lambda}=670 nm, 2-3 {ital Y}-junction semiconductor laser array are presented. In a ridgetype 2-3 {ital Y}-junction, AlInGaP/InGaP array, both in-phase and anti-phase array modes are observed to lase simultaneously. The experimental results are discussed in the framework of a model based on the beam propagation method. The influence of the presence of both interferometric and evanescent coupling on the array modes is analyzed.

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

    SciTech Connect (OSTI)

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

    1996-05-01T23:59:59.000Z

    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.

  11. COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY

    E-Print Network [OSTI]

    CALIFORNIA ENERGY COMMISSION COMPARATIVE COSTS OF CALIFORNIA CENTRAL STATION ELECTRICITY GENERATIONCann Please use the following citation for this report: Klein, Joel. 2009. Comparative Costs of California............................................................................................................................1 Changes in the Cost of Generation Model

  12. CASE CRITICAL The Navajo Generating Station

    E-Print Network [OSTI]

    Hall, Sharon J.

    Republic The Navajo Generating Station, the largest coal-fired power plant in the West, provides electrical-old plant, Arizona's largest single source of carbon pollution, needs to update its pollution controls. Join

  13. Hydrogen Refueling Station Costs in Shanghai

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

    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

  14. The College Station Residential Energy Compliance Code

    E-Print Network [OSTI]

    Claridge, D. E.; Schrock, D.

    1988-01-01T23:59:59.000Z

    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...

  15. Repowering of the Midland Nuclear Station 

    E-Print Network [OSTI]

    Gatlin, C. E. Jr.; Vellender, G. C.; Mooney, J. A.

    1988-01-01T23:59:59.000Z

    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 the largest cogeneration facility...

  16. CHARGING STATION FOR ELECTRIC VEHICLES GREEN PARKING

    E-Print Network [OSTI]

    Vellend, Mark

    CHARGING STATION FOR ELECTRIC VEHICLES P 3 P 3 P 6 GREEN PARKING UNIVERSITÉ DE SHERBROOKE YELLOW (CAR-POOLING) PERMITS HOSPITAL PARKING PARKING-PERMIT DISPENSERS RESERVED DISABLED PARKING PLACES ONE

  17. Hydrogen Refueling Station Costs in Shanghai

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

    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

  18. 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.

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

    SciTech Connect (OSTI)

    Geisz, J. F.

    2008-11-01T23:59:59.000Z

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

  20. TM-mode coupling to a Josephson junction S. J. Lewandowski

    E-Print Network [OSTI]

    Boyer, Edmond

    of the junction electrodes. to the j unction was provided by two leads immersed in superconducting solder, which

  1. Solar and Infrared Radiation Station (SIRS) Handbook

    SciTech Connect (OSTI)

    Stoffel, T

    2005-07-01T23:59:59.000Z

    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)

  2. Nanowire-Based Molecular Monolayer Junctions: Synthesis, Assembly, and Electrical Characterization

    E-Print Network [OSTI]

    (phenylene vinylene) (OPV) were prepared by replicating the pores of sub-40 nm diameter polycarbonate track etched that the conductance of junctions formed with -conjugated oligomers are several orders of magnitude larger than the saturated alkanes, with the OPV junctions having the highest conductance. The molecular wire junction

  3. DESIGN APPROACHES AND MATERIALS PROCESSES FOR ULTRAHIGH EFFICIENCY LATTICE MISMATCHED MULTI-JUNCTION SOLAR CELLS

    E-Print Network [OSTI]

    Atwater, Harry

    -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

  4. Novel InGaAsN pn Junction for High-Efficiency Multiple-Junction Solar Cells

    SciTech Connect (OSTI)

    Allerman, A.A.; Chang, P.C.; Gee, J.M.; Hammons, B.E.; Hou, H.Q.; Jones, E.D.; Kurtz, S.R.; Reinhardt, K.C.

    1999-03-26T23:59:59.000Z

    We report the application of a novel material, InGaAsN, with bandgap energy of 1.05 eV as a junction in an InGaP/GaAs/InGaAsN/Ge 4-junction design. Results of the growth and structural, optical, and electrical properties were demonstrated, showing the promising perspective of this material for ultra high efficiency solar cells. Photovoltaic properties of an as-grown pn diode structure and improvement through post growth annealing were also discussed.

  5. Self-latching eccentric cam for dual stroke compressor or pump

    DOE Patents [OSTI]

    Sisk, F.J.

    1985-01-22T23:59:59.000Z

    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.

  6. Heat pump employing optimal refrigerant compressor for low pressure ratio applications

    DOE Patents [OSTI]

    Ecker, Amir L. (Dallas, TX)

    1982-01-01T23:59:59.000Z

    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.

  7. Photo-Thermoelectric Effect at a Graphene Interface Junction

    E-Print Network [OSTI]

    McEuen, Paul L.

    Photo-Thermoelectric Effect at a Graphene Interface Junction Xiaodong Xu, Nathaniel M. Gabor increase at the cryogenic temperature as compared to room temperature. Assuming the thermoelectric power predictions. KEYWORDS Graphene, photocurrent, photo-thermoelectric effect D evices that convert photons

  8. Modeling Social Network Relationships via t-Cherry Junction Trees

    E-Print Network [OSTI]

    Reisslein, Martin

    Modeling Social Network Relationships via t-Cherry Junction Trees Brian Proulx and Junshan Zhang Abstract--The massive scale of online social networks makes it very challenging to characterize intractable model for users' relationships in a social network. There are a number of advantages

  9. PARAMETRIC EXCITATION OF PLASMA OSCILLATIONS IN JOSEPHSON JUNCTIONS

    E-Print Network [OSTI]

    Boyer, Edmond

    b. ' FIG. 3. - (a) 03B1c tan çoo vs. 2/Q at co = 2 cop. Straight line : theory. Circles : analog harmonic generation with big amplitude may be understood from a discussion of the stability properties frequency FIG. 1. - The junction model. For the analog R = 500 il, Io = 1 mA, C = 100 nF, and k = « 2 e

  10. Model based multivariable controller for large scale compression stations. Design and experimental validation on the LHC 18KW cryorefrigerator

    SciTech Connect (OSTI)

    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

    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.

  11. Hydrogen Fueling - Coming Soon to a Station Near You (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2009-04-01T23:59:59.000Z

    Fact sheet providing information useful to local permitting officials facing hydrogen fueling station proposals.

  12. Station Processing for a Low Frequency Array in WA

    E-Print Network [OSTI]

    Ellingson, Steven W.

    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

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

    E-Print Network [OSTI]

    Weinert, Jonathan X.; Lipman, Timothy

    2006-01-01T23:59:59.000Z

    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

  14. Mutual synchronization of two stacks of intrinsic Josephson junctions in cuprate superconductors

    SciTech Connect (OSTI)

    Lin, Shi-Zeng [Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

    2014-05-07T23:59:59.000Z

    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.

  15. The Normal/Bloomington Amtrak passenger station

    SciTech Connect (OSTI)

    Francis, C.E. [Illinois State Univ., Normal, IL (United States)

    1995-11-01T23:59:59.000Z

    The new Normal/Bloomington, Illinois Amtrak railroad passenger station was completed in 1990. A number of energy conservation technologies have been combined to provide for efficient railroad operations, passenger comfort, and a pleasing atmosphere. Passive solar heating, shading, and the building`s thermal efficiency have substantially reduced the amount of energy required for space conditions. The use of daylighting high efficiency fluorescent and high pressure sodium lighting as well as electronic load management have reduced energy requirements for lighting more than 70%. A stand-alone PV system provides energy for a portion of the building`s electrical requirement. An average monthly output of 147 kWh accounts for approximately 7.5% of the total electrical load. Overall, this station requires less than 25% of the energy required by a recently built `typical` station of similar size in a similar climate.

  16. Hydrogen fueling station development and demonstration

    SciTech Connect (OSTI)

    Edeskuty, F.J.; Daney, D.; Daugherty, M.; Hill, D.; Prenger, F.C.

    1996-09-01T23:59:59.000Z

    This is the final report of a one-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). This project sought to develop and demonstrate a hydrogen fueling station for vehicles. Such stations are an essential infrastructural element in the practical application of hydrogen as vehicle fuel, and a number of issues such as safety, efficiency, design, and operating procedures can only be accurately addressed by a practical demonstration. Regardless of whether the vehicle is powered by an internal combustion engine or fuel cell, or whether the vehicle has a liquid or gaseous fuel tank, the fueling station is a critical technology that is the link between the local storage facility and the vehicle.

  17. Economic Analysis of Hydrogen Energy Station Concepts: Are "H 2E-Stations" a Key Link to a Hydrogen Fuel Cell Vehicle Infrastructure?

    E-Print Network [OSTI]

    Lipman, Timothy E.; Edwards, Jennifer L.; Kammen, Daniel M.

    2002-01-01T23:59:59.000Z

    in the analysis of hydrogen energy stations, additionalattractiveness of the hydrogen energy station scheme in bothECONOMIC ANALYSIS OF HYDROGEN ENERGY STATION CONCEPTS: ARE '

  18. Integrated natural-gas-engine cooling jacket vapor-compressor program. Annual progress report (phase 2), January-December 1987

    SciTech Connect (OSTI)

    DiBella, F.A.; Becker, F.

    1988-01-01T23:59:59.000Z

    A unique, alternative cogeneration system was designed that will provide an industrial or commercial energy user with high-pressure steam and electricity directly from a packaged cogeneration system. The Integrated Gas Engine Vapor Compression System concept includes an engine-generator set and a steam screw compressor that are mechanically integrated with the engine. The gas-fueled engine is ebulliently cooled, thus allowing its water jacket heat to be recovered in the form of low-pressure steam. This steam is then compressed by the steam compressor to a higher pressure, and when combined with the high-pressure steam generated in the engine's exhaust gas boiler it provides the end user with a more useable thermal energy source. Phase 1B of this project was completed in 1986 and consisted primarily of the procurement of equipment and the final design and assembly of a prototype integrated gas-engine vapor-compression system.

  19. Numerical simulations of output pulse extraction from a high-power microwave compressor with a plasma switch

    SciTech Connect (OSTI)

    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

    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.

  20. Pump station for radioactive waste water

    DOE Patents [OSTI]

    Whitton, John P.; Klos, Dean M.; Carrara, Danny T.; Minno, John J.

    2003-11-18T23:59:59.000Z

    A pump station for transferring radioactive particle containing waste water, includes: (a.) an enclosed sump having a vertically elongated right frusto conical wall surface and a bottom surface and (b.) a submersible volute centrifugal pump having a horizontally rotating impeller and a volute exterior surface. The sump interior surface, the bottom surface and the volute exterior surface are made of stainless steel having a 30 Ra or finer surface finish. A 15 Ra finish has been found to be most cost effective. The pump station is used for transferring waste water, without accumulation of radioactive fines.

  1. Design of a photovoltaic central power station

    SciTech Connect (OSTI)

    Not Available

    1984-02-01T23:59:59.000Z

    Photovoltaic central power station designs have been developed for both high-efficiency flat-panel arrays and two-axis tracking concentrator arrays. Both designs are based on a site adjacent to the Saguaro Power Station of Arizona Public Service. The plants are 100 MW each, made of 5 MW subfields. The site specific designs allow detailed cost estimate for site preparation, installation, and engineering. These designs are summarized and cost estimates analyzed. Provided also are recommendations for future work to reduce system cost for each plant design.

  2. Topological p-n junctions in helical edge states

    E-Print Network [OSTI]

    Disha Wadhawan; Poonam Mehta; Sourin Das

    2014-11-24T23:59:59.000Z

    Quantum spin Hall effect is endowed with topologically protected edge modes with gapless Dirac spectrum. Applying a magnetic field locally along the edge leads to a gapped edge spectrum with opposite parity for winding of spin texture for conduction and valence band. Using Pancharatnam's prescription for geometric phase it is shown that mismatch of this parity across a p-n junction, which could be engineered into the edge by electrical gate induced doping, leads to a phase dependence in the two-terminal conductance which is purely topological (0 or $\\pi$). This fact results in a ${\\mathbb{Z}}_2$ classification of such junctions with an associated duality. Current asymmetry measurements which are shown to be robust against electron-electron interactions are proposed to infer this topology.

  3. Transient Dynamics in Molecular Junctions: Coherent Bichromophoric Molecular Electron Pumps

    E-Print Network [OSTI]

    Roie Volkovich; Uri Peskin

    2010-12-01T23:59:59.000Z

    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.

  4. Epithelial cell polarity and cell junctions in drosophila

    E-Print Network [OSTI]

    Tepass, Ulrich; Tanentzapf­ , Guy; Ward, Robert; Fehon, Richard

    2001-12-01T23:59:59.000Z

    18 Oct 2001 10:14 AR AR144-24.tex AR144-24.sgm ARv2(2001/05/10) P1: GJB Annu. Rev. Genet. 2001. 35:747?84 Copyright c 2001 by Annual Reviews. All rights reserved EPITHELIAL CELL POLARITY AND CELL JUNCTIONS IN DROSOPHILA Ulrich Tepass and Guy....35:747-784. Downloaded from arjournals.annualreviews.org by University of Kanas-Lawrence & Edwards on 09/26/05. For personal use only. 18 Oct 2001 10:14 AR AR144-24.tex AR144-24.sgm ARv2(2001/05/10) P1: GJB 748 TEPASS ET AL. THE SEPTATE JUNCTION...

  5. Instability of superconducting state in Josephson tunnel junctions

    SciTech Connect (OSTI)

    Nevirkovets, I.P.; Rudenko, =.M.

    1984-02-01T23:59:59.000Z

    Experiments on low-resistance Josephson Sn--I--Sn tunnel junctions have shown the superconductor to exhibit an instability that manifests itself on the current--voltage characteristic (IVC) in the form of a jumplike decrease of the voltage when it reaches a value 2..delta../e. When a weak magnetic field H is applied parallel to the junction plane and suppresses the nonstationary Josephson effect, the negative-slope IVC section vanishes. The H-dependent instability-current component, as well as the dc component of the Josephson current near 2..delta../e, can be approximated by a function of H/sup -2/. The singularity observed is attributed to the presence of a maximum of the superconducting component, due to the Riedel singularity, at V = 2..delta../e.

  6. Strain designed Josephson $?$ junction qubits with topological insulators

    E-Print Network [OSTI]

    Colin Benjamin

    2015-04-09T23:59:59.000Z

    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.

  7. Nonlinear thermal control in an N-terminal junction

    E-Print Network [OSTI]

    Dvira Segal

    2007-09-27T23:59:59.000Z

    We demonstrate control over heat flow in an N-terminal molecular junction. Using simple model Hamiltonians we show that the heat current through two terminals can be tuned, switched, and amplified, by the temperature and coupling parameters of external gating reservoirs. We discuss two models: A fully harmonic system, and a model incorporating anharmonic interactions. For both models the control reservoirs induce thermal fluctuations of the transition elements between molecular vibrational states. We find that a fully harmonic model does not show any controllability, while for an anharmonic system the conduction properties of the junction strongly depend on the parameters of the gates. Realizations of the model system within nanodevices and macromolecules are discussed.

  8. Towards understanding junction degradation in cadmium telluride solar cells

    SciTech Connect (OSTI)

    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

    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.

  9. Tethered nuclear power for the Space Station

    SciTech Connect (OSTI)

    Bents, D.J.

    1985-01-01T23:59:59.000Z

    A nuclear space power system the SP-100 is being developed for future missions where large amounts of electrical power will be required. Although it is primarily intended for unmanned spacecraft, it can be adapted to a manned space platform by tethering it above the station through an electrical transmission line which isolates the reactor far away from the inhabited platform and conveys its power back to where it is needed. The transmission line, used in conjunction with an instrument rate shield, attenuates reactor radiation in the vicinity of the space station to less than one-one hundredth of the natural background which is already there. This combination of shielding and distance attenuation is less than one-tenth the mass of boom-mounted or onboard man-rated shields that are required when the reactor is mounted nearby. This paper describes how connection is made to the platform (configuration, operational requirements) and introduces a new element the coaxial transmission tube which enables efficient transmission of electrical power through long tethers in space. Design methodology for transmission tubes and tube arrays is discussed. An example conceptual design is presented that shows SP-100 at three power levels 100 kWe, 300 kWe, and 1000 kWe connected to space station via a 2 km HVDC transmission line/tether. Power system performance, mass, and radiation hazard are estimated with impacts on space station architecture and operation.

  10. City of College Station's Thermographic Mobile Scan

    E-Print Network [OSTI]

    Shear, C. K.

    1986-01-01T23:59:59.000Z

    During the first quarter of 1986, the City of College Station conducted a thermographic mobile scan of the entire city. A thermographic mobile scan is a process by which heat loss/heat gain data is accumulated by a vehicle traveling the city...

  11. TechnicalDesign Report, Second Target Station

    SciTech Connect (OSTI)

    Galambos, John D [ORNL; Anderson, David E [ORNL; Bechtol, D [HDR, Inc.; Bethea, Katie L [ORNL; Brown, N [Barge Waggoner Sumner & Cannon, Inc.; Carden, W. F. [Oak Ridge National Laboratory (ORNL); Chae, Steven M [ORNL; Clark, A. [Barge Waggoner Sumner & Cannon, Inc.; Counce, Deborah M [ORNL; Craft, K [Barge Waggoner Sumner & Cannon, Inc.; Crofford, Mark T [ORNL; Collins, Richard M [ORNL; Cousineau, Sarah M [ORNL; Curry, Douglas E [ORNL; Cutler, Roy I [ORNL; Dayton, Michael J [ORNL; Dean, Robert A [ORNL; Deibele, Craig E [ORNL; Doleans, Marc [ORNL; Dye, T. [HDR, Inc.; Eason, Bob H [ORNL; Eckroth, James A [ORNL; Fincrock, C [HDR, Inc.; Fritts, S. [Barge Waggoner Sumner & Cannon, Inc.; Gallmeier, Franz X [ORNL; Gawne, Ken R [ORNL; Hartman, Steven M [ORNL; Herwig, Kenneth W [ORNL; Hess, S. [HDR, Inc.; Holmes, Jeffrey A [ORNL; Horak, Charlie M [ORNL; Howell, Matthew P [ORNL; Iverson, Erik B [ORNL; Jacobs, Lorelei L [ORNL; Jones, Larry C [ORNL; Johnson, B. [HDR, Inc.; Johnson, S. [HDR, Inc.; Kasemir, Kay [ORNL; Kim, Sang-Ho [ORNL; Laughon, Gregory J [ORNL; Lu, W. [Oak Ridge National Laboratory (ORNL); Mahoney, Kelly L [ORNL; Mammosser, John [ORNL; McManamy, T. [McManamy Consulting, Inc.; Michilini, M. [HDR, Inc.; Middendorf, Mark E [ORNL; O'Neal, Ed [Oak Ridge National Laboratory (ORNL); Nemec, B. [Barge Waggoner Sumner & Cannon, Inc.; Peters, Roy Cecil [ORNL; Plum, Michael A [ORNL; Reagan, G. [Barge Waggoner Sumner & Cannon, Inc.; Remec, Igor [ORNL; Rennich, Mark J [ORNL; Riemer, Bernie [ORNL; Saethre, Robert B [ORNL; Schubert, James Phillip [ORNL; Shishlo, Andrei P [ORNL; Smith, C Craig [ORNL; Strong, William Herb [ORNL; Tallant, Kathie M [ORNL; Tennant, David Alan [ORNL; Thibadeau, Barbara M [ORNL; Trumble, S. [HDR, Inc.; Trotter, Steven M [ORNL; Wang, Z. [Institute of Modern Physics (IMP), Chinese Academy of Sciences; Webb, Steven B [ORNL; Williams, Derrick C [ORNL; White, Karen S [ORNL; Zhao, Jinkui [ORNL

    2015-01-01T23:59:59.000Z

    The Second Target Station (STS) is a proposed upgrade for SNS. It includes a doubling of the accelerator power and an additional instrument hall. The new instrument hall will recieve a 467 kW 10 Hz beam. The parameters and preliminary design aspects of the STS are presented for the accelerator, target systems, instrument hall, instruments and civil construction aspects.

  12. Michigan State University Agricultural Experiment Station

    E-Print Network [OSTI]

    Douches, David S.

    Michigan State University Agricultural Experiment Station In Cooperation with the Michigan Potato Industry Commission Michigan Potato Research Report 2005 Volume 37 #12;Funding: Fed. Grant/MPIC 2005 POTATO. Hammerschmidt and W. Kirk Departments of Crop and Soil Sciences and Plant Pathology Michigan State University

  13. MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION

    E-Print Network [OSTI]

    Douches, David S.

    MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION IN COOPERATION WITH THE MICHIGAN POTATO INDUSTRY COMMISSION 2004 Michigan Potato Research Report Volume 36 Left to Right: Ben Kudwa, MPIC; Caryn of Crop and Soil Sciences Michigan State University East Lansing, MI 48824 Cooperators: R.W. Chase, Ray

  14. MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION

    E-Print Network [OSTI]

    Douches, David S.

    MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION IN COOPERATION WITH THE MICHIGAN POTATO INDUSTRY COMMISSION MICHIGAN POTATO RESEARCH REPORT 2003 Volume 35 Click Here to Open the 2003 Potato Sciences and Plant Pathology Michigan State University East Lansing, MI 48824 INTRODUCTION Each year we

  15. Michigan State University Agricultural Experiment Station

    E-Print Network [OSTI]

    Douches, David S.

    Michigan State University Agricultural Experiment Station In Cooperation with the Michigan Potato Industry Commission Michigan Potato Research Report 2005 Volume 37 #12;2005 POTATO BREEDING AND GENETICS Department of Crop and Soil Sciences Michigan State University East Lansing, MI 48824 Cooperators: R.W. Chase

  16. MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION

    E-Print Network [OSTI]

    Douches, David S.

    MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION IN COOPERATION WITH THE MICHIGAN POTATO INDUSTRY COMMISSION MICHIGAN POTATO RESEARCH REPORT 2003 Volume 35 Click Here to Open the 2003 Potato, S. Cooper, L. Frank, J. Driscoll, and E. Estelle Department of Crop and Soil Sciences Michigan State

  17. MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION

    E-Print Network [OSTI]

    Douches, David S.

    MICHIGAN STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION IN COOPERATION WITH THE MICHIGAN POTATO INDUSTRY COMMISSION 2004 Michigan Potato Research Report Volume 36 Left to Right: Ben Kudwa, MPIC; Caryn and W. Kirk Departments of Crop and Soil Sciences and Plant Pathology Michigan State University East

  18. TARGET STATION INFRASTRUCTURE THE CNGS EXPERIENCE

    E-Print Network [OSTI]

    McDonald, Kirk

    of Aluminum Water cooled Current: 150kA (horn) ­ 180 kA (reflector) Pulse duration 7ms #12;Key elements Remote handling Remote station for radiation survey in the target chamber #12;CNGS Target Area I per cooling circuit 2007 run radiation effects on ventilation system electronics broken flexible stripline

  19. TEST STATION SALE OF PERFORMANCE TESTED BULLS

    E-Print Network [OSTI]

    Tennessee, University of

    in the test had to meet minimum performance requirements. Those were: CREEP NON-CREEP Adj 205 day wt. 560 520AS-B428 U T BULL TEST STATION SALE OF PERFORMANCE TESTED BULLS THURSDAY, MARCH 8, 2012 12:00 NOON IN GREENEVILLE AND KNOXVILLE LIVESTOCK CENTER http://animalscience.ag.utk.edu/ (For video) #12;UT BULL TEST

  20. Recent developments in HVDC convertor station design

    SciTech Connect (OSTI)

    Carlsson, L.

    1984-08-01T23:59:59.000Z

    New requirements on HVDC convertor station performance have emerged during the past few years. The paper presents some of these requirements and shows how they have been met through equipment and system development. This development will result in a new generation of HVDC transmissions with still better performance than for the projects presently in operation.

  1. United States Department of Energy, Grand Junction Office

    SciTech Connect (OSTI)

    Not Available

    1980-01-01T23:59:59.000Z

    The Grand Junction Office (GJO), US Department of Energy (DOE), develops and administers programs for evaluating domestic uranium resources and the production capability of industry; for developing resource planning information for DOE; and for advancing geologic and geophysical exploration concepts and techniques. In addition, GJO administers the leasing of mineral lands under DOE control, and carries out activities relating to the environmental aspects of uranium mining and milling, including remedial programs. The Office is staffed by administrative and technical program-management personnel. Bendix Field Engineering Corporation (Bendix) is the DOE operating contractor at the Grand Junction, Colorado, Government-owned/contractor-operated (GOCO) facility. The technical staffs of both GJO and Bendix are primarily geoscience-oriented. Specifically during 1980, uranium resource assessment on 135 National Topographic Map Series (NTMS) quadrangles was completed, along with other specific studies, to yield October 1980 national resource estimates. In addition, updated uranium supply analysis and production capability projections were completed. Another key aspect of this successful program was the development of improved geophysical and geochemical equipment and techniques in support of uranium resource assessment. Much of the hardware and know-how developed was turned over to the public and to the uranium industry at large for application to uranium exploration and the assessment of uranium company resources. The Grand Junction Office also participated actively during 1980 in international cooperative research on uranium exploration techniques and on the geology of uranium deposits.

  2. FERROELECTRIC SWITCH FOR A HIGH-POWER Ka-BAND ACTIVE PULSE COMPRESSOR

    SciTech Connect (OSTI)

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

    2013-12-18T23:59:59.000Z

    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.

  3. Condenser, compressor, and HRSG cleaning in combined cycles: How often is too often?

    SciTech Connect (OSTI)

    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

    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.

  4. Aerodynamically induced radial forces in a centrifugal gas compressor: Part 2 -- Computational investigation

    SciTech Connect (OSTI)

    Flathers, M.B.; Bache, G.E.

    1999-10-01T23:59:59.000Z

    Radial loads and direction of a centrifugal gas compressor containing a high specific speed mixed flow impeller and a single tongue volute were determined both experimentally and computationally at both design and off-design conditions. The experimental methodology was developed in conjunction with a traditional ASME PTC-10 closed-loop test to determine radial load and direction. The experimental study is detailed in Part 1 of this paper (Moore and Flathers, 1998). The computational method employs a commercially available, fully three-dimensional viscous code to analyze the impeller and the volute interaction. An uncoupled scheme was initially used where the impeller and volute were analyzed as separate models using a common vaneless diffuser geometry. The two calculations were then repeated until the boundary conditions at a chosen location in the common vaneless diffuser were nearly the same. Subsequently, a coupled scheme was used where the entire stage geometry was analyzed in one calculation, thus eliminating the need for manual iteration of the two independent calculations. In addition to radial load and direction information, this computational procedure also provided aerodynamic stage performance. The effect of impeller front face and rear face cavities was also quantified. The paper will discuss computational procedures, including grid generation and boundary conditions, as well as comparisons of the various computational schemes to experiment. The results of this study will show the limitations and benefits of Computational Fluid Dynamics (CFD) for determination of radial load, direction, and aerodynamic stage performance.

  5. MHD compressor---expander conversion system integrated with GCR inside a deployable reflector

    SciTech Connect (OSTI)

    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

    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''.

  6. Multi-bottle, no compressor, mean pressure control system for a Stirling engine

    DOE Patents [OSTI]

    Corey, John A. (Melrose, NY)

    1990-01-01T23:59:59.000Z

    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.

  7. Environmental assessment of facility operations at the U.S. Department of Energy Grand Junction Projects Office, Grand Junction, Colorado

    SciTech Connect (OSTI)

    NONE

    1996-06-01T23:59:59.000Z

    The US Department of Energy (DOE) has prepared a sitewide environmental assessment (EA) of the proposed action to continue and expand present-day activities on the DOE Grand Junction Projects Office (GJPO) facility in Grand Junction, Colorado. Because DOE-GJPO regularly proposes and conducts many different on-site activities, DOE decided to evaluate these activities in one sitewide EA rather than in multiple, activity-specific documents. On the basis of the information and analyses presented in the EA, DOE has determined that the proposed action does not constitute a major Federal action significantly affecting the quality of the human environment, as defined by the National Environmental Policy Act (NEPA) of 1969. Therefore, preparation of an environmental impact statement is not required for facility operations, and DOE is issuing this Finding of No Significant Impact (FONSI).

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

    E-Print Network [OSTI]

    Lipman, T E; Weinert, Jonathan X.

    2006-01-01T23:59:59.000Z

    Installed Capital Figure 4-21: Cost Estimates for 1,000 kg/station. H2Gen’s estimates for capital costs are also lowerestimates and show high variability (26%-117% of capital costs).

  9. Shunt-capacitor-assisted synchronization of oscillations in intrinsic Josephson junctions stack.

    SciTech Connect (OSTI)

    Martin, I.; Halasz, G. B.; Bulaevskii, L. N.; Koshelev, A. E.; Materials Science Division; LANL

    2010-08-06T23:59:59.000Z

    We show that a shunt capacitor, by coupling each Josephson junction to all the other junctions, stabilizes synchronized oscillations in an intrinsic Josephson junction stack biased by a dc current. This synchronization mechanism is similar to the previously discussed radiative coupling between junctions, however, it is not defined by the geometry of the stack. It is particularly important in crystals with smaller numbers of junctions (where the radiation coupling is weak), and is comparable with the effect of strong super-radiation in crystals with many junctions. The shunt also helps to enter the phase-locked regime in the beginning of the oscillations, after switching on the bias current. Furthermore, it may be used to tune radiation power, which drops as the shunt capacitance increases.

  10. Process For Direct Integration Of A Thin-Film Silicon P-N Junction Diode With A Magnetic Tunnel Junction

    DOE Patents [OSTI]

    Toet, Daniel (Mountain View, CA); Sigmon, Thomas W. (Albuquerque, NM)

    2005-08-23T23:59:59.000Z

    A process for direct integration of a thin-film silicon p-n junction diode with a magnetic tunnel junction for use in advanced magnetic random access memory (MRAM) cells for high performance, non-volatile memory arrays. The process is based on pulsed laser processing for the fabrication of vertical polycrystalline silicon electronic device structures, in particular p-n junction diodes, on films of metals deposited onto low temperature-substrates such as ceramics, dielectrics, glass, or polymers. The process preserves underlayers and structures onto which the devices are typically deposited, such as silicon integrated circuits. The process involves the low temperature deposition of at least one layer of silicon, either in an amorphous or a polycrystalline phase on a metal layer. Dopants may be introduced in the silicon film during or after deposition. The film is then irradiated with short pulse laser energy that is efficiently absorbed in the silicon, which results in the crystallization of the film and simultaneously in the activation of the dopants via ultrafast melting and solidification. The silicon film can be patterned either before or after crystallization.

  11. Process for direct integration of a thin-film silicon p-n junction diode with a magnetic tunnel junction

    DOE Patents [OSTI]

    Toet, Daniel (Mountain View, CA); Sigmon, Thomas W. (Albuquerque, NM)

    2003-01-01T23:59:59.000Z

    A process for direct integration of a thin-film silicon p-n junction diode with a magnetic tunnel junction for use in advanced magnetic random access memory (MRAM) cells for high performance, non-volatile memory arrays. The process is based on pulsed laser processing for the fabrication of vertical polycrystalline silicon electronic device structures, in particular p-n junction diodes, on films of metals deposited onto low temperature-substrates such as ceramics, dielectrics, glass, or polymers. The process preserves underlayers and structures onto which the devices are typically deposited, such as silicon integrated circuits. The process involves the low temperature deposition of at least one layer of silicon, either in an amorphous or a polycrystalline phase on a metal layer. Dopants may be introduced in the silicon film during or after deposition. The film is then irradiated with short pulse laser energy that is efficiently absorbed in the silicon, which results in the crystallization of the film and simultaneously in the activation of the dopants via ultrafast melting and solidification. The silicon film can be patterned either before or after crystallization.

  12. Process for direct integration of a thin-film silicon p-n junction diode with a magnetic tunnel junction

    DOE Patents [OSTI]

    Toet, Daniel; Sigmon, Thomas W.

    2004-12-07T23:59:59.000Z

    A process for direct integration of a thin-film silicon p-n junction diode with a magnetic tunnel junction for use in advanced magnetic random access memory (MRAM) cells for high performance, non-volatile memory arrays. The process is based on pulsed laser processing for the fabrication of vertical polycrystalline silicon electronic device structures, in particular p-n junction diodes, on films of metals deposited onto low temperature-substrates such as ceramics, dielectrics, glass, or polymers. The process preserves underlayers and structures onto which the devices are typically deposited, such as silicon integrated circuits. The process involves the low temperature deposition of at least one layer of silicon, either in an amorphous or a polycrystalline phase on a metal layer. Dopants may be introduced in the silicon film during or after deposition. The film is then irradiated with short pulse laser energy that is efficiently absorbed in the silicon, which results in the crystallization of the film and simultaneously in the activation of the dopants via ultrafast melting and solidification. The silicon film can be patterned either before or after crystallization.

  13. Aquatic impacts from operation of three midwestern nuclear power stations: Cooper Nuclear Station environmental appraisal report

    SciTech Connect (OSTI)

    Brice, J.R.

    1981-10-01T23:59:59.000Z

    Cooper Nuclear Station is located on the Nebraska side of the Missouri River in Nemaha County. The station utilizes a boiling water reactor and steam turbine generator to produce 778 MW (net) of electrical power. The cooling system is a once-through design that withdraws water from, and discharges to, the Missouri River. No significant adverse impacts to the biota of the Missouri River from the Cooper Nuclear Station discharge were detected. Localized effects in the vicinity of the discharge have been observed. These include changes in the diversity and productivity of phytoplankton, periphyton, and benthic invertebrates at certain times of the year. The station appears to entrain large numbers of catostomid larvae, but this loss is not reflected in the available commercial fisheries statistics. Large numbers of gizzard shad and freshwater drum are impinged annually by Cooper Nuclear Station, but neither of these species seem to be adversely affected. Bigmouth buffalo populations could potentially suffer losses, but as was the case with the other catostomids, commercial catches of bigmouth buffalo did not seem to be affected by station operation.

  14. Mode stabilization mechanism of buried waveguide lasers with lateral diffused junctions

    SciTech Connect (OSTI)

    Yu, K.L.; Chen, T.R.; Koren, U.; Lau, K.Y.; Margalit, S.; Yariv, A.

    1983-03-01T23:59:59.000Z

    The mode stabilization behavior of the buried active waveguide with lateral diffused junction is theoretically investigated. The study shows that for an active waveguide of width around 5 ..mu..m with a lateral diffused junction in the middle, the single fundamental transverse mode is preferred as the injection level is raised. The theoretical results are found to be in good agreement with experimental results observed in the groove transverse junction InGaAsP/InP laser.

  15. An analysis of railroad accident dynamics in College Station, Texas 

    E-Print Network [OSTI]

    Brown, Hart Stefan

    1998-01-01T23:59:59.000Z

    The intersection between the Union Pacific Railroad (UP) Valley Junction line and Texas A&M University (TAMU) poses a significant potential or risk to the people who utilize the campus. The line carried over I 1,000 loads ...

  16. Upcoming H2USA Workshop: Hydrogen Fueling Station Component Listings...

    Office of Environmental Management (EM)

    H2USA Workshop: Hydrogen Fueling Station Component Listings Upcoming H2USA Workshop: Hydrogen Fueling Station Component Listings April 21, 2015 - 1:04pm Addthis H2USA will host an...

  17. Which way is up : towards accessible wayfinding in transit stations

    E-Print Network [OSTI]

    Leven, Dalia (Dalia Beth)

    2006-01-01T23:59:59.000Z

    Passengers' most frequent interaction with a rail transit system is at its stations, which represent the beginning, the end and sometimes the middle of transit trips. The design of these stations can greatly affect a user's ...

  18. Nuclear Rocket Development Station at the Nevada Test Site |...

    Office of Environmental Management (EM)

    Rocket Development Station at the Nevada Test Site Nuclear Rocket Development Station at the Nevada Test Site During the 1950s, the United States launched a nuclear rocket program...

  19. Development of By-Pass Blending Station System

    E-Print Network [OSTI]

    Liu, M.; Barnes, D.; Bunz, K.; Rosenberry, N.

    2003-01-01T23:59:59.000Z

    A new building blending station system named by-pass blending station (BBS) has been developed to reduce building pump energy consumption in both district heating and cooling systems. Theoretical investigation demonstrated that the BBS can...

  20. Fact #816: February 10, 2014 Natural Gas Refueling Stations Grow...

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

    6: February 10, 2014 Natural Gas Refueling Stations Grow Over the Last Ten Years Fact 816: February 10, 2014 Natural Gas Refueling Stations Grow Over the Last Ten Years In 2003...

  1. Enhancement of tunnel magnetoresistance in magnetic tunnel junction by a superlattice barrier

    SciTech Connect (OSTI)

    Chen, C. H.; Hsueh, W. J., E-mail: hsuehwj@ntu.edu.tw [Nanomagnetism Group, Department of Engineering Science and Ocean Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei 10660, Taiwan (China)

    2014-01-27T23:59:59.000Z

    Tunnel magnetoresistance of magnetic tunnel junction improved by a superlattice barrier composed of alternate layers of a nonmagnetic metal and an insulator is proposed. The forbidden band of the superlattice is used to predict the low transmission range in the superlattice barrier. By forbidding electron transport in the anti-parallel configuration, the tunnel magnetoresistance is enhanced in the superlattice junction. The results show that the tunnel magnetoresistance ratio for a superlattice magnetic tunnel junction is greater than that for traditional single or double barrier junctions.

  2. Superconducting qubit without Josephson junctions manipulated by orbital angular momentum of light

    E-Print Network [OSTI]

    Sang Jae Yun

    2015-05-16T23:59:59.000Z

    Previous superconducting qubits have used Josephson junctions as an essential part which gives anharmonicity to make well-separated energy-level spacings. However, since a superconductor ring without Josephson junctions has intrinsically well-separated energy-level spacings, Josephson junctions are not necessary as long as one can achieve single-qubit operations. We show that orbital angular momentum (OAM) of light can be adopted as a qubit-control means and can eliminate the need of Josephson junctions. We provide theoretical analysis for the interaction between a superconducting ring and OAM of light. Feasibility study reveals that the proposed qubit has many advantages over the previous ones.

  3. Comment on "Analysis of quantum coherent semiconductor quantum dot p-i-n junction photovoltaic cells"

    E-Print Network [OSTI]

    Scully, Marlan O

    2010-01-01T23:59:59.000Z

    This is a comment on PRL paper by A.P. Kirk "Analysis of quantum coherent semiconductor quantum dot p-i-n junction photovoltaic cells"

  4. air station project: Topics by E-print Network

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

    Dryer space Mladenoff, David 23 NOAA Pacific Marine Environmental Laboratory Ocean Climate Stations Project Environmental Sciences and Ecology Websites Summary:...

  5. Central Station DHC Phase 1 feasibility

    SciTech Connect (OSTI)

    Henderson, H.L.

    1992-03-01T23:59:59.000Z

    This project assisted a private real estate developer in technically assessing the feasibility of integrating a central DHC system into a proposed 72 acre area mixed-use Planned Development (Central Station) just south of the Chicago Central Business District (Loop). The technical assessment concluded that a district heating and cooling system for Central Station will be feasible, provided that a major anchor load can be connected to the system. The system conceived for the site employs a modular approach that adjusts production capacity to actual load growth. The design concept includes gas-fired boilers for heating, gas turbine driven chillers for base loading, electric motor driven chillers for peaking, steam turbines for peak power and back pressure operation, and chilled water storage. Energy will be supplied to the users in the form of steam or low temperature hot water for heating, and low temperature chilled water for cooling.

  6. Improving Unit Operations-Test Station Performance

    E-Print Network [OSTI]

    Filak, J. J. Jr.

    IMPROVING UNIT OPERATIONS - TEST STATION PERFORMANCE JosqIb 1. Filak. Jr, ? Corporate Energy Manager. Park.er?Hannafin COfpontioo- Cleveland. Oh ABSTRACT: This program's basic concept deals with the possibilities for reducing energy efficiency... requirements, control operation test performance functions more successfully, and retain peak load surges from reaching higher utility rate expense levels. 142 ESL-IE-95-04-23 Proceedings from the Seventeenth Industrial Energy Technology Conference...

  7. Xcel Energy Comanche Station: Pueblo, Colorado (Data)

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

    Stoffel, T.; Andreas, A.

    A partnership with industry and U.S. Department of Energy's National Renewable Energy Laboratory (NREL) to collect solar data to support future solar power generation in the United States. The measurement station monitors global horizontal, direct normal, and diffuse horizontal irradiance to define the amount of solar energy that hits this particular location. The solar measurement instrumentation is also accompanied by meteorological monitoring equipment to provide scientists with a complete picture of the solar power possibilities.

  8. Small SDI battle stations - More is better

    SciTech Connect (OSTI)

    Cornet, E.

    1986-09-01T23:59:59.000Z

    It is presently suggested that large numbers of lower capability SDI systems, in contrast to small numbers of large battle stations, offer better overall defense performance at lower total cost, with lower technical risk, lower sensitivity to threat scenario variability, and improved survivability. This follows from such factors as the positioning of more platforms within effective range of targets during all phases of an attack, less exacting optics requirements, mass production economies-of-scale, and improved survivability.

  9. Manuel pour installer une station sismologique OSIRIS

    E-Print Network [OSTI]

    Perrot, Julie

    installation Tout d'abord, enterrer le sismom`etre, s'assurer de l'horizontalit´e du sismo c'est-`a-dire, bulle le c^able sur le sismo, v´erifier de nouveau l'horizontalit´e. GPS Batterie ` Station d "sismo" puis cd osiris puis ./nrtd -set eth0 #12;7- Lancer Firefox (web browser) depuis la barre de menu

  10. Plug-In Electric Vehicle Handbook for Public Charging Station Hosts (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2012-04-01T23:59:59.000Z

    This handbook answers basic questions about plug-in electric vehicles, charging stations, charging equipment, and considerations for station owners, property owners, and station hosts.

  11. Competitive Charging Station Pricing for Plug-in Electric Vehicles

    E-Print Network [OSTI]

    Huang, Jianwei

    . To overcome this challenge, we develop a low-complexity algorithm that efficiently computes the pricingCompetitive Charging Station Pricing for Plug-in Electric Vehicles Wei Yuan, Member, IEEE, Jianwei considers the problem of charging station pricing and station selection of plug-in electric vehicles (PEVs

  12. "Space Station" Theme: Learning to Work, and Live, in Space

    E-Print Network [OSTI]

    Mathis, Wayne N.

    "Space Station" IMAX Film Theme: Learning to Work, and Live, in Space The educational value of NASM visit and afterward. See the "Alignment with Standards" table for details regarding how "Space Station in the "Space Station" program: · How astronauts train · What it is like to live and work in Space aboard

  13. Antenna unit and radio base station therewith

    DOE Patents [OSTI]

    Kuwahara, Mikio; Doi, Nobukazu; Suzuki, Toshiro; Ishida, Yuji; Inoue, Takashi; Niida, Sumaru

    2007-04-10T23:59:59.000Z

    Phase and amplitude deviations, which are generated, for example, by cables connecting an array antenna of a CDMA base station and the base station, are calibrated in the baseband. The base station comprises: an antenna apparatus 1; couplers 2; an RF unit 3 that converts a receive signal to a baseband signal, converts a transmit signal to a radio frequency, and performs power control; an A/D converter 4 for converting a receive signal to a digital signal; a receive beam form unit 6 that multiplies the receive signal by semi-fixed weight; a despreader 7 for this signal input; a time-space demodulator 8 for demodulating user data; a despreader 9 for probe signal; a space modulator 14 for user data; a spreader 13 for user signal; a channel combiner 12; a Tx calibrater 11 for controlling calibration of a signal; a D/A converter 10; a unit 16 for calculation of correlation matrix for generating a probe signal used for controlling an Rx calibration system and a TX calibration system; a spreader 17 for probe signal; a power control unit 18; a D/A converter 19; an RF unit 20 for probe signal; an A/D converter 21 for signal from the couplers 2; and a despreader 22.

  14. Evaluation of static mixer flow enhancements for cryogenic viscous compressor prototype for ITER vacuum system

    SciTech Connect (OSTI)

    Duckworth, Robert C.; Baylor, Larry R.; Meitner, Steven J.; Combs, Stephen K.; Ha, Tam; Morrow, Michael; Biewer, T. [Fusion and Materials for Nuclear System Division, Oak Ridge National Laboratory, Oak Ridge (United States); Rasmussen, David A.; Hechler, Michael P. [U.S. ITER Project Office, Oak Ridge National Laboratory, Oak Ridge (United States); Pearce, Robert J. H.; Dremel, Mattias [ITER Organization, 13115 St. Paul-lez-Durance (France); Boissin, J.-C. [Consultant, Grenoble (France)

    2014-01-29T23:59:59.000Z

    As part of the U.S. ITER contribution to the vacuum systems for the ITER fusion project, a cryogenic viscous compressor (CVC) is being designed and fabricated to cryopump hydrogenic gases in the torus and neutral beam exhaust streams and to regenerate the collected gases to controlled pressures such that they can be mechanically pumped with controlled flows to the tritium reprocessing facility. One critical element of the CVC design that required additional investigation was the determination of flow rates of the low pressure (up to 1000 Pa) exhaust stream that would allow for complete pumping of hydrogenic gases while permitting trace levels of helium to pass through the CVC to be pumped by conventional vacuum pumps. A sub-scale prototype test facility was utilized to determine the effectiveness of a static mixer pump tube concept, which consisted of a series of rotated twisted elements brazed into a 2-mm thick, 5-cm diameter stainless steel tube. Cold helium gas flow provided by a dewar and helium transfer line was used to cool the exterior of the static mixer pump tube. Deuterium gas was mixed with helium gas through flow controllers at different concentrations while the composition of the exhaust gas was monitored with a Penning gauge and optical spectrometer to determine the effectiveness of the static mixer. It was found that with tube wall temperatures between 6 K and 9 K, the deuterium gas was completely cryopumped and only helium passed through the tube. These results have been used to design the cooling geometry and the static mixer pump tubes in the full-scale CVC prototype.

  15. Evaluation of Static Mixer Flow Enhancements for Cryogenic Viscous Compressor Prototype for ITER Vacuum System

    SciTech Connect (OSTI)

    Duckworth, Robert C [ORNL] [ORNL; Baylor, Larry R [ORNL] [ORNL; Meitner, Steven J [ORNL] [ORNL; Combs, Stephen Kirk [ORNL] [ORNL; Ha, Tam T [ORNL] [ORNL; Morrow, Michael [ORNL] [ORNL; Biewer, Theodore M [ORNL] [ORNL; Rasmussen, David A [ORNL] [ORNL; Hechler, Michael P [ORNL] [ORNL; Pearce, R.J.H. [ITER Organization, Cadarache, France] [ITER Organization, Cadarache, France; Dremel, M. [ITER Organization, Cadarache, France] [ITER Organization, Cadarache, France; Boissin, Jean Claude [Consultant] [Consultant

    2014-01-01T23:59:59.000Z

    As part of the U.S. ITER contribution to the vacuum systems for the ITER fusion project, a cryogenic viscous compressor (CVC) is being designed and fabricated to cryopump hydrogenic gases in the torus and neutral beam exhaust streams and to regenerate the collected gases to controlled pressures such that they can be mechanically pumped with controlled flows to the tritium reprocessing facility. One critical element of the CVC design that required additional investigation was the determination of flow rates of the low pressure (50 to 1000 Pa) exhaust stream that would allow for complete pumping of hydrogenic gases while permitting trace levels of helium to pass through the CVC to be pumped by conventional vacuum pumps. A sub-scale prototype test facility was utilized to determine the effectiveness of a static mixer pump tube concept, which consisted of a series of rotated twisted elements brazed into a 2-mm thick, 5-cm diameter stainless steel tube. Cold helium gas flow provided by a dewar and helium transfer line was used to cool the exterior of the static mixer pump tube. Deuterium gas was mixed with helium gas through flow controllers at different concentrations while the composition of the exhaust gas was monitored with a Penning gauge and optical spectrometer to determine the effectiveness of the static mixer. It was found that with tube wall temperatures between 6 K and 9 K, the deuterium gas was completely cryopumped and only helium passed through the tube. These results have been used to design the cooling geometry and the static mixer pump tubes in the full-scale CVC prototype

  16. Iron Junction, Minnesota: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are8COaBulkTransmissionSitingProcess.pdfGetecGtelInterias Solar Energy JumpIrem Geothermal Power PlantUtah:Junction,

  17. Monmouth Junction, New Jersey: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant JumpMarysville,Missoula, Montana:Northeast Asia | Open EnergyMongoliaJunction, New

  18. Kansas City`s Union Station redevelopment opportunity -- Environmental challenges

    SciTech Connect (OSTI)

    Snyder, M.G. [Black and Veatch Waste Science, Inc., Overland Park, KS (United States); Scott, A. [Union Station Assistance Corp., Kansas City, MO (United States)

    1995-12-31T23:59:59.000Z

    Kansas City`s Union Station, located at the center of a 1.7 million metropolitan population, is the second largest train station in the United States. The Station ceased to operate as a train station in 1983 and has since been falling into an increasing state of disrepair. This paper provides an insight into ``brownfield`` redevelopment and renovation for adaptive reuse of major turn of the century facilities such as Union Station. Substantial assessment and investigation activities have been conducted at Union Station for compliance and corrective action under RCRA, TSCA, and associated state regulations encompassing remediation estimated at more than $3 million. Recognized environmental conditions identified at Union Station included potential underground storage tanks; solid wastes, special wastes, and potentially hazardous wastes located inside the building; free liquids in sumps and elevator pits; asbestos-containing materials; lead-based paint; and potential for soil contamination on the surrounding property.

  19. 11-14 An ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid is considered. The rate of heat removal from the refrigerated space, the power input to the compressor, the rate of heat rejection to the environment,

    E-Print Network [OSTI]

    Kostic, Milivoje M.

    to the compressor, the rate of heat rejection to the environment, and the COP are to be determined. Assumptions 1 enters the compressor as a saturated vapor at the evaporator pressure, and leaves the condenser space and the power input to the compressor are determined from s and ( ) ( )( ) ( ) ( )( ) kW1.83 kW7

  20. Inverted GaInP/(In)GaAs/InGaAs Triple-Junction Solar Cells with Low-Stress Metamorphic Bottom Junctions: Preprint

    SciTech Connect (OSTI)

    Geisz, J. F.; Kurtz, S. R.; Wanlass, M. W.; Ward, J. S.; Duda, A.; Friedman, D. J.; Olson, J. M.; McMahon, W. E.; Moriarty, T. E.; Kiehl, J. T.; Romero, M. J.; Norman, A. G.; Jones, K. M.

    2008-05-01T23:59:59.000Z

    We demonstrate high efficiency performance in two ultra-thin, Ge-free III-V semiconductor triple-junction solar cell device designs grown in an inverted configuration. Low-stress metamorphic junctions were engineered to achieve excellent photovoltaic performance with less than 3 x 106 cm-2 threading dislocations. The first design with band gaps of 1.83/1.40/1.00 eV, containing a single metamorphic junction, achieved 33.8% and 39.2% efficiencies under the standard one-sun global spectrum and concentrated direct spectrum at 131 suns, respectively. The second design with band gaps of 1.83/1.34/0.89 eV, containing two metamorphic junctions achieved 33.2% and 40.1% efficiencies under the standard one-sun global spectrum and concentrated direct spectrum at 143 suns, respectively.

  1. Photovoltaic nanopillar radial junction diode architecture enhanced by integrating semiconductor quantum dot nanocrystals as light harvesters

    E-Print Network [OSTI]

    Demir, Hilmi Volkan

    Photovoltaic nanopillar radial junction diode architecture enhanced by integrating semiconductor hybridized, radial p-n junction based, nanopillar solar cells with photovoltaic performance enhanced. By furnishing Si based nanopillar photovoltaic diodes with CdSe quantum dots, we experimentally showed up

  2. Reliability of normal-state currentvoltage characteristics as an indicator of tunnel-junction barrier quality

    E-Print Network [OSTI]

    Rabson, David A.

    Department of Physics, PHY 114, University of South Florida, Tampa, Florida 33620 Received 21 April 2000 conductance below Tc , we divide samples into junctions with an integral barrier and junctions having metallic pinholes in the barrier. © 2000 American Institute of Physics. S0003-6951 00 01138-4 Ferromagnet

  3. Low temperature junction growth using hot-wire chemical vapor deposition

    DOE Patents [OSTI]

    Wang, Qi; Page, Matthew; Iwaniczko, Eugene; Wang, Tihu; Yan, Yanfa

    2014-02-04T23:59:59.000Z

    A system and a process for forming a semi-conductor device, and solar cells (10) formed thereby. The process includes preparing a substrate (12) for deposition of a junction layer (14); forming the junction layer (14) on the substrate (12) using hot wire chemical vapor deposition; and, finishing the semi-conductor device.

  4. C-V Profiling of Ultrashallow Junctions using a Step-Like Background Doping Profile

    E-Print Network [OSTI]

    Technische Universiteit Delft

    C-V Profiling of Ultrashallow Junctions using a Step-Like Background Doping Profile Milos Popadi, Delft, The Netherlands m.popadic@tudelft.nl Abstract--A novel C-V profiling method that enables profiling of ultrashallow and ultra-abrupt junctions is described. The method takes advantage of a peculiar

  5. Tight JunctionAssociated Signaling Pathways Modulate Cell Proliferation in Uveal Melanoma

    E-Print Network [OSTI]

    Tight Junction­Associated Signaling Pathways Modulate Cell Proliferation in Uveal Melanoma Ashwath the role of tight junction (TJ)­associ- ated signaling pathways in the proliferation of uveal melanoma. METHODS. Human uveal melanoma cell lines overexpressing the TJ molecule blood vessel epicardial substance

  6. A new junction termination technique: the Deep Trench Termination (DT2

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A new junction termination technique: the Deep Trench Termination (DT2 ) L. Théolier1,2 , H. Mahfoz. In this work, a new concept of low cost, low surface and high efficiency junction termination for power devices is presented and experimentally validated. This termination is based on a large and deep trench filled by BCB

  7. Efficient broadband energy transfer via momentum matching at hybrid junctions of guided-waves

    E-Print Network [OSTI]

    Efficient broadband energy transfer via momentum matching at hybrid junctions of guided://apl.aip.org/about/rights_and_permissions #12;Efficient broadband energy transfer via momentum matching at hybrid junctions of guided, The American University in Cairo, New Cairo 11835, Egypt (Received 2 August 2012; accepted 5 September 2012

  8. OPTIMIZATION OF a-SiGe BASED TRIPLE, TANDEM AND SINGLE-JUNCTION SOLAR Xunming Deng

    E-Print Network [OSTI]

    Deng, Xunming

    OPTIMIZATION OF a-SiGe BASED TRIPLE, TANDEM AND SINGLE-JUNCTION SOLAR CELLS Xunming Deng Department cells, all employing high- quality a-SiGe cells, are reviewed in this paper. Incorporating various improvements in device fabrication, the UT group fabricated 1) triple-junction a-Si/a-SiGe/a- SiGe solar cells

  9. Gallium phosphide high-temperature bipolar junction transistor

    SciTech Connect (OSTI)

    Zipperian, T.E.; Dawson, L.R.; Caffin, R.J.

    1981-03-01T23:59:59.000Z

    Preliminary results are reported on the development of a high-temperature (> 350/sup 0/C) gallium phosphide bipolar junction transistor (BJT) for goethermal and other energy applications. This four-layer p/sup +/n/sup -/pp/sup +/ structure was fromed by liquid phase epitaxy using a supercooling technique to insure uniform nucleation of the thin layers. Magnesium was used as the p-type dopant to avoid excessive out-diffusion into the lightly doped base. By appropriate choice of electrodes, the device may also be driven as an n-channel junction field-effect transistor. The gallium phosphide BJT is observed to have a common-emitter current gain peaking in the range of 6 to 10 (for temperatures from 20/sup 0/C to 400/sup 0/C) and a room-temperature, punchthrough-limited, collector-emitter breakdown voltage of approximately -6V. Other parameters of interest include an f/sub/ = 400 KHz (at 20/sup 0/C) and a collector base leakage current = 200 ..mu..A (at 350/sup 0/C).

  10. Repowering of the Midland Nuclear Station

    E-Print Network [OSTI]

    Gatlin, C. E. Jr.; Vellender, G. C.; Mooney, J. A.

    natural gas-fired cx:rnbined~cle plant ~~on utilized the original Midland Unit 1 steam turb~ am 12 gas t:w:bine heat recovery trains to prov de 1,165 MW of generatin;J capacity. 'Ihi.s ~ on included a staged approach to stagger availability of the ad... the largest cogeneration facility in the United States. The paper describes the project and the converted facility. 'Ibe Midland Cogeneration Plant started as a 2-unit nuclear-powered electric generating station supplyin;J cogenerated steam to an adjacent...

  11. Polk power station syngas cooling system

    SciTech Connect (OSTI)

    Jenkins, S.D.

    1995-01-01T23:59:59.000Z

    Tampa Electric Company (TEC) is in the site development and construction phase of the new Polk Power Station Unit No. 1. This will be the first unit at a new site and will use Integrated Gasification Combined Cycle (IGCC) Technology. The unit will utilize Texaco`s oxygen-blown, entrained-flow coal gasification, along with combined cycle power generation, to produce nominal 260MW. Integral to the gasification process is the syngas cooling system. The design, integration, fabrication, transportation, and erection of this equipment have provided and continue to provide major challenges for this project.

  12. Hellisheidi Geothermal Power Station | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are8COaBulkTransmissionSitingProcess.pdfGetec AG|InformationInformation Station - South Iceland Jump

  13. Schiller Station Biomass Facility | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-f < RAPID‎ |Rippey JumpAir Jump to: navigation,Delta Jump to:Station

  14. Early Station Costs Questionnaire | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) 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 DataDepartment of Energy Your Density Isn't Your Destiny:RevisedAdvisory Board Contributions EMEMEnergyEarly Station Costs Questionnaire

  15. Tianlin Baxin Hydropower Station | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit withTianlin Baxin Hydropower Station Jump to: navigation, search Name: Tianlin

  16. Alternative Fuels Data Center: Hydrogen Fueling Stations

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWP TWP RelatedCellulase C.Tier 2NorthAvailabilityBasicsFueling Stations

  17. Rancia Geothermal Power Station | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries Pvt Ltd Jump to: navigation, search Name:Rancia 2 Geothermal Power Station Jump

  18. Report on Experiments with Citrus Fruits at the Beeville Sub-station.

    E-Print Network [OSTI]

    Potts, A. T. (Arthur Tillman)

    1912-01-01T23:59:59.000Z

    !TEXAS AGRICULTURAL EXPERIMENT STATIONS BULLETIN No. 148. MAY, 1912. Report on Experiments With Citrus Fruits at The Bee- ville Sub-station A. T. POTTS, Superintendent Beeville Sub-station AUSTIN PRINTING COMPANY AUSTIN. TEXAS TEXAS... EXPERIMENT STATIONS. GOVERNING BOARD. 1 DIRECTOR OF STATIONS. ...................................... B. YOUNOBLOOD, M. S.. .College Station I SUPERINTENDENTS OF SUB-STATIONS. .................. E. E. BINFORD, Beeville Sub-station.. .Beeville, P:.e Cc...

  19. Josephson junction of non-Abelian superconductors and non-Abelian Josephson vortices

    E-Print Network [OSTI]

    Nitta, Muneto

    2015-01-01T23:59:59.000Z

    A Josephson junction is made of two superconductors sandwiching an insulator, and a Josephson vortex is a magnetic vortex absorbed into the Josephson junction, whose dynamics can be described by the sine-Gordon equation. In a field theory framework, a flexible Josephson junction was proposed, in which the Josephson junction is represented by a domain wall separating two condensations and a Josephson vortex is a sine-Gordon soliton in the domain wall effective theory. In this paper, we propose a Josephson junction of non-Abelian color superconductors, that is described by a non-Abelian domain wall, and show that a non-Abelian vortex (color magnetic flux tube) absorbed into it is a non-Abelian Josephson vortex represented as a non-Abelian sine-Gordon soliton in the domain wall effective theory.

  20. Polymer / Elastomer and Composite Material Science

    E-Print Network [OSTI]

    compressors at the delivery station Hydrogen delivery systems to end use vehicles Quick fill rates High