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1

Advanced Variable Speed Air-Source Integrated Heat Pump 2013...  

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

Advanced Variable Speed Air-Source Integrated Heat Pump 2013 Peer Review Advanced Variable Speed Air-Source Integrated Heat Pump 2013 Peer Review Emerging Technologies Project for...

2

Building Technologies Office: Advanced, Variable Speed Air-Source  

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

Advanced, Variable Advanced, Variable Speed Air-Source Integrated Heat Pumps Research Project to someone by E-mail Share Building Technologies Office: Advanced, Variable Speed Air-Source Integrated Heat Pumps Research Project on Facebook Tweet about Building Technologies Office: Advanced, Variable Speed Air-Source Integrated Heat Pumps Research Project on Twitter Bookmark Building Technologies Office: Advanced, Variable Speed Air-Source Integrated Heat Pumps Research Project on Google Bookmark Building Technologies Office: Advanced, Variable Speed Air-Source Integrated Heat Pumps Research Project on Delicious Rank Building Technologies Office: Advanced, Variable Speed Air-Source Integrated Heat Pumps Research Project on Digg Find More places to share Building Technologies Office: Advanced,

3

Advanced Variable Speed Air-Source Integrated Heat Pump | Department...  

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

Integrated Heat Pump prototype system and field test site near Knoxville, TN Credit: Oak Ridge National Lab Advanced variable-speed Air Source Integrated Heat Pump prototype...

4

Advanced Variable Speed Air-Source Integrated Heat Pump  

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

variable speed air-source variable speed air-source integrated heat pump (AS-IHP) - CRADA Van D. Baxter Oak Ridge National Laboratory vdb@ornl.gov; 865-574-2104 April 3, 2013 Development of advanced HVAC/WH system options for efficient residential or small commercial buildings, new const. or retrofit * ET R&D project in support of DOE/BTO Goal of 50% Reduction in Building Energy Use by 2030 IHP concept - all HVAC & WH services integrated into

5

Advanced Variable Speed Air-Source Integrated Heat Pump  

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

variable speed air-source variable speed air-source integrated heat pump (AS-IHP) - CRADA Van D. Baxter Oak Ridge National Laboratory vdb@ornl.gov; 865-574-2104 April 3, 2013 Development of advanced HVAC/WH system options for efficient residential or small commercial buildings, new const. or retrofit * ET R&D project in support of DOE/BTO Goal of 50% Reduction in Building Energy Use by 2030 IHP concept - all HVAC & WH services integrated into

6

Advanced Variable Speed Air-Source Integrated Heat Pumps Research Project |  

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

Advanced Variable Speed Air-Source Advanced Variable Speed Air-Source Integrated Heat Pumps Research Project Advanced Variable Speed Air-Source Integrated Heat Pumps Research Project The U.S. Department of Energy is currently conducting research into advanced variable speed air-source integrated heat pumps (AS-IHPs). Project Description This project seeks to develop AS-IHP products for the larger air-source system market. Development focuses on a fully variable capacity or variable speed AS-IHP option. Project Partners Research is being undertaken through a cooperative research and development agreement (CRADA) between the Department of Energy, Oak Ridge National Laboratory, and a CRADA partner. Project Goals The goal of this project is the development of a fully variable-speed version of an AS-IHP product that can provide heating, ventilation, and air

7

Performance Analysis of Air-Source Variable Speed Heat Pumps and Various Electric Water Heating Options  

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

Analysis of Air- Analysis of Air- Source Variable Speed Heat Pumps and Various Electric Water Heating Options Jeffrey Munk Oak Ridge National Laboratory 2 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Acknowledgements * Tennessee Valley Authority - David Dinse * U.S. Department of Energy * Roderick Jackson * Tony Gehl * Philip Boudreaux * ZEBRAlliance 3 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Overview * Electric Water Heating Options - Conventional Electric Water Heaters - Heat Pump Water Heaters * Air-Source * Ground-Source - Solar Thermal Water Heater * Variable Speed Heat Pumps - Energy Use Analysis - Measured Performance - Operational Characteristics 4 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Water Heating Options

8

Chapter Seven - Variable speed drives  

Science Journals Connector (OSTI)

Publisher Summary The electromechanical controllers are a kind of variable speed drives (VSDs) that are obsolete but are still in use because when a motor and a drive is combined, they become a power drive system (PDS). There are two ways of varying the speed of an induction motor, either by varying the motor slip or by varying the supply frequency. The preferred practice for electrical speed variation is to change the supply frequency with a variable frequency drive (VFD). Many other designs also have been developed. However, except the specialized applications, few are still in operation. A number of motor and drive manufacturers are now producing the integrated motor/VFD units. These units consist of a motor and a specially designed VFD, produced as a single package, with the VFD unit mounted variously on the top, side, or end of the motor.

Europump; Hydraulic Institute

2005-01-01T23:59:59.000Z

9

Performance Analysis of Air-Source Variable Speed Heat Pumps and Various Electric Water Heating Options  

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

This presentation was delivered at the U.S. Department of Energy Building America Technical Update meeting on April 29-30, 2013, in Denver, Colorado.

10

Renewable variable speed hybrid system   

E-Print Network (OSTI)

At present many remote and Island communities rely solely on diesel powered generators to provide electricity. Diesel fuel is both expensive and polluting and the constant speed operation of the diesel engine is inefficient. ...

Stott, Paul Anthony

2010-01-01T23:59:59.000Z

11

Solutions for Interharmonics in Variable Speed Drives for LNG Plants:.  

E-Print Network (OSTI)

??Variable speed drives can cause components of any frequency known as interharmonics. Large variable speed drives in the order of tens of megawatts can replace… (more)

Verhulst, M.P.A.

2011-01-01T23:59:59.000Z

12

Variable Speed of Light Research Project Dave Schumann  

E-Print Network (OSTI)

Variable Speed of Light Research Project Dave Schumann Dr. Bharath Narayanan 21 September 2003 mathematics of the Variable Speed of Light (VSL) theory. In a paper titled, "A Time Varying Speed of Light of a variable speed of light in the early stages of the universe. They propose corrections to the cosmological

Zakharov, Vladimir

13

Pitch and torque control of variable speed wind turbines.  

E-Print Network (OSTI)

??In this thesis the torque, speed and pitch angle control of variable speed wind turbine is investigated. In particular, it concentrates on the extraction of… (more)

Kulka, Arkadiusz

2004-01-01T23:59:59.000Z

14

Thermodynamics in variable speed of light theories  

SciTech Connect

The perfect fluid in the context of a covariant variable speed of light theory proposed by J. Magueijo is studied. On the one hand the modified first law of thermodynamics together with a recipe to obtain equations of state are obtained. On the other hand the Newtonian limit is performed to obtain the nonrelativistic hydrostatic equilibrium equation for the theory. The results obtained are used to determine the time variation of the radius of Mercury induced by the variability of the speed of light (c), and the scalar contribution to the luminosity of white dwarfs. Using a bound for the change of that radius and combining it with an upper limit for the variation of the fine structure constant, a bound on the time variation of c is set. An independent bound is obtained from luminosity estimates for Stein 2015B.

Racker, Juan [CONICET, Centro Atomico Bariloche, Avenida Bustillo 9500 (8400), San Carlos De Bariloche (Argentina); Facultad de Ciencias Astronomicas y Geofisicas, Universidad Nacional de La Plata, Paseo del Bosque S/N (1900), La Plata (Argentina); Sisterna, Pablo [Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350 (7600), Mar del Plata (Argentina); Vucetich, Hector [Facultad de Ciencias Astronomicas y Geofisicas, Universidad Nacional de La Plata, Paseo del Bosque S/N (1900), La Plata (Argentina)

2009-10-15T23:59:59.000Z

15

Thermodynamics in variable speed of light theories  

E-Print Network (OSTI)

The perfect fluid in the context of a covariant variable speed of light theory proposed by J. Magueijo is studied. On the one hand the modified first law of thermodynamics together with a recipe to obtain equations of state are obtained. On the other hand the Newtonian limit is performed to obtain the nonrelativistic hydrostatic equilibrium equation for the theory. The results obtained are used to determine the time variation of the radius of Mercury induced by the variability of the speed of light ($c$), and the scalar contribution to the luminosity of white dwarfs. Using a bound for the change of that radius and combining it with an upper limit for the variation of the fine structure constant, a bound on the time variation of $c$ is set. An independent bound is obtained from luminosity estimates for Stein 2015B.

Juan Racker; Pablo Sisterna; Hector Vucetich

2007-11-06T23:59:59.000Z

16

Globally competitive variable-speed wind turbines  

SciTech Connect

This paper focuses on the design issues which must be addressed if variable-speed wind turbines are to compete in the global marketplace. The paper examines how component-specific design decisions must be made on a system level if an optimized system is to be the result. The relationships among the blades, the generator and the utility interface are considered in detail, using the conceptual design of a 12 kW variable-speed wind turbine (the AOC 8/12) as a running example. The turbine is based on a direct-drive variable-reluctance generator (VRG), a single- or three-phase utility interface as appropriate, and a three-bladed rotor with fixed pitch. A preliminary turbine specification is provided, along with candidate power-speed curves and annual energy output. This paper documents the continuing development and commercialization of this technology which is being taken from the proof-of-concept stage and is now headed for field testing.

Torrey, D.A. [Rensselaer Polytechnic Institute, Troy, NY (United States); Childs, S.E.; Johnson, B.; Carter, J. [Atlantic Orient Corp., Norwich, VT (United States)

1995-12-31T23:59:59.000Z

17

Chi-Variable-Speed-of-Light Cosmologies  

E-Print Network (OSTI)

Variable-Speed-of-Light (VSL) cosmologies are currently attracting much interest as a possible alternative to cosmological inflation. We discuss the fundamental geometrodynamic aspects of VSL cosmologies, and provide several alternative implementations. These implementations provide a large class of VSL cosmologies that pass the zeroth-order consistency tests of being compatible with both classical Einstein gravity and low-energy particle physics. While they solve the ``kinematic'' puzzles as well as inflation does, VSL cosmologies typically do not solve the flatness problem since in their purest form no violation of the strong energy condition occurs. Nevertheless, these models are easy to unify with inflation.

Stefano Liberati; Bruce A. Bassett; Carmen Molina-Paris; Matt Visser

2000-01-27T23:59:59.000Z

18

Cloud speed impact on solar variability scaling â?? Application to the wavelet variability model  

E-Print Network (OSTI)

Kleissl, J. , 2013. Deriving cloud velocity from an array ofCloud Speed Impact on Solar Variability Scaling -this work, we determine from cloud speeds. Cloud simulator

Lave, Matthew; Kleissl, Jan

2013-01-01T23:59:59.000Z

19

Variable current speed controller for eddy current motors  

DOE Patents (OSTI)

A speed control system for eddy current motors is provided in which the current to the motor from a constant frequency power source is varied by comparing the actual motor speed signal with a setpoint speed signal to control the motor speed according to the selected setpoint speed. A three-phase variable voltage autotransformer is provided for controlling the voltage from a three-phase power supply. A corresponding plurality of current control resistors is provided in series with each phase of the autotransformer output connected to inputs of a three-phase motor. Each resistor is connected in parallel with a set of normally closed contacts of plurality of relays which are operated by control logic. A logic circuit compares the selected speed with the actual motor speed obtained from a digital tachometer monitoring the motor spindle speed and operated the relays to add or substract resistance equally in each phase of the motor input to vary the motor current to control the motor at the selected speed.

Gerth, H.L.; Bailey, J.M.; Casstevens, J.M.; Dixon, J.H.; Griffith, B.O.; Igou, R.E.

1982-03-12T23:59:59.000Z

20

Best Practices for Energy Efficient Cleanrooms: Variable Speed Pumping  

E-Print Network (OSTI)

efficiency of chilled water and condenser pumps, along with chiller efficiency and cooling tower efficiency, operate, and control water-pumping systems to achieve high efficiency and to lower life-cycle costsLBNL-58637 Best Practices for Energy Efficient Cleanrooms: Variable Speed Pumping Tengfang Xu June

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


21

Pitch-Controlled Variable-Speed Wind Turbine Generation  

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

Pitch-Controlled Variable-Speed Pitch-Controlled Variable-Speed Wind Turbine Generation February 2000 * NREL/CP-500-27143 E. Muljadi and C.P. Butterfield Presented at the 1999 IEEE Industry Applications Society Annual Meeting Phoenix, Arizona October 3-7, 1999 National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute * * * * Battelle * * * * Bechtel Contract No. DE-AC36-99-GO10337 NOTICE The submitted manuscript has been offered by an employee of the Midwest Research Institute (MRI), a contractor of the US Government under Contract No. DE-AC36-99GO10337. Accordingly, the US Government and MRI retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes.

22

Variable Speed Fan Retrofits for Computer Room Air Conditioners  

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

Variable-Speed Fan Variable-Speed Fan Retrofits for Computer-Room Air Conditioners Prepared for the U.S. Department of Energy Federal Energy Management Program Technology Case Study Bulletin By Lawrence Berkeley National Laboratory Steve Greenberg September 2013 2 Contacts Steve Greenberg Lawrence Berkeley National Laboratory One Cyclotron Road, 90R3111 Berkeley, California 94720 (510) 486-6971 segreenberg@lbl.gov For more information on FEMP, please contact: Will Lintner, P.E., CEM Federal Energy Management Program U.S. Department of Energy 1000 Independence Ave. S.W. Washington, D. C. 20585-0121 (202) 586-3120 william.lintner@ee.doe.gov 3 Acknowledgements EPRI: Dennis Symanski, Brian Fortenbery Synapsense: Garret Smith, Patricia Nealon Vigilent: Corinne Vita

23

6 - Control systems for AC variable speed drives  

Science Journals Connector (OSTI)

Publisher Summary This chapter explores the control system, embodied in the control circuits. The simplest method of providing auxiliary power to the converter control circuits is from an auxiliary transformer connected to the mains. The primary need for current feedback in general purpose variable speed drives (VSDs) is inverter switching device protection. Various disadvantages of the vector controlled AC drive as compared to a DC drive are discussed in the chapter. The strategy of an AC vector control drive is to calculate the individual current vectors to eventually enable separate control of the flux current and the torque current under all speed and load conditions. The power circuit for a vector converter is almost identical to that used by a variable voltage variable frequency (VVVF) drive. High accuracy motor current feedback is also necessary to provide control of motor torque. DC bus current feedback is suitable for switching device protection and current limiting in most AC VSDs. Analog speed transducers are increasingly being replaced by digital devices, which are more compatible with modern digital control systems.

Malcolm Barnes

2003-01-01T23:59:59.000Z

24

Performance of twist-coupled blades on variable speed rotors  

SciTech Connect

The load mitigation and energy capture characteristics of twist-coupled HAWT blades that are mounted on a variable speed rotor are investigated in this paper. These blades are designed to twist toward feather as they bend with pretwist set to achieve a desirable twist distribution at rated power. For this investigation, the ADAMS-WT software has been modified to include blade models with bending-twist coupling. Using twist-coupled and uncoupled models, the ADAMS software is exercised for steady wind environments to generate C{sub p} curves at a number of operating speeds to compare the efficiencies of the two models. The ADAMS software is also used to generate the response of a twist-coupled variable speed rotor to a spectrum of stochastic wind time series. This spectrum contains time series with two mean wind speeds at two turbulence levels. Power control is achieved by imposing a reactive torque on the low speed shaft proportional to the RPM squared with the coefficient specified so that the rotor operates at peak efficiency in the linear aerodynamic range, and by limiting the maximum RPM to take advantage of the stall controlled nature of the rotor. Fatigue calculations are done for the generated load histories using a range of material exponents that represent materials from welded steel to aluminum to composites, and results are compared with the damage computed for the rotor without twist-coupling. Results indicate that significant reductions in damage are achieved across the spectrum of applied wind loading without any degradation in power production.

Lobitz, D.W.; Veers, P.S.; Laino, D.J.

1999-12-07T23:59:59.000Z

25

Variable Speed of Light Cosmology, Primordial Fluctuations and Gravitational Waves  

E-Print Network (OSTI)

A variable speed of light (VSL) cosmology is developed with a spontaneous breaking of Lorentz invariance in the early universe. A non-minimal electromagnetic coupling to curvature and the resulting quantum electrodynamic vacuum polarization dispersive medium can produce $c\\gg c_0$ in the early universe, where $c_0$ is the measured speed of light today. Higher derivative curvature contributions to the effective gravitational action and quantum gravity vacuum polarization can produce a dispersive medium and a large increase in the speed of gravitational waves $c_g\\gg c_{g0}$ in the early universe, where $c_{g0}$ is the speed of gravitational waves today. The initial value problems of cosmology are solved: the horizon and flatness problems. The model predicts primordial scalar and tensor fluctuation spectral indices $n_s=0.96$ and $n_t=- 0.04$, respectively. The BICEP2 observation of $r=0.2$ yields $r/n_t=-5$ which is close to the single-field inflationary consistency condition $r/n_t=-8$.

J. W. Moffat

2014-04-20T23:59:59.000Z

26

Variable speed wind turbine generator with zero-sequence filter  

DOE Patents (OSTI)

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility. 14 figs.

Muljadi, E.

1998-08-25T23:59:59.000Z

27

Variable Speed Wind Turbine Generator with Zero-sequence Filter  

DOE Patents (OSTI)

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility.

Muljadi, Eduard (Golden, CO)

1998-08-25T23:59:59.000Z

28

Variable speed wind turbine generator with zero-sequence filter  

DOE Patents (OSTI)

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility.

Muljadi, Eduard (Golden, CO)

1998-01-01T23:59:59.000Z

29

Variable speed wind turbine for maximum power capture using adaptive fuzzy integral sliding mode control  

Science Journals Connector (OSTI)

This paper presents a nonlinear control approach to variable speed wind turbine (VSWT) with a wind speed estimator. The dynamics of the wind turbine (WT) is derived from single ... has been considered for exact e...

Saravanakumar Rajendran…

2014-06-01T23:59:59.000Z

30

Best Practices for Energy Efficient Cleanrooms Efficient HVAC Systems: Variable-Speed-Drive Chillers  

E-Print Network (OSTI)

LBNL-58636 Best Practices for Energy Efficient Cleanrooms Efficient HVAC Systems: Variable Efficient Cleanrooms Efficient HVAC Water Systems: Variable-Speed-Drive Chillers Tengfang Xu Contents HVAC.................................................................................................................................... 6 #12;HVAC Water Systems Variable-Speed-Drive Chillers Summary Cleanroom energy benchmarking data

31

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems  

E-Print Network (OSTI)

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems B. Beltran, T. Ahmed power generation in variable speed wind energy conversion systems (VS-WECS). These systems have two variations. Index Terms--Wind energy conversion system, power generation control, sliding mode control

Boyer, Edmond

32

Energy Efficient Control of a Boosting System with Multiple Variable-Speed Pumps in Parallel  

E-Print Network (OSTI)

with multiple variable-speed pumps in parallel is to minimize the pump system energy consumption by controlEnergy Efficient Control of a Boosting System with Multiple Variable-Speed Pumps in Parallel Zhenyu. The experimental results show a huge potential to improve the energy efficiency of multi-pump systems using

Yang, Zhenyu

33

Special and general relativity extended to allow for a variable light speed  

E-Print Network (OSTI)

There have been a number of papers proposing that the light speed of a homogeneous and isotropic universe is variable. This paper outlines a simple way that the vectors and tensors of special relativity can be extended to allow such a variable light speed and show how the field equation of general relativity can also be extended with particular application to such a universe.

Robert C. Fletcher

2006-06-21T23:59:59.000Z

34

Atmospheric Circulation Effects on Wind Speed Variability at Turbine Height  

Science Journals Connector (OSTI)

Mean monthly wind speed at 70 m above ground level is investigated for 11 sites in Minnesota for the period 1995–2003. Wind speeds at these sites show significant spatial and temporal coherence, with prolonged periods of above- and below-normal ...

Katherine Klink

2007-04-01T23:59:59.000Z

35

Building Technologies Office: Air-Source Integrated Heat Pump Research  

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

Air-Source Integrated Air-Source Integrated Heat Pump Research Project to someone by E-mail Share Building Technologies Office: Air-Source Integrated Heat Pump Research Project on Facebook Tweet about Building Technologies Office: Air-Source Integrated Heat Pump Research Project on Twitter Bookmark Building Technologies Office: Air-Source Integrated Heat Pump Research Project on Google Bookmark Building Technologies Office: Air-Source Integrated Heat Pump Research Project on Delicious Rank Building Technologies Office: Air-Source Integrated Heat Pump Research Project on Digg Find More places to share Building Technologies Office: Air-Source Integrated Heat Pump Research Project on AddThis.com... About Take Action to Save Energy Partner with DOE Activities Appliances Research Building Envelope Research

36

Damage measurements on the NWTC direct-drive, variable-speed test bed  

SciTech Connect

The NWTC (National Wind Technology Center) Variable-Speed Test Bed turbine is a three-bladed, 10-meter, downwind machine that can be run in either fixed-speed or variable-speed mode. In the variable-speed mode, the generator torque is regulated, using a discrete-stepped load bank to maximize the turbine`s power coefficient. At rated power, a second control loop that uses blade pitch to maintain rotor speed essentially as before, i.e., using the load bank to maintain either generator power or (optionally) generator torque. In this paper, the authors will use this turbine to study the effect of variable-speed operation on blade damage. Using time-series data obtained from blade flap and edge strain gauges, the load spectrum for the turbine is developed using rainflow counting techniques. Miner`s rule is then used to determine the damage rates for variable-speed and fixed-speed operation. The results illustrate that the controller algorithm used with this turbine introduces relatively large load cycles into the blade that significantly reduce its service lifetime, while power production is only marginally increased.

Sutherland, H.J. [Sandia National Lab., Albuquerque, NM (United States); Carlin, P.W. [National Renewable Energy Lab., Golden, CO (United States)

1998-12-31T23:59:59.000Z

37

Variable Speed Drive (VSD) Applications in Dual-Duct Constant Volume Systems  

E-Print Network (OSTI)

Models have been developed for static pressure and potential supply fan energy savings by using variable speed drive (VSD) in dual-duct constant volume systems. Experiments have been performed using a full size dual-duct constant volume system...

Joo, I.; Liu, M.; Conger, K.; Wang, G.

2002-01-01T23:59:59.000Z

38

Simplified Modelling and Control of a Synchronous Machine with VariableSpeed SixStep Drive  

E-Print Network (OSTI)

of electrical power flow in the machine. Cost is a driving factor in the design of such a system, and the power frequency than PWM as well. II. VARIABLE­SPEED ELECTRIC MACHINE DRIVES While the choice of driveSimplified Modelling and Control of a Synchronous Machine with Variable­Speed Six­Step Drive

Sanders, Seth

39

Collapse, Expansion, and a Variable Speed of Light  

E-Print Network (OSTI)

This paper presents an information-theoretic view of how an observer within a quantum system will perceive his world. It is argued that because of the indistinguishability of quantum particles, a coherent state will appear to an observer within the system like a singularity. As superposition is lost, space appears to expand, although to the outsider it is merely the collapse of the wave function. Implications of these ideas to cosmology are considered. The superluminal expansion of space provides a basis to understand inflationary cosmologies. This expansion may be taken to be equivalent to a much faster speed of light during the inflationary period. These ideas can be tested by checking for `higher' speed of light from photons emitted by decohering atoms.

Subhash Kak

2001-01-25T23:59:59.000Z

40

Modeling and Experimental Investigation of a Variable Speed Drive Water Source Heat Pump  

Science Journals Connector (OSTI)

Accurate variable speed characteristics are needed for water source heat pumps (WSHP) to design variable speed controls to adjust refrigerant flow rates in heat pumps and air conditioners. The system capacity can then be regulated to match the compressor loads to the heating or cooling needs to improve the energy efficiency and lower energy costs. The motor and compression characteristics of WSHP were modeled to include the coupling between the motor speed and the torque characteristics and compression characteristics. An analytical model is given for a variable speed hermetic scroll compressor that describes various factors, such as the drive frequency, suction pressure, and discharge pressure as a function of the compressor speed. The model was validated experimentally using R22 and \\{R134a\\} in an experimental WSHP with variable speed control using frequency conversion. The results show that the analytical model properly describes the variable speed characteristics and provides a control strategy for adjusting the capacity of scroll compressors to match the heat pump or air conditioner operating conditions.

Zhifang Xue; Lin Shi

2010-01-01T23:59:59.000Z

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


41

Control of a 6/4 switched reluctance motor in a variable speed pumping application  

Science Journals Connector (OSTI)

An original variable-speed pumping system was developed through integrating a power converter, switched reluctance motor (SRM), centrifugal pump, and speed control strategy. A customized power converter and speed control strategy were selected, designed, and implemented to regulate the speed of the SRM-pump system. The control strategy to regulate the speed of the SRM consisted of a digital controller made with PI and phase-lead compensators in series and, simultaneously, adjusting the advanced firing angle as a function of the desired motor speed. It was experimentally demonstrated that the inverter-SRM-pump system is a good option to drive a centrifugal pump with a relatively high efficiency at all speeds.

Horacio Vasquez; Joey Parker; Timothy Haskew

2005-01-01T23:59:59.000Z

42

Air-Source Heat Pump Basics | Department of Energy  

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

Air-Source Heat Pump Basics Air-Source Heat Pump Basics Air-Source Heat Pump Basics August 19, 2013 - 11:03am Addthis Air-source heat pumps transfer heat between the inside of a building and the outside air. How Air-Source Heat Pumps Work This diagram of a split-system heat pump heating cycle shows refrigerant circulating through a closed loop that passes through the wall of a house. Inside the house the refrigerant winds through indoor coils, with a fan blowing across them, and outside the house is another fan and another set of coils, the outdoor coils. A compressor is between the coils on one half of the loop, and an expansion valve is between the coils on the other half. The diagram is explained in the caption. In heating mode, an air-source heat pump evaporates a refrigerant in the outdoor coil; as the liquid evaporates it pulls

43

Integral variable structure current control of DFIG-based wind turbines near cut-in speed  

Science Journals Connector (OSTI)

Based on the grid voltage orientated vector control technique, a novel integral variable structure controller for current control of variable speed doubly fed induction generator (DFIG) wind turbines near cut-in wind speed is proposed. The proposed current controller can not only ensure generators' safe cut-in switches to the grid, but also maximum energy capture after switch motion without any regulations. By these, simulations of a 1.5 MW DFIG-based wind turbine near cut-in wind speed are separately conducted under integral variable structure control (IVSC) and PI control. The results show that IVSC strategy, which gives better dynamic response, less static error, smaller controller output dithering, stronger global robustness against generator parameters uncertainty and the grid voltage fluctuation, as well as needless controller regulation after cutting-in the grid, obviously preponderates over traditional PI control for DFIG-based wind turbines near cut-in speed.

Changliang Xia; Huimin Wang; Zhanfeng Song

2009-01-01T23:59:59.000Z

44

Covered Product Category: Residential Air-Source Heat Pumps  

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

The Federal Energy Management Program (FEMP) provides acquisition guidance for residential air-source heat pumps, which is an ENERGY STAR-qualified product category.

45

Investigation of a Novel Air Source Heat Pump Test Platform.  

E-Print Network (OSTI)

??A flexible air source heat pump testing platform is being developed at the National Renewable Energy Centre that will have the advantages of both a… (more)

Shi, Yuan

2013-01-01T23:59:59.000Z

46

The Impacts of Wind Speed Trends and Long-term Variability in Relation to Hydroelectric  

E-Print Network (OSTI)

The Impacts of Wind Speed Trends and Long- term Variability in Relation to Hydroelectric Reservoir and Long-term Variability in Relation to Hydroelectric Reservoir Inflows on Wind Power in the Pacific through diversification. In hydroelectric dominated systems, like the PNW, the benefits of wind power can

Kohfeld, Karen

47

Air-Source Heat Pumps | Department of Energy  

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

Air-Source Heat Pumps Air-Source Heat Pumps Air-Source Heat Pumps June 24, 2012 - 3:35pm Addthis When properly installed, an air-source heat pump can deliver one-and-a-half to three times more heat energy to a home than the electrical energy it consumes. | Photo courtesy of iStockPhoto/YinYang. When properly installed, an air-source heat pump can deliver one-and-a-half to three times more heat energy to a home than the electrical energy it consumes. | Photo courtesy of iStockPhoto/YinYang. What does this mean for me? If you live in a cooling climate, an air-source heat pump is a good choice. If you live in a heating climate, watch for advanced air-source heat pumps coming on the market that operate well in sub-freezing temperatures. An air-source heat pump can provide efficient heating and cooling for your

48

High-performance prediction for variable-speed switched reluctance drives  

SciTech Connect

This work presents a simple developed nonlinear dynamic model of variable reluctance motor (VRM) based on its magnetic characteristics, considering the saturation effect. Most preliminary design work is centered on a fixed speed, or a small number of fixed speeds, even when the requirement is for operation over a wide speed range. This work deals with both constant and variable speed operation. Model development is motivated by the good performance predictions required to support and simplify the design of a high performance controller. Because the magnetization curves do not need to be pre-calculated, measured, stored, curve-fitted, or idealized the model is extremely simple, fast, and accurate. Simulation results of the phase current and torque on both chopping and single-pulse mode of operations are presented.

Ismail, F. [Cairo Univ. (Egypt); Wahsh, S.; Mohamed, A.Z. [Electronics Research Inst., Giza (Egypt)

1997-12-31T23:59:59.000Z

49

Backstepping control of DFIG generators for wide-range variable-speed wind turbines  

Science Journals Connector (OSTI)

In this paper, we have presented a general study of self excited induction generator used in isolated renewable energy conversion source. Tthe behaviour of generated voltage under variable load, rotor speed and excitation capacitance is presented. Also, we have proposed a robust controller suitable in order to control the terminal DC voltage under different speed and AC load conditions for supplied an isolated DC load. The experimental characteristic curve of the generator and simulation result of proposed control scheme are presented.

Badre Bossoufi; Mohammed Karim; Ahmed Lagrioui; Mohammed Taoussi; Mohamed Larbi ElHafyani

2014-01-01T23:59:59.000Z

50

On Structure and History of Space-time with Variable Speed of Light  

E-Print Network (OSTI)

We apply the variable speed of light into general relativity in order to solve the problems we met in the standard cosmology. We're surprised to find that, the results from the general relativity in cosmology are exactly the same as those we got from Newtonian dynamics. The relation between the Newtonian dynamics and the relativistic dynamics can be demonstrated with the variable speed of light. With this approach, some problems in the standard cosmology such as the flatness problem and the horizon problem doesn't arise any more. All the cosmological results and the physical results are reasonable and natural. There are no any difficulties in the standard cosmology.

Guoyou Huang

2004-10-15T23:59:59.000Z

51

Abstract--The induction motor is well known as the workhorse of industry. The development of variable speed  

E-Print Network (OSTI)

of variable speed induction motor drives has a long history of more than four decades. Today's sophisticated--Induction motor control I. INTRODUCTION EFORE the invention of variable frequency voltage and current source inverters the induction motor was never thought as continuously variable speed drive. Only some adaptations

Paderborn, Universität

52

Analysis of Variable Speed Optimization Operation Effect of Different?type Pumps in Jiangdu Pumping Station  

Science Journals Connector (OSTI)

The following paper puts forward 45 combination schemes of different?type pumps in different daily?average heads and operation loads in Jiangdu Pumping Station. Based on every scheme the minimum electricity consumption cost selected as the objective function this paper gives the results of variable speed optimal operations with dynamic planning methods in both considering time?sharing electricity prices and not simultaneously it gives the results of fixed speed conventional operation considering time?sharing electricity prices. Then according to the unit energy consumption cost the paper gives comparison analysis of the effect of different?type pumps in variable speed optimization operation the conclusions can offer decision?making bases for optimization research of pumping stations considering time?sharing electricity prices and tide levels of Yangtze River and offer references for transformation and economical operation of large and medium?size pumping stations.

Qiu Jinxian; Cheng Jilin; Luo Jinyao; Zhang Rentian; Zhang Lihua; Gong Yi

2010-01-01T23:59:59.000Z

53

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid  

E-Print Network (OSTI)

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid Fault Wind Turbines with Induction Generator during Grid Fault by Sigrid M. Bolik Institute of Energy turbine technology has undergone rapid developments. Growth in size and the optimization of wind turbines

Hansen, René Rydhof

54

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines  

E-Print Network (OSTI)

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines, China mcheng@seu.edu.cn Abstract-- Grid connected wind turbines are the sources of power fluctuations presents an individual pitch control (IPC) strategy to mitigate the wind turbine power fluctuation at both

Hu, Weihao

55

Air-Source Heat Pump Basics | Department of Energy  

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

Source Heat Pump Basics Source Heat Pump Basics Air-Source Heat Pump Basics August 19, 2013 - 11:03am Addthis Air-source heat pumps transfer heat between the inside of a building and the outside air. How Air-Source Heat Pumps Work This diagram of a split-system heat pump heating cycle shows refrigerant circulating through a closed loop that passes through the wall of a house. Inside the house the refrigerant winds through indoor coils, with a fan blowing across them, and outside the house is another fan and another set of coils, the outdoor coils. A compressor is between the coils on one half of the loop, and an expansion valve is between the coils on the other half. The diagram is explained in the caption. In heating mode, an air-source heat pump evaporates a refrigerant in the outdoor coil; as the liquid evaporates it pulls

56

A large volume 2000 MPA air source for the radiatively driven hypersonic wind tunnel  

SciTech Connect

An ultra-high pressure air source for a hypersonic wind tunnel for fluid dynamics and combustion physics and chemistry research and development must provide a 10 kg/s pure air flow for more than 1 s at a specific enthalpy of more than 3000 kJ/kg. The nominal operating pressure and temperature condition for the air source is 2000 MPa and 900 K. A radial array of variable radial support intensifiers connected to an axial manifold provides an arbitrarily large total high pressure volume. This configuration also provides solutions to cross bore stress concentrations and the decrease in material strength with temperature. [hypersonic, high pressure, air, wind tunnel, ground testing

Constantino, M

1999-07-14T23:59:59.000Z

57

Commercial Air-Source Heat Pumps, Purchasing Specifications for Energy-Efficient Products (Fact Sheet)  

SciTech Connect

Energy efficiency purchasing specifications for federal procurements of commercial air-source heat pumps.

Not Available

2011-02-11T23:59:59.000Z

58

Optimal control for variable-speed wind generation systems using General Regression Neural Network  

Science Journals Connector (OSTI)

Abstract An induction generator (IG) speed drive with the application of an optimal controller and a proposed General Regression Neural Network (GRNN) controller is introduced in this paper. Grid connected wind energy conversion system (WECS) present interesting control demands, due to the intrinsic nonlinear characteristic of wind mills and electric generators. The GRNN with adaptive ant colony optimization (AACO) torque compensation is feed-forward to increase the robustness of the wind driven induction generator system. An optimal control loop for the wind power system is designed. The optimality of the whole system is defined in relation with the trade-off between the wind energy conversion maximization and the minimization of the induction generator torque variation that is responsible for the frequency fluctuations. This is achieved by using a combined optimization criterion, resulting in a LQ tracking problem with an infinite horizon and a measurable exogenous variable (wind speed). The proposed controller is designed to drive the turbine speed to extract maximum power from the wind and adjust to the power regulation.

Chih-Ming Hong; Fu-Sheng Cheng; Chiung-Hsing Chen

2014-01-01T23:59:59.000Z

59

Airflow regulation in variable-speed systems for residential HVAC applications  

SciTech Connect

In the majority of heating, ventilating, and air-conditioning (HVAC) systems, air is the final medium for adding or extracting heat from or to the space to be air conditioned. Air is heated by passing it over a heat transfer device called a coil, which is a heat exchanger with air on the outside and the primary heating/cooling medium (water, steam, electricity, refrigerant, etc.) on the inside. One of the major factors determining heat transfer is the airflow rate, which can be controlled by mechanical means or by controlling the speed of the fan. Centrifugal fans driven by single-speed induction motors traditionally have been used in the JVAC industry but have an airflow characteristic that depends on the static pressure seen by the system. Variable-speed systems are starting to emerge as a strong alternative to traditional systems because of their ability to match the demand of the air-conditioned space, resulting in higher efficiencies and higher comfort. System efficiency can be improved by constraining the range of airflows provided by the fan or blower system in response to system pressure, that is, by controlling the airflow over the heat exchanger. This paper presents a method to regulate airflow independent of the static pressure and without the need for airflow sensors.

Becerra, R.C.; Beifus, B.L. [General Electric Co., Fort Wayne, IN (United States)

1996-11-01T23:59:59.000Z

60

Fixed-Speed and Variable-Slip Wind Turbines Providing Spinning Reserves to the Grid: Preprint  

SciTech Connect

As the level of wind penetration increases, wind turbine technology must move from merely generating power from wind to taking a role in supporting the bulk power system. Wind turbines should have the capability to provide inertial response and primary frequency (governor) response so they can support the frequency stability of the grid. To provide governor response, wind turbines should be able to generate less power than the available wind power and hold the rest in reserve, ready to be accessed as needed. This paper explores several ways to control wind turbine output to enable reserve-holding capability. This paper focuses on fixed-speed (also known as Type 1) and variable-slip (also known as Type 2) turbines.

Muljadi, E.; Singh, M.; Gevorgian, V.

2012-11-01T23:59:59.000Z

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


61

E-Print Network 3.0 - air-source heat pumps Sample Search Results  

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

pumps Search Powered by Explorit Topic List Advanced Search Sample search results for: air-source heat pumps...

62

Novel sensorless generator control and grid fault ride-through strategies for variable-speed wind turbines and implementation on a new real-time simulation platform.  

E-Print Network (OSTI)

??The usage of MW-size variable-speed wind turbines as sources of energy has increased significantly during the last decade. Advantages over fixed-speed wind turbines include more… (more)

Yang, Sheng

2010-01-01T23:59:59.000Z

63

Field demonstration of optimized variable speed compressor and condenser fan control for commercial refrigeration systems. Final report  

SciTech Connect

The demonstration project discussed in this report consisted of two separate programs intended to examine methods of implementing variable-frequency drives (VFDs) to increase the efficiency of supermarket refrigeration racks. The first program examined the optimum control strategy for minimizing the power consumption of medium-temperature parallel compressor racks driven by VFDs. The second program, aimed at developing the optimum control strategy for variable-speed control of supermarket condenser fans.

NONE

1997-11-01T23:59:59.000Z

64

Variable-Speed Wind Generator System with Maximum Output Power Control  

Science Journals Connector (OSTI)

To achieve maximum output power from wind generator systems, the rotational speed of wind generators should be adjusted in real time according to natural wind speed. This chapter pays attention to an optimum rota...

Yoko Amano

2013-01-01T23:59:59.000Z

65

Comparing Two Types of Magnetically- Coupled Adjustable Speed Drives with Variable Frequency Drives in Pump and Fan Applications  

E-Print Network (OSTI)

This paper presents the results from laboratory tests on MagnaDrive Corporations fixed-magnet magnetically-coupled adjustable speed drive (MC-ASD) and Coyote Electronics electromagnetic MC-ASD as compared to a typical variable frequency drive (VFD...

Anderson, K. J.; Chvala, W. D.

66

Resonant Vibrations Resulting from the Re-Engineering of a Constant-Speed 2-Bladed Turbine to a Variable-Speed 3-Bladed Turbine  

SciTech Connect

The CART3 (Controls Advanced Research Turbine, 3-bladed) at the National Wind Technology Center has recently been converted from a 2-bladed constant speed machine to a 3-bladed variable speed machine designed specically for controls research. The purpose of this conversion was to develop an advanced controls field-testing platform which has the more typical 3-bladed configuration. A result of this conversion was the emergence of several resonant vibrations, some of which initially prevented operation of the turbine until they could be explained and resolved. In this paper, the investigations into these vibrations are presented as 'lessons-learned'. Additionally, a frequency-domain technique called waterfall plotting is discussed and its usefulness in this research is illustrated.

Fleming, P.; Wright, A. D.; Finersh, L. J.

2010-12-01T23:59:59.000Z

67

Variable speed drive as an alternative solution for a micro-hydro power plant.  

E-Print Network (OSTI)

?? This diploma work is mainly focused on developing the control strategy for avariable speed drive as an alternative solution to a micro-hydro power plant.… (more)

Akhtar, Malik Usman

2012-01-01T23:59:59.000Z

68

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 23, NO. 2, JUNE 2008 551 Sliding Mode Power Control of Variable-Speed Wind  

E-Print Network (OSTI)

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 23, NO. 2, JUNE 2008 551 Sliding Mode Power Control of Variable-Speed Wind Energy Conversion Systems Brice Beltran, Tarek Ahmed-Ali, and Mohamed El Hachemi in variable-speed wind energy conversion sys- tems (VS-WECS). These systems have two operation regions de

Paris-Sud XI, Université de

69

Measurable energy savings of installing variable frequency drives for cooling towers’ fans, compared to dual speed motors  

Science Journals Connector (OSTI)

Abstract In recent years the building management system (BMS) controllers have been used to control the operation of heating, ventilation, and air conditioning system in addition to lighting and some electrical equipment in order to save energy. In the water cooled system, the BMS controls the operation process of the cooling towers (CTs) fans of dual speed motors to maintain a constant leaving water temperature for different cooling loads and different ambient wet bulb temperature (WBT). This paper presents the effect of installing variable frequency drives (VFDs) for \\{CTs\\} fans in Kuwait during summer season on energy savings compared to dual speed control. The results have shown that with VFD mode, the reduction in water consumption was over 13% compared to the commonly used dual speed mode. More importantly, the combined power for the chillers and the \\{CTs\\} fans for the same amount of cooling produced were reduced by 5.8% in the VFD mode.

E. Al-Bassam; R. Alasseri

2013-01-01T23:59:59.000Z

70

The VSL Discussion: What Does Variable Speed of Light Mean and Should we be Allowed to Think About ?  

E-Print Network (OSTI)

In the past years, variable speed of light (VSL) theories have been of growing interest but also a subject of controversial discussion. They have been accused both for tautologies and for violating special relativity, and concerns have been expressed about the validity of such approaches in general (e.g. Ellis, astro-ph/0703751). Without trying completeness on the issue, the example of Einstein's VSL attempts (1911) and Dicke's `electromagnetic' theory (1957) are urges to give some comments on the above criticism.

Alexander Unzicker

2007-08-21T23:59:59.000Z

71

Kosciusko REMC - Residential Geothermal and Air-source Heat Pump Rebate  

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

Kosciusko REMC - Residential Geothermal and Air-source Heat Pump Kosciusko REMC - Residential Geothermal and Air-source Heat Pump Rebate Program Kosciusko REMC - Residential Geothermal and Air-source Heat Pump Rebate Program < Back Eligibility Residential Savings Category Heating & Cooling Commercial Heating & Cooling Heat Pumps Appliances & Electronics Water Heating Maximum Rebate Maximum of two rebates per household Program Info State Indiana Program Type Utility Rebate Program Rebate Amount Geothermal System: $250 Air-Source Heat Pump: $150 Electric Water Heater: $75 - $125 Provider Kosciusko REMC Kosciusko REMC offers rebates (as bill credits) to residential members for the purchase and installation of high efficiency air-source heat pumps, geothermal heat pumps, and electric water heaters. For each purchase of an

72

Wabash County REMC - Residential Geothermal and Air-source Heat Pump Rebate  

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

Wabash County REMC - Residential Geothermal and Air-source Heat Wabash County REMC - Residential Geothermal and Air-source Heat Pump Rebate Program Wabash County REMC - Residential Geothermal and Air-source Heat Pump Rebate Program < Back Eligibility Residential Savings Category Heating & Cooling Commercial Heating & Cooling Heat Pumps Appliances & Electronics Water Heating Maximum Rebate Geothermal: $750 Air Source Heat Pumps: $625 One rebate per house Program Info State Indiana Program Type Utility Rebate Program Rebate Amount Air Source Heat Pumps: $125 - $625/ton Geothermal Heat Pumps: $150 - $750/ton Water Heater: $100 Provider Wabash County REMC Wabash Rural Electric Membership Cooperative (REMC) is a member-owned electric distribution organization that provides service to customers in north-central Indiana. To encourage energy efficiency, Wabash County REMC

73

Variable-speed-of-light cosmology and second law of thermodynamics  

Science Journals Connector (OSTI)

We examine whether cosmologies with a varying speed of light (VSL) are compatible with the second law of thermodynamics. We find that the VSL cosmology with a varying fundamental constant is severely constrained by the second law of thermodynamics, whereas the bimetric cosmological models are less constrained.

Donam Youm

2002-08-12T23:59:59.000Z

74

Covered Product Category: Residential Air-Source Heat Pumps | Department of  

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

Residential Air-Source Heat Pumps Residential Air-Source Heat Pumps Covered Product Category: Residential Air-Source Heat Pumps October 7, 2013 - 10:35am Addthis ENERGY STAR logo FEMP provides acquisition guidance across a variety of product categories, including residential air-source heat pumps (ASHPs), which are an ENERGY STAR®-qualified product category. Federal laws and executive orders mandate that agencies meet these efficiency requirements in all procurement and acquisition actions that are not specifically exempted by law. Most manufacturers display the ENERGY STAR label on complying models. For a model not displaying this label, check the manufacturer's literature to determine if it meets the efficiency requirements outlined by ENERGY STAR. Performance Requirements for Federal Purchases

75

Covered Product Category: Residential Air-Source Heat Pumps | Department of  

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

Air-Source Heat Pumps Air-Source Heat Pumps Covered Product Category: Residential Air-Source Heat Pumps October 7, 2013 - 10:35am Addthis ENERGY STAR logo FEMP provides acquisition guidance across a variety of product categories, including residential air-source heat pumps (ASHPs), which are an ENERGY STAR®-qualified product category. Federal laws and executive orders mandate that agencies meet these efficiency requirements in all procurement and acquisition actions that are not specifically exempted by law. Most manufacturers display the ENERGY STAR label on complying models. For a model not displaying this label, check the manufacturer's literature to determine if it meets the efficiency requirements outlined by ENERGY STAR. Performance Requirements for Federal Purchases For the most up-to-date efficiency levels required by ENERGY STAR, look for

76

High-Speed Optical Spectroscopy of a Cataclysmic Variable Wind: BZ Camelopardalis  

E-Print Network (OSTI)

BZ Cam is the first cataclysmic variable star with an accretion disk wind evident in its optical spectrum. The wind was found by Thorstensen, who discovered intermittent P Cygni profiles occurring simultaneously in He I 5876 Angstroms and H alpha. We have since obtained spectra with 0.4-Angstroms/pixel dispersion and 60-s time resolution. We find a wind much faster and more rapidly variable than the radiatively accelerated winds of OB stars, Wolf-Rayet stars, or luminous blue variables. Instead of showing blob ejection, the whole wind of BZ Cam appears to turn on and off. We use this to measure the acceleration law of a CV wind for the first time. The velocity increases linearly with time, attaining blue edge velocities near -3000 km/s, and absorption velocities near -1700 km/s, in 6 to 8 min after starting near rest. We also find a subsequent linear deceleration to nearly rest in 30 to 40 min, perhaps an effect of dilution as the wind expands. No periodicity from rotational outflow is obvious. This wind is erratic and incessantly variable, and perhaps bipolar and face-on, but not highly collimated. The P Cygni absorption events trace out sawtooth waves, occurring within 30 to 40 white dwarf radii from the disk. This is the approximate size of the disk, as well as the disk/wind transition region recently postulated by Knigge and Drew. We estimate a distance of 830 +/- 160 pc, and an orbital inclination i such that 12 < i(degrees) < 40.

F. A. Ringwald; T. Naylor

1997-10-02T23:59:59.000Z

77

Auto-Calibration and Control Strategy Determination for a Variable-Speed Heat Pump Water Heater Using Optimization  

SciTech Connect

This paper introduces applications of the GenOpt optimizer coupled with a vapor compression system model for auto-calibration and control strategy determination towards the development of a variable-speed ground-source heat pump water heating unit. The GenOpt optimizer can be linked with any simulation program using input and output text files. It effectively facilitates optimization runs. Using our GenOpt wrapper program, we can flexibly define objectives for optimizations, targets, and constraints. Those functionalities enable running extensive optimization cases for model calibration, configuration design and control strategy determination. In addition, we describe a methodology to improve prediction accuracy using functional calibration curves. Using the calibrated model, we investigated control strategies of the ground-source heat pump water heater, considering multiple control objectives, covering the entire operation range.

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

2012-01-01T23:59:59.000Z

78

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 40, NO. 2, MARCH/APRIL 2004 565 Modeling and Control of a Variable-Speed  

E-Print Network (OSTI)

. The advantages of the proposed system are reduced harmonic injection to power grid, wide speed operation range. It can be directly applied to wind power generators, small-scale hydroelectric generators, stand Identifier 10.1109/TIA.2004.824504 Fig. 1. Traditional wind power generation systems. (a) Variable

Mi, Chunting "Chris"

79

The effects of outdoor heat exchanger hydrophobic treatment on the performance of an air source heat pump.  

E-Print Network (OSTI)

??The effects of outdoor heat exchanger hydrophobic treatment on the performance of an air source heat pump were investigated. The base case tests used a… (more)

Parker, Brandon DeWayne

2012-01-01T23:59:59.000Z

80

Short communication Optimization of hybrid ground coupled and air source heat pump systems  

E-Print Network (OSTI)

Short communication Optimization of hybrid ­ ground coupled and air source ­ heat pump systems 2008 Accepted 14 January 2010 Available online 28 January 2010 Keywords: Ground coupled heat pump Air to water heat pump Thermal storage device Hybrid HVAC system Energy efficiency Numerical simulation a b

Fernández de Córdoba, Pedro

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


81

Experimental Research of Air Source Heat Pump Frosting and Defrosting in a Double Stage-Coupling Heat Pump  

E-Print Network (OSTI)

, the effect of the heat storage tank to the air source heat pump defrosting is test. Owing to the existence of the heat storage tank, thermal inertia of the loop is relatively high. The frosting and defrosting course of the air source heat pump have little...

Wang, Z.; Gu, J.; Lu, Z.

2006-01-01T23:59:59.000Z

82

PERFORMANCE EVALUATION OF AN AIR-TO-AIR HEAT PUMP COUPLED WITH TEMPERATE AIR-SOURCES INTEGRATED INTO A DWELLING  

E-Print Network (OSTI)

PERFORMANCE EVALUATION OF AN AIR-TO-AIR HEAT PUMP COUPLED WITH TEMPERATE AIR-SOURCES INTEGRATED.peuportier@mines-paristech.fr, Tel.: +33 1 40 51 91 51 ABSTRACT An inverter-driven air-to-air heat pump model has been developped capacity air-to-air heat pump coupled with temperate air sources (crawlspace, attic, sunspace, heat

Paris-Sud XI, Université de

83

STUDY OF FROST GROWTH ON HEAT EXCHANGERS USED AS OUTDOOR COILS IN AIR SOURCE HEAT PUMP SYSTEMS  

E-Print Network (OSTI)

STUDY OF FROST GROWTH ON HEAT EXCHANGERS USED AS OUTDOOR COILS IN AIR SOURCE HEAT PUMP SYSTEMS OF FROST GROWTH ON HEAT EXCHANGERS USED AS OUTDOOR COILS IN AIR SOURCE HEAT PUMP SYSTEMS Dissertation . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 3.5.3 Air Side Heat Transfer Rates . . . . . . . . . . . . . . . . . . 43 3.5.4 Fluid Side Heat

84

Optimal Operation of Variable Speed Pumping System in China’s Eastern Route Project of S?to?N Water Diversion Project  

Science Journals Connector (OSTI)

A dynamic planning model for optimizing operation of variable speed pumping system aiming at minimum power consumption was proposed to achieve economic operation. The No. 4 Jiangdu Pumping Station a source pumping station in China’s Eastern Route of South?to?North Water Diversion Project is taken as a study case. Since the sump water level of Jiangdu Pumping Station is affected by the tide of Yangtze River the daily?average heads of the pumping system varies yearly from 3.8m to 7.8m and the tide level difference in one day up to 1.2m. Comparisons of operation electricity cost between optimized variable speed and fixed speed operations of pumping system were made. When the full load operation mode is adopted whether or not electricity prices in peak?valley periods are considered the benefits of variable speed operation cannot compensate the energy consumption of the VFD. And when the pumping system operates in part load and the peak?valley electricity prices are considered the pumping system should cease operation or lower its rotational speed in peak load hours since the electricity price are much higher and to the contrary the pumping system should raise its rotational speed in valley load hours to pump more water. The computed results show that if the pumping system operates in 80% or 60% loads the energy consumption cost of specified volume of water will save 14.01% and 26.69% averagely by means of optimal variable speed operation and the investment on VFD will be paid back in 2 or 3 years. However if the pumping system operates in 80% or 60% loads and the energy cost is calculated in non peak?valley electricity price the repayment will be lengthened up to 18 years. In China’s S?to?N Water Diversion Project when the market operation and peak?valley electricity prices are taken into effect to supply water and regulate water levels in regulation reservoirs as Hongzehu Lake Luomahu Lake etc. the economic operation of water?diversion pumping stations will be vital and the adoption of VFDs to achieve optimal operation may be a good choice.

Jilin Cheng; Lihua Zhang; Rentian Zhang; Yi Gong; Honggeng Zhu; Dongsheng Deng; Xuesong Feng; Jinxian Qiu

2010-01-01T23:59:59.000Z

85

Hot gas defrosting method for air-source transcritical CO2 heat pump systems  

Science Journals Connector (OSTI)

Abstract When the air-source heat pump systems operate at low ambient temperatures in winter, frost forms on the coil surface of the outdoor evaporators. The frost substantially affects the operating performance and energy efficiency of heat pump systems, and hence periodic defrosting is essential. In this study, several defrost methods are presented to look for a candidate for air-source transcritical CO2 heat pump systems. The hot gas method proves to be more suitable among other defrosting methods for transcritical CO2 heat pump systems. To validate its reliability and rationality, an air-source transcritical CO2 heat pump water heater was built in a climatic laboratory. Through the experiments, the dynamic process of temperature and pressure were obtained to demonstrate the hot gas defrosting characteristics and system cycle. The hot gas defrosting cycle in the p–h diagram was also validated by experiment results. Meanwhile, instant defrosting images were captured to record the dynamic defrosting process. The defrosting process lasted 10 min and defrosting efficiency was 34.8% for hot gas defrosting method. The effectiveness and applicability of hot gas defrosting method for CO2 heat pump water heater is validated by experiments.

Bin Hu; Dongfang Yang; Feng Cao; Ziwen Xing; Jiyou Fei

2015-01-01T23:59:59.000Z

86

General study of the control principles and dynamic fault behaviour of variable-speed wind turbine and wind farm generic models  

Science Journals Connector (OSTI)

Abstract The interest towards generic models or sometimes also called standard models of wind turbine generators (WTGs) is significantly increasing. Mainly due to their improved power quality, better controllability and higher power extraction capability, variable-speed wind turbines driving a synchronous or an induction machine are capturing the global market. Throughout this paper, dynamic modelling and performance analysis of the generic models of the variable-speed WTGs, namely the doubly-fed induction generator and the fully-rated converter based WTGs, are achieved using integration between Matlab/Simulink and PSCAD/EMTDC simulation platforms. Later on, the performance of type-4 wind turbine driving a permanent magnet synchronous machine is analysed during fault and then compared with the case when driving a wound rotor induction machine. The differences in control principles and dynamic fault behaviour are highlighted. Afterwards, investigations on wind farm level are accomplished. A case study during which the developed generic models and the generic model of the variable-speed machine are compared is conducted. Different arrangements for the construction of the generic wind farm are considered.

Tareq Saber Abuaisha

2014-01-01T23:59:59.000Z

87

Experimental study of an air-source heat pump for simultaneous heating and cooling Part 2: Dynamic behaviour and two-phase thermosiphon  

E-Print Network (OSTI)

1 Experimental study of an air-source heat pump for simultaneous heating and cooling ­ Part 2 the concepts of an air-source Heat Pump for Simultaneous heating and cooling (HPS) designed for hotels. Unlike conventional air-source heat pumps, defrosting is carried out without stopping the heat production

Boyer, Edmond

88

A fuzzy logic supervisor for active and reactive power control of a variable speed wind energy conversion system associated to a flywheel storage system  

Science Journals Connector (OSTI)

In this paper, we propose a Wind Energy Conversion System (WECS) at variable speed using a Doubly Fed Induction Generator (DFIG) controlled on the rotor side through converters. A Flywheel Energy Storage System (FESS) is connected to the studied wind generator at the DC bus in order to evaluate its capacity to participate to the ancillary services. We study the improvement of the active and reactive power quality produced by the wind generator and its effect on the load voltage regulation connected to the wind generator. For that, a fuzzy logic supervisor is established to control the FESS operation and the DC bus voltage in order to smooth the active power fluctuations due to the random wind speed variations. A control law is also described to smooth the reactive power at the connection node to the grid.

Lilia Jerbi; Lotfi Krichen; Abderrazak Ouali

2009-01-01T23:59:59.000Z

89

The effects of outdoor heat exchanger hydrophobic treatment on the performance of an air source heat pump  

E-Print Network (OSTI)

THE EFFECTS OF OUTDOOR HEAT EXCHANGER HYDROPHOBIC TREATMENT ON THE PERFORMANCE OF AN AIR SOURCE HEAT PUMP A Thesis by BRANDON DEWAYNE PARKER 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 May 1995 Major Subject: Mechanical Engineering THE EFFECTS OF OUTDOOR HEAT EXCHANGER HYDROPHOBIC TREATMENT ON THE PERFORMANCE OF AN AIR SOURCE HEAT PUMP A Thesis by BRANDON DEWAYNE PARKER Submitted...

Parker, Brandon DeWayne

2012-06-07T23:59:59.000Z

90

Assessment of a Solar Assisted Air Source and a Solar Assisted Water Source Heat Pump System in a Canadian Household  

Science Journals Connector (OSTI)

This paper presents an assessment of two solar assisted heat pump systems integrated into an air distribution system in three different 210 m2 single detached residential houses in Montreal, Canada. The housing types considered are a 1980's house, an energy efficient house and a “net zero ready” house. The advanced heat pump systems considered in the analysis focused on coupling solar energy on the evaporator side of an air source and water source heat pumps to improve performance compared to a standard air source heat pump and provide an alternative to a costly ground source heat pump system. The annual energy consumption and utility cost of the solar assisted heat pump systems were compared to a market available air source heat pump, a ground source heat pump system as well as the typical reference housing heating and cooling system. The results predicted that a solar assisted air source heat pump has a comparable capital cost to a ground source heat pump system in all housing types and the highest energy savings for a “net zero ready” house of 34% compared to the base case. The solar assisted water source heat pump did not yield interesting results, as the solar assisted air source heat pump demonstrated improved energy savings and lower capital costs in all housing types considered. Comparing the 20 year life cycle costs of the solar assisted heat pump systems to the base case, only in the 1980's housing archetype did the solar assisted air source heat pump system demonstrate a lower life cycle cost than the base case. A standard air source heat pump yielded the lowest life cycle cost in the 1980's and energy efficient house considered and the reference base case system had the lowest life cycle cost in the net zero ready house considered.

Martin Kegel; Justin Tamasauskas; Roberto Sunye; Antoine Langlois

2012-01-01T23:59:59.000Z

91

Field Study of Performance, Comfort, and Sizing of Two Variable-Speed Heat Pumps Installed in a Single 2-Story Residence  

SciTech Connect

With the recent advancements in the application of variable-speed (VS) compressors to residential HVAC systems, opportunities are now available to size heat pumps (HPs) to more effectively meet heating and cooling loads in many of the climate zones in the US with limited use of inefficient resistance heat. This is in contrast to sizing guidance for traditional single-speed HPs that limits the ability to oversize with regard to cooling loads, because of risks of poor dehumidification during the cooling season and increased cycling losses. VS-drive HPs can often run at 30-40% of their rated cooling capacity to reduce cycling losses, and can adjust fan speed to provide better indoor humidity control. Detailed air-side performance data was collected on two VS-drive heat pumps installed in a single unoccupied research house in Knoxville, TN, a mixed-humid climate. One system provided space conditioning for the upstairs, while the other unit provided space conditioning for the downstairs. Occupancy was simulated by operating the lights, shower, appliances, other plug loads, etc. to simulate the sensible and latent loads imposed on the building space by internal electric loads and human occupants according to the Building America Research Benchmark (2008). The seasonal efficiency and energy use of the units are calculated. Annual energy use is compared to that of the single speed minimum efficiency HPs tested in the same house previously. Sizing of the units relative to the measured building load and manual J design load calculations is examined. The impact of the unit sizing with regards to indoor comfort is also evaluated.

Munk, Jeffrey D [ORNL; Odukomaiya, Adewale O [ORNL; Gehl, Anthony C [ORNL; Jackson, Roderick K [ORNL

2014-01-01T23:59:59.000Z

92

Very High Fuel Economy, Heavy Duty, Constant Speed, Truck Engine Optimized Via Unique Energy Recovery Turbines and Facilitated High Efficiency Continuously Variable Drivetrain  

SciTech Connect

The project began under a corporative agreement between Mack Trucks, Inc and the Department of Energy starting from September 1, 2005. The major objective of the four year project is to demonstrate a 10% efficiency gain by operating a Volvo 13 Litre heavy-duty diesel engine at a constant or narrow speed and coupled to a continuously variable transmission. The simulation work on the Constant Speed Engine started on October 1st. The initial simulations are aimed to give a basic engine model for the VTEC vehicle simulations. Compressor and turbine maps are based upon existing maps and/or qualified, realistic estimations. The reference engine is a MD 13 US07 475 Hp. Phase I was completed in May 2006 which determined that an increase in fuel efficiency for the engine of 10.5% over the OICA cycle, and 8.2% over a road cycle was possible. The net increase in fuel efficiency would be 5% when coupled to a CVT and operated over simulated highway conditions. In Phase II an economic analysis was performed on the engine with turbocompound (TC) and a Continuously Variable Transmission (CVT). The system was analyzed to determine the payback time needed for the added cost of the TC and CVT system. The analysis was performed by considering two different production scenarios of 10,000 and 60,000 units annually. The cost estimate includes the turbocharger, the turbocompound unit, the interstage duct diffuser and installation details, the modifications necessary on the engine and the CVT. Even with the cheapest fuel and the lowest improvement, the pay back time is only slightly more than 12 months. A gear train is necessary between the engine crankshaft and turbocompound unit. This is considered to be relatively straight forward with no design problems.

Bahman Habibzadeh

2010-01-31T23:59:59.000Z

93

The InterHourly-Variability (IHV) Index of Geomagnetic Activity and its Use in Deriving the Long-term Variation of Solar Wind Speed  

E-Print Network (OSTI)

We describe the derivation of the InterHourly Variability (IHV) index of geomagnetic activity. The IHV-index for a geomagnetic element is mechanically derived from hourly values as the sum of the unsigned differences between adjacent hours over a seven-hour interval centered on local midnight. The index is derived separately for stations in both hemispheres within six longitude sectors using only local night hours. It is intended as a long-term index. Available data allows derivation of the index back well into the 19th century. On a time scale of a 27-day Bartels rotation, IHV averages for stations with corrected geomagnetic latitude less than 55 degrees are strongly correlated with midlatitude range indices. Assuming a constant calibration of the aa-index we find that observed yearly values of aa before the year 1957 are 2.9 nT too small compared to values calculated from IHV using the regression constants based on 1980-2004. We interpret this discrepancy as an indication that the calibration of the aa index is in error before 1957. There is no such problem with the ap index. Rotation averages of IHV are also strongly correlated with solar wind parameters (BV^2). On a time scale of a year combining the IHV-index and the recently-developed Inter-Diurnal Variability (IDV) index (giving B) allows determination of solar wind speed, V, from 1890-present. Over the ~120-year series, the yearly mean solar wind speed varied from a low of 303 km/s in 1902 to a high value of 545 km/s in 2003. The calculated yearly values of the product BV using B and V separately derived from IDV and IHV agree quantitatively with (completely independent) BV derived from the amplitude of the diurnal variation of the H component in the polar caps since 1926 and sporadically beyond.

Leif Svalgaard; Edward W. Cliver

2007-06-07T23:59:59.000Z

94

Air Source Heat Pumps for Cold Climate Applications: Recent U. S. R&D Results from IEA HPP Annex 41  

SciTech Connect

Air source heat pumps are easily applied to buildings almost anywhere. They are widespread in milder climate regions but their use in cold regions is hampered due to low efficiency and heating capacity at cold outdoor temperatures. This article describes selected R&D activities aimed at improving their cold weather performance.

Baxter, Van D [ORNL; Groll, Dr. Eckhard A. [Purdue University, Ray W. Herrick Laboratories; Shen, Bo [ORNL

2014-01-01T23:59:59.000Z

95

A Tool for Life Cycle Climate Performance (LCCP) Based Design of Residential Air Source Heat Pumps  

SciTech Connect

A tool for the design of air source heat pumps (ASHP) based on their life cycle climate performance (LCCP) analysis is presented. The LCCP model includes direct and indirect emissions of the ASHP. The annual energy consumption of the ASHP is determined based on AHRI Standard 210/240. The tool can be used as an evaluation tool when the user inputs the required performance data based on the ASHP type selected. In addition, this tool has system design capability where the user inputs the design parameters of the different components of the heat pump and the tool runs the system simulation software to calculate the performance data. Additional features available in the tool include the capability to perform parametric analysis and sensitivity study on the system. The tool has 14 refrigerants, and 47 cities built-in with the option for the user to add more refrigerants, based on NIST REFPROP, and cities, using TMY-3 database. The underlying LCCP calculation framework is open source and can be easily customized for various applications. The tool can be used with any system simulation software, load calculation tool, and weather and emissions data type.

Beshr, Mohamed [University of Maryland, College Park; Aute, Vikrant [University of Maryland, College Park; Abdelaziz, Omar [ORNL; Fricke, Brian A [ORNL; Radermacher, Reinhard [University of Maryland, College Park

2014-01-01T23:59:59.000Z

96

Development of a High Performance Air Source Heat Pump for the US Market  

SciTech Connect

Heat pumps present a significant advantage over conventional residential heating technologies due to higher energy efficiencies and less dependence on imported oil. The US development of heat pumps dates back to the 1930 s with pilot units being commercially available in the 1950 s. Reliable and cost competitive units were available in the US market by the 1960 s. The 1973 oil embargo led to increased interest in heat pumps prompting significant research to improve performance, particularly for cold climate locations. Recent increasing concerns on building energy efficiency and environmental emissions have prompted a new wave of research in heat pump technology with special emphasis on reducing performance degradation at colder outdoor air temperatures. A summary of the advantages and limitations of several performance improvement options sought for the development of high performance air source heat pump systems for cold climate applications is the primary focus of this paper. Some recommendations for a high performance cold climate heat pump system design most suitable for the US market are presented.

Abdelaziz, Omar [ORNL] [ORNL; Shen, Bo [ORNL] [ORNL; Gao, Zhiming [ORNL] [ORNL; Baxter, Van D [ORNL] [ORNL; Iu, Ipseng [ORNL] [ORNL

2011-01-01T23:59:59.000Z

97

Comparative performance evaluation of cascaded air-source hydronic heat pumps  

Science Journals Connector (OSTI)

Abstract The results are reported of an investigation of the effects of cascading air-source heat pumps on performance for hydronic residential systems. Three heat pump systems are modeled as single-stage, single-refrigerant cascaded, and two-refrigerant cascaded. Energy and exergy analyses are performed, and a comparative performance analysis is carried out, considering energy efficiency, refrigerant mass flow rates, evaporator pressure, exergy efficiency, and several other criteria. Three sets of source and supply temperatures, representing different climates and different water sink systems (low, medium and high temperature), are used to provide more comprehensive behavior assessments of the systems. Additionally, the optimum intermediate pressure of the cascaded systems for all working temperature pairs is found for the highest energetic COP and exergetic COP. Compared to a single stage heat pump, cascading improves the overall energy efficiency of the system for low-ambient temperatures, but not for high-ambient temperatures. Although this improvement is minor, the exergetic COP is increased by 67% for the single refrigerant cascaded system and 70% for a two-refrigerant cascaded system, at low ambient temperatures. Using refrigerant R404A in the low-pressure cycle marginally improves the energetic COP of the cascaded heat pump, but increases the evaporator working pressure, making it possible to use smaller compressors. However, the overall refrigerant mass flow rates increase with cascading. The two cascaded systems have higher exergy destructions (by almost four times) compared to the single stage system, mainly due to having more components, including an intermediate heat exchanger. Also, cascading shifts the major exergy destruction centers from the compressors and expansion valves to the evaporators. A comparison of cascaded and single-stage heat pumps shows that the exergy analysis results exhibit a different trend than energy analysis results with source and supply temperatures, highlighting the advantages of exergy methods in determining if cascading is appropriate for a given application.

R. Soltani; I. Dincer; M.A. Rosen

2015-01-01T23:59:59.000Z

98

The impact of TXV heating on the performance of air-source heat pump in heating mode  

SciTech Connect

The paper discusses the strategy of TXV heating, which adds a limited amount of heat on the surface of TXV sensor, to achieve energy saving and low cost in air-source heat pumps. The TXV heating is able to retard the valve closing so as to boost energy saving in heating mode. The testing results demonstrate the appropriate TXV heating achieves a remarkable improvement in COP and thermal comfort. The required heating power is not more than 40w. The additional equipment cost of TXV heating is less than $20. Thus, the strategy of TXV heating is practical from the view of technology and economy.

Gao, Zhiming [ORNL

2010-01-01T23:59:59.000Z

99

Field Test of High Efficiency Residential Buildings with Ground-source and Air-source Heat Pump Systems  

SciTech Connect

This paper describes the field performance of space conditioning and water heating equipment in four single-family residential structures with advanced thermal envelopes. Each structure features a different, advanced thermal envelope design: structural insulated panel (SIP); optimum value framing (OVF); insulation with embedded phase change materials (PCM) for thermal storage; and exterior insulation finish system (EIFS). Three of the homes feature ground-source heat pumps (GSHPs) for space conditioning and water heating while the fourth has a two-capacity air-source heat pump (ASHP) and a heat pump water heater (HPWH). Two of the GCHP-equipped homes feature horizontal ground heat exchange (GHX) loops that utillize the existing foundation and utility service trenches while the third features a vertical borehole with vertical u-tube GHX. All of the houses were operated under the same simulated occupancy conditions. Operational data on the house HVAC/Water heating (WH) systems are presented and factors influencing overall performance are summarized.

Ally, Moonis Raza [ORNL] [ORNL; Munk, Jeffrey D [ORNL] [ORNL; Baxter, Van D [ORNL] [ORNL

2011-01-01T23:59:59.000Z

100

Measured speed versus true speed  

E-Print Network (OSTI)

The theoretical predictions, derived from the Lorentz and the Tangherlini transformations, for the one-way speed of any physical entity are confronted with the corresponding expressions for the one-way measured speed obtained from a gedanken experiment. The experiment demonstrates that, for an inertial frame $K'$ in motion relative to an inertial frame $K$ where the one-way speed of light is isotropic, even the special theory of relativity renders the one-way speed of light as function of the velocity of $K'$ in agreement with the Tangherlini transformations. However, the two-way speed of light remains constant for all inertial frames, in agreement with the two-way experimental techniques. This implies that there must exist \\emph{one and only one} inertial frame where the one-way speed of light is isotropic. These investigations also show how we can determine, with certain restrictions, the true speed of a physical entity and of the true speed of $K'$ relative to $K$.

Israel Perez

2010-05-10T23:59:59.000Z

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


101

Economical Aspects of Adjustable Speed Drives in Pumping Systems  

E-Print Network (OSTI)

Speed variations of pumps have become increasingly popular as the technology to produce variable frequency drives has progressed. Variable speed drives have many advantages compared to throttle valves when it comes to regulation of flow. They offer...

Hovstadius, G.

102

Experimental study of an air-source heat pump for simultaneous heating and cooling Part 1: Basic concepts and performance verification  

E-Print Network (OSTI)

manufacturer. The operation of the high pressure control system, the transitions between heating, cooling, heating and cooling energies using the same electric energy input at the compressor. Chua et al. [31 Experimental study of an air-source heat pump for simultaneous heating and cooling ­ Part 1

Boyer, Edmond

103

Magnetically Coupled Adjustable Speed Motor Drives  

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

Alternating current electric motors rotate at a nearly constant speed that is determined by motor design and line frequency. Energy savings of 50% or more may be available when fixed speed systems are modified to allow the motor speed to match variable load requirements of a centrifugal fan or pump. This tip sheet describes the advantages of magnetically coupled ASDs and provides suggested actions.

104

Adjustable Speed Drive Part-Load Efficiency  

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

An adjustable speed drive (ASD) is a device that controls the rotational speed of motor-driven equipment. Variable frequency drives (VFDs), the most common type of ASDs, efficiently meet varying process requirements by adjusting the frequency and voltage of the power supplied to an AC motor to enable it to operate over a wide speed range. External sensors monitor flow, liquid levels, or pressure and then transmit a signal to a controller that adjusts the frequency and speed to match process requirements.

105

Reading with fixed and variable character pitch  

Science Journals Connector (OSTI)

We compared the effects of fixed and variable (proportional) spacing on reading speeds and found variable pitch to yield better performance at medium and large character sizes and...

Arditi, Aries; Knoblauch, Kenneth; Grunwald, Ilana

1990-01-01T23:59:59.000Z

106

VARIABLE SPEED INTEGRATED INTELLIGENT HVAC BLOWER  

SciTech Connect

This comprehensive topical report discusses the key findings in the development of an advanced blower for HVAC applications. The benefits of rearward inclined blades over that of traditional forward inclined blades is well documented, and several prototype wheels are demonstrated in various housings. A comparison of retrofitted blowers to that of three typical units from the industry is presented. The design and modification of the blower housing is addressed and the impact of size limitations on static efficiency is discussed. The roadmap to rearward-inclined wheel technology insertion is presented and typical static efficiency gains are documented.

Herman Wiegman; Charlie Stephens; Xiaoyue Liu; Ralph Carl; Sunny Zhuang; Paul Szczesny; Kamron Wright

2003-09-23T23:59:59.000Z

107

Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems  

E-Print Network (OSTI)

as other types of air source heat pumps, VRF systems needconventional packaged air source heat pumps. Typical GSHPis basically an air source heat pump), especially when the

Hong, Tainzhen

2010-01-01T23:59:59.000Z

108

Demonstration and Performance Monitoring of Foundation Heat Exchangers...  

Energy Savers (EERE)

for New and Existing Homes: Foundation Heat Exchanger, Oak Ridge, Tennessee Performance Analysis of Air-Source Variable Speed Heat Pumps and Various Electric Water Heating Options...

109

Integrating Environmental, Safety, and Quality Management System...  

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

Utilizing Bacteria for Sustainable Manufacturing of Low-Cost Nanoparticles Performance Analysis of Air-Source Variable Speed Heat Pumps and Various Electric Water Heating Options...

110

Design Wind Speed  

Science Journals Connector (OSTI)

Wind is characterized by various different parameters. They include the following items: (1) wind speed, such as the mean wind speed and maximum instantaneous wind speed; (2) wind direction such as the azimuth di...

Yozo Fujino; Kichiro Kimura; Hiroshi Tanaka

2012-01-01T23:59:59.000Z

111

Performance Variability  

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

Variability Variability of Highly Parallel Architectures William T.C. Kramer 1 and Clint Ryan 2 1 Department of Computing Sciences, University of California at Berkeley and the National Energy Research Scientific Computing Center, Lawrence Berkeley National Laboratory 2 Department of Computing Sciences, University of California at Berkeley Abstract. The design and evaluation of high performance computers has concentrated on increasing computational speed for applications. This performance is often measured on a well configured dedicated sys- tem to show the best case. In the real environment, resources are not always dedicated to a single task, and systems run tasks that may influ- ence each other, so run times vary, sometimes to an unreasonably large extent. This paper explores the amount of variation seen across four large distributed memory systems in a systematic manner. It then

112

Calibration of the Merrill-G.A.L.C.I.T. wind-tunnel, and a suggestion for a variable cross-section on a small high-speed wind-tunnel.  

E-Print Network (OSTI)

??Speed, power and flow inclination calibration tests run in the Merrill-GALCIT wind-tunnel are described and results presented. A description of the new balance-system is included.… (more)

Schwarzenbach, Jean Christophe

1942-01-01T23:59:59.000Z

113

Constant Speed for Processing  

Science Journals Connector (OSTI)

Synduction motor combines constant speed of synchronous motor with ruggedness of induction motor ... CONVENTIONAL SYNCHRONOUS ELECTRIC MOTORS operate at constant speed, regardless of load and voltage—frequency is the determining factor. ...

1956-04-23T23:59:59.000Z

114

Adjustable Speed Pumping Applications  

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

This tip sheet provides practical tips on the application of adjustable speed drives in industrial pumping systems.

115

Effectiveness of speed trailers on low-speed urban roadways  

E-Print Network (OSTI)

documents the effectiveness of speed trailers for reducing speeds on low-speed urban roadways. At each test site, vehicle speeds were collected at upstream, trailer, and downstream locations using piezoelectric sensors. Vehicles were "tracked" along...

Perrillo, Kerry Victoria

2012-06-07T23:59:59.000Z

116

Full Hybrid: Low Speed  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

highlighted Cruising button Passing button Braking button Stopped button highlighted Cruising button Passing button Braking button Stopped button LOW SPEED For initial acceleration and slow-speed driving, as well as reverse, the electric motor uses electricity from the battery to power the vehicle. If the battery needs to be recharged, the generator starts the engine and converts energy from the engine into electricity, which is stored in the battery. stage graphic: vertical blue rule Main stage: See through car with battery, engine, generator, power split device, and electric motor visible. The car is moving at a low speed. There are arrows flowing from the battery to the electric motor to the power split device to the front wheels. Main stage: See through car with battery, engine, generator, power split device, and electric motor visible. The car is moving at a low speed. There are arrows flowing from the battery to the electric motor to the power split device to the front wheels.

117

Effects on speed and safety of point-to-point speed enforcement systems: Evaluation on the urban motorway A56 Tangenziale di Napoli  

Science Journals Connector (OSTI)

Abstract In this paper, we evaluated the effects on speed and safety of the point-to-point (P2P) speed enforcement system activated on the urban motorway A56 in Italy. The P2P speed enforcement is a relatively new approach to traffic law enforcement that involves the calculation of the average speed over a section. To evaluate the speed effects, we performed a before–after analysis of speed data investigating also effects on non-compliance to speed limits. To evaluate the safety effects, we carried out an empirical Bayes observational before-and-after study. The P2P system led to very positive effects on both speed and safety. As far as the effects on the section average travel speeds, the system yielded to a reduction in the mean speed, the 85th percentile speed, the standard deviation of speed, and the proportion of drivers exceeding the speed limits, exceeding the speed limits more than 10 km/h, and exceeding the speed limits more than 20 km/h. The best results were the decrease of the speed variability and the reduction of the excessive speeding behaviour. The decrease in the standard deviation of speed was 26% while the proportion of light and heavy vehicles exceeding the speed limits more than 20 km/h was reduced respectively by 84 and 77%. As far as the safety effects, the P2P system yielded to a 32% reduction in the total crashes, with a lower 95% confidence limit of the estimate equal to 22%. The greatest crash reductions were in rainy weather (57%), on wet pavement (51%), on curves (49%), for single vehicle crashes (44%), and for injury crashes (37%). It is noteworthy that the system produced a statistically significant reduction of 21% in total crashes also in the part of the motorway where it was not activated, thus generating a significant spillover effect. The investigation of the effects of the P2P system on speed and safety over time allowed to develop crash modification functions where the relationship between crash modification factors and speed parameters (mean speed, 85th percentile speed, and standard deviation of speed) was expressed by a power function. Crash modification functions show that the effect of speed on safety is greater on curves and for injury crashes. Even though the study results show excellent outcomes, we must point out that the crash reduction effects decreased over time and speed, speed variability, and non-compliance to speed limits significantly increased over time. To maintain its effectiveness over time, P2P speed enforcement must be actively managed, i.e. constantly monitored and supported by appropriate sanctions.

Alfonso Montella; Lella Liana Imbriani; Vittorio Marzano; Filomena Mauriello

2015-01-01T23:59:59.000Z

118

High-Speed Optical Spectroscopy  

E-Print Network (OSTI)

The large surveys and sensitive instruments of modern astronomy are turning ever more examples of variable objects, many of which are extending the parameter space to testing theories of stellar evolution and accretion. Future projects such as the Laser Interferometer Space Antenna (LISA) and the Large Synoptic Survey Telescope (LSST) will only add more challenging candidates to this list. Understanding such objects often requires fast spectroscopy, but the trend for ever larger detectors makes this difficult. In this contribution I outline the science made possible by high-speed spectroscopy, and consider how a combination of the well-known progress in computer technology combined with recent advances in CCD detectors may finally enable it to become a standard tool of astrophysics.

T. R. Marsh

2007-06-28T23:59:59.000Z

119

Unsteady effects in dense, high speed, particle laden flows J.D. Regele a,  

E-Print Network (OSTI)

t Dense high speed non-compacted multiphase flows exist in variable phase turbines, explosions, and ejec multiphase flows can be found in a variety of practical applications such as variable phase turbines

Dabiri, John O.

120

Combination of Speed Stroke Grinding and High Speed Grinding with Regard to Sustainability  

E-Print Network (OSTI)

Combination of Speed Stroke Grinding and High Speed Grindinghow the combination of speed stroke grinding and high speed4] Inasaki, I. , 1988, Speed Stroke Grinding of Advanced

Linke, Barbara; M. Duscha; F. Klocke; Dornfeld, David

2011-01-01T23:59:59.000Z

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


121

Variable Frequency Pump Drives  

E-Print Network (OSTI)

-frequency electric motor drive. What is happenin9 with variable frequency driven pun,ps is a classical illustration that evolution in technical products takes place not only because of changes in the processes served by these products, or because of innovations...-pole 3550 rpm squirrel caqe induction motor became available in the early 1930s that high pressure pumps operating at that speed could be buil t. And now, in the 1980s, the development of the solid-state, variable frequency electric motor drive...

Karassik, I. J.; Petraccaro, L. L.; McGuire, J. T.

122

Chapter 18: Variable Frequency Drive Evaluation Protocol  

SciTech Connect

An adjustable-speed drive (ASD) includes all devices that vary the speed of a rotating load, including those that vary the motor speed and linkage devices that allow constant motor speed while varying the load speed. The Variable Frequency Drive Evaluation Protocol presented here addresses evaluation issues for variable-frequency drives (VFDs) installed on commercial and industrial motor-driven centrifugal fans and pumps for which torque varies with speed. Constant torque load applications, such as those for positive displacement pumps, are not covered by this protocol. Other ASD devices, such as magnetic drive, eddy current drives, variable belt sheave drives, or direct current motor variable voltage drives, are also not addressed. The VFD is by far the most common type of ASD hardware. With VFD speed control on a centrifugal fan or pump motor, energy use follows the affinity laws, which state that the motor electricity demand is a cubic relationship to speed under ideal conditions. Therefore, if the motor runs at 75% speed, the motor demand will ideally be reduced to 42% of full load power; however, with other losses it is about 49% of full load power.

Romberger, J.

2014-11-01T23:59:59.000Z

123

Wind speed estimation using multilayer perceptron  

Science Journals Connector (OSTI)

Abstract Wind speed knowledge is prerequisite in the siting of wind turbines. In consequence the wind energy use requires meticulous and specified knowledge of the wind characteristics at a location. This paper presents a method for determining the annual average wind speed at a complex terrain site by using neural networks, when only short term data are available for that site. This information is useful for preliminary calculations of the wind resource at a remote area having only a short time period of wind measurements measurement in a site. Artificial neural networks are useful for implementing non-linear process variables over time, and therefore are a useful tool for estimating the wind speed. The neural network used is multilayer perceptron with three layers and the supervised learning algorithm used is backpropagation. The inputs used in the neural network were wind speed and direction data from a single station, and the training patterns used correspond to sixty days data. The results obtained by simulating the annual average wind speed at the selected site based on data from nearby stations with correlation coefficients above 0.5 were satisfactory, compared with actual values. Reliable estimations were obtained, with errors below 6%.

Ramón Velo; Paz López; Francisco Maseda

2014-01-01T23:59:59.000Z

124

Forecasting Solar Wind Speeds  

E-Print Network (OSTI)

By explicitly taking into account effects of Alfven waves, I derive from a simple energetics argument a fundamental relation which predicts solar wind (SW) speeds in the vicinity of the earth from physical properties on the sun. Kojima et al. recently found from their observations that a ratio of surface magnetic field strength to an expansion factor of open magnetic flux tubes is a good indicator of the SW speed. I show by using the derived relation that this nice correlation is an evidence of the Alfven wave which accelerates SW in expanding flux tubes. The observations further require that fluctuation amplitudes of magnetic field lines at the surface should be almost universal in different coronal holes, which needs to be tested by future observations.

Takeru K. Suzuki

2006-02-03T23:59:59.000Z

125

High speed door assembly  

SciTech Connect

This invention is comprised of a high speed door assembly, comprising an actuator cylinder and piston rods, a pressure supply cylinder and fittings, an electrically detonated explosive bolt, a honeycomb structured door, a honeycomb structured decelerator, and a structural steel frame encasing the assembly to close over a 3 foot diameter opening within 50 milliseconds of actuation, to contain hazardous materials and vapors within a test fixture.

Shapiro, C.

1991-12-31T23:59:59.000Z

126

1International High Speed Rail Conference 19642064 High Speed Rail  

E-Print Network (OSTI)

1International High Speed Rail Conference 1964­2064 High Speed Rail: Celebrating Ambition 2014 by the Birmingham Centre for Railway Research and Education Conference programme 8 ­10 December 2014 Kindly supported by: #12;2 International High Speed Rail Conference Monday 8 December 12:00 ­ 12:50 Registration

Birmingham, University of

127

Control device for vehicle speed  

SciTech Connect

This patent describes a control device for vehicle speed comprising: a throttle driving means operatively coupled to a throttle valve of a vehicle; a set switch means for commanding memorization of the vehicle speed; a resume switch means for commanding read of the vehicle speed; a vehicle speed detecting means for generating a signal in accordance with the vehicle speed; a vehicle speed memory; an electronical control means for memorizing in the vehicle speed memory vehicle speed information corresponding to the signal obtained from the vehicle speed detecting means in response to actuation of the set switch means. The control means is also for reading out the content of the vehicle speed memory in response to actuation of the resume switch means to control the throttle driving means in accordance with the read-out content; a power supply means for supplying power to the electronical control means; and a power supply control switch means for controlling supply of power to the electronical control means in response to the state of at least one of the set switch means and the resume switch means and the state of the electronical control means. The improvement described here comprises the electronical control means sets the power supply control switch means into such a state that supply of power to the electronical control means is turned OFF, when vehicle speed information is not memorized in the vehicle speed memory.

Kawata, S.; Hyodo, H.

1987-03-03T23:59:59.000Z

128

Optimal Flight Speed of Birds  

Science Journals Connector (OSTI)

...research-article Optimal Flight Speed of Birds Anders Hedenstrom Thomas Alerstam The speed of birds in flapping flight...when interpreted in the light of optimization theory, may...and review of optimal flight speeds of birds, based on foraging...

1995-01-01T23:59:59.000Z

129

High Speed Particle Image Velocimetry Overview  

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

Speed Particle Image Velocimetry Speed Particle Image Velocimetry Overview The Department of Energy's National Energy Technology Laboratory is seeking licensing partners interested in implementing U.S. Non- provisional Patent Application 12/765,317 entitled "Method of Particle Trajectory Recognition in Particle Flows of High Particle Concentration Using a Candidate Trajectory Tree Process with Variable Search Areas." This patent application discloses a novel method to simultaneously track the motion of high numbers of object images under extreme, high concen- tration conditions. Although the software is designed to simultaneously track large numbers of particle images in flow fields, it can track any type of object whose locations are available at consecutive time increments (e.g.,

130

Adaptive pitch control for variable speed wind turbines  

DOE Patents (OSTI)

An adaptive method for adjusting blade pitch angle, and controllers implementing such a method, for achieving higher power coefficients. Average power coefficients are determined for first and second periods of operation for the wind turbine. When the average power coefficient for the second time period is larger than for the first, a pitch increment, which may be generated based on the power coefficients, is added (or the sign is retained) to the nominal pitch angle value for the wind turbine. When the average power coefficient for the second time period is less than for the first, the pitch increment is subtracted (or the sign is changed). A control signal is generated based on the adapted pitch angle value and sent to blade pitch actuators that act to change the pitch angle of the wind turbine to the new or modified pitch angle setting, and this process is iteratively performed.

Johnson, Kathryn E. (Boulder, CO); Fingersh, Lee Jay (Westminster, CO)

2012-05-08T23:59:59.000Z

131

How to Avoid Overestimating Variable Speed Drive Savings  

E-Print Network (OSTI)

. Measure full flow power, rather than assuming it is the same as motor nameplate or design power. For many pump and fan systems, none of the eight factors will apply, or their effects will be negligible. However, analysts should consider their applicability...

Maxwell, J. B.

2005-01-01T23:59:59.000Z

132

Residential Cold Climate Heat Pump with Variable-Speed Technology  

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

Lead Performer: Unico Systems - St. Louis, MO Partners: -- Oak Ridge National Laboratory - Oak Ridge, TN -- Purdue University - West Lafayette, IN -- Emerson Electric - St. Louis, MO -- Invention House - St. Louis, MO

133

Protein Folding Pathways Implementing Dihedral Angle Variable Speed  

Science Journals Connector (OSTI)

Protein folding remains as an impossible riddle biologist must ... requirements make it difficult to obtain clues regarding protein folding nature. The procedure presented in this paper...

Mikel Diez; Victor Petuya; Mónica Urizar…

2012-01-01T23:59:59.000Z

134

Replacement, Variable-Speed Motors for Furnaces, Syracuse, New...  

Energy Savers (EERE)

replace- ment for PSC motors in many homes. To date, CARB has upgraded six systems with Concept 3 motors. Upgrading a fan motor is usually very straightforward. Once...

135

Residential Cold Climate Heat Pump with Variable-Speed Technology...  

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

Laboratory - Oak Ridge, TN -- Purdue University - West Lafayette, IN -- Emerson Electric - St. Louis, MO -- Invention House - St. Louis, MO DOE Funding: 2,000,000 Cost...

136

Evaluation of Retrofit Variable-Speed Furnace Fan Motors  

SciTech Connect

In conjunction with the New York State Energy Research and Development Authority (NYSERDA) and Proctor Engineering Group, Ltd. (PEG), the Consortium for Advanced Residential Buildings (CARB) has evaluated the Concept 3 (tm) replacement motors for residential furnaces. These brushless, permanent magnet (BPM) motors can use much less electricity than their PSC (permanent split capacitor) predecessors. This evaluation focuses on existing homes in the heating-dominated climate of upstate New York with the goals of characterizing field performance and cost-effectiveness. The results of this study are intended to be useful to home performance contractors, HVAC contractors, and home efficiency program stakeholders. The project includes eight homes in and near Syracuse, NY. Tests and monitoring was performed both before and after fan motors were replaced. Average fan power reductions were approximately 126 Watts during heating and 220 Watts during cooling operation. Over the course of entire heating and cooling seasons, these translated into average electric energy savings of 163 kWh. Average cost savings were $20 per year. Homes where the fan was used outside of heating and cooling mode saved an additional $42 per year on average. Results indicate that BPM replacement motors will be most cost-effective in HVAC systems with longer run times and relatively low duct static pressures. More dramatic savings are possible if occupants use the fan-only setting when there is no thermal load. There are millions of cold-climate, U.S. homes that meet these criteria, but the savings in most homes tested in this study were modest.

Aldrich, R.; Williamson, J.

2014-01-01T23:59:59.000Z

137

Best Practice for Energy Efficient Cleanrooms: Variable Speed Pumping  

E-Print Network (OSTI)

the design water flow, a smaller motor would be required toVSD) motor while maintaining desirable water temperatures

Xu, Tengfang

2005-01-01T23:59:59.000Z

138

High speed transient sampler  

DOE Patents (OSTI)

A high speed sampler comprises a meandered sample transmission line for transmitting an input signal, a straight strobe transmission line for transmitting a strobe signal, and a plurality of sampling gates along the transmission lines. The sampling gates comprise a four terminal diode bridge having a first strobe resistor connected from a first terminal of the bridge to the positive strobe line, a second strobe resistor coupled from the third terminal of the bridge to the negative strobe line, a tap connected to the second terminal of the bridge and to the sample transmission line, and a sample holding capacitor connected to the fourth terminal of the bridge. The resistance of the first and second strobe resistors is much higher than the signal transmission line impedance in the preferred system. This results in a sampling gate which applies a very small load on the sample transmission line and on the strobe generator. The sample holding capacitor is implemented using a smaller capacitor and a larger capacitor isolated from the smaller capacitor by resistance. The high speed sampler of the present invention is also characterized by other optimizations, including transmission line tap compensation, stepped impedance strobe line, a multi-layer physical layout, and unique strobe generator design. A plurality of banks of such samplers are controlled for concatenated or interleaved sample intervals to achieve long sample lengths or short sample spacing. 17 figs.

McEwan, T.E.

1995-11-28T23:59:59.000Z

139

High speed transient sampler  

DOE Patents (OSTI)

A high speed sampler comprises a meandered sample transmission line for transmitting an input signal, a straight strobe transmission line for transmitting a strobe signal, and a plurality of sampling gates along the transmission lines. The sampling gates comprise a four terminal diode bridge having a first strobe resistor connected from a first terminal of the bridge to the positive strobe line, a second strobe resistor coupled from the third terminal of the bridge to the negative strobe line, a tap connected to the second terminal of the bridge and to the sample transmission line, and a sample holding capacitor connected to the fourth terminal of the bridge. The resistance of the first and second strobe resistors is much higher than the signal transmission line impedance in the preferred system. This results in a sampling gate which applies a very small load on the sample transmission line and on the strobe generator. The sample holding capacitor is implemented using a smaller capacitor and a larger capacitor isolated from the smaller capacitor by resistance. The high speed sampler of the present invention is also characterized by other optimizations, including transmission line tap compensation, stepped impedance strobe line, a multi-layer physical layout, and unique strobe generator design. A plurality of banks of such samplers are controlled for concatenated or interleaved sample intervals to achieve long sample lengths or short sample spacing.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

140

Can Satellite Sampling of Offshore Wind Speeds Realistically Represent Wind Speed Distributions? Part II: Quantifying Uncertainties Associated with Distribution Fitting Methods  

Science Journals Connector (OSTI)

Remote sensing tools represent an attractive proposition for measuring wind speeds over the oceans because, in principle, they also offer a mechanism for determining the spatial variability of flow. Presented here is the continuation of research ...

S. C. Pryor; M. Nielsen; R. J. Barthelmie; J. Mann

2004-05-01T23:59:59.000Z

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


141

wind speed | OpenEI  

Open Energy Info (EERE)

speed speed Dataset Summary Description GIS data for offshore wind speed (meters/second). Specified to Exclusive Economic Zones (EEZ).Wind resource based on NOAA blended sea winds and monthly wind speed at 30km resolution, using a 0.11 wind sheer to extrapolate 10m - 90m. Annual average >= 10 months of data, no nulls. Source National Renewable Energy Laboratory (NREL) Date Released Unknown Date Updated Unknown Keywords GIS global NOAA NREL offshore wind wind speed Data application/zip icon Download Shapefile (zip, 18.5 MiB) Quality Metrics Level of Review Some Review Comment Temporal and Spatial Coverage Frequency Time Period License License Other or unspecified, see optional comment below Comment Please cite NREL and NOAA Rate this dataset Usefulness of the metadata

142

Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM)  

E-Print Network (OSTI)

An interesting alternative for today's high efficiency variable speed drives is the Permanent Magnet-Assisted Synchronous Reluctance Motor drive, which belongs to the family of brushless synchronous AC motor drives. Generally, the reluctance torque...

Chakali, Anil K.

2011-02-22T23:59:59.000Z

143

Forecasting wind speed financial return  

E-Print Network (OSTI)

The prediction of wind speed is very important when dealing with the production of energy through wind turbines. In this paper, we show a new nonparametric model, based on semi-Markov chains, to predict wind speed. Particularly we use an indexed semi-Markov model that has been shown to be able to reproduce accurately the statistical behavior of wind speed. The model is used to forecast, one step ahead, wind speed. In order to check the validity of the model we show, as indicator of goodness, the root mean square error and mean absolute error between real data and predicted ones. We also compare our forecasting results with those of a persistence model. At last, we show an application of the model to predict financial indicators like the Internal Rate of Return, Duration and Convexity.

D'Amico, Guglielmo; Prattico, Flavio

2013-01-01T23:59:59.000Z

144

Adjustable Speed Drive Industrial Applications  

E-Print Network (OSTI)

Electric motors are significant users of electricity in the United States. Approximately 66 percent of the total electricity in the U.S. is used by electric motors. Electronic adjustable speed drives (ASDs) can save energy, lower maintenance cost...

Poole, J. N.

145

Speed Limit of Magnetic Recording  

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

1. The linac's beam, made of tightly packed bunches of electrons traveling close to the speed of light, creates magnetic pulses that are some of the world's strongest - at up to...

146

Information superhighway approaches light speed  

Science Journals Connector (OSTI)

Nothing moves faster than light in a vacuum but a new kind of optical fibre transports large volumes of data at 99.7 per cent of this speed limit

2013-01-01T23:59:59.000Z

147

Observational constraint on the varying speed of light theory  

E-Print Network (OSTI)

The varying speed of light (VSL) theory is controversial. It succeeds in explaining some cosmological problems, but on the other hand it is excluded by mainstream physics because it will shake the foundation of physics. In the present paper, we devote ourselves to test whether the speed of light is varying from the observational data of the type Ia Supernova, Baryon Acoustic Oscillation, Observational $H(z)$ data and Cosmic Microwave Background (CMB). We select the common form $c(t)=c_0a^n(t)$ with the contribution of dark energy and matter, where $c_0$ is the current value of speed of light, $n$ is a constant, and consequently construct a varying speed of light dark energy model (VSLDE). The combined observational data show a much trivial constraint $n=-0.0033 \\pm 0.0045$ at 68.3\\% confidence level, which indicates that the speed of light may be a constant with high significance. By reconstructing the time-variable $c(t)$, we find that the speed of light almost has no variation for redshift $z < 10^{-1}$....

Qi, Jing-Zhao; Liu, Wen-Biao

2014-01-01T23:59:59.000Z

148

Combination of Speed Stroke Grinding and High Speed Grinding with Regard to Sustainability  

E-Print Network (OSTI)

Stress Model for Speed Stroke Grinding of Hardened SteelStresses in Speed Stroke Grinding via FEA Simulation andCombination of Speed Stroke Grinding and High Speed Grinding

Linke, Barbara; Duscha, Michael; Klocke, Fritz; Dornfeld, David

2011-01-01T23:59:59.000Z

149

Variable Speed Drive Volumetric Tracking (VSDVT) for Airflow Control in Variable Air Volume (VAV) Systems  

E-Print Network (OSTI)

Volume Systems.? Proceedings of ACEEE 1994 Summer Study on Energy Efficiency in Buildings, Vol. 5, pp. 219-223. 3. Liu M., Zhu Y., Claridge D.E., and White E., 1997. ?Impact of Static Pressure Set Level on HVAC Energy Consumption and Indoor... Volume Systems.? Proceedings of ACEEE 1994 Summer Study on Energy Efficiency in Buildings, Vol. 5, pp. 219-223. 3. Liu M., Zhu Y., Claridge D.E., and White E., 1997. ?Impact of Static Pressure Set Level on HVAC Energy Consumption and Indoor...

Liu, M.

2002-01-01T23:59:59.000Z

150

Closed Loop Speed Control of Induction Generator with Scalar-control Inverters  

Science Journals Connector (OSTI)

Abstract A closed loop speed control for an induction generator is presented. The system was developed for a space vector modulation-voltage source inverter and the three-phase squirrel-cage induction generator to regulate speed and generator voltages with scalar control technique. The aim of this research was to a generated voltage with a constant speed at variable mechanical torque of prime mover. The simulation results show a good performance of the system can be achieved by the proposed speed controller.

Anaphat Upasan; Yuttana Kumsuwan

2013-01-01T23:59:59.000Z

151

1980–2010 Variability in U.K. Surface Wind Climate  

Science Journals Connector (OSTI)

The climate of the northeast Atlantic region comprises substantial decadal variability in storminess. It also exhibits strong inter- and intra-annual variability in extreme high and low wind speed episodes. Here the authors quantify and discuss ...

Nick Earl; Steve Dorling; Richard Hewston; Roland von Glasow

2013-02-01T23:59:59.000Z

152

Speeding Up Zeolite Evaluation for Carbon Capture  

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

Speeding Up Zeolite Evaluation for Carbon Capture Speeding Up Zeolite Evaluation for Carbon Capture Zeolite.png Schematic of an important class of porous materials known as...

153

Electric motor with controllable speed and torque  

Science Journals Connector (OSTI)

The proposed electric motor is characterized by controllable speed and torque ... shaft, at constant rotor speed. In this motor, the torque at the output shaft increases...

R. G. Khadeev

2011-01-01T23:59:59.000Z

154

Controlling proton source speeds catalyst | EMSL  

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

Controlling proton source speeds catalyst Controlling proton source speeds catalyst Nickel-based catalyst three times faster with adjustments to key acid Research showing that...

155

Alternative Fuels Data Center: Low-Speed Vehicle and Medium-Speed Electric  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle and Low-Speed Vehicle and Medium-Speed Electric Vehicle (EV) Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle and Medium-Speed Electric Vehicle (EV) Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle and Medium-Speed Electric Vehicle (EV) Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle and Medium-Speed Electric Vehicle (EV) Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle and Medium-Speed Electric Vehicle (EV) Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle and Medium-Speed Electric Vehicle (EV) Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed

156

OpenEI - wind speed  

Open Energy Info (EERE)

NREL GIS Data: Global NREL GIS Data: Global Offshore Wind http://en.openei.org/datasets/node/869 GIS data for offshore wind speed (meters/second).  Specified to Exclusive Economic Zones (EEZ).Wind resource based on NOAA blended sea winds and monthly wind speed at 30km resolution, using a 0.11 wind sheer to extrapolate 10m - 90m.  Annual average  >= 10 months of data, no nulls. License

Type of License:  Other (please specify below)

157

100-Year Return Value Estimates for Ocean Wind Speed and Significant Wave Height from the ERA-40 Data  

E-Print Network (OSTI)

and time variability of significant wave height and wind speed on the prediction of their extreme values of this dataset makes it ideal for the study of extreme wind and wave phenomena over the whole globe. Initial100-Year Return Value Estimates for Ocean Wind Speed and Significant Wave Height from the ERA-40

Haak, Hein

158

14 - Doxford low speed engines  

Science Journals Connector (OSTI)

Publisher Summary This chapter discusses low speed diesel engines from Doxford. Doxford is British firm that manufactured the distinctive Doxford opposed-piston (OP) low speed two-stroke engines. Doxford J-type engines were built in long and short stroke versions in bore sizes of 580, 670 and 760 mm, and with three to nine cylinders delivering up to around 20 000 kW. The engine is a single-acting two-stroke opposed-piston type with each cylinder having two pistons that move in opposite directions from a central combustion chamber. The last J-type engines were turbocharged on the constant pressure system following a changeover from the original impulse charging system. Three- and four-cylinder engines have only one turbocharger, mounted at the forward or aft end, while two or three chargers have been fitted to seven-, eight-, and nine-cylinder engines. Between each turbocharger and the engine entablature is a finned-tubed seawater-cooled after cooler. An electric auxiliary blower is provided for slow running or emergency duties. In its final years the company designed and produced the unusual three-cylinder 58JS3C model that developed 4050 kW at 220 rev/min and was specified to power several small containerships. The 58JS3C design was based on the J-type but with refinements addressing the higher rotational speed and relatively short piston stroke.

2004-01-01T23:59:59.000Z

159

Estimation of the Design Wind Speed  

Science Journals Connector (OSTI)

The modern approach to the specification of the design wind speed favours the explicit format which directly presents the design value of the wind speed instead of hiding the value behind the product of the chara...

Michael Kasperski

2013-01-01T23:59:59.000Z

160

Wind speed vertical distribution at Mt Graham  

Science Journals Connector (OSTI)

......October 2010 research-article Papers Wind speed vertical distribution at Mt Graham...characterization of the vertical distribution of wind speed, V(h), is fundamental for an...many different reasons: (i) the wind speed shear contributes to trigger optical......

S. Hagelin; E. Masciadri; F. Lascaux

2010-10-01T23:59:59.000Z

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


161

PHYSICS 359 THE SPEED OF LIGHT  

E-Print Network (OSTI)

PHYSICS 359 THE SPEED OF LIGHT INTRODUCTION: The first evidence that light propagates with a finite from or approaching Jupiter. The first accurate measurements of the speed of light were made at a distance of about 9 km. Modern measurements of the speed of light are made by quite different methods

Landstreet, John D.

162

The Speed-of-Light Catastrophe  

Science Journals Connector (OSTI)

...July 1989 research-article The Speed-of-Light Catastrophe H. Ardavan It is shown...coordinates, c is the propagation speed of the waves described by the retarded...source moving on a curved path whose speed is in parts smaller and in parts...

1989-01-01T23:59:59.000Z

163

Redshift drift in varying speed of light cosmology  

Science Journals Connector (OSTI)

Abstract We derive a redshift drift formula within the framework of varying speed of light (VSL) theory using the specific ansatz for the variability of c ( t ) = c 0 a n ( t ) . We show that negative values of the parameter n, which correspond to diminishing value of the speed of light during the evolution of the universe, effectively rescale dust matter to become little negative pressure matter, and the cosmological constant to became phantom. Positive values of n (growing c ( t ) ) make VSL model to become more like Cold Dark Matter (CDM) model. Observationally, there is a distinction between the VSL model and the ?CDM model for the admissible values of the parameter n ? ? 10 ? 5 , though it will be rather difficult to detect by planned extremely large telescopes (EELT, TMT, GMT) within their accuracy.

Adam Balcerzak; Mariusz P. Da?browski

2014-01-01T23:59:59.000Z

164

High speed sampler and demultiplexer  

DOE Patents (OSTI)

A high speed sampling demultiplexer based on a plurality of sampler banks, each bank comprising a sample transmission line for transmitting an input signal, a strobe transmission line for transmitting a strobe signal, and a plurality of sampling gates at respective positions along the sample transmission line for sampling the input signal in response to the strobe signal. Strobe control circuitry is coupled to the plurality of banks, and supplies a sequence of bank strobe signals to the strobe transmission lines in each of the plurality of banks, and includes circuits for controlling the timing of the bank strobe signals among the banks of samplers. Input circuitry is included for supplying the input signal to be sampled to the plurality of sample transmission lines in the respective banks. The strobe control circuitry can repetitively strobe the plurality of banks of samplers such that the banks of samplers are cycled to create a long sample length. Second tier demultiplexing circuitry is coupled to each of the samplers in the plurality of banks. The second tier demultiplexing circuitry senses the sample taken by the corresponding sampler each time the bank in which the sampler is found is strobed. A plurality of such samples can be stored by the second tier demultiplexing circuitry for later processing. Repetitive sampling with the high speed transient sampler induces an effect known as "strobe kickout". The sample transmission lines include structures which reduce strobe kickout to acceptable levels, generally 60 dB below the signal, by absorbing the kickout pulses before the next sampling repetition.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

165

High speed sampler and demultiplexer  

DOE Patents (OSTI)

A high speed sampling demultiplexer based on a plurality of sampler banks, each bank comprising a sample transmission line for transmitting an input signal, a strobe transmission line for transmitting a strobe signal, and a plurality of sampling gates at respective positions along the sample transmission line for sampling the input signal in response to the strobe signal. Strobe control circuitry is coupled to the plurality of banks, and supplies a sequence of bank strobe signals to the strobe transmission lines in each of the plurality of banks, and includes circuits for controlling the timing of the bank strobe signals among the banks of samplers. Input circuitry is included for supplying the input signal to be sampled to the plurality of sample transmission lines in the respective banks. The strobe control circuitry can repetitively strobe the plurality of banks of samplers such that the banks of samplers are cycled to create a long sample length. Second tier demultiplexing circuitry is coupled to each of the samplers in the plurality of banks. The second tier demultiplexing circuitry senses the sample taken by the corresponding sampler each time the bank in which the sampler is found is strobed. A plurality of such samples can be stored by the second tier demultiplexing circuitry for later processing. Repetitive sampling with the high speed transient sampler induces an effect known as ``strobe kickout``. The sample transmission lines include structures which reduce strobe kickout to acceptable levels, generally 60 dB below the signal, by absorbing the kickout pulses before the next sampling repetition. 16 figs.

McEwan, T.E.

1995-12-26T23:59:59.000Z

166

Active control system for high speed windmills  

DOE Patents (OSTI)

A pump stroke is matched to the operating speed of a high speed windmill. The windmill drives a hydraulic pump for a control. Changes in speed of a wind driven shaft open supply and exhaust valves to opposite ends of a hydraulic actuator to lengthen and shorten an oscillating arm thereby lengthening and shortening the stroke of an output pump. Diminishing wind to a stall speed causes the valves to operate the hydraulic cylinder to shorten the oscillating arm to zero. A pressure accumulator in the hydraulic system provides the force necessary to supply the hydraulic fluid under pressure to drive the actuator into and out of the zero position in response to the windmill shaft speed approaching and exceeding windmill stall speed. 4 figs.

Avery, D.E.

1988-01-12T23:59:59.000Z

167

High-Pressure Flame Speed Measurements  

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

addition on flame speeds of hydrocarbon fuels 3. Soot formation and explosive gasification in burning droplets of dieselbiodieselethanol blends C. K. Law Princeton...

168

Plan to speed up drug review approved  

Science Journals Connector (OSTI)

Plan to speed up drug review approved ... Proposed changes in the New Drug Application procedure will shorten review times, reduce paperwork, and save money ...

DAVID HANSON

1982-07-12T23:59:59.000Z

169

Wind Speed Prediction Via Time Series Modeling.  

E-Print Network (OSTI)

??Projected construction of nearby wind farms motivates this study of statistical forecasting of wind speed, for which accurate prediction is critically important to the fluid… (more)

Alexander, Daniel

2009-01-01T23:59:59.000Z

170

High-speed digital color imaging pyrometry  

Science Journals Connector (OSTI)

Temperature measurements of high-explosive and combustion processes are difficult to obtain due to the speed and environment of the events. To overcome these challenges, we have...

Densmore, John M; Biss, Matthew M; McNesby, Kevin L; Homan, Barrie E

2011-01-01T23:59:59.000Z

171

Superfast Search Engine Speeds Past the Competition | U.S. DOE Office of Science (SC)  

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

Superfast Search Engine Speeds Past the Competition Superfast Search Engine Speeds Past the Competition Stories of Discovery & Innovation Superfast Search Engine Speeds Past the Competition Enlarge Photo Getty Images Bitmap indices translate variable values into strings of bits, or 1's and 0's. These indices tend to be very efficient because computer processors are optimized to perform so-called logical operations on bits. Enlarge Photo Illustration: A. Tovey Source: Wu, Otto, and 05.31.11 Superfast Search Engine Speeds Past the Competition Software developed for analyzing physics data finds powerful commercial applications. Our world is increasingly data-driven, whether we are searching for information on our home computer, accessing databases for everything from medical records to financial data, or scanning the depths of outer

172

High speed imager test station  

DOE Patents (OSTI)

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

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

1995-11-14T23:59:59.000Z

173

High speed imager test station  

DOE Patents (OSTI)

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

Yates, George J. (Santa Fe, NM); Albright, Kevin L. (Los Alamos, NM); Turko, Bojan T. (Moraga, CA)

1995-01-01T23:59:59.000Z

174

Reliability models of wind farms considering wind speed correlation and WTG outage  

Science Journals Connector (OSTI)

Abstract Wind speed correlation and wind turbine generator (WTG) outage are two factors affecting the reliability model of wind farms, but they are not addressed simultaneously in the existing literature. Meanwhile, WTG outage is reported to be dependent with wind speed to some extent. Therefore, the extended reliability models of wind farms incorporating both of these two factors and the dependency between WTG outage and wind speed are proposed in this paper. To consider the uncertainties and dependencies of wind speed and WTG failure, Copula method is applied to simulate correlated random variables representing for wind speed and the number of failed WTG units. Moreover, the linear apportioning technique is used to create multistate reliability models of wind farms from hourly wind power models. A number of sensitivity analyses on the modified IEEE RTS with wind power are conducted to validate the proposed reliability models for generation adequacy assessment. Case studies show that the generation adequacy indices increase with the correlation of wind speed and WTG forced outage rate (FOR). It is meaningful to point out that the effect of dependency between wind speed and WTG FOR on generation adequacy is minimal when WTG outages are independent, but it will be substantially larger when WTG outages are highly dependent. The proposed multistate reliability models of wind farms provide foundation for the reliability assessment of power systems with wind power integrated.

Fan Chen; Fangxing Li; Zhinong Wei; Guoqiang Sun; Jun Li

2015-01-01T23:59:59.000Z

175

Heuristic correction of wind speed mesoscale models simulations for wind farms prospecting and micrositing  

Science Journals Connector (OSTI)

Abstract The distribution of surface-level wind speeds over a given area is important information that is related to several processes in wind farm prospecting, design and micrositing. This information is often obtained from simulations using mesoscale models that take variables from global models as starting points. Improved outputs from mesoscale models can lead to reduced error compared to real wind speeds in the study area if in situ wind speed measurements are available. In this paper, we present several techniques to correct surface wind speed simulations from mesoscale models using data from measuring stations in wind farms. Specifically, we propose different heuristic corrections of the outputs from mesoscale models by means of surface fitting between the Weibull parameters of the wind speed series (from the mesoscale model) and those from the measuring stations (real wind speed) in the wind farm. The proposed methodology has direct applications in wind farm design, site prospection and micrositing. The good performance of our method is evident in the more accurate surface wind speeds obtained from mesoscale models in two wind farm prospection sites in Spain, where several measuring towers are installed.

B. Saavedra-Moreno; S. Salcedo-Sanz; C. Casanova-Mateo; J.A. Portilla-Figueras; L. Prieto

2014-01-01T23:59:59.000Z

176

Relationship between design speed and operating speed at horizontal curves on suburban arterials  

E-Print Network (OSTI)

RELATIONSHIP BETWEEN DESIGN SPEED AND OPERATING SPEED AT HORIZONTAL CURVES ON SUBURBAN ARTERIALS A Thesis by CARL BRIAN SHAMBURGER Submitted to the OIIice of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1995 Major Subject: Civil Engineering RELATIONSHIP BETWEEN DESIGN SPEED AND OPERATING SPEED AT HORIZONTAL CURVES ON SUBURBAN ARTERIALS A Thesis by CARL BRIAN SHAMBURGER Submitted to Texas A&M University...

Shamburger, Carl Brian

2012-06-07T23:59:59.000Z

177

Measuring the Impacts of Speed Reduction Technologies  

E-Print Network (OSTI)

-Seoud, Edward Anderson #12;Background Identified as a problem area Sharp curve & excessive speed High crash;Comparison of Mean Zones - Southbound, Commercial Vehicles 45 46 47 48 49 50 51 52 53 54 55 -1300 -1100 -900-70 Speed Category Before After #12;At nearest rest area

Bertini, Robert L.

178

Aeroacoustic sources of high speed maglev trains  

Science Journals Connector (OSTI)

Noise has been identified as a potential source of concern associated with the introduction of high speed maglev trains into the existing transportation system in the United States. The first operational maglev systems have been shown to generate high noise levels at high speeds with noise levels over 100 dBA at 25 m typical for the maximum cruising speeds. At speeds greater than 150 miles per hour the dominant noise source is of aerodynamic origin proportional to the 6th power of velocity at high speeds and 8th power dependency at very high speeds. An investigation of the noisegenerated by maglev systems was conducted to determine noise sources develop noise criteria for high speed maglev systems prepare design guidelines for noise control and recommend an acoustic test facility for maglev research. This paper describes the findings of the study including recommendations for further research to develop a better understanding of the aerodynamic soundgeneration associated with high speed maglev operations. [Work performed under contract to U.S. Department of Transportation as part of the National Maglev Initiative.

Carl E. Hanson

1994-01-01T23:59:59.000Z

179

On the constancy of light speed  

E-Print Network (OSTI)

Method given for intuitively visualizing constancy of light speed. Using mass-energy equivalence, we can show with the help of simple thought experiments, that velocity time dilation and gravitational time dilation are a necessary consequence of principle of relativity. Speed of light is discussed in the context of each kind of time dilation.

Abdul Rouf

2009-11-15T23:59:59.000Z

180

Fact #719: March 19, 2012 Nearly 14% of New Car Sales have Continuously Variable Transmissions  

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

Continuously variable transmissions (CVT) offer an infinite number of gear ratios that allow the engine to operate near peak efficiency throughout a wide range of vehicle speeds which improves fuel...

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


181

Variable Light-Cone Theory of Gravity  

E-Print Network (OSTI)

We show how to reformulate Variable Speed of Light Theories (VSLT) in a covariant fashion as Variable Light-Cone Theories (VLCT) by introducing two vierbein bundles each associated with a distinct metric. The basic gravitational action relates to one bundle while matter propagates relative to the other in a conventional way. The variability of the speed of light is represented by the variability of the matter light-cone relative to the gravitational light-cone. The two bundles are related locally by an element M, of SL(4,R). The dynamics of the field M is that of a SL(4,R)-sigma model gauged with respect to local (orthochronous) Lorentz transformations on each of the bundles. Only the ``massless'' version of the model with a single new coupling, F, that has the same dimensions as Newton's constant $G_N$, is considered in this paper. When F vanishes the theory reduces to standard General Relativity. We verify that the modified Bianchi identities of the model are consistent with the standard conservation law for the matter energy-momentum tensor in its own background metric. The implications of the model for some simple applications are examined, the Newtonian limit, the flat FRW universe and the spherically symmetric static solution.

I. T. Drummond

1999-08-20T23:59:59.000Z

182

Carderock 2-ft Variable Pressure Cavitation Water Tunnel | Open Energy  

Open Energy Info (EERE)

2-ft Variable Pressure Cavitation Water Tunnel 2-ft Variable Pressure Cavitation Water Tunnel Jump to: navigation, search Basic Specifications Facility Name Carderock 2-ft Variable Pressure Cavitation Water Tunnel Overseeing Organization United States Naval Surface Warfare Center Hydrodynamic Testing Facility Type Tunnel Beam(m) 0.6 Depth(m) 0.6 Water Type Freshwater Cost(per day) Contact POC Special Physical Features The 2-Foot Variable Pressure Cavitation Water Tunnel is a vertical plane, closed recirculating, variable-speed, variable-pressure, open jet test section, closed jet test section, and semi-rectangular test section. Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Velocity(m/s) 17 Recirculating Yes

183

Carderock 3-ft Variable Pressure Cavitation Water Tunnel | Open Energy  

Open Energy Info (EERE)

Variable Pressure Cavitation Water Tunnel Variable Pressure Cavitation Water Tunnel Jump to: navigation, search Basic Specifications Facility Name Carderock 3-ft Variable Pressure Cavitation Water Tunnel Overseeing Organization United States Naval Surface Warfare Center Hydrodynamic Testing Facility Type Tunnel Beam(m) 0.7 Depth(m) 0.7 Water Type Freshwater Cost(per day) Contact POC Special Physical Features The 3-ft Variable Pressure Cavitation Water Tunnel is a vertical plane, closed recirculating with resorber, variable-speed, variable-pressure, two interchangeable circular test sections. Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Velocity(m/s) 25.8 Recirculating Yes Wind Capabilities Wind Capabilities None

184

Speeding Up Zeolite Evaluation for Carbon Capture  

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

Speeding Up Speeding Up Zeolite Evaluation for Carbon Capture Speeding Up Zeolite Evaluation for Carbon Capture Zeolite.png Schematic of an important class of porous materials known as zeolites. The large red structure in the center of this periodic structure is a cavity that might be a good candidate for adsorption of a gas such as carbon dioxide. The seven small red areas at the corners (plus the one hidden by the yellow ball) are not suitable and need to be eliminated from studies that attempt to predict guest-related properties using molecular simulation techniques. A new method developed at NERSC uses software to differentiate between suitable and unsuitable pockets, thereby speeding up discovery of new materials. Why it Matters: Capturing and sequestering waste carbon dioxide (CO2) is a

185

Low Speed Unsteady Aerodynamics Soumitra Banerjee*  

E-Print Network (OSTI)

Low Speed Unsteady Aerodynamics Soumitra Banerjee* Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061 Unsteady aerodynamics is the study of fluid flow, where the flow field changes with time. The unsteadiness is significant in many aerodynamic applications; few examples

Patil, Mayuresh

186

Wind Speed Forecasting for Power System Operation  

E-Print Network (OSTI)

In order to support large-scale integration of wind power into current electric energy system, accurate wind speed forecasting is essential, because the high variation and limited predictability of wind pose profound challenges to the power system...

Zhu, Xinxin

2013-07-22T23:59:59.000Z

187

Clinton plan to speed cancer drug approval  

Science Journals Connector (OSTI)

Clinton plan to speed cancer drug approval ... Accelerated approval and three other proposals "will affect at least 100 drugs now being studied," he notes, cutting FDA review time for some of these drugs from 12 months to six months. ...

1996-04-08T23:59:59.000Z

188

Assessment of Wind Speed Dependent Prediction Error  

Science Journals Connector (OSTI)

The investigations in this chapter follow the idea that the prediction error quantitatively depends on the meteorological situation that has to be predicted. As a first approach the wind speed as a main indicator...

Dr. Matthias Lange; Dr. Ulrich Focken

2006-01-01T23:59:59.000Z

189

The invariance of the speed of light  

E-Print Network (OSTI)

We show that the conclusion of a recent experiment [arXiv:0912.3934] that claims to have discovered that "the speed of light seems to depend on the motion of the observer" is wrong.

Jerrold Franklin

2010-02-21T23:59:59.000Z

190

Note on Varying Speed of Light Cosmologies  

E-Print Network (OSTI)

The various requirements on a consistent varying speed of light (`VSL') theory are surveyed, giving a short check-list of issues that should be satisfactorily handled by such theories.

George F R Ellis

2007-03-29T23:59:59.000Z

191

One-way speed of light?  

E-Print Network (OSTI)

This is a comment on a paper by Greaves, Rodriguez, and Ruiz-Camacho [Am. J. Phys. 77, 894 (2009)] which reports a measurement of the one-way speed of light.

J. Finkelstein

2009-11-18T23:59:59.000Z

192

Speed selection for coupled wave equations  

E-Print Network (OSTI)

We discuss models for coupled wave equations describing interacting fields, focusing on the speed of travelling wave solutions. In particular, we propose a general mechanism for selecting and tuning the speed of the corresponding (multi-component) travelling wave solutions under certain physical conditions. A number of physical models (molecular chains, coupled Josephson junctions, propagation of kinks in chains of adsorbed atoms and domain walls) are considered as examples.

Mariano Cadoni; Giuseppe Gaeta

2015-01-13T23:59:59.000Z

193

Wind speed vertical distribution at Mt. Graham  

E-Print Network (OSTI)

The characterization of the wind speed vertical distribution V(h) is fundamental for an astronomical site for many different reasons: (1) the wind speed shear contributes to trigger optical turbulence in the whole troposphere, (2) a few of the astroclimatic parameters such as the wavefront coherence time (tau_0) depends directly on V(h), (3) the equivalent velocity V_0, controlling the frequency at which the adaptive optics systems have to run to work properly, depends on the vertical distribution of the wind speed and optical turbulence. Also, a too strong wind speed near the ground can introduce vibrations in the telescope structures. The wind speed at a precise pressure (200 hPa) has frequently been used to retrieve indications concerning the tau_0 and the frequency limits imposed to all instrumentation based on adaptive optics systems, but more recently it has been proved that V_200 (wind speed at 200 hPa) alone is not sufficient to provide exhaustive elements concerning this topic and that the vertical d...

Hagelin, S; Lascaux, F

2010-01-01T23:59:59.000Z

194

A Multivariate Analysis of Freeway Speed and Headway Data  

E-Print Network (OSTI)

key process is the generation of entry vehicle speeds and vehicle arrival times. It is helpful to find desirable mathematical distributions to model individual speed and headway values, because the individual vehicle speed and arrival time...

Zou, Yajie

2013-11-11T23:59:59.000Z

195

A preliminary evaluation of a speed threshold incident detection algorithm  

E-Print Network (OSTI)

detection algorithm. San Antonio's new traffic management center, TransGuide, uses a new speed based algorithm, The TXDOT (Texas Department of Transportation) Speed algorithm. This research compares the TXDOT Speed algorithm with California algorithm #8...

Kolb, Stephanie Lang

1996-01-01T23:59:59.000Z

196

Einstein's special relativity beyond the speed of light  

Science Journals Connector (OSTI)

...special relativity beyond the speed of light James M. Hill Barry J. Cox...relative velocities greater than the speed of light, and that are complementary to...relative velocities less than the speed of light. The new transformations arise...

2012-01-01T23:59:59.000Z

197

Is the Lorentz limiting speed equal to the Speed of Light? Photons vs Neutrino tests  

E-Print Network (OSTI)

We discuss the possibility that the limiting speed (c_l) appearing in Lorentz equations might be different i.e., slightly larger than the observed speed of light (c_n). We show that such a possibility can be tested by state-of-the-art Michelson-Morley experiments, but also by careful measurement of neutrino speeds. It would indeed suffice to show that c_n light.

Jean-Marie Frere; Simon Mollet; Michel H. G. Tytgat

2012-02-13T23:59:59.000Z

198

A study of the effect of posted speed limits on traffic speeds  

E-Print Network (OSTI)

. 60 C 50 JJ 40 Be fore After tti 0 U Ol DO 4) ts U U C 4) C U 4) I ) 4) 0 40 30 0 20 10 4 t 13. 0 14. 0 Ni 1 epos ts - S. H. 36 Location D-12 - West Columbia CI Be fore IED After 15. 0 FIGURE V. 11, LUSTRAT10N OF A... Distribution Curves for No Change in the Original 60-Nile-Par-Hour Speed Limit in District 12. Each Curve Represents Data Prom 7 Spot Speed Studies in 4 Locations. 37 12. 13. Cumulative Speed Distribution Curves for a Change in Speed Limit From 60 to 55...

Rowan, Neilon Joyce

2012-06-07T23:59:59.000Z

199

Is the Lorentz limiting speed equal to the speed of light? Photons vs neutrino tests  

Science Journals Connector (OSTI)

We discuss the possibility that the “limiting speed” c limit (c l ...) appearing in Lorentz equations might be different (i.e. slightly larger) t...

Jean-Marie Frčre; Simon Mollet; Michel H. G. Tytgat

2012-11-01T23:59:59.000Z

200

The Brazil Technology Center Speeds the Pace of Innovation |...  

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

Brazil Technology Center Speeds the Pace of Innovation The Brazil Technology Center Speeds the Pace of Innovation Bruno Betoni Parodi 2012.09.06 (Please find Portuguese translation...

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


201

Reduction of Emissions from a High Speed Ferry | Department of...  

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

Emissions from a High Speed Ferry Reduction of Emissions from a High Speed Ferry 2003 DEER Conference Presentation: West Virginia University 2003deerthompson.pdf More Documents &...

202

Energy Department Announces $10 Million to Speed Enhanced Geothermal...  

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

Energy Department Announces 10 Million to Speed Enhanced Geothermal Systems into the Market Energy Department Announces 10 Million to Speed Enhanced Geothermal Systems into the...

203

Alternative Fuels Data Center: Low-Speed Vehicle Definition  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Definition to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Definition on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Definition on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Definition on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Definition on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Definition on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Definition on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Definition A low-speed vehicle is defined as a limited use automobile or truck that has a maximum speed greater than 20 miles per hour (mph) but not more than

204

Clinical recommendations for the use of D-speed film, E-speed film, and xeroradiography  

SciTech Connect

This article assesses the diagnostic utility, radiation dose, equipment reliability, patient acceptance, and costs associated with D-speed film, E-speed film, and dental xeroradiographs for intraoral imaging. From the analysis and review of laboratory studies and clinical trials, conclusions and recommendations are offered. 40 references.

Gratt, B.M.; White, S.C.; Halse, A.

1988-10-01T23:59:59.000Z

205

Universal One-Way Light Speed from a Universal Light Speed Over Closed Paths  

Science Journals Connector (OSTI)

This paper gives two complete and elementary proofs that if the speed of light over closed paths has a universal value c..., then it is possible to synchronize clocks in such a way that the one-way speed of light

Ettore Minguzzi; Alan Macdonald

2003-12-01T23:59:59.000Z

206

MHL High Speed Cavitation | Open Energy Information  

Open Energy Info (EERE)

High Speed Cavitation High Speed Cavitation Jump to: navigation, search Basic Specifications Facility Name MHL High Speed Cavitation Overseeing Organization University of Michigan Hydrodynamics Hydrodynamic Testing Facility Type Channel Length(m) 0.8 Beam(m) 0.2 Depth(m) 0.2 Cost(per day) $2000(+ Labor/Materials) Towing Capabilities Towing Capabilities Yes Maximum Velocity(m/s) 25.9 Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Velocity(m/s) 25.9 Recirculating No Wind Capabilities Wind Capabilities None Control and Data Acquisition Description Custom Data Acquisition System using National Instruments hardware; system compatible with Planing Hull and Floating Beam Dynamometers Number of channels 16 Bandwidth(kHz) 20 Cameras Yes

207

Adjustable Speed Drive Study, Part 2.  

SciTech Connect

Advances in speed control for motors in recent years, notably those in power electronics, have widened the range of application for several adjustable speed drive (ASD) types to include the smaller horsepower sizes. The DC motor drive, formerly in almost universal use for speed control, is being challenged by the high efficiency induction motor/pulse width modulation (PWM) drive; and for special small horsepower size applications, by the permanent magnet motor/PWM inverter drive or by the switched reluctance motor drive. The main characteristics of the several ASD types suitable for small horsepower size applications are discussed, as well as their unwanted side effects: poor power factor, harmonic distortion of the supply, acoustic noise, and electromagnetic interference. A procedure is recommended for determining which, if any, ASD to use.

Wallace, Alan K.; Oregon State University. Dept. of Electrical and Computer Engineering.

1989-08-01T23:59:59.000Z

208

Adjustable Speed Drive Study, Part 1.  

SciTech Connect

Advances in speed control for motors in recent years, notably those in power electronics, have widened the range of application for several adjustable speed drive (ASD) types to include the smaller horsepower sizes. The dc motor drive, formerly in almost universal use for speed control, is being challenged by the high efficiency induction motor/pulse width modulation (PWM) drive; and for special small horsepower size applications, by the permanent magnet motor/PWM inverter drive or by the switched reluctance motor drive. The main characteristics of the several ASD types suitable for small horsepower size applications are discussed, as well as their unwanted side effects: poor power factor, harmonic distortion of the supply, acoustic noise, and electromagnetic interference. A procedure is recommended for determining which, if any, ASD to use. 31 figs., 6 tabs.

Wallace, Alan K.; Oregon State University. Dept. of Electrical and Computer Engineering.

1989-08-01T23:59:59.000Z

209

Adjustable speed drive for residential applications  

SciTech Connect

This paper describes a demonstration of an adjustable speed drive suitable for use in residential applications such as compressors and fans in heat pumps, air conditioners, and refrigerators. The adjustable speed drive uses only a four-diode rectifier and a six-transistor six-diode inverter and does not require a source-frequency filter inductor or capacitor. Motor speed is adjusted with source-frequency phase control eliminating the switching loss and electromagnetic interference caused by the more commonly used high-frequency pulse-width modulation. Low source-current distortion and high power factor are obtained at a full-load operating point which is found using a parametric analysis.

Jungreis, A.M.; Kelley, A.W. [North Carolina State Univ., Raleigh, NC (United States). Dept. of Electrical and Computer Engineering] [North Carolina State Univ., Raleigh, NC (United States). Dept. of Electrical and Computer Engineering

1995-11-01T23:59:59.000Z

210

Measuring the speed of cosmological gravitational waves  

E-Print Network (OSTI)

In general relativity gravitational waves propagate at the speed of light, however in alternative theories of gravity that might not be the case. We study the effects of a modified speed of gravity, $c_T^2$, on the B-modes of the Cosmic Microwave Background (CMB) anisotropy in polarisation. We find that a departure from the light speed value would leave a characteristic imprint on the BB spectrum part induced by tensors, manifesting as a shift in the angular scale of its peaks. We derive constraints by using the available {\\it Planck} and BICEP2 datasets showing how $c_T^2$ can be measured, albeit obtaining weak constraints due to the overall poor accuracy of the current BB power spectrum measurements. The present constraint corresponds to $c_T^2 = 1.30 \\pm 0.79$ and $c_T^2measurements, largely due to the absence of degeneracy with other cosmological parameters.

Marco Raveri; Carlo Baccigalupi; Alessandra Silvestri; Shuang-Yong Zhou

2014-05-30T23:59:59.000Z

211

Sound Speed Perturbations Due to Internal Tides  

Science Journals Connector (OSTI)

Internal tides are perhaps the most prevalent and largest amplitude internal gravity waves in the ocean. They are commonly generated by the scattering of surfacetidal energy into internal modes when the surfacetides propagate on to continental shelves. A portion of the internal tidal energy propagates into the deep ocean. One of the effects of internal tides on underwater acoustic propagation is to perturb the temperature and salinity versus depth profiles and thus the sound speed versus depth profile. Starting with temperature and salinity versus depth profiles from near Eleuthera Island the internal tide eigenfunctions as well as the sound speed profile have been computed for a water depth of 4500 m. Assuming a value for the vertical displacement amplitude of a first vertical mode internal tide the perturbed temperature and salinity profiles have been computed. From these perturbed profiles the consequent perturbed sound speed profiles have been computed for cases of maximum up and down internal tide displacement. The first mode internal tide has no vertical displacement at the sea surface and bottom and a maximum near the base of the main thermocline (depth of about 1200 m). Since the SOFAR axis is also near the base of the main thermocline and since the pressureeffects on sound speed are predominant below the SOFAR axis the sound speed perturbation due to the first mode internal tide is greatest at a depth (about 550 m) above the SOFAR axis. An internal tide with a maximum vertical displacement of 10 m produces a maximum sound speed perturbation of ±0.7 m/sec.

Christopher N. K. Mooers

1973-01-01T23:59:59.000Z

212

On-chip high speed localized cooling using superlattice microrefrigerators  

E-Print Network (OSTI)

cooling, microrefrigerators, optoelectronics, superlattice,in high power, high-speed optoelectronics devices, and

Zhang, Y; Christofferson, J; Shakouri, A; Zeng, G H; Bowers, J E; Croke, E T

2006-01-01T23:59:59.000Z

213

Motion at High Speed Did you read chapter 7  

E-Print Network (OSTI)

fast is "high speed" 50 mph 225 mphp 550 mph 39,000 mph Speed of light: 670,000,000 mph Extends off/20,000 of the speed of li hlight All Motion is relative We must define a reference frame in which to measure/Morley experiment. Albert Michelson Conclusion: Light does not obey Galilean relativity! Relativity and the Speed

Hart, Gus

214

Temporal and spatial variability of wind resources in the United States as derived from the Climate Forecast System Reanalysis  

Science Journals Connector (OSTI)

This study examines the spatial and temporal variability of wind speed at 80 m above ground (the average hub height of most modern wind turbines) in the contiguous United States using Climate Forecast System Reanalysis (CFSR) data from 1979 to ...

Lejiang Yu; Shiyuan Zhong; Xindi Bian; Warren E. Heilman

215

Wind variability in the northwestern part of the Black Sea from the offshore fixed platform observation data  

Science Journals Connector (OSTI)

The statistically ensured estimates of characteristics of temporal variability of wind speed and wind direction are obtained on the basis of ... observations carried out in 1996–2001 at the offshore fixed platfor...

A. V. Garmashov; A. B. Polonskii

2011-12-01T23:59:59.000Z

216

Alternative Fuels Data Center: Limited Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Limited Speed Vehicle Limited Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Limited Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Limited Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Limited Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Limited Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Limited Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Limited Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Limited Speed Vehicle Access to Roadways A limited speed vehicle is defined as a vehicle that is capable of

217

Alternative Fuels Data Center: Low-Speed Vehicle Inspection Exemption  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Inspection Exemption to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Inspection Exemption on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Inspection Exemption on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Inspection Exemption on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Inspection Exemption on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Inspection Exemption on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Inspection Exemption on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Inspection Exemption Low-speed vehicles are exempt from annual state vehicle inspections.

218

Speed estimation using single loop detector outputs  

E-Print Network (OSTI)

...................................................................................10 2.1 Introduction ........................................................................................10 2.2 Vehicle Detectors ...............................................................................10 2.3 Description of the Speed....4 Hourly traffic volumes from the IH-35 test bed in Austin on Oct. 27, 2004 38 Fig 3.5 Layout of the simulated freeway section ...................................................... 41 Fig. 4.1 Average vehicle lengths over time...

Ye, Zhirui

2009-05-15T23:59:59.000Z

219

Speed estimation using single loop detector outputs  

E-Print Network (OSTI)

...................................................................................10 2.1 Introduction ........................................................................................10 2.2 Vehicle Detectors ...............................................................................10 2.3 Description of the Speed....4 Hourly traffic volumes from the IH-35 test bed in Austin on Oct. 27, 2004 38 Fig 3.5 Layout of the simulated freeway section ...................................................... 41 Fig. 4.1 Average vehicle lengths over time...

Ye, Zhirui

2008-10-10T23:59:59.000Z

220

A New Method of Measuring Sperm Speeds  

Science Journals Connector (OSTI)

... the following footnote occurs on p. 89: "Fiirthmade systematic counts of the number of pedestrians in a [street] block every five seconds.... It is amusing that by ... kind made by Furth it is possible actually to determine the average speed of a pedestrian !" The principle involved in such determinations is known as probability-after-effect, and ...

LORD ROTHSCHILD

1953-03-21T23:59:59.000Z

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


221

THE "LISTENING SPEED" PARADIGM FOR SYNTHESIS EVALUATION  

E-Print Network (OSTI)

THE "LISTENING SPEED" PARADIGM FOR SYNTHESIS EVALUATION Rolf Carlson, Björn Granström, Lennart al. study, the synthesis used was produced by the Votrax synthesizer, a widely used device measures, sentence listening time, word recognition and proposition recognition, correlated with text

Carlson, Rolf

222

Average Rate Speed Scaling Nikhil Bansal1  

E-Print Network (OSTI)

energy. In this setting, the operating system must not only have a job selection policy to determine was deadline feasibility and the objective was to minimize the energy used. More precisely, each job i has of the speed to power function, this even spreading is energy optimal if the instance consists of only one job

Bunde, David

223

Average Rate Speed Scaling Nikhil Bansal  

E-Print Network (OSTI)

energy. In this setting, the operating system must not only have a job selection policy to determine was deadline feasibility and the objective was to minimize the energy used. More precisely, each job i has of the speed to power function, this even spreading is energy optimal if the instance consists of only one job

Bunde, David

224

High speed optical quantum random number generation  

E-Print Network (OSTI)

High speed optical quantum random number generation Martin F¨urst1,2,, Henning Weier1,2, Sebastian, ready-for-use quantum random number generator (QRNG) whose stochastic model is based on the ran- domness directly delivered to a PC, generated at a rate of up to 50 Mbit/s, clearly pass all tests relevant

Weinfurter, Harald

225

Neural Control of the Self-Excited Induction Generator for Variable-Speed Wind Turbine Generation  

Science Journals Connector (OSTI)

In this paper, a steady state and transient analysis of a stand alone Self Excited Induction Generator (SEIG) is presented. The conventional dynamic ... Artificial Neural Network (ANN) to model the induction generator

S. Zouggar; Y. Zidani; M. L. ELhafyani…

2012-01-01T23:59:59.000Z

226

Robust Condition Monitoring and Fault Diagnosis of Variable Speed Induction Motor Drives  

E-Print Network (OSTI)

detection (FD) probability versus SNR. ........................ 33 2.6 Experimental setup: (a) faulty test motors, (b) DC generator, (c) 3-hp induction motor, (d) data acquisition board, (e) torque monitor, (f) oscilloscope, and (g) spectrum analyzer... detection (FD) probability versus SNR. ........................ 33 2.6 Experimental setup: (a) faulty test motors, (b) DC generator, (c) 3-hp induction motor, (d) data acquisition board, (e) torque monitor, (f) oscilloscope, and (g) spectrum analyzer...

Choi, Seungdeog

2012-02-14T23:59:59.000Z

227

A novel high power density permanent magnet variable-speed motor  

SciTech Connect

This paper proposes a novel polyphase multipole permanent magnet motor which possesses high power density, high efficiency and excellent controllability, yet can be produced by conventional fabrication technique. The basic operating principles, design features, performance analysis and control system are described. The experimental results of a 5 kW, 1,500 rpm prototype motor and its comparison with other types of motors such as switched reluctance motor and induction motor are given. This proposed motor has the potential to compete in certain applications.

Chan, C.C.; Chen, G.H.; Jiang, J.Z.; Wang, X.Y. (Univ. of Hong Kong (Hong Kong))

1993-06-01T23:59:59.000Z

228

A study of the effect of variable speed machining on regenerative chatter in end milling  

E-Print Network (OSTI)

production rates. Therefore it is extremely important to avoid and suppress chatter in metal cutting processes. 1. 2. PREVIOUS RESEARCH Chatter has been well investigated by numerous researchers including Tobias (1958), Tlusty (1963), Merritt (1968...), Tlusty (1983), Fu (1984), and others used this method. This uneven insert spacing induces a phase change between subsequent cuts and therefore decreasing the resonance effect that leads to high amplitude chatter. However the major drawback of such a...

Dhayalan, Arun Kumar

2000-01-01T23:59:59.000Z

229

Would you keep speeding through a speed trap if you got a ticket there before?  

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

you keep speeding through a speed trap if you got a ticket there before? you keep speeding through a speed trap if you got a ticket there before? Probably (hopefully) not. Likewise, taking advantage of lessons learned on our capital asset and clean-up projects is not only fiscally prudent, but also just makes good common sense. DOE Order 413.3B "Program and Project Management for the Acquisition of Capital Assets" re- quires formal lessons learned to be documented for a project, as follows:  Within 90 days of CD-3 approval, to cover up-front planning and design lessons learned  Within 90 days of CD-4 approval, to cover project execution and facility start-up les- sons learned These should be formal documents and should be submitted to OECM for sharing throughout the

230

Speed of the Earth : illusion and experience of speed and scale  

E-Print Network (OSTI)

The Speed of the Earth is a proposed sculpture dealing with light as pure experience within the context of short-lived rapid movement and large scale horizontal orientation within the environment. This will be accomplished ...

Benoff, Mitchell

1993-01-01T23:59:59.000Z

231

Covered Product Category: Residential Air-Source Heat Pumps ...  

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

excluded. Specify or select products that are ENERGY STAR-qualified. To find qualified products, go to the Consortium for Energy Efficiency (CEE) and Air Conditioning and...

232

Variable Frequency Drives  

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

How BPA Supports VFDs Rebates are available from your utility for Variable Frequency Drives on pumps 20hp or greater and storage fans.. Energy savings from VFDs vary and can...

233

Is the speed of light invariant or covariant?  

E-Print Network (OSTI)

According to the theory of ether light propagates with constant speed c with respect to the absolute reference frame and with respect to any other reference frame the speed of light is covariant. According to the theory of special relativity the speed of light is invariant with respect to any reference frame. The new theory of reference frames gives a different answer to this question with the consideration of two speeds of light: the physical speed and the relativistic speed. After considering a few negative aspects of the two main theories a few fundamentals of the new theory are expounded.

Daniele Sasso

2010-03-11T23:59:59.000Z

234

LIRR High-Speed Flywheel Demonstration  

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

LIRR High-Speed Flywheel LIRR High-Speed Flywheel Demonstration Guy Sliker Program Manager Research & Technology Development New York Power Authority This project is part of the Joint Energy Storage Initiative between the New York State Energy Research and Development Authority (NYSERDA) and the Energy Storage Systems Program of the U.S. Department of Energy (DOE/ESS), and managed by Sandia National Laboratories (SNL). Presentation Layout Introduction Flywheel Description Project Reasoning Project Objective Project Participants Expected Benefits New York Power Authority Highlights A public benefit energy corporation founded 1931 Largest non-federal public electric utility in United States Wholesale power supplier throughout New York State and neighboring states as required by law

235

Wind Speed Data Analysis using Wavelet Transform  

E-Print Network (OSTI)

Abstract—Renewable energy systems are becoming a topic of great interest and investment in the world. In recent years wind power generation has experienced a very fast development in the whole world. For planning and successful implementations of good wind power plant projects, wind potential measurements are required. In these projects, of great importance is the effective choice of the micro location for wind potential measurements, installation of the measurement station with the appropriate measuring equipment, its maintenance and analysis of the gained data on wind potential characteristics. In this paper, a wavelet transform has been applied to analyze the wind speed data in the context of insight in the characteristics of the wind and the selection of suitable locations that could be the subject of a wind farm construction. This approach shows that it can be a useful tool in investigation of wind potential. Keywords—Wind potential, Wind speed data, Wavelet transform.

S. Avdakovic; A. Lukac; A. Nuhanovic; M. Music

236

Gas Model of Gravitons with Light Speed  

E-Print Network (OSTI)

We first review some aspects of gravitational wave and the thermodynamic expression of Einstein field equations, these achieved conclusions allow people to think of Einstein's gravitational wave as a kind of sound wave in ordinary gas which propagates as an adiabatic compression wave. In the following, using the properties of photon gas in "white wall box", we find an analogous relationship between ordinary gas and photon gas through sound velocity formula. At last, by taking the ordinary gas as an intermediary, we find that gravitational wave is analogous to photon gas, or equally, gravitons are analogous to photons although they are different in some ways such as spins and coupling strengths, and these different properties don't affect their propagation speeds. Utilizing this analogous relationship, we achieve the gas model of gravitons and this model naturally gives out the light speed of gravitons

Ming Chen; Yong-Chang Huang

2014-06-17T23:59:59.000Z

237

Measuring the speed of cosmological gravitational waves  

E-Print Network (OSTI)

We study the effects of a modified speed of gravitational waves (tensor modes), $c_T^2$ on the B-modes of the Cosmic Microwave Background (CMB) anisotropy in polarisation. We find that a departure from the light speed value would leave a characteristic imprint on the BB spectrum part induced by tensors, manifesting as a shift in the angular scale of its peaks. We derive constraints by using the available Planck and BICEP2 datasets showing how $c_T^2$ can be measured, albeit obtaining weak constraints due to the overall poor accuracy of the current BB power spectrum measurements. The present constraint corresponds to $c_T^2 = 1.30 \\pm 0.79$ and $c_T^2measurements, largely due...

Raveri, Marco; Zhou, Shuang-Yong

2014-01-01T23:59:59.000Z

238

Data Capture Technique for High Speed Signaling  

DOE Patents (OSTI)

A data capture technique for high speed signaling to allow for optimal sampling of an asynchronous data stream. This technique allows for extremely high data rates and does not require that a clock be sent with the data as is done in source synchronous systems. The present invention also provides a hardware mechanism for automatically adjusting transmission delays for optimal two-bit simultaneous bi-directional (SiBiDi) signaling.

Barrett, Wayne Melvin (Rochester, MN); Chen, Dong (Croton On Hudson, NY); Coteus, Paul William (Yorktwon Heights, NY); Gara, Alan Gene (Mount Kisco, NY); Jackson, Rory (Eastchester, NY); Kopcsay, Gerard Vincent (Yorktown Hieghts, NY); Nathanson, Ben Jesse (Teaneck, NY); Vranas, Paylos Michael (Bedford Hills, NY); Takken, Todd E. (Brewster, NY)

2008-08-26T23:59:59.000Z

239

Resonant speed meter for gravitational wave detection  

E-Print Network (OSTI)

Gravitational-wave detectors have been well developed and operated with high sensitivity. However, they still suffer from mirror displacement noise. In this paper, we propose a resonant speed meter, as a displacement noise-canceled configuration based on a ring-shaped synchronous recycling interferometer. The remarkable feature of this interferometer is that, at certain frequencies, gravitational-wave signals are amplified, while displacement noises are not.

Atsushi Nishizawa; Seiji Kawamura; Masa-aki Sakagami

2008-05-01T23:59:59.000Z

240

Energy curable compositions having improved cure speeds  

DOE Patents (OSTI)

A composition and method provide improved physical properties and cure speed of polyurethane precursors, with or without free radical polymerizable monomers or oligomers present, by use of a two component catalyst system. The resin blend can be activated with a latent organometallic catalyst combined with an organic peroxide which can be a hydroperoxide or an acyl peroxide to decrease the cure time while increasing the break energy and tangent modulus of the system.

Halm, Leo W. (Blaine, MN)

1993-01-01T23:59:59.000Z

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


241

Quantum superpositions of the speed of light  

E-Print Network (OSTI)

While it has often been proposed that, fundamentally, Lorentz-invariance is not respected in a quantum theory of gravity, it has been difficult to reconcile deviations from Lorentz-invariance with quantum field theory. The most commonly used mechanisms either break Lorentz-invariance explicitly or deform it at high energies. However, the former option is very tightly constrained by experiment already, the latter generically leads to problems with locality. We show here that there exists a third way to integrate deviations from Lorentz-invariance into quantum field theory that circumvents the problems of the other approaches. The way this is achieved is an extension of the standard model in which photons can have different speeds without singling out a preferred restframe, but only as long as they are in a quantum superposition. Once a measurement has been made, observables are subject to the laws of special relativity, and the process of measurement introduces a preferred frame. The speed of light can take on different values, both superluminal and subluminal (with respect to the usual value of the speed of light), without the need for Lorentz-invariance violating operators and without tachyons. We briefly discuss the relation to deformations of special relativity and phenomenological consequences.

Sabine Hossenfelder

2012-07-04T23:59:59.000Z

242

Speed Map for Autonomous Rovers over Rough Terrain  

E-Print Network (OSTI)

presented here: fuzzy logic, reactive control, and machineto speed control is to utilize fuzzy logic. Fuzzy logic wascontrol, this is a new area of research where reactive speed controller, fuzzy logic,

Loh, Jonathan Edau

2012-01-01T23:59:59.000Z

243

Nationwide: Slashing Red Tape To Speed Solar Deployment for Homes...  

Energy Savers (EERE)

Slashing Red Tape To Speed Solar Deployment for Homes and Businesses Nationwide: Slashing Red Tape To Speed Solar Deployment for Homes and Businesses January 24, 2014 - 12:00am...

244

Using video-oriented instructions to speed up sequence comparison  

Science Journals Connector (OSTI)

......research-article ORIGINAL PAPERS Using video-oriented instructions to speed up sequence...and nucleic sequences, using specialized video instructions. These instructions, SIMD-like...Andrzej.Wozniak@inria.fr Using video-oriented instructions to speed up sequence......

A. Wozniak

1997-04-01T23:59:59.000Z

245

New Enzyme Speeds Up Biomass-to-Sugar Conversion | Department...  

Energy Savers (EERE)

New Enzyme Speeds Up Biomass-to-Sugar Conversion New Enzyme Speeds Up Biomass-to-Sugar Conversion January 28, 2015 - 1:32pm Addthis Scientists at the Energy Department's National...

246

Low voltage amplifier architecture for high speed switched capacitor circuits  

E-Print Network (OSTI)

This work concentrates on circuit realization of high speed and low voltage switched capacitor circuits, with emphasis on the operational transconductance amplifier (OTA). An overview of switched capacitor circuits is given. Speed and voltage...

Shankar, Asit

2012-06-07T23:59:59.000Z

247

Improving WRF-ARW Wind Speed Predictions using Genetic Programming  

Science Journals Connector (OSTI)

Numerical weather prediction models can produce wind speed forecasts at a very high space resolution. ... that GP is able to successfully downscale the wind speed predictions, reducing significantly the inherent ...

Giovanna Martinez-Arellano; Lars Nolle…

2012-01-01T23:59:59.000Z

248

Wind-Speed Undulations Over Swell: Field Experiment and Interpretation  

Science Journals Connector (OSTI)

Results of field measurements of the swell-induced undulation of the wind speed taken from a Black Sea platform are presented. The wind speed and its fluctuations were measured at several ... m above the mean sea...

Y. P. Soloviev; V. N. Kudryavtsev

2010-09-01T23:59:59.000Z

249

Solar cycle dependence of global distribution of solar wind speed  

Science Journals Connector (OSTI)

A review is given of observational results concerning the solar cycle dependence of the global structure of solar wind speed distribution during the years from 1973 to 1987. Since observations of solar wind speed

Masayoshi Kojima; Takakiyo Kakinuma

1990-08-01T23:59:59.000Z

250

Photosynthetic Rate of a Plant Community and Wind Speed  

Science Journals Connector (OSTI)

The previous chapter illustrated not only that wind speed affects the photosynthetic rate, but also that ... single leaves, may be affected by the wind speed. Thus, to uncover facts about the...

Kazutoshi Yabuki

2004-01-01T23:59:59.000Z

251

ARE660 Wind Generator: Low Wind Speed Technology for Small Turbine Development  

SciTech Connect

This project is for the design of a wind turbine that can generate most or all of the net energy required for homes and small businesses in moderately windy areas. The purpose is to expand the current market for residential wind generators by providing cost effective power in a lower wind regime than current technology has made available, as well as reduce noise and improve reliability and safety. Robert W. Preus’ experience designing and/or maintaining residential wind generators of many configurations helped identify the need for an improved experience of safety for the consumer. Current small wind products have unreliable or no method of stopping the wind generator in fault or high wind conditions. Consumers and their neighbors do not want to hear their wind generators. In addition, with current technology, only sites with unusually high wind speeds provide payback times that are acceptable for the on-grid user. Abundant Renewable Energy’s (ARE) basic original concept for the ARE660 was a combination of a stall controlled variable speed small wind generator and automatic fail safe furling for shutdown. The stall control for a small wind generator is not novel, but has not been developed for a variable speed application with a permanent magnet alternator (PMA). The fail safe furling approach for shutdown has not been used to our knowledge.

Robert W. Preus; DOE Project Officer - Keith Bennett

2008-04-23T23:59:59.000Z

252

Adult Football Helmet Detailed Ratings Riddell Revolution Speed  

E-Print Network (OSTI)

Adult Football Helmet Detailed Ratings May 2011 Riddell Revolution Speed Helmet ID SPEED1 SPEED2: A total of 10 adult football helmet models were evaluated using the STAR evaluation system for May 2011.397 0.350 0.322 Overall STAR 0.356 Very Good: Adult Football Helmet Detailed Ratings May 2011 #12

Lu, Chang

253

Ris-R-1563(EN) ACCUWIND -Accurate Wind Speed  

E-Print Network (OSTI)

Risø-R-1563(EN) ACCUWIND - Accurate Wind Speed Measurements in Wind Energy Summary Report Troels (RIS�) Title: ACCUWIND ­ Accurate Wind Speed Measurements in Wind Energy ­ Summary Report Department speed measurement in wind energy. It is being applied in high numbers around the world for wind energy

254

Deadline Scheduling and Power Management for Speed Bounded Processors  

E-Print Network (OSTI)

be scaled arbitrarily high (the infinite speed model), SOA can complete all jobs with reduced energy usage,15,23,24] enables a processor to vary the speed dynamically. Running a job slower reduces energy usage, but it takes online job scheduling with speed scaling and energy usage taken into consideration. The challenge arises

Wong, Prudence W.H.

255

DISCRETE QUANTUM MECHANICS AND THE SPEED OF LIGHT JOSEPH TOLES  

E-Print Network (OSTI)

DISCRETE QUANTUM MECHANICS AND THE SPEED OF LIGHT JOSEPH TOLES From S. McAdam, Unknowable Matters that nothing can travel faster than the speed of light. So instead of showing that it's impossible to determine the speed of light. 2. Associated Physics Photons are the smallest single unit of transverse electromagnetic

Morrow, James A.

256

Time, Clocks and the Speed of Light Vasco Guerra  

E-Print Network (OSTI)

Time, Clocks and the Speed of Light Vasco Guerra and Rodrigo de Abreu Departamento de FĂ­sica of the constancy of the two-way speed of light simply results from the construction of clocks where tic-way speed of light is very general and has to be true both within Special Relativity and its "equivalence

Guerra, Vasco

257

Measuring the Speed of Light Lab Manual by  

E-Print Network (OSTI)

Measuring the Speed of Light Lab Manual by: Eric Mueller Dan Passmore #12;Introduction When you to measure the speed of light. Nearly by definition, there is nothing fast enough to trip a clock on light want to measure the speed of something, how do you do it? Generally, you measure off a specific

Dai, Pengcheng

258

High–speed digital optical processing in future networks  

Science Journals Connector (OSTI)

...to be carried out at ultra-high speed in the optical domain, without O...along an optical waveguide at the speed of light. We suggest that the way towards powerful data processing at high speed is to use digital optical processing...

2000-01-01T23:59:59.000Z

259

Scientific Method, Statistical Method, and the Speed of Light.  

E-Print Network (OSTI)

Scientific Method, Statistical Method, and the Speed of Light. R.J. Mackay and R.W. Oldford Working on the speed of light carried out by A.A. Michelson in 1879. Our answer to the second question is negative. To understand this a history on the speed of light up to the time of Michelson's study is presented. The larger

Oldford, R.W.

260

JUPITER AND SPEED OF LIGHT Author: Jaka Klement  

E-Print Network (OSTI)

Seminar JUPITER AND SPEED OF LIGHT Author: Jaka Klement Advisor: prof. dr. Tomaz Zwitter Ljubljana, solving the problem of determining longitude and determining the speed of light. The experiment at the end, a very interesting and nontrivial matter as the speed of light. #12;2 Contents 1. INTRODUCTION (ABOUT

Â?umer, Slobodan

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


261

Light Properties Light travels at the speed of light `c'  

E-Print Network (OSTI)

LIGHT!! #12;Light Properties Light travels at the speed of light `c' C = 3 x 108 m/s Or 190.nasa.gov #12;The speed of light The speed of light `c' is equal to the frequency ` times the wavelength,000 miles/second!! Light could travel around the world about 8 times in one second #12;What is light?? Light

Mojzsis, Stephen J.

262

ccsd00000548 COMMENTS ON "MEASURING THE GRAVITY SPEED BY VLBI"  

E-Print Network (OSTI)

ccsd­00000548 (version 1) : 18 Aug 2003 COMMENTS ON "MEASURING THE GRAVITY SPEED BY VLBI" H. ASADA the light speed. Such a di#11;erence may play a vital role in the primordial universe. In recent, Kopeikin and Fomalont claimed the #12;rst measurement of the gravity speed by VLBI. However, the measurement has

263

Lorentz transformation directly from the invariance of the speed of light via the addition law of parallel speeds  

E-Print Network (OSTI)

We show that starting with the addition law of parallel speeds derived as a consequence of the invariance of the speed of light, the Lorentz transformations for the space-time coordinates can be derived.

Bernhard Rothenstein

2007-09-14T23:59:59.000Z

264

Speed-line for 3D animation  

E-Print Network (OSTI)

Committee Members, Carol LaFayette John Keyser Head of Department, Mardelle Shepley December 2005 Major Subject: Visualization Sciences iii ABSTRACT Speed-Line for 3D Animation. (December 2005) Won Chan Song, B.F.A., Ringling School of Art and Design Chair... to thank my committee members, Prof. Carol LaFayette and Dr. John Keyser for their advice and feedback. My gratitude also goes to Hobart Chan for letting me borrow his car model, which saved me a huge amount of time when I was making an animation as a...

Song, Won Chan

2007-04-25T23:59:59.000Z

265

Effective speed of sound in phononic crystals  

E-Print Network (OSTI)

A new formula for the effective quasistatic speed of sound $c$ in 2D and 3D periodic materials is reported. The approach uses a monodromy-matrix operator to enable direct integration in one of the coordinates and exponentially fast convergence in others. As a result, the solution for $c$ has a more closed form than previous formulas. It significantly improves the efficiency and accuracy of evaluating $c$ for high-contrast composites as demonstrated by a 2D example with extreme behavior.

A. A. Kutsenko; A. L. Shuvalov; A. N. Norris

2011-06-27T23:59:59.000Z

266

The parent wind speed distribution: Why Weibull?  

Science Journals Connector (OSTI)

Abstract Part 1: The Weibull distribution has been used for many years to fit parent wind data. It is a particularly good fit to mean wind speed data arising from a wind climate dominated by temperate depressions. This good fit is practically useful, but intellectually not very satisfactory, because the familiar or Forward Weibull distribution is a purely empirical construct and there have seemed to be no reasons, grounded in either atmospheric physics or probability theory, why wind speeds should conform to this model. This paper introduces another distribution, the Offset Elliptical Normal (OEN) model, which has some justification in terms of probability theory and appears to form a more plausible model for mean wind speeds. It is shown that, over the entire practical range from everyday values to 1:10,000 year extremes and beyond, this new distribution matches a Weibull distribution so closely, that the Weibull can be regarded as not just empirical, but as an effective surrogate for the new distribution. One Weibull distribution corresponds to a whole family of the new distribution. Part 2: The assumptions of Harris’ Offset Elliptical Normal (OEN) model are verified using direct vector analysis of hourly wind observations at two, widely separated UK stations. The Jenkinson–Lamb index is found not to be effective in separating UK wind observations by causal mechanism for individual analysis. Fitting to the marginal distributions of wind speed and direction is shown not to be practicable owing to the information on their joint action that has been lost. Instead, an optimisation methodology is used to fit multiple disjoint OEN models to the joint PDF of the observed wind vectors, without prior separation of the observations. For Marham, Norfolk, a single OEN is sufficient, but two is marginally better. For Tiree, Inner Hebrides, two disjoint \\{OENs\\} are sufficient, but three is marginally better. For Changi, Singapore, three disjoint \\{OENs\\} correspond well with the three seasonal climates (inter-monsoon, “wet” NE monsoon and “dry” SW monsoon). For Rome (Ciampino) the component that dominates in the upper tail is shown to include downbursts from thunderstorms or other strong convective events.

R. Ian Harris; Nicholas J. Cook

2014-01-01T23:59:59.000Z

267

Singularities of varying light speed cosmologies  

E-Print Network (OSTI)

We study the possible singularities of isotropic cosmological models that have a varying speed of light as well as a varying gravitational constant. The field equations typically reduce to two dimensional systems which are then analyzed both by dynamical systems techniques in phase space and by applying the method of asymptotic splittings. In the general case we find initially expanding closed models which recollapse to a future singularity and open universes that are eternally expanding towards the future. The precise nature of the singularities is also discussed.

John Miritzis; Spiros Cotsakis

2006-09-21T23:59:59.000Z

268

A Coral Reefs Optimization algorithm with Harmony Search operators for accurate wind speed prediction  

Science Journals Connector (OSTI)

Abstract This paper introduces a new hybrid bio-inspired solver which combines elements from the recently proposed Coral Reefs Optimization (CRO) algorithm with operators from the Harmony Search (HS) approach, which gives rise to the coined CRO-HS optimization technique. Specifically, this novel bio-inspired optimizer is utilized in the context of short-term wind speed prediction as a means to obtain the best set of meteorological variables to be input to a neural Extreme Learning Machine (ELM) network. The paper elaborates on the main characteristics of the proposed scheme and discusses its performance when predicting the wind speed based on the measures of two meteorological towers located in USA and Spain. The good results obtained in these experiments when compared to naďve versions of the CRO and HS algorithms are promising and pave the way towards the utilization of the derived hybrid solver in other optimization problems arising from diverse disciplines.

S. Salcedo-Sanz; A. Pastor-Sánchez; J. Del Ser; L. Prieto; Z.W. Geem

2015-01-01T23:59:59.000Z

269

Oklo and the Speed of Light at SLAC’s Next Colloquium!  

SciTech Connect

Natural nuclear reactors? Changes in the speed of light? If either of these concepts seem implausible to you now they certainly won’t once Dr. Steve Lamoreaux (LANL) delivers his SLAC Colloquium lecture in the Panofsky Auditorium on November 7th at 4:15 pm entitled The Oklo Natural Reactor and the Time Variability of the Fundamental Constants of Nature. This lecture is a rare opportunity to learn not only about Oklo’s incredible natural nuclear reactors but also to gain understanding about how the present-day study of these sites may alter our understanding of fundamental constants such as the speed of light. This event is a must-see for the curious!

Dr. Steve Lamoreaux

2005-11-07T23:59:59.000Z

270

Sustainably Priced Energy Enterprise Development (SPEED) Goals | Department  

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

Sustainably Priced Energy Enterprise Development (SPEED) Goals Sustainably Priced Energy Enterprise Development (SPEED) Goals Sustainably Priced Energy Enterprise Development (SPEED) Goals < Back Eligibility Investor-Owned Utility Municipal Utility Rural Electric Cooperative Savings Category Bioenergy Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Solar Heating & Cooling Water Heating Wind Program Info State Vermont Program Type Renewables Portfolio Standard Provider Vermont Public Service Board Vermont's Sustainably Priced Energy Enterprise Development (SPEED) Program was created by legislation in 2005 to promote renewable energy development. The SPEED program itself is not a renewable portfolio goal or standard. However, if the Vermont Public Service Board (PSB) determines that the

271

Alternative Fuels Data Center: Medium-Speed and Neighborhood Electric  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Medium-Speed and Medium-Speed and Neighborhood Electric Vehicle (NEV) Definition and Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Medium-Speed and Neighborhood Electric Vehicle (NEV) Definition and Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Medium-Speed and Neighborhood Electric Vehicle (NEV) Definition and Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Medium-Speed and Neighborhood Electric Vehicle (NEV) Definition and Access to Roadways on Google Bookmark Alternative Fuels Data Center: Medium-Speed and Neighborhood Electric Vehicle (NEV) Definition and Access to Roadways on Delicious Rank Alternative Fuels Data Center: Medium-Speed and Neighborhood Electric Vehicle (NEV) Definition and Access to Roadways on Digg

272

Vehicle Technologies Office: Fact #410: February 6, 2006 Maximum Speed  

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

0: February 6, 0: February 6, 2006 Maximum Speed Limits by State, 2005 to someone by E-mail Share Vehicle Technologies Office: Fact #410: February 6, 2006 Maximum Speed Limits by State, 2005 on Facebook Tweet about Vehicle Technologies Office: Fact #410: February 6, 2006 Maximum Speed Limits by State, 2005 on Twitter Bookmark Vehicle Technologies Office: Fact #410: February 6, 2006 Maximum Speed Limits by State, 2005 on Google Bookmark Vehicle Technologies Office: Fact #410: February 6, 2006 Maximum Speed Limits by State, 2005 on Delicious Rank Vehicle Technologies Office: Fact #410: February 6, 2006 Maximum Speed Limits by State, 2005 on Digg Find More places to share Vehicle Technologies Office: Fact #410: February 6, 2006 Maximum Speed Limits by State, 2005 on AddThis.com...

273

The dynamics of variable-density turbulence  

SciTech Connect

The dynamics of variable-density turbulent fluids are studied by direct numerical simulation. The flow is incompressible so that acoustic waves are decoupled from the problem, and implying that density is not a thermodynamic variable. Changes in density occur due to molecular mixing. The velocity field is, in general, divergent. A pseudo-spectral numerical technique is used to solve the equations of motion. Three-dimensional simulations are performed using a grid size of 128{sup 3} grid points. Two types of problems are studied: (1) the decay of isotropic, variable-density turbulence, and (2) buoyancy-generated turbulence in a fluid with large density fluctuations (such that the Boussinesq approximation is not valid). In the case of isotropic, variable-density turbulence, the overall statistical decay behavior, for the cases studied, is relatively unaffected by the presence of density variations when the initial density and velocity fields are statistically independent. The results for this case are in quantitative agreement with previous numerical and laboratory results. In this case, the initial density field has a bimodal probability density function (pdf) which evolves in time towards a Gaussian distribution. The pdf of the density field is symmetric about its mean value throughout its evolution. If the initial velocity and density fields are statistically dependent, however, the decay process is significantly affected by the density fluctuations. For this case, the pdf of the density becomes asymmetric about its mean value during the early stages of its evolution. It is argued that these asymmetries in the pdf of the density field are due to different entrainment rates, into the mixing region, that favor the high speed fluid.

Sandoval, D.L.

1995-11-01T23:59:59.000Z

274

Solar wind suprathermal electron Stahl widths across high-speed stream structures  

SciTech Connect

Suprathermal electrons (100-1500 eV) observed in the solar wind typically show a strahl distribution, that is, a beam directed away from the Sun along the magnetic field direction. The strahl width observed at 1 AU is highly variable, ranging from 10-70 degrees. The obsenred finite width of the strahl results from the competition between beam focusing as the interplanetary magnetic field strength drops with distance from the Sun, and pitch-angle scattering as the beam interacts with the solar wind plasma in transit from the sun. Here we examine strahl width, observed with ACE SWEPAM across high-speed stream structures to investigate variations in electron scattering as a function of local plasma characteristics. We find that narrow strahls (less than 20 degrees wide), indicating reduced scattering, are observed within high-speed streams. Narrow strahls are also observed in both very low temperature solar wind, in association with ICMEs. Case studies of high-speed streams typically show the strahl narrowing at the leading edge of the stream. In some cases, the strahl narrows at the reverse shock or pressure wave, in other cases at the stream interface. The narrowing can either occur discontinuously or gradually over a period of hours. Within the high-speed wind, the strahl remains narrow for a period of hours to days, and then gradually broadens. The strahl width is roughly constant at all energies across these structures. For some fraction of high-speed streams, counterstreaming is associated with passage of the corotating interaction region. In these cases, we find the widths of the two counterstreaming beams frequently differ by more than 40 degrees. This dramatic difference in strahl width contrasts with observations in the solar wind as a whole, in which counterstreaming strahls typically differ in width by less than 20 degrees.

Skoug, Ruth M [Los Alamos National Laboratory; Steinberg, John T [Los Alamos National Laboratory; Goodrich, Katherine A [Los Alamos National Laboratory; Anderson, Brett R [DARTMUTH UNIV.

2011-01-03T23:59:59.000Z

275

Variable depth core sampler  

DOE Patents (OSTI)

A variable depth core sampler apparatus comprising a first circular hole saw member, having longitudinal sections that collapses to form a point and capture a sample, and a second circular hole saw member residing inside said first hole saw member to support the longitudinal sections of said first hole saw member and prevent them from collapsing to form a point. The second hole saw member may be raised and lowered inside said first hole saw member.

Bourgeois, Peter M. (Hamburg, NY); Reger, Robert J. (Grand Island, NY)

1996-01-01T23:59:59.000Z

276

Variable laser attenuator  

DOE Patents (OSTI)

The disclosure relates to low loss, high power variable attenuators comprising one or more transmissive and/or reflective multilayer dielectric filters. The attenuator is particularly suitable to use with unpolarized lasers such as excimer lasers. Beam attenuation is a function of beam polarization and the angle of incidence between the beam and the filter and is controlled by adjusting the angle of incidence the beam makes to the filter or filters. Filters are selected in accordance with beam wavelength. 9 figs.

Foltyn, S.R.

1987-05-29T23:59:59.000Z

277

Variable depth core sampler  

DOE Patents (OSTI)

A variable depth core sampler apparatus is described comprising a first circular hole saw member, having longitudinal sections that collapses to form a point and capture a sample, and a second circular hole saw member residing inside said first hole saw member to support the longitudinal sections of said first hole saw member and prevent them from collapsing to form a point. The second hole saw member may be raised and lowered inside said first hole saw member. 7 figs.

Bourgeois, P.M.; Reger, R.J.

1996-02-20T23:59:59.000Z

278

Jefferson Lab Science Series - The Ultimate Speed  

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

Higgs Boson and Our Life Higgs Boson and Our Life Previous Video (The Higgs Boson and Our Life) Science Series Video Archive Next Video (What Is CEBAF All About?) What Is CEBAF All About? The Ultimate Speed Dr. William Bertozzi - Massachusetts Institute of Technology Sometime in 1962 In his youth, Dr. William Bertozzi, an MIT professor who has long been a leader in experimental nuclear physics using beams of electrons, carried out an experiment in which he explored the relationship between the velocity of electrons and their kinetic energy by measurements over a range of accelerating voltages between 0.5 MeV and 15 MeV. The kinetic energy is measured using calorimetry and the velocity is measured by time-of-flight. This educational film, made in 1962, documents the experiment and shows

279

High Speed AB-Solar Sail  

E-Print Network (OSTI)

The Solar sail is a large thin film used to collect solar light pressure for moving of space apparatus. Unfortunately, the solar radiation pressure is very small about 9 mkN/sq.m at Earth's orbit. However, the light force significantly increases up to 0.2 - 0.35 N/sq.m near the Sun. The author offers his research on a new revolutionary highly reflective solar sail which flyby (after special maneuver) near Sun and attains velocity up to 400 km/sec and reaching far planets of the Solar system in short time or enable flights out of Solar system. New, highly reflective sail-mirror allows avoiding the strong heating of the solar sail. It may be useful for probes close to the Sun and Mercury and Venus. Key words: AB-solar sail, highly reflective solar sail, high speed propulsion.

Bolonkin, A

2007-01-01T23:59:59.000Z

280

Research towards high speed extrusion freeforming  

Science Journals Connector (OSTI)

Additive Manufacturing (AM) methods are currently utilised for the manufacture of prototypes and low volume, high cost parts. This is because in most cases the high material costs and low volumetric deposition rates of AM parts result in higher per part cost than traditional manufacturing methods. This paper brings together recent research aimed at improving the economics of AM, in particular Extrusion Freeforming (EF). A new class of machine is described called High Speed Additive Manufacturing (HSAM) in which software, hardware and materials advances are aggregated. HSAM could be cost competitive with injection moulding for medium sized medium quantity parts. A general outline for a HSAM machine and supply chain is provided along with future required research.

Hadley Brooks; Mihaela E. Lupeanu; Barry Piorkowski

2013-01-01T23:59:59.000Z

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


281

High Speed AB-Solar Sail  

E-Print Network (OSTI)

The Solar sail is a large thin film used to collect solar light pressure for moving of space apparatus. Unfortunately, the solar radiation pressure is very small about 9 mkN/sq.m at Earth's orbit. However, the light force significantly increases up to 0.2 - 0.35 N/sq.m near the Sun. The author offers his research on a new revolutionary highly reflective solar sail which flyby (after special maneuver) near Sun and attains velocity up to 400 km/sec and reaching far planets of the Solar system in short time or enable flights out of Solar system. New, highly reflective sail-mirror allows avoiding the strong heating of the solar sail. It may be useful for probes close to the Sun and Mercury and Venus. Key words: AB-solar sail, highly reflective solar sail, high speed propulsion.

A. Bolonkin

2007-01-08T23:59:59.000Z

282

Energy management options for high speed trains  

SciTech Connect

The efficient operation of trains which undergo large changes in energy as they fulfill their operational function requires recapture of the kinetic energy of a high speed train or the potential energy of a train in mountainous terrain. This paper is a description of the various storage options available in the railroad environment and their relative merits. The economic, environmental, and safety issues are discussed. The options discussed include: the physical means of storing energy, the location on board the train or on fixed ground, and the relation of energy storage to the nature of the engine used as a prime mover. It is argued that, in the absence of a fully electric, power supply connected to a utility grid, the gas turbine engine is the best propulsion system to meet the propulsion needs of trains requiring high power and efficiency because its high power to weight ratio enables the use of energy storage.

Decher, R. [Univ. of Washington, Seattle, WA (United States). Dept. of Aeronautics and Astronautics

1995-12-31T23:59:59.000Z

283

Speed of Light in Gravitational Fields  

E-Print Network (OSTI)

A spherically symmetric and static metric that describes physical coordinates is introduced. It is defined to be a metric that gives coordinate independent results for physically observable quantities without a further coordinate transformation. The suggested metric also makes a prediction for the second order gravitational red shift effect that can be utilized for a precision experimental test in the future. A possible new experimental test would be provided by a modern Michelson Morley experiment on the earth with the two arms in vertical and horizontal directions to see the validity of isotropy or anisotropy for the speed of light. The possibility of using pulsars and GPS (Global Positioning System) for a general relativity test is discussed.

Yukio Tomozawa

2003-03-03T23:59:59.000Z

284

High Speed/ Low Effluent Process for Ethanol  

SciTech Connect

n this project, BPI demonstrated a new ethanol fermentation technology, termed the High Speed/ Low Effluent (HS/LE) process on both lab and large pilot scale as it would apply to wet mill and/or dry mill corn ethanol production. The HS/LE process allows very rapid fermentations, with 18 to 22% sugar syrups converted to 9 to 11% ethanol ‘beers’ in 6 to 12 hours using either a ‘consecutive batch’ or ‘continuous cascade’ implementation. This represents a 5 to 8X increase in fermentation speeds over conventional 72 hour batch fermentations which are the norm in the fuel ethanol industry today. The ‘consecutive batch’ technology was demonstrated on a large pilot scale (4,800 L) in a dry mill corn ethanol plant near Cedar Rapids, IA (Xethanol Biofuels). The pilot demonstrated that 12 hour fermentations can be accomplished on an industrial scale in a non-sterile industrial environment. Other objectives met in this project included development of a Low Energy (LE) Distillation process which reduces the energy requirements for distillation from about 14,000 BTU/gal steam ($0.126/gal with natural gas @ $9.00 MCF) to as low as 0.40 KW/gal electrical requirements ($0.022/gal with electricity @ $0.055/KWH). BPI also worked on the development of processes that would allow application of the HS/LE fermentation process to dry mill ethanol plants. A High-Value Corn ethanol plant concept was developed to produce 1) corn germ/oil, 2) corn bran, 3) ethanol, 4) zein protein, and 5) nutritional protein, giving multiple higher value products from the incoming corn stream.

M. Clark Dale

2006-10-30T23:59:59.000Z

285

Photodetector having high speed and sensitivity  

DOE Patents (OSTI)

The present invention provides a photodetector having an advantageous combination of sensitivity and speed; it has a high sensitivity while retaining high speed. In a preferred embodiment, visible light is detected, but in some embodiments, x-rays can be detected, and in other embodiments infrared can be detected. The present invention comprises a photodetector having an active layer, and a recombination layer. The active layer has a surface exposed to light to be detected, and comprises a semiconductor, having a bandgap graded so that carriers formed due to interaction of the active layer with the incident radiation tend to be swept away from the exposed surface. The graded semiconductor material in the active layer preferably comprises Al.sub.1-x Ga.sub.x As. An additional sub-layer of graded In.sub.1-y Ga.sub.y As may be included between the Al.sub.1-x Ga.sub.x As layer and the recombination layer. The recombination layer comprises a semiconductor material having a short recombination time such as a defective GaAs layer grown in a low temperature process. The recombination layer is positioned adjacent to the active layer so that carriers from the active layer tend to be swept into the recombination layer. In an embodiment, the photodetector may comprise one or more additional layers stacked below the active and recombination layers. These additional layers may include another active layer and another recombination layer to absorb radiation not absorbed while passing through the first layers. A photodetector having a stacked configuration may have enhanced sensitivity and responsiveness at selected wavelengths such as infrared.

Morse, Jeffrey D. (Martinez, CA); Mariella, Jr., Raymond P. (Danville, CA)

1991-01-01T23:59:59.000Z

286

Feature selection in wind speed prediction systems based on a hybrid coral reefs optimization – Extreme learning machine approach  

Science Journals Connector (OSTI)

Abstract This paper presents a novel approach for short-term wind speed prediction based on a Coral Reefs Optimization algorithm (CRO) and an Extreme Learning Machine (ELM), using meteorological predictive variables from a physical model (the Weather Research and Forecast model, WRF). The approach is based on a Feature Selection Problem (FSP) carried out with the CRO, that must obtain a reduced number of predictive variables out of the total available from the WRF. This set of features will be the input of an ELM, that finally provides the wind speed prediction. The CRO is a novel bio-inspired approach, based on the simulation of reef formation and coral reproduction, able to obtain excellent results in optimization problems. On the other hand, the ELM is a new paradigm in neural networks’ training, that provides a robust and extremely fast training of the network. Together, these algorithms are able to successfully solve this problem of feature selection in short-term wind speed prediction. Experiments in a real wind farm in the USA show the excellent performance of the CRO–ELM approach in this FSP wind speed prediction problem.

S. Salcedo-Sanz; A. Pastor-Sánchez; L. Prieto; A. Blanco-Aguilera; R. García-Herrera

2014-01-01T23:59:59.000Z

287

Speed of light in the extended gravity theories  

E-Print Network (OSTI)

We shall investigate the possibility of formulation of varying speed of light (VSL) in the framework of Palatini non-linear Ricci scalar and Ricci squared theories. Different speeds of light including the causal structure constant, electromagnetic, and gravitational wave speeds are discussed. We shall see that two local frames are distinguishable and discuss about the velocity of light in these two frames. We shall investigate which one of these local frames is inertial.

Azam Izadi; Ali Shojai

2009-09-02T23:59:59.000Z

288

The speed of light under the IST and Lorentz Transformations  

E-Print Network (OSTI)

We expand the IST transformation to three-dimensional Euclidean space and derive the speed of light under the IST transformation. The switch from the direction cosines observed in K to those observed in K-prime is surprisingly smooth. The formulation thus derived maintains the property that the round trip speed is constant. We further show that under the proper synchronization convention of K-prime, the one-way speed of light becomes constant.

Chandru Iyer

2008-10-09T23:59:59.000Z

289

Boosting the Next Wave of Accelerators: New Technique Speeds...  

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

Boosting Accelerator Design Boosting the Next Wave of Accelerators New Technique Speeds Simulations by up to a Million-fold March 29, 2011 | Tags: Franklin, Nuclear Physics (NP)...

290

Surface wind speed distributions| Implications for climate and wind power.  

E-Print Network (OSTI)

?? Surface constituent and energy fluxes, and wind power depend non-linearly on wind speed and are sensitive to the tails of the wind distribution. Until… (more)

Capps, Scott Blair

2010-01-01T23:59:59.000Z

291

Microorganisms to Speed Production of Biofuels - Energy Innovation...  

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

Microorganisms to Speed Production of Biofuels Oak Ridge National Laboratory Contact ORNL About This Technology Technology Marketing SummaryResearchers at ORNL developed...

292

New process speeds conversion of biomass to fuels  

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

Conversion of Biomass to Fuels New process speeds conversion of biomass to fuels Scientists made a major step forward recently towards transforming biomass-derived molecules into...

293

New process speeds conversion of biomass to fuels  

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

Conversion of biomass to fuels New process speeds conversion of biomass to fuels Scientists made a major step forward recently towards transforming biomass-derived molecules into...

294

PERFORMANCE MODELLING; BUNKER CONSUMPTION AS FUNCTION OF VESSEL SPEED.  

E-Print Network (OSTI)

?? An investigation of the bunker consumption as function of speed is made, which tries to identify the behaviour of the relationship. A lot of… (more)

Karlsson, John

2012-01-01T23:59:59.000Z

295

Probing Fukushima with cosmic rays should help speed cleanup...  

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

Probing Fukushima with cosmic rays Probing Fukushima with cosmic rays should help speed cleanup of damaged plant The initiative could reduce the time required to clean up the...

296

Sizing High Speed Micro Generators for Smart Grid Systems  

Science Journals Connector (OSTI)

This chapter presents a step by step sizing procedure of High Speed Permanent Magnet Synchronous Generators (HSPMSGs) for smart grid applications to be driven by micro-turbines....

Adel El Shahat; Ali Keyhani

2012-01-01T23:59:59.000Z

297

Commerce Department to Speed Review of Green Technology Patents...  

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

is designed to speed the development and deployment of green technology, create green jobs, and promote U.S. competitiveness. In particular, the program focuses on...

298

Artificial molecules that switch "handedness" at light-speed  

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

molecules that switch "handedness" Artificial molecules that switch "handedness" at light-speed Researchers create the first artificial molecules whose chirality can be...

299

D(p)-Branes Moving at the Speed of Light  

E-Print Network (OSTI)

We construct new bosonic boundary states in the light-cone gauge which describe D(p)-branes moving at the speed of light.

B. Jensen

1998-04-29T23:59:59.000Z

300

'Slow light' advance could speed optical computing, telecommunications  

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

"Slow light" and specialized metamaterials 'Slow light' advance could speed optical computing, telecommunications Researchers have made the first demonstration of rapidly switching...

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


301

Reversed Gravitational Acceleration for High-speed Particles  

E-Print Network (OSTI)

Examination of the free-fall motion of particles of extremely high-speed in the Schwarzschild geometry reveals that the gravitational acceleration of such particles is reversed when measured in Schwarzschild coordinates. High-speed particles decelerate when moving radially downward, and they accelerate when moving upward. The onset of this abnormal behavior occurs at a speed of 1/Sqrt(3) times the local value of the speed of light. However, the gravitational force always remains attractive. PACS numbers: 04.20.-q, 04.20.Cv, 01.65+g

Hans C. Ohanian

2011-02-14T23:59:59.000Z

302

1994 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS--I: REGULAR PAPERS, VOL. 56, NO. 9, SEPTEMBER 2009 Processor Speed Control With Thermal Constraints  

E-Print Network (OSTI)

variables such as power supply voltage) can be controlled, and we model the dissipated power of a processor control laws, which adjust the processor speeds based on the measured temperatures in the system. We give, distributed control, primal-dual interior-point methods, temperature-aware processor control. I. INTRODUCTION

De Micheli, Giovanni

303

PHP: Constructs and Variables Introduction  

E-Print Network (OSTI)

PHP: Constructs and Variables Introduction This document describes: 1. the syntax and types of variables, 2. PHP control structures (i.e., conditionals and loops), 3. mixed-mode processing, 4. how to use one script from within another, 5. how to define and use functions, 6. global variables in PHP, 7

Vander Zanden, Brad

304

High speed exhaust gas recirculation valve  

DOE Patents (OSTI)

In order to minimize pollutants such as Nox, internal combustion engines typically include an exhaust gas recirculation (EGR) valve that can be used to redirect a portion of exhaust gases to an intake conduit, such as an intake manifold, so that the redirected exhaust gases will be recycled. It is desirable to have an EGR valve with fast-acting capabilities, and it is also desirable to have the EGR valve take up as little space as possible. An exhaust gas recirculation valve is provided that includes an exhaust passage tube, a valve element pivotally mounted within the exhaust passage tube, a linear actuator; and a gear train. The gear train includes a rack gear operatively connected to the linear actuator, and at least one rotatable gear meshing with the rack gear and operatively connected to the valve element to cause rotation of the valve element upon actuation of the linear actuator. The apparatus provides a highly compact package having a high-speed valve actuation capability.

Fensom, Rod (Peterborough, GB); Kidder, David J. (Peterborough, GB)

2005-01-18T23:59:59.000Z

305

High speed point derivative microseismic detector  

DOE Patents (OSTI)

A high speed microseismic event detector constructed in accordance with the present invention uses a point derivative comb to quickly and accurately detect microseismic events. Compressional and shear waves impinging upon microseismic receiver stations disposed to collect waves are converted into digital data and analyzed using a point derivative comb including assurance of quiet periods prior to declaration of microseismic events. If a sufficient number of quiet periods have passed, the square of a two point derivative of the incoming digital signal is compared to a trip level threshold exceeding the determined noise level to declare a valid trial event. The squaring of the derivative emphasizes the differences between noise and signal, and the valid event is preferably declared when the trip threshold has been exceeded over a temporal comb width to realize a comb over a given time period. Once a trial event has been declared, the event is verified through a spatial comb, which applies the temporal event comb to additional stations. The detector according to the present invention quickly and accurately detects initial compressional waves indicative of a microseismic event which typically exceed the ambient cultural noise level by a small amount, and distinguishes the waves from subsequent larger amplitude shear waves. 9 figs.

Uhl, J.E.; Warpinski, N.R.; Whetten, E.B.

1998-06-30T23:59:59.000Z

306

High speed point derivative microseismic detector  

DOE Patents (OSTI)

A high speed microseismic event detector constructed in accordance with the present invention uses a point derivative comb to quickly and accurately detect microseismic events. Compressional and shear waves impinging upon microseismic receiver stations disposed to collect waves are converted into digital data and analyzed using a point derivative comb including assurance of quiet periods prior to declaration of microseismic events. If a sufficient number of quiet periods have passed, the square of a two point derivative of the incoming digital signal is compared to a trip level threshold exceeding the determined noise level to declare a valid trial event. The squaring of the derivative emphasizes the differences between noise and signal, and the valid event is preferably declared when the trip threshold has been exceeded over a temporal comb width to realize a comb over a given time period. Once a trial event has been declared, the event is verified through a spatial comb, which applies the temporal event comb to additional stations. The detector according to the present invention quickly and accurately detects initial compressional waves indicative of a microseismic event which typically exceed the ambient cultural noise level by a small amount, and distinguishes the waves from subsequent larger amplitude shear waves.

Uhl, James Eugene (Albuquerque, NM); Warpinski, Norman Raymond (Albuquerque, NM); Whetten, Ernest Blayne (Albuquerque, NM)

1998-01-01T23:59:59.000Z

307

High-speed pumping to UHV  

Science Journals Connector (OSTI)

Development of a high-speed pumping system for ultra high vacuum (UHV) process dose not reduce only cost and waiting time for experiment and production, but also reduces CO2 emission that is known as one of the serious causes in the global warming problem. Reduction of vapor water concentration in a purge gas line would be one of the most effective measures to reduce pumping time to UHV. We carried out control of water vapor in a nitrogen gas purge line in addition to surface treatments of chambers using buff polishing and electrolytic polishing, followed by measurement of outgassing rate of the chambers. Under the reasonable control of the water vapor, the pumping time to reach the pressure of 1 × 10?6 Pa was able to be shortened with two orders of the magnitude. And it was also found that the main residual gas in the chamber was hydrogen after pumping down with the low concentration of water vapor. The quality of residual gas was equivalent to the quality in a baked UHV system. The introduction of well controlled nitrogen gas to the vacuum system which was not baked out during its pumping has proved a pressure of 3 × 10?8 Pa for 24 h in the chamber without orifice.

Ko Yamazaki; Junichi Shike; Motoi Yamagata; Masahiro Kitano; Michiru Nishiwaki; Shigeki Kato

2009-01-01T23:59:59.000Z

308

13 - Burmeister & Wain low speed engines  

Science Journals Connector (OSTI)

Publisher Summary Burmeister & Wain (B&W) is the pioneering Danish designer and builder of low speed two-stroke crosshead engines. The company's focus in the post-War era was to develop high pressure turbocharged single-acting uniflow-scavenged models with one centrally located exhaust valve. The uniflow system fosters effective scavenging of the exhaust gases from the cylinder in an even progressive upwards movement with low flow resistance through to the exhaust manifold via a large diameter poppet-type exhaust valve. B&W introduced a number of engine series—successively the K-GF, L-GF, L-GFCA, and L-GB program—before launching the MC design portfolio that are now developed and marketed under the MAN B&W Diesel banner. B&W two-stroke engines based on the K-GF series featured many new design features. Notable were the box-type construction of the crankcase and the use of a hydraulically actuated exhaust valve instead of the conventional mechanical rocker arm system used in the earlier K-EF types. The company further improved the fuel consumption by launching the L-GB and L-GBE series engines that use the optimum combination of longer stroke, higher output and higher maximum pressure, and the newest high efficiency turbochargers to offer much lower fuel consumption rates.

2004-01-01T23:59:59.000Z

309

Speed of light on rotating platforms  

E-Print Network (OSTI)

It is often taken for granted that on board a rotating disk it is possible to operate a \\QTR{it}{global}3+1 splitting of space-time, such that both lengths and time intervals are \\QTR{it}{uniquely} defined in terms of measurements performed by real rods and real clocks at rest on the platform. This paper shows that this assumption, although widespread and apparently trivial, leads to an anisotropy of the velocity of two light beams travelling in opposite directions along the rim of the disk; which in turn implies some recently pointed out paradoxical consequences undermining the self-consistency of the Special Theory of Relativity (SRT). A correct application of the SRT solves the problem and recovers complete internal consistency for the theory. As an immediate consequence, it is shown that the Sagnac effect only depends on the non homogeneity of time on the platform and has nothing to do with any anisotropy of the speed of light along the rim of the disk, contrary to an incorrect but widely supported idea.

G. Rizzi; A. Tartaglia

1998-05-25T23:59:59.000Z

310

Comparative Analysis between Grundfos CRE 15-3 Variable Speed Centrifugal Pumps and a Worthington D-824 Constant Speed Centrifugal Pump in a KU Steam Power Plant Application  

E-Print Network (OSTI)

power plant located at The University of Kansas, these two pumps must supply water to a deaerator tank and to a heat exchanger, where the deaerator tank is the tank that provides water to the boilers inside the power plant. The heat exchanger is only...

Schmidt, Fabian Philip

2014-05-31T23:59:59.000Z

311

Sub-daily Statistical Downscaling of Meteorological Variables Using Neural Networks  

SciTech Connect

A new open source neural network temporal downscaling model is described and tested using CRU-NCEP reanal ysis and CCSM3 climate model output. We downscaled multiple meteorological variables in tandem from monthly to sub-daily time steps while also retaining consistent correlations between variables. We found that our feed forward, error backpropagation approach produced synthetic 6 hourly meteorology with biases no greater than 0.6% across all variables and variance that was accurate within 1% for all variables except atmospheric pressure, wind speed, and precipitation. Correlations between downscaled output and the expected (original) monthly means exceeded 0.99 for all variables, which indicates that this approach would work well for generating atmospheric forcing data consistent with mass and energy conserved GCM output. Our neural network approach performed well for variables that had correlations to other variables of about 0.3 and better and its skill was increased by downscaling multiple correlated variables together. Poor replication of precipitation intensity however required further post-processing in order to obtain the expected probability distribution. The concurrence of precipitation events with expected changes in sub ordinate variables (e.g., less incident shortwave radiation during precipitation events) were nearly as consistent in the downscaled data as in the training data with probabilities that differed by no more than 6%. Our downscaling approach requires training data at the target time step and relies on a weak assumption that climate variability in the extrapolated data is similar to variability in the training data.

Kumar, Jitendra [ORNL] [ORNL; Brooks, Bjřrn-Gustaf J. [University of Illinois, Urbana-Champaign] [University of Illinois, Urbana-Champaign; Thornton, Peter E [ORNL] [ORNL; Dietze, Michael [University of Illinois, Urbana-Champaign] [University of Illinois, Urbana-Champaign

2012-01-01T23:59:59.000Z

312

SUPER HIGH-SPEED MINIATURIZED PERMANENT MAGNET SYNCHRONOUS MOTOR  

E-Print Network (OSTI)

SUPER HIGH-SPEED MINIATURIZED PERMANENT MAGNET SYNCHRONOUS MOTOR by LIPING ZHENG B.S. Shanghai with the design of permanent magnet synchronous motors (PMSM) to operate at super-high speed with high efficiency shaft output power at 200,000 rpm and at the cryogenic temperature of 77 K. The test results showed

Wu, Thomas

313

An evaluation of inductance loop detectors for speed measurement accuracy  

E-Print Network (OSTI)

. The lag time from the presence of a vehicle at an inductance loop to the actual detection of a vehicle varies. As the lag time varies so does the accuracy of speed measurement. Vehicle size, vehicle speed, detector type, detector sensitivity...

Cronin, Brian Patrick

2012-06-07T23:59:59.000Z

314

0 Riso-R-434 Wind Speed and Direction  

E-Print Network (OSTI)

meteorological statistics for the area as it was considered a possible site for a nuclear power plant. \\ \\ Duringm I 0 Riso-R-434 t Wind Speed and Direction Changes due to Terrain Effects revealed-4000 Roskilde, Denmark May 1983 #12;RISĂ?-R-434 WIND SPEED AND DIRECTION CHANGES DUE TO TERRAIN EFFECTS

315

Estimation of Wind Speed in Connection to a Wind Turbine  

E-Print Network (OSTI)

horizontal axis wind power plant with rated power 750 KW. The plant has a three bladed rotor and an automatic is shown in Figure 1 demand Drive train Generator Rotor Wind speed Power demand Grid Power Controller PitchEstimation of Wind Speed in Connection to a Wind Turbine X. Ma #3; , N. K. Poulsen #3; , H. Bindner

316

High Speed Rail in America Thomas Ducharme, Matt Schena,  

E-Print Network (OSTI)

International Airport. · Florida is on track to open one of America's first HSR express service between Tampa Situation of High Speed Rail · The US only has one high speed rail o Acela Which runs from Boston Airport congestion o By eliminating 900,000 city to city flights · Give access to cheaper long distance

Nagurney, Anna

317

Ocean Wind Speed Climatology from Spaceborne SAR Imagery  

Science Journals Connector (OSTI)

Spaceborne synthetic aperture radar (SAR) imagery can make high-resolution (?500 m) ocean wind speed measurements. The authors anticipate reprocessing the full decade and a half of Radarsat-1 SAR imagery and generating a SAR wind speed archive. These data ...

Frank M. Monaldo; Xiaofeng Li; William G. Pichel; Christopher R. Jackson

2014-04-01T23:59:59.000Z

318

Dual, High Speed ECL Comparators ADCMP563/ADCMP564  

E-Print Network (OSTI)

time bandwidth Typical output rise/fall time of 500 ps ESD protection > 4kV HBM, >200V MM Programmable drive transmission lines terminated in 50 to -2 V. A latch input, which is included, permits tracking ends Window comparators High speed line receivers Threshold detection Peak detection High speed

Berns, Hans-Gerd

319

High-speed camera characterization of voluntary eye blinking kinematics  

Science Journals Connector (OSTI)

...continuous exposure of light, and (iii) relieves...loud sound or strong light. In this study, we consider...amplitude, duration and peak speed vary significantly between...chair before a high-speed camera, one person at...humidity with natural light. For each volunteer...

2013-01-01T23:59:59.000Z

320

High speed flow cytometric separation of viable cells  

DOE Patents (OSTI)

Hematopoietic cell populations are separated to provide cell sets and subsets as viable cells with high purity and high yields, based on the number of original cells present in the mixture. High-speed flow cytometry is employed using light characteristics of the cells to separate the cells, where high flow speeds are used to reduce the sorting time.

Sasaki, D.T.; Van den Engh, G.J.; Buckie, A.M.

1995-11-14T23:59:59.000Z

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


321

A comment on the Invariance of the Speed of Light  

E-Print Network (OSTI)

The invariance of the speed of light in all inertial frames is shown to be an inevitable consequence of the relativity principle of special relativity contrary to the view held by Hsu and Hsu in taiji relativity where the speed of light is no longer a universal constant. The present approach is not only new but also much simpler than the existing approaches.

Harihar Behera

2003-04-23T23:59:59.000Z

322

High speed flow cytometric separation of viable cells  

DOE Patents (OSTI)

Hematopoietic cell populations are separated to provide cell sets and subsets as viable cells with high purity and high yields, based on the number of original cells present in the mixture. High-speed flow cytometry is employed using light characteristics of the cells to separate the cells, where high flow speeds are used to reduce the sorting time.

Sasaki, Dennis T. (Mountain View, CA); Van den Engh, Gerrit J. (Seattle, WA); Buckie, Anne-Marie (Margate, GB)

1995-01-01T23:59:59.000Z

323

Comment on 'A one-way speed of light experiment'  

E-Print Network (OSTI)

A recent paper published in Am. J. Phys. describes an experiment designed to measure the one-way speed of light. Although the experiment is very interesting, in particular to be used in student laboratories, it is in fact determining the two-way speed of light.

Rodrigo de Abreu; Vasco Guerra

2009-11-27T23:59:59.000Z

324

New simulation speed record set on Sequoia | National Nuclear Security  

National Nuclear Security Administration (NNSA)

New simulation speed record set on Sequoia | National Nuclear Security New simulation speed record set on Sequoia | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > New simulation speed record set on Sequoia New simulation speed record set on Sequoia Posted By Office of Public Affairs New simulation speed record set on Sequoia Computer scientists at Lawrence Livermore National Laboratory and

325

CIP methods for hyperbolic system with variable and discontinuous coefficient  

E-Print Network (OSTI)

We propose a multi-moment method for one-dimensional hyperbolic equations with smooth coefficient and piecewise constant coefficient. The method is entirely based on the backward characteristic method and uses the solution and its derivative as unknowns and cubic Hermite interpolation for each computational cell. The exact update formula for solution and its derivative is derived and used for an efficient time integration. At points of discontinuity of wave speed we define a piecewise cubic Hermite interpolation based on immersed interface method. The method is extended to the one-dimensional Maxwell's equations with variable material properties.

Ito, Kazufumi

2011-01-01T23:59:59.000Z

326

The Wind of Variable C in M33  

E-Print Network (OSTI)

We discuss the spectrum of Var C in M33 obtained just before the onset of its current brightening and recent spectra during its present "eruption" or optically thick wind stage. These spectra illustrate the typical LBV transition in apparent spectral type or temperature that characterizes the classical LBV or S Dor-type variability. LBVs are known to have slow, dense winds during their maximum phase. Interestingly, Var C had a slow wind even during its hot, quiescent stage in comparison with the normal hot supergiants with similar temperatures. Its outflow or wind speeds also show very little change between these two states.

Humphreys, Roberta M; Gordon, Michael; Weis, Kerstin; Burggraf, Birgitta; Bomans, D J; Martin, John C

2014-01-01T23:59:59.000Z

327

Kinematic measures and stroke rate variability in elite female 200-m swimmers in the four swimming techniques: Athens 2004 Olympic semi-finalists and French National  

E-Print Network (OSTI)

1 Kinematic measures and stroke rate variability in elite female 200-m swimmers in the four of this work was to study stroke rate variability in elite female swimmers (200-m events, all four techniques semi-finalists (group N, n=64). Since swimming speed (V) is the product of stroke rate (SR) and stroke

Paris-Sud XI, Université de

328

Monitoring variability of multivariate processes  

Science Journals Connector (OSTI)

The paper focuses on determining changes in process variability of multivariate processes. The problem is compounded by the fact that any of the elements in the variance-covariance matrix of variables could change, leading to a change in the process variability. While it may not be feasible to maintain individual control charts for each element of the variance-covariance matrix, some aggregate measure of the variability criteria could be monitored to initially determine if a change has occurred in the process variability. A couple of aggregate measures are proposed and the performance of these suggested measures is explored through a simulation procedure. Compared to the traditional method, which monitors the determinant of the variance-covariance matrix, these alternatives perform well. The performance measure used is the mean time to first detection of a change in the process variability.

Amitava Mitra; Mark Clark

2014-01-01T23:59:59.000Z

329

On the Riemann Function and Irregular Singular Points for Axisymmetric Black Hole Collisions at the Speed of Light  

E-Print Network (OSTI)

The news function providing some relevant information about angular distribution of gravitational radiation in axisymmetric black hole collisions at the speed of light had been evaluated in the literature by perturbation methods, after inverting second-order hyperbolic operators with variable coefficients in two independent variables. More recent work has related the appropriate Green function to the Riemann function for such a class of hyperbolic operators in two variables. The present paper obtains an improvement in the evaluation of the coefficients occurring in the second-order equation obeyed by the Riemann function, which might prove useful for numerical purposes. Eventually, we find under which conditions the original Green-function calculation reduces to finding solutions of an inhomogeneous second-order ordinary differential equation with a non-regular singular point.

Giampiero Esposito; Cosimo Stornaiolo

2002-03-26T23:59:59.000Z

330

High resolution, high speed ultrahigh vacuum microscopy  

SciTech Connect

The history and future of transmission electron microscopy (TEM) is discussed as it refers to the eventual development of instruments and techniques applicable to the real time in situ investigation of surface processes with high resolution. To reach this objective, it was necessary to transform conventional high resolution instruments so that an ultrahigh vacuum (UHV) environment at the sample site was created, that access to the sample by various in situ sample modification procedures was provided, and that in situ sample exchanges with other integrated surface analytical systems became possible. Furthermore, high resolution image acquisition systems had to be developed to take advantage of the high speed imaging capabilities of projection imaging microscopes. These changes to conventional electron microscopy and its uses were slowly realized in a few international laboratories over a period of almost 40 years by a relatively small number of researchers crucially interested in advancing the state of the art of electron microscopy and its applications to diverse areas of interest; often concentrating on the nucleation, growth, and properties of thin films on well defined material surfaces. A part of this review is dedicated to the recognition of the major contributions to surface and thin film science by these pioneers. Finally, some of the important current developments in aberration corrected electron optics and eventual adaptations to in situ UHV microscopy are discussed. As a result of all the path breaking developments that have led to today's highly sophisticated UHV-TEM systems, integrated fundamental studies are now possible that combine many traditional surface science approaches. Combined investigations to date have involved in situ and ex situ surface microscopies such as scanning tunneling microscopy/atomic force microscopy, scanning Auger microscopy, and photoemission electron microscopy, and area-integrating techniques such as x-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, Auger electron spectroscopy, low-energy electron diffraction, temperature programmed desorption, high-resolution electron energy-loss and Fourier-transform infrared spectroscopies, and others. Material systems ranging from atomic layers of metals and semiconductors to biology related depositions are being investigated. In the case of biological materials, however, strict limitations to high-resolution applications are imposed by electron radiation damage considerations.

Poppa, Helmut [National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2004-09-01T23:59:59.000Z

331

Using the Twentieth Century Reanalysis to assess climate variability for the European wind industry  

E-Print Network (OSTI)

We characterise the long-term variability of European near-surface wind speeds using 140 years of data from the Twentieth Century Reanalysis (20CR), and consider the potential of such long-baseline climate data sets for wind energy applications. The low resolution of the 20CR would severely restrict its use on its own for wind farm site-screening. We therefore perform a simple statistical calibration to link it to the higher-resolution ERA-Interim data set (ERAI), such that the adjusted 20CR data has the same wind speed distribution at each location as ERAI during their common period. Using this corrected 20CR data set, wind speeds and variability are characterised in terms of the long-term mean, standard deviation, and corresponding trends. Many regions of interest show extremely weak trends on century timescales, but contain large multidecadal variability. Variations in the form of the wind speed distribution are assessed in terms of its deciles; we find that the commonly-used Weibull distribution often pro...

Bett, Philip E; Clark, Robin T

2014-01-01T23:59:59.000Z

332

Vermont Standard Offer for Qualifying SPEED Resources | Department of  

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

Vermont Standard Offer for Qualifying SPEED Resources Vermont Standard Offer for Qualifying SPEED Resources Vermont Standard Offer for Qualifying SPEED Resources < Back Eligibility Agricultural Commercial Industrial Savings Category Bioenergy Water Buying & Making Electricity Solar Home Weatherization Wind Maximum Rebate Varies by technology Program Info Start Date 09/30/2009 State Vermont Program Type Performance-Based Incentive Rebate Amount Varies by technology Provider VEPP, Inc. '''''Note: The first RFP for the new competitive award process has passed; applications were accepted through May 1, 2013. See the program web site for information regarding future solicitations. ''''' In May 2009, Vermont enacted legislation requiring all Vermont retail electricity providers to purchase electricity generated by eligible

333

New superlong-stroke slow-speed diesel  

SciTech Connect

Changes in the marine market and ship design in recent years created a demand for lower speed two-stroke engines. To meet this demand, MAN B W has added to its MC engine family the new S-versions, with cylinder bores of 80, 70, 60, 50 and 26 cm. The stroke-to-bore ratio was selected to be around 3.8:1, versus 3.2:1 for the previous L-versions. This basically reduced the engine speed to achieve a mean piston speed for improved propeller efficiency, increased the cylinder displacement for higher output, and improved the fuel consumption. 5 figs.

Kunberger, K.

1994-09-01T23:59:59.000Z

334

Engine control system having speed-based timing  

DOE Patents (OSTI)

A control system for an engine having a cylinder is disclosed having an engine valve movable to regulate a fluid flow of the cylinder and an actuator associated with the engine valve. The control system also has a controller in communication with the actuator. The controller is configured to receive a signal indicative of engine speed and compare the engine speed signal with a desired engine speed. The controller is also configured to selectively regulate the actuator to adjust a timing of the engine valve to control an amount of air/fuel mixture delivered to the cylinder based on the comparison.

Willi, Martin L. (Dunlap, IL); Fiveland, Scott B. (Metamora, IL); Montgomery, David T. (Edelstein, IL); Gong, Weidong (Dunlap, IL)

2012-02-14T23:59:59.000Z

335

Coal-fueled high-speed diesel engine development  

SciTech Connect

The objectives of this program are to study combustion feasibility by running Series 149 engine tests at high speeds with a fuel injection and combustion system designed for coal-water-slurry (CWS). The following criteria will be used to judge feasibility: (1) engine operation for sustained periods over the load range at speeds from 600 to 1900 rpm. The 149 engine for mine-haul trucks has a rated speed of 1900 rpm; (2) reasonable fuel economy and coal burnout rate; (3) reasonable cost of the engine design concept and CWS fuel compared to future oil prices.

Not Available

1991-11-01T23:59:59.000Z

336

The constancy, or otherwise, of the speed of light  

E-Print Network (OSTI)

New varying speed of light (VSL) theories as alternatives to the inflationary model of the universe are discussed and evidence for a varying speed of light reviewed. Work linked with VSL but primarily concerned with deriving Planck's black body energy distribution for a gas-like aether using Maxwell statistics is considered also. Doubly Special Relativity, a modification of special relativity to account for observer dependent quantum effects at the Planck scale, is introduced and it is found that a varying speed of light above a threshold frequency is a necessity for this theory.

Daniel J. Farrell; J. Dunning-Davies

2004-06-23T23:59:59.000Z

337

Influence of field potential on the speed of light  

E-Print Network (OSTI)

The paper discusses the affection of the scalar potential on the speed of light in the electromagnetic field, by means of the characteristics of octonion. In the octonion space, the radius vector is combined with the integral of field potentials to become one new radius vector. When the field potentials can not be neglected, the new radius vector will cause the prediction to departure slightly from the theoretical value of the speed of light. The results explain why the speed of light varies in diversiform optical waveguide. And there exist negative refractive indexes due to different scalar potentials in the gravitational field and electromagnetic field.

Zi-Hua Weng

2009-06-07T23:59:59.000Z

338

Taking Control of Green Speed Thomas A. Nikolai, Ph.D.  

E-Print Network (OSTI)

to know about green speed A lot of green speed misinformation Poor communication cited #1 problem GreenTaking Control of Green Speed Thomas A. Nikolai, Ph.D. The Doctor of Green Speed nikolait finds when requesting green speed help are.... #12;The 3 most common answers a superintendent finds when

339

Current Speed in a Magnetic Annular Shock Tube  

Science Journals Connector (OSTI)

A parametric study of the speeds of the current sheet and center?of?gravity of current in a magnetic annular shock tube has been carried out. The parameters varied include: (1) the drive current (2) the polarity of the inner electrode (3) the gas pressure (4) the nature of the gas (5) the radius of the inner electrode and (6) the material of the inner electrode. The most interesting result of the investigation was the observation of limiting speeds for the current sheet and center?of?gravity of current of approximately 8 cm/?sec and 3 cm/?sec respectively. These speeds were not exceeded even under conditions where the magnetic pressure exceeded the dynamic pressure by a factor of 10. The most probable explanation of the limiting speed is that it is due to the inertial drag of material ablated from the insulator at the driver end of the shock tube.

James Keck

1964-01-01T23:59:59.000Z

340

High Speed Flywheels for Integrated Energy Storage and Attitude Control  

E-Print Network (OSTI)

High Speed Flywheels for Integrated Energy Storage and Attitude Control Christopher D. Hall. Decomposition of the space of internal torques separates the attitude control functionfrom the energy storage simultaneously performing energy storage and extraction operations. 1 Introduction The power engineering

Hall, Christopher D.

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


341

Optical system for high-speed Atomic Force Microscope  

E-Print Network (OSTI)

This thesis presents the design and development of an optical cantilever deflection sensor for a high speed Atomic Force Microscope (AFM). This optical sensing system is able to track a small cantilever while the X-Y scanner ...

Lim, Kwang Yong, S.M. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

342

Rotary-linear axes for high speed machining  

E-Print Network (OSTI)

This thesis presents the design, analysis, fabrication, and control of a rotary-linear axis; this axis is a key subsystem for high speed, 5-axis machine tools intended for fabricating centimeter-scale parts. The rotary-linear ...

Liebman, Michael Kevin, 1974-

2001-01-01T23:59:59.000Z

343

A high-speed hysteresis motor spindle for machining applications  

E-Print Network (OSTI)

An analysis of suitable drive technologies for use in a new high-speed machining spindle was performed to determine critical research areas. The focus is on a hysteresis motor topology using a solid, inherently-balanced ...

Bayless, Jacob D. (Jacob Daniel)

2014-01-01T23:59:59.000Z

344

RESEARCH ARTICLE Controlling speed and direction during interception  

E-Print Network (OSTI)

. Turning rate was controlled using a steering wheel and speed was controlled using a foot pedal (Wann and Land 2000), braking (Lee 1976; Yilmaz and Warren 1995), and fly ball catching (Chapman 1968

345

Hydrodynamic evaluation of high-speed semi-SWATH vessels  

E-Print Network (OSTI)

High-speed semi-displacement vessels have enjoyed rapid development and widespread use over the past 25 years. Concurrent with their growth as viable commercial and naval platforms, has been the advancement of three-dimensional ...

Guttenplan, Adam (Adam David)

2007-01-01T23:59:59.000Z

346

Vibration Measurement on Viaduact of Taiwan High Speed Railway  

Science Journals Connector (OSTI)

There were 13 standard spans of variant span length and pier height tested at early stage of Taiwan High Speed Railway’s operation. The test was aimed to verify the actual dynamic responses meeting the design cod...

C. S. Chen; M. H. Chen; C. Y. Wang

2012-01-01T23:59:59.000Z

347

Fact #671: April 18, 2011 Average Truck Speeds  

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

The Federal Highway Administration studies traffic volume and flow on major truck routes by tracking more than 500,000 trucks. The average speed of trucks on selected interstate highways is between...

348

High speed imaging of transient non-Newtonian fluid phenomena  

E-Print Network (OSTI)

In this thesis, I investigate the utility of high speed imaging for gaining scientific insight into the nature of short-duration transient fluid phenomena, specifically applied to the Kaye effect. The Kaye effect, noted ...

Gallup, Benjamin H. (Benjamin Hodsdon), 1982-

2004-01-01T23:59:59.000Z

349

Stable pinch in the SPEED 2 plasma focus  

Science Journals Connector (OSTI)

Conditions of discharge generation in deuterium doped with heavy argon and xenon gases were investigated in experiments in the SPEED 2 plasma focus in the micropinch plasma compression mode and...

W. Kies; G. Decker; U. Berntien; Yu. V. Sidel’nikov…

1999-10-01T23:59:59.000Z

350

Using ADCP Background Sound Levels to Estimate Wind Speed  

Science Journals Connector (OSTI)

It is well known that ambient sound is generated by wind through the process of wave breaking and bubble injection. The resulting sound levels are highly correlated with wind speed and, even though the physical process is not fully understood, ...

Len Zedel

2001-11-01T23:59:59.000Z

351

File:CV WindSpeed.pdf | Open Energy Information  

Open Energy Info (EERE)

WindSpeed.pdf WindSpeed.pdf Jump to: navigation, search File File history File usage Cape Verde-Map Summarizing Average Wind Speed (m/s) Size of this preview: 776 × 600 pixels. Full resolution ‎(1,650 × 1,275 pixels, file size: 246 KB, MIME type: application/pdf) Description Cape Verde-Map Summarizing Average Wind Speed (m/s) Sources ECOWAS Creation Date 2011/11/14 Coordinates 16.002082°, -24.013197° File history Click on a date/time to view the file as it appeared at that time. Date/Time Thumbnail Dimensions User Comment current 11:43, 14 November 2011 Thumbnail for version as of 11:43, 14 November 2011 1,650 × 1,275 (246 KB) STobin (Talk | contribs) You cannot overwrite this file. Edit this file using an external application (See the setup instructions for more information)

352

High-speed low-voltage ultraviolet light source  

Science Journals Connector (OSTI)

A novel quasi-spark gap has been designed and constructed with high-speed and low-spark voltage characteristics. Ultraviolet light generating sparks can be operated at a rate of up to...

Huang, L; Hsu, S C; Kwok, H S

1984-01-01T23:59:59.000Z

353

Progress with a Determination of the Speed of Light  

Science Journals Connector (OSTI)

A programme at the National Physical Laboratory is in progress for the purpose of making a determination of the speed of light (c) to an accuracy of one...8 by measuring the frequency and wavelength of an infra-r...

C. C. Bradley; J. Edwards; D. J. E. Knight…

1972-01-01T23:59:59.000Z

354

Boosting the Next Wave of Accelerators: New Technique Speeds...  

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

as electrons, around a 27 km underground tunnel. When the particle beams reach nearly the speed of light they are steered into head-on collisions. Scientists study the wreckage or...

355

Measuring the speed of dark: Detecting dark energy perturbations  

SciTech Connect

The nature of dark energy can be probed not only through its equation of state but also through its microphysics, characterized by the sound speed of perturbations to the dark energy density and pressure. As the sound speed drops below the speed of light, dark energy inhomogeneities increase, affecting both cosmic microwave background and matter power spectra. We show that current data can put no significant constraints on the value of the sound speed when dark energy is purely a recent phenomenon, but can begin to show more interesting results for early dark energy models. For example, the best fit model for current data has a slight preference for dynamics [w(a){ne}-1], degrees of freedom distinct from quintessence (c{sub s{ne}}1), and early presence of dark energy [{Omega}{sub de}(a<<1){ne}0]. Future data may open a new window on dark energy by measuring its spatial as well as time variation.

Putter, Roland de [Berkeley Lab and University of California, Berkeley, California 94720 (United States); Huterer, Dragan [Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan, 48109 (United States); Linder, Eric V. [Berkeley Lab and University of California, Berkeley, California 94720 (United States); Institute for the Early Universe, Ewha Womans University, Seoul (Korea, Republic of)

2010-05-15T23:59:59.000Z

356

Comments on "Note on varying speed of light theories"  

E-Print Network (OSTI)

In a recent note Ellis criticizes varying speed of light theories on the grounds of a number of foundational issues. His reflections provide us with an opportunity to clarify some fundamental matters pertaining to these theories.

Joao Magueijo; John W. Moffat

2007-05-31T23:59:59.000Z

357

A Theoretical Diagnosis on Light Speed Anisotropy from GRAAL Experiment  

E-Print Network (OSTI)

The light speed anisotropy, i.e., the variation of the light speed with respect to the direction in an "absolute" reference frame, is a profound issue in physics. The one-way experiment, performed at the GRAAL facility of the European Synchrotron Radiation Facility (ESRF) in Grenoble, reported results on the light speed anisotropy by Compton scattering of laser photons on high-energy electrons. So far, most articles concerned with the GRAAL data have established only the upper bounds on the anisotropy parameters based on available theories. We use a new theory of the Lorentz invariance violation to analyse the available GRAAL data and obtain the stringent upper limit of the order $2.4\\times10^{-14}$ on the Lorentz violation parameters. In the meantime, we also can reproduce the allowed light speed anisotropy appearing in the azimuthal distribution of the GRAAL experimental data, and find that the best-fit parameters are compatible with the competitive upper bounds.

Zhou Lingli; Bo-Qiang Ma

2010-09-09T23:59:59.000Z

358

A theoretical diagnosis on light speed anisotropy from GRAAL experiment  

Science Journals Connector (OSTI)

The light speed anisotropy, i.e., the variation of the light speed with respect to the direction in an “absolute” reference frame, is a profound issue in physics. The one-way experiment, performed at the GRAAL facility of the European Synchrotron Radiation Facility (ESRF) in Grenoble, reported results on the light speed anisotropy by Compton scattering of laser photons on high-energy electrons. So far, most articles concerned with the GRAAL data have established only the upper bounds on the anisotropy parameters based on available theories. We use a new theory of the Lorentz invariance violation to analyse the available GRAAL data and obtain the stringent upper limit of the order 2.4 × 10 - 14 on the Lorentz violation parameters. In the meantime, we also can reproduce the allowed light speed anisotropy appearing in the azimuthal distribution of the GRAAL experimental data, and find that the best-fit parameters are compatible with the competitive upper bounds.

Lingli Zhou; Bo-Qiang Ma

2012-01-01T23:59:59.000Z

359

Selection automatique de variables pertinentes  

E-Print Network (OSTI)

S´election automatique de variables pertinentes Vers la d´ecouverte de nouvelles modalit´es sensori-motrices corr´elations entre ses variables sensori-motrices afin d'apprendre `a r´esoudre sa t^ache d

Boyer, Edmond

360

Energy and Reliability Considerations For Adjustable Speed Driven Pumps  

E-Print Network (OSTI)

ENERGY AND RELIABILITY CONSIDERATIONS FOR ADJUSTABLE SPEED DRIVEN PUMPS Don Casada Senior Development Associate ABSTRACT Centrifugal devices such as pumps, fans, and compressors follow a general set of speed affinity laws: Q2 = QI *( N z... there is no static head, the system head, like the pump head, is proportional to the velocity, or flow rate, squared. As a result. the pump affinity laws also indicate how the pump and system will work together to define the operating point in such a system...

Casada, D.

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


361

f(R) cosmological solutions with varying speed of light  

E-Print Network (OSTI)

We consider f(R) modified gravity theories for describing varying speed of light in a spatially flat FRW model, and find some exact solutions. Also we examine the dynamics of this model by dynamical system method assuming a LambdaCDM background and we find some exact solutions by considering the character of critical points of the theory in both formalisms. The behaviour of the speed of light is obtained.

Azam Izadi; Ali Shojai

2010-01-24T23:59:59.000Z

362

Operational indistinguishably of varying speed of light theories  

E-Print Network (OSTI)

The varying speed of light theories have been recently proposed to solve the standard model problems and anomalies in the ultra high energy cosmic rays. These theories try to formulate a new relativity with no assumptions about the constancy of the light speed. In this regard, we study two theories and want to show that these theories are not the new theories of relativity, but only re-descriptions of Einstein's special relativity.

Nosratollah Jafari; Ahmad Shariati

2003-12-01T23:59:59.000Z

363

The Speed of Light as a Dilaton Field  

E-Print Network (OSTI)

Through dimensional analysis, eliminating the physical time, we identify the speed of light as a dilaton field. This leads to a restmass zero, spin zero gauge field which we call the speedon field. The complete Lagrangian for gravitational, electromagnetic and speedon field interactions with a charged scalar field, representing matter, is given. We then find solutions for the gravitational-electromagnetic-speedon field equations. This then gives an expression for the speed of light.

Walter Wyss

1997-11-20T23:59:59.000Z

364

Measurement of CNGS muon neutrino speed with Borexino  

E-Print Network (OSTI)

We have measured the speed of muon neutrinos with the Borexino detector using short-bunch CNGS beams. The final result for the difference in time-of-flight between a =17 GeV muon neutrino and a particle moving at the speed of light in vacuum is {\\delta}t = 0.8 \\pm 0.7stat \\pm 2.9sys ns, well consistent with zero.

Borexino Collaboration

2012-07-30T23:59:59.000Z

365

On-line implementation of an adaptive speed filter and its experimental demonstration  

E-Print Network (OSTI)

previously developed neural network speed filter is implemented for on-line induction motor speed estimation. The speed filter is constructed using a combination of five neural networks. A neural networks framework developed in this work is used to construct...

Abdul, Anis Mohamed

2012-06-07T23:59:59.000Z

366

The effect of imbalance distribution and measurement locations on critical speeds in a turboprop engine rotor  

E-Print Network (OSTI)

The critical speeds of a turbomachine can be defined as the speeds at which synchronous response to imbalance is maximum (Vance,1988). Identifying the proper placement of critical speeds is very important in the design process of turbomachinery...

Marin, Manuel

2012-06-07T23:59:59.000Z

367

Observations of sound-speed fluctuations on the New Jersey continental shelf in the summer of 2006  

Science Journals Connector (OSTI)

Environmental sensors moored on the New Jersey continental shelf tracked constant density surfaces (isopycnals) for 35 days in the summer of 2006. Sound-speed fluctuations from internal-wave vertical isopycnal displacements and from temperature/salinity variability along isopycnals (spiciness) are analyzed using frequency spectra and vertical covariance functions. Three varieties of internal waves are studied: Diffuse broadband internal waves (akin to waves fitting the deep water Garrett/Munk spectrum) internal tides and to a lesser extent nonlinear internal waves. These internal-wave contributions are approximately distinct in the frequency domain. It is found that in the main thermocline spicy thermohaline structure dominates the root mean square sound-speed variability with smaller contributions coming from (in order) nonlinear internal waves diffuse internal waves and internal tides. The frequency spectra of internal-wave displacements and of spiciness have similar form likely due to the advection of variable-spiciness water masses by horizontal internal-wave currents although there are technical limitations to the observations at high frequency. In the low-frequency internal-wave band the internal-wave spectrum follows frequency to the ?1.81 power whereas the spice spectrum shows a ?1.73 power. Mode spectra estimated via covariance methods show that the diffuse internal-wave spectrum has a smaller mode bandwidth than Garrett/Munk and that the internal tide has significant energy in modes one through three.

John A. Colosi; Timothy F. Duda; Ying-Tsong Lin; James F. Lynch; Arthur E. Newhall; Bruce D. Cornuelle

2012-01-01T23:59:59.000Z

368

A High-Speed LED Driver That Sweeps Out the Remaining Carriers for Visible Light Communications  

Science Journals Connector (OSTI)

The modulation speed of light-emitting diodes (LEDs) must be increased to improve the speed, increase the bandwidth, and miniaturize the hardware of visible light communication (VLC)...

Kishi, Toshiki; Tanaka, Hiroyuki; Umeda, Yohtaro; Takyu, Osamu

2013-01-01T23:59:59.000Z

369

ULTRACAM: an ultra-fast, triple-beam CCD camera for high-speed astrophysics  

E-Print Network (OSTI)

ULTRACAM is a portable, high-speed imaging photometer designed to study faint astronomical objects at high temporal resolutions. ULTRACAM employs two dichroic beamsplitters and three frame-transfer CCD cameras to provide three-colour optical imaging at frame rates of up to 500 Hz. The instrument has been mounted on both the 4.2-m William Herschel Telescope on La Palma and the 8.2-m Very Large Telescope in Chile, and has been used to study white dwarfs, brown dwarfs, pulsars, black-hole/neutron-star X-ray binaries, gamma-ray bursts, cataclysmic variables, eclipsing binary stars, extrasolar planets, flare stars, ultra-compact binaries, active galactic nuclei, asteroseismology and occultations by Solar System objects (Titan, Pluto and Kuiper Belt objects). In this paper we describe the scientific motivation behind ULTRACAM, present an outline of its design and report on its measured performance.

V. S. Dhillon; T. R. Marsh; M. J. Stevenson; D. C. Atkinson; P. Kerry; P. T. Peacocke; A. J. A. Vick; S. M. Beard; D. J. Ives; D. W. Lunney; S. A. McLay; C. J. Tierney; J. Kelly; S. P. Littlefair; R. Nicholson; R. Pashley; E. T. Harlaftis; K. O'Brien

2007-04-19T23:59:59.000Z

370

Dynamical System Approach to Cosmological Models with a Varying Speed of Light  

E-Print Network (OSTI)

Methods of dynamical systems have been used to study homogeneous and isotropic cosmological models with a varying speed of light (VSL). We propose two methods of reduction of dynamics to the form of planar Hamiltonian dynamical systems for models with a time dependent equation of state. The solutions are analyzed on two-dimensional phase space in the variables $(x, \\dot{x})$ where $x$ is a function of a scale factor $a$. Then we show how the horizon problem may be solved on some evolutional paths. It is shown that the models with negative curvature overcome the horizon and flatness problems. The presented method of reduction can be adopted to the analysis of dynamics of the universe with the general form of the equation of state $p=\\gamma(a)\\epsilon$. This is demonstrated using as an example the dynamics of VSL models filled with a non-interacting fluid. We demonstrate a new type of evolution near the initial singularity caused by a varying speed of light. The singularity-free oscillating universes are also admitted for positive cosmological constant. We consider a quantum VSL FRW closed model with radiation and show that the highest tunnelling rate occurs for a constant velocity of light if $c(a) \\propto a^n$ and $-1 < n \\le 0$. It is also proved that the considered class of models is structurally unstable for the case of $n < 0$.

Marek Szydlowski; Adam Krawiec

2002-12-16T23:59:59.000Z

371

Quantum Creation of a Universe with varying speed of light: $?$-problem and Instantons  

E-Print Network (OSTI)

This article is dedicated to cosmologies with variable speed of light (VSL) - models, which one can consider as a particular case of models of a modified gravitation. In quantum cosmology the closed universe can spontaneously nucleate out of the state with no classical space and time. As known, in case of classical cosmology with varying speed of light $c(t)$ it is possible to solve the horizon problem, the flatness problem and the $\\Lambda$-problem if $c=sa^n$ with $s$=const and $n0$. Thus, the semiclassical tunneling nucleation probability in VSL quantum cosmology is very different from that in quantum cosmology with $c$=const. In particular, it can be strongly suppressed for large values of $\\Lambda$. In addition, we propose two instantons that describe the nucleation of closed universes in VSL models. These solutions are akin to the Hawking-Turok instanton in sense of O(4) invariance but, unlike to it, are both non-singular. Moreover, using those solutions we can obtain the probability of nucleation which is suppressed for large value of $\\Lambda$ too. We also discuss some unusual properties of models with $n>0$.

Artyom V. Yurov; Valerian A. Yurov

2008-12-27T23:59:59.000Z

372

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 12, NO. 1, JANUARY 1997 87 Fuzzy Logic Based Intelligent Control of a Variable  

E-Print Network (OSTI)

system. The generation system has fuzzy logic control with vector control in the inner loops. A fuzzyIEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 12, NO. 1, JANUARY 1997 87 Fuzzy Logic Based a variable speed wind genera- tion system where fuzzy logic principles are used for efficiency optimization

Simões, Marcelo Godoy

373

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles are only allowed access to roadways with speeds limits

374

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles may only be used on roads that have a posted speed limit

375

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles are only permitted on highways with speed limits up to

376

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles may only travel on roadways with a posted speed limit of

377

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles may only be used on roadways with posted speed limits of

378

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles may operate on streets with posted speed limits of 35

379

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles may not operate on roads with posted speed limits of

380

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles may only travel on roadways with a posted speed limit of

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


381

MEASUREMENT OF WIND SPEED FROM COOLING LAKE THERMAL IMAGERY  

SciTech Connect

The Savannah River National Laboratory (SRNL) collected thermal imagery and ground truth data at two commercial power plant cooling lakes to investigate the applicability of laboratory empirical correlations between surface heat flux and wind speed, and statistics derived from thermal imagery. SRNL demonstrated in a previous paper [1] that a linear relationship exists between the standard deviation of image temperature and surface heat flux. In this paper, SRNL will show that the skewness of the temperature distribution derived from cooling lake thermal images correlates with instantaneous wind speed measured at the same location. SRNL collected thermal imagery, surface meteorology and water temperatures from helicopters and boats at the Comanche Peak and H. B. Robinson nuclear power plant cooling lakes. SRNL found that decreasing skewness correlated with increasing wind speed, as was the case for the laboratory experiments. Simple linear and orthogonal regression models both explained about 50% of the variance in the skewness - wind speed plots. A nonlinear (logistic) regression model produced a better fit to the data, apparently because the thermal convection and resulting skewness are related to wind speed in a highly nonlinear way in nearly calm and in windy conditions.

Garrett, A; Robert Kurzeja, R; Eliel Villa-Aleman, E; Cary Tuckfield, C; Malcolm Pendergast, M

2009-01-20T23:59:59.000Z

382

Critical speed of railway tracks. detailed and simplified approaches  

Science Journals Connector (OSTI)

Abstract The dynamic amplification effects of the response due to a moving load on the surface of an elastic solid has been object of research for more than a century. However, if in the beginning of the last century the problem had only theoretical interest, this is no longer true. Indeed, the recent advancements in the rolling stock, which can now reach speeds higher than 500 km/h, brought this kind of problems to the engineering practice, mainly to high speed railway engineering. The present paper approaches this problem focusing on railway engineering. The departing point is the theoretical formulation of the critical speed problem of a moving load on the surface of an elastic solid. From the usage of 2.5D detailed models it was possible to understand the influence of the embankment and track properties on the critical speed. However, to avoid complex numerical models, which are very demanding from the computational point of view, a simplified approach is proposed for the computation of the critical speed of track-embankment-ground systems. The results of the simplified approach are compared to those achieved by detailed methods, also presented in this paper, and the proposed expedite methodology is found to be very accurate.

Pedro Alves Costa; Aires Colaço; Rui Calçada; António Silva Cardoso

2014-01-01T23:59:59.000Z

383

Variable Structure Control of a Doubly Fed Induction Generator for Wind Energy Conversion Systems  

Science Journals Connector (OSTI)

Abstract This paper presents the powers control of a variable speed wind turbine (WT) device based on a doubly fed induction generator (DFIG). Indeed, to increase the efficiency of the WT system, a robust variable structure control has been applied. DFIG has been previously presented in several works with diverse control diagrams using generally conventional PI controllers. Nevertheless, this type of controllers does not sufficiently handle some of WT resource characteristics such as wind fluctuations effects. Indeed, these can reduce WT performances. Furthermore, DFIG parameter variations should be accounted for. In this context, this paper proposes a high-order sliding mode to control the WT DFIG. Simulation results show that the proposed approach presents attractive features such as chattering-free behavior, good response to speed variations and robustness against machine parameter variations compared to the conventional first order sliding mode technique and even fuzzy sliding mode one.

E. Bounadja; A. Djahbar; Z. Boudjema

2014-01-01T23:59:59.000Z

384

Heat pump simulation model and optimal variable-speed control for a wide range of cooling conditions  

E-Print Network (OSTI)

The steady-state air-to-air heat pump model presented in this thesis was developed from the first principles. The main objective was to develop a heat pump model that can be used as a part of larger simulation models, and ...

Zakula, Tea

2010-01-01T23:59:59.000Z

385

Modelling and control of a variable speed wind turbine driving doubly fed induction generator using three-level PWM converter  

Science Journals Connector (OSTI)

The aim of this researcher is to develop a complete wind central model driven doubly fed induction generator (DFIG) which feeds an AC power grid. For that, two-pulse width modulated (PWM) voltage converters are connected back to back between the rotor terminals of DFIG and the utility grid via a common DC link, in there, our contribution will appear in the utilisation of three levels voltage inverters in order to ameliorate the energy quality. The simulation was carried out on a 2 MW wind-turbine driven DFIG system and the developed unified model validity and the proposed control strategies feasibility are all confirmed by the simulated results.

Fairouz Kendouli; Khoudir Abed; Khalil Nabti; Hocine Benalla

2012-01-01T23:59:59.000Z

386

Model simulations of dust sources and transport in the global atmosphere: Effects of soil erodibility and wind speed variability  

E-Print Network (OSTI)

IND, Indian Ocean, Persian Gulf, and the Red Sea; MED,Saudi Arabia, near the Persian Gulf and in southern Iraq (

Grini, Alf; Myhre, G.; Zender, C. S.; Isaksen, I. S. A.

2005-01-01T23:59:59.000Z

387

Talladega Speeds Up Energy Efficiency in Schools | Department of Energy  

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

Talladega Speeds Up Energy Efficiency in Schools Talladega Speeds Up Energy Efficiency in Schools Talladega Speeds Up Energy Efficiency in Schools July 29, 2010 - 3:00pm Addthis Kevin Craft "We have two schools that were built in the 1930s that have never had proper insulation," says Alex Stewart, the energy manager of Talladega County Schools. "One of our schools was built twenty years ago and never had its HVAC system replaced" For school systems seeking to reduce costs and be more energy efficient, building age and HVAC condition matter a great deal. 17 schools - 10 year ROI With 17 schools, the Talladega County School System is making a concerted effort to reduce energy use. Prior to receiving a $756,000 grant through the U.S. Department of Energy via the American Recovery and Reinvestment

388

NETL Shares Computing Speed, Efficiency to Tackle Energy Technology  

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

Shares Computing Speed, Efficiency to Tackle Energy Technology Shares Computing Speed, Efficiency to Tackle Energy Technology Barriers NETL Shares Computing Speed, Efficiency to Tackle Energy Technology Barriers March 29, 2012 - 1:00pm Addthis Washington, DC - One of the world's fastest supercomputers will be installed at the Office of Fossil Energy's National Energy Technology Laboratory (NETL) this summer to help develop solutions to carbon capture, utilization and storage (CCUS) technology barriers. NETL's new supercomputer, to be installed at the Simulation-BasedEngineering User Center, is a powerful and energy-efficient modeling tool.Housed at NETL's Simulation-Based Engineering User Center, a facility primarily devoted to advancing CCUS science and technology -- the new supercomputer will be used to develop and deploy the advanced

389

Talladega Speeds Up Energy Efficiency in Schools | Department of Energy  

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

Talladega Speeds Up Energy Efficiency in Schools Talladega Speeds Up Energy Efficiency in Schools Talladega Speeds Up Energy Efficiency in Schools July 29, 2010 - 3:00pm Addthis Kevin Craft "We have two schools that were built in the 1930s that have never had proper insulation," says Alex Stewart, the energy manager of Talladega County Schools. "One of our schools was built twenty years ago and never had its HVAC system replaced" For school systems seeking to reduce costs and be more energy efficient, building age and HVAC condition matter a great deal. 17 schools - 10 year ROI With 17 schools, the Talladega County School System is making a concerted effort to reduce energy use. Prior to receiving a $756,000 grant through the U.S. Department of Energy via the American Recovery and Reinvestment

390

Goodyear Speeding Up on Energy Savings | Department of Energy  

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

Goodyear Speeding Up on Energy Savings Goodyear Speeding Up on Energy Savings Goodyear Speeding Up on Energy Savings March 8, 2010 - 11:12am Addthis The Goodyear Blimp flies over Goodyear's tire plant in Union City, Tenn. | Photo courtesy of Goodyear The Goodyear Blimp flies over Goodyear's tire plant in Union City, Tenn. | Photo courtesy of Goodyear Joshua DeLung The Goodyear tire plant in Union City, Tenn., is saving energy, which helps keep the plant's operating costs down. A Save Energy Now assessment from the U.S. Department of Energy in 2006 identified opportunities to improve the efficiency of the plant's steam system. Working with a DOE energy expert, employees, including Dennis Burden, an energy manager for Goodyear, learned how to analyze the plant's steam system and identify natural gas savings to improve

391

Ultra-high-speed optical and electronic distributed devices  

SciTech Connect

This report summarizes work on the development of ultra-high-speed semiconductor optical and electronic devices. High-speed operation is achieved by velocity matching the input stimulus to the output signal along the device`s length. Electronic devices such as field-effect transistors (FET`s), should experience significant speed increases by velocity matching the electrical input and output signals along the device. Likewise, optical devices, which are typically large, can obtain significant bandwidths by velocity matching the light being generated, detected or modulated with the electrical signal on the device`s electrodes. The devices discussed in this report utilize truly distributed electrical design based on slow-wave propagation to achieve velocity matching.

Hietala, V.M.; Plut, T.A.; Kravitz, S.H.; Vawter, G.A.; Wendt, J.R.; Armendariz, M.G.

1995-08-01T23:59:59.000Z

392

A novel clutchless multiple-speed transmission for electric axles  

Science Journals Connector (OSTI)

Fully electric vehicles and range-extended electric vehicles can be characterised by a multitude of possible powertrain layouts, many of them currently under investigation and comparison. This contribution presents a novel clutchless seamless four-speed transmission system which can be concurrently driven by two electric motor drives, for use in fully electric vehicles or electric axles for through-the-road parallel hybrid electric vehicles. The transmission system allows the electric motors to work in their high efficiency region for a longer period during a typical driving schedule. This paper describes the layout of the novel transmission system, the equations for modelling its dynamics and the criteria for the selection of the best gearshift maps for energy efficiency. Finally, an energy consumption and performance comparison between the novel drivetrain, a conventional single-speed electric drivetrain and a double-speed electric drivetrain is discussed in detail for two case study vehicles.

Aldo Sorniotti; Thomas Holdstock; Mike Everitt; Marco Fracchia; Fabio Viotto; Carlo Cavallino; Stefano Bertolotto

2013-01-01T23:59:59.000Z

393

Van Allen probes pinpoint driver of speeding electrons  

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

Van Allen probes pinpoint driver of speeding electrons Van Allen probes pinpoint driver of speeding electrons Van Allen probes pinpoint driver of speeding electrons Los Alamos researchers believe they have solved a lingering mystery about how electrons within Earth's radiation belt can suddenly become energetic enough to kill orbiting satellites. July 25, 2013 Artist's rendering of mechanism within Van Allen radiation belts An artist's rendering of a mechanism within the Van Allen radiation belts that can accelerate electrons to satellite-killing energies. The mechanism was discovered by a group of scientists using data from NASA's Van Allen Probes (formerly known as the Radiation Belt Storm Probes). Researchers, led by Los Alamos National laboratory space physicist Geoffrey Reeves, believe that electromagnetic waves within the Van Allen belts themselves

394

Speeding Up Science Data Transfers Between Department of Energy Facilities  

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

Speeding Up Science Speeding Up Science Data Transfers Between Department of Energy Facilities Speeding Up Science Data Transfers Between Department of Energy Facilities May 16, 2009 As scientists conduct cutting-edge research with ever more sophisticated techniques, instruments, and supercomputers, the data sets that they must move, analyze, and manage are increasing in size to unprecedented levels. The ability to move and share data is essential to scientific collaboration, and in support of this activity network and systems engineers from the Department of Energy's (DOE) Energy Sciences Network (ESnet), National Energy Research Scientific Computing Center (NERSC) and Oak Ridge Leadership Computing Facility (OLCF) are teaming up to optimize wide-area network (WAN) data transfers.

395

Reducing Photobleaching in STED Microscopy with Higher Scanning Speed  

E-Print Network (OSTI)

Photobleaching is a major limitation of super-resolution STED microscopy. We show that the photobleaching rate in STED microscopy is slowed down by scanning with a higher linear speed, enabled by the large field of view in our custom-built resonant-scanning STED microscope. The effect of scanning speed on photobleaching is more remarkable at higher levels of depletion laser irradiance. With a depletion irradiance of 0.4 GW/cm$^2$ (time average), we were able to slow down the photobleaching of the Atto 647N dye by 80% with 8-fold faster scanning. Photobleaching is primarily caused by the depletion light acting upon the excited fluorophores. Experimental data qualitatively agree with a theoretical model. Our results encourage further increasing linear scanning speed for photobleaching reduction in STED microscopy.

Wu, Yong

2014-01-01T23:59:59.000Z

396

Hubble's law and faster than light expansion speeds  

E-Print Network (OSTI)

Naively applying Hubble's law to a sufficiently distant object gives a receding velocity larger than the speed of light. By discussing a very similar situation in special relativity, we argue that Hubble's law is meaningful only for nearby objects with non-relativistic receding speeds. To support this claim, we note that in a curved spacetime manifold it is not possible to directly compare tangent vectors at different points, and thus there is no natural definition of relative velocity between two spatially separated objects in cosmology. We clarify the geometrical meaning of the Hubble's receding speed v by showing that in a Friedmann-Robertson-Walker spacetime if the four-velocity vector of a comoving object is parallel-transported along the straight line in flat comoving coordinates to the position of a second comoving object, then v/c actually becomes the rapidity of the local Lorentz transformation, which maps the fixed four-velocity vector to the transported one.

Ali Kaya

2011-07-26T23:59:59.000Z

397

Brane World Cosmologies with Varying Speed of Light  

E-Print Network (OSTI)

We study cosmologies in the Randall-Sundrum models, incorporating the possibility of time-varying speed of light and Newton's constant. The cosmologies with varying speed of light (VSL) were proposed by Moffat and by Albrecht and Magueijo as an alternative to inflation for solving the cosmological problems. We consider the case in which the speed of light varies with time after the radion or the scale of the extra dimension has been stabilized. We elaborate on the conditions under which the flatness problem and the cosmological constant problem can be resolved. We find that the RS models are more restrictive about possible desirable VSL cosmological models than the standard general relativity. Particularly, the VSL cosmologies may provide with a possible mechanism for bringing the quantum corrections to the fine-tuned brane tensions after the SUSY breaking under control.

Donam Youm

2001-01-31T23:59:59.000Z

398

Comment on 'Model-dependence of Shapiro time delay and the "speed of gravity/speed of light" controversy'  

E-Print Network (OSTI)

In a recent paper published in Classical and Quantum Gravity, 2004, vol. 21, p. 3803 Carlip used a vector-tensor theory of gravity to calculate the Shapiro time delay by a moving gravitational lens. He claimed that the relativistic correction of the order of v/c beyond the static part of the Shapiro delay depends on the speed of light c and, hence, the Fomalont-Kopeikin experiment is not sensitive to the speed of gravity c_g. In this letter we analyze Carlip's calculation and demonstrate that it implies a gravitodynamic (non-metric) system of units based on the principle of the constancy of the speed of gravity but it is disconnected from the practical method of measurement of astronomical distances based on the principle of the constancy of the speed of light and the SI metric (electrodynamic) system of units. Re-adjustment of theoretically-admissible but practically unmeasurable Carlip's coordinates to the SI metric system of units used in JPL ephemeris, reveals that the velocity-dependent correction to the static part of the Shapiro time delay does depend on the speed of gravity c_g as shown by Kopeikin in Classical and Quantum Gravity, 2004, vol. 21, p. 1. This analysis elucidates the importance of employing the metric system of units for physically meaningful interpretation of gravitational experiments.

Sergei M. Kopeikin

2005-10-10T23:59:59.000Z

399

Speed-gradient principle for nonstationary processes in thermodynamics  

E-Print Network (OSTI)

The speed-gradient variational principle (SG-principle) is formulated and applied to thermodynamical systems. It is shown that Prigogine's principle of minimum entropy production and Onsager's symmetry relations can be interpreted in terms of the SG-principle and, therefore, are equivalent to each other. In both cases entropy of the system plays a role of the goal functional. The speed-gradient formulation of thermodynamic principles provide their extended versions, describing transient dynamics of nonstationary systems far from equilibrium. As an example a model of transient (relaxation) dynamics for maximum entropy principle is derived.

Alexander L. Fradkov

2007-01-28T23:59:59.000Z

400

Harmonic mean, the Gamma factor and Speed of Light  

E-Print Network (OSTI)

The relationship between the harmonic mean and special relativity is concisely elucidated. The arguments in favor and against SRT are explored. It is shown that the ratio of the speed of light to the harmonic mean of the onward and return speeds of light in a moving frame under Newtonian mechanics, when equitably distributed between space and time as a correction, leads to the Lorentz transformation. This correction implies an apparent contraction of objects and time dilation. However, the symmetry of the onward and inverse transformations give a different meaning to the gamma factor

Chandru Iyer

2008-11-05T23:59:59.000Z

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


401

A Simple Cosmological Model with Decreasing Light Speed  

E-Print Network (OSTI)

An alternative model describing the dynamics of a flat Universe without cosmological constant and allowing a gradual change of c with time is proposed. New relationships of redshift vs. distance and cosmic background radiation temperature are given. Values for the Universal radius, matter density, Hubble parameter, light deceleration, cosmic age and recombination time are obtained. Distant SNeIa faintness is explained within this decelerating, matter-dominated Universe without invoking dark energy. Horizon, flatness and other problems of standard Big Bang cosmology are solved without the need of inflation. The top speed of any signal, force, particle or wave at any time is limited by the expansion speed of the Universe itself.

Juan Casado Gimenez

2003-10-07T23:59:59.000Z

402

Observations of Philippine Sea sound-speed perturbations, and the contributions from internal waves and tides, and spicy thermohaline structure  

Science Journals Connector (OSTI)

In the PhilSea09 pilot study two moorings equipped with temperature (T) conductivity (C) and pressuresensors along with upper ocean ADCP monitored ocean variability for a month in the Spring. The measurements reveal an energetic and nonlinear mixed diurnal-semidiurnal internal tide a diffuse Garrett-Munk (GM) type internal wave field at or above the reference GM energy level and a strong eddy field. One mooring which was equipped with pumped sensors for enhanced salinity (S) resolution was able to accurately quantify T and S variability along isopycnals (spice). The spice contribution to sound-speed fluctuation is observed to be strong near the mixed layer but significantly weaker than the other contributions in the main thermocline. Frequency spectra as well as vertical covariance functions will be presented to quantify the temporal and vertical spatial scales of the observed fluctuations.

John Colosi; Brian Dushaw; Lora Van Uffelen; Matt Dzieciuch; Bruce Cornuelle; Peter Worcester

2011-01-01T23:59:59.000Z

403

Speed control of DC motor based on neural net and fuzzy logic  

Science Journals Connector (OSTI)

This paper presented the speed control of DC motor based on neural net and fuzzy logic. To bypass the difficulties caused by system constraints and modelling uncertainties of the speed control of DC motor a neural network approach for on-line speed control ... Keywords: DC motor, fuzzy logic, neural network, speed control

Zahra Moravej

2005-09-01T23:59:59.000Z

404

Power Limitation Control for a PMSG-Based Marine Current Turbine at High Tidal Speed and  

E-Print Network (OSTI)

Power Limitation Control for a PMSG-Based Marine Current Turbine at High Tidal Speed and Strong Sea Abstract--This paper deals with the control strategies for a fixed-pitch marine current turbine (MCT) when the nominal MPPT tracking speed during high speed marine currents. In the speed control strategy, the turbine

Paris-Sud XI, Université de

405

A review on sensorless techniques for sustainable reliablity and efficient variable frequency drives of induction motors  

Science Journals Connector (OSTI)

Abstract Variable frequency drives (VFDs) can provide reliable dynamic systems and significant savings in energy usage and costs of the induction motors (IMs). Sensorless controlled IM drives have advantages in terms of efficiency enhancement and energy savings for critical applications such as electric vehicles, high performance machine tools, fans, compressors, etc. IM drives without having speed sensors or optical encoders mounted at the motor shaft are attractive because of their lower cost and higher reliability. When mechanical speed sensor is removed, the rotor speed information is estimated using the measured quantities of stator voltages and currents at the IM terminals. This paper highlights the sensorless techniques applied to the IM drives for sustainable reliability and energy savings. Overview on the IM mathematical model is briefly summarized to establish a physical basis for the sensorless schemes used. Further, the different types of IM-VFDs are presented in the paper. The main focus of this review is on the sensorless estimation techniques which are being applied to make IM-VFDs more effective during wide speed operations including very-high and very-low speed regions.

Ibrahim M. Alsofyani; N.R.N. Idris

2013-01-01T23:59:59.000Z

406

A wind speed retrieval algorithm by combining 6 and 10 GHz data from Advanced Microwave Scanning Radiometer: Wind speed inside hurricanes  

Science Journals Connector (OSTI)

A wind speed retrieval algorithm was developed using 6 and ... aboard AQUA, for the purpose of retrieving wind speed inside rainstorms, primarily hurricanes and typhoons. ... because the brightness temperature se...

Akira Shibata

2006-06-01T23:59:59.000Z

407

Torque modelling for optimising fuel economy in variable compression engines  

Science Journals Connector (OSTI)

Fuel optimal control of a variable compression engine is studied and it is shown that a crucial component is the model for the engine torque. A model for the produced work that captures the important effects of ignition and compression ratio is proposed and investigated. The main task for the model is to be a mean for determining the fuel optimal control signals, for each requested engine torque and speed. The contribution is a model suitable for finding this optimal combination. This model consists of well-known components, and the novelty lies in the compilation and validation of the control-oriented efficiency model for a variable compression engine. The modelling and validation is performed on a multicylinder variable compression engine using two fuels with different octane rating. Despite the models simplicity, it describes the indicated work with good accuracy, and suits its purpose of finding optimal control signals. In the evaluation, it is shown that a fuel optimal controller based on the proposed model captures the optimal IMEP to within 1.2%. This corresponds to a loss in engine efficiency that is in the range of 0.5% units or less.

Ylva Nilsson; Lars Eriksson; Martin Gunnarsson

2008-01-01T23:59:59.000Z

408

Space?time scales of sound?speed perturbations observed in the Philippine Sea: Contributions from internal waves and tides, eddies, and spicy thermohaline structure.  

Science Journals Connector (OSTI)

The Philippine Sea is a dynamic ocean basin with complex multi?scale sound speed structure. Therefore the PhilSea09 and PhilSea10 experiments have put significant resources toward quantifying the space?time scales of this sound speed variability so that the acoustic transmission data can be properly interpreted. In the PhilSea09 pilot study two moorings equipped with temperature (T) conductivity (C) and pressure sensors along with upper ocean ADCP monitored ocean variability for a month in the Spring. The measurements reveal an energetic and nonlinear mixed diurnal?semidiurnal internal tide a diffuse Garrett–Munk (GM) type internal wave field at or above the reference GM energy level and a strong eddy field. One mooring which was equipped with pumped sensors for enhanced salinity (S) resolution was able to accurately quantify T and S variability along isopycnals (spice). The spice contribution to sound speed fluctuation is strong near the mixed layer but is significantly weaker than the other contributions in the main thermocline. Frequency spectra as well as vertical covariance functions will be presented to quantify the temporal and vertical spatial scales of the observed fluctuations.

John A. Colosi; Brian Dushaw; Rex K. Andrew; Lora J. Van Effelen; Matthew A. Dzieciuch; Peter F. Worcester

2010-01-01T23:59:59.000Z

409

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a self-propelled motor vehicle that

410

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled motor vehicle, other than

411

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles may only operate on private and public roads and streets

412

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways Low-speed vehicles are only permitted to operate on roadways with posted

413

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled motor vehicle, other than

414

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled motor vehicle with an

415

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle, including a neighborhood electric vehicle, is defined

416

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled vehicle that can reach

417

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled electric vehicle that has

418

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled vehicle with a maximum

419

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled vehicle that is capable of

420

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled electric vehicle capable

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


421

Speed-and Facility-Specific Emission Estimates for On-Road Light-Duty Vehicles based on Real-World Speed Profiles  

E-Print Network (OSTI)

06-1096 Speed- and Facility-Specific Emission Estimates for On-Road Light-Duty Vehicles based on Real-World Speed Profiles By H. Christopher Frey, Ph.D. Professor Department of Civil, Construction demand and land use models such as TransCAD, TranPlan or TRANUS produce average link speed and link VMT

Frey, H. Christopher

422

The Engineering Management of Speed Robert C. Leachman  

E-Print Network (OSTI)

of imputing an overall economic value to engineering projects that impact lead time. Practical analytical evaluations of engineers and managers rarely measure the total economic impact of improvements made1 The Engineering Management of Speed Robert C. Leachman Dept. of Industrial Engineering

Kammen, Daniel M.

423

Ultrafast Digital Electronics: Optimizing the speed of a  

E-Print Network (OSTI)

Ultrafast Digital Electronics: Optimizing the speed of a Josephson junction J. K. Freericks and P of Naval Research Preprint: cond-mat/0001269 J. K. Freericks, Georgetown University, Josephson Junction symmetry (examples include YBCO and BSCCO). J. K. Freericks, Georgetown University, Josephson Junction talk

Freericks, Jim

424

High-speed gears for gas turbine drive  

SciTech Connect

Recently, Lufkin Industries, Power Transmission Div., full-load tested a high-speed gear designed to couple a 50 Hz electric power generator to a GE LM6000 gas turbine for a power generation project in Australia. The gear is rated 52.2 MW to match the output of the LM6000 gas turbine believed to be one of the largest gear testing operations for this type and size of gear. Each gear drive manufactured by Lufkin is full-speed tested to verify its performance. Tests performed on high-speed units duplicate field conditions, as closely as possible, in order to verify critical speed analysis results and new bearing designs, if used. Lufkin also tests design techniques used in the development of new products. The finite element analysis performed to predict housing deflection in the thrust bearing area of a new extruder driveline was verified by testing of a prototype unit housing. Recently, housing structure stiffness and natural frequencies were predicted and verified on the test stand for some 50 MW vertically offset gear units. A complete data acquisition system is used to gather data from bearing, inlet and drain temperature monitoring points. The temperature monitoring system will accommodate type T,K,J, and E thermocouples and platinum and nickel RTDs.

Kane, J.

1995-06-01T23:59:59.000Z

425

High-speed pulse-shape generator, pulse multiplexer  

DOE Patents (OSTI)

The invention combines arbitrary amplitude high-speed pulses for precision pulse shaping for the National Ignition Facility (NIF). The circuitry combines arbitrary height pulses which are generated by replicating scaled versions of a trigger pulse and summing them delayed in time on a pulse line. The combined electrical pulses are connected to an electro-optic modulator which modulates a laser beam. The circuit can also be adapted to combine multiple channels of high speed data into a single train of electrical pulses which generates the optical pulses for very high speed optical communication. The invention has application in laser pulse shaping for inertial confinement fusion, in optical data links for computers, telecommunications, and in laser pulse shaping for atomic excitation studies. The invention can be used to effect at least a 10.times. increase in all fiber communication lines. It allows a greatly increased data transfer rate between high-performance computers. The invention is inexpensive enough to bring high-speed video and data services to homes through a super modem.

Burkhart, Scott C. (Livermore, CA)

2002-01-01T23:59:59.000Z

426

LM119/LM219/LM319 High Speed Dual Comparator  

E-Print Network (OSTI)

LM119/LM219/LM319 High Speed Dual Comparator General Description The LM119 series are precision higher gain and lower input currents than devices like the LM710. The uncommitted collector of the output stage makes the LM119 compatible with RTL, DTL and TTL as well as capable of driving lamps and relays

Lanterman, Aaron

427

Electric-Motor Control Gear : Starting, Protection and Speed  

Science Journals Connector (OSTI)

... THIS book is arranged in the form of notes on motors and control gear, and contains a lot of useful information in a small space. ... control gear are discussed briefly, graphical examples being given for squirrel-cage and slip-ring motors. A valuable feature is the inclusion of speed-torque characteristics of various types of ...

A. T. D.

1949-01-01T23:59:59.000Z

428

Elastic pathing: your speed is enough to track you  

Science Journals Connector (OSTI)

Today, people have the opportunity to opt-in to usage-based automotive insurances for reduced premiums by allowing companies to monitor their driving behavior. Several companies claim to measure only speed data to preserve privacy. With our elastic pathing ... Keywords: destination prediction, elastic pathing, location privacy, usage-based automotive insurance

Xianyi Gao, Bernhard Firner, Shridatt Sugrim, Victor Kaiser-Pendergrast, Yulong Yang, Janne Lindqvist

2014-09-01T23:59:59.000Z

429

New process speeds conversion of biomass to fuels  

E-Print Network (OSTI)

- 1 - New process speeds conversion of biomass to fuels February 7, 2013 Fuels synthesis insight forward recently towards transforming biomass-derived molecules into fuels. The team led by Los Alamos published the research. Trash to Treasure "Efficient conversion of non-food biomass into fuels and chemical

430

Improving the Accuracy and Speed of Support Vector Machines  

E-Print Network (OSTI)

Improving the Accuracy and Speed of Support Vector Machines Chris J.C. Burges Bell Laboratories bs@mpik-tueb.mpg.de Abstract Support Vector Learning Machines (SVM) are nding application in pattern to achieve a factor of fty speedup in test phase over the virtual support vector machine. The combined

431

Optimal Pitch, Speed and Fuel Control at Sea Thomas Hellstrom  

E-Print Network (OSTI)

largest item (after salaries) on a big vessel's budget. The fuel consumption for a large ferry ranges vessels. The fuel saving is achieved by optimizing control at three levels: low level propeller and main engine control, dy- namic speed control to avoid peeks in the fuel consumption and finally route planning

Hellström, Thomas

432

Modeling of a rotor speed transient response with radial rubbing  

E-Print Network (OSTI)

by an accidental blade­off imbalance. In order to assess the angular deceleration of the rotor due to rubbingModeling of a rotor speed transient response with radial rubbing Sébastien Roques1 Institut deGill Univer- sity, 817 Sherbrooke St West, Montreal, Quebec H3A 2K6, Canada Abstract A rotor­stator model

Boyer, Edmond

433

Ris-R-Report Comparison of NWP wind speeds and  

E-Print Network (OSTI)

for nuclear power plants, and for Risø, the site of the Danish nuclear research reactors now being Risø 5 German nuclear power plant sites 9 Brunsbüttel 9 Brokdorf 12 Krümmel 15 Obrigheim 18) of wind speed and direction has been compared to measurements for seven German sites for nuclear power

434

HIGH SPEED RAIL COSTS, BENEFITS, AND FINANCING RAYMOND H. ELLIS  

E-Print Network (OSTI)

Incremental Capital Cost Capital Cost Year of (Billions (Billions Completion Expenditure Section 2010$) 2010 YEAR OF EXPENDITURE CAPITAL DOLLARS CUMULATIVE YEAR OF EXPENDITURE CAPITAL COST INITIAL CONST$) of Section Capital Cost #12;CALIFORNIA HIGH SPEED RAIL PHASE 1 CAPITAL COSTS SECTION INCREMENTAL CAPITAL

Bustamante, Fabián E.

435

Electro-Tactile Display with Localized High-Speed Switching  

E-Print Network (OSTI)

-speed switching December 4-6, Tokyo, JAPAN ICAT 2002 #12;determined, and the type of stimulation, anodic stimulation or cathodic one, is selected. If the anodic stimulation is chosen, the upper switch which leads simultaneously uses only two electrodes: anode and cathode. These dipoles are scanned around the stimulation

Tachi, Susumu

436

High density Integrated Optoelectronic Circuits for High Speed Photonic Microsystems  

E-Print Network (OSTI)

High density Integrated Optoelectronic Circuits for High Speed Photonic Microsystems K. Minoglou.minoglou@imel.demorkitos.gr Abstract. The study of high density integrated optoelectronic circuits involves the development of hybrid integration technologies and the generation of models for the optoelectronic devices. To meet these goals

Kouroupetroglou, Georgios

437

Controlling the speed of Coding Line Conveyor using fuzzy logic  

Science Journals Connector (OSTI)

This paper presents performance improvement of a Coding Line Conveyer system (CLC), which is a key component of the automated parcels sorting complexes PP2000 used in logistics centers of Swiss Post. Normally, CLC operates with constant speed. The rules ... Keywords: control systems, fuzzy logic, parcels processing

Atanas Atanassov

2009-06-01T23:59:59.000Z

438

HANDBOOK FOR NEW Speeding up the Transition to Pitt  

E-Print Network (OSTI)

HANDBOOK FOR NEW FACULTY Speeding up the Transition to Pitt The Office of Research, Health Sciences task. This handbook has been designed to convey to you University expectations and requirements, to minimize any delay. These might include (i) the physical transfer of animals, lab equipment, or reagents

Jiang, Huiqiang

439

Ultrafast Digital Electronics: Optimizing the speed of a  

E-Print Network (OSTI)

Ultrafast Digital Electronics: Optimizing the speed of a Josephson junction J. K. Freericks and P, Georgetown University, Josephson Junction talk, 2000 #12;Josephson Tunnel Junctions · A Superconductor to "punch-through"). J. K. Freericks, Georgetown University, Josephson Junction talk, 2000 S I S I I V V Ic

Freericks, Jim

440

Sensor-bedazzled balloon catheter speeds up heart surgery  

E-Print Network (OSTI)

Sensor-bedazzled balloon catheter speeds up heart surgery By Janet Fang | Mar 7, 2011 | 0 Comments A little while ago, cardiologists improved open-heart surgery by using super thin, flexible balloon, says Rogers. Currently, heart surgeons map tissue using pointed catheters with electrodes, which

Rogers, John A.

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


441

On measurement of the isotropy of the speed of light  

Three experimental concepts investigating possible anisotropy of the speed of light are presented. They are based on i) beam deflection in a 180 degree magnetic arc, ii) narrow resonance production in an electron-positron collider, and iii) the ratio of magnetic moments of an electron and a positron moving in opposite directions.

Wojtsekhowski, Bogdan B. [JLAB

2014-11-01T23:59:59.000Z

442

Logic Synthesis with High Speed CMOS Circuit Techniques  

Science Journals Connector (OSTI)

Systems for automated logic synthesis with the True Single Phase Clocking circuit technique (TSPC) and a modified form of the Clock and Data Precharged Dynamic (CDPD) circuit technique, are presented. The CDPD system synthesizes high speed one clock ... Keywords: CMOS integrated circuits, logic synthesis

Johnny Pihl; Einar J. Aas

1997-01-01T23:59:59.000Z

443

Speed-dependent Automatic Zooming for Browsing Large Documents  

E-Print Network (OSTI)

@microsoft.com ABSTRACT We propose a navigation technique for browsing large documents that integrates rate. With typical scrolling interfaces, it is difficult to browse a large document efficiently. UsingSpeed-dependent Automatic Zooming for Browsing Large Documents Takeo Igarashi Computer Science

Igarashi, Takeo

444

Imaging of high-speed dust particle trajectories on NSTX  

SciTech Connect

Imaging of high-speed incandescent dust particle trajectories in a tokamak plasma has been accomplished on NSTX using up to three high-speed cameras each viewing the same plasma volume from different locations and operating at speeds up to 68 000 frames/s with exposure times varying from 2 to 300 {mu}s. The dynamics of the dust trajectories can be quite complex exhibiting a large variation in both speed (10-200 m/s) and direction. Simulations of these trajectories will be utilized to ascertain the role dust may play in future machines such as ITER where significant dust production from wall erosion is expected. NSTX has numerous view ports including both tangential as well as radial views in both the midplane and lower divertors. Several vertical ports are also available so that a few specific regions in NSTX may be viewed simultaneously from several different camera positions. The cameras can be operated in the full visible spectrum but near-infrared filters can be utilized to enhance the observation of incandescent particles against a bright background. A description of the cameras and required optics is presented.

Roquemore, A. L.; Davis, W.; Kaita, R.; Skinner, C. H.; Maqueda, R.; Nishino, N. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Nova Photonics, Inc., Princeton, New Jersey 08540 (United States); Hiroshima University, Hiroshima 739-8527 (Japan)

2006-10-15T23:59:59.000Z

445

ADAPTIVE IIR FILTERING: CONVERGENCE SPEED PROPERTIES IN THE UNDERMODELLED CASE  

E-Print Network (OSTI)

high order, possi- bly infinite (meaning its transfer function is not ratio- nal). It is also true for sufficient order can be applied with any confidence. In other words, does the existence of a good and concerning the local convergence speed of adap- tive IIR filters apply to the sufficient order case

Regalia, Phillip A.

446

3D Laser Imaging at Highway Speed Kelvin CP Wang  

E-Print Network (OSTI)

3D Laser Imaging at Highway Speed Kelvin CP Wang And the Team Formerly at the University Concrete Consortium Meeting Oklahoma City Sheraton Hotel #12;3D Laser Imaging for Pavements Mature Potential to Cover Most if Not All Data Collection on Pavement Surface How to Obtain True 1mm 3D Visual

447

The Influence of Wind Speed on Shallow Marine Cumulus Convection  

Science Journals Connector (OSTI)

The role of wind speed on shallow marine cumulus convection is explored using large-eddy simulations and concepts from bulk theory. Focusing on cases characteristic of the trades, the equilibrium trade wind layer is found to be deeper at stronger ...

Louise Nuijens; Bjorn Stevens

2012-01-01T23:59:59.000Z

448

Sampling Wind Data for Mean Wind Speed Estimation  

Science Journals Connector (OSTI)

Two sampling techniques are applied to wind data at 3 h intervals for six stations in the Great Plains region in the United States in order to investigate the reduction in the number of data needed to estimate the mean wind speed. One-in-k ...

Mark Jong; Gary Thomann

1981-03-01T23:59:59.000Z

449

Response of a vessel to waves at zero ship speed  

E-Print Network (OSTI)

Response of a vessel to waves at zero ship speed: preliminary full scale experiments By: Kim Klaka of experiment were conducted ­ free roll decay tests and irregular wave tests. An inclining test was also with and without the mainsail hoisted, in very light winds. The irregular wave tests were conducted again in very

450

Minimize Adverse Motor and Adjustable Speed Drive Interactions  

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

Electronic adjustable speed drives (ASDs) are extremely efficient and valuable assets to motor systems. They allow precise process control and provide energy savings within systems that do not need to operate continuously at full output. This tip sheet discusses design considerations to take into account when considering ASDs and offers suggested actions.

451

Calculator program optimizes bit weight, rotary speed, reducing drilling cost  

SciTech Connect

Bit selection, bit weight, and rotary speed have repeatedly proven to be the most important and commonly overlooked alterable factors which control penetration rate, footage, and overall drilling cost. This is particularly true in offshore operations where drilling costs are highest and the greatest cost savings stand to be achieved through implementation of proven optimization techniques. The myth that bit weights and rotary speeds cannot be optimized in directional holes has hindered the industry from using this virtually cost-free method for reducing drilling cost. The use of optimized bit weights and rotary speeds in conjunction with minimum cost bit programs based on cost per foot analysis of previous bit runs in the area was implemented on a five-well platform in the Grand Isle Block 20 field, offshore Louisiana. Each of the directional wells was drilled substantially faster and cheaper than the discovery well, which was a straight hole. Average reductions in footage cost of 31.3%, based on daily operating cost of $30,000/day, and increase in average daily footage drilled of 45.2% were effected by ''collectively optimizing'' drilling performance. The ''Optimizer'' program is an HP-41CV adaptation of the Bourgoyne and Young drilling model. It was used to calculate the optimum bit weights and rotary speeds based on field drilling tests; historical bit and bearing wear data; and current operating conditions, cost, and constraints.

Simpson, M.A.

1984-04-23T23:59:59.000Z

452

High-Speed Parameter Estimation Algorithms For Nonlinear Smart Materials  

E-Print Network (OSTI)

High-Speed Parameter Estimation Algorithms For Nonlinear Smart Materials Jon M. Ernstberger with experimental data. 1. INTRODUCTION Smart materials exhibit unique actuator and sensor capabilities for a range of aerospace, aeronautic, indus- trial and DoD applications. Applications of smart materials include

453

Cool Pions move at less than the speed of light  

E-Print Network (OSTI)

At nonzero temperature, pions propagate through a thermal medium at less than the speed of light. About low temperature, this effect begins not at $\\sim T^2$, but at next to leading order, $\\sim T^4$. We also derive the generalization of the relation of Gell-Mann, Oakes, and Renner to nonzero temperature.

Robert D. Pisarski; Michel Tytgat

1996-06-27T23:59:59.000Z

454

One-Way Speed of Light Measurements Without Clock Synchronisation  

E-Print Network (OSTI)

The 1991 DeWitte double one-way 1st order in v/c experiment successfully measured the anisotropy of the speed of light using clocks at each end of the RF coaxial cables. However Spavieri et al., Physics Letters A (2012), doi: 10.1016/j.physleta_2012.0010, have reported that (i) clock effects caused by clock transport should be included, and (ii) that this additional effect cancels the one-way light speed timing effect, implying that one-way light speed experiments "do not actually lead to the measurement of the one-way speed of light or determination of the absolute velocity of the preferred frame". Here we explain that the Spavieri et al. derivation makes an assumption that is not always valid: that the propagation is subject to the usual Fresnel drag effect, which is not the case for RF coaxial cables. As well DeWitte did take account of the clock transport effect. The Spavieri et al. paper has prompted this clarification of these issues.

Reginald T. Cahill

2012-06-04T23:59:59.000Z

455

On measurement of the isotropy of the speed of light  

E-Print Network (OSTI)

Three experimental concepts investigating possible anisotropy of the speed of light are presented. They are based on i) beam deflection in a 180 degree magnetic arc, ii) narrow resonance production in an electron-positron collider, and iii) the ratio of magnetic moments of an electron and a positron moving in opposite directions.

Wojtsekhowski, B

2014-01-01T23:59:59.000Z

456

SPEED LIGHTING TECHNOLOGY SHOWCASE AT UC SANTA BARBARA  

E-Print Network (OSTI)

SPEED LIGHTING TECHNOLOGY SHOWCASE AT UC SANTA BARBARA 12th Annual California Higher EducationMar Lighting & FSC Lighting · Parking Lot 10 NETWORKED PATHWAY LED Lumec EcoSwap with Lumewave Controls.ORG WESTERN COOLING EFFICIENCY CENTER ROADWAY LIGHTING Cree Edge (Initial Installation) · Lagoon Road #12

California at Davis, University of

457

On measurement of the isotropy of the speed of light  

E-Print Network (OSTI)

Three experimental concepts investigating possible anisotropy of the speed of light are presented. They are based on i) beam deflection in a 180 degree magnetic arc, ii) narrow resonance production in an electron-positron collider, and iii) the ratio of magnetic moments of an electron and a positron moving in opposite directions.

B. Wojtsekhowski

2014-09-22T23:59:59.000Z

458

Short term wind speed estimation in Saudi Arabia  

Science Journals Connector (OSTI)

Abstract In this paper, three methods are used for the prediction of wind speed, 12 h ahead, based on 72 h previous wind speed values at three locations viz. Rawdat Bin Habbas (inland north), Juaymah (east coast), and Dhulom (inland western region) in Saudi Arabia. These methods are Particle Swarm Optimization (PSO), Abductory Induction Mechanism (AIM), and the Persistence (PER) model. The available data at each site was divided into three consecutive groups. The first 50% was used for training, the second 25% for validation, and the remaining 25% for testing. The validation data set was used to select the network architecture and other user defined parameters. The testing data was used only to assess the performance of the networks on future unseen data that has not been used for training or model selection. For each of the three methods, each of 12 networks was trained to produce the wind speed at one of the next 12 h. Relatively, Close agreements were found between the predicted and measured hourly mean wind speed for all three locations with coefficient of correlation R2 values between 81.7% and 98.0% for PSO, between 79.8% and 98.5% for AIM and between 59.5% and 88.4% for persistence model. Both PSO and AIM methods underestimated WS values during most hours with an average value of 0.036 m/s and 0.02 m/s, respectively. However, persistence model overestimated the WS by an average value of 0.51 m/s. It is shown that the two developed models outperformed the persistence model on predicting wind speed 12 h ahead of time with slight advantage to the PSO method.

Mohamed Ahmed Mohandes; Shafiqur Rehman

2014-01-01T23:59:59.000Z

459

Operating Reserves and Variable Generation  

SciTech Connect

This report tries to first generalize the requirements of the power system as it relates to the needs of operating reserves. It also includes a survey of operating reserves and how they are managed internationally in system operations today and then how new studies and research are proposing they may be managed in the future with higher penetrations of variable generation.

Ela, E.; Milligan, M.; Kirby, B.

2011-08-01T23:59:59.000Z

460

Cosmological models with variable constants  

E-Print Network (OSTI)

The behavior of the constants, G,c,h,a,e,m and Lambda, considering them as variable, in the framework of a flat cosmological model with FRW symmetries described by a bulk viscous fluid and considering mechanisms of adiabatic matter creation are investigated. Within two models; one with radiation predominance and another of matter predominance, this behavior are studied.

J. A. Belinchon

1999-07-01T23:59:59.000Z

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


461

Design of a variable reluctance asymmetric stepping millimotor  

SciTech Connect

This paper reports on the design, simulation, and preliminary testing of a three phase variable reluctance stepping motor. This motor is pancake-shaped with an overall outside diameter of 8 mm and a height of 3 mm. The outside diameter of the rotor is 4.7 mm. The rotor and stators occupy 2 mm of the height with the remaining 1 mm reserved for a 6:1 planetary gear reductor. The rotor and stators were constructed of Hyperco 50 using conventional miniature machining. The reductor was assembled using copper and PMMA (polymethylmethacrylate) components that were constructed using the LIGA (Lithographic Galvanoformung Abformung) microfabrication process. The maximum measured stall torque of the motor without the reductor is 0.47mNm at 4W and the maximum speed is 2,400 rpm.

GARCIA,ERNEST J.; GREENWOOD,WILLIAM H.; OLIVER,ANDREW D.

2000-06-01T23:59:59.000Z

462

Alternative Fuels Data Center: Low-Speed Vehicle Roadway Access Study  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Roadway Access Study to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Roadway Access Study on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Roadway Access Study on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Roadway Access Study on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Roadway Access Study on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Roadway Access Study on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Roadway Access Study on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Vehicle Roadway Access Study A committee composed of members of the New Hampshire Legislature must study

463

Alternative Fuels Data Center: Low-Speed Electric Vehicle Access to  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Electric Low-Speed Electric Vehicle Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Electric Vehicle Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Electric Vehicle Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Electric Vehicle Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Electric Vehicle Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Electric Vehicle Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Electric Vehicle Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Low-Speed Electric Vehicle Access to Roadways

464

Variable trim compressor – a new approach to variable compressor geometry  

Science Journals Connector (OSTI)

ABSTRACT Variable compressor geometry can be employed irrespective of the combustion process selected. It provides the capability of improving response behavior, reducing fuel consumption or cutting exhaust emissions from exhaust-gas turbocharged engines. Previous concepts on variable compressor geometries have been based on using inlet guide vanes to impart a swirl motion to the air that is fed to the compressor with the ultimate aim of enhancing the angle at which the flow of air enters the blade channel. This paper shows an inlet guide configuration that is based on a different operating principle. The inlet guide assembly shown here is designed in a way that minimizes any pressure losses even at high flow rates. Numerical studies were carried out using CFD to test the system's sensitivity. Based on these studies, a rigid conical element was then produced and the potential for increasing efficiency (up to 7% points) and shifting the surge line (up to 33%) verified on a turbocharger test bench. Finally, a design configuration is presented for a variable system.

P. Grigoriadis; S. Müller; A. Benz; M. Sens

2012-01-01T23:59:59.000Z

465

Sensible and Latent Cooling Load Control Using Centrally-Ducted, Variable-Capacity Space Conditioning Systems in Low Sensible Load Environments  

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

Sensible and Latent Cooling Load Control Using Centrally-Ducted, Variable-Capacity Space Conditioning Systems in Low Sensible Load Environments James Cummings BA-PIRC; Florida Solar Energy Center Presented at BA Summer Meeting, July 26, 2012 The gist of my message * Fixed capacity AC systems generally provide good RH control in typical residences. * In low-load homes, they may be less effective in achieving good RH control. * On the other hand, variable capacity AC systems have several characteristics which can provide improved RH control in homes. - Both Nordyne and Carrier have variable capacity units, varying from about 40% to 100% of nominal full capacity. - What is variable capacity? -- condenser fan, compressor speed, and AHU fan speed. The gist, continued

466

Anemometer Data (Wind Speed, Direction) for Ugashik, AK (2001 - 2002) |  

Open Energy Info (EERE)

0 0 Varnish cache server Browse Upload data GDR 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load) Guru Meditation: XID: 2142278290 Varnish cache server Anemometer Data (Wind Speed, Direction) for Ugashik, AK (2001 - 2002) Dataset Summary Description Wind data collected from Ugashik Traditional Village in Alaska from an anemometer as part of the Native American anemometer loan program. Monthly mean wind speed is available for 2001 through 2002, as is wind direction and turbulence data. Data is reported from a height of 20 m. The data was originally made available by Wind Powering America, a DOE Office of Energy Efficiency & Renewable Energy (EERE) program. A dynamic map displaying all available data from DOE anemometer loan programs is available http://www.windpoweringamerica.gov/anemometerloans/projects.asp.

467

Anemometer Data (Wind Speed, Direction) for Tanana, AK (2001 - 2002) |  

Open Energy Info (EERE)

40 40 Varnish cache server Anemometer Data (Wind Speed, Direction) for Tanana, AK (2001 - 2002) Dataset Summary Description Wind data collected from Tanana Village in Alaska from an anemometer as part of the Native American anemometer loan program. Monthly mean wind speed is available for 2001 through 2002, as is wind direction and turbulence data. Data is reported from a height of 20 m. The data was originally made available by Wind Powering America, a DOE Office of Energy Efficiency & Renewable Energy (EERE) program. A dynamic map displaying all available data from DOE anemometer loan programs is available http://www.windpoweringamerica.gov/anemometerloans/projects.asp. Source EERE Date Released November 09th, 2010 (4 years ago) Date Updated November 09th, 2010 (4 years ago)

468

Fabrication of High-Speed Resonant Cavity Enhanced Schottky Photodiodes  

E-Print Network (OSTI)

Abstract — We report the fabrication and testing of a GaAsbased high-speed resonant cavity enhanced (RCE) Schottky photodiode. The top-illuminated RCE detector is constructed by integrating a Schottky contact, a thin absorption region (InHXHVGaHXWPAs) and a distributed AlAs–GaAs Bragg mirror. The Schottky contact metal serves as a high-reflectivity top mirror in the RCE detector structure. The devices were fabricated by using a microwave-compatible fabrication process. The resulting spectral photo response had a resonance around 895 nm, in good agreement with our simulations. The full-widthat-half-maximum (FWHM) was 15 nm, and the enhancement factor was in excess of 6. The photodiode had an experimental setup limited temporal response of 18 ps FWHM, corresponding to a 3-dB bandwidth of 20 GHz. Index Terms—High-speed circuits/devices, photodetectors, photodiodes, resonant caity enhancement, Schottky diodes.

Ekmel Özbay; M. Saiful Islam; Bora Onat; Student Member; Mutlu Gökkavas; Orhan Aytür; Gary Tuttle; Elias Towe; R. H. Henderson; M. Selim Ünlü; Senior Member

469

High-speed digital holographic interferometry for vibration measurement  

SciTech Connect

A system based on digital holographic interferometry for the measurement of vibrations is presented. A high-power continuous laser(10 W) and a high-speed CCD camera are used. Hundreds of holograms of an object that has been subjected to dynamic deformation are recorded. The acquisition speed and the time of exposure of the detector are determined by the vibration frequency. Two methods are presented for triggering the camera in order to acquire at a given phase of the vibration. The phase of the wavefront is calculated from the recorded holograms by use of a two-dimensional digital Fourier-transform method. The deformation of the object is obtained from the phase. By combination of the deformations recorded at different times it is possible to reconstruct the vibration of the object.

Pedrini, Giancarlo; Osten, Wolfgang; Gusev, Mikhail E

2006-05-20T23:59:59.000Z

470

High-speed, sub-pull-in voltage MEMS switching.  

SciTech Connect

We have proposed and demonstrated MEMS switching devices that take advantage of the dynamic behavior of the MEMS devices to provide lower voltage actuation and higher switching speeds. We have explored the theory behind these switching techniques and have demonstrated these techniques in a range of devices including MEMS micromirror devices and in-plane parallel plate MEMS switches. In both devices we have demonstrated switching speeds under one microsecond which has essentially been a firm limit in MEMS switching. We also developed low-loss silicon waveguide technology and the ability to incorporate high-permittivity dielectric materials with MEMS. The successful development of these technologies have generated a number of new projects and have increased both the MEMS switching and optics capabilities of Sandia National Laboratories.

Spahn, Olga Blum; Brewer, Steven; Olsson, Roy H.; Bogart, Gregory R.; Luck, David L.; Watts, Michael R.; Shaw, Michael J.; Nielson, Gregory N.; Resnick, Paul James; Tigges, Christopher P.; Grossetete, Grant David

2008-01-01T23:59:59.000Z

471

Anemometer Data (Wind Speed, Direction) for Laurel, Nebraska (2001 - 2002)  

Open Energy Info (EERE)

Laurel, Nebraska (2001 - 2002) Laurel, Nebraska (2001 - 2002) Dataset Summary Description Wind data collected from Laurel, Nebraska from a 20-meter anemometer as part of the Western Area Power Administration anemometer loan program. Ten-minute average wind speed and direction is available for 2001 - 2002. The data was originally made available by Wind Powering America, a DOE Office of Energy Efficiency & Renewable Energy (EERE) program. A dynamic map displaying all available data from DOE anemometer loan programs is available http://www.windpoweringamerica.gov/anemometerloans/projects.asp. Source EERE Date Released November 09th, 2010 (4 years ago) Date Updated November 09th, 2010 (4 years ago) Keywords wind wind direction wind speed Data text/csv icon Jun 11, 2001 - Jul 1, 2001 (csv, 144 KiB)

472

Evidence for an anisotropy of the speed of light  

E-Print Network (OSTI)

By comparing with the most recent experimental results, we point out the model dependence of the present bounds on the anisotropy of the speed of light. In fact, by replacing the CMB with a class of preferred frames that can better account for the experimental data, one obtains values of the RMS anisotropy parameter (1/2 -beta + delta) that are one order of magnitude larger than the presently quoted ones. The resulting non-zero anisotropy can be understood starting from the observation that the speed of light in the Earth's gravitational field is not the basic parameter c=1 entering Lorentz transformations. In this sense, light can propagate isotropically only in one `preferred' frame.

C. M. L. de Aragao; M. Consoli; A. Grillo

2005-09-16T23:59:59.000Z

473

The Speed of Light and the Fine Structure Constant  

E-Print Network (OSTI)

The fine structure constant $\\alpha $ includes the speed of light as given by $\\alpha =\\frac{e^{2}}{4\\pi \\epsilon_{0}c\\hbar}$. It is shown here that, following a $TH\\epsilon \\mu $ formalism, interpreting the permittivity $\\epsilon_{0}$ and permeabiliy $\\mu_{0}$ of free space under Lorentz local and position invariance, this is not the case. The result is a new expression as $\\alpha =\\frac{e^{2}}{4\\pi \\hbar}$ in a new system of units for the charge that preserves local and position invariance. Hence, the speed of light does not explicitly enter in the constitution of the fine structure constant. The new expressions for the Maxwell's equations are derived and some cosmological implications discussed.

Antonio Alfonso-Faus

2000-08-04T23:59:59.000Z

474

Self-synchronizing scheme for high speed computational ghost imaging  

E-Print Network (OSTI)

Computational ghost imaging needs to acquire a large number of correlated measurements between reference patterns and the scene for reconstruction, so extremely high acquisition speed is crucial for fast ghost imaging. With the development of technologies, high frequency illumination and detectors are both available, but their synchronization needs technique demanding customization and lacks flexibility for different setup configurations. This letter proposes a self-synchronization scheme that can eliminate this difficulty by introducing a high precision synchronization technique and corresponding algorithm. We physically implement the proposed scheme using a 20kHz spatial light modulator to generate random binary patterns together with a 100 times faster photodiode for high speed ghost imaging, and the acquisition frequency is around 14 times faster than that of state-of-the-arts.

Suo, Jinli; Bian, Liheng; Zhang, Lei; Dai, Qionghai

2014-01-01T23:59:59.000Z

475

Neutron Stars in a Varying Speed of Light Theory  

E-Print Network (OSTI)

We study neutron stars in a varying speed of light (VSL) theory of gravity in which the local speed of light depends upon the value of a scalar field $\\phi$. We find that the masses and radii of the stars are strongly dependent on the strength of the coupling between $\\phi$ and the matter field and that for certain choices of coupling parameters, the maximum neutron star mass can be arbitrarily small. We also discuss the phenomenon of cosmological evolution of VSL stars (analogous to the gravitational evolution in scalar-tensor theories) and we derive a relation showing how the fractional change in the energy of a star is related to the change in the cosmological value of the scalar field.

A. W. Whinnett

2003-04-04T23:59:59.000Z

476

Massive Variability Surveys from Venezuela  

E-Print Network (OSTI)

At the Venezuela National Astronomical Observatory we are carrying out variability surveys spanning many hundreds of square degrees near the celestial equator, using an 8k x 8k CCD Mosaic Camera optimized for drift-scanning on a 1m Schmidt telescope. Among the initial efforts was a project to obtain the first moderately deep, homogeneous sample of young stars over an area of ~180sqr.deg. encompassing the entire Orion OB1 association, one of the nearest and most active regions of star formation. The results show that variability is a powerful technique to identify pre-main sequence populations, specially in sparse areas devoid of gas and dust. We are currently developing a massive database, equipped with web-based data mining tools, that will make our data and results available to the astronomical community.

Cesar Briceno

2003-04-03T23:59:59.000Z

477

Variable frequency microwave heating apparatus  

DOE Patents (OSTI)

A variable frequency microwave heating apparatus (10) designed to allow modulation of the frequency of the microwaves introduced into a multi-mode microwave cavity (34) for testing or other selected applications. The variable frequency microwave heating apparatus (10) includes a microwave signal generator (12) and a high-power microwave amplifier (20) or a high-power microwave oscillator (14). A power supply (22) is provided for operation of the high-power microwave oscillator (14) or microwave amplifier (20). A directional coupler (24) is provided for detecting the direction and amplitude of signals incident upon and reflected from the microwave cavity (34). A first power meter (30) is provided for measuring the power delivered to the microwave furnace (32). A second power meter (26) detects the magnitude of reflected power. Reflected power is dissipated in the reflected power load (28).

Bible, Don W. (Clinton, TN); Lauf, Robert J. (Oak Ridge, TN); Johnson, Arvid C. (Lake in the Hills, IL); Thigpen, Larry T. (Angier, NC)

1999-01-01T23:59:59.000Z

478

A finite element method for low-speed compressible flows.  

SciTech Connect

The derivation and justification for various low-speed approximations to the fully compressible, Navier-Stokes equations are presented. A numerical formulation based on the finite element method is developed and implemented as an extension to the standard Boussinesq equations. Example steady and transient flow problems are simulated to examine the performance of the numerical algorithm and the solution differences with the more commonly studied Boussinesq approximation.

Martinez, Mario J.; Gartling, David K.

2003-04-01T23:59:59.000Z

479

Extended cage adjustable speed electric motors and drive packages  

DOE Patents (OSTI)

The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced. 12 figs.

Hsu, J.S.

1999-03-23T23:59:59.000Z

480

VHISPER: a high speed dual mode VLIW and Superscalar Processor  

E-Print Network (OSTI)

, increases the clock speed and lowers the CPI. The processors representative of the RISC design are the Sun SPARC, Intel i860, Motorola M88100, and AMD 29000. All of these processors use 32-bit instructions. The instruction sets of these machines consist... of 51 to 124 basic instructions. Each of these processors issue one instruction per cycle. The Sun SPARC design is derived from the original Berkeley RISC design. SPARC stands for scalable processor archi- tecture. The scalability of the SPARC refers...

Mellacheruvu, Rajesh Kumar

1994-01-01T23:59:59.000Z

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


481

Speed Meter As a Quantum Nondemolition Measuring Device for Force  

E-Print Network (OSTI)

Quantum noise is an important issue for advanced LIGO. Although it is in principle possible to beat the Standard Quantum Limit (SQL), no practical recipe has been found yet. This paper dicusses quantum noise in the context of speedmeter-a devise monitoring the speed of the testmass. The scheme proposed to overcome SQL in this case might be more practical than the methods based on monitoring position of the testmass.

F. Ya. Khalili; Yu. Levin

1996-03-26T23:59:59.000Z

482

Sound speed and thermophysical properties of liquid iron and nickel  

Science Journals Connector (OSTI)

An electrical-pulse-heating technique has been used to heat iron and nickel to high temperatures to measure thermophysical properties in the liquid state. A dynamic technique was used because static techniques, which are capable of greater precision, fail at a relatively low temperature. Measurements have been made, and results are shown for enthalpy, temperature, density, electrical resistivity, and sound speed up to 3950 K in iron and 4250 K in nickel.

R. S. Hixson; M. A. Winkler; M. L. Hodgdon

1990-10-01T23:59:59.000Z

483

Low speed engine for supersonic and hypersonic vehicles  

SciTech Connect

This patent describes a jet engine suitable for use in an aircraft in a range of speeds from zero to hypersonic flight. It comprises: a duct having a relatively small diameter mixing zone and a relatively large diameter combustion zone located down stream from the mixing zone; a secondary injector positioned between the primary injector and the combustion zone, supply means for supplying a fuel rich injectant to the primary injector so that the primary injector forces the injectant into the duct.

Klees, G.W.; Sloan, M.L.; Thornock, R.L.

1992-07-14T23:59:59.000Z

484

Gearbox Reliability Collaborative High-Speed Shaft Calibration  

SciTech Connect

Instrumentation has been added to the high-speed shaft, pinion, and tapered roller bearing pair of the Gearbox Reliability Collaborative gearbox to measure loads and temperatures. The new shaft bending moment and torque instrumentation was calibrated and the purpose of this document is to describe this calibration process and results, such that the raw shaft bending and torque signals can be converted to the proper engineering units and coordinate system reference for comparison to design loads and simulation model predictions.

Keller, J.; McNiff, B.

2014-09-01T23:59:59.000Z

485

New medium-speed engine combines best of two worlds  

SciTech Connect

This article is concerned with the released details of a new, jointly-developed, medium-speed diesel engine designed to provide the best for two worlds - long service in severe North American locomotive applications, as well as in stationary and marine applications worldwide while meeting all current and known future emissions regulations both in Europe and United States. The diesel engine is elegant for its simplicity, and notable for its compact size, light weight and excellent fuel efficiency. 4 figs., 1 tab.

Johnson, P.; Walker, J.

1994-12-01T23:59:59.000Z

486

Relationships between access and operating speed on suburban arterials  

E-Print Network (OSTI)

III STUDY DESIGN 12 Site Selection. Data Collection Site Characteristics Speed Data. Data Reduction 12 . 14 15 23 . . . . . 25 CHAPTER IV ANALYSIS AND FINDINGS. 30 Selection of Location for Evaluation. . Descriptive Statistics . 30 34... Page Figure 1. Distribution of Study Sites. 14 Figure 2. Determination of Study Tangent Length. . . . 20 Figure 3. Example of Laser Gun. . 23 Figure 4. Example of Technician Placement in the Field (from back side). . . Figure 5. Example...

Brewer, Marcus Allen

2012-06-07T23:59:59.000Z

487

Multiprocessor Speed Scaling for Jobs with Arbitrary Sizes and Deadlines  

E-Print Network (OSTI)

energy, yet it takes longer to finish the job. The study of speed scaling was initiated by Yao et al. [6 online and the aim is to finish all jobs by their deadlines using the minimum amount of energy. They gave energy to run each job of J independently of other jobs, i.e., MIN(J ) = JJ ((J))span(J); and AVR

Wong, Prudence W.H.

488

Quantum cosmology with varying speed of light and Bohmian trajectories  

E-Print Network (OSTI)

The classical trajectories for FLRW universe with varying speed of light are obtained for the cases in which the cosmological constant depends or not depend on the velocity of light. The theory is then quantized and the corresponding WDW equation is solved. It is shown that the method of causal interpretation of Bohm can be applied successfully to the theory. Finally the Bohmian trajectories are obtained and compared with the classical ones.

F. Shojai; S. Molladavoudi

2007-08-04T23:59:59.000Z

489

Review of Probability Random Variable  

E-Print Network (OSTI)

at close 4) Height of wheel going over a rocky road #12;3 Random Variable Non-examples 1) `Heads' or `Tails' on coin 2) Red or Black ball from urn But we can make these into RV's Basic Idea ­ don't know · Temperature · Wheel height #12;5 Given Continuous RV X... What is the probability that X = x0 ? Oddity : P

Fowler, Mark

490

Turbulent flame speed for syngas at gas turbine relevant conditions  

Science Journals Connector (OSTI)

Modifications of conventional natural-gas-fired burners for operation with syngas fuels using lean premixed combustion is challenging due to the different physicochemical properties of the two fuels. A key differentiating parameter is the turbulent flame velocity, ST, commonly expressed as its ratio to the laminar flame speed, SL. This paper reports an experimental investigation of premixed syngas combustion at gas turbine like conditions, with emphasis on the determination of ST/SL derived as global fuel consumption per unit time. Experiments at pressures up to 2.0 MPa, inlet temperatures and velocities up to 773 K and 150 m/s, respectively, and turbulence intensity to laminar flame speed ratios, u?/SL, exceeding 100 are presented for the first time. Comparisons between different syngas mixtures and methane clearly show much higher ST/SL for the former fuel. It is shown that ST/SL is strongly dependent on preferential diffusive-thermal (PDT) effects, co-acting with hydrodynamic effects, even for very high u?/SL. ST/SL increases with rising hydrogen content in the fuel mixture and with increasing pressure. A correlation for ST/SL valid for all investigated fuel mixtures, including methane, is proposed in terms of turbulence properties (turbulence intensity and integral length scale), combustion properties (laminar flame speed and laminar flame thickness) and operating conditions (pressure and inlet temperature). The correlation captures effects of preferential diffusive-thermal and hydrodynamic instabilities.

S. Daniele; P. Jansohn; J. Mantzaras; K. Boulouchos

2011-01-01T23:59:59.000Z

491

Lube oil for medium-speed, heavy-fuel engines  

SciTech Connect

A new generation of trunk-piston engine lube oils has been introduced by Chevron International Marine Lubricants for medium-speed, heavy-fuel, four-stroke engines. The new Chevron Delo 1000, 2000, 3000, and 3400 marine lubricants are specially designed for the demands of medium-speed diesel engines in today`s marine and stationary power markets. The new lube oil has been formulated to provide high levels of engine cleanliness, with low levels of wear. Testing by Chevron engineers shows that the new oils prevent the buildup of black sludge, a sticky, viscous deposit that can accumulate on the surfaces of medium-speed engines that run on heavy residual fuel. The performance of the new lube oils has been thoroughly evaluated by Chevron in a number of ongoing field tests. Results from 5000 hour teardown of a 6600 kW, model 6 MaK 601C engine in the cargo ship MV Germania serve as a good example of the field testing. 3 figs.

NONE

1995-09-01T23:59:59.000Z

492

Stall inception measurements in a high-speed multistage compressor  

SciTech Connect

This paper presents unsteady measurements taken in a high-speed four-stage aeroengine compressor prior to the onset of aerodynamic flow instabilities. In this experiment, 40 fast-response pressure transducers have been located at various axial and circumferential positions throughout the machine in order to give a very detailed picture of stall inception. At all the compressor speeds investigated, the stall pattern observed is initiated by a very short length-scale finite-amplitude disturbance, which propagates at a fast rate around the annulus. This initial stall cell leads to a large-amplitude system instability in less than five rotor revolutions. Varying the IGV setting angle is found to have a strong influence on the axial location of the first disturbance detected. In particular, transferring the aerodynamic loading from front to down-stream stages moves the first disturbance detected from the first to the last stage of the compressor. Other repeatable features of the stall inception pattern in this compressor have been identified using a simple analysis technique particularly appropriate to the study of short length-scale disturbances. It is found that the origins of instabilities are tied to particular tangential positions in both the stationary and rotating frames of reference. These measurements lead to the conclusion that the stall inception process in high-speed multistage compressors can be characterized by some very local and organized flow phenomena. Moreover, there is no evidence of prestall waves in this compressor.

Escuret, J.F.; Garnier, V. [SNECMA, Moissy-Cramayel (France). Compressor Aerodynamics Dept.

1996-10-01T23:59:59.000Z

493

High-speed Flight in an Ergodic Forest  

E-Print Network (OSTI)

Inspired by birds flying through cluttered environments such as dense forests, this paper studies the theoretical foundations of a novel motion planning problem: high-speed navigation through a randomly-generated obstacle field when only the statistics of the obstacle generating process are known a priori. Resembling a planar forest environment, the obstacle generating process is assumed to determine the locations and sizes of disk-shaped obstacles. When this process is ergodic, and under mild technical conditions on the dynamics of the bird, it is shown that the existence of an infinite collision-free trajectory through the forest exhibits a phase transition. On one hand, if the bird flies faster than a certain critical speed, then, with probability one, there is no infinite collision-free trajectory, i.e., the bird will eventually collide with some tree, almost surely, regardless of the planning algorithm governing the bird's motion. On the other hand, if the bird flies slower than this critical speed, then...

Karaman, Sertac

2012-01-01T23:59:59.000Z

494

LIDAR Wind Speed Measurements of Evolving Wind Fields  

SciTech Connect

Light Detection and Ranging (LIDAR) systems are able to measure the speed of incoming wind before it interacts with a wind turbine rotor. These preview wind measurements can be used in feedforward control systems designed to reduce turbine loads. However, the degree to which such preview-based control techniques can reduce loads by reacting to turbulence depends on how accurately the incoming wind field can be measured. Past studies have assumed Taylor's frozen turbulence hypothesis, which implies that turbulence remains unchanged as it advects downwind at the mean wind speed. With Taylor's hypothesis applied, the only source of wind speed measurement error is distortion caused by the LIDAR. This study introduces wind evolution, characterized by the longitudinal coherence of the wind, to LIDAR measurement simulations to create a more realistic measurement model. A simple model of wind evolution is applied to a frozen wind field used in previous studies to investigate the effects of varying the intensity of wind evolution. LIDAR measurements are also evaluated with a large eddy simulation of a stable boundary layer provided by the National Center for Atmospheric Research. Simulation results show the combined effects of LIDAR errors and wind evolution for realistic turbine-mounted LIDAR measurement scenarios.

Simley, E.; Pao, L. Y.

2012-07-01T23:59:59.000Z

495

Micro Mirrors for High-speed Laser Deflection and Patterning  

Science Journals Connector (OSTI)

Abstract This paper focuses on high-speed optical MEMS Scanners and Micro Mirror Arrays. Devices supporting spot/pixel rateshigher than 10 Mpixel/s are considered and discussed regarding limits and possibilities to further improve speed and optical properties. Several variants of both types, developed by our group, are presented. Scanning Micro Mirrors with frequencies up to 100 kHz enable spot rates of up to 130 Mpixels / s at 650 nm. Bragg-coatings enable high power applications up to 20 W (beam ř2 mm). Challenges like static and dynamic mirror planariy are discussed. A 29-kHz-scanner for laser projection serves as application example. Highly parallel operated Micro Mirror Arrays extend pattern speed to 10 Gpixel / s including analog grey scaling. Irradiation tests prove stable operation of the mirrors at DUV. Prospects regarding optical planarity and high reflective coatings are discussed. By means of two examples, laser patterning of semiconductor masks and laser patterning of Printed Circuit Boards, properties of the spatial light modulators are presented. The two device classes are compared regarding spot/pixel rate and frequency. The comparison includes representative MEMS device examples from literature.

Harald Schenk; Jan Grahmann; Thilo Sandner; Michael Wagner; Ulrike Dauderstädt; Jan-Uwe Schmidt

2014-01-01T23:59:59.000Z

496

Speed of Light in Non--Trivial Vacua  

E-Print Network (OSTI)

We unify all existing results on the change of the speed of low--energy photons due to modifications of the vacuum, finding that it is given by a universal constant times the quotient of the difference of energy densities between the usual and modified vacua over the mass of the electron to the fourth power. Whether photons move faster or slower than $c$ depends only on the lower or higher energy density of the modified vacuum, respectively. Physically, a higher energy density is characterized by the presence of additional particles (real or virtual) in the vacuum whereas a lower one stems from the absence of some virtual modes. We then carry out a systematic study of the speed of propagation of massless particles for several field theories up to two loops on a thermal vacuum. Only low--energy massless particles corresponding to a massive theory show genuine modifications of their speed while remaining massless. All other modifications are mass-related, or running mass-related. We also develop a formalism for the Casimir vacuum which parallels the thermal one and check that photons travel faster than $c$ between plates.

J. I. Latorre; P. Pascual; R. Tarrach

1994-08-03T23:59:59.000Z

497

Alternative to the principle of constant speed of light  

E-Print Network (OSTI)

To consider a medium carrying light and electromagnetic waves is impossible, when this medium shall have properties according to the principle of constant speed of light, that is, isotropy of speed of light in every system of reference. Therefore, with principle of constant speed of light abandoned, the so-called medium synchronization of clocks is defined, yielding isotropy solely in the system at rest and anisotropy in all moving systems. From medium synchronization the appropriate coordinate transformation is developed, the so-called medium transformation, a Galilean type of transformation, thus maintaining simultaneity between all participant systems of reference and changing the form of Maxwells equations to the extended Maxwell equations. Despite the fact that medium transformation violates Lorentz invariance and the principle of relativity, it is demonstrated that the results from medium transformation and extended Maxwell equations are fully compliant with observable phenomena. Moreover, it is shown that the concept of a medium, a preferred frame of reference, is compatible not only with medium transformation, but also with Lorentz transformation and with theory of special relativity, so it is quite possible now to consider a realistic medium. Finally, a discrepancy is exposed within theory of special relativity, giving rise to assume a preferred frame of reference even in special relativity.

Herbert Weiss

2006-06-28T23:59:59.000Z

498

Alternative Fuels Data Center: Low-Speed Electric Vehicle (EV) Access to  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Electric Low-Speed Electric Vehicle (EV) Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Electric Vehicle (EV) Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Electric Vehicle (EV) Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Electric Vehicle (EV) Access to Roadways on Google Bookmark Alternative Fuels Data Center: Low-Speed Electric Vehicle (EV) Access to Roadways on Delicious Rank Alternative Fuels Data Center: Low-Speed Electric Vehicle (EV) Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Electric Vehicle (EV) Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type

499

Alternative Fuels Data Center: Medium-Speed Electric Vehicle (EV) Access to  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Medium-Speed Electric Medium-Speed Electric Vehicle (EV) Access to Roadways to someone by E-mail Share Alternative Fuels Data Center: Medium-Speed Electric Vehicle (EV) Access to Roadways on Facebook Tweet about Alternative Fuels Data Center: Medium-Speed Electric Vehicle (EV) Access to Roadways on Twitter Bookmark Alternative Fuels Data Center: Medium-Speed Electric Vehicle (EV) Access to Roadways on Google Bookmark Alternative Fuels Data Center: Medium-Speed Electric Vehicle (EV) Access to Roadways on Delicious Rank Alternative Fuels Data Center: Medium-Speed Electric Vehicle (EV) Access to Roadways on Digg Find More places to share Alternative Fuels Data Center: Medium-Speed Electric Vehicle (EV) Access to Roadways on AddThis.com... More in this section... Federal State Advanced Search

500

Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways -  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Low-Speed Vehicle Low-Speed Vehicle Access to Roadways - Prudence Island to someone by E-mail Share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways - Prudence Island on Facebook Tweet about Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways - Prudence Island on Twitter Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways - Prudence Island on Google Bookmark Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways - Prudence Island on Delicious Rank Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways - Prudence Island on Digg Find More places to share Alternative Fuels Data Center: Low-Speed Vehicle Access to Roadways - Prudence Island on AddThis.com... More in this section... Federal State