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


1

Niobium Alloying in Grey Cast Iron for Vehicle Brake Discs  

Science Conference Proceedings (OSTI)

Presentation Title, Niobium Alloying in Grey Cast Iron for Vehicle Brake Discs. Author(s) ... Microtexture Analysis of a Hot Rolled Silicon Electric Steel · Niobium

2

Numerical Simulation of Brake Discs of CRH3 High-Speed Trains ...  

Science Conference Proceedings (OSTI)

... the research object?the course of emergency brake was simulated by ANSYS. .... Energy X-Ray Diffraction Microscopy Studies of Bulk Polycrystal Responses.

3

Experimental analysis of disc thickness variation development in motor vehicle brakes.  

E-Print Network (OSTI)

??Over the past decade vehicle judder caused by Disc Thickness Variation (DTV) has become of major concern to automobile manufacturers worldwide. Judder is usually perceived… (more)

Rodriguez, C

2006-01-01T23:59:59.000Z

4

Hybrid: Braking  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

1 1 Regenerative braking converts otherwise wasted energy from braking into electricity and stores it in the battery. In regenerative braking, the electric motor is reversed so that, instead of using electricity to turn the wheels, the rotating wheels turn the motor and create electricity. Using energy from the wheels to turn the motor slows the vehicle down. Go to nextÂ… stage graphic: vertical blue rule Main stage: See through car with battery, engine, and electric motor visible. The car is decelerating. There are arrows flowing from the front wheels to the electric motor to the battery. Main stage: See through car with battery, engine, and electric motor visible. The car is decelerating. There are arrows flowing from the front wheels to the electric motor to the battery.

5

Hybrid: Braking  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

2 2 If additional stopping power is needed, conventional friction brakes (e.g., disc brakes) are also applied automatically. Go backÂ… stage graphic: vertical blue rule Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection. Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection. Battery: The battery stores energy generated from the gasoline engine or, during regenerative braking, from the electric motor. Since the battery helps power the vehicle, it is larger and holds much more energy than batteries used to start conventional vehicles. Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection.

6

Full Hybrid: Braking  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Braking button highlighted Stopped button Braking button highlighted Stopped button BRAKING PART 1 Regenerative braking converts otherwise wasted energy from braking into electricity and stores it in the battery. In regenerative braking, the electric motor is reversed so that, instead of using electricity to turn the wheels, the rotating wheels turn the motor and create electricity. Using energy from the wheels to turn the motor slows the vehicle down. Go to nextÂ… stage graphic: vertical blue rule Main stage: See through car with battery, engine, generator, power split device, and electric motor visible. The car is decelerating. There are arrows flowing from the front wheels to the power split device to the electric motor to the battery. Main stage: See through car with battery, engine, generator, power split device, and electric motor visible. The car is decelerating. There are arrows flowing from the front wheels to the power split device to the electric motor to the battery.

7

Hybrid: Braking  

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

button highlighted Stopped Button subbanner graphic: gray bar BRAKING: PART 1 Regenerative braking converts otherwise wasted energy from braking into electricity and stores it in...

8

Brake rotor design and comparison using finite element analysis : an investigation in topology optimization.  

E-Print Network (OSTI)

??Disc brake technology used for mountain bikes, and mountain bike technology in general, has improved significantly as the sport of mountain biking has evolved. Disc… (more)

Domond, Kenneth

2010-01-01T23:59:59.000Z

9

Gravity brake  

DOE Patents (OSTI)

A mechanical gravity brake that prevents hoisted loads within a shaft from free-falling when a loss of hoisting force occurs. A loss of hoist lifting force may occur in a number of situations, for example if a hoist cable were to break, the brakes were to fail on a winch, or the hoist mechanism itself were to fail. Under normal hoisting conditions, the gravity brake of the invention is subject to an upward lifting force from the hoist and a downward pulling force from a suspended load. If the lifting force should suddenly cease, the loss of differential forces on the gravity brake in free-fall is translated to extend a set of brakes against the walls of the shaft to stop the free fall descent of the gravity brake and attached load.

Lujan, Richard E. (Santa Fe, NM)

2001-01-01T23:59:59.000Z

10

Braking system  

DOE Patents (OSTI)

A balanced braking system comprising a plurality of braking assemblies located about a member to be braked. Each of the braking assemblies consists of a spring biased piston of a first material fitted into a body of a different material which has a greater contraction upon cooling than the piston material. The piston is provided with a recessed head portion over which is positioned a diaphragm and forming a space therebetween to which is connected a pressurized fluid supply. The diaphragm is controlled by the fluid in the space to contact or withdraw from the member to be braked. A cooling means causes the body within which the piston is fitted to contract more than the piston, producing a tight shrink fit therebetween. The braking system is particularly applicable for selectively braking an arbor of an electron microscope which immobilizes, for example, a vertically adjustable low temperature specimen holder during observation. The system provides balanced braking forces which can be easily removed and re-established with minimal disturbance to arbor location.

Norgren, D.U.

1982-09-23T23:59:59.000Z

11

Hybrid: Braking  

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

Button Stopped button highlighted subbanner graphic: gray bar Button Stopped button highlighted subbanner graphic: gray bar STOPPED When the vehicle is stopped, such as at a red light, the gasoline engine and electric motor shut off automatically so that energy is not wasted in idling. The battery continues to power auxillary systems, such as the air conditioning and dashboard displays. stage graphic: vertical blue rule Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection. Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection. Battery: The battery stores energy generated from the gasoline engine or, during regenerative braking, from the electric motor. Since the battery helps power the vehicle, it is larger and holds much more energy than batteries used to start conventional vehicles. Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection.

12

Hybrid: Braking  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Button Stopped button highlighted subbanner graphic: gray bar Button Stopped button highlighted subbanner graphic: gray bar STOPPED When the vehicle is stopped, such as at a red light, the gasoline engine and electric motor shut off automatically so that energy is not wasted in idling. The battery continues to power auxillary systems, such as the air conditioning and dashboard displays. stage graphic: vertical blue rule Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection. Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection. Battery: The battery stores energy generated from the gasoline engine or, during regenerative braking, from the electric motor. Since the battery helps power the vehicle, it is larger and holds much more energy than batteries used to start conventional vehicles. Main stage: See through car with battery, engine, and electric motor visible. The car is stopped at an intersection.

13

Microsoft Word - ffort-07.html  

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

8SK100655 Seating Capacity: 2 Adults Features: AMFM Stereo, Battery Thermal Management, Power Steering, Power Brakes, Front Disc Brakes & Anti-Lock Brakes DIMENSIONS Wheelbase:...

14

Vehicle brake testing system  

SciTech Connect

This invention relates to a force measuring system capable of measuring forces associated with vehicle braking and of evaluating braking performance. The disclosure concerns an invention which comprises a first row of linearly aligned plates, a force bearing surface extending beneath and beside the plates, vertically oriented links and horizontally oriented links connecting each plate to a force bearing surface, a force measuring device in each link, a transducer coupled to each force measuring device, and a computing device coupled to receive an output signal from the transducer indicative of measured force in each force measuring device. The present invention may be used for testing vehicle brake systems.

Stevens, Samuel S [Harriman, TN; Hodgson, Jeffrey W [Lenoir City, TN

2002-11-19T23:59:59.000Z

15

Svendborg Brakes | Open Energy Information  

Open Energy Info (EERE)

energy Product Denmark-based manufacturer of braking systems for the wind industry, as well as for the oil sector. References Svendborg Brakes1 LinkedIn Connections CrunchBase...

16

Combined hydraulic and regenerative braking system  

DOE Patents (OSTI)

A combined hydraulic and regenerative braking system and method for an electric vehicle is disclosed. The braking system is responsive to the applied hydraulic pressure in a brake line to control the braking of the vehicle to be completely hydraulic up to a first level of brake line pressure, to be partially hydraulic at a constant braking force and partially regenerative at a linearly increasing braking force from the first level of applied brake line pressure to a higher second level of brake line pressure, to be partially hydraulic at a linearly increasing braking force and partially regenerative at a linearly decreasing braking force from the second level of applied line pressure to a third and higher level of applied line pressure, and to be completely hydraulic at a linearly increasing braking force from the third level to all higher applied levels of line pressure.

Venkataperumal, R.R.; Mericle, G.E.

1979-08-09T23:59:59.000Z

17

Combined hydraulic and regenerative braking system  

DOE Patents (OSTI)

A combined hydraulic and regenerative braking system and method for an electric vehicle, with the braking system being responsive to the applied hydraulic pressure in a brake line to control the braking of the vehicle to be completely hydraulic up to a first level of brake line pressure, to be partially hydraulic at a constant braking force and partially regenerative at a linearly increasing braking force from the first level of applied brake line pressure to a higher second level of brake line pressure, to be partially hydraulic at a linearly increasing braking force and partially regenerative at a linearly decreasing braking force from the second level of applied line pressure to a third and higher level of applied line pressure, and to be completely hydraulic at a linearly increasing braking force from the third level to all higher applied levels of line pressure.

Venkataperumal, Rama R. (Troy, MI); Mericle, Gerald E. (Mount Clemens, MI)

1981-06-02T23:59:59.000Z

18

Regenerative braking device  

DOE Patents (OSTI)

Disclosed are several embodiments of a regenerative braking device for an automotive vehicle. The device includes a plurality of rubber rollers (24, 26) mounted for rotation between an input shaft (14) connectable to the vehicle drivetrain and an output shaft (16) which is drivingly connected to the input shaft by a variable ratio transmission (20). When the transmission ratio is such that the input shaft rotates faster than the output shaft, the rubber rollers are torsionally stressed to accumulate energy, thereby slowing the vehicle. When the transmission ratio is such that the output shaft rotates faster than the input shaft, the rubber rollers are torsionally relaxed to deliver accumulated energy, thereby accelerating or driving the vehicle.

Hoppie, Lyle O. (Birmingham, MI)

1982-01-12T23:59:59.000Z

19

Variable ratio regenerative braking device  

DOE Patents (OSTI)

Disclosed is a regenerative braking device (10) for an automotive vehicle. The device includes an energy storage assembly (12) having a plurality of rubber rollers (26, 28) mounted for rotation between an input shaft (36) and an output shaft (42), clutches (38, 46) and brakes (40, 48) associated with each shaft, and a continuously variable transmission (22) connectable to a vehicle drivetrain and to the input and output shafts by the respective clutches. The rubber rollers are torsionally stressed to accumulate energy from the vehicle when the input shaft is clutched to the transmission while the brake on the output shaft is applied, and are torsionally relaxed to deliver energy to the vehicle when the output shaft is clutched to the transmission while the brake on the input shaft is applied. The transmission ratio is varied to control the rate of energy accumulation and delivery for a given rotational speed of the vehicle drivetrain.

Hoppie, Lyle O. (Birmingham, MI)

1981-12-15T23:59:59.000Z

20

Magnetite Formation Observed with TEM on Brake Discs  

Science Conference Proceedings (OSTI)

Carbothermal Production of Zrb2-Zro2 Composite Powder from Zro2-B2O3/B System by ... Lignocellulosic-Based Carbon Fibers from Biofuel Production Wastes.

Note: This page contains sample records for the topic "front disc brakes" 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

Commercial Motor Vehicle Brake Assessment Tools  

E-Print Network (OSTI)

Commercial Motor Vehicle Brake Assessment Tools Commercial Motor Vehicle Roadside Technology Corridor Safety Technology Showcase October 14, 2010 Commercial Motor Vehicle Roadside Technology Corridor #12;Overview · Commercial Motor Vehicle (CMV) Air Brake System · North American Standard Level-1

22

Brake blending strategy for a hybrid vehicle  

DOE Patents (OSTI)

A hybrid electric powertrain system is provided including a transmission for driving a pair of wheels of a vehicle and a heat engine and an electric motor/generator coupled to the transmission. A friction brake system is provided for applying a braking torque to said vehicle. A controller unit generates control signals to the electric motor/generator and the friction brake system for controllably braking the vehicle in response to a drivers brake command. The controller unit determines and amount of regenerative torque available and compares this value to a determined amount of brake torque requested for determining the control signals to the electric motor/generator and the friction brake system.

Boberg, Evan S. (Hazel Park, MI)

2000-12-05T23:59:59.000Z

23

CMV Brake Wear and Performance Test Little is known about the brake  

E-Print Network (OSTI)

inspections were due to brake defects. Additionally, brake maintenance and repair present a significant cost Center for Transportation Analysis (CTA) Research Areas Aviation Safety Air Traffic Management Analysis Environmental Policy Analysis Highway Safety Intelligent Transportation Systems Logistics Management Supply

24

Improved braking torque generation capacity of an eddy current brake with time varying magnetic fields: A numerical study  

Science Conference Proceedings (OSTI)

Eddy current brakes (ECB) are electrically controlled and non-contact actuators used as assistive brakes in vehicles. ECBs exhibit insufficient generated braking torque at low speeds. In order to overcome this, the use of AC magnetic fields with fixed ... Keywords: Automotive applications, Brake-by-wire, Eddy current brakes, Finite element analysis, Time-varying magnetic field

Kerem Karakoc; Edward J. Park; Afzal Suleman

2012-10-01T23:59:59.000Z

25

Microsoft Word - ffort-09.html  

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

VIN: 2CIMR5299567000106 Seating Capacity: 4 Adults Features: AMFM Radio, Heater, Battery Thermal Management, Power Steering, Power Brakes, Front Wheel Drive, Front Disc...

26

Commercial Motor Vehicle Brake-Related Research  

E-Print Network (OSTI)

Commercial Motor Vehicle Brake-Related Research Commercial Motor Vehicle Roadside Technology Corridor Safety Technology Showcase October 14, 2010 Commercial Motor Vehicle Roadside Technology Corridor

27

Multidisciplinary design optimization of an automotive magnetorheological brake design  

Science Conference Proceedings (OSTI)

This paper presents the development of a new electromechanical brake system using magnetorheological (MR) fluid. The proposed brake system consists of rotating disks immersed in a MR fluid and enclosed in an electromagnet, where the yield stress of the ... Keywords: Automotive brake, Computational fluid dynamics, Electric brake actuator, Finite element analysis, Magnetorheological fluid, Multidisciplinary design optimization

Edward J. Park; Luis Falcăo da Luz; Afzal Suleman

2008-02-01T23:59:59.000Z

28

The Application of Fuzzy Logic in Regenerative Braking of EV  

Science Conference Proceedings (OSTI)

Regenerative braking can improve energy usage efficiency and prolong the driving distance of electric vehicle per charge, effectively. In the paper, we design a sugeno’s fuzzy logic controller which has four inputs including driver’s braking ... Keywords: regenerative braking, fuzzy logic control, braking force distribution, ADVISOR

Zijian Zhang; Guoqing Xu; Weimin Li; Liang Zheng

2010-08-01T23:59:59.000Z

29

Method and apparatus for wind turbine braking  

DOE Patents (OSTI)

A method for braking a wind turbine including at least one rotor blade coupled to a rotor. The method includes selectively controlling an angle of pitch of the at least one rotor blade with respect to a wind direction based on a design parameter of a component of the wind turbine to facilitate reducing a force induced into the wind turbine component as a result of braking.

Barbu, Corneliu (Laguna Hills, CA); Teichmann, Ralph (Nishkayuna, NY); Avagliano, Aaron (Houston, TX); Kammer, Leonardo Cesar (Niskayuna, NY); Pierce, Kirk Gee (Simpsonville, SC); Pesetsky, David Samuel (Greenville, SC); Gauchel, Peter (Muenster, DE)

2009-02-10T23:59:59.000Z

30

Turbine disc sealing assembly  

SciTech Connect

A disc seal assembly for use in a turbine engine. The disc seal assembly includes a plurality of outwardly extending sealing flange members that define a plurality of fluid pockets. The sealing flange members define a labyrinth flow path therebetween to limit leakage between a hot gas path and a disc cavity in the turbine engine.

Diakunchak, Ihor S.

2013-03-05T23:59:59.000Z

31

Adaptive controller for regenerative and friction braking system  

DOE Patents (OSTI)

A regenerative and friction braking system for a vehicle having one or more roadwheels driven by an electric traction motor includes a driver responsive device for producing a brake demand signal having a magnitude corresponding to the level of braking force selected by the driver and friction and regenerative brakes operatively connected with the roadwheels of the vehicle. A system according to this invention further includes control means for operating the friction and regenerative braking subsystems so that maximum brake torques sustainable by the roadwheels of the vehicle without skidding or slipping will not be exceeded.

Davis, Roy I. (Ypsilanti, MI)

1990-01-01T23:59:59.000Z

32

Adaptive controller for regenerative and friction braking system  

DOE Patents (OSTI)

A regenerative and friction braking system for a vehicle having one or more road wheels driven by an electric traction motor includes a driver responsive device for producing a brake demand signal having a magnitude corresponding to the level of braking force selected by the driver and friction and regenerative brakes operatively connected with the road wheels of the vehicle. A system according to this invention further includes control means for operating the friction and regenerative braking subsystems so that maximum brake torques sustainable by the road wheels of the vehicle without skidding or slipping will not be exceeded. 8 figs.

Davis, R.I.

1990-10-16T23:59:59.000Z

33

Model and Simulation of a Super-capacitor Braking Energy Recovery System for Urban Railway Vehicles  

Science Conference Proceedings (OSTI)

In this paper, a braking energy recovery system based on super-capacitor was presented. The method use super-capacitor and the conventional braking resistance constitute a new braking unit to realize the regenerative energy recovery, when braking, braking ... Keywords: Urban railway transportation, regeneration braking, super-capacitor, energy recovery, electric traction

Chen Xiao-li; Yang Jian; Fang Yu

2010-08-01T23:59:59.000Z

34

Electric vehicle regenerative antiskid braking and traction control system  

DOE Patents (OSTI)

An antiskid braking and traction control system for an electric or hybrid vehicle having a regenerative braking system operatively connected to an electric traction motor, and a separate hydraulic braking system includes one or more sensors for monitoring present vehicle parameters and a processor, responsive to the sensors, for calculating vehicle parameters defining the vehicle behavior not directly measurable by the sensors and determining if regenerative antiskid braking control, requiring hydrualic braking control, or requiring traction control are required. The processor then employs a control strategy based on the determined vehicle state and provides command signals to a motor controller to control the operation of the electric traction motor and to a brake controller to control fluid pressure applied at each vehicle wheel to provide the appropriate regenerative antiskid braking control, hydraulic braking control, and traction control.

Cikanek, Susan R. (Wixom, MI)

1995-01-01T23:59:59.000Z

35

Electric vehicle regenerative antiskid braking and traction control system  

DOE Patents (OSTI)

An antiskid braking and traction control system for an electric or hybrid vehicle having a regenerative braking system operatively connected to an electric traction motor, and a separate hydraulic braking system includes one or more sensors for monitoring present vehicle parameters and a processor, responsive to the sensors, for calculating vehicle parameters defining the vehicle behavior not directly measurable by the sensors and determining if regenerative antiskid braking control, requiring hydraulic braking control, or requiring traction control are required. The processor then employs a control strategy based on the determined vehicle state and provides command signals to a motor controller to control the operation of the electric traction motor and to a brake controller to control fluid pressure applied at each vehicle wheel to provide the appropriate regenerative antiskid braking control, hydraulic braking control, and traction control. 10 figs.

Cikanek, S.R.

1995-09-12T23:59:59.000Z

36

Discs, outflows, and feedback in collapsing magnetized cores  

E-Print Network (OSTI)

The pre-stellar cores in which low mass stars form are generally well magnetized. Our simulations show that early protostellar discs are massive and experience strong magnetic torques in the form of magnetic braking and protostellar outflows. Simulations of protostellar disk formation suggest that these torques are strong enough to suppress a rotationally supported structure from forming for near critical values of mass-to-flux. We demonstrate through the use of a 3D adaptive mesh refinement code -- including cooling, sink particles and magnetic fields -- that one produces transient 1000 AU discs while simultaneously generating large outflows which leave the core region, carrying away mass and angular momentum. Early inflow/outflow rates suggest that only a small fraction of the mass is lost in the initial magnetic tower/jet event.

Duffin, Dennis

2010-01-01T23:59:59.000Z

37

The Research of Traction Motor Energy-Saving Regenerative Braking Control Technology  

Science Conference Proceedings (OSTI)

In all the motor braking control systems, regenerative braking is the only way of energy-saving braking control mode. It can convert dynamic energy which generate during braking period into electric energy, then return to the grid. In this paper, through ... Keywords: regenerative braking, traction motor, direct torque, stator flux, slip frequency

Yuhua Wang; Jianlin Miao; Yuanfang Wei

2010-05-01T23:59:59.000Z

38

Braking system for use with an arbor of a microscope  

DOE Patents (OSTI)

A balanced braking system comprising a plurality of braking assemblies located about a member to be braked. Each of the braking assemblies consists of a spring biased piston of a first material fitted into a body of a different material which has a greater contraction upon cooling than the piston material. The piston is provided with a recessed head portion over which is positioned a diaphragm and forming a space therebetween to which is connected a pressurized fluid supply. The diaphragm is controlled by the fluid in the space to contact or withdraw from the member to be braked. A cooling device causes the body within which the piston is fitted to contract more than the piston, producing a tight shrink fit therebetween. The braking system is particularly applicable for selectively braking an arbor of an electron microscope which immobilizes, for example, a vertically adjustable low temperature specimen holder during observation. The system provides balanced braking forces which can be easily removed and re-established with minimal disturbance to arbor location.

Norgren, Duane U. (Orinda, CA)

1984-01-01T23:59:59.000Z

39

Study on Regenerative Brake Method of Hybrid Electric Drive System of Armored Vehicle  

Science Conference Proceedings (OSTI)

Aiming at characteristics of regenerative brake of hybrid electric drive system of tracked armored vehicle, mechanism of regenerative brake by pulse width modulation is in-depth analyzed, motor speed, brake current, feedback current, feedback energy ... Keywords: hybrid electric drive, motor, regenerative brake

Li Hua; Zhong Meng-chun; Zhang Jian; Xu Da; Lin Hai

2011-10-01T23:59:59.000Z

40

Regenerative braking on bicycles to power LED safety flashers  

E-Print Network (OSTI)

This work develops a method for capturing some of the kinetic energy ordinarily lost during braking on bicycles to power LED safety flashers. The system is designed to eliminate: (a) battery changing in popular LED flashers, ...

Collier, Ian M

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Computational model design and performance estimation in registration brake control  

Science Conference Proceedings (OSTI)

Electric motorcycles are applicable to both toys and real motorcycles, and also is a reference for constructing larger electrical vehicles. A design computational model of regenerative braking control of electric motorcycles and an experimental identification ...

P. S. Pa; S. C. Chang

2009-06-01T23:59:59.000Z

42

Enclosed rotary disc air pulser  

DOE Patents (OSTI)

An enclosed rotary disc air pulser for use with a solvent extraction pulse olumn includes a housing having inlet, exhaust and pulse leg ports, a shaft mounted in the housing and adapted for axial rotation therein, first and second disc members secured to the shaft within the housing in spaced relation to each other to define a chamber therebetween, the chamber being in communication with the pulse leg port, the first disc member located adjacent the inlet port, the second disc member being located adjacent the exhaust port, each disc member having a milled out portion, the disc members positioned on the shaft so that as the shaft rotates, the milled out portions permit alternative cyclical communication between the inlet port and the chamber and the exhaust port and the chamber.

Olson, A. L. (Idaho Falls, ID); Batcheller, Tom A. (Idaho Falls, ID); Rindfleisch, J. A. (Arco, ID); Morgan, John M. (Arco, ID)

1989-01-01T23:59:59.000Z

43

Enclosed rotary disc air pulser  

DOE Patents (OSTI)

This invention is comprised of an enclosed rotary disc air pulser for use with a solvent extraction pulse column includes a housing having inlet, exhaust and pulse leg ports, a shaft mounted in the housing and adapted for axial rotation therein, first and second disc members secured to the shaft within the housing in spaced relation to each other to define a chamber there between, the chamber being in communication with the pulse leg port, and first disc member located adjacent the inlet port, the second disc member being located adjacent the exhaust port, each disc member having a milled out portion, the disc members positioned on the shaft so that as the shaft rotates, the milled out portions permit alternative cyclical communication between the inlet port and the chamber and the exhaust port and chamber. 5 figs.

Olson, A.L.; Batcheller, T.A.; Rindfleisch, J.A.; Morgan, J.M.

1988-08-12T23:59:59.000Z

44

Investigation of aerodynamic braking devices for wind turbine applications  

DOE Green Energy (OSTI)

This report documents the selection and preliminary design of a new aerodynamic braking system for use on the stall-regulated AWT-26/27 wind turbines. The goal was to identify and design a configuration that offered improvements over the existing tip brake used by Advanced Wind Turbines, Inc. (AWT). Although the design objectives and approach of this report are specific to aerodynamic braking of AWT-26/27 turbines, many of the issues addressed in this work are applicable to a wider class of turbines. The performance trends and design choices presented in this report should be of general use to wind turbine designers who are considering alternative aerodynamic braking methods. A literature search was combined with preliminary work on device sizing, loads and mechanical design. Candidate configurations were assessed on their potential for benefits in the areas of cost, weight, aerodynamic noise, reliability and performance under icing conditions. As a result, two configurations were identified for further study: the {open_quotes}spoiler-flap{close_quotes} and the {open_quotes}flip-tip.{close_quotes} Wind tunnel experiments were conducted at Wichita State University to evaluate the performance of the candidate aerodynamic brakes on an airfoil section representative of the AWT-26/27 blades. The wind tunnel data were used to predict the braking effectiveness and deployment characteristics of the candidate devices for a wide range of design parameters. The evaluation was iterative, with mechanical design and structural analysis being conducted in parallel with the braking performance studies. The preliminary estimate of the spoiler-flap system cost was $150 less than the production AWT-26/27 tip vanes. This represents a reduction of approximately 5 % in the cost of the aerodynamic braking system. In view of the preliminary nature of the design, it would be prudent to plan for contingencies in both cost and weight.

Griffin, D.A. [R. Lynette & Associates, Seattle, WA (United States)

1997-04-01T23:59:59.000Z

45

Exploring the parameter space of disc shaped silver nanoparticles for thin film silicon photovoltaics  

E-Print Network (OSTI)

We numerically simulate, using finite-difference time-domain, the optical properties of silver nano discs deposited on the front surface of silicon solar cells. We explore the effect of each of the parameters of such a system, in order to draw some general design rules for the subsequent fabrication of such structures.

Figeys, Bruno

2011-01-01T23:59:59.000Z

46

DiscLAimEr  

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

mAy 2013 mAy 2013 DiscLAimEr This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal li- ability or responsibility for the accuracy, completeness, or useful- ness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommenda- tion, or favoring by the United States Government or any agency

47

Fuzzy logic electric vehicle regenerative antiskid braking and traction control system  

DOE Patents (OSTI)

An regenerative antiskid braking and traction control system using fuzzy logic for an electric or hybrid vehicle having a regenerative braking system operatively connected to an electric traction motor, and a separate hydraulic braking system includes sensors for monitoring present vehicle parameters and a processor, responsive to the sensors, for calculating vehicle parameters defining the vehicle behavior not directly measurable by the sensor and determining if regenerative antiskid braking control, requiring hydraulic braking control, and requiring traction control are required. The processor then employs fuzzy logic based on the determined vehicle state and provides command signals to a motor controller to control operation of the electric traction motor and to the brake controller to control fluid pressure applied at each vehicle wheel to provide the appropriate regenerative braking control, hydraulic braking control, and traction control. 123 figs.

Cikanek, S.R.

1994-10-25T23:59:59.000Z

48

Fuzzy logic electric vehicle regenerative antiskid braking and traction control system  

DOE Patents (OSTI)

An regenerative antiskid braking and traction control system using fuzzy logic for an electric or hybrid vehicle having a regenerative braking system operatively connected to an electric traction motor, and a separate hydraulic braking system includes sensors for monitoring present vehicle parameters and a processor, responsive to the sensors, for calculating vehicle parameters defining the vehicle behavior not directly measurable by the sensor and determining if regenerative antiskid braking control, requiring hydraulic braking control, and requiring traction control are required. The processor then employs fuzzy logic based on the determined vehicle state and provides command signals to a motor controller to control operation of the electric traction motor and to the brake controller to control fluid pressure applied at each vehicle wheel to provide the appropriate regenerative braking control, hydraulic braking control, and traction control.

Cikanek, Susan R. (Wixom, MI)

1994-01-01T23:59:59.000Z

49

Regenerative braking device with rotationally mounted energy storage means  

DOE Patents (OSTI)

A regenerative braking device for an automotive vehicle includes an energy storage assembly (12) having a plurality of rubber rollers (26, 28) mounted for rotation between an input shaft (30) and an output shaft (32), clutches (50, 56) and brakes (52, 58) associated with each shaft, and a continuously variable transmission (22) connectable to a vehicle drivetrain and to the input and output shafts by the respective clutches. In a second embodiment the clutches and brakes are dispensed with and the variable ratio transmission is connected directly across the input and output shafts. In both embodiments the rubber rollers are torsionally stressed to accumulate energy from the vehicle when the input shaft rotates faster or relative to the output shaft and are torsionally relaxed to deliver energy to the vehicle when the output shaft rotates faster or relative to the input shaft.

Hoppie, Lyle O. (Birmingham, MI)

1982-03-16T23:59:59.000Z

50

Intensification of Ocean Fronts by Down-Front Winds  

Science Conference Proceedings (OSTI)

Many ocean fronts experience strong local atmospheric forcing by down-front winds, that is, winds blowing in the direction of the frontal jet. An analytic theory and nonhydrostatic numerical simulations are used to demonstrate the mechanism by ...

Leif N. Thomas; Craig M. Lee

2005-06-01T23:59:59.000Z

51

Oxygen-Diffused Titanium as a Candidate Brake Rotor Material  

SciTech Connect

Titanium alloys are one of several candidate materials for the next generation of truck disk brake rotors. Despite their advantages of lightweight relative to cast iron and good strength and corrosion resistance, titanium alloys are unlikely to be satisfactory brake rotor materials unless their friction and wear behavior can be significantly improved. In this study, a surface engineering process oxygen diffusion was applied to titanium rotors and has shown very encouraging results. The oxygen diffused Ti-6Al-4V (OD-Ti) was tested on a sub-scale brake tester against a flat block of commercial brake lining material and benchmarked against several other Ti-based materials, including untreated Ti-6Al-4V, ceramic particle-reinforced Ti composites (MMCs), and a thermal-spray-coated Ti alloy. With respect to friction, the OD-Ti outperformed all other candidate materials under the imposed test conditions with the friction coefficient remaining within a desirable range of 0.35-0.50, even under the harshest conditions when the disk surface temperature reached nearly 600 ?C. In addition, the OD-Ti showed significantly improved wear-resistance over the non-treated one and was even better than the Ti-based composite materials.

Qu, Jun [ORNL; Blau, Peter Julian [ORNL; Jolly, Brian C [ORNL

2009-01-01T23:59:59.000Z

52

The German Front Experiment 1987  

Science Conference Proceedings (OSTI)

The German Front Experiment, 1987 (GFE87) is a field experiment using aircraft, radar, surface, and upper-air observations to determine the influence of the European Alps on cold fronts. Measurements are concentrated in the Rhine Valley and in ...

Klaus P. Hoinka; Hans Volkert

1987-11-01T23:59:59.000Z

53

Heavy and Overweight Vehicle Brake Testing: Five-Axle Combination Tractor-Flatbed Final Report  

Science Conference Proceedings (OSTI)

The Federal Motor Carrier Safety Administration, in coordination with the Federal Highway Administration, sponsored the Heavy and Overweight Vehicle Brake Testing (HOVBT) program in order to provide information about the effect of gross vehicle weight (GVW) on braking performance. Because the Federal Motor Carrier Safety Regulations limit the number of braking system defects that may exist for a vehicle to be allowed to operate on the roadways, the examination of the effect of brake defects on brake performance for increased loads is also relevant. The HOVBT program seeks to provide relevant information to policy makers responsible for establishing load limits, beginning with providing test data for a combination tractor/trailer. This testing was conducted on a five-axle combination vehicle with tractor brakes meeting the Reduced Stopping Distance requirement rulemaking. This report provides a summary of the testing activities, the results of various analyses of the data, and recommendations for future research. Following a complete brake rebuild, instrumentation, and brake burnish, stopping tests were performed from 20 and 40 mph with various brake application pressures (15 psi, 25 psi, 35 psi, 45 psi, 55 psi, and full system pressure). These tests were conducted for various brake conditions at the following GVWs: 60,000, 80,000, 91,000, 97,000, 106,000, and 116,000 lb. The 80,000-lb GVWs included both balanced and unbalanced loads. The condition of the braking system was also varied. To introduce these defects, brakes (none, forward drive axle, or rear trailer axle) were made inoperative. In addition to the stopping tests, performance-based brake tests were conducted for the various loading and brake conditions. Analysis of the stopping test data showed the stopping distance to increase with load (as expected) and also showed that more braking force was generated by the drive axle brakes than the trailer axle brakes. The constant-pressure stopping test data revealed a linear relationship between brake application pressure and was used to develop an algorithm to normalize stopping data for weight and initial speed.

Lascurain, Mary Beth [ORNL] ORNL; Capps, Gary J [ORNL] ORNL; Franzese, Oscar [ORNL] ORNL

2013-10-01T23:59:59.000Z

54

Computer animation via optical video disc  

E-Print Network (OSTI)

This paper explores the notion of marrying two technologies: raster-scan computer animation and optical video discs. Animated sequences, generated at non real-time rates, then transfered to video disc, can be recalled under ...

Bender, Walter

1981-01-01T23:59:59.000Z

55

Reading of cracked optical discs using iterative learning control  

Science Conference Proceedings (OSTI)

Optical discs, including Compact Discs (CDs), Digital Versatile Discs (DVDs), and Blu-ray Discs (BDs), can get cracked during storage and usage. Such cracks commonly lead to discontinuities in the data track, potentially preventing reading of the data ...

Maarten Steinbuch; Koos Van Berkel; George Leenknegt; Tom Oomen; Jeroen Van De Wijdeven

2009-06-01T23:59:59.000Z

56

Energy Efficiency in Heavy Vehicle Tires, Drivetrains, and Braking Systems  

DOE Green Energy (OSTI)

This document was prepared to support the primary goals of the Department of Energy, Office of Heavy Vehicle Technologies. These were recently stated as follows: ''Develop by 2004 the enabling technologies for a class 7-8 truck with a fuel efficiency of 10 mpg (at 65 mph) which will meet prevailing emission standards. For Class 3-6 trucks operating on an urban driving cycle, develop by 2004 commercially viable vehicles that achieve at least double the fuel economy of comparable current vehicles (1999), and as a research goal, reduce criteria pollutants to 30% below EPA standards. Develop by 2004 the diesel engine enabling technologies to support large-scale industry dieselization of Class 1 and 2 trucks, achieving a 35 % fuel efficiency improvement over comparable gasoline-fueled trucks, while meeting applicable emissions standards.'' The enabling technologies for improving the fuel efficiency of trucks, include not only engine technologies but also technologies involved with lowering the rolling resistance of tires, reducing vehicle aerodynamic drag, improving thermal management, and reducing parasitic frictional losses in drive train components. Opportunities also exist for making better use of the energy that might ordinarily be dissipated during vehicle braking. Braking systems must be included in this evaluation since safety in truck operations is vital, and braking requirements are greater for vehicles having lowered resistance to rolling. The Office of Heavy Vehicle Technologies has initiated a program to improve the aerodynamics of heavy vehicles through wind tunnel testing, computational modeling, and on-road evaluations. That activity is described in a separate multi-year plan; therefore, emphasis in this document will be on tires, drive trains, and braking systems. Recent, dramatic fluctuations in diesel fuel prices have emphasized the importance of effecting savings in truck fuel economy by implementing new component designs and materials.

Peter J. Blau

2000-04-26T23:59:59.000Z

57

AB-Net Method of Protection from Projectiles (city, military base, battle-front, etc.)  

E-Print Network (OSTI)

The author suggests a low cost special AB-Net from artificial fiber, which may protect cities and important objects from rockets, artillery and mortar shells, projectiles, bullets, and strategic weapons. The idea is as follows: The offered AB-Net joins an incoming projectile to a small braking parachute and this incoming projectile loses speed by air braking after a drag distance of 50 - 150 meters. A following interception net after the first may serve to collect the slowed projectiles and their fragments or bomblets so that they do not reach the aimpoint. The author offers the design of AB-Net, a developed theory of snagging with a small braking parachute by AB-Net; and sample computations. These nets may be used for defense of a town, city, military base, battle-front line, road (from terrorists), or any important objects or installations (for example nuclear electric station, government buildings, etc.). Computed projects are: Net to counter small rockets (for example, from Qassam), net to counter artillery projectile (caliber 76 mm), net to counter bullets (caliber 7.6 mm). The offered method is cheaper by thousands of times than protection of a city by current anti-rocket systems. Discussion and results are at the end of the article. Key words: Protection from missile and projectile weapons, mortar, rocket, AB-Net, Qassam defense, incoming defense, armor.

Alexander Bolonkin

2008-02-13T23:59:59.000Z

58

AB-Net Method of Protection from Projectiles (city, military base, battle-front, etc.)  

E-Print Network (OSTI)

The author suggests a low cost special AB-Net from artificial fiber, which may protect cities and important objects from rockets, artillery and mortar shells, projectiles, bullets, and strategic weapons. The idea is as follows: The offered AB-Net joins an incoming projectile to a small braking parachute and this incoming projectile loses speed by air braking after a drag distance of 50 - 150 meters. A following interception net after the first may serve to collect the slowed projectiles and their fragments or bomblets so that they do not reach the aimpoint. The author offers the design of AB-Net, a developed theory of snagging with a small braking parachute by AB-Net; and sample computations. These nets may be used for defense of a town, city, military base, battle-front line, road (from terrorists), or any important objects or installations (for example nuclear electric station, government buildings, etc.). Computed projects are: Net to counter small rockets (for example, from Qassam), net to counter artille...

Bolonkin, Alexander

2008-01-01T23:59:59.000Z

59

VEHICLE SPECIFICATIONS Vehicle Features Base Vehicle: 2011 Hyundai  

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

1 Hyundai Sonata VIN: KMEHC4A43BA004932 Seatbelt Positions: 5 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc...

60

Tachyon cosmology, supernovae data, and the big brake singularity  

SciTech Connect

We compare the existing observational data on type Ia supernovae with the evolutions of the Universe predicted by a one-parameter family of tachyon models which we have introduced recently [Phys. Rev. D 69, 123512 (2004)]. Among the set of the trajectories of the model which are compatible with the data there is a consistent subset for which the Universe ends up in a new type of soft cosmological singularity dubbed big brake. This opens up yet another scenario for the future history of the Universe besides the one predicted by the standard {lambda}CDM model.

Keresztes, Z.; Gergely, L. A.; Gorini, V.; Moschella, U.; Kamenshchik, A. Yu. [Department of Theoretical Physics, University of Szeged, Tisza Lajos krt 84-86, Szeged 6720 (Hungary); Department of Experimental Physics, University of Szeged, Dom Ter 9, Szeged 6720 (Hungary); Department of Theoretical Physics, University of Szeged, Tisza Lajos krt 84-86, Szeged 6720 (Hungary); Department of Experimental Physics, University of Szeged, Dom Ter 9, Szeged 6720 (Hungary); Department of Applied Science, London South Bank University, 103 Borough Road, London SE1 OAA (United Kingdom); Dipartimento di Scienze Fisiche e Mathematiche, Universita dell'Insubria, Via Valleggio 11, 22100 Como (Italy); INFN, sezione di Milano, Via Celoria 16, 20133 Milano (Italy); Dipartimento di Fisica and INFN, via Irnerio 46, 40126 Bologna (Italy); L. D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, Kosygin street 2, 119334 Moscow (Russian Federation)

2009-04-15T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Dual-channel Haptic Synthesis of Viscoelastic Tissue Properties using Programmable Eddy Current Brakes  

Science Conference Proceedings (OSTI)

We describe a novel method for haptic synthesis of viscoelastic responses which employs a dual-channel haptic interface. It has motors that generate torque independently of velocity and brakes that generate viscous torque independently of position. ... Keywords: eddy current brakes, haptic simulation, viscoelastic simulation

Andrew H. C. Gosline; Vincent Hayward

2009-10-01T23:59:59.000Z

62

Simulation of PSO Fuzzy Control Stratety for Regenerative Braking of HEV  

Science Conference Proceedings (OSTI)

Based on particle swarm optimization algorithm, a new fuzzy controller was constructed and a fuzzy control strategy of regenerative braking for HEV was proposed. A model of a parallel hybrid electric vehicle was built. The performance of the default ... Keywords: hybrid electric vehicle, fuzzy control, regenerative braking, particle swarm optimization

Wang Chun; Tang Lan

2012-04-01T23:59:59.000Z

63

Operation Pattern Recognition and Control for Super Capacitor Braking Energy Regeneration System of Micro EV  

Science Conference Proceedings (OSTI)

Super capacitor has some advantages of high charge-discharge rate, long life, simple structure and reliable performance, and it is especially suitable as braking energy renewable energy storage device for electric vehicle and hybrid electric vehicle. ... Keywords: Super capacitor, braking energy regeneration, micro EV, pattern recognition and control

Jinyu Qu; Liyan Liang; Zhongyu Yang

2009-12-01T23:59:59.000Z

64

Cold Fronts in CDM clusters  

E-Print Network (OSTI)

Recently, high-resolution Chandra observations revealed the existence of very sharp features in the X-ray surface brightness and temperature maps of several clusters (Vikhlinin et. al., 2001). These features, called ``cold fronts'', are characterized by an increase in surface brightness by a factor >2 over 10-50 kpc, accompanied by a drop in temperature of a similar magnitude. The existence of such sharp gradients can be used to put interesting constraints on the physics of the intracluster medium (ICM), if their mechanism and longevity are well understood. Here, we present results of a search for cold fronts in high-resolution simulations of galaxy clusters in cold dark matter (CDM) models. We show that sharp gradients with properties similar to those of observed cold fronts naturally arise in cluster mergers when the shocks heat gas surrounding the merging sub-cluster, while its dense core remains relatively cold. The compression induced by supersonic motions and shock heating during the merger enhance the amplitude of gas density and temperature gradients across the front. Our results indicate that cold fronts are non-equilibrium transient phenomena and can be observed for a period of less than a billion years. We show that the velocity and density fields of gas surrounding the cold front can be very irregular which would complicate analyses aiming to put constraints on the physical conditions of the intracluster medium in the vicinity of the front.

Daisuke Nagai; Andrey V. Kravtsov

2002-06-26T23:59:59.000Z

65

Microsoft PowerPoint - Real-Time Dynamic Brake Assessment poster.ppt [Compatibility Mode]  

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

Dynamic Brake Assessment Dynamic Brake Assessment Purpose Conduct a proof-of-concept test to examine the feasibility of developing an on-board system to assess a vehicle's ability to stop based on typical low-pressure in-service braking events. Partnerships H.T. Hackney Company MGM Brakes Overview Funded through the Federal Motor Carrier Safety Administration's Vehicle and Roadside Operations Division Concept stemming from on the Department of Energy's Medium Truck Duty Cycle research as well as previous research conducted for the National Highway Transportation Safety Administration. Signals to be collected Real-time brake application pressure Vehicle speed and acceleration GPS location and grade information Vehicle weight (current load) Engine parameters such as RPM and torque To be conducted October 2010 -

66

Protoplanetary disc evolution and dispersal  

E-Print Network (OSTI)

pressure, which can stabilise a region against collapse. This simply means that the free-fall time must be considerably less than the sound crossing time, where t f f /tsc ? ??1/6T 1/2, meaning we need a cold, dense region. These stellar nurseries have been... 1990). During this disc formation phase, the central protostar is continuing to collapse, heating up from the energy realised due to the collapse. Eventually this protostar will reach the point at which it is hot enough for nuclear fusion to begin. Once...

Owen, James Edward

2011-10-11T23:59:59.000Z

67

Wind turbine trailing-edge aerodynamic brake design  

DOE Green Energy (OSTI)

This report describes the design of a centrifugally actuated aerodynamic-overspeed device for a horizontal-axis wind turbine. The device will meet the following criteria; (1) It will be effective for airfoil angles of attack 0{degrees} to 45{degrees}. (2) It will be stowed inside the blade profile prior to deployment. (3) It will be capable of offsetting the positive torque produced by the overall blade. (4) Hinge moments will be minimized to lower actuator loads and cost. (5) It will be evaluated as a potential power modulating active rotor-control system. A literature review of aerodynamic braking devices was conducted. Information from the literature review was used to conceptualize the most effective devices for subsequent testing and design. Wind-tunnel test data for several braking devices are presented in this report. Using the data for the most promising configuration, a preliminary design was developed for a MICON 65/13 wind turbine with Phoenix 7.9-m rotor blades.

Quandt, G.

1996-01-01T23:59:59.000Z

68

Towards a Molecular Inventory of Protostellar Discs  

E-Print Network (OSTI)

The chemical environment in circumstellar discs is a unique diagnostic of the thermal, physical and chemical environment. In this paper we examine the structure of star formation regions giving rise to low mass stars, and the chemical environment inside them, and the circumstellar discs around the developing stars.

Glenn J White; Mark A. Thompson; C. V. Malcolm Fridlund; Monica Huldtgren White

2003-11-27T23:59:59.000Z

69

The Sea-Breeze Front Analytical Model  

Science Conference Proceedings (OSTI)

Analytical solutions to the nonlinear equations of motion are used to describe the sea breeze front.

Yizhak Feliks

1988-03-01T23:59:59.000Z

70

Nonlinear Control Synthesis for a Self-energizing Electro-Hydraulic Brake  

E-Print Network (OSTI)

Nonlinear control algorithm for a self-energizing electro-hydraulic brake is analytically designed. The desired closed-loop system behavior is reached via a synthesized nonlinear controller.

Starykh, Alexey

2010-01-01T23:59:59.000Z

71

Observations of the Tasman Front  

Science Conference Proceedings (OSTI)

Ship and air surveys were conducted in 1978–79 to examine the thermal structure in and near the Tasman Front between Australia and New Zealand at latitudes between Brisbane and Bass Strait. After separation from the continental slope, the East ...

John C. Andrews; Martin W. Lawrence; Carl S. Nilsson

1980-11-01T23:59:59.000Z

72

The Evolution of Stellar Exponential Discs  

E-Print Network (OSTI)

Models of disc galaxies which invoke viscosity-driven radial flows have long been known to provide a natural explanation for the origin of stellar exponential discs, under the assumption that the star formation and viscous timescales are comparable. We present models which invoke simultaneous star formation, viscous redistribution of gas and cosmologically-motivated gaseous infall and explore the predictions such models make for the scale length evolution and radial star formation history of galactic stellar discs. While the inclusion of viscous flows is essential for ensuring that the stellar disc is always exponential over a significant range in radius, we find that such flows play essentially no role in determining the evolution of the disc scale length. In models in which the main infall phase precedes the onset of star formation and viscous evolution, we find the exponential scale length to be rather invariant with time. On the other hand, models in which star formation/viscous evolution and infall occur concurrently result in a smoothly increasing scale length with time, reflecting the mean angular momentum of material which has fallen in at any given epoch. The disc stellar populations in these models are predominantly young (ie. ages history predicted by our infall model and the recent observational determination of this quantity by Rocha-Pinto et al (2000).

Annette Ferguson; Cathie Clarke

2001-03-14T23:59:59.000Z

73

Light-Front Quantization and QCD Phenomena  

E-Print Network (OSTI)

The light-front quantization of QCD provides an alternative to lattice gauge theory for computing the mass spectrum, scattering amplitudes, and other physical properties of hadrons directly in Minkowski space. Nonperturbative light-front methods for solving gauge theory and obtaining light-front wavefunctions, such as discretized light-front quantization, the transverse lattice, and light-front resolvents are reviewed. The resulting light-front wavefunctions give a frame-independent interpolation between hadrons and their quark and gluon degrees of freedom, including an exact representation of spacelike form factors, transition form factors such as $B \\to \\ell \\bar \

S. J. Brodsky

2003-11-05T23:59:59.000Z

74

front  

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

Carbon Carbon Carbon Sequestration Sequestration State of the Science roadmapping future carbon sequestration R&D February 1999 A working paper for U.S. Department of Energy Office of Science Office of Fossil Energy i Carbon Sequestration DRAFT (February 1999) Dave Reichle, ORNL John Houghton, DOE Sally Benson, LBNL John Clarke, PNNL Roger Dahlman, DOE George Hendrey, BNL Howard Herzog, MIT Jennie Hunter-Cevera, LBNL Gary Jacobs, ORNL Rod Judkins, ORNL WORKING PAPER ON CARBON SEQUESTRATION SCIENCE AND TECHNOLOGY Office of Science Office of Fossil Energy U.S. Department of Energy Bob Kane, DOE Jim Ekmann, FETC Joan Ogden, Princeton Anna Palmisano, DOE Robert Socolow, Princeton John Stringer, EPRI Terry Surles, LLNL Alan Wolsky, ANL Nicholas Woodward, DOE Michael York, DOE ii DRAFT (February 1999) Carbon Sequestration

75

Kelvin Fronts on the Equatorial Thermocline  

Science Conference Proceedings (OSTI)

Properties of internal wave fronts or Kelvin fronts travelling eastward in the equatorial waveguide are studied, motivated by recent studies on coastal Kelvin waves and jumps and new data on equatorial Kelvin waves. It has been recognized for ...

Alexey V. Fedorov; W. Kendall Melville

2000-07-01T23:59:59.000Z

76

PV Frontogenesis and Upper-Tropospheric Fronts  

Science Conference Proceedings (OSTI)

Upper-tropospheric fronts and frontogenesis are viewed from a potental vorticity (PV) perspective. The rudiments of this approach are to regard such a front as a zone of strong PV gradient on isentropic surfaces, and to treat the accompanying ...

H. C. Davies; A. M. Rossa

1998-06-01T23:59:59.000Z

77

Turbulent Mixing at the Pacific Subtropical Front  

Science Conference Proceedings (OSTI)

Some advection of water across the North Pacific subtropical front occurs by the subduction of surface mixed layers from the north side of the front underneath surface waters on the south side. Cross-frontal advection in the thermocline is ...

Rolf G. Lueck

1988-12-01T23:59:59.000Z

78

BLM Sierra Front Field Office | Open Energy Information  

Open Energy Info (EERE)

Sierra Front Field Office Jump to: navigation, search Name BLM Sierra Front Field Office Short Name Sierra Front Parent Organization BLM Carson City District Office Address 5665...

79

Control of a dynamic brake to reduce turbine-generator shaft transient torques  

SciTech Connect

A resistive, thyristor-controlled brake is used to damp transient torques in large thermo-electric generators supplying series-compensated transmission lines. Emphasis is placed on developing a suitable control algorithm and testing the algorithm through a wide variety of different operating configurations. Discrete-level Generalized Predictive Control is examined as one possible approach to optimal control of the brake. Some problems with implementation of GPC on the system are discussed. Prony analysis is used to identify system transfer functions which are then related to control design considerations and robustness properties.

Donnelly, M.K.; Smith, J.R.; Johnson, R.M. (Montana State Univ., Bozeman, MT (United States)); Hauer, J.F. (Bonneville Power Administration, Kalispell, MT (United States)); Brush, R.W. (Montana Power Co., Butte, MT (United States)); Adapa, R. (Electric Power Research Inst., Palo Alto, CA (United States))

1993-02-01T23:59:59.000Z

80

Disc valve for sampling erosive process streams  

DOE Patents (OSTI)

This is a patent for a disc-type, four-port sampling valve for service with erosive high temperature process streams. Inserts and liners of ..cap alpha..-silicon carbide respectively, in the faceplates and in the sampling cavities, limit erosion while providing lubricity for a smooth and precise operation. 1 fig.

Mrochek, J.E.; Dinsmore, S.R.; Chandler, E.W.

1984-08-16T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Precision manufacture of optical disc master stampers  

E-Print Network (OSTI)

industry term for the mold used to replicate polymer compact discs (CDs) in an injection molding device are not required, and a ceramic master is used directly as a stamper for injection molding. In the new process, ceramic substrates are ion machined through a photoresist mask, resulting in improved productivity

Bifano, Thomas

82

VEHICLE SPECIFICATIONS Vehicle Features Base Vehicle: 2010 Honda  

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

Honda Honda Civic Hybrid VIN: JHMFA3F24AS005577 Seatbelt Positions: 5 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc Brakes Rear Disc Brakes Front Wheel Drive Regenerative Braking Anti-Lock Brakes Traction Control Air Bags AM/FM Stereo with CD State of Charge Meter 1 Weights Design Curb Weight: 2877 lb Delivered Curb Weight: 2982 lb Distribution F/R (%): 57/43 GVWR: 3792 lb GAWR F/R: 1973/1841 lb Payload 2 : 810 lb Performance Goal: 400 lb Dimensions Wheelbase: 106.3 in Track F/R: 59.1/60.2 in Length: 177.3 in Width: 69.0 in Height: 56.3 in Ground Clearance: 6.0 in Performance Goal: 5.0 in Tires Manufacturer: Bridgestone

83

Light-Front Holographic QCD  

SciTech Connect

The relation between the hadronic short-distance constituent quark and gluon particle limit and the long-range confining domain is yet one of the most challenging aspects of particle physics due to the strong coupling nature of Quantum Chromodynamics, the fundamental theory of the strong interactions. The central question is how one can compute hadronic properties from first principles; i.e., directly from the QCD Lagrangian. The most successful theoretical approach thus far has been to quantize QCD on discrete lattices in Euclidean space-time. Lattice numerical results follow from computation of frame-dependent moments of distributions in Euclidean space and dynamical observables in Minkowski spacetime, such as the time-like hadronic form factors, are not amenable to Euclidean lattice computations. The Dyson-Schwinger methods have led to many important insights, such as the infrared fixed point behavior of the strong coupling constant, but in practice, the analyses are limited to ladder approximation in Landau gauge. Baryon spectroscopy and the excitation dynamics of nucleon resonances encoded in the nucleon transition form factors can provide fundamental insight into the strong-coupling dynamics of QCD. New theoretical tools are thus of primary interest for the interpretation of the results expected at the new mass scale and kinematic regions accessible to the JLab 12 GeV Upgrade Project. The AdS/CFT correspondence between gravity or string theory on a higher-dimensional anti-de Sitter (AdS) space and conformal field theories in physical space-time has led to a semiclassical approximation for strongly-coupled QCD, which provides physical insights into its nonperturbative dynamics. The correspondence is holographic in the sense that it determines a duality between theories in different number of space-time dimensions. This geometric approach leads in fact to a simple analytical and phenomenologically compelling nonperturbative approximation to the full light-front QCD Hamiltonian 'Light-Front Holography'. Light-Front Holography is in fact one of the most remarkable features of the AdS/CFT correspondence. The Hamiltonian equation of motion in the light-front (LF) is frame independent and has a structure similar to eigenmode equations in AdS space. This makes a direct connection of QCD with AdS/CFT methods possible. Remarkably, the AdS equations correspond to the kinetic energy terms of the partons inside a hadron, whereas the interaction terms build confinement and correspond to the truncation of AdS space in an effective dual gravity approximation. One can also study the gauge/gravity duality starting from the bound-state structure of hadrons in QCD quantized in the light-front. The LF Lorentz-invariant Hamiltonian equation for the relativistic bound-state system is P{sub {mu}}P{sup {mu}}|{psi}(P)> = (P{sup +}P{sup -} - P{sub {perpendicular}}{sup 2})|{psi}(P)> = M{sup 2}|{psi}(P)>, P{sup {+-}} = P{sup 0} {+-} P{sup 3}, where the LF time evolution operator P{sup -} is determined canonically from the QCD Lagrangian. To a first semiclassical approximation, where quantum loops and quark masses are not included, this leads to a LF Hamiltonian equation which describes the bound-state dynamics of light hadrons in terms of an invariant impact variable {zeta} which measures the separation of the partons within the hadron at equal light-front time {tau} = x{sup 0} + x{sup 3}. This allows us to identify the holographic variable z in AdS space with an impact variable {zeta}. The resulting Lorentz-invariant Schroedinger equation for general spin incorporates color confinement and is systematically improvable. Light-front holographic methods were originally introduced by matching the electromagnetic current matrix elements in AdS space with the corresponding expression using LF theory in physical space time. It was also shown that one obtains identical holographic mapping using the matrix elements of the energy-momentum tensor by perturbing the AdS metric around its static solution. A gravity dual to QCD is not known, but th

Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; de Teramond, Guy F.; /Costa Rica U.

2012-02-16T23:59:59.000Z

84

Front Vehicle Setup Information Downloadable Dynamometer Database...  

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

Chevrolet Volt- 20F Test cell location Front Vehicle Setup Information Downloadable Dynamometer Database (D 3 )- Test Summary Sheet Vehicle architecture EREV Vehicle dynamometer...

85

Dispersing the Gaseous Protoplanetary Disc and Halting Type II Migration  

E-Print Network (OSTI)

More than 30 extra-solar Jupiter-like planets have shorter periods than the planet Mercury. It is generally accepted that they formed further out, past the ’snow line ’ (?1 AU), and migrated inwards. In order to be driven by tidal torques from the gaseous disc, the disc exterior to the planet had to contain about a planetary mass. The fact that the planets stopped migrating means that their outer disc was removed. We suggest, following the simulation by Bate et al. (2003), that the outer disc was accreted by the planet. This not only halts migration but removes the outer disc for planets interior to about 2 AU. The disc further out could have been removed by photoevaporation (Matsuyama et al. 2003). Furthermore, as also shown by Bate et al. (op cit) this process also provides an upper limit to planetary masses in agreement with the analysis of observed planetary masses by Zucker & Mazeh (2002). In this scenario, the endgame is a race. The central star is accreting the inner disc and the planet, while the planet is accreting the outer disc. The planet survives if it accretes its outer disc before being accreted by the star. The winner is determined solely by the ratio of the mass of the outer disc to the local surface density of the disc. Some planets are certainly eaten by the central star. Subject headings: extrasolar planets, Jupiter 1.

M. Lecar; D. D. Sasselov

2003-01-01T23:59:59.000Z

86

Examination of turbine discs from nuclear power plants  

SciTech Connect

Investigations were performed on a cracked turbine disc from the Cooper Nuclear Power Station, and on two failed turbine discs (governor and generator ends) from the Yankee-Rowe Nuclear Power Station. Cooper is a boiling water reactor (BWR) which went into commercial operation in July 1974, and Yankee-Rowe is a pressurized water reactor (PWR) which went into commercial operation in June 1961. Cracks were identified in the bore of the Cooper disc after 41,913 hours of operation, and the disc removed for repair. At Yankee-Rowe two discs failed after 100,000 hours of operation. Samples of the Cooper disc and both Yankee-Rowe disc (one from the governor and one from the generator end of the LP turbine) were sent to Brookhaven National Laboratory (BNL) for failure analysis.

Czajkowski, C.J.; Weeks, J.R.

1982-01-01T23:59:59.000Z

87

Intrusion Characteristics in the Antarctic Polar Front  

Science Conference Proceedings (OSTI)

Data obtained on two cruises to the Antarctic Polar Front are used to investigate the nature of thermohaline intrusions in the front. These data, obtained in the Drake Passage and south of New Zealand, include CTD time series made relative to ...

John M. Toole

1981-06-01T23:59:59.000Z

88

Cold Front Acceleration over Lake Michigan  

Science Conference Proceedings (OSTI)

High-resolution Eta Model simulations of a strong but relatively dry late winter surface cold front that occurred during the STORM-FEST project depicted a pronounced acceleration of the front during the afternoon hours over the southern end of ...

William A. Gallus Jr.; Moti Segal

1999-10-01T23:59:59.000Z

89

The light-front vacuum and dynamics  

E-Print Network (OSTI)

I give a quantum theoretical description of kinematically invariant vacuua on the algebra of free fields restricted to a light front and discuss the relation between the light-front Hamiltonian, P-, the vacuum, and Poincare invariance. This provides a quantum theoretical description of zero modes.

W. N. Polyzou

2004-09-22T23:59:59.000Z

90

Pressure transient method for front tracking  

DOE Green Energy (OSTI)

A pressure transient technique for tracking the advance of cold water fronts during water flooding and goethermal injection operations has been developed. The technique is based on the concept that the steady state pressure buildup in the reservoir region inside the front can be calculated by a fluid skin factor. By analyzing successive pressure falloff tests, the advance of the front in the reservoir can be monitored. The validity of the methods is demonstrated by application to three numerically simulated data sets, a nonisothermal step-rate injection test, a series of pressure falloffs in a multilayered reservoir, and a series of pressure falloff tests in a water flooded oil reservoir.

Benson, S.M.; Bodvarsson, G.S.

1983-08-01T23:59:59.000Z

91

Metallurgical evaluation of a failed LP turbine disc. Final report  

SciTech Connect

A metallurgical evaluation of a burst disc from the LP turbine at the Yankee Rowe nuclear generating station was performed. The turbine failure incident involves catastrophic rupture of both No. 1 discs during a start-up. The objectives of the evaluation were to characterize the disc materials and identify the cacking mechanism and other metallurgical factors involved in the failure. Metallographic and fractographic examinations of one segment of the No. generator-end disc were performed. The mechanical properties and composition of the disc segment were also determined. The investigation established that the radial fracture in the disc segment initiated at a service-induced crack and was of a generally brittle character. Also, numerous subcritical cracks were observed in the bore surface.

Burghard, H.C. Jr.

1982-12-01T23:59:59.000Z

92

Use of an auditory signal in a rear-end collision warning system: effects on braking force and reaction time  

E-Print Network (OSTI)

This simulator experiment is a preliminary study examining the effects of different auditory signals on braking force and reaction time in a rear-end collision warning system. A driving simulator was built in which subjects operated a computer driving game. Superimposed on the game screen was the image of a car which appeared to the driver to be ahead of him/her. The image enlarged in size, appearing to be a car applying its brakes. The participant was instructed to react as he would in a real driving situation by applying his/her brakes. Closing velocities of 10 miles per hour and 30 miles per hour were used. Braking times and forces were measured for four different warning sounds: 1) no warning; 2) a pulsed warning sound that increased in repetition rate; 3) a sound that increased in frequency; and, 4) a sound that increased in intensity. Results suggested that an auditory warning signal would decrease reaction time and increase maximum braking force applied. The sound that increased in frequency and the sound that increased in intensity provided the greatest savings in reaction time, approximately one quarter second, when compared to the no warning condition. The pulsed warning sound provided the greatest increase in braking force. Participants preferred the pulsed sound over the other warning sounds. Further research must be done to determine if the warning sounds decrease the reaction time enough to cause a significant reduction in accidents.

Hopkins, Jennifer Susan

1995-01-01T23:59:59.000Z

93

Probabilistic Assessment of Failure Risk in Gas Turbine Discs.  

E-Print Network (OSTI)

?? Gas turbine discs are heavily loaded due to centrifugal and thermal loads and are therefore designed for a service lifetime specified in hours and… (more)

Forsberg, Fredrik

2008-01-01T23:59:59.000Z

94

Collapse and Fragmentation of Molecular Cloud Cores. X. Magnetic Braking of Prolate and Oblate Cores  

E-Print Network (OSTI)

The collapse and fragmentation of initially prolate and oblate, magnetic molecular clouds is calculated in three dimensions with a gravitational, radiative hydrodynamics code. The code includes magnetic field effects in an approximate manner: magnetic pressure, tension, braking, and ambipolar diffusion are all modelled. The parameters varied for both the initially prolate and oblate clouds are the initial degree of central concentration of the radial density profile, the initial angular velocity, and the efficiency of magnetic braking (represented by a factor $f_{mb} = 10^{-4}$ or $10^{-3}$). The oblate cores all collapse to form rings that might be susceptible to fragmentation into multiple systems. The outcome of the collapse of the prolate cores depends strongly on the initial density profile. Prolate cores with central densities 20 times higher than their boundary densities collapse and fragment into binary or quadruple systems, whereas cores with central densities 100 times higher collapse to form single...

Boss, Alan P

2009-01-01T23:59:59.000Z

95

Bay Front Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

Front Biomass Facility Front Biomass Facility Jump to: navigation, search Name Bay Front Biomass Facility Facility Bay Front Sector Biomass Location Ashland County, Wisconsin Coordinates 46.9794969°, -90.4824892° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":46.9794969,"lon":-90.4824892,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

96

On the stability of subsonic thermal fronts  

Science Conference Proceedings (OSTI)

The stability of subsonic thermal fronts against corrugation is analyzed and an exact dispersion relation is obtained taking into account the compressibility of the gas. For heat fronts, this dispersion equation has an unstable root ({omega}{sub ex}) corresponding to the Landau-Darrieus unstable mode ({omega}{sub 0}) modified by the compressional effects. In particular, the exact solution shows a conspicuous maximum very close to the value of the intake Mach number M{sub 1} at which a Chapman-Jouguet deflagration wave behind the heat front is formed. Cooling fronts are stable for corrugation-like disturbances. A maximum damping as well as a maximum in the frequency occur at a value of M{sub 1} depending on the value of the normalized cooling q.

Ibanez S, Miguel H.; Shchekinov, Yuri; Bessega L, Maria C. [Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de los Andes, Apartado 26, Ipostel, La Hechicera, Merida (Venezuela); Department of Physics, University of Rostov, Rostov on Don, 34409 (Russian Federation); Centro de Fisica Teorica y Computacional, Escuela de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, Caracas (Venezuela)

2005-08-15T23:59:59.000Z

97

On the Minimum Scale of Surface Fronts  

Science Conference Proceedings (OSTI)

A series of numerical experiments of a surface front forced by stretching deformation using Clark's nonhydrostatic model at very high resolution is presented. These simulations are compared to those reported by Williams who used hydrostatic ...

R. L. Gall; R. T. Williams; T. L. Clark

1987-09-01T23:59:59.000Z

98

Climatology of Strong Intermountain Cold Fronts  

Science Conference Proceedings (OSTI)

Motivated by the intensity and severity of winds and temperature falls that frequently accompany rapidly developing cold fronts in northern Utah, this paper presents a 25-yr climatology of strong cold frontal passages over the Intermountain West ...

Jason C. Shafer; W. James Steenburgh

2008-03-01T23:59:59.000Z

99

Moist Convection at a Surface Cold Front  

Science Conference Proceedings (OSTI)

The motion of a surface cold front in an environment that is unstable to moist convection is studied with the aid ofboth hydrostatic and nonhydrostatic two-dimensional models. Simulations with the hydrostatic model essentially extend the work ...

N. Andrew Crook

1987-12-01T23:59:59.000Z

100

The Formation of New England Coastal Fronts  

Science Conference Proceedings (OSTI)

Coastal fronts are a frequent late fall and early winter feature of eastern New England weather. Data from a mesoscale observing network is used to describe the process of coastal frontogenesis and to determine the causes of formation. Three ...

John W. Nielsen

1989-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" from the National Library of EnergyBeta (NLEBeta).
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101

Stationary Shock Fronts in a Continuously Stratified Thermocline Model  

Science Conference Proceedings (OSTI)

Fronts are ubiquitous in the ocean. Recent work by Dewar has considered the formation of oceanic fronts in a simple layered model.

A. J. George Nurser

1995-12-01T23:59:59.000Z

102

How Many CVs are Crossing the Period Gap? A Test for the Disruption of Magnetic Braking  

E-Print Network (OSTI)

We apply population synthesis techniques to calculate the present day number of two types of white dwarf-main sequence star (WDMS) binaries within the cataclysmic variable period gap. The first are post-common envelope binaries with secondary stars that have masses between 0.17 and 0.36 Msun (gPCEBs), such that they will commence mass transfer within the period gap. The second type are systems that were CVs at some point in their past, but detached once they evolved down in orbital period to ~3 h as a consequence of disrupted magnetic braking, and are crossing the period gap via gravitational radiation (dCVs). Full population synthesis calculations are performed where we assume either constant, global values of the common envelope ejection efficiency, or consider the ejection efficiency as a function of secondary mass. Several forms of magnetic braking are also considered. We predict an excess of dCVs over gPCEBs within the period gap of ~4 to ~13 assuming an ejection efficiency between 0.1 and 0.6, and a flat initial mass ratio distribution. This excess is revealed as a prominent peak at the location of the period gap in the orbital period distribution of the combined gPCEB and dCV population. We suggest that if such a feature is observed in the orbital period distribution of an observed sample of short orbital period WDMS binaries, this would strongly corroborate the disruption of magnetic braking.

P. J. Davis; U. Kolb; B. Willems; B. T. Gänsicke

2008-05-30T23:59:59.000Z

103

Variations in gear fatigue life for different wind turbine braking strategies  

SciTech Connect

A large number of gearbox failures have occurred in the wind industry in a relatively short period, many because service loads were underestimated. High-torque transients that occur during starting and stopping are difficult to predict and may be overlooked in specifying gearbox design. Although these events comprise a small portion of total load cycles, they can be the most damaging. The severity of these loads varies dramatically with the specific configuration of the wind turbine. The large number of failures in Danish-designed Micon 65 wind turbines prompted this investigation. The high-speed and low-speed shaft torques were measured on a two-stage helical gearbox of a single Micon 65 turbine. Transient events and normal running loads were combined statistically to obtain a typical annual load spectrum. The pitting and bending fatigue lives of the gear teeth were calculated by using Miner's rule for four different high-speed shaft brake configurations. Each breaking scenario was run for both a high- and a low-turbulence normal operating load spectrum. The analysis showed increases in gear life by up to a factor of 25 when the standard high-speed shaft brake is replaced with a dynamic brake or modified with a damper. 9 refs., 9 figs., 3 tabs.

McNiff, B.P. (Second Wind, Inc., Somerville, MA (USA)); Musial, W.D. (Solar Energy Research Inst., Golden, CO (USA)); Errichello, R. (GEARTECH, Albany, CA (USA))

1991-06-01T23:59:59.000Z

104

Variations in gear fatigue life for different wind turbine braking strategies  

DOE Green Energy (OSTI)

A large number of gearbox failures have occurred in the wind industry in a relatively short period, many because service loads were underestimated. High-torque transients that occur during starting and stopping are difficult to predict and may be overlooked in specifying gearbox design. Although these events comprise a small portion of total load cycles, they can be the most damaging. The severity of these loads varies dramatically with the specific configuration of the wind turbine. The large number of failures in Danish-designed Micon 65 wind turbines prompted this investigation. The high-speed and low-speed shaft torques were measured on a two-stage helical gearbox of a single Micon 65 turbine. Transient events and normal running loads were combined statistically to obtain a typical annual load spectrum. The pitting and bending fatigue lives of the gear teeth were calculated by using Miner's rule for four different high-speed shaft brake configurations. Each breaking scenario was run for both a high- and a low-turbulence normal operating load spectrum. The analysis showed increases in gear life by up to a factor of 25 when the standard high-speed shaft brake is replaced with a dynamic brake or modified with a damper. 9 refs., 9 figs., 3 tabs.

McNiff, B.P. (Second Wind, Inc., Somerville, MA (USA)); Musial, W.D. (Solar Energy Research Inst., Golden, CO (USA)); Errichello, R. (GEARTECH, Albany, CA (USA))

1991-06-01T23:59:59.000Z

105

QCD and Light-Front Dynamics  

SciTech Connect

AdS/QCD, the correspondence between theories in a dilaton-modified five-dimensional anti-de Sitter space and confining field theories in physical space-time, provides a remarkable semiclassical model for hadron physics. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time. The result is a single-variable light-front Schroedinger equation which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The coordinate z in AdS space is uniquely identified with a Lorentz-invariant coordinate {zeta} which measures the separation of the constituents within a hadron at equal light-front time and determines the off-shell dynamics of the bound state wavefunctions as a function of the invariant mass of the constituents. The hadron eigenstates generally have components with different orbital angular momentum; e.g., the proton eigenstate in AdS/QCD with massless quarks has L = 0 and L = 1 light-front Fock components with equal probability. Higher Fock states with extra quark-anti quark pairs also arise. The soft-wall model also predicts the form of the nonperturbative effective coupling and its {beta}-function. The AdS/QCD model can be systematically improved by using its complete orthonormal solutions to diagonalize the full QCD light-front Hamiltonian or by applying the Lippmann-Schwinger method to systematically include QCD interaction terms. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. A method for computing the hadronization of quark and gluon jets at the amplitude level is outlined.

Brodsky, Stanley J.; de Teramond, Guy F.; /SLAC /Southern Denmark U., CP3-Origins /Costa Rica U.

2011-01-10T23:59:59.000Z

106

VEHICLE SPECIFICATIONS Vehicle Features  

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

Mazda 3 Mazda 3 VIN: JMZBLA4G601111865 Seatbelt Positions: 5 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc Brakes Rear Disc Brakes Front Wheel Drive Anti-Lock Brakes Traction Control Air Bags AM/FM Stereo with CD Weights Design Curb Weight: 2,954 lb Delivered Curb Weight: 2,850 lb Distribution F/R (%): 63/37 GVWR: 4,050 lb GAWR F/R: 2,057/1,896 lb Payload 1 : 1,096 lb Performance Goal: 400 lb Dimensions Wheelbase: 103.9 in Track F/R: 60.4/59.8 in Length: 175.6 in Width: 69.1 in Height: 57.9 in Ground Clearance: 6.1 in Performance Goal: 5.0 in Tires Manufacturer: Yokohama Model: YK520 Size: P205/55R17 Pressure F/R: 35/33 psi

107

Light-Front Holography and the Light-Front Schrodinger Equation  

SciTech Connect

One of the most important nonperturbative methods for solving QCD is quantization at fixed light-front time {tau} = t+z=c - Dirac's 'Front Form'. The eigenvalues of the light-front QCD Hamiltonian predict the hadron spectrum and the eigensolutions provide the light-front wavefunctions which describe hadron structure. More generally, we show that the valence Fock-state wavefunctions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schrodinger equation, with an effective confining potential U which systematically incorporates the effects of higher quark and gluon Fock states. We outline a method for computing the required potential from first principles in QCD. The holographic mapping of gravity in AdS space to QCD, quantized at fixed light-front time, yields the same light front Schrodinger equation; in fact, the soft-wall AdS/QCD approach provides a model for the light-front potential which is color-confining and reproduces well the light-hadron spectrum. One also derives via light-front holography a precise relation between the bound-state amplitudes in the fifth dimension of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The elastic and transition form factors of the pion and the nucleons are found to be well described in this framework. The light-front AdS/QCD holographic approach thus gives a frame-independent first approximation of the color-confining dynamics, spectroscopy, and excitation spectra of relativistic light-quark bound states in QCD.

Brodsky, Stanley J.; de Teramond, Guy

2012-08-15T23:59:59.000Z

108

DSD front models : nonideal explosive detonation  

SciTech Connect

The Detonation Shock Dynamics (DSD) method for propagating detonation in numerical simulation of detonation in high explosive (HE) is based on three elements: (1) a subscale theory of multi-dimensional detonation that treats the evolving detonation as a front with dynamics that depends only on metrics of the front (such as curvature, etc.), (2) high-resolution direct numerical sirnuliltion of detonation serving both to test existing subscale theories and suggest modifications, and (3) physical experiments to characterize multi-dimensional detonation propagation on real explosives and to calibrate the front models for use in engineering simulations. In this paper we describe our work on all three of these elements of the DSD method as it applies to detonation in nonideal explosives.

Bdzil, J. B. (John Bohdan); Short, M. (Mark Short); Aslam, T. D. (Tariq D.); Catanach, R. A. (Richard A.); Hill, L. G. (Larry G.)

2001-01-01T23:59:59.000Z

109

Scale-Free Thin Discs with an Isopedic Magnetic Field  

E-Print Network (OSTI)

Global stationary configurations of both aligned and logarithmic spiral MHD perturbations are constructed analytically within an axisymmetric background ofrazor-thin scale-free gas disc, which is embedded in an axisymmetric gravitational potential of a dark matter halo and involves an isopedic magnetic field almost vertically threaded through the disc plane. The scale-free index $\\beta$ of the disc rotation speed $v_{\\theta}\\propto R^{-\\beta}$ falls in the rangeof $(-1/2 , 1/2)$ where $R$ is the cylindrical radius. With the holding-back of a deep background dark matter halo potential, the isopedic magnetic field may be strong enough to allow for the magnetic tension force overtaking the disc self-gravity, which can significantly influence global stationary MHD perturbation configurations and stability properties of the scale-free disc system. Only for stationary logarithmic spiral MHD perturbations with a perturbation scale-free index $\\beta_1=1/4$ or for aligned stationary MHD perturbations, can the MHD disc maintain a constant radial flux of angularmomentum. The variable radial flux of angular momentum in the radial direction corresponds to a complex dispersion relation. The marginal instabilities foraxisymmetric MHD disturbances are also examined for a special case as an example. When the magnetic tension force overtakes the disc self-gravity, the scale-free disc can be completely stable against axisymmetric MHD disturbances of all wavelengths. We predict the possible existence of an isopedicallymagnetized gas disc system in rotation primarily confined by a massive dark matter halo potential.

Yue Wu; Yu-Qing Lou

2006-07-16T23:59:59.000Z

110

Solar tracker motor having a fixed caliper and a translating caliper each with an electromagnetic brake system  

Science Conference Proceedings (OSTI)

Concepts and technologies described herein provide for an accurate and cost-effective method for rotating a solar array disk for tracking the movement of the sun. According to various aspects, a motor includes a fixed caliper and a translating caliper positioned adjacent to one another. Electromagnetically controlled brakes on the translating caliper grip the solar array disk while adjacent, but spaced apart, electromagnets on the fixed caliper and the translating caliper are energized to create an attractive force that pulls the translating caliper with the solar array disk toward the fixed caliper. After reaching the fixed caliper, brakes on the fixed caliper are engaged with the disk, brakes on the translating caliper are released from the disk, and the translating caliper is pushed back to the starting location where the process repeats until the desired rotation is completed.

Rau, Scott James

2013-01-29T23:59:59.000Z

111

Examination of cracked turbine discs from nuclear power plants  

SciTech Connect

Investigations were performed on a cracked turbine disc from the Cooper Nuclear Power Station (BWR), and on two failed turbine discs from the Yankee-Rowe Nuclear Power Station (PWR). The Yankee-Rowe discs were subjected to SEM/EDAX, uniaxial tension tests, hardness testing, notch sensitivity tests, and environmental notched tensile tests. The results of this investigation support the model whereby the cracks initiated at startup of the turbine, probably from H/sub 2/S produced by hydrolysis of MoS/sub 2/, and grew at a rate consistent with published data for propagation of cracks in pure steam.

Czajkowski, C.J.; Weeks, J.R.

1983-03-01T23:59:59.000Z

112

An Objective Climatology of Carolina Coastal Fronts  

E-Print Network (OSTI)

This study describes a simple objective method to identify cases of coastal frontogenesis offshore of the Carolinas and to characterize the sensible weather associated with frontal passage at measurement sites near the coast. The identification method, based on surface hourly data from offshore and adjacent land stations, was applied to an 11-yr dataset (1984–94). A total of 379 coastal fronts was found, 70 of which eventually made landfall along the North Carolina coast; 112 that remained offshore, and 197 were termed diurnal since they remained offshore but disappeared during daylight hours. Results show that most coastal and offshore sites experience a wind shift of about 40°–70 ° and a warming of about 2°–3°C during the hour of frontal passage. Exceptions include sites near colder waters where the rates are markedly reduced and frontal passage is often less discernible. Excluding diurnal fronts, just over half the cases were associated with cold-air damming (CAD) during the cold season of 16 October–15 April. Most of these winter cases linked with CAD were onshore fronts. During the warm season, most fronts were diurnal, but the association with CAD was still significant. To explore the synoptic-scale environment, composite maps for the cold season were generated for all three frontal subtypes from NCEP–NCAR reanalysis data. Results show a strong surface anticyclone

K. Wyat Appel; Allen J. Riordan; Timothy A. Holley

2004-01-01T23:59:59.000Z

113

An Instability of Mature Cold Fronts  

Science Conference Proceedings (OSTI)

An instability of a cold front possessing a low-level warm-band precursor is examined within an f-plane, quasi- and semigeostrophic framework. The basic frontal state is taken to be two-dimensional and of uniform potential vorticity. Theoretical ...

Christoph Schär; Huw C. Davies

1990-04-01T23:59:59.000Z

114

A disc in the heart of the Ant nebula  

E-Print Network (OSTI)

We present the discovery of a silicate disc at the centre of the planetary nebula Mz3 (the Ant). The nebula was observed with MIDI on the Very Large Telescope Interferometer (VLTI). The visibilities obtained at different orientations clearly indicate the presence of a dusty, nearly edge-on disc in the heart of the nebula. An amorphous silicate absorption feature is clearly seen in our mid-IR spectrum and visibility curves. We used radiative transfer Monte Carlo simulations to constrain the geometrical and physical parameters of the disc. We derive an inner radius of 9 AU (~6mas assuming D=1.4kpc). This disc is perpendicular to, but a factor of 10^{3} smaller than the optical bipolar outflow.

Lykou, Foteini; Lagadec, Eric; Zijlstra, Albert

2007-01-01T23:59:59.000Z

115

A disc in the heart of the Ant nebula  

E-Print Network (OSTI)

We present the discovery of a silicate disc at the centre of the planetary nebula Mz3 (the Ant). The nebula was observed with MIDI on the Very Large Telescope Interferometer (VLTI). The visibilities obtained at different orientations clearly indicate the presence of a dusty, nearly edge-on disc in the heart of the nebula. An amorphous silicate absorption feature is clearly seen in our mid-IR spectrum and visibility curves. We used radiative transfer Monte Carlo simulations to constrain the geometrical and physical parameters of the disc. We derive an inner radius of 9 AU (~6mas assuming D=1.4kpc). This disc is perpendicular to, but a factor of 10^{3} smaller than the optical bipolar outflow.

Foteini Lykou; Olivier Chesneau; Eric Lagadec; Albert Zijlstra

2007-10-02T23:59:59.000Z

116

ANALYSIS OF CHECK VALVE DISC MOTION DURING A FLOW TRANSIENT  

SciTech Connect

An analysis of the dynamics of a check valve disc under the influence of a flow transient is presented. The impact velocities of the disc and the pressure surge resulting from extinguishing a fluid velocity are predicted. This analysis develops the equations of motion of a simple swing disc check valve from Newton's Second Law. Modifications of the analysis necessary for application to other types of valves are described. The developed equations are progiammed for the Philco-2000 digital computer in FORTRAN as the SLAM Code. The Code input consists of the characteristics of the valve and the flow transient. The output of the code includes the dynamics of the valve disc as a function of time and the pressure surge induced by valve closure. (H.G.G.)

Fuls, G.M.

1962-12-01T23:59:59.000Z

117

Causal Viscosity in Accretion Disc Boundary Layers  

E-Print Network (OSTI)

The structure of the boundary layer region between the disc and a comparatively slowly rotating star is studied using a causal prescription for viscosity. The vertically integrated viscous stress relaxes towards its equilibrium value on a relaxation timescale $\\tau$, which naturally yields a finite speed of propagation for viscous information. For a standard alpha prescription with alpha in the range 0.1-0.01, and ratio of viscous speed to sound speed in the range 0.02-0.5, details in the boundary layer are strongly affected by the causality constraint. We study both steady state polytropic models and time dependent models, taking into account energy dissipation and transport. Steady state solutions are always subviscous with a variety of $\\Omega$ profiles which may exhibit near discontinuities. For alpha =0.01 and small viscous speeds, the boundary layer adjusted to a near steady state. A long wavelength oscillation generated by viscous overstability could be seen at times near the outer boundary. Being confined there, the boundary layer remained almost stationary. However, for alpha =0.1 and large viscous speeds, short wavelength disturbances were seen throughout which could significantly affect the power output in the boundary layer. This could be potentially important in producing time dependent behaviour in accreting systems such as CVs and protostars.

W. Kley; J. C. B. Papaloizou

1997-01-14T23:59:59.000Z

118

Wakes of ram pressure stripped disc galaxies  

E-Print Network (OSTI)

Spiral galaxies that move through the intracluster medium lose a substantial amount of their gas discs due to ram pressure stripping. The recent observations of NGC 4388 by Oosterloo & van Gorkom 2005 reveal a tail of stripped gas of ~ 100 kpc behind the source galaxy. We present first 3D hydrodynamical simulations of the evolution of such ram pressure stripped tails. We find that if the ICM wind does not vary significantly over a period of a few 100 Myr, subsonic galaxies produce a tail with regular features similar to a von-Karman vortex street. In this case, the tail widens systematically by about 45 kpc per 100 kpc distance behind the source galaxy. The widening rate is independent of the galaxy's inclination for a large range of inclinations. For supersonic galaxies, the tail is more irregular than for subsonic ones. The tail observed for NGC 4388 is narrower than the tails in our simulations. Reasons for this difference may be additional physical processes such as heat conduction or viscosity. In addition, we conclude that the observed S-shape of this tail is not due to von Karman oscillations, because this galaxy is likely to move supersonically. A reason for the observed shape may be motions in the ambient ICM. Finally, we discuss implications for the distribution of metals in the ICM due to ram pressure stipping.

E. Roediger; M. Brueggen; M. Hoeft

2006-03-21T23:59:59.000Z

119

Concave accretion discs and X-ray reprocessing  

E-Print Network (OSTI)

Spectra of Seyfert Is are commonly modelled as emission from an X-ray illuminated flat accretion disc orbiting a central black hole. This provides both a reprocessed and direct component of the X-ray emission as required by observations of individual objects and possibly of the cosmological X-ray background. However, there is observational motivation to consider the role that an effectively concave disc surface might play: (1) a reprocessed fraction $> 1$ in individual Seyferts and the X-ray background, and (2) the commonality of a sharp iron line peak for Seyferts at 6.4KeV despite a strong dependence of peak location on inclination angle for flat disc models. Here it is shown that a concave disc may not only provide a larger total fraction of reprocessed photons but can also reprocess a much larger fraction of photons in its outer regions when compared to a flat disc. This reduces the sensitivity of the 6.4KeV peak location to the inner disc inclination angle because the outer regions are less affected by D...

Blackman, E G

1999-01-01T23:59:59.000Z

120

On the Robustness of Cool Disc Components in Bright ULXs  

E-Print Network (OSTI)

In this letter, we comment on the robustness of putative cool (kT ~ 0.2 keV) accretion disc components in the X-ray spectra of the most luminous (L ~ 10^40 erg/s) ultra-luminous X-ray sources (ULXs) in nearby normal galaxies. When compared to stellar-mass black holes, the low disc temperatures observed in some ULXs may imply intermediate-mass black hole primaries. Recent work has claimed that such soft excesses are unlikely to be actual disc components, based on the lack of variability in these components, and in the overall source flux. Other work has proposed that alternative phenomenological models, and complex Comptonisation models, rule-out cool disc components in ULX spectra. An inspection of the literature on Galactic stellar-mass black holes and black hole candidates demonstrates that the flux behaviours seen in specific ULXs are consistent with phenomena observed in well-known Galactic X-ray binaries. Applying Comptonisation models to simulated disc blackbody plus power-law spectra shows that at the sensitivity achieved in even the best ULX spectra, Comptonisation fits are highly model-dependent, and do not yield meaningful constraints on the accretion flow. In contrast, the need for a soft, thermal component does not appear to be model-dependent. As we have previously noted, soft thermal components in ULX spectra may not represent accretion discs, but present alternatives to this interpretation are not robust.

J. M. Miller; A. C. Fabian; M. C. Miller

2005-12-22T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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121

Front Range Energy LLC | Open Energy Information  

Open Energy Info (EERE)

Energy LLC Energy LLC Jump to: navigation, search Logo: Front Range Energy LLC Name Front Range Energy LLC Address 31375 Great Western Dr Place Windsor, Colorado Zip 80550 Sector Biofuels Product Ethanol producer Website http://www.frontrangeenergy.co Coordinates 40.4605154°, -104.8565272° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.4605154,"lon":-104.8565272,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

122

Front contact solar cell with formed emitter  

SciTech Connect

A bipolar solar cell includes a backside junction formed by an N-type silicon substrate and a P-type polysilicon emitter formed on the backside of the solar cell. An antireflection layer may be formed on a textured front surface of the silicon substrate. A negative polarity metal contact on the front side of the solar cell makes an electrical connection to the substrate, while a positive polarity metal contact on the backside of the solar cell makes an electrical connection to the polysilicon emitter. An external electrical circuit may be connected to the negative and positive metal contacts to be powered by the solar cell. The positive polarity metal contact may form an infrared reflecting layer with an underlying dielectric layer for increased solar radiation collection.

Cousins, Peter John (Menlo Park, CA)

2012-07-17T23:59:59.000Z

123

Pentan isomers compound flame front structure  

DOE Green Energy (OSTI)

The fuels (hexane, pentane, diethyl ether) and conditions investigated in this study are relevant to engine knock in spark- ignition engines. A review is provided of the field of low temperature hydrocarbon oxidation. Studies were made of radical and stable intermediate distribution in the front of cool flames: Maximum concentrations of H atoms and peroxy radicals were observed in the luminous zone of the cool flame front. Peroxy radicals appear before the luminous zone at 430 K due to diffusion. H atoms were found in cool flames of butane and hexane. H atoms diffuses from the luminous zone to the side of the fresh mixture, and they penetrate into the fresh mixture to a small depth. Extension of action sphear of peroxy radicals in the fresh mixture is much greater than that of H atoms due to their small activity and high concentrations.

Mansurov, Z.A.; Mironenko, A.W.; Bodikov, D.U.; Rachmetkaliev, K.N. [Kazakh Al-Farabi State National Univ., Almaty (Kazakhstan)

1995-08-13T23:59:59.000Z

124

A Conservative Front Tracking Method in N-Dimensions  

Science Conference Proceedings (OSTI)

We propose a fully conservative Front Tracking algorithm for systems of nonlinear conservation laws. The algorithm can be applied uniformly in one, two, three and N dimensions. Implementation details for this algorithm ... Keywords: Front tracking, conservation, discontinuity

Jinjie Liu; Hyun-Kyung Lim; James Glimm; Xiaolin Li

2007-05-01T23:59:59.000Z

125

The Vertical Structure of New England Coastal Fronts  

Science Conference Proceedings (OSTI)

Aircraft data from the New England Winter Storms Experiment (NEWSEX) are used to examine the vertical structure of four New England coastal fronts. The aircraft made multiple passes at varying elevations through the coastal fronts. The ...

John W. Nielsen; Peter P. Neilley

1990-09-01T23:59:59.000Z

126

Gust Front Characteristics as Detected by Doppler Radar  

Science Conference Proceedings (OSTI)

Gust fronts produce low altitude wind shear that can be hazardous to aircraft operations, especially during takeoff and landing. Radar meteorologists have long been able to identify gust front signatures in Doppler radar data, but in order to use ...

Diana L. Klingle; David R. Smith; Marilyn M. Wolfson

1987-05-01T23:59:59.000Z

127

Progress with the SNS front-end systems  

E-Print Network (OSTI)

47317 PROGRESS WITH THE SNS FRONT-END SYSTEMS* R. Keller,**the FES Team, “Status of the SNS Front-End Sys- tems, Paperof the LEBT Layout for SNS,” Paper MOD19, Linac 2000,

2001-01-01T23:59:59.000Z

128

Mutual Intrusion of a Gravity Current and Density Front Formation  

Science Conference Proceedings (OSTI)

A two-dimensional prognostic model was employed to examine the mutual intrusion of a gravity current and the formation of a density front. The results indicated strong vertical motion near the front and, with Earth rotation included, a baroclinic ...

Dono-Ping Wang

1984-07-01T23:59:59.000Z

129

Thermally induced wave-front distortions in laser windows  

SciTech Connect

A simple analytical expression is given for wave-front distortions and birefringence due to heating in laser windows. (AIP)

Greninger, C.E.

1986-08-01T23:59:59.000Z

130

On The Use of Eddy Current Brakes as Tunable, Fast Turn-On Viscous Dampers For Haptic Rendering  

E-Print Network (OSTI)

based on eddy current brakes because they are inexpensive, friction- e-mail: andrewg@cim.mcgill.ca e-mail: champ@cim.mcgill.ca e-mail: hayward@cim.mcgill.ca free, capable of fast turn-on time, and linear

Hayward, Vincent

131

CityCarControl : an electric vehicle drive-by-wire solution for distributed steering, braking and throttle control  

E-Print Network (OSTI)

In this paper, we propose CityCarControl, a system to manage the steering, braking, and throttle of a new class of intra-city electric vehicles. These vehicles have a focus on extreme light-weight and a small parking ...

Brown, Thomas B., M. Eng. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

132

An improved front tracking method for the Euler equations  

Science Conference Proceedings (OSTI)

An improved front tracking method for hyperbolic conservation laws is presented. The improved method accurately resolves discontinuities as well as continuous phenomena. The method is based on an improved front interaction model for a physically more ... Keywords: 35L65, 35L67, 65M12, 76L05, 76N15, Euler equations, Front tracking, Gas dynamics, Hyperbolic conservation laws

J. A. S. Witteveen; B. Koren; P. G. Bakker

2007-06-01T23:59:59.000Z

133

The Resonant Interaction of a Tropical Cyclone and a Tropopause Front in a Barotropic Model. Part I: Zonally Oriented Front  

Science Conference Proceedings (OSTI)

The interaction of a tropical cyclone and a zonally aligned tropopause front is investigated in an idealized framework. A nondivergent barotropic model is used in which the front is represented by a vorticity step, giving a jetlike velocity ...

Leonhard Scheck; Sarah C. Jones; Martin Juckes

2011-03-01T23:59:59.000Z

134

Injection Timing Effects on Brake Fuel Conversion Efficiency and Engine System's Respones  

E-Print Network (OSTI)

Societal concerns on combustion-based fuel consumption are ever-increasing. With respect to internal combustion engines, this translates to a need to increase brake fuel conversion efficiency (BFCE). Diesel engines are a relatively efficient internal combustion engine to consider for numerous applications, but associated actions to mitigate certain exhaust emissions have generally deteriorated engine efficiency. Conventionally, diesel engine emission control has centered on in-cylinder techniques. Although these continue to hold promise, the industry trend is presently favoring the use of after-treatment devices which create new opportunities to improve the diesel engine's brake fuel conversion efficiency. This study focuses on injection timing effects on the combustion processes, engine efficiency, and the engine system's responses. The engine in the study is a medium duty diesel engine (capable of meeting US EPA Tier III off road emission standards) equipped with common rail direct fuel injection, variable geometry turbo charging, and interfaced with a custom built engine controller. The study found that injection timing greatly affected BFCE by changing the combustion phasing. BFCE would increase up to a maximum then begin to decrease as phasing became less favorable. Combustion phasing would change from being mostly mixing controlled combustion to premixed combustion as injection timing would advance allowing more time for fuel to mix during the ignition delay. Combustion phasing, in turn, would influence many other engine parameters. As injection timing is advanced, in-cylinder temperatures and pressures amplify, and intake and exhaust manifold pressures deteriorate. Rate of heat release and rate of heat transfer increase when injection timing is advanced. Turbocharger speed falls with the advancing injection timing. Torque, however, rose to a maximum then fell off again even though engine speed and fueling rate were held constant between different injection timings. Interestingly, the coefficient of heat transfer changes from a two peak curve to a smooth one peak curve as the injection timing is advanced further. The major conclusion of the study is that injection advance both positively and negatively influences the diesel engine's response which contributes to the brake fuel conversion efficiency.

McLean, James Elliott

2011-08-01T23:59:59.000Z

135

Concave Accretion Discs and X-ray Reprocessing  

E-Print Network (OSTI)

Spectra of Seyfert Is are commonly modelled as emission from an X-ray illuminated flat accretion disc orbiting a central black hole. This provides both a reprocessed and direct component of the X-ray emission as required by observations of individual objects and possibly a fraction of the cosmological X-ray background. There is some observational motivation to at least consider the role that an effectively concave disc surface might play: (1) a reprocessed fraction $\\gsim 1/2$ in some Seyferts and possibly in the X-ray background, and (2) the commonality of a sharp iron line peak for Seyferts at 6.4KeV despite a dependence of peak location on inclination angle for flat disc models. Here it is shown that a concave disc may not only provide a larger total fraction of reprocessed photons, but can also reprocess a much larger fraction of photons in its outer regions when compared to a flat disc. This reduces the sensitivity of the 6.4KeV peak location to the inner disc inclination angle because the outer regions are less affected by Doppler and gravitational effects. If the X-ray source is isotropic, the reprocessed fraction is directly determined by the concavity. If the X-ray source is anisotropic, the location of iron line peak can still be determined by concavity but the total reflected fraction need not be as large as for the isotropic emitter case. The geometric calculations herein are applicable to general accretion disc systems illuminated from the center.

Eric G. Blackman

1999-01-16T23:59:59.000Z

136

A study of factors affecting foot movement time in a braking maneuver  

E-Print Network (OSTI)

The nature of foot movement time (MT) in an actual braking maneuver and in a stationary vehicle was investigated regarding the effects of age and gender of the driver and nature of the stimulus to which the driver was responding. ANOVAs showed that the nature of the stimulus was not a significant factor in length of MT, but distance between pedals and age-gender levels were found to have significant effects. For the actual braking maneuver, gender and the gender-by-age interaction were significant; in the stationary vehicle portion of the study, they were not. Mean foot MT for both genders over all conditions were 0.28 seconds for women and 0.22 seconds for men. For older drivers, over all conditions, the mean foot MT was 0.25 seconds, and, for the younger drivers, 0.24 seconds. Linear regressions revealed high intra-subject variation in MT, which was corroborated by comparing with data from other parts of the study. Poor r2 values for fitting the data to Fitts' Law and to a modification of Fitts' Law were attributed to this high intra-subject variation and to obtaining data from only two different movement amplitudes. It was found that drivers' foot MTs tended to converge to a common value when controlling the vehicle at 88 km/hr (55 mph) as opposed to sitting in the driver's seat while the vehicle was stationary; mean foot MT for each subject group decreased, and differences between genders and age groups significantly diminished while the car was in motion.

Berman, Andrea Helene

1994-01-01T23:59:59.000Z

137

Abundance structure and chemical evolution of the Galactic disc  

E-Print Network (OSTI)

We have obtained high-resolution, high signal-to-noise spectra for 899 F and G dwarf stars in the Solar neighbourhood. The stars were selected on the basis of their kinematic properties to trace the thin and thick discs, the Hercules stream, and the metal-rich stellar halo. A significant number of stars with kinematic properties 'in between' the thin and thick discs were also observed in order to in greater detail investigate the dichotomy of the Galactic disc. All stars have been homogeneously analysed, using the exact same methods, atomic data, model atmospheres, etc., and also truly differentially to the Sun. Hence, the sample is likely to be free from internal errors, allowing us to, in a multi-dimensional space consisting of detailed elemental abundances, stellar ages, and the full three-dimensional space velocities, reveal very small differences between the stellar populations.

Bensby, T

2009-01-01T23:59:59.000Z

138

Spatially hybrid computations for streamer discharges with generic features of pulled fronts: I. Planar fronts  

Science Conference Proceedings (OSTI)

Streamers are the first stage of sparks and lightning; they grow due to a strongly enhanced electric field at their tips; this field is created by a thin curved space charge layer. These multiple scales are already challenging when the electrons are ... Keywords: 52.65.Kj, 52.80.Pi, Hybrid model, Large deviations, Pulled fronts, Streamer discharge

Chao Li; Ute Ebert; Willem Hundsdorfer

2010-01-01T23:59:59.000Z

139

VEHICLE SPECIFICATIONS Vehicle Features Base Vehicle: 2010 Smart  

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

Smart Smart Fortwo MHD VIN: WME4513341K406476 Seatbelt Positions: 2 Standard Features: Air Conditioning Power Locks Power Steering Power Brakes Power Windows Cruise Control Front Disc Brakes Rear Drum Brakes Rear Wheel Drive Anti-Lock Brakes Traction Control Air Bags AM/FM Stereo with CD player Weights Design Curb Weight:1,818 lb Delivered Curb Weight: 1.742 lb Distribution F/R (%):44/56 GVWR: 2,244 lb GAWR F/R: 968/1,452 lb Payload 1 : 426 lb Performance Goal: 400 lb Dimensions Wheelbase: 73.5 in Track F/R: 50.5/54.5 in Length: 106.1 in Width: 61.4 in Height: 60.7 in Ground Clearance: 6.25 in Performance Goal: 5.0 in Tires Manufacturer: Continental Model: ContiproContact Size: Front -P155/60/R15

140

Rayleigh-Taylor Instability of Ionization Front around Black Holes  

E-Print Network (OSTI)

We examine the role of ionizing radiation emitted from black holes (BHs) in suppressing the growth of the Rayleigh-Taylor instability (RTI) across the ionization front (I-front) that forms when the gas fueling the BH is neutral. We use radiation-hydrodynamic simulations to show that the RTI is suppressed for non-accelerating fronts on all scales resolved in our simulations. A necessary condition for the stability of the I-front is that the radius of the Str\\"omgren sphere is larger than the Bondi radius. When this condition is violated the I-front collapses producing an accretion luminosity burst. Transient growth of the RTI occurs only during the accretion burst when the effective acceleration in the frame of reference of the I-front increases significantly due to the rapid expansion of the Str\\"omgren sphere.

Park, KwangHo; Di Matteo, Tiziana; Reynolds, Christopher S

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Front Tracking Model of Simultaneous Melting and Solidification ...  

Science Conference Proceedings (OSTI)

This results in dynamic melting and solidification throughout the weld pool, which can be modelled using the authors' Front Tracking algorithm. Melting is ...

142

Midplane sedimentation of large solid bodies in turbulent protoplanetary discs  

E-Print Network (OSTI)

We study the vertical settling of solid bodies in a turbulent protoplanetary disc. We consider the situation when the coupling to the gas is weak or equivalently when the particle stopping time tau_{st} due to friction with the gas is long compared to the orbital timescale Omega^{-1}. An analytical model, which takes into account the stochastic nature of the sedimentation process using a Fokker-Planck equation for the particle distribution function in phase space, is used to obtain the vertical scale height of the solid layer as a function of the vertical component of the turbulent gas velocity correlation function and the particle stopping time. This is found to be of the same form as the relation obtained for strongly coupled particles in previous work. We compare the predictions of this model with results obtained from local shearing box MHD simulations of solid particles embedded in a vertically stratified disc in which there is turbulence driven by the MRI. We find that the ratio of the dust disc thickness to the gas disc thickness satifies H_d/H=0.08 (Omega tau_{st})^{-1/2}, which is in very good agreement with the analytical model. By discussing the conditions for gravitational instability in the outer regions of protoplanetary discs in which there is a similar level of turbulence, we find that bodies in the size range 50 to 600 metres can aggregate to form Kuiper belt-like objects with characteristic radii ranging from tens to hundreds of kilometres.

A. Carballido; S. Fromang; J. Papaloizou

2006-10-03T23:59:59.000Z

143

Front contact solar cell with formed electrically conducting layers on the front side and backside  

SciTech Connect

A bipolar solar cell includes a backside junction formed by a silicon substrate and a first doped layer of a first dopant type on the backside of the solar cell. A second doped layer of a second dopant type makes an electrical connection to the substrate from the front side of the solar cell. A first metal contact of a first electrical polarity electrically connects to the first doped layer on the backside of the solar cell, and a second metal contact of a second electrical polarity electrically connects to the second doped layer on the front side of the solar cell. An external electrical circuit may be electrically connected to the first and second metal contacts to be powered by the solar cell.

Cousins, Peter John

2012-06-26T23:59:59.000Z

144

Factors to be Considered for Selection and Design of Rupture Disc  

SciTech Connect

All over the world numerous fatalities and large property losses have taken place because of Industrial Explosions. In order to mitigate the losses of life and property due to overpressure rupture discs are used. Successful implementation would depend on many factors and one of the important factors is the selection and design of rupture discs. There are several factors that affect the disc performance. The present paper discusses the factors that effect the disc performance so that the right type of disc can be selected. (authors)

Murty, D.V.R.; Bhaskar Rao, Y. [Indian Institute of Chemical Technology (India); Chennakeshava Reddy, A. [Jawaharlal Nehru Technological University (India)

2006-07-01T23:59:59.000Z

145

On the existence of high Lewis number combustion fronts  

Science Conference Proceedings (OSTI)

We study a mathematical model for high Lewis number combustion processes with the reaction rate of the form of an Arrhenius law with or without an ignition cut-off. An efficient method for the proof of the existence and uniqueness of combustion fronts ... Keywords: Combustion fronts, Geometric singular perturbation theory, Ignition cut-off

Anna Ghazaryan; Christopher Jones

2012-02-01T23:59:59.000Z

146

FLUCTUATIONS OF THE FRONT IN A STOCHASTIC COMBUSTION MODEL  

E-Print Network (OSTI)

FLUCTUATIONS OF THE FRONT IN A STOCHASTIC COMBUSTION MODEL #1; (FLUCTUATIONS DU FRONT DANS UN MODĂ?LE DE COMBUSTION) FRANCIS COMETS 1 , JEREMY QUASTEL 2 AND ALEJANDRO F. RAMĂŤREZ 3 Abstract. We consider an interacting particle system on the one dimensional lattice Z modeling combustion. The process

Quastel, Jeremy

147

Combustion fronts in porous media with two layers Steve Schecter  

E-Print Network (OSTI)

Combustion fronts in porous media with two layers layer 1 layer 2 Steve Schecter North Carolina Subject: Propagation of a combustion front through a porous medium with two parallel layers having different properties. · Each layer admits a traveling combustion wave. · The layers are coupled by heat

Schecter, Stephen

148

Wind-Driven Motion near a Shelf-Slope Front  

Science Conference Proceedings (OSTI)

A two-dimensional, two-layered frontal system is used to examine the wind-driven motion near a shelf-slope front. In the linear regime, the along-frontal current is characterized by barotropic perturbations. The front is dynamically passive and ...

Hsien Wang Ou

1984-06-01T23:59:59.000Z

149

Investigation of the Brazil Current front variability from altimeter data  

E-Print Network (OSTI)

Investigation of the Brazil Current front variability from altimeter data Gustavo J. Goni Atlantic, Brazil Abstract. The southwestern Atlantic Ocean is characterized by the confluence of the Brazil in conjunction with a two-layer dynamical ocean scheme to monitor the Brazil Current front and to investigate its

150

Topographic Effects on a Wintertime Cold Front in Taiwan  

Science Conference Proceedings (OSTI)

This paper describes an observational and numerical study of an intense wintertime cold front that occurred in Taiwan on 8 January 1996. The front was associated with rope clouds at the leading edge, and a broad area of stratiform clouds behind. ...

Fang-Ching Chien; Ying-Hwa Kuo

2006-11-01T23:59:59.000Z

151

Front lighted optical tooling method and apparatus  

DOE Patents (OSTI)

An optical tooling method and apparatus uses a front lighted shadowgraphic technique to enhance visual contrast of reflected light. The apparatus includes an optical assembly including a fiducial mark, such as cross hairs, reflecting polarized light with a first polarization, a polarizing element backing the fiducial mark and a reflective surface backing the polarizing element for reflecting polarized light bypassing the fiducial mark and traveling through the polarizing element. The light reflected by the reflecting surface is directed through a second pass of the polarizing element toward the frontal direction with a polarization differing from the polarization of the light reflected by the fiducial mark. When used as a tooling target, the optical assembly may be mounted directly to a reference surface or may be secured in a mounting, such as a magnetic mounting. The optical assembly may also be mounted in a plane defining structure and used as a spherometer in conjunction with an optical depth measuring instrument. A method of measuring a radius of curvature of an unknown surface includes positioning the spherometer on a surface between the surface and a depth measuring optical instrument. As the spherometer is frontally illuminated, the distance from the depth measuring instrument to the fiducial mark and the underlying surface are alternately measured and the difference in these measurements is used as the sagittal height to calculate a radius of curvature.

Stone, William J. (Kansas City, MO)

1985-06-18T23:59:59.000Z

152

Um estudo dos mecanismos de desgaste em disco de freio automotivo ventilado de ferro fundido cinzento perlítico com grafita lamelar.  

E-Print Network (OSTI)

??The main mechanims of wear, present in ventilated brake disc had been determined, when submited to the braking test in inertial dynamometric simulator. Were measured… (more)

Edison Marcelo Serbino

2005-01-01T23:59:59.000Z

153

EGISTERED DRBYIST CONTACT DISC1 ,QSURE F O W  

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

EGISTERED DRBYIST CONTACT DISC1 ,QSURE F EGISTERED DRBYIST CONTACT DISC1 ,QSURE F O W This form is to be completed by Executive Branch employees who are contacted by registered lobbyists regarding the Recovery Act. This report includes a written description of each contact, the date and time of the contact, and the names of the registered lobbyist(s) and the employee(s) with whom the contact took place. The information on this form will be available to the public on the Executive Branch agency's recovery website. Written materials prepared by registered lobbyists should be attached to this form for posting on the website. To be completed by the employee contacted. Name of the Date and time of mntact: Employee(s) Contacted (Name and Title) Brief description of the contad: (attach separate sheet if necessary)

154

Gas Turbine Rotor Life: General Electric FA Disc Cracking  

Science Conference Proceedings (OSTI)

This report covers the integrated results of the investigation into the occurrence of cooling slot and other rim cracking found in GE 7FA and 9FA gas turbine first and second stage rotor discs. Sections of the report address dimensional characterization, rim temperature measurement, metallurgical results, analytical methods, evaluation of mitigation approaches, and damage tolerance. Structural stress analysis assessed the effectiveness of the blend-polish-peen slot modification and a redesigned ...

2010-12-08T23:59:59.000Z

155

Midplane sedimentation of large solid bodies in turbulent protoplanetary discs  

E-Print Network (OSTI)

We study the vertical settling of solid bodies in a turbulent protoplanetary disc. We consider the situation when the coupling to the gas is weak or equivalently when the particle stopping time tau_{st} due to friction with the gas is long compared to the orbital timescale Omega^{-1}. An analytical model, which takes into account the stochastic nature of the sedimentation process using a Fokker-Planck equation for the particle distribution function in phase space, is used to obtain the vertical scale height of the solid layer as a function of the vertical component of the turbulent gas velocity correlation function and the particle stopping time. This is found to be of the same form as the relation obtained for strongly coupled particles in previous work. We compare the predictions of this model with results obtained from local shearing box MHD simulations of solid particles embedded in a vertically stratified disc in which there is turbulence driven by the MRI. We find that the ratio of the dust disc thickne...

Carballido, A; Papaloizou, J

2006-01-01T23:59:59.000Z

156

Light-Front Holographic QCD and the Confinement Potential  

E-Print Network (OSTI)

Light-Front Hamiltonian theory, derived from the quantization of the QCD Lagrangian at fixed light-front time \\tau = t+z/c, provides a rigorous frame-independent framework for solving nonperturbative QCD. The eigenvalues of the light-front QCD Hamiltonian predict the hadronic mass spectrum, and the eigensolutions provide the light-front wavefunctions describing hadron structure. The valence Fock-state wavefunctions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schrodinger equation, with an effective confining potential U which systematically incorporates the effects of higher quark and gluon Fock states. The potential U has a unique form if one requires that the action for zero quark mass remains conformally invariant. The holographic mapping of gravity in AdS space to QCD with a specific soft-wall dilaton yields the same light-front Schrodinger equation. It also gives a precise relation between the bound-state amplitudes in the fifth dimension z of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The elastic and transition form factors of the pion and the nucleons are found to be well described in this framework. The predictions include a zero-mass pion in the chiral limit, and linear Regge trajectories with the same slope in the radial quantum number n and orbital angular momentum L. The light-front AdS/QCD holographic approach thus gives a frame-independent representation of color-confining dynamics and the excitation spectra of light-quark hadrons in terms of a single mass parameter. We also discuss the implications of the underlying conformal template of QCD for renormalization scale-setting and the implications of light-front quantization for the value of the cosmological constant.

Stanley J. Brodsky; Guy F. de Téramond; Hans Günter Dosch

2013-08-23T23:59:59.000Z

157

Helicase activity on DNA as a propagating front  

E-Print Network (OSTI)

We develop a propagating front analysis, in terms of a local probability of zipping, for the helicase activity of opening up a double stranded DNA (dsDNA). In a fixed-distance ensemble (conjugate to the fixed-force ensemble) the front separates the zipped and unzipped phases of a dsDNA and a drive acts locally around the front. Bounds from variational analysis and numerical estimates for the speed of a helicase are obtained. Different types of helicase behaviours can be distinguished by the nature of the drive.

Somendra M. Bhattacharjee

2003-07-16T23:59:59.000Z

158

Light front approach to correlations in hot quark matter  

E-Print Network (OSTI)

We investigate two-quark correlations in hot and dense quark matter. To this end we use the light front field theory extended to finite temperature $T$ and chemical potential $\\mu$. Therefore it is necessary to develop quantum statistics formulated on the light front plane. As a test case for light front quantization at finite $T$ and $\\mu$ we consider the NJL model. The solution of the in-medium gap equation leads to a constituent quark mass which depends on $T$ and $\\mu$. Two-quark systems are considered in the pionic and diquark channel. We compute the masses of the two-body system using a $T$-matrix approach.

S. Strauss; M. Beyer; S. Mattiello

2005-11-01T23:59:59.000Z

159

A preliminary assessment of asbestos awareness and control measures in brake and clutch repair services in Knoxville and Knox County, Tennessee  

SciTech Connect

The pending OSHA standard revision proposed in 1990 to lower the asbestos Permissible Exposure Limit (PEL) and to mandate effective asbestos control measures (ACM) in brake and clutch assembly work may have a profound effect on industries involved in such operations. Health protection of workers will be improved and costs of improved control methods and training will increase. Considering these facts, this preliminary study was designed to assess the level of worker and management awareness of asbestos hazards associated with brake and clutch repair and to determine what ACM had been implemented by businesses in Knoxville and Knox County, Tennessee. The study, in a metropolitan area of approximately 336,000 people, revealed eight different categories of businesses conducting brake and clutch repair work with an estimated 363 potentially exposed employees. Results of the study suggest that managers and employees of the 80 businesses studied were in need of asbestos hazard awareness training and more adequate asbestos control measures.

Phillips, C.C. (Oak Ridge National Lab., TN (United States)); Hamilton, C.B.

1994-04-01T23:59:59.000Z

160

Cold Fronts Research Programme: Progress, Future Plans, and Research Directions  

Science Conference Proceedings (OSTI)

Following the analysis of data collected during Phases land II of the Cold Fronts Research Programme (CFRP) a conceptual model for the Australian summertime “cool change” has been proposed. The model provides a focus and a framework for the ...

B. F. Ryan; J. R. Garratt; K. J. Wilson; R. K. Smith

1985-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Diabatically Driven Discrete Propagation of Surface Fronts: A Numerical Analysis  

Science Conference Proceedings (OSTI)

Discrete frontal propagation has been identified as a process whereby a surface front discontinuously moves forward, without evidence of frontal passage across a mesoscale region. Numerical simulations are employed to examine the upper-level ...

George H. Bryan; J. Michael Fritsch

2000-07-01T23:59:59.000Z

162

A Marker Chain Front Tracking Method for Modelling Meniscus ...  

Science Conference Proceedings (OSTI)

Feb 1, 2002 ... A Marker Chain Front Tracking Method for Modelling Meniscus Dynamics in the Al Ingot Casting Process by F. Iversen, J.A. Bakken and S.T. ...

163

Misocyclone Characteristics along Florida Gust Fronts during CaPE  

Science Conference Proceedings (OSTI)

Multiple-Doppler radar and rawinsonde data are used to examine misocyclone characteristics along gust fronts observed during the Convection and Precipitation/Electrification (CaPE) project in Florida. The objective of this study is to investigate ...

Katja Friedrich; David E. Kingsmill; Carl R. Young

2005-11-01T23:59:59.000Z

164

DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility...  

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

DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho Uranium Enrichment Project to Create Over 1,000 Jobs in Idaho Washington, DC As part of a broad...

165

Observations of Seven Atmospheric Density Current Fronts in Dixon, California  

Science Conference Proceedings (OSTI)

Seven atmospheric density current fronts are identified in sequences of ground-based, scanning aerosol backscatter lidar images and in situ micrometeorological time series data that were collected simultaneously and nearly continuously between 15 ...

Shane D. Mayor

2011-05-01T23:59:59.000Z

166

Cold Fronts Research: The Australian Summertime “Cool Change”  

Science Conference Proceedings (OSTI)

Much of the significant weather of southeastern Australia is associated with the passage of cold fronts. In summer, such passages are often accompanied by rapid and extreme temperature fails, as hot continental northerly winds are replaced with ...

R. K. Smith; B. F. Ryan; A. J. Troup; K. J. Wilson

1982-09-01T23:59:59.000Z

167

Meteorological Tower Measurements of a Surface Cold Front  

Science Conference Proceedings (OSTI)

measurements from the Boulder Atmospheric Observatory meteorological research tower are used to describe the structure and physical processes of a strong surface cold front. Analysis reveals that the horizontal gradients in temperature and wind ...

M. A. Shapiro

1984-08-01T23:59:59.000Z

168

Tracking Gravity Waves in Baroclinic Jet-Front Systems  

Science Conference Proceedings (OSTI)

Using a two-dimensional Fourier decomposition and a four-dimensional ray-tracing technique, the propagating characteristics and source mechanisms of mesoscale gravity waves simulated in idealized baroclinic jet-front systems are investigated. The ...

Yonghui Lin; Fuqing Zhang

2008-07-01T23:59:59.000Z

169

Internal-Inertial Waves in a Surgasso Sea Front  

Science Conference Proceedings (OSTI)

This work examines the presence of internal-inertial waves in a front in the North Atlantic subtropical convergence zone. Results of Doppler shear profiler and towed thermistor chain surveys are displayed to document the position and magnitude of ...

Richard P. Mied; Colin Y. Shen; Clifford L. Trump; Gloria J. Lindemann

1986-11-01T23:59:59.000Z

170

Observations of Near-Inertial Waves in a Front  

Science Conference Proceedings (OSTI)

Near-inertial with horizontal scales O(10 km) dominate profiles of velocity finestructure collected in the North Pacific Subtropical Front during January 1980. Considerable spatial variability is observed. Two features in particular contain most ...

Eric Kunze; Thomas B. Sanford

1984-03-01T23:59:59.000Z

171

Advanced integrated safeguards using front-end-triggering devices  

SciTech Connect

This report addresses potential uses of front-end-triggering devices for enhanced safeguards. Such systems incorporate video surveillance as well as radiation and other sensors. Also covered in the report are integration issues and analysis techniques.

Howell, J.A.; Whitty, W.J.

1995-12-01T23:59:59.000Z

172

The Circulation Dynamics and Thermodynamics of Upper Ocean Density Fronts  

Science Conference Proceedings (OSTI)

This paper extends a previous hydrodynamic circulation model of established, persistent upper ocean density fronts by including a thermodynamic or buoyancy equation in the integral treatment. An analysis is also conducted of the variables related ...

Richard W. Garvine

1980-12-01T23:59:59.000Z

173

Generation and Separation of Mesoscale Eddies from Surface Ocean Fronts  

Science Conference Proceedings (OSTI)

This study is motivated by Arctic Ocean observations of sub-mixed layer eddies found at large distances from their assumed formation region of a surface ocean front. We explore eddy formation through high resolution numerical simulations of ...

Georgy E. Manucharyan; Mary-Louise Timmermans

174

Vertical Velocities in a Thunderstorm Gust Front and Outflow  

Science Conference Proceedings (OSTI)

Continuous vertically pointing measurements of a thunderstorm outflow, including its gust front, were obtained with a Doppler radar near New Salem, North Dakota. The measurements provide a high-resolution depiction of the vertical structure of ...

Brooks E. Martner

1997-05-01T23:59:59.000Z

175

Results of the SNS front end commissioning at Berkeley Lab  

E-Print Network (OSTI)

RESULTS OF THE SNS FRONT END COMMISSIONING AT BERKELEY LAB *USA A. Aleksandrov for the SNS Accelerator Physics Group andT. Shea for the SNS Beam Diagnostics Collaboration Oak Ridge

2002-01-01T23:59:59.000Z

176

The Behavior of Dry Cold Fronts Traveling Along a Coastline  

Science Conference Proceedings (OSTI)

Observations of intense, dry summertime cold fronts in southeast Australia provide evidence for frontal deformation (cold air surges) in the coastal region well to the west of the main mountain range. This compares with the severe deformation ...

J. R. Garratt; P. A. C. Howells; E. Kowalczyk

1989-06-01T23:59:59.000Z

177

A Geostrophic Adjustment Model of a Tidal Mixing Front  

Science Conference Proceedings (OSTI)

This paper presents a model of a tidal mixing front as occurring between well mixed and (seasonally) stratified water in tidally energetic areas in continental shelf seas. The model examines the geostrophic adjustment of a stratified two-layer ...

G. J. F. van Heijst

1985-09-01T23:59:59.000Z

178

Town of Front Royal, Virginia (Utility Company) | Open Energy Information  

Open Energy Info (EERE)

Town of Front Royal, Virginia (Utility Company) Town of Front Royal, Virginia (Utility Company) Jump to: navigation, search Name Town of Front Royal Place Virginia Utility Id 6803 Utility Location Yes Ownership M NERC Location SERC Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Commercial Dusk to Dawn Light poles Commercial Residential Residential Average Rates Residential: $0.0928/kWh Commercial: $0.0796/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=Town_of_Front_Royal,_Virginia_(Utility_Company)&oldid=411737"

179

Formation and Maintenance of Shelfbreak Fronts in an Unstratified Flow  

Science Conference Proceedings (OSTI)

A depth-averaged model with no density variations was used by Chapman to describe the formation of a passive tracer front at a shelfbreak. The relevance of this frontogenesis mechanism to cases that allow vertical variations is examined by ...

Glen Gawarkiewicz; David C. Chapman

1991-08-01T23:59:59.000Z

180

Influence of Mesoscale Orography on Idealized Cold Fronts  

Science Conference Proceedings (OSTI)

A three-dimensional numerical model based on the inviscid and adiabatic primitive equations in the Boussinesq approximation is used to investigate the retardation of cold fronts by high two and three-dimensional mountains, approximately the same ...

U. Schumann

1987-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Parametric Study of Front-End Nuclear Fuel Cycle Costs  

Science Conference Proceedings (OSTI)

This study provides an overview of front-end fuel cost components for nuclear plants, specifically uranium concentrates, uranium conversion services, uranium enrichment services, and nuclear fuel fabrication services. A parametric analysis of light-water reactor (LWR) fuel cycle costs is also included in order to quantify the impacts that result from changes in the cost of one or more front-end components on overall fuel cycle costs.

2009-02-20T23:59:59.000Z

182

Front Range Forest Health Partnership Phase 1 feasibility study  

DOE Green Energy (OSTI)

The Front Range Forest Health Partnership is an alliance of individuals, citizen groups, federal, state, private, and nonprofit organizations that formed to promote forest health restoration and reduce fire risks on Colorado's Front Range. The partnership promotes selective thinning to restore forest health and supports economically feasible end uses for wood waste materials. The Phase I study was initiated to determine the environmental and economic feasibility of using wood wastes from forested and urban areas for the production of fuel-grade ethanol.

Volkin, P

1998-09-01T23:59:59.000Z

183

NIST/Library of Congress (LoC) Optical Disc Longevity Testing ...  

Science Conference Proceedings (OSTI)

... and the Preservation Directorate at the Library of Congress ... IEC 60908 (1999-02): Compact disc digital audio system. ... SPIE 1663, 443–446, 1992. ...

2007-09-20T23:59:59.000Z

184

Variability of black-hole accretion discs: a theoretical study  

E-Print Network (OSTI)

modified by over 400 active volcanoes. The Sun changes its spots during the 11-year cycle while other stars vary strongly in brightness as they pulsate. In the solar case, variability is intrinsic to the astrophysical object. It can also be extrinsic if, e... of relativistic compact objects with their surroundings. Measurements of X-ray variability and theoretical studies of black-hole disc accretion have therefore been intimately related for the past 30 or 40 years. Combined, they provide a unique window...

Ferreira, Bárbara Trovăo

2010-06-08T23:59:59.000Z

185

Exploring the Effects of Crosslinking on the Intervertebral Disc  

E-Print Network (OSTI)

Crosslinking soft tissue has become more common in tissue engineering applications, and recent studies have demonstrated that soft tissue mechanical behavior can be directly altered through crosslinking, but increased understanding of how crosslinking affects intervertebral disc mechanical behavior is needed. In vitro testing of bovine disc and motion segments was used to characterize several important aspects of disc behavior in response to crosslinking after both soaking and injection treatment. The first study was a comparison of different crosslinkers to determine the effect on tensile properties of disc tissue. Circumferential specimens were taken from bovine annulus and then soak treated with an optimized crosslinking formulation or sham solution. A non-contacting laser micrometer was used to measure cross sectional area, after which tension testing until failure was performed to determine yield strain, yield stress, ultimate stress, peak modulus, and resilience. The crosslinkers were observed to produce different changes in the properties, with the measured properties generally increasing. The second study used bilateral annular injections to simulate a clinically relevant delivery method. The dose response of the motion segment’s neutral zone stability metrics against injection concentration was mapped. Concentrations of 20 mM and less had no significant effects on the stability metrics. 40mM demonstrated a change in neutral zone stiffness, while at least 80mM was required to significantly affect neutral zone length. Thus, meaningful changes in joint neutral zone stability were demonstrated using clinically relevant injection and chemical formulations. The third study used combinations of biochemical and accelerated mechanical cyclic loading to degrade gelatin and annulus fibrosus specimens with and without genipin treatment. Genipin crosslinking attenuated changes during cyclic loading to specimen geometry and compliance relative to control samples. Full recovery of genipin treated samples appeared to be hampered, at least partially from continued crosslinking during the accelerated testing. The fourth study tested the effect of genipin crosslinking to resist interlamellar shearing of the annulus lamella. Using a recently reported test method that shears adjacent lamella, crosslinked specimens were noted to have significantly higher yield force, peak force, and resilience compared to sham treated controls, supporting the hypothesis that crosslinking would increase the load bearing ability of the interface.

Kirking, Bryan

2012-12-01T23:59:59.000Z

186

Physical Parameter Eclipse Mapping of the quiescent disc in V2051 Ophiuchi  

E-Print Network (OSTI)

We analyse simultaneous UBVR quiescent light curves of the cataclysmic variable V2051 Oph using the Physical Parameter Eclipse Mapping method in order to map the gas temperature and surface density of the disc for the first time. The disc appears optically thick in the central regions and gradually becomes optically thin towards the disc edge or shows a more and more dominating temperature inversion in the disc chromosphere. The gas temperatures in the disc range from about 13500 K near the white dwarf to about 6000 K at the disc edge. The intermediate part of the disc has temperatures of 9000 K to 6500 K. The quiescent disc (chromosphere) shows a prominent bright region with temperatures of 10500 K around the impact region of the stream from the secondary with an extension towards smaller azimuths. The disc has a size of 0.53 +- 0.03 R_L1 and a mass accretion rate of between dM/dt = 10^15 g/s to 10^17g/s. The light curves must include an uneclipsed component, a hot chromosphere and/or a disc wind. The PPEM method allows us to determine a new distance of 146+-20pc, compatible with previous rough estimates. For the white dwarf we then reconstruct a temperature of 19600 K, if the lower hemisphere of the white dwarf is occulted by the disc. We find that although V2051 Oph is very similar to the SU UMa type dwarf novae HT Cas, OY Car and Z Cha, there must be a substantial difference in order to explain its unique light curve. For further details and results see paper.

S. Vrielmann; Rae F. Stiening; Warren Offutt

2002-03-22T23:59:59.000Z

187

Microsoft Word - ford99.html  

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

FM Stereo Radio Tilt Steering Wheel Cabin Heat Dual Air Bags Power Steering (electro-hydraulic) Power Brakes Four Wheel Disc Brakes Four Wheel Anti-Lock Brakes Regenerative...

188

Optimal design of aeroengine turbine disc based on kriging surrogate models  

Science Conference Proceedings (OSTI)

A design optimization method based on kriging surrogate models is proposed and applied to the shape optimization of an aeroengine turbine disc. The kriging surrogate model is built to provide rapid approximations of time-consuming computations. For improving ... Keywords: Design of experiments, Differential evolutionary algorithm, Kriging method, Optimal design, Surrogate model, Turbine disc

Zhangjun Huang; Chengen Wang; Jian Chen; Hong Tian

2011-01-01T23:59:59.000Z

189

Replication of high density optical disc using injection mold with MEMS heater  

Science Conference Proceedings (OSTI)

In this study, an injection mold equipped with a MEMS heater was designed and constructed to raise the stamper surface temperature over the glass transition temperature during the filling stage of the injection molding. First, high density optical disc ... Keywords: High density optical disc, Injection mold, MEMS RTD sensor, MEMS heater, Solidified layer, Stamper surface temperature

Youngmin Kim; Yong Choi; Shinill Kang

2005-07-01T23:59:59.000Z

190

Cross-Front Mixing and Frontal Upwelling in a Controlled Quasi-Permanent Density Front in the Gulf of St. Lawrence  

Science Conference Proceedings (OSTI)

CTD data obtained from three transects across a controlled quasi-permanent density front in the Gulf of St. Lawrence were analyzed for the purpose of investigating cross-front mixing, mechanisms for frontal convergence, secondary circulation ...

C. L. Tang

1983-08-01T23:59:59.000Z

191

NETL's Supercomputer Addresses Energy Issues on Two Fronts | Department of  

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

NETL's Supercomputer Addresses Energy Issues on Two Fronts NETL's Supercomputer Addresses Energy Issues on Two Fronts NETL's Supercomputer Addresses Energy Issues on Two Fronts September 26, 2013 - 10:42am Addthis The visualization center for the SBEUC (Simulation Based Engineering User Center). Located at the Department’s National Energy Technology Laboratory in Morgantown, W. Va., the SBEUC will be powered by a high performance computer that will allow researchers to simulate phenomena that are difficult or impossible to probe experimentally. The results from simulations will become accessible through user centers that provide advanced visualization capabilities and foster collaboration among researchers. The SBEUC will be used for developing and deploying simulation tools required for overcoming energy technology barriers quickly and reliably.

192

Rayleigh-Taylor Instability at Ionization Fronts: Perturbation Analysis  

E-Print Network (OSTI)

The linear growth rate of the Rayleigh-Taylor instability (RTI) at ionization fronts is investigated via perturbation analysis in the limit of incompressible fluids. In agreement with previous numerical studies is found that absorption of ionizing radiation inside the HII region due to hydrogen recombinations suppresses the growth of instabilities. In the limit of a large density contrast at the ionization front the RTI growth rate has the simple analytical solution n=-nur+(nur^2+gk)^(1/2), where nur is the hydrogen recombination rate inside the HII region, k is the perturbation's wavenumber and g is the effective acceleration in the frame of reference of the front. Therefore, the growth of surface perturbations with wavelengths lambda >> lambda_{cr} = 2\\pi g/nur^2 is suppressed by a factor (lambda_{cr}/4lambda)^(1/2) with respect to the non-radiative incompressible RTI. Implications on stellar and black hole feedback are briefly discussed.

Ricotti, Massimo

2013-01-01T23:59:59.000Z

193

Methods for enhancing mapping of thermal fronts in oil recovery  

DOE Patents (OSTI)

A method for enhancing the resistivity contrasts of a thermal front in an oil recovery production field as measured by the CSAMT technique is disclosed. This method includes the steps of: (a) preparing a CSAMT-determined topological resistivity map of the production field; (b) introducing a solution of a dopant material into the production field at a concentration effective to alter the resistivity associated with the thermal front; said dopant material having a high cation exchange capacity which might be selected from the group consisting of montmorillonite, illite, and chlorite clays; said material being soluble in the connate water of the production field; (c) preparing a CSAMT-determined topological resistivity map of the production field while said dopant material is moving therethrough; and (d) mathematically comparing the maps from step (a) and step (c) to determine the location of the thermal front. This method is effective with the steam flood, fire flood and water flood techniques.

Lee, David O. (Albuquerque, NM); Montoya, Paul C. (Albuquerque, NM); Wayland, Jr., James R. (Albuquerque, NM)

1987-01-01T23:59:59.000Z

194

Methods for enhancing mapping of thermal fronts in oil recovery  

DOE Patents (OSTI)

A method for enhancing the resistivity contrasts of a thermal front in an oil recovery production field as measured by the controlled source audio frequency magnetotelluric (CSAMT) technique is disclosed. This method includes the steps of: (1) preparing a CSAMT-determined topological resistivity map of the production field; (2) introducing a solution of a dopant material into the production field at a concentration effective to alter the resistivity associated with the thermal front; said dopant material having a high cation exchange capacity which might be selected from the group consisting of montmorillonite, illite, and chlorite clays; said material being soluble in the conate water of the production field; (3) preparing a CSAMT-determined topological resistivity map of the production field while said dopant material is moving therethrough; and (4) mathematically comparing the maps from step (1) and step (3) to determine the location of the thermal front. This method is effective with the steam flood, fire flood and water flood techniques.

Lee, D.O.; Montoya, P.C.; Wayland, J.R. Jr.

1984-03-30T23:59:59.000Z

195

The Application of Compact Discs (CD-ROM) in the Atmospheric Sciences and Related Fields: An Update  

Science Conference Proceedings (OSTI)

This paper describes the current application of compact discs (CD-ROM) to the storage and distribution of datasets for atmospheric sciences and related disciplines. CD-ROM technology is reviewed, currently available discs are listed, and a look ...

Clifford F. Mass

1993-10-01T23:59:59.000Z

196

On the dynamics of a twisted disc immersed in a radiation field  

E-Print Network (OSTI)

We study the dynamics of a twisted tilted disc under the influence of an external radiation field. Assuming the effect of absorption and reemission/scattering is that a pressure is applied to the disc surface where the local optical depth is of order unity, we determine the response of the vertical structure and the influence it has on the possibility of instability to warping. We derive a pair of equations describing the evolution of a small tilt as a function of radius in the small amplitude regime that applies to both the diffusive and bending wave regimes. We also study the non linear vertical response of the disc numerically using an analogous one dimensional slab model. For global warps, we find that in order for the disc vertical structure to respond as a quasi uniform shift or tilt, as has been assumed in previous work, the product of the ratio of the external radiation momentum flux to the local disc mid plane pressure, where it is absorbed, with the disc aspect ratio should be significantly less than unity. Namely, this quantity should be of the order of or smaller than the ratio of the disc gas density corresponding to the layer intercepting radiation to the mid plane density, $\\lambda \\ll 1$. When this condition is not satisfied the disc surface tends to adjust so that the local normal becomes perpendicular to the radiation propagation direction. In this case dynamical quantities determined by the disc twist and warp tend to oscillate with a large characteristic period $T_{*}\\sim \\lambda^{-1}T_{K}$, where $T_{K}$ is some 'typical' orbital period of a gas element in the disc. The possibility of warping instability then becomes significantly reduced. In addition, when the vertical response is non uniform, the possible production of shocks may lead to an important dissipation mechanism.

P. B. Ivanov; J. C. B. Papaloizou

2007-10-14T23:59:59.000Z

197

HINS Linac front end focusing system R&D  

SciTech Connect

This report summarizes current status of an R&D program to develop a focusing system for the front end of a superconducting RF linac. Superconducting solenoids will be used as focusing lenses in the low energy accelerating sections of the front end. The development of focusing lenses for the first accelerating section is in the production stage, and lens certification activities are in preparation at FNAL. The report contains information about the focusing lens design and performance, including solenoid, dipole corrector, and power leads, and about cryogenic system design and performance. It also describes the lens magnetic axis position measurement technique and discusses scope of an acceptance/certification process.

Apollinari, G.; Carcagno, R.H.; Dimarco, J.; Huang, Y.; Kashikhin, V.V.; Orris, D.F.; Page, T.M.; Rabehl, R.; Sylvester, C.; Tartaglia, M.A.; Terechkine, I.; /Fermilab /Argonne

2008-08-01T23:59:59.000Z

198

Automatic cup-to-disc ratio estimation using active contours and color clustering in fundus images for glaucoma diagnosis  

Science Conference Proceedings (OSTI)

In this paper we propose a new automatic technique for the segmentation of the Optic Disc (OD) and optic nerve head (cup) regions in retinographies for glaucoma diagnosis. It provides an estimation of the Cup-to-Disc Ratio, the main clinical indicator ... Keywords: K-means, cup-to-disc-ratio, glaucoma, retinal images

Irene Fondón; Francisco Núńez; Mercedes Tirado; Soledad Jiménez; Pedro Alemany; Qaisar Abbas; Carmen Serrano; Begońa Acha

2012-06-01T23:59:59.000Z

199

2009 BMW MINI EVAmerica fact sheet.pdf  

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

3230 lb 3230 lb Delivered Curb Weight: 3306 lb Distribution F/R: 51/49 % GVWR: 3660 lb Payload 2 : 354 lb Performance Goal: 400 lb DIMENSIONS Wheelbase: 97.1 inches Track F/R: 57.4/57.8 inches Length: 145.6 inches Width: 66.3 inches Height: 55.4 inches Ground Clearance: 6.0 inches Performance Goal: 5.0 inches CHARGER Level 1: Location: On-board Type: Conductive Input Voltages: 120VAC Level 2: Location: Off-board Type: Conductive Input Voltages: 240 VAC © 2009 Electric Transportation Applications All Rights Reserved BASE VEHICLE: 2009 BMW MINI E Seatbelt Positions: Two Standard Features: Front Wheel Drive Front Disc and Rear Disc Brakes Regenerative Braking With Coast Down Three-Point Safety Belts Speedometer Odometer State-Of-Charge Meter BATTERY Type: Lithium Ion Number of Modules: 48

200

Mean Flow Evolution of a Baroclinically Unstable Potential Vorticity Front  

Science Conference Proceedings (OSTI)

Quasi-linear theory and numerical models are used to study the mean flow modification of a two-layer shallow water baroclinically unstable flow as a function of Rossby number. This flow has an upper-layer potential vorticity front overlying a ...

Emmanuel Boss; Lu Anne Thompson

1999-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Dynamics of Potential Vorticity Fronts and Eddy Detachment  

Science Conference Proceedings (OSTI)

The formation and detachment of quasi-geostrophic eddies in a 1˝ layer jet is studied using a piecewise uniform potential vorticity model. A vorticity front separates the two pieces, and thus the jet has cusplike character. The evolution of large ...

L. J. Pratt; Melvin E. Stern

1986-06-01T23:59:59.000Z

202

(front end fuel cycle) 2.1 (CANDU  

E-Print Network (OSTI)

2 (front end fuel cycle) 2.1 (CANDU: CANada Deuterium Uranium; . ( 2.2) . 70-80% , (uranium concentrate) . () 2.1 . 2.2 2.3 #12; 2; . Mine Car Load Skip Geiger Counter 8"~3/2"" . (2

Hong, Deog Ki

203

Observation of Atmospheric Fronts Using Raman Lidar Moisture Measurements  

Science Conference Proceedings (OSTI)

This paper presents the results of a field program using a ground-based Raman lidar system to observe changes in moisture profiles as a cold and a warm front passed over the NASA/Goddard Space Flight Center in Greenbelt, Maryland. The lidar ...

S. H. Melfi; D. Whiteman; R. Ferrare

1989-09-01T23:59:59.000Z

204

the Front Line of Medicine to Prevent Needless Work Disability  

E-Print Network (OSTI)

Preparing the Front Line of Medicine to Prevent Needless Work Disability: Private 4. Free on-line CME; "Medical Rounds" in a talk show format 3. Free live;6 Approaches 1. Sessions at exis9ng medical educa9on events 2. Offer of on-line CME training

205

Front and backside processed thin film electronic devices  

DOE Patents (OSTI)

This invention provides methods for fabricating thin film electronic devices with both front- and backside processing capabilities. Using these methods, high temperature processing steps may be carried out during both frontside and backside processing. The methods are well-suited for fabricating back-gate and double-gate field effect transistors, double-sided bipolar transistors and 3D integrated circuits.

Yuan, Hao-Chih (Madison, WI); Wang, Guogong (Madison, WI); Eriksson, Mark A. (Madison, WI); Evans, Paul G. (Madison, WI); Lagally, Max G. (Madison, WI); Ma, Zhenqiang (Middleton, WI)

2010-10-12T23:59:59.000Z

206

On the propagation of a coupled saturation and pressure front  

SciTech Connect

Using an asymptotic technique, valid for a medium with smoothly varying heterogeneity, I derive an expression for the velocity of a propagating, coupled saturation and pressure front. Due to the nonlinearity of the governing equations, the velocity of the propagating front depends upon the magnitude of the saturation and pressure changes across the front in addition to the properties of the medium. Thus, the expression must be evaluated in conjunction with numerical reservoir simulation. The propagation of the two-phase front is governed by the background saturation distribution, the saturation-dependent component of the fluid mobility, the porosity, the permeability, the capillary pressure function, the medium compressibility, and the ratio of the slopes of the relative permeability curves. Numerical simulation of water injection into a porous layer saturated with a nonaqueous phase liquid indicates that two modes of propagation are important. The fastest mode of propagation is a pressure-dominated disturbance that travels through the saturated layer. This is followed, much later, by a coupled mode with a large saturation change. These two modes are also observed in a simulation using a heterogeneous porous layer. A comparison between the propagation times estimated from the results of the numerical simulation and predictions from the asymptotic expression indicates overall agreement.

Vasco, D. W.

2010-12-01T23:59:59.000Z

207

Benthic Observations on the Madeira Abyssal Plain: Fronts  

Science Conference Proceedings (OSTI)

Analysis of data from a mooring with five vector-averaging current meters between 10 and 70 m above the bed of the Madeira Abyssal Plain reveals the existence of narrow regions with relatively large gradients of potential temperature, or “fronts.”...

S. A. Thorpe

1983-08-01T23:59:59.000Z

208

A FRONT END DESIGN FOR THE ADVANCED PHOTON SOURCE  

E-Print Network (OSTI)

X-ray sources on next generation low emittance/high brilliance synchrotrons such as the 7-GeV Advanced Photon Source (APS) (1) have unique properties which directly affect the design of the front end of the beam line. The most striking of these are the large peak photon power densities

P. J. Viccaro

1988-01-01T23:59:59.000Z

209

Move-to-Front, Distance Coding, and Inversion Frequencies revisited  

Science Conference Proceedings (OSTI)

Move-to-Front, Distance Coding and Inversion Frequencies are three simple and effective techniques used to process the output of the Burrows-Wheeler Transform. In this paper we provide the first complete comparative analyses of these techniques, establishing ... Keywords: Burrows-Wheeler Transform, Data Compression, Empirical entropy

Travis Gagie; Giovanni Manzini

2010-06-01T23:59:59.000Z

210

Front and backside processed thin film electronic devices  

Science Conference Proceedings (OSTI)

This invention provides thin film devices that have been processed on their front- and backside. The devices include an active layer that is sufficiently thin to be mechanically flexible. Examples of the devices include back-gate and double-gate field effect transistors, double-sided bipolar transistors and 3D integrated circuits.

Evans, Paul G. (Madison, WI); Lagally, Max G. (Madison, WI); Ma, Zhenqiang (Middleton, WI); Yuan, Hao-Chih (Lakewood, CO); Wang, Guogong (Madison, WI); Eriksson, Mark A. (Madison, WI)

2012-01-03T23:59:59.000Z

211

Kinematic and Moisture Characteristics of a Nonprecipitating Cold Front Observed during IHOP. Part I: Across-Front Structures  

Science Conference Proceedings (OSTI)

A wide array of ground-based and airborne instrumentation is used to examine the kinematic and moisture characteristics of a nonprecipitating cold front observed in west-central Kansas on 10 June 2002 during the International H2O Project (IHOP). ...

Katja Friedrich; David E. Kingsmill; Cyrille Flamant; Hanne V. Murphey; Roger M. Wakimoto

2008-01-01T23:59:59.000Z

212

Radio frequency circuits for wireless receiver front-ends  

E-Print Network (OSTI)

The beginning of the 21st century sees great development and demands on wireless communication technologies. Wireless technologies, either based on a cable replacement or on a networked environment, penetrate our daily life more rapidly than ever. Low operational power, low cost, small form factor, and function diversity are the crucial requirements for a successful wireless product. The receiver??s front-end circuits play an important role in faithfully recovering the information transmitted through the wireless channel. Bluetooth is a short-range cable replacement wireless technology. A Bluetooth receiver architecture was proposed and designed using a pure CMOS process. The front-end of the receiver consists of a low noise ampli?er (LNA) and mixer. The intermediate frequency was chosen to be 2MHz to save battery power and alleviate the low frequency noise problem. A conventional LNA architecture was used for reliability. The mixer is a modi?ed Gilbert-cell using the current bleeding technique to further reduce the low frequency noise. The front-end draws 10 mA current from a 3 V power supply, has a 8.5 dB noise ?gure, and a voltage gain of 25 dB and -9 dBm IIP3. A front-end for dual-mode receiver is also designed to explore the capability of a multi-standard application. The two standards are IEEE 802.11b and Bluetooth. They work together making the wireless experience more exciting. The front-end is designed using BiCMOS technology and incorporating a direct conversion receiver architecture. A number of circuit techniques are used in the front-end design to achieve optimal results. It consumes 13.6 mA from a 2.5 V power supply with a 5.5 dB noise ?gure, 33 dB voltage gain and -13 dBm IIP3. Besides the system level contributions, intensive studies were carried out on the development of quality LNA circuits. Based on the multi-gated LNA structure, a CMOS LNA structure using bipolar transistors to provide linearization is proposed. This LNA con?guration can achieve comparable linearity to its CMOS multi-gated counterpart and work at a higher frequency with less power consumption. A LNA using an on-chip transformer source degeneration is proposed to realize input impedance matching. The possibility of a dual-band cellular application is studied. Finally, a study on ultra-wide band (UWB) LNA implementation is performed to explore the possibility and capability of CMOS technology on the latest UWB standard for multimedia applications.

Xin, Chunyu

2004-08-01T23:59:59.000Z

213

Front-end utility rate updates | OpenEI Community  

Open Energy Info (EERE)

Front-end utility rate updates Front-end utility rate updates Home > Groups > Utility Rate Rmckeel's picture Submitted by Rmckeel(297) Contributor 13 February, 2013 - 14:28 Utility Rates A few utility rate updates worth noting. We used to have a limit of 100 for results returned on the utility gateway. That has been increased, along with a few UI updates. There is now a 15em height window (sorry if that's too technical) to browse results, so all the hundreds of results don't extend the page. For the naming page however, perhaps the long list is preferred? I'm willing to tweak these heights, as well as have separate heights if it is requested for the public view and the editor view. Improvement to have results show within the block instead of outside of. Minor increase in results width on editor page.

214

Tracking thermal fronts with temperature-sensitive, chemically reactive tracers  

DOE Green Energy (OSTI)

Los Alamos is developing tracer techniques using reactive chemicals to track thermal fronts in fractured geothermal reservoirs. If a nonadsorbing tracer flowing from the injection to production well chemically reacts, its reaction rate will be a strong function of temperature. Thus the extent of chemical reaction will be greatest early in the lifetime of the system, and less as the thermal front progresses from the injection to production well. Early laboratory experiments identified tracers with chemical kinetics suitable for reservoirs in the temperature range of 75 to 100/sup 0/C. Recent kinetics studies have focused on the kinetics of hydrolysis of derivatives of bromobenzene. This class of reactions can be used in reservoirs ranging in temperature from 150 to 275/sup 0/C, which is of greater interest to the geothermal industry. Future studies will include laboratory adsorption experiments to identify possibly unwanted adsorption on granite, development of sensitive analytical techniques, and a field demonstration of the reactive tracer concept.

Robinson, B.A.; Birdsell, S.A.

1987-01-01T23:59:59.000Z

215

Laser supported solid state absorption fronts in silica  

SciTech Connect

We develop a model based on simulation and experiment that explains the behavior of solid-state laser-supported absorption fronts generated in fused silica during high intensity (up to 5GW/cm{sup 2}) laser exposure. We find that the absorption front velocity is constant in time and is nearly linear in laser intensity. Further, this model can explain the dependence of laser damage site size on these parameters. This behavior is driven principally by the temperature-activated deep sub band-gap optical absorptivity, free electron transport and thermal diffusion in defect-free silica for temperatures up to 15,000K and pressures < 15GPa. The regime of parameter space critical to this problem spans and extends that measured by other means. It serves as a platform for understanding general laser-matter interactions in dielectrics under a variety of conditions.

Carr, C W; Bude, J D

2010-02-09T23:59:59.000Z

216

Episodic Dust Events of Utah’s Wasatch Front and Adjoining Region  

Science Conference Proceedings (OSTI)

Episodic dust events cause hazardous air quality along Utah’s Wasatch Front and dust loading of the snowpack in the adjacent Wasatch Mountains. This paper presents a climatology of episodic dust events of the Wasatch Front and adjoining region ...

W. James Steenburgh; Jeffrey D. Massey; Thomas H. Painter

2012-09-01T23:59:59.000Z

217

An Investigation of an Arctic Front with a Vertically Nested Mesoscale Model  

Science Conference Proceedings (OSTI)

A vertically mesoscale regional numerical weather prediction model is used to simulate an arctic front. The front was observed during the Arctic Cyclone Expedition of 1984. The regional model employs a unique vertical nesting scheme in which the ...

William T. Thompson; Stephen D. Burk

1991-02-01T23:59:59.000Z

218

Cold Fronts with and without Prefrontal Wind Shifts in the Central United States  

Science Conference Proceedings (OSTI)

Time series of cold fronts from stations in the central United States possess incredible variety. For example, time series of some cold fronts exhibit a sharp temperature decrease coincident with a pressure trough and a distinct wind shift. Other ...

David M. Schultz

2004-08-01T23:59:59.000Z

219

The Development of the Piedmont Front and Associated Outbreak of Severe Weather on 13 March 1986  

Science Conference Proceedings (OSTI)

An investigation was conducted of the mesoscale evolution of a quasi-stationary front, termed the Piedmont front owing to its location through the central Carolinas, and an associated outbreak of severe weather on 13 March 1986. Space-time ...

Steven Businger; William H. Bauman III; Gerald F. Watson

1991-09-01T23:59:59.000Z

220

Low-Frequency Variability in the Midlatitude Baroclinic Atmosphere Induced by an Oceanic Thermal Front  

Science Conference Proceedings (OSTI)

This study examines the flow induced by an east–west-oriented oceanic thermal front in a highly idealized baroclinic model. Previous work showed that thermal fronts could produce energetic midlatitude jets in an equivalent-barotropic atmosphere ...

Yizhak Feliks; Michael Ghil; Eric Simonnet

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Two Types of Surface Wind Response to the East China Sea Kuroshio Front  

Science Conference Proceedings (OSTI)

Effects of the sea surface temperature (SST) front along the East China Sea Kuroshio on sea surface winds at different time scales are investigated. In winter and spring, the climatological vector wind is strongest on the SST front while the ...

Jing-Wu Liu; Su-Ping Zhang; Shang-Ping Xie

2013-11-01T23:59:59.000Z

222

Mesoscale Subduction at the Antarctic Polar Front Driven by Baroclinic Instability  

Science Conference Proceedings (OSTI)

A study of mesoscale subduction at the Antarctic Polar Front (PF) is conducted by use of hydrographic data from a high-resolution, quasi-synoptic survey of the front. The geostrophic velocity and isopycnal potential vorticity (PV) fields are ...

Alberto C. Naveira Garabato; Harry Leach; John T. Allen; Raymond T. Pollard; Volker H. Strass

2001-08-01T23:59:59.000Z

223

Spectral Evolution of the Continuum and Disc Line in Dipping in GRO J1655-40  

E-Print Network (OSTI)

The discovery is reported of emission features in the X-ray spectrum of GRO J1655-40 obtained using Rossi-XTE on 1997, Feb 26. The features have been fitted firstly by two Gaussian lines, which in four spectra have average energies of 5.85+/-0.08 keV and 7.32+/-0.13 keV, strongly suggestive that these are the red- and blueshifted wings of an iron disc line from material with velocity ~0.33 c. The blue wing is apparently less bright than expected for a disc line subject to Doppler boosting, however, known absorption in the spectrum of GRO J1655-40 at energies between ~7 and 8 keV can reduce the apparent brightness of the blue wing. The spectra have also been fitted well using the full relativistic disc line model of Laor, plus an absorption line. This gives a restframe energy between 6.4 and 6.8 keV indicating that the line is from highly ionized iron K_alpha. The Laor model also shows that the line originates at radii extending from ~10 Schwarzschild radii (r_S) outwards. The line is direct evidence for the black hole nature of the compact object. The continuum is well described by dominant disc blackbody emission plus Comptonized emission. During dipping, spectral evolution is well modelled by allowing progressive covering of the disc blackbody and simple absorption of the Comptonized emission showing that the thermal emission is more extended. Acceptable fits are only obtained by including the disc line in the covering term, indicating that it originates in the same inner disc region as the thermal continuum. Dip ingress times and durations are used to provide the radius of the disc blackbody emitter as 170-370 r_S, and the radius of the absorber.

M. Balucinska-Church

2001-01-22T23:59:59.000Z

224

A turnstile mechanism for fronts propagating in fluid flows  

E-Print Network (OSTI)

We consider the propagation of fronts in a periodically driven flowing medium. It is shown that the progress of fronts in these systems may be mediated by a turnstile mechanism akin to that found in chaotic advection. We first define the modified ("active") turnstile lobes according to the evolution of point sources across a transport boundary. We then show that the lobe boundaries may be constructed from stable and unstable \\emph{burning invariant manifolds}---one-way barriers to front propagation analogous to traditional invariant manifolds for passive advection. Because the burning invariant manifolds (BIMs) are one-dimensional curves in a three-dimensional ($xy\\theta$) phase space, their projection into $xy$-space exhibits several key differences from their advective counterparts: (lobe) areas are not preserved, BIMs may self-intersect, and an intersection between stable and unstable BIMs does not map to another such intersection. These differences must be accommodated in the correct construction of the new turnstile. As an application, we consider a lobe-based treatment protocol for protecting an ocean bay from an invading algae bloom.

John R. Mahoney; Kevin A. Mitchell

2013-05-22T23:59:59.000Z

225

Occluded Fronts and the Occlusion Process: A Fresh Look at Conventional Wisdom  

Science Conference Proceedings (OSTI)

Traditionally, the formation of an occluded front during the occlusion process in extratropical cyclones has been viewed as the catch-up of a faster-moving cold front to a slower-moving warm front separating the warm-sector air from the low center, as ...

David M. Schultz; Geraint Vaughan

2011-04-01T23:59:59.000Z

226

GASLESS COMBUSTION FRONTS WITH HEAT LOSS ANNA GHAZARYAN, STEPHEN SCHECTER, AND PETER L. SIMON  

E-Print Network (OSTI)

GASLESS COMBUSTION FRONTS WITH HEAT LOSS ANNA GHAZARYAN, STEPHEN SCHECTER, AND PETER L. SIMON Abstract. For a model of gasless combustion with heat loss, we use geometric singular perturbation theory to show existence of traveling combustion fronts. We show that the fronts are nonlinearly stable

Schecter, Stephen

227

Towards front-tracking based on conservation in two space dimensions III, tracking interfaces  

Science Conference Proceedings (OSTI)

This is the third paper in the series of our conservative front-tracking method. In this paper, we describe how our method tracks fluid interfaces in multi-fluid flows. Two important ingredients in our conservative front-tracking method in tracking fluid ... Keywords: Conservative front-tracking, Fluid interface, Numerical surface dissipation, Velocity and pressure equilibrium

Mohammed Aman Ullah, Wenbin Gao, De-Kang Mao

2013-06-01T23:59:59.000Z

228

Analysis of a Surface Front during the Early Summer Rainy Season over Taiwan  

Science Conference Proceedings (OSTI)

A case study of a relatively dry front during TAMEX IOP-4 is presented. At 0000 UTC 27 May, the broad cloud band extended from the China plain and southern Japan to east of 150°E, along and north of the surface front. This front possessed ...

Yi-Leng Chen; Yu-Xia Zhang; Norman B-F. Hui

1989-05-01T23:59:59.000Z

229

Effects of curvature and compressibility on the stability of thermal fronts  

Science Conference Proceedings (OSTI)

The stability of subsonic thermal fronts against corrugation is analyzed and an exact dispersion relation is obtained taking into account the effects of the curvature of the distorted front as well as the compressibility of the gas. At a certain value of the Mach number ahead of the thermal front, unstable rates show a maximum; these rates drop to zero when a Chapman-Jouguet regime is established behind heat fronts. It is shown that curvature effects tend to stabilize conductive heat fronts propagating in a compressible gas.

Ibanez S, Miguel H.; Bessega L, Maria C.; Shchekinov, Yuri [Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de los Andes, Apartado 26, Ipostel, La Hechicera, Merida (Venezuela); Centro de Fisica Teorica y Computacional, Escuela de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, Caracas (Venezuela); Department of Physics, University of Rostov, Rostov on Don, 34409 (Russian Federation)

2006-06-15T23:59:59.000Z

230

Instrument Front-Ends at Fermilab During Run II  

SciTech Connect

The optimization of an accelerator relies on the ability to monitor the behavior of the beam in an intelligent and timely fashion. The use of processor-driven front-ends allowed for the deployment of smart systems in the field for improved data collection and analysis during Run II. This paper describes the implementation of the two main systems used: National Instruments LabVIEW running on PCs, and WindRiver's VxWorks real-time operating system running in a VME crate processor.

Meyer, Thomas; Slimmer, David; Voy, Duane; /Fermilab

2011-07-13T23:59:59.000Z

231

Protective coatings for front surface reflectors. Phase I, final report  

DOE Green Energy (OSTI)

Silicone resins were evaluated as protective coatings for front surface aluminum and silver reflectors. The solar weighted hemispherical reflectances and specular reflectances of float glass squares metallized with silver and aluminum and protected with silicone coatings were measured. The float glass squares metallized with silver and aluminum were highly reflective. The total reflectances of the silver samples were 5 to 7% higher than the aluminized samples. The resin coated aluminum samples were much more specular than the silver samples. Coupling agents used to improve the adhesion of the protective silicone resin coating to the silver surface adversely affected the specularities.

Dennis, W.E.

1979-09-01T23:59:59.000Z

232

Multilayer coatings for the EUVL front-end test bed  

SciTech Connect

Good illumination uniformity at the mask and wafer planes, and high wafer thoroughput in the EUVL front-end test bed facility at LLNL require graded period multilayer (ML) coatings on several of the optics. The ML deposition was accomplished using a newly developed deposition technique which avoids the use of {open_quotes}uniformity masks{close_quotes} to define the spatial dependence of the ML period variation. The capabilities of the process in providing the specified ML coatings are discussed for both EUVL condenser and imaging systems.

Vernon, S.P.; Carey, M.J.; Gaines, D.P.; Weber, F.J.

1995-01-19T23:59:59.000Z

233

Energy Loss at Propagating Jamming Fronts in Granular Gas Clusters  

E-Print Network (OSTI)

We explore the initial moments of impact between two dense granular clusters in a two-dimensional geometry. The particles are composed of solid CO$_{2}$ and are levitated on a hot surface. Upon collision, the propagation of a dynamic "jamming front" produces a distinct regime for energy dissipation in a granular gas in which the translational kinetic energy decreases by over 90%. Experiments and associated simulations show that the initial loss of kinetic energy obeys a power law in time, $\\Delta E=-Kt^{3/2}$, a form that can be predicted from kinetic arguments.

Justin C. Burton; Peter Y. Lu; Sidney R. Nagel

2013-06-12T23:59:59.000Z

234

Using Cepheids to determine the galactic abundance gradient. III.First results for the outer disc  

E-Print Network (OSTI)

As a continuation of our previous work, which concerned the radial abundance distribution in the galactic disc over the distances 4-10 kpc this paper presents the first results on the metallicicty in the outer disc (RG > 10 kpc). Based on high-resolution spectra obtained for 19 distant Cepheids we sampled galactocentric distances from 10 to 12 kpc. Combined with the results of our previous work on the inner and middle parts of the galactic disc, the present data enable one to study the structure of the radial abundance distribution over a large baseline. In particular, we find indications of a discontinuity in the radial abundance distribution for iron as well as a number of the other elements. The discontinuity is seen at a galactocentric distance RG = 10 kpc. This finding supports the results reported earlier by Twarog et al. (1997).

S. M. Andrievsky; V. V. Kovtyukh; R. E. Luck; J. R. D. Lepine; W. J. Maciel; Yu. V. Beletsky

2002-08-02T23:59:59.000Z

235

Target selection for the SUNS and DEBRIS surveys for debris discs in the solar neighbourhood  

E-Print Network (OSTI)

Debris discs - analogous to the Asteroid and Kuiper-Edgeworth belts in the Solar system - have so far mostly been identified and studied in thermal emission shortward of 100 um. The Herschel space observatory and the SCUBA-2 camera on the James Clerk Maxwell Telescope will allow efficient photometric surveying at 70 to 850 um, which allow for the detection of cooler discs not yet discovered, and the measurement of disc masses and temperatures when combined with shorter wavelength photometry. The SCUBA-2 Unbiased Nearby Stars (SUNS) survey and the DEBRIS Herschel Open Time Key Project are complimentary legacy surveys observing samples of ~500 nearby stellar systems. To maximise the legacy value of these surveys, great care has gone into the target selection process. This paper describes the target selection process and presents the target lists of these two surveys.

Phillips, N M; Dent, W R F; Matthews, B C; Holland, W S; Wyatt, M C; Sibthorpe, B

2009-01-01T23:59:59.000Z

236

Reduction of chemical networks. II. Analysis of the fractional ionisation in protoplanetary discs  

E-Print Network (OSTI)

(abridged) We analyse the evolution of the fractional ionisation in a steady-state protoplanetary disc with a vertical temperature gradient and with gas-grain chemistry including surface reactions. The ionisation due to stellar X-rays, stellar and interstellar UV radiation, cosmic rays and radionuclide decay is taken into account. Using our reduction schemes as a tool for the analysis, we isolate small sets of chemical reactions that reproduce the evolution of the ionisation degree at representative disc locations with an accuracy of 50%-100%. Column densities of key molecules are calculated and compared to the results of other recent studies and observational data.

D. Semenov; D. Wiebe; Th. Henning

2004-03-23T23:59:59.000Z

237

Light-Front Holography and QCD Hadronization at the Amplitude Level  

E-Print Network (OSTI)

Light-front holography allows hadronic amplitudes in the AdS/QCD fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The AdS coordinate z is identified with an invariant light-front coordinate zeta which separates the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schrodinger equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. A new method for computing the hadronization of quark and gluon jets at the amplitude level using AdS/QCD light-front wavefunctions is outlined.

Stanley J. Brodsky; Guy de Teramond

2009-01-07T23:59:59.000Z

238

Burning A Disc Using InfraRecorder On the PC desktop, double click on the Accessories and Utilities folder.  

E-Print Network (OSTI)

Burning A Disc Using InfraRecorder On the PC desktop, double click on the Accessories and Utilities to burn. For Word, Excel, PDFs, etc., select Data Disc and CD or DVD as appropriate. At the next screen the pane to the upper left allows you to maneuver to the location of the file(s) you wish to burn. The pane

Kim, Duck O.

239

Evolutionary algorithm for the neutrino factory front end design  

Science Conference Proceedings (OSTI)

The Neutrino Factory is an important tool in the long-term neutrino physics program. Substantial effort is put internationally into designing this facility in order to achieve desired performance within the allotted budget. This accelerator is a secondary beam machine: neutrinos are produced by means of the decay of muons. Muons, in turn, are produced by the decay of pions, produced by hitting the target by a beam of accelerated protons suitable for acceleration. Due to the physics of this process, extra conditioning of the pion beam coming from the target is needed in order to effectively perform subsequent acceleration. The subsystem of the Neutrino Factory that performs this conditioning is called Front End, its main performance characteristic is the number of the produced muons.

Poklonskiy, Alexey A.; /Michigan State U.; Neuffer, David; /Fermilab

2009-01-01T23:59:59.000Z

240

Commissioning of the SNS front-end systems at Berkeley Lab  

E-Print Network (OSTI)

COMMISSIONING OF THE SNS FRONT-END SYSTEMS AT BERKELEY LAB*Details of other MEBT commissioning efforts, especiallywere provided by LANL. Commissioning topics included beam

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Front Row (left to right): Bryan Reed, Wayne King, Nigel Browning ...  

DTEM – Team Members: Front Row (left to right): Bryan Reed, Wayne King, Nigel Browning, Judy Kim, Michael Armstrong Back Row (left to right): Thomas LaGrange ...

242

Recursion relations and scattering amplitudes in the light-front formalism  

E-Print Network (OSTI)

The fragmentation functions and scattering amplitudes are investigated in the framework of light-front perturbation theory. It is demonstrated that, the factorization property of the fragmentation functions implies the recursion relations for the off-shell scattering amplitudes which are light-front analogs of the Berends-Giele relations. These recursion relations on the light-front can be solved exactly by induction and it is shown that the expressions for the off-shell light-front amplitudes are represented as a linear combinations of the on-shell amplitudes. By putting external particles on-shell we recover the scattering amplitudes previously derived in the literature.

Christian A. Cruz-Santiago; Anna M. Stasto

2013-08-05T23:59:59.000Z

243

Factors controlling streambed coverage of Didymosphenia geminata in two regulated streams in the Colorado Front Range  

E-Print Network (OSTI)

of dissolved substances from a Colorado mountain watershed.11: CDOT, 2009. Colorado Department of Transportation.two regulated streams in the Colorado Front Range Matthew P.

Miller, Matthew P.; McKnight, Diane M.; Cullis, James D.; Greene, Alicia; Vietti, Kristin; Liptzin, Daniel

2009-01-01T23:59:59.000Z

244

MHV Fleet Testing - Maintenance Sheet for 2010 Smart Fortwo  

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

472012 47,544 Changed oil and filter 64.33 4112012 47,840 Replaced left front tire (labor) 45.00 4122012 47,847 Replaced front brake pads, adjusted rear brake shoes...

245

MSC response to pH levels found in degenerating intervertebral discs  

Science Conference Proceedings (OSTI)

Painful degenerative disc disease is a major health problem and for successful tissue regeneration, MSCs must endure and thrive in a harsh disc microenvironment that includes matrix acidity as a critical factor. MSCs were isolated from bone marrow of Sprague-Dawley rats from two different age groups (<1 month, n = 6 and 4-5 months, n = 6) and cultured under four different pH conditions representative of the healthy, mildly or severely degenerated intervertebral disc (pH 7.4, 7.1, 6.8, and 6.5) for 5 days. Acidity caused an inhibition of aggrecan, collagen-1, and TIMP-3 expression, as well as a decrease in proliferation and viability and was associated with a change in cell morphology. Ageing had generally minor effects but young MSCs maintained greater mRNA expression levels. As acidic pH levels are typical of increasingly degenerated discs, our findings demonstrate the importance of early interventions and predifferentiation when planning to use MSCs for reparative treatments.

Wuertz, Karin [School of Engineering, University of Vermont, Burlington, Vermont (United States); Spine Research Group, Competence Center for Applied Biotechnology and Molecular Medicine, University of Zurich, Zurich (Switzerland)], E-mail: wuertz@cabmm.uzh.ch; Godburn, Karolyn; Iatridis, James C. [School of Engineering, University of Vermont, Burlington, Vermont (United States)

2009-02-20T23:59:59.000Z

246

Tidal disruptions in circumbinary discs (I): Star formation, dynamics, and binary evolution  

E-Print Network (OSTI)

In our current interpretation of the hierarchical structure of the universe it is well established that galaxies collide and merge with each other during their lifetime. If massive black holes (MBHs) reside in galactic centres, we expect them to form binaries in galactic nuclei surrounded by a circumbinary disc. If cooling is efficient enough, the gas in the disc will clump and trigger stellar formation in situ. In this first paper we address the evolution of the binary under the influence of the newly formed stars, which form individually and also clustered. We use SPH techniques to evolve the gas in the circumbinary disc and to study the phase of star formation. When the amount of gas in the disc is negligible, we further evolve the system with a high-accurate direct-summation $N-$body code to follow the evolution of the stars, the innermost binary and tidal disruption events (TDEs). For this, we modify the direct N-body code to (i) include treatment of TDEs and to (ii) include "gas cloud particles" that mimic the gas, so that the stellar clusters do not disolve when we follow their infall on to the MBHs. We find that the amount of stars disrupted by either infalling stellar clusters or individual stars is as large as 10^{-4}/yr per binary, higher than expected for typical galaxies.

Pau Amaro-Seoane; Patrick Brem; Jorge Cuadra

2012-12-11T23:59:59.000Z

247

The Interruption of Alpine Foehn by a Cold Front. Part I: Observations  

E-Print Network (OSTI)

in Inn and Wipp Valley Temperature slope profile Doppler wind lidar in Wipp Valley #12;6 of 13 Case study study Wipp Valley: AWS network Pot. Temp. and Wind ­ Hovmoeller diagram Strong and warm foehn in the lower Wipp Valley Western Inn-Valley gust front enters Wipp Valley Cold front propagates southward

Gohm, Alexander

248

Higher-order differencing for phase-front propagation in geothermal systems  

DOE Green Energy (OSTI)

We are testing higher-order differencing total variation diminishing schemes implemented in the reservoir simulator TOUGH2 to reduce numerical dispersion of phase fronts in geothermal flow problems. The schemes are called total variation diminishing because they employ flux limiters to prevent spurious oscillations that sometimes occur with other higher-order differencing schemes near sharp fronts. Thus it appears that total variation diminishing schemes rely on an implicit assumption that the overall variability of advected quantities stays constant or diminishes with time. We use the Leonard total variation diminishing scheme in two special problems designed to test the applicability of the scheme for cases where this implicit assumption is violated. In the first problem, we investigate the isothermal propagation of a phase front in a composite porous medium where phase saturation increases as the front enters the second medium. In the second problem, we investigate the propagation of a phase front where boiling increases the saturation difference across the front as it propagates. In the composite porous medium problem, we find that spurious phase saturations can arise if the weighting scheme is based on relative permeability; for weighting based on phase saturation, no such oscillation arises. In the boiling front propagation problem, the front position is highly sensitive to weighting scheme, and the Leonard total variation diminishing scheme is more accurate than upstream weighting because it decreases numerical dispersion in the thermal energy equation.

Oldenburg, Curtis; Pruess, Karsten

1998-01-09T23:59:59.000Z

249

Fronts Formed by Obliquely Reflecting Internal Waves at a Sloping Boundary  

Science Conference Proceedings (OSTI)

A characteristic of internal waves reflecting from sloping boundaries is that they form fronts that travel with the component of the phase speed of the waves up the boundary. The strength of the fronts is assessed by estimating the magnitude of ...

S. A. Thorpe

1999-09-01T23:59:59.000Z

250

Large-Scale Response of the Pacific Ocean Subarctic Front to Momentum Transfer: A Numerical Study  

Science Conference Proceedings (OSTI)

A numerical four-layer hydrodynamical model is implemented to investigate the role the atmosphere exerts on the dynamics of the subarctic front. While the effect of the westerly winds causes a southward shift of the front, the effect of a ...

Alejandro Camerlengo

1982-10-01T23:59:59.000Z

251

PHYSICS RESULTS OF THE NSLS-II LINAC FRONT END TEST STAND  

Science Conference Proceedings (OSTI)

The Linac Front End Test Stand (LFETS) was installed at the Source Development Laboratory (SDL) in the fall of 2011 in order to test the Linac Front End. The goal of these tests was to test the electron source against the specifications of the linac. In this report, we discuss the results of these measurements and the effect on linac performance.

Fliller R. P.; Gao, F.; Yang, X.; Rose, J.; Shaftan, T.; Piel, C

2012-05-20T23:59:59.000Z

252

A front-tracking method for computation of interfacial flows with soluble surfactants  

Science Conference Proceedings (OSTI)

A finite-difference/front-tracking method is developed for computations of interfacial flows with soluble surfactants. The method is designed to solve the evolution equations of the interfacial and bulk surfactant concentrations together with the incompressible ... Keywords: Buoyancy-driven flow, Drop cleavage, Front-tracking method, Soluble surfactant

Metin Muradoglu; Gretar Tryggvason

2008-02-01T23:59:59.000Z

253

Discrete Event Front-tracking Simulation of a Physical Fire-spread Model  

Science Conference Proceedings (OSTI)

Simulation of moving interfaces such as a fire front usually requires resolution of a large-scale and detailed domain. Such computing involves the use of supercomputers to process the large amount of data and calculations. This limitation is mainly due ... Keywords: DEVS, asynchronous, discrete events, envelope, fire spread, flame, forest, front tracking, interface, simulation

Jean-Baptiste Filippi; Frédéric Morandini; Jacques Henri Balbi; David Rc Hill

2010-10-01T23:59:59.000Z

254

Two Types of Surface Wind Response to the East China Sea Kuroshio Front  

Science Conference Proceedings (OSTI)

Effects of the sea surface temperature (SST) front along the East China Sea Kuroshio on sea surface winds at different time scales are investigated. In winter and spring, the climatological vector wind is strongest right on the SST front while the ...

Jing-Wu Liu; Su-Ping Zhang; Shang-Ping Xie

255

Electrical double layers at shock fronts in glow discharges and afterglows  

Science Conference Proceedings (OSTI)

This paper examines the propagation of spark-generated shockwaves (1.0front in these weakly-ionized, nonmagnetized, collisional plasmas. We used a microwave hairpin resonator to measure the electron number density, and, for all cases, we measured an increase in the electron number density at the shock front. By comparing the increase in electron number density at the shock front in the active discharge and in the afterglow, we conclude that electrons with a temperature much greater than room temperature can be compressed at the shock front. The ratio of electron number density before and after the shock front can be approximately predicted using the Rankine-Hugoniot relationship. The large gradient in electron density, and hence a large gradient in the flux of charged species, created a region of space-charge separation, i.e., a double layer, at the shock front. The double layer balances the flux of charged particles on both sides of the shock front. The double layer voltage drop was measured in the current-carrying discharge using floating probes and compared with previous models. As well, we measured argon 1s{sup 5} metastable-state density and demonstrate that metastable-state neutral species can be compressed across a shock front and approximately predicted using the Rankine-Hugoniot relationship.

Siefert, Nicholas S. [Air Force Research Laboratory, Wright Patterson, Ohio 45433 (United States)

2010-12-15T23:59:59.000Z

256

Finescale Vertical Structure of a Cold Front as Revealed by an Airborne Doppler Radar  

Science Conference Proceedings (OSTI)

In the afternoon of 24 May 2002, a well-defined and frontogenetic cold front moved through the Texas panhandle. Detailed observations from a series of platforms were collected near the triple point between this cold front and a dryline boundary.

Bart Geerts; Rick Damiani; Samuel Haimov

2006-01-01T23:59:59.000Z

257

Mineral paragenesis and textures associated with sandstone-hosted roll-front uranium deposits, NW China  

E-Print Network (OSTI)

Mineral paragenesis and textures associated with sandstone-hosted roll-front uranium deposits, NW, People's Republic of China c Northwest Institute of Uranium Geology, China National Nuclear Corporation, Wuyiyi and Shihongtan sandstone-hosted roll-front uranium deposits, northwest China. The mineralization

Fayek, Mostafa

258

Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern China  

E-Print Network (OSTI)

Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern Available online 25 January 2005 Abstract We show evidence that the primary uranium minerals, uraninite-front uranium deposits, Xinjiang, northwestern China were biogenically precipitated and psuedomorphically

Fayek, Mostafa

259

Real-Time Detection of Split Fronts Using Mesoscale Models and WSR-88D Radar Products  

Science Conference Proceedings (OSTI)

A structured methodology for detecting the presence of split cold fronts in an operational forecast environment is developed and applied to a case in which a split front passed over a region of cold air damming in the southeastern United States. ...

Steven E. Koch

2001-02-01T23:59:59.000Z

260

Upper-Level Frontogenesis: Two Case Studies from the FRONTS 87 Experiment  

Science Conference Proceedings (OSTI)

This study describes the structure of two cold fronts observed during the European experiment FRONTS 87. The selection of these two particular cases is based on the existence of well-marked upper-level features, such as strong jet streams, upper-...

Konstantinos Lagouvardos; Vassiliki Kotroni

1995-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Silicon Solar Cells with Front Hetero-contact and Aluminum Alloy Back Junction (Poster)  

DOE Green Energy (OSTI)

The objectives of this report are: (1) to apply industrial back Al process in efficient n-wafer cells with a-Si:H front surface passivation; and (2) to evaluate the surface recombination velocity (SRV) of the a-Si:H passivated front surface with different surface preparation procedures.

Yuan, H.-C.; Page, M. R.; Iwaniczko, E.; Xu, Y.; Roybal, L.; Wang, Q.; Branz, H. M.; Meier, D. L.

2008-05-01T23:59:59.000Z

262

Trapping of a Coastal Density Front by the Bottom Boundary Layer  

Science Conference Proceedings (OSTI)

The dynamics of a surface-to-bottom density front on a uniformly sloping continental shelf and the role of density advection in the bottom boundary layer are examined using a three-dimensional, primitive equation numerical model. The front is ...

David C. Chapman; Steven J. Lentz

1994-07-01T23:59:59.000Z

263

Microscopic Examination of a Corrosion Front in Spent Nuclear Fuel  

Science Conference Proceedings (OSTI)

Spent uranium oxide nuclear fuel hosts a variety of trace chemical constituents, many of which must be sequestered from the biosphere during fuel storage and disposal. In this paper we present synchrotron x-ray absorption spectroscopy and microscopy findings that illuminate the resultant local chemistry of neptunium and plutonium within spent uranium oxide nuclear fuel before and after corrosive alteration in an air-saturated aqueous environment. We find the plutonium and neptunium in unaltered spent fuel to have a +4 oxidation state and an environment consistent with solid-solution in the UO{sub 2} matrix. During corrosion in an air-saturated aqueous environment, the uranium matrix is converted to uranyl U(VI)O{sub 2}{sup 2+} mineral assemblage that is depleted in plutonium and neptunium relative to the parent fuel. At the corrosion front interface between intact fuel and the uranyl-mineral corrosion layer, we find evidence of a thin ({approx}20 micrometer) layer that is enriched in plutonium and neptunium within a predominantly U{sup 4+} environment. Available data for the standard reduction potentials for NpO{sup 2+}/Np{sup 4+} and UO{sub 2}{sup 2+}/U{sup 4+} couples indicate that Np(IV) may not be effectively oxidized to Np(V) at the corrosion potentials of uranium dioxide spent nuclear fuel in air-saturated aqueous solutions. Neptunium is an important radionuclide in dose contribution according to performance assessment models of the proposed U. S. repository at Yucca Mountain, Nevada. A scientific understanding of how the UO{sub 2} matrix of spent nuclear fuel impacts the oxidative dissolution and reductive precipitation of neptunium is needed to predict its behavior at the fuel surface during aqueous corrosion. Neptunium would most likely be transported as aqueous Np(V) species, but for this to occur it must first be oxidized from the Np(IV) state found within the parent spent nuclear fuel [1]. In the immediate vicinity of the spent fuel's surface the redox and nucleation behavior is likely to promote/enhance nucleation of NpO{sub 2} and Np{sub 2}O{sub 5}. Alternatively, Np may be incorporated into uranyl (UO{sub 2}{sup 2+}) alteration phases [2]. In some cases, less-soluble elements such as plutonium will be enriched near the surface of the corroding fuel [3]. We have used focused synchrotron x-rays from the MRCAT beam line at the Advanced Photon Source (APS) at Argonne National Lab to examine a specimen of spent nuclear fuel that had been subject to 10 years of corrosion testing in an environment of humid air and dripping groundwater at 90 C [4]. We find evidence of a region, approximately 20 microns in thickness, enriched in plutonium and neptunium at the corrosion front that exists between the uranyl silicate alteration mineral rind and the unaltered uranium oxide fuel (Figures 1 and 2). The uranyl silicate is itself found to be depleted in these transuranic elements relative to their abundance relative to uranium in the parent fuel. This suggests a low mobility of these components owing to a resistance to oxidize further in the presence of a UO{sub 2}{sup 2+}/U{sup 4+} couple [5].

J.A> Fortner; A.J. Kropf; R.J. Finch; J.C. Cunnane

2006-06-20T23:59:59.000Z

264

Observations of the Sea-Breeze Front during CaPE. Part II: Dual-Doppler and Aircraft Analysis  

Science Conference Proceedings (OSTI)

The three-dimensional kinematic structures of offshore and onshore flow sea-breeze fronts observed during the CaPE experiment are shown using high resolution dual-Doppler and aircraft data. The fronts interact with horizontal convective rolls (...

Nolan T. Atkins; Roger M. Wakimoto; Tammy M. Weckwerth

1995-04-01T23:59:59.000Z

265

SiGe receiver front ends and flip-chip integrated wideband antennas for millimeter-wave passive imaging  

E-Print Network (OSTI)

SiGe wideband 77-GHz and 94-GHz front end receivers with integrated antennas for passive imaging have been designed and characterized. These front end systems exhibit wideband performance with the highest gain and lowest ...

Powell, Johnna, 1980-

2009-01-01T23:59:59.000Z

266

A Simple Model of the Formation and Maintenance of the Shelf/Slope Front in the Middle Atlantic Bight  

Science Conference Proceedings (OSTI)

The strong salinity and temperature gradients across the shelf/slope front in the Middle Atlantic Bight often compensate such that the cross-front density gradient is nearly eliminated. The suggests that the density field may not be as ...

David C. Chapman

1986-07-01T23:59:59.000Z

267

Magnetohydrodynamic Simulations of the Formation of Cold Fronts in Clusters of Galaxies including Heat Conduction  

E-Print Network (OSTI)

Recent Chandra observations of clusters of galaxies revealed the existence of a sharp ridge in the X-ray surface brightness where the temperature drops across the front. This front is called the cold front. We present the results of two-dimensional magnetohydrodynamic simulations of the time evolution of a dense subcluster plasma moving in a cluster of galaxies. Anisotropic heat conduction along the magnetic field lines is included. In the models without magnetic fields, the numerical results indicate that the heat conduction from the hot ambient plasma heats the cold dense plasma of the subcluster and diffuses out the cold front. When magnetic fields exist in a cluster of galaxies, however, cold fronts can be maintained because the heat conduction across the magnetic field lines is suppressed. We found that, even when the magnetic fields in a cluster of galaxies are disordered, heat conduction across the front is restricted because the magnetic field lines are stretched along the front. Numerical results reproduced the X-ray intensity distribution observed in the A3667 cluster of galaxies.

Naoki Asai; Naoya Fukuda; Ryoji Matsumoto

2004-04-07T23:59:59.000Z

268

Light-Front Holography, AdS/QCD, and Hadronic Phenomena  

E-Print Network (OSTI)

AdS/QCD, the correspondence between theories in a modified five-dimensional anti-de Sitter space and confining field theories in physical space-time, provides a remarkable semiclassical model for hadron physics. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. We identify the AdS coordinate $z$ with an invariant light-front coordinate $\\zeta$ which separates the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schr\\"odinger equation with a confining potential which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The mapping of electromagnetic and gravitational form factors in AdS space to their corresponding expressions in light-front theory confirms this correspondence. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. The distinction between static structure functions, such as the probability distributions computed from the square of the light-front wavefunctions, versus dynamical structure functions which include the effects of rescattering, is emphasized. A new method for computing the hadronization of quark and gluon jets at the amplitude level, an event amplitude generator, is outlined.

Stanley J. Brodsky; Guy F. de Teramond

2009-09-22T23:59:59.000Z

269

Front Vehicle Setup Information Downloadable Dynamometer Database (D  

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

Chevrolet Volt- 20F Chevrolet Volt- 20F Test cell location Front Vehicle Setup Information Downloadable Dynamometer Database (D 3 )- Test Summary Sheet Vehicle architecture EREV Vehicle dynamometer Input Document date 8/7/2013 Advanced Powertrain Research Facility Test weight [lb] Target A [lb] 4000 28.66 Target B [lb/mph] Target C [lb/mph^2] -0.0132 0.0202 Revision Number 3 Notes: Test Fuel Information Fuel type EPA Tier II EEE Fuel density [g/ml] Fuel Net HV [BTU/lbm] 0.743 18490 T e s t I D [ # ] C y c l e C o l d s t a r t ( C S t ) H o t s t a r t [ H S t ] D a t e T e s t C e l l T e m p [ C ] T e s t C e l l R H [ % ] T e s t C e l l B a r o [ i n / H g ] V e h i c l e c o o l i n g f a n s p e e d : S p e e d M a t c h [ S M ] o r c o n s t a n t s p e e d [ C S ] S o l a r L a m p s [ W / m 2 ] V e i c l e C l i m a t e C o n t r o l s e t t i n g s H o o d P o s i t i o n [ U p ] o r [ C l o s e d ] W i n d o w P o s i t i o n [ C l o s e d ] o r [ D o w n ] C y c l e D i s t a n c e [ m i ] C y c l e F u

270

Testing Oxygen Reduction Reaction Activity with the Rotating Disc Electrode Technique  

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

Testing Oxygen Reduction Reaction Activity Testing Oxygen Reduction Reaction Activity with the Rotating Disc Electrode Technique Date: Tuesday, March 12, 2013 Innovation for Our Energy Future Shyam S. Kocha: NREL Yannick Garsany: EXCET/NRL Deborah Myers: ANL https://www1.eere.energy.gov/hydrogenandfuelcells/webinars.html Outline 1) Background 2) Experimental Aspects of RDE Testing 3) Basic Measurement Technique & Analysis 4) Parameters Affecting RDE Activity Measurements 1) Impact of Film Deposition & Drying Techniques 2) Impact of Ink Formulation 3) Impact of Nafion Incorporation 4) Impact of particle size effects 5) Correlation with MEA data 5) Electrocatalyst Durability using RDE Measurements 6) Summary 2 Background PEMFC MEA Thin-film RDE Trends of activity and durability in Rotating Disc Electrode (RDE)

271

Unifying disc-jet behaviour in X-ray binaries: an optical/IR approach  

E-Print Network (OSTI)

Synchrotron emission from jets produced by X-ray binaries can be detected at optical and infrared (IR) frequencies. I show that optical/IR colour-magnitude diagrams of the outbursts of nine X-ray binaries successfully separate thermal disc emission from non-thermal jet emission, in both black hole and neutron star sources. A heated single-temperature blackbody is able to reproduce the observed relations between colour and magnitude, except when excursions are made to a redder colour than expected, which is due to jet emission. The general picture that is developed is then incorporated into the unified picture of disc-jet behaviour in black hole X-ray binaries. At a given position of a source in the X-ray hardness-intensity diagram, the radio, IR and optical properties can be inferred. Similarly, it is possible to predict the X-ray and radio luminosities and spectral states from optical/IR monitoring.

David M. Russell; Dipankar Maitra; Rob P. Fender; Fraser Lewis

2008-11-18T23:59:59.000Z

272

Free motion around black holes with discs or rings: between integrability and chaos - I  

E-Print Network (OSTI)

Geodesic dynamics is regular in the fields of isolated stationary black holes. However, due to the presence of unstable periodic orbits, it easily becomes chaotic under various perturbations. Here we examine what amount of chaoticity is induced in Schwarzschild space-time by a presence of an additional source. Following astrophysical motivation, we specifically consider thin rings or discs lying symmetrically around the hole, and describe the total field in terms of exact static and axially symmetric solutions of Einstein's equations. The growth of chaos in time-like geodesic motion is illustrated on Poincar\\'e sections, on time series of position or velocity and their Fourier spectra, and on time evolution of the orbital `latitudinal action'. The results are discussed in dependence on the mass and position of the ring/disc and on geodesic parameters (energy and angular momentum). In the Introduction, we also add an overview of the literature.

O. Semerák; P. Suková

2012-11-17T23:59:59.000Z

273

AN EMPIRICAL FORMULA FOR THE DISTRIBUTION FUNCTION OF A THIN EXPONENTIAL DISC  

Science Conference Proceedings (OSTI)

An empirical formula for a Shu distribution function that reproduces a thin disc with exponential surface density to good accuracy is presented. The formula has two free parameters that specify the functional form of the velocity dispersion. Conventionally, this requires the use of an iterative algorithm to produce the correct solution, which is computationally taxing for applications like Markov Chain Monte Carlo model fitting. The formula has been shown to work for flat, rising, and falling rotation curves. Application of this methodology to one of the Dehnen distribution functions is also shown. Finally, an extension of this formula to reproduce velocity dispersion profiles that are an exponential function of radius is also presented. Our empirical formula should greatly aid the efficient comparison of disc models with large stellar surveys or N-body simulations.

Sharma, Sanjib; Bland-Hawthorn, Joss [Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006 (Australia)

2013-08-20T23:59:59.000Z

274

Gas Turbine Superalloy Materials Property Handbook for Stationary Parts and Discs  

Science Conference Proceedings (OSTI)

Published material property data on alloys used in the stationary components, such as combustors, transition pieces, and nozzles (vanes), as well as rotating discs used in land-based gas turbines, is meager and widely scattered in the literature. This handbook provides a comprehensive resource of all available material property data for iron-containing, as well as nickel- and cobalt-based superalloys. Such data are critical for use in remaining life assessment calculations, failure analysis, comparison o...

2002-12-29T23:59:59.000Z

275

Metal dissolution kinetics in organic solvents using rotating ring-disc voltammetry. Final report  

DOE Green Energy (OSTI)

The effect of a two-phased liquid system - composed of geothermal brine and an organic heat transfer fluid - on the stability of materials used in the energy conversion system was investigated. The principle organic liquids used were isobutane and isopentane. The effects of relative fluid velocity on the corrosion behavior of representative construction materials, austenitic stainless steels, nickel, and copper alloy were determined using an autoclave incorporating a rotating ring-disc electrode. 2 refs., 20 figs. (ACR)

Not Available

1985-01-01T23:59:59.000Z

276

Metallurgical Guidebook for Steam Turbine Rotors and Discs, Volume 1: Chemistry, Manufacturing, Service Degradation, Life Assessment , and Repair  

Science Conference Proceedings (OSTI)

This guide is a compilation of information concerning steam turbine rotors and discs. Due to the variety of operating temperatures and conditions involved, factors such as material composition, manufacturing and heat treatment condition methods, and property requirements may differ from one steam turbine to another. Specifically, this guide addresses turbine rotor and disc materials used, vintages, manufacturing history, quality conditions, and chemical and mechanical properties, and it provides utility ...

2009-12-23T23:59:59.000Z

277

Spectral Evolution of the Continuum and Disc Line in Dipping in GRO J1655-40  

E-Print Network (OSTI)

The discovery is reported of emission features in the X-ray spectrum of GRO J1655-40 obtained using Rossi-XTE on 1997, Feb 26. The features have been fitted firstly by two Gaussian lines, which in four spectra have average energies of 5.85+/-0.08 keV and 7.32+/-0.13 keV, strongly suggestive that these are the red- and blueshifted wings of an iron disc line from material with velocity ~0.33 c. The blue wing is apparently less bright than expected for a disc line subject to Doppler boosting, however, known absorption in the spectrum of GRO J1655-40 at energies between ~7 and 8 keV can reduce the apparent brightness of the blue wing. The spectra have also been fitted well using the full relativistic disc line model of Laor, plus an absorption line. This gives a restframe energy between 6.4 and 6.8 keV indicating that the line is from highly ionized iron K_alpha. The Laor model also shows that the line originates at radii extending from ~10 Schwarzschild radii (r_S) outwards. The line is direct evidence for the b...

Balucinska-Church, M

2001-01-01T23:59:59.000Z

278

Propagation of Front Waves in Myelinated Nerve Fibres: New Electrical Transmission Lines Constituted of Linear and Nonlinear Portions  

Science Conference Proceedings (OSTI)

In this paper, the authors examine the propagation of wave fronts in myelinated nerve fibres and applications as electrical transmission lines constituted of linear and nonlinear portions. Numerical simulations show that the front introduced in the nonlinear ... Keywords: Demyelination, Electrical Line, Front Wave, Myelinated Fibre, Regenerative, Remyelination

Aďssatou Mboussi Nkomidio; Paul Woafo

2011-01-01T23:59:59.000Z

279

X-ray irradiation in XTE J1817-330 and the inner radius of the truncated disc in the hard state  

E-Print Network (OSTI)

The key aspect of the very successful truncated disc model for the low/hard X-ray spectral state in black hole binaries is that the geometrically thin disc recedes back from the last stable orbit at the transition to this state. This has recently been challenged by direct observations of the low/hard state disc from CCD data. We reanalyze the Swift and RXTE campaign covering the 2006 outburst of XTE J1817-330 and show that these data actually strongly support the truncated disc model as the transition spectra unambiguously show that the disc begins to recede as the source leaves the disc dominated soft state. The disc radius inferred for the proper low/hard state is less clear-cut, but we show that the effect of irradiation from the energetically dominant hot plasma leads to an underestimate of the disc radius by a factor of 2-3 in this state. This may also produce the soft excess reported in some hard-state spectra. The inferred radius becomes still larger when the potential difference in stress at the inner boundary, increased colour temperature correction from incomplete thermalization of the irradiation, and loss of observable disc photons from Comptonization in the hot plasma are taken into account. We conclude that the inner disc radius in XTE J1817-330 in the low/hard spectral state is at least 6-8 times that seen in the disc dominated high/soft state, and that recession of the inner disc is the trigger for the soft--hard state transition, as predicted by the truncated disc models.

Marek Gierlinski; Chris Done; Kim Page

2008-03-04T23:59:59.000Z

280

DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in  

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

DOE Offers Conditional Loan Guarantee for Front End Nuclear DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho May 20, 2010 - 12:00am Addthis Washington, DC - As part of a broad effort to expand the use of nuclear power in the United States and reduce carbon pollution, U.S. Secretary of Energy Steven Chu announced today the Department's first conditional commitment for a front-end nuclear facility. The $2 billion loan guarantee will support AREVA's Eagle Rock Enrichment Facility near Idaho Falls, Idaho, which will supply uranium enrichment services for the U.S. nuclear power industry. "Increasing uranium enrichment in the United States is critical to the nation's energy and national security," said Secretary Chu. "Existing

Note: This page contains sample records for the topic "front disc brakes" 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

Midtropospheric Anticyclonic Vortex Street Associated with a Cloud Band near a Cold Front  

Science Conference Proceedings (OSTI)

The characteristics and formation mechanism of an anticyclonic vortex street of meso-? scale, which appeared near a cold front around the Ryukyu Islands, Japan, on 11 April 1995, were examined by an analysis of observational data, a numerical ...

Eizi Toyoda; Hiroshi Niino; Kazuhisa Tsuboki; Ryuji Kimura; Masanori Yoshizaki

1999-08-01T23:59:59.000Z

282

Major Cloud Plumes in the Arctic and Their Relation to Fronts and Ice Movement  

Science Conference Proceedings (OSTI)

A study of the movement of orographic cloud plumes from one island to another in the Svalbard-Novaya Zemlya region of the Barents Sea revealed a close association with similar movements of arctic fronts. Strong northerly winds behind arctic ...

Robert W. Fett

1992-06-01T23:59:59.000Z

283

Influences of the Sierra Nevada on Intermountain Cold-Front Evolution  

Science Conference Proceedings (OSTI)

Recent studies indicate that strong cold fronts develop frequently downstream of the Sierra Nevada over the Intermountain West. To help ascertain why, this paper examines the influence of the Sierra Nevada on the rapidly developing Intermountain ...

Gregory L. West; W. James Steenburgh

2011-10-01T23:59:59.000Z

284

Kinematic and Moisture Characteristics of a Nonprecipitating Cold Front Observed during IHOP. Part II: Alongfront Structures  

Science Conference Proceedings (OSTI)

Kinematic and thermodynamic structures of a nonprecipitating cold front observed in west-central Kansas on 10 June 2002 during the International H2O Project (IHOP) are examined with dropsondes and airborne instrumentation that includes Doppler ...

Katja Friedrich; David E. Kingsmill; Cyrille Flamant; Hanne V. Murphey; Roger M. Wakimoto

2008-10-01T23:59:59.000Z

285

Numerical Study of Precipitation Core-Gap Structure along Cold Fronts  

Science Conference Proceedings (OSTI)

The mechanism responsible for the core-gap structure of precipitation along narrow cold-frontal rainbands (NCFRs) is investigated through analyses of idealized cloud-resolving simulations of cold fronts. The control simulation, in which the ...

Masayuki Kawashima

2007-07-01T23:59:59.000Z

286

Influence of the Subtropical Andes on Baroclinic Disturbances: A Cold Front Case Study  

Science Conference Proceedings (OSTI)

The Andes Cordillera produces a significant disruption to the structure and evolution of the weather systems that cross South America. In particular, cold fronts tend to be “channeled” to the north immediately to the east of the Andes, fostering ...

Marcelo E. Seluchi; RenéD. Garreaud; Federico A. Norte; A. Celeste Saulo

2006-11-01T23:59:59.000Z

287

The Orographic Modulation of Pre-Warm-Front Precipitation in Southern New England  

Science Conference Proceedings (OSTI)

Topographic forcing over the hills and small mountains of southern New England plays an important role in determining the distribution of pre-warm-front precipitation from winter cyclones. Upslope regions receive 20–60% more precipitation than do ...

Richard E. Passarelli Jr.; Hannah Boehme

1983-05-01T23:59:59.000Z

288

Forecasting the Impacts of Strong Wintertime Post-Cold Front Winds in the Northern Plains  

Science Conference Proceedings (OSTI)

Strong post-cold front wind events in the northern plains of the United States are a difficult problem for operational forecasters. The various atmospheric ingredients that lead to these events are examined from an operational point of view. ...

Anton F. Kapela; Preston W. Leftwich; Richard Van Ess

1995-06-01T23:59:59.000Z

289

Sensitivity of Mesoscale Gravity Waves to the Baroclinicity of Jet-Front Systems  

Science Conference Proceedings (OSTI)

This study investigates the sensitivity of mesoscale gravity waves to the baroclinicity of the background jet-front systems by simulating different life cycles of baroclinic waves with a high-resolution mesoscale model. Four simulations are made ...

Shuguang Wang; Fuqing Zhang

2007-02-01T23:59:59.000Z

290

Ocean Fronts off California: A New Product from GOES Satellite Data  

E-Print Network (OSTI)

COASTAL OCEAN RESEARCH R/CZ-181: 3.1.2002–2.28.2005 Ocean Fronts off California: A Newsurfers who complain that the ocean is coldest in spring are

Breaker, Laurence

2004-01-01T23:59:59.000Z

291

Applications of AdS/QCD and Light-Front Holography to Baryon Physics  

SciTech Connect

The correspondence between theories in anti-de Sitter space and field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD which has scale invariance at short distances and color confinement at large distances. These equations, for both mesons and baryons, give a very good representation of the observed hadronic spectrum, including a zero mass pion. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The meson and baryon wavefunctions derived from light-front holography and AdS/QCD also have remarkable phenomenological features, including predictions for the electromagnetic form factors and decay constants. The approach can be systematically improved using light-front Hamiltonian methods. Some novel features of QCD for baryon physics are also discussed.

Brodsky, Stanley J.; /SLAC; de Teramond, Guy F.; /Costa Rica U.

2011-08-22T23:59:59.000Z

292

Simulation of chemical reaction fronts in anaerobic digestion of solid waste  

Science Conference Proceedings (OSTI)

A case study for parallelisation of a code for a nonlinear system of evolution equations is presented. It describes the propagation of reaction fronts in anaerobic waste digestion. These occur as a consequence of heterogeneous initial distributions of ...

Hermann J. Eberl

2003-05-01T23:59:59.000Z

293

Mesoscale Modeling of a Cold Front and Its Interaction with a Diurnally Heated Land Mass  

Science Conference Proceedings (OSTI)

A mesoscale numerical model incorporating a detailed planetary boundary-layer scheme, including momentum, heat and moisture exchange with the lower boundary, is used to study the change in structure of a dry summertime front as it moves towards a ...

William L. Physick

1988-11-01T23:59:59.000Z

294

VHF Radar Observations of Gravity-Wave Production by Cold Fronts over Southern Australia  

Science Conference Proceedings (OSTI)

Four extended observational campaigns were conducted during August and November 1988 with an ST (stratosphere–troposphere) radar in southern Australia during the passage of cold fronts over the system, giving around 30 days of three-dimensional ...

Stephen D. Eckermann; Robert A. Vincent

1993-03-01T23:59:59.000Z

295

The Southerly Burster of South Eastern Australia: An Orographically Forced Cold Front  

Science Conference Proceedings (OSTI)

This paper presents an observational study of the “southerly burster”, or “southerly buster”, a particularly intense type of orographically and thermally influenced cold front which occurs in spring and summer along the southern coast of New ...

J. R. Colquhoun; D. J. Shepherd; C. E. Coulman; R. K. Smith; K. McInnes

1985-12-01T23:59:59.000Z

296

On the Movement and Low-Level Structure of Cold Fronts  

Science Conference Proceedings (OSTI)

This paper presents a review of theoretical and observational studies relating to the low-level structure of cold fronts and explores the factors that are pertinent to frontal motion.

Roger K. Smith; Michael J. Reeder

1988-10-01T23:59:59.000Z

297

Downwelling-Front Instability and Eddy Formation in the Eastern Mediterranean  

Science Conference Proceedings (OSTI)

The instability of the downwelling front along the southern coast of Asia Minor is studied with a multimode quasigeostrophic model. Linear analysis shows that the most unstable wave has a length of about 100 km, The wavelength depends only very ...

Yizhak Feliks; Michael Ghil

1993-01-01T23:59:59.000Z

298

What Maintains the SST Front North of the Eastern Pacific Equatorial Cold Tongue?  

Science Conference Proceedings (OSTI)

A coupled ocean–atmosphere regional model suggests a mechanism for formation of a sharp sea surface temperature (SST) front north of the equator in the eastern Pacific Ocean in boreal summer and fall. Meridional convergence of Ekman transport at ...

Simon P. de Szoeke; Shang-Ping Xie; Toru Miyama; Kelvin J. Richards; R. Justin O. Small

2007-06-01T23:59:59.000Z

299

Diapycnal Diffusivity Inferred from Scalar Microstructure Measurements near the New England Shelf/Slope Front  

Science Conference Proceedings (OSTI)

Conductivity microstructure was used to estimate the diapycnal thermal eddy diffusivity KT near the New England shelf/slope front in early August 1997. Two datasets were collected with a towed vehicle. One involved several horizontal tows in and ...

Chris R. Rehmann; Timothy F. Duda

2000-06-01T23:59:59.000Z

300

The Cold Front of 15 April 1994 over the Central United States. Part I: Observations  

Science Conference Proceedings (OSTI)

Detailed observations of the interactions of a cold front and a dryline over the central United States that led to dramatic undulations in the boundary layer, including an undular bore, are investigated using high-resolution water vapor mixing ...

B. B. Demoz; D. O’C. Starr; K. D. Evans; A. R. Lare; D. N. Whiteman; G. Schwemmer; R. A. Ferrare; J. E. M. Goldsmith; S. E. Bisson

2005-06-01T23:59:59.000Z

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


301

A Laboratory Model of Thermocline Depth and Exchange Fluxes across Circumpolar Fronts  

Science Conference Proceedings (OSTI)

A laboratory experiment has been constructed to investigate the possibility that the equilibrium depth of a circumpolar front is set by a balance between the rate at which potential energy is created by mechanical and buoyancy forcing and the ...

Claudia Cenedese; John Marshall; J. A. Whitehead

2004-03-01T23:59:59.000Z

302

Topographic Distortion of a Cold Front over the Snake River Plain and Central Idaho Mountains  

Science Conference Proceedings (OSTI)

The topographic distortion of a cold front over the Snake River Plain (SRP) and central Idaho Mountains on 3 December 1998 is described using high-density surface observations from MesoWest, a collection of meteorological networks over the ...

W. James Steenburgh; Thomas R. Blazek

2001-06-01T23:59:59.000Z

303

Location of the Antarctic Polar Front from AMSR-E Satellite Sea Surface Temperature Measurements  

Science Conference Proceedings (OSTI)

The location of the Southern Ocean polar front (PF) is mapped from the first 3 yr of remotely sensed Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) sea surface temperature (SST) measurements. In agreement with ...

Shenfu Dong; Janet Sprintall; Sarah T. Gille

2006-11-01T23:59:59.000Z

304

Use of Synthetic Aperture Radar in Finescale Surface Analysis of Synoptic-Scale Fronts at Sea  

Science Conference Proceedings (OSTI)

The viability of synthetic aperture radar (SAR) as a tool for finescale marine meteorological surface analyses of synoptic-scale fronts is demonstrated. In particular, it is shown that SAR can reveal the presence of, and the mesoscale and ...

G. S. Young; T. N. Sikora; N. S. Winstead

2005-06-01T23:59:59.000Z

305

The Life Cycle of an Undular Bore and Its Interaction with a Shallow, Intense Cold Front  

Science Conference Proceedings (OSTI)

The evolution of an undular bore and its associated wind shift, spawned by the passage of a shallow surface cold front over the Southern Great Plains of the United States, is examined using surface and remote sensing observations along with ...

Daniel C. Hartung; Jason A. Otkin; Jonathan E. Martin; David D. Turner

2010-03-01T23:59:59.000Z

306

The Life Cycle of Thunderstorm Gust Fronts as Viewed with Doppler Radar and Rawinsonde Data  

Science Conference Proceedings (OSTI)

This paper presents the time-dependent analysis of the thunderstorm gust front with the use of Project NIMROD data. RHI cross sections of reflectivity and Doppler velocity are constructed to determine the entire vertical structure. The life cycle ...

Roger M. Wakimoto

1982-08-01T23:59:59.000Z

307

Observations of a Subtropical Cold Front in a Region of Complex Terrain  

Science Conference Proceedings (OSTI)

The passage of shallow cold fronts during the late spring and early summer months over the island of Taiwan is often accompanied by heavy rainfall and occasional flash flood episodes. Previous studies have emphasized the weak baroclinicity of ...

Stanley B. Trier; David B. Parsons; Thomas J. Matejka

1990-12-01T23:59:59.000Z

308

Identification of Atmospheric Fronts over the Ocean with Microwave Measurements of Water Vapor and Rain  

Science Conference Proceedings (OSTI)

This Paper describes some basic research techniques and algorithms developed to diagnose fronts in cyclonic storms over the ocean with data from satellite-borne microwave radiometers. The need for this research stems from the limited availability ...

Kristina B. Kanaros; Iffekhar Bhatti; Llynn A. Mcmurdie; Grant W. Petty

1989-12-01T23:59:59.000Z

309

The Norwegian IPY–THORPEX: Polar Lows and Arctic Fronts during the 2008 Andřya Campaign  

Science Conference Proceedings (OSTI)

From a weather forecasting perspective, the Arctic poses particular challenges for mainly two reasons: 1) The observational data are sparse and 2) the weather phenomena responsible for severe weather, such as polar lows, Arctic fronts, and orographic ...

J. E. Kristjánsson; I. Barstad; T. Aspelien; I. Fřre; Ř. Godřy; Ř. Hov; E. Irvine; T. Iversen; E. Kolstad; T. E. Nordeng; H. McInnes; R. Randriamampianina; J. Reuder; Ř. Saetra; M. Shapiro; T. Spengler; H. Ólafsson

2011-11-01T23:59:59.000Z

310

Light-Front Quantization of the Polyakov D1 Brane Action With a Scalar Dilaton Field  

E-Print Network (OSTI)

Light-front quantization of the conformally gauge-fixed Polyakov D1 brane action with a scalar dilaton field is studied using the equal light-cone world-sheet time framework.

D. S. Kulshreshtha

2007-11-08T23:59:59.000Z

311

Cold Fronts Aloft and the Forecasting of Precipitation and Severe Weather East of the Rocky Mountains  

Science Conference Proceedings (OSTI)

Brief descriptions are given of four cases that illustrate the important role that cold fronts aloft (CFA) can play in producing significant weather cast of the Rocky Mountains. In all four cases, the CFA, and its associated short wave, were ...

Peter V. Hobbs; John D. Locatelli; Jonathan E. Martin

1990-12-01T23:59:59.000Z

312

Comparative Analysis of Low-Level Cold Fronts: Wavelet, Fourier, and Empirical Orthogonal Function Decompositions  

Science Conference Proceedings (OSTI)

Atmospheric cold fronts observed in the boundary layer represent relatively sharp transition zones between air masses of disparate physical characteristics. Further, wavelike features and/or eddy structures are often observed in conjunction with ...

Nimal Gamage; William Blumen

1993-10-01T23:59:59.000Z

313

Coevolution of inverse cascade and nonlinear heat front in shear flows of strongly coupled Yukawa liquids  

Science Conference Proceedings (OSTI)

Using classical molecular dynamics (MD) simulations, we report on the development and propagation of a nonlinear heat front in parallel shear flows of a strongly coupled Yukawa liquid. At a given coupling strength, a subsonic shear profile is superposed on an equilibrated Yukawa liquid and Kelvin Helmholtz (KH) instability is observed. Coherent vortices are seen to emerge towards the nonlinear regime of the instability. It is seen that while inverse cascade leads to a continuous transfer of flow energy towards the largest scales, there is also a simultaneous transfer of flow energy into the thermal velocities of grains at the smallest scale. The latter is an effect of velocity shear and thus leads to the generation of a nonlinear heat front. In the linear regime, the heat front is seen to propagate at speed much lesser than the adiabatic sound speed of the liquid. Spatio-temporal growth of this heat front occurs concurrently with the inverse cascade of KH modes.

Ashwin, J.; Ganesh, R. [Institute for Plasma Research, Bhat, Gandhinagar 382428, Gujarat (India)

2011-08-15T23:59:59.000Z

314

Commissioning of the SNS front-end systems at Berkeley Lab  

E-Print Network (OSTI)

Results Obtained with the SNS H - Ion Source and LEBT atVarious contributions by SNS authors to these conferenceCOMMISSIONING OF THE SNS FRONT-END SYSTEMS AT BERKELEY LAB*

2002-01-01T23:59:59.000Z

315

The SNS front-end, an injector for a high-power hydrogen-ion accelerator  

E-Print Network (OSTI)

Stockli, R. Welton, and M. White (SNS-ORNL); J. Power and M.VI. REFERENCES N. Holtkamp, “The SNS Linac and Storage Ring:the FES Team, “Status of the SNS Front-End Sys- tems, Paper

Keller, R.

2002-01-01T23:59:59.000Z

316

The Marine Boundary Layer in the Vicinity of an Ocean Front  

Science Conference Proceedings (OSTI)

Aircraft observations obtained during the Frontal Air–Sea Interaction Experiment (FASINEX) are used to investigate the structure of the marine atmospheric boundary layer in the vicinity of an ocean front. A quasi-stationary sea surface ...

David P. Rogers

1989-07-01T23:59:59.000Z

317

Direct Observations of Along-Isopycnal Upwelling and Diapycnal Velocity at a Shelfbreak Front  

Science Conference Proceedings (OSTI)

By mapping the three-dimensional density field while simultaneously tracking a subsurface, isopycnal float, direct observations of upwelling along a shelfbreak front were made on the southern flank of Georges Bank. The thermohaline and bio-...

John A. Barth; Dave Hebert; Andrew C. Dale; David S. Ullman

2004-03-01T23:59:59.000Z

318

A Mean Synoptic View of the Subantarctic Front South of Australia  

Science Conference Proceedings (OSTI)

A mean synoptic view of the subantarctic front (SAF) is obtained from current meter and hydrographic data by averaging absolute and baroclinic velocity measurements in bins defined by a cross-stream coordinate that moves with the current. The ...

Helen E. Phillips; Stephen R. Rintoul

2002-05-01T23:59:59.000Z

319

A New Statistical Modeling Approach to Ocean Front Detection from SST Satellite Images  

Science Conference Proceedings (OSTI)

Ocean fronts are narrow zones of intense dynamic activity that play an important role in global ocean–atmosphere interactions. Owing to their highly variable nature, both in space and time, they are notoriously difficult features to adequately ...

Jo Hopkins; Peter Challenor; Andrew G. P. Shaw

2010-01-01T23:59:59.000Z

320

Relationship between a Weakening Cold Front, Misocyclones, and Cloud Development on 10 June 2002 during IHOP  

Science Conference Proceedings (OSTI)

The finescale structure and evolution of a cold front in the presence of small-scale circulations are examined using overdetermined dual-Doppler syntheses of mobile radar data along with thermodynamic data and cloud imagery collected on 10 June ...

Nettie R. Arnott; Yvette P. Richardson; Joshua M. Wurman; Erik M. Rasmussen

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Experimental evaluation of the in-plane seismic behavior of store-front window systems  

E-Print Network (OSTI)

J. , (1960). Behavior of window panels under in-planeC. , (1997). Behavior of window glass panels duringBehavior of Store-front Window Systems A thesis submitted in

Eva, Charles Almond

2009-01-01T23:59:59.000Z

322

The Stability of Steady Fronts and the Adjoint Method: Nonmodal Frontal Waves  

Science Conference Proceedings (OSTI)

The adjoint method for finding optimal or singular modes is employed for studying the finite time stability of steady, tw0-dimensional atmospheric fronts as represented by the uniform potential vorticity semigeostrophic model.

Alain Joly

1995-09-01T23:59:59.000Z

323

Unstable Waves on Oceanic Fronts: Large Amplitude Behavior and Mean Flow Generation  

Science Conference Proceedings (OSTI)

A primitive equation numerical model is used to study the large amplitude behavior of unstable waves on an oceanic density front, concentrating on a single wave mode corresponding to the fastest growing linear solution. At Small amplitude the ...

Richard A. Wood

1988-05-01T23:59:59.000Z

324

Mesoscale Energy Spectra of Mei-Yu Front System. Part I: Kinetic Energy Spectra  

Science Conference Proceedings (OSTI)

The mesoscale kinetic energy (KE) spectra of Mei-Yu front system are investigated through idealized numerical simulations. In the mature stage, the upper tropospheric KE spectrum resembles a -3 power law for wavelengths between 1000 and 400 km and ...

Jun Peng; Lifeng Zhang; Yu Luo; Yun Zhang

325

The Evolution of an Observed Cold Front. Part II: Mesoscale Dynamics  

Science Conference Proceedings (OSTI)

A detailed analysis is made of a three-dimensional numerical simulation of the evolution of an observed moist frontal system over a 48 h period. The simulated front undergoes an initial period of frontogenetic growth, characterized by an ...

Isidoro Orlanski; Bruce B. Ross

1984-05-01T23:59:59.000Z

326

The Evolution of an Observed Cold Front. Part I. Numerical Simulation  

Science Conference Proceedings (OSTI)

The 48 h evolution of an observed cold front is simulated by a three-dimensional mesoscale-numerical model for a typical springtime synoptic situation over the southeastern United States. The model used in this study employs anelastic equations ...

Bruce B. Ross; Isidoro Orlanski

1982-02-01T23:59:59.000Z

327

A survey of front end modularity as an automotive architecture and its ability to deliver value  

E-Print Network (OSTI)

The partitioning of a system can and will dictate the creative space for a designer or engineer. This thesis will analyze how using a new automotive architecture known as a Front End Module (FEM) can affect a limited ...

Mahé, Vincent R. (Vincent Robert)

2008-01-01T23:59:59.000Z

328

Absolute Transports of Mass and Temperature for the North Atlantic Current– Subpolar Front System  

Science Conference Proceedings (OSTI)

The flow of subtropical waters carried into the northern North Atlantic Ocean by the North Atlantic Current– subpolar front system (NAC–SPF) is an important component of the meridional overturning circulation. These waters become colder and ...

Paula Pérez-Brunius; Tom Rossby; D. Randolph Watts

2004-08-01T23:59:59.000Z

329

A 6-yr Climatology of Fronts Affecting Helsinki, Finland, and Their Boundary Layer Structure  

Science Conference Proceedings (OSTI)

A 6-yr climatology of the frequency, characteristics, and boundary layer structure of synoptic-scale fronts in Helsinki, Finland, was created using significant weather charts and observations from a 327-m-tall mast and from the Station for ...

Victoria A. Sinclair

2013-09-01T23:59:59.000Z

330

Boundary layer convergence induced by strong winds across a midlatitude SST front  

Science Conference Proceedings (OSTI)

Recent studies indicate that midlatitude SST fronts’ influence extends through the marine atmospheric boundary layer (MABL) into the free atmosphere, with implications for climate variability. To better understand the mechanisms of this ocean-to-...

Thomas Kilpatrick; Niklas Schneider; Bo Qiu

331

Variability of the Intertropical Front (ITF) and Rainfall over the West African Sudan–Sahel Zone  

Science Conference Proceedings (OSTI)

The Intertropical Front (ITF) is a fundamental feature of the atmospheric circulation over West Africa. It separates the wedge of warm moist southwesterly monsoon flow off the tropical Atlantic from much hotter and very dry northeasterly wind ...

M. Issa Lélé; Peter J. Lamb

2010-07-01T23:59:59.000Z

332

Low-Frequency Variability in the Midlatitude Atmosphere Induced by an Oceanic Thermal Front  

Science Conference Proceedings (OSTI)

This study examines the flow induced in a highly idealized atmospheric model by an east–west-oriented oceanic thermal front. The model has a linear marine boundary layer coupled to a quasigeostrophic, equivalent- barotropic free atmosphere. The ...

Yizhak Feliks; Michael Ghil; Eric Simonnet

2004-05-01T23:59:59.000Z

333

DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in  

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

DOE Offers Conditional Loan Guarantee for Front End Nuclear DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho DOE Offers Conditional Loan Guarantee for Front End Nuclear Facility in Idaho May 20, 2010 - 12:00am Addthis Washington, DC - As part of a broad effort to expand the use of nuclear power in the United States and reduce carbon pollution, U.S. Secretary of Energy Steven Chu announced today the Department's first conditional commitment for a front-end nuclear facility. The $2 billion loan guarantee will support AREVA's Eagle Rock Enrichment Facility near Idaho Falls, Idaho, which will supply uranium enrichment services for the U.S. nuclear power industry. "Increasing uranium enrichment in the United States is critical to the nation's energy and national security," said Secretary Chu. "Existing

334

The Role of Stratification in the Formation and Maintenance of Shelf-Break Fronts  

Science Conference Proceedings (OSTI)

A mechanism is described for the formation or a front at the edge of a continental shelf in an initially linearly stratified fluid lacking horizontal density gradients. A primitive equation numerical model is used with a specified vertically ...

Glen Gawarkiewicz; David C. Chapman

1992-07-01T23:59:59.000Z

335

Occurrence and Structure of Mesoscale Fronts and Cyclones near Icy Bay, Alaska  

Science Conference Proceedings (OSTI)

When synoptic-scale cyclones stagnate against the mountains of southeast Alaska, a trough extends to the northwest, along the southern Alaskan coast. A front between maritime and continental air masses develops along the coast. During early ...

Michael Reynolds

1983-10-01T23:59:59.000Z

336

Boundary Layer Control of Buoyant Coastal Currents and the Establishment of a Shelfbreak Front  

Science Conference Proceedings (OSTI)

The bottom boundary layer exerts a powerful control over buoyant coastal currents that contact the bottom, providing a mechanism for trapping density fronts along isobaths. Recent observations suggest that this mechanism may play a role in ...

David C. Chapman

2000-11-01T23:59:59.000Z

337

Examination of the Mesoscale Features of the GALE Coastal Front of 24-25 January 1986  

Science Conference Proceedings (OSTI)

The early evolution of a coastal front that formed off the southeast coast of the United States on 24 January 1986 is examined. Satellite and radar imagery together with the intensive surface, upper0air, and aircraft observations available during ...

Allen J. Riordan

1990-02-01T23:59:59.000Z

338

Analysis and Diagnosis of the Composition of Ageostrophic Circulations in Jet-Front Systems  

Science Conference Proceedings (OSTI)

Diagnostic case studies of ageostrophic circulations in upper-tropospheric jet-front systems are presented, using the numerical analyses of the ECMWF model as data sources. The impact of the ECMWF analysis procedure on the retrieved ageostrophic ...

Jean-Pierre Cammas; Daniel Ramond

1989-11-01T23:59:59.000Z

339

On the Front Lines 162 Los Alamos Science Number 23 1995  

E-Print Network (OSTI)

On the Front Lines 162 Los Alamos Science Number 23 1995 I n 1943, the Manhattan Project. Baumbach, S. Fried, P. L. Kirk and, R. S. Rosenfels (Manhattan Project Report CK-1143, December 1943

Massey, Thomas N.

340

Potential Vorticity and Vertical Velocity at the Iceland-Fćrśs Front  

Science Conference Proceedings (OSTI)

Using data from high-resolution surveys of the Iceland- Fćrśs Front, the authors have calculated synoptic maps of the geostrophic velocity, vorticity, and potential vorticity on isopycnal surfaces. The data have also been used to diagnose the ...

J. T. Allen; D. A. Smeed

1996-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Non-Adiabatic Effects on Combustion Front Propagation in Porous Media: Multiplicity of Steady States  

Science Conference Proceedings (OSTI)

The sustained propagation of combustion fronts in porous media is a necessary condition for the success of an in situ combustion project for oil recovery. Compared to other recovery methods, in situ combustion involves the added complexity of exothermic reactions and temperature-dependent chemical kinetics. In the presence of heat losses, the possibility of ignition and extinction (quenching) exists. In this report, we address the properties of combustion fronts propagating at a constant velocity in the presence of heat losses.

Akkutlu, I. Yucel; Yortsos, Yanis C.

2002-03-11T23:59:59.000Z

342

Influence of p-method finite element parameters on predictions of crack front geometry  

Science Conference Proceedings (OSTI)

The effect of various p-method finite element model parameters on the prediction of planar crack front geometry in three dimensional structures is evaluated. An automatic crack growth method was developed using the commercial software StressCheck coupled ... Keywords: ?, Corner crack, Crack front, Finite element, Mesh, Stress intensity factor, a, b, b/a, c, ctrat, ipr, m, mrat, p-method, trans

Diane Wowk, Kyle Gamble, Ross Underhill

2013-10-01T23:59:59.000Z

343

Wave front fragmentation due to ventricular geometry in a model of the rabbit heart  

Science Conference Proceedings (OSTI)

The role of the heart’s complex shape in causing the fragmentation of activation wave fronts characteristic of ventricular fibrillation (VF) has not been well studied. We used a finite element model of cardiac propagation capable of simulating functional reentry on curved two-dimensional surfaces to test the hypothesis that uneven surface curvature can cause local propagation block leading to proliferation of reentrant wave fronts. We found that when reentry was induced on a flat sheet

Jack M. Rogers

2002-01-01T23:59:59.000Z

344

Coordinate-free description of corrugated flames with realistic density drop at the front  

E-Print Network (OSTI)

The complete set of hydrodynamic equations for a corrugated flame front is reduced to a system of coordinate-free equations at the front using the fact that vorticity effects remain relatively weak even for corrugated flames. It is demonstrated how small but finite flame thickness may be taken into account in the equations. Similar equations are obtained for turbulent burning in the flamelet regime. The equations for a turbulent corrugated flame are consistent with the Taylor hypothesis of stationary external turbulence.

Vitaly Bychkov; Maxim Zaytsev; V'yacheslav Akkerman

2012-10-30T23:59:59.000Z

345

AdS/QCD, Light-Front Holography, and Color Confinement  

E-Print Network (OSTI)

A remarkable holographic feature of dynamics in AdS space in five dimensions is that it is dual to Hamiltonian theory in physical space-time, quantized at fixed light-front time {\\tau} = t+z/c. This light-front holographic principle provides a precise relation between the bound-state amplitudes in AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The fifth dimension coordinate z is dual to the light front variable {\\zeta} describing the invariant separation of the quark constituents. The resulting valence Fock-state wavefunction eigensolutions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schr\\"odinger equation. The soft-wall dilaton profile exp ({\\kappa}^2 {\\zeta}^2) provides a model for the light-front potential which is color-confining and reproduces well the linear Regge behavior of the light-quark hadron spectrum in both L, the orbital angu...

Brodsky, Stanley J

2013-01-01T23:59:59.000Z

346

AdS/QCD and Applications of Light-Front Holography  

SciTech Connect

Light-Front Holography leads to a rigorous connection between hadronic amplitudes in a higher dimensional anti-de Sitter (AdS) space and frame-independent light-front wavefunctions of hadrons in 3 + 1 physical space-time, thus providing a compelling physical interpretation of the AdS/CFT correspondence principle and AdS/QCD, a useful framework which describes the correspondence between theories in a modified AdS5 background and confining field theories in physical space-time. To a first semiclassical approximation, where quantum loops and quark masses are not included, this approach leads to a single-variable light-front Schroedinger equation which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The coordinate z in AdS space is uniquely identified with a Lorentz-invariant coordinate {zeta} which measures the separation of the constituents within a hadron at equal light-front time. The internal structure of hadrons is explicitly introduced and the angular momentum of the constituents plays a key role. We give an overview of the light-front holographic approach to strongly coupled QCD. In particular, we study the photon-to-meson transition form factors (TFFs) F{sub M{gamma}}(Q{sup 2}) for {gamma}{gamma}* {yields} M using light-front holographic methods. The results for the TFFs for the {eta} and {eta}' mesons are also presented. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. A method for computing the hadronization of quark and gluon jets at the amplitude level is outlined.

Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; Cao, Fu-Guang; /Massey U.; de Teramond, Guy F.; /Costa Rica U.

2012-02-16T23:59:59.000Z

347

DiscPOP: Power-aware buffer management for disk accesses  

Science Conference Proceedings (OSTI)

Much research has been conducted on energy efficient cache buffer management for disk based storage systems. Some of them use greedy prefetching technique to artificially increase disk idle intervals if there are a large number of known future requests. ... Keywords: greedy partition, DiscPOP, power-aware buffer management, disk accesses, disk based storage systems, greedy prefetching, I/O access pattern, application pattern, CPU-bound application, energy conservation, efficient prefetching scheme, disk power consumption, performance guarantee, disk reliability, disk characteristic based power-optimal prefetching, energy-efficient cache buffer management, disk I/O system, optimization problem, integer linear programming, divide-and-conquer based offline algorithm

Xiongzi Ge; Dan Feng; David H. C. Du

2011-07-01T23:59:59.000Z

348

Design of the NSLS-II Linac Front End Test Stand  

SciTech Connect

The NSLS-II operational parameters place very stringent requirements on the injection system. Among these are the charge per bunch train at low emittance that is required from the linac along with the uniformity of the charge per bunch along the train. The NSLS-II linac is a 200 MeV linac produced by Research Instruments Gmbh. Part of the strategy for understanding to operation of the injectors is to test the front end of the linac prior to its installation in the facility. The linac front end consists of a 100 kV electron gun, 500 MHz subharmonic prebuncher, focusing solenoids and a suite of diagnostics. The diagnostics in the front end need to be supplemented with an additional suite of diagnostics to fully characterize the beam. In this paper we discuss the design of a test stand to measure the various properties of the beam generated from this section. In particular, the test stand will measure the charge, transverse emittance, energy, energy spread, and bunching performance of the linac front end under all operating conditions of the front end.

Fliller III, R.; Johanson, M.; Lucas, M.; Rose, J.; Shaftan, T.

2011-03-28T23:59:59.000Z

349

Apparatus for characterizing the temporo-spatial properties of a dynamic fluid front and method thereof  

SciTech Connect

Methods and apparatus are described for characterizing the temporal-spatial properties of a dynamic fluid front within a mold space while the mold space is being filled with fluid. A method includes providing a mold defining a mold space and having one or more openings into the mold space; heating a plurality of temperature sensors that extend into the mold space; injecting a fluid into th emold space through the openings, the fluid experiencing a dynamic fluid front while filling the mold space with a fluid; and characterizing temporal-spatial properties of the dynamic fluid front by monitoring a termperature of each of the plurality of heated temperature sensors while the mold space is being filled with the fluid. An apparatus includes a mold defining a mold space; one or more openings for introducing a fluid into th emold space and filling the mold space with the fluid, the fluid experiencing a dynamic fluid front while filling the mold space; a plurality of heated temperature sensors extending into the mold space; and a computer coupled to the plurality of heated temperature sensors for characterizing the temporal-spatial properties of the dynamic fluid front.

Battiste, Richard L

2013-12-31T23:59:59.000Z

350

A comparison of one and two dimensional models of transonic accretion discs around collapsed objects  

E-Print Network (OSTI)

We construct models of the inner part of a transonic adiabatic accretion disc assuming constant specific angular momentum taking the vertical structure fully into account.\\\\ For comparison purposes, we construct the corresponding one dimensional viscous disc models derived under vertical averaging assumptions. The conditions under which a unique location for the critical/sonic point is obtained, given an appropriate set of exterior boundary conditions for these models, is also discussed. This is not unique if the standard '$\\alpha $' prescription with viscous stress proportional to the angular velocity gradient is used.\\\\ We use a simple model to discuss the possible limitations on the form of the viscous stress arising from the requirement that viscous information must travel at a finite speed. Contrary to results in the existing literature, the viscous stress tends to be {\\it increased} rather than reduced for the type of flows we consider in which the angular momentum and angular velocity gradients have opposite signs. However, finite propagation effects may result in a unique location for the sonic point.\\\\ We found good agreement between the radial flow and specific angular momentum profiles in the inner regions of the one dimensional models and those in the equatorial plane for corresponding two dimensional models which may be matched for a range of $\\alpha $ between 0.1 and 10$^{-4}$.

J. C. B. Papaloizou; E. Szuszkiewicz

1994-01-16T23:59:59.000Z

351

Free motion around black holes with discs or rings: between integrability and chaos - II  

E-Print Network (OSTI)

We continue the study of time-like geodesic dynamics in exact static, axially and reflection symmetric space-times describing the fields of a Schwarzschild black hole surrounded by thin discs or rings. In the previous paper, the rise (and decline) of geodesic chaos with ring/disc mass and position and with test particle energy was revealed on Poincar\\'e sections, on time series of position or velocity and their power spectra, and on time evolution of the orbital `latitudinal action'. In agreement with the KAM theory of nearly integrable dynamical systems and with the results observed in similar gravitational systems in the literature, we found orbits of very different degrees of chaoticity in the phase space of perturbed fields. Here we compare selected orbits in more detail and try to classify them according to the characteristics of the corresponding phase-variable time series, mainly according to the shape of the time-series power spectra, and also applying two recurrence methods: the method of `average directional vectors', which traces the directions in which the trajectory (recurrently) passes through a chosen phase-space cell, and the `recurrence-matrix' method, which consists of statistics over the recurrences themselves. All the methods proved simple and powerful, while it is interesting to observe how they differ in sensitivity to certain types of behaviour.

O. Semerák; P. Suková

2012-11-17T23:59:59.000Z

352

Collisionless kinetic regimes for quasi-stationary axisymmetric accretion disc plasmas  

Science Conference Proceedings (OSTI)

This paper is concerned with the kinetic treatment of quasi-stationary axisymmetric collisionless accretion disc plasmas. The conditions of validity of the kinetic description for non-relativistic magnetized and gravitationally bound plasmas of this type are discussed. A classification of the possible collisionless plasma regimes which can arise in these systems is proposed, which can apply to accretion discs around both stellar-mass compact objects and galactic-center black holes. Two different classifications are determined, which are referred to, respectively, as energy-based and magnetic field-based classifications. Different regimes are pointed out for each plasma species, depending both on the relative magnitudes of kinetic and potential energies and the magnitude of the magnetic field. It is shown that in all cases, there can be quasi-stationary Maxwellian-like solutions of the Vlasov equation. The perturbative approach outlined here permits unique analytical determination of the functional form for the distribution function consistent, in each kinetic regime, with the explicit inclusion of finite Larmor radius-diamagnetic and/or energy-correction effects.

Cremaschini, C. [International School for Advanced Studies (SISSA) and INFN, Trieste (Italy); Tessarotto, M. [Department of Mathematics and Geosciences, University of Trieste, Trieste (Italy)

2012-08-15T23:59:59.000Z

353

A Model for Tracking Fronts of Stress-Induced Permeability Enhancement  

E-Print Network (OSTI)

Using an analogy to the classical Stefan problem, we construct evolution equations for the fluid pore pressure on both sides of a propagating stress-induced damage front. Closed form expressions are derived for the position of the damage front as a function of time for the cases of thermally-induced damage as well as damage induced by over-pressure. We derive expressions for the flow rate during constant pressure fluid injection from the surface corresponding to a spherically shaped subsurface damage front. Finally, our model results suggest an interpretation of field data obtained during constant pressure fluid injection over the course of 16 days at an injection site near Desert Peak, NV.

K. C. Lewis; Satish Karra; Sharad Kelkar

2013-05-15T23:59:59.000Z

354

A Model for Tracking Fronts of Stress-Induced Permeability Enhancement  

E-Print Network (OSTI)

Using an analogy to the classical Stefan problem, we construct evolution equations for the fluid pore pressure on both sides of a propagating stress-induced damage front. Closed form expressions are derived for the position of the damage front as a function of time for the cases of thermally-induced damage as well as damage induced by over-pressure. We derive expressions for the flow rate during constant pressure fluid injection from the surface corresponding to a spherically shaped subsurface damage front. Finally, our model results suggest an interpretation of field data obtained during constant pressure fluid injection over the course of 16 days at an injection site near Desert Peak, NV.

Lewis, K C; Kelkar, Sharad

2013-01-01T23:59:59.000Z

355

Report on the value engineering workshop on APS beamline front ends  

SciTech Connect

A formal value engineering evaluation process was developed to address the front end components of the beamlines for the Advanced Photon Source (APS). This process (described in Section 2) involved an information phase, a creative phase, a judgment phase, a development phase, and a recommendation phase. Technical experts from other national laboratories and industry were invited to a two-day Value Engineering Workshop on November 5-6, 1992. The results of this Workshop are described in Section 4. Following the Workshop, various actions by the APS staff led to the redesign of the front end components, which are presented in Sections 5 and 6. The cost benefit analysis is presented in Section 7. It is important of realize that an added benefit of the Workshop was to obtain numerous design evaluations and enhancements of the front end components by experts in the field. As the design work proceeds to Title II completion, the APS staff is including many of these suggestions.

Kuzay, T.

1993-01-01T23:59:59.000Z

356

Measures of the Environmental Footprint of the Front End of the Nuclear Fuel Cycle  

Science Conference Proceedings (OSTI)

Previous estimates of environmental impacts associated with the front end of the nuclear fuel cycle have focused primarily on energy consumption and CO2 emissions. Results have varied widely. Section 2 of this report provides a summary of historical estimates. This study revises existing empirical correlations and their underlying assumptions to fit to a more complete set of existing data. This study also addresses land transformation, water withdrawals, and occupational and public health impacts associated with the processes of the front end of the once-through nuclear fuel cycle. These processes include uranium mining, milling, refining, conversion, enrichment, and fuel fabrication. Metrics are developed to allow environmental impacts to be summed across the full set of front end processes, including transportation and disposition of the resulting depleted uranium.

Brett Carlsen; Emily Tavrides; Erich Schneider

2010-08-01T23:59:59.000Z

357

Characteristics of Medical Research News Reported on Front Pages of Newspapers  

E-Print Network (OSTI)

Background: The placement of medical research news on a newspaper’s front page is intended to gain the public’s attention, so it is important to understand the source of the news in terms of research maturity and evidence level. Methodology/Principal Findings: We searched LexisNexis to identify medical research reported on front pages of major newspapers published from January 1, 2000 to December 31, 2002. We used MEDLINE and Google Scholar to find journal articles corresponding to the research, and determined their evidence level. Of 734 front-page medical research stories identified, 417 (57%) referred to mature research published in peer-reviewed journals. The remaining 317 stories referred to preliminary findings presented at scientific or press meetings; 144 (45%) of those stories mentioned studies that later matured (i.e. were published in journals within 3 years after news coverage). The evidence-level distribution of the 515

William Yuk; Yeu Lai; Trevor Lane

2008-01-01T23:59:59.000Z

358

Alternative Muon Front-end for the International Design Study (IDS)  

E-Print Network (OSTI)

We discuss alternative designs of the muon capture front end of the Neutrino Factory International Design Study (IDS). In the front end, a proton bunch on a target creates secondary pions that drift into a capture channel, decaying into muons. A sequence of RF cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to (nearly) equal central energies, and initiates ionization cooling. This design is affected by limitations on accelerating gradients within magnetic fields. The effects of gradient limitations are explored, and mitigation strategies are presented

Alekou, A; Martini, M; Prior, G; Rogers, C; Stratakis, D; Yoshikawa, C; Zisman, M

2010-01-01T23:59:59.000Z

359

Eastgate seen from the south-east, in front of Harare's glass and concrete towers  

E-Print Network (OSTI)

Eastgate seen from the south-east, in front of Harare's glass and concrete towers #12;Eastgate officesEastgate offices Level two #12;Sections showing the passive cooling system #12;Cooling the office the degree of internal cooling achieved during April 1998 #12;· The termitary model · The termitary is an i f

Behmer, Spencer T.

360

Into the Teeth of the Gale: The Remarkable Advance of a Cold Front at Grand Manan  

Science Conference Proceedings (OSTI)

The afternoon of 30 December 1962 saw the nearly simultaneous arrival at Grand Manan (an island in the Bay of Fundy) of an intense cold front, accompanied by northwesterly gales and snow, and an intense small cyclonic vortex, producing a mild ...

Robert M. Cunningham; Frederick Sanders

1987-10-01T23:59:59.000Z

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


361

The Influence of Canyon Winds on Flow Fields near Colorado's Front Range  

Science Conference Proceedings (OSTI)

A network of sodars was operated in the late summer and fall of 1993 to monitor the occurrence of nocturnal winds from a canyon in Colorado's Front Range near the Rocky Flats Plant and to determine the influence of those winds on the flow fields ...

J. C. Doran

1996-04-01T23:59:59.000Z

362

Average crack front velocity during subcritical fracture propagation in a heterogeneous medium  

E-Print Network (OSTI)

the free energy, and thus the energy barrier, via numerous competing mech- anisms like stress corrosion speed of crack growth with increasing G; a weak stress- sensitive regime II follows where transportAverage crack front velocity during subcritical fracture propagation in a heterogeneous medium

Ampuero, Jean Paul

363

User-centric composition of service front-ends at the presentation layer  

Science Conference Proceedings (OSTI)

The emerge of web services in Service-Oriented Architectures (SOA) within companies or at the global internet offers new ways for the creation of web applications. Even though the composition of services via business processes are covered by existing ... Keywords: UI integration, service composition at the presentation layer, service front-ends

Tobias Nestler; Lars Dannecker; Andreas Pursche

2009-11-01T23:59:59.000Z

364

Baroclinic Eady Wave and Fronts. Part I: Viscous Semigeostrophy and the Impact of Boundary Condition  

Science Conference Proceedings (OSTI)

A two-dimensional viscous semigeostrophic model is developed to study the evolution of the baroclinic Eady wave and fronts with two types (free-slip and nonslip) of boundary conditions. With the free-slip boundary condition, the solution is very ...

Qin Xu; Wei Gu; Jidong Gao

1998-12-01T23:59:59.000Z

365

Research Aircraft Observations and Numerical Simulations of a Warm Front Approaching Vancouver Island  

Science Conference Proceedings (OSTI)

The mesoscale structure of the low-level flow and the character of the turbulence are investigated for a warm front as it approached the prominent terrain of the Pacific Northwest in the vicinity of Vancouver Island. Flight-level and airborne ...

James D. Doyle; Nicholas A. Bond

2001-05-01T23:59:59.000Z

366

On the Formation of Potential-Vorticity Anomalies in Upper-Level Jet-Front Systems  

Science Conference Proceedings (OSTI)

We review and discuss a difference in interpretation of the role of turbulence in modifying the potential-vorticity distribution in the vicinity of upper-level jet-front systems. In the late 1970s, M. A. Shapiro presented observational evidence ...

Daniel Keyser; Richard Rotunno

1990-09-01T23:59:59.000Z

367

Solar cells conversion efficiency maximisation based on sol-gel method and front surface texturisation  

Science Conference Proceedings (OSTI)

This paper presents experiments and evaluations on a new silicon solar cell structure obtained by texturisation of the front surface using silicon micromachining technologies. The textured surface of the solar cell is made in order to reduce frontal ... Keywords: light trapping, micromachining, silicon, sol-gel method, solar cells, texturisation

Lucian Milea; Orest Oltu; Claudius Teodorescu; Verona Muntean; Marius Stoian

2008-07-01T23:59:59.000Z

368

The Energy Spectrum of Fronts: Time Evolution of Shocks in Burgers‚ Equation  

Science Conference Proceedings (OSTI)

Andrews and Hoskins used semigeostrophic theory to argue that the energy spectrum of a front should decay like the ?8/3 power of the wavenumber. They note, however, that their inviscid analysis is restricted to the very moment of breaking; that ...

John P. Boyd

1992-01-01T23:59:59.000Z

369

Electronic-nose for detecting environmental pollutants: signal processing and analog front-end design  

Science Conference Proceedings (OSTI)

Environmental monitoring relies on compact, portable sensor systems capable of detecting pollutants in real-time. An integrated chemical sensor array system is developed for detection and identification of environmental pollutants in diesel and gasoline ... Keywords: ADC, Analog front end, Chopper stabilization, Electronic nose, Feature extraction, Gas sensors

Hyuntae Kim; Bharatan Konnanath; Prasanna Sattigeri; Joseph Wang; Ashok Mulchandani; Nosang Myung; Marc A. Deshusses; Andreas Spanias; Bertan Bakkaloglu

2012-01-01T23:59:59.000Z

370

The Three-Dimensional Circulation near the Eastern North pacific Subtropical Front  

Science Conference Proceedings (OSTI)

The purpose of our study is to describe and compute the large-scale, three-dimensional circulation near the Subtropical Front in the eastern North Pacific along 31°N. This was accomplished through the use of four extensive hydrographic surveys, ...

Pearn P. Niller; Richard W. Reynolds

1984-02-01T23:59:59.000Z

371

Some Two-Layer Models of the Shelf-Slope Front: Geostrophic Adjustment and its Maintenance  

Science Conference Proceedings (OSTI)

Two conceptual models of a two-layered frontal system are presented to study the wintertime shelf-slope front. The first model examines the geostrophic adjustment over a step topography after the fall overturning and applies only over short time ...

Hsien Wang Ou

1983-10-01T23:59:59.000Z

372

A Modeling Case Study of Heavy Rainstorms along the Mei-Yu Front  

Science Conference Proceedings (OSTI)

On 12–13 June 1991, a series of convective rainstorms (defined as mesoscale precipitation systems with rainfall rates exceeding 10 mm h?1) developed successively along the Mei-Yu front. During this event, new rainstorms formed to the east of ...

Shou-Jun Chen; Ying-Hwa Kuo; Wei Wang; Zu-Yu Tao; Bo Cui

1998-09-01T23:59:59.000Z

373

A six-year climatology of fronts affecting Helsinki, Finland and their boundary layer structure  

Science Conference Proceedings (OSTI)

A six-year climatology of the frequency, characteristics, and boundary-layer structure of synoptic-scale fronts in Helsinki, Finland was created using significant weather charts and observations from a 327 m tall mast and from the Station for ...

Victoria A. Sinclair

374

Research Article: Ranking of microRNA target prediction scores by Pareto front analysis  

Science Conference Proceedings (OSTI)

Over the past ten years, a variety of microRNA target prediction methods has been developed, and many of the methods are constantly improved and adapted to recent insights into miRNA-mRNA interactions. In a typical scenario, different methods return ... Keywords: MicroRNAs, Multi-objective optimisation, Pareto front, Target mRNAs

Sudhakar Sahoo; Andreas A. Albrecht

2010-12-01T23:59:59.000Z

375

Light-Like Noncommutativity, Light-Front Quantization and New Light on UV/IR Mixing  

E-Print Network (OSTI)

We revisit the problem of quantizing field theories on noncommutative Moyal spacetime with \\emph{light-like} noncommutativity. To tackle the issues arising from noncommuting and hence nonlocal time, we argue that for this case light-front quantization procedure should be employed. In this appropriate quantization scheme we perform the non-planar loop analysis for the light-like noncommutative field theories. One of the important and peculiar features of light-front quantization is that the UV cutoff of the light-cone Hamiltonian manifests itself as an IR cutoff for the light-cone momentum, $p^+$. Due to this feature, the naive results of covariant quantization for the light-like case allude to the absence of the UV/IR mixing in the light-front quantization. However, by a careful analysis of non-planar loop integrals we show that this is not the case and the UV/IR mixing persists. In addition, we argue in favour of the perturbative unitarity of light-like noncommutative field theories in the light-front quantization scheme.

M. M. Sheikh-Jabbari; A. Tureanu

2010-10-02T23:59:59.000Z

376

Unusually Long Duration, Multiple-Doppler Radar Observations of a Front in a Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Dual-Doppler observations acquired by a network of mobile radars deployed in the Oklahoma panhandle on 3 June 2002 are used to document the kinematic structure and evolution of a front. The data were collected during the International H2O Project ...

John R. Stonitsch; Paul M. Markowski

2007-01-01T23:59:59.000Z

377

Silicon Solar Cells with Front Hetero-Contact and Aluminum Alloy Back Junction: Preprint  

DOE Green Energy (OSTI)

We prototype an alternative n-type monocrystalline silicon (c-Si) solar cell structure that utilizes an n/i-type hydrogenated amorphous silicon (a-Si:H) front hetero-contact and a back p-n junction formed by alloying aluminum (Al) with the n-type Si wafer.

Yuan, H.-C.; Page, M. R.; Iwaniczko, E.; Xu, Y.; Roybal, L.; Wang, Q.; Branz, H. M.; Meier, D. L.

2008-05-01T23:59:59.000Z

378

ATJDITORY MASKING BASED ACOUSTIC FRONT-END FOR ROBUST SPEECH RECOGNITION  

E-Print Network (OSTI)

to the mismatched conditions [15]. Adding white noise to the signal results in an constant addition to the log power the effect of additive noise distortion, white Gaussian noise is added to the speech signal and speech.Paliwal@me.gu.edu.au ABSTRACT This paper presents an acoustic front-end which uses the properties of auditory masking

379

Light-front Holography - A New Approach to Relativistic Hadron Dynamics and Nonperturbative QCD  

Science Conference Proceedings (OSTI)

The holographic mapping of gravity in AdS space to QCD, quantized at fixed light-front time, provides a precise relation between the bound-state amplitudes in the fifth dimension of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. In particular, the elastic and transition form factors of the pion and the nucleons are well described in this framework. The light-front AdS/QCD holographic approach thus gives a frame-independent first approximation of the color-confining dynamics, spectroscopy, and excitation spectra of relativistic light-quark bound states in QCD. More generally, we show that the valence Fock-state wavefunctions of the eigensolutions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schroedinger equation, with an effective confining potential which systematically incorporates the effects of higher quark and gluon Fock states. The proposed method to compute the effective interaction thus resembles the two-particle-irreducible functional techniques used in quantum field theory.

de Teramond, Guy F.; Brodsky, Stanley J.

2012-06-20T23:59:59.000Z

380

Mesoscale Energy Spectra of the Mei-Yu Front System. Part I: Kinetic Energy Spectra  

Science Conference Proceedings (OSTI)

The mesoscale kinetic energy (KE) spectra of the mei-yu front system are investigated through idealized numerical simulations. In the mature stage, the upper-tropospheric KE spectrum resembles a ?3 power law for wavelengths between 1000 and 400 km ...

Jun Peng; Lifeng Zhang; Yu Luo; Yun Zhang

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Diabatic Effects on Late-Winter Cold Front Evolution: Conceptual and Numerical Model Evaluations  

Science Conference Proceedings (OSTI)

The impact of diabatic heating on late winter frontogenesis is evaluated both through conceptual scaling and the use of high-resolution Eta Model simulations of a strong but relatively dry cold surface front that occurred during the Storm-scale ...

William A. Gallus Jr.; Moti Segal

1999-07-01T23:59:59.000Z

382

Norwegian-Type and Cold Front Aloft–Type Cyclones East of the Rocky Mountains  

Science Conference Proceedings (OSTI)

Conventional data and mesoscale model simulations are used to analyze two cyclones that developed east of the Rocky Mountains in June and November 1998. Both cyclones formed when a Pacific cold front overtook a lee trough/dryline east of the ...

John D. Locatelli; Ralph D. Schwartz; Mark T. Stoelinga; Peter V. Hobbs

2002-02-01T23:59:59.000Z

383

The Dependence of Canyon Winds on Surface Cooling and External Forcing in Colorado's Front Range  

Science Conference Proceedings (OSTI)

The atmospheric katabatic flow in the foothills of the Front Range of the Rocky Mountains has been monitored by a network of towers and sodars for several years as part of the ASCOT program. The dependence of the outflow from Coal Creek Canyon on ...

Richard L. Coulter; Paul Gudiksen

1995-06-01T23:59:59.000Z

384

Geographic Window Sizes Applied to Remote Sensing Sea Surface Temperature Front Detection  

Science Conference Proceedings (OSTI)

The effects of using a geographic window size with an existing edge-detection technique for the detection of thermal fronts in sea surface temperature (SST) imagery are investigated. The size of a geographic window is not constant but instead is ...

Scott F. Diehl; Judith W. Budd; David Ullman; Jean-François Cayula

2002-07-01T23:59:59.000Z

385

Semi-flexible gas-insulated transmission line using sandwiched discs for intermittent flexing joints  

DOE Patents (OSTI)

A gas-insulated transmission line includes an outer sheath, an inner conductor, an insulating gas electrically insulating the inner conductor from the outer sheath, and insulating supports insulatably supporting the inner conductor within the outer sheath. The inner conductor is provided with flexibility by the use of main conductor sections which are joined together through a conductor hub section and flexible flexing elements. Stress shields are provided to control the electric field at the locations of the conductor hub sections where the insulating supports are contacting the inner conductor. The flexing elements are formed by sandwiching together, by fusing, a pair of thin hollow discs which are fixedly secured to both the main conductor sections and the conductor hub section. 4 figs.

Kommineni, P.R.

1983-02-15T23:59:59.000Z

386

Semi-flexible gas-insulated transmission line using sandwiched discs for intermittent flexing joints  

DOE Patents (OSTI)

A gas-insulated transmission line includes an outer sheath, an inner conductor, an insulating gas electrically insulating the inner conductor from the outer sheath, and insulating supports insulatably supporting the inner conductor within the outer sheath. The inner conductor is provided with flexibility by the use of main conductor sections which are joined together through a conductor hub section and flexible flexing elements. Stress shields are provided to control the electric field at the locations of the conductor hub sections where the insulating supports are contacting the inner conductor. The flexing elements are formed by sandwiching together, by fusing, a pair of thin hollow discs which are fixedly secured to both the main conductor sections and the conductor hub section.

Kommineni, Prasad R. (Westboro, MA)

1983-02-15T23:59:59.000Z

387

Comparisons and Connections between Mean Field Dynamo Theory and Accretion Disc Theory  

E-Print Network (OSTI)

The origin of large scale magnetic fields in astrophysical rotators, and the conversion of gravitational energy into radiation near stars and compact objects via accretion have been subjects of active research for a half century. Magnetohydrodynamic turbulence makes both problems highly nonlinear, so both subjects have benefitted from numerical simulations.However, understanding the key principles and practical modeling of observations warrants testable semi-analytic mean field theories that distill the essential physics. Mean field dynamo (MFD) theory and alpha-viscosity accretion disc theory exemplify this pursuit. That the latter is a mean field theory is not always made explicit but the combination of turbulence and global symmetry imply such. The more commonly explicit presentation of assumptions in 20th century textbook MFDT has exposed it to arguably more widespread criticism than incurred by 20th century alpha-accretion theory despite complementary weaknesses. In the 21st century however, MFDT has exp...

Blackman, Eric G

2009-01-01T23:59:59.000Z

388

The Formation and Maintenance of Density Fronts on the U.S. Southeastern Continental Shelf during Winter  

Science Conference Proceedings (OSTI)

Density fronts on the U.S. southeastern continental shelf, during winter, am formed by (i) breakdown of the shelf-break front by Gulf Stream meanders or strong southward winds or both, (ii) shoreward intrusion of upper Gulf Stream warm water by ...

Lie-Yauw Oey

1986-06-01T23:59:59.000Z

389

Mesoscale Thermohaline, Sound Velocity and Baroclinic Flow Structure of the Pacific Subtropical Front During the Winter of 1980  

Science Conference Proceedings (OSTI)

The three-dimensional thermohaline. sound velocity and baroclinic flow structure of the. pacific sub-tropical front during January and February 1990 are discussed. The front is meander-like, with a wavelength of 180 km, a wave amplitude of 55 km, ...

Gunnar I. Roden

1981-05-01T23:59:59.000Z

390

Power efficient asynchronous multiplexer for X-ray sensors in medical imaging analog front-end electronics  

Science Conference Proceedings (OSTI)

This paper presents a new power efficient asynchronous multiplexer (MUX) for application in analog front-end electronics (AFE) used in X-ray medical imaging systems. Contrary to typical synchronous MUXes that have to be controlled by a clock, this circuit ... Keywords: Analog front end, Asynchronous circuits, Medical imaging, Multiplexers, X-ray detection

Rafa? D?ugosz; Pierre-André Farine; Kris Iniewski

2011-01-01T23:59:59.000Z

391

VIN# JHMFA36216S019329 Vehicle Specifications  

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

16S019329 Vehicle Specifications Engine: 1.3 L 4-cylinder Electric Motor: 15 kW Battery: NiMH Seatbelt Positions: Five Payload: 968 lbs Features: Front disk brakes wEBD brake...

392

VIN# JHMFA36246S018725 Vehicle Specifications  

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

46S018725 Vehicle Specifications Engine: 1.3 L 4-cylinder Electric Motor: 15 kW Battery: NiMH Seatbelt Positions: Five Payload: 968 lbs Features: Front disk brakes wEBD brake...

393

Survey of Morphologies Formed in the Wake of an Enslaved Phase-Separation Front in Two Dimensions  

E-Print Network (OSTI)

A phase-separation front will leave in its wake a phase-separated morphology that differs markedly from homogeneous phase-separation morphologies. For a purely diffusive system such a front, moving with constant velocity, will generate very regular, non-equilibrium structures. We present here a numerical study of these fronts using a lattice Boltzmann method. In two dimensions these structures are regular stripes or droplet arrays. In general the kind and orientation of the selected morphology and the size of the domains depends on the speed of the front as well as the composition of the material overtaken by the phase-separation front. We present a survey of morphologies as a function of these two parameters. We show that the resulting morphologies are initial condition dependent. We then examine which of the potential morphologies is the most stable. An analytical analysis for symmetrical compositions predicts the transition point from orthogonal to parallel stripes.

E. M. Foard; A. J. Wagner

2011-03-28T23:59:59.000Z

394

Front cover  

Gasoline and Diesel Fuel Update (EIA)

INVESTMENT IN COMMODITIES MARKETS: INVESTMENT IN COMMODITIES MARKETS: POTENTIAL IMPACT ON COMMODITY PRICES & VOLATILITY IIF Commodities Task Force Submission to the G20 September 2011 IIF Commodities Task Force Submission to the G20 Financial Investment in Commodity Markets: Potential Impact on Commodity Prices & Volatility 1 Preface Amidst increasing concerns about global growth prospects and financial market volatility, commodity prices con- tinue to be a focus for policymakers. The French G-20 presidency has made this topic a priority, emphasizing the potential role of financial investment in driving trends in commodity markets. With commodity prices closely linked to inflation trends, particularly in low-income countries where food security is a vital issue, the search for policy tools

395

Front Matter  

Science Conference Proceedings (OSTI)

I am delighted to have the honour to introduce the Proceedings of the Nineteenth European Conference on Artificial Intelligence (ECAI-2010), including the proceedings of the Sixth Conference on Prestigious Applications of Intelligent Systems (PAIS-2010). ...

2010-08-01T23:59:59.000Z

396

Front Matter  

E-Print Network (OSTI)

and 1976, Rhodesia's oil import costs trebled. To financethe regular price for oil. This extra cost for purchasing onand the oil price increase w~re deepened by the cost of

1986-01-01T23:59:59.000Z

397

Front Matter  

E-Print Network (OSTI)

Black Studies. Yashpa l A. Tandon, Ph.D. (London). FormerlyMUSEVENTSGOVERNMENT Yash Tandon THE RISE AND FALL OF TilE1964 a.r 1973, Dr. Tandon was Reader in the Depanment of

n/a, n/a

1987-01-01T23:59:59.000Z

398

Section: Front  

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

GEWEX. One of these joint planning activities culminated in the field deployment of the Pilot Radiation Observation Experiment (PROBE) to Kavieng, Papua New Guinea, as part of...

399

Front Matter  

Science Conference Proceedings (OSTI)

The 12th International Conference on Artificial Intelligence in Education (AIED-2005) is being held July 18--22, 2005, in Amsterdam, the beautiful Dutch city near the sea. AIED-2005 is the latest in an on-going series of biennial conferences in AIED ...

2005-05-01T23:59:59.000Z

400

Temperature Equilibration Behind the Shock Front: an Optical and X-ray Study of RCW 86  

E-Print Network (OSTI)

We study the electron-proton temperature equilibration behind several shocks of the RCW 86 supernova remnant. To measure the proton temperature, we use published and new optical spectra, all from different locations on the remnant. For each location, we determine the electron temperature from X-ray spectra, and correct for temperature equilibration between the shock front and the location of the X-ray spectrum. We confirm the result of previous studies that the electron and proton temperatures behind shock fronts are consistent with equilibration for slow shocks and deviate for faster shocks. However, we can not confirm the previously reported trend of the electron temperature to proton temperature ratio of 1/v^2.

Helder, E A; Bassa, C G

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

TEMPERATURE EQUILIBRATION BEHIND THE SHOCK FRONT: AN OPTICAL AND X-RAY STUDY OF RCW 86  

Science Conference Proceedings (OSTI)

We study the electron-proton temperature equilibration behind several shocks of the RCW 86 supernova remnant. To measure the proton temperature, we use published and new optical spectra, all from different locations on the remnant. For each location, we determine the electron temperature from X-ray spectra, and correct for temperature equilibration between the shock front and the location of the X-ray spectrum. We confirm the result of previous studies that the electron and proton temperatures behind shock fronts are consistent with equilibration for slow shocks and deviate for faster shocks. However, we cannot confirm the previously reported trend of T{sub e}/T{sub p}{proportional_to}1/v{sup 2}{sub s}.

Helder, E. A.; Vink, J. [Astronomical Institute, Utrecht University, P.O. Box 80000, NL-3508 TA Utrecht (Netherlands); Bassa, C. G., E-mail: e.a.helder@astro-uu.nl [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL (United Kingdom)

2011-08-20T23:59:59.000Z

402

In-situ combustion process simulator with a moving-front representation. [THERMS  

Science Conference Proceedings (OSTI)

A description is given of THERMS a new three phase, black-oil simulator for in-situ combustion processes. The model also can simulate steam and hot-water injection operations. To simulate field-scale in-situ combustion projects, THERMS uses experimental data obtained from laboratory combustion-tube runs. Detailed kinetics and thermodynamic relations are not used. The model treats the burning zone as a moving front. The front is viewed not only as a moving heat source, but also as a displacement pump enhancing oil flow. This approach results in a new algorithm. The model has been designed with strongly field-oriented features. Its utility is illustrated by a history-matching study of the South Belridge, CA, dry-combustion pilot test. 11 refs.

Hwang, M.K.; Jines, W.R.; Odeh, A.S.

1982-04-01T23:59:59.000Z

403

The Low-Level Structure and Evolution of a Dry Arctic Front over the Central United States. Part II: Comparison with Theory  

Science Conference Proceedings (OSTI)

This investigation examines the meso- and microscale aspects of the 9 March 1992 cold front that passed through Kansas during the daylight hours. The principal feature of this front is the relatively rapid frontogenesis that occurred. The total ...

William Blumen; Nimal Gamage; Robert L. Grossman; Margaret A. LeMone; L. Jay Miller

1996-08-01T23:59:59.000Z

404

Parametric Study of Front-End Nuclear Fuel Cycle Costs Using Reprocessed Uranium  

Science Conference Proceedings (OSTI)

This study evaluates front-end nuclear fuel cycle costs assuming that uranium recovered during the reprocessing of commercial light-water reactor (LWR) spent nuclear fuel is available to be recycled and used in the place of natural uranium. This report explores the relationship between the costs associated with using a natural uranium fuel cycle, in which reprocessed uranium (RepU) is not recycled, with those associated with using RepU.

2010-01-26T23:59:59.000Z

405

Program on Technology Innovation: Small Torrefaction Plants Front End Engineering and Design  

Science Conference Proceedings (OSTI)

This report is produced under the EPRI Program on Technology Innovation, and analyzes the viability of developing small torrefaction plants, to be locally deployed close to biomass resource areas, to reduce logistic cost associated to hauling wet raw biomass long distances to large centralized facilities, for production of torrefied chips and pellets. Two plant sizes were selected for a Front Engineering and Design Analysis: 1) A 5/tons/hour product capacity and 2) a 2tons/hour product capacity. The torr...

2010-12-23T23:59:59.000Z

406

Mapping Neutral Hydrogen During Reionization with the Ly-alpha Emission from Quasar Ionization Fronts  

E-Print Network (OSTI)

We present a new method to directly map the neutral-hydrogen distribution during the reionization epoch and to constrain the emission properties of the highest-redshift quasars (QSOs). As a tracer of HI, we propose to use the Ly-alpha radiation produced by quasar ionization fronts (I-fronts) that expand in the partially ionized intergalactic medium (IGM) before reionization is complete. These Ly-alpha photons are mainly generated by collisional excitations of hydrogen atoms in the boundary of the rapidly expanding HII region. The observable signal is produced by the part of the I-front that lies behind the QSO with respect to the observer. Combining two radiative transfer models (one for the QSO ionizing radiation and one for the Ly-alpha photons), we estimate the expected Ly-alpha spectral shape and surface brightness (SB) for a large number of configurations where we varied both the properties of the ionizing QSO and of the surrounding medium. We find that the expected signal is observable as a single (broad) emission line with a characteristic width of 100-200 km/s. The expected SB produced at redshift z~6.5 within a fully neutral region (at mean density) by a typical QSO I-front lies in the range $10^{-21}-10^{-20}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$ and decreases proportionally to $(1+z)^2$ for a given QSO age. QSOs with harder spectra may produce a significantly brighter emission at early phases. The signal may cover up to a few hundred square arcmin on the sky and should be already detectable with current facilities by means of moderate/high resolution spectroscopy. The detection of this Ly-alpha emission can shed new light on the reionization history, the age and the emission properties of the highest-redshift QSOs. (abridged)

Sebastiano Cantalupo; Cristiano Porciani; Simon J. Lilly

2007-09-05T23:59:59.000Z

407

High-Level Synthesis of Analog Sensor Interface Front-Ends  

Science Conference Proceedings (OSTI)

In this paper we compare three different methodologies for analog high-level synthesis. Two optimization-based methods-one with simulations in the loop, the other with equations-and a library-based approach are discussed and illustrated with experimental ... Keywords: sensors, analog high-level synthesis, analog sensor interface front-ends, optimization-based methods, library-based approach, radiation detector interface ASIC

S. Donnay; G. Gielen; W. Sansen; W. Kruiskamp; D. Leenaerts; W. Van Bokhoven

1997-03-01T23:59:59.000Z

408

Away from the Range Front: Intra-Basin Geothermal Exploration Geothermal  

Open Energy Info (EERE)

Away from the Range Front: Intra-Basin Geothermal Exploration Geothermal Away from the Range Front: Intra-Basin Geothermal Exploration Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Away from the Range Front: Intra-Basin Geothermal Exploration Project Type / Topic 1 Recovery Act: Geothermal Technologies Program Project Type / Topic 2 Validation of Innovative Exploration Technologies Project Description The project applies the known relationship between fault permeability and the mechanics of rocks under stress to reduce risks in exploration well targeting. Although the concept has been applied before, the project would innovate by dramatically increasing the detail and types of information on the mechanical state of the target area using a variety of low-cost measurements in advance of deep drilling. In addition to the mechanical data, holes into the shallow warm aquifer related to the thermal anomaly will allow analysis of chemical indicators of upflow as a more direct measure of the location of fault permeability.

409

Delayed muons in extensive air showers and double-front showers  

Science Conference Proceedings (OSTI)

The results of a long-term experiment performed in the period between 1995 and 2006 with the aid of the MUON-T underground (20 mwe) scintillation facility arranged at the Tien Shan mountain research station at an altitude of 3340 m above sea level are presented. The time distribution of delayed muons with an energy in excess of 5 GeV in extensive air showers of energy not lower than 106 GeV with respect to the shower front was obtained with a high statistical significance in the delay interval between 30 and 150 ns. An effect of the geomagnetic field in detecting delayed muons in extensive air showers was discovered. This effect leads to the asymmetry of their appearance with respect to the north-south direction. The connection between delayed muons and extensive air showers featuring two fronts separated by a time interval of several tens of to two hundred nanoseconds is discussed. This connection gives sufficient grounds to assume that delayed muons originate from the decays of pions and kaons produced in the second, delayed, front of extensive air showers.

Beisembaev, R. U.; Vavilov, Yu. N., E-mail: yuvavil@mail.ru; Vildanov, N. G.; Kruglov, A. V.; Stepanov, A. V. [Russian Academy of Sciences, Lebedev Institute of Physics (Russian Federation); Takibaev, J. S. [Al-Farabi Kazakh National University (Kazakhstan)

2009-11-15T23:59:59.000Z

410

Thermomechanical analysis of high-heat-load components for the canted-undulator front end.  

SciTech Connect

With the canted undulators operating at 200 mA at closed gap at the Advanced Photon Source in the future, the front end will receive 20.4 kW of total power and 281 kW/mrad{sup 2} of peak power density. Thermal analysis of the front-end high-heat-load components becomes an essential part of the front-end design. An extensive study has been conducted on the thermal design of the photon shutters and fixed masks. A unique dog-bone-shaped cross-section design for the photon shutters was derived to relieve high stress in the corners. The dual-undulator x-ray beams were simulated at several locations on the fixed mask to ensure the worst possible case is considered. Stress analysis on the fixed mask revealed that the maximum stress occurs when beam hits the intersection between the horizontal surface and the corner surface. The details of the analysis procedure are presented, and the failure criteria are discussed.

Jaski, Y.; Trakhtenberg, E.; Collins, J.; Benson, C.; Brajuskovic, B.; Den Hartog, P.

2002-09-20T23:59:59.000Z

411

The Eastern United States Side-Door Cold Front of 22 April 1987: A Case Study of an Intense Atmospheric Density Current  

Science Conference Proceedings (OSTI)

A case study is presented of an unusual cold front that affected the east coast of the United States on 22 April 1987. Noteworthy aspects of this front are its genesis behind a preexisting back-door cold front its propagation to the southwest, ...

Gregory J. Hakim

1992-12-01T23:59:59.000Z

412

Post-Impingement Survival of Juvenile and Adult Fish with a Geiger Multi-Disc Screen: Laboratory Evaluations  

Science Conference Proceedings (OSTI)

This report presents the results of a laboratory study evaluating the survival, injury, and scale loss of fish exposed to a Passavant-Geiger Multi-Disc (Geiger) screen specifically designed to protect juvenile and adult fish. Information in this report increases the performance database for this technology. The data presented provide a basis upon which to estimate the potential for these screens to meet the proposed Environmental Protection Agency (EPA) Clean Water Act §316(b) Existing ...

2013-02-01T23:59:59.000Z

413

Latent Impingement Mortality Assessment of the Geiger Multi-DiscTM Screening System at the Potomac River Generating Station  

Science Conference Proceedings (OSTI)

This report presents the results of a field study evaluating the injury and survival of fish exposed to a Geiger Multi-Disc (Geiger) modified traveling water screen designed to protect juvenile and adult fish. The study was conducted at the Potomac River Generating Station owned by Mirant Potomac River, LLC. Information in this report provides the first performance database for this technology. Also, for the species tested, the data presented provide a basis on which to estimate the potential biological ...

2007-07-23T23:59:59.000Z

414

Metallurgical Guidebook for Steam Turbine Rotors and Discs, Volume 2: Materials Property Database for HP-IP and LP Rotors  

Science Conference Proceedings (OSTI)

As the power plants are aging, many of the components have either surpassed or are nearing their intended design lives. Due to the range of temperatures the steam turbine components areexposed to, material composition, manufacturing and heat treatment methods, and property requirements vary widely. Having the proper knowledge about the vintage, manufacturing history, quality conditions, chemical and mechanical properties, etc., of the rotors and discs become vital when decisions about run, repair, or rep...

2010-12-23T23:59:59.000Z

415

The 12/13 January 1988 Narrow Cold-Frontal Rainband Observed during MFDP/FRONTS 87. Part II: Microphysics  

Science Conference Proceedings (OSTI)

The microphysics of a narrow cold-frontal rainband (NCFR) observed during the MFDP/FRONTS87 experiment is investigated by using a microphysical retrieval model. The equations of evolution of the water substance and of the temperature are solved ...

Virginie Marécal; Daničle Hauser; Frank Roux

1993-04-01T23:59:59.000Z

416

Mapping and Monitoring Large-Scale Ocean Fronts Off the California Coast Using Imagery from the GOES-10 Geostationary Satellite  

E-Print Network (OSTI)

2002. New old frontier: ocean fronts (Editorial). Dyn.Atmos. Oceans 36:1–2. Bernstein, R.L. , L.C. Breaker, and R.satellite imagery of the oceans. IEEE Trans. Geosci. Remote

Breaker, Laurence C.; Mavor, Timothy P.; Broenkow, William W.

2005-01-01T23:59:59.000Z

417

The Subpolar Front of the Japan/East Sea. Part II: Inverse Method for Determining the Frontal Vertical Circulation  

Science Conference Proceedings (OSTI)

An inverse method for inferring vertical velocities from high-resolution hydrographic/velocity surveys is formulated and applied to observations collected at the subpolar front of the Japan/East Sea (JES) taken during several cold-air outbreaks. ...

Leif N. Thomas; Craig M. Lee; Yutaka Yoshikawa

2010-01-01T23:59:59.000Z

418

Modification of the Thermodynamic Structure of the Lower Troposphere by the Evaporation of Precipitation ahead of a Cold Front  

Science Conference Proceedings (OSTI)

The evolution of an oceanic prefrontal subcloud layer of continental origin was examined by analyzing data gathered on the subsynoptic and mesoscale during Phase III of the Australian Cold Fronts Research Program. Characteristics of the ...

B. F. Ryan; K. J. Wilson; E. J. Zipser

1989-01-01T23:59:59.000Z

419

The Influence of Sea Surface Temperature Gradients on Stratiform Cloudiness along the Equatorial Front in the Pacific Ocean  

Science Conference Proceedings (OSTI)

Satellite observations of visible cloudiness and sea surface temperature (SST) are used to test the hypothesis that the configuration of cool low-level winds blowing across a sharp SST front in the equatorial eastern Pacific gives rise to ...

Clara Deser; Susan Wahl; John J. Bates

1993-06-01T23:59:59.000Z

420

A comparison of automated methods of front recognition for climate studies – a case study in south west Western Australia  

Science Conference Proceedings (OSTI)

The identification of extratropical fronts in reanalyses and climate models is an important climate diagnostic that aids dynamical understanding and model verification. This study compares six frontal identification methods which are applied to ...

Pandora Hope; Kevin Keay; Michael Pook; Jennifer Catto; Ian Simmonds; Graham Mills; Peter McIntosh; James Risbey; Gareth Berry

Note: This page contains sample records for the topic "front disc brakes" 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

A Nonclassical Cold Front Observed during COPS-91: Frontal Structure and the Process of Severe Storm Initiation  

Science Conference Proceedings (OSTI)

This case study addresses the issue of gravity current and bore development at surface cold fronts, and the role of these phenomena in the generation of severe frontal convection. The event investigated occurred on 27 April 1991 during the ...

Steven E. Koch; Wallace L. Clark

1999-08-01T23:59:59.000Z

422

Relevance of Surface Energy Budget within Florida Sea-Breeze Front to Cross-Peninsula Rainwater Runoff Gradient  

Science Conference Proceedings (OSTI)

Analysis of surface latent heat flux measurements taken within the sea-breeze front of the coast of Florida during active thunderstorm periods demonstrates an important effect of the timing of coastal storms on the seasonal surface water budget. ...

Harry J. Cooper; Eric A. Smith; Michael T. Rubes

1998-09-01T23:59:59.000Z

423

The structure of a combustion front propagating in a fixed bed of crushed oil shale : co-current configuration.  

E-Print Network (OSTI)

??La propagation d'un front de combustion au sein d'un milieu poreux réactif met en śuvre des mécanismes thermiques, chimiques et de transfert, avec de forts… (more)

Ferreira Martins, Marcio

2008-01-01T23:59:59.000Z

424

Cold Air Damming by the Front Range of the Colorado Rockies and its Relationship to Locally Heavy Snows  

Science Conference Proceedings (OSTI)

Heavy snowstorms occur regularly along Colorado's Front Range and cause significant economic and human consequences for the urban corridor from Denver to Fort Collins. This paper examines one type of winter storm that displays great variability ...

Lawrence Dunn

1987-09-01T23:59:59.000Z

425

Is a Cold Pool Necessary for the Maintenance of a Squall Line Produced by a Cold Front Aloft?  

Science Conference Proceedings (OSTI)

On 19–20 June 1979 a cyclone moved through the central United States. This cyclone contained a squall line associated with a cold front aloft (CFA), which caused significant damage. The fifth-generation Pennsylvania State University–NCAR ...

Mark T. Stoelinga; John D. Locatelli; Ralph D. Schwartz; Peter V. Hobbs

2003-01-01T23:59:59.000Z

426

Well-balanced bicharacteristic-based scheme for multilayer shallow water flows including wet/dry fronts  

Science Conference Proceedings (OSTI)

The aim of this paper is to present a new well-balanced finite volume scheme for two-dimensional multilayer shallow water flows including wet/dry fronts. The ideas, presented here for the two-layer model, can be generalized to a multilayer case in a ... Keywords: Bicharacteristics, Evolution galerkin, Finite volume method, Two-layer shallow water, Well-balance, Wet/dry front

M. Dudzinski; M. Luká?Ová-Medvid'Ová

2013-02-01T23:59:59.000Z

427

Brake System Modeling and Control  

E-Print Network (OSTI)

of 3447 kPa Upper Left: Volts vs. Angular Position, showingone cycle. Lower Right: Volts vs. Position at several brakewith a magnitude of several volts. The INA118, a precision

Hedrick, J. K.; Uchanski, M.

2001-01-01T23:59:59.000Z

428

Mechanical and Hydraulic Press Brakes  

Science Conference Proceedings (OSTI)

...drives, with mechanical linkages from motor to flywheel to clutch to gears to crankshaft to crank arm to ram (Fig. 4). They all have one thing in common: a crankshaft action that converts rotary motion into straight, reciprocating motion (Fig. 5). During a stroke cycle, the crank arm drives the ram down...

429

A thousand words: themes and trends in home front poster propaganda of the second world war  

E-Print Network (OSTI)

Poster propaganda is one of the most memorable and enduring legacies of the Second World War. These artistic creations were strongly influenced by social and cultural paradigms as well as corresponding military events. Previous scholarship on propaganda has largely overlooked the role of posters and propaganda efforts on the home front, a gap that this study seeks to fill. The purpose of this study is to compare home front posters produced by the major nations involved in the European theatre and discern any trends or patterns that have a larger significance. Each poster in the sample was arranged chronologically by country. The area of emphasis (recruiting, production, etc.) and appeal (duty, guilt, fear, hate, etc.) for each poster was then recorded and analyzed. The analyses revealed several significant trends and patterns. The most important of these is that posters, regardless of which country produced them, tended to appeal to negative emotions (hate, fear, etc.) when the war was going badly and positive emotions (patriotism, duty, etc.) when the war was being won. Even when the areas of emphasis remained the same, the images, rhetoric and overall emotional tone of posters changed depending on the corresponding war situation. In other words, what a government said was not always as important as how they said it. This trend is equally significant today. Although posters have disappeared as a major propaganda tool, nations still fight wars and still carry out propaganda campaigns, therefore, if relationship between propaganda and the conduct of war presented in this study is applied to modern campaigns it provides the public with information that propaganda intends to keep secret: the truth about the war. Previous scholarship has mentioned this connection between propaganda methods and military operations, but as previously mentioned, these studies neglect both the home front and the poster, choosing to focus on propaganda directed at the enemy. Other patterns, such as the use of humor and religion in posters, are briefly touched on and provide possible areas for future research.

Thomas, Christopher C.

2003-05-01T23:59:59.000Z

430

Components of MMCs Currently in Use  

Science Conference Proceedings (OSTI)

Table 2   Use of metal-matrix composites (MMCs) in automotive applications...Al/SiC p front brake rotors for an electric vehicle

431

The SNS front-end, an injector for a high-power hydrogen-ion accelerator  

DOE Green Energy (OSTI)

The Spallation Neutron Source (SNS) will be an accelerator-based facility in Oak Ridge, TN, delivering pulsed neutron beams to experimenters. Negative hydrogen ion-beams are generated and pre-accelerated in a 2.5-MeV linac injector, or front end (FE), accelerated to 1 GeV energy by a linear accelerator system, converted into protons and accumulated in a ring accelerator, and then directed towards a mercury target to generate the neutrons. The proton beam arrives at the target in bursts of less than 1 {micro}s duration and with more than 1 MW average power. The front end has been built and commissioned by LBNL in Berkeley; shipment to ORNL is essentially complete. This paper provides an overview of FE major design features and experimental results obtained during the commissioning process. The SNS-FE can be viewed as a prototype of a high-current, high duty-factor injector for other accelerator projects or, without the elaborate MEBT, as an independent 2.5-MeV accelerator for various applications.

Keller, R.

2002-02-01T23:59:59.000Z

432

Low temperature front surface passivation of interdigitated back contact silicon heterojunction solar cell  

DOE Green Energy (OSTI)

The interdigitated back contact silicon heterojunction (IBC-SHJ) solar cell requires a low temperature front surface passivation/anti-reflection structure. Conventional silicon surface passivation using SiO2 or a-SiNx is performed at temperature higher than 400°C, which is not suitable for the IBC-SHJ cell. In this paper, we propose a PECVD a-Si:H/a-SiNx:H/a-SiC:H stack structure to passivate the front surface of crystalline silicon at low temperature. The optical properties and passivation quality of this structure are characterized and solar cells using this structure are fabricated. With 2 nm a-Si:H layer, the stack structure exhibits stable passivation with effective minority carrier lifetime higher than 2 ms, and compatible with IBC-SHJ solar cell processing. A critical advantage of this structure is that the SiC allows it to be HF resistant, thus it can be deposited as the first step in the process. This protects the a-Si/c-Si interface and maintains a low surface recombination velocity.

Shu, Brent; Das, Ujjwal; Jani, Omkar; Hegedus, Steve; Birkmire, Robert

2009-06-08T23:59:59.000Z

433

Statistical nature of cold fronts within the Gulf of Mexico and their potential influence on OTEC operations  

DOE Green Energy (OSTI)

This study was undertaken to quantify selected aspects of cold fronts as they penetrate southward into the Gulf of Mexico region. A need arises to statistically define the nature of these cold fronts since the Department of Energy's Ocean Thermal Energy Conversion (OTEC) program is geared for determining the feasibility of utilizing the temperature difference between the tropical ocean surface and depths of approximately 1500 m for the production of power. However, severe winters are known to significantly decrease the normal sea surface temperature by approximately 7.2/sup 0/F as well as cause deepening of the mixed layer (Leetmaa, 1977). With an OTEC plant operating at efficiencies of only 2 to 3 percent, the plant could become marginally operational during the winter months. Upon the passage of a cold front, the sea surface will exchange heat to the atmosphere through the fluxes of latent and sensible heat. Garstang (1969) has shown that these fluxes can increase more than an order of magnitude upon the passage of a moderate cold front. Long term, greater than 25 years, meteorological data from the National Climatic Center was used as the basis for determining the impact of cold fronts in the gulf of Mexico region. In particular, surface air temperature and wind direction were analyzed daily during the months of December, January, and February. The drop in temperature as well as the directional wind shift were the criteria for the frontal passage. Surface observation data from Tampa and Key West, Florida were used.

Ulanski, S.L.

1978-12-01T23:59:59.000Z

434

Visualization of research fronts and knowledge bases by three-dimensional areal densities of bibliographically coupled publications and co-citations  

Science Conference Proceedings (OSTI)

In this work the well known scientometric concepts of bibliographically coupled publications and co-cited references were applied to produce interactive maps of research fronts and knowledge bases of research fields. This article proposes a method and ... Keywords: 3D-visualisation, Battery research, Bibliographic coupling, Co-citation analysis, Emerging research fronts, Jaccard index, Knowledge bases, Local paper density, Research fronts, Science mapping, Similarity, Spatial density

Edgar Schiebel

2012-05-01T23:59:59.000Z

435

Dynamic stabilization of Rayleigh-Taylor instability in an ablation front  

Science Conference Proceedings (OSTI)

Dynamic stabilization of Rayleigh-Taylor instability in an ablation front is studied by considering a modulation in the acceleration that consists of sequences of Dirac deltas. This allows obtaining explicit analytical expressions for the instability growth rate as well as for the boundaries of the stability region. As a general rule, it is found that it is possible to stabilize all wave numbers above a certain minimum value k{sub m}, but the requirements in the modulation amplitude and frequency become more exigent with smaller k{sub m}. The essential role of compressibility is phenomenologically addressed in order to find the constraint it imposes on the stability region. The results for some different wave forms of the acceleration modulation are also presented.

Piriz, A. R.; Di Lucchio, L.; Rodriguez Prieto, G. [ETSI Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real (Spain) and Instituto de Investigaciones Energeticas, 13071 Ciudad Real (Spain)

2011-01-15T23:59:59.000Z

436

ANL/APS/TB-5 Functional Description of APS Beamline Front Ends  

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

Functional Description of APS Beamline Front Ends by Tuncer Kuzay February 1993 Advanced Photon Source & Argonne National Laboratory, Argonne, Illinois 60439 o operated by The University of Chicago for the United States Department of Energy under Contract W-31-1 09-Eng-38 Argonne National Laboratory, with facilties in the states of Ilinois and Idaho, is owned by the United States government, and operated by The University of Chicago under the provisions of a contract with the Deparment of Energy. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any waranty, express or implied, or assumes any legal liability or responsibility for the accuracy,

437

On the ``massless gap`` adjustment of detected energy for passive material in front of a calorimeter  

SciTech Connect

I have designed a correction scheme for energy losses in passive material in front of a calorimeter based on the ``massless gap`` idea. I use a flexible geometry model of a calorimeter design for SDC outside of a solenoidal coil made of aluminium cylinders of adjustable thickness. The signal from the first radiation length of active calorimetry is scaled dependent on the incoming and observed energies of the shower. A reasonable recovery of the resolution of an unobstructed calorimeter is achieved using correction factors that depend only upon the total thickness of passive material. Thus a useful correction may be built into the hardware by increasing the amount of scintillator in the first radiation length of the active calorimeter. The distribution of correction factors determined event-by-event indicate that an additional dependence on the observed signal in the massless gap and total incident energy is clearly present.

Trost, H.J.

1992-01-31T23:59:59.000Z

438

On the massless gap'' adjustment of detected energy for passive material in front of a calorimeter  

SciTech Connect

I have designed a correction scheme for energy losses in passive material in front of a calorimeter based on the massless gap'' idea. I use a flexible geometry model of a calorimeter design for SDC outside of a solenoidal coil made of aluminium cylinders of adjustable thickness. The signal from the first radiation length of active calorimetry is scaled dependent on the incoming and observed energies of the shower. A reasonable recovery of the resolution of an unobstructed calorimeter is achieved using correction factors that depend only upon the total thickness of passive material. Thus a useful correction may be built into the hardware by increasing the amount of scintillator in the first radiation length of the active calorimeter. The distribution of correction factors determined event-by-event indicate that an additional dependence on the observed signal in the massless gap and total incident energy is clearly present.

Trost, H.J.

1992-01-31T23:59:59.000Z

439

Prototype ATLAS IBL Modules using the FE-I4A Front-End Readout Chip  

E-Print Network (OSTI)

The ATLAS Collaboration will upgrade its semiconductor pixel tracking detector with a new Insertable B-layer (IBL) between the existing pixel detector and the vacuum pipe of the Large Hadron Collider. The extreme operating conditions at this location have necessitated the development of new radiation hard pixel sensor technologies and a new front-end readout chip, called the FE-I4. Planar pixel sensors and 3D pixel sensors have been investigated to equip this new pixel layer, and prototype modules using the FE-I4A have been fabricated and characterized using 120 GeV pions at the CERN SPS and 4 GeV positrons at DESY, before and after module irradiation. Beam test results are presented, including charge collection efficiency, tracking efficiency and charge sharing.

Albert, J; Alimonti, Gianluca; Allport, Phil; Altenheiner, Silke; Ancu, Lucian; Andreazza, Attilio; Arguin, Jean-Francois; Arutinov, David; Backhaus, Malte; Bagolini, Alvise; Ballansat, Jacques; Barbero, Marlon; Barbier, Gérard; Bates, Richard; Battistin, Michele; Baudin, Patrick; Beau, Tristan; Beccherle, Roberto; Beck, Hans Peter; Benoit, Mathieu; Bensinger, Jim; Bomben, Marco; Borri, Marcello; Boscardin, Maurizio; Botelho Direito, Jose Antonio; Bousson, Nicolas; Boyd, George Russell Jr; Breugnon, Patrick; Bruni, Graziano; Bruschi, Marco; Buchholz, Peter; Buttar, Craig; Cadoux, Franck; Calderini, Giovanni; Caminada, Leah; Capeans, Mar; Casse, Gianluigi; Catinaccio, Andrea; Cavalli-Sforza, Matteo; Chauveau, Jacques; Chu, Ming-Lee; Ciapetti, Marco; Cindro, Vladimir; Citterio, Mauro; Clark, Allan; Cobal, Marina; Coelli, Simone; Colijn, Auke-Pieter; Colin, Daly; Collot, Johann; Crespo-Lopez, Olivier; Dalla Betta, Gian-Franco; Darbo, Giovanni; DaVia, Cinzia; David, Pierre-Yves; Debieux, Stéphane; Delebecque, Pierre; Devetak, Erik; DeWilde, Burton; Di Girolamo, Beniamino; Dinu, Nicoleta; Dittus, Fridolin; Diyakov, Denis; Djama, Fares; Dobos, Daniel Adam; Doonan, Kate; Dopke, Jens; Dorholt, Ole; Dube, Sourabh; Dushkin, Andrey; Dzahini, Daniel; Egorov, Kirill; Ehrmann, Oswin; Elldge, David; Elles, Sabine; Elsing, Markus; Eraud, Ludovic; Ereditato, Antonio; Eyring, Andreas; Falchieri, Davide; Falou, Aboud; Fang, Xiaochao; Fausten, Camille; Favre, Yannick; Ferrere, Didier; Fleta, Celeste; Fleury, Julien; Flick, Tobias; Forshaw, Dean; Fougeron, Denis; Fritzsch, Thomas; Gabrielli, Alessandro; Gaglione, Renaud; Gallrapp, Christian; Gan, K; Garcia-Sciveres, Maurice; Gariano, Giuseppe; Gastaldi, Thibaut; Gemme, Claudia; Gensolen, Fabrice; George, Matthias; Ghislain, Patrick; Giacomini, Gabriele; Gibson, Stephen; Giordani, Mario Paolo; Giugni, Danilo; Gjersdal, Hĺvard; Glitza, Karl Walter; Gnani, Dario; Godlewski, Jan; Gonella, Laura; Gorelov, Igor; Gorišek, Andrej; Gössling, Claus; Grancagnolo, Sergio; Gray, Heather; Gregor, Ingrid-Maria; Grenier, Philippe; Grinstein, Sebastian; Gromov, Vladimir; Grondin, Denis; Grosse-Knetter, Jörn; Hansen, Thor-Erik; Hansson, Per; Harb, Ali; Hartman, Neal; Hasi, Jasmine; Hegner, Franziska; Heim, Timon; Heinemann, Beate; Hemperek, Tomasz; Hessey, Nigel; Hetmánek, Martin; Hoeferkamp, Martin; Hostachy, Jean-Yves; Hügging, Fabian; Husi, Coralie; Iacobucci, Giuseppe; Idarraga, John; Ikegami, Yoichi; Janoška, Zdenko; Jansen, Jens; Jansen, Luc; Jensen, Frank; Jentzsch, Jennifer; Joseph, John; Kagan, Harris; Karagounis, Michael; Kass, Richard; Kenney, Christopher J; Kersten, Susanne; Kind, Peter; Klingenberg, Reiner; Kluit, Ruud; Kocian, Martin; Koffeman, Els; Kok, Angela; Korchak, Oleksandr; Korolkov, Ilya; Kostyukhin, Vadim; Krieger, Nina; Krüger, Hans; Kruth, Andre; Kugel, Andreas; Kuykendall, William; La Rosa, Alessandro; Lai, Chung-Hang; Lantzsch, Kerstin; Laporte, Didier; Lapsien, Tobias; Lounis, abdenour; Lozano, Manuel; Lu, Yunpeng; Lubatti, Henry; Macchiolo, Anna; Mallik, Usha; Mandi?, Igor; Marchand, Denis; Marchiori, Giovanni; Massol, Nicolas; Matthias, Wittgen; Mättig, Peter; Mekkaoui, Abderrazak; Menouni, Mohsine; Menu, Johann; Meroni, Chiara; Mesa, Javier; Micelli, Andrea; Michal, Sébastien; Miglioranzi, Silvia; Mikuž, Marko; Mitsui, Shingo; Monti, Mauro; Moore, J; Morettini, Paolo; Muenstermann, Daniel; Murray, Peyton; Nellist, Clara; Nelson, David J; Nessi, Marzio; Neumann, Manuel; Nisius, Richard; Nordberg, Markus; Nuiry, Francois-Xavier; Oppermann, Hermann; Oriunno, Marco; Padilla, Cristobal; Parker, Sherwood; Pellegrini, Giulio; Pelleriti, Gabriel; Pernegger, Heinz; Piacquadio, Nicola Giacinto; Picazio, Attilio; Pohl, David; Polini, Alessandro; Popule, Ji?í; Portell Bueso, Xavier; Povoli, Marco; Puldon, David; Pylypchenko, Yuriy; Quadt, Arnulf; Quirion, David; Ragusa, Francesco; Rambure, Thibaut; Richards, Erik; Ristic, Branislav; Rřhne, Ole; Rothermund, Mario; Rovani, Alessandro; Rozanov, Alexandre; Rubinskiy, Igor; Rudolph, Matthew Scott; Rummler, André; Ruscino, Ettore; Salek, David; Salzburger, Andreas; Sandaker, Heidi; Schipper, Jan-David; Schneider, Basil; Schorlemmer, Andre; Schroer, Nicolai; Schwemling, Philippe; Seidel, Sally; Seiden, Abraham; Šícho, Petr; Skubic, Patrick; Sloboda, Michal; Smith, D; Sood, Alex; Spencer, Edwin; Strang, Michael; Stugu, Bjarne; Stupak, John; Su, Dong; Takubo, Yosuke; Tassan, Jean; Teng, Ping-Kun; Terada, Susumu; Todorov, Theodore; Tomášek, Michal; Toms, Konstantin; Travaglini, Riccardo; Trischuk, William; Troncon, Clara; Troska, Georg

2012-01-01T23:59:59.000Z

440

The first photon shutter development for APS insertion device beamline front ends  

Science Conference Proceedings (OSTI)

One of the most critical components on the Advanced Photon Source (APS) insertion device (ID) beamline front ends is the first photon shutter. It operates in two modes to fully intercept the high total power and high-heat flux ID photon beam in seconds (normal mode) or in less than 100 ms (emergency fast mode). It is designed to operate in ultra high vacuum (UHV). The design incorporates a multi-channel rectangular bar, bent in a ``hockey stick`` configuration, with two-point suspension. The flanged end is an articulated bellows with rolling hinges. The actuation end is a spring-assisted, pneumatic fail-safe flexural pivot type. The coolant (water) channels incorporate brazed copper foam to enhance the heat transfer, a tube technology particular to the APS. The design development, and material aspects, as well as the extensive thermal and vibrational analyses in support of the design, are presented in this paper.

Shu, Deming; Nian, H.L.T.; Wang, Zhibi; Collins, J.T.; Ryding, D.G.; Kuzay, T.M.

1992-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

The first photon shutter development for APS insertion device beamline front ends  

Science Conference Proceedings (OSTI)

One of the most critical components on the Advanced Photon Source (APS) insertion device (ID) beamline front ends is the first photon shutter. It operates in two modes to fully intercept the high total power and high-heat flux ID photon beam in seconds (normal mode) or in less than 100 ms (emergency fast mode). It is designed to operate in ultra high vacuum (UHV). The design incorporates a multi-channel rectangular bar, bent in a hockey stick'' configuration, with two-point suspension. The flanged end is an articulated bellows with rolling hinges. The actuation end is a spring-assisted, pneumatic fail-safe flexural pivot type. The coolant (water) channels incorporate brazed copper foam to enhance the heat transfer, a tube technology particular to the APS. The design development, and material aspects, as well as the extensive thermal and vibrational analyses in support of the design, are presented in this paper.

Shu, Deming; Nian, H.L.T.; Wang, Zhibi; Collins, J.T.; Ryding, D.G.; Kuzay, T.M.

1992-01-01T23:59:59.000Z

442

Control of Beam Losses in the Front End for the Neutrino Factory  

Science Conference Proceedings (OSTI)

In the Neutrino Factory and Muon Collider, muons are produced by firing high energy protons onto a target to produce pions. The pions decay to muons which are then accelerated. This method of pion production results in significant background from protons and electrons, which may result in heat deposition on superconducting materials and activation of the machine preventing manual handling. In this paper we discuss the design of a secondary particle handling system. The system comprises a solenoidal chicane that filters high momentum particles, followed by a proton absorber that reduces the energy of all particles, resulting in the rejection of low energy protons that pass through the solenoid chicane. We detail the design and optimization of the system and its integration with the rest of the muon front end.

Neuffer, D.V.; /Fermilab; Snopok, P.; /IIT, Chicago; Rogers, C.T.; /Rutherford

2012-05-01T23:59:59.000Z

443

$|V_{ub}|$ and $B\\to\\eta^{(')}$ Form Factors in Covariant Light Front Approach  

E-Print Network (OSTI)

We study $B\\to (\\pi, \\eta, \\eta')$ transition form factors in the framework of covariant light front approach. With the theoretical uncertainties, we find that $B\\to (\\pi, \\eta, \\eta')$ form factors at $q^2=0$ are $f^{(\\pi, \\eta, \\eta')}_{+}(0)=(0.245^{+0.000}_{-0.001}\\pm 0.011, 0.220 \\pm 0.009\\pm0.009, 0.180\\pm 0.008^{+0.008}_{-0.007})$ for vector current and $f^{(\\pi, \\eta, \\eta')}_{T}(0)=(0.239^{+0.002+0.020}_{-0.003-0.018}, 0.211\\pm 0.009^{+0.017}_{-0.015}, 0.173\\pm 0.007^{+0.014}_{-0.013})$ for tensor current, respectively. With the obtained $q^2$-dependent $f^{\\pi}_{+}(q^2)$ and observed branching ratio (BR) for $\\bar B_d\\to \\pi^+ \\ell \\bar \

Chen, Chuan-Hung; Wang, Wei

2009-01-01T23:59:59.000Z

444

Chandra Observation of MS 1455.0+2232: cold fronts in a massive cooling flow cluster?  

E-Print Network (OSTI)

We present the Chandra observation of the cluster of galaxies MS 1455.0+2232. From previous ASCA and ROSAT observations, this cluster was identified as a ``relaxed'' cluster that hosts one of the most massive cooling flows detected. With higher angular resolution, the Chandra X-ray image shows the presence of two surface brightness edges on opposite sides of the X-ray peak: the first at 190 kpc to the north and the second at 450 kpc to the south. Even though the low exposure of this observation limits our ability to constrain the temperature jump across both edges, we show that the northern edge is likely to be a ``cold front'' similar to others observed recently by Chandra in the clusters A2142, A3667, RX J1720.1+2638, and A2256. The observed cold front is most likely produced by the motion, from south to north, of a group-size dark matter halo. The most natural explanation for the presence of this observed moving subclump is that MS 1455.0+2232 is a merger cluster in the very last stage before it becomes fully relaxed. This scenario, however, appears to be unlikely as the cluster shows no further sign of ongoing merger. Moreover, it is not clear if a massive cooling flow could have survived this kind of merger. We propose an alternative scenario in which, as for RX J1720.1+2638, MS 1455.0+2232 is the result of the hierarchical collapse of two co-located density perturbations, the first a group-scale perturbation collapse followed by a second cluster-scale perturbation collapse that surrounded, but did not destroy, the first. We suggest that a cooling flow may have begun inside the already collapsed group-scale perturbation and may have been later amplified by the gas compression induced by the infall of the overlying main cluster mass.

P. Mazzotta; M. Markevitch; W. R. Forman; C. Jones; A. Vikhlinin; L. VanSpeybroeck

2001-08-29T23:59:59.000Z

445

Development/Demonstration of an Advanced Oxy-Fuel Front-End System  

SciTech Connect

Owens Corning and other glass manufacturers have used oxy-fuel combustion technology successfully in furnaces to reduce emissions, increase throughput, reduce fuel consumption and, depending on the costs of oxygen and fuel, reduce energy costs. The front end of a fiberglass furnace is the refractory channel system that delivers glass from the melter to the forming process. After the melter, it is the second largest user of energy in a fiberglass plant. A consortium of glass companies and suppliers, led by Owens Corning, was formed to develop and demonstrate oxy/fuel combustion technology for the front end of a fiberglass melter, to demonstrate the viability of this energy saving technology to the U.S. glass industry, as a D.O.E. sponsored project. The project goals were to reduce natural gas consumption and CO2 green house gas emissions by 65 to 70% and create net cost savings after the purchase of oxygen to achieve a project payback of less than 2 years. Project results in Jackson, TN included achieving a 56% reduction in gas consumption and CO2 emissions. A subsequent installation in Guelph ON, not impacted by unrelated operational changes in Jackson, achieved a 64% reduction. Using the more accurate 64% reduction in the payback calculation yielded a 2.2 year payback in Jackson. The installation of the demonstration combustion system saves 77,000 DT/yr of natural gas or 77 trillion Btu/yr and eliminates 4500 tons/yr of CO2 emissions. This combustion system is one of several energy and green house gas reduction technologies being adopted by Owens Corning to achieve aggressive goals relating to the company’s global facility environmental footprint.

Mighton, Steven, J.

2007-08-06T23:59:59.000Z

446

Scintillation counter and wire chamber front end modules for high energy physics experiments  

SciTech Connect

This document describes two front-end modules developed for the proposed MIPP upgrade (P-960) experiment at Fermilab. The scintillation counter module was developed for the Plastic Ball detector time and charge measurements. The module has eight LEMO 00 input connectors terminated with 50 ohms and accepts negative photomultiplier signals in the range 0.25...1000 pC with the maximum input voltage of 4.0 V. Each input has a passive splitter with integration and differentiation times of {approx}20 ns. The integrated portion of the signal is digitized at 26.55 MHz by Analog Devices AD9229 12-bit pipelined 4-channel ADC. The differentiated signal is discriminated for time measurement and sent to one of the four TMC304 inputs. The 4-channel TMC304 chip allows high precision time measurement of rising and falling edges with {approx}100 ps resolution and has internal digital pipeline. The ADC data is also pipelined which allows deadtime-less operation with trigger decision times of {approx}4 {micro}s. The wire chamber module was developed for MIPP EMCal detector charge measurements. The 32-channel digitizer accepts differential analog signals from four 8-channel integrating wire amplifiers. The connection between wire amplifier and digitizer is provided via 26-wire twist-n-flat cable. The wire amplifier integrates input wire current and has sensitivity of 275 mV/pC and the noise level of {approx}0.013 pC. The digitizer uses the same 12-bit AD9229 ADC chip as the scintillator counter module. The wire amplifier has a built-in test pulser with a mask register to provide testing of the individual channels. Both modules are implemented as a 6Ux220 mm VME size board with 48-pin power connector. A custom europack (VME) 21-slot crate is developed for housing these front-end modules.

Baldin, Boris; DalMonte, Lou; /Fermilab

2011-01-01T23:59:59.000Z

447

A Cold Frontal Rainband Observed during the LANDES-FRONTS 84 Experiment: Mesoscale and Small-Scale Structure Inferred from Dual-Doppler Radar Analysis.  

Science Conference Proceedings (OSTI)

This paper presents the kinematic structure of a cold frontal rainband associated with a secondary cold front which moved over southwest of France on 4 June 1984.

Y. Lemaitre; G. Scialom; P. Amayenc

1989-07-01T23:59:59.000Z

448

CAST STONE OXIDATION FRONT EVALUATION: PRELIMINARY RESULTS FOR SAMPLES EXPOSED TO MOIST AIR  

Science Conference Proceedings (OSTI)

The rate of oxidation is important to the long-term performance of reducing salt waste forms because the solubility of some contaminants, e.g., technetium, is a function of oxidation state. TcO{sub 4}{sup ?} in the salt solution is reduced to Tc(IV) and has been shown to react with ingredients in the waste form to precipitate low solubility sulfide and/or oxide phases. Upon exposure to oxygen, the compounds containing Tc(IV) oxidize to the pertechnetate ion, Tc(VII)O{sub 4}{sup ?}, which is very soluble. Consequently the rate of technetium oxidation front advancement into a monolith and the technetium leaching profile as a function of depth from an exposed surface are important to waste form performance and ground water concentration predictions. An approach for measuring contaminant oxidation rate (effective contaminant specific oxidation rate) based on leaching of select contaminants of concern is described in this report. In addition, the relationship between reduction capacity and contaminant oxidation is addressed. Chromate (Cr(VI) was used as a non-radioactive surrogate for pertechnetate, Tc(VII), in Cast Stone samples prepared with 5 M Simulant. Cast Stone spiked with pertechnetate was also prepared and tested. Depth discrete subsamples spiked with Cr were cut from Cast Stone exposed to Savannah River Site (SRS) outdoor ambient temperature fluctuations and moist air. Depth discrete subsamples spiked with Tc-99 were cut from Cast Stone exposed to laboratory ambient temperature fluctuations and moist air. Similar conditions are expected to be encountered in the Cast Stone curing container. The leachability of Cr and Tc-99 and the reduction capacities, measured by the Angus-Glasser method, were determined for each subsample as a function of depth from the exposed surface. The results obtained to date were focused on continued method development and are preliminary and apply to the sample composition and curing / exposure conditions described in this report. • The Cr oxidation front (depth to which soluble Cr was detected) for the Cast Stone sample exposed for 68 days to ambient outdoor temperatures and humid air (total age of sample was 131 days) was determined to be about 35 mm below the top sample surface exposed. The Tc oxidation front, depth at which Tc was insoluble, was not determined. Interpretation of the results indicates that the oxidation front is at least 38 mm below the exposed surface. The sample used for this measurement was exposed to ambient laboratory conditions and humid air for 50 days. The total age of the sample was 98 days. • Technetium appears to be more easily oxidized than Cr in the Cast Stone matrix. The oxidized forms of Tc and Cr are soluble and therefore leachable. Longer exposure times are required for both the Cr and Tc spiked samples to better interpret the rate of oxidation. Tc spiked subsamples need to be taken further from the exposed surface to better define and interpret the leachable Tc profile. • Finally Tc(VII) reduction to Tc(IV) appears to occur relatively fast. Results demonstrated that about 95 percent of the Tc(VII) was reduced to Tc(IV) during the setting and very early stage setting for a Cast Stone sample cured 10 days. Additional testing at longer curing times is required to determine whether additional time is required to reduce 100 % of the Tc(VII) in Cast Stone or whether the Tc loading exceeded the ability of the waste form to reduce 100 % of the Tc(VII). Additional testing is required for samples cured for longer times. Depth discrete subsampling in a nitrogen glove box is also required to determine whether the 5 percent Tc extracted from the subsamples was the result of the sampling process which took place in air. Reduction capacity measurements (per the Angus-Glasser method) performed on depth discrete samples could not be correlated with the amount of chromium or technetium leached from the depth discrete subsamples or with the oxidation front inferred from soluble chromium and technetium (i.e., effective Cr and Tc oxidation fronts). Residual reduct

Langton, C.

2013-11-26T23:59:59.000Z

449

PHYSICAL REVIEW E 84, 036104 (2011) Average crack-front velocity during subcritical fracture propagation in a heterogeneous medium  

E-Print Network (OSTI)

stress corrosion, diffusion, dissolution, and plasticity [1,5]. Several experimental empirical relations results in an increase in the speed of crack growth. A weak stress-sensitive regime follows wherePHYSICAL REVIEW E 84, 036104 (2011) Average crack-front velocity during subcritical fracture

Schmittbuhl, Jean

450

Temperature activated absorption during laser-induced damage: The evolution of laser-supported solid-state absorption fronts  

SciTech Connect

Previously we have shown that the size of laser induced damage sites in both KDP and SiO{sub 2} is largely governed by the duration of the laser pulse which creates them. Here we present a model based on experiment and simulation that accounts for this behavior. Specifically, we show that solid-state laser-supported absorption fronts are generated during a damage event and that these fronts propagate at constant velocities for laser intensities up to 4 GW/cm{sup 2}. It is the constant absorption front velocity that leads to the dependence of laser damage site size on pulse duration. We show that these absorption fronts are driven principally by the temperature-activated deep sub band-gap optical absorptivity, free electron transport, and thermal diffusion in defect-free silica for temperatures up to 15,000K and pressures < 15GPa. In addition to the practical application of selecting an optimal laser for pre-initiation of large aperture optics, this work serves as a platform for understanding general laser-matter interactions in dielectrics under a variety of conditions.

Carr, C W; Bude, J D; Shen, N; Demange, P

2010-10-26T23:59:59.000Z

451

Air–Sea Heat Exchange along the Northern Sea Surface Temperature Front in the Eastern Tropical Pacific  

Science Conference Proceedings (OSTI)

The atmospheric response to the oceanic forcing in the eastern Pacific along the northern equatorial sea surface temperature (SST) front is investigated in terms of sensible and latent heat flux during the 6-month period from 28 July 1999 to 27 ...

Nicolai Thum; Steven K. Esbensen; Dudley B. Chelton; Michael J. McPhaden

2002-12-01T23:59:59.000Z

452

ICPIG, July 15-20, 2007, Prague, Czech Republi Negative streamer fronts: comparison of particle and fluid models and  

E-Print Network (OSTI)

. This front region is also important for the generation of high energy electrons in streamer and leader. Fluid model The fluid model approximates the average dynamics of the local electrons as local densitiesV is the ionization energy. Panel (d) zooms into panel (c), both in space and in densities. Both fluid and particle

Ebert, Ute

453

Wind and Thermodynamic Retrieval from Single-Doppler Measurements of a Gust Front Observed during Phoenix II  

Science Conference Proceedings (OSTI)

The adjoint method to retrieve the three-dimensional wind and thermodynamic fields is applied to single-Doppler observations of a gust front measured during the Phoenix II experiment. This method uses a fluid dynamics model and its adjoint, and ...

Juanzhen Sun; Andrew Crook

1994-06-01T23:59:59.000Z

454

An Observation of Frontal Wave Development on a Shelf-Slope/Warm Core Ring Front Near the Shelf Break South of New England  

Science Conference Proceedings (OSTI)

Small-scale waves have been observed near 40°N, 68°30?W in specially enhanced satellite imagery of a strong temperature front formed in May 1979, between the shelf/slope-water front and warm core ring 79-B. Thew frontal waves had a wavelength of ...

S. R. Ramp; R. C. Beardsley; R. Legeckis

1983-05-01T23:59:59.000Z

455

Journal of Statistical Physics, Vol. 90, Nos. 5/6, 1998 We study the nucleation and growth of flame fronts in slow combustion. This  

E-Print Network (OSTI)

fronts in slow combustion. This is modeled by a set of reaction-diffusion equations for the temperature: Nucleation; reaction-diffusion systems; flame fronts. Nucleation, Growth, and Scaling in Slow Combustion applied to understand some aspects of slow combustion. We use a phase-field model of two coupled reaction

Grant, Martin

456

Structure and Evolution of Winter Cyclones in the Central United States and Their Effects on the Distribution of Precipitation. Part II: Arctic Fronts  

Science Conference Proceedings (OSTI)

The structure and evolution of a shallow but intense cold front (commonly referred to as an arctic front) and its associated precipitation features that passed through the central United States from 0000 UTC 9 March to 0000 UTC 10 March 1992 are ...

Peng-Yun Wang; Jonathan E. Martin; John D. Locatelli; Peter V. Hobbs

1995-05-01T23:59:59.000Z

457

A Case Study of Coupling between Low- and Upper-Level Jet–Front Systems: Investigation of Dynamical and Diabatic Processes  

Science Conference Proceedings (OSTI)

An example of coupling between an upper-level and a low-level jet–front system is analyzed using the mesoscale hydrostatic model SALSA. The case study chosen is the cold front sampled during the intensive observation period 2 of the Mesoscale ...

Jean-Luc Sortais; Jean-Pierre Cammas; Xiao Ding Yu; Evelyne Richard; Robert Rosset

1993-08-01T23:59:59.000Z

458

Crystallization mechanisms and recording characteristics of Si/CuSi bilayer for write-once blu-ray disc  

SciTech Connect

The crystallization mechanisms of Si/CuSi bilayer and its recording characteristics for write-once blu-ray disc (BD-R) were investigated. It was found that Cu{sub 3}Si phase appeared during the room temperature sputtered deposition. Then, the Si atoms in CuSi layer segregated and crystallized to cubic Si in Cu{sub 3}Si nucleation sites as the film was annealed at 270 deg. C. After heating to 500 deg. C, the grains size of cubic Si phase grew and the hexagonal Si phase was observed. The dynamic tests show that the Si/CuSi bilayer has great feasibility for 1-4x BD-R with the bottom jitter values below 6.5%.

Ou, Sin-Liang; Kuo, Po-Cheng; Tsai, Tsung-Lin [Departmant of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan (China); Chen, Sheng-Chi [Department of Materials Engineering and Center for Thin Film Technologies and Applications, Ming Chi University of Technology, Taipei 243, Taiwan (China); Yeh, Chin-Yen; Chang, Han-Feng [CMC Magnetics Corporation, Taoyuan 333, Taiwan (China); Lee, Chao-Te; Chiang, Donyau [Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu 300, Taiwan (China)

2011-09-19T23:59:59.000Z

459

Plans for an Integrated Front-End Test Stand at the Spallation Neutron Source  

SciTech Connect

A spare Radio-Frequency Quadrupole (RFQ) is presently being fabricated by industry with delivery to Oak Ridge National Laboratory planned in late 2012. The establishment of a test stand at the Spallation Neutron Source site is underway so that complete acceptance testing can be performed during the winter of 2012-2013. This activity is the first step in the establishment of an integrated front-end test stand that will include an ion source, low-energy beam transport (LEBT), RFQ, medium-energy beam transport, diagnostics, and a beam dump. The test stand will be capable of delivering an H- ion beam of up to 50 mA with a pulse length of 1 ms and a repetition rate of 60 Hz or a proton beam of up to 50 mA, 100us, 1Hz. The test stand will enable the following activities: complete ion source characterization; development of a magnetic LEBT chopper; development of a two-source layout; development of beam diagnostics; and study of beam dynamics of high intensity beam.

Champion, Mark S [ORNL; Aleksandrov, Alexander V [ORNL; Crofford, Mark T [ORNL; Heidenreich, Dale A [ORNL; Kang, Yoon W [ORNL; Moss, John [ORNL; Roseberry, Jr., R Tom [ORNL; Schubert, James Phillip [ORNL

2012-01-01T23:59:59.000Z

460

Impacts of a Supersonic Shock Front on Star Formation in the Bullet Cluster  

E-Print Network (OSTI)

We use the Bullet Cluster (1E0657-56) to investigate the extent to which star formation in cluster galaxies is influenced by ram pressure from supersonic gas (Mach 3) during a cluster merger. While the effects of ram pressure have been studied for individual galaxies infalling into galaxy clusters, this system provides a unique opportunity to investigate the impact of dramatic merger events on the cluster galaxy population. In this analysis we use {\\it Spitzer} IRAC data to study star formation. At the redshift of the cluster the 6.2 $\\mu$m PAH feature is redshifted into the 8 $\\mu$m band, enabling use of the m$_{4.5}$-m$_{8}$ color as a proxy for specific star formation rate. We find that the color distribution on the two sides of the shock differ by less than 2$\\sigma$, and conclude that ram pressure from the shock front has no dramatic, immediate impact on the star formation of cluster galaxies in the Bullet Cluster.

Sun Mi Chung; Anthony H. Gonzalez; Douglas Clowe; Dennis Zaritsky; Maxim Markevitch; Christine Jones

2008-10-07T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" 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

Impacts of a Supersonic Shock Front on Star Formation in the Bullet Cluster  

E-Print Network (OSTI)

We use the Bullet Cluster (1E0657-56) to investigate the extent to which star formation in cluster galaxies is influenced by ram pressure from supersonic gas (Mach 3) during a cluster merger. While the effects of ram pressure have been studied for individual galaxies infalling into galaxy clusters, this system provides a unique opportunity to investigate the impact of dramatic merger events on the cluster galaxy population. In this analysis we use {\\it Spitzer} IRAC data to study star formation. At the redshift of the cluster the 6.2 $\\mu$m PAH feature is redshifted into the 8 $\\mu$m band, enabling use of the m$_{4.5}$-m$_{8}$ color as a proxy for specific star formation rate. We find that the color distribution on the two sides of the shock differ by less than 2$\\sigma$, and conclude that ram pressure from the shock front has no dramatic, immediate impact on the star formation of cluster galaxies in the Bullet Cluster.

Chung, Sun Mi; Clowe, Douglas; Zaritsky, Dennis; Markevitch, Maxim; Jones, Christine

2008-01-01T23:59:59.000Z

462

Application of an atmospheric dispersion model to simulated pollutant releases in the Colorado Front range  

SciTech Connect

The 1991 ASCOT (Atmospheric Studies in Complex Terrain) field study in the vicinity of the Department of Energy`s Rocky Flats Plant, Colorado, was conducted to study the local and regional circulations and their interactions with synoptic flows over the complex terrain of the Rocky Mountains Colorado Front range. The study was combined with the Rocky Flats Winter validation Study (WVS) which had similar objectives. Tracer plumes were released as part of this field campaign over the period of February 3--19, 1991 from the Rocky Flats Plant. Twelve intensive experiments, centered around eleven-hour long surface releases of sulfur hexafloride (SF{sub 6})tracer material, were conducted by teams from a number of national laboratories, government agencies and private contractors. One-hourly averaged tracer concentrations were collected from approximately 170 surface samplers deployed along two concentric circles at a radius of 8 km and 16 km from the release location. The concentration patterns resulting from the transport and turbulent diffusion of the SF{sub 6} traces plumes within the atmospheric boundary layer during two night-time, one morning transition, and one day-time period were simulated for this paper. The scenarios selected represent the first-choice of all twelve experiments to be addressed, based on the quality and completeness of the collected data base and the presence of the desired meteorological conditions.

Lange, R.

1993-05-01T23:59:59.000Z

463

Magnetic field effects on the thermonuclear combustion front of Chandrasekhar mass white dwarfs  

E-Print Network (OSTI)

The explosion of a type Ia supernova starts in a white dwarf as a laminar deflagration at the center of the star and soon several hydrodynamic instabilities, in particular, the Rayleigh-Taylor instability, begin to act. A cellular stationary combustion and a turbulent combustion regime are rapidly achieved by the flame and maintained up to the end of the so-called flamelet regime when the transition to detonation is believed to occur. The burning velocity at these regimes is well described by the fractal model of combustion. Using a semi-analytic approach, we describe the effect of magnetic fields on the fractalization of the front considering a white dwarf with a nearly dipolar magnetic field. We find an intrinsic asymmetry on the velocity field that may be maintained up to the free expansion phase of the remnant. Considering the strongest values inferred for a white dwarf's magnetic fields with strengths up to $10^{8}-10^{9}$ G at the surface and assuming that the field near the centre is roughly 10 times greater, asymmetries in the velocity field higher than $10-20 %$ are produced between the magnetic polar and the equatorial axis of the remnant which may be related to the asymmetries found from recent spectropolarimetric observations of very young SN Ia remnants. Dependence of the asymmetry with white dwarf composition is also analyzed.

Cristian R. Ghezzi; Elisabete M. de Gouveia Dal Pino; Jorge E. Horvath

2000-12-06T23:59:59.000Z

464

2009 VW Jetta TDI Test Cell Location Front Vehicle Setup Information  

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

VW Jetta TDI VW Jetta TDI Test Cell Location Front Vehicle Setup Information Downloadable Dynamometer Database (D 3 )- Test Summary Sheet Vehicle Architecture Conventional- Diesel Vehicle Dynamometer Input Document Date 8/7/2013 Advanced Powertrain Research Facility Test weight [lb] Target A [lb] 3625 35 Target B [lb/mph] Target C [lb/mph^2] 0.18 0.0193 Revision Number 3 Notes: Test Fuel Information Fuel type 2007 Certification Diesel Fuel density [g/ml] Fuel Net HV [BTU/lbm] 0.855 18355 T e s t I D [ # ] C y c l e C o l d s t a r t ( C S t ) H o t s t a r t [ H S t ] D a t e T e s t C e l l T e m p [ C ] T e s t C e l l R H [ % ] T e s t C e l l B a r o [ i n / H g ] V e h i c l e c o o l i n g f a n s p e e d : S p e e d M a t c h [ S M ] o r c o n s t a n t s p e e d [ C S ] S o l a r L a m p s [ W / m 2 ] V e i c l e C l i m a t e C o n t r o l s e t t i n g s H o o d P o s i t i o n [ U p ] o r [ C l o s e d ] W i n d o w P o s i t i o n [ C l o s e d ] o r [ D o w n ] C y c l e D i s t a n c e

465

The Effect of Heterogeneity on In-Situ Combustion: The Propagation of Combustion Fronts in Layered Porous Media  

SciTech Connect

This report extend the approach to heterogeneous systems, by considering the simpler case of in-situ combustion in layered porous media (and particularly to a two-layer model). Analytical models were developed to delineate the combined elects of fluid flow, reaction and heat transfer on the dynamics of combustion fronts in layered porous media, using as parameters the thermal coupling between the layers, the heat transfer to the surroundings and the permeability contrast.

Akkutlu, I. Yucel; Yortsos, Yanis C.

2002-06-11T23:59:59.000Z

466

Developing front-end Web 2.0 technologies to access services, content and things in the future Internet  

Science Conference Proceedings (OSTI)

The future Internet is expected to be composed of a mesh of interoperable web services accessible from all over the web. This approach has not yet caught on since global user-service interaction is still an open issue. This paper states one vision with ... Keywords: Context, Future Internet, Internet of services, SOA, Service front-ends, User-service interaction, Web 2.0

Juan Alfonso Lara; David Lizcano; MaríA Aurora MartíNez; Juan Pazos

2013-07-01T23:59:59.000Z

467

VHF-ST Radar Observations of an Upper-Level Front Using Vertical and Oblique-Beam C2N Measurements  

Science Conference Proceedings (OSTI)

Mesoscale aspects of an upper-level front that moved over Brittany (France) during the Mesoscale Frontal Dynamical Project 1987 experiment are investigated using very high frequency stratospheric–tropospheric (VHF-ST) radar data and European ...

J-L. Caccia; J-P. Cammas

1998-02-01T23:59:59.000Z

468

Structure of the Cold Front Observed in SESAME-AVE III and its Comparison with the Hoskins-Bretherton Frontogenesis Model  

Science Conference Proceedings (OSTI)

A cold front which passed through the dense network of the SESAME-AVE (Severe Environmental Storms and Mesoscale Experiment–Atmospheric Variability Experiment) on 25–26 April 1979 was investigated. Rawinsonde data collected from 23 special ...

Yoshi Ogura; Diane Portis

1982-12-01T23:59:59.000Z

469

The 12/13 January 1988 Narrow Cold-Frontal Rainband Observed during MFDP/FRONTS 87. Part I: Kinematics and Thermodynamics  

Science Conference Proceedings (OSTI)

The kinematic and thermodynamic structure of a narrow cold-frontal rainband (NCFR) observed during the English–French–German MFDP/FRONTS 87 experiment is presented. Radiosonde data indicated a very weak convective instability below 1500-m ...

Frank Roux; Virginie Marécal; Daničle Hauser

1993-04-01T23:59:59.000Z

470

Control of the smoldering front temperature in a carbon- and carbonate-containing porous medium in order to limit CO2 emissions.  

E-Print Network (OSTI)

??La thčse s’intéresse au contrôle de la température d’un front de combustion propagé dans un milieu poreux contenant du carbone fixe et des carbonates (CaCO3).… (more)

Sennoune, Mohamed

2011-01-01T23:59:59.000Z

471

The origin of blue-shifted absorption features in the X-ray spectrum of PG 1211+143: Outflow or disc?  

E-Print Network (OSTI)

In some radio-quiet active galaxies (AGN), high-energy absorption features in the x-ray spectra have been interpreted as Ultrafast Outflows (UFOs) -- highly ionised material (e.g. Fe XXV and Fe XXVI) ejected at mildly relativistic velocities. In some cases, these outflows can carry energy in excess of the binding energy of the host galaxy. Needless to say, these features demand our attention as they are strong signatures of AGN feedback and will influence galaxy evolution. For the same reason, alternative models need to be discussed and refuted or confirmed. Gallo & Fabian proposed that some of these features could arise from resonance absorption of the reflected spectrum in a layer of ionised material located above and corotating with the accretion disc. Therefore, the absorbing medium would be subjected to similar blurring effects as seen in the disc. A priori, the existence of such plasma above the disc is as plausible as a fast wind. In this work, we highlight the ambiguity by demonstrating that the a...

Gallo, L C

2013-01-01T23:59:59.000Z

472

Nucleon electromagnetic form factors and electroexcitation of low lying nucleon resonances in a light-front relativistic quark model  

Science Conference Proceedings (OSTI)

We utilize a light-front relativistic quark model (LF RQM) to predict the 3q core contribution to the electroexcitation amplitudes for the {Delta}(1232)P{sub 33}, N(1440)P{sub 11}, N(1520)D{sub 13}, and N(1535)S{sub 11} up to Q{sup 2} = 12 GeV{sup 2}. The parameters of the model have been specified via description of the nucleon electromagnetic form factors in the approach that combines 3q and pion-cloud contributions in the LF dynamics.

Aznauryan Inna, Burkert Volker

2012-05-01T23:59:59.000Z

473

CD-ROM (compact disc-read only memory): A delivery medium for CBT (computer-based training)  

SciTech Connect

Computer-based training (CBT) development has evolved from electronic page turners to a sophisticated instructional environment. The use of numerous large image files, large digital audio files, and complex computer-generated graphics files places great demands on a system's capacity for binary storage (disk space). One solution is the use of compact disc-read only memory (CD-ROM). The explosive growth of CD-ROM players in the marketplace makes CD-ROM a viable delivery medium for CBT. Recently, a CBT package for radiation protection technicians at Los Alamos National Laboratory was produced on CD-ROM. The course is delivered on a multimedia system consisting of the following: MS DOS-based computer, CD-ROM player, high-resolution video graphics array monitor, scanned color images with graphic overlays, digital audio, and mouse interface. This paper will allow the reader to assess the appropriateness of CD-ROM for a specific project, report on lessons learned from the RPT project, demonstrate that CD-ROM is within reach of the average CBT developer, and provide guidelines for successfully developing CD-ROM based CBT. This paper can serve as a basic primer on how to adapt CD-ROM as a CBT medium. Some of the technical aspects that are discussed are listed here: CD-ROM basics for CBT development, availability of low-cost development environments, file organization, optimization of CD-ROM response times, effective use of digital audio and still frame graphics, and animation with CD-ROM.

Luettgen, A.L.; Houghton, F.K.; Andrews, A.E.

1991-01-01T23:59:59.000Z

474

An analysis of the kinetics of thermal damage and movement of damage front in laser irradiated egg white  

E-Print Network (OSTI)

Some of the major applications of laser surgery involve the photocoagulation of diseased tissue, with minimal or no damage to the surrounding healthy tissue. There is a growing need for a model for the quantification of thermal damage. The models presently available in the literature assume biological tissue to be composed of a single component having a single rate of damage. But recent studies have shown that a distribution of rate parameters rather than a single rate parameter, best describes the process of thermal coagulation. This study assumes tissue to be composed of two or more components, having different rates of damage. The results of this model are then used to find an effective rate of damage for a single rate model which would yield the same end concentrations as the multi rate model. Results indicate that the difference between the single rate and the multi rate predictions is highly predominant for relatively lower power settings, for the biokinetic coefficient values used in this research. As the power is increased, a single rate model effectively describes a multi rate model, in the prediction of damage and movement of damage front. The movement of damage front was also studied experimentally using Digital Image Processing techniques. The damage model predicted by this study qualitatively follows the theoretical models available in the literature.

Azeemi, Aamer Amjed

1993-01-01T23:59:59.000Z

475

Effect of Front-Side Silver Metallization on Underlying n+-p Junction in Multicrystalline Silicon Solar Cells: Preprint  

Science Conference Proceedings (OSTI)

We report on the effect of front-side Ag metallization on the underlying n+-p junction of multicrystalline Si solar cells. The junction quality beneath the contacts was investigated by characterizing the uniformities of the electrostatic potential and doping concentration across the junction, using scanning Kelvin probe force microscopy and scanning capacitance microscopy. We investigated cells with a commercial Ag paste (DuPont PV159) and fired at furnace setting temperatures of 800 degrees, 840 degrees, and 930 degrees C, which results in actual cell temperatures ~100 degrees C lower than the setting temperature and the three cells being under-, optimal-, and over-fired. We found that the uniformity of the junction beneath the Ag contact was significantly degraded by the over-firing, whereas the junction retained good uniformity with the optimal- and under-fire temperatures. Further, Ag crystallites with widely distributed sizes from <100 nm to several ?m were found at the Ag/Si interface of the over-fired cell. Large crystallites were imaged as protrusions into Si deeper than the junction depth. However, the junction was not broken down; instead, it was reformed on the entire front of the crystallite/Si interface. We propose a mechanism of the junction-quality degradation, based on emitter Si melting at the temperature around the Ag-Si eutectic point during firing, and subsequent recrystallization with incorporation of impurities in the Ag paste and with formation of crystallographic defects during quenching.

Jiang, C. S.; Li, Z. G.; Moutinho, H. R.; Liang, L.; Ionkin, A.; Al-Jassim, M. M.

2012-06-01T23:59:59.000Z

476

Open apex shaped charge-type explosive device having special disc means with slide surface thereon to influence movement of open apex shaped charge liner during collapse of same during detonation  

DOE Patents (OSTI)

An open apex shape charge explosive device is disclosed having an inner liner defining a truncated cone, an explosive charge surrounding the truncated inner liner, a primer charge, and a disc located between the inner liner and the primer charge for directing the detonation of the primer charge around the end edge of the disc means to the explosive materials surrounding the inner liner. The disc comprises a material having one or more of: a higher compressive strength, a higher hardness, and/or a higher density than the material comprising the inner liner, thereby enabling the disc to resist deformation until the liner collapses. The disc has a slide surface thereon on which the end edge of the inner liner slides inwardly toward the vertical axis of the device during detonation of the main explosive surrounding the inner liner, to thereby facilitate the inward collapse of the inner liner. In a preferred embodiment, the geometry of the slide surface is adjusted to further control the collapse or {beta} angle of the inner liner.

Murphy, M.J.

1992-12-31T23:59:59.000Z

477

Geothermal investigations at selected thermal systems of the northern Wasatch Front Weber and Box Elder Counties, Utah. Report of investigation No. 141  

DOE Green Energy (OSTI)

Numerous thermal springs are present along the Wasatch Front from Utah valley on the south to the state line on the north. These systems are just west of the Wasatch Mountains at the eastern edge of the Basin and Range physiographic province and within the active seismic zone referred to as the Intermountain Seismic Belt. This Report of Investigation is a summary of UGMS investigations at four northern Wasatch Front geothermal systems: Utah, Crystal (Madsen), and Udy hot springs; and the Little Mountain - south system. All of these resources are deep circulation systems and the water is heated by the normal heat flow of the Basin and Range Province. Heat from volcanic sources is not believed to contribute to the warming of any northern Wasatch Front springs. Data collected under the DOE/DGE state coupled program are presented for use by individuals interested in these systems.

Murphy, P.; Gwynn, J.W.

1979-11-01T23:59:59.000Z

478

DiscLAimEr  

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

Of ENErgy ADvANcED cArbON DiOxiDE cApTurE r&D prOgrAm: TEchNOLOgy upDATE, mAy 2013 i. Annual Energy Outlook 2011 Early Release, Energy information Administration,...

479

ANL/APS/TB-44, Guidelines for Beamline and Front-End Radiation Shielding Design at the Advanced Photon Source  

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

APS/TB-44 Rev. 4 APS/TB-44 Rev. 4 Guidelines for Beamline and Front-End Radiation Shielding Design at the Advanced Photon Source Revision 4 Advanced Photon Source About Argonne National Laboratory Argonne is a U.S. Department of Energy laboratory managed by UChicago Argonne, LLC under contract DE-AC02-06CH11357. The Laboratory's main facility is outside Chicago, at 9700 South Cass Avenue, Argonne, Illinois 60439. For information about Argonne and its pioneering science and technology programs, see www.anl.gov. Availability of This Report This report is available, at no cost, at http://www.osti.gov/bridge. It is also available on paper to the U.S. Department of Energy and its contractors, for a processing fee, from: U.S. Department of Energy Office of Scientific and Technical Information

480

Optimization of DC-DC Converters for Improved Electromagnetic Compatibility With High Energy Physics Front-End Electronics  

E-Print Network (OSTI)

The upgrade of the Large Hadron Collider (LHC) experiments at CERN sets new challenges for the powering of the detectors. One of the powering schemes under study is based on DC-DC buck converters mounted on the front-end modules. The hard environmental conditions impose strict restrictions to the converters in terms of low volume, radiation and magnetic field tolerance. Furthermore, the noise emission of the switching converters must not affect the performance of the powered systems. A study of the sources and paths of noise of a synchronous buck converter has been made for identifying the critical parameters to reduce their emissions. As proof of principle, a converter was designed following the PCB layout considerations proposed and then used for powering a silicon strip module prototype for the ATLAS upgrade, in order to evaluate their compatibility.

Fuentes, C; Michelis, S; Blanchot, G; Allongue, B; Faccio, F; Orlandi, S; Kayal, M; Pontt, J

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "front disc brakes" from the National Library of EnergyBeta (NLEBeta).
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481

Gas turbine engine braking and method  

SciTech Connect

A method is described of decelerating a ground vehicle driven by a gas turbine engine having a gas generator section and a free turbine output power section driven by a gas flow from the gas generator section, comprising the steps of: altering the incidence of gas flow from the gas generator section onto the free turbine section whereby said gas flow opposes rotation of the free turbine section; increasing gas generator section speed; and subsequent to said altering and increasing steps, selectively mechanically interconnecting said gas generator and free turbine sections whereby the rotational inertia of the gas generator section tends to decelerate the free turbine section.

Mattson, G.; Woodhouse, G.

1980-07-01T23:59:59.000Z

482

Electric vehicle regenerative antiskid braking and traction ...  

Patent Number: 5,450,324: Issued: September 12, 1995: Official Filing: View the Complete Patent at the US Patent & Trademark Office: Lab: Idaho ...

483

Advanced time-stamped total data acquisition control front-end for MeV ion beam microscopy and proton beam writing  

Science Conference Proceedings (OSTI)

Many ion-matter interactions exhibit sub-@ms time dependences such as, fluorophore emission quenching and ion beam induced charge (IBIC). Conventional event-mode MeV ion microbeam data acquisition systems discard the time information. Here we describe ... Keywords: Data acquisition, FPGA, Front-end, Microbeam, Time-stamping

Henri Kivistö; Mikko Rossi; Pete Jones; Rattanaporn Norarat; Nitipon Puttaraksa; Timo Sajavaara; Mikko Laitinen; VäInö HäNninen; Kimmo Ranttila; Pauli Heikkinen; Leona Gilbert; Varpu MarjomäKi; Harry J. Whitlow

2013-02-01T23:59:59.000Z

484

The Low-Level Structure and Evolution of a Dry Arctic Front over the Central United States. Part I: Mesoscale Observations  

Science Conference Proceedings (OSTI)

Observations taken over the period 8–10 March 1992 during the Storm-scale Operational and Research Meteorology Fronts Experiment Systems Test in the central United States are used to document the detailed low-level structure and evolution of a ...

L. Jay Miller; Margaret A. LeMone; William Blumen; Robert L. Grossman; Nimal Gamage; Robert J. Zamora

1996-08-01T23:59:59.000Z

485

The Intensification of the Low-Level Jet during the Development of Mesoscale Convective Systems on a Mei-Yu Front  

Science Conference Proceedings (OSTI)

During the period of 21–25 June 1991, a mei-yu front, observed by the post–Taiwan Area Mesoscale Experiment, produced heavy precipitation along the western side of the Central Mountain Range of Taiwan. Several oceanic mesoscale convective systems ...

Chaing Chen; Wei-Kuo Tao; Pay-Liam Lin; George S. Lai; S-F. Tseng; Tai-Chi Chen Wang

1998-02-01T23:59:59.000Z

486

An Observational and Numerical Study of an Intense Landfalling Cold Front along the Northwest Coast of the United States during COAST IOP 2  

Science Conference Proceedings (OSTI)

This paper presents an observational and numerical study of an intense wintertime cold front that made landfall along the northwest coast of the United States during IOP 2 (3–4 Dec 1993) of the Coastal Observation and Simulation with Topography ...

Fang-Ching Chien; Clifford F. Mass; Paul J. Neiman

2001-05-01T23:59:59.000Z

487

Initiation and Organizational Modes of an Extreme-Rain-Producing Mesoscale Convective System along a Mei-Yu Front in East China  

Science Conference Proceedings (OSTI)

The initiation and organization of a quasi-linear extreme-rain-producing mesoscale convective system (MCS) along a Meiyu front in East China during the midnight-to-morning hours of 8 July 2007 are studied using high-resolution surface observations ...

Yali Luo; Yu Gong; Da-Lin Zhang

488

Lagrangian H/U3 Values Computed around Fronts Using a Fine-Resolution Numerical Model and Ferryboat-Monitored SST Dataset  

Science Conference Proceedings (OSTI)

Front locations are identified as the local maximum of the sea surface temperature gradient revealed in the continuously ferryboat-monitored data in the Seto Inland Sea, Japan. In addition, Simpson and Hunter’s H/U3 values, where H is the water ...

Youn-Jong Sun; Atsuhiko Isobe

2008-11-01T23:59:59.000Z

489

The IMPROVE-1 Storm of 1–2 February 2001. Part I: Development of a Forward-Tilted Cold Front and a Warm Occlusion  

Science Conference Proceedings (OSTI)

Analysis of observations and the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5) are used to study the development of a forward-tilted cold front off the coast of Washington ...

John D. Locatelli; Mark T. Stoelinga; Matthew F. Garvert; Peter V. Hobbs

2005-10-01T23:59:59.000Z

490

Orographic Effects and Evaporative Cooling along a Subtropical Cold Front: The Case of the Spectacular Saharan Dust Outbreak of March 2004  

Science Conference Proceedings (OSTI)

On 2 March 2004 a marked upper-level trough and an associated surface cold front penetrated into the Sahara. High winds along and behind this frontal system led to an extraordinary, large-scale, and long-lived dust outbreak, accompanied by ...

Gregor Gläser; Peter Knippertz; Bernd Heinold

2012-08-01T23:59:59.000Z

491

Idealized Two-Dimensional Modeling of a Coastal Buoyancy Front, or River Plume, under Downwelling-Favorable Wind Forcing with Application to the Alaska Coastal Current  

Science Conference Proceedings (OSTI)

The cross-shelf structure of a buoyancy-driven coastal current, such as produced by a river plume, is modeled in a two-dimensional cross-shelf slice as a “wide” geostrophically balanced buoyancy front. Downwelling-favorable wind stress applied to ...

William J. Williams; Thomas J. Weingartner; Albert J. Hermann

2010-02-01T23:59:59.000Z

492

FPI (Islamic Defenders' Front): the Making of a Violent Islamist Movement in the New Democracy of Indonesia  

E-Print Network (OSTI)

The current study is aimed at investigating the puzzle of why FPI (Islamic Defenders' Front) has chosen to adopt violent strategies within the democratic context of Indonesia. Much of literature on social movements suggests that democracy is inherently nonviolent because it allows social movements to use a number of reasonable tactics to pursue their goals. On the contrary, authoritarianism is considered to be the cause of the emergence of violent movements. However, a violent movement is not necessarily absent in the context of democracy. Using the language of Islam, justice and democracy, FPI (Islamic Defender's Front) conspicuously committed at least 64 cases of violent collective actions from 1998 to 2010. Three levels of analysis are used in order to investigate this social puzzle, namely the level of organization, individual characters and FPI's violent actions. Combining these three levels of analysis, this study found that the making of the violent Islamist movement (FPI) is complex and interconnected. First, there are at least four social environments that have led FPI to the adoption of violent means. They are the historical context of Islamist movements in Indonesia (1945-1998), the timing of violence by FPI, social support for FPI's violent actions and low state capacity. Second, there are at least four factors that relate to individuals and organization of FPI. They are FPI's encounter with so-called justified violence, FPI's engagement in violence-prone activities, fundamentalism and FPI's framing of its violent actions. Combining these factors has made FPI's violence become more persistent in the new democratic context of Indonesia. Consequently, despite the fact that democracy inhibits political violence, democracy may also allow the use of violent means by social movements. In doing so, democracy opens an opportunity for people, especially elites, to support the cause of violence. Therefore, this can undermine the government's will to fully suppress the violent movement. In addition, there are other significant factors, other than state repression, that also facilitate violence, such as a movement's choice to engage in violence-prone activities, low state capacity, a good timing of violence (cultural resources) and a good framing of violence.

Munajat

2012-05-01T23:59:59.000Z

493

Quantitative Discomanometry: Correlation of Intradiscal Pressure Values to Pain Reduction in Patients With Intervertebral Disc Herniation Treated With Percutaneous, Minimally Invasive, Image-Guided Techniques  

Science Conference Proceedings (OSTI)

Purpose: To illustrate quantitative discomanometry's (QD) diagnostic efficacy and predictive value in discogenic-pain evaluation in a prospective study correlating intradiscal pressure values with pain reduction after percutaneous image-guided technique (i.e., percutaneous decompression, PD). Materials and Methods: During the last 3 years, 36 patients [21 male and 15 female (mean age 36 {+-} 5.8 years)] with intervertebral disc hernia underwent QD before PD. Under absolute sterilization and fluoroscopy, a mixture of contrast medium and normal saline (3:1 ratio) was injected. A discmonitor performed a constant rate injection and recorded pressure and volume values, thus producing the relative pressure-volume curve. PD was then performed. Pain reduction and improved mobility were recorded at 3, 12, and 24 months after PD using clinical evaluation and a numeric visual scale (NVS; 0 to 10 units). Results: Mean pain values of 7.5 {+-} 1.9 (range 4 to 8) NVS units were recorded before PD; these decreased to 2.9 {+-} 2.44 at 3 months, 1.0 {+-} 1.9 at 12 months, and 1.0 {+-} 1.9 NVS units at 24 months after PD. Recorded correlations (pressure, volume, significant pain-reduction values) with bilateral statistical significance included a maximum injected volume of 2.4 ml (p = 0.045), P{sub o} 4 NVS units) after PD. No complications were noted. Conclusions: QD is an efficient technique that may have predictive value for discogenic pain evaluation. It might serve as a useful tool for patient selection for intervertebral disc therapies.

Filippiadis, Dimitrios K., E-mail: dfilippiadis@yahoo.gr; Mazioti, A., E-mail: argyromazioti@yahoo.gr; Papakonstantinou, O., E-mail: sogofianol@gmail.com; Brountzos, E., E-mail: ebrountz@med.uoa.gr [University General Hospital 'Attikon', Second Radiology Department (Greece); Gouliamos, A., E-mail: agouliam@med.uoa.gr [University General Hospital 'Areteion', First Radiology Department (Greece); Kelekis, N., E-mail: kelnik@med.uoa.gr; Kelekis, A., E-mail: akelekis@med.uoa.gr [University General Hospital 'Attikon', Second Radiology Department (Greece)

2012-10-15T23:59:59.000Z

494

Parameter Estimation and Supervisory Techniques for Robust Longitudinal Control of Heavy Vehicles  

E-Print Network (OSTI)

plot) and brake pressure in Volt at the front left wheel (fuel circuit is below 0.5 Volt). Although the actuators can,command (between 0 and 10 Volt), they were limited within a

Druzhinina, Maria; Moklegaard, Lasse; Stefanopoulou, Anna G.

2003-01-01T23:59:59.000Z

495

Identification and Integration of Commercial Heavy Vehicle Retarders  

E-Print Network (OSTI)

plot) and brake pressure in Volt at the front left wheel (fuel circuit is below 0.5 Volt). Although the actuators can,command (between 0 and 10 Volt), they were limited within a

Druzhinina, Maria; Moklegaard, Lasse; Stefanopoulou, Anna G.

2002-01-01T23:59:59.000Z

496

New Vision front  

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

GRID 2030" GRID 2030" A NATIONAL VISION FOR ELECTRICITY'S SECOND 100 YEARS July 2003 United States Department of Energy Office of Electric Transmission and Distribution Transforming the Grid to Revolutionize Electric Power in North America Transforming the Grid to Revolutionize Electric Power in North America Transforming the Grid to Revolutionize Electric Power in North America Transforming the Grid to Revolutionize Electric Power in North America . . i "Grid 2030" - A National Vision for Electricity's Second 100 Years A CALL FOR LEADERSHIP Accessible, abundant, and affordable electric power is one of the cornerstones of the U.S. economy. On February 6, 2003 President Bush highlighted the need to "...modernize our electric delivery system...for economic security...and for national security." The U.S. Department of

497

Front Matter Template  

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

RPSEA RPSEA Final Report 08123.02.Final Field Demonstration of Alkaline Surfactant Polymer Floods in Mature Oil Reservoirs, Brookshire Dome, Texas October 21, 2012 Chris Lewis Layline Petroleum LLC PI-Mukul M. Sharma Bo Gao The University of Texas at Austin 200 E. Dean Keeton St. Stop C0300 Austin, Texas 78712 (512) 471-3257 msharma@mail.utexas.edu 2 LEGAL NOTICE This report was prepared by Layline Petroleum LLC as an account of work sponsored by the Research Partnership to Secure Energy for America, RPSEA. Neither RPSEA, members of RPSEA, the National Energy Technology Laboratory, the U.S. Department of Energy, nor any person acting on behalf of any of the entities: a. MAKES ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED WITH RESPECT TO ACCURACY, COMPLETENESS, OR USEFULNESS

498

New Vision front  

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

3 3 United States Department of Energy Office of Electric Transmission and Distribution . . A National Vision for Electricity's Second 100 Years A National Vision for Electricity's Second 100 Years A National Vision for Electricity's Second 100 Years A National Vision for Electricity's Second 100 Years "GRID 2030" United States Department of Energy Office of Electric Transmission and Distribution . . Based on the Results of the National Electric System Vision Meeting Washington, DC April 2-3, 2003 July 2003 "GRID 2030" A NATIONAL VISION FOR ELECTRICITY'S SECOND 100 YEARS Transforming the Grid to Revolutionize Electric Power in North America i "Grid 2030" - A National Vision for Electricity's Second 100 Years A CALL FOR LEADERSHIP Accessible, abundant, and affordable electric power is one of the

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New Vision front  

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

4 4 United States Department of Energy Office of Electric Transmission and Distribution . . NATIONAL ELECTRIC DELIVERY TECHNOLOGIES ROADMAP Transforming the Grid to Revolutionize Electric Power in North America Transforming the Grid to Revolutionize Electric Power in North America Transforming the Grid to Revolutionize Electric Power in North America Transforming the Grid to Revolutionize Electric Power in North America United States Department of Energy Office of Electric Transmission and Distribution . . Based on the Results of the National Electric Delivery Technologies Roadmap Workshop Washington, DC July 8-9, 2003 January 2004 NATIONAL ELECTRIC DELIVERY TECHNOLOGIES ROADMAP - DESIGNING "GRID 2030" ARCHITECTURE - - DEVELOPING CRITICAL TECHNOLOGIES -

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NETL Report Cover (Front)  

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DOE Award No.: DE-FE0001243 Topical Report LAND AND RESOURCE MANAGEMENT ISSUES RELEVANT TO DEPLOYING IN-SITU THERMAL TECHNOLOGIES Submitted by: University of Utah Institute for Clean and Secure Energy 155 South 1452 East, Room 380 Salt Lake City, Utah 84112 Prepared for: United States Department of Energy National Energy Technology Laboratory January, 2011 Office of Fossil Energy LAND A ND R ESOURCE M ANAGEMENT I SSUES R ELEVANT T O D EPLOYING IN---SITU T HERMAL T ECHNOLOGIES Topical Report Reporting P eriod: O ctober 3 1, 2 009 t hrough D ecember 3 1, 2 010 Principal A uthors: R obert K eiter, J ohn R uple, H eather T anana, a nd M ichelle K line Report I ssued: J anuary 2 011 DOE A ward N o.: D E---FE0001243 University o f U tah Institute f or C lean a nd S ecure E nergy