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Note: This page contains sample records for the topic "jordana jet propulsion" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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1

Strategic Technology JET PROPULSION LABORATORY  

E-Print Network [OSTI]

Strategic Technology Directions JET PROPULSION LABORATORY National Aeronautics and Space Administration 2 0 0 9 #12;© 2009 California Institute of Technology. Government sponsorship acknowledged. #12;Strategic Technology Directions 2009 offers a distillation of technologies, their links to space missions

Waliser, Duane E.

2

Principles of Jet Propulsion and Gas Turbines  

Science Journals Connector (OSTI)

... the presentation of the basic theory of jet propulsion and the thermodynamics of the gas-turbine and rocket types of engine. The layout follows a logical sequence, on the whole ... reader is treated to the now well-known thermodynamic analysis of the power-producing gas turbine cycle, which seems rather misplaced in a book dealing with jet propulsion. In his ...

S. J. MOYES

1949-08-06T23:59:59.000Z

3

Cover: Mariner 9 spacecraft. JET PROPULSION  

E-Print Network [OSTI]

#12;Cover: Mariner 9 spacecraft. #12;JET PROPULSION LABORATORY 1971 ANNUAL REPORT A descrtptlon Jet Propulsion Laboratory CALIFORNIA INSTITUTE OF TECHNOLOGY 4800 OAK GROVE DRIVE PASADENA, CALIFORNIA 91103 #12;#12;DIRECTOR'S MESSAGE The successful orbiting of Mariner 9 around the planet Mars

Waliser, Duane E.

4

JET PROPULSION LABORATORY 1979 Annual Report  

E-Print Network [OSTI]

, is the most active and complex volcanic body in our solar system and has a surface composed primarily of Technology and the National Aeronautics and Space Administration for the period January 1 to December 31 JPL Technology Institutional Activities JET PROPULSION LABORATORY California Institute of Technology

Waliser, Duane E.

5

Thermoelectric Microdevice Fabrication Process and Evaluation at the Jet Propulsion Laboratory (JPL)  

E-Print Network [OSTI]

system), radioisotope thermoelectric generators (RTGs) are used for power [1]. Thermoelectric devicesThermoelectric Microdevice Fabrication Process and Evaluation at the Jet Propulsion Laboratory (JPL of integrated thermal management and power management and distribution. Micro thermoelectric converters

6

Photochemistry of ,,OCS...n cluster ions Andrei Sanov, Sreela Nandi, Kenneth D. Jordan,a)  

E-Print Network [OSTI]

Photochemistry of ,,OCS...n cluster ions Andrei Sanov, Sreela Nandi, Kenneth D. Jordan,a) and W, and back to (CO2)2 for n 13. Fleischman and Jordan predicted, based on electronic structure calculations

Sanov, Andrei

7

The methodology of variable management of propellant fuel consumption by jet-propulsion engines of a spacecraft  

Science Journals Connector (OSTI)

Traditionally, management of propellant fuel consumption on board of a spacecraft is only associated with the operation of jet-propulsion engines (JPE) that are actuator devices of ... systems (MCS). The efficien...

V. S. Kovtun

2012-12-01T23:59:59.000Z

8

Batteries and fuel cell research Sri Narayan worked for 20 years at NASA's Jet Propulsion Laboratory (JPL) where he led the  

E-Print Network [OSTI]

Batteries and fuel cell research Sri Narayan worked for 20 years at NASA's Jet Propulsion California Los Angeles, CA 90089-1661 The USC Power Research Workshop, November 18, 2011 Batteries and Fuel Laboratory (JPL) where he led the fuel cell research activities for over 15 years and also headed

Levi, Anthony F. J.

9

An investigation of the entrainment effects of a propulsive jet on the base pressure of blunt based bodies  

E-Print Network [OSTI]

associated with factory and power plant emission plumes. The entrainment rate of the free jet is an important aspect of the free jet flow. In the case of the emission plumes of fac- tory and power plants, the entrainment rate of the jet is a mea- sure... and transition regions of the free jet. Now recall equation (6) for the potential inflow velocity. Note that here the entrainment rate is a volumetric rats. Nanipu- lating equation (9) to obtain a volumetric rate, one obtains (12) 29 Noting that ~ K...

Berry, Ronald Allen

2012-06-07T23:59:59.000Z

10

Jet Jet Jet Jet  

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

protons protons top quark bottom quark muon top quark antiprotons bottom quark low energy muon quark quark - W boson + Jet Jet Jet Jet neutrino W boson particles antiparticles A Top Antitop Quark Event from the D-Zero Detector at Fermilab muon low energy muon Jet Jet Jet Jet particles antiparticles Particles Seen by the D-Zero Detector at Fermilab in a Top Antitop Quark Event. DST LEGO 16-JUL-1996 15:32 Run 92704 Event 14022 9-JUL-1995 13:17 MUON MUON Miss ET ET DST ETA-PHI 4 MUON 1 MISS ET 4 JET (HAD) (EM) D-Zero Detector at Fermi National Accelerator Laboratory Lego Plot CAL+TKS END VIEW 16-JUL-1996 15:33 Run 92704 Event 14022 9-JUL-1995 13:17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

Software Engineering for Space Exploration Iowa State University and Jet Propulsion Laboratory/California Institute of Technology  

E-Print Network [OSTI]

Safety. 1. Software engineering plays a vital role in space exploration Innovations in robotic spacecraft systems. For example, radiation-caused bit flips may result in software failure or unexpected software1 Software Engineering for Space Exploration Robyn Lutz Iowa State University and Jet

Lutz, Robyn R.

12

Electric Propulsion  

Science Journals Connector (OSTI)

...is clear. The long-t?me continuous operation is required for electric propulsion pri-marily...travel against a small voltage to the cold element. The cell thereby produces an...concentrate and focus the solar rays on a heater. Little, if any, decrease in specific...

W. E. Moeckel

1963-10-11T23:59:59.000Z

13

E-Print Network 3.0 - advanced space propulsion Sample Search...  

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

Summary: for space drilling. The Jet Propulsion Laboratory's (JPL) ultrasonicsonic drillercorer (USDC... 1 Design and Modeling of the NU Smart Space Drilling System (SSDS)...

14

Swimming dynamics and propulsive efficiency of squids throughout ontogeny  

E-Print Network [OSTI]

Swimming dynamics and propulsive efficiency of squids throughout ontogeny Ian K. Bartol,1,� Paul S and propulsive efficiency change throughout ontogeny, digital particle image velocimetry (DPIV) and kinematic Lolliguncula brevis swimming in a holding chamber or water tunnel (Re ¼ 20­20 000). Jet and fin wake bulk

Hynes, Wayne L.

15

JET PROPULSION LASORATORY 1984 Annual Report  

E-Print Network [OSTI]

. and silicates. These are the materials from which the comets, asteroids. and planets of our own solar system and JPL received approval to begin the Mars Observer. The next proposed core mission, the Comet Rendezvous challenges that lie ahead. Increased appreciation of Earth as a planet where land, sea, and air interact

Waliser, Duane E.

16

PUBLIC INFORMATION OFFICE JET PROPULSION LABORATORY  

E-Print Network [OSTI]

, and which become ionized, or charged, in the solar wind. Eventually, they reach energies at which the solar wind is speeding at double the rate normally found at lower latitudes. Measurements from Ulysses' solar wind plasma experiment, presented today at the 1993 fall meeting of the American Geophysical Union

Christian, Eric

17

Efficiency of Fish Propulsion  

E-Print Network [OSTI]

It is shown that the system efficiency of a self-propelled flexible body is ill-defined unless one considers the concept of quasi-propulsive efficiency, defined as the ratio of the power needed to tow a body in rigid-straight condition over the power it needs for self-propulsion, both measured for the same speed. Through examples we show that the quasi-propulsive efficiency is the only rational non-dimensional metric of the propulsive fitness of fish and fish-like mechanisms. Using two-dimensional viscous simulations and the concept of quasi-propulsive efficiency, we discuss the efficiency two-dimensional undulating foils. We show that low efficiencies, due to adverse body-propulsor hydrodynamic interactions, cannot be accounted for by the increase in friction drag.

Maertens, A P; Yue, D K P

2014-01-01T23:59:59.000Z

18

Marine Nuclear Propulsion  

Science Journals Connector (OSTI)

... June 30 about 95 qualified scientists and engineers were engaged on research and development on marine nuclear ... nuclear propulsion within his Department, including the Atomic Energy Authority and the Ship Research Association. This ...

1965-07-31T23:59:59.000Z

19

Induction-drive magnetohydrodynamic propulsion  

Science Journals Connector (OSTI)

The use of magnetohydrodynamic propulsion for marine applications is reviewed with emphasis on induction- ... . Comparisons are made with direct-drive MHD propulsion systems. Application to pumps for hazardous fl...

D. L. Mitchell; D. U. Gubser

1993-08-01T23:59:59.000Z

20

A new marine propulsion system  

Science Journals Connector (OSTI)

A new marine propulsion system is proposed. A small liquid sodium ... thruster combined with spray-water thruster works as propulsion. The configuration and characteristics of this system are described. Such a nu...

Wei-shi Han; Tao Liu

2003-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Thermodynamics and rocket propulsion  

Science Journals Connector (OSTI)

Thermodynamics and rocket propulsion ... This paper outlines the application of the principles of chemical thermodynamics to a comparison of the merit of one rocket propellant (fuel plus oxidizer) with that of another fuel-oxidizer pair for liquid-fueled rocket motors. ... Thermodynamics ...

Frank H. Verhoek

1969-01-01T23:59:59.000Z

22

Hypersonic missile propulsion system  

SciTech Connect (OSTI)

Pratt and Whitney is developing the technology for hypersonic components and engines. A supersonic combustion ramjet (scramjet) database was developed using hydrogen fueled propulsion systems for space access vehicles and serves as a point of departure for the current development of hydrocarbon scramjets. The Air Force Hypersonic Technology (HyTech) Program has put programs in place to develop the technologies necessary to demonstrate the operability, performance and structural durability of an expendable, liquid hydrocarbon fueled scramjet system that operates from Mach 4 to 8. This program will culminate in a flight type engine test at representative flight conditions. The hypersonic technology base that will be developed and demonstrated under HyTech will establish the foundation to enable hypersonic propulsion systems for a broad range of air vehicle applications from missiles to space access vehicles. A hypersonic missile flight demonstration is planned in the DARPA Affordable Rapid Response Missile Demonstrator (ARRMD) program in 2001.

Kazmar, R.R.

1998-11-01T23:59:59.000Z

23

Vehicle Technologies Office: Propulsion Materials  

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

Materials Materials Manufacturers use propulsion (or powertrain) materials in the components that move vehicles of every size and shape. Conventional vehicles use these materials in components such as the engine, transmission, fuel system, and exhaust after-treatment systems. Electric drive vehicles use propulsion materials in their electric motors and power electronics. Developing advanced propulsion materials is essential to commercializing new, highly efficient automotive technologies that have technical requirements that existing powertrain materials cannot meet. The Vehicle Technology Office's (VTO) research in propulsion materials focuses on four areas: Materials for hybrid and electric drive systems Materials for high efficiency combustion engines Materials to enable energy recovery systems and control exhaust gases

24

‘Optimal’ vortex rings and aquatic propulsion mechanisms  

Science Journals Connector (OSTI)

...vortex rings and aquatic propulsion mechanisms P. F. Linden...fluid mechanics behind these propulsion mechanisms and show that...over the cycle. 4. FISH PROPULSION BY UNDULATORY SWIMMING Most marine organisms have only discrete...

2004-01-01T23:59:59.000Z

25

Life Cycle Modeling of Propulsion Materials  

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

propulsion materials manufacturing technologies with an emphasis on aluminum, magnesium, titanium, and ceramics * Advanced propulsion materials' potential in heavy-duty...

26

Advanced Propulsion Technology Strategy | Department of Energy  

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

Propulsion Technology Strategy Advanced Propulsion Technology Strategy GM is also developing new classes of electrically driven vehicles, leveraging technology first used in their...

27

Jet Observables Without Jet Algorithms  

E-Print Network [OSTI]

We introduce a new class of event shapes to characterize the jet-like structure of an event. Like traditional event shapes, our observables are infrared/collinear safe and involve a sum over all hadrons in an event, but like a jet clustering algorithm, they incorporate a jet radius parameter and a transverse momentum cut. Three of the ubiquitous jet-based observables---jet multiplicity, summed scalar transverse momentum, and missing transverse momentum---have event shape counterparts that are closely correlated with their jet-based cousins. Due to their "local" computational structure, these jet-like event shapes could potentially be used for trigger-level event selection at the LHC. Intriguingly, the jet multiplicity event shape typically takes on non-integer values, highlighting the inherent ambiguity in defining jets. By inverting jet multiplicity, we show how to characterize the transverse momentum of the n-th hardest jet without actually finding the constituents of that jet. Since many physics applications do require knowledge about the jet constituents, we also build a hybrid event shape that incorporates (local) jet clustering information. As a straightforward application of our general technique, we derive an event-shape version of jet trimming, allowing event-wide jet grooming without explicit jet identification. Finally, we briefly mention possible applications of our method for jet substructure studies.

Daniele Bertolini; Tucker Chan; Jesse Thaler

2013-10-28T23:59:59.000Z

28

COGAS propulsion for LNG ships  

Science Journals Connector (OSTI)

Propulsion of liquefied natural gas (LNG) ships is undergoing significant change. The traditional steam plant is losing favor because of its low cycle efficiency. Medium-speed diesel-electric and slow-speed di...

Edwin G. Wiggins

2011-06-01T23:59:59.000Z

29

Vorticity structure and evolution in a transverse jet with new algorithms for scalable particle simulation  

E-Print Network [OSTI]

Transverse jets arise in many applications, including propulsion, effluent dispersion, oil field flows, V/STOL aerodynamics, and drug delivery. Furthermore, they exemplify flows dominated by coherent structures that cascade ...

Marzouk, Youssef M. (Youssef Mohamed)

2004-01-01T23:59:59.000Z

30

Nuclear Propulsion in Space (1968)  

ScienceCinema (OSTI)

Project NERVA was an acronym for Nuclear Engine for Rocket Vehicle Application, a joint program of the U.S. Atomic Energy Commission and NASA managed by the Space Nuclear Propulsion Office (SNPO) at the Nuclear Rocket Development Station in Jackass Flats, Nevada U.S.A. Between 1959 and 1972, the Space Nuclear Propulsion Office oversaw 23 reactor tests, both the program and the office ended at the end of 1972.

None

2014-06-17T23:59:59.000Z

31

Nuclear Propulsion in Space (1968)  

SciTech Connect (OSTI)

Project NERVA was an acronym for Nuclear Engine for Rocket Vehicle Application, a joint program of the U.S. Atomic Energy Commission and NASA managed by the Space Nuclear Propulsion Office (SNPO) at the Nuclear Rocket Development Station in Jackass Flats, Nevada U.S.A. Between 1959 and 1972, the Space Nuclear Propulsion Office oversaw 23 reactor tests, both the program and the office ended at the end of 1972.

None

2012-06-23T23:59:59.000Z

32

Full Fuel-Cycle Comparison of Forklift Propulsion Systems | Department...  

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

Full Fuel-Cycle Comparison of Forklift Propulsion Systems Full Fuel-Cycle Comparison of Forklift Propulsion Systems This report examines forklift propulsion systems and addresses...

33

Wind Turbines for Marine Propulsion  

Science Journals Connector (OSTI)

ABSTRACT The design and construction of an horizontal axis wind turbine drive for a small yacht is described. This system has been designed to test the performance of this novel type of propulsion for use in commercial shipping, the fisheries industry and for the recreational market. The use of wind turbines to harness the power available from the wind for propulsion purposes offers a number of distinct advantages over other wind propulsion systems. Propulsion is achieved in all directions of travel relative to the wind. Complete control of the system can be arranged from a remote control position such as the ships bridge. This control can be achieved with a small crew because of the opportunities for applying powered and automated control systems. The way in which each of these features is achieved, together with details of the rotor, shafting and gear-train arrangements are described here. An indication is given of the theoretical performance of the yacht under this form of propulsion.

N. Bose; R.C. McGregor

1984-01-01T23:59:59.000Z

34

Marine propulsion device with engine heat recovery system and streamlining hull closures  

SciTech Connect (OSTI)

A Marine Jet Propulsion System for use as an inboard engine for boats is herein described. An engine or motor means is attached in a driving relationship to a pump and thrust output apparatus. Heat generated by and rejected by the engine or motor is passed into the pump base for dissipation into the outputted jet thrust stream. Air and/or exhaust gas from the engine is ejected around the jet output stream to reduce against-the-hull turbulence and jet stream or thrust energy losses. Streamlining hull closures for the jet pump intake and output ports are provided to reduce system hull drag when not in use and to limit marine organism growth inside the pump.

Haynes, H. W.

1985-11-12T23:59:59.000Z

35

Elastic tail propulsion at low Reynolds number  

E-Print Network [OSTI]

A simple way to generate propulsion at low Reynolds number is to periodically oscillate a passive flexible filament. Here we present a macroscopic experimental investigation of such a propulsive mechanism. A robotic swimmer ...

Yu, Tony S. (Tony Sheung)

2007-01-01T23:59:59.000Z

36

Numerical study on active wave devouring propulsion  

Science Journals Connector (OSTI)

The possibility of extracting energy from gravity waves for marine propulsion was numerically studied by a two-dimensional...

Liyanarachchi Waruna Arampath De Silva…

2012-09-01T23:59:59.000Z

37

The Progress of Marine Propulsion  

Science Journals Connector (OSTI)

... ships. Inventions, improvements, innovations have followed in rapid succession, and the history of marine engineering presents an endless and bewildering variety of engines and boilers which have been adopted ... so many rival methods of driving ships as they have to-day, each method of propulsion making by its performance or promise some claim to consideration. Modern ...

EDGAR C. SMITH

1929-03-09T23:59:59.000Z

38

PROPULSION AND ENERGY Terrestrial energy  

E-Print Network [OSTI]

PROPULSION AND ENERGY Terrestrial energy On the morning of Monday, August 29, Hurri- cane Katrina dependence we all have on power and energy systems. Nine major oil re- fineries in Louisiana and Mississippi- trial energy community is the question of why alternative energy sources, such as coal, solar, wind

Aggarwal, Suresh K.

39

National Aeronautics and Space Administration Jet Propulsion Laboratory  

E-Print Network [OSTI]

included developments in such diverse areas as cosmic buckyball science, Earth remote sensing, comet a comet -- the smallest such body ever visited, one described by our scientists as "hy- peractive, small flight events including landings and arrivals. But I was especially proud of how we were able to help

Waliser, Duane E.

40

Jet Propulsion Laboratory 1972-1973 Annual Report  

E-Print Network [OSTI]

flyby, solar-electric powered space- craft to Comet Encke in the 1980s. In an effort to effect, and two Mariner-class vehicles for 1977 launch to Jupiter and Saturn. Although the Laboratory has experi

Waliser, Duane E.

Note: This page contains sample records for the topic "jordana jet propulsion" 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

SUNITA PAYRA VERMA Jet Propulsion Laboratory, California Institute of Technology  

E-Print Network [OSTI]

Associate · In project entitled "Scale up to obtain super clean coal - Organo-refining and identification

42

National Aeronautics and Space Administration Jet Propulsion Laboratory  

E-Print Network [OSTI]

Materials and Devices 32 Submillimeter-Wave Advanced Technologies 36 Nano and Micro Systems 40 Microfluidics

43

NASA's Jet Propulsion Laboratory Pasadena, California 91109-8099  

E-Print Network [OSTI]

Government nor any person acting on behalf of the United States Government assumes any liability resulting privately owned rights. If trade names or manufacturers' names are used in this report by utilizing the transient response of a current pulse. The performance of such a device, using (Bi,Sb)2Te3

Chen, Gang

44

Astrophysical Jets  

SciTech Connect (OSTI)

Many astrophysical sources - especially those powered by release of gravitational energy - are associated with an outflow of material, generally taking place along the axis of symmetry of the system. In the most extreme cases, the outflow is accelerated to relativistic speeds; such a phenomenon is known as an astrophysical jet. When a relativistic jet points close to our line of sight, the observed radiation is strongly Doppler-boosted. Most spectacular cases of astrophysical jets are those produced by active galactic nuclei, where the measured spectrum - presumably dominated by the radiation from the jet - reaches up to the multi-GeV range. Our knowledge of these jets is limited: we don't fully understand how are they formed, collimated, and accelerated, and what is the process of conversion of the bulk energy of the jet into radiation. We anticipate that the increased sensitivity of GLAST will provide us with spectacular data yielding new insights as to their origin and structure.

Madejski, Grzegorz (SLAC) [SLAC

2006-05-01T23:59:59.000Z

45

Stellar jets  

E-Print Network [OSTI]

With a goal of understanding the conditions under which jets might be produced in novae and related objects, I consider the conditions under which jets are produced from other classes of accreting compact objects. I give an overview of accretion disk spectral states, including a discussion of in which states these jets are seen. I highlight the differences between neutron stars and black holes, which may help give us insights about when and how the presence of a solid surface may help or inhibit jet production.

Thomas J. Maccarone

2008-05-23T23:59:59.000Z

46

Gravitomagnetic jets  

SciTech Connect (OSTI)

We present a family of dynamic rotating cylindrically symmetric Ricci-flat gravitational fields whose geodesic motions have the structure of gravitomagnetic jets. These correspond to helical motions of free test particles up and down parallel to the axis of cylindrical symmetry and are reminiscent of the motion of test charges in a magnetic field. The speed of a test particle in a gravitomagnetic jet asymptotically approaches the speed of light. Moreover, numerical evidence suggests that jets are attractors. The possible implications of our results for the role of gravitomagnetism in the formation of astrophysical jets are briefly discussed.

Chicone, C.; Mashhoon, B. [Department of Mathematics and Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211 (United States); Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211 (United States)

2011-03-15T23:59:59.000Z

47

HybriDrive Propulsion System  

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

HybriDrive HybriDrive ® Propulsion System Cleaner, smarter power for transit DOE/FTA Fuel Cell Research Priorities Workshop Washington, DC 7 June 2010 Bart W. Mancini Sr. Principal Systems Engineer BAE Systems Ph: 607-770-4103 bart.mancini@baesystems.com 2 Overview 3 * BAE Systems FC Experience / Deployments * Technology gaps/barriers to full commercialization of fuel cell buses * Well-to-wheels energy efficiency and emissions * Cost metrics * Bus integration issues * Fuel cell bus R&D needs * Future plans BAE Systems FC Experience / Deployments 4 * 1998 - Georgetown/FTA/DOE Fuel Cell Bus #1 (still serviceable) * UTC 100 kW Phosphoric Acid FC using on-board Methanol Reformate, Hybrid propulsion & Electric accessories * 2000 - Georgetown/FTA/DOE Fuel Cell Bus #2 (retired) *

48

Experimental confirmation of the propulsion of marine vessels employing guided flexural waves in attached elastic fins  

Science Journals Connector (OSTI)

This paper describes the results of the first experimental verification of the idea of wave-like aquatic propulsion of manned marine vessels first published by the first author in 1994. The idea is based on employing the unique type of guided flexural elastic waves propagating along edges of immersed wedge-like structures attached to a body of a small ship or a submarine as keels or wings and used for the propulsion. The principle of employing such guided flexural waves as a source of aquatic propulsion is similar to that used in nature by stingrays. It is vitally important for the application of this idea to manned vessels that, in spite of vibration of the fins, the main body of the craft remains undisturbed as the energy of guided elastic waves is concentrated away from it. The main expected advantages of this new propulsion method over the existing ones, e.g. jets and propellers, are the following: it is quiet, and it is environmentally friendly and safe for people and wildlife. To verify the idea experimentally, the first working prototype of a small catamaran using the above-mentioned wave-like propulsion via the attached rubber keel has been built and tested. The test results have shown that the catamaran was propelled efficiently and could achieve the speed of 36 cm/s, thus demonstrating that the idea of wave-like propulsion of manned craft is viable. The reported proof of the viability of this idea may open new opportunities for marine craft propulsion, which can have far-reaching implications.

V.V. Krylov; G.V. Pritchard

2007-01-01T23:59:59.000Z

49

Centenary of Practical Marine Screw Propulsion  

Science Journals Connector (OSTI)

... To mark the centenary of practical marine screw ... screw propulsion, a special exhibit was opened at the Science Museum, South Kensington, on February ...

1937-02-13T23:59:59.000Z

50

Low Cost Titanium ? Propulsion Applications | Department of...  

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

Applications Low Cost Titanium Propulsion Applications 2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer...

51

Propulsive performance from oscillating propulsors with spanwise flexibility  

Science Journals Connector (OSTI)

...dimensional oscillating foil propulsion. M.Eng. thesis...Bose, N. 1991 Propulsion from an oscillating...planform. In Proc. Marine Dynamics Conf. 1991...Hydromechanics of swimming propulsion. Part 1. Swimming...Canada, Institute of Marine Dynamics report, no...

1997-01-01T23:59:59.000Z

52

Self Excited Vibration in a Specialised Electric Propulsion System  

Science Journals Connector (OSTI)

Special marine propulsion applications demand efficient manoeuvrability under extreme conditions. ... , vibration resonance and radiated noise from the propulsion shafting system must be kept to a ... purpose ves...

Don Chool Lee; Ronald D. Barro

2014-09-01T23:59:59.000Z

53

Vehicle Technologies Office: 2012 Propulsion Materials R&D Annual...  

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

Propulsion Materials R&D Annual Progress Report Vehicle Technologies Office: 2013 Propulsion Materials R&D Annual Progress Report Low-Cost Direct Bonded Aluminum (DBA) Substrates...

54

Enabling Green Energy and Propulsion Systems via Direct Noise...  

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

GE propulsion systems Enabling Green Energy and Propulsion Systems via Direct Noise Computation PI Name: Umesh Paliath PI Email: paliath@ge.com Institution: GE Global Research...

55

DOE Scientist Earns Chairman's Award from Propulsion and Power...  

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

Scientist Earns Chairman's Award from Propulsion and Power Systems Alliance DOE Scientist Earns Chairman's Award from Propulsion and Power Systems Alliance October 2, 2009 - 1:00pm...

56

Feasibility of MHD submarine propulsion  

SciTech Connect (OSTI)

This report describes the work performed during Phase 1 and Phase 2 of the collaborative research program established between Argonne National Laboratory (ANL) and Newport News Shipbuilding and Dry Dock Company (NNS). Phase I of the program focused on the development of computer models for Magnetohydrodynamic (MHD) propulsion. Phase 2 focused on the experimental validation of the thruster performance models and the identification, through testing, of any phenomena which may impact the attractiveness of this propulsion system for shipboard applications. The report discusses in detail the work performed in Phase 2 of the program. In Phase 2, a two Tesla test facility was designed, built, and operated. The facility test loop, its components, and their design are presented. The test matrix and its rationale are discussed. Representative experimental results of the test program are presented, and are compared to computer model predictions. In general, the results of the tests and their comparison with the predictions indicate that thephenomena affecting the performance of MHD seawater thrusters are well understood and can be accurately predicted with the developed thruster computer models.

Doss, E.D. (ed.) (Argonne National Lab., IL (United States)); Sikes, W.C. (ed.) (Newport News Shipbuilding and Dry Dock Co., VA (United States))

1992-09-01T23:59:59.000Z

57

Solar thermal propulsion status and future  

SciTech Connect (OSTI)

The status of solar absorber/thruster research is reviewed, and potential future applications and advanced solar thermal propulsion concepts are discussed. Emphasis is placed on two concepts, the windowless heat exchanger cavity and the porous material absorption concepts. Mission studies demonstrate greater than 50 percent increase in payload compared to chemical propulsion for a LEO-to-GEO mission. Alternative missions that have been considered for this concept include the Thousand Astronomical Unit mission, LEO-to-lunar orbit, and other SEI missions. It is pointed out that solar thermal propulsion is inherently simple and capable of moderate-to-high engine performance at moderate-to-low thrust levels. 15 refs.

Shoji, J.M.; Frye, P.E.; Mcclanahan, J.A. (Rockwell International Corp., Rocketdyne Div., Canoga Park, CA (United States))

1992-03-01T23:59:59.000Z

58

Integration of Electric Propulsion Systems with Spacecraft An Overview  

E-Print Network [OSTI]

electric propulsion systems are currently being developed ­ ranging from high-power (i.e., >10 kW) systems-propulsion systems to be used on small satellites? In the context of direct-drive electric propulsion? 1 Research1 Integration of Electric Propulsion Systems with Spacecraft ­ An Overview Thomas M. Liu1

Walker, Mitchell

59

Development of a Plasma Probe Positioner Positioner for Propulsion Research  

E-Print Network [OSTI]

(real-time, no delay) electric motor that divides a full rotation into a large number of steps1. #12 Advisor: Dr. Edgar Choueiri Mentor: Luke Uribarri #12;PPDyL 2 Outline Spacecraft Propulsion Electric vs. Chemical Propulsion How Electric Propulsion uses Plasma Problem with Electric Propulsion : Onset Solution

Petta, Jason

60

Marine Nuclear Propulsion for the United Kingdom  

Science Journals Connector (OSTI)

... the Government in an adjournment debate in the House of Commons on March 21 on marine nuclear ... nuclear propulsion, the Joint Parliamentary Secretary to the Ministry of Transport, Mr. John Hay, said ...

1960-04-09T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Photo of the Week: Not Your Typical Jet Engine | Department of Energy  

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

Not Your Typical Jet Engine Not Your Typical Jet Engine Photo of the Week: Not Your Typical Jet Engine November 23, 2012 - 11:57am Addthis As part of the Aircraft Nuclear Propulsion Program, the U.S. conducted extensive research showing that nuclear fission could power an aircraft. The research involved a series of Heat Transfer Reactor Experiments (HTREs), which tested if different types of jet engines could be run by nuclear power. In 1955, however, the project was cancelled, and a safe, operational prototype aircraft was never developed. In this 1988 photo, the two HTRE reactors are shown in transport to Idaho National Laboratory's EBR-1 visitor center, where they remain today. | Photo courtesy of Idaho National Laboratory. As part of the Aircraft Nuclear Propulsion Program, the U.S. conducted

62

Inclusive Jets in PHP  

E-Print Network [OSTI]

Differential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q^2 < 1 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb^-1. Jets were identified in the laboratory frame using the k_T, anti-k_T or SIScone jet algorithms. Cross sections are presented as functions of the jet pseudorapidity, eta(jet), and the jet transverse energy, E_T(jet). Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low E_T(jet) and high eta(jet). The cross sections have the potential to improve the determination of the PDFs in future QCD fits. Values of alpha_s(M_Z) have been extracted from the measurements based on different jet algorithms. In addition, the energy-scale dependence of the strong coupling was determined.

Roloff, Philipp

2013-01-01T23:59:59.000Z

63

Inclusive Jets in PHP  

E-Print Network [OSTI]

Differential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q^2 < 1 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb^-1. Jets were identified in the laboratory frame using the k_T, anti-k_T or SIScone jet algorithms. Cross sections are presented as functions of the jet pseudorapidity, eta(jet), and the jet transverse energy, E_T(jet). Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low E_T(jet) and high eta(jet). The cross sections have the potential to improve the determination of the PDFs in future QCD fits. Values of alpha_s(M_Z) have been extracted from the measurements based on different jet algorithms. In addition, the energy-scale dependence of the strong coupling was determined.

Philipp Roloff

2013-10-23T23:59:59.000Z

64

Nuclear electric propulsion : assessing the design of Project Prometheus.  

E-Print Network [OSTI]

The high fuel efficiency of electric propulsion makes it a viable alternative for long-distance space travel. Project Prometheus was a NASA-led project that sought to demonstrate that distant electric propulsion missions ...

Goycoolea, Martin

2013-01-01T23:59:59.000Z

65

Power balance in a helicon plasma source for space propulsion  

E-Print Network [OSTI]

Electric propulsion systems provide an attractive option for various spacecraft propulsion applications due to their high specific impulse. The power balance of an electric thruster based on a helicon plasma source is ...

White, Daniel B., Jr

2008-01-01T23:59:59.000Z

66

Large eddy simulation modelling of combustion for propulsion applications  

Science Journals Connector (OSTI)

...but also for power generation and for marine applications. The current trend is to...travel are the vehicle design and the propulsion system, and how to integrate them. Two types of propulsion systems, ramjets (Fry 2004) and scramjets...

2009-01-01T23:59:59.000Z

67

H? controller and bumpless transfer design for marine propulsion system  

Science Journals Connector (OSTI)

A method for controller design and switching controller without bump effect has been proposed for a marine propulsion system with diesel engine used as propeller prime-mover. Due to different regimens operation of ship propulsion, it is common practice ... Keywords: H controller, bumpless transfer, ship propulsion system

M. J. Lopez; L. Garcia; J. Lorenzo; A. Consegliere

2009-12-01T23:59:59.000Z

68

GLC Analysis of Organic Chelating Agents in Steam Propulsion Systems  

Science Journals Connector (OSTI)

......Chelating Agents in Steam Propulsion Systems by Paul J. Sniegoski...iminodi- acetic acid) in steam propulsion systems. For chromatogra...as an addi- tive to steam propulsion systems to prevent build-up...Fourth Internaval Conference on Marine Cor- rosion, Naval Research......

Paul J. Sniegoski; David L. Venezky

1974-06-01T23:59:59.000Z

69

Radioisotope electric propulsion (REP): A near-term approach to nuclear propulsion  

Science Journals Connector (OSTI)

Studies over the last decade have shown radioisotope-based nuclear electric propulsion to be enhancing and, in some cases, enabling for many potential robotic science missions. Also known as radioisotope electric propulsion (REP), the technology offers the performance advantages of traditional reactor-powered electric propulsion (i.e., high specific impulse propulsion at large distances from the Sun), but with much smaller, affordable spacecraft. Future use of REP requires development of radioisotope power sources with system specific powers well above that of current systems. The US Department of Energy and NASA have developed an advanced Stirling radioisotope generator (ASRG) engineering unit, which was subjected to rigorous flight qualification-level tests in 2008, and began extended lifetime testing later that year. This advancement, along with recent work on small ion thrusters and life extension technology for Hall thrusters, could enable missions using REP sometime during the next decade.

George R. Schmidt; David H. Manzella; Hani Kamhawi; Tibor Kremic; Steven R. Oleson; John W. Dankanich; Leonard A. Dudzinski

2010-01-01T23:59:59.000Z

70

Fluidic electrodynamics: Approach to electromagnetic propulsion  

SciTech Connect (OSTI)

We report on a new methodological approach to electrodynamics based on a fluidic viewpoint. We develop a systematic approach establishing analogies between physical magnitudes and isomorphism (structure-preserving mappings) between systems of equations. This methodological approach allows us to give a general expression for the hydromotive force, thus re-obtaining the Navier-Stokes equation departing from the appropriate electromotive force. From this ground we offer a fluidic approach to different kinds of issues with interest in propulsion, e.g., the force exerted by a charged particle on a body carrying current; the magnetic force between two parallel currents; the Magnus's force. It is shown how the intermingle between the fluid vector fields and electromagnetic fields leads to new insights on their dynamics. The new concepts introduced in this work suggest possible applications to electromagnetic (EM) propulsion devices and the mastery of the principles of producing electric fields of required configuration in plasma medium.

Martins, Alexandre A.; Pinheiro, Mario J. [Institute for Plasmas and Nuclear Fusion and Instituto Superior Tecnico Lisboa, Portugal 351.1.21.841.92.43 (Portugal); Department of Physics and Institute for Plasmas and Nuclear Fusion and Instituto Superior Tecnico Lisboa, Portugal 351.1.21.841.93.22 (Portugal)

2009-03-16T23:59:59.000Z

71

Interplanetary space transport using inertial fusion propulsion  

SciTech Connect (OSTI)

In this paper, we indicate how the great advantages that ICF offers for interplanetary propulsion can be accomplished with the VISTA spacecraft concept. The performance of VISTA is expected to surpass that from other realistic technologies for Mars missions if the energy gain achievable for ICF targets is above several hundred. Based on the good performance expected from the U. S. National Ignition Facility (NIF), the requirements for VISTA should be well within the realm of possibility if creative target concepts such as the fast ignitor can be developed. We also indicate that a 6000-ton VISTA can visit any planet in the solar system and return to Earth in about 7 years or less without any significant physiological hazards to astronauts. In concept, VISTA provides such short-duration missions, especially to Mars, that the hazards from cosmic radiation and zero gravity can be reduced to insignificant levels. VISTA therefore represents a significant step forward for space-propulsion concepts.

Orth, C.D.

1998-04-20T23:59:59.000Z

72

‘‘Fast Track’’ nuclear thermal propulsion concept  

Science Journals Connector (OSTI)

The objective of the Space Exploration Initiative (‘‘America at the Threshold... ’’ 1991) is the exploration of Mars by man in the second decade of the 21st century. The NASA ‘‘Fast Track’’ approach (NASA?LeRC Presentation 1992) could accelerate the manned exploration of Mars to 2007. NERVA?derived nuclear propulsion represents a viable near?term technology approach to accomplish the accelerated schedule. Key milestones in the progression to the manned Mars mission are (1) demonstration of TRL?6 for the man?rateable system by 1999 (2) a robotic lunar mission by 2000 (3) the first cargo mission to Mars by 2005 and (4) the piloted Mars mission in 2007. The Rocketdyne?Westinghouse concept for nuclear thermal propulsion to achieve these milestones combines the nuclear reactor technology of the Rover/NERVA programs and the state?of?the?art hardware designs from hydrogen?fueled rocket engine successes like the Space Shuttle Main Engine (SSME).

Richard A. Johnson; Herbert R. Zweig; Martin H. Cooper; Jack Wett Jr.

1993-01-01T23:59:59.000Z

73

Fast Track'' nuclear thermal propulsion concept  

SciTech Connect (OSTI)

The objective of the Space Exploration Initiative ( America at the Threshold...,'' 1991) is the exploration of Mars by man in the second decade of the 21st century. The NASA Fast Track'' approach (NASA-LeRC Presentation, 1992) could accelerate the manned exploration of Mars to 2007. NERVA-derived nuclear propulsion represents a viable near-term technology approach to accomplish the accelerated schedule. Key milestones in the progression to the manned Mars mission are (1) demonstration of TRL-6 for the man-rateable system by 1999, (2) a robotic lunar mission by 2000, (3) the first cargo mission to Mars by 2005, and (4) the piloted Mars mission in 2007. The Rocketdyne-Westinghouse concept for nuclear thermal propulsion to achieve these milestones combines the nuclear reactor technology of the Rover/NERVA programs and the state-of-the-art hardware designs from hydrogen-fueled rocket engine successes like the Space Shuttle Main Engine (SSME).

Johnson, R.A.; Zweig, H.R. (Rocketdyne Division, Rockwell International Corporation, 6633 Canoga Avenue, P.O. Box 7922, Canoga Park, California 91309-7922 (United States)); Cooper, M.H.; Wett, J. Jr. (Westinghouse Electric Corporation, Post Office Box 158, Madison, Pennsylvania 15663 (United States))

1993-01-10T23:59:59.000Z

74

Pivotal air induction for marine propulsion device  

SciTech Connect (OSTI)

This patent describes a marine propulsion device comprising a mounting bracket assembly, a propulsion unit including an internal combustion engine and being rotatably connected to the mounting bracket assembly for rotation relative to the mounting bracket assembly about a generally vertical steering axis. A shroud substantially encloses the engine and has therein a combustion air opening centered on the steering axis, and rigid duct means having opposite first and second ends. The first end communicates with the opening and being rotatably connected to the shroud for rotation about the steering axis, and the second end being adapted for connection and for communication through the transom of a boat to enable the engine to draw combustion air from the interior of the boat.

Ferguson, A.R.

1986-11-18T23:59:59.000Z

75

Simplest AB-Thermonuclear Space Propulsion and Electric Generator  

E-Print Network [OSTI]

The author applies, develops and researches mini-sized Micro- AB Thermonuclear Reactors for space propulsion and space power systems. These small engines directly convert the high speed charged particles produced in the thermonuclear reactor into vehicle thrust or vehicle electricity with maximum efficiency. The simplest AB-thermonuclear propulsion offered allows spaceships to reach speeds of 20,000 50,000 km/s (1/6 of light speed) for fuel ratio 0.1 and produces a huge amount of useful electric energy. Offered propulsion system permits flight to any planet of our Solar system in short time and to the nearest non-Sun stars by E-being or intellectual robots during a single human life period. Key words: AB-propulsion, thermonuclear propulsion, space propulsion, thermonuclear power system.

Alexander Bolonkin

2007-01-19T23:59:59.000Z

76

Integrated Mathematical Modeling Software Series of Vehicle Propulsion...  

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

Mathematical Modeling Software Series of Vehicle Propulsion System: (1) Tractive Effort (T sub ew) of Vehicle Road WheelTrack Sprocket Integrated Mathematical Modeling Software...

77

Electric Motors for Vehicle Propulsion; Elektriska motorer för fordonsframdrivning.  

E-Print Network [OSTI]

?? This work is intended to contribute with knowledge to the area of electic motorsfor propulsion in the vehicle industry. This is done by first… (more)

Larsson, Martin

2014-01-01T23:59:59.000Z

78

Advances in Diode Laser Absorption Sensors for Combustion and Propulsion  

Science Journals Connector (OSTI)

Progress is reported in the evolution of diode laser sensors for combustion and propulsion systems. Applications are diverse, ranging from IC engines and gas turbine combustors to...

Hanson, Ronald K

79

Optimal trajectories with solar electric propulsion and gravity assisted maneuver.  

E-Print Network [OSTI]

??The future interplanetary missions will probably use the conventional chemical rockets to leave the sphere of influence of the Earth, and solar electric propulsion (SEP)… (more)

Denilson Paulo Souza dos Santos

2009-01-01T23:59:59.000Z

80

Enabling Green Energy and Propulsion Systems via Direct Noise...  

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

Umesh Paliath, GE Global Research; Joe Insley, Argonne National Laboratory Enabling Green Energy and Propulsion Systems via Direct Noise Computation PI Name: Umesh Paliath PI...

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Large-Eddy Simulation for Green Energy and Propulsion Systems...  

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

Large-Eddy Simulation for Green Energy and Propulsion Systems PI Name: Umesh Paliath PI Email: paliath@ge.com Institution: General Electric Allocation Program: INCITE Allocation...

82

Propulsion Materials R&D | Clean Energy | ORNL  

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

Propulsion Materials Propulsion Materials SHARE Propulsion Materials Improve Powertrains Oak Ridge National Laboratory's transportation research and development in the area of Propulsion Materials is designed to identify and develop advanced materials and processes that improve powertrain system efficiency and reduce emissions. Cutting-edge materials research is crucial to enabling new vehicle technologies that are reliable, fuel efficient, and clean. ORNL researchers, in close collaboration with US industry, are focusing on materials for advanced engines, hybrid and electric drive systems, and vehicle exhaust systems. These materials promote a variety of performance benefits, including lightweighting, higher temperature capabilities, emissions reduction, thermal management, and corrosion mitigation.

83

The Gasdynamic Mirror Fusion Propulsion System -- Revisited  

SciTech Connect (OSTI)

Many of the previous studies assessing the capability of the gasdynamic mirror (GDM) fusion propulsion system employed analyses that ignored the 'ambipolar' potential. This electrostatic potential arises as a result of the rapid escape of the electrons due to their small mass. As they escape, they leave behind an excess positive charge which manifests itself in an electric field that slows down the electrons while speeding up the ions until their respective axial diffusions are equalized. The indirect effect on the ions is that their confinement time is reduced relative to that of zero potential, and hence the plasma length must be increased to accommodate that change. But as they emerge from the thruster mirror - which serves as a magnetic nozzle - the ions acquire an added energy equal to that of the potential energy, and that in turn manifests itself in increased specific impulse and thrust. We assess the propulsive performance of the GDM thruster, based on the more rigorous theory, by applying it to a round trip Mars mission employing a continuous burn acceleration/deceleration type of trajectory. We find that the length of the device and travel time decrease with increasing plasma density, while the total vehicle mass reaches a minimum at a plasma density of 3 x 1016 cm-3. At such a density, and an initial DT ion temperature of 10 keV, a travel time of 60 days is found to be achievable at GDM propulsion parameters of about 200,000 seconds of specific impulse and approximately 47 kN of thrust.

Kammash, Terry [Department of Nuclear Engineering and Radiological Sciences, University of Michigan, 2355 Bonisteel Blvd, Ann Arbor, MI 48109 (United States); Tang, Ricky [Department of Aerospace Engineering, University Michigan, 1320 Beal Ave, Ann Arbor, MI 48109 (United States)

2005-02-06T23:59:59.000Z

84

CMC intake ramp for hypersonic propulsion systems  

SciTech Connect (OSTI)

An alternative technology to produce CMC structural components with lower costs and shorter manufacturing times has been developed at the DLR. The process is based on liquid silicon infiltration (LSI) into porous carbon/carbon resulting in a C/C-SiC material whereby the load carrying fibres are internally protected against oxidation by SiC. The material`s adequate strength levels and the high reproducibility of the state-of-the-art process now allows the realization of CMC components. Representing a very complex structure of high integrity, an intake ramp for a hypersonic propulsion system has been designed, manufactured and tested, which is described in this paper.

Kochendoerfer, R.; Krenkel, W. [Institute of Structures and Design, Stuttgart, (Germany)

1995-12-01T23:59:59.000Z

85

High performance path following for marine vehicles using azimuthing podded propulsion .  

E-Print Network [OSTI]

??Podded propulsion systems offer greater maneuvering possibilities for marine vehicles than conventional shaft and rudder systems. As the propulsion unit rotates about its vertical axis… (more)

Greytak, Matthew B. (Matthew Bardeen)

2006-01-01T23:59:59.000Z

86

E-Print Network 3.0 - accent propulsion lander Sample Search...  

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

vehicle design and operations, propulsion, orbital mechanics, spacecraft... on hypersonic flight and electric rocket propulsion. Dr. Erwin teaches two lower-division...

87

A modelling approach for the overall ship propulsion plant simulation  

Science Journals Connector (OSTI)

In the present paper, a modelling approach for the simulation of the overall ship propulsion plant is presented. A cycle mean value model with differential equations for the calculation of the engine crankshaft and turbocharger shaft speeds is used for ... Keywords: MATLAB Simulink®, marine diesel engine, ship propulsion plant, simulation

G. P. Theotokatos

2007-11-01T23:59:59.000Z

88

CHAPTER 14 - Future of Solid Rocket Propulsion  

Science Journals Connector (OSTI)

Publisher Summary The technological progress of propulsion systems using solid propellants has so far been possible because of the expression of new requirements and the emergence of diversified applications. The search for optimal propellant performance—specific impulse Is and volumetric specific impulse Is ?—continues to be the most important research mission, coupled with other expected technological progress. For composite propellants, revolutionary progress has been achieved only through extensive modifications of the active parts of the manufacturing process. So far, the difficulties facing this development do not involve basic issues such as mechanical components; rather they involve variety of issues ranging from the amount of precision required in the continuous feeding of raw materials and the high level of sensitivity of the propellants to minute variations in the amounts of crosslinking agent or catalyst. The technology of the ramjets and ramrockets is relevent to numerous applications to missiles. The range of systems from several hundred kilometers to several thousand kilometers is a possibility that is being investigated. The development of this type of propulsion is going to take several directions. Beyond applications to high-performance military missiles, the emphasis is placed on costs, particularly for mass industrial productions and very large missiles. This emphasis is not only on the production costs but also on the development costs, implying significant changes in the methods of development.

ALAIN DAVENAS

1993-01-01T23:59:59.000Z

89

Recent advances in nuclear powered electric propulsion for space exploration  

Science Journals Connector (OSTI)

Nuclear and radioisotope powered electric thrusters are being developed as primary in space propulsion systems for potential future robotic and piloted space missions. Possible applications for high-power nuclear electric propulsion include orbit raising and maneuvering of large space platforms, lunar and Mars cargo transport, asteroid rendezvous and sample return, and robotic and piloted planetary missions, while lower power radioisotope electric propulsion could significantly enhance or enable some future robotic deep space science missions. This paper provides an overview of recent US high-power electric thruster research programs, describing the operating principles, challenges, and status of each technology. Mission analysis is presented that compares the benefits and performance of each thruster type for high priority NASA missions. The status of space nuclear power systems for high-power electric propulsion is presented. The paper concludes with a discussion of power and thruster development strategies for future radioisotope electric propulsion systems.

R. Joseph Cassady; Robert H. Frisbee; James H. Gilland; Michael G. Houts; Michael R. LaPointe; Colleen M. Maresse-Reading; Steven R. Oleson; James E. Polk; Derrek Russell; Anita Sengupta

2008-01-01T23:59:59.000Z

90

Radiofrequency in propulsion application to commercial satellites  

SciTech Connect (OSTI)

Application of the RITA ion propulsion system for the Eureca and SAT-2 missions is considered. In the RITA-10 system, xenon is stored at 50-60 bar in a pressure tank, a pressure reduction device reduces the variable high pressure to a constant pressure of 1.5 bar, and a single unit controls the mass flow independently for both the thruster and the neutralizer. The present thruster does not employ isolators between the discharge chamber and the structure, and it achieves thrust level variation by variation of the RF power at constant exhaust velocity. The RF ionizaton system does not require constant generation of electrons during discharge operation. For SAT-2, the requirements are for a thrust level of 15 mN + or - 5 percent and a lifetime of 7000 hours per thruster.

Bassner, H.F.; Berg, H.P.; Kukies, R.

1989-01-01T23:59:59.000Z

91

Propulsion airframe aeroacoustics practices at Honeywell  

Science Journals Connector (OSTI)

Honeywell has been developing and applying acoustic models of propulsion airframe aeroacoustic phenomena for over 20 years. The initial application of a wing?shielding model was developed for the NASA General Aviation Synthesis Program in 1982. Since that time more sophisticated models of wing shielding and reflection have been developed with internal and NASA funding. Recent work has involved models of wing shielding for aft mounted engines and wing reflection for wing mounted engines. These methods are described in the presentation. Comparisons with the Raynoise Code by LMS and measured aircraft fly over noise data are made to show the effectiveness of the model. The attenuation of the inlet noise by the wing of an aft mounted engine and the amplification of the noise by wing mounted engines are evaluated.

2004-01-01T23:59:59.000Z

92

2007 Propulsion Materials Annual Progress Report  

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

Vehicle t echnologies Progra M Less dependence on foreign oil today, and transition to a petroleum-free, emissions-free vehicle tomorrow. 2 0 0 7 a n n u a l p r o g r e s s r e p o r t U.S. Department of Energy Office of Vehicle Technologies 1000 Independence Avenue S.W. Washington, DC 20585-0121 FY 2007 Progress Report for Propulsion Materials Energy Efficiency and Renewable Energy Office of Vehicle Technologies Advanced Materials Technologies Edward J. Wall Program Manager, OVT Rogelio A. Sullivan Advanced Materials Technologies Team Leader Jerry L. Gibbs Technology Manager January 2008 CONTENTS INTRODUCTION..................................................................................................................................... 1 PROJECT 18518 - MATERIALS FOR HIGH EFFICIENCY ENGINES......................................... 9

93

J_{E_T}: A Global Jet Finding Algorithm  

E-Print Network [OSTI]

We introduce a new jet-finding algorithm for a hadron collider based on maximizing a J_{E_T} function for all possible combinations of particles in an event. This function prefers a larger value of the jet transverse energy and a smaller value of the jet mass. The jet shape is proved to be a circular cone in Cartesian coordinates with the geometric center shifted from the jet momentum toward the central region. The jet cone size shrinks for a more forward jet. We have implemented our J_{E_T} algorithm with a reasonable running time scaling as N n^3, where "N" is the total number of particles and "n" (much less than N) is the number of particles in a fiducial region. Many features of our J_{E_T} jets are similar to anti-k_t jets, including the reconstructed jet momentum and the "back-reaction" from soft contamination. Nevertheless, when the jet parameters in the two algorithms are matched using QCD jets, we find that the J_{E_T} algorithm has a larger efficiency than anti-k_t for identifying objects with hard splittings such as a W-jet.

Yang Bai; Zhenyu Han; Ran Lu

2014-11-13T23:59:59.000Z

94

Heatpipe space power and propulsion systems  

SciTech Connect (OSTI)

Safe, reliable, low-mass space power and propulsion systems could have numerous civilian and military applications. This paper discusses two fission-powered concepts: the Heatpipe Power System (HPS) that provides power only, and the Heatpipe Bimodal System (HBS) that provides both power and thermal propulsion. Both concepts have 10 important features. First, only existing technology and recently tested fuel forms are used. Second, fuel can be removed whenever desired, greatly facilitating system fabrication and handling. Third, full electrically heated system testing is possible, with minimal operations required to replace the heaters with fuel and ready the system for launch. Fourth, the systems are passively subcritical during launch accidents. Fifth, a modular approach is used, and most technical issues can be resolved with inexpensive module tests. Sixth, bonds between dissimilar metals are minimized. Seventh, there are no single point failures during power mode operation. Eighth, fuel burnup rate is quite low to help ensure greater than 10-year system life. Ninth, there are no pumped coolant loops, and the systems can be shut down and restarted without coolant freeze/thaw concerns. Finally, a full ground nuclear test is not needed, and development costs will be low. The baseline HPS uses SNAP-10A-style thermoelectric power converters to produce 5 kWe at a system mass of about 500 kg. The unicouple thermoelectric converters have a hot shoe temperature of 1275 K and reject waste heat at 775 K. This type of thermoelectric converter has been used extensively by the space program, demonstrating an operational lifetime of decades. At higher thermal power, the same core can produce over 10 kWe using thermoelectric converters, and over 50 kWe using advanced power conversion systems.

Houts, M.G.; Poston, D.I.; Ranken, W.A.

1995-07-01T23:59:59.000Z

95

Jets from accretion discs  

Science Journals Connector (OSTI)

...been implicated in jet collimation. A particularly instruc...prototypical disc/jet system HH 30 (Burrows et al...some form of intrinsic collimation, since external density...of intrinsic magnetic collimation. There now exist measurements...from the most embedded systems, the class zero objects...

2000-01-01T23:59:59.000Z

96

Torque-Power-Speed Hybrid Control of Marine Electric Propulsion System  

Science Journals Connector (OSTI)

The conventional electric propulsion system is usually aimed at controlling the shaft speed only, without taking advantages of the electric propulsion motor into control strategies. This paper designs a SSP for marine electric propulsion system with ... Keywords: control, ship, marine electric propulsion, hybrid control

Guichen Zhang; Jie Ma

2010-05-01T23:59:59.000Z

97

WORKSHOP REPORT:Light-Duty Vehicles Technical Requirements and Gaps for Lightweight and Propulsion Materials  

Broader source: Energy.gov [DOE]

WORKSHOP REPORT:Light-Duty Vehicles Technical Requirements and Gaps for Lightweight and Propulsion Materials

98

DOE Scientist Earns Chairman's Award from Propulsion and Power Systems  

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

Scientist Earns Chairman's Award from Propulsion and Power Scientist Earns Chairman's Award from Propulsion and Power Systems Alliance DOE Scientist Earns Chairman's Award from Propulsion and Power Systems Alliance October 2, 2009 - 1:00pm Addthis Washington, DC - A researcher at the Office of Fossil Energy's National Energy Technology Laboratory (NETL) has been presented with the Chairman's Award by the Propulsion and Power Systems Alliance (PPSA). Mary Anne Alvin, a physical scientist in NETL's Office of Research and Development, was recognized for her lead role in revitalizing the PPSA Materials Technical Area Team. This prestigious award is only given during a year when outstanding service is observed. The PPSA was formed in 1999 with the mission of improving coordination and collaboration among government agencies to better leverage existing federal

99

Design of repeating projectile toy based on bistable spring propulsion  

E-Print Network [OSTI]

Recently, bistable springs have been proven as a viable propulsion method for the standard 1.75" foam balls used in Nerf® projectile toys. This technology was developed at M.I.T. by William Fienup and Barry Kudrowitz, who ...

Blanco, Matthew C. (Matthew Corwin)

2007-01-01T23:59:59.000Z

100

Solar Sail Propulsion: An Enabling Technology for Fundamental Physics Missions  

Science Journals Connector (OSTI)

Solar sails enable a wide range of high- ... system. They are also an enabling propulsion technology for two types of deep-space missions ... and the large-scale gravitational field of the solar system: the first...

Bernd Dachwald; Wolfgang Seboldt; Claus Lammerzahl

2008-01-01T23:59:59.000Z

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


101

Propulsion devices for locomotion at low-Reynolds number  

E-Print Network [OSTI]

We have designed, built, and tested three novel devices that use low-Reynolds number flows for self propulsion. The three-link swimmer is designed to swim through in a free viscous fluid using cyclic flipping motion of two ...

Chan, Brian, 1980-

2004-01-01T23:59:59.000Z

102

Diesel-electric marine propulsion grows in popularity  

SciTech Connect (OSTI)

A recent conference on electric ship propulsion held in London highlighted the big strides made in this field in the last few years. What has given the technology a tremendous fillip in recent years is the new generation of ac/ac electrical drives resulting from the development of reliable high-power semiconductor devices and their associated control systems. Diesel-electric propulsion systems provide flexibility both for the operation of the vessel and in the layout of the main components - gen-sets, converters, switchgear and propulsion motors, for example. Furthermore, the system enables the `power station` philosophy to be applied, with propulsion and all ship`s services being supplied from one power source. This paper discusses the main diesel electric systems available today.

Mullins, P.

1996-03-01T23:59:59.000Z

103

A Policy for Nuclear-Powered Marine Propulsion  

Science Journals Connector (OSTI)

... DISCUSSING the technical situation in its report, Nuclear Power for Ship Propulsion *, the Padmore Working Group on ... *, the Padmore Working Group on Marine Reactor Research points out that the U.S. Administration has already built an experimental ...

1964-06-27T23:59:59.000Z

104

Performance of a boundary layer ingesting propulsion system  

E-Print Network [OSTI]

This thesis presents an assessment of the aerodynamic performance of an aircraft propulsion system, with embedded engines, in the presence of aircraft fuselage boundary layer ingestion (BLI). The emphasis is on defining ...

Plas, Angélique (Angélique Pascale)

2006-01-01T23:59:59.000Z

105

Porous material and process development for electrospray propulsion applications  

E-Print Network [OSTI]

Ion electrospray propulsion devices rely on the transportation of ionic liquid propellant to emission regions where ions are extracted at high velocities. One such method involves the use of porous substrates to passively ...

Arestie, Steven Mark

2014-01-01T23:59:59.000Z

106

Application of ion electrospray propulsion to lunar and interplanetary missions  

E-Print Network [OSTI]

High specific impulse electric propulsion systems enable ambitious lunar and interplanetary missions that return a wealth of scientific data. Many of these technologies are difficult to scale down, meaning the spacecraft ...

Whitlock, Caleb W. (Caleb Wade)

2014-01-01T23:59:59.000Z

107

A doubly-fed machine for propulsion applications  

E-Print Network [OSTI]

A doubly fed machine for propulsion applications is proposed, which, given the presence of AC and DC power sources, can be utilized in order to improve efficiency, weight, volume, and sizing of the rotor power electronics. ...

Tomovich, Michael S. (Michael Stephen)

2014-01-01T23:59:59.000Z

108

Assessment of propfan propulsion systems for reduced environmental impact  

E-Print Network [OSTI]

Current aircraft engine designs tend towards higher bypass ratio, low-speed fan designs for improved fuel burn, reduced emissions and noise. Alternative propulsion concepts include counter-rotating propfans (CRPs) which ...

Peters, Andreas, Ph. D. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

109

Design tool needs for space nuclear propulsion systems  

SciTech Connect (OSTI)

The interest in a return trip for humans to the moon and a pioneering voyage to Mars has rekindled interest in the use of nuclear reactors to provide propulsion for both piloted and robotic space vehicles. Two types of nuclear reactor-based propulsion systems are currently envisioned: nuclear thermal propulsion (NTP) and nuclear electric propulsion (NEP). The former relies on the direct heating and exhaust of a propellant within the core of the reactor, while the latter utilizes ion thruster engines for propulsion, and the nuclear reactor supplies the large amount of electrical power required to drive the engines. Another direct contrast between the NTP and NEP concepts is the length of reactor operation. The NTP nuclear rocket core is required to produce large amounts of thermal power for relatively short bursts (on the order of minutes to hours), and the NEP reactor core operates for a much longer period of time (on the order of days to months) with a steady-state electrical power output. The design of these types of nuclear reactor systems requires the use of specific analysis tools, some of which already exist and others that need considerable development. The general areas in which design tools are needed in the development of systems for space nuclear propulsion include the following: (1) neutronics design - both steady-state and transient applications including thermal feedback effects; (2) thermal-hydraulics design - again, both steady-state and transient applications with coupling to and from the neutronics design codes; (3) materials analysis tools - due to the high temperatures and high stresses required for efficient propulsion operation, increased importance will be placed on understanding the material responses; and (4) systems analysis - these codes allow optimizaiton of the entire propulsion system.

Klein, A.C. (Oregon State Univ., Corvallis (United States)); Lewis, B.R. (Atom Analysis, Inc., Portland, OR (United States))

1992-01-01T23:59:59.000Z

110

Angular Scaling In Jets  

SciTech Connect (OSTI)

We introduce a jet shape observable defined for an ensemble of jets in terms of two-particle angular correlations and a resolution parameter R. This quantity is infrared and collinear safe and can be interpreted as a scaling exponent for the angular distribution of mass inside the jet. For small R it is close to the value 2 as a consequence of the approximately scale invariant QCD dynamics. For large R it is sensitive to non-perturbative effects. We describe the use of this correlation function for tests of QCD, for studying underlying event and pile-up effects, and for tuning Monte Carlo event generators.

Jankowiak, Martin; Larkoski, Andrew J.; /SLAC

2012-02-17T23:59:59.000Z

111

2002 JET PROPULSION A N N U A L . R E P O R T  

E-Print Network [OSTI]

landing parachute. #12;MESSAGE DIRECTOR'S If the history of JPL were a book, we are on the verge and yet an- other flew by an asteroid on its way to a comet. A new ocean satellite began science

Waliser, Duane E.

112

Jet Propulsion Laboratory 1974-1975 Annual Report Cover The Manner 10 commemoratMl  

E-Print Network [OSTI]

. The hydrogen injection engine project entered the vehicle system design phase. A study on alternative would enable this eHort to interface with the Mariner Jupiter/Saturn 1977 Project at minimum cost of a national geothermal energy program and development of low-cost silicon arrays in an eHort to improve

Waliser, Duane E.

113

JET PROPULSION LABORATORY 1987 ANNUAL REPORT (Cover) At the heart of the  

E-Print Network [OSTI]

-sufficient in energy, JPL responded with research and develop- ment in solar photovoltaics, solar thermal energy, and integrity as guiding principles; (2) as NASA's lead center for unmanned exploration of the solar system, JPL- ally funded research and development center, JPL helps the United States solve technologi- cal problems

Waliser, Duane E.

114

Electric propulsion motor for marine vehicles  

SciTech Connect (OSTI)

An electric propulsion motor for marine vehicles is described comprising: a disk-shaped rotor and two coaxial disk-shaped stators, the rotor being separated from each of the stators in an axial direction by an air gap; the rotor including a plurality of permanent magnets that produce a first magnetic field; each stator comprising an armature winding that is connected to a source of electrical current to produce a second magnetic field, the first and second magnetic fields being capable of interacting to create an electromagnetic torque; means for coupling the rotor to a propeller shaft for transferring the torque from the rotor to the shaft, and means for detecting the angle of the shaft; a current control means for receiving a current control signal and for employing pulse width modulation to control the source of electrical current; the current control means including means for storing compensation information related to torque variations that are a function of shaft angle; the current control means further including means connected and responsive to the shaft angle detecting means for selecting the compensation information as a function of shaft angle and means for combining the compensation information with the current control signal to control the source of electrical current such that the torque variations that are a function of shaft angle are minimized; and wherein the means for coupling the rotor to the propeller shaft includes means within the motor for isolating the shaft from sound produced by the motor.

Dade, T.B.; Leiding, K.W.; Mongeau, P.P.; Piercey, M.S.

1993-07-20T23:59:59.000Z

115

Jet and Photon Physics  

E-Print Network [OSTI]

Jet production in proton-proton collisions is one of the main phenomenological predictions of QCD. The ATLAS and CMS Collaborations have performed measurements of several jet observables at the LHC and compared their results to theoretical predictions and event generators. Useful physics input for the determination of the parton distribution functions and the strong coupling constant is provided. Photon production measurements represent another important test of QCD and show strong sensitivity to higher-order corrections.

Peruzzi, Marco

2014-01-01T23:59:59.000Z

116

Jet and photon physics  

E-Print Network [OSTI]

Jet production in proton-proton collisions is one of the main phenomenological predictions of QCD. The ATLAS and CMS Collaborations have performed measurements of several jet observables at the LHC and compared their results to theoretical predictions and event generators. Useful physics input for the determination of the parton distribution functions and the strong coupling constant is provided. Photon production measurements represent another important test of QCD and show strong sensitivity to higher-order corrections.

Marco Peruzzi; for the ATLAS; CMS Collaborations

2014-09-30T23:59:59.000Z

117

Feasibility of MHD submarine propulsion. Phase II, MHD propulsion: Testing in a two Tesla test facility  

SciTech Connect (OSTI)

This report describes the work performed during Phase 1 and Phase 2 of the collaborative research program established between Argonne National Laboratory (ANL) and Newport News Shipbuilding and Dry Dock Company (NNS). Phase I of the program focused on the development of computer models for Magnetohydrodynamic (MHD) propulsion. Phase 2 focused on the experimental validation of the thruster performance models and the identification, through testing, of any phenomena which may impact the attractiveness of this propulsion system for shipboard applications. The report discusses in detail the work performed in Phase 2 of the program. In Phase 2, a two Tesla test facility was designed, built, and operated. The facility test loop, its components, and their design are presented. The test matrix and its rationale are discussed. Representative experimental results of the test program are presented, and are compared to computer model predictions. In general, the results of the tests and their comparison with the predictions indicate that thephenomena affecting the performance of MHD seawater thrusters are well understood and can be accurately predicted with the developed thruster computer models.

Doss, E.D. [ed.] [Argonne National Lab., IL (United States); Sikes, W.C. [ed.] [Newport News Shipbuilding and Dry Dock Co., VA (United States)

1992-09-01T23:59:59.000Z

118

Numerical Investigation of Laser Propulsion for Transport in Water Environment  

SciTech Connect (OSTI)

Problems that cumber the development of the laser propulsion in atmosphere and vacuum are discussed. Based on the theory of interaction between high-intensity laser and materials, as air and water, it is proved that transport in water environment can be impulsed by laser. The process of laser propulsion in water is investigated theoretically and numerically. It shows that not only the laser induced plasma shock wave, but also the laser induced bubble oscillation shock waves and the pressure induced by the collapsing bubble can be used. Many experimental results show that the theory and the numerical results are valid. The numerical result of the contribution of every propulsion source is given in percentage. And the maximum momentum coupling coefficient Cm is given. Laser propulsion in water environment can be applied in many fields. For example, it can provide highly controllable forces of the order of micro-Newton ({mu}N) in microsystems, such as the MEMS (Micro-electromechanical Systems). It can be used as minimally invasive surgery tools of high temporal and spatial resolution. It can be used as the propulsion source in marine survey and exploitation.

Han Bing; Li Beibei; Zhang Hongchao; Chen Jun; Shen Zhonghua; Lu Jian; Ni Xiaowu [Department of Science, Nanjing University of Science and Technology, Nanjing 210094 (China)

2010-10-08T23:59:59.000Z

119

Top Jets at the LHC  

E-Print Network [OSTI]

Physics Signatures at the LHC,” talk presented at the 2007Top Jets at the LHC Leandro G. Almeida, Seung J. Lee, GiladSEPT-DPP Top Jets at the LHC Leandro G. Almeida a , Seung J.

Almeida, L.G.

2009-01-01T23:59:59.000Z

120

FY2001 Progress Report for Automotive Propulsion Materials  

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

AUTOMOTIVE PROPULSION AUTOMOTIVE PROPULSION MATERIALS 2 0 0 1 A N N U A L P R O G R E S S R E P O R T U.S. Department of Energy Energy Efficiency and Renewable Energy Office of Transportation Technologies A C K N O W L E D G E M E N T We would like to express our sincere appreciation to Argonne National Laboratory, Computer Systems Management, Inc., and Oak Ridge National Laboratory, for their artistic and technical contributions in preparing and publishing this report. In addition, we would like to thank all our program participants for their contributions to the programs and all the authors who prepared the project abstracts that comprise this report. U.S. Department of Energy Office of Advanced Automotive Technologies 1000 Independence Avenue S.W. Washington, DC 20585-0121 FY 2001 Progress Report for Propulsion Materials

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


121

Self-propulsion of V-shape micro-robot  

E-Print Network [OSTI]

In this paper we study the self-propulsion of a symmetric V-shape micro-robot (or V-robot) which consists of three spheres connected by two arms with an angle between them; the arms' lengths and the angle are changing periodically. Using an asymptotic procedure containing two-timing method and a distinguished limit, we obtain analytic expressions for the self-propulsion velocity and Lighthill's efficiency. The calculations show that a version of V-robot, aligned perpendicularly to the direction of self-swimming, is both the fastest one and the most efficient one. We have also shown that such $V$-robot is faster and more efficient than a linear three-sphere micro-robot. At the same time the maximal self-propulsion velocity of V-robots is significantly smaller than that of comparable microorganisms.

Vladimir A. Vladimirov

2012-09-13T23:59:59.000Z

122

Australian Science and Technology with Relevance to Beamed Energy Propulsion  

SciTech Connect (OSTI)

Although Australia has no Beamed Energy Propulsion programs at the present time, it is accomplishing significant scientific and technological activity that is of potential relevance to Beamed Energy Propulsion (BEP). These activities include: continual upgrading and enhancement of the Woomera Test Facility, Which is ideal for development and test of high power laser or microwave systems and the flight vehicles they would propel; collaborative development and test, with the US and UK of hypersonic missiles that embody many features needed by beam-propelled flight vehicles; hypersonic air breathing propulsion systems that embody inlet-engine-nozzle features needed for beam-riding agility by air breathing craft; and research on specially conditioned EM fields that could reduce beamed energy lost during atmospheric propagation.

Froning, H. David Jr [PO Box 180, Gumeracha SA 5233 (Australia)

2008-04-28T23:59:59.000Z

123

Photon Tools for Fuel Spray Studies in Aerospace Propulsion Systems  

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

Tools for Fuel Spray Studies in Aerospace Tools for Fuel Spray Studies in Aerospace Propulsion Systems Kuo-Cheng Lin, 1 Campbell D. Carter, 2 and Stephen A. Schumaker 3 1 Taitech, Inc., 1430 Oak Court, Suite 301, Beavercreek, OH 45430, USA; 2 Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 45433, USA; 3 Air Force Research Laboratory, Edwards Air Force Base, CA 93524, USA Fuel injection plays an important role in establishing stable and efficient combustion inside the combustor of a liquid-fueled aerospace propulsion system. Depending on the application of interest, fuel injection conditions range from high-speed crossflows in the air-breathing propulsion systems to quiescent environments with extremely high pressures in the rocket engines. In addition to the typical liquid

124

Multiple jet interactions  

E-Print Network [OSTI]

Type Designation Key Direction of Traverse: A - Axial R ? Radial A CON1 N (1) (3) (2) (2) Probe Type: N - Straight, a=O' S - Slant, a=45' (3) Configuration: CON1 CON2 CON3 CON4 CONS CON6 Jets h/D X/h 8 5. 0 16 2. 5 5. 33 7. 5 8 5. 0..., h/D=8. 0 and 2 Jets, h/D=8. 0. 0. 30 SYM INFORMATION: 8 RUN 24 RCON4N X/0 40 0. 25 oo 0. 20 0. 10 0. 05 0. 00 -0 4 -0 3 -0 2 -0. 1 0 0 0. 1 0 2 0 3 0 4 TyX Fig. 24 Distribution of Turbulence Intensity for 2 Jets, b/D=16. 0. 0. 30 BYN...

Hehr, Roger James

2012-06-07T23:59:59.000Z

125

Organic vapor jet printing system  

SciTech Connect (OSTI)

An organic vapor jet printing system includes a pump for increasing the pressure of an organic flux.

Forrest, Stephen R

2012-10-23T23:59:59.000Z

126

High performance path following for marine vehicles using azimuthing podded propulsion  

E-Print Network [OSTI]

Podded propulsion systems offer greater maneuvering possibilities for marine vehicles than conventional shaft and rudder systems. As the propulsion unit rotates about its vertical axis to a specified azimuth angle, the ...

Greytak, Matthew B. (Matthew Bardeen)

2006-01-01T23:59:59.000Z

127

JOURNAL OF PROPULSION AND POWER Vol. 20, No. 5, SeptemberOctober 2004  

E-Print Network [OSTI]

turbines used in power plants and aircraft and marine propulsion. Another im- portant applicationJOURNAL OF PROPULSION AND POWER Vol. 20, No. 5, September­October 2004 Modeling of Surge in Free

Gravdahl, Jan Tommy

128

FY2003 Progress Report for Automotive Propulsion Materials Program  

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

FreedomCAR and Vehicle Technologies FreedomCAR and Vehicle Technologies 1000 Independence Avenue S.W. Washington, DC 20585-0121 FY 2003 Progress Report for Automotive Propulsion Materials Program Energy Efficiency and Renewable Energy Office of FreedomCAR and Vehicle Technologies Edward Wall Program Manager December 2003 U.S. Department of Energy Office of FreedomCAR and Vehicle Technologies 1000 Independence Avenue S.W. Washington, DC 20585-0121 FY 2003 Progress Report for Automotive Propulsion Materials Program Energy Efficiency and Renewable Energy Office of FreedomCAR and Vehicle Technologies Edward Wall Program Manager December 2003 CONTENTS 1. INTRODUCTION ........................................................................................................... 1

129

Life cycle considerations in propulsion alternatives for fast vessels  

SciTech Connect (OSTI)

Fast vessels are being built and operated for a large range of passenger-carrying applications. Fast cargo-carrying vessels are being considered in a variety of sizes as well. A major decision in design and construction of these vessels is the propulsion system; this decision has major impacts on the operation economics as well as the operational capabilities of the vessels. Factors involved in consideration of propulsion alternatives for fast vessels are examined, with emphasis upon the total life cycle operating implications of these factors. A methodology for considering the factors is suggested, and an example is presented with results of the consideration tradeoffs.

Luck, D.L. [General Electric Co., Evendale, OH (United States). GE Marine and Industrial Engines

1996-07-01T23:59:59.000Z

130

Tutorial on nuclear thermal propulsion safety for Mars  

SciTech Connect (OSTI)

Safety is the prime design requirement for nuclear thermal propulsion (NTP). It must be built in at the initiation of the design process. An understanding of safety concerns is fundamental to the development of nuclear rockets for manned missions to Mars and many other applications that will be enabled or greatly enhanced by the use of nuclear propulsion. To provide an understanding of the basic issues, a tutorial has been prepared. This tutorial covers a range of topics including safety requirements and approaches to meet these requirements, risk and safety analysis methodology, NERVA reliability and safety approach, and life cycle risk assessments.

Buden, D.

1992-01-01T23:59:59.000Z

131

Tutorial on nuclear thermal propulsion safety for Mars  

SciTech Connect (OSTI)

Safety is the prime design requirement for nuclear thermal propulsion (NTP). It must be built in at the initiation of the design process. An understanding of safety concerns is fundamental to the development of nuclear rockets for manned missions to Mars and many other applications that will be enabled or greatly enhanced by the use of nuclear propulsion. To provide an understanding of the basic issues, a tutorial has been prepared. This tutorial covers a range of topics including safety requirements and approaches to meet these requirements, risk and safety analysis methodology, NERVA reliability and safety approach, and life cycle risk assessments.

Buden, D.

1992-08-01T23:59:59.000Z

132

E-Print Network 3.0 - ab-thermonuclear space propulsion Sample...  

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

thermonuclear space propulsion Search Powered by Explorit Topic List Advanced Search Sample search results for: ab-thermonuclear...

133

Effect of chordwise flexibility and depth of submergence on an oscillating plate underwater propulsion system  

E-Print Network [OSTI]

by fish and some other marine animals. The primary attention was the propulsive characteristics propulsion system by Oleksandr Barannyk B.Sc. in Mathematics and Computer Sciences, Poltava State University underwater propulsion system by Oleksandr Barannyk B.Sc. in Mathematics and Computer Sciences, Poltava State

Victoria, University of

134

A Novel Simulation System for Marine Main Diesel Propulsion Remote Control  

Science Journals Connector (OSTI)

The purpose of the paper is to develop a novel simulation system for ship propulsion plant. The nonlinear mathematical model of main propulsion system of a large container ship is established, consisting of the large low speed two-stroke diesel engine, ... Keywords: simulation system, large-scale low-speed two-stroke diesel engine, marine main diesel propulsion

Yang Yang; Chen Guo; Jian-bo Sun; De-wen Yan

2011-11-01T23:59:59.000Z

135

Gasoline Jet Fuels  

E-Print Network [OSTI]

C4n= Diesel Gasoline Jet Fuels C O C5: Xylose C6 Fermentation of sugars Biofuel "Nanobowls" are inorganic catalysts that could provide the selectivity for converting sugars to fuels IACT Proposes Synthetic, Inorganic Catalysts to Produce Biofuels Current Process

Kemner, Ken

136

Jets from accretion discs  

Science Journals Connector (OSTI)

...associ- ation with relativistic processes and accretion discs in the...laboratory in which to study these processes on shorter time-scales in...astrophysics. Proc. 12th Kingston Mtg (ed. D. A. Clarke & M...astrophysical jets. II. Dynamical processes in the accretion of magnetized...

2000-01-01T23:59:59.000Z

137

Downhole jet pump  

SciTech Connect (OSTI)

This patient describes a well equipped to produce oil at the surface from a subterranean formation including: a casing string cemented in a well bore penetrating the earth to a depth below the formation, the casing string comprising perforations extending through the casing string into communication with the formation; a packer sealed against the interior of the casing string above the formation; a tubing string inside the casing string and providing therewith an annulus, the tubing string being connected to the packer and extending upwardly to the surface, the tubing string and annulus providing a first upward path to the surface and a second downward fluid path from the surface; and a jet pump assembly including a jet pump below the packer comprising a body having an upper end, an outlet in communicating with the first fluid path, a nozzle section having a suction inlet below the packer and a power fluid inlet, means providing communication between the second fluid path and the nozzle section for delivering power fluid to the power fluid inlet and means connecting the upper jet pump body end to the tubing string comprising as J-slot receptacle secured to the upper jet pump body end having a J-slot therein, a tubular member connected with and communicating with the tubing string and having a J-slot pin on the lower end thereof removably received in the J-slot and means sealing between the J-slot receptacle and J-slot pin.

Weeks, B.R.

1988-12-13T23:59:59.000Z

138

State of Detonation Stability Theory and Its Application to Propulsion  

E-Print Network [OSTI]

State of Detonation Stability Theory and Its Application to Propulsion D. Scott Stewart University, Massachusetts 02139 DOI: 10.2514/1.21586 We present an overview of the current state of detonation stability or asymptotic treatments of detonations, including various asymptotic limits that appear in the literature

Kasimov, Aslan

139

Maneuverability and smoke emission constraints in marine diesel propulsion  

Science Journals Connector (OSTI)

A multivariable control scheme is designed that reduces smoke generation on an experimental marine diesel engine equipped with a variable geometry turbocharger. The variable geometry turbocharger allows the improvement of the steady-state ship hydrodynamic and propulsion characteristics and requires coordination with the injected mass fuel to achieve a good transient performance.

Anna Stefanopoulou; Roy Smith

2000-01-01T23:59:59.000Z

140

Modified shielding jet model for twin-jet shielding analysis  

E-Print Network [OSTI]

the slowing of the jet flow due to turbulent mixing and entrainment of particles from the surrounding medium. The empirical formulations and velocity profiles derived for the respective regions of the jet consider this increase in entrained fluid... velocity profiles are integrated over their respective cross sections of the shielding jet to determine the total volumetric flowrate at the specified locations. A slug flow velocity approximation is then determined for each of the desired downstream...

Gilbride, Jennifer Frances

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

V+jets production at the CMS  

E-Print Network [OSTI]

Measurements of Vector Boson production in association with jets are presented, using p-p collision data at sqrt{s} = 7 TeV. The measurements presented include Z + jets azimuthal correlations, event shapes, vector boson + jets differential cross section measurements, hard double-parton scattering using W + jets events and electroweak Z + forward - backward jet production.

B. Bilin; for the CMS Collaboration

2014-10-22T23:59:59.000Z

142

BNL experiment with gas jet  

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

project: Study of Hot Electron Transport and Subsequent Ion Acceleration using Overdense Gas Jet Target and Ultrafast TW CO2 Laser System Vitaly Yakimenko, Igor Pogorelsky ATF,...

143

Jet Charge at the LHC  

Science Journals Connector (OSTI)

Knowing the charge of the parton initiating a light-quark jet could be extremely useful both for testing aspects of the standard model and for characterizing potential beyond-the-standard-model signals. We show that despite the complications of hadronization and out-of-jet radiation such as pileup, a weighted sum of the charges of a jet’s constituents can be used at the LHC to distinguish among jets with different charges. Potential applications include measuring electroweak quantum numbers of hadronically decaying resonances or supersymmetric particles, as well as standard model tests, such as jet charge in dijet events or in hadronically decaying W bosons in tt¯ events. We develop a systematically improvable method to calculate moments of these charge distributions by combining multihadron fragmentation functions with perturbative jet functions and pertubative evolution equations. We show that the dependence on energy and jet size for the average and width of the jet charge can be calculated despite the large experimental uncertainty on fragmentation functions. These calculations can provide a validation tool for data independent of Monte Carlo fragmentation models.

David Krohn; Matthew D. Schwartz; Tongyan Lin; Wouter J. Waalewijn

2013-05-21T23:59:59.000Z

144

Plasma jets key to enduring solar mystery  

Science Journals Connector (OSTI)

... a few million degrees? The answer, researchers say, might lie in hot jets of plasma erupting from the Sun's surface. ... erupting from the Sun's surface. Plasma jets have also been considered as a possible heating mechanism. These jets are known ...

Jon Cartwright

2011-01-06T23:59:59.000Z

145

The Dynamics of Baroclinic Zonal Jets  

Science Journals Connector (OSTI)

Multiple alternating zonal jets are a ubiquitous feature of planetary atmospheres and oceans. However, most studies to date have focused on the special case of barotropic jets. Here we investigate the dynamics of freely evolving baroclinic jets, ...

Paul D. Williams; Christopher W. Kelsall

146

Enabling Green Energy and Propulsion Systems via Direct Noise Computation |  

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

High-fidelity simulation of exhaust nozzle under installed configuration High-fidelity simulation of exhaust nozzle under installed configuration Umesh Paliath, GE Global Research; Joe Insley, Argonne National Laboratory Enabling Green Energy and Propulsion Systems via Direct Noise Computation PI Name: Umesh Paliath PI Email: paliath@ge.com Institution: GE Global Research Allocation Program: INCITE Allocation Hours at ALCF: 105 Million Year: 2013 Research Domain: Engineering GE Global Research is using the Argonne Leadership Computing Facility (ALCF) to deliver significant improvements in efficiency, (renewable's) yield and lower emissions (noise) for advanced energy and propulsion systems. Understanding the fundamental physics of turbulent mixing has the potential to transform product design for components such as airfoils and

147

MHK Technologies/Wave Energy Propulsion | Open Energy Information  

Open Energy Info (EERE)

< MHK Technologies < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Wave Energy Propulsion.jpg Technology Profile Primary Organization Kneider Innovations Technology Resource Click here Wave Technology Type Click here Attenuator Technology Description The device concept is a converter of the vertical potential energy moving wave to push the boat on horizontal kinetic motion Optimum Marine/Riverline Conditions The device is compliant for boat navigating on sea and oceans or lakes when water levels are changing cyclicly waves Technology Dimensions Device Testing Date Submitted 18:32.0 << Return to the MHK database homepage Retrieved from "http://en.openei.org/w/index.php?title=MHK_Technologies/Wave_Energy_Propulsion&oldid=681483"

148

Scoping calculations of power sources for nuclear electric propulsion  

SciTech Connect (OSTI)

This technical memorandum describes models and calculational procedures to fully characterize the nuclear island of power sources for nuclear electric propulsion. Two computer codes were written: one for the gas-cooled NERVA derivative reactor and the other for liquid metal-cooled fuel pin reactors. These codes are going to be interfaced by NASA with the balance of plant in order to making scoping calculations for mission analysis.

Difilippo, F.C. [Oak Ridge National Lab., TN (United States)] [Oak Ridge National Lab., TN (United States)

1994-05-01T23:59:59.000Z

149

Performance and Controllability of Pulsed Ion Beam Ablation Propulsion  

SciTech Connect (OSTI)

We propose novel propulsion driven by ablation plasma pressures produced by the irradiation of pulsed ion beams onto a propellant. The ion beam ablation propulsion demonstrates by a thin foil (50 {mu}mt), and the flyer velocity of 7.7 km/s at the ion beam energy density of 2 kJ/cm2 adopted by using the Time-of-flight method is observed numerically and experimentally. We estimate the performance of the ion beam ablation propulsion as specific impulse of 3600 s and impulse bit density of 1700 Ns/m2 obtained from the demonstration results. In the numerical analysis, a one-dimensional hydrodynamic model with ion beam energy depositions is used. The control of the ion beam kinetic energy is only improvement of the performance but also propellant consumption. The spacecraft driven by the ion beam ablation provides high performance efficiency with short-pulsed ion beam irradiation. The numerical results of the advanced model explained latent heat and real gas equation of state agreed well with experimental ones over a wide range of the incident ion beam energy density.

Yazawa, Masaru; Buttapeng, Chainarong; Harada, Nobuhiro [Nagaoka University of Technology, Department of Electrical Engineering, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan); Suematsu, Hisayuki; Jiang Weihua; Yatsui, Kiyoshi [Nagaoka University of Technology, Extreme Energy-Density Research Institute, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan)

2006-05-02T23:59:59.000Z

150

Sustainable Alternative Jet Fuels | Department of Energy  

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

Sustainable Alternative Jet Fuels Sustainable Alternative Jet Fuels Nate Brown, Federal Aviation Administration, presentation at the Industry Roundtable on Update on ASTM Approval....

151

Mercury Jet Studies Tristan Davenne  

E-Print Network [OSTI]

Mercury Jet Studies Tristan Davenne Rutherford Appleton Laboratory Joint UKNF, INO, UKIERI meeting mercury target and reported a radial velocity at surface of mercury jet due to proton beam is 36m/s #12;Numerical simulation of Sievers & Pugnat Result Click on image above to watch video of 2cm mercury target

McDonald, Kirk

152

OPENING ANGLES OF COLLAPSAR JETS  

SciTech Connect (OSTI)

We investigate the jet propagation and breakout from the stellar progenitor for gamma-ray burst (GRB) collapsars by performing two-dimensional relativistic hydrodynamic simulations and analytical modeling. We find that the jet opening angle is given by ?{sub j} ? 1/5?{sub 0} and infer the initial Lorentz factor of the jet at the central engine, ?{sub 0}, is a few for existing observations of ?{sub j}. The jet keeps the Lorentz factor low inside the star by converging cylindrically via collimation shocks under the cocoon pressure and accelerates at jet breakout before the free expansion to a hollow-cone structure. In this new picture, the GRB duration is determined by the sound crossing time of the cocoon, after which the opening angle widens, reducing the apparent luminosity. Some bursts violating the maximum opening angle ?{sub j,{sub max}} ? 1/5 ? 12° imply the existence of a baryon-rich sheath or a long-acting jet. We can explain the slopes in both Amati and Yonetoku spectral relations using an off-centered photosphere model, if we make only one assumption that the total jet luminosity is proportional to the initial Lorentz factor of the jet. We also numerically calibrate the pre-breakout model (Bromberg et al.) for later use.

Mizuta, Akira; Ioka, Kunihito [Theory Center, Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801 (Japan)

2013-11-10T23:59:59.000Z

153

Integrated null-flux suspension and multiphase propulsion system for magnetically-levitated vehicles  

DOE Patents [OSTI]

This report discusses a propulsion and stabilization system comprising a series of figure 8 coils mounted vertically on the walls of the guideway to provide suspension, lateral guidance and propulsion of a magnetically levitated vehicle. This system further allows for altering the magnetic field effects by changing the relative position of the loops comprising the figure 8 coils either longitudinally and/or vertically with resulting changes in the propulsion, the vertical stability, and the suspension.

Rote, D.M.; He, Jianliang; Johnson, L.R.

1992-01-01T23:59:59.000Z

154

Preliminary finite element modeling of a piezoelectric actuated marine propulsion fin.  

E-Print Network [OSTI]

??New technologies surrounding composite materials and autonomous underwater vehicle (AUV) design have led to numerous studies involving the marine propulsion for these AUVs. AUVs traditionally… (more)

Streett, Andrew

2006-01-01T23:59:59.000Z

155

Preliminary Finite Element Modeling of a Piezoelectric Actuated Marine Propulsion Fin.  

E-Print Network [OSTI]

?? New technologies surrounding composite materials and autonomous underwater vehicle (AUV) design have led to numerous studies involving the marine propulsion for these AUVs. AUVs… (more)

Streett, Andrew R.

2006-01-01T23:59:59.000Z

156

High Fidelity Radiative Thermal Transport Simulations of a Scramjet Propulsion System.  

E-Print Network [OSTI]

??Scramjets are a type of air breathing propulsion system that have the potential to efficiently provide thrust for atmospheric vehicles at high speeds. Defining the… (more)

Irvine, Adam Glenn

2013-01-01T23:59:59.000Z

157

E-Print Network 3.0 - advanced propulsion concepts Sample Search...  

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

on the field emission principle... advanced technology in power conversion. The main advantages of a propulsion system based on the field emis... AS THRUSTERS FOR ELECTRIC SPACE...

158

E-Print Network 3.0 - advanced embedded propulsion Sample Search...  

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

12;EPA Sensor... inserts 72 layer drift tube created72 layer drift tube created 12;MicroMicro--Propulsion ... Source: Boise State University, Center for...

159

Micromachined chemical jet dispenser  

DOE Patents [OSTI]

A dispenser for chemical fluid samples that need to be precisely ejected in size, location, and time. The dispenser is a micro-electro-mechanical systems (MEMS) device fabricated in a bonded silicon wafer and a substrate, such as glass or silicon, using integrated circuit-like fabrication technology which is amenable to mass production. The dispensing is actuated by ultrasonic transducers that efficiently produce a pressure wave in capillaries that contain the chemicals. The 10-200 .mu.m diameter capillaries can be arranged to focus in one spot or may be arranged in a larger dense linear array (.about.200 capillaries). The dispenser is analogous to some ink jet print heads for computer printers but the fluid is not heated, thus not damaging certain samples. Major applications are in biological sample handling and in analytical chemical procedures such as environmental sample analysis, medical lab analysis, or molecular biology chemistry experiments.

Swierkowski, Steve P. (Livermore, CA)

1999-03-02T23:59:59.000Z

160

Investigation of propulsion system for large LNG ships  

Science Journals Connector (OSTI)

Requirements to move away from coal for power generation has made LNG as the most sought after fuel source, raising steep demands on its supply and production. Added to this scenario is the gradual depletion of the offshore oil and gas fields which is pushing future explorations and production activities far away into the hostile environment of deep sea. Production of gas in such environment has great technical and commercial impacts on gas business. For instance, laying gas pipes from deep sea to distant receiving terminals will be technically and economically challenging. Alternative to laying gas pipes will require installing re-liquefaction unit on board FPSOs to convert gas into liquid for transportation by sea. But, then because of increased distance between gas source and receiving terminals the current medium size LNG ships will no longer remain economical to operate. Recognizing this business scenario shipowners are making huge investments in the acquisition of large LNG ships. As power need of large LNG ships is very different from the current small ones, a variety of propulsion derivatives such as UST, DFDE, 2-Stroke DRL and Combined cycle GT have been proposed by leading engine manufacturers. Since, propulsion system constitutes major element of the ship's capital and life cycle cost, which of these options is most suited for large LNG ships is currently a major concern of the shipping industry and must be thoroughly assessed. In this paper the authors investigate relative merits of these propulsion options against the benchmark performance criteria of BOG disposal, fuel consumption, gas emissions, plant availability and overall life cycle cost.

R P Sinha; Wan Mohd Norsani Wan Nik

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Jets in heavy ion collisions with ATLAS  

E-Print Network [OSTI]

The energy loss of high-p_T partons provides insight into the transport properties of the medium created in relativistic heavy ion collisions. Evidence for this energy loss was first experimentally established through observation of high-p_T hadron suppression at RHIC. More recently, measurements of fully reconstructed jets have been performed at the LHC. In this summary the latest experimental results from the ATLAS collaboration on jet suppression are presented. In particular the jet suppression in inclusive jet yields, path length dependence of the jet suppression, photon-jet and Z^0-jet correlations, heavy flavor suppression, and jet fragmentation are discussed. These results establish qualitative features of the jet quenching mechanism as experimental fact and provide constraints on models of jet energy loss.

Martin Spousta; for the ATLAS Collaboration

2012-11-14T23:59:59.000Z

162

High power density propulsion/power system for underwater applications  

SciTech Connect (OSTI)

This patent describes a drive system for an underwater vehicle utilizing open Rankine thermodynamic cycle system having water as working fluid; steam generation means for receiving the working fluid and converting the working fluid to steam; an energy converter adapted to receive the steam and drive a propulsion means; a mixing condenser adapted to receive the steam exits the energy converter and condense the steam to a liquid; means for introducing water into the mixing condensers from a source external to the Rankine cycle, the water mixing with the working fluid to form mixed work fluid.

Blau, A.

1992-06-02T23:59:59.000Z

163

Integrated Design Platform for Marine Electric Propulsion System  

Science Journals Connector (OSTI)

As the modern vessels have become more complex comprising an increasing number of heterogeneous interdependent subsystems. This increased complexity requires new methods for the design and operation of these marine systems. An integrated design platform for marine electric propulsion system which aims to characteristic analysis of plants and systems, DCS control algorithm trim, intelligent control strategy develop of automation and operation is presented in this paper. The design process and thoughts is described in details, and the current work is introduced. The main focus of this paper is in the development of marine integrated design platform which seeks to shift ship design to a distribution, intelligent control architecture through increased automation.

Chen Yutao; Zeng Fanming; Wu Jiaming

2012-01-01T23:59:59.000Z

164

Propulsion and service power for New Orleans sternwheelers  

SciTech Connect (OSTI)

The spurt in designing and building casino and show boats for the U. S. inland waterways over the last few years opened up an opportunity for naval architects and marine engineers to work with a variety of imaginative boats. For example, on the newly built Grand Palais and Crescent City Queen, six 1200 r/min generator sets based on Caterpillar 3516TA engines and 1090 kW, 600-V Kato generators provide power to operate paddlewheels, Z-drives, and a complex of equipment. This paper describes the design, layout and electrical equipment and propulsion of the ships.

Clevenger, M.

1995-11-01T23:59:59.000Z

165

The Use of Steady and Pulsed Detonations for Propulsion Systems  

SciTech Connect (OSTI)

Objectives of the ODWE concept studies are: demonstrate the feasibility of the oblique detonation wave engine (ODWE) for hypersonic propulsion; demonstrate the existance and stability of an oblique detonation wave in hypersonic wind tunnels; develop engineering codes which predict the performance characteristics of the ODWE including specific impulse and thrust coefficients for various operating conditions; develop multi-dimensional computer codes which can model all aspects of the ODWE including fuel injection, mixing, ignition, combustion and expansion with fully detailed chemical kinetics and turbulence models; and validate the codes with experimental data use the simulations to predict the ODWE performance for conditions not easily obtained in wind tunnels.

Adelman, H.G.; Menees, G.P.; Cambier, J.L.; Bowles, J.V.

1996-02-01T23:59:59.000Z

166

ADVANCED RADIOISOTOPE HEAT SOURCE AND PROPULSION SYSTEMS FOR PLANETARY EXPLORATION  

SciTech Connect (OSTI)

The exploration of planetary surfaces and atmospheres may be enhanced by increasing the range and mobility of a science platform. Fundamentally, power production and availability of resources are limiting factors that must be considered for all science and exploration missions. A novel power and propulsion system is considered and discussed with reference to a long-range Mars surface exploration mission with in-situ resource utilization. Significance to applications such as sample return missions is also considered. Key material selections for radioisotope encapsulation techniques are presented.

R. C. O'Brien; S. D. Howe; J. E. Werner

2010-09-01T23:59:59.000Z

167

Latest jet results from the Tevatron  

SciTech Connect (OSTI)

A brief overview of the latest status of jet physics studies at the Tevatron in proton-antiproton collisions at {radical}s = 1.96 TeV is presented. In particular, measurements of the inclusive jet production cross-section, dijet production and searches for new physics, the ratio of the 3-jet to 2-jet production cross-sections, and the three-jet mass are discussed.

Price, Darren D.

2010-05-01T23:59:59.000Z

168

A theory for radial jet reattachment flow  

E-Print Network [OSTI]

, the velocity profile and mass entrainment are given accordrng to Goertler's t. wo- dimensional free jet theory. His analysrs of a free jet also assumes that. the turbulent eddy viscosity is constant ar ross the jet. (6) For the case of laminar flow... of total jet momentum. Laminar jet flow is approximated using Schlichting's velocity profile, whereas turbulent flow calculations are made assuming Goertler's velocity profile. Momentum integral principles are applied to the flow at reattachment...

Hadden, Lynne Loise

2012-06-07T23:59:59.000Z

169

Magnetohydrodynamic Production of Relativistic Jets  

Science Journals Connector (OSTI)

...of the properties of the MHD model. The diagram shows flow velocity...jet. Figure 3 Schematic diagram depicting the MHD acceleration and...of the properties of the MHD model. The diagram shows flow velocity...

David L. Meier; Shinji Koide; Yutaka Uchida

2001-01-05T23:59:59.000Z

170

Fault detection and diagnosis of a gearbox in marine propulsion systems using bispectrum analysis and artificial neural networks  

Science Journals Connector (OSTI)

A marine propulsion system is a very complicated system composed ... to the impact of the other components in marine propulsion systems. To monitor the gear conditions, ... fault features of the vibrant signal of...

Zhixiong Li; Xinping Yan; Chengqing Yuan…

2011-03-01T23:59:59.000Z

171

2011 International Workshop on Detonation for Propulsion November 14-15, 2011  

E-Print Network [OSTI]

2011 International Workshop on Detonation for Propulsion November 14-15, 2011 Paradise Hotel, Busan, Korea Summary of Recent Research on Detonation Wave Engines at UTA Donald R. Wilson,* Frank K. Lu on detonation waves related to propulsion is presented in this paper. A brief historical review of the early

Texas at Arlington, University of

172

Design, fabrication and analysis of a body-caudal fin propulsion system for a microrobotic fish  

E-Print Network [OSTI]

Design, fabrication and analysis of a body-caudal fin propulsion system for a microrobotic fish Kyu and fabrica- tion of a centimeter-scale propulsion system for a robotic fish. The key to the design are customized to provide the necessary work output for the microrobotic fish. The flexure joints, electrical

Wood, Robert

173

The 32nd International Electric Propulsion Conference, Wiesbaden, Germany September 11 15, 2011  

E-Print Network [OSTI]

The 32nd International Electric Propulsion Conference, Wiesbaden, Germany September 11 ­ 15, 2011 1 Electric Propulsion Conference, Wiesbaden · Germany September 11 ­ 15, 2011 K. Matyash1 , Max-Planck-Institut für Plasmaphysik, EURATOM Association, Greifswald, D-17491, Germany R. Schneider2 , Greifswald

174

Design and Control of the Induction Motor Propulsion of an Electric Vehicle  

E-Print Network [OSTI]

Design and Control of the Induction Motor Propulsion of an Electric Vehicle B. Tabbache1,2 , A for presizing the induction motor propulsion of an Electric Vehicle (EV). Based on the EV desired performances for different induction motor-based EVs using a siding mode control technique. Index Terms--Electric Vehicle (EV

Brest, Université de

175

An Exoskeleton Using Controlled Energy Storage and Release to Aid Ankle Propulsion  

E-Print Network [OSTI]

An Exoskeleton Using Controlled Energy Storage and Release to Aid Ankle Propulsion M. Bruce Wiggin Mellon University Pittsburgh, PA, USA Abstract -- Symmetric ankle propulsion is the cornerstone of efficient human walking. The ankle plantar flexors provide the majority of the mechanical work for the step

Collins, Steven H.

176

ASPECTS OF SENSORY CUES AND PROPULSION IN MARINE ZOOPLANKTON HYDRODYNAMIC DISTURBANCES  

E-Print Network [OSTI]

ASPECTS OF SENSORY CUES AND PROPULSION IN MARINE ZOOPLANKTON HYDRODYNAMIC DISTURBANCES A Thesis Institute of Technology December 2009 #12;ASPECTS OF SENSORY CUES AND PROPULSION IN MARINE ZOOPLANKTON Peterson and his colleagues at the Hatfield Marine Station for collection and care of the Euphausia

177

RESEARCH TRAINING GROUP GRK 1095/1: "AERO-THERMODYNAMIC DESIGN OF A SCRAMJET PROPULSION SYSTEM"  

E-Print Network [OSTI]

RESEARCH TRAINING GROUP GRK 1095/1: "AERO-THERMODYNAMIC DESIGN OF A SCRAMJET PROPULSION SYSTEM" U conception. In this context only the use of a scramjet-propulsion system meets all the aerodynamic it must be mentioned that scramjet-technologies are one of the key technologies for hypersonic flight

178

American Institute of Aeronautics and Astronautics Electrolysis Propulsion for CubeSat-Scale Spacecraft  

E-Print Network [OSTI]

is becoming clear. A water-electrolysis propulsion system for 3U CubeSats is proposed that could fill the gapAmerican Institute of Aeronautics and Astronautics 1 Electrolysis Propulsion for Cube as electrolyte. With over 1 km/s of V from 1 kg of water as propellant, sample missions include compensating

Peck, Mason A.

179

Hydrodynamic Efficiency of Ablation Propulsion with Pulsed Ion Beam  

SciTech Connect (OSTI)

This paper presents the hydrodynamic efficiency of ablation plasma produced by pulsed ion beam on the basis of the ion beam-target interaction. We used a one-dimensional hydrodynamic fluid compressible to study the physics involved namely an ablation acceleration behavior and analyzed it as a rocketlike model in order to investigate its hydrodynamic variables for propulsion applications. These variables were estimated by the concept of ablation driven implosion in terms of ablated mass fraction, implosion efficiency, and hydrodynamic energy conversion. Herein, the energy conversion efficiency of 17.5% was achieved. In addition, the results show maximum energy efficiency of the ablation process (ablation efficiency) of 67% meaning the efficiency with which pulsed ion beam energy-ablation plasma conversion. The effects of ion beam energy deposition depth to hydrodynamic efficiency were briefly discussed. Further, an evaluation of propulsive force with high specific impulse of 4000s, total impulse of 34mN and momentum to energy ratio in the range of {mu}N/W was also analyzed.

Buttapeng, Chainarong; Yazawa, Masaru; Harada, Nobuhiro [Department of Electrical Engineering, Nagaoka University of Technology, 1603-1, Kamitomioka, Nagaoka 940-2188 (Japan); Suematsu, Hisayuki; Jiang Weihua; Yatsui, Kiyoshi [Extreme Energy-Density Research Institute, Nagaoka University of Technology, 1603-1, Kamitomioka, Nagaoka 940-2188 (Japan)

2006-05-02T23:59:59.000Z

180

Beamed Core Antimatter Propulsion: Engine Design and Optimization  

E-Print Network [OSTI]

A conceptual design for beamed core antimatter propulsion is reported, where electrically charged annihilation products directly generate thrust after being deflected and collimated by a magnetic nozzle. Simulations were carried out using the Geant4 (Geometry and tracking) software toolkit released by the CERN accelerator laboratory for Monte Carlo simulation of the interaction of particles with matter and fields. Geant permits a more sophisticated and comprehensive design and optimization of antimatter engines than the software environment for simulations reported by prior researchers. The main finding is that effective exhaust speeds Ve ~ 0.69c (where c is the speed of light) are feasible for charged pions in beamed core propulsion, a major improvement over the Ve ~ 0.33c estimate based on prior simulations. The improvement resulted from optimization of the geometry and the field configuration of the magnetic nozzle. Moreover, this improved performance is realized using a magnetic field on the order of 10 T at the location of its highest magnitude. Such a field could be produced with today's technology, whereas prior nozzle designs anticipated and required major advances in this area. The paper also briefly reviews prospects for production of the fuel needed for a beamed core engine.

Ronan Keane; Wei-Ming Zhang

2012-05-16T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Air spring vibration isolation technology for ship propulsion engine  

Science Journals Connector (OSTI)

Propulsion engine (PE) is one of the most dominant noise sources of ship. Due to the imposed requirement of keeping alignment with propulsion shaft during operation the effective vibration isolation of PE using low frequency mount is difficult to implement as is often adopted by other onboard machinery. In this paper a low frequency air spring vibration isolation system (ASVIS) with alignment control strategy for PE is conceived and introduced. The application of ASVIS to PE presents both advantages and challenges which are discussed detailedly in the paper as well as the feasibility of the ASVIS concept. A systematic design method of ASVIS for PE is established with focus on the system mechanical behavior optimization and automatic alignment control algorithm development. An ASVIS prototype is designed and manufactured using the proposed method. The performance of the prototype is tested by a series of experiments including alignment control precision and isolation efficiency. Experimental results show that using ASVIS the vibration of PE can be attenuated to a satisfactory level with the alignment between PE and shaft being maintained in the safe range.

He Lin; Xu Wei; Shuai Changgeng

2012-01-01T23:59:59.000Z

182

Numerical Simulations of Bouncing Jets  

E-Print Network [OSTI]

Bouncing jets are fascinating phenomenons occurring under certain conditions when a jet impinges on a free surface. This effect is observed when the fluid is Newtonian and the jet falls in a bath undergoing a solid motion. It occurs also for non-Newtonian fluids when the jets falls in a vessel at rest containing the same fluid. We investigate numerically the impact of the experimental setting and the rheological properties of the fluid on the onset of the bouncing phenomenon. Our investigations show that the occurrence of a thin lubricating layer of air separating the jet and the rest of the liquid is a key factor for the bouncing of the jet to happen. The numerical technique that is used consists of a projection method for the Navier-Stokes system coupled with a level set formulation for the representation of the interface. The space approximation is done with adaptive finite elements. Adaptive refinement is shown to be very important to capture the thin layer of air that is responsible for the bouncing.

Bonito, Andrea; Lee, Sanghyun

2015-01-01T23:59:59.000Z

183

Production of jet fuels from coal-derived liquids. Volume 10. Jet fuels production by-products, utility, and sulfur-emissions control integration study. Interim report, 1 May 1988-1 April 1989  

SciTech Connect (OSTI)

In September 1986, the Fuels Branch of the Aero Propulsion Laboratory at Wright-Patterson Air Force Base, Ohio, began an investigation of the potential of jet-fuel production from the liquid by-product streams produced by the gasification of lignite at the Great Plains Gasification Plant (GPGP) in Beulah, North Dakota. Funding has been provided by the Department of Energy (DOE) Pittsburgh Energy Technology Center (PETC) to administer the experimental portion of this effort. This document reports the results of the effort by Burns and Roe Services Corporation/Science Applications International Corporation (BRSC/SAIC) to evaluate the impact of integrating Jet Fuel and/or Chemical Production Facilities with the Great Plains Gasification Plant.

Rossi, R.J.

1989-06-01T23:59:59.000Z

184

Full Fuel-Cycle Comparison of Forklift Propulsion Systems  

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

3 3 Full Fuel-Cycle Comparison of Forklift Propulsion Systems Energy Systems Division 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, 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 P.O. Box 62 Oak Ridge, TN 37831-0062 phone (865) 576-8401

185

Heavy Vehicle Propulsion Materials: Recent Progress and Future Plans  

SciTech Connect (OSTI)

The Heavy Vehicle Propulsion Materials Program provides enabling materials technology for the U.S. DOE Office of Heavy Vehicle Technologies (OHVT). The technical agenda for the program is based on an industry assessment and the technology roadmap for the OHVT. A five-year program plan was published in 2000. Major efforts in the program are materials for diesel engine fuel systems, exhaust aftertreatment, and air handling. Additional efforts include diesel engine valve-train materials, structural components, and thermal management. Advanced materials, including high-temperature metal alloys, intermetallics, cermets, ceramics, amorphous materials, metal- and ceramic-matrix composites, and coatings, are investigated for critical engine applications. Selected technical issues and planned and ongoing projects as well as brief summaries of several technical highlights are given.

D. Ray Johnson; Sidney Diamond

2001-05-14T23:59:59.000Z

186

Full Fuel-Cycle Comparison of Forklift Propulsion Systems  

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

Full Fuel-Cycle Comparison Full Fuel-Cycle Comparison of Forklift Propulsion Systems ANL/ESD/08-3 Energy Systems Division 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 P.O. Box 62 Oak Ridge, TN 37831-0062 phone (865) 576-8401 fax (865) 576-5728 reports@adonis.osti.gov 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 UChicago Argonne, LLC, nor any of their employees or officers, makes any warranty, express

187

Application of the enabler to nuclear electric propulsion  

Science Journals Connector (OSTI)

This paper describes a power system concept that provides the electric power for a baseline electric propulsion system for a piloted mission to Mars. A 10?MWe space power system is formed by coupling an Enabler reactor with a simple non?recuperated closed Brayton cycle. The Enabler reactor is a gas?cooled reactor based on proven reactor technology developed under the NERVA/Rover programs. The selected power cycle which uses a helium?xenon mixture at 1920 K at the turbine inlet is diagramed and described. The specific mass of the power system over the power range from 5 to 70 MWe is given. The impact of operating life on the specific mass of a 10?MWe system is also shown.

Bill L. Pierce

1991-01-01T23:59:59.000Z

188

The Georgi Algorithms of Jet Clustering  

E-Print Network [OSTI]

We reveal the direct link between the jet clustering algorithms recently proposed by Howard Georgi and parton shower kinematics, providing sound support from the theoretical side. The kinematics of this class of elegant algorithms is explored systematically and the jet function is generalized to $J^{(n)}_\\beta$ with a jet function index $n$. Based on three basic requirements that the result of jet clustering is process-independent, for softer subjets the inclusion cone is larger, and that the cone size cannot be too large in order to avoid mixing different jets, we derive constraints on the jet function index $n$ and the jet function parameter $\\beta$ which are closely related to phase space boundaries. Finally, we demonstrate that the jet algorithm is boost invariant.

Shao-Feng Ge

2014-08-30T23:59:59.000Z

189

NASA Subsonic Jet Transport Noise Reduction Research  

Science Journals Connector (OSTI)

Although new jet transport airplanes in today''s fleet are considerably quieter than the first jet transports introduced about 40 years ago, airport community noise continues to be an important environmental issue. NASA''s Advanced Subsonic Transport ...

Powell Clemans A.; Preisser John S.

2000-08-01T23:59:59.000Z

190

Coupling of twin rectangular supersonic jets  

E-Print Network [OSTI]

Twin jet plumes on aircraft can couple, producing dynamic pressures significant enough to cause structural fatigue. For closely spaced jets with a moderate aspect ratio (e.g. 5), previous work has established that two ...

Raman, G.; Taghavi, Ray

1998-01-01T23:59:59.000Z

191

Gravity waves from vortex dipoles and jets  

E-Print Network [OSTI]

The dissertation first investigates gravity wave generation and propagation from jets within idealized vortex dipoles using a nonhydrostatic mesoscale model. Several initially balanced and localized jets induced by vortex dipoles are examined here...

Wang, Shuguang

2009-05-15T23:59:59.000Z

192

Radioisotope electric propulsion of sciencecraft to the outer solar system and near-interstellar space  

SciTech Connect (OSTI)

Recent results are presented in the study of radioisotope electric propulsion as a near-term technology for sending small robotic sciencecraft to the outer Solar System and near-interstellar space. Radioisotope electric propulsion (REP) systems are low-thrust, ion propulsion units based on radioisotope electric generators and ion thrusters. Powerplant specific masses are expected to be in the range of 100 to 200 kg/kW of thrust power. Planetary rendezvous missions to Pluto, fast missions to the heliopause (100 AU) with the capability to decelerate an orbiter for an extended science program and prestellar missions to the first gravitational lens focus of the Sun (550 AU) are investigated.

Noble, R.J.

1998-08-01T23:59:59.000Z

193

Jet physics at HERA, Tevatron and LHC  

E-Print Network [OSTI]

In this short report, we discuss the Jet Physics results and perspectives at HERA, Tevatron and LHC.

C. Royon

2008-11-10T23:59:59.000Z

194

Jets in relativistic heavy ion collisions  

SciTech Connect (OSTI)

Several aspects of hard and semihard QCD jets in relativistic heavy ion collisions are discussed, including multiproduction of minijets and the interaction of a jet with dense nuclear matter. The reduction of jet quenching effect in deconfined phase of nuclear matter is speculated to provide a signature of the formation of quark gluon plasma. HIJING Monte Carlo program which can simulate events of jets production and quenching in heavy ion collisions is briefly described. 35 refs., 13 figs.

Wang, Xin-Nian; Gyulassy, M.

1990-09-01T23:59:59.000Z

195

Production of biocomponent containing jet fuels  

Science Journals Connector (OSTI)

Recent demands for low aromatic content jet fuels have shown significant increase in the last 20 years. This was generated by the growing of aviation. Further than quality requirements were more aggravated in front of jet fuels. This was generated by ... Keywords: aromatic content, biocomponent, crystallization point, jet fuel, kerosene, vegetable oil

Z. Eller; P. Solymosi; T. Kasza; Z. Varga; J. Hancsók

2011-12-01T23:59:59.000Z

196

Innovative nuclear thermal propulsion technology evaluation: Results of the NASA/DOE Task Team study  

SciTech Connect (OSTI)

In response to findings from two NASA/DOE nuclear propulsion workshops held in the summer of 1990, six task teams were formed to continue evaluation of various nuclear propulsion concepts. The Task Team on Nuclear Thermal Propulsion (NTP) created the Innovative Concepts Subpanel to evaluate thermal propulsion concepts which did not utilize solid fuel. The Subpanel endeavored to evaluate each of the concepts on a level technological playing field,'' and to identify critical technologies, issues, and early proof-of-concept experiments. The concepts included the liquid core fission, the gas core fission, the fission foil reactors, explosively driven systems, fusion, and antimatter. The results of the studies by the panel will be provided. 13 refs., 6 figs., 2 tabs.

Howe, S. (Los Alamos National Lab., NM (United States)); Borowski, S. (National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center); Motloch, C. (EG and G Idaho, Inc., Idaho Falls, ID (United States)); Helms, I. (Nuclear Utility Services, Damascus, MD (United States)); Diaz, N.; Anghaie, S. (Florida Univ., Gainesville, FL (United States)); Latham, T. (United

1991-01-01T23:59:59.000Z

197

Rotating Detonation Wave Propulsion: Experimental Challenges, Modeling, and Engine Concepts (Invited)  

E-Print Network [OSTI]

Rotating Detonation Wave Propulsion: Experimental Challenges, Modeling, and Engine Concepts, Arlington, Texas, 76019 Rotating detonation engines (RDEs), also known as continuous detonation engines of energy conversion that may be even more superior than pulse detonation engines, themselves the subject

Texas at Arlington, University of

198

Fabrication and characterization of sintered porous glass emitters for electrospray propulsion  

E-Print Network [OSTI]

Ionic electrospray thrusters are promising candidates for CubeSat propulsion systems in space, due to their low power requirement and small form factor. Current technology has demonstrated thrust levels of 10 - 40[mu]N, ...

Xie, Julie

2014-01-01T23:59:59.000Z

199

An impulse framework for hydrodynamic force analysis : fish propulsion, water entry of spheres, and marine propellers  

E-Print Network [OSTI]

This thesis presents an impulse framework for analyzing the hydrodynamic forces on bodies in flow. This general theoretical framework is widely applicable, and it is used to address the hydrodynamics of fish propulsion, ...

Epps, Brenden P

2010-01-01T23:59:59.000Z

200

Vehicle Technologies Office: 2013 Propulsion Materials R&D Annual Progress Report  

Broader source: Energy.gov [DOE]

This report describes the progress made during 2013 on the research and development projects funded by the Propulsion Materials subprogram in the Vehicle Technologies Office. Past year's reports are listed on the Annual Progress Reports page.

Note: This page contains sample records for the topic "jordana jet propulsion" 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

James Walker develops Walkersele D8 – a new rotary lip seal for marine propulsion systems  

Science Journals Connector (OSTI)

Walkersele D8 is a new design of rotary lip seal developed by James Walker & Co Ltd for use in marine propulsion systems to protect bearings from water ingress or prevent lubricant from leaking into the marine environment.

2012-01-01T23:59:59.000Z

202

Seeds of change Spore propulsion 23 JULY 2010 VOL 329 SCIENCE www.sciencemag.org388  

E-Print Network [OSTI]

Seeds of change Spore propulsion COMMENTARY 395392 23 JULY 2010 VOL 329 SCIENCE www or Bracing for Oil UNEASINESS HAS SETTLED ON THE UNIVERSITY OF MIAMI'S ROSENSTIEL School of Marine

Gurven, Michael

203

PC-Based Modeling and Simulation of Large Marine Propulsion Plant  

Science Journals Connector (OSTI)

At present, most of marine engine room simulators (MERS) in the ... So a simulation system of a PC-Based marine propulsion plant has been developed for training. In ... paper, a transient simulation model for lar...

Sun Jianbo; Guo Chen

2010-01-01T23:59:59.000Z

204

Optimization of Marine Propulsion System’s Alignment for Aged Ships  

Science Journals Connector (OSTI)

The paper presents a numerical method of identification parameters of marine power transmission system’s alignment in the ... engine and the second one with slow-speed propulsion system. Multivariant computations...

Lech Murawski; Wieslaw Ostachowicz

2010-01-01T23:59:59.000Z

205

Research on propeller dynamic load simulation system of electric propulsion ship  

Science Journals Connector (OSTI)

A dynamic marine propeller simulation system was developed, which is ... requirement of theory research and engineering design of marine electric propulsion system. By applying an actual ship parameter...J? ? K ...

Hui Huang ? ?; Ai-di Shen ???; Jian-xin Chu ???

2013-04-01T23:59:59.000Z

206

Research on simulation of ship electric propulsion system with flywheel energy storage system  

Science Journals Connector (OSTI)

Flywheel energy storage has been widely used to ... electric power quality. This paper designed a flywheel energy storage device to improve ship electric propulsion system power grid quality. The practical mathem...

Chunling Xie; Conghui Zhang; Jen-Yuan James Chang

2011-06-01T23:59:59.000Z

207

Research on simulation of ship electric propulsion system with flywheel energy storage system  

Science Journals Connector (OSTI)

Flywheel energy storage has been widely used to improve the ground electric power quality. This paper designed a flywheel energy storage device to improve ship electric propulsion system power grid quality. The practical mathematical models of flywheel ...

Chunling Xie; Conghui Zhang; Jen-Yuan James Chang

2011-06-01T23:59:59.000Z

208

Photoproduction of jets at NLO  

E-Print Network [OSTI]

A new next-to-leading order Monte Carlo program for the calculation of fully differential jet cross sections in photoproduction is described. The contributions from both resolved and direct components are included. A comparison between the theoretical predictions and ZEUS data is presented.

B. W. Harris; J. F. Owens

1996-08-20T23:59:59.000Z

209

The Particle Content of Extragalactic Jets  

E-Print Network [OSTI]

Recent x-ray and radio data from radio sources in galaxy clusters are used to show that the pdV work required to inflate the radio lobes exceeds all other energy estimates deduced from the radio emission. If the required jet energy density has an isotropic pressure, then in almost all cases the jet cannot be confined by an external medium. This problem can be resolved with jets dominated by cold protons, but even here the accompanying energy density in relativistic electons can cause decollimation. Electron-positron jets cannot solve this problem unless they are highly beamed with unusual energy distributions. Poynting flux jets may be a viable alternative.

David S. De Young

2006-05-31T23:59:59.000Z

210

Thermal-hydraulics Analysis of a Radioisotope-powered Mars Hopper Propulsion System  

SciTech Connect (OSTI)

Thermal-hydraulics analyses results produced using a combined suite of computational design and analysis codes are presented for the preliminary design of a concept Radioisotope Thermal Rocket (RTR) propulsion system. Modeling of the transient heating and steady state temperatures of the system is presented. Simulation results for propellant blow down during impulsive operation are also presented. The results from this study validate the feasibility of a practical thermally capacitive RTR propulsion system.

Robert C. O'Brien; Andrew C. Klein; William T. Taitano; Justice Gibson; Brian Myers; Steven D. Howe

2011-02-01T23:59:59.000Z

211

Heavy vehicle hybrid propulsion systems R and D program plan, FY 2000-2005  

SciTech Connect (OSTI)

This report contains the program plan and background information for the Heavy Vehicle Hybrid Propulsion R and D Program sponsored by the Department of Energy's Office of Heavy Vehicle Technologies. The program is a collaboration between industry and government established for the development of advanced hybrid-electric propulsion technology for urban cycle trucks and buses. It targets specific applications to enhance potential market success. Potential end-users are also involved.

None

2000-07-01T23:59:59.000Z

212

Radioisotope electric propulsion for robotic science missions to near-interstellar space  

SciTech Connect (OSTI)

The use of radioisotope electric propulsion for sending small robotic probes on fast science missions several hundred astronomical units (AU) from the Sun is investigated. Such missions would address a large variety of solar, interstellar, galactic and cosmological science themes from unique vantage points at 100 to 600 AU, including parallax distance measurements for the entire Milky Way Galaxy, sampling of the interstellar medium and imaging of cosmological objects at the gravitational lens foci of the Sun ({ge} 550 AU). Radioisotope electric propulsion (REP) systems are low-thrust, ion propulsion units based on multi-hundred watt, radioisotope electric generators and ion thrusters. In a previous work, the flight times for rendezvous missions to the outer planets (< 30 AU) using REP were found to be less than fifteen years. However fast prestellar missions to several hundred AU are not possible unless the probe`s energy can be substantially increased in the inner Solar System so as to boost the final hyperbolic excess velocity. In this paper an economical hybrid propulsion scheme combining chemical propulsion and gravity assist in the inner Solar System and radioisotope electric propulsion in the outer Solar System is studied which enables fast prestellar missions. Total hyperbolic excess velocities of 15 AU/year and flight times to 550 AU of about 40 years are possible using REP technology that may be available in the next decade.

Noble, R.J.

1994-10-01T23:59:59.000Z

213

Wave-like aquatic propulsion of mono-hull marine vessels  

Science Journals Connector (OSTI)

The present paper describes results of the experimental investigation of a small-scale mono-hull model boat propelled by a localised flexural wave propagating along the plate of finite width forming the boat's keel. Forward propulsion of the boat was achieved through flexural wave propagation in the opposite direction, which is similar to the aquatic propulsion used in nature by stingrays. The model boat under consideration underwent a series of tests both in a Perspex water tank and in an experimental pool. In particular, the forward velocity of the boat has been measured for different frequencies and amplitudes of the flexural wave. The highest velocity achieved was 32 cm/s. The thrust and propulsive efficiency have been measured as well. The obtained value of the propulsive efficiency in the optimum regime was 51%. This indicates that the efficiency of this type of aquatic propulsion is comparable to that of dolphins and sharks (around 75%) and to that of a traditional propeller (around 70%). In contrast with a propeller though, the wave-like aquatic propulsion has the following advantages: it does not generate underwater noise and it is safe for people and marine animals.

V.V. Krylov; E. Porteous

2010-01-01T23:59:59.000Z

214

Synthetic jets at large Reynolds number and comparison to continuous jets  

SciTech Connect (OSTI)

Experimental measurements and flow visualization of synthetic jets and similar continuous jets are described. The dimensionless stroke length necessary to form a 2-D synthetic jet is between 5 and 10, with wider-nozzle jets consistently requiring a smaller value. Synthetic jets are wider, slower and have more momentum than similar continuous jets. Synthetic jets are generated using four nozzle widths that vary by a factor of four, and the driving frequency is varied over an order of magnitude. The resultant jets are in the range 13.5 < L{sub o}/h < 80.8 and 695 < Re{sub Uo} < 14700. In spite of the large range of stroke lengths, the near-field behavior of the synthetic jets scales with L{sub o}/h.

Smith, B. L. (Barton L.); Swift, G. W. (Gregory W.)

2001-01-01T23:59:59.000Z

215

Jet Dipolarity: Top Tagging with Color Flow  

SciTech Connect (OSTI)

A new jet observable, dipolarity, is introduced that can distinguish whether a pair of subjets arises from a color singlet source. This observable is incorporated into the HEPTopTagger and is shown to improve discrimination between top jets and QCD jets for moderate to high p{sub T}. The impressive resolution of the ATLAS and CMS detectors means that a typical QCD jet at the LHC deposits energy in {Omicron}(10-100) calorimeter cells. Such fine-grained calorimetry allows for jets to be studied in much greater detail than previously, with sophisticated versions of current techniques making it possible to measure more than just the bulk properties of jets (e.g. event jet multiplicities or jet masses). One goal of the LHC is to employ these techniques to extend the amount of information available from each jet, allowing for a broader probe of the properties of QCD. The past several years have seen significant progress in developing such jet substructure techniques. A number of general purpose tools have been developed, including: (i) top-tagging algorithms designed for use at both lower and higher p{sub T} as well as (ii) jet grooming techniques such as filtering, pruning, and trimming, which are designed to improve jet mass resolution. Jet substructure techniques have also been studied in the context of specific particle searches, where they have been shown to substantially extend the reach of traditional search techniques in a wide variety of scenarios, including for example boosted Higgses, neutral spin-one resonances, searches for supersymmetry, and many others. Despite these many successes, however, there is every reason to expect that there remains room for refinement of jet substructure techniques.

Hook, Anson; Jankowiak, Martin; /SLAC /Stanford U., Phys. Dept.; Wacker, Jay G.; /SLAC

2011-08-12T23:59:59.000Z

216

Diesel fueled ship propulsion fuel cell demonstration project  

SciTech Connect (OSTI)

The paper describes the work underway to adapt a former US Navy diesel electric drive ship as a 2.4 Megawatt fuel cell powered, US Coast Guard operated, demonstrator. The Project will design the new configuration, and then remove the four 600 kW diesel electric generators and auxiliaries. It will design, build and install fourteen or more nominal 180 kW diesel fueled molten carbonate internal reforming direct fuel cells (DFCs). The USCG cutter VINDICATOR has been chosen. The adaptation will be carried out at the USCG shipyard at Curtis Bay, MD. A multi-agency (state and federal) cooperative project is now underway. The USCG prime contractor, AEL, is performing the work under a Phase III Small Business Innovation Research (SBIR) award. This follows their successful completion of Phases I and II under contract to the US Naval Sea Systems (NAVSEA) from 1989 through 1993 which successfully demonstrated the feasibility of diesel fueled DFCs. The demonstrated marine propulsion of a USCG cutter will lead to commercial, naval ship and submarine applications as well as on-land applications such as diesel fueled locomotives.

Kumm, W.H. [Arctic Energies Ltd., Severna Park, MD (United States)

1996-12-31T23:59:59.000Z

217

Safety Aspects of the use of LNG for Marine Propulsion  

Science Journals Connector (OSTI)

Liquefied natural gas (LNG) as a fuel shows a large energy to volume ratio. In addition, its combustion is characterized by low levels of production of CO2, SOX, NOX and particulate matter in comparison to conventional fuels. To reduce the emission of SOX into the atmosphere the sulphur content of heavy fuel oils used for marine propulsion will be restricted in the near future. However, LNG is a combustible cryogenic liquid and as such presents specific safety hazards. The large scale use of LNG in the marine sector requires appropriate transport, storage and transfer facilities. The risks connected with the operation of these facilities are analyzed. Specific safety characteristics of the equipment involved are incorporated in the analysis. Safety distances are determined based upon a study of the effects of accidents during which LNG is released. It is found that the pressure at which LNG is released during an accident greatly influences the effect distances. At pressures near atmospheric, the hazards of LNG are comparable to those of conventional liquid fuels such as gasoline. At higher pressures, it behaves more like a combustible gas liquefied by compression.

L. Vandebroek; J. Berghmans

2012-01-01T23:59:59.000Z

218

A comprehensive study of electric propulsion system for vehicular application  

Science Journals Connector (OSTI)

Electrification of vehicular systems partial or complete has emerged as an attractive and sustainable alternative for futuristic transportation systems. This so-called electric vehicular technology (EVT) has engaged auto-manufacturers and researchers to primarily focus on fuel economy driving range performance and costs. These parameters are influenced by the design and performance of electric propulsion system (EPS) for vehicular application and its suitable integration with various electrical and mechanical apparatus. This paper primarily presents a comprehensive study of EPS. To present the study in synthesis a survey of important constituents of EPS is first carried out with techno-economic perspectives. Contemporary configurations of conventional and electrified vehicles are then discussed along with their respective advantages and limitations. EPS is considered to be the heart of EVT and therefore components of a standard EPS are discussed and comparative analyses are carried out in terms of present trends ongoing technological advancements and future challenges. In addition power flow control and management algorithms for EVT are also briefed.

Lalit Kumar

2014-01-01T23:59:59.000Z

219

Advanced Fusion Reactors for Space Propulsion and Power Systems  

SciTech Connect (OSTI)

In recent years the methodology proposed for conversion of light elements into energy via fusion has made steady progress. Scientific studies and engineering efforts in advanced fusion systems designs have introduced some new concepts with unique aspects including consideration of Aneutronic fuels. The plant parameters for harnessing aneutronic fusion appear more exigent than those required for the conventional fusion fuel cycle. However aneutronic fusion propulsion plants for Space deployment will ultimately offer the possibility of enhanced performance from nuclear gain as compared to existing ionic engines as well as providing a clean solution to Planetary Protection considerations and requirements. Proton triggered 11Boron fuel (p- 11B) will produce abundant ion kinetic energy for In-Space vectored thrust. Thus energetic alpha particles' exhaust momentum can be used directly to produce high Isp thrust and also offer possibility of power conversion into electricity. p-11B is an advanced fusion plant fuel with well understood reaction kinematics but will require some new conceptual thinking as to the most effective implementation.

Chapman, John J.

2011-06-15T23:59:59.000Z

220

Light weight space power reactors for nuclear electric propulsion  

SciTech Connect (OSTI)

A Nuclear Electric Propulsion (NEP) unit capable of propelling a manned vehicle to MARS will be required to have a value of {alpha} (kg/kWe) which is less than five. In order to meet this goal the reactor mass, and thus its contribution to the value of {alpha} will have to be minimized. In this paper a candidate for such a reactor is described. It consists of a gas cooled Particle Bed Reactor (PBR), with specially chosen materials which allow it to operate at an exit temperature of approximately 2000 K. One of the unique features of a PBR is the direct cooling of particulate fuel by the working fluid. This feature allows for high power densities, highest possible gas exit temperatures, for a given fuel temperature and because of the thin particle bed a low pressure drop. The PBR's described in this paper will have a ceramic moderator (Be{sub 2}C), ZrC coated fuel particles and a carbon/carbon hot frit. All the reactors will be designed with sufficient fissile loading to operate at full power for seven years. The burn up possible with particulate fuel is approximately 30%--50%. These rector designs achieve a value of {alpha} less than unity in the power range of interest (5 MWe). 5 refs., 3 figs.

Ludewig, H.; Mughabghab, S.; Lazareth, O.; Perkins, K.; Schmidt, E.; Powell, J.R.

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Simple thermodynamics of jet engines  

Science Journals Connector (OSTI)

We use the first and second laws of thermodynamics to analyze the behavior of an ideal jet engine. Simple analytical expressions for the thermal efficiency the overall efficiency and the reduced thrust are derived. We show that the thermal efficiency depends only on the compression ratio r and on the velocity of the aircraft. The other two performance measures depend also on the ratio of the temperature at the turbine to the inlet temperature in the engine T 3 / T i . An analysis of these expressions shows that it is not possible to choose an optimal set of values of r and T 3 / T i that maximize both the overall efficiency and thrust. We study how irreversibilities in the compressor and the turbine decrease the overall efficiency of jet engines and show that this effect is more pronounced for smaller T 3 / T i .

Pedro Patrício; José M. Tavares

2010-01-01T23:59:59.000Z

222

Numerical Simulations of Bouncing Jets  

E-Print Network [OSTI]

downhill gliding of the pool, at about 4mm/s of pool surface velocity. . . . . . . . . . . . . . . . . . . . . . 87 viii 5.7 Overall view of the shampoo jet bouncing of an inclined pool of the same liquid. The white arrow points at he breakup of the air....4 Time discretization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 3.5 Entropy residual stabilization . . . . . . . . . . . . . . . . . . . . . . 58 3.6 Adaptive mesh refinement . . . . . . . . . . . . . . . . . . . . . . . . 61 iv 3.7...

Lee, Sanghyun

2014-07-18T23:59:59.000Z

223

How A Vessel of This Magnitude Was Moved : A Comparative Analysis of Confederate Ironclad Steam Engines Boilers and Propulsion Systems.  

E-Print Network [OSTI]

??The development of steam propulsion machinery in warships during the 19th century in conjunction with iron armor and shell guns resulted in a technological revolution… (more)

Bisbee, Saxon T.

2012-01-01T23:59:59.000Z

224

Combining Resummed Higgs Predictions Across Jet Bins  

E-Print Network [OSTI]

Experimental analyses often use jet binning to distinguish between different kinematic regimes and separate contributions from background processes. To accurately model theoretical uncertainties in these measurements, a consistent description of the jet bins is required. We present a complete framework for the combination of resummed results for production processes in different exclusive jet bins, focusing on Higgs production in gluon fusion as an example. We extend the resummation of the Higgs + 1-jet cross section into the challenging low transverse momentum region, lowering the uncertainties considerably. We provide combined predictions with resummation for cross sections in the Higgs + 0-jet and Higgs + 1-jet bins, and give an improved theory covariance matrix for use in experimental studies. We estimate that the relevant theoretical uncertainties on the signal strength in the Higgs to WW analysis are reduced by nearly a factor of 2 compared to the current value.

Radja Boughezal; Xiaohui Liu; Frank Petriello; Frank J. Tackmann; Jonathan R. Walsh

2013-12-16T23:59:59.000Z

225

LDV Measurement of Confined Parallel Jet Mixing  

SciTech Connect (OSTI)

Laser Doppler Velocimetry (LDV) measurements were taken in a confinement, bounded by two parallel walls, into which issues a row of parallel jets. Two-component measurements were taken of two mean velocity components and three Reynolds stress components. As observed in isolated three dimensional wall bounded jets, the transverse diffusion of the jets is quite large. The data indicate that this rapid mixing process is due to strong secondary flows, transport of large inlet intensities and Reynolds stress anisotropy effects.

R.F. Kunz; S.W. D'Amico; P.F. Vassallo; M.A. Zaccaria

2001-01-31T23:59:59.000Z

226

Jet-calculus approach including coherence effects  

Science Journals Connector (OSTI)

We show how integrodifferential equations typical of jet calculus can be combined with an averaging procedure to obtain jet-calculus-based results including the Mueller interference graphs. Results in longitudinal-momentum fraction x for physical quantities are higher at intermediate x and lower at large x than with the conventional ‘‘incoherent’’ jet calculus. These results resemble those of Marchesini and Webber, who used a Monte Carlo approach based on the same dynamics.

L. M. Jones; R. Migneron; K. S. S. Narayanan

1987-01-01T23:59:59.000Z

227

Entropy Production in Relativistic Jet Boundary Layers  

E-Print Network [OSTI]

Hot relativistic jets, passing through a background medium with a pressure gradient p \\propto r^{-\\eta} where 2 gamma-ray bursts from ...

Kohler, Susanna

2014-01-01T23:59:59.000Z

228

Increasing jet entrainment, mixing and spreading  

DOE Patents [OSTI]

A free jet of air is disturbed at a frequency that substantially matches natural turbulences in the free jet to increase the entrainment, mixing, and spreading of air by the free jet, for example in a room or other enclosure. The disturbances are created by pulsing the flow of air that creates the free jet at the desired frequency. Such pulsing of the flow of air can be accomplished by sequentially occluding and opening a duct that confines and directs the flow of air, such as by rotating a disk on an axis transverse to the flow of air in the duct. 11 figs.

Farrington, R.B.

1994-08-16T23:59:59.000Z

229

Atmospheric Plasma Jet Machining of Optical Surfaces  

Science Journals Connector (OSTI)

Deterministic surface machining with high spatial resolution and nanometric depth accuracy is urgently required in the fabrication of high-end optics. Thus, plasma jet tools with...

Böhm, Georg; Eichentopf, Inga-Maria; Arnold, Thomas

230

Numerical investigation of a transient free jet resembling a laser-produced vapor jet  

E-Print Network [OSTI]

jet. They reported the penetration length and spreading rate of a non-harmonic unsteady jet that the en- trainment rate varied linearly with axial penetration, and the total mass entrainment had a cubic to investigate the transient jet [1­3]. Kouros et al. [4] measured the spreading rate of an unsteady turbulent

Budair, Mohammed Omar

231

Drying characteristics of slot jet reattachment nozzle and comparison with a slot jet nozzle  

E-Print Network [OSTI]

the same flow power and flow exerted surface peak pressure. The same flow power results showed that +45[] and +20[] SJR nozzles performed better than the slot jet nozzle, while the 0[] SJR had drying characteristics similar to the slot jet. The slot jet...

Alam, Syed Aftab

2012-06-07T23:59:59.000Z

232

Development of 1 MW-class HTS motor for podded ship propulsion system  

Science Journals Connector (OSTI)

To reduce fuel consumption and lead to a major reduction of pollution from NOx, SOx and CO2, the electric ship propulsion system is one of the most prospective substitutes for conventional ship propulsion systems. In order to spread it, innovative technologies for the improvement of the power transmission are required. The high temperature superconducting technology has the possibility for a drastic reduction of power transmission loss. Recently, electric podded propulsions have become popular for large cruise vessels, icebreakers and chemical tankers because of the flexibility of the equipment arrangement and the stern hull design, and better maneuverability in harbour, etc. In this paper, a 1 MW-class High temperature superconducting (HTS) motor with high efficiency, smaller size and simple structure, which is designed and manufactured for podded propulsion, is reported. For the case of a coastal ship driven by the optimized podded propulsion in which the 1MW HTS motor is equipped, the reductions of fluid dynamic resistance and power transmission losses are demonstrated. The present research & development has been supported by the New Energy and Industrial Technology Development Organization (NEDO).

K Umemoto; K Aizawa; M Yokoyama; K Yoshikawa; Y Kimura; M Izumi; K Ohashi; M Numano; K Okumura; M Yamaguchi; Y Gocho; E Kosuge

2010-01-01T23:59:59.000Z

233

Plasma jets and plasma bullets  

Science Journals Connector (OSTI)

Plasma plumes, or plasma jets, belong to a large family of gas discharges whereby the discharge plasma is extended beyond the plasma generation region into the surrounding ambience, either by a field (e.g. electromagnetic, convective gas flow, or shock wave) or a gradient of a directionless physical quantity (e.g. particle density, pressure, or temperature). This physical extension of a plasma plume gives rise to a strong interaction with its surrounding environment, and the interaction alters the properties of both the plasma and the environment, often in a nonlinear and dynamic fashion. The plasma is therefore not confined by defined physical walls, thus extending opportunities for material treatment applications as well as bringing in new challenges in science and technology associated with complex open-boundary problems. Some of the most common examples may be found in dense plasmas with very high dissipation of externally supplied energy (e.g. in electrical, optical or thermal forms) and often in or close to thermal equilibrium. For these dense plasmas, their characteristics are determined predominantly by strong physical forces of different fields, such as electrical, magnetic, thermal, shock wave, and their nonlinear interactions [1]. Common to these dense plasma plumes are significant macroscopic plasma movement and considerable decomposition of solid materials (e.g. vaporization). Their applications are numerous and include detection of elemental traces, synthesis of high-temperature materials and welding, laser--plasma interactions, and relativistic jets in particle accelerators and in space [2]–[4]. Scientific challenges in the understanding of plasma jets are exciting and multidisciplinary, involving interweaving transitions of all four states of matter, and their technological applications are wide-ranging and growing rapidly. Using the Web of Science database, a search for journal papers on non-fusion plasma jets reveals that a long initial phase up to 1990 with only 31 papers per year on average, and a total of some 1300 papers, precedes a considerable growth of some 35–50% in research activity every five years, over the last 20 years or so. As shown in the table, the annual dissemination of the field is more than 1600 papers and the total number of papers is in excess of 20000. This upwards trajectory is typical of a strong and growing subject area in physical science, with considerable capacity in both fundamental science and applications. PeriodNumber of papersPapers per annum 1948–1990130031 1991–19952279456 1996–20003447689 2001–20054571914 2006–201066401328 2011 1658 In many of the dense plasma jets discussed above, strong physical forces generated by the plasma are often desired and this favours plasma generation at elevated gas pressure, including atmospheric pressure, which favours a high level of gas ionization. Historically it has been challenging to reduce and control the strong physical forces in high-pressure plasmas for applications where these are unwanted, for example, surface modification of polymeric sheets [5]. Indeed, there is a real need for a vast range of material processing applications at temperatures below 100oC (or below 400 K) and this favours atmospheric-pressure plasma jets sustained far from thermal equilibrium with the dissipated electrical energy largely used not in heat generation but in unleashing non-equilibrium chemical reactions. The long-standing difficulty of effectively controlling the level of gas ionization at atmospheric pressure was overcome by the technological breakthrough of achieving atmospheric-pressure glow discharges in the late 1980s [6]. A related challenge stemming from high collisionality of atmospheric-pressure plasmas (v >> ?0) means that large-area plasmas sustained between parallel-plate electrodes are very susceptible to strong plasma instabilities when molecular gases are introduced for processing applications. This led to an effective technological solution in the early to late 1990s of confining atmospheric plasmas in a small v

M G Kong; B N Ganguly; R F Hicks

2012-01-01T23:59:59.000Z

234

FY2001 Annual Progress Report for the Vehicle Propulsion & Ancillary Subsystems Program  

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

PROPULSION & PROPULSION & ANCILLARY SUBSYSTEMS 2 0 0 1 A N N UA L P R O G R E S S R E P O R T U.S. Department of Energy Energy Efficiency and Renewable Energy Office of Transportation Technologies A C K N O W L E D G E M E N T We would like to express our sincere appreciation to Argonne National Laboratory and Computer Systems Management, Inc., for their artistic and technical contributions in preparing and publishing this report. In addition, we would like to thank all our program participants for their contributions to the programs and all the authors who prepared the project abstracts that comprise this report. U.S. Department of Energy Office of Advanced Automotive Technologies 1000 Independence Avenue, S.W. Washington, D.C. 20585-0121 FY 2001 Annual Progress Report for the Vehicle Propulsion & Ancillary Subsystems Program

235

Space variations in axis height of the jet stream core  

E-Print Network [OSTI]

height of the jet axis relative to the height of the jet maximum for slow vs. fast cases. 13 Mean height of the jet axis relative to the height at the trough. 13 Mean height of the jet axis relative to the height at the ridge. 15 Mean height... of the jet axis relative to the height at the jet maximum, when the maximum is near a trough. 15 Mean height of the jet axis relative to the height at the minimum, when the minimum is near a ridge. 17 Mean height of the jet axis relative to the height...

Leutwyler, Cooke Hearon

1965-01-01T23:59:59.000Z

236

Simulation of jets at colliders  

Science Journals Connector (OSTI)

Abstract We review the development of the physics behind event generators during the last decade. After a more general description of parton showers, we focus mostly on the perturbative side of the simulations. Two newer developments of parton showers, as implemented in herwig++, are described in greater detail. Matching and merging of parton showers with fixed order computations are discussed. We describe some developments of multiple partonic interactions which are relevant for the simulation of jets from the underlying event, where the implementation in herwig++  is again taken as a generic example. Finally, we compare some event generator results to collider data from LEP and the LHC.

Stefan Gieseke

2013-01-01T23:59:59.000Z

237

Abstract--A fish-like propulsion system seems to be an interesting and efficient alternative to propellers in small  

E-Print Network [OSTI]

1 Abstract--A fish-like propulsion system seems to be an interesting and efficient alternative. Finally there is a description of the control system implementation for the tail's motion. Index terms--Fish propulsion, underwater robot, fish design. I. INTRODUCTION LTHOUGH almost all marine vehicles use propellers

Papadopoulos, Evangelos

238

PUBLISHED ONLINE: 20 JUNE 2010 | DOI: 10.1038/NPHYS1686 Propulsion generated by diffusion-driven flow  

E-Print Network [OSTI]

LETTERS PUBLISHED ONLINE: 20 JUNE 2010 | DOI: 10.1038/NPHYS1686 Propulsion generated by diffusion plates4 . Here we show that buoyancy-driven flows can also generate propulsion. Specifically, we find for transport processes in regions of varying fluid density, such as marine snow aggregation at ocean

Loss, Daniel

239

Fission Thrust sail as booster for high {\\Delta}v fusion based propulsion  

E-Print Network [OSTI]

The fission thrust sail as booster for nuclear fusion-based rocket propulsion for future starships is studied. Some required aspects of these systems such as neutron moderation and sail regeneration are discussed. First order calculations are used together with Monte Carlo simulations to assess system performance. When the fusion rocket has relatively low efficiency (~30%) in converting fusion fuel to a directed exhaust, adding a fission sail is shown to be beneficial for obtainable delta-v. Also, this type of fission-fusion hybrid interstellar propulsion has the potential to improve acceleration. Other advantages are discussed as well.

Ceyssens, Frederik; Driesen, Maarten

2014-01-01T23:59:59.000Z

240

Fuel-optimal Earth-Mars trajectories using low-thrust exhaust-modulated plasma propulsion  

E-Print Network [OSTI]

relerence frames Lx', y', r'I are different for the Earth and Mars references. The substitutions for the second-order derivatives required in the 27 differential equations are given by 2 VIM ISI CCS M + RM RM RM (2. 64) V V sin AM + RM cosltlM ( RM.... Characteristics of the Plasma Propulsion. . Equations of Motion. III NECESSARY CONDITIONS OF OPTIMALITY?. . . 14 15 16 30 Optimal Control Theory. Necessary Conditions of a Fuel-Optimal Earth-Mars Trajectory with Low-Thrust Plasma Propulsion...

Nah, Ren Sang

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Problems in developing bimodal space power and propulsion system fuel element  

SciTech Connect (OSTI)

The paper discusses design of a space nuclear power and propulsion system fuel element (PPFE) developed on the basis of an enhanced single-cell thermionic fuel element (TFE) of the 'TOPAZ-2' thermionic converter-reactor (TCR), and presents the PPFE performance for propulsion and power modes of operation. The choice of UC-TaC fuel composition is substantiated. Data on hydrogen effect on the PPFE output voltage are presented, design solutions are considered that allow to restrict hydrogen supply to an interelectrode gap (IEG). Long-term geometric stability of an emitter assembly is supported by calculated data.

Nikolaev, Yu. V.; Gontar, A. S.; Zaznoba, V. A.; Parshin, N. Ya.; Ponomarev-Stepnoi, N. N.; Usov, V. A. [Research Institute of SIA 'Lutch' Podolsk, Moscow Region, 142100 (Russian Federation); RRC 'Kurchatov Institute' Moscow, 123182 (Russian Federation)

1997-01-10T23:59:59.000Z

242

Miniconference on astrophysical jets P. M. Bellan  

E-Print Network [OSTI]

and numerical modelers of both astrophysical jets and spheromaks, and laboratory experimentalists. The purpose-organization. Spheromaks have been studied for the last two decades and most recently, it has been realized that the physics of spheromak formation has much in common with magnetohydrodynamically driven astrophysical jets

Bellan, Paul M.

243

Investigating Jet Mixing Using Electrical Resistance Tomography  

Science Journals Connector (OSTI)

Coaxial jet and side entry mixers are used in a wide range of industries for a variety of processes including precipitation polymerization and neutralization duties. Jet mixers are characterized by short contact times between the fluids and can be operated continuously or semi?batch. Coaxial and side entry jets can be designed in order to deliver rapid turbulent mixing using short sections of pipeline. As the energy required for mixing is provided by the addition stream the process?side pressure drop required for homogeneity is very low. A key design parameter for jet mixers is the mixing length the length of pipe downstream of the injection point required to achieve a given degree of homogeneity. The mixing length can be affected by the addition geometry (for example coaxial or side entry) orifice size and shape operating conditions and material properties. This paper presents the use of Electrical Resistance Tomography (ERT) to monitor jet mixing via the addition of a conductivity tracer through coaxial and side entry jets. Multiple ERT sensors are fitted along the pipe downstream of the jet addition point. The ERT sensors enable real time non?invasive measurement of conductivity within the pipe furnishing approximately 2500 conductivity measurements per ERT sensor when modeled independently in 3D. The effect of secondary (main pipe) flow rate and jet configuration on the nature of the tracer plume evolution and axial mixing is determined using this technique.

D. R. Stephenson; M. Cooke; A. Kowalski; T. A. York

2007-01-01T23:59:59.000Z

244

Jet multiplicities as the QGP thermometer  

E-Print Network [OSTI]

It is proposed to use the energy behavior of mean multiplicities of jets propagating in a nuclear medium as the thermometer of this medium during the collision phases. The qualitative effects are demonstrated in the framework of the fixed coupling QCD with account of jet quenching.

I. M. Dremin; O. S. Shadrin

2006-02-10T23:59:59.000Z

245

Anti-Spin Control for Marine Propulsion Systems yvind N. Smogeli1, Jostein Hansen2, Asgeir J. Srensen1 and Tor Arne Johansen2  

E-Print Network [OSTI]

Anti-Spin Control for Marine Propulsion Systems �yvind N. Smogeli1, Jostein Hansen2, Asgeir J. Sørensen1 and Tor Arne Johansen2 Abstract-- An anti-spin controller for marine propulsion systems in rough the transients in the power system and reduce the mechanical wear and tear of the propulsion system components

Johansen, Tor Arne

246

Production of jet fuels from coal-derived liquids. Volume 4. GPGP jet-fuels production program-feed analyses compilation and review. Interim report, October 1987-January 1988  

SciTech Connect (OSTI)

In September 1986, the Fuels Branch of the Aero Propulsion Laboratory at Wright-Patterson Air Force Base, Ohio, began an investigation of the potential of jet-fuel production from the liquid by-product streams produced by the gasification of lignite at the Great Plains Gasification Plant (GPGP) in Beulah, North Dakota. Funding was provided to the Department of Energy (DOE) Pittsburgh Energy Technology Center (PETC) to administer the experimental portion of this effort. This document reports the results of the effort by Burns and Roe Services Corporation/Science Applications International Corporation (BRSC/SAIC) to compile and review physical and chemical characterization data for the GPGP by-product liquids. This report describes the relative reliability of the various characterization data and indicates where specific limitations exist.

Rossi, R.J.

1988-07-01T23:59:59.000Z

247

A Flux-Limited Numerical Method for the MHD Equations to Simulate Propulsive Plasma Flows  

E-Print Network [OSTI]

to be effective tools in plasma propulsion research, a higher order accu- rate solver that captures MHD shocks approach, numerical simulations are valuable tools in plasma thruster research. More- over, simulations can Simula- tions The importance of numerical simulation in advancing plasma thruster research was realized

Choueiri, Edgar

248

The CU Aerospace / VACCO CubeSat High Impulse Propulsion System (CHIPS) offers a miniaturized and  

E-Print Network [OSTI]

· Overall control authority: roll, pitch, yaw, +/- Z · On-orbit update of system parameters, including · System two-failure-tolerant against leakage · Life span: 2+ years from propellant load. · HighThe CU Aerospace / VACCO CubeSat High Impulse Propulsion System (CHIPS) offers a miniaturized

Carroll, David L.

249

Introduction: Perspectives on Detonation-Based Propulsion DOI: 10.2514/1.26953  

E-Print Network [OSTI]

Introduction: Perspectives on Detonation-Based Propulsion DOI: 10.2514/1.26953 DETONATION, a shock, is one of the most rapid chemical energy release processes in nature. For self-sustained detonations. These rapid speeds are attained because the major mechanism of energy transport in a detonation is acoustic

250

Dynamic analysis and design of air spring mounting system for marine propulsion system  

Science Journals Connector (OSTI)

Abstract Marine propulsion unit (MPU) is one of the dominant vibration and noise sources onboard ship. Its vibration can be attenuated effectively by isolating MPU with low-frequency mounting system. But this is difficult to implement due to the stringent requirement of MPU alignment with the propulsion shafting. In this paper a novel air spring mounting system (ASMS) for propulsion system is proposed consisting of air spring subsystem, alignment control subsystem and safety protection subsystem. The load distribution optimization method and dynamic model of ASMS are presented. The factors that affect system stability and natural frequencies are analyzed, as well as the design measures to enhance system performance. A theoretical model is presented to estimate the isolation effect of ASMS. The monitoring model of alignment between MPU and propulsion shafting is established, followed by the alignment control algorithm and converge rule which assures the fast and uniform convergence of both air springs? load distribution and alignment control process. Safety protection mechanism is designed to ensure that the MPU can operate safely in case of ASMS failure or other extreme circumstances. A scaled ASMS prototype is manufactured and tested on a special experimental setup. Experimental results validate the effectiveness of theoretical models and show that the performance of ASMS satisfies the operation requirements of MPU.

Lin He; Wei Xu; Wenjun Bu; Liang Shi

2014-01-01T23:59:59.000Z

251

Propulsion efficiencies of magnetohydrodynamic propulsors considering electrical and magnetic end effects. Research and development report  

SciTech Connect (OSTI)

A mathematical theory for the performance of a direct current, rectangular duct magnetohydrodynamic (MBD) propulsion system propelling a marine vehicle is presented. The model accounts for the effects of spatially nonuniform magnetic fields and current distributions which are present at the ends of the propulsion unit. The theory is based on an approximate solution of the general NM duct flow problem in which the mutual interaction of the electric current and fluid flow in a strong magnetic field are considered in detail. For a specified vehicular steady state cruising speed, the propulsive efficiency and electrical power requirements can be calculated from the theory given the hydrodynamic drag of the vehicle and the properties of the fluid medium. Explicit electrical end loss factors are calculated to relate the performance of a propulsor with nonuniform field distributions to the performance of an idealized propulsor with no end losses operating under the same conditions. The power losses due to auxiliary equipment such as electrical generators, buswork, and magnetic cryogenic systems are not included in the study. Numerical results from the models for five design configurations for a nominal geometry under a reasonable range of operating parameters are presented. The numerical results, including the ideal propulsor with no end effects, indicate that the fringing magnetic and current distributions at the ends of the duct generally significantly degrade the propulsive efficiency. The degree of degradation depends on details of the design configuration of the rectangular duct.

Beatty, P.A.; Hughes, W.F.; Brown, S.H.; Walters, J.D.; Sondergaard, N.A.

1992-04-01T23:59:59.000Z

252

Design methodology based on H? control theory for marine propulsion system with bumpless transfer function  

Science Journals Connector (OSTI)

In this paper we propose a control system design methodology which has two main objectives: the first one is to achieve control system specifications for a local H? controller designed for a given operation condition, and the second ... Keywords: H controller, bumpless transfer, ship propulsion system

M. J. Lopez; L. Garcia; J. Lorenzo; A. Consegliere

2010-03-01T23:59:59.000Z

253

An Integrated Marine Propulsion System Utilising TRIGA{sup TM} Fuel  

SciTech Connect (OSTI)

This paper describes the reactor physics, shielding, thermal hydraulics, reactor dynamics and safety studies conducted to develop a proposed Integrated Marine Propulsion System (IMPS) utilising TRIGA{sup TM} type uranium zirconium hydride fuel. The study has demonstrated that the IMPS plant is feasible and meets the design safety principles and safety criteria imposed on the study. (authors)

Manach, G.; Monnez, J-P. [Ecole des Applications Militaires de l'Energie Atomique, Cherbourg (France); Freeman, M.J.; Newell, A.; Brushwood, J.M.; Thompson, A.; Collins, C.; Scholes, N.; Hamilton, P.J.; Beeley, P.A. [Nuclear Department/ Flagship Training Ltd, HMS Sultan, Military Road, Gosport, PO12 3BY (United Kingdom)

2004-07-01T23:59:59.000Z

254

Electric Motor Drive Selection Issues for HEV Propulsion Systems: A Comparative Study  

E-Print Network [OSTI]

Electric Motor Drive Selection Issues for HEV Propulsion Systems: A Comparative Study M. Zeraoulia1 Combustion Engine (ICE) and the electric motor to deliver power in parallel to drive the wheels. Since both the ICE and electric motor are generally coupled to the drive shaft of the wheels via two clutches

Paris-Sud XI, Université de

255

Control of a Linear Switched Reluctance Motor as a Propulsion System for Autonomous Railway Vehicles  

E-Print Network [OSTI]

Control of a Linear Switched Reluctance Motor as a Propulsion System for Autonomous Railway) and the linear switched reluctance motor (LSRM). Switched reluctance motors generally offer a very simple issue with the switched reluctance motors is the highly nonlinear magnetisation characteristic

Paderborn, Universität

256

Dedicated Laboratory Setup for CO{sub 2} TEA Laser Propulsion Experiments at Rensselaer Polytechnic Institute  

SciTech Connect (OSTI)

Laser propulsion research progress has traditionally been hindered by the scarcity of photon sources with desirable characteristics, as well as integrated specialized flow facilities in a dedicated laboratory environment. For TEA CO{sub 2} lasers, the minimal requirements are time-average powers of >100 W), and pulse energies of >10 J pulses with short duration (e.g., 0.1 to 1 {mu}s); furthermore, for the advanced pulsejet engines of interest here, the laser system must simulate pulse repetition frequencies of 1-10 kilohertz or more, at least for two (carefully sequenced) pulses. A well-equipped laser propulsion laboratory should have an arsenal of sensor and diagnostics tools (such as load cells, thrust stands, moment balances, pressure and heat transfer gages), Tesla-level electromagnet and permanent magnets, flow simulation facilities, and high-speed visualization systems, in addition to other related equipment, such as optics and gas supply systems. In this paper we introduce a cutting-edge Laser Propulsion Laboratory created at Rensselaer Polytechnic Institute, one of the very few in the world to be uniquely set up for beamed energy propulsion (BEP) experiments. The present BEP research program is described, along with the envisioned research strategy that will exploit current and expanded facilities in the near future.

Salvador, Israel I.; Kenoyer, David; Myrabo, Leik N.; Notaro, Samuel [Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, 12180 (United States)

2010-10-08T23:59:59.000Z

257

JOURNAL OF PROPULSION AND POWER Vol. 20, No. 6, NovemberDecember 2004  

E-Print Network [OSTI]

of Hall thrusters.1 High-energy exhaust par- ticles interact with the neutral background particles through to the panel. This paper reports on a neutral background pressure map of a vacuum chamber that is used to val and Electric Propulsion Laboratory, Department of Aerospace Engineering, 1052 FXB Building, 1320 Beal Avenue

Walker, Mitchell

258

JOURNAL OF PROPULSION AND POWER Vol. 9, No. 4, July-Aug. 1993  

E-Print Network [OSTI]

the rotor blades which is a function of the rotor circumferential position. This, in turn, results study show that the magnitude of this effect is a strong function of rotor-stator blade row spacingJOURNAL OF PROPULSION AND POWER Vol. 9, No. 4, July-Aug. 1993 Blade Row Interaction Effects

Giles, Mike

259

JOURNAL OF PROPULSION AND POWER Vol. 19, No. 2, MarchApril 2003  

E-Print Network [OSTI]

-temperaturema- terials for the turbine blades.For given size of the gas generator,the power that can be deliveredJOURNAL OF PROPULSION AND POWER Vol. 19, No. 2, March­April 2003 Conceptual Development of Quiet.The strategy is to takearepresentativestate-of-the-artmilitaryturbofanengineandincrease its bypass ratio

Papamoschou, Dimitri

260

2006-01-0443 Engine-in-the-Loop Testing for Evaluating Hybrid Propulsion  

E-Print Network [OSTI]

at the vehicle level. INTRODUCTION Diesel engines are particularly suited for medium-duty vehicles due in controlling engine operation and generally reduce the total mass of exhaust. However, it may not be possible2006-01-0443 Engine-in-the-Loop Testing for Evaluating Hybrid Propulsion Concepts and Transient

Peng, Huei

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Divergence of a Propulsive Plasma Flow Expanding through a Magnetic Nozzle  

E-Print Network [OSTI]

Divergence of a Propulsive Plasma Flow Expanding through a Magnetic Nozzle IEPC-2009-260 Presented, September 20-24, 2009 Justin M. Little and Edgar Y. Choueiri Princeton University, Princeton, NJ, 08544, USA An analytical expression for the divergence angle of an energetic plasma exhaust plume emerging from

Choueiri, Edgar

262

Optimization of direct drive induction motors for electric ship propulsion with high speed propellers  

Science Journals Connector (OSTI)

Direct drive electric ship propulsion can offer increased flexibility and reduced overall fuel consumption compared to geared mechanical systems [Davis 1987, Doerry 2007]. As a well-established technology, induction motors are a dependable and economical ... Keywords: AC motors, induction motor drives, induction motors, thermal analysis

S. C. Englebretson; J. L. Kirtley, Jr; C. Chryssostomidis

2009-07-01T23:59:59.000Z

263

Modeling and simulation of electric propulsion concepts for a multimodal prototype demonstrator  

Science Journals Connector (OSTI)

The Office of Naval Research (ONR) is planning a prototype demonstration of a novel craft envisioned to have three modes of operation: • Fuel-efficient, good sea keeping mode for open ocean transits • High-speed, shallow water mode • Amphibious ... Keywords: integrated power systems, microgrids, multimodal propulsion, naval electric power systems

J. Herbst; A. Gattozzi; J. Uglum; J. S. Chalfant; C. Chryssostomidis; J. Langston; M. Steurer; M. Andrus

2009-07-01T23:59:59.000Z

264

Composite Octet Searches with Jet Substructure  

SciTech Connect (OSTI)

Many new physics models with strongly interacting sectors predict a mass hierarchy between the lightest vector meson and the lightest pseudoscalar mesons. We examine the power of jet substructure tools to extend the 7 TeV LHC sensitivity to these new states for the case of QCD octet mesons, considering both two gluon and two b-jet decay modes for the pseudoscalar mesons. We develop both a simple dijet search using only the jet mass and a more sophisticated jet substructure analysis, both of which can discover the composite octets in a dijet-like signature. The reach depends on the mass hierarchy between the vector and pseudoscalar mesons. We find that for the pseudoscalar-to-vector meson mass ratio below approximately 0.2 the simple jet mass analysis provides the best discovery limit; for a ratio between 0.2 and the QCD-like value of 0.3, the sophisticated jet substructure analysis has the best discovery potential; for a ratio above approximately 0.3, the standard four-jet analysis is more suitable.

Bai, Yang; /SLAC; Shelton, Jessie; /Yale U.

2012-02-14T23:59:59.000Z

265

Dark jets in solar coronal holes  

E-Print Network [OSTI]

A new solar feature termed a dark jet is identified from observations of an extended solar coronal hole that was continuously monitored for over 44 hours by the EUV Imaging Spectrometer on board the Hinode spacecraft in 2011 February 8-10. Line-of-sight velocity maps derived from the coronal Fe XII $\\lambda$195.12 emission line, formed at 1.5 MK, revealed a number of large-scale, jet-like structures that showed significant blueshifts. The structures had either weak or no intensity signal in 193 A filter images from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory, suggesting that the jets are essentially invisible to imaging instruments. The dark jets are rooted in bright points and occur both within the coronal hole and at the quiet Sun-coronal hole boundary. They exhibit a wide range of shapes, from narrow columns to fan-shaped structures, and sometimes multiple jets are seen close together. A detailed study of one dark jet showed line-of-sight speeds increasing along the jet axis fr...

Young, Peter R

2015-01-01T23:59:59.000Z

266

Jet Reconstruction in Heavy Ion Collisions  

E-Print Network [OSTI]

Measurements of strong suppression of inclusive hadron distributions and di-hadron correlations at high $p_{T}$, while providing evidence for partonic energy loss, also suffer from geometric biases due to the competition of energy loss and fragmentation. The measurements of fully reconstructed jets is expected to lack these biases as the energy flow is measured independently of the fragmentation details. In this article, we review the recent results from the heavy ion collisions collected by the STAR experiment at RHIC on direct jet reconstruction utilizing the modern sequential recombination and cone jet reconstruction algorithms together with their background subtraction techniques. In order to assess the jet reconstruction biases a comparison with the jet cross section measurement in $\\sqrt{s}=200$ GeV p+p collisions scaled by the number of binary nucleon-nucleon collisions to account for nuclear geometric effects is performed. Comparison of the inclusive jet cross section obtained in central Au+Au events with that in $p+p$ collisions, published previously by STAR, suggests that unbiased jet reconstruction in the complex heavy ion environment indeed may be possible.

Sevil Salur

2009-05-12T23:59:59.000Z

267

Jet production in ep collisions Pierre Van Mechelen  

E-Print Network [OSTI]

Jet production in ep collisions Pierre Van Mechelen University of Antwerpen Pierre electroproduction #12; Jet production in ep collisions Pierre Van Mechelen HERA, H1 and ZEUS H1 ZEUS p (920 GeV) e ± (27.6 GeV) #12; Jet production in ep collisions Pierre Van Mechelen Jet finding algorithms Clustering

268

Squark and gluino production with jets  

SciTech Connect (OSTI)

We present cross section predictions for squark and gluino production at the LHC, in association with up to two additional hard jets. These cross sections can be very large in comparison to the inclusive Born rates. Because hadron collider experiments utilize hard jets in the reconstruction of cascade decays or as a way to separate squark and gluino production, the understanding of these processes is crucial. We show to what degree hard jet radiation can be described by shower algorithms and point out how tuning these showers, for example to top quark pair production, could help reduce theoretical uncertainties for new physics searches at the LHC.

Plehn, T.; /Munich, Max Planck Inst.; Rainwater, D.; /Rochester U.; Skands, P.; /Fermilab

2005-10-01T23:59:59.000Z

269

Jet spoiler arrangement for wind turbine  

DOE Patents [OSTI]

An air jet spoiler arrangement is provided for a Darrieus-type vertical axis wind-powered turbine. Air is drawn into hollow turbine blades through air inlets at the end thereof and is ejected in the form of air jets through small holes or openings provided along the lengths of the blades. The air jets create flow separation at the surfaces of the turbine blades, thereby including stall conditions and reducing the output power. A feedback control unit senses the power output of the turbine and controls the amount of air drawn into the air inlets accordingly.

Cyrus, J.D.; Kadlec, E.G.; Klimas, P.C.

1983-09-15T23:59:59.000Z

270

Top quark jets at the LHC  

Science Journals Connector (OSTI)

We investigate the reconstruction of high pT hadronically decaying top quarks at the Large Hadron Collider. One of the main challenges in identifying energetic top quarks is that the decay products become increasingly collimated. This reduces the efficacy of conventional reconstruction methods that exploit the topology of the top quark decay chain. We focus on the cases where the decay products of the top quark are reconstructed as a single jet, a “top jet.” The most basic “top-tagging” method based on jet mass measurement is considered in detail. To analyze the feasibility of the top-tagging method, both theoretical and experimental aspects of the large QCD jet background contribution are examined. Based on a factorization approach, we derive a simple analytic approximation for the shape of the QCD jet mass spectrum. We observe very good agreement with the Monte Carlo simulation. We consider high-pT tt¯ production in the standard model as an example, and show that our theoretical QCD jet mass distributions can efficiently characterize the background via sideband analyses. We show that with 25??fb-1 of data, our approach allows us to resolve top jets with pT?1??TeV, from the QCD background, and about 1.5 TeV top jets with 100??fb-1, without relying on b-tagging. To further improve the significance we consider jet shapes (recently analyzed in 10), which resolve the substructure of energy flow inside cone jets. A method of measuring the top quark polarization by using the transverse momentum of the bottom quark is also presented. The main advantages of our approach are (i) the mass distributions are driven by first principle calculations, instead of relying solely on Monte Carlo simulation; (ii) for high pT jets (pT?1??TeV), IR-safe jet shape variables are robust against detector resolution effects. Our analysis can be applied to other boosted massive particles such as the electroweak gauge bosons and the Higgs.

Leandro G. Almeida; Seung J. Lee; Gilad Perez; Ilmo Sung; Joseph Virzi

2009-04-16T23:59:59.000Z

271

“Bimodal” NTR and LANTR propulsion for human missions to Mars/Phobos  

Science Journals Connector (OSTI)

The nuclear thermal rocket (NTR) is one of the leading propulsion options for future human missions to Mars due to its high specific impulse (Isp ?850–1000 s) and attractive engine thrust-to-weight ratio (?3–10). Because only a miniscule amount of enriched uranium-235 fuel is consumed in a NTR during the primary propulsion maneuvers of a typical Mars mission engines configured for both propulsive thrust and modest power generation (referred to as “bimodal” operation) provide the basis for a robust “power-rich” stage enabling propulsive Mars capture and reuse capability. A family of modular “bimodal” NTR (BNTR) vehicles are described which utilize a common “core” stage powered by three 66.7 kN (?15 klbf) BNTRs that produce 50 kWe of total electrical power for crew life support an active refrigeration/reliquification system for long term “zero-boiloff” liquid hydrogen ( LH 2 ) storage and high data rate communications. Compared to other propulsion options a Mars mission architecture using BNTR transfer vehicles requires fewer transportation system elements which reduces mission mass cost and risk because of simplified space operations. For difficult Mars options such as a Phobos rendezvous and sample return mission volume (not mass) constraints limit the performance of the “all LH 2 ” BNTR stage. The use of “LOX-augmented” NTR (LANTR) engines operating at a modest oxygen-to-hydrogen (O/H) mixture ratio (MR) of 0.5 helps to increase “bulk” propellant density and total thrust during the trans-Mars injection (TMI) burn. On all subsequent burns the bimodal LANTR engines operate on LH 2 only ( MR =0) to maximize vehicle performance while staying within the mass limits of two ?80 t “Magnum” heavy lift launch vehicles (HLLVs).

Stanley K. Borowski; Leonard A. Dudzinski; Melissa L. McGuire

1999-01-01T23:59:59.000Z

272

Hypersonic Buckshot: Astrophysical Jets as Heterogeneous Collimated Plasmoids  

E-Print Network [OSTI]

Herbig-Haro (HH) jets are commonly thought of as homogeneous beams of plasma traveling at hypersonic velocities. Structure within jet beams is often attributed to periodic or ``pulsed'' variations of conditions at the jet source. Simulations based on this scenario result in knots extending across the jet diameter. Observations and recent high energy density laboratory experiments shed new light on structures below this scale and indicate they may be important for understanding the fundamentals of jet dynamics. In this paper we offer an alternative to ``pulsed'' models of protostellar jets. Using direct numerical simulations we explore the possibility that jets are chains of sub-radial clumps propagating through a moving inter-clump medium. Our models explore an idealization of this scenario by injecting small ($r\\rho_{jet}$) spheres embedded in an otherwise smooth inter-clump jet flow. The spheres are initialized with velocities differing from the jet velocity by $\\sim15$%. We find the consequences of shiftin...

Yirak, Kristopher; Cunningham, Andrew J; Mitran, Sorin

2008-01-01T23:59:59.000Z

273

Production of jet fuels from coal-derived liquids. Volume 7. GPGP jet-fuels production program. Evaluation of technical uncertainties for producing jet fuels from liquid by-products of the Great Plains gasification plant. Interim report, 2 October 1987-30 September 1988  

SciTech Connect (OSTI)

In September 1986, the Fuels Branch of the Aero Propulsion Laboratory at Wright-Patterson Air Force Base, Ohio, began an investigation of the potential of jet-fuel production from the liquid by-product streams produced by the gasification of lignite at the Great Plains Gasification Plant (GPGP) in Beulah, North Dakota. Funding was provided by the Department of Energy (DOE) Pittsburgh Energy Technology Center (PETC) to administer the experimental portion of this effort. This document reports the results of the effort by Burns and Roe Services Corporation/Science Applications International Corporation (BRSC/SAIC) to analyze GPGP operations and develop correlations for the liquid by-products and plant operating factors such as coal feed rate and coal characteristics.

Fraser, M.D.; Rossi, R.J.; Wan, E.I.

1989-01-01T23:59:59.000Z

274

Figure 2: The mercury jet target geometry. The proton beam and mercury jet cross at z=-37.5 cm.  

E-Print Network [OSTI]

Figure 2: The mercury jet target geometry. The proton beam and mercury jet cross at z=-37.5 cm. Figure 3: The layout of multiple proton beam entry directions relative to mercury jet at z=-75 cm. A PION of a free liquid mercury jet with an intense proton beam. We study the variation of meson production

McDonald, Kirk

275

The JET Project: Introduction and Background  

Science Journals Connector (OSTI)

...magnetic confinement of high-temperature plasma in conditions close to those needed for energy-producing controlled thermonuclear fusion reactors. Physically, JET is a very powerful toroidalpinch electric discharge in a strong stabilizing magnetic...

1987-01-01T23:59:59.000Z

276

Viscosity and jet quenching from holographic model  

E-Print Network [OSTI]

We consider the backreaction of the fundamental flavor degrees of freedom on the AdS$_5$-Schwarz background, and calculate their contributions to the shear viscosity and jet-quenching parameter of the thermal quark-gluon plasma.

Yi-hong Gao; Wei-shui Xu; Ding-fang Zeng

2007-07-05T23:59:59.000Z

277

Feasibility Study for a New Business Jet  

E-Print Network [OSTI]

This report demonstrates details of a feasibility study of a new business jet as an effort to complete the requirements for a field project (EMGT 835) in Engineering Management. The study is conducted during global economic crisis to identify a...

Mousa, Yasser Abdullah

2009-05-15T23:59:59.000Z

278

Inclusive jet cross section at CDF  

SciTech Connect (OSTI)

This contribution reports on preliminary measurements of the inclusive jet production cross section in p{bar p} collisions at {radical}s = 1.96 TeV using data collected with CDF corresponding to an integrated luminosity of 385 pb{sup -1}. Two analyzes are presented: one uses the longitudinally invariant k{sub T} algorithm to reconstruct the jets, the other uses the midpoint algorithm. Both are limited to jets with rapidity in the range 0.1 < |y{sup jet}| < 0.7. The measured cross sections are in good agreement with next-to-leading order perturbative QCD predictions after including the non-perturbative corrections necessary to account for underlying event and hadronization effects.

Lefevre, R.; Martinez, M.; /Barcelona, IFAE

2005-01-01T23:59:59.000Z

279

MULTIWAVELENGTH OBSERVATIONS OF THE SS 433 JETS  

E-Print Network [OSTI]

We present observations of the SS 433 jets using the Chandra High Energy Transmission Grating Spectrometer with contemporaneous optical and Very Long Baseline Array observations. The X-ray and optical emission line regions ...

Canizares, Claude R.

280

The JET Project: Introduction and Background  

Science Journals Connector (OSTI)

...confinement of high-temperature plasma in conditions close to those needed for energy-producing controlled thermonuclear fusion reactors. Physically, JET is a very powerful toroidalpinch electric discharge in a strong stabilizing magnetic...

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

New results on jet fragmentation at CDF  

SciTech Connect (OSTI)

Presented are the latest results of jet fragmentation studies at the Tevatron using the CDF Run II detector. Studies include the distribution of transverse momenta (Kt) of particles jets, two-particle momentum correlations, and indirectly global event shapes in p{bar p} collisions. Results are discussed within the context of recent Next-to-Leading Log calculations as well as earlier experimental results from the Tevatron and e{sup +}e{sup -} colliders.

Jindariani, Sergo; /Florida U.

2006-12-01T23:59:59.000Z

282

Measuring collinear W emissions inside jets  

E-Print Network [OSTI]

Single and multiple emission of electroweak gauge bosons and in particular of W bosons is discussed in the parton shower language. Algorithms and observables for the reconstruction of both leptonically and hadronically decaying W bosons inside light quark jets are compared, and they are applied to a study of how emission rates of W bosons in light-jet events at the LHC could be measured.

Frank Krauss; Petar Petrov; Marek Schoenherr; Michael Spannowsky

2014-03-19T23:59:59.000Z

283

Gap between jets at the LHC  

SciTech Connect (OSTI)

We describe a NLL BFKL calculation implemented in the HERWIG MC of the gap between jets cross section, that represent a test of BFKL dynamics. We compare the predictions with recent measurements at the Tevatron and present predictions for the LHC. We also discuss the interesting process of looking for gap between jets in diffractive events when protons are detected in the ATLAS Forward Physics (AFP) detectors.

Royon, Christophe [CEA/IRFU/Service de physique des particules, CEA/Saclay, 91191 Gif-sur-Yvette cedex (France)

2013-04-15T23:59:59.000Z

284

Probing nuclear matter with jet conversions  

SciTech Connect (OSTI)

We discuss the flavor of leading jet partons as a valuable probe of nuclear matter. We point out that the coupling of jets to nuclear matter naturally leads to an alteration of jet chemistry even at high transverse momentum p{sub T}. In particular, quantum chromodynamics (QCD) jets coupling to a chemically equilibrated quark gluon plasma in nuclear collisions will lead to hadron ratios at high transverse momentum p{sub T} that can differ significantly from their counterparts in p+p collisions. Flavor measurements could complement energy loss as a way to study interactions of hard QCD jets with nuclear matter. Roughly speaking they probe the inverse mean free path 1/{lambda} while energy loss probes the average squared momentum transfer {mu}{sup 2}/{lambda}. We present some estimates for the rate of jet conversions in a consistent Fokker-Planck framework and their impact on future high-p{sub T} identified hadron measurements at RHIC and LHC. We also suggest some novel observables to test flavor effects.

Liu, W. [Cyclotron Institute and Department of Physics, Texas A and M University, College Station, Texas 77843 (United States); Fries, R. J. [Cyclotron Institute and Department of Physics, Texas A and M University, College Station, Texas 77843 (United States); RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)

2008-05-15T23:59:59.000Z

285

The Infrared Jet in 3C31  

E-Print Network [OSTI]

We report the detection of infrared emission from the jet of the nearby FR I radio galaxy 3C 31. The jet was detected with the IRAC instrument on Spitzer at 4.5 micron, 5.8 micron, and 8.0 micron out to 30" (13 kpc) from the nucleus. We measure radio, infrared, optical, and X-ray fluxes in three regions along the jet determined by the infrared and X-ray morphology. Radio through X-ray spectra in these regions demonstrate that the emission can be interpreted as synchrotron emission from a broken power-law distribution of electron energies. We find significant differences in the high energy spectra with increasing distance from the nucleus. Specifically, the high energy slope increases from 0.86 to 1.72 from 1 kpc to 12 kpc along the jet, and the spectral break likewise increases in frequency along the jet from 10-100's of GHz to ~20 THz. Thus the ratio of IR to X-ray flux in the jet increases by at least an order of magnitude with increasing distance from the nucleus. We argue that these changes cannot simply ...

Lanz, Lauranne; Kraft, Ralph P; Birkinshaw, Mark; Lal, Dharam V; Forman, William R; Jones, Christine; Worrall, Diana M

2015-01-01T23:59:59.000Z

286

ATLAS jet and missing-ET reconstruction, calibration, and performance  

E-Print Network [OSTI]

The ATLAS experiment has achieved a very high precision on jet and missing transverse energy performance by the use of advanced calorimeter-based topological clustering and local cluster calibration, event-by-event pile-up subtraction methods, and in situ techniques to correct for the residual jet energy response difference between data and simulation. Tracking information is being combined with calorimeter to further improve the jet and missing transverse energy performance. ATLAS has also commissioned several new powerful tools for the analysis and interpretation of hadronic final states at the LHC such as jet substructure, jet mass, quark-gluon discrimination, and jet tagging tools for the identification of boosted heavy particles. An overview of the reconstruction, calibration, and performance of jets, missing transverse energy, jet substructure, and jet tagging at ATLAS is presented.

Berta, P; The ATLAS collaboration

2014-01-01T23:59:59.000Z

287

Received 22 May 2013 | Accepted 22 Jan 2014 | Published 18 Feb 2014 Bending rules for animal propulsion  

E-Print Network [OSTI]

or water. Models of animal propulsion often emulate patterns that have been established for hydrofoils structure that oscillates through the surrounding fluid with varying types of heaving and pitching motions6

Dabiri, John O.

288

AMER. ZOOL.,36:628-641 (1996) Transitions from Drag-based to Lift-based Propulsion in  

E-Print Network [OSTI]

aquatic mammals use lift-based propulsion with oscillating hydrofoils. Aerobic efficiencies are low- ficiency are maximized by swimming modes that use a lift-based oscillating hy- drofoil (i.e., cetacean

Fish, Frank

289

The Design and Feasibility of a 10 mN Chemical Space Propulsion Alexander Bruccoleri , Paulo Lozano  

E-Print Network [OSTI]

-1,400 to provide additional data to the community. The nozzle's coefficient of thrust efficiency is approximately class space propulsion systems and recommendations are given for propellant choice, valve and pump

290

Atmospheric-pressure plasma jet  

SciTech Connect (OSTI)

A {gamma}-mode, resonant-cavity plasma discharge that can be operated at atmospheric pressure and near room temperature using 13.56 MHz rf power is described. Unlike plasma torches, the discharge produces a gas-phase effluent no hotter than 250 C at an applied power of about 300 W, and shows distinct non-thermal characteristics. In the simplest design, two concentric cylindrical electrodes are employed to generate a plasma in the annular region there between. A jet of long-lived metastable and reactive species that are capable of rapidly cleaning or etching metals and other materials is generated which extends up to 8 in. beyond the open end of the electrodes. Films and coatings may also be removed by these species. Arcing is prevented in the apparatus by using gas mixtures containing He, which limits ionization, by using high flow velocities, and by properly shaping the rf-powered electrode. Because of the atmospheric pressure operation, no ions survive for a sufficiently long distance beyond the active plasma discharge to bombard a workpiece, unlike low-pressure plasma sources and conventional plasma processing methods.

Selwyn, G.S.

1999-10-05T23:59:59.000Z

291

PHOTOSPHERIC EMISSION FROM STRATIFIED JETS  

SciTech Connect (OSTI)

We explore photospheric emissions from stratified two-component jets, wherein a highly relativistic spine outflow is surrounded by a wider and less relativistic sheath outflow. Thermal photons are injected in regions of high optical depth and propagated until the photons escape at the photosphere. Because of the presence of shear in velocity (Lorentz factor) at the boundary of the spine and sheath region, a fraction of the injected photons are accelerated using a Fermi-like acceleration mechanism such that a high-energy power-law tail is formed in the resultant spectrum. We show, in particular, that if a velocity shear with a considerable variance in the bulk Lorentz factor is present, the high-energy part of observed gamma-ray bursts (GRBs) photon spectrum can be explained by this photon acceleration mechanism. We also show that the accelerated photons might also account for the origin of the extra-hard power-law component above the bump of the thermal-like peak seen in some peculiar bursts (e.g., GRB 090510, 090902B, 090926A). We demonstrate that time-integrated spectra can also reproduce the low-energy spectrum of GRBs consistently using a multi-temperature effect when time evolution of the outflow is considered. Last, we show that the empirical E{sub p}-L{sub p} relation can be explained by differences in the outflow properties of individual sources.

Ito, Hirotaka; Nagataki, Shigehiro; Ono, Masaomi; Lee, Shiu-Hang; Mao, Jirong [Astrophysical Big Bang Laboratory, RIKEN, Saitama 351-0198 (Japan); Yamada, Shoichi [Department of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 (Japan); Pe'er, Asaf [Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Mizuta, Akira [KEK Theory Center, Tsukuba 305-0801 (Japan); Harikae, Seiji, E-mail: hito@yukawa.kyoto-u.ac.jp [Quants Research Department, Financial Engineering Division, Mitsubishi UFJ Morgan Stanley Securities Co., Ltd., Mejirodai Bldg., 3-29-20 Mejirodai, Bunkyo-ku, Tokyo 112-8688 (Japan)

2013-11-01T23:59:59.000Z

292

Jet vetoes versus giant K-factors in the exclusive Z+1-jet cross section  

E-Print Network [OSTI]

The ATLAS measurement of the exclusive $Z$+1-jet cross section shows a surprising agreement with fixed-order predictions in the kinematic region expected to be dominated by large jet-veto logarithms. We identify the explanation for this effect: the jet-isolation criterion implemented by ATLAS allows dijet events where an energetic jet is collinear to a final-state lepton. This process contains a giant K-factor arising from the collinear emission of a Z-boson from the dijet configuration which overwhelms the effect of the jet-veto logarithms. We provide numerical results for 7 TeV, 8 TeV and 14 TeV LHC collisions that demonstrate the interplay between the jet-veto logarithms and the giant K-factor in the theoretical prediction. We suggest an alternate isolation criterion that removes the giant K-factor and allows for a direct test of the jet-veto resummation framework in the Z+1-jet process.

Boughezal, Radja; Liu, Xiaohui

2015-01-01T23:59:59.000Z

293

On self-propulsion of $N$-sphere micro-robot  

E-Print Network [OSTI]

The aim of this paper is to describe the self-propulsion of a micro-robot (or micro-swimmer) consisting of $N$ spheres moving along a fixed line. The spheres are linked to each other by arms with the lengths changing periodically. For the derivation, we use the asymptotic procedure containing the two-timing method and a distinguished limit. We show that in the main approximation, the self-propulsion velocity appears as a linear combination of velocities of all possible triplets of spheres. Velocities and efficiencies of three-, four-, and five-swimmers are calculated. The paper is devoted to H.K.Moffatt, who initiated the author's interests in low-Reynolds-number fluid dynamics.

Vladimir A. Vladimirov

2012-09-02T23:59:59.000Z

294

MULTIWAVELENGTH OBSERVATIONS OF THE SS 433 JETS  

SciTech Connect (OSTI)

We present observations of the SS 433 jets using the Chandra High Energy Transmission Grating Spectrometer with contemporaneous optical and Very Long Baseline Array observations. The X-ray and optical emission line regions are found to be related but not coincident as the optical line emission persists for days while the X-ray emission lines fade in less than 5000 s. The line Doppler shifts from the optical and X-ray lines match well, indicating that they are less than 3 × 10{sup 14} cm apart. The jet Doppler shifts show aperiodic variations that could result from shocks in interactions with the local environment. These perturbations are consistent with a change in jet direction but not jet speed. The proper motions of the radio knots match the kinematic model only if the distance to SS 433 is 4.5 ± 0.2 kpc. Observations during eclipse show that the occulted emission is very hard, seen only above 2 keV and rising to comprise >50% of the flux at 8 keV. The soft X-ray emission lines from the jet are not blocked, constraining the jet length to ?> 2 × 10{sup 12} cm. The base jet density is in the range 10{sup 10-13} cm{sup –3}, in contrast to our previous estimate based on the Si XIII triplet, which is likely to have been affected by UV de-excitation. There is a clear overabundance of Ni by a factor of about 15 relative to the solar value, which may have resulted from an unusual supernova that formed the compact object.

Marshall, Herman L.; Canizares, Claude R.; Schulz, Norbert S.; Nowak, Michael [Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States); Hillwig, Todd [Department of Physics and Astronomy, Valparaiso University, Valparaiso, IN 46383 (United States); Mioduszewski, Amy; Rupen, Michael [NRAO, P.O. Box 2, Socorro, NM 87801 (United States); Heinz, Sebastian, E-mail: hermanm@space.mit.edu, E-mail: crc@space.mit.edu, E-mail: nss@space.mit.edu, E-mail: mnowak@space.mit.edu, E-mail: todd.hillwig@valpo.edu, E-mail: amiodusz@nrao.edu, E-mail: mrupen@aoc.nrao.edu, E-mail: heinzs@astro.wisc.edu [Astronomy Department, 5408 Sterling Hall, University of Wisconsin, Madison, WI 53706 (United States)

2013-09-20T23:59:59.000Z

295

A Search for Jet Handedness in Hadronic $Z^0$ Decays  

E-Print Network [OSTI]

We have searched for signatures of polarization in hadronic jets from $Z^0 \\to q \\bar{q}$ decays using the ``jet handedness'' method. The polar angle asymmetry induced by the high SLC electron-beam polarization was used to separate quark jets from antiquark jets, expected to be left- and right-polarized, respectively. We find no evidence for jet handedness in our global sample or in a sample of light quark jets and we set upper limits at the 95% C.L. of 0.063 and 0.099 respectively on the magnitude of the analyzing power of the method proposed by Efremov {\\it et al.}

K. Abe

1995-01-13T23:59:59.000Z

296

Mars Mission Analysis Trades Based on Legacy and Future Nuclear Propulsion Options  

Science Journals Connector (OSTI)

The purpose of this paper is to discuss the results of mission?based system trades when using a nuclear thermal propulsion (NTP) system for Solar System exploration. The results are based on comparing reactor designs that use a ceramic?metallic (CERMET) graphite matrix graphite composite matrix or carbide matrix fuel element designs. The composite graphite matrix and CERMET designs have been examined for providing power as well as propulsion. Approaches to the design of the NTP to be discussed will include an examination of graphite composite carbide and CERMET core designs and the attributes of each in regards to performance and power generation capability. The focus is on NTP approaches based on tested fuel materials within a prismatic fuel form per the Argonne National Laboratory testing and the ROVER/NERVA program. NTP concepts have been examined for several years at Pratt & Whitney Rocketdyne for use as the primary propulsion for human missions beyond earth. Recently an approach was taken to examine the design trades between specific NTP concepts; NERVA?based (UC)C?Graphite (UC ZrC)C?Composite (U Zr)C?Solid Carbide and UO2?W CERMET. Using Pratt & Whitney Rocketdyne’s multidisciplinary design analysis capability a detailed mission and vehicle model has been used to examine how several of these NTP designs impact a human Mars mission. Trends for the propulsion system mass as a function of power level (i.e. thrust size) for the graphite?carbide and CERMET designs were established and correlated against data created over the past forty years. These were used for the mission trade study. The resulting mission trades presented in this paper used a comprehensive modeling approach that captures the mission vehicle subsystems and NTP sizing.

Russell Joyner; Andrea Lentati; Jaclyn Cichon

2007-01-01T23:59:59.000Z

297

Mars Mission Analysis Trades Based on Legacy and Future Nuclear Propulsion Options  

SciTech Connect (OSTI)

The purpose of this paper is to discuss the results of mission-based system trades when using a nuclear thermal propulsion (NTP) system for Solar System exploration. The results are based on comparing reactor designs that use a ceramic-metallic (CERMET), graphite matrix, graphite composite matrix, or carbide matrix fuel element designs. The composite graphite matrix and CERMET designs have been examined for providing power as well as propulsion. Approaches to the design of the NTP to be discussed will include an examination of graphite, composite, carbide, and CERMET core designs and the attributes of each in regards to performance and power generation capability. The focus is on NTP approaches based on tested fuel materials within a prismatic fuel form per the Argonne National Laboratory testing and the ROVER/NERVA program. NTP concepts have been examined for several years at Pratt and Whitney Rocketdyne for use as the primary propulsion for human missions beyond earth. Recently, an approach was taken to examine the design trades between specific NTP concepts; NERVA-based (UC)C-Graphite, (UC,ZrC)C-Composite, (U,Zr)C-Solid Carbide and UO2-W CERMET. Using Pratt and Whitney Rocketdyne's multidisciplinary design analysis capability, a detailed mission and vehicle model has been used to examine how several of these NTP designs impact a human Mars mission. Trends for the propulsion system mass as a function of power level (i.e. thrust size) for the graphite-carbide and CERMET designs were established and correlated against data created over the past forty years. These were used for the mission trade study. The resulting mission trades presented in this paper used a comprehensive modeling approach that captures the mission, vehicle subsystems, and NTP sizing.

Joyner, Russell [Pratt and Whitney Rocketdyne, West Palm Beach, Florida (United States); Lentati, Andrea [Georgia Institute of Technology, Atlanta, Georgia (United States); Cichon, Jaclyn [University of Florida, Gainesville, Florida (United States)

2007-01-30T23:59:59.000Z

298

Heavy vehicle propulsion system materials program semiannual progress report for April 1999 through September 1999  

SciTech Connect (OSTI)

The purpose of the Heavy Vehicle Propulsion System Materials Program is the development of materials: ceramics, intermetallics, metal alloys, and metal and ceramic coatings, to support the dieselization of class 1-3 trucks to realize a 35% fuel-economy improvement over current gasoline-fueled trucks and to support commercialization of fuel-flexible LE-55 low-emissions, high-efficiency diesel engines for class 7-8 trucks.

Johnson, D.R.

2000-01-01T23:59:59.000Z

299

Experimental Flash Pyrolysis of High Density1 PolyEthylene under Hybrid Propulsion Conditions2  

E-Print Network [OSTI]

1/25 Experimental Flash Pyrolysis of High Density1 PolyEthylene under Hybrid Propulsion Conditions2 Poly-Ethylene (HDPE) is studied6 up to 20 000 K.s-1 , under pressure up to 3.0 MPa and at temperature Pyrolysis (2013) 1-11" DOI : 10.1016/j.jaap.2013.02.014 #12;2/25 Keywords: Polyethylene; flash pyrolysis

Boyer, Edmond

300

Numerical models analysis of energy conversion process in air-breathing laser propulsion  

SciTech Connect (OSTI)

Energy source was considered as a key essential in this paper to describe energy conversion process in air-breathing laser propulsion. Some secondary factors were ignored when three independent modules, ray transmission module, energy source term module and fluid dynamic module, were established by simultaneous laser radiation transportation equation and fluid mechanics equation. The incidence laser beam was simulated based on ray tracing method. The calculated results were in good agreement with those of theoretical analysis and experiments.

Hong Yanji; Song Junling; Cui Cunyan; Li Qian [Academy of Equipment Command and Technology, 101416 Beijing (China)

2011-11-10T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Application of guided flexural waves in immersed plates to aquatic propulsion of mono?hull marine vessels  

Science Journals Connector (OSTI)

The present paper describes the results of the experimental investigation of a small?scale mono?hull model boat propelled by a localised flexural wave propagating along the plate of finite width forming the boat's keel. Forward propulsion of the boat was achieved through flexural wave propagation in the opposite direction which is similar to the aquatic propulsion used in nature by stingrays. The model boat under consideration underwent a series of tests both in a Perspex water tank and in the experimental pool. In particular the forward velocity of the boat has been measured for different frequencies and amplitudes of the flexural wave. The highest velocity achieved was 32 cm/s. The thrust and propulsive efficiency have been measured as well. The obtained value of the propulsive efficiency in the optimum regime was 51%. This indicates that efficiency of this type of aquatic propulsion is comparable to that of dolphins and sharks (around 75%) and to that of a traditional propeller (around 70%). In contrast to a propeller though the wavelike aquatic propulsion has the following advantages: it does not generate underwater noise and it is safe for people and marine animals.

Victor V. Krylov; Ewan Porteous

2008-01-01T23:59:59.000Z

302

Techno-economic and environmental risk analysis for advanced marine propulsion systems  

Science Journals Connector (OSTI)

A Techno-economic, Environmental and Risk Analysis (TERA) computational method has been developed for marine propulsion systems. The method comprises several numerical models which simulate the life cycle operation of marine gas turbines installed on marine vessels. Using a system-of-systems approach, the effect of operational profile can be taken into consideration in the assessment of a novel prime mover. Stochastic estimates of the powerplant’s life cycle net present cost are generated. The ship performance model plays a central role in the TERA method. This is an integrated virtual marine vessel operating environment that allows the calculation of engine performance and exhaust emissions (nitric oxide (NOx), carbon monoxide CO, carbon dioxide (CO2) and unburned hydrocarbon (UHC)) for a given trip. The life of the gas turbine is assessed through a creep-life prediction method, which plays a significant role on the maintenance cost calculation in the economic model. The economic model predicts net present cost over the operating life of the vessel using stochastic analysis of the earning capacity of the ship powered by the chosen prime mover. The TERA simulation of a 25 MW marine gas turbine powering a RoPax fast ferry in an integrated full electric propulsion system is presented as an illustration of the method. The example includes aspects of the systemic analysis of engine and ship performance, accompanied by environmental effect and engine life prediction, coupled with an economic feasibility stochastic study of the selected propulsion system under several journey and economic scenarios.

G. Doulgeris; T. Korakianitis; P. Pilidis; E. Tsoudis

2012-01-01T23:59:59.000Z

303

Concentration Distributions during Pulse Jet Mixing  

SciTech Connect (OSTI)

Obtaining real-time, in situ slurry concentration measurements during unsteady mixing can provide increased understanding into mixer performance. During recent tests an ultrasonic attenuation sensor was inserted into a mixing vessel to measure the slurry concentration during unsteady mixing in real time during pulse jet mixer operation. These pulse jet mixing tests to suspend noncohesive solids in Newtonian liquid were conducted at three geometric scales. To understand the solids suspension process and resulting solids distribution, the concentration of solids in the cloud was measured at various elevations and radial positions during the pulse jet mixer cycle. In the largest scale vessel, concentration profiles were measured at three radial locations: r = 0, 0.5 and 0.9 R where R is the vessel radius. These radial concentration data are being analyzed to provide a model for predicting concentration as a function of elevation. This paper describes pulse jet mixer operation, provides a description of the concentration probe, and presents transient concentration data obtained at three radial positions: in the vessel center (O R), midway between the center and the wall (0.5 R) and near the vessel wall (0.9 R) through out the pulse to provide insight into pulse jet mixer performance.

Bamberger, Judith A.; Meyer, Perry A.

2010-08-05T23:59:59.000Z

304

The minimum jet power and equipartition  

E-Print Network [OSTI]

We derive the minimum power of jets and their magnetic field strength based on their observed non-thermal synchrotron emission. The correct form of this method takes into account both the internal energy in the jet and the ion rest-mass energy associated with the bulk motion. The latter was neglected in a number of papers, which instead adopted the well-known energy-content minimization method. That method was developed for static sources, for which there is no bulk-motion component of the energy. In the case of electron power-law spectra with index >2 in ion-electron jets, the rest-mass component dominates. The minimization method for the jet power taking it into account was considered in some other work, but only based on either an assumption of a constant total synchrotron flux or a fixed range of the Lorentz factors. Instead, we base our method on an observed optically-thin synchrotron spectrum. We find the minimum jet power is independent of its radius when the rest-mass power dominates, which becomes th...

Zdziarski, Andrzej A

2014-01-01T23:59:59.000Z

305

HEFA and Fischer-Tropsch Jet Fuel Cost Analyses | Department...  

Energy Savers [EERE]

HEFA and Fischer-Tropsch Jet Fuel Cost Analyses HEFA and Fischer-Tropsch Jet Fuel Cost Analyses This is a presentation from the November 27, 2012, Sustainable Alternative Fuels...

306

Images in Emergency Medicine: Irritant Contact Dermatitis from Jet Fuel  

E-Print Network [OSTI]

and penetration of JP-8 jet fuel and its components. Toxicoland other kerosene-based fuels have been shown to cause skinContact Dermatitis from Jet Fuel Christopher C. Trigger, MD

Trigger, Christopher C; Eilbert, Wesley

2009-01-01T23:59:59.000Z

307

A study of the self-oscillating jet impingement nozzle  

E-Print Network [OSTI]

wave and flow fluctuations that need no external input. The new oscillating jet when used for impingement surface transport was labeled the Self-Oscillating Jet Impingement Nozzle. The objectives of this research were to characterize the gains in heat...

Chinnock, Paul Scott

1993-01-01T23:59:59.000Z

308

Applications of Underexpanded Jets in Hypersonic Aerothermodynamics Research  

E-Print Network [OSTI]

Applications of Underexpanded Jets in Hypersonic Aerothermodynamics Research Vladimir V. Riabov Abstract. A method of underexpanded hypersonic viscous jets has been developed to acquire experimental parameters are revealed. In the case of hypersonic stabilization, the Reynolds number and temperature factor

Riabov, Vladimir V.

309

ATLAS jet and missing ET reconstruction, calibration, and performance  

E-Print Network [OSTI]

ATLAS has achieved a very high precision on jet and missing transverse energy performance by the use of advanced calorimeter-based topological clustering and local cluster calibration, event-by-event pile-up subtraction methods, and in situ techniques to correct for the residual jet energy response difference between data and simulation. Tracking information is being combined with calorimeter to further improve the jet and missing ET performance. ATLAS has also commissioned several new powerful tools for for the analysis and interpretation of hadronic final states at the LHC such as jet substructure, jet mass, quark-gluon discrimination, and jet tagging tools for the identification of boosted heavy particles. An overview of the reconstruction, calibration and performance of jets, missing ET, and jet substructure and tagging at ATLAS is presented.

Crispin Ortuzar, M; The ATLAS collaboration

2014-01-01T23:59:59.000Z

310

Strategic Control of Transverse Jet Shear Layer Instabilities J. Davitian,  

E-Print Network [OSTI]

to the injection wall are considered. These studies develop a strategy for control based on separate experimental engines, dilution jet injection in gas turbine combustors, thrust vectoring jets, and turbine blade film

M'Closkey, Robert T.

311

Active noise control of supersonic impinging jet using pulsed microjets  

E-Print Network [OSTI]

This thesis concerns an active noise control of supersonic impinging jet flow using unsteady microjet injection. Supersonic impinging jet involves several problems such as lift loss, ground erosion, significant noise ...

Hong, Seung Hyuck

2009-01-01T23:59:59.000Z

312

Feedback control of flow separation using synthetic jets  

E-Print Network [OSTI]

The primary goal of this research is to assess the effect of synthetic jets on flow separation and provide a feedback control strategy for flow separation using synthetic jets. The feedback control synthesis is conducted based upon CFD simulation...

Kim, Kihwan

2006-04-12T23:59:59.000Z

313

Mixing enhancement by use of swirling jets  

SciTech Connect (OSTI)

It has been proposed that the mixing of fuel with air in the combustor of scramjet engines might be enhanced by the addition of swirl to the fuel jet prior to injection. This study investigated the effects of swirl on the mixing of a 30 deg wall jet into a Mach 2 flow. Cases with swirl and without swirl were investigated, with both helium and air simulating the fuel. Rayleigh scattering was used to visualize the flow, and seeding the fuel with water allowed it to be traced through the main flow. The results show that the addition of swirl to the fuel jet causes the fuel to mix more rapidly with the main flow, that larger amounts of swirl increase this effect, and that helium spreads better into the main flow than air. 12 refs.

Kraus, D.K.; Cutler, A.D.

1993-01-01T23:59:59.000Z

314

Constraints from jet calculus on quark recombination  

Science Journals Connector (OSTI)

Within the quantum-chromodynamic jet-calculus formalism, we deduce an equation describing recombination of quarks and antiquarks into mesons within a quark or gluon jet. This equation relates the recombination function R(x1,x2,x) used in current literature to the fragmentation function for producing that same meson out of the parton initiating the jet. We submit currently used recombination functions to our consistency test, taking as input mainly the u-quark fragmentation "data" into ?+ mesons. The qq¯?? recombination functions popular in the literature are consistent with measured fragmentation functions, but they must be supplemented by other contributions to provide the full Du?+. We also discuss the Q2 dependence of the resulting fragmentation functions.

L. M. Jones; K. E. Lassila; U. Sukhatme; D. Willen

1981-02-01T23:59:59.000Z

315

3-D GRMHD Simulations of Generating Jets  

E-Print Network [OSTI]

We have performed a first fully 3-D GRMHD simulation with Schwarzschild black hole with a free falling corona. The initial simulation results show that a jet is created as in the previous simulations using the axisymmetric geometry with the mirror symmetry at the equator. However, the time to generate the jet is longer than in the 2-D axisymmetric simulations. We expect that due to the additional freedom in the azimuthal dimension without axisymmetry with respect to the z axis and reflection symmetry with respect to the equatorial plane, the dynamics of jet formation can be modified. Further simulations are required for the study of instabilities along the azimuthal direction such as accretion-eject instability

Nishikawa, K I; Shibata, K; Kudoh, T; Sol, H

2002-01-01T23:59:59.000Z

316

3-D GRMHD Simulations of Generating Jets  

E-Print Network [OSTI]

We have performed a first fully 3-D GRMHD simulation with Schwarzschild black hole with a free falling corona. The initial simulation results show that a jet is created as in the previous simulations using the axisymmetric geometry with the mirror symmetry at the equator. However, the time to generate the jet is longer than in the 2-D axisymmetric simulations. We expect that due to the additional freedom in the azimuthal dimension without axisymmetry with respect to the z axis and reflection symmetry with respect to the equatorial plane, the dynamics of jet formation can be modified. Further simulations are required for the study of instabilities along the azimuthal direction such as accretion-eject instability

K. -I. Nishikawa; S. Koide; K. Shibata; T. Kudoh; H. Sol

2002-08-05T23:59:59.000Z

317

On the Misalignment of Jets in Microquasars  

E-Print Network [OSTI]

We discuss the timescales for alignment of black hole and accretion disc spins in the context of binary systems. We show that for black holes that are formed with substantial angular momentum, the alignment timescales are likely to be at least a substantial fraction of the systems' lifetimes. This result explains the observed misalignment of the disc and the jet in the microquasar GRO J 1655-40 and in SAX J 1819-2525 as being likely due to the Bardeen-Petterson effect. We discuss the implications of these results on the mass estimate for GRS 1915+105, which has assumed the jet is perpendicular to the orbital plane of the system and may hence be an underestimate. We show that the timescales for the spin alignment in Cygnus X-3 are consistent with the likely misalignment of disc and jet in that system, and that this is suggested by the observational data.

Thomas J. Maccarone

2002-09-05T23:59:59.000Z

318

On the Counter-jet Emission in GRB Afterglows  

SciTech Connect (OSTI)

We investigate the dynamical evolution of double-sided jets and present detailed numerical studies on the emission from the receding jet of gamma-ray bursts. It is found that the receding jet emission is generally very weak and only manifests as a plateau in the late time radio afterglow light curves. Additionally, we find that the effect of synchrotron self-absorption can influence the peak time of the receding jet emission significantly.

Wang Xin; Huang, Y. F. [Department of Astronomy, Nanjing University, Nanjing 210093 (China)

2010-10-15T23:59:59.000Z

319

IR diagnostics of embedded jets: velocity resolved observations of the HH34 and HH1 jets  

E-Print Network [OSTI]

We present VLT-ISAAC medium resolution spectroscopy of the HH34 and HH1 jets. Our aim is to derive the kinematics and the physical parameters and to study how they vary with jet velocity. We use several important diagnostic lines such as [FeII] 1.644um, 1.600um and H2 2.122um. In the inner jet region of HH34 we find that both the atomic and molecular gas present two components at high and low velocity. The [FeII] LVC in HH34 is detected up to large distances from the source (>1000 AU), at variance with TTauri jets. In H2 2.122um, the LVC and HVC are spatially separated. We detect, for the first time, the fainter red-shifted counterpart down to the central source. In HH1, we trace the jet down to ~1" from the VLA1 driving source: the kinematics of this inner region is again characterised by the presence of two velocity components, one blue-shifted and one red-shifted with respect to the source LSR velocity. In the inner HH34 jet region, ne increases with decreasing velocity. Up to ~10" from the driving source, and along the whole HH1 jet an opposite behaviour is observed instead, with ne increasing with velocity. In both jets the mass flux is carried mainly by the high-velocity gas. A comparison between the position velocity diagrams and derived electron densities with models for MHD jet launching mechanisms has been performed for HH34. While the kinematical characteristics of the line emission at the jet base can be, at least qualitatively, reproduced by both X-winds and disc-wind models, none of these models can explain the extent of the LVC and the dependence of electron density with velocity that we observe. It is possible that the LVC in HH34 represents gas not directly ejected in the jet but instead denser ambient gas entrained by the high velocity collimated jet.

R. Garcia Lopez; B. Nisini; T. Giannini; J. Eisloeffel; F. Bacciotti; L. Podio

2008-05-19T23:59:59.000Z

320

Heavy quarks in the jet calculus  

Science Journals Connector (OSTI)

In this paper we explore a method for treating heavy quarks such as c and b quarks within the jet calculus. These quarks are differentiated from the more common u, d, and s quarks by the requirement that the gluons never branch into heavy-quark pairs during the jet development. We compute and discuss the charmed-quark "propagators"; the x distribution of colorless clusters containing a charmed quark, a noncharmed antiquark, and gluons; and the mass distribution of the parent partons giving rise to these colorless clusters.

L. M. Jones

1983-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Jet energy flow at the LHC  

Science Journals Connector (OSTI)

We present a quantitative study of energy flow away from jets by numerically solving the evolution equation derived by Banfi, Marchesini, and Smye, and apply the result to two processes at the LHC: discriminating high-pt jets originating from decays of heavy electroweak bosons from the QCD background, and the survival probability of the BFKL-initiated dijet rapidity gaps. As a by-product, we find a hidden symmetry of the Banfi, Marchesini, and Smye equation which is a remnant of conformal symmetry.

Yoshitaka Hatta and Takahiro Ueda

2009-10-19T23:59:59.000Z

322

Gaseous Jets in Comet Hale-Bopp (1995 O1)  

Science Journals Connector (OSTI)

We report the identification of gas jets in comet Hale-Bopp in OH, NH, CN, C2 and C3. This is the first time OH and NH jets without an obvious optical dust jet counterpart have been identified in narrowband comet...

Susan M. Lederer; Humberto Campins; David J. Osip…

323

Large Eddy Simulations of Jet Flow Interactions Within Rod Bundles  

E-Print Network [OSTI]

The present work investigates the turbulent jet flow mixing of downward impinging jets within a staggered rod bundle based on previous experimental work. The two inlet jets had Reynold's numbers of 11,160 and 6,250 and were chosen to coincide...

Salpeter, Nathaniel O.

2010-07-14T23:59:59.000Z

324

Modélisation des machines asynchones et synchrones à aimants avec prise en compte des harmoniques d'espace et de temps : application à la propulsion marine par POD.  

E-Print Network [OSTI]

??Ce travail porte sur la modélisation et le dimensionnement des moteurs à aimants permanents et asynchrones destinés à la propulsion marine par POD. Un état… (more)

Lateb, Rambane

325

Modélisation des machines asynchrones et synchrones a aimants avec prise en compte des harmoniques d'espace et de temps : application à la propulsion marine par POD.  

E-Print Network [OSTI]

??Ce travail porte sur la modélisation et le dimensionnement des moteurs à aimants permanents et asynchrones destinés à la propulsion marine par POD. Un état… (more)

Lateb, Ramdane

2006-01-01T23:59:59.000Z

326

Preliminary Study Using ForwardPreliminary Study Using Forward Reaction Control System JetsReaction Control System Jets  

E-Print Network [OSTI]

Preliminary Study Using ForwardPreliminary Study Using Forward Reaction Control System JetsReaction Control System Jets During Space Shuttle EntryDuring Space Shuttle Entry Carolina Restrepo Currently the shuttle uses only aft RCS jets for yaw control during entry Enough to handle present flight

Valasek, John

327

A Novel Jet Model: Magnetically Collimated, Radiation-Pressure Driven Jet  

Science Journals Connector (OSTI)

......reminiscent of nonradiative MHD jets (Lynden-Bell 1996...luminosity-hardness ratio diagram, and reported evolutionary paths in the diagram. More importantly, they found...Recent general-relativistic MHD simulations can indeed achieve......

Shun Takeuchi; Ken Ohsuga; Shin Mineshige

2010-10-25T23:59:59.000Z

328

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

Science Journals Connector (OSTI)

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

E. B. Kulumbaev; T. B. Nikulicheva

2013-01-01T23:59:59.000Z

329

HYPERSONIC BUCKSHOT: ASTROPHYSICAL JETS AS HETEROGENEOUS COLLIMATED PLASMOIDS  

SciTech Connect (OSTI)

Herbig-Haro jets are commonly thought of as homogeneous beams of plasma traveling at hypersonic velocities. Structure within jet beams is often attributed to periodic or 'pulsed' variations of conditions at the jet source. Simulations based on this scenario result in knots extending across the jet diameter. Observations and recent high energy density laboratory experiments shed new light on structures below this scale and indicate they may be important for understanding the fundamentals of jet dynamics. In this paper, we offer an alternative to 'pulsed' models of protostellar jets. Using direct numerical simulations we explore the possibility that jets are chains of subradial clumps propagating through a moving interclump medium. Our models explore an idealization of this scenario by injecting small (r < r {sub jet}), dense ({rho}>{rho}{sub jet}) spheres embedded in an otherwise smooth interclump jet flow. The spheres are initialized with velocities differing from the jet velocity by {approx}15%. We find that the consequences of shifting from homogeneous to heterogeneous flows are significant as clumps interact with each other and with the interclump medium in a variety of ways. Structures which mimic what is expected from pulsed-jet models can form, as can be previously unseen, 'subradial' behaviors including backward facing bow shocks and off-axis working surfaces. While these small-scale structures have not been seen before in simulation studies, they are found in high-resolution jet observations. We discuss implications of our simulations for the interpretation of protostellar jets with regard to characterization of knots by a 'lifetime' or 'velocity history' approach as well as linking observed structures with central engines which produce the jets.

Yirak, Kristopher; Frank, Adam; Cunningham, Andrew J. [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14620 (United States); Mitran, Sorin [Department of Mathematics, Applied Mathematics Program, University of North Carolina, Chapel Hill, NC 27599 (United States)], E-mail: yirak@pas.rochester.edu

2009-04-20T23:59:59.000Z

330

Radio jets from stellar tidal disruptions  

Science Journals Connector (OSTI)

......nl A star that passes too close to a massive...time-dependent accretion rate. We apply this model...predict the snapshot rate of these events...accretion|black hole physics|galaxies: jets...predicted snapshot rate, we conclude that...lofar.org 3 www.physics.usyd.edu.au......

Sjoert van Velzen; Elmar Körding; Heino Falcke

2011-10-01T23:59:59.000Z

331

NLO Vector Boson Production With Light Jets  

SciTech Connect (OSTI)

In this contribution we present recent progress in the computation of next-to-leading order (NLO) QCD corrections for the production of an electroweak vector boson in association with jets at hadron colliders. We focus on results obtained using the virtual matrix element library BlackHat in conjunction with SHERPA, focusing on results relevant to understanding the background to top production. The production of a vector boson in association with several jets at the Large Hadron Collider (LHC) is an important background for other Standard Model processes as well as new physics signals. In particular, the production of a W boson in association with many jets is an important background for processes involving one or more top quarks. Precise predictions for the backgrounds are crucial to measurement of top-quark processes. Vector boson production in association with multiple jets is also a very important background for many SUSY searches, as it mimics the signatures of many typical decay chains. Here we will discuss how polarization information can be used as an additional handle to differentiate top pair production from 'prompt' W-boson production. More generally, ratios of observables, for example for events containing a W boson versus those containing a Z boson, are expected to be better-behaved as many uncertainties cancel in such ratios. Precise calculation of ratios, along with measurement of one of the two processes in the ratio, can be used in data-driven techniques for estimating backgrounds.

Bern, Z.; Diana, G.; Dixon, L.J.; Febres Cordero, F.; Forde, D.; Gleisberg, T.; Hoeche, S.; Ita, H.; Kosower, D.A.; Maitre, D.; Ozeren, K.

2012-02-15T23:59:59.000Z

332

Models comparison for JET polarimeter data  

SciTech Connect (OSTI)

A complete comparison between the theory and the measurements in polarimetry was done by using the Far Infrared Polarimeter at JET. More than 300 shots were analyzed, including a wide spectrum of JET scenarios in all critical conditions for polarimetry: high density, high and very low fields, high temperatures.This work is aimed at the demonstration of the robustness of the theoretical models for the JET polarimeter measurements in the perspective of using these models for ITER like plasma scenarios . In this context, an assessment was performed on how the line-integrated plasma density along the central vertical chord of FIR polarimeter could be evaluated using the Cotton-Mouton effect and its possible concrete use to correct fringe jumps of the interferometer.The models considered are: i) the rigorous numerical solution of the Stokes propagation equations, using dielectric tensor evaluated from JET equilibrium and Thomson scattering [1,2]; ii) two types of approximated solutions [2,3] and iii) the Guenther empirical model [4] that considers the mutual effect between Cotton-Mouton and Faraday rotation angle. The model calculations have been compared with polarimeter measurements for the Cotton-Mouton phase shift.The agreement with theory is satisfactory within the limits of experimental errors [3].

Mazzotta, C.; Orsitto, F. P.; Giovannozzi, E. [Centro Ricerche Energia Frascati, Euratom-ENEA Association, Frascati (Italy); Boboc, A.; Tudisco, O.; Zabeo, L. [Association EURATOM-UKAEA Culham Science Centre Abingdon 0X14 3DB (UK) (United Kingdom); Brombin, M.; Murari, A. [Consorzio RFX, Euratom-ENEA Association, Padova (Italy)

2008-03-12T23:59:59.000Z

333

HOT ELECTROMAGNETIC OUTFLOWS. II. JET BREAKOUT  

SciTech Connect (OSTI)

We consider the interaction between radiation, matter, and a magnetic field in a compact, relativistic jet. The entrained matter accelerates outward as the jet breaks out of a star or other confining medium. In some circumstances, such as gamma-ray bursts (GRBs), the magnetization of the jet is greatly reduced by an advected radiation field while the jet is optically thick to scattering. Where magnetic flux surfaces diverge rapidly, a strong outward Lorentz force develops and radiation and matter begin to decouple. The increase in magnetization is coupled to a rapid growth in Lorentz factor. We take two approaches to this problem. The first examines the flow outside the fast magnetosonic critical surface, and calculates the flow speed and the angular distribution of the radiation field over a range of scattering depths. The second considers the flow structure on both sides of the critical surface in the optically thin regime, using a relaxation method. In both approaches, we find how the terminal Lorentz factor and radial profile of the outflow depend on the radiation intensity and optical depth at breakout. The effect of bulk Compton scattering on the radiation spectrum is calculated by a Monte Carlo method, while neglecting the effects of internal dissipation. The peak of the scattered spectrum sits near the seed peak if radiation pressure dominates the acceleration, but is pushed to a higher frequency if the Lorentz force dominates. The unscattered seed radiation can form a distinct, low-frequency component of the spectrum, especially if the magnetic Poynting flux dominates.

Russo, Matthew [Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7 (Canada); Thompson, Christopher [Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, ON M5S 3H8 (Canada)

2013-08-20T23:59:59.000Z

334

Exploring jet-launching conditions for SFXTs  

E-Print Network [OSTI]

In the magneto-centrifugal mechanism for jet formation, accreting neutron stars are assumed to produce relativistic jets only if their surface magnetic field is weak enough ($B \\sim 10^8$ G). However, the most common manifestation of neutron stars are pulsars, whose magnetic field distribution peaks at $B \\sim 10^{12}$ G. If the neutron star magnetic field has at least this strength at birth, it must decay considerably before jets can be launched in binary systems. We study the magnetic field evolution of a neutron star that accretes matter from the wind of a high-mass stellar companion so that we can constrain the accretion rate and the impurities in the crust, which are necessary conditions for jet formation. We solved the induction equation for the diffusion and convection of the neutron star magnetic field confined to the crust, assuming spherical accretion in a simpliflied one-dimensional treatment. We incorporated state-of-the-art microphysics, including consistent thermal evolution profiles, and assume...

García, Federico; Romero, Gustavo E

2014-01-01T23:59:59.000Z

335

The Rapidity Dependence of Jet Quenching  

E-Print Network [OSTI]

The suppression of high transverse momentum (P_T) jets and hadrons in ultrarelativistic heavy-ion collisions with respect to a p-p baseline in terms of the nuclear suppression factor R_AA is one of the key observables to gauge the density of a hot and dense QCD medium. However, the suppression measured by R_AA is not a straightforward measure of the medium properties, the value of the observable also depends on the ratio of quark to gluon jets and on the slope of the hard parton spectrum, which explains why R_AA is found to be fairly similar at RHIC and LHC despite the very different dynamics. Measuring high P_T jets and hadrons at forward rapidity offers the same possibility of varying medium density, parton mixture and spectral slope without the need to compare across different sqrt(s) and experiments. In this work, the well-tested jet quenching Monte-Carlo (MC) framework YaJEM is utilized to compute the rapidity dependence of R_AA for three test cases.

Thorsten Renk

2014-06-26T23:59:59.000Z

336

The interaction between two radial jets  

E-Print Network [OSTI]

on an impingement surface with high surface heat and mass transfer. The objective of this study was to characterize the flow, surface pressure, and heat transfer for two radial jets as a function of nozzle geometry, in order to be able to design arrays of radial...

Gruber, Thomas Clifton

2012-06-07T23:59:59.000Z

337

JET and the Prospect for Nuclear Fusion  

Science Journals Connector (OSTI)

This paper describes the Joint European Torus (JET) device which was built as a European collaboration effort, with the aim of testing the scientific feasibility of producing controlled thermonuclear reactions between light nuclei with a net yield of energy. JET is the largest magnetic confinement machine in the world both in physical size and in the magnitude of the plasma current (5 ? 106 Amperes). The machine came into operation in mid-1983 and has followed the first stages of a planned evolution, in which the performance is progressively increased mainly by adding more heating power and which will culminate in eventual operation in a deuterium-tritium mixture. This will permit study of the plasma performance when there is a substantial power input from the ?-particle fusion products. So far operating in deuterium gas with 8 MW of additional heating by neutral beams, a peak ion temperature of 12 keV has been obtained with a corresponding fusion product (density ? confinement time) of 8 ? 1018 m-3 s. If the same conditions were to be achieved in a deuterium-tritium mixture, then the ratio of thermonuclear power output to the heating power input, Q, would be ~ 0.1. It is expected that following further technical improvements to JET, "scientific breakthrough" (namely Q = 1) will be achieved. The next step after JET will be to study a burning or ignited plasma in which no power input is required because energy losses are balanced by ?-particle heating. The requirements for such an experiment will become increasingly clear as more data is obtained from JET. At present it seems likely that a larger apparatus will be needed with a plasma current capability of 12-15 MA. These requirements for the thermonuclear furnace remain broadly consistent with the known technological constraints on an eventual power reactor.

R J Bickerton

1988-01-01T23:59:59.000Z

338

Potential applicability of the Los Alamos Antiproton Research Program to advanced propulsion  

SciTech Connect (OSTI)

The Los Alamos National Laboratory currently has a research program in antimatter interactions. The immediate objective of the program is to develop the low energy antiproton production capabilities at LEAR and the technology to store antiprotons. The initial experimental goal is to measure the gravitational mass of antiprotons. The technology required for the experiment, however, may allow high-density storage concepts to be experimentally investigated. Analysis of antiproton production over the last 30 years indicates that milligram quantities of antiprotons could conceivably be produced early in the next century. Thus, antiproton propulsion concepts may begin to be feasible. Some results of preliminary calculations pertinent to antiproton powered rocket engines will be presented.

Howe, S.D.; Hynes, M.V.; Prael, R.E.; Stewart, J.D.

1986-01-01T23:59:59.000Z

339

Packaging and deployment of a 5. 5 MWe potassium---Rankine nuclear electric propulsion spacecraft  

SciTech Connect (OSTI)

A design study was performed to investigate packaging and deployment options for the potassium---Rankine, nuclear electric propulsion (NEP) spacecraft described by Rovang (1992). The subject spacecraft is the cargo portion of a split-sprint (cargo/piloted) Mars mission, carrying 144 mt of cargo. Two parallel SP-100 type reactors, potassium---Rankine power conversion assemblies, and argon ion thrusters are utilized in the selected architecture. A spacecraft design and deployment approach which uses two heavy lift launch vehicles (HLLV) to insert the entire spacecraft into low Earth orbit is presented.

Rovang, R.D.; Marko, M. (Rockwell International, Rocketdyne Division, 6633 Canoga Avenue, P.O. Box 7922, Canoga Park, California 91309-7922 (United States))

1993-01-20T23:59:59.000Z

340

Application of scalar implicit approximate factorization for underwater magnetohydrodynamic propulsion concept analyses  

SciTech Connect (OSTI)

Numerical procedures have been developed to analyze multidimensional flow and imposed electromagnetic fields associated with a marine magnetohydrodynamic (MHD) propulsion concept. Chorin's artificial compressibility treatment is applied to determine the incompressible flowfield both internal and external to the MHD thruster, using a zonal formulation. Both inviscid and viscous flow are considered. Determination of three-dimensional magnetic, electric, and Lorentz force fields is based on suitable idealizations. This provides indicative results without getting into detailed sytem design considerations. Among other conclusions, it is established that secondary flow induced by the nonuniform Lorentz force is not a key issue in the magnet end-turn regions. 17 refs.

Choi, D.; Knight, C.J. (Textron Defense Systems, Everett, MA (United States))

1993-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Modular axial-flux permanent-magnet motor for ship propulsion drives  

SciTech Connect (OSTI)

Original features such as compactness and lightness make slotless axial-flux permanent-magnet machines (AFPMs) eligible for application in large power motor drives devoted to the direct drive of ship propellers. This paper discusses characteristics of AFPMs designed for application in marine propulsion, and machine performances such as efficiency, weight and torque density are evaluated for a comparison with those of conventional synchronous machines. A newly-conceived modular arrangement of the machine stator winding is proposed and experimental results taken from a small-size machine prototype are finally shown.

Caricchi, F.; Crescimbini, F.; Honorati, O.

1999-09-01T23:59:59.000Z

342

Integrated Modular Propulsion and Regenerative Electro-energy Storage System (IMPRESS) for small satellites  

SciTech Connect (OSTI)

The IMPRESS is a significant advancement in space system technology as it is able to operate alternately as a fuel cell to produce electrical power from stored hydrogen and oxygen and as a water electrolyzer using electrical power to produce hydrogen and oxygen from stored water. The electrolysis of a controllable fraction of stored water can provide high Isp rocket propellants on demand. The heart of the IMPRESS is the Unitized Regenerative Fuel Cell (URFC), which produces power and electrolytically regenerates its reactants using a single stack of reversible cells. This integrated approach has several significant advantages over separate (battery) power and propulsion systems.

Mitlitsky, F. [Lawrence Livermore National Lab., CA (United States); de Groot, W. [Nyma, Inc., Brook Park, OH (United States); Butler, L.; McElroy, J. [United Technologies Corp., Windsor Locks, CT (United States). Hamilton Standard Div.

1996-09-01T23:59:59.000Z

343

Comment on “Life-Cycle Analysis of Alternative Automobile Fule/Propulsion Technologies”  

Science Journals Connector (OSTI)

Comment on “Life-Cycle Analysis of Alternative Automobile Fule/Propulsion Technologies” ... It should also be noted that the GHG emissions attributable to electric vehicles are not reported at all, except in Table 1 where they are listed as comparable to the 1998 Ford Taurus, which serves as the baseline vehicle. ... A life-cycle perspective analyzed fossil fuels (conventional unleaded and reformulated gasolines, low S reformulated diesel, compressed natural gas [CNG]), biomass ethanol, and electricity together with current and advanced internal combustion engines (ICE, indirect [port] and direct injection, spark, and compression ignited) and elec. ...

Thomas P. Seager; Randy L. Brown

2001-03-17T23:59:59.000Z

344

Hypersonic Buckshot: Astrophysical Jets as Heterogeneous Collimated Plasmoids  

E-Print Network [OSTI]

Herbig-Haro (HH) jets are commonly thought of as homogeneous beams of plasma traveling at hypersonic velocities. Structure within jet beams is often attributed to periodic or ``pulsed'' variations of conditions at the jet source. Simulations based on this scenario result in knots extending across the jet diameter. Observations and recent high energy density laboratory experiments shed new light on structures below this scale and indicate they may be important for understanding the fundamentals of jet dynamics. In this paper we offer an alternative to ``pulsed'' models of protostellar jets. Using direct numerical simulations we explore the possibility that jets are chains of sub-radial clumps propagating through a moving inter-clump medium. Our models explore an idealization of this scenario by injecting small ($r\\rho_{jet}$) spheres embedded in an otherwise smooth inter-clump jet flow. The spheres are initialized with velocities differing from the jet velocity by $\\sim15$%. We find the consequences of shifting from homogeneous to heterogeneous flows are significant as clumps interact with each other and with the inter-clump medium in a variety of ways. Structures which mimic what is expected from pulsed-jet models can form, as can previously unseen ``sub-radial'' behaviors including backward facing bow shocks and off-axis working surfaces. While these small-scale structures have not been seen before in simulation studies, they are found in high resolution jet observations. We discuss implications of our simulations for the interpretation of protostellar jets with regard to characterization of knots by a ``lifetime'' or ``velocity history'' approach as well as linking observed structures with central engines which produce the jets.

Kristopher Yirak; Adam Frank; Andrew J. Cunningham; Sorin Mitran

2008-05-30T23:59:59.000Z

345

Jet Propulsion Laboratory (JPL) Agency Introduction: The FY 2012 budget request for NASA is $18.7 billion, the FY 2010 enacted  

E-Print Network [OSTI]

-guided projects aligned with the laboratory's Communications, Navigation and Entry, Descent and Landing expertise missions encounters two comets (EPOXI and Stardust NEXT missions), launches the Earth science Aquarius

346

Jet Propulsion LaboratoryA N N U A L R E P O R T National Aeronautics and Space Administration  

E-Print Network [OSTI]

Stardust's sample return capsule made a flawless landing in the Utah desert, bringing home samples, studying our own world, other planets, comets and the deeper universe. All of these achievements were

Waliser, Duane E.

347

THE ACCELERATING JET OF 3C 279  

SciTech Connect (OSTI)

Analysis of the proper motions of the subparsec scale jet of the quasar 3C 279 at 15 GHz with the Very Long Baseline Array shows significant accelerations in four of nine superluminal features. Analysis of these motions is combined with the analysis of flux density light curves to constrain values of Lorentz factor and viewing angle (and their derivatives) for each component. The data for each of these components are consistent with significant changes to the Lorentz factor, viewing angle, and azimuthal angle, suggesting jet bending with changes in speed. We see that for these observed components Lorentz factors are in the range {Gamma} = 10-41, viewing angles are in the range thetav = 0. Degree-Sign 1-5. Degree-Sign 0, and intrinsic (source frame) flux density is in the range, F{sub {nu},int} 1.5 Multiplication-Sign 10{sup -9}-1.5 Multiplication-Sign 10{sup -5} Jy. Considering individual components, the Lorentz factors vary from {Gamma} = 11-16 for C1, {Gamma} = 31-41 for C5, {Gamma} = 29-41 for C6, and {Gamma} = 9-12 for C8, indicating that there is no single underlying flow speed to the jet and likely we are seeing pattern speeds from shocks in the jet. The viewing angles vary in time from 0. Degree-Sign 6 to 1. Degree-Sign 5 in the case of C1 (the least extreme example), from 0. Degree-Sign 5 to 5. Degree-Sign 0 in the case of C8, and from 0. Degree-Sign 1 to 0. Degree-Sign 9 for C5 (the last two being the most extreme examples). The intrinsic flux density varies by factors from 1.4 for C8 and 430 for C5. Theoretical analysis of the accelerations also indicates potential jet bending. In addition, for one component, C5, polarization measurements also set limits to the trajectory of the jet.

Bloom, S. D. [Department of Physics and Astronomy, Hampden-Sydney College, Box 821, Hampden-Sydney, VA 23943 (United States); Fromm, C. M.; Ros, E., E-mail: sbloom@hsc.edu [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany)

2013-01-01T23:59:59.000Z

348

On the influence that the ground electrode diameter has in the propulsion efficiency of an asymmetric capacitor in nitrogen gas  

SciTech Connect (OSTI)

In this work, the propulsion force developed in an asymmetric capacitor will be calculated for three different diameters of the ground electrode. The used ion source is a small diameter wire, which generates a positive corona discharge in nitrogen gas directed to the ground electrode. By applying the fluid dynamic and electrostatic theories, all hydrodynamic and electrostatic forces that act on the considered geometries will be computed in an attempt to provide a physical insight on the force mechanism that acts on the asymmetrical capacitors, and also to understand how to increase the efficiency of propulsion.

Martins, Alexandre A. [Institute for Plasmas and Nuclear Fusion, Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisboa (Portugal); Pinheiro, Mario J. [Department of Physics and Institute for Plasmas and Nuclear Fusion, Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisboa (Portugal)

2011-03-15T23:59:59.000Z

349

Condition monitoring requirements for the development of a space nuclear propulsion module  

SciTech Connect (OSTI)

To facilitate the development of a space nuclear propulsion module for manned flights to Mars, requirements must be established early in the technology cycle. The long lead times for the acquisition of the engine system and nuclear test facilities demands that the engine system, size, performance, safety goals and condition monitoring philosophy be defined at the earliest possible time. These systems are highly complex and require a large multi-disciplinary systems engineering team to develop and track the requirements and to ensure that the as-built system reflects the intent of the mission. An effective methodology has been devised coupled with sophisticated computer tools to effectivly develop and interpret the functional requirements. These requirements can then be decomposed down to the specification level for implementation. This paper discusses the application of the methodology and the analyses to develop condition monitoring requirements under a contract with the National Aeronautics and Space Administration (NASA) Lewis Research Center (LeRC) Nuclear Propulsion Office (NPO).

Wagner, R.C.

1993-12-31T23:59:59.000Z

350

System for propulsion of boats by means of winds and streams and for recovery of energy  

SciTech Connect (OSTI)

The invention relates to an improved system for propulsion of boats by winds and streams and for recovery of disposable energy from floating stations neither moored nor anchored, the improved system comprising: at least one aerial feathered propeller with its shaft, the propeller being mounted orientable in any azimuth direction contained in a substantially horizontal plane and adapted to function as an aerogenerator as well as a propulsive screw; a superstructure supporting device on the floating unit adapted to permit orientation as desired of the aerial propeller in the direction of the wind; at least one nautic propeller screw with its shaft, mounted under the bottom of the floating unit and adapted to be capable of functioning as energy collecting turbine as well as propeller; a transmission system connecting the aerial propeller shaft to the nautic propeller shaft, the transmission being reversible and capable of including a torque conversion device to select during operations the direction of transmission as well as the transmission ratio; a directional device adapted to ensure the steering of the floating unit; and control devices comprising actuating apparatus adapted to allow the driver to act, in addition upon the directional device and the azimuth orientation of said aerial propeller, upon at least two of three variable parameters of said system, namely the pitch of said aerial propeller, the transmission ratio and the pitch of said nautic propeller, by the actuating apparatus.

Vidal, J.

1983-02-01T23:59:59.000Z

351

New Opportunities for Outer Solar System Science using Radioisotope Electric Propulsion  

SciTech Connect (OSTI)

Today, our questions and hypotheses about the Solar System's origin have surpassed our ability to deliver scientific instruments to deep space. The moons of the outer planets, the Trojan and Centaur minor planets, the trans-Neptunian objects (TNO), and distant Kuiper Belt objects (KBO) hold a wealth of information about the primordial conditions that led to the formation of our Solar System. Robotic missions to these objects are needed to make the discoveries, but the lack of deep-space propulsion is impeding this science. Radioisotope electric propulsion (REP) will revolutionize the way we do deep-space planetary science with robotic vehicles, giving them unprecedented mobility. Radioisotope electric generators and lightweight ion thrusters are being developed today which will make possible REP systems with specific power in the range of 5 to 10 W/kg. Studies have shown that this specific power range is sufficient to perform fast rendezvous missions from Earth to the outer Solar System and fast sample return missions. This whitepaper discusses how mobility provided by REP opens up entirely new science opportunities for robotic missions to distant primitive bodies. We also give an overview of REP technology developments and the required next steps to realize REP.

Noble, Robert J.; /SLAC; Amini, Rashied; Beauchamp, Patricia M.; /Caltech, JPL; Bennett, Gary L.; /Metaspace Enterprises; Brophy, John R.; Buratti, Bonnie J.; Ervin, Joan; /Caltech, JPL; Fernandez, Yan R.; /Central Florida U.; Grundy, Will; /Lowell Observ.; Khan, Mohammed Omair; /Caltech, JPL; King, David Q.; /Aerojet; Lang, Jared; /Caltech, JPL; Meech, Karen J.; /Hawaii U.; Newhouse, Alan; Oleson, Steven R.; Schmidt, George R.; /GRC; Spilker, Thomas; West, John L.; /Caltech, JPL; ,

2010-05-26T23:59:59.000Z

352

Heavy vehicle propulsion system materials program semiannual progress report for April 1998 thru September 1998  

SciTech Connect (OSTI)

The purpose of the Heavy Vehicle Propulsion System Materials Program is the development of materials: ceramics, intermetallics, metal alloys, and metal and ceramic coatings, to support the dieselization of class 1--3 trucks to realize a 35{percent} fuel-economy improvement over current gasoline-fueled trucks and to support commercialization of fuel-flexible LE-55 low-emissions, high-efficiency diesel engines for class 7--8 trucks. The Office of Transportation Technologies, Office of Heavy Vehicle Technologies (OTT OHVT) has an active program to develop the technology for advanced LE-55 diesel engines with 55{percent} efficiency and low emissions levels of 2.0 g/bhp-h NO{sub x} and 0.05 g/bhp-h particulates. The goal is also for the LE-55 engine to run on natural gas with efficiency approaching that of diesel fuel. The LE-55 program is being completed in FY 1997 and, after approximately 10 years of effort, has largely met the program goals of 55{percent} efficiency and low emissions. However, the commercialization of the LE-55 technology requires more durable materials than those that have been used to demonstrate the goals. Heavy Vehicle Propulsion System Materials will, in concert with the heavy-duty diesel engine companies, develop the durable materials required to commercialize the LE-55 technologies.

Johnson, D.R.

1999-01-01T23:59:59.000Z

353

Hydrogen loops in existing reactors for testing fuel elements for nuclear propulsion  

Science Journals Connector (OSTI)

The Space Exploration Initiative (SEI) has revitalized interest in adapting nuclear energy for power and propulsion. Prior to the selection of a nuclear thermal propulsion (NTP) system extensive testing of the various proposed concepts will be required. In today’s environmental safety and health culture full size rocket engine tests as were done under the Rover/NERVA program will be extremely difficult and expensive to perform and meet NASA’s schedules. A different test strategy uses a hydrogen loop in an existing reactor to test a wide variety of single elements or clusters of elements for fuel qualification. This approach is expected to reduce operating and capital costs and expedite the testing schedule. This paper examines the potential of performing subscale tests in a hydrogen loop in an existing reactor such as the Advanced Test Reactor (ATR) at the Idaho National Engineering Laboratory or the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory. The HFIR is expected to achieve power densities comparable to those achieved in ATR because of the 85 MWt power level and the high thermal and fast flux levels. The available length and diameter of the test region of FHIR are 60 cm and 10 cm whereas the available length and diameter of the test region of ATR are 120 cm and 12 cm respectively.

Charles S. Olsen; Henry Welland; James Abraschoff; Kenneth Thoms

1993-01-01T23:59:59.000Z

354

Electric Propulsion  

Science Journals Connector (OSTI)

...weight, long life-time, and...elec-trically conducting gas; and (iii...but neutral gas, are not subject...systems the turbine extracts from...operation, the remaining fraction of...radiate away the remaining heat, the size...power of the turbine-out-let...if it is a gas, it must be...

W. E. Moeckel

1963-10-11T23:59:59.000Z

355

Propulsion Materials  

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

balls. The alcohol-powder slurry was poured through a 90-mm sieve to separate the milling media from the powder-alcohol slurry, which was then captured in a stainless steel tray....

356

Experimental study of elliptical jet from sub to supercritical conditions  

SciTech Connect (OSTI)

The jet mixing at supercritical conditions involves fluid dynamics as well as thermodynamic phenomena. All the jet mixing studies at critical conditions to the present date have focused only on axisymmetric jets. When the liquid jet is injected into supercritical environment, the thermodynamic transition could be well understood by considering one of the important fluid properties such as surface tension since it decides the existence of distinct boundary between the liquid and gaseous phase. It is well known that an elliptical liquid jet undergoes axis-switching phenomena under atmospheric conditions due to the presence of surface tension. The experimental investigations were carried out with low speed elliptical jet under supercritical condition. Investigation of the binary component system with fluoroketone jet and N{sub 2} gas as environment shows that the surface tension force dominates for a large downstream distance, indicating delayed thermodynamic transition. The increase in pressure to critical state at supercritical temperature is found to expedite the thermodynamic transition. The ligament like structures has been observed rather than droplets for supercritical pressures. However, for the single component system with fluoroketone jet and fluoroketone environment shows that the jet disintegrates into droplets as it is subjected to the chamber conditions even for the subcritical pressures and no axis switching phenomenon is observed. For a single component system, as the pressure is increased to critical state, the liquid jet exhibits gas-gas like mixing behavior and that too without exhibiting axis-switching behavior.

Muthukumaran, C. K.; Vaidyanathan, Aravind, E-mail: aravind7@iist.ac.in [Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Trivandrum, Kerala 695547 (India)] [Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Trivandrum, Kerala 695547 (India)

2014-04-15T23:59:59.000Z

357

Jet momentum balance independent of shear viscosity  

E-Print Network [OSTI]

Jet momentum balance measurements, such as those recently performed by the CMS collaboration, provide an opportunity to quantify the energy transferred from a parton shower to the underlying medium in heavy-ion collisions. Specifically, I argue that the Cooper-Frye freezeout distribution associated with the energy and momentum deposited by the parton shower is controlled to a significant extent by the distribution of the underlying bulk matter and independent of the details of how deposited energy is redistributed in the medium, which is largely determined by transport coefficients such as shear viscosity. Thus by matching the distribution of momentum associated with the secondary jet in such measurements to the thermal distribution of the underlying medium, one can obtain a model independent estimate on the amount of parton shower energy deposited.

R. B. Neufeld

2011-08-31T23:59:59.000Z

358

Cryogenic target formation using cold gas jets  

DOE Patents [OSTI]

A method and apparatus using cold gas jets for producing a substantially uniform layer of cryogenic materials on the inner surface of hollow spherical members having one or more layers, such as inertially imploded targets. By vaporizing and quickly refreezing cryogenic materials contained within a hollow spherical member, a uniform layer of the materials is formed on an inner surface of the spherical member. Basically the method involves directing cold gas jets onto a spherical member having one or more layers or shells and containing the cryogenic material, such as a deuterium-tritium (DT) mixture, to freeze the contained material, momentarily heating the spherical member so as to vaporize the contained material, and quickly refreezing the thus vaporized material forming a uniform layer of cryogenic material on an inner surface of the spherical member.

Hendricks, Charles D. (Livermore, CA)

1981-01-01T23:59:59.000Z

359

Phenomenology of Gamma-Ray Jets  

E-Print Network [OSTI]

We discuss some phenomenological aspects of $\\gamma$-ray emitting jets. In particular, we present calculations of the $\\gamma$-sphere and $\\pi$-sphere for various target photon fields, and employ them to demonstrate how $\\gamma$-ray observations at very high energies can be used to constraint the Doppler factor of the emitting plasma and the production of VHE neutrinos. We also consider the implications of the rapid TeV variability observed in M87 and the TeV blazars, and propose a model for the very rapid TeV flares observed with HESS and MAGIC in some blazars,that accommodates the relatively small Doppler factors inferred from radio observations. Finally, we briefly discuss the prospects for detecting VHE neutrinos from relativistic jets.

Amir Levinson

2007-09-10T23:59:59.000Z

360

Cross hedging jet-fuel price exposure  

Science Journals Connector (OSTI)

This paper investigates the cross hedging performance of several oil forwards contracts using WTI, Brent, gasoil and heating oil to manage jet-fuel spot price exposure. We apply three econometric techniques that have been widely tested and applied in the cross hedging literature on foreign exchange and stock index futures markets. Using quotes from the financial industry on forward contracts, we can show that the optimal cross hedging instrument depends on the maturity of the instrument's forwards contract. The results highlight that the standard approach in the literature to use crude oil as a cross hedge is not optimal for time horizons of three months or less. By contrast, for short hedging horizons our results indicate that gasoil forwards contracts represent the highest cross hedging efficiency for jet-fuel spot price exposure, while for maturities of more than three months, the predominance of gasoil diminishes in comparison to WTI and Brent.

Zeno Adams; Mathias Gerner

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Dense, vertical jet in stagnant homogeneous fluid  

E-Print Network [OSTI]

30. 4 53. 2 76. 0 21. 5 37. 6 53. 7 17. 5 30. 7 41. 6 3. 1 5. 4 7. 7 G. l 10. 0 15. 4 9. 2 16. 1 21. 9 0. 16 0. 28 0. 40 0. 65 1. 13 l. 62 1. 46 2. 55 3 45 H/D 50. 0 50. 0 50. 0 25. 0 25. 0 25. 0 16. 7 16, 7 16. 7...) m D 120 80 1 m D d Jet Height(from the nozzle) Abraham Jet or nozzle diameter (slope = 1. 94) Riser height H/d 0 5 r liater depth(Tank depth) (slope 1 89) L4 ft. (1. 22 m. )] s 0 pe' H/d = 0. 333 I +Turner (slope = 1. 82) ~~ ~ (slope...

Vergara, Ignacio

2012-06-07T23:59:59.000Z

362

Azimuthal Jet Tomography at RHIC and LHC  

E-Print Network [OSTI]

A generic jet-energy loss model that is coupled to state-of-the-art hydrodynamic fields and interpolates between a wide class of running coupling pQCD-based and AdS/CFT-inspired models is compared to recent data on the azimuthal and transverse momentum dependence of high-pT pion nuclear modification factors and high-pT elliptic flow measured at RHIC and LHC. We find that RHIC data are surprisingly consistent with various scenarios considered. However, extrapolations to LHC energies favor running coupling pQCD-based models of jet-energy loss. While conformal holographic models are shown to be inconsistent with data, recent non-conformal generalizations of AdS holography may provide an alternative description.

Barbara Betz; Miklos Gyulassy

2014-02-14T23:59:59.000Z

363

Cryogenic target formation using cold gas jets  

DOE Patents [OSTI]

A method and apparatus using cold gas jets for producing a substantially uniform layer of cryogenic materials on the inner surface of hollow spherical members having one or more layers, such as inertially imploded targets are disclosed. By vaporizing and quickly refreezing cryogenic materials contained within a hollow spherical member, a uniform layer of the materials is formed on an inner surface of the spherical member. Basically the method involves directing cold gas jets onto a spherical member having one or more layers or shells and containing the cryogenic material, such as a deuterium-tritium (DT) mixture, to freeze the contained material, momentarily heating the spherical member so as to vaporize the contained material, and quickly refreezing the thus vaporized material forming a uniform layer of cryogenic material on an inner surface of the spherical member. 4 figs.

Hendricks, C.D.

1980-02-26T23:59:59.000Z

364

Cryogenic target formation using cold gas jets  

DOE Patents [OSTI]

A method and apparatus using cold gas jets for producing a substantially uniform layer of cryogenic materials on the inner surface of hollow spherical members having one or more layers, such as inertially imploded targets. By vaporizing and quickly refreezing cryogenic materials contained within a hollow spherical member, a uniform layer of the materials is formed on an inner surface of the spherical member. Basically the method involves directing cold gas jets onto a spherical member having one or more layers or shells and containing the cryogenic material, such as a deuterium-tritium (DT) mixture, to freeze the contained material, momentarily heating the spherical member so as to vaporize the contained material, and quickly refreezing the thus vaporized material forming a uniform layer of cryogenic material on an inner surface of the spherical member.

Hendricks, Charles D. [Livermore, CA

1980-02-26T23:59:59.000Z

365

Thomson scattering measurements in atmospheric plasma jets  

Science Journals Connector (OSTI)

Electron temperature and electron density in a dc plasma jet at atmospheric pressure have been obtained using Thomson laser scattering. Measurements performed at various scattering angles have revealed effects that are not accounted for by the standard scattering theory. Differences between the predicted and experimental results suggest that higher order corrections to the theory may be required, and that corrections to the form of the spectral density function may play an important role.

G. Gregori; J. Schein; P. Schwendinger; U. Kortshagen; J. Heberlein; E. Pfender

1999-02-01T23:59:59.000Z

366

NLO QCD Predictions for W+3 jets  

SciTech Connect (OSTI)

In this contribution we present results from the NLO computation of the production of a W boson in association with three jets in hadronic collisions. The results are obtained by combining two programs: BlackHat for the virtual one-loop matrix elements and Sherpa for the real-emission contributions. We present results for the Tevatron and the LHC, and address the issue of the choice of a common factorization and renormalization scale for this process.

Maitre, Daniel; /Durham U.; Berger, Carola F.; /MIT; Bern, Zvi; Febres Cordero, Fernando; Ita, Harald; Dixon, Lance J.; Forde, Darren; Gleisberg, Tanju; /UCLA /SLAC; Kosower, David; /Saclay, SPhT

2009-12-09T23:59:59.000Z

367

ON THE ORIGIN OF INTERGRANULAR JETS  

SciTech Connect (OSTI)

We observe that intergranular jets, originating in the intergranular space surrounding individual granules, tend to be associated with granular fragmentation, in particular, with the formation and evolution of a bright granular lane (BGL) within individual granules. The BGLs have recently been identified as vortex tubes by Steiner et al. We further discover the development of a well-defined bright grain located between the BGL and the dark intergranular lane to which it is connected. Signatures of a BGL may reach the lower chromosphere and can be detected in off-band H{alpha} images. Simulations also indicate that vortex tubes are frequently associated with small-scale magnetic fields. We speculate that the intergranular jets detected in the New Solar Telescope (NST) data may result from the interaction between the turbulent small-scale fields associated with the vortex tube and the larger-scale fields existing in the intergranular lanes. The intergranular jets are much smaller and weaker than all previously known jet-like events. At the same time, they appear much more numerous than the larger events, leading us to the speculation that the total energy release and mass transport by these tiny events may not be negligible in the energy and mass-flux balance near the temperature minimum atop the photosphere. The study is based on the photospheric TiO broadband (1.0 nm) filter data acquired with the 1.6 m NST operating at the Big Bear Solar Observatory. The data set also includes NST off-band H{alpha} images collected through a Zeiss Lyot filter with a passband of 0.025 nm.

Yurchyshyn, V. B.; Goode, P. R.; Abramenko, V. I. [Big Bear Solar Observatory, New Jersey Institute of Technology, Big Bear City, CA 92314 (United States); Steiner, O. [Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstrasse 6, D-79104 Freiburg (Germany)

2011-08-01T23:59:59.000Z

368

Sting jets in intense winter North-Atlantic windstorms  

Science Journals Connector (OSTI)

Extratropical cyclones dominate autumn and winter weather over western Europe. The strongest cyclones, often termed windstorms, have a large socio-economic impact due to the strong surface winds and associated storm surges in coastal areas. Here we show that sting jets are a common feature of windstorms; up to a third of the 100 most intense North-Atlantic winter windstorms over the last two decades satisfy conditions for sting jets. The sting jet is a mesoscale descending airstream that can cause strong near-surface winds in the dry slot of the cyclone, a region not usually associated with strong winds. Despite their localized transient nature, these sting jets can cause significant damage, a prominent example being the storm that devastated southeast England on 16 October 1987. We present the first regional climatology of windstorms with sting jets. Previously analysed sting-jet cases appear to have been exceptional in their track over northwest Europe rather than in their strength.

Oscar Martínez-Alvarado; Suzanne L Gray; Jennifer L Catto; Peter A Clark

2012-01-01T23:59:59.000Z

369

Polarization and energy content of parsec scale AGN jets  

E-Print Network [OSTI]

Most of energy carried by relativistic AGN jets remains undetected until hundreds of kiloparsecs where interaction with intergalactic medium produces hot spots. The jet's hidden energy is only partially dissipated at smaller scales, from parsecs to kiloparsecs. Several media may play the role of the ``prime mover'': ions, pairs or large scale magnetic fields. Analyzing VLBI polarization structures of relativistic parsec scale jets we conclude that large-scale magnetic fields can explain the salient polarization properties of parsec-scale AGN jets. This implies that large-scale magnetic fields carry a non-negligible fraction of jet luminosity. We also discuss the possibility that relativistic AGN jets may be electromagnetically (Poynting flux) dominated. In this case, dissipation of the toroidal magnetic field (and not fluid shocks) may be responsible for particle acceleration.

Maxim Lyutikov; Vladimir I. Pariev; Denise C. Gabuzda

2004-11-15T23:59:59.000Z

370

Jet conversions in a quark-gluon plasma  

Science Journals Connector (OSTI)

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic q(q¯)g?gq(q¯) and the inelastic qq¯?gg scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net of quark jets to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the p/?+ and p¯/?- ratios at high transverse momentum. However, a much larger net quark-to-gluon jet conversion rate than the one given by the lowest order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at the same energy. Implications of our results are discussed.

W. Liu; C. M. Ko; B. W. Zhang

2007-05-04T23:59:59.000Z

371

Studies of Relativistic Jets in Active Galactic Nuclei with SKA  

E-Print Network [OSTI]

Relativistic jets in active galactic nuclei (AGN) are among the most powerful astrophysical objects discovered to date. Indeed, jetted AGN studies have been considered a prominent science case for SKA, and were included in several different chapters of the previous SKA Science Book (Carilli & Rawlings 2004). Most of the fundamental questions about the physics of relativistic jets still remain unanswered, and await high-sensitivity radio instruments such as SKA to solve them. These questions will be addressed specially through analysis of the massive data sets arising from the deep, all-sky surveys (both total and polarimetric flux) from SKA1. Wide-field very-long-baseline-interferometric survey observations involving SKA1 will serve as a unique tool for distinguishing between extragalactic relativistic jets and star forming galaxies via brightness temperature measurements. Subsequent SKA1 studies of relativistic jets at different resolutions will allow for unprecedented cosmological studies of AGN jets up...

Agudo, Ivan; Falcke, Heino; Georganopoulos, Markos; Ghisellini, Gabriele; Giovannini, Gabriele; Giroletti, Marcello; Gomez, Jose L; Gurvits, Leonid; Laing, Robert; Lister, Matthew; Marti, Jose-Maria; Meyer, Eileen T; Mizuno, Yosuke; O'Sullivan, Shane; Padovani, Paolo; Paragi, Zsolt; Perucho, Manel; Schleicher, Dominik; Stawarz, Lukasz; Vlahakis, Nektarios; Wardle, John

2015-01-01T23:59:59.000Z

372

MEASURING THE JET POWER OF FLAT-SPECTRUM RADIO QUASARS  

SciTech Connect (OSTI)

We use frequency-dependent position shifts of flat-spectrum radio cores to estimate the kinetic power of active galactic nucleus (AGN) jets. We find a correlation between the derived jet powers and AGN narrow-line luminosity, consistent with the well-known relation for radio galaxies and steep spectrum quasars. This technique can be applied to intrinsically weak jets even at high redshift.

Shabala, S. S.; Santoso, J. S. [School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001 (Australia); Godfrey, L. E. H. [International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia)

2012-09-10T23:59:59.000Z

373

A PRECESSING JET IN THE CH Cyg SYMBIOTIC SYSTEM  

SciTech Connect (OSTI)

Jets have been detected in only a few symbiotic binaries to date, and CH Cyg is one of them. In 2001, a non-relativistic jet was detected in CH Cyg for the first time in X-rays. We carried out coordinated Chandra, Hubble Space Telescope (HST), and VLA observations in 2008 to study the propagation of this jet and its interaction with the circumbinary medium. We detected the jet with Chandra and HST and determined that the apex has expanded to the south from {approx}300 AU to {approx}1400 AU, with the shock front propagating with velocity <100 km s{sup -1}. The shock front has significantly slowed down since 2001. Unexpectedly, we also discovered a powerful jet in the NE-SW direction, in the X-ray, optical and radio. This jet has a multi-component structure, including an inner jet and a counterjet at {approx}170 AU, and a SW component ending in several clumps extending out to {approx}750 AU. The structure of the jet and the curvature of the outer portion of the SW jet suggest an episodically powered precessing jet or a continuous precessing jet with occasional mass ejections or pulses. We carried out detailed spatial mapping of the X-ray emission and correlation with the optical and radio emission. X-ray spectra were extracted from the central source, inner NE counterjet, and the brightest clump at a distance of {approx}500 AU from the central source. We discuss the initial results of our analyses, including the multi-component spectral fitting of the jet components and of the central source.

Karovska, Margarita; Gaetz, Terrance J.; Raymond, John C.; Lee, Nicholas P. [Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138 (United States); Carilli, Christopher L. [National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801 (United States); Hack, Warren [Space Telescope Science Institute, Baltimore, MD 21218-2463 (United States)], E-mail: mkarovska@cfa.harvard.edu

2010-02-20T23:59:59.000Z

374

Multi-star multi-phase winding for a high power naval propulsion machine with low ripple torques  

E-Print Network [OSTI]

Permanent Magnet (SMPM) Machine designed for naval propulsion is proposed. The design objective of this high if the magnetic couplings between the stars is weak. The 4-star 3-phase winding proposed in this paper is designed star being magnetically shifted by an angle of 15 degrees. This 4-star 3-phase configuration allows

Boyer, Edmond

375

A Fuzzy-Based Strategy to Improve Control Reconfiguration Performance of a Sensor Fault-Tolerant Induction Motor Propulsion  

E-Print Network [OSTI]

recovery in the Electric (EV) or Hybrid Electric Vehicle (HEV) induction motor drive. To achieve this goal-ref · Fault Tolerant Controller HybridHybrid ElectricElectric VehicleVehicle Induction Motor Sensorless Fuzzy-Tolerant Induction Motor Propulsion Bekheira Tabbache1,2 , Mohamed Benbouzid1 , Abdelaziz Kheloui2 and Jean

Paris-Sud XI, Université de

376

The influence of solid ankle-foot-orthoses on forward propulsion and dynamic balance in healthy adults during walking  

E-Print Network [OSTI]

The influence of solid ankle-foot-orthoses on forward propulsion and dynamic balance in healthy-stroke hemiparetic subjects, solid polypropylene ankle-foot-orthoses are commonly prescribed to assist in foot clearance during swing while bracing the ankle during stance. Mobility demands, such as changing walking

377

Estimation of Quasi-Stiffness and Propulsive Work of the Human Ankle in the Stance Phase of Walking  

E-Print Network [OSTI]

Estimation of Quasi-Stiffness and Propulsive Work of the Human Ankle in the Stance Phase of Walking of human legs. This work aims to establish statistical models that allow us to predict the ankle quasi-stiffness and net mechanical work for adults walking on level ground. During the stance phase of walking, the ankle

Dollar, Aaron M.

378

Hydrocarbon-fueled internal combustion engines: "the worst form of vehicle propulsion... except for all the other forms"  

E-Print Network [OSTI]

Hydrocarbon-fueled internal combustion engines: "the worst form of vehicle propulsion... except of Southern California, Los Angeles, CA 90089-1453 Introduction Hydrocarbon-fueled internal combustion engines. For the purposes of this paper: An internal combustion engine is a heat engine (a device in which thermal energy

379

VOL. 6, NO. 5, SEPT.-OCT. 1990 J. PROPULSION 621 Stator/Rotor Interaction in a Transonic Turbine  

E-Print Network [OSTI]

on the rotor blade, reflects upstream, and then reflects again off the stator blade Presented as Paper 88 and shows the large unsteadiness in the lift on the rotor blade. Basic NumericalMethod The flowfiVOL. 6, NO. 5, SEPT.-OCT. 1990 J. PROPULSION 621 Stator/Rotor Interaction in a Transonic Turbine

Giles, Mike

380

Ultra-precision figuring using submerged jet polishing  

Science Journals Connector (OSTI)

A new removal optimization method called submerged jet polishing (SJP) is reported. Experiments are conducted to obtain the removal shape. Results of SJP ...

Shi, Chunyan; Yuan, Jiahu; Wu, Fan; Wan, Yongjian

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Environmental and economic assessment of microalgae-derived jet fuel  

E-Print Network [OSTI]

Significant efforts must be undertaken to quantitatively assess various alternative jet fuel pathways when working towards achieving environmental and economic United States commercial and military alternative aviation ...

Carter, Nicholas Aaron

2012-01-01T23:59:59.000Z

382

COLLIMATION AND CONFINEMENT OF MAGNETIC JETS BY EXTERNAL MEDIA  

SciTech Connect (OSTI)

We study the collimation of a highly magnetized jet by a surrounding cocoon that forms as a result of the interaction of the jet with the external medium. We show that in regions where the jet is well confined by the cocoon, current-driven instabilities should develop over timescales shorter than the expansion time of the jet's head. We speculate that these instabilities would give rise to complete magnetic field destruction, whereby the jet undergoes a transition from high to low sigma above the collimation zone. Using this assumption, we construct a self-consistent model for the evolution of the jet-cocoon system in an ambient medium of arbitrary density profile. We apply the model to jet breakout in long gamma-ray bursts (GRBs) and show that the jet is highly collimated inside the envelope of the progenitor star and is likely to remain confined well after breakout. We speculate that this strong confinement may provide a channel for magnetic field conversion in GRB outflows, whereby the hot, low-sigma jet section thereby produced is the source of the photospheric emission observed in many bursts.

Levinson, Amir [School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978 (Israel)] [School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978 (Israel); Begelman, Mitchell C., E-mail: Levinson@wise.tau.ac.il, E-mail: mitch@jila.colorado.edu [JILA, University of Colorado and National Institute of Standards and Technology, 440 UCB, Boulder, CO 80309-0440 (United States)

2013-02-20T23:59:59.000Z

383

Intense and Highly Energetic Atmospheric Pressure Plasma Jet Arrays.  

E-Print Network [OSTI]

??This thesis documents the efforts taken to produce highly ionized and concentrated atmospheric pressure plasma using an arrayed atmospheric pressure plasma jet (APPJ) system. The… (more)

Furmanski, John

2012-01-01T23:59:59.000Z

384

An experimental study of jet impingement on a circular cylinder  

E-Print Network [OSTI]

diameter of 6 5/8 inches. The jet was impinged upon the cylinder at nozzle distances of 7, 15, and 30 nozzle diameters, and at velocities of' 400 and 500 ft/s. The free jet was studied and found to be "typical" by comparing it to earlier studies done... Instrumentation schematic 17 5 Cylindrical suriace coordinate system 22 6 Photograph of the cylinder with "grid" 23 7 Photograph of the wall jet traversing apparatus 24 8 Orientation of the hot film sensor 25 9 Free jet geometry and parameters 30 10 Velocity...

Potts, Dennis Wayne

2012-06-07T23:59:59.000Z

385

Inclusive-jet photoproduction at HERA and determination of alphas  

E-Print Network [OSTI]

Inclusive-jet cross sections have been measured in the reaction ep->e+jet+X for photon virtuality Q2 energies in the region 142 energy, ETjet, and pseudorapidity, etajet, for jets with ETjet > 17 GeV and -1 energy-scale dependence of the coupling was determined. The value of alphas(Mz) extracted from the measurements based on the kT jet algorithm is alphas(Mz) = 0.1206 +0.0023 -0.0022 (exp.) +0.0042 -0.0035 (th.); the results from the anti-kT and SIScone algorithms are compatible with this value and have a similar precision.

ZEUS Collaboration; H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; P. Antonioli; A. Antonov; M. Arneodo; V. Aushev; Y. Aushev; O. Bachynska; A. Bamberger; A. N. Barakbaev; G. Barbagli; G. Bari; F. Barreiro; N. Bartosik; D. Bartsch; M. Basile; O. Behnke; J. Behr; U. Behrens; L. Bellagamba; A. Bertolin; S. Bhadra; M. Bindi; C. Blohm; V. Bokhonov; T. Bold; K. Bondarenko; E. G. Boos; K. Borras; D. Boscherini; D. Bot; I. Brock; E. Brownson; R. Brugnera; N. Brummer; A. Bruni; G. Bruni; B. Brzozowska; P. J. Bussey; B. Bylsma; A. Caldwell; M. Capua; R. Carlin; C. D. Catterall; S. Chekanov; J. Chwastowski; J. Ciborowski; R. Ciesielski; L. Cifarelli; F. Cindolo; A. Contin; A. M. Cooper-Sarkar; N. Coppola; M. Corradi; F. Corriveau; M. Costa; G. D'Agostini; F. Dal Corso; J. del Peso; R. K. Dementiev; S. De Pasquale; M. Derrick; R. C. E. Devenish; D. Dobur; B. A. Dolgoshein; G. Dolinska; A. T. Doyle; V. Drugakov; L. S. Durkin; S. Dusini; Y. Eisenberg; P. F. Ermolov; A. Eskreys; S. Fang; S. Fazio; J. Ferrando; M. I. Ferrero; J. Figiel; M. Forrest; B. Foster; G. Gach; A. Galas; E. Gallo; A. Garfagnini; A. Geiser; I. Gialas; A. Gizhko; L. K. Gladilin; D. Gladkov; C. Glasman; O. Gogota; Yu. A. Golubkov; P. Gottlicher; I. Grabowska-Bold; J. Grebenyuk; I. Gregor; G. Grigorescu; G. Grzelak; O. Gueta; M. Guzik; C. Gwenlan; T. Haas; W. Hain; R. Hamatsu; J. C. Hart; H. Hartmann; G. Hartner; E. Hilger; D. Hochman; R. Hori; K. Horton; A. Huttmann; Z. A. Ibrahim; Y. Iga; R. Ingbir; M. Ishitsuka; H. -P. Jakob; F. Januschek; T. W. Jones; M. Jungst; I. Kadenko; B. Kahle; S. Kananov; T. Kanno; U. Karshon; F. Karstens; I. I. Katkov; M. Kaur; P. Kaur; A. Keramidas; L. A. Khein; J. Y. Kim; D. Kisielewska; S. Kitamura; R. Klanner; U. Klein; E. Koffeman; N. Kondrashova; O. Kononeko; P. Kooijman; Ie. Korol; I. A. Korzhavina; A. Kotanski; U. Kotz; H. Kowalski; O. Kuprash; M. Kuze; A. Lee; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; T. Y. Ling; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Lohr; E. Lohrmann; K. R. Long; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; J. Maeda; S. Magill; I. Makarenko; J. Malka; R. Mankel; A. Margotti; G. Marini; J. F. Martin; A. Mastroberardino; M. C. K. Mattingly; I. -A. Melzer-Pellmann; S. Mergelmeyer; S. Miglioranzi; F. Mohamad Idris; V. Monaco; A. Montanari; J. D. Morris; K. Mujkic; B. Musgrave; K. Nagano; T. Namsoo; R. Nania; A. Nigro; Y. Ning; T. Nobe; U. Noor; D. Notz; R. J. Nowak; A. E. Nuncio-Quiroz; B. Y. Oh; N. Okazaki; K. Oliver; K. Olkiewicz; Yu. Onishchuk; K. Papageorgiu; A. Parenti; E. Paul; J. M. Pawlak; B. Pawlik; P. G. Pelfer; A. Pellegrino; W. Perlanski; H. Perrey; K. Piotrzkowski; P. Plucinski; N. S. Pokrovskiy; A. Polini; A. S. Proskuryakov; M. Przybycien; A. Raval; D. D. Reeder; B. Reisert; Z. Ren; J. Repond; Y. D. Ri; A. Robertson; P. Roloff; I. Rubinsky; M. Ruspa; R. Sacchi; U. Samson; G. Sartorelli; A. A. Savin; D. H. Saxon; M. Schioppa; S. Schlenstedt; P. Schleper; W. B. Schmidke; U. Schneekloth; V. Schonberg; T. Schorner-Sadenius; J. Schwartz; F. Sciulli; L. M. Shcheglova; R. Shehzadi; S. Shimizu; I. Singh; I. O. Skillicorn; W. Slominski; W. H. Smith; V. Sola; A. Solano; D. Son; V. Sosnovtsev; A. Spiridonov; H. Stadie; L. Stanco; N. Stefaniuk; A. Stern; T. P. Stewart; A. Stifutkin; P. Stopa; S. Suchkov; G. Susinno; L. Suszycki; J. Sztuk-Dambietz; D. Szuba; J. Szuba; A. D. Tapper; E. Tassi; J. Terron; T. Theedt; H. Tiecke; K. Tokushuku; J. Tomaszewska; V. Trusov; T. Tsurugai; M. Turcato; O. Turkot; T. Tymieniecka; M. Vazquez; A. Verbytskyi; O. Viazlo; N. N. Vlasov; R. Walczak; W. A. T. Wan Abdullah; J. J. Whitmore; L. Wiggers; M. Wing; M. Wlasenko; G. Wolf; H. Wolfe; K. Wrona; A. G. Yagues-Molina; S. Yamada; Y. Yamazaki; R. Yoshida; C. Youngman; O. Zabiegalov; A. F. Zarnecki; L. Zawiejski; O. Zenaiev; W. Zeuner; B. O. Zhautykov; N. Zhmak; C. Zhou; A. Zichichi; Z. Zolkapli; D. S. Zotkin

2012-05-28T23:59:59.000Z

386

On the interaction of microquasar jets with stellar winds  

E-Print Network [OSTI]

Strong interactions between jets and stellar winds at binary system spatial scales could occur in high-mass microquasars. We study here, mainly from a dynamical but also a radiative point of view, the collision between a dense stellar wind and a mildly relativistic hydrodynamical jet of supersonic nature.}{We have performed numerical 2-dimensional simulations of jets, with cylindrical and planar (slab) symmetry, crossing the stellar wind material. From the results of the simulations, we derive estimates of the particle acceleration efficiency, using first order Fermi acceleration theory, and give some insight on the possible radiative outcomes. We find that, during jet launching, the jet head generates a strong shock in the wind. During and after this process, strong recollimation shocks can occur due to the initial overpressure of the jet with its environment. The conditions in all these shocks are convenient to accelerate particles up to $\\sim$ TeV energies, which can lead to leptonic (synchrotron and inverse Compton) and hadronic (proton-proton) radiation. In principle, the cylindrical jet simulations show that the jet is stable, and can escape from the system even for relatively low power. However, when accounting for the wind ram pressure, the jet can be bent and disrupted for power $\\la 10^{36}$ erg s$^{-1}$.

M. Perucho; V. Bosch-Ramon

2008-02-08T23:59:59.000Z

387

An alternative model of jet suppression at RHIC energies  

E-Print Network [OSTI]

We propose a simple Glauber-type mechanism for suppression of jet production up to transverse momenta of about 10 GeV/c at RHIC. For processes in this kinematic region, the formation time is smaller than the interval between two successive hard partonic collisions and the subsequent collision influences the jet production. Number of jets then roughly scales with the number of participants. Proportionality to the number of binary collisions is recovered for very high transverse momenta. The model predicts suppression of jet production in d+Au collisions at RHIC.

Roman Lietava; Jan Pisut; Neva Pisutova; Boris Tomasik

2003-02-10T23:59:59.000Z

388

Geographic Area Month Aviation Gasoline Kerosene-Type Jet Fuel  

Gasoline and Diesel Fuel Update (EIA)

State (Cents per Gallon Excluding Taxes) - Continued Geographic Area Month Aviation Gasoline Kerosene-Type Jet Fuel Kerosene Sales to End Users Sales for Resale Sales to End...

389

Generation and Propagation of Inertia Gravity Waves from Vortex Dipoles and Jets Shuguang Wang  

E-Print Network [OSTI]

Generation and Propagation of Inertia Gravity Waves from Vortex Dipoles and Jets Shuguang Wang generation and propagation from jets within idealized vortex dipoles using a nonhydrostatic mesoscale model, moist convection, fronts, upper level jets, geostrophic adjustment and spontaneous generation (Fritts

390

Spot Size Limited Carbon Propellant Characterization for Efficient High Isp Laser Propulsion  

SciTech Connect (OSTI)

Laser propulsion has very unique advantage of producing exhausting gas (ions) of very high velocity. Specific impulse from laser plasma could easily exceed 10,000 seconds that reduce the current propellant consumption rate on space born thrusters significantly. For efficient propellant usage, it is desirable that the exhaust plasma has rather narrow velocity distribution of fast ions. In order to accomplish the requirements, thermal conduction and neutral particle losses at and vicinity of the laser heated region have to be eliminated. A concept of spot size limited propellant shape has been proposed and tested in terms of the effects of the loss reduction. Ion and neutral particle measurements from laser plasmas produced on the above mentioned carbon targets are used to characterize the performance of the propellant.

Uchida, Shigeaki; Shimada, Yoshinori; Hashimoto, Kazuhisa; Yamaura, Michiteru [Institute for Laser Technology, Osaka (Japan); Birou, Tomoya; Yoshida, Minoru [Kinki University, Osaka (Japan)

2005-04-27T23:59:59.000Z

391

Test of relativistic gravity for propulsion at the Large Hadron Collider  

E-Print Network [OSTI]

A design is presented of a laboratory experiment that could test the suitability of relativistic gravity for propulsion of spacecraft to relativistic speeds. An exact time-dependent solution of Einstein's gravitational field equation confirms that even the weak field of a mass moving at relativistic speeds could serve as a driver to accelerate a much lighter payload from rest to a good fraction of the speed of light. The time-dependent field of ultrarelativistic particles in a collider ring is calculated. An experiment is proposed as the first test of the predictions of general relativity in the ultrarelativistic limit by measuring the repulsive gravitational field of bunches of protons in the Large Hadron Collider (LHC). The estimated 'antigravity beam' signal strength at a resonant detector of each proton bunch is 3 nm/s^2 for 2 ns during each revolution of the LHC. This experiment can be performed off-line, without interfering with the normal operations of the LHC.

Franklin Felber

2009-10-06T23:59:59.000Z

392

The Anomalous Merging of the African and North Atlantic Jet Streams during the Northern Hemisphere Winter of 2010  

Science Journals Connector (OSTI)

The North Atlantic jet stream during winter 2010 was unusually zonal, so the typically separated Atlantic and African jets were merged into one zonal jet. Moreover, the latitude–height structure and temporal variability of the North Atlantic jet ...

N. Harnik; E. Galanti; O. Martius; O. Adam

2014-10-01T23:59:59.000Z

393

E-Print Network 3.0 - atmospheric plasma jet Sample Search Results  

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

University Collection: Engineering 2 Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for Summary: Atmospheric Pressure Plasma Jet Treatment of Polyethylene...

394

Enabling High Efficiency Low Temperature Combustion by Adaptive In-Situ Jet Cooling  

Broader source: Energy.gov [DOE]

A new approach, called Adaptive-Jet-Cooling, leverages two distinct spray patters of hollow conical sprays and conventional multiple jets, eliminating key sources of NOx and PM.

395

Radiant Energy Power Source for Jet Aircraft  

SciTech Connect (OSTI)

This report beings with a historical overview on the origin and early beginnings of Radiant Energy Power Source for Jet Aircraft. The report reviews the work done in Phase I (Grant DE-FG01-82CE-15144) and then gives a discussion of Phase II (Grant DE-FG01-86CE-15301). Included is a reasonably detailed discussion of photovoltaic cells and the research and development needed in this area. The report closes with a historical perspective and summary related to situations historically encountered on projects of this nature. 15 refs.

Doellner, O.L.

1992-02-01T23:59:59.000Z

396

Memory effects in radiative jet energy loss  

E-Print Network [OSTI]

In heavy-ion collisions the created quark-gluon plasma forms a quickly evolving background, leading to a time dependent radiative behavior of high momentum partons traversing the medium. We use the Schwinger Keldysh formalism to describe the jet evolution as a non-equilibrium process including the Landau-Pomeranschuk-Migdal effect. Concentrating on photon emission, a comparison of our results to a quasistatic calculation shows good agreement, leading to the conclusion that the radiative behavior follows the changes in the medium almost instantaneously.

Frank Michler; Björn Schenke; Carsten Greiner

2009-05-18T23:59:59.000Z

397

Lessons from System Development  

E-Print Network [OSTI]

sci- entists and engineers conducts ground operations. Most of these people are at the Jet Propulsion

Filman, Robert E.

398

SIMULATION AND MOCKUP OF SNS JET-FLOW TARGET WITH WALL JET FOR CAVITATION DAMAGE MITIGATION  

SciTech Connect (OSTI)

Pressure waves created in liquid mercury pulsed spallation targets at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory induce cavitation damage on the stainless steel target container. The cavitation damage is thought to limit the lifetime of the target for power levels at and above 1 MW. Severe through-wall cavitation damage on an internal wall near the beam entrance window has been observed in spent-targets. Surprisingly though, there is very little damage on the walls that bound an annular mercury channel that wraps around the front and outside of the target. The mercury flow through this channel is characterized by smooth, attached streamlines. One theory to explain this lack of damage is that the uni-directional flow biases the direction of the collapsing cavitation bubble, reducing the impact pressure and subsequent damage. The theory has been reinforced by in-beam separate effects data. For this reason, a second-generation SNS mercury target has been designed with an internal wall jet configuration intended to protect the concave wall where damage has been observed. The wall jet mimics the annular flow channel streamlines, but since the jet is bounded on only one side, the momentum is gradually diffused by the bulk flow interactions as it progresses around the cicular path of the target nose. Numerical simulations of the flow through this jet-flow target have been completed, and a water loop has been assembled with a transparent test target in order to visualize and measure the flow field. This paper presents the wall jet simulation results, as well as early experimental data from the test loop.

Wendel, Mark W [ORNL; Geoghegan, Patrick J [ORNL; Felde, David K [ORNL

2014-01-01T23:59:59.000Z

399

DEUTERONBEAMINTERACTIONWITH Li JET FOR A NEUTRONSOURCE TEST FACILITY*  

E-Print Network [OSTI]

DEUTERONBEAMINTERACTIONWITH Li JET FOR A NEUTRONSOURCE TEST FACILITY* A. Hassanein Argonne National Laboratory 9700 South Cass Avenue Argonne, Illinois 60439 USA The submitted manurript has teen authored Interaction with Li Jet for a NeutronSource Test Facility* A. Hassanein Argonne National Laboratory, Argonne

Harilal, S. S.

400

Acid Placement in Acid Jetting Treatments in Long Horizontal Wells  

E-Print Network [OSTI]

In the Middle East, extended reach horizontal wells (on the order of 25,000 feet of horizontal displacement) are commonly acid stimulated by jetting acid out of drill pipe. The acid is jetted onto the face of the openhole wellbore as the drill pipe...

Sasongko, Hari

2012-07-16T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Acid placement and coverage in the acid jetting process  

E-Print Network [OSTI]

Many open-hole acid treatments are being conducted by pumping acid through jetting ports placed at the end of coiled tubing or drill pipe. The filter-cake on the bore-hole is broken by the jet; the acid-soluble material is dissolved, creating...

Mikhailov, Miroslav I.

2009-05-15T23:59:59.000Z

402

Behavior of shale oil jet fuels at variable severities  

SciTech Connect (OSTI)

Catalytic hydroprocessed shale oil jet fuels in the USA were characterized and compared with petroleum jet fuel to demonstrate their possibility as a conventional jet fuel substitute. The shale oils (Geokinetics, Occidental, Paraho and Tosco II) were hydrotreated in a 0.058m ID by 1.52m long reactor containing Ni/MO/Al/sub 2/O/sub 3/ catalyst. The fractionated hydrogenated shale oils at jet fuel ranges (120-300/sup 0/C) were analyzed for composition and physical properties. The increasing hydroprocessing severity proportionally decreased nitrogen, sulfur, olefins, and aromatics, and increased hydrogen content. The nitrogen content even at high severity conditions was considerably higher than that of conventional jet fuel. Sulfur and olefin contents were lower at all severities. The heat of combustion and the physical properties, except the freezing point, were comparable to petroleum jet fuels. The yields of jet fuels increased proportionally to increased severity. The study showed that high severity hydroprocessing gave better performance in processing shale oils to jet fuels.

Mukherjee, N.L.

1988-01-01T23:59:59.000Z

403

Effects of Chronic Jet Lag on Tumor Progression in Mice  

Science Journals Connector (OSTI)

...statistical significance as a function of lighting schedule, with poorest survival in jet-lagged...Research Training Fellowship from the Medical Research Council (to V. King). The...chronic jet lag Variable/experiment no. Lighting schedule Dominant period (h) Corresponding...

Elisabeth Filipski; Franck Delaunay; Verdun M. King; Ming-Wei Wu; Bruno Claustrat; Aline Gréchez-Cassiau; Catherine Guettier; Michael H. Hastings; and Lévi Francis

2004-11-01T23:59:59.000Z

404

Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for  

E-Print Network [OSTI]

Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for Adhesion Improvement Uwe studied the activation mechanism of polyethylene (PE) for a pretreatment with a commercial APPJ system jet system from Plasmatreat GmbH (Steinhagen, Germany) was used for the Full Paper Polyethylene (PE

Greifswald, Ernst-Moritz-Arndt-Universität

405

CONTROL OF COHERENT STRUCTURE IN COAXIAL SWIRLING TURBULENT JETS  

E-Print Network [OSTI]

stronger effect than the pilot jet itself, leading to an almost entire removal of coherent structures. 2.2. Flow Instability Swirl is naturally presented in the exhaust from a turbine or an axial flow pump, and may be deliberately generated... ............................................................................................. 1 2. REVIEW OF LITERATURE............................................................................. 6 2.1. Turbulent Jets with Swirl................................................................................ 7 2.2. Flow Instability...

Lee, Wonjoong

2008-01-01T23:59:59.000Z

406

Nonequilibrium Alfvénic Plasma Jets Associated with Spheromak Formation  

Science Journals Connector (OSTI)

Nonequilibrium Alfvénic flows have been observed in plasma jets during the helicity injection stage of the Caltech spheromak experiment. Density and time of flight measurements of these jets show that the flows convect dense plasma (??1) because of the axial gradient in the current channel profile. A simplified MHD theory is derived to model the flow.

Deepak Kumar and Paul M. Bellan

2009-09-04T23:59:59.000Z

407

Visualization of Jet Mixing in a Fluidic Oscillator  

Science Journals Connector (OSTI)

The fluidic oscillator is a device that generates an oscillating jet when supplied with fluid at pressure. The oscillator has no moving parts - the creation of the unsteady jet is based solely on fluid-dynamic interactions. Fluidic oscillators can operate ... Keywords: Flow control, Fluid mixing, Fluidic oscillator, Pressure-sensitive paint

J. W. Gregory; J. P. Sullivan; S. Raghu

2005-04-01T23:59:59.000Z

408

Search for New Physics in the Jets + Missing ET topology  

SciTech Connect (OSTI)

Although the standard model of particle physics agrees perfectly with experimental data, it is unlikely the final theory describing particles and their interactions. New phenomena has been searched in the jets and missing transverse energy topology. Such phenomena may be due to the pair production of leptoquarks decaying into a quark and a neutrino or the pair production of stops decaying into a charm and a neutralino which is assumed to be the lightest supersymmetric particle. These searches have been performed with the D0 detector at hadronic collider TeVatron with a center of mass energy of 1.96 TeV. This kind of search needs a good understanding of the jet energy calibration. The determination of the relative jet energy scale has allowed them to reduce the systematic uncertainties on the jet energy measurement when comparing the data and the simulation. Moreover a new method has been developed in order to correct simulated jets for the differences observed in the jet energy scale, the jet energy resolution and the jet reconstruction efficiency between the data and the simulation. The data analysis, performed with an integrated luminosity of 310 pb{sup -1}, has not observed any excess. This result is interpreted in terms of limit on the mass of the particles: leptoquarks with a mass smaller than 136 GeV and stops with a mass smaller than 131 GeV, for a neutralino mass equal to 46 GeV, are excluded with 95% confidence level.

Makovec, Nikola Michel; /Orsay

2006-05-01T23:59:59.000Z

409

Measurements of Vector Bosons Produced in Association with Jets  

E-Print Network [OSTI]

The latest D0 and CDF measurements of the important $W+{\\rm jets}$ and $Z/\\gamma^{*}+{\\rm jets}$ processes are described, along with a discussion of the comparisons that have been made to LO and NLO perturbative QCD predictions.

Cooper, Ben

2008-01-01T23:59:59.000Z

410

Modified Black Hole with Polar Jet and Vortex  

E-Print Network [OSTI]

There are many models relating an accretion disk of Black Hole to jet outflow. The herein heuristic model describes the continuation of an external accretion disk to an internal accretion disk for less than Black Hole horizon, and subsequent polar jet outflow along polar axis out of polar vortex wherein the event horizon is no longer descriptive.

T. Tmmalm

2001-12-06T23:59:59.000Z

411

Substructure of High-pT Jets at the LHC  

E-Print Network [OSTI]

of high-pT Jets at the LHC Leandro G. Almeida, Seung J. Lee,of high-p T Jets at the LHC Leandro G. Almeida a , Seung J.the Large Hadron Collider (LHC), events with highly-boosted

Almeida, L.G.

2009-01-01T23:59:59.000Z

412

NETL: News Release - Jet Engine Successful in Fighting Mine Fire  

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

2, 2003 2, 2003 Jet Engine Successful in Fighting Mine Fire Energy Department's Assistance Brings West Virginia Coal Miners Back To Work One Year Early - Australian Jet Engine Successfully Fights West Virginia Mine Fire - By blowing its exhaust into the underground mine, the modified jet engine was able to snuff out the mine fire much faster than traditional methods. FAIRVIEW, WV - A modified jet engine has been used to successfully fight a West Virginia mine fire that had been burning for nearly two months and was the cause of 300 employees being temporarily laid off when mine operations were idled. Positioned at the mouth of the one of the mineshafts, the jet engine was used to blow water vapor and inert gases into the mine to smother the fire by creating an inert environment underground. It was the

413

Rising Jet-Inflated Bubbles in Clusters of Galaxies  

E-Print Network [OSTI]

We conduct three-dimensional axisymmetric hydrodynamical numerical simulations of bubble evolution in clusters of galaxies. We inflate bubbles using slow, massive jets with a wide opening angle, and follow their evolution as they rise through the intra-cluster medium (ICM). We find that these jet-inflated bubbles are quite stable, and can reach large distances in the cluster while still maintaining their basic structure. The stability of the jet-inflated bubble comes mainly from the dense shell that forms around it during it's inflation stage, and from the outward momentum of the bubble and the shell. On the contrary, bubbles that are inserted by hand onto the grid and not inflated by a jet, i.e., an artificial bubble, lack these stabilizing factors, therefore, they are rapidly destroyed. The stability of the jet-inflated bubble removes the demand for stabilizing magnetic fields in the bubble.

Sternberg, Assaf

2008-01-01T23:59:59.000Z

414

Rising Jet-Inflated Bubbles in Clusters of Galaxies  

E-Print Network [OSTI]

We conduct two-dimensional axisymmetric (referred to as 2.5D) hydrodynamical numerical simulations of bubble evolution in clusters of galaxies. We inflate bubbles using slow, massive jets with a wide opening angle, and follow their evolution as they rise through the intra-cluster medium (ICM). We find that these jet-inflated bubbles are quite stable, and can reach large distances in the cluster while still maintaining their basic structure. The stability of the jet-inflated bubble comes mainly from the dense shell that forms around it during it's inflation stage, and from the outward momentum of the bubble and the shell. On the contrary, bubbles that are inserted by hand onto the grid and not inflated by a jet, i.e., an artificial bubble, lack these stabilizing factors, therefore, they are rapidly destroyed. The stability of the jet-inflated bubble removes the demand for stabilizing magnetic fields in the bubble.

Assaf Sternberg; Noam Soker

2008-05-15T23:59:59.000Z

415

Jet?vortex Interaction: A Numerical Study  

Science Journals Connector (OSTI)

The interaction of a vortex and a jet plays an important role for many industrial processes such as Carbon Black formation or combustion in diesel engines. The knowledge of physics of these phenomena is crucial for engineers but also for scientists who wish to reveal many interesting and complex issues hidden there. In this research we numerically investigate cases where a cylindrical reactor is charged with gas injected through five ports. The first one is located along the main axis of the cylinder and this leads to the formation of the main jet. The other four ports are situated along the side walls such that the gas entering the cylinder tangentially through them causes a vortex to be formed. The objective of this paper is to show the fundamental physical phenomena and also how the initial and boundary conditions influence the results. Our most important observation at this stage is that the mixing process is more intense if the vortex is inclined towards x?axis. The results are mainly shown as snapshots of gas velocity.

Catalin G. Ilea; Pawel Kosinski; Alex C. Hoffmann

2009-01-01T23:59:59.000Z

416

Double row loop-coil configuration for high-speed electrodynamic maglev suspension, guidance, propulsion and guideway directional switching  

DOE Patents [OSTI]

A stabilization and propulsion system are disclosed comprising a series of loop-coils arranged in parallel rows wherein two rows combine to form one of two magnetic rails. Levitation and lateral stability are provided when the induced field in the magnetic rails interacts with the superconducting magnets mounted on the magnetic levitation vehicle. The loop-coils forming the magnetic rails have specified dimensions and a specified number of turns and by constructing differently these specifications, for one rail with respect to the other, the angle of tilt of the vehicle can be controlled during directional switching. Propulsion is provided by the interaction of a traveling magnetic wave associated with the coils forming the rails and the superconducting magnets on the vehicle. 12 figs.

He, J.; Rote, D.M.

1996-05-21T23:59:59.000Z

417

Potential use of the Large Coil Test Facility (LCTF) for testing of ion thrusters for nuclear electric propulsion  

SciTech Connect (OSTI)

Nuclear Electric Propulsion (NEP) is one of several supporting technologies identified as necessary for exploration of the planets. At a workshop held in June 1990, experts from national laboratories and industry identified approximately a dozen reactor concepts to produce electric power to drive ion thrusters which convert the electricity into propulsion. Subsequent to the workshop, a DOE-sponsored facilities panel toured U.S. facilities where the technologies might be developed and tested. The Large Coil Test Facility (LCTF) at Oak Ridge National Laboratory (ORNL) is an attractive option for testing of ion thrusters. This paper reviews the thruster concepts proposed, discusses key features of the LCTF, and outlines how thruster testing could be performed in this facility.

Homan, F.J.; Lubell, M.S.; Schwenterly, S.W.; Whealton, J.H. (Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States))

1993-01-20T23:59:59.000Z

418

Heavy Vehicle Propulsion System Materials Program Semiannual Progress Report for October 1998 Through March 1999  

SciTech Connect (OSTI)

The purpose of the Heavy Vehicle Propulsion System Materials Program is the development of materials: ceramics, intermetallics, metal alloys, and metal and ceramic coatings, to support the dieselization of class 1-3 trucks to realize a 35% fuel-economy improvement over current gasoline-fueled trucks and to support commercialization of fuel-flexible LE-55 low-emissions, high-efficiency diesel engines for class 7-8 trucks. The Office of Transportation Technologies, Office of Heavy Vehicle Technologies (OIT OHVT) has an active program to develop the technology for advanced LE-55 diesel engines with 55% efficiency and low emissions levels of 2.0 g/bhp-h NOX and 0.05 g/bhp-h particulate. The goal is also for the LE-55 engine to run on natural gas with efficiency approaching that of diesel fuel. The LE-55 program is being completed in FY 1997 and, after approximately 10 years of effort, has largely met the program goals of 55% efficiency and low emissions. However, the commercialization of the LE-55 technology requires more durable materials than those that have been used to demonstrate the goals. Heavy Vehicle Propulsion System Materials will, in concert with the heavy duty diesel engine companies, develop the durable materials required to commercialize the LE-55 technologies. OIT OHVT also recognizes a significant opportunity for reduction in petroleum consumption by dieselization of pickup trucks, vans, and sport utility vehicles. Application of the diesel engine to class 1,2, and 3 trucks is expected to yield a 35% increase in fuel economy per vehicle. The foremost barrier to diesel use in this market is emission control. Once an engine is made certifiable, subsequent challenges will be in cost; noise, vibration, and harshness (NVH); and performance. The design of advanced components for high-efficiency diesel engines has, in some cases, pushed the performance envelope for materials of construction past the point of reliable operation. Higher mechanical and tribological stresses and higher temperatures of advanced designs limit the engine designer; advanced materials allow the design of components that may operate reliably at higher stresses and temperatures, thus enabling more efficient engine designs. Advanced materials also offer the opportunity to improve the emissions, NVH, and performance of diesel engines for pickup trucks, vans, and sport utility vehicles. The principal areas of research are: (1) Cost Effective High Performance Materials and Processing; (2) Advanced Manufacturing Technology; (3)Testing and Characterization; and (4) Materials and Testing Standards.

Johnson, R.D.

1999-06-01T23:59:59.000Z

419

Alkali metal Rankine cycle boiler technology challenges and some potential solutions for space nuclear power and propulsion applications  

SciTech Connect (OSTI)

Alkali metal boilers are of interest for application to future space Rankine cycle power conversion systems. Significant progress on such boilers was accomplished in the 1960's and early 1970's, but development was not continued to operational systems since NASA's plans for future space missions were drastically curtailed in the early 1970's. In particular, piloted Mars missions were indefinitely deferred. With the announcement of the Space Exploration Initiative (SEI) in July 1989 by President Bush, interest was rekindled in challenging space missions and, consequently in space nuclear power and propulsion. Nuclear electric propulsion (NEP) and nuclear thermal propulsion (NTP) were proposed for interplanetary space vehicles, particularly for Mars missions. The potassium Rankine power conversion cycle became of interest to provide electric power for NEP vehicles and for 'dual-mode' NTP vehicles, where the same reactor could be used directly for propulsion and (with an additional coolant loop) for power. Although the boiler is not a major contributor to system mass, it is of critical importance because of its interaction with the rest of the power conversion system; it can cause problems for other components such as excess liquid droplets entering the turbine, thereby reducing its life, or more critically, it can drive instabilities-some severe enough to cause system failure. Funding for the SEI and its associated technology program from 1990 to 1993 was not sufficient to support significant new work on Rankine cycle boilers for space applications. In Fiscal Year 1994, funding for these challenging missions and technologies has again been curtailed, and planning for the future is very uncertain. The purpose of this paper is to review the technologies developed in the 1960's and 1970's in the light of the recent SEI applications. In this way, future Rankine cycle boiler programs may be conducted most efficiently.

Stone, J.R.

1994-07-01T23:59:59.000Z

420

Effect of severity on catalytic hydroprocessed shale oil jet fuels  

SciTech Connect (OSTI)

Catalytic hydroprocessed shale oil jet fuels in the USA were characterized and compared with petroleum jet fuel to demonstrate their possibility as a conventional jet fuel substitute. The shale oils (Geokinetics, Occidental, Paraho and Tosco II) were hydrotreated in a 0.0508m ID by K1.524m long reactor containing Ni/Mo/Al/sub 2/O/sub 3/ catalyst. The fractionated hydrogenated shale oils at jet fuel ranges (120-300/degree/C) were analyzed for composition and physical properties. The increasing hydroprocessing severity proportionally decreased nitrogen, sulfur, olefins, aromatics and increased hydrogen content. The nitrogen content was considerable higher even at high severity conditions. Sulfur and olefin contents were lower at all severities. The heat of combustion and the physical properties, except the freezing point, were comparable to petroleum jet fuels. The yields of jet fuels increased proportionally to increased severity. The study showed that high severity hydroprocessing gave better performance in processing shale oils to jet fuels.

Mukherjee, N.L.

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Luminosity function and jet structure of Gamma Ray Bursts  

E-Print Network [OSTI]

The structure of Gamma Ray Burst (GRB) jets impacts on their prompt and afterglow emission properties. The jet of GRBs could be uniform, with constant energy per unit solid angle within the jet aperture, or it could instead be structured, namely with energy and velocity that depend on the angular distance from the axis of the jet. We try to get some insight about the still unknown structure of GRBs by studying their luminosity function. We show that low (1e46-1e48 erg/s) and high (i.e. with L > 1e50 erg/s) luminosity GRBs can be described by a unique luminosity function, which is also consistent with current lower limits in the intermediate luminosity range (1e48-1e50} erg/s). We derive analytical expressions for the luminosity function of GRBs in uniform and structured jet models and compare them with the data. Uniform jets can reproduce the entire luminosity function with reasonable values of the free parameters. A structured jet can also fit adequately the current data, provided that the energy within the ...

Pescalli, A; Salafia, O S; Ghisellini, G; Nappo, F; Salvaterra, R

2014-01-01T23:59:59.000Z

422

X-ray Emission Processes in Radio Jets  

E-Print Network [OSTI]

The emission processes responsible for the observed X-rays from radio jets are commonly believed to be non-thermal, but in any particular case, it is unclear if synchrotron emission or one or more varieties of inverse Compton emission predominates. We present a formulation of inverse Compton emission from a relativistically moving jet (``IC/beaming'') which relies on radio emitting synchrotron sources for which the energy densities in particles and fields are comparable. We include the non-isotropic nature of inverse Compton scattering of the relativistic electrons on photons of the cosmic microwave background (CMB) and provide beaming parameters for a number of jets. A list of X-ray emitting jets is given and the jets are classified on the basis of their morphology and spectral energy distribution to determine their likely emission process. We conclude that these jets have significant bulk relativistic velocities on kpc scales; that higher redshift sources require less beaming because the energy density of the CMB is significantly greater than locally; and that for some nearby sources, synchrotron X-ray emission predominates because the jet makes a large angle to the line of sight.

D. E. Harris; H. Krawczynski

2001-09-27T23:59:59.000Z

423

Drying: a comparison of radial jet reattachment and standard in-line jets  

E-Print Network [OSTI]

line of the nozzle but is shown in two dimensions as seen in the flow visualization. The flow rate of water corresponds to an exit velocity in air of approximately 75 meters per second, using Reynolds number similarity. The reattachment ring.... In this research endeavor, RJR nozzles have been compared to the drying industry's common method of air impingement drying, namely, standard In-Line Jets (ILJ), for several different combinations of flow and geometrical parameters. This gives evidence...

Habetz, Darren Keith

2012-06-07T23:59:59.000Z

424

Production of jet fuels from coal-derived liquids. Volume 5. Recovery of benzene/benzene plus phenol from the Great Pplains Gasification Plant crude phenol stream. Interim report, September 1987-February 1988  

SciTech Connect (OSTI)

In September 1986, the Fuels Branch of the Aero Propulsion Laboratory at Wright-Patterson Air Force Base, Ohio, began an investigation of the potential for production of jet fuels from the liquid by-product streams produced by the gasification of lignite at the Great Plains Gasification Plant located in Buelah, North Dakota. Funding was provided to the U.S. Department of Energy (DOE) Pittsburgh Energy Technology Center (PETC) to administer the experimental portion of this effort. This report details the program with Hydrocarbon Research, Inc., a subcontractor to Burns and Roe Services Corporation, who, as a subcontractor to DOE, investigated the potential of producing benzene or benzene plus phenol from the crude phenol stream.

Harris, E.C.

1988-05-01T23:59:59.000Z

425

ACCRETION-JET CONNECTION IN BLACK HOLES THE ORIGIN OF STELLAR BLACK HOLES &  

E-Print Network [OSTI]

a very large kinetic energy...Moon @ >.9c" #12;POWERFUL DARK JETS FROM BLACK HOLES Radio (Dubner et al erg/sec · NON RADIATIVE JETS = "DARK" JETS · >50% OF THE ENERGY IS NOT RADIATED 1o = 60 pc1arcsec VLA Since their discovery there have been seven International workshops Compact binaries with jets #12

Maryland at College Park, University of

426

Higher-Order Corrections to Timelike Jets  

SciTech Connect (OSTI)

We present a simple formalism for the evolution of timelike jets in which tree-level matrix element corrections can be systematically incorporated, up to arbitrary parton multiplicities and over all of phase space, in a way that exponentiates the matching corrections. The scheme is cast as a shower Markov chain which generates one single unweighted event sample, that can be passed to standard hadronization models. Remaining perturbative uncertainties are estimated by providing several alternative weight sets for the same events, at a relatively modest additional overhead. As an explicit example, we consider Z {yields} q{bar q} evolution with unpolarized, massless quarks and include several formally subleading improvements as well as matching to tree-level matrix elements through {alpha}{sub s}{sup 4}. The resulting algorithm is implemented in the publicly available VINCIA plugin to the PYTHIA8 event generator.

Giele, W.T.; /Fermilab; Kosower, D.A.; /Saclay, SPhT; Skands, P.Z.; /CERN

2011-02-01T23:59:59.000Z

427

Turbulent round jet under gravity waves  

E-Print Network [OSTI]

) Turbulent shear stress &u'w'&/&u, & versus z/x. . . 26 3-5 Overlapped mean axial velocity &u&/&u, & versus zJx of the case of A = 0. 5 cm at six locations corresponding to figure 3-4(a) . . 28 3-6 Horizontal turbulent velocity &u' &' /&u, & versus zJx... of the case of A = 0. 5 cm with z, = 0 at. the moving jet centerline in the range of (a) x/D = 40 - 95, (b) x/D = 40 ? 57, and (c) x/D = 64 - 95 . . 30 3-7 Vertical turbulent velocity &w' & /&u, & versus z Jx of the case of A = 0. 5 cm FIGURE Page with z...

Ryu, Yong Uk

2002-01-01T23:59:59.000Z

428

Airbreathing Laser Propulsion Experiments with 1 {mu}m Terawatt Pharos IIILaser: Part 2  

SciTech Connect (OSTI)

This basic research study examines the physics of airbreathing laser propulsion at the extreme flux range of 1-2x10{sup 11} W/cm{sup 2}--within the air breakdown threshold for l {mu}m radiation--using the terawatt Pharos III neodymium-glass pulsed laser. Six different experimental setups were employed using a 34 mm line focus with 66 {mu}m focal waist, positioned near the flat impulse surface. The 2nd Campaign investigated impulse generation with the laser beam focused at grazing incidence across near horizontal target surfaces, with pulse energies ranging from 55 to 186 J, and pulse-widths of 2 to 30 ns FWHM. Laser generated impulse was measured with a horizontal Plexiglas registered ballistic pendulum equipped with either a steel target insert or 0.5 Tesla permanent magnet (NEIT-40), to quantify changes in the momentum coupling coefficient (C{sub M}). Part 2 of this 2-part paper covers Campaign no. 2 results including C{sub M} performance data, and long exposure color photos of LP plasma phenomena.

Myrabo, L. N.; Lyons, P. W.; Jones, R. A.; Liu, S. [Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); Manka, C. [Space Plasma Branch, Plasma Physics Division, Naval Research Laboratory, Washington, D.C. (United States)

2011-11-10T23:59:59.000Z

429

Rocketdyne Propulsion and Power DOE Operations annual site environmental report 1997  

SciTech Connect (OSTI)

This annual report discusses environmental monitoring at two manufacturing and test sites operated in the Los Angeles area by Rocketdyne Propulsion and Power of Boeing North American, Inc. These are identified as Area 4 of the SSFL and the De Soto site. These sites have been used for research and development (R and D), engineering, and testing in a broad range of technical fields primarily in energy research and nuclear reactor technology. The De Soto site had research and development laboratories involved with nuclear research. This work was terminated in 1995 and only D and D activities will have potential for impact on the environment. Since 1956, Area 4 has been used for work with nuclear materials, including fabricating nuclear reactor fuels, testing nuclear reactors, and dissembling used fuel elements. This work ended in 1988 and subsequent efforts have been directed toward decommissioning and decontamination of the former nuclear facilities. The primary purpose of this report is to present information on environmental and effluent monitoring of DOE-sponsored activities to the regulatory agencies responsible for oversight. Information presented here concentrates on Area 4 at SSFL, which is the only area at SSFL where DOE operations were performed.

Robinson, K.S. [ed.

1998-11-23T23:59:59.000Z

430

Heat pipe cooled heat rejection subsystem modelling for nuclear electric propulsion. Final report  

SciTech Connect (OSTI)

NASA LeRC is currently developing a FORTRAN based computer model of a complete nuclear electric propulsion (NEP) vehicle that can be used for piloted and cargo missions to the Moon or Mars. Proposed designs feature either a Brayton or a K-Rankine power conversion cycle to drive a turbine coupled with rotary alternators. Both ion and magnetoplasmodynamic (MPD) thrusters will be considered in the model. In support of the NEP model, Rocketdyne is developing power conversion, heat rejection, and power management and distribution (PMAD) subroutines. The subroutines will be incorporated into the NEP vehicle model which will be written by NASA LeRC. The purpose is to document the heat pipe cooled heat rejection subsystem model and its supporting subroutines. The heat pipe cooled heat rejection subsystem model is designed to provide estimate of the mass and performance of the equipment used to reject heat from Brayton and Rankine cycle power conversion systems. The subroutine models the ductwork and heat pipe cooled manifold for a gas cooled Brayton; the heat sink heat exchanger, liquid loop piping, expansion compensator, pump and manifold for a liquid loop cooled Brayton; and a shear flow condenser for a K-Rankine system. In each case, the final heat rejection is made by way of a heat pipe radiator. The radiator is sized to reject the amount of heat necessary.

Moriarty, M.P.

1993-11-01T23:59:59.000Z

431

Tank-treading as a means of propulsion in viscous shear flows  

E-Print Network [OSTI]

The use of tank-treading as a means of propulsion for microswimmers in viscous shear flows is taken into exam. We discuss the possibility that a vesicle be able to control the drift in an external shear flow, by varying locally the bending rigidity of its own membrane. By analytical calculation in the quasi-spherical limit, the stationary shape and the orientation of the tank-treading vesicle in the external flow, are determined, working to lowest order in the membrane inhomogeneity. The membrane inhomogeneity acts in the shape evolution equation as an additional force term, that can be used to balance the effect of the hydrodynamic stresses, thus allowing the vesicle to assume shapes and orientations that would otherwise be forbidden. The vesicle shapes and orientations required for migration transverse to the flow, together with the bending rigidity profiles that would lead to such shapes and orientations, are determined. A simple model is presented, in which a vesicle is able to migrate up or down the gradient of a concentration field, by stiffening or softening of its membrane, in response to the variations in the concentration level experienced during tank-treading.

Piero Olla

2011-07-19T23:59:59.000Z

432

APPLIED HTS BULKS AND WIRES TO ROTATING MACHINES FOR MARINE PROPULSION  

Science Journals Connector (OSTI)

High?temperature superconductors allow a compact and efficient way to provide high?torque density to rotating machines with excellent operation. A field pole providing flux density of more than 1.5 T around the armature was initially designed for an axial?gap type with the flux parallel to the rotor axis. Melt?growth Gd?123 bulks as well as Bi?2223 wire windings have been successfully assembled on the rotor disk. No iron core was used though being an auxiliary flux control found in most HTS motors. Both bulk and wire types have realized a practical motor operation within a limited output range. For bulks a 15 kW 720 rpm synchronous motor was designed and tested in the group of TUMSAT Kitano Seiki and University of Fukui. A bulk field pole was cooled down by liquid nitrogen and was magnetized in the motor. To enhance the output power to more than 30 kW we developed a thermosyphon system using condensed neon. Another field pole with HTS wire for large?scale marine propulsion is also discussed on a 100 kW 230 rpm tested machine. A closed?cycle condensed neon associated with thermal insulation is also reported.

M. Miki; B. Felder; Y. Kimura; K. Tsuzuki; R. Taguchi; Y. Shiliang; Y. Xu; T. Ida; M. Izumi

2010-01-01T23:59:59.000Z

433

Apparatus and method for providing oil circulation in a marine propulsion system  

SciTech Connect (OSTI)

A marine propulsion system is described, comprising: a housing including an upper cavity and a lower cavity defined at least in part by an end wall; an upper input shaft adapted to be rotatably driven by an engine and being disposed within the housing upper cavity; an input drive member mounted to the input shaft; a lower propeller shaft disposed within the housing lower cavity; a driven member mounted to the propeller shaft and located within the housing lower cavity so as to be axially spaced from the lower cavity end wall to define a space there between; drive means disposed between the drive member and the driven member and imparting rotation to the propeller shaft in response to rotation of the input shaft; a quantity of lubricant provided in the housing; a lubricant supply passage providing communication between the lower cavity and the input shaft cavity, and including an inlet in the housing lower cavity opening into the space located between the lower cavity end wall and the driven member, so that rotation of the driven member supplies lubricant under pressure to the space and to the inlet of the supply passage, with the lubricant flowing there through to the input shaft cavity; and a return passage communicating between the input shaft cavity and the lower cavity for providing return flow of lubricant from the input shaft cavity to the lower cavity.

Schueller, N.M.; Meisenburg, G.L.; Gray, C.F. Jr.

1993-08-17T23:59:59.000Z

434

Feasibility study of a nonequilibrium MHD accelerator concept for hypersonic propulsion ground testing  

SciTech Connect (OSTI)

A National Aeronautics and Space Administration (NASA) funded research study to evaluate the feasibility of using magnetohydrodynamic (MHD) body force accelerators to produce true air simulation for hypersonic propulsion ground testing is discussed in this paper. Testing over the airbreathing portion of a transatmospheric vehicle (TAV) hypersonic flight regime will require high quality air simulation for actual flight conditions behind a bow shock wave (forebody, pre-inlet region) for flight velocities up to Mach 16 and perhaps beyond. Material limits and chemical dissociation at high temperature limit the simulated flight Mach numbers in conventional facilities to less than Mach 12 for continuous and semi-continuous testing and less than Mach 7 for applications requiring true air chemistry. By adding kinetic energy directly to the flow, MHD accelerators avoid the high temperatures and pressures required in the reservoir region of conventional expansion facilities, allowing MHD to produce true flight conditions in flight regimes impossible with conventional facilities. The present study is intended to resolve some of the critical technical issues related to the operation of MHD at high pressure. Funding has been provided only for the first phase of a three to four year feasibility study that would culminate in the demonstration of MHD acceleration under conditions required to produce true flight conditions behind a bow shock wave to flight Mach numbers of 16 or greater. MHD critical issues and a program plan to resolve these are discussed.

Lee, Ying-Ming; Simmons, G.A.; Nelson, G.L. [MSE Inc., Butte, MT (United States)

1995-12-31T23:59:59.000Z

435

Flyer Acceleration by Pulsed Ion Beam Ablation and Application for Space Propulsion  

SciTech Connect (OSTI)

Flyer acceleration by ablation plasma pressure produced by irradiation of intense pulsed ion beam has been studied. Acceleration process including expansion of ablation plasma was simulated based on fluid model. And interaction between incident pulsed ion beam and a flyer target was considered as accounting stopping power of it. In experiments, we used ETIGO-II intense pulsed ion beam generator with two kinds of diodes; 1) Magnetically Insulated Diode (MID, power densities of <100 J/cm2) and 2) Spherical-focused Plasma Focus Diode (SPFD, power densities of up to 4.3 kJ/cm2). Numerical results of accelerated flyer velocity agreed well with measured one over wide range of incident ion beam energy density. Flyer velocity of 5.6 km/s and ablation plasma pressure of 15 GPa was demonstrated by the present experiments. Acceleration of double-layer target consists of gold/aluminum was studied. For adequate layer thickness, such a flyer target could be much more accelerated than a single layer. Effect of waveform of ion beam was also examined. Parabolic waveform could accelerate more efficiently than rectangular waveform. Applicability of ablation propulsion was discussed. Specific impulse of 7000{approx}8000 seconds and time averaged thrust of up to 5000{approx}6000N can be expected. Their values can be controllable by changing power density of incident ion beam and pulse duration.

Harada, Nobuhiro; Buttapeng, Chainarong; Yazawa, Masaru [Department of Electrical Engineering, Nagaoka University of Technology, 1603 Kamitomioka, Nagaoka 940-2188 (Japan); Kashine, Kenji [Department of Electrical and Electronic Engineering, Kagoshima National College of Technology, 1460-1 Shinko, Hayato-cho, Aira-gun, Kagoshima 899-5193 (Japan); Jiang Weihua; Yatsui, Kiyoshi [Extreme Energy Density Research Institute, Nagaoka University of Technology, 1603 Kamitomioka, Nagaoka 940-2188 (Japan)

2004-02-04T23:59:59.000Z

436

Heavy Vehicle Propulsion System Materials Program semiannual progress report for October 1996 through March 1997  

SciTech Connect (OSTI)

The purpose of the Heavy Vehicle Propulsion System Materials Program is the development of materials: ceramics, intermetallics, metal alloys, and metal and ceramic coatings, to support the dieselization of class 1-3 trucks to realize a 35% fuel-economy improvement over current gasoline-fueled trucks and to support commercialization of fuel-flexible LE-55 low-emissions, high-efficiency diesel engines for class 7-8 trucks. The design of advanced components for high-efficiency diesel engines has, in some cases, pushed the performance envelope for materials of construction past the point of reliable operation. Higher mechanical and tribological stresses and higher temperatures of advanced designs limit the engine designers; advanced materials allow the design of components that may operate reliably at higher stresses and temperatures, thus enabling more efficient engine designs. Advanced materials also offer the opportunity to improve the emissions, NVH, and performance of diesel engines for pickup trucks, vans, and sport utility vehicles. The principal areas of research are: (1) cost effective high performance materials and processing; (2) advanced manufacturing technology; (3) testing and characterization; and (4) materials and testing standards.

NONE

1997-07-01T23:59:59.000Z

437

Multiple pole electromagnetic propulsion system with separated ballistic guidance and electrical current contact surfaces  

DOE Patents [OSTI]

An electromagnetic propulsion system is disclosed having separate rails for ballistic guidance and for carrying current. In this system, one or more pairs of ballistic guidance rails are provided, with each ballistic guidance rail having a pair of current carrying rails joined to it to form a combined rail. Each combined rail is separated electrically from adjacent combined rails by electrically insulating blocks. Each of the current carrying rails in a given combined rail pair have the same electrical polarity, and the polarities alternate between adjacent combined rails. Armatures contact current carrying rails to complete the circuit to generate the accelerating Lorentz force on the armatures. Bore riders on the sabot and/or projectile are in contact with the ballistic guide rails. Separation of the current carrying and ballistic guidance functions increases resistance of the system to rail movement and bending, as well as reduced wear/damage to the rails. In further embodiments, a circumferential over wrap providing compressive force on the rails further increases resistance of the system to rail movement and bending.

Sims, Jr., James R. (Los Alamos, NM)

2008-07-15T23:59:59.000Z

438

A FLUX ROPE ERUPTION TRIGGERED BY JETS  

SciTech Connect (OSTI)

We present an observation of a filament eruption caused by recurrent chromospheric plasma injections (surges/jets) on 2006 July 6. The filament eruption was associated with an M2.5 two-ribbon flare and a coronal mass ejection (CME). There was a light bridge in the umbra of the main sunspot of NOAA 10898; one end of the filament was terminated at the region close to the light bridge, and recurrent surges were observed to be ejected from the light bridge. The surges occurred intermittently for about 8 hr before the filament eruption, and finally a clear jet was found at the light bridge to trigger the filament eruption. We analyzed the evolutions of the relative darkness of the filament and the loaded mass by the continuous surges quantitatively. It was found that as the occurrence of the surges, the relative darkness of the filament body continued growing for about 3-4 hr, reached its maximum, and kept stable for more than 2 hr until it erupted. If suppose 50% of the ejected mass by the surges could be trapped by the filament channel, then the total loaded mass into the filament channelwill be about 0.57x10{sup 16} g with a momentum of 0.57x10{sup 22} g cm s{sup -1} by 08:08 UT, which is a non-negligible effect on the stability of the filament. Based on the observations, we present a model showing the important role that recurrent chromospheric mass injection play in the evolution and eruption of a flux rope. Our study confirms that the surge activities can efficiently supply the necessary material for some filament formation. Furthermore, our study indicates that the continuous mass with momentum loaded by the surge activities to the filament channel could make the filament unstable and cause it to erupt.

Guo Juan; Zhang Hongqi; Deng Yuanyong; Lin Jiaben; Su Jiangtao [Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012 (China); Liu Yu, E-mail: guojuan@bao.ac.c [Yunnan Astronomical Observatory, National Astronomical Observatories, Kunming 650011 (China)

2010-03-10T23:59:59.000Z

439

ePLAS Development for Jet Modeling and Applications  

SciTech Connect (OSTI)

Plasma jets provide an alternate approach to the creation of high energy density laboratory plasmas (HEDLP). For the Plasma Liner Experiment (PLX), typically 30 partially ionized argon jets, produced with mini-rail guns, will be focused into a central volume for subsequent magnetic compression into high density plasma liners that can reach high (0.1 Mbar) peak pressures upon stagnation. The jets are typically 2.5 cm in radius traveling at Mach number 30. Ultimate success will require optimized tuning of the rail configurations, the nozzles injecting the gases, and the careful implementation of pre-ionization. The modeling of plasma jet transport is particularly challenging, due the large space (100 sq cm) and time scales (microseconds) involved. Even traditional implicit methods are insufficient, due to the usual need to track electrons explicitly on the mesh. Wall emission and chemistry must be managed, as must ionization of the jet plasma. Ions in the jets are best followed as particles to account properly for collisions upon jet merger. This Phase I Project developed the code ePLAS to attack and successfully surmount many of these challenges. It invented a new 'super implicit' electromagnetic scheme, using implicit electron moment currents that allowed for modeling of jets over multi-cm and multi-picoseconds on standard, single processor 2 GHz PCs. It enabled merger studies of two jets, in preparation for the multi-jet merger problem. The Project explored particle modeling for the ions, and prepared for the future addition of a grid-base jet ion collision model. Access was added to tabular equations of state for the study of ionization effects in merging jets. The improved code was discussed at the primary plasma meetings (IEEE and APS) during the Project period. Collaborations with National Laboratory and industrial partners were nurtured. Code improvements were made to facilitate code use. See: http://www.researchapplicationscorp.com. The ePLAS code enjoys EAR99 export control treatment, permitting distribution to most foreign countries without a license.

Dr. Rodney J. Mason

2011-09-07T23:59:59.000Z

440

Pneumatic cleaning of sugarcane utilizing a high velocity air jet  

E-Print Network [OSTI]

- oped to cope with the increased amount of trash present in unburned sugarcane. This research involved the testing and computer simulation of a chopper air jet nozzle assembly. The experimental test setup included a two-stage conveyor. This conveyor... of cleaning produced by the system and the amount of momentum produced by the air jet. When unburned, untopped sugarcane was fed. into the chopper air jet nozzle assembly, a result of 9/~ trash in the bottom conveyor was achieved, A value of 14/ trash...

Fisher, John Ray

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

Structure of the low level jet over Texas  

E-Print Network [OSTI]

STRUCTURE OF THE LOW LEVEL JET OVER TEXAS A Thesis by Michel Stuart Damiani Jr. Submitted to the Graduate College of Texas A&M University in partial fulfullment of the requirements for the degree of MASTER OF SCIENCE May 1979 Major Subject... Jet Over Texas (May, 1979) Michel S. Damiani Jr. , B. A. , Univ. of St. Thomas Directed by Dr. Dusan Djuric The intial stage of the low level jet has been studied over Texas and Oklahoma during the winter months of 1974 through 1976. The low level...

Damiani, Michel Stuart

2012-06-07T23:59:59.000Z

442

Simulation of the Interaction Between Two Counterflowing Rarefied Jets  

SciTech Connect (OSTI)

A preliminary analysis of the flow between a jet of argon plasma and one containing argon excited states is conducted using the direct simulation Monte Carlo method (DSMC). As a prelude to the use of more advanced models and to help design the accompanying experiment, a simplified model is formulated that ignores electron kinetics and field effects. This model allows the capture of most of the gas dynamics phenomena present with a standard DSMC code. Two interaction criteria are then used and compared to analyze the flow pattern of the interaction. An increase in the mass flow rate of the neutral jet is found to increase the level of interaction between the jets.

Galitzine, Cyril; Boyd, Iain D. [Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109 (United States)

2011-05-20T23:59:59.000Z

443

QCD corrections to Higgs-boson decay and jet analysis  

Science Journals Connector (OSTI)

We have calculated, within the framework of an on-shell renormalization scheme, the first-order QCD corrections to the rate of Higgs-boson decay to heavy quarks. Our analytic results are in complete agreement with those of Braaten and Leveille. We have also considered the Sterman-Weinberg jet structure for two- and three-jet decays of the Higgs boson. Here our results differ somewhat from those of Braaten and Leveille so we discuss the origin of this discrepancy; we extend their work by keeping the quark mass in the jet formulation.

Pat Kalyniak; Nita Sinha; Rahul Sinha; John N. Ng

1991-06-01T23:59:59.000Z

444

The Different Configurations of the East Asian Polar Front Jet and Subtropical Jet and the Associated Rainfall Anomalies over Eastern China in Summer  

Science Journals Connector (OSTI)

To investigate the concurrent impacts of the East Asian polar front jet (EAPJ) and subtropical jet (EASJ) on the summer rainfall over eastern China, positive (strengthened EAPJ with weakened EASJ) and negative (weakened EAPJ with strengthened EASJ)...

Dan-Qing Huang; Jian Zhu; Yao-Cun Zhang; An-Ning Huang

2014-11-01T23:59:59.000Z

445

Eddy-mean flow interactions in western boundary current jets  

E-Print Network [OSTI]

This thesis examines the nature of eddy-mean flow interactions in western boundary current jets and recirculation gyre dynamics from both theoretical and observational perspectives. It includes theoretical studies of ...

Waterman, Stephanie N

2009-01-01T23:59:59.000Z

446

Elastic–plastic modelling of shaped charge jet penetration  

Science Journals Connector (OSTI)

...of shaped charge jet penetration Roman Novokshanov...modelling of high-rate penetration of a metal target by...best studied is that of penetration of an inviscid liquid...cavitating flow balancing the rate of change of momentum...

2006-01-01T23:59:59.000Z

447

Abrupt Changes in Confinement in the JET Tokamak  

Science Journals Connector (OSTI)

Analysis of a high performance plasma in JET has uncovered large abrupt changes in confinement. The change in the plasma configuration at these times is small and it appears that the confinement is not determined by the macroscopic plasma parameters.

J. A. Wesson and B. Balet

1996-12-23T23:59:59.000Z

448

Experimental High Velocity Acid Jetting in Limestone Carbonates  

E-Print Network [OSTI]

Acid jetting is a well stimulation technique that is used in carbonate reservoirs. It typically involves injecting acid down hole at high flow rates through small orifices which cause high velocities of acid to strike the borehole wall...

Holland, Christopher

2014-04-30T23:59:59.000Z

449

A device for debridement using high pressure water jets  

E-Print Network [OSTI]

Removing devitalized tissue from chronic wounds through debridement is critical to promote wound healing. In this thesis, technology using high-speed water jets is explored toward applications for debridement. After ...

Brown, Ashley (Ashley A.)

2014-01-01T23:59:59.000Z

450

GRAVITATIONAL WAVES OF JET PRECESSION IN GAMMA-RAY BURSTS  

SciTech Connect (OSTI)

The physical nature of gamma-ray bursts (GRBs) is believed to involve an ultra-relativistic jet. The observed complex structure of light curves motivates the idea of jet precession. In this work, we study the gravitational waves of jet precession based on neutrino-dominated accretion disks around black holes, which may account for the central engine of GRBs. In our model, the jet and the inner part of the disk may precess along with the black hole, which is driven by the outer part of the disk. Gravitational waves are therefore expected to be significant from this black-hole-inner-disk precession system. By comparing our numerical results with the sensitivity of some detectors, we find that it is possible for DECIGO and BBO to detect such gravitational waves, particularly for GRBs in the Local Group.

Sun Mouyuan; Liu Tong; Gu Weimin; Lu Jufu, E-mail: tongliu@xmu.edu.cn [Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian 361005 (China)

2012-06-10T23:59:59.000Z

451

Disintegration of Charged Liquid Jets: Results with Isopropyl Alcohol  

Science Journals Connector (OSTI)

...Disintegration of Charged Liquid Jets: Results with Isopropyl Alcohol 10.1126/science.168.3927.118 A. L. Huebner Rocketdyne Division of North American Rockwaell Corporation 6633 Canogoa A venue, Canoga Park, Colifornia 91304 Disintegration processes...

A. L. Huebner

1970-04-03T23:59:59.000Z

452

Modeling Dust Jets And Shells From Comet Hale-Bopp  

Science Journals Connector (OSTI)

Persistent jet and shell structures from comet Hale-Bopp showing gradual changes in the shapes ... declination. Lower limits on the dust and gas production rates at various epochs are presented.

R. Vasundhara; Pavan Chakraborty; Andreas Hänel; Erwin Heiser

453

Gamma ray burst emission: A jet and fireball model  

Science Journals Connector (OSTI)

We discuss some of the properties problems and implications of the jet and fireball model of gamma ray burst emission. This model was suggested by constraints on the opacity of MeV photons to photon?photon pair production.

Richard E. Lingenfelter; Geoffrey J. Hueter

1984-01-01T23:59:59.000Z

454

De-commoditizing the commercial jet engine business  

E-Print Network [OSTI]

This thesis project is a comprehensive application of the Delta Model at a major jet engine manufacturer. It will assess and contrast customer segmentation and customer value proposition via primary research. It will also ...

Soucy, Arthur L

2007-01-01T23:59:59.000Z

455

Science as Art: Jet Engine Airflow | GE Global Research  

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

used heavily by GE Aviation, GE Power & Water, and GE Oil & Gas for the design of turbomachinery, e.g. jet engines, gas turbines, etc. I had the chance to talk with Brian to...

456

Hydrodynamics of Hypersonic Jets: Experiments and Numerical Simulations  

E-Print Network [OSTI]

Stars form in regions of the galaxy that are denser and cooler than the mean interstellar medium. These regions are called Giant Molecular Clouds. At the beginning of their life, up to $10^5-10^6$ years, stars accrete matter from their rich surrounding environment and are origin of a peculiar phenomenon that is the jet emission. Jets from Young Stellar Objects (YSOs) are intensively studied by the astrophysical community by observations at different wavelengths, analytical and numerical modeling and laboratory experiments. Indications about the jet propagation and its resulting morphologies are here obtained by means of a combined study of hypersonic jets carried out both in the laboratory and by numerical simulations.

Belan, Marco; Tordella, Daniela; Massaglia, Silvano; Ferrari, Attilio; Mignone, Andrea; Bodenschatz, Eberhard

2011-01-01T23:59:59.000Z

457

Jet energy scale uncertainty correlations between ATLAS and CMS  

E-Print Network [OSTI]

The correlation of the jet energy scale uncertainties between the ATLAS and CMS experiments are presented in this note. The uncertainty components for both experiments are grouped into categories. For each of these categories, the detailed

CMS Collaboration

2014-01-01T23:59:59.000Z

458

Modified jet calculus of Bassetto, Ciafaloni, and Marchesini  

Science Journals Connector (OSTI)

We reexamine some of the equations derived by Bassetto, Ciafaloni, and Marchesini for the various functions in their extended jet calculus, and derive an alternative set of equations based on the same concepts.

Lorella M. Jones and K. E. Lassila

1982-06-01T23:59:59.000Z

459

The reduction of supersonic jet noise using pulsed microjet injection  

E-Print Network [OSTI]

This thesis is concerned with the active control of supersonic jet noise using pulsed microjet injection at the nozzle exit. Experimental investigations were carried out using this control method on an ideally expanded ...

Ragaller, Paul Aaron

2007-01-01T23:59:59.000Z

460

Measurements of vector boson plus jets from ATLAS  

E-Print Network [OSTI]

Measurements of single W, Z boson production in association with jets probe QCD in multi-scale environment. Measurements of W+jet and Z+ jet production and their ratio, extending to high jet multiplicities, and studying a large set of kinematic distributions are presented for 7 TeV data. The results are compared to the predictions of modern Monte Carlo generators. Production of vector bosons plus heavy flavors studies c and b quark parton distribution functions (PDFs) and gluon splitting effects. Measurements of W + c and Z + b(b) are reported and compared to predictions based on various PDFs in 4 and 5 flavour schemes. An overview of the results is given.

Ninomiya, Y; The ATLAS collaboration

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" 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

The “Stress-drop Jet” in Lake Mendota  

Science Journals Connector (OSTI)

This phenomenon seems to be associated with a rapid decrease of wind stress on the lake surface. It is postulated that the energy for this “jet” is stored in the.

462

Horizontal Divergence Associated with Zonally Isolated Jet Streams  

Science Journals Connector (OSTI)

Horizontal divergence in the upper troposphere associated with zonally isolated jet streams in the climatological-mean fold for the Northern Hemisphere winter is examined by using the wind fields obtained from the NMC operational analyses in the ...

Hisashi Nakamura

1993-07-01T23:59:59.000Z

463

Fracture of brittle multiphase materials by high energy water jets  

Science Journals Connector (OSTI)

High energy water jets are established in processing brittle, inhomogeneous materials like rocks and concrete. Despite their wide ... of application, the failure mechanisms of these materials, especially the infl...

A. Momber; R. Kovacevic

1996-02-15T23:59:59.000Z

464

Effective Field Theory for Higgs Plus Jet Production | Argonne...  

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

includes all possible gluon-Higgs dimension-5 and dimension-7 operators to study Higgs boson plus jet production in next-to-leading order QCD. The EFT sheds light on the effect...

465

Hydrodynamical Simulations of Jet- and Wind-driven Protostellar Outflows  

E-Print Network [OSTI]

We present two-dimensional hydrodynamical simulations of both jet- and wind-driven models for protostellar outflows in order to make detailed comparisons to the kinematics of observed molecular outflows. Comparing the different simulations with observations, we find that some outflows, e.g., HH 212, show features consistent with the jet-driven model, while others, e.g., VLA 05487, are consistent with the wind-driven model.

Chin-Fei Lee; James M. Stone; Eve C. Ostriker; Lee G. Mundy

2001-04-23T23:59:59.000Z

466

Stress measurements in glass using shaped-charge jets  

Science Journals Connector (OSTI)

Stresses were measured in glass targets in the vicinity of a penetrating shaped-charge jet. Stress levels of approximately 0.3 \\{GPa\\} were measured 12–20mm away from a jet formed by a 35mm copper liner. High speed framing camera photographs showed that the penetration velocity in the glass was 2.57 km/s and the glass fracture velocity was 2.10 km/s.

William Lawrence; Robert E. Franz

1987-01-01T23:59:59.000Z

467

Jet Fragmentation in Medium and Vacuum with the PHENIX Detector  

E-Print Network [OSTI]

One of the most active areas of investigation in relativistic heavy-ion collisions is the study of the jet quenching phenomenon whereby hard partons lose their energy as they traverse the hot, dense matter created in such collisions. Strong parton energy loss has been observed in central nucleus-nucleus collisions as evidenced by the a large suppression of the yield of high pT hadrons as compared to the expected yield based on measurements in p+p collisions. Moreover, measurements of back-to-back correlations of charged hadrons suggest that jet shapes are strongly modified modified by the medium. The quantitative interpretation of single and di-hadron measurements is, however, complicated by the fact that the initial parton energy is unknown. A more informative measurement would be one in which the initial parton energy is known, allowing the determination of the fragmentation function, which may be effectively modified from its vacuum form by the presence of the medium. Two measurements in which the initial parton energy may be estimated are discussed in these proceedings: jet reconstruction and two- particle correlations using direct photons. Jet reconstruction in nuclear collisions is challenging due to the large background of soft particles, fluctuations of which give rise to fake jets. Direct photons can be used to estimate the initial parton energy of the recoil jet without recourse to jet reconstruction algorithms. However, such studies suffer from a smaller rate and the direct photon signal must be disentangled from a large background of decay photons. We present jet reconstruction results which use an algorithm suitable for a high multiplicity environment. We also present results of two-particle correlations using direct photons. These results are discussed in the context of medium modification to the fragmentation function.

Matthew Nguyen for the PHENIX Collaboration

2010-08-08T23:59:59.000Z

468

Jet energy scale uncertainty correlations between ATLAS and CMS  

E-Print Network [OSTI]

The correlation of the jet energy scale uncertainties between the ATLAS and CMS experiments are presented in this note. The uncertainty components for both experiments are grouped in categories. For each of these categories, the detailed comparison of the procedures to determine the jet calibration and its uncertainties allows to estimate a range for the correlation coefficient between the two experiments, ranging from 0 (uncorrelated) to 100\\% (fully correlated). This information can be used for the combination of ATLAS and CMS precision measurements.

The ATLAS collaboration

2014-01-01T23:59:59.000Z

469

A General Relativistic Magnetohydrodynamics Simulation of Jet Formation  

E-Print Network [OSTI]

We have performed a fully three-dimensional general relativistic magnetohydrodynamic (GRMHD) simulation of jet formation from a thin accretion disk around a Schwarzschild black hole with a free-falling corona. The initial simulation results show that a bipolar jet (velocity $\\sim 0.3c$) is created as shown by previous two-dimensional axisymmetric simulations with mirror symmetry at the equator. The 3-D simulation ran over one hundred light-crossing time units ($\\tau_{\\rm S} = r_{\\rm S}/c$ where $r_{\\rm S} \\equiv 2GM/c^2$) which is considerably longer than the previous simulations. We show that the jet is initially formed as predicted due in part to magnetic pressure from the twisting the initially uniform magnetic field and from gas pressure associated with shock formation in the region around $r = 3 r_{\\rm S}$. At later times, the accretion disk becomes thick and the jet fades resulting in a wind that is ejected from the surface of the thickened (torus-like) disk. It should be noted that no streaming matter from a donor is included at the outer boundary in the simulation (an isolated black hole not binary black hole). The wind flows outwards with a wider angle than the initial jet. The widening of the jet is consistent with the outward moving torsional Alfv\\'{e}n waves (TAWs). This evolution of disk-jet coupling suggests that the jet fades with a thickened accretion disk due to the lack of streaming material from an accompanying star.

K. -I. Nishikawa; G. Richardson; S. Koide; K. Shibata; T. Kudoh; P. Hardee; G. J. Fishman

2004-03-01T23:59:59.000Z

470

Jet plume injection and combustion system for internal combustion engines  

DOE Patents [OSTI]

An improved combustion system for an internal combustion engine is disclosed wherein a rich air/fuel mixture is furnished at high pressure to one or more jet plume generator cavities adjacent to a cylinder and then injected through one or more orifices from the cavities into the head space of the cylinder to form one or more turbulent jet plumes in the head space of the cylinder prior to ignition of the rich air/fuel mixture in the cavity of the jet plume generator. The portion of the rich air/fuel mixture remaining in the cavity of the generator is then ignited to provide a secondary jet, comprising incomplete combustion products which are injected into the cylinder to initiate combustion in the already formed turbulent jet plume. Formation of the turbulent jet plume in the head space of the cylinder prior to ignition has been found to yield a higher maximum combustion pressure in the cylinder, as well as shortening the time period to attain such a maximum pressure.

Oppenheim, Antoni K. (Kensington, CA); Maxson, James A. (Berkeley, CA); Hensinger, David M. (Albany, CA)

1993-01-01T23:59:59.000Z

471

Transverse liquid fuel jet breakup, burning, and ignition  

SciTech Connect (OSTI)

An analytical/numerical study of the breakup, burning, and ignition of liquid fuels injected transversely into a hot air stream is conducted. The non-reacting liquid jet breakup location is determined by the local sonic point criterion first proposed by Schetz, et al. (1980). Two models, one employing analysis of an elliptical jet cross-section and the other employing a two-dimensional blunt body to represent the transverse jet, have been used for sonic point calculations. An auxiliary criterion based on surface tension stability is used as a separate means of determining the breakup location. For the reacting liquid jet problem, a diffusion flame supported by a one-step chemical reaction within the gaseous boundary layer is solved along the ellipse surface in subsonic crossflow. Typical flame structures and concentration profiles have been calculated for various locations along the jet cross-section as a function of upstream Mach numbers. The integrated reaction rate along the jet cross-section is used to predict ignition position, which is found to be situated near the stagnation point. While a multi-step reaction is needed to represent the ignition process more accurately, the present calculation does yield reasonable predictions concerning ignition along a curved surface.

Li, H.

1990-01-01T23:59:59.000Z

472

Transverse liquid fuel jet breakup, burning, and ignition  

SciTech Connect (OSTI)

An analytical/numerical study of the breakup, burning, and ignition of liquid fuels injected transversely into a hot air stream is conducted. The non-reacting liquid jet breakup location is determined by the local sonic point criterion first proposed by Schetz, et al. (1980). Two models, one employing analysis of an elliptical jet cross-section and the other employing a two-dimensional blunt body to represent the transverse jet, have been used for sonic point calculations. An auxiliary criterion based on surface tension stability is used as a separate means of determining the breakup location. For the reacting liquid jet problem, a diffusion flame supported by a one-step chemical reaction within the gaseous boundary layer is solved along the ellipse surface in subsonic crossflow. Typical flame structures and concentration profiles have been calculated for various locations along the jet cross-section as a function of upstream Mach numbers. The integrated reaction rate along the jet cross-section is used to predict ignition position, which is found to be situated near the stagnation point. While a multi-step reaction is needed to represent the ignition process more accurately, the present calculation does yield reasonable predictions concerning ignition along a curved surface.

Li, H.

1990-12-31T23:59:59.000Z

473

Jet conversions in a quark-gluon plasma  

SciTech Connect (OSTI)

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic q(q)g{yields}gq(q) and the inelastic qq{r_reversible}gg scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net of quark jets to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the p/{pi}{sup +} and p/{pi}{sup -} ratios at high transverse momentum. However, a much larger net quark-to-gluon jet conversion rate than the one given by the lowest order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at the same energy. Implications of our results are discussed.

Liu, W.; Ko, C. M.; Zhang, B. W. [Cyclotron Institute and Physics Department, Texas A and M University, College Station, Texas 77843-3366 (United States)

2007-05-15T23:59:59.000Z

474

Inclusive Jet Spectra in p-Pb Collisions at ALICE  

E-Print Network [OSTI]

Jet suppression has been observed in central heavy ion collisions. This suppression is attributed to partonic energy loss in the Quark Gluon Plasma (QGP) formed in such collisions. However, this measurement is influenced by all stages of the collision. It is expected that in p-Pb collisions similar initial conditions occur as in Pb-Pb collisions without creating a QGP, allowing modification to the jet spectra due to cold nuclear matter effects to be quantified. Inclusive jet spectra in p-Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV measured by ALICE are presented. Jets are reconstructed via the anti-k$_{\\rm T}$ algorithm with different resolution parameters by combining charged tracks measured in the ALICE tracking system with the neutral energy deposited in the electromagnetic calorimeter. The jet spectra can be used to determine a nuclear modification factor $R_{\\rm pPb}$ while the jet profile in p-Pb is studied by dividing spectra measured with different resolution parameters and comparing to the same ratio measured in pp collisions.

Megan Connors; for the ALICE Collaboration

2014-09-11T23:59:59.000Z

475

Measurements of Vector Bosons Produced in Association with Jets  

SciTech Connect (OSTI)

The latest D0 and CDF measurements of the W + jets and Z/{gamma}* + jets processes are described, along with a discussion of the comparisons that have been made to LO and NLO perturbative QCD predictions. The direct production of W{sup {+-}}/Z bosons in association with jets is a process of crucial importance at hadron collider experiments. The presence of a vector boson in the hard scatter means that these interactions occur at a scale that should make perturbative QCD applicable, and thus it is an excellent channel to test such predictions. Furthermore, many of the potential discovery channels for the Higgs boson and beyond standard model processes share a final state signature with the W{sup {+-}}/Z + jets process. It is thus vital for the success of existing and future hadron collider experiments that this process is understood, and recently there has been a huge amount of work put into the modeling of this process, with the appearance of many new Monte Carlo generators that are already widely used at both the Tevatron and LHC. In Sections 2 and 3 the latest W + jets and Z/{gamma}* + jets measurements from the Tevatron are presented, and in Section 4 we discuss the results and implications of some of the theory comparisons that have thus far been made.

Cooper, Ben; /University Coll. London

2008-07-01T23:59:59.000Z

476

COUNTERROTATION IN MAGNETOCENTRIFUGALLY DRIVEN JETS AND OTHER WINDS  

SciTech Connect (OSTI)

Rotation measurement in jets from T Tauri stars is a rather difficult task. Some jets seem to be rotating in a direction opposite to that of the underlying disk, although it is not yet clear if this affects the totality or part of the outflows. On the other hand, Ulysses data also suggest that the solar wind may rotate in two opposite ways between the northern and southern hemispheres. We show that this result is not as surprising as it may seem and that it emerges naturally from the ideal MHD equations. Specifically, counterrotating jets neither contradict the magnetocentrifugal driving of the flow nor prevent extraction of angular momentum from the disk. The demonstration of this result is shown by combining the ideal MHD equations for steady axisymmetric flows. Provided that the jet is decelerated below some given threshold beyond the Alfven surface, the flow will change its direction of rotation locally or globally. Counterrotation is also possible for only some layers of the outflow at specific altitudes along the jet axis. We conclude that the counterrotation of winds or jets with respect to the source, star or disk, is not in contradiction with the magnetocentrifugal driving paradigm. This phenomenon may affect part of the outflow, either in one hemisphere, or only in some of the outflow layers. From a time-dependent simulation, we illustrate this effect and show that it may not be permanent.

Sauty, C.; Cayatte, V. [Laboratoire Univers et Theories, Observatoire de Paris, UMR 8102 du CNRS, Universite Paris Diderot, F-92190 Meudon (France); Lima, J. J. G. [Centro de Astrofisica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto (Portugal); Matsakos, T. [CEA, IRAMIS, Service Photons, Atomes et Molecules, F-91191 Gif-sur-Yvette (France); Tsinganos, K., E-mail: christophe.sauty@obspm.fr [IASA and Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, Panepistimiopolis GR-157 84, Zografos (Greece)

2012-11-01T23:59:59.000Z

477

Pulse Jet Mixing Tests With Noncohesive Solids  

SciTech Connect (OSTI)

This report summarizes results from pulse jet mixing (PJM) tests with noncohesive solids in Newtonian liquid conducted during FY 2007 and 2008 to support the design of mixing systems for the Hanford Waste Treatment and Immobilization Plant (WTP). Tests were conducted at three geometric scales using noncohesive simulants. The test data were used to independently develop mixing models that can be used to predict full-scale WTP vessel performance and to rate current WTP mixing system designs against two specific performance requirements. One requirement is to ensure that all solids have been disturbed during the mixing action, which is important to release gas from the solids. The second requirement is to maintain a suspended solids concentration below 20 weight percent at the pump inlet. The models predict the height to which solids will be lifted by the PJM action, and the minimum velocity needed to ensure all solids have been lifted from the floor. From the cloud height estimate we can calculate the concentration of solids at the pump inlet. The velocity needed to lift the solids is slightly more demanding than "disturbing" the solids, and is used as a surrogate for this metric. We applied the models to assess WTP mixing vessel performance with respect to the two perform¬ance requirements. Each mixing vessel was evaluated against these two criteria for two defined waste conditions. One of the wastes was defined by design limits and one was derived from Hanford waste characterization reports. The assessment predicts that three vessel types will satisfy the design criteria for all conditions evaluated. Seven vessel types will not satisfy the performance criteria used for any of the conditions evaluated. The remaining three vessel types provide varying assessments when the different particle characteristics are evaluated. The assessment predicts that three vessel types will satisfy the design criteria for all conditions evaluated. Seven vessel types will not satisfy the performance criteria used for any of the conditions evaluated. The remaining three vessel types provide varying assessments when the different particle characteristics are evaluated. The HLP-022 vessel was also evaluated using 12 m/s pulse jet velocity with 6-in. nozzles, and this design also did not satisfy the criteria for all of the conditions evaluated.

Meyer, Perry A.; Bamberger, Judith A.; Enderlin, Carl W.; Fort, James A.; Wells, Beric E.; Sundaram, S. K.; Scott, Paul A.; Minette, Michael J.; Smith, Gary L.; Burns, Carolyn A.; Greenwood, Margaret S.; Morgen, Gerald P.; Baer, Ellen BK; Snyder, Sandra F.; White, Michael; Piepel, Gregory F.; Amidan, Brett G.; Heredia-Langner, Alejandro; Bailey, Sharon A.; Bower, John C.; Denslow, Kayte M.; Eakin, David E.; Elmore, Monte R.; Gauglitz, Phillip A.; Guzman, Anthony D.; Hatchell, Brian K.; Hopkins, Derek F.; Hurley, David E.; Johnson, Michael D.; Kirihara, Leslie J.; Lawler, Bruce D.; Loveland, Jesse S.; Mullen, O Dennis; Pekour, Mikhail S.; Peters, Timothy J.; Robinson, Peter J.; Russcher, Michael S.; Sande, Susan; Santoso, Christian; Shoemaker, Steven V.; Silva, Steve M.; Smith, Devin E.; Su, Yin-Fong; Toth, James J.; Wiberg, John D.; Yu, Xiao-Ying; Zuljevic, Nino

2009-05-11T23:59:59.000Z

478

Zonal Flow as Pattern Formation: Merging Jets and the Ultimate Jet Length Scale  

SciTech Connect (OSTI)

Zonal flows are well known to arise spontaneously out of turbulence. It is shown that for statisti- cally averaged equations of quasigeostrophic turbulence on a beta plane, zonal flows and inhomoge- neous turbulence fit into the framework of pattern formation. There are many implications. First, the zonal flow wavelength is not unique. Indeed, in an idealized, infinite system, any wavelength within a certain continuous band corresponds to a solution. Second, of these wavelengths, only those within a smaller subband are linearly stable. Unstable wavelengths must evolve to reach a stable wavelength; this process manifests as merging jets.

Jeffrey B. Parker and John A. Krommes

2013-01-30T23:59:59.000Z

479

Operations of a Radioisotope-based Propulsion System Enabling CubeSat Exploration of the Outer Planets  

SciTech Connect (OSTI)

Exploration to the outer planets is an ongoing endeavor but in the current economical environment, cost reduction is the forefront of all concern. The success of small satellites such as CubeSats launched to Near-Earth Orbit has lead to examine their potential use to achieve cheaper science for deep space applications. However, to achieve lower cost missions; hardware, launch and operations costs must be minimized. Additionally, as we push towards smaller exploration beds with relative limited power sources, allowing for adequate communication back to Earth is imperative. Researchers at the Center for Space Nuclear Research are developing the potential of utilizing an advanced, radioisotope-based system. This system will be capable of providing both the propulsion power needed to reach the destination and the additional requirements needed to maintain communication while at location. Presented here are a basic trajectory analysis, communication link budget and concept of operations of a dual-mode (thermal and electric) radioisotope-based propulsion system, for a proposed mission to Enceladus (Saturnian icy moon) using a 6U CubeSat payload. The radioisotope system being proposed will be the integration of three sub-systems working together to achieve the overall mission. At the core of the system, stored thermal energy from radioisotope decay is transferred to a passing propellant to achieve high thrust – useful for quick orbital maneuvering. An auxiliary closed-loop Brayton cycle can be operated in parallel to the thrusting mode to provide short bursts of high power for high data-rate communications back to Earth. Additionally, a thermal photovoltaic (TPV) energy conversion system will use radiation heat losses from the core. This in turn can provide the electrical energy needed to utilize the efficiency of ion propulsion to achieve quick interplanetary transit times. The intelligent operation to handle all functions of this system under optimized conditions adds to the complexity of the mission architecture.

Dr. Steven Howe; Nathan Jerred; Troy Howe; Adarsh Rajguru

2014-05-01T23:59:59.000Z

480

A 'BOOSTED FIREBALL' MODEL FOR STRUCTURED RELATIVISTIC JETS  

SciTech Connect (OSTI)

We present a model for relativistic jets which generates a particular angular distribution of Lorentz factor and energy per solid angle. We consider a fireball with specific internal energy E/M launched with bulk Lorentz factor ? {sub B}. In its center-of-momentum frame the fireball expands isotropically, converting its internal energy into radially expanding flow with asymptotic Lorentz factor ?{sub 0} ? E/M. In the lab frame the flow is beamed, expanding with Lorentz factor ? = 2?{sub 0}? {sub B} in the direction of its initial bulk motion and with characteristic opening angle ?{sub 0} ? 1/? {sub B}. The flow is jet-like with ??{sub 0} ? 2?{sub 0} such that jets with ? > 1/?{sub 0} are naturally produced. The choice ?{sub 0} ? ? {sub B} ? 10 yields a jet with ? ? 200 on-axis and angular structure characterized by opening angle ?{sub 0} ? 0.1 of relevance for cosmological gamma-ray bursts (GRBs), while ? {sub B} ?> 1 may be relevant for low-luminosity GRBs. The model produces a family of outflows, of relevance for different relativistic phenomena with structures completely determined by ?{sub 0} and ? {sub B}. We calculate the energy per unit solid angle for the model and use it to compute light curves for comparison with the widely used top-hat model. The jet break in the boosted fireball light curve is greatly subdued when compared to the top-hat model because the edge of the jet is smoother than for a top-hat. This may explain missing jet breaks in afterglow light curves.

Duffell, Paul C.; MacFadyen, Andrew I., E-mail: pcd233@nyu.edu, E-mail: macfadyen@nyu.edu [Center for Cosmology and Particle Physics, New York University, NY (United States)

2013-10-10T23:59:59.000Z

Note: This page contains sample records for the topic "jordana jet propulsion" from the National Library of EnergyBeta (NLEBeta).
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481

Measurement of the ratio of inclusive cross sections ?(pp¯?Z+b-quark jet)/?(pp¯?Z+jet) at s=1.96??TeV  

Science Journals Connector (OSTI)

The ratio of the cross section for pp¯ interactions producing a Z boson and at least one b-quark jet to the inclusive Z+jet cross section is measured using 4.2??fb-1 of pp¯ collisions collected with the D0 detector at the Fermilab Tevatron collider at s=1.96??TeV. The Z??+?- candidate events with at least one b jet are discriminated from Z+charm and light jet(s) events by a novel technique that exploits the properties of the tracks associated to the jet. The measured ratio is 0.0193±0.0027 for events having a jet with transverse momentum pT>20??GeV and pseudorapidity |?|?2.5, which is the most precise to date and is consistent with theoretical predictions.

V. M. Abazov et al. (D0 Collaboration)

2011-02-28T23:59:59.000Z

482

Development of Liquid-Vapor Core Reactors with MHD Generator for Space Power and Propulsion Applications  

SciTech Connect (OSTI)

Any reactor that utilizes fuel consisting of a fissile material in a gaseous state may be referred to as a gaseous core reactor (GCR). Studies on GCRs have primarily been limited to the conceptual phase, mostly due to budget cuts and program cancellations in the early 1970's. A few scientific experiments have been conducted on candidate concepts, primarily of static pressure fissile gas filling a cylindrical or spherical cavity surrounded by a moderating shell, such as beryllium, heavy water, or graphite. The main interest in this area of nuclear power generation is for space applications. The interest in space applications has developed due to the promise of significant enhancement in fuel utilization, safety, plant efficiency, special high-performance features, load-following capabilities, power conversion optimization, and other key aspects of nuclear power generation. The design of a successful GCR adapted for use in space is complicated. The fissile material studied in the pa st has been in a fluorine compound, either a tetrafluoride or a hexafluoride. Both of these molecules have an impact on the structural material used in the making of a GCR. Uranium hexafluoride as a fuel allows for a lower operating temperature, but at temperatures greater than 900K becomes essentially impossible to contain. This difficulty with the use of UF6 has caused engineers and scientists to use uranium tetrafluoride, which is a more stable molecule but has the disadvantage of requiring significantly higher operating temperatures. Gas core reactors have traditionally been studied in a steady state configuration. In this manner a fissile gas and working fluid are introduced into the core, called a cavity, that is surrounded by a reflector constructed of materials such as Be or BeO. These reactors have often been described as cavity reactors because the density of the fissile gas is low and criticality is achieved only by means of the reflector to reduce neutron leakage from the core. Still there are problems of containment since many of the proposed vessel materials such as W or Mo have high neutron cross sections making the design of a critical system difficult. There is also the possibility for a GCR to remain in a subcritical state, and by the use of a shockwave mechanism, increase the pressure and temperature inside the core to achieve criticality. This type of GCR is referred to as a shockwave-driven pulsed gas core reactor. These two basic designs were evaluated as advance concepts for space power and propulsion.

Samim Anghaie

2002-08-13T23:59:59.000Z

483

Pulse Jet Mixing Tests With Noncohesive Solids  

SciTech Connect (OSTI)

This report summarizes results from pulse jet mixing (PJM) tests with noncohesive solids in Newtonian liquid. The tests were conducted during FY 2007 and 2008 to support the design of mixing systems for the Hanford Waste Treatment and Immobilization Plant (WTP). Tests were conducted at three geometric scales using noncohesive simulants, and the test data were used to develop models predicting two measures of mixing performance for full-scale WTP vessels. The models predict the cloud height (the height to which solids will be lifted by the PJM action) and the critical suspension velocity (the minimum velocity needed to ensure all solids are suspended off the floor, though not fully mixed). From the cloud height, the concentration of solids at the pump inlet can be estimated. The predicted critical suspension velocity for lifting all solids is not precisely the same as the mixing requirement for 'disturbing' a sufficient volume of solids, but the values will be similar and closely related. These predictive models were successfully benchmarked against larger scale tests and compared well with results from computational fluid dynamics simulations. The application of the models to assess mixing in WTP vessels is illustrated in examples for 13 distinct designs and selected operational conditions. The values selected for these examples are not final; thus, the estimates of performance should not be interpreted as final conclusions of design adequacy or inadequacy. However, this work does reveal that several vessels may require adjustments to design, operating features, or waste feed properties to ensure confidence in operation. The models described in this report will prove to be valuable engineering tools to evaluate options as designs are finalized for the WTP. Revision 1 refines data sets used for model development and summarizes models developed since the completion of Revision 0.

Meyer, Perry A.; Bamberger, Judith A.; Enderlin, Carl W.; Fort, James A.; Wells, Beric E.; Sundaram, S. K.; Scott, Paul A.; Minette, Michael J.; Smith, Gary L.; Burns, Carolyn A.; Greenwood, Margaret S.; Morgen, Gerald P.; Baer, Ellen BK; Snyder, Sandra F.; White, Michael K.; Piepel, Gregory F.; Amidan, Brett G.; Heredia-Langner, Alejandro

2012-02-17T23:59:59.000Z

484

Jet Noise Contribution to Wind Noise in Vehicles  

Science Journals Connector (OSTI)

A source of “wind noise” in a vehicle with a slightly opened window has been modeled as a slit jet issuing from a plenum (idealized vehicle). The nondimensional power spectra measured inside and outside were quite similar; the curves collapsed together well when plotted against Strouhal number fD/U (f=frequency D=slit width U=jet nozzle velocity). The higher frequency sources of the jet noise being closer to the slit subtend a larger angle and would be expected to transmit more noise into the plenum. This expectation was confirmed with inward transmission increasing with both frequency and slit width; at 10 000 Hz and 1.5?in. slit width (maxima for these experiments with 80?fps jet velocity) the jet noise power transmitted inward through the slit reached 68% of the power emitted externally in the 1 3 ? oct band. These were exploratory tests and there was no external wind. [Work supported by Air Force Office of Scientific Research.

C.?K. A. Yu; H. S. Ribner

1971-01-01T23:59:59.000Z

485

Implementation And Performance of the ATLAS Second Level Jet Trigger  

SciTech Connect (OSTI)

ATLAS is one of the four major LHC experiments, designed to cover a wide range of physics topics. In order to cope with a rate of 40MHz and 25 interactions per bunch crossing, the ATLAS trigger system is divided in three different levels. The jet selection starts at first level with dedicated processors that search for high E{sub T} hadronic energy depositions. At the LVL2, the jet signatures are verified with the execution of a dedicated, fast jet reconstruction algorithm, followed by a calibration algorithm. Three possible granularities have been proposed and are being evaluated: cell based (standard), energy sums calculated at each Front-End Board and the use of the LVL1 Trigger Towers. In this presentation, the design and implementation of the jet trigger of ATLAS will be discussed in detail, emphasazing the major difficulties of each selection step. The performance of the jet algorithm, including timing, efficiencies and rates will also be shown, with detailed comparisons of the different unpacking modes.

Conde Muino, Patricia; /Lisbon, LIFEP; Aracena, I.; /SLAC; Brelier, B.; /Montreal U.; Cranmer, K.; /Brookhaven; Delsart, P.A.; /Montreal U.; Dufour, M.A.; /McGill U.; Eckweiler, S.; /Mainz U., Inst. Phys.; Ferland, J.; /Montreal U.; Idarraga, J.; /Montreal U.; Johns, K.; /Arizona U.; LeCompte, T.; /Argonne; Potter, C.; Robertson, S.; Santamarina Rios, C.; /McGill U.; Segura, E.; /Barcelona, IFAE; Silverstein, D.; /SLAC; Vachon, B.; /McGill U.

2011-11-09T23:59:59.000Z

486

Jet conversions in a quark-gluon plasma  

E-Print Network [OSTI]

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic $q(\\bar q)g\\to gq(\\bar q)$ and the inelastic $q\\bar q\\leftrightarrow gg$ scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net conversion of quark to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the $p/\\pi^+$ and ${\\bar p}/\\pi^-$ ratios at high transverse momentum. However, a much larger net quark to gluon jet conversion rate than the one given by the lowest-order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at same energy. Implications of our results are discussed.

W. Liu; C. M. Ko; B. W. Zhang

2006-07-21T23:59:59.000Z

487

The response of the Red Sea to a strong wind jet near the Tokar Gap in summer.  

E-Print Network [OSTI]

??Remote sensing and in situ observations are used to investigate the ocean response to the Tokar Wind Jet in the Red Sea. The wind jet… (more)

Zhai, Ping

2011-01-01T23:59:59.000Z

488

11/30/2006 02:40 PMUnderwater Times | Scientists Make, Mate Robot Tadpoles to Prove Propulsion Theory Page 1 of 3http://www.underwatertimes.com/news.php?article_id=79185432601  

E-Print Network [OSTI]

11/30/2006 02:40 PMUnderwater Times | Scientists Make, Mate Robot Tadpoles to Prove Propulsion change) Privacy Information Related Stories Scientists Make, Mate Robot Tadpoles to Prove Propulsion -- "Tadros" -- were modeled after the larvae of marine animals known as sea squirts, swimming creatures

Long Jr., John H.

489

A new symbiotic evolution-based fuzzy-neural approach to fault diagnosis of marine propulsion systems  

Science Journals Connector (OSTI)

This paper presents a symbiotic evolution-based fuzzy-neural diagnostic system (SE-FNDS) for fault diagnosis of propeller–shaft marine propulsion systems. The SE-FNDS combination of fuzzy modeling, back-propagation training and symbiotic evolution function auto-generates its own optimal fuzzy-neural architecture, a significant advantage over previous time-consuming manual parameter determination. Four hundred samples from a test propeller–shaft system are taken over a range of 100–500 rpm, during normal and experimentally induced faulty operation. This database is applied as input/output rule generation and training data for the fuzzy-neural network. Comparison of system construction time and diagnostic accuracy is made by applying the same database to SE-FNDS and four traditional systems. Compared to traditional methods, diagnostic decisions from SE-FNDS show 94.17% agreement with real conditions and less CPU time for system construction. Two nonlinear function approximations are also used to demonstrate the proposed system. The presented design is useful as a core module for more advanced computer-assisted diagnostic systems and for direct application in marine propulsion systems.

Hsing-Chia Kuo; Hui-Kuo Chang

2004-01-01T23:59:59.000Z

490

Heavy vehicle propulsion system materials program semi-annual progress report for October 1997 through March 1998  

SciTech Connect (OSTI)

The purpose of the Heavy Vehicle Propulsion System materials Program is the development of materials: ceramics, intermetallics, metal alloys, and metal and ceramic coatings, to support the dieselization of class 1--3 trucks to realize a 35{percent} fuel-economy improvement over current gasoline-fueled trucks and to support commercialization of fuel-flexible LE-55 low-emissions, high-efficiency diesel engines for class 7--8 trucks. The Office of Transportation Technologies, Office of Heavy Vehicle Technologies (OTT OHVT) has an active program to develop the technology for advanced LE-55 diesel engines with 55{percent} efficiency and low emissions levels of 2.0 g/bhp-h NO{sub x} and 0.05 g/bhp-h particulates. The goal is also for the LE-55 engine to run on natural gas with efficiency approaching that of diesel fuel. The LE-55 program is being completed in FY 1997 and, after approximately 10 years of effort, has largely met the program goals of 55{percent} efficiency and low emissions. However, the commercialization of the LE-55 technology requires more durable materials than those that have been used to demonstrate the goals. Heavy Vehicle Propulsion System Materials will, in concert with the heavy-duty diesel engine companies, develop the durable materials required to commercialize the LE-55 technologies.

Johnson, D.R.

1998-06-01T23:59:59.000Z

491

RADIOISOTOPE-DRIVEN DUAL-MODE PROPULSION SYSTEM FOR CUBESAT-SCALE PAYLOADS TO THE OUTER PLANETS  

SciTech Connect (OSTI)

It is apparent the cost of planetary exploration is rising as mission budgets declining. Currently small scientific beds geared to performing limited tasks are being developed and launched into low earth orbit (LEO) in the form of small-scale satellite units, i.e., CubeSats. These micro- and nano-satellites are gaining popularity among the university and science communities due to their relatively low cost and design flexibility. To date these small units have been limited to performing tasks in LEO utilizing solar-based power. If a reasonable propulsion system could be developed, these CubeSat platforms could perform exploration of various extra-terrestrial bodies within the solar system engaging a broader range of researchers. Additionally, being mindful of mass, smaller cheaper launch vehicles (approximately 1,000 kgs to LEO) can be targeted. Thus, in effect, allows for beneficial exploration to be conducted within limited budgets. Researchers at the Center for Space Nuclear Research (CSNR) are proposing a low mass, radioisotope-based, dual-mode propulsion system capable of extending the exploration realm of these CubeSats out of LEO.

N. D. Jerred; T. M. Howe; S. D. Howe; A. Rajguru

2014-02-01T23:59:59.000Z

492

Numerical simulation of a single emitter colloid thruster in pure droplet cone-jet mode  

E-Print Network [OSTI]

New Scientific missions call for emerging propulsion technologies capable of fine tuning a satellite's relative position and cancelling small disturbances. One candidate technology that holds promise for these type of ...

Carretero Benignos, Jorge Alejandro, 1972-

2005-01-01T23:59:59.000Z

493

An artificial neural network based $b$ jet identification algorithm at the CDF Experiment  

E-Print Network [OSTI]

We present the development and validation of a new multivariate $b$ jet identification algorithm ("$b$ tagger") used at the CDF experiment at the Fermilab Tevatron. At collider experiments, $b$ taggers allow one to distinguish particle jets containing $B$ hadrons from other jets. Employing feed-forward neural network architectures, this tagger is unique in its emphasis on using information from individual tracks. This tagger not only contains the usual advantages of a multivariate technique such as maximal use of information in a jet and tunable purity/efficiency operating points, but is also capable of evaluating jets with only a single track. To demonstrate the effectiveness of the tagger, we employ a novel method wherein we calculate the false tag rate and tag efficiency as a function of the placement of a lower threshold on a jet's neural network output value in $Z+1$ jet and $t\\bar{t}$ candidate samples, rich in light flavor and $b$ jets, respectively.

J. Freeman; W. Ketchum; J. D. Lewis; S. Poprocki; A. Pronko; V. Rusu; P. Wittich

2011-08-24T23:59:59.000Z

494

Mesoscale Convective Systems in Relation to African and Tropical Easterly Jets  

Science Journals Connector (OSTI)

This paper documents the interaction processes between mesoscale convective systems (MCS), the tropical easterly jet (TEJ), and the African easterly jet (AEJ) over West Africa during the monsoon peak of 2006 observed during the African Monsoon ...

L. Besson; Y. Lemaître

2014-09-01T23:59:59.000Z

495

Optimal dimensionless design and analysis of jet ejectors as compressors and thrust augmenters  

E-Print Network [OSTI]

A jet ejector may be used as a compressor or to enhance thrust of watercraft or aircraft. Optimization of jet ejectors as compressors and thrust augmenters was conducted using the software GAMBIT (Computer Aided Engineering (CAE) tool for geometry...

Mohan, Ganesh

2006-08-16T23:59:59.000Z

496

Distinguishing the Cold Conveyor Belt and Sting Jet Airstreams in an Intense Extratropical Cyclone  

Science Journals Connector (OSTI)

Strong winds equatorward and rearward of a cyclone core have often been associated with two phenomena: the cold conveyor belt (CCB) jet and sting jets. Here, detailed observations of the mesoscale structure in this region of an intense cyclone are ...

Oscar Martínez-Alvarado; Laura H. Baker; Suzanne L. Gray; John Methven; Robert S. Plant

2014-08-01T23:59:59.000Z

497

Capturing the Impact of Fuel Price on Jet Aircraft Operating Costs with Engineering and Econometric Models  

E-Print Network [OSTI]

Capturing the Impact of Fuel Price on Jet Aircraft OperatingCapturing the Impact of Fuel Price on Jet Aircraft Operatingare in part due to fuel price uncertainty. To address this

Smirti Ryerson, Megan; Hansen, Mark

2009-01-01T23:59:59.000Z

498

Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D  

E-Print Network [OSTI]

High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet ...

Hollmann, E. M.

499

On the ratio between shifts in the eddy-driven jet and the Hadley cell edge  

Science Journals Connector (OSTI)

This study explores the relationship between latitudinal shifts in the eddy-driven jet and in the Hadley cell edge as depicted in models and ... 1 between the eddy-driven jet and the Hadley cell edge over the Sou...

Paul W. Staten; Thomas Reichler

2014-03-01T23:59:59.000Z

500

Jet Production in ep Collisions at Low Q^2 and Determination of $\\alpha_{s}$  

E-Print Network [OSTI]

The production of jets is studied in deep-inelastic e+p scattering at low negative four momentum transfer squared 5jet, 2-jet and 3-jet cross sections as well as the ratio of 3-jet to 2-jet cross sections are measured as a function of Q^2 and jet transverse momentum. The 2-jet cross section is also measured as a function of the proton momentum fraction xi. The measurements are well described by perturbative quantum chromodynamics at next-to-leading order corrected for hadronisation effects and are subsequently used to extract the strong coupling alpha_s.

Aaron, FD; Alexa, C; Andreev, V; Antunovic, B; Backovic, S; Baghdasaryan, A; Barrelet, E; Bartel, W; Begzsuren, K; Belousov, A; Bizot, J C; Boudry, V; Bozovic-Jelisavcic, I; Bracinik, J; Brandt, G; Brinkmann, M; Brisson, V; Bruncko, D; Bunyatyan, A; Buschhorn, G; Bystritskaya, L; Campbell, A J; Cantun Avila, K B; Cerny, K; Cerny, V; Chekelian, V; Cholewa, A; Contreras, J G; Coughlan, J A; Cozzika, G; Cvach, J; Dainton, J B; Daum, K; Deak, M; Delcourt, B; Delvax, J; De Wolf, E A; Diaconu, C; Dodonov, V; Dossanov, A; Dubak, A; Eckerlin, G; Efremenko, V; Egli, S; Eliseev, A; Elsen, E; Falkiewicz, A; Favart, L; Fedotov, A; Felst, R; Feltesse, J; Ferencei, J; Fischer, D J; Fleischer, M; Fomenko, A; Gabathuler, E; Gayler, J; Ghazaryan, Samvel; Glazov, A; Glushkov, I; Goerlich, L; Gogitidze, N; Gouzevitch, M; Grab, C; Greenshaw, T; Grell, B R; Grindhammer, G; Habib, S; Haidt, D; Helebrant, C; Henderson, R C W; Hennekemper, E; Henschel, H; Herbst, M; Herrera, G; Hildebrandt, M; Hiller, K H; Hoffmann, D; Horisberger, R; Hreus, T; Jacquet, M; Janssen, X; Jonsson, L; Jung, A W; Jung, H; Kapichine, M; Katzy, J; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Kluge, T; Knutsson, A; Kogler, R; Kosior, E; Kostka, P; Kraemer, M; Krastev, K; Kretzschmar, J; Kropivnitskaya, A; Kruger, K; Kutak, K; Landon, M P J; Lange, W; Lastovicka-Medin, G; Laycock, P; Lebedev, A; Lendermann, V; Levonian, S; Li, G; Lipka, K; Liptaj, A; List, B; List, J; Loktionova, N; Lopez-Fernandez, R; Lubimov, V; Makankine, A; Malinovski, E; Marage, P; Marti, Ll; Martyn, H U; Maxfield, S J; Mehta, A; Meyer, A B; Meyer, H; Meyer, H; Meyer, J; Mikocki, S; Milcewicz-Mika, I; Moreau, F; Morozov, A; Morris, J V; Mozer, M U; Mudrinic, M; Muller, K; Murin, P; Naumann, Th; Newman, P R; Niebuhr, C; Nikiforov, A; Nikitin, D; Nowak, G; Nowak, K; Olsson, J E; Osman, S; Ozerov, D; Palichik, V; Panagoulias, I; Pandurovic, M; Papadopoulou, Th; Pascaud, C; Patel, G D; Pejchal, O; Perez, E; Petrukhin, A; Picuric, I; Piec, S; Pitzl, D; Placakyte, R; Pokorny, B; Polifka, R; Povh, B; Radescu, V; Rahmat, A J; Raicevic, N; Raspiareza, A; Ravdandorj, T; Reimer, P; Rizvi, E; Robmann, P; Roland, B; Roosen, R; Rostovtsev, A; Rotaru, M; Tabasco, J E Ruiz; Rusakov, S; Salek, D; Sankey, D P C; Sauter, M; Sauvan, E; Schmitt, S; Schoeffel, L; Schoning, A; Schultz-Coulon, H C; Sefkow, F; Shaw-West, R N; Shtarkov, L N; Shushkevich, S; Sloan, T; Smiljanic, Ivan; Soloviev, Y; Sopicki, P; South, D; Spaskov, V; Specka, A; Staykova, Z; Steder, M; Stella, B; Stoicea, G; Straumann, U; Sunar, D; Sykora, T; Tchoulakov, V; Thompson, G; Thompson, P D; Toll, T; Tomasz, F; Tran, T H; Traynor, D; Trinh, T N; Truol, P; Tsakov, I; Tseepeldorj, B; Turnau, J; Urban, K; Valkarova, A; Vallee, C; Van Mechelen, P; Trevino, A Vargas; Vazdik, Y; Vinokurova, S; Volchinski, V; von den Driesch, M; Wegener, D; Wissing, Ch; Wunsch, E; Zacek, J; Zalesak, J; Zhang, Z; Zhokin, A; Zimmermann, T; Zohrabyan, H; Zomer, F

2010-01-01T23:59:59.000Z