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Note: This page contains sample records for the topic "wave travel time" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


1

Recent developments in guided wave travel time tomography  

SciTech Connect

The concept of predictive maintenance using permanent sensors that monitor the integrity of an installation is an interesting addition to the current method of periodic inspections. Guided wave tomography had been developed to create a map of the wall thickness using the travel times of guided waves. It can be used for both monitoring and for inspection of pipe-segments that are difficult to access, for instance at the location of pipe-supports. An important outcome of the tomography is the minimum remaining wall thickness, as this is critical in the scheduling of a replacement of the pipe-segment. In order to improve the sizing accuracy we have improved the tomography scheme. A number of major improvements have been realized allowing to extend the application envelope to pipes with a larger wall thickness and to larger distances between the transducer rings. Simulation results indicate that the sizing accuracy has improved and that is now possible to have a spacing of 8 meter between the source-ring and the receiver-ring. Additionally a reduction of the number of sensors required might be possible as well.

Zon, Tim van; Volker, Arno [TNO, Stieltjesweg 1, P.O. box 155 2600 AD Delft (Netherlands)

2014-02-18T23:59:59.000Z

2

Time domain analysis of a gyrotron traveling wave amplifier with misaligned electron beam  

SciTech Connect

This article develops a time-domain theory to study the beam-wave interaction in gyrotron traveling wave amplifier (gyro-TWA) with a misaligned electron beam. The effects of beam misalignment on the TE{sub 01} mode gyro-TWA operating at the fundamental are discussed. Numerical results show that the effect of misalignment is less obvious when the input power is larger, and the influences of misalignment on the stable gain and the stable time are basically opposite.

Wang, Qiushi, E-mail: qiushiwork@gmail.com; Peng, Shuyuan [Institute of Electronics, Chinese Academy of Sciences, P.O. Box 2652, Beijing 100080 (China); University of Chinese Academy of Sciences, Beijing 100039 (China); Luo, Jirun [Institute of Electronics, Chinese Academy of Sciences, P.O. Box 2652, Beijing 100080 (China)

2014-08-15T23:59:59.000Z

3

S-wave travel times for a spherically averaged earth  

Science Journals Connector (OSTI)

......and only accurate to two decimal places (Watson 1956). When the test is used to check...S ) CMC OTT COL WES SFA HNME SCH RES FBC MBC NPNT G HB G HB HB G HB HB HB HB G 30...from differential shear wave measure- Watson, G. S., 1956. Analysis of dispersion......

Robert Uhrhammer

1978-11-01T23:59:59.000Z

4

Traveling-wave photodetector  

SciTech Connect

The traveling-wave photodetector of the present invention combines an absorptive optical waveguide and an electrical transmission line, in which optical absorption in the waveguide results in a photocurrent at the electrodes of the electrical transmission line. The optical waveguide and electrical transmission line of the electrically distributed traveling-wave photodetector are designed to achieve matched velocities between the light in the optical waveguide and electrical signal generated on the transmission line. This velocity synchronization provides the traveling-wave photodetector with a large electrical bandwidth and a high quantum efficiency, because of the effective extended volume for optical absorption. The traveling-wave photodetector also provides large power dissipation, because of its large physical size.

Hietala, V.M.; Vawter, G.A.

1992-12-31T23:59:59.000Z

5

An analysis of the travel times of S waves to North American stations in the distance range 28° to 82°  

Science Journals Connector (OSTI)

...i o-,.s ~.... ~ ,, ~ ,,/ \\Lt ~ ..... o'~ ', ,' , t / -%, o WWSS stoflons \\ / \\ \\ = CaHech slo'iions 1.6 Fzo. 2. Map of S Residuals for.U.S. Stations. TRAVEL TIMES OF S WAVES 767 l I I I I I I I I I I I i I I x x I...

H. A. Doyle; A. L. Hales

6

Earthquake Damage Detection in the Imperial County Services Building III: Analysis of Wave Travel Times via Impulse Response Functions  

E-Print Network (OSTI)

, one such method is explored using strong motion data from the 1979 Imperial Valley Earthquake recorded1 Earthquake Damage Detection in the Imperial County Services Building III: Analysis of Wave Travel in the former Imperial County Services (ICS) Building, severely damaged by this earthquake. Shear wave travel

Southern California, University of

7

Time-lapse travel time change of multiply scattered acoustic waves  

E-Print Network (OSTI)

of applications where detecting temporal changes may be useful include the monitoring of volcanoes, oil reservoirs time-lapse changes in the oil reservoir caused by a massive miscible CO2 flood to enhance oil recovery heterogeneous reservoirs. © 2005 Acoustical Society of America. DOI: 10.1121/1.2000827 PACS number s : 43.20.Fn

Snieder, Roel

8

Sequentially pulsed traveling wave accelerator  

DOE Patents (OSTI)

A sequentially pulsed traveling wave compact accelerator having two or more pulse forming lines each with a switch for producing a short acceleration pulse along a short length of a beam tube, and a trigger mechanism for sequentially triggering the switches so that a traveling axial electric field is produced along the beam tube in synchronism with an axially traversing pulsed beam of charged particles to serially impart energy to the particle beam.

Caporaso, George J. (Livermore, CA); Nelson, Scott D. (Patterson, CA); Poole, Brian R. (Tracy, CA)

2009-08-18T23:59:59.000Z

9

Topological horseshoes in travelling waves of discretized nonlinear wave equations  

SciTech Connect

Applying the concept of anti-integrable limit to coupled map lattices originated from space-time discretized nonlinear wave equations, we show that there exist topological horseshoes in the phase space formed by the initial states of travelling wave solutions. In particular, the coupled map lattices display spatio-temporal chaos on the horseshoes.

Chen, Yi-Chiuan, E-mail: YCChen@math.sinica.edu.tw [Institute of Mathematics, Academia Sinica, Taipei 10617, Taiwan (China)] [Institute of Mathematics, Academia Sinica, Taipei 10617, Taiwan (China); Chen, Shyan-Shiou, E-mail: sschen@ntnu.edu.tw [Department of Mathematics, National Taiwan Normal University, Taipei 11677, Taiwan (China)] [Department of Mathematics, National Taiwan Normal University, Taipei 11677, Taiwan (China); Yuan, Juan-Ming, E-mail: jmyuan@pu.edu.tw [Department of Financial and Computational Mathematics, Providence University, Shalu, Taichung 43301, Taiwan (China)] [Department of Financial and Computational Mathematics, Providence University, Shalu, Taichung 43301, Taiwan (China)

2014-04-15T23:59:59.000Z

10

A thermoacoustic traveling wave linear amplifier  

Science Journals Connector (OSTI)

This paper describes an experiment to show linear amplification of traveling sound waves in a duct using a thermoacoustic regenerator. As noted by Ceperley [J. Acoust. Soc. Am. 66 1508–1513 (1979)] a Stirling engine?type regenerator should act as an acoustic gain medium for traveling waves in a duct. This principle is used in thermoacoustic traveling wave engines to transfer power from heat reservoirs to acoustic energy. However it is difficult to produce finite gain for pure traveling wave impedance since viscous losses in the channels of the regenerator overcome the gain and previous workers have only been able to show reduced loss in such a system. Optimizing the regenerator design with numerical modeling and using a greater temperature difference suggest that a traveling wave thermal amplifier can produce 2 dB of real gain over two octaves for traveling waves in air. Such a device would amplify a broadband acoustic signal without electrical transducers. Design of the amplifier and experimental results will be shown.

Robert A. Hiller

2000-01-01T23:59:59.000Z

11

A Travelling-Wave Uni-Travelling Photodiode for Continuous Wave Terahertz Generation  

E-Print Network (OSTI)

A Travelling-Wave Uni-Travelling Photodiode for Continuous Wave Terahertz Generation E. Rouvalis1 the performance of photodiodes both in terms of responsivity and frequency response. Thus, the resulting ultra-fast photodiode integrated with an antenna can be used as the photomixing element in order to generate

Haddadi, Hamed

12

A traveling wave piezoelectric beam robot  

Science Journals Connector (OSTI)

In this paper, the operation principles of a traveling wave piezoelectric beam robot are presented. A prototype consisting of an aluminum beam structure, with two non-collocated piezoelectric patches bonded on its surface, was fabricated and tested to demonstrate the generation of a traveling wave on the beam based on the one mode excitation and the two mode excitation operation principles for propulsion. A numerical model was developed and used to study and optimize the generated motion of the piezoelectric beam robot. Experimental characterization of the robot for the two types of operation has been carried out, a comparison between them is made and results are given in this paper.

H Hariri; Y Bernard; A Razek

2014-01-01T23:59:59.000Z

13

Enabling time travel for the scholarly web  

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

Enabling time travel for the scholarly web Enabling time travel for the scholarly web An international team of information scientists has begun a study to investigate how web links...

14

Transmission line protection based on travelling waves  

Science Journals Connector (OSTI)

Major problem of tripping signal of a relay based on steady state component does not warranty faster tripping schemes for protection of extra high voltage transmission lines. Proposed work has made an attempt to find solution to the problem of fault ... Keywords: postfault voltage, relaying signals, surge impedence, transmission line protection, travelling waves

Anuradha S. Deshpande; Grishma S. Shah

2011-12-01T23:59:59.000Z

15

TRAVELLING WAVES FOR A NONLOCAL DOUBLEOBSTACLE PROBLEM  

E-Print Network (OSTI)

, University of Utah, Salt Lake City, Utah 84112, USA Abstract Existence, uniqueness, and regularity properties of a natural free energy functional [2, 8, 9]. The equation t u = tanh {J u - h} - u, (3) for a similar to shifts in the independent variable z) travelling wave solution of (2) satisfying (8). Regularity

Fife, Paul

16

Stable operating regime for traveling wave devices  

DOE Patents (OSTI)

Autophase stability is provided for a traveling wave device (TWD) electron beam for amplifying an RF electromagnetic wave in walls defining a waveguide for said electromagnetic wave. An off-axis electron beam is generated at a selected energy and has an energy noise inherently arising from electron gun. The off-axis electron beam is introduced into the waveguide. The off-axis electron beam is introduced into the waveguide at a second radius. The waveguide structure is designed to obtain a selected detuning of the electron beam. The off-axis electron beam has a velocity and the second radius to place the electron beam at a selected distance from the walls defining the waveguide, wherein changes in a density of the electron beam due to the RF electromagnetic wave are independent of the energy of the electron beam to provide a concomitant stable operating regime relative to the energy noise.

Carlsten, Bruce E. (Los Alamos, NM)

2000-01-01T23:59:59.000Z

17

Gain and efficiency of a short traveling wave heat engine  

Science Journals Connector (OSTI)

Gain and efficiency equations are derived and evaluated for a traveling wave heat engine having a regenerator of short length compared with an acoustic wavelength. A traveling wave heat engine is a modified Stirling engine in which acoustic waves replace the usual pistons and energy is transferred between thermal and acoustic forms depending on the wave direction [P. H. Ceperley J. Acoust. Soc. Am. 66 1508–1513 (1979)]. This paper is similar to another paper on gain and efficiency [P. H. Ceperley J. Acoust. Soc. Am. 72 1688–1694 (1982)] except that the present paper assumes that the wave impedance is not determined by the regenerator's properties but instead by the acoustic circuit exterior to the regenerator. For acoustic impedance of freely propagating traveling waves in air the efficiency is limited to 11% of Carnot efficiency due to visious heating in the regenerator. This can be greatly increased by going to higher impedances; e.g. 79% is possible at ten times greater impedance.

Peter H. Ceperley

1984-01-01T23:59:59.000Z

18

Superconducting travelling wave ring with high gradient accelerating section  

SciTech Connect

Use of a superconducting traveling wave accelerating (STWA) structure instead of a standing wave cavity has major advantages in increasing the accelerating gradient in the ILC. In contrast with standing wave cavity STWA requires feedback loop, which sends wave from the structure output to input, making a superconducting traveling wave ring (STWR). One or few input couplers need to excite STWR and compensate power dissipations due to beam loading. To control traveling wave regime in the structure two independent knobs can be used for tuning both resonant ring frequency and backward wave. We discuss two variants of the STWR with one and two feed couplers.

Avrakhov, P.; Solyak, N.; /Fermilab

2007-06-01T23:59:59.000Z

19

Travelling waves and spatial hierarchies in measles epidemics  

E-Print Network (OSTI)

Travelling waves and spatial hierarchies in measles epidemics B. T. Grenfell*, O. N. Bjùrnstad ............................................................................................................................................................................................................................................................................ Spatio-temporal travelling waves are striking manifestations of predator±prey and host±parasite dynamics. However, few systems are well enough documented both to detect repeated waves and to explain

20

Effective traveling-wave excitation below the speed of light  

Science Journals Connector (OSTI)

We demonstrate that effective traveling-wave excitation of high-gain amplifiers requires velocities that are remarkably slower than the velocity of light. Experiments with a...

Tommasini, Riccardo; Fill, Ernst E

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

SOLITARY-WAVE AND MULTI-PULSED TRAVELING-WAVE SOLUTIONS OF BOUSSINESQ SYSTEMS  

E-Print Network (OSTI)

SOLITARY-WAVE AND MULTI-PULSED TRAVELING-WAVE SOLUTIONS OF BOUSSINESQ SYSTEMS MIN CHEN Department words: water wave, Boussinesq system, traveling wave, homoclinic orbit, multi-pulsed solution 1. Introduction This paper studies solitary-wave and multi-pulsed solutions of the Boussinesq systems t + ux + (u

Chen, Min

22

Enabling time travel for the scholarly web  

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

Enabling time travel for the scholarly web Enabling time travel for the scholarly web Enabling time travel for the scholarly web An international team of information scientists has begun a study to investigate how web links in scientific and other academic articles fail to lead to the resources being referenced. July 16, 2013 Herbert Van de Sompel, a Los Alamos National Laboratory information scientist, describes the information pathway involved in preventing "reference rot" in scientific material linked to the web. Herbert Van de Sompel, a Los Alamos National Laboratory information scientist, describes the information pathway involved in preventing "reference rot" in scientific material linked to the web. Contact Nancy Ambrosiano Communications Office (505) 667-0471 Email "Increasingly, scientific papers contain links to web pages containing,

23

Traveling wave device for combining or splitting symmetric and asymmetric waves  

DOE Patents (OSTI)

A traveling wave device for the combining or splitting of symmetric and asymmetric traveling wave energy includes a feed waveguide for traveling wave energy, the feed waveguide having an input port and a launching port, a reflector for coupling wave energy between the feed waveguide and a final waveguide for the collection and transport of wave energy to or from the reflector. The power combiner has a launching port for symmetrical waves which includes a cylindrical section coaxial to the feed waveguide, and a launching port for asymmetric waves which includes a sawtooth rotated about a central axis.

Möbius, Arnold (Eggenstein, DE); Ives, Robert Lawrence (Saratoga, CA)

2005-07-19T23:59:59.000Z

24

Travel Time Forecasting Lyngby 2007  

E-Print Network (OSTI)

part of a new real-time traffic reporting system. This system is in the pipeline in the framework steps . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7.4 Data cleaning, repair and aggregation

25

Neutron damage reduction in a traveling wave reactor  

SciTech Connect

Traveling wave reactors are envisioned to run on depleted or natural uranium with no need for enrichment or reprocessing, and in a manner which requires little to no operator intervention. If feasible, this type of reactor has significant advantages over conventional nuclear power systems. However, a practical implementation of this concept is challenging as neutron irradiation levels many times greater than those in conventional reactors appear to be required for a fission wave to propagate. Radiation damage to the fuel and cladding materials presents a significant obstacle to a practical design. One possibility for reducing damage is to soften the neutron energy spectrum. Here we show that using a uranium oxide fuel form will allow a shift in the neutron spectrum that can result in at least a three fold decrease in dpa levels for fuel cladding and structural steels within the reactor compared with the dpa levels expected when using a uranium metal fuel. (authors)

Osborne, A. G.; Deinert, M. R. [Dept. of Mechanical Engineering, Univ. of Texas at Austin, Austin, TX (United States)

2012-07-01T23:59:59.000Z

26

QCD traveling waves at non-asymptotic energies  

E-Print Network (OSTI)

Using consistent truncations of the BFKL kernel, we derive analytical traveling-wave solutions of the Balitsky-Kovchegov saturation equation for both fixed and running coupling. A universal parametrization of the ``interior'' of the wave front is obtained and compares well with numerical simulations of the original Balitsky-Kovchegov equation, even at non-asymptotic energies. Using this universal parametrization, we find evidence for a traveling-wave pattern of the dipole amplitude determined from the gluon distribution extracted from deep inelastic scattering data.

C. Marquet; R. Peschanski; G. Soyez

2005-10-03T23:59:59.000Z

27

Ozone heating and the destabilization of traveling waves during summer  

SciTech Connect

The effects of ozone heating on the linear stability of lower stratospheric traveling waves of the summertime, extratropical circulation are examined. Based on coupled equations for the quasigeostrophic potential vorticity and ozone volume mixing ratio, it is shown that the diabatic heating arising from ozone advection can offset the damping due to Newtonian cooling, leading to wave amplification and significant changes in the structure and zonally rectified fluxes of the wave fields in both the lower stratosphere and troposphere. The vertical profile of the zonal mean wind plays a crucial role in determining whether the ozone heating destabilizes eastward and/or westward traveling disturbances.

Nathan, T.R.; Cordero, E.C.; Li, L. [Univ. of California, Davis, CA (United States)] [Univ. of California, Davis, CA (United States)

1994-07-01T23:59:59.000Z

28

Quantum mechanics and the time travel paradox  

E-Print Network (OSTI)

The closed causal chains arising from backward time travel do not lead to paradoxes if they are self consistent. This raises the question as to how physics ensures that only self-consistent loops are possible. We show that, for one particular case at least, the condition of self consistency is ensured by the interference of quantum mechanical amplitudes associated with the loop. If this can be applied to all loops then we have a mechanism by which inconsistent loops eliminate themselves.

David T. Pegg

2005-06-17T23:59:59.000Z

29

Simulation and Analysis of Superconducting Traveling-Wave Parametric Amplifiers  

E-Print Network (OSTI)

Superconducting parametric amplifiers have great promise for quantum-limited readout of superconducting qubits and detectors. Until recently, most superconducting parametric amplifiers had been based on resonant structures, limiting their bandwidth and dynamic range. Broadband traveling-wave parametric amplifiers based both on the nonlinear kinetic inductance of superconducting thin films and on Josephson junctions are in development. By modifying the dispersion property of the amplifier circuit, referred to as dispersion engineering, the gain can be greatly enhanced and the size can be reduced. We present two theoretical frameworks for analyzing and understanding such parametric amplifiers: (1) generalized coupled-mode equations and (2) a finite difference time domain (FDTD) model combined with a small signal analysis. We show how these analytical and numerical tools may be used to understand device performance.

Saptarshi Chaudhuri; Jiansong Gao; Kent Irwin

2015-01-11T23:59:59.000Z

30

Gain and efficiency of a short traveling wave heat engine  

Science Journals Connector (OSTI)

Gain and efficiency equations are derived for a traveling wave heat engine which has a regenerator that is SHORT compared to an acoustic wavelength. A traveling wave heat engine is a modified Stirling engine in which acoustical waves replace the usual pistons and energy is transformed from thermal to acoustical forms and vice?versa depending on the wave direction. A previous paper examined the energy transformation process for isothermal wave propagation in an infinite regenerator having a temperature gradient [P. H. Ceperley J. Acoust. Soc. Am. 7 2 1688–1694 (1982)]. Similar to that paper the present paper assumes: small amplitude waves nonturbulent flow a constant heat exchange coefficient and no regenerator end effects. In contrast the present paper assumes that the wave impedance is NOT determined by the regenerators’s properties but is instead set by the acoustical circuit exterior to the regenerator. In this paper the normalized power gain and efficiency are calculated and graphed as functions of dimensionless variables. For acoustical impedances of freely propagating waves and a Prandtl number of 0.7 the efficiency is limited to 10% of Carnot efficiency due to viscous losses in the regenerator. Higher efficiencies are possible with higher impedances e.g. if the impedance is multiplied by 10 79% of Carnot efficiencies are possible. Methods of achieving such impedances are discussed. Traveling waveheat pumps are similarly modeled and have comparable potential efficiencies.

Peter H. Ceperley

1985-01-01T23:59:59.000Z

31

Supplemental Guidance Regarding Compensatory Time Off for Travel |  

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

Supplemental Guidance Regarding Compensatory Time Off for Travel Supplemental Guidance Regarding Compensatory Time Off for Travel Supplemental Guidance Regarding Compensatory Time Off for Travel Questions and answers on issues that supplement the final regulations on compensatory time for travel issued by the Office of Personnel Management. In addition, a sample worksheet is attached to assist travelers in determining and documenting their travel time that may be credited for compensatory time for travel. This information will be incorporated in Appendix D of the DOE Handbook on Overtime when the handbook is updated. Supplemental Guidance Regarding Compensatory Time Off for Travel Responsible Contacts Bruce Murray HR Policy Advisor E-mail bruce.murray@hq.doe.gov Phone 202-586-3372 More Documents & Publications DOE Handbook on Overtime

32

Transformation of spatial and perturbation derivatives of travel time  

E-Print Network (OSTI)

Transformation of spatial and perturbation derivatives of travel time at a general interface and perturbation parameters. We derive the explicit equations for transforming these travel­time derivatives Hamiltonian function and are applicable to the transformation of travel­time derivatives in both isotropic

Cerveny, Vlastislav

33

Selectively-undercut traveling-wave electroabsorption modulators  

E-Print Network (OSTI)

. Piprek, and J. Bowers, "Selective undercut etching of InGaAs and InGaAsP quantum wells for improved-wet-etching-active-region traveling-wave electro- absorption modulator," in in Proceedings IEEE LEOS 18, 2005, pp. 426­427. 6. Y- absorption modulators based on undercut-etching the active-region," IEEE Photon. Technol. Lett. 17, 2065

Coldren, Larry A.

34

Apparatus and method for measuring and imaging traveling waves  

DOE Patents (OSTI)

An apparatus is provided for imaging traveling waves in a medium. The apparatus includes a vibration excitation source configured to impart traveling waves within a medium. An emitter is configured to produce two or more wavefronts, at least one wavefront modulated by a vibrating medium. A modulator is configured to modulate another wavefront in synchronization with the vibrating medium. A sensing media is configured to receive in combination the modulated one wavefront and the another wavefront and having a detection resolution within a limited bandwidth. The another wavefront is modulated at a frequency such that a difference frequency between the one wavefront and the another wavefront is within a response range of the sensing media. Such modulation produces an image of the vibrating medium having an output intensity that is substantially linear with small physical variations within the vibrating medium for all vibration frequencies above the sensing media's response bandwidth. A detector is configured to detect an image of traveling waves in the vibrating medium resulting from interference between the modulated one wavefront and the another wavefront when combined in association with the sensing media. The traveling wave can be used to characterize certain material properties of the medium. Furthermore, a method is provided for imaging and characterizing material properties according to the apparatus.

Telschow, Kenneth L. (Idaho Falls, ID); Deason, Vance A. (Idaho Falls, ID)

2001-01-01T23:59:59.000Z

35

Math. Nachr. 232 (2001), 39 93 On the Structure of Spectra of Modulated Travelling Waves  

E-Print Network (OSTI)

Math. Nachr. 232 (2001), 39 ­ 93 On the Structure of Spectra of Modulated Travelling Waves By Bj; accepted June 29, 2000) Abstract. Modulated travelling waves are solutions to reaction­diffusion equations, the point spectrum, and the essential spectrum of the linearization about a modulated travelling wave

Gallay, Thierry

36

Shielded serpentine traveling wave tube deflection structure  

DOE Patents (OSTI)

A shielded serpentine slow wave deflection structure (10) having a serpene signal conductor (12) within a channel groove (46). The channel groove (46) is formed by a serpentine channel (20) in a trough plate (18) and a ground plane (14). The serpentine signal conductor (12) is supported at its ends by coaxial feed through connectors 28. A beam interaction trough (22) intersects the channel groove (46) to form a plurality of beam interaction regions (56) wherein an electron beam (54) may be deflected relative to the serpentine signal conductor (12).

Hudson, Charles L. (Santa Barbara, CA); Spector, Jerome (Berkeley, CA)

1994-01-01T23:59:59.000Z

37

Method for migrating seismic data by using ray tracing in determining two way travel times  

SciTech Connect

A method is described for depth migrating ray traces before stacking comprising the steps of: receiving raw seismic data signals representing acoustic waves generated by a plurality of sources and detected by a plurality of receivers, each of said sources and said receivers having a surface position; generating a set of one way travel times for each surface position to all image points; storing said one way travel times; identifying a set of one way travel times from one source surface position to each of said image points; identifying a second set of one way travel times from one receiver surface position to each of said image points; calculating a two way travel time set to said image points by summing said set of one way travel times for said one source surface position and said second set of one way travel times for said one receiver surface position to each of said image points; mapping a seismic trace associated with a source and receiver combination represented by said two way travel time set; and displaying said map of said seismic trace associated with said source and receiver combination.

Wang, Sheinshion; Sinton, J.B.; Hanson, D.W.

1993-07-20T23:59:59.000Z

38

Spent fuel utilization in a compact traveling wave reactor  

SciTech Connect

In recent years, several innovative designs of nuclear reactors are proposed. One of them is Traveling Wave Reactor (TWR). The unique characteristic of a TWR is the capability of breeding its own fuel in the reactor. The reactor is fueled by mostly depleted, natural uranium or spent nuclear fuel and a small amount of enriched uranium to initiate the fission process. Later on in the core, the reactor gradually converts the non-fissile material into the fissile in a process like a traveling wave. In this work, a TWR with spent nuclear fuel blanket was studied. Several parameters such as reactivity coefficients, delayed neutron fraction, prompt neutron generation lifetime, and fission power, were analyzed. The discharge burnup composition was also analyzed. The calculation is performed by a continuous energy Monte Carlo code McCARD.

Hartanto, Donny; Kim, Yonghee [Korea Advanced Institute of Science and Technology 373-1 Kusong-dong, Yuseong-gu, Daejeon, 305-701 (Korea, Republic of)

2012-06-06T23:59:59.000Z

39

Three-cell traveling wave superconducting test structure  

E-Print Network (OSTI)

Use of a superconducting traveling wave accelerating (STWA) structure with a small phase advance per cell rather than a standing wave structure may provide a significant increase of the accelerating gradient in the ILC linac. For the same surface electric and magnetic fields the STWA achieves an accelerating gradient 1.2 larger than TESLA-like standing wave cavities. The STWA allows also longer acceleration cavities, reducing the number of gaps between them. However, the STWA structure requires a SC feedback waveguide to return the few hundreds of MW of circulating RF power from the structure output to the structure input. A test single-cell cavity with feedback was designed, manufactured and successfully tested demonstrating the possibility of a proper processing to achieve a high accelerating gradient. These results open way to take the next step of the TW SC cavity development: to build and test a traveling-wave three-cell cavity with a feedback waveguide. The latest results of the single-cell cavity tests...

Avrakhov, Pavel; Kazakov, Sergey; Solyak, Nikolay; Wu, Genfa; Yakovlev, Vyacheslav P

2011-01-01T23:59:59.000Z

40

Supplemental Guidance Regarding Compensatory Time Off for Travel  

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

SUPPLEMENTAL GUIDANCE SUPPLEMENTAL GUIDANCE REGARDING COMPENSATORY TIME OFF FOR TRAVEL (Revised October 27, 2008) Following are questions and answers on issues that supplement the final regulations effective this date on compensatory time for travel issued by the Office of Personnel Management on April 17, 2007. In addition, a sample worksheet is attached to assist travelers in determining and documenting their travel time that may be credited for compensatory time for travel. This information will be incorporated in Appendix D of the DOE Handbook on Overtime when the handbook is updated. Q1. Who is eligible for this benefit? A1. All employees are eligible except the following: the Secretary, SESs, employees covered by other forms of overtime compensation, including law enforcement

Note: This page contains sample records for the topic "wave travel time" 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

Resonantly phase-matched Josephson junction traveling wave parametric amplifier  

E-Print Network (OSTI)

We develop a technique to overcome phase-mismatch in Josephson-junction traveling wave parametric amplifiers in order to achieve high gain over a broad bandwidth. Using "resonant phase matching," we design a compact superconducting device consisting of a transmission line with subwavelength resonant inclusions that simultaneously achieves a gain of 20 dB, an instantaneous bandwidth of 3 GHz, and a saturation power of -98 dBm. Such an amplifier is well-suited to cryogenic broadband microwave measurements such as the multiplexed readout of quantum coherent circuits based on superconducting, semiconducting, or nano-mechanical elements as well as traditional astronomical detectors.

Kevin O'Brien; Chris Macklin; Irfan Siddiqi; Xiang Zhang

2014-06-09T23:59:59.000Z

42

Considering Risk-Taking Behavior in Travel Time Reliability  

E-Print Network (OSTI)

wide distribution of preferences for speed and reliability.Distribution of Motorists’ Preference for Travel Time and Reliability:time, reliability and cost have normal distributions, i.e. ,

2005-01-01T23:59:59.000Z

43

Physica D 156 (2001) 1938 Destabilization and localization of traveling waves  

E-Print Network (OSTI)

Physica D 156 (2001) 19­38 Destabilization and localization of traveling waves by an advected field amplitude traveling waves arising in a supercritical Hopf bifurcation, that are coupled to a slowly varying, real field. The field is advected by the waves and, in turn, affects their stability via a coupling

Roxin, Alex

44

Traveling waves in yeast extract and in cultures of Dictyostelium discoideum  

E-Print Network (OSTI)

Traveling waves in yeast extract and in cultures of Dictyostelium discoideum Stefan C. Mu traveling reaction-diffusion waves occur in response to oscillatory reactions. Glycolytic degradation of sugar in a yeast extract leads to the spontaneous formation of NADH and proton waves. Manipula- tion

Steinbock, Oliver

45

Faster than light motion does not imply time travel  

E-Print Network (OSTI)

Seeing the many examples in the literature of causality violations based on faster-than- light (FTL) signals one naturally thinks that FTL motion leads inevitably to the possibility of time travel. We show that this logical inference is invalid by demonstrating a model, based on (3+1)-dimensional Minkowski spacetime, in which FTL motion is permitted (in every direction without any limitation on speed) yet which does not admit time travel. Moreover, the Principle of Relativity is true in this model in the sense that all observers are equivalent. In short, FTL motion does not imply time travel after all.

H. Andréka; J. X. Madarász; I. Németi; M. Stannett; G. Székely

2014-07-09T23:59:59.000Z

46

Faster than light motion does not imply time travel  

E-Print Network (OSTI)

Seeing the many examples in the literature of causality violations based on faster-than- light (FTL) signals one naturally thinks that FTL motion leads inevitably to the possibility of time travel. We show that this logical inference is invalid by demonstrating a model, based on (3+1)-dimensional Minkowski spacetime, in which FTL motion is permitted (in every direction without any limitation on speed) yet which does not admit time travel. Moreover, the Principle of Relativity is true in this model in the sense that all observers are equivalent. In short, FTL motion does not imply time travel after all.

Andréka, H; Németi, I; Stannett, M; Székely, G

2014-01-01T23:59:59.000Z

47

DEVELOPING CORRIDOR-LEVEL TRUCK TRAVEL TIME ESTIMATES AND OTHER  

E-Print Network (OSTI)

by comparing estimated travel times during a winter weather-induced delay. The analysis showed that corridor given on increased sensor spacing and filter improvement. Finally, potential performance metrics

Bertini, Robert L.

48

Statistical sampling plans for travel time measurement in urban areas  

E-Print Network (OSTI)

, Hallenbeck, and Schroeder conducted a study to compare statistically the travel time data collected with the two different techniques. The study was conducted on three arterial streets in Bellevue, a suburb of Seattle, Washington, and the evaluation..., Hallenbeck, and Schroeder conducted a study to compare statistically the travel time data collected with the two different techniques. The study was conducted on three arterial streets in Bellevue, a suburb of Seattle, Washington, and the evaluation...

Turner, Shawn

2012-06-07T23:59:59.000Z

49

Three-cell traveling wave superconducting test structure  

SciTech Connect

Use of a superconducting traveling wave accelerating (STWA) structure with a small phase advance per cell rather than a standing wave structure may provide a significant increase of the accelerating gradient in the ILC linac. For the same surface electric and magnetic fields the STWA achieves an accelerating gradient 1.2 larger than TESLA-like standing wave cavities. The STWA allows also longer acceleration cavities, reducing the number of gaps between them. However, the STWA structure requires a SC feedback waveguide to return the few hundreds of MW of circulating RF power from the structure output to the structure input. A test single-cell cavity with feedback was designed, manufactured and successfully tested demonstrating the possibility of a proper processing to achieve a high accelerating gradient. These results open way to take the next step of the TW SC cavity development: to build and test a travelingwave three-cell cavity with a feedback waveguide. The latest results of the single-cell cavity tests are discussed as well as the design of the test 3-cell TW cavity.

Avrakhov, Pavel; Kanareykin, Alexei; /Euclid Techlabs, Solon; Kazakov, Sergey; Solyak, Nikolay; Wu, Genfa; Yakovlev, Vyacheslav P.; /Fermilab

2011-03-01T23:59:59.000Z

50

Supercritical Hadley circulation within a layer of fluid saturated porous medium: Bifurcation to traveling wave  

SciTech Connect

Hadley circulation induced by horizontal and vertical temperature gradients imposed on a fluid saturated porous medium layer is simulated numerically. The flow is assumed to be longitudinal, that is the secondary flow is composed of cells with axes transverse to the direction of the Hadley circulation. Critical (bifurcation) states predicted theoretically via linear stability analysis are verified by the numerical results giving confidence on the accuracy of the method. Several values of horizontal Rayleigh number, Ra{sub h}, and vertical Rayleigh number, Ra{sub v}, are studied. Results indicate that beyond a threshold horizontal Rayleigh number value the flow and temperature fields evolve from subcritical Hadley circulation to a supercritical time periodic flow. The secondary flow emerges in the form of a traveling wave aligned with the main (Hadley) flow direction. This traveling wave is characterized, at supercritical low vertical Rayleigh numbers, by the continuous drifting of two horizontal layers of flow cells that move in opposite directions. As the vertical Rayleigh number increases, the traveling wave becomes characterized by a unique layer of cells drifting in the direction opposite to the applied horizontal temperature gradient. Numerical animation unravels the main features of the transport process. This simplified model is of fundamental and practical importance, for instance, to the study of geothermal activities, underground transport of pollutants, paper processing, crystal growth, building insulation, and gas reservoirs.

Manole, D.M. [MCD Inc., Anniston, AL (United States); Lage, J.L.; Antohe, B.V. [Southern Methodist Univ., Dallas, TX (United States)

1995-12-31T23:59:59.000Z

51

Wave-particle interaction and Hamiltonian dynamics investigated in a traveling wave tube  

SciTech Connect

For wave-particle interaction studies, the one-dimensional (1-D) beam-plasma system can be advantageously replaced by a Traveling Wave Tube (TWT). This led us to a detailed experimental analysis of the self-consistent interaction between unstable waves and a small either cold or warm beam. More recently, a test electron beam has been used to observe its non-self-consistent interaction with externally excited wave(s). The velocity distribution function of the electron beam is investigated with a trochoidal energy analyzer that records the beam energy distribution at the output of the TWT. An arbitrary waveform generator is used to launch a prescribed spectrum of waves along the slow wave structure (a 4 m long helix) of the TWT. The nonlinear synchronization of particles by a single wave responsible for Landau damping is observed. The resonant velocity domain associated to a single wave is also observed, as well as the transition to large-scale chaos when the resonant domains of two waves and their secondary resonances overlap leading to a typical 'devil's staircase' behavior. A new strategy for the control of chaos is tested.

Doveil, Fabrice; Macor, Alessandro [Physique des Interactions Ioniques et Moleculaires, Unite 6633 CNRS-Universite de Provence, Equipe Turbulence Plasma, Case 321, Centre de Saint-Jerome, F-13397 Marseille cedex 20 (France)

2006-05-15T23:59:59.000Z

52

Self-similar nested sequences on a chaotic attractor for traveling-wave electrophoresis  

Science Journals Connector (OSTI)

Oscillating electric potentials are applied to interdigitated arrays of cylindrical electrodes above and below a stationary conducting viscous fluid. The phases of these potentials are chosen to produce a longitudinal traveling wave that traps high-mobility ions and partially traps intermediate-mobility ions in periodic and narrowband chaotic attractors with average velocities that are commensurate with the wave speed. Stable periodic attractors have periods up to 101 times the wave period. Incommensurate broadband chaotic attractors are described by one-dimensional iterated contact-angle return maps, which feature self-similar nested sequences that converge geometrically at unstable trapped orbits. Sequences of singular angles and sequences of step transitions are characterized by distinct convergence factors. A criterion for allowed interelectrode orbits is developed. Experiments are suggested to evaluate the applicability of the theory to microfluidic separations.

Boyd F. Edwards

2009-09-16T23:59:59.000Z

53

Rank Synopses for Efficient Time Travel on the Web Graph  

E-Print Network (OSTI)

Rank Synopses for Efficient Time Travel on the Web Graph Klaus Berberich, Srikanta Bedathur}@mpi-inf.mpg.de ProblemProblem SolutionSolution ExperimentsExperiments Step 1: PageRank Normalization We normalize PageRank scores computed on Gt ( Vt, Et ) (i.e., the graph at time t ) dividing by the lower bound PageRank score

54

Traveling Waves from the Arclength Parameterization: Vortex Sheets with Surface Tension  

E-Print Network (OSTI)

Traveling Waves from the Arclength Parameterization: Vortex Sheets with Surface Tension Benjamin for the vortex sheet with surface tension. We use the angle- arclength description of the interface rather than prove that there exist traveling vortex sheets with surface tension bifurcating from equilibrium. We

Wright, J. Douglas

55

Flow calculations for Yucca Mountain groundwater travel time (GWTT-95)  

SciTech Connect

In 1983, high-level radioactive waste repository performance requirements related to groundwater travel time were defined by NRC subsystem regulation 10 CFR 60.113. Although DOE is not presently attempting to demonstrate compliance with that regulation, understanding of the prevalence of fast paths in the groundwater flow system remains a critical element of any safety analyses for a potential repository system at Yucca Mountain, Nevada. Therefore, this analysis was performed to allow comparison of fast-path flow against the criteria set forth in the regulation. Models developed to describe the conditions for initiation, propagation, and sustainability of rapid groundwater movement in both the unsaturated and saturated zones will form part of the technical basis for total- system analyses to assess site viability and site licensability. One of the most significant findings is that the fastest travel times in both unsaturated and saturated zones are in the southern portion of the potential repository, so it is recommended that site characterization studies concentrate on this area. Results support the assumptions regarding the importance of an appropriate conceptual model of groundwater flow and the incorporation of heterogeneous material properties into the analyses. Groundwater travel times are sensitive to variation/uncertainty in hydrologic parameters and in infiltration flux at upper boundary of the problem domain. Simulated travel times are also sensitive to poorly constrained parameters of the interaction between flow in fractures and in the matrix.

Altman, S.J.; Arnold, B.W.; Barnard, R.W.; Barr, G.E.; Ho, C.K.; McKenna, S.A.; Eaton, R.R.

1996-09-01T23:59:59.000Z

56

Wunderlich, Kaufman, and Smith LINK TRAVEL TIME PREDICTION FOR  

E-Print Network (OSTI)

Wunderlich, Kaufman, and Smith 1 LINK TRAVEL TIME PREDICTION FOR DECENTRALIZED ROUTE GUIDANCE@att.com Robert L. Smith University of Michigan Department of Industrial and Operations Engineering Ann Arbor, MI-dating process is utilized to insure the discovery of a stable #12;Wunderlich, Kaufman, and Smith 2 routing after

Smith, Robert L.

57

A General Mapping Approach and New Travelling Wave Solutions to (2+1)-Dimensional Boussinesq Equation  

Science Journals Connector (OSTI)

A general mapping deformation method is presented and applied to a (2+1)-dimensional Boussinesq system. Many new types of explicit and exact travelling wave solutions, which contain solitary wave solutions, periodic wave solutions, Jacobian and Weierstrass doubly periodic wave solutions, and other exact excitations like polynomial solutions, exponential solutions, and rational solutions, etc., are obtained by a simple algebraic transformation relation between the (2+1)-dimensional Boussinesq equation and a generalized cubic nonlinear Klein–Gordon equation.

Zheng Chun-Long; Chen Li-Qun

2004-01-01T23:59:59.000Z

58

LINEAR STABILITY ANALYSIS FOR PERIODIC TRAVELING WAVES OF THE BOUSSINESQ EQUATION AND THE KGZ SYSTEM  

E-Print Network (OSTI)

LINEAR STABILITY ANALYSIS FOR PERIODIC TRAVELING WAVES OF THE BOUSSINESQ EQUATION AND THE KGZ stability of spatially periodic waves for the Boussinesq equa- tion (the cases p = 2, 3) and the Klein interest will be mainly in two PDE - the Boussinesq equation and the Klein-Gordon-Zakharov system, although

Stanislavova, Milena

59

LINEAR STABILITY ANALYSIS FOR PERIODIC TRAVELING WAVES OF THE BOUSSINESQ EQUATION AND THE KGZ SYSTEM  

E-Print Network (OSTI)

LINEAR STABILITY ANALYSIS FOR PERIODIC TRAVELING WAVES OF THE BOUSSINESQ EQUATION AND THE KGZ stability of spatially periodic waves for the Boussinesq equa- tion (the cases p = 2, 3) and the Klein in two PDEs - the Boussinesq equation and the Klein-Gordon-Zakharov system, although the methods that we

Stanislavova, Milena

60

ON A FREE BOUNDARY PROBLEM ARISING IN DETONATION THEORY: CONVERGENCE TO TRAVELLING WAVES  

E-Print Network (OSTI)

1 ON A FREE BOUNDARY PROBLEM ARISING IN DETONATION THEORY: CONVERGENCE TO TRAVELLING WAVES by M] and by Ludford and Oyediran in [10]. It is a simple model of detonation waves where the reaction is supposed to occur at the detonation front x = i(t), and where q is the ignition temperature. We consider three

Hulshof, Joost

Note: This page contains sample records for the topic "wave travel time" 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

Pitchfork bifurcation and all-optical flip-flop operation with a coupled traveling-wave amplifier system  

Science Journals Connector (OSTI)

Mirrorless optical bistability arising through pitchfork bifurcation is predicted in a coupled anisotropic traveling-wave laser amplifier system. It is shown theoretically that an...

Otsuka, Kenju; Chern, Jyh-Long; McIver, John K

1991-01-01T23:59:59.000Z

62

Applying petrophysical models to radar travel time and electrical resistivity tomograms: Resolution-dependent limitations  

E-Print Network (OSTI)

Applying petrophysical models to radar travel time and electrical resistivity tomograms: Resolution the utility of radar travel time tomography (RTT) and electrical-resistivity tomography (ERT) for estimating to radar travel time and electrical resistivity tomograms: Resolution-dependent limitations, J. Geophys

Singha, Kamini

63

Euro Working Group on Transportation 2014 Estimating Travel Time Distribution under different Traffic  

E-Print Network (OSTI)

Euro Working Group on Transportation 2014 Estimating Travel Time Distribution under different result in an increase in travel time variability and in a decrease in reliability. Reliability becomes of the distribution of travel time is needed to properly estimate these values. Congestion distorts the distribution

Boyer, Edmond

64

A ROUTE IMPROVEMENT ALGORITHM FOR THE VEHICLE ROUTING PROBLEM WITH TIME DEPENDENT TRAVEL TIMES  

E-Print Network (OSTI)

) formulate a time dependent vehicle routing problem with a general cost function and time window constraintsA ROUTE IMPROVEMENT ALGORITHM FOR THE VEHICLE ROUTING PROBLEM WITH TIME DEPENDENT TRAVEL TIMES MIGUEL A. FIGLIOZZI Civil & Environmental Engineering Department Portland State University P.O. Box 751

Bertini, Robert L.

65

Study of a high-order-mode gyrotron traveling-wave amplifier  

SciTech Connect

Physics and performance issues of a TE{sub 01}-mode gyrotron traveling-wave amplifier are studied in theory. For a high order mode, absolute instabilities on neighboring modes at the fundamental and higher cyclotron harmonic frequencies impose severe constraints to the device capability. Methods for their stabilization are outlined, on the basis of which the performance characteristics are examined in a multidimensional parameter space under the marginal stability criterion. The results demonstrate the viability of a high-order-mode traveling-wave amplifier and provide a roadmap for design tradeoffs among power, bandwidth, and efficiency. General trends are observed and illustrated with specific examples.

Chiu, C. C.; Tsai, C. Y.; Kao, S. H. [Department of Physics, National Tsing Hua University, Hsinchu 30043, Taiwan (China); Chu, K. R. [Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China); Barnett, L. R.; Luhmann, N. C. Jr. [Department of Applied Science, University of California, Davis, California 95616 (United States)

2010-11-15T23:59:59.000Z

66

Variable neighborhood search algorithm for heterogeneous traveling repairmen problem with time windows  

Science Journals Connector (OSTI)

The focus of this paper is generalized traveling repairman problem (TRP), a special case of the well known and well studied traveling salesman problem (TSP). Because of its specific objective function, that minimizes the sum of overall time all clients ... Keywords: Heterogeneous traveling repairmen problem with time windows, Operations planning, Variable neighborhood search

Nenad Bjeli?; Milorad Vidovi?; Draen Popovi?

2013-11-01T23:59:59.000Z

67

A pistonless Stirling engine—The traveling wave heat engine  

Science Journals Connector (OSTI)

The propagation of acoustical waves through a differentially heated regenerator results in gas in the regenerator undergoing a Stirling thermodynamic cycle. One direction of wave propagation results in amplification of the waves and conversion of thermal energy into acoustical energy. The opposite direction results in acoustical energy being used to pump heat. The ideal gain and maximum energy conversion rates are derived in this paper. Low power gain measurements were made which verify the derived gain equation. Practical engines and heat pumps using this principle are discussed.

Peter H. Ceperley

1979-01-01T23:59:59.000Z

68

On traveling wave solutions of a set of coupled Boussinesq-like equations  

SciTech Connect

A set of coupled partial differential equations of Boussinesq type are derived in the continuum limit from the equations of motion of Toda lattice with a transversal degree of freedom. Here the numerical stability of a hybrid traveling wave solution of such system (with longitudinal and transversal components) is investigated.

Muto, V.; Lomdahl, P.S. (Los Alamos National Lab., NM (USA)); Christiansen, P.L. (Technical Univ. of Denmark, Lyngby (Denmark). Lab. of Applied Mathematical Physics)

1990-06-01T23:59:59.000Z

69

TRAVELING WAVES IN 2D REACTIVE BOUSSINESQ SYSTEMS WITH NO-SLIP BOUNDARY CONDITIONS  

E-Print Network (OSTI)

TRAVELING WAVES IN 2D REACTIVE BOUSSINESQ SYSTEMS WITH NO-SLIP BOUNDARY systems of reactive Boussinesq equations in two di* *men- sional strips that are not aligned Boussinesq systems with no-slip boundary conditions (the fluid flow vanishes at* * the boundary). Much

Constantin, Peter

70

Equatorial Solitary Waves. Part 3: Westward-Traveling Modons  

Science Journals Connector (OSTI)

Boyd's previous work on equatorial Rossby solitary waves which derived the Korteweg-deVries equation using the method of multiple scales is here extended in several ways. First, the perturbation theory is carried, to the next highest order to (i) ...

John P. Boyd

1985-01-01T23:59:59.000Z

71

Analysis of influence of fuel price on individual activity-travel time expenditure  

Science Journals Connector (OSTI)

Abstract Fluctuation in fuel prices may lead to adaptations in people?s activity-travel behavior. Compared to other triggers of behavioral change, the impact of fuel prices has received only scant attention in the literature, especially with respect to short-run change in activity-travel behavior. To gain insight into this issue, travel diaries of a representative sample of individuals in the Netherlands who use the car for daily travel were analyzed. Seemingly unrelated regression analysis was used to examine the effects of fuel price on people?s travel time expenditures for different kinds of activities, differentiating between weekdays and weekends. The results indicate that fuel price is negatively correlated with travel time expenditures by car, and that this relationship differs between weekdays and weekends. When faced with increasing fuel prices, people seem to prefer reducing travel time expenditure by car for compulsory trips more than for leisure trips.

Dujuan Yang; Harry Timmermans

2013-01-01T23:59:59.000Z

72

Control of traveling-wave oscillations and bifurcation behavior in central pattern generators  

Science Journals Connector (OSTI)

Understanding synchronous and traveling-wave oscillations, particularly as they relate to transitions between different types of behavior, is a central problem in modeling biological systems. Here, we address this problem in the context of central pattern generators (CPGs). We use contraction theory to establish the global stability of a traveling-wave or synchronous oscillation, determined by the type of coupling. This opens the door to better design of coupling architectures to create the desired type of stable oscillations. We then use coupling that is both amplitude and phase dependent to create either globally stable synchronous or traveling-wave solutions. Using the CPG motor neuron network of a leech as an example, we show that while both traveling and synchronous oscillations can be achieved by several types of coupling, the transition between different types of behavior is dictated by a specific coupling architecture. In particular, it is only the “repulsive” but not the commonly used phase or rotational coupling that can explain the transition to high-frequency synchronous oscillations that have been observed in the heartbeat pattern generator of a leech. This shows that the overall dynamics of a CPG can be highly sensitive to the type of coupling used, even for coupling architectures that are widely believed to produce the same qualitative behavior.

Alexandra S. Landsman and Jean-Jacques Slotine

2012-10-23T23:59:59.000Z

73

Comparison of actinide production in traveling wave and pressurized water reactors  

SciTech Connect

The geopolitical problems associated with civilian nuclear energy production arise in part from the accumulation of transuranics in spent nuclear fuel. A traveling wave reactor is a type of breed-burn reactor that could, if feasible, reduce the overall production of transuranics. In one possible configuration, a cylinder of natural or depleted uranium would be subjected to a fast neutron flux at one end. The neutrons would transmute the uranium, producing plutonium and higher actinides. Under the right conditions, the reactor could become critical, at which point a self-stabilizing fission wave would form and propagate down the length of the reactor cylinder. The neutrons from the fission wave would burn the fissile nuclides and transmute uranium ahead of the wave to produce additional fuel. Fission waves in uranium are driven largely by the production and fission of {sup 239}Pu. Simulations have shown that the fuel burnup can reach values greater than 400 MWd/kgIHM, before fission products poison the reaction. In this work we compare the production of plutonium and minor actinides produced in a fission wave to that of a UOX fueled light water reactor, both on an energy normalized basis. The nuclide concentrations in the spent traveling wave reactor fuel are computed using a one-group diffusion model and are verified using Monte Carlo simulations. In the case of the pressurized water reactor, a multi-group collision probability model is used to generate the nuclide quantities. We find that the traveling wave reactor produces about 0.187 g/MWd/kgIHM of transuranics compared to 0.413 g/MWd/kgIHM for a pressurized water reactor running fuel enriched to 4.95 % and burned to 50 MWd/kgIHM. (authors)

Osborne, A.G.; Smith, T.A.; Deinert, M.R. [Department of Mechanical Engineering, University of Texas at Austin, Austin, TX (United States)

2013-07-01T23:59:59.000Z

74

Optimization Online - A Note on the Ichoua et al (2003) Travel Time ...  

E-Print Network (OSTI)

Feb 2, 2012 ... Abstract: In this paper we exploit some properties of the travel time model proposed by Ichoua et al (2003), on which most of the current ...

Guerriero Emanuela

2012-02-02T23:59:59.000Z

75

Conceptual design of an L-band recirculating superconducting traveling wave accelerating structure for ILC  

SciTech Connect

With this paper, we propose the conceptual design of a traveling wave accelerating structure for a superconducting accelerator. The overall goal is to study a traveling wave (TW) superconducting (SC) accelerating structure for ILC that allows an increased accelerating gradient and, therefore reduction of the length of the collider. The conceptual studies were performed in order to optimize the acceleration structure design by minimizing the surface fields inside the cavity of the structure, to make the design compatible with existing technology, and to determine the maximum achievable gain in the accelerating gradient. The proposed solution considers RF feedback system redirecting the accelerating wave that passed through the superconducting traveling wave acceleration (STWA) section back to the input of the accelerating structure. The STWA structure has more cells per unit length than a TESLA structure but provides an accelerating gradient higher than a TESLA structure, consequently reducing the cost. In this paper, the STWA cell shape optimization, coupler cell design and feedback waveguide solution are considered. We also discuss the field flatness in the superconducting TW structure, the HOM modes and multipactor performance have been studied as well. The proposed TW structure design gives an overall 46% gain over the SW ILC structure if the 10 m long TW structure is employed.

Avrakhov, P.; Kanareykin, A.; Liu, Z.; Kazakov, S.; /KEK, Tsukuba; Solyak, N.; /Fermilab; Yakovlev, V.; /Omega-P, New Haven /Yale U.; Gai, W.; /Argonne

2007-06-01T23:59:59.000Z

76

Real-time Water Waves with Wave Particles  

E-Print Network (OSTI)

This dissertation describes the wave particles technique for simulating water surface waves and two way fluid-object interactions for real-time applications, such as video games. Water exists in various different forms in our environment...

Yuksel, Cem

2010-10-12T23:59:59.000Z

77

Well-posedness and orbital stability of traveling waves for the Schrödinger-improved Boussinesq system  

Science Journals Connector (OSTI)

Abstract Considered here is the Schrödinger-improved Boussinesq system. First we prove local and global well-posedness in the energy space for the periodic initial-value problem. The proof combines a Strichartz-type estimate with the contraction mapping principle. Second we establish the existence and orbital stability of periodic and solitary traveling-wave solutions. The stability results are set out in the context of abstract Hamiltonian systems.

Amin Esfahani; Ademir Pastor

2015-01-01T23:59:59.000Z

78

High-Speed Traveling-Wave Electroabsorption Modulators Yi-Jen Chiu, Sheng Z. Zhang,a  

E-Print Network (OSTI)

with long devices and lower drive voltages at 1.55µm wavelength. An InGaAsP/InGaAsP MQW traveling, traveling wave design, microwave transmission, high-speed modulation, InGaAsP. 1. INTRODUCTION External the perpendicular electric field which causes a red-shifted optical absorption so that the optical transmission

Bowers, John

79

Spectral basis neural networks for real-time travel time forecasting  

SciTech Connect

This paper examines how real-time information gathered as part of intelligent transportation systems can be used to predict link travel times for one through five time periods ahead (of 5-min duration). The study employed a spectral basis artificial neural network (SNN) that utilizes a sinusoidal transformation technique to increase the linear separability of the input features. Link travel times from Houston that had been collected as part of the automatic vehicle identification system of the TranStar system were used as a test bed. It was found that the SNN outperformed a conventional artificial neural network and gave similar results to that of modular neural networks. However, the SNN requires significantly less effort on the part of the modeler than modular neural networks. The results, of the best SNN were compared with conventional link travel time prediction techniques including a Kalman filtering model, exponential smoothing model, historical profile, and real-time profile. It was found that the SNN gave the best overall results.

Park, D.; Rilett, L.R.; Han, G.

1999-12-01T23:59:59.000Z

80

On the estimation of arterial route travel time distribution with Markov chains  

E-Print Network (OSTI)

cost, and inherent distributed characteristics lead to tackling GPS-equipped vehicle challenges, Nikolas Geroliminis School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Probe vehicle Travel time distribution Travel time variability a b s t r a c t Recent advances

Moret, Bernard

Note: This page contains sample records for the topic "wave travel time" 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

System of two Hamilton-Jacobi equations for complex-valued travel time  

E-Print Network (OSTI)

System of two Hamilton-Jacobi equations for complex-valued travel time Lud#20;ek Klime#20;s. In real space, the eikonal equation for complex{valued travel time represents the system of two Hamilton of this system of Hamilton{Jacobi equations does not propagate along rays, and has to be solved by more global

Cerveny, Vlastislav

82

Simulation studies on the standing and traveling wave thermoacoustic prime movers  

SciTech Connect

Thermoacoustic systems have been a focus of recent research due to its structural simplicity, high reliability due to absence of moving parts, and can be driven by low grade energy such as fuel, gas, solar energy, waste heat etc. There has been extensive research on both standing wave and traveling wave systems. Towards the development of such systems, simulations can be carried out by several methods such as (a) solving the energy equation, (b) enthalpy flow model, (c) DeltaEC, a free software available from LANL, USA (d) Computational Fluid Dynamics (CFD) etc. We present here the simulation studies of standing wave and traveling wave thermoacoustic prime movers using CFD and DeltaEC. The CFD analysis is carried out using Fluent 6.3.26, incorporating the necessary boundary conditions with different working fluids at different operating pressures. The results obtained by CFD are compared with those obtained using DeltaEC. Also, the CFD simulation of the thermoacoustically driven refrigerator is presented.

Skaria, Mathew; Rasheed, K. K. Abdul; Shafi, K. A. [Department of Mechanical Engineering, TKM College of Engineering, Kollam, Kerala (India); Kasthurirengan, S.; Behera, Upendra [Center for Cryogenic Technology, Indian Institute of Science, Bangalore, Karnataka (India)

2014-01-29T23:59:59.000Z

83

Uncovering the Distribution of Motorists' Preferences for Travel Time and Reliability: Implications for Road Pricing  

E-Print Network (OSTI)

estimate distributions of the values of time and reliabilityDISTRIBUTION OF MOTORISTS' PREFERENCES FOR TRAVEL TIME AND RELIABILITY:and reliability, we maintain that they consider both the central tendency and the dispersion of that distribution.

Small, Kenneth A; Winston, Clifford; Yan, Jia

2002-01-01T23:59:59.000Z

84

Traveling wave pumping of ultra-short pulse x-ray lasers  

SciTech Connect

Pumping of proposed inner-shell photo-ionized (ISPI) x-ray lasers places stringent requirements on the optical pump source. We investigate these requirements for an example x-ray laser (XRL) in Carbon lasing on the 2p-1s transition at 45 A. Competing with this lasing transition is the very fast Auger decay rate out of the upper lasing state, such that the x-ray laser would self-terminate on a femto- second time scale. XRL gain may be demonstrated if pump energy is delivered in a time short when compared to the Auger rate. The fast self-termination also demands that we sequentially pump the length of the x-ray laser at the group velocity of the x-ray laser. This is the classical traveling wave requirement. It imposes a condition on the pumping source that the phase angle of the pump laser be precisely de- coupled from the pulse front angle. At high light intensities, this must be performed with a vacuum grating delay line. We will also include a discussion of issues related to pump energy delivery, i.e. pulse-front curvature, temporal blurring and puke fidelity. An all- reflective optical system with low aberration is investigated to see if it fulfills the requirements. It is expected that these designs together with new high energy (>1J) ultra-short pulse (< 40 fs) pump lasers now under construction may fulfill our pump energy conditions and produce a tabletop x-ray laser.

Snavely, R.A.; Da Silva, L.B.; Eder, D.C.; Matthews, D.L.; Moon, S.J.

1997-11-10T23:59:59.000Z

85

The TauPToo~kit:Flexib/e Seismic Travel-time and Ray-path Utilities  

E-Print Network (OSTI)

The TauPToo~kit:Flexib/e Seismic Travel-time and Ray-path Utilities H. Philip Crotwell, Thomas studies. These factors highlight the need for versatile utilities that allow the calculation of travel to implement this approach. We used Maple (Heal etal., 1996), a symbolic mathematics utility, to help convert

Cerveny, Vlastislav

86

Traveling waves in Hall-magnetohydrodynamics and the ion-acoustic shock structure  

SciTech Connect

Hall-magnetohydrodynamics (HMHD) is a mixed hyperbolic-parabolic partial differential equation that describes the dynamics of an ideal two fluid plasma with massless electrons. We study the only shock wave family that exists in this system (the other discontinuities being contact discontinuities and not shocks). We study planar traveling wave solutions and we find solutions with discontinuities in the hydrodynamic variables, which arise due to the presence of real characteristics in Hall-MHD. We introduce a small viscosity into the equations and use the method of matched asymptotic expansions to show that solutions with a discontinuity satisfying the Rankine-Hugoniot conditions and also an entropy condition have continuous shock structures. The lowest order inner equations reduce to the compressible Navier-Stokes equations, plus an equation which implies the constancy of the magnetic field inside the shock structure. We are able to show that the current is discontinuous across the shock, even as the magnetic field is continuous, and that the lowest order outer equations, which are the equations for traveling waves in inviscid Hall-MHD, are exactly integrable. We show that the inner and outer solutions match, which allows us to construct a family of uniformly valid continuous composite solutions that become discontinuous when the diffusivity vanishes.

Hagstrom, George I.; Hameiri, Eliezer [Courant Institute of Mathematical Sciences, New York, New York 10012 (United States)] [Courant Institute of Mathematical Sciences, New York, New York 10012 (United States)

2014-02-15T23:59:59.000Z

87

Integrating a Traveling Wave Tube into an AECR-U ion source  

SciTech Connect

An RF system of 500W - 10.75 to 12.75 GHz was designed and integrated into the Advanced Electron Cyclotron Resonance - Upgrade (AECR-U) ion source of the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The AECR-U produces ion beams for the Cyclotron giving large flexibility of ion species and charge states. The broadband frequency of a Traveling Wave Tube (TWT) allows modifying the volume that couples and heats the plasma. The TWT system design and integration with the AECR-U ion source and results from commissioning are presented.

Covo, Michel Kireeff; Benitez, Janilee Y.; Ratti, Alessandro; Vujic, Jasmina L.

2011-07-01T23:59:59.000Z

88

High-power and wavelength-tunable traveling-wave semiconductor ring laser  

E-Print Network (OSTI)

in Fig. 3, to direct the TM-mode light to a 50/50 beamsplitter, which deflects 50% of the light out of the ring cavity. With the combination of a Faraday rotator and a X/2-plate, we can operate the ring laser unidirectionally. The direction... of the traveling wave is as indicated in Fig. 1. Unidirectional propagation of light can be achieved as follows: The Faraday rotator is used to rotate the polarization of the light that comes from the k/2-plate by 45', say in the clockwise direction...

Peng, En Titus

2012-06-07T23:59:59.000Z

89

Optimal dimensions minimizing expected travel time of a single machine flow rack AS/RS  

Science Journals Connector (OSTI)

Abstract In this paper, the aim is to determine the optimal dimensions of a flow rack automated storage and retrieval system (AS/RS) using a single machine for storage and retrieval operations. These optimal dimensions are evaluated for minimum expected travel times of the storage and retrieval machine. An enumeration technique is used on a large range of system configurations going from 100 to 20,000 storage segments. Initially, optimization is carried out on six travel time expressions dealing with single and dual cycle travel times considering two dwell point positions. The results are then studied to investigate the influence of travel time expressions on both optimal dimensions and the shape factor of the system rack. Secondly, a new generalized mathematical model was developed by introducing an occurrence proportion parameter, relative to dual cycles, in order to determine the influence of the system functioning (proportion of dual cycles and load rate) on optimal dimensions.

Mohammed Adel Hamzaoui; Zaki Sari

2014-01-01T23:59:59.000Z

90

From average travel time budgets to daily travel time distributions: an appraisal of two conjectures by Klbl and Helbing and some consequences  

E-Print Network (OSTI)

. The analysis shows the link with energy expenditure to be questionable, but also provides alternative views and human energy expenditure for travel, which is assumed to be constant in time and space. The second one because of the improved comfort of cars, carriages or coaches, or because of devices, such as laptop

Toint, Philippe

91

Incident detection using the Standard Normal Deviate model and travel time information from probe vehicles  

E-Print Network (OSTI)

INCIDENT DETECTION USING THE STANDARD iNORMAL DEVIATE MODEL AND TRAVEL TECHIE INFORMATION FROM PROBE VEHICLES A Thesis by CHRISTOPHER EUGENE MOUNTAIN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTFR OF SCIENCE December 1993 Major Subject: Civil Engineering INCIDENT DETECTION USING THE STANDARD NORMAL DEVIATE MODEL AND TRAVEL TIME INFORMATION FROM PROBE VEHICLES A Thesis by CHRISTOPHER EUGENE MOUNTAIN Submitted...

Mountain, Christopher Eugene

2012-06-07T23:59:59.000Z

92

Threshold condition for traveling wave excitation in an annular prime?mover  

Science Journals Connector (OSTI)

The threshold condition for thermoacoustic instability in an annular prime?mover is derived. The region of spatially inhomogeneous temperature distribution (due to the presence of a stack and hot and cold heat exchangers) is assumed to be acoustically thin. The interaction of acoustic waves with the stack is assumed to be quasiadiabatic. Theoretical approach (based on the transformation of differential wave equation into Volterra integral equation which is solved by iterative procedure) is valid for arbitrary spatial temperature distribution. Nevertheless it was found that the threshold for the excitation of a traveling acoustic wave does not depend on the details of temperature spatial distribution but just on the ratio of the temperatures of hot and cold heat exchangers. Moreover the critical temperature ratio does not depend on the thickness of the stack if the acoustic losses inside the heated region are negligible in comparison with acoustic losses in the rest part of the annular system. In this important limiting case critical temperature ratio diminishes when the dimensions of the system are scaled up. [Work supported by DGA.

T. Le Polles; S. Job; H. Bailliet; P. Lotton; M. Bruneau; V. Gusev

1999-01-01T23:59:59.000Z

93

A simple and direct method for generating travelling wave solutions for nonlinear equations  

SciTech Connect

We propose a simple and direct method for generating travelling wave solutions for nonlinear integrable equations. We illustrate how nontrivial solutions for the KdV, the mKdV and the Boussinesq equations can be obtained from simple solutions of linear equations. We describe how using this method, a soliton solution of the KdV equation can yield soliton solutions for the mKdV as well as the Boussinesq equations. Similarly, starting with cnoidal solutions of the KdV equation, we can obtain the corresponding solutions for the mKdV as well as the Boussinesq equations. Simple solutions of linear equations can also lead to cnoidal solutions of nonlinear systems. Finally, we propose and solve some new families of KdV equations and show how soliton solutions are also obtained for the higher order equations of the KdV hierarchy using this method.

Bazeia, D. [Departamento de Fisica, Universidade Federal da Paraiba, 58051-970 Joao Pessoa, PB (Brazil)], E-mail: bazeia@fisica.ufpb.br; Das, Ashok [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171 (United States); Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700064 (India); Losano, L. [Departamento de Fisica, Universidade Federal da Paraiba, 58051-970 Joao Pessoa, PB (Brazil); Silva, A. [Departamento de Fisica, Universidade Federal da Paraiba, 58051-970 Joao Pessoa, PB (Brazil); Departamento de Fisica, Universidade Estadual da Paraiba, Campina Grande, PB (Brazil)

2008-05-15T23:59:59.000Z

94

A finite volume method and experimental study of a stator of a piezoelectric traveling wave rotary ultrasonic motor  

E-Print Network (OSTI)

circuit for the stator of a piezo- electric traveling wave rotary ultrasonic motor is presented ultrasonic motor V. Bolborici a, , F.P. Dawson b , M.C. Pugh c a University of Texas at El Paso, Department of Electrical and Computer Engineering, 500 W. University Ave., El Paso, TX 79968, USA b University of Toronto

Pugh, Mary

95

Wave properties of light Light is energy whose wavelength is the distance traveled in order to complete one cycle.  

E-Print Network (OSTI)

Wave properties of light Light is energy whose wavelength is the distance traveled in order to complete one cycle. The frequency of light refers to the number of cycles in one second. Low-energy light has a long wavelength and a low frequency. High-energy light has a short wavelength and a high

Zworski, Maciej

96

Travel Time Reliability: Its Measurement and Prediction | ornl...  

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

reliability can help agencies understand the performance of their systems and monitor how reliability improves over time. It equips them to answer questions like: What is the...

97

A Legendre-pseudospectral method for computing travelling waves with corners (slope discontinuities) in one space dimension with application to Whitham's equation family  

Science Journals Connector (OSTI)

If the dispersion in a nonlinear hyperbolic wave equation is weak in the sense that the frequency ?(k) of cos(kx) is bounded as k ? ?, it is common that (i) travelling waves exist up to a limiting amplitude with ... Keywords: Whitham equation, cnoidal waves, corner waves, pseudospectral algorithm

John P. Boyd

2003-07-01T23:59:59.000Z

98

Arterial Travel Time Estimation Based On Vehicle Re-Identification Using Magnetic Sensors: Performance Analysis  

E-Print Network (OSTI)

: the arterial travel time estimation system is summarized in Section II. The test site and vehicle detection are explained in Section IV. An analysis of the ground truth and the vehicle detection system data is presented City (Figure 1). The performance of the original system and the system with the modified vehicle re

Horowitz, Roberto

99

Estimation and prediction of travel time from loop detector data for intelligent transportation systems applications  

E-Print Network (OSTI)

for the accuracy of data from a series of detectors for conservation of vehicles, in addition to the commonly adopted checks. ?? A theoretical model based on traffic flow theory for travel time estimation for both off-peak and peak traffic conditions using flow...

Vanajakshi, Lelitha Devi

2005-11-01T23:59:59.000Z

100

Euro Working Group on Transportation 2014 Isolating Different Factors Affecting Travel Time Reliability in an  

E-Print Network (OSTI)

distribution, differently according to the lane. As reliability is based on the percentiles (and not only and tre results are presented in this paper. Keywords: assessment; travel time; reliability;percentile;distribution Reliability in an Observational Before/After Study Neïla Bhouri*, Maurice Aron IFSTTAR,COSYS/GRETTIA, 14-20 bd

Boyer, Edmond

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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

Analytic solutions for seismic travel time and ray path geometry through simple velocity models.  

SciTech Connect

The geometry of ray paths through realistic Earth models can be extremely complex due to the vertical and lateral heterogeneity of the velocity distribution within the models. Calculation of high fidelity ray paths and travel times through these models generally involves sophisticated algorithms that require significant assumptions and approximations. To test such algorithms it is desirable to have available analytic solutions for the geometry and travel time of rays through simpler velocity distributions against which the more complex algorithms can be compared. Also, in situations where computational performance requirements prohibit implementation of full 3D algorithms, it may be necessary to accept the accuracy limitations of analytic solutions in order to compute solutions that satisfy those requirements. Analytic solutions are described for the geometry and travel time of infinite frequency rays through radially symmetric 1D Earth models characterized by an inner sphere where the velocity distribution is given by the function V (r) = A-Br{sup 2}, optionally surrounded by some number of spherical shells of constant velocity. The mathematical basis of the calculations is described, sample calculations are presented, and results are compared to the Taup Toolkit of Crotwell et al. (1999). These solutions are useful for evaluating the fidelity of sophisticated 3D travel time calculators and in situations where performance requirements preclude the use of more computationally intensive calculators. It should be noted that most of the solutions presented are only quasi-analytic. Exact, closed form equations are derived but computation of solutions to specific problems generally require application of numerical integration or root finding techniques, which, while approximations, can be calculated to very high accuracy. Tolerances are set in the numerical algorithms such that computed travel time accuracies are better than 1 microsecond.

Ballard, Sanford

2007-12-01T23:59:59.000Z

102

A crust and upper mantle model of Eurasia and North Africa for Pn travel time calculation  

SciTech Connect

We develop a Regional Seismic Travel Time (RSTT) model and methods to account for the first-order effect of the three-dimensional crust and upper mantle on travel times. The model parameterization is a global tessellation of nodes with a velocity profile at each node. Interpolation of the velocity profiles generates a 3-dimensional crust and laterally variable upper mantle velocity. The upper mantle velocity profile at each node is represented as a linear velocity gradient, which enables travel time computation in approximately 1 millisecond. This computational speed allows the model to be used in routine analyses in operational monitoring systems. We refine the model using a tomographic formulation that adjusts the average crustal velocity, mantle velocity at the Moho, and the mantle velocity gradient at each node. While the RSTT model is inherently global and our ultimate goal is to produce a model that provides accurate travel time predictions over the globe, our first RSTT tomography effort covers Eurasia and North Africa, where we have compiled a data set of approximately 600,000 Pn arrivals that provide path coverage over this vast area. Ten percent of the tomography data are randomly selected and set aside for testing purposes. Travel time residual variance for the validation data is reduced by 32%. Based on a geographically distributed set of validation events with epicenter accuracy of 5 km or better, epicenter error using 16 Pn arrivals is reduced by 46% from 17.3 km (ak135 model) to 9.3 km after tomography. Relative to the ak135 model, the median uncertainty ellipse area is reduced by 68% from 3070 km{sup 2} to 994 km{sup 2}, and the number of ellipses with area less than 1000 km{sup 2}, which is the area allowed for onsite inspection under the Comprehensive Nuclear Test Ban Treaty, is increased from 0% to 51%.

Myers, S; Begnaud, M; Ballard, S; Pasyanos, M; Phillips, W S; Ramirez, A; Antolik, M; Hutchenson, K; Dwyer, J; Rowe, C; Wagner, G

2009-03-19T23:59:59.000Z

103

that minimizes vehicle emissions during design of routes in congested environments with time-dependent travel speeds, hard time windows,  

E-Print Network (OSTI)

that minimizes vehicle emissions during design of routes in congested environments with time emissions, and several laboratory and field methods are available for estimating vehicle emissions rates (1 and then begins to increase again (2); hence, the relationship between emission rates and travel speed

Bertini, Robert L.

104

Travel Reminder The holiday season is a hectic time for international travel. Airports, consulates and ports of entry are  

E-Print Network (OSTI)

and ports of entry are extremely busy due to the large number of travelers and increased security measures passports at most ports of entry as part of the increased security measures effective under the Western

Oklahoma, University of

105

Improved performance of traveling wave directional coupler modulator based on electro-optic polymer  

E-Print Network (OSTI)

Polymer based electro-optic modulators have shown great potentials in high frequency analog optical links. Existing commercial LiNibO3 Mach-Zehnder modulators have intrinsic drawbacks in linearity to provide high fidelity communication. In this paper, we present the design, fabrication and characterization of a traveling wave directional coupler modulator based on electro-optic polymer, which is able to provide high linearity, high speed, and low optical insertion loss. A silver ground electrode is used to reduce waveguide sidewall roughness due to the scattering of UV light in photolithography process in addition to suppressing the RF loss. A 1-to-2 multi-mode interference 3dB-splitter, a photobleached refractive index taper and a quasi-vertical taper are used to reduce the optical insertion loss of the device. The symmetric waveguide structure of the MMI-fed directional coupler is intrinsically bias-free, and the modulation is obtained at the 3-dB point regardless of the ambient temperature. By achieving lo...

Zhang, Xingyu; Lin, Che-yun; Wang, Alan X; Hosseini, Amir; Lin, Xiaohui; Chen, Ray T

2014-01-01T23:59:59.000Z

106

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 16, NO. 6, JUNE 2001 623 MetalSemiconductorMetal Traveling-Wave  

E-Print Network (OSTI)

in high-power distributed PD array or terahertz signal generation. Index Terms--Low-temperature-grown Ga­Semiconductor­Metal Traveling-Wave Photodetectors Jin-Wei Shi, Kian-Giap Gan, Yi-Jen Chiu, Yen-Hung Chen, Chi-Kuang Sun, Member-TWPD). Demonstrated devices were fabricated using low-temperature grown GaAs (LTG-GaAs). In order to achieve high

Bowers, John

107

Traveling-wave laser-produced-plasma energy source for photoionization laser pumping and lasers incorporating said  

DOE Patents (OSTI)

A traveling-wave, laser-produced-plasma, energy source used to obtain single-pass gain saturation of a photoionization pumped laser. A cylindrical lens is used to focus a pump laser beam to a long line on a target. Grooves are cut in the target to present a surface near normal to the incident beam and to reduce the area, and hence increase the intensity and efficiency, of plasma formation.

Sher, Mark H. (Los Altos, CA); Macklin, John J. (Stanford, CA); Harris, Stephen E. (Palo Alto, CA)

1989-09-26T23:59:59.000Z

108

TravInfo Evaluation (Technology Element) Traveler Information Center (TIC) Study: Operator Response Time Analysis  

E-Print Network (OSTI)

Traveler Information Center (TIC) Study Operator Inte$aceTraveler Information Center (TIC) Study Operator ZnterjizceInformation Center (TIC) Study (Technology Evaluation

Miller, Mark A.; Loukakos, Dimitri

2000-01-01T23:59:59.000Z

109

Modified Sagnac experiment for measuring travel-time difference between counter-propagating light beams in a uniformly moving fiber  

E-Print Network (OSTI)

A fiber optic conveyor has been developed for investigating the travel-time difference between two counter-propagating light beams in uniformly moving fiber. Our finding is that there is a travel-time difference Deltat=2vDeltal/c^2 in a fiber segment of length Deltal moving with the source and detector at a speed v, whether the segment is moving uniformly or circularly.

Ruyong Wang; Yi Zheng; Aiping Yao; Dean Langley

2006-09-25T23:59:59.000Z

110

Pressure-time characterization of an internal combustion engine with sinusoidal piston travel  

SciTech Connect

A unique engine configuration called the Stiller-Smith Engine creates a nonconventional pressure versus time response due to the sinusoidal nature of the motion-conversion mechanism. The differences in response are due in part to the utilization of stock piston/cylinder assemblies for engineering prototypes, and the elimination of piston dwell. If all other engine considerations were equal, fuel conversion criteria would at this stage of development favor the slider-crank, but newly identified design and dynamic characteristics of the sinusoidal engine may shift the balance. To understand the differences in potential power, several analytical procedures and experimental tests have been designed to determine the changes in combustion pressure due to sinusoidal piston travel. The experimental results from these test are presented along with a qualitative analysis for future piston/cylinder design requirements.

Smith, J.; Churchill, R.; Woodrow, G.

1987-01-01T23:59:59.000Z

111

Spin oscillations of relativistic fermions in the field of a traveling circularly polarized electromagnetic wave and a constant magnetic field  

E-Print Network (OSTI)

The Dirac equation, in the field of a traveling circularly polarized electromagnetic wave and a constant magnetic field, has singular solutions, corresponding the expansion of energy in vicinity of some singular point. These solutions described relativistic fermions. States relating to these solutions are not stationary. The temporal change of average energy, momentum and spin for single and mixed states is studied in the paper. A distinctive feature of the states is the disappearance of the longitudinal component of the average spin. Another feature is the equivalence of the condition of fermion minimal energy and the classical condition of the magnetic resonance. Finding such solutions assumes the use of a transformation for rotating and co-moving frames of references. Comparison studies of solutions obtained with the Galilean and non-Galilean transformation shown that some parameters of the non-Galilean transformation may be measured in high-energy physics.

Boris V. Gisin

2014-05-13T23:59:59.000Z

112

Electronically controllable transmission line design for traveling wave array antenna feed network  

E-Print Network (OSTI)

In this thesis, an electronically controllable transmission line (ECTL) is presented. By modulating the conductivity of a doped Si modulator in the ECTL, the wave propagation constant in the ECTL is controlled. Measured results show a phase...

Shin, Chang-Seok

2012-06-07T23:59:59.000Z

113

NONLINEAR ELASTIC WAVE NDE II. NONLINEAR WAVE MODULATION SPECTROSCOPY AND NONLINEAR TIME  

E-Print Network (OSTI)

NONLINEAR ELASTIC WAVE NDE II. NONLINEAR WAVE MODULATION SPECTROSCOPY AND NONLINEAR TIME REVERSED. This paper presents the second part of the review of Nonlinear Elastic Wave Spectroscopy (NEWS) in NDE, and describe two different methods of nonlinear NDE that provide not only damage detection but location as well

114

Attitude and acceptance of offshore wind farms—The influence of travel time and wind farm attributes  

Science Journals Connector (OSTI)

Generally people are more positive towards offshore wind farms compared to on-land wind farms. However, the attitudes are commonly assumed to be independent of experience with wind farms. Important relations between attitude and experience might therefore be disregarded. The present paper gives a novel contribution to this field. First of all, we give a thorough review of the studies that have analysed the relation between experience with wind turbines and attitude. In addition, we supplement the review by analysing the effect of travel distance to the nearest offshore wind farm and the wind farms attributes on attitude towards offshore wind farms. The results point towards that the travel time and the attributes of the nearest offshore wind farm influence the attitude significantly. Travel time has mixed effects on the attitude, whilst offshore wind farms with many turbines generate more positive attitudes compared to wind farms with fewer turbines.

Jacob Ladenburg; Bernd Möller

2011-01-01T23:59:59.000Z

115

Using revealed preferences to estimate the Value of Travel Time to recreation sites  

Science Journals Connector (OSTI)

Abstract The opportunity Value of Travel Time (VTT) is one of the most important elements of the total cost of recreation day-trips and arguably the most difficult to estimate. Most studies build upon the theoretical framework proposed by Becker (1965) by using a combination of revealed and stated preference data to estimate a value of time which is uniform in all activities and under all circumstances. This restriction is relaxed by DeSerpa's (1971) model which allows the value of saving time to be activity-specific. We present the first analysis which uses actual driving choices between open access and toll roads to estimate a VTT specific for recreation trips, thereby providing a value which conforms to both Becker's and DeSerpa's theoretical models. Using these findings we conduct a Monte Carlo simulation to identify generalizable results for subsequent valuation studies. Our results indicate that 3/4 of the wage rate provides a reasonable approximation of the average VTT for recreation trips, while the commonly implemented assumption of 1/3 of the wage rate generates downward biased results.

Carlo Fezzi; Ian J. Bateman; Silvia Ferrini

2014-01-01T23:59:59.000Z

116

Gain analysis of higher-order-mode amplification in a dielectric-implanted multi-beam traveling wave structure  

SciTech Connect

A multi-beam traveling wave amplifier designed with an overmoded staggered double grating array was examined by small signal analysis combined with simulation. Eigenmode and S-parameter analyses show that the 2 cm long slow wave structure (SWS) has 1–5 dB insertion loss over the passband (TM{sub 31} mode) with ?28% cold bandwidth. Analytic gain calculation indicates that in the SWS, TM{sub 31}-mode is amplified with 15–20 dB/beam at 64–84 GHz with three elliptical beams of 10 kV and 150 mA/beam, which was compared with particle-in-cell (PIC) simulations. PIC analysis on the analysis of instability with zero-input driving excitations demonstrated that background noises and non-operating lower order modes are noticeably suppressed by implanting equidistant dielectric absorbers; the overmoded structure only allowed the desired 3rd order mode to propagate in the structure. The designed circuit structure can be widely applied to multi-beam devices for high power RF generation.

Gee, Anthony [Department of Physics, Northern Illinois University, Dekalb, Illinois 60115 (United States)] [Department of Physics, Northern Illinois University, Dekalb, Illinois 60115 (United States); Shin, Young-Min [Department of Physics, Northern Illinois University, Dekalb, Illinois 60115 (United States) [Department of Physics, Northern Illinois University, Dekalb, Illinois 60115 (United States); Accelerator Physics Center (APC), Fermi National Accelerator Laboratory (FNAL), Batavia, Illinois 60510 (United States)

2013-07-15T23:59:59.000Z

117

Traveling wave current drive theory for an arbitrary m-polar configuration  

SciTech Connect

An extension of the formalism employed to describe current drive in magnetized plasmas by means of traveling magnetic fields (or double-helix configuration) is presented. In all previous theoretical studies, only driving fields with dipolar topology have been employed and the figure of merit of the current drive mechanism has never been analyzed in terms of the dissipation in the power feeding circuit. In this paper, we show how to express the model equations in terms of the current amplitude in the coils, for an arbitrary number of equally spaced coils wound around the plasma column. We present a brief review of the existing theory and a theoretical formulation, valid for an arbitrary m-polar helical symmetry, which removes the above mentioned complications and limitations. In the limit of straight coils, our magnetic field expression agrees exactly with well-established results of the literature for rotating magnetic field current drive. Finally, we present initial numerical results from a recently developed code which consistently compares the steady driven nonlinear Hall currents and steady fields, corresponding to different configurations in terms of the Ohmic dissipation in the helical coils and discuss future perspectives.

Duarte, V. N. [Instituto de Fisica, Universidade de Sao Paulo, 05508-090 Sao Paulo-SP (Brazil); Clemente, R. A. [Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, 13083-859 Campinas-SP (Brazil); Farengo, R. [Centro Atomico Bariloche and Instituto Balseiro, S. C. de Bariloche (8400), RN (Argentina)

2013-03-15T23:59:59.000Z

118

An Improved Adaptive Exponential Smoothing Model for Short-term Travel Time Forecasting of Urban Arterial Street  

Science Journals Connector (OSTI)

Short-term forecasting of travel time is essential for the success of intelligent transportation system. In this paper, we review the state-of-art of short-term traffic forecasting models and outline their basic ideas, related works, advantages and disadvantages of each model. An improved adaptive exponential smoothing (IAES) model is also proposed to overcome the drawbacks of the previous adaptive exponential smoothing model. Then, comparing experiments are carried out under normal traffic condition and abnormal traffic condition to evaluate the performance of four main branches of forecasting models on direct travel time data obtained by license plate matching (LPM). The results of experiments show each model seems to have its own strength and weakness. The forecasting performance of IASE is superior to other models in shorter forecasting horizon (one and two step forecasting) and the IASE is capable of dealing with all kind of traffic conditions.

Zhi-Peng LI; Hong YU; Yun-Cai LIU; Fu-Qiang LIU

2008-01-01T23:59:59.000Z

119

Self-Heterodyne Spectrometer Using Uni-Traveling-Carrier Photodiodes for Terahertz-Wave Generators and Optoelectronic Mixers  

Science Journals Connector (OSTI)

We demonstrate a self-heterodyne terahertz (THz) frequency-domain spectrometer in which commercially available uni-traveling-carrier photodiodes (UTC-PDs) are used as...

Hisatake, Shintaro; Kim, Jae-Young; Ajito, Katsuhiro; Nagatsuma, Tadao

2014-01-01T23:59:59.000Z

120

The roles of non-extensivity and dust concentration as bifurcation parameters in dust-ion acoustic traveling waves in magnetized dusty plasma  

SciTech Connect

Dust ion-acoustic traveling waves are studied in a magnetized dusty plasma in presence of static dust and non-extensive distributed electrons in the framework of Zakharov-Kuznesstov-Burgers (ZKB) equation. System of coupled nonlinear ordinary differential equations is derived from ZKB equation, and equilibrium points are obtained. Nonlinear wave phenomena are studied numerically using fourth order Runge-Kutta method. The change from unstable to stable solution and consequently to asymptotic stable of dust ion acoustic traveling waves is studied through dynamical system approach. It is found that some dramatical features emerge when the non-extensive parameter and the dust concentration parameters are varied. Behavior of the solution of the system changes from unstable to stable and stable to asymptotic stable depending on the value of the non-extensive parameter. It is also observed that when the dust concentration is increased the solution pattern is changed from oscillatory shocks to periodic solution. Thus, non-extensive and dust concentration parameters play crucial roles in determining the nature of the stability behavior of the system. Thus, the non-extensive parameter and the dust concentration parameters can be treated as bifurcation parameters.

Narayan Ghosh, Uday; Kumar Mandal, Pankaj, E-mail: pankajwbmsd@gmail.com; Chatterjee, Prasanta [Department of Mathematics, Siksha Bhavana Visva Bharati, Santiniketan, West Bengal 731235 (India)] [Department of Mathematics, Siksha Bhavana Visva Bharati, Santiniketan, West Bengal 731235 (India)

2014-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

The study of waves is clearly an important subject in acoustics because sound energy is transmitted by waves traveling though air. Furthermore, it turns out that the  

E-Print Network (OSTI)

Waves The study of waves is clearly an important subject in acoustics because sound energy energy without any net movement of mass. In other words the energy in the wave moves from point A to point B without moving any material from A to B. After transmission of wave energy the medium is left

Robertson, William

122

Travel Medicine  

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

SCOPE OF PROBLEM SCOPE OF PROBLEM * 21% of U.S. Adult Population Travel for Business * 1.4 million International Travelers Daily * Numbers will Increase * Include Workers in Planning TRAVEL AND INFECTIOUS DISEASE * Endemic Exotic Diseases * Antimicrobial Resistance *Non-Specific Presentation of Disease * Emergence/ Re-emergence of Infectious Agents * Importation/ Exportation of Infection Mary L. Doyle, MPH, RN, COHN-S/CM DOE Headquarters January 17,2002 INTERNATIONAL TRAVEL * Economic Expansion * Globalization of Companies * Extended * Extended & Short-tenn Assignments * Multi-National Travel * Circle Globe in Three Days * Incubation Period for Infectious Diseases * Employee Needs Advice from OHN HEALTH ASSESSMENT * Potential Travel Illnesses * Employee Health Risks

123

The Travel-Times of the P- and S-Waves from Mexican Earthquakes  

Science Journals Connector (OSTI)

...excep- tion the fundamental requirement that...interior- wall of boiler-room. This...the buildings safe for operation and providing...amperes for normal operation. A Laon tube...0.1, the fundamental REPORTS AND PAPERS...

Dean S. Carder

124

Seismic Shear Waves in Deep Seismic Reflection Surveys: Some Notes on Problems and Profits  

Science Journals Connector (OSTI)

—Shear (S) waves differ from compressional (P) waves because of their lower propagation velocities, their lower frequencies and due to the different character of their particle motion. The move-out of travel-time...

E. Lüschen

1999-09-01T23:59:59.000Z

125

E-Print Network 3.0 - acoustic waves trapped Sample Search Results  

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

no internal waves so that the acoustic propagation is very clean.Travel times of the first... to the acoustic array. The dashed lines represent the crests of the waves with 160...

126

Enhanced term of order $G^3$ in the light travel time: discussion for some solar system experiments  

E-Print Network (OSTI)

It is generally believed that knowing the light travel time up to the post-post-Minkowskian level (terms in $G^2$) is sufficient for modelling the most accurate experiments designed to test general relativity in a foreseeable future. However, we have recently brought a rigorous justification of the existence of an enhanced term of order $G^3$ which becomes larger than some first-order contributions like the gravitomagnetic effect due to the rotation of the Sun or the solar quadrupole moment for light rays almost grazing the solar surface. We show that this enhanced term must be taken into account in solar system experiments aiming to reach an accuracy less than $10^{-7}$ in measuring the post-Newtonian parameter $\\gamma$.

Pierre Teyssandier; Bernard Linet

2013-12-12T23:59:59.000Z

127

Quantifying Road User Costs with Heterogeneous Value of Motorists' Travel Time  

E-Print Network (OSTI)

to which these factors affect value of time. The major objective of this research is to develop and validate a model that predicts value of time heterogeneously. The data were collected to cover 20 major cities in California. The state of California...

Tiwari, Shashank

2013-08-01T23:59:59.000Z

128

Freely floating structures trapping time-harmonic water waves (revisited)  

E-Print Network (OSTI)

We study the coupled small-amplitude motion of the mechanical system consisting of infinitely deep water and a structure immersed in it. The former is bounded above by a free surface, whereas the latter is formed by an arbitrary finite number of surface-piercing bodies floating freely. The mathematical model of time-harmonic motion is a spectral problem in which the frequency of oscillations serves as the spectral parameter. It is proved that there exist axisymmetric structures consisting of $N \\geq 2$ bodies; every structure has the following properties: (i) a time-harmonic wave mode is trapped by it; (ii) some of its bodies (may be none) are motionless, whereas the rest of the bodies (may be none) are heaving at the same frequency as water. The construction of these structures is based on a generalization of the semi-inverse procedure applied earlier for obtaining trapping bodies that are motionless although float freely.

Nikolay Kuznetsov; Oleg Motygin

2014-10-22T23:59:59.000Z

129

New tools for determining the light travel time in static, spherically symmetric spacetimes beyond the order $G^2$  

E-Print Network (OSTI)

This paper is mainly devoted to the determination of the travel time of a photon as a function of the positions of the emitter and the receiver in a large class of static, spherically symmetric spacetimes. Such a function - often called time transfer function - is of crucial interest for testing metric theories of gravity in the solar system. Until very recently, this function was known only up to the second order in the Newtonian gravitational constant $G$ for a 3-parameter family of static, spherically symmetric metrics generalizing the Schwarzschild metric. We present here two procedures enabling to determine - at least in principle - the time transfer function at any order of approximation when the components of the metric are expressible in power series of the Schwarzschild radius of the central body divided by the radial coordinate. These procedures exclusively work for light rays which may be described as perturbations in power series in $G$ of a Minkowskian null geodesic passing through the positions of the emitter and the receiver. It is shown that the two methodologies lead to the same expression for the time transfer function up to the third order in $G$. The second procedure presents the advantage of exclusively needing elementary integrations which may be performed with any symbolic computer program whatever the order of approximation. The vector functions characterizing the direction of light propagation at the points of emission and reception are derived up to the third order in $G$. The relevance of the third order terms in the time transfer function is briefly discussed for some solar system experiments.

Pierre Teyssandier

2014-07-16T23:59:59.000Z

130

Graduate, Undergraduate Student Travel  

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

Graduate, Undergraduate Travel Graduate, Undergraduate Student Travel Travel reimbursement process information for participants in the Graduate Research Assistant (GRA) and...

131

Jefferson Lab Travel - Training  

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

Tabs Home Announcements Forms Foreign Travel Conferences Travel Reservations Training Travel Guidance Q 'n A print version Individual instruction on travel related topics...

132

Single Antenna Time Reversal of Guided Waves in Pipelines  

Science Journals Connector (OSTI)

The volatile nature of natural gas makes it extremely important to ensure that distribution pipelines remain free from defects as leakage can result in explosions. Many current methods for testing buried pipelines rely on periodic excavation of a section of pipe and attachment of large acoustic or magneto-restrictive sensors. These systems while reliable suffer from a high cost-per-test ratio. Our group hopes to reduce the power constraints of such a detection system in order to allow for permanent installations that monitor the pipelines continuously. We propose to use Time Reversal a signal processing technique in order to achieve this improvement. This paper will focus on the modes generated by various acoustic probing signals and the echoes received with and without Time Reversal. We argue that TR will be most beneficial when there are several dispersive modes present a scenario avoided in conventional techniques. We will present simulation results for the analysis of wave modes in a cylindrical pipe before and after Time Reversal using PZFlex.

Nicholas O'Donoughue; Joel Harley; Jose M. Moura; Yuanwei Jin; Irving Oppenheim; Yujie Ying; Joseph States; James Garrett; Lucio Soibelman

2009-01-01T23:59:59.000Z

133

Observation and modelling of fault-zone fracture seismic anisotropy — I. P, SV and SH travel times  

Science Journals Connector (OSTI)

......Crampin S. 1984. Effective anisotropic elastic constants for wave...3-D laterally inhomogeneous anisotropic media, Geophys. J. R...1981. The mechanisms of anisotropic wave velocity in crystalline...vibrator in near-surface shale. Geophysics, 48, 19-26......

P. C. Leary; Y. G. Li; K. Aki

1987-11-01T23:59:59.000Z

134

Long Wave/Short Wave Resonance in Equatorial Waves  

Science Journals Connector (OSTI)

It is shown that resonant coupling between ultra long equatorial Rossby waves and packets of either short Rossby or short westward-traveling gravity waves is possible. Simple analytic formulas give the discrete value of the packet wave number k, ...

John P. Boyd

1983-03-01T23:59:59.000Z

135

Do Telecommunications Affect Passenger Travel or Vice Versa? Structural Equation Models of Aggregate U.S. Time Series Data Using Composite Indexes  

E-Print Network (OSTI)

D.C. , 1992. The Telecommunications and Travel Behavior3. Mokhtarian, P. L. Telecommunications and Travel: The Caseand S. Marvin. Telecommunications and the City: Electronic

Choo, Sangho; Mokhtarian, Patricia L

2005-01-01T23:59:59.000Z

136

Wave function for harmonically confined electrons in time-dependent electric and magnetostatic fields  

SciTech Connect

We derive via the interaction “representation” the many-body wave function for harmonically confined electrons in the presence of a magnetostatic field and perturbed by a spatially homogeneous time-dependent electric field—the Generalized Kohn Theorem (GKT) wave function. In the absence of the harmonic confinement – the uniform electron gas – the GKT wave function reduces to the Kohn Theorem wave function. Without the magnetostatic field, the GKT wave function is the Harmonic Potential Theorem wave function. We further prove the validity of the connection between the GKT wave function derived and the system in an accelerated frame of reference. Finally, we provide examples of the application of the GKT wave function.

Zhu, Hong-Ming; Chen, Jin-Wang; Pan, Xiao-Yin, E-mail: panxiaoyin@nbu.edu.cn [Department of Physics, Ningbo University, Ningbo 315211 (China)] [Department of Physics, Ningbo University, Ningbo 315211 (China); Sahni, Viraht [Department of Physics, Brooklyn College and The Graduate School of the City University of New York, New York, New York 10016 (United States)] [Department of Physics, Brooklyn College and The Graduate School of the City University of New York, New York, New York 10016 (United States)

2014-01-14T23:59:59.000Z

137

A comparison of periodic travelling wave generation by Robin and Dirichlet boundary conditions in oscillatory reaction–diffusion equations  

Science Journals Connector (OSTI)

......from Hopf bifurcation; indeed, any population cycles that merit the time and expense of spatiotemporal field study will inevitably...Society of Mathematical Biology and by a subsequent e-mail from Nick Britton (University of Bath). I am very grateful to them......

Jonathan A. Sherratt

2008-10-01T23:59:59.000Z

138

Search for gravitational waves associated with the August 2006 timing glitch of the Vela pulsar  

E-Print Network (OSTI)

The physical mechanisms responsible for pulsar timing glitches are thought to excite quasinormal mode oscillations in their parent neutron star that couple to gravitational-wave emission. In August 2006, a timing glitch ...

Barsotti, Lisa

139

Method for estimation of gravitational-wave transient model parameters in frequency-time maps  

E-Print Network (OSTI)

A common technique for detection of gravitational-wave signals is searching for excess power in frequency-time maps of gravitational-wave detector data. In the event of a detection, model selection and parameter estimation will be performed in order to explore the properties of the source. In this paper, we develop a Bayesian statistical method for extracting model-dependent parameters from observed gravitational-wave signals in frequency-time maps. We demonstrate the method by recovering the parameters of model gravitational-wave signals added to simulated advanced LIGO noise. We also characterize the performance of the method and discuss prospects for future work.

Michael Coughlin; Nelson Christensen; Jonathan Gair; Shivaraj Kandhasamy; Eric Thrane

2014-04-17T23:59:59.000Z

140

Travel | Department of Energy  

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

Travel Travel Travel The Travel Services Team serves as the Headquarters POC for the following services: Headquarters Travel Management Center (TMC) Official Travel, Domestic and Foriegn Foreign Travel Management System (FTMS) Official Travel Regulations and Guidelines U.S. Passports and Visa Services (Official and Diplomatic) Non-Refundable Airfare Guidance International Insurance for DOE Officials (MEDEX) RezProfiler Instructions Car Rental Hotel Reservations Travel FAQs For questions about Travel Services or the Travel Management Center, see the Contact Us, Travel Services Section Travel Management Center (TMC) The Travel Services Team oversees the Travel Management Center (TMC), which is operated by ADTRAV Travel Management. Office Hours - 8:00 a.m. to 5:00 p.m. Office Location - Forrestal, Room GE-180

Note: This page contains sample records for the topic "wave travel time" 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

Optimal strategies for gravitational wave stochastic background searches in pulsar timing data  

Science Journals Connector (OSTI)

A low frequency stochastic background of gravitational waves may be detected by pulsar timing experiments in the next 5 to 10 yr. Using methods developed to analyze interferometric gravitational wave data, in this paper we lay out the optimal techniques to detect a background of gravitational waves using a pulsar timing array. We show that for pulsar distances and gravitational wave frequencies typical of pulsar timing experiments, neglecting the effect of the metric perturbation at the pulsar does not result in a significant deviation from optimality. We discuss methods for setting upper limits using the optimal statistic, show how to construct skymaps using the pulsar timing array, and consider several issues associated with realistic analysis of pulsar timing data.

Melissa Anholm; Stefan Ballmer; Jolien D. E. Creighton; Larry R. Price; Xavier Siemens

2009-04-21T23:59:59.000Z

142

P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas  

E-Print Network (OSTI)

This thesis involves inverting the seismic structure of the crust and uppermost mantle in China from the P- and S-wave travel-time tomography. The main contributions of this research are: 1) introducing the adaptive moving ...

Sun, Youshun, 1970-

2005-01-01T23:59:59.000Z

143

Nonlinear time-domain performance model for a wave energy converter...  

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

Time-Domain Performance Model for a Wave Energy Converter in Three Dimensions Ryan G. Coe and Diana L. Bull Water Power Technologies Sandia National Labs Albuquerque, NM 87185-1124...

144

Propagation of sound waves through a spatially homogeneous but smoothly time-dependent medium  

SciTech Connect

The propagation of sound through a spatially homogeneous but non-stationary medium is investigated within the framework of fluid dynamics. For a non-vortical fluid, especially, a generalized wave equation is derived for the (scalar) potential of the fluid velocity distribution in dependence of the equilibrium mass density of the fluid and the sound wave velocity. A solution of this equation for a finite transition period ? is determined in terms of the hypergeometric function for a phenomenologically realistic, sigmoidal change of the mass density and sound wave velocity. Using this solution, it is shown that the energy flux of the sound wave is not conserved but increases always for the propagation through a non-stationary medium, independent of whether the equilibrium mass density is increased or decreased. It is found, moreover, that this amplification of the transmitted wave arises from an energy exchange with the medium and that its flux is equal to the (total) flux of the incident and the reflected wave. An interpretation of the reflected wave as a propagation of sound backward in time is given in close analogy to Feynman and Stueckelberg for the propagation of anti-particles. The reflection and transmission coefficients of sound propagating through a non-stationary medium is analyzed in more detail for hypersonic waves with transition periods ? between 15 and 200 ps as well as the transformation of infrasound waves in non-stationary oceans. -- Highlights: •Analytically exact study of sound propagation through a non-stationary medium. •Energy exchange between the non-stationary medium and the sound wave. •Transformation of hypersonic and ultrasound frequencies in non-stationary media. •Propagation of sound backward in time in close analogy to anti-particles. •Prediction of tsunamis both in spatially and temporally inhomogeneous oceans.

Hayrapetyan, A.G., E-mail: armen@physi.uni-heidelberg.de [Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg (Germany); Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Grigoryan, K.K.; Petrosyan, R.G. [Yerevan State University, 1 Alex Manoogian Str., 0025 Yerevan (Armenia)] [Yerevan State University, 1 Alex Manoogian Str., 0025 Yerevan (Armenia); Fritzsche, S. [Helmholtz-Institut Jena, Fröbelstieg 3, D-07743 Jena (Germany) [Helmholtz-Institut Jena, Fröbelstieg 3, D-07743 Jena (Germany); Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena (Germany)

2013-06-15T23:59:59.000Z

145

Measurement of shear wave velocity of heavy oil De-hua Han, Jiajin Liu, University of Houston  

E-Print Network (OSTI)

for measurement of fluid velocity is to measure the travel time of the transmission wave and then the velocity can water, has been used and is good for P-wave measurement for a lot of fluid samples. But the transmission the principle of this method. The shear wave transducer is coupled with a buffer made of some kind of plastic

146

CA1 neurons in the human hippocampus are critical for autobiographical memory, mental time travel, and autonoetic consciousness  

Science Journals Connector (OSTI)

...Edinburgh Handedness Inventory. The level of education was graded according to the time needed...group, six subjects featured 13 y of education. Autobiographical Memory Assessment...memory and autonoetic consciousness . Poster (600.15) presented at Neuroscience...

Thorsten Bartsch; Juliane Döhring; Axel Rohr; Olav Jansen; Günther Deuschl

2011-01-01T23:59:59.000Z

147

Long-Time Dynamics of Variable Coefficient mKdV Solitary Waves  

E-Print Network (OSTI)

We study the Korteweg-de Vries-type equation dt u=-dx(dx^2 u+f(u)-B(t,x)u), where B is a small and bounded, slowly varying function and f is a nonlinearity. Many variable coefficient KdV-type equations can be rescaled into this equation. We study the long time behaviour of solutions with initial conditions close to a stable, B=0 solitary wave. We prove that for long time intervals, such solutions have the form of the solitary wave, whose centre and scale evolve according to a certain dynamical law involving the function B(t,x), plus an H^1-small fluctuation.

S. I. Dejak; B. L. G. Jonsson

2005-03-08T23:59:59.000Z

148

Nano-Hertz Gravitational Waves Searches with Interferometric Pulsar Timing Experiments  

E-Print Network (OSTI)

We estimate the sensitivity to nano-Hertz gravitational waves of pulsar timing experiments in which two highly-stable millisecond pulsars are tracked simultaneously with two neighboring radio telescopes that are referenced to the same time-keeping subsystem (i.e. "the clock"). By taking the difference of the two time-of-arrival residual data streams we can exactly cancel the clock noise in the combined data set, thereby enhancing the sensitivity to gravitational waves. We estimate that, in the band ($10^{-9} - 10^{-8}$) Hz, this "interferometric" pulsar timing technique can potentially improve the sensitivity to gravitational radiation by almost two orders of magnitude over that of single-telescopes. Interferometric pulsar timing experiments could be performed with neighboring pairs of antennas of the forthcoming large arraying projects.

Massimo Tinto

2011-01-20T23:59:59.000Z

149

A minute-continuous-wave-stabilized picosecond supercontinuum source for ultrafast serial time-encoded amplified microscopy (STEAM)  

Science Journals Connector (OSTI)

A stabilized picosecond supercontinuum source, by a minute continuous-wave trigger, is utilized to improve the ultrafast imaging quality of serial time-encoded amplified microscopy...

Zhang, Chi; Qiu, Yi; Xu, Jianbing; Wong, Kenneth K Y; Tsia, Kevin K

150

Detection of gravitational waves from the QCD phase transition with pulsar timing arrays  

Science Journals Connector (OSTI)

If the cosmological QCD phase transition is strongly first order and lasts sufficiently long, it generates a background of gravitational waves which may be detected via pulsar timing experiments. We estimate the amplitude and the spectral shape of such a background and we discuss its detectability prospects.

Chiara Caprini; Ruth Durrer; Xavier Siemens

2010-09-08T23:59:59.000Z

151

Time-domain model of the ultrasonic wave propagation in an inhomogeneous anisotropic  

E-Print Network (OSTI)

Simulation Multi-Echelle, MSME FRE3160 CNRS, 77454 Marne la Vallée, France guillaume, which allow the measurement of quantitative ultrasonic parameters such as the first arriving signal (FAS structure. A two-dimensional finite element time-domain method is derived to model transient wave

Boyer, Edmond

152

Web Reimbursement Create a Travel Authorization for BCD Travel  

E-Print Network (OSTI)

tickets purchased through BCD Travel directly to departmental General Ledger coding. Create TravelWeb Reimbursement Create a Travel Authorization for BCD Travel 7/19/2012 For Harvard Business Use Only Page 1 Create a Travel Authorization for BCD Travel HARVARD UNIVERSITY Create a Travel

Chen, Yiling

153

Waves  

E-Print Network (OSTI)

Waves is the supporting document to the Master of Fine Arts thesis exhibition of the same title. Exhibited March 7-12 2010 in the Art and Design Gallery at the University of Kansas, Waves was comprised of a series of mixed media drawings...

LaCure, Mari Mae

2010-04-29T23:59:59.000Z

154

Stress-energy tensor in colliding plane wave space-times: An approximation procedure  

E-Print Network (OSTI)

In a recent work on the quantization of a massless scalar field in a particular colliding plane wave space-time, we computed the vacuum expectation value of the stress-energy tensor on the physical state which corresponds to the Minkowski vacuum before the collision of the waves. We did such a calculation in a region close to both the Killing-Cauchy horizon and the folding singularities that such a space-time contains. In the present paper, we give a suitable approximation procedure to compute this expectation value, in the conformal coupling case, throughout the causal past of the center of the collision. This will allow us to approximately study the evolution of such an expectation value from the beginning of the collision until the formation of the Killing-Cauchy horizon. We start with a null expectation value before the arrival of the waves, which then acquires nonzero values at the beginning of the collision and grows unbounded towards the Killing-Cauchy horizon. The value near the horizon is compatible with our previous result, which means that such an approximation may be applied to other colliding plane wave space-times. Even with this approximation, the initial modes propagated into the interaction region contain a function which cannot be calculated exactly and to ensure the correct regularization of the stress-energy tensor with the point-splitting technique, this function must be given up to adiabatic order four of approximation.

Miquel Dorca

1997-11-07T23:59:59.000Z

155

Dynamic diurnal social taxonomy of urban environments using data from a geocoded time use activity-travel diary and point-based business establishment inventory  

Science Journals Connector (OSTI)

Abstract In this paper, we explore the diurnal dynamics of joint activity participation in a small city in Pennsylvania, USA, using behavioral data and an inventory of business establishments. We account for the variation caused by the collective impact of social, temporal and spatial choices of individuals to produce predicted space–time visualizations of activity participation. The focus is on how social contexts of an activity impact the temporal and spatial decisions regarding the activity locations and how this impact varies depending on activity types. A comparison across activity types and social interaction types is made among spatial patterns during a day. The CentreSIM dataset, which is a household-based activity diary survey collected in Centre County (Pennsylvania, USA) in 2003, provides very detailed social interaction information enabling the analysis of social, spatial and temporal aspects of activity participation. In this paper we use this information to develop a spatio-temporal interpolation method and demonstration based on kriging. In this way, we extract the dynamic social taxonomy of places from the behavioral information in the dataset and suggest how urban and transportation models can be informed from the dynamics of places by observing “what is taking place” (activities being pursued in the context of this paper) combined with “what exists” (business establishments) or “what is available” (businesses that are open). The method here can also be used to improve the design of urban environments (e.g., filling gaps in desired activity locations), manage specific places (e.g., extending the opening and closing times of businesses), study transportation policies that are sensitive to time of day (e.g., pricing of parking to discourage crowding and traffic congestion), and modeling of spatio-temporal decisions of social activities in travel demand models (e.g., to guide the development of model specification and representation of the space in which behavioral models are applied).

Seo Youn Yoon; Srinath K. Ravulaparthy; Konstadinos G. Goulias

2014-01-01T23:59:59.000Z

156

Travel Policy | The Ames Laboratory  

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

Policy Travel Policy Travel Policy for Contractor Personnel Travel Policy Changes October 1, 2009 Per Diem Adjustments for Meals Memo or EXAMPLE...

157

On the background estimation by time slides in a network of gravitational wave detectors  

E-Print Network (OSTI)

Time shifting the outputs of Gravitational Wave detectors operating in coincidence is a convenient way to estimate the background in a search for short duration signals. However this procedure is limited as increasing indefinitely the number of time shifts does not provide better estimates. We show that the false alarm rate estimation error saturates with the number of time shifts. In particular, for detectors with very different trigger rates this error saturates at a large value. Explicit computations are done for 2 detectors, and for 3 detectors where the detection statistic relies on the logical ``OR'' of the coincidences of the 3 couples in the network.

Michal Was; Marie-Anne Bizouard; Violette Brisson; Fabien Cavalier; Michel Davier; Patrice Hello; Nicolas Leroy; Florent Robinet; Vavoulidis Miltiadis

2009-11-25T23:59:59.000Z

158

P wave velocity variations in the Coso region, California, derived from  

Open Energy Info (EERE)

P wave velocity variations in the Coso region, California, derived from P wave velocity variations in the Coso region, California, derived from local earthquake travel times Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: P wave velocity variations in the Coso region, California, derived from local earthquake travel times Details Activities (1) Areas (1) Regions (0) Abstract: Inversion of 4036 P wave travel time residuals from 429 local earthquakes using a tomographic scheme provides information about three-dimensional upper crustal velocity variations in the Indian Wells Valley-Coso region of southeastern California. The residuals are calculated relative to a Coso-specific velocity model, corrected for station elevation, weighted, and back-projected along their ray paths through models defined with layers of blocks. Slowness variations in the surface

159

Three-dimensional P and S waves velocity structures of the Coso geothermal  

Open Energy Info (EERE)

P and S waves velocity structures of the Coso geothermal P and S waves velocity structures of the Coso geothermal area, California, from microseismic travel time data Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Three-dimensional P and S waves velocity structures of the Coso geothermal area, California, from microseismic travel time data Details Activities (1) Areas (1) Regions (0) Abstract: High precision P and S wave travel times for 2104 microearthquakes with focus <6 km are used in a non-linear inversion to derive high-resolution three-dimensional compressional and shear velocity structures at the Coso Geothermal Area in eastern California. Block size for the inversion is 0.2 km horizontally and 0.5 km vertically and inversions are investigated in the upper 5 km of the geothermal area.

160

The k-Canadian Travelers Problem with Communication  

Science Journals Connector (OSTI)

From the online point of view, this paper studies a variation of the k-Canadian Traveler Problem (k-CTP), in which there are multiple travelers who communicate with each other to share real-time information. The ...

Huili Zhang; Yinfeng Xu

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

The k-Canadian Travelers Problem with communication  

Science Journals Connector (OSTI)

This paper studies a variation of the online k-Canadian Traveler Problem (k-CTP), in which there are multiple travelers who can communicate with each other, to share real-time blockage information of the edges. W...

Huili Zhang; Yinfeng Xu; Lan Qin

2013-08-01T23:59:59.000Z

162

Shortest Path Scheduler Use the solution to Traveling Salesman  

E-Print Network (OSTI)

: More beneficial to recharge node C, D before B. Spatial Laxity Filling (SLF): Recharge nodes near path due time. SLF: travelling cost 10% smaller than MRF. Reduce travelling cost by recharging nodes near

Wu, Jie

163

Detonation loading of tubes in the modified shear wave speed regime  

E-Print Network (OSTI)

Detonation loading of tubes in the modified shear wave speed regime T. Chao and J. E. Shepherd detonation loading in the modified shear wave speed regime. Strain gauges were used to determine the time and numerical simulations with explicit finite element computation treating the detonation as a traveling load

164

Short time scale thermal mechanical shock wave propagation in high performance microelectronic packaging configuration  

E-Print Network (OSTI)

SHORT TIME SCALE THERMAL MECHANICAL SHOCK WAVE PROPAGATION IN HIGH PERFORMANCE MICROELECTRONIC PACKAGING CONFIGURATION A Thesis by MAHAVIR NAGARAJ Submitted to the Office of Graduate Studies of Texas A&M University... MICROELECTRONIC PACKAGING CONFIGURATION A Thesis by MAHAVIR NAGARAJ Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by: Chii...

Nagaraj, Mahavir

2004-11-15T23:59:59.000Z

165

Travel Policy and Procedures  

Directives, Delegations, and Requirements

To supplement the Federal Travel Regulation (41 CFR, Parts 300-304), the principal source of policy for Federal employee travel and relocation matters, and to establish DOE M 552.1-1, U.S. Department of Energy Travel Manual, dated 09-04-02, as the repository for supplementary travel requirements information for the Department of Energy (DOE). Cancels DOE 1500.2A and DOE 1500.4A. Canceled by DOE O 552.1A.

2002-09-04T23:59:59.000Z

166

Travel Policy and Procedures  

Directives, Delegations, and Requirements

The Order supplements the Federal Travel Regulation as principal source of policy for Federal employee travel and relocation and establishes DOE M 552.1-1A, U.S. Department of Energy Travel Manual, dated 2-17-06, as the repository for supplementary travel requirements information. Cancels DOE O 552.1. Admin Chg 1, dated 10-1-08 cancels DOE O 552.1A.

2006-02-17T23:59:59.000Z

167

Travel Policy and Procedures  

Directives, Delegations, and Requirements

The Order supplements the Federal Travel Regulation as principal source of policy for Federal employee travel and relocation and establishes DOE M 552.1-1A, U.S. Department of Energy Travel Manual, dated 2-17-06, as the DOE repository for supplementary travel requirements information. Cancels DOE O 552.1-1. Canceled by DOE O 552.1A Admin Chg 1.

2006-02-17T23:59:59.000Z

168

Coda-wave interferometry analysis of time-lapse VSP data for monitoring geological carbon sequestration  

SciTech Connect

Injection and movement/saturation of carbon dioxide (CO2) in a geological formation will cause changes in seismic velocities. We investigate the capability of coda-wave interferometry technique for estimating CO2-induced seismic velocity changes using time-lapse synthetic vertical seismic profiling (VSP) data and the field VSP datasets acquired for monitoring injected CO2 in a brine aquifer in Texas, USA. Synthetic VSP data are calculated using a finite-difference elastic-wave equation scheme and a layered model based on the elastic Marmousi model. A possible leakage scenario is simulated by introducing seismic velocity changes in a layer above the CO2 injection layer. We find that the leakage can be detected by the detection of a difference in seismograms recorded after the injection compared to those recorded before the injection at an earlier time in the seismogram than would be expected if there was no leakage. The absolute values of estimated mean velocity changes, from both synthetic and field VSP data, increase significantly for receiver positions approaching the top of a CO2 reservoir. Our results from field data suggest that the velocity changes caused by CO2 injection could be more than 10% and are consistent with results from a crosswell tomogram study. This study demonstrates that time-lapse VSP with coda-wave interferometry analysis can reliably and effectively monitor geological carbon sequestration.

Zhou, R.; Huang, L.; Rutledge, J.T.; Fehler, M.; Daley, T.M.; Majer, E.L.

2009-11-01T23:59:59.000Z

169

STUDENT TRAVEL POLICY APPLICABILITY  

E-Print Network (OSTI)

STUDENT TRAVEL POLICY APPLICABILITY The student travel policy is subject to the standardized the following funding sources: Activity and Services (A & S) fees, Revenues, and Auxiliary fund. The student travel policy incorporates by reference in the University Regulation 4.006 Student Government and Student

Fernandez, Eduardo

170

The relationship of travel agents and consumer travel magazines concerning the travel destinations of tourists using travel agencies  

E-Print Network (OSTI)

important. Also important are travel agents, those professionals who may play a large role in helping tourists determine their travel destinations. Another potentially important factor in determining travel destinations is consumer travel magazines...

Tomlinson, Beverly

2013-02-22T23:59:59.000Z

171

A high-order adaptive time-stepping TVD solver for Boussinesq modeling of breaking waves and coastal inundation  

E-Print Network (OSTI)

A high-order adaptive time-stepping TVD solver for Boussinesq modeling of breaking waves December 2011 Available online 17 December 2011 Keywords: Boussinesq wave model TVD Riemann solver Breaking for the fully nonlinear Boussinesq model of Chen (2006), extended to include moving reference level

Kirby, James T.

172

Self-averaging in time reversal for the parabolic wave equation Guillaume Bal George Papanicolaou y Leonid Ryzhik z  

E-Print Network (OSTI)

is the solution of a transport equation. 1 Introduction In time-reversal experiments a signal emitted, in the regimes of random geometrical optics and radiative transfer (transport), was studied in [2, 3]. We also in the radiative transfer regime using the parabolic wave equation, when the waves interact fully with the random

Bal, Guillaume

173

The k-canadian travelers problem with communication  

Science Journals Connector (OSTI)

From the online point of view, this paper studies a variation of the k-Canadian Traveler Problem (k-CTP), in which there are multiple travelers who communicate with each other to share real-time information. The objective is to find a route from ... Keywords: communication, competitive analysis, multiple travelers, online k-CTP

Huili Zhang; Yinfeng Xu

2011-05-01T23:59:59.000Z

174

Comparison of wave hindcasts, using Wilson's method, with observation and with other hindcast methods  

E-Print Network (OSTI)

and period charact- erising the waves as they leave the generating area. Second is the determination of the travel time for the wave energy to reach the coast and the decrease in height and 1ncrease in per1od accompanying this travel over a region... Africa. Most of the work was done under United States Navy contract by Sverdrup snd Munk. From a study of the processes by which energy is transmitted from wind to ~aves, they der1ved the, energy relations which related wave height and velocity...

Srivastava, Parmatma Saran

2012-06-07T23:59:59.000Z

175

Second Harmonic Resonance for Equatorial Waves  

Science Journals Connector (OSTI)

Simple, exact analytical conditions for second harmonic resonance between equatorial waves are derived. Such resonance can occur only between two Rossby waves or two westward travelling gravity waves. It is shown that regardless of whether the ...

John P. Boyd

1983-03-01T23:59:59.000Z

176

Mapping and Assessment of the United States Ocean Wave Energy...  

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

wave has traveled seven wavelengths, while the wave group as a whole and its associated energy content have advanced only half that distance. ......

177

Official Foreign Travel  

Directives, Delegations, and Requirements

The order establishes requirements and responsibilities governing official foreign travel by Federal and contractor employees. Cancels DOE O 551.1C.

2012-04-12T23:59:59.000Z

178

New method for measuring time-resolved spectra of lanthanide emission using square-wave excitation  

SciTech Connect

A method using modulated continuous wave (CW) visible laser to measure time-resolved fluorescence spectra of trivalent rare-earth ions has been developed. Electro-optic modulator was used to modulate the CW pumping laser with a rise time of 2 ?s. CW Nd{sup 3+} lasers were used as examples to present the method. Upconversion dynamic process of Ho{sup 3+} was studied utilizing a 532 nm CW laser. Quantum cutting dynamic process from Tb{sup 3+} to Yb{sup 3+} was analyzed by a 473 nm CW laser. This method can be applied to any CW laser such as He-Ne laser, Ar{sup +} laser, Kr{sup +} laser, Ti:sapphire laser, etc.

Qin, Feng [Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080 (China); Zhao, Hua; Cai, Wei, E-mail: weicai@hit.edu.cn [School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 (China); Duan, Qianqian [College of Information Engineering, Taiyuan University of Technology, Taiyuan 030024 (China); Zhang, Zhiguo, E-mail: zhangzhiguo@hit.edu.cn [Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080 (China); Laboratory of Sono- and Photo-Theranostic Technologies, Harbin Institute of Technology, Harbin 150080 (China); Cao, Wenwu, E-mail: dzk@psu.edu [Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080 (China); Laboratory of Sono- and Photo-Theranostic Technologies, Harbin Institute of Technology, Harbin 150080 (China); Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)

2013-11-15T23:59:59.000Z

179

A real-time borehole correction of electromagnetic wave resistivity logging while drilling  

Science Journals Connector (OSTI)

Abstract The response of electromagnetic wave logging while drilling is influenced greatly by borehole and drilling fluid resistivity when the size of borehole is relatively large and drilling fluid resistivity is low. Borehole radius and drilling fluid resistivity were introduced to obtain more accurate transformed resistivity on the basis of the commonly used resistivity transformation model. The influence of borehole was considered in the newly established three dimensional transformation model, and a new borehole correction method was proposed. The resistivity transformation database can be established by calculation according to a certain instrument, and the true resistivity is obtained by three dimensional interpolation search technology of real-time correction in practical use. The results of numerical simulation and modeling verification show that the transformed resistivity by real-time correction coincides with the resistivity corrected by charts. The method can eliminate the borehole influence, reduce calculation dimension, and improve the inversion efficiency of highly deviated and horizontal wells logging data.

Zhen YANG; Jinzhou YANG; Laiju HAN

2013-01-01T23:59:59.000Z

180

Gravity perturbed Crapper waves  

Science Journals Connector (OSTI)

...waves are known to have multi-valued height. Using...gravity-capillary waves with multi-valued height. The...of single-valued and multi-valued travelling waves...absence of gravity, a family of exact solutions is...elliptic functions. Building upon the work by Tanveer...

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Friction in Gravitational Waves: a test for early-time modified gravity  

E-Print Network (OSTI)

Modified gravity theories predict in general a non standard equation for the propagation of gravitational waves. Here we discuss the impact of modified friction and speed of tensor modes on cosmic microwave polarization B modes. We show that the non standard friction term, parametrized by $\\alpha_{M}$, is degenerate with the tensor-to-scalar ratio $r$, so that small values of $r$ can be compensated by negative constant values of $\\alpha_M$. We quantify this degeneracy and its dependence on the epoch at which $\\alpha_{M}$ is different from the standard, zero, value and on the speed of gravitational waves $c_{T}$. In the particular case of scalar-tensor theories, $\\alpha_{M}$ is constant and strongly constrained by background and scalar perturbations, $0\\le \\alpha_{M}< 0.01$ and the degeneracy with $r$ is removed. In more general cases however such tight bounds are weakened and the B modes can provide useful constraints on early-time modified gravity.

Valeria Pettorino; Luca Amendola

2014-08-10T23:59:59.000Z

182

Going Green: Traveling in an Environmentally Responsible Manner |  

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

Green: Traveling in an Environmentally Responsible Manner Green: Traveling in an Environmentally Responsible Manner Going Green: Traveling in an Environmentally Responsible Manner September 27, 2010 - 7:30am Addthis John Lippert My wife and I recently took a trip to Virginia Beach. I wanted to visit a research center there. I spent a lot of time at the center, including attending a 3-hour conference session. So really-a main reason for the trip was not leisure. I do admit, however, that my wife and I couldn't go there over a long weekend without squeezing in some time for the ocean. Travel and tourism is one of America's largest industries, responsible for more than $1 trillion in the U.S. economy. According to the U.S. Travel Association, one out of every nine jobs in the United States depends on travel and tourism. The U.S. travel and tourism industry is made up of

183

Going Green: Traveling in an Environmentally Responsible Manner |  

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

Going Green: Traveling in an Environmentally Responsible Manner Going Green: Traveling in an Environmentally Responsible Manner Going Green: Traveling in an Environmentally Responsible Manner September 27, 2010 - 7:30am Addthis John Lippert My wife and I recently took a trip to Virginia Beach. I wanted to visit a research center there. I spent a lot of time at the center, including attending a 3-hour conference session. So really-a main reason for the trip was not leisure. I do admit, however, that my wife and I couldn't go there over a long weekend without squeezing in some time for the ocean. Travel and tourism is one of America's largest industries, responsible for more than $1 trillion in the U.S. economy. According to the U.S. Travel Association, one out of every nine jobs in the United States depends on travel and tourism. The U.S. travel and tourism industry is made up of

184

Chemiluminescence and Ignition Delay Time Measurements of C9H20 Oxidation in O2-Ar Behind Reflected Shock Waves  

E-Print Network (OSTI)

CHEMILUMINESCENCE AND IGNITION DELAY TIME MEASUREMENTS OF C9H20 OXIDATION IN O2-Ar BEHIND REFLECTED SHOCK WAVES A Thesis by BRANDON MICHAEL ROTAVERA Submitted to the Office of Graduate Studies of Texas A&M University... WAVES A Thesis by BRANDON MICHAEL ROTAVERA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved by: Chair of Committee, Eric L...

Rotavera, Brandon

2011-02-22T23:59:59.000Z

185

Transient effects and reconstruction of the energy spectra in the time evolution of transmitted Gaussian wave packets  

E-Print Network (OSTI)

We derive an exact analytical solution to the time-dependent Schr\\"odinger equation for transmission of a Gaussian wave packet through an arbitrary potential of finite range. We consider the situation where the initial Gaussian wave packet is sufficiently broad in momentum space to guarantee that the resonance structure of the system is included in the dynamical description. We demonstrate that the transmitted wave packet exhibits a transient behavior which at very large distances and long times may be written as the free evolving Gaussian wave packet solution times the transmission amplitude of the system and hence it reproduces the resonance spectra of the system. This is a novel result that predicts the ultimate fate of the transmitted Gaussian wave packet. We also prove that at a fixed distance and very long times the solution goes as $t^{-3/2}$ which extends to arbitrary finite range potentials previous analysis on this issue. Our results are exemplified for single and multibarrier systems.

Sergio Cordero; Gaston Garcia-Calderon

2009-08-24T23:59:59.000Z

186

Micro-simulation of daily activity-travel patterns for travel demand forecasting  

Science Journals Connector (OSTI)

The development and initial validation results of a micro-simulator for the generation of daily activity-travel patterns are presented in this paper. The simulator assumes a sequential history and time-of-day ...

Ryuichi Kitamura; Cynthia Chen; Ram M. Pendyala; Ravi Narayanan

187

Travel Request Form  

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

Lodging Lodging Transportation SNAP COLLABORATION MEETING JUNE 1 - 3, 2006 TRAVEL FUNDING REQUEST FORM If you require Travel funding support from LBNL to attend the SNAP Collaboration Meeting, please fill out the travel request form below and click on the "SEND" button. As an alternative, you can simply email the requested information on the form to snap@lbl.gov Deadline: Please submit your request NLT Wednesday, May 10, 2006. Disclaimer: Please note that the submission of this request does not automatically constitute funding approval. 1. First Name Last Name 2. Has this travel funding support been pre-approved by the SNAP management? Yes No 3. If answer to #2 is "Yes": a) Approval by whom? b) What was the maximum reimbursement amount from SNAP?

188

Interviewee Travel Regulations Scope  

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

3/2012 3/2012 Interviewee Travel Regulations Scope These regulations apply to the reimbursement of round-trip travel expenses incurred by interviewees. These regulations do not apply to applicants who live within a 50-mile radius of Los Alamos based on the Rand McNally Standard Highway Mileage Guide. Reimbursement With the exception of airfare, interviewees will be reimbursed for travel expenses according to Federal travel regulations. For interviewees, airfare reimbursement is limited to the lesser of the standard coach airfare or the actual amount paid. The lowest available airfare should be obtained based on the official business dates and locations. The reimbursement amount will be based on the most direct route available between the interviewee's residence and the laboratory. Costs incurred over the lowest available fare will be the

189

Official Foreign Travel  

Directives, Delegations, and Requirements

To establish Department of Energy (DOE) and National Nuclear Security Administration (NNSA) requirements and responsibilities governing official foreign travel by Federal and contractor employees. Cancels DOE O 551.1A. Canceled by DOE O 551.1C.

2003-08-19T23:59:59.000Z

190

Atmospheric Pressure Discharges: Traveling Wave Plasma Sources  

Science Journals Connector (OSTI)

Microwave sustained, atmospheric pressure plasmas are finding an increasing number of applications ... interest in the developing and investigating of appropriate plasma sources [1, 2].

Z. Zakrzewski; M. Moisan

1999-01-01T23:59:59.000Z

191

Time-delay autosynchronization control of defect turbulence in the cubic-quintic complex Ginzburg-Landau equation  

Science Journals Connector (OSTI)

We investigate the effectiveness of a Global time-delay autosynchronization control scheme aimed at stabilizing traveling wave solutions of the cubic-quintic Ginzburg-Landau equation in the Benjamin-Feir-Newell unstable regime. Numerical simulations show that a global control can be efficient and also can create other patterns such as spatiotemporal intermittency regimes, standing waves, or uniform oscillations.

J. B. Gonpe Tafo; L. Nana; T. C. Kofane

2013-09-16T23:59:59.000Z

192

A method for the frequency control in time-resolved two-dimensional gigahertz surface acoustic wave imaging  

SciTech Connect

We describe an extension of the time-resolved two-dimensional gigahertz surface acoustic wave imaging based on the optical pump-probe technique with periodic light source at a fixed repetition frequency. Usually such imaging measurement may generate and detect acoustic waves with their frequencies only at or near the integer multiples of the repetition frequency. Here we propose a method which utilizes the amplitude modulation of the excitation pulse train to modify the generation frequency free from the mentioned limitation, and allows for the first time the discrimination of the resulted upper- and lower-side-band frequency components in the detection. The validity of the method is demonstrated in a simple measurement on an isotropic glass plate covered by a metal thin film to extract the dispersion curves of the surface acoustic waves.

Kaneko, Shogo; Tomoda, Motonobu; Matsuda, Osamu, E-mail: omatsuda@eng.hokudai.ac.jp [Division of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628 (Japan)] [Division of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628 (Japan)

2014-01-15T23:59:59.000Z

193

Estimating wave energy from a wave record  

Science Journals Connector (OSTI)

This note is concerned with the calculation of wave energy from a time series record of wave heights. Various methods are used to estimate the wave energy. For wave records that contain a number of different ... ...

Sasithorn Aranuvachapun; John A. Johnson

1977-01-01T23:59:59.000Z

194

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

E-Print Network (OSTI)

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

Mojzsis, Stephen J.

195

Validating a Time-Dependent Wave-Turbulence-Driven Model of the Solar Wind  

E-Print Network (OSTI)

Although the mechanisms responsible for heating the Sun's corona and accelerating the solar wind are still being actively investigated, it is largely accepted that photospheric motions provide the energy source and that the magnetic field must play a key role in the process. \\citet{2010ApJ...708L.116V} presented a model for heating and accelerating the solar wind based on the turbulent dissipation of Alfv\\'en waves. We first use a time-dependent model of the solar wind to reproduce one of \\citeauthor{2010ApJ...708L.116V}'s solutions; then we extend its application to the case when the energy equation includes thermal conduction and radiation losses, and the upper chromosphere is part of the computational domain. Using this model, we explore parameter space and describe the characteristics of a fast-solar-wind solution. We discuss how this formulation may be applied to a 3D MHD model of the coron a and solar wind \\citep{2009ApJ...690..902L}.

Lionello, Roberto; Downs, Cooper; Linker, Jon A; Miki?, Zoran; Verdini, Andrea

2014-01-01T23:59:59.000Z

196

Zero Energy Travel  

E-Print Network (OSTI)

It is fundamentally possible to travel with zero energy based on Newton Laws of Motion. According to the first law of motion, a body will continue to travel for infinite distance unless it is acted upon by another force. For a body in motion, the force which stops perpetual motion is friction. However, there are many circumstances that friction is zero, for example in space, where there is vacuum. On earth, gravity makes objects to be in constant contact with each other generating friction but technology exists to separate them in the air using powerful magnetic forces. At low speeds, the friction caused by air is minimal but we can create vacuum even on land for high speed travel. Another condition for travelling is for it to stop at its destination. On land, we can recover the kinetic energy back into electrical energy using brushless permanent magnet generators. These generators can also convert electric energy into kinetic energy in order to provide motion. This article reviews technologies that will allow us to travel with zero energy. It is easier to do it on land but in the air, it is not obvious.

Othman Ahmad; Aroland Kiring; Ali Chekima

2012-10-17T23:59:59.000Z

197

Interferometric modeling of wave propagation in inhomogeneous elastic media using time reversal and reciprocity  

E-Print Network (OSTI)

simultaneously, akin to daylight imaging, is inefficient and in all explored cases leads to rela- tively high solutions of the wave equation in different media.The most complete methods of solution, such as finite

198

Initial Waves from Deformable Submarine Landslides: A Study on the Separation Time and Parameter Relationships  

E-Print Network (OSTI)

earth- quakes" and can be determined by the two orders of magnitude energy de ciency between the projected ratio (Newman and Okal, 1998). : : : : 5 1.2 ISSMGE Technical Committee on Landslides (TC-11) classi cation of submarine mass movements adapted.... : : : : : : : : : : : : : : : : : : 12 2.3 Landslide generated waves variables de nition sketch (Synolakis, 2003). : 17 2.4 Photograph of Hammack?s wave tank and piston generator (Hammack, 1973). : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 19 2...

O'Shay, Justin

2012-07-16T23:59:59.000Z

199

Using pulsar timing arrays and the quantum normalization condition to constrain relic gravitational waves  

E-Print Network (OSTI)

In the non-standard model of relic gravitational waves (RGWs) generated in the early universe, the theoretical spectrum of is mainly described by an amplitude $r$ and a spectral index $\\beta$, the latter usually being determined by the slope of the inflation potential. Pulsar timing arrays (PTAs) data have imposed constraints on the amplitude of strain spectrum for a power-law form as a phenomenological model. Applying these constraints to a generic, theoretical spectrum with $r$ and $\\beta$ as independent parameters, we convert the PTAs constraint into an upper bound on the index $\\beta$, which turns out to be less stringent than those upper bounds from BBN, CMB, and LIGO/VIRGO, respectively. Moreover, it is found that PTAs constrain the non-standard RGWs more stringent than the standard RGWs. If the condition of the quantum normalization is imposed upon a theoretical spectrum of RGWs, $r$ and $\\beta$ become related. With this condition, a minimum requirement of the horizon size during inflation is greater than the Planck length results in an upper bound on $\\beta$, which is comparable in magnitude to that by PTAs. When both PTAs and the quantum normalization are applied to a theoretical spectrum of RGWs, constraints can be obtained for other cosmic processes of the early universe, such as the reheating, a process less understood observationally so far. The resulting constraint is consistent with the slow-roll, massive scalar inflation model. The future SKA will be able to constrain RGWs further and might even detect RGWs, rendering an important probe to the very early universe.

Ming-Lei Tong; Yang Zhang; Wen Zhao; Jin-Zhong Liu; Cheng-Shi Zhao; Ting-Gao Yang

2013-11-28T23:59:59.000Z

200

ACADEMIC AFFAIRS TRAVEL POLICIES 10.1 GENERAL TRAVEL INFORMATION  

E-Print Network (OSTI)

must be shown on the TA. The form must be signed by the traveler, the Department Head, and the fund manager for the fund(s) listed. The Provost or his/her designee must approve TAs for Department Head that have been approved by the traveler and their Department Head to the Travel Office for review

Note: This page contains sample records for the topic "wave travel time" 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

2014 Tube -1 STANDING WAVES  

E-Print Network (OSTI)

2014 Tube - 1 STANDING WAVES IN AN AIR COLUMN The objective of the experiment is: · To study the harmonic structure of standing waves in an air column. APPARATUS: Computer, FFTScope software, PC speaker, meterstick, sound tube apparatus, thermometer, microphone INTRODUCTION traveling wave of sinusoidal shape

Glashausser, Charles

202

Abstract--In this study, we analyzed a dataset of time-series vital-signs data collected by standard Propaq travel monitor  

E-Print Network (OSTI)

Abstract--In this study, we analyzed a dataset of time-series vital-signs data collected, USAMRMC, Frederick, MD 21702, and with the Nuclear Engineering Department of the University of Tennessee and diagnostic decision-aid methods, we reviewed a dataset of time-series vital-signs data measured by a standard

203

The k-Canadian Travelers Problem with communication  

Science Journals Connector (OSTI)

This paper studies a variation of the online k-Canadian Traveler Problem (k-CTP), in which there are multiple travelers who can communicate with each other, to share real-time blockage information of the edges. We study two different ... Keywords: Communication, Competitive analysis, Online k-CTP

Huili Zhang; Yinfeng Xu; Lan Qin

2013-08-01T23:59:59.000Z

204

Theoretical modeling of propagation of magneto-acoustic waves in magnetic regions below sunspots  

E-Print Network (OSTI)

We use 2D numerical simulations and eikonal approximation, to study properties of MHD waves traveling below the solar surface through the magnetic structure of sunspots. We consider a series of magnetostatic models of sunspots of different magnetic field strengths, from 10 Mm below the photosphere to the low chromosphere. The purpose of these studies is to quantify the effect of the magnetic field on local helioseismology measurements by modeling waves excited by sub-photospheric sources. Time-distance propagation diagrams and wave travel times are calculated for models of various field strength and compared to the non-magnetic case. The results clearly indicate that the observed time-distance helioseismology signals in sunspot regions correspond to fast MHD waves. The slow MHD waves form a distinctly different pattern in the time-distance diagram, which has not been detected in observations. The numerical results are in good agreement with the solution in the short-wavelength (eikonal) approximation, providing its validation. The frequency dependence of the travel times is in a good qualitative agreement with observations.

E. Khomenko; A. Kosovichev; M. Collados; K. Parchevsky; V. Olshevsky

2008-09-01T23:59:59.000Z

205

Theoretical Modeling of Propagation of Magnetoacoustic Waves in Magnetic Regions Below Sunspots  

Science Journals Connector (OSTI)

We use two-dimensional numerical simulations and eikonal approximation to study properties of magnetohydrodynamic (MHD) waves traveling below the solar surface through the magnetic structure of sunspots. We consider a series of magnetostatic models of sunspots of different magnetic field strengths, from 10 Mm below the photosphere to the low chromosphere. The purpose of these studies is to quantify the effect of the magnetic field on local helioseismology measurements by modeling waves excited by subphotospheric sources. Time-distance propagation diagrams and wave travel times are calculated for models of various field strengths and compared to the nonmagnetic case. The results clearly indicate that the observed time-distance helioseismology signals in sunspot regions correspond to fast MHD waves. The slow MHD waves form a distinctly different pattern in the time-distance diagram, which has not been detected in observations. The numerical results are in good agreement with the solution in the short-wavelength (eikonal) approximation, providing its validation. The frequency dependence of the travel times is in good qualitative agreement with observations.

E. Khomenko; A. Kosovichev; M. Collados; K. Parchevsky; V. Olshevsky

2009-01-01T23:59:59.000Z

206

The health implications of inequalities in travel  

Science Journals Connector (OSTI)

Abstract The purpose of this paper is to examine whether some groups in society have poorer travel opportunities or are affected adversely by transport more than others with consequent implications for their health. The following potential inequalities in access to travel are considered: income, ethnicity, gender, rurality and disability. The impacts of two externalities of the transport system are considered: casualty rates and atmospheric emissions. Access to a car is found to be a key factor. Generally, the inequalities are decreasing over time as those with lower incomes increase their car ownership towards the levels of those with higher incomes.

Roger L. Mackett

2014-01-01T23:59:59.000Z

207

VTIS: A Volunteered Travelers Information System  

Science Journals Connector (OSTI)

VTIS is a dynamic notification system that takes in a user's route and calculates the time-delay imposed by disruptions to the normal traversal. The disruptions are calculated by using crowdsourced notifications. This is accomplished by the creation ... Keywords: ITS, crowdsource, data mining, traveler information system, twitter

Roland Varriale; Shuo Ma; Ouri Wolfson

2013-11-01T23:59:59.000Z

208

Short-time-evolved wave functions for solving quantum many-body problems  

E-Print Network (OSTI)

, in the case of the linear and quadratic wave function, the above can be expressed as E5E dRdSLdSRp~R ,SL ,SR!EL~R ,SL ,SR!, ~17! where p(R ,SL ,SR) is the probability density function, EL(R ,SL ,SR) is the local energy, and SL ,R are the respective left...

Ciftja, O.; Chin, Siu A.

2003-01-01T23:59:59.000Z

209

A Rigorous Time-Domain Analysis of Full--Wave Electromagnetic Cloaking (Invisibility)  

E-Print Network (OSTI)

There is currently a great deal of interest in the theoretical and practical possibility of cloaking objects from the observation by electromagnetic waves. The basic idea of these invisibility devices \\cite{glu1, glu2, le},\\cite{pss1} is to use anisotropic {\\it transformation media} whose permittivity and permeability $\\var^{\\lambda\

Ricardo Weder

2007-04-02T23:59:59.000Z

210

Changing forms and sudden smooth transitions of tsunami waves  

E-Print Network (OSTI)

Changing forms and sudden smooth transitions of tsunami waves R. H. J. Grimshaw1 , J. C. R. Hunt1 Engineering, University of Hong Kong, Hong Kong August 14, 2014 Abstract In some tsunami waves travelling over" wave. Shallow water theory shows that the latter travels faster than the former and, according

211

Modeling and simulation of blast-induced, early-time intracranial wave physics leading to traumatic brain injury.  

SciTech Connect

The objective of this modeling and simulation study was to establish the role of stress wave interactions in the genesis of traumatic brain injury (TBI) from exposure to explosive blast. A high resolution (1 mm{sup 3} voxels), 5 material model of the human head was created by segmentation of color cryosections from the Visible Human Female dataset. Tissue material properties were assigned from literature values. The model was inserted into the shock physics wave code, CTH, and subjected to a simulated blast wave of 1.3 MPa (13 bars) peak pressure from anterior, posterior and lateral directions. Three dimensional plots of maximum pressure, volumetric tension, and deviatoric (shear) stress demonstrated significant differences related to the incident blast geometry. In particular, the calculations revealed focal brain regions of elevated pressure and deviatoric (shear) stress within the first 2 milliseconds of blast exposure. Calculated maximum levels of 15 KPa deviatoric, 3.3 MPa pressure, and 0.8 MPa volumetric tension were observed before the onset of significant head accelerations. Over a 2 msec time course, the head model moved only 1 mm in response to the blast loading. Doubling the blast strength changed the resulting intracranial stress magnitudes but not their distribution. We conclude that stress localization, due to early time wave interactions, may contribute to the development of multifocal axonal injury underlying TBI. We propose that a contribution to traumatic brain injury from blast exposure, and most likely blunt impact, can occur on a time scale shorter than previous model predictions and before the onset of linear or rotational accelerations traditionally associated with the development of TBI.

Ford, Corey C. (University of New Mexico, Albuquerque, NM); Taylor, Paul Allen

2008-02-01T23:59:59.000Z

212

SPECTRAL STABILITY FOR SUBSONIC TRAVELING PULSES OF THE BOUSSINESQ `ABC' SYSTEM  

E-Print Network (OSTI)

SPECTRAL STABILITY FOR SUBSONIC TRAVELING PULSES OF THE BOUSSINESQ `ABC' SYSTEM SEVDZHAN HAKKAEV-pulsed traveling wave solutions. In [11], Chen-Chen-Nguyen consider another relevant case, namely the BBM system system as well as its relations to the single BBM equation. Date: March 5, 2013. 2000 Mathematics Subject

Stefanov, Atanas G.

213

SPECTRAL STABILITY FOR SUBSONIC TRAVELING PULSES OF THE BOUSSINESQ `ABC' SYSTEM  

E-Print Network (OSTI)

SPECTRAL STABILITY FOR SUBSONIC TRAVELING PULSES OF THE BOUSSINESQ `ABC' SYSTEM SEVDZHAN HAKKAEV-pulsed traveling wave solutions. In [11], Chen-Chen-Nguyen consider another relevant case, namely the BBM system, as well as in more general situations. In [2], the authors explore the existence theory for the BBM system

Stanislavova, Milena

214

Real-time Non-contact Millimeter Wave Characterization of Water-Freezing and Ice-Melting Dynamics  

SciTech Connect

We applied millimeter wave radiometry for the first time to monitor water-freezing and ice-melting dynamics in real-time non-contact. The measurements were completed at a frequency of 137 GHz. Small amounts (about 2 mL) of freshwater or saltwater were frozen over a Peltier cooler and the freezing and melting sequence was recorded. Saltwater was prepared in the laboratory that contained 3.5% of table salt to simulate the ocean water. The dynamics of freezing-melting was observed by measuring the millimeter wave temperature as well as the changes in the ice or water surface reflectivity and position. This was repeated using large amounts of freshwater and saltwater (800 mL) mimicking glaciers. Millimeter wave surface level fluctuations indicated as the top surface melted, the light ice below floated up indicating lower surface temperature until the ice completely melted. Our results are useful for remote sensing and tracking temperature for potentially large-scale environmental applications, e.g., global warming.

Sundaram, S. K.; Woskov, Paul P.

2008-11-12T23:59:59.000Z

215

Optical pin apparatus for measuring the arrival time and velocity of shock waves and particles  

DOE Patents (OSTI)

An apparatus for the detection of the arrival and for the determination of the velocity of disturbances such as shock-wave fronts and/or projectiles. Optical pins using fluid-filled microballoons as the light source and an optical fiber as a link to a photodetector have been used to investigate shock-waves and projectiles. A microballoon filled with a noble gas is affixed to one end of a fiber-optic cable, and the other end of the cable is attached to a high-speed streak camera. As the shock-front or projectile compresses the microballoon, the gas inside is heated and compressed producing a bright flash of light. The flash of light is transmitted via the optic cable to the streak camera where it is recorded. One image-converter streak camera is capable of recording information from more than 100 microballoon-cable combinations simultaneously.

Benjamin, R.F.

1983-10-18T23:59:59.000Z

216

Optical pin apparatus for measuring the arrival time and velocity of shock waves and particles  

DOE Patents (OSTI)

An apparatus for the detection of the arrival and for the determination of the velocity of disturbances such as shock-wave fronts and/or projectiles. Optical pins using fluid-filled microballoons as the light source and an optical fiber as a link to a photodetector have been used to investigate shock-waves and projectiles. A microballoon filled with a noble gas is affixed to one end of a fiber-optic cable, and the other end of the cable is attached to a high-speed streak camera. As the shock-front or projectile compresses the microballoon, the gas inside is heated and compressed producing a bright flash of light. The flash of light is transmitted via the optic cable to the streak camera where it is recorded. One image-converter streak camera is capable of recording information from more than 100 microballoon-cable combinations simultaneously.

Benjamin, Robert F. (315 Rover Blvd., Los Alamos, NM 87544)

1987-01-01T23:59:59.000Z

217

Optical pin apparatus for measuring the arrival time and velocity of shock waves and particles  

DOE Patents (OSTI)

An apparatus is disclosed for the detection of the arrival and for the determination of the velocity of disturbances such as shock-wave fronts and/or projectiles. Optical pins using fluid-filled microballoons as the light source and an optical fiber as a link to a photodetector have been used to investigate shock-waves and projectiles. A microballoon filled with a noble gas is affixed to one end of a fiber-optic cable, and the other end of the cable is attached to a high-speed streak camera. As the shock-front or projectile compresses the microballoon, the gas inside is heated and compressed producing a bright flash of light. The flash of light is transmitted via the optic cable to the streak camera where it is recorded. One image-converter streak camera is capable of recording information from more than 100 microballoon-cable combinations simultaneously. 3 figs.

Benjamin, R.F.

1987-03-10T23:59:59.000Z

218

Periodic wave patterns of two-dimensional Boussinesq systems  

E-Print Network (OSTI)

Feb 9, 2006 ... Abstract. We prove the existence of a large family of two-dimensional travelling wave patterns for a Boussinesq system which describes.

2006-06-09T23:59:59.000Z

219

The dispersive Alfven wave in the time-stationary limit with a focus on collisional and warm-plasma effects  

SciTech Connect

A nonlinear, collisional, two-fluid model of uniform plasma convection across a field-aligned current (FAC) sheet, describing the stationary Alfven (StA) wave, is presented. In a previous work, Knudsen showed that, for cold, collisionless plasma [D. J. Knudsen, J. Geophys. Res. 101, 10761 (1996)], the stationary inertial Alfven (StIA) wave can accelerate electrons parallel to a background magnetic field and cause large, time-independent plasma-density variations having spatial periodicity in the direction of the convective flow over a broad range of spatial scales and energies. Knudsen suggested that these fundamental properties of the StIA wave may play a role in the formation of discrete auroral arcs. Here, Knudsen's model has been generalized for warm, collisional plasma. From this generalization, it is shown that nonzero ion-neutral and electron-ion collisional resistivity significantly alters the perpendicular ac and dc structure of magnetic-field-aligned electron drift, and can either dissipate or enhance the field-aligned electron energy depending on the initial value of field-aligned electron drift velocity. It is also shown that nonzero values of plasma pressure increase the dominant Fourier component of perpendicular wavenumber.

Finnegan, S. M.; Koepke, M. E. [Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315 (United States); Knudsen, D. J. [Department of Physics and Astronomy, University of Calgary, Calgary, Alberta (Canada)

2008-05-15T23:59:59.000Z

220

Flaw Shape Reconstruction from SH-Wave Array Ultrasonic Data Using Time Domain Linearized Inverse Scattering Method  

SciTech Connect

A linearized inverse scattering method, so called the Kirchhoff inversion, is formulated in time domain for SH-waves measured by a contact ultrasonic transducer and tested using experimental data. The data for reconstruction are experimentally obtained by measuring ultrasonic echoes from artificial flaws in steel plate specimens. For an efficient and accurate data collection, a contact SH-wave linear array transducer is used. The shapes of the artificial flaws are reconstructed by the Kirchhoff inversion and the conventional SAFT (Synthetic Aperture Focusing Technique) using the waves from a single ray path. Comparison of the two methods shows that the Kirchhoff inversion works well for experimental data and outperforms SAFT although only an illuminated portion of the flaw boundaries is reconstructed by either method. In order to gain more information on the flaw boundaries, the Kirchhoff inversion which takes into account multiple ray paths is also tested with the same experimental data. As a result, it is shown that a larger part of the flaw boundaries can be visualized by considering the multiple ray paths.

Kimoto, K.; Hirose, S. [Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552 (Japan)

2005-04-09T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Petroleum Reduction Strategies to Reduce Vehicle Miles Traveled |  

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

Reduce Vehicle Miles Traveled Reduce Vehicle Miles Traveled Petroleum Reduction Strategies to Reduce Vehicle Miles Traveled October 7, 2013 - 11:52am Addthis YOU ARE HERE: Step 3 For reducing greenhouse gas emissions, the table below describes petroleum reduction strategies to reduce vehicle miles traveled, as well as guidance and best practices for each strategy. Table 1. Determining When and How to Promote the Use of Strategies to Reduce Vehicle Miles Traveled Strategy When Applicable Best Practices Consolidate trips Applicable to all vehicles, regardless of ownership or vehicle and fuel type Target vehicle operators who take longer trips Seek vehicle operator input and collaboration to identify regular or occasional trips that involve similar routes. Determine whether trips on multiple days or times can be consolidated into a single trip.

222

Speed selection for coupled wave equations  

E-Print Network (OSTI)

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

Mariano Cadoni; Giuseppe Gaeta

2015-01-13T23:59:59.000Z

223

Estimating ocean wave directional spreading from an Eulerian surface elevation time history  

Science Journals Connector (OSTI)

...an Eulerian surface elevation time history T. A. A. Adcock * P. H. Taylor...st-peters.oxon.org ). Department of Engineering Science, University of Oxford...information available is the time history of free surface elevation at a single...

2009-01-01T23:59:59.000Z

224

Low-coherence doppler lidar with multiple time coherence of reference and probe waves  

Science Journals Connector (OSTI)

The notion of multiple time coherence of optical beams is introduced and mathematically ... pulses (MFPs), which exhibit multiple time coherence, and the possibility of their application for ... is based on nanos...

G. G. Matvienko; S. N. Polyakov; V. K. Oshlakov

2007-11-01T23:59:59.000Z

225

Non-Born–Oppenheimer molecular wave functions of H2 by extended multi-configuration time-dependent Hartree–Fock method  

Science Journals Connector (OSTI)

Abstract A ground state wave function of a one-dimensional H2 molecule is derived numerically by the extended multi-configuration time-dependent Hartree–Fock (MCTDHF) method. The electronic orbitals and the amplitudes for the nuclear motion constituting the ground-state wave function are derived by solving the coupled equations of motion by the imaginary time propagation. Comparisons with the results obtained by the Born–Huang (BH) expansion method as well as with the exact wave function reveal that the memory size required in the extended MCTDHF method is about two orders of magnitude smaller than in the BH expansion method.

Yoshihiro Ide; Tsuyoshi Kato; Kaoru Yamanouchi

2014-01-01T23:59:59.000Z

226

Travel and Expense Update www.bc.edu/travel  

E-Print Network (OSTI)

international flights into the US. TSA Officers may ask travelers to power up devices such as laptops and phones will be charged). JetBlue ­ Changes at Logan Airport Please note, flights from BOS-DCA will no longer operate out one of our approved travel agencies. · Flat fare of $99 (taxes not included) each way from Boston

Huang, Jianyu

227

Reconstruction of microseismogram from various waves in a borehole  

E-Print Network (OSTI)

. D. Neve s (Member) T. W. encer (M ber) T. R. Fischer (Member) W. B. Jones, Jr. (Head of Department) August 1983 ABSTRACT Reconstruct1on of Microseismograms from Various Waves in a Borehole (August 1983) Soetjipno Soetandio, B. S. , Texas... function in time-domain Source function in frequency-domain 20 21 Laplace contour in the complex w-plane and the singularities in the k - plane z 23 Compressional and shear wave travel paths . 26 Location of Bessel functions arguments 28 Acoustic...

Soetandio, Soetjipno

1983-01-01T23:59:59.000Z

228

Developmental programming: Prenatal BPA treatment disrupts timing of LH surge and ovarian follicular wave dynamics in adult sheep  

Science Journals Connector (OSTI)

Abstract Developmental exposure to BPA adversely affects reproductive function. In sheep, prenatal BPA treatment induces reproductive neuroendocrine defects, manifested as LH excess and dampened LH surge and perturbs early ovarian gene expression. In this study we hypothesized that prenatal BPA treatment will also disrupt ovarian follicular dynamics. Pregnant sheep were treated from days 30 to 90 of gestation with 3 different BPA doses (0.05, 0.5, or 5 mg/kg BW/day). All female offspring were estrus synchronized and transrectal ultrasonography was performed daily for 22 days to monitor ovarian follicular and corpora lutea dynamics. Blood samples were collected to assess preovulatory hormonal changes and luteal progesterone dynamics. Statistical analysis revealed that the time interval between the estradiol rise and the preovulatory LH surge was shortened in the BPA-treated females. None of the three BPA doses had an effect on corpora lutea, progestogenic cycles, and mean number or duration of ovulatory and non-ovulatory follicles. However, differences in follicular count trajectories were evident in all three follicular size classes (2–3 mm, 4–5 mm, and ? 6 mm) of prenatal BPA-treated animals compared to controls. Number of follicular waves tended also to be more variable in the prenatal BPA-treated groups ranging from 2 to 5 follicular waves per cycle, while this was restricted to 3 to 4 waves in control females. These changes in ovarian follicular dynamics coupled with defects in time interval between estradiol rise and preovulatory LH release are likely to lead to subfertility in prenatal BPA-treated females.

A. Veiga-Lopez; E.M. Beckett; B. Abi Salloum; W. Ye; V. Padmanabhan

2014-01-01T23:59:59.000Z

229

Segmented Waves from a Spatiotemporal Transverse Wave Instability Lingfa Yang, Igal Berenstein, and Irving R. Epstein*  

E-Print Network (OSTI)

Segmented Waves from a Spatiotemporal Transverse Wave Instability Lingfa Yang, Igal Berenstein observe traveling waves emitted from Turing spots in the chlorine dioxide-iodine-malonic acid reaction. The newborn waves are continuous, but they break into segments as they propagate, and the propagation

Epstein, Irving R.

230

Generation of matter-wave solitons of the Gross-Pitaevskii equation with a time-dependent complicated potential  

Science Journals Connector (OSTI)

We examine the generation of bright matter-wave solitons in the Gross-Pitaevskii equation describing Bose-Einstein condensates with a time-dependent complex potential, which is composed of a repulsive parabolic background potential and a gravitational field. By performing a modified lens-type transformation, an explicit expression for the growth rate of a purely growing modulational instability is presented and analyzed. We point out the effects of the gravitational field, as well as of the parameter related to the feeding or loss of atoms in the condensate, on the instability growth rate. It is evident from numerical simulations that the feeding with atoms and the magnetic trap have opposite effects on the dynamics of the system. It is shown that the feeding or loss parameter can be well used to control the instability domain. Our study shows that the gravitational field changes the condensate trail of the soliton trains during the propagation. We also perform a numerical analysis to solve the Gross-Pitaevskii equation with a time-dependent complicated potential. The numerical results on the effect of both the gravitational field and the parameter of feeding or loss of atoms in the condensate agree well with predictions of the linear stability analysis. Another result of the present work is the modification of the background wave function in the Thomas-Fermi approximation during the numerical simulations.

Alidou Mohamadou; Etienne Wamba; Serge Y. Doka; Thierry B. Ekogo; Timoleon C. Kofane

2011-08-01T23:59:59.000Z

231

NEUP Student Travel Request Form | Department of Energy  

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

Student Travel Request Form NEUP Student Travel Request Form NEUP Fellowship Travel Request Form Student Travel Request Form.pdf More Documents & Publications Investing in the next...

232

Handbook for Travellers in Norway  

Science Journals Connector (OSTI)

... of tourist invasion is curiously displayed by reference to the various editions of Murray's Handbooks. We have before us the tattered remnants of our old travelling companion and oracle- ... us the tattered remnants of our old travelling companion and oracle-Part 1 of the "Handbook for Northern Europe,"including Denmark, N orway, and Sweden (1849). We are ...

W. M. W.

1892-08-25T23:59:59.000Z

233

Seismic Travel-Time Residuals and Plates  

Science Journals Connector (OSTI)

......United States, Canada and Greenland under the auspices of Project Vela Uniform (Long Range Seismic Measurements 1966). Arrival...1 that if we plot residuals on the focal sphere, we are at liberty to ascribe these residuals to source effects, receiver effects......

D. Davies; D. P. McKenzie

1969-09-01T23:59:59.000Z

234

A real-time heart rate analysis for a remote millimeter wave I-Q sensor.  

SciTech Connect

This paper analyzes heart rate (HR) information from physiological tracings collected with a remote millimeter wave (mmW) I-Q sensor for biometric monitoring applications. A parameter optimization method based on the nonlinear Levenberg-Marquardt algorithm is used. The mmW sensor works at 94 GHz and can detect the vital signs of a human subject from a few to tens of meters away. The reflected mmW signal is typically affected by respiration, body movement, background noise, and electronic system noise. Processing of the mmW radar signal is, thus, necessary to obtain the true HR. The down-converted received signal in this case consists of both the real part (I-branch) and the imaginary part (Q-branch), which can be considered as the cosine and sine of the received phase of the HR signal. Instead of fitting the converted phase angle signal, the method directly fits the real and imaginary parts of the HR signal, which circumvents the need for phase unwrapping. This is particularly useful when the SNR is low. Also, the method identifies both beat-to-beat HR and individual heartbeat magnitude, which is valuable for some medical diagnosis applications. The mean HR here is compared to that obtained using the discrete Fourier transform.

Bakhtiari, S.; Liao, S.; Elmer, T.; Gopalsami, N.; Raptis, A. C. (Nuclear Engineering Division)

2011-06-01T23:59:59.000Z

235

E-Print Network 3.0 - asymmetric traveling salesman Sample Search...  

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

problem such as maximum weight Summary: (time permitting) Approximation Algorithms: Set Cover, Traveling Salesman Edited March 2006 (html, css Source: Saniie, Jafar -...

236

Analogs of wave function reduction, quantum entanglement and EPR experiment in classical physics of spacetimes with time machines  

E-Print Network (OSTI)

It is theoretically revealed that, in classical physics of spacetimes with wormholes, there are analogs of wave function reduction events, quantum entanglement and Einstein-Podolsky-Rosen (EPR) experiment. Within the suggested approach, wormholes are specified by a typical microscopic radius of their mouths, and this causes the size effect in operation of wormhole-based time machines (closed timelike curves; CTCs). For geometric reasons, classical solid balls in a spacetime with a wormhole are divided into the two categories: small and large balls whose traverse through wormholes is permitted and forbidden, respectively. Evolutions of small balls on CTCs can be self-inconsistent (or, in other terms, inconsistent with conventional causality), in which case there is an uncertainty in their behaviors. In contrast, evolutions of large solid balls are always unambiguous. In the situation where small balls can be absorbed by large balls, uncertain behaviors of small balls transform into unambiguous evolutions of large balls in the logical way analogous to that of a quantum measurement - wave function reduction - event. Also, within the suggested approach operating with classical balls in spacetimes with wormholes, analogs of quantum entanglement and EPR experiment are defined and theoretically described.

I. A. Ovid'ko

2012-01-05T23:59:59.000Z

237

ADMINISTRATIVE RECORDS SCHEDULE 9: TRAVEL AND TRANSPORTATION...  

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

9: TRAVEL AND TRANSPORTATION RECORDS ADMINISTRATIVE RECORDS SCHEDULE 9: TRAVEL AND TRANSPORTATION RECORDS This schedule covers records documenting the movement of goods and persons...

238

ADMINISTRATIVE RECORDS SCHEDULE 9: TRAVEL AND TRANSPORTATION...  

Energy Savers (EERE)

9: TRAVEL AND TRANSPORTATION RECORDS (Revision 2) ADMINISTRATIVE RECORDS SCHEDULE 9: TRAVEL AND TRANSPORTATION RECORDS (Revision 2) This schedule covers records documenting the...

239

NREL: Climate Neutral Research Campuses - Business Travel  

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

of business travel. Several options have emerged to reduce andor offset greenhouse gas (GHG) emissions related to business travel. These options include: Teleconferencing:...

240

On plane waves in diluted relativistic cold plasmas  

E-Print Network (OSTI)

We briefly report on some exact results [G. Fiore, arXiv:1312.4665 preprint, to appear in J. Phys. A] regarding plane waves in a relativistic cold plasma. If the plasma, initially at rest, is reached by a transverse plane electromagnetic travelling-wave, then its motion has a very simple dependence on this wave in the limit of zero density, otherwise can be determined by an iterative procedure whose accuracy decreases with time or the plasma density. Thus one can describe in particular the impact of a very intense and short laser pulse onto a plasma and determine conditions for the "slingshot effect" [G. Fiore, R. Fedele, U. De Angelis, arXiv:1309.1400 preprint] to occur. The motion in vacuum of a charged test particle subject to a wave of the same kind is also determined, for any initial velocity.

Gaetano Fiore

2014-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Relating gravitational wave constraints from primordial nucleosynthesis, pulsar timing, laser interferometers, and the CMB: Implications for the early universe  

Science Journals Connector (OSTI)

We derive a general equation relating the gravitational-wave observables r and ?0gw(f); or the observables ?0gw(f1) and ?0gw(f2). Here, r is the so-called “tensor-to-scalar ratio,” which is constrained by cosmic-microwave-background experiments; and ?0gw(f) is the energy spectrum of primordial gravitational waves, which is constrained, e.g., by pulsar-timing measurements, laser-interferometer experiments, and the standard big bang nucleosynthesis bound. Differentiating this equation yields a new expression for the tilt dln??0gw(f)/dln?f of the present-day gravitational-wave spectrum. The relationship between r and ?0gw(f) depends sensitively on the uncertain physics of the early universe, and we show that this uncertainty may be encapsulated (in a model-independent way) by two quantities: w^(f) and n^t(f), where n^t(f) is a certain logarithmic average over nt(k) (the primordial tensor spectral index); and w^(f) is a certain logarithmic average over w˜(a) (the effective equation-of-state parameter in the early universe, after horizon re-entry). Here, the effective equation-of-state parameter w˜(a) is a combination of the ordinary equation-of-state parameter w(a) and the bulk viscosity ?(a). Thus, by comparing observational constraints on r and ?0gw(f), one obtains (remarkably tight) constraints in the {w^(f),n^t(f)} plane. In particular, this is the best way to constrain (or detect) the presence of a stiff energy component (with w>1/3) in the early universe, prior to big bang nucleosynthesis. (The discovery of such a component would be no more surprising than the discovery of a tiny cosmological constant at late times!) Finally, although most of our analysis does not assume inflation, we point out that if cosmic-microwave-background experiments detect a nonzero value for r, then we will immediately obtain (as a free by-product) a new upper bound w^?0.55 on the logarithmically averaged effective equation-of-state parameter during the “primordial dark age” between the end of inflation and the start of big bang nucleosynthesis.

Latham A. Boyle and Alessandra Buonanno

2008-08-18T23:59:59.000Z

242

Quantum Emulation of Gravitational Waves  

E-Print Network (OSTI)

Gravitational waves, as predicted by Einstein's general relativity theory, appear as ripples in the fabric of spacetime traveling at the speed of light. We prove that the propagation of small amplitude gravitational waves in a curved spacetime is equivalent to the propagation of a subspace of electromagnetic states. We use this result to propose the use of entangled photons to emulate the evolution of gravitational waves in curved spacetimes by means of experimental electromagnetic setups featuring metamaterials.

Ivan Fernandez-Corbaton; Mauro Cirio; Alexander Büse; Lucas Lamata; Enrique Solano; Gabriel Molina-Terriza

2014-06-17T23:59:59.000Z

243

PROVOST'S TRAVEL GRANT FOR STUDY  

E-Print Network (OSTI)

Available for Summer 2013 Study Abroad Participants through the NIU Study Abroad Office Williston Hall 417 Office, Williston Hall 417, to be eligible for an award (NO EXCEPTIONS). 1. Study Abroad Travel Grant

Karonis, Nicholas T.

244

PROVOST'S TRAVEL GRANT FOR STUDY  

E-Print Network (OSTI)

Available for Spring 2014 Study Abroad Participants through the NIU Study Abroad Office Williston Hall 417 Office, Williston Hall 417, to be eligible for an award (NO EXCEPTIONS). 1. Study Abroad Travel Grant

Karonis, Nicholas T.

245

PROVOST'S TRAVEL GRANT FOR STUDY  

E-Print Network (OSTI)

Available for Spring 2013 Study Abroad Participants through the NIU Study Abroad Office Williston Hall 417 Office, Williston Hall 417, to be eligible for an award (NO EXCEPTIONS). 1. Study Abroad Travel Grant

Karonis, Nicholas T.

246

PROVOST'S TRAVEL GRANT FOR STUDY  

E-Print Network (OSTI)

the NIU Study Abroad Office Williston Hall 417 815-753-0700 niuabroad@niu.edu APPLICATION DEADLINE: APRIL Office, Williston Hall 417, to be eligible for an award (NO EXCEPTIONS). 1. Study Abroad Travel Grant

Karonis, Nicholas T.

247

Collect Data to Evaluate Greenhouse Gas Emissions Profile for Business Travel  

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

To evaluate a greenhouse gas (GHG) emissions profile, most of the information required to support air travel demand management is currently available through Federal agency-level travel information systems, such as GovTrip. However, that information may not be distributed to programs, regional offices, and sites, which are in the best position to evaluate opportunities to reduce travel. Considerations that may help the agency determine the level at which data should be collected and analyzed include: Where are budgets and policies regarding travel made and modified? What travel approval processes are in place, and who makes the final approval for travel? The data elements defined in Table 1 below will help these decision-makers to better understand travel patterns and track change over time.

248

Time-dependent Ginzburg-Landau equations for mixed d- and s-wave superconductors  

E-Print Network (OSTI)

is the spin carried by an impurity at Ri . U1 and U2 are the non-spin-flip and spin-flip interaction strengths, respectively. By definition, the order parameter in real coordinate and imaginary time space is D ab * ~ xt ,x 8 t!5 V~x2x 8 !F ab... these two functions in terms of the center-of-mass coordinate R5(x1x 8 )/2 and the relative momentum after a Fourier transform with respect to the relative coordinate r5x2x 8 . Thus Eq. ~2.4! can be re- written as D ab * ~ R,k;v!5T ( e E dk...

Zhu, JX; Kim, WK; Ting, CS; Hu, Chia-Ren.

1998-01-01T23:59:59.000Z

249

A Theory of Travel Decision-Making with Applications for Modeling Active Travel Demand  

E-Print Network (OSTI)

A Theory of Travel Decision-Making with Applications for Modeling Active Travel Demand by Patrick interdisciplinary framework for a theory of travel decision-making with applications for travel demand modeling behavior that have a large influence on the development of the theory of travel decision

Bertini, Robert L.

250

Effect of trapped electron on the dust ion acoustic waves in dusty plasma using time fractional modified Korteweg-de Vries equation  

SciTech Connect

The time fractional modified Korteweg-de Vries (TFMKdV) equation is solved to study the nonlinear propagation of small but finite amplitude dust ion-acoustic (DIA) solitary waves in un-magnetized dusty plasma with trapped electrons. The plasma is composed of a cold ion fluid, stationary dust grains, and hot electrons obeying a trapped electron distribution. The TFMKdV equation is derived by using the semi-inverse and Agrawal's methods and then solved by the Laplace Adomian decomposition method. Our results show that the amplitude of the DIA solitary waves increases with the increase of time fractional order ?, the wave velocity v{sub 0}, and the population of the background free electrons ?. However, it is vice-versa for the deviation from isothermality parameter b, which is in agreement with the result obtained previously.

Nazari-Golshan, A. [Department of Physics, Amirkabir University of Technology, Tehran (Iran, Islamic Republic of)] [Department of Physics, Amirkabir University of Technology, Tehran (Iran, Islamic Republic of); Nourazar, S. S. [Department of Physics, Amirkabir University of Technology, Tehran (Iran, Islamic Republic of) [Department of Physics, Amirkabir University of Technology, Tehran (Iran, Islamic Republic of); Department of Mechanical Engineering, Amirkabir University of Technology, Tehran (Iran, Islamic Republic of)

2013-10-15T23:59:59.000Z

251

Analysis of Automobile Travel Demand Elasticities with Respect to Travel Cost  

E-Print Network (OSTI)

Analysis of Automobile Travel Demand Elasticities with Respect to Travel Cost Oak Ridge National relationships between automobile travel demand and cost to analyze the elasticities of the demand for personal

252

The dispersive Alfvn wave in the time-stationary limit with a focus on collisional and warm-plasma effects  

E-Print Network (OSTI)

, the stationary inertial Alfvén StIA wave can accelerate electrons parallel to a background magnetic field properties of the StIA wave may play a role in the formation of discrete auroral arcs. Here, Knudsen's model

California at Los Angles, University of

253

Measuring tides and binary parameters from gravitational wave data and eclipsing timings of detached white dwarf binaries  

E-Print Network (OSTI)

The discovery of the most compact detached white dwarf (WD) binary SDSS J065133.33+284423.3 has been discussed in terms of probing the tidal effects in white dwarfs. This system is also a verification source for the space-based gravitational wave (GW) detector, evolved Laser Interferometer Space Antenna (eLISA) which will observe short-period compact Galactic binaries with $P_{orb}\\lesssim 5$ hrs. We address the prospects of doing tidal studies using eLISA binaries by showing the fractional uncertainties in the orbital decay rate and the rate of that decay, $\\dot{f}, \\ddot{f}$ expected from both the GW and EM data for some of the high-$f$ binaries. We find that $\\dot{f}$ and $\\ddot{f}$ can be measured using GW data only for the most massive WD binaries observed at high-frequencies. Form timing the eclipses for $\\sim 10$ years, we find that $\\dot{f}$ can be known to $\\sim 0.1% $ for J0651. We find that from GW data alone, measuring the effects of tides in binaries is (almost) impossible. We also investigate th...

Shah, Sweta

2014-01-01T23:59:59.000Z

254

A hypersonic plasma bullet train traveling in an atmospheric dielectric-barrier discharge jet  

SciTech Connect

An experimental observation of fast-moving plasma bullets produced in an atmospheric dielectric-barrier discharge jet is reported in this paper. Nanosecond imaging suggests that the atmospheric discharge jet consists of a plasma bullet train traveling at a hypersonic speed from 7.0 km/s to 43.1 km/s. Yet on a millisecond scale, the bullet train appears as a plasma jet of several centimeters long. The plasma bullets are produced through several possible mechanisms, the most likely of which is related to the ionization wave. Time and space resolved optical emission spectroscopy show that reactive plasma species can be delivered to different spatial sites with varying quantities.

Shi Jianjun; Zhong Fangchun; Zhang Jing; Liu, D. W.; Kong, M. G. [College of Science, Donghua University, Shanghai 201620 (China); Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU (United Kingdom)

2008-01-15T23:59:59.000Z

255

Spatiotemporal synchronization of drift waves in a magnetron sputtering plasma  

SciTech Connect

A feedforward scheme is applied for drift waves control in a magnetized magnetron sputtering plasma. A system of driven electrodes collecting electron current in a limited region of the explored plasma is used to interact with unstable drift waves. Drift waves actually appear as electrostatic modes characterized by discrete wavelengths of the order of few centimeters and frequencies of about 100 kHz. The effect of external quasi-periodic, both in time and space, travelling perturbations is studied. Particular emphasis is given to the role played by the phase relation between the natural and the imposed fluctuations. It is observed that it is possible by means of localized electrodes, collecting currents which are negligible with respect to those flowing in the plasma, to transfer energy to one single mode and to reduce that associated to the others. Due to the weakness of the external action, only partial control has been achieved.

Martines, E.; Zuin, M.; Cavazzana, R.; Antoni, V.; Serianni, G.; Spolaore, M.; Vianello, N. [Consorzio RFX, Padova (Italy); Adámek, J. [Institute of Plasma Physics AS CR, Prague (Czech Republic)

2014-10-15T23:59:59.000Z

256

Understanding the differences in the development and use of advanced traveler information systems for vehicles (ATIS/V) in the U.S., Germany, and Japan  

E-Print Network (OSTI)

Traffic congestion is becoming a serious problem. As a solution, advanced traveler information systems (ATIS) mitigate traffic congestion by providing real-time traffic information to travelers. ATIS includes various ...

Sugawara, Yoshihiko

2007-01-01T23:59:59.000Z

257

Greenhouse Gas Mitigation Planning for Business Travel  

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

Business travel is among the largest sources of Scope 3 greenhouse gas (GHG) emissions accounted for by Federal agencies. For some agencies, business travel can represent up to 60% of Scope 3...

258

MECHANICAL ENGINEERING TRAVEL AUTHORIZATION INFORMATION FORM  

E-Print Network (OSTI)

. ______________ Estimated Cost AMOUNT Transportation (Does not include USC vehicle) Subsistence Other Expenses (EXPLAINMECHANICAL ENGINEERING TRAVEL AUTHORIZATION INFORMATION FORM Requested) Estimated Total Cost Account(s) to be charged Dept. Fund Class Analytical Amount** Method of Travel Common

Sutton, Michael

259

Waves and aggregation patterns in myxobacteria Oleg A. Igoshin*, Roy Welch  

E-Print Network (OSTI)

Waves and aggregation patterns in myxobacteria Oleg A. Igoshin*, Roy Welch , Dale Kaiser'' characterized by traveling linear, concentric, and spiral waves. These waves are different from the waves communicate by direct contact. The difference is most dramatic when waves collide: rather than annihilating

Igoshin, Oleg

260

Observation of prolonged coherence time of the collective spin wave of an atomic ensemble in a paraffin-coated {sup 87}Rb vapor cell  

SciTech Connect

We report a prolonged coherence time of the collective spin wave of a thermal {sup 87}Rb atomic ensemble in a paraffin-coated cell. The spin wave is prepared through a stimulated Raman process. The long coherence time is achieved by prolonging the lifetime of the spins with paraffin coating and minimize dephasing with optimal experimental configuration. The observation of the long-time-delayed-stimulated Stokes signal in the writing process suggests the prolonged lifetime of the prepared spins; a direct measurement of the decay of anti-Stokes signal in the reading process shows the coherence time is up to 300 mus after minimizing dephasing. This is 100 times longer than the reported coherence time in the similar experiments in thermal atomic ensembles based on the Duan-Lukin-Cirac-Zoller and its improved protocols. This prolonged coherence time sets the upper limit of the memory time in quantum repeaters based on such protocols, which is crucial for the realization of long-distance quantum communication. The previous reported fluorescence background in the writing process due to collision in a sample cell with buffer gas is also reduced in a cell without buffer gas.

Jiang Shuo; Luo Xiaoming; Chen Liqing; Ning Bo [Physics Department, Tsinghua University, Beijing 100084 (China); Chen Shuai [Physikalisches Institute, Universitaet Heidelberg, 69120 Heidelberg (Germany); Wang Jingyang; Zhong Zhiping [College of Physical Sciences, Graduate University of the Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049 (China); Pan Jianwei [Physics Department, Tsinghua University, Beijing 100084 (China); Physikalisches Institute, Universitaet Heidelberg, 69120 Heidelberg (Germany)

2009-12-15T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Corporate CardsCorporate Cards Travel Card  

E-Print Network (OSTI)

Travel Card Preferred method of payment for University travel Not to be used for purchasing goods and services orNot to be used for purchasing goods and services or personal use ­ Please review the Travel PolicyPurchasing Card Program Preferred method of Purchasing low dollar goods andPreferred method of Purchasing low

Brownstone, Rob

262

GUIDELINES FOR PROFESSIONAL DEVELOPMENT-RELATED TRAVEL, SAEM 1 STUDENT AFFAIRS & ENROLLMENT MANAGEMENT  

E-Print Network (OSTI)

, subsistence, etc. for off-site travel will be as follows: a. Training, education, or development FOR PROFESSIONAL DEVELOPMENT-RELATED TRAVEL, SAEM 2 e. Participation in the off-site event will result in increased or the campus. 4. Release time from work to pursue off-site professional development activities should also

263

Theoretical modeling of propagation of magneto-acoustic waves in magnetic regions below sunspots  

E-Print Network (OSTI)

We use 2D numerical simulations and eikonal approximation to study properties of magneto-acoustic gravity waves traveling below the solar surface through the magnetic structure of sunspots. We consider a series of magnetostatic models of sunspots of different magnetic field strengths, from the deep interior to the chromosphere. The purpose of these studies is to quantify the effect of the magnetic field on local helioseismology measurements. Waves are excited by a sub-photospheric source located in the region beta slightly larger than 1. Time-distance diagrams and travel times are calculated for various frequency intervals and compared to the non-magnetic case. The results confirm that the observed time-distance helioseismology signals in sunspot regions correspond to fast MHD waves. The slow MHD waves form a distinctly different pattern in the time-distance diagram, which has not been detected in observations. The numerical results are in good agreement with the solution in the short-wavelength (eikonal) app...

Khomenko, E; Collados, M; Parchevsky, K; Olshevsky, V

2008-01-01T23:59:59.000Z

264

Gravitational dispersion in a torsional wave machine  

E-Print Network (OSTI)

We demonstrate that mechanical waves traveling in a torsional, mechanical wave machine exhibit dispersion due to gravity and the discreteness of the medium. We also show that although the dispersion due to discreteness is negligible, the dispersion due to gravity can be easily measured, and can be shown to disappear in a zero-gravity environment.

Rafael de la Madrid; Alejandro Gonzalez; George Irwin

2014-09-01T23:59:59.000Z

265

Online traveling salesman problem with deadline and advanced information  

Science Journals Connector (OSTI)

We consider the online version of the traveling salesman problem, where instances are not known in advance. Requests are released over time regardless whether the server is en route or not. This problem has been described as online TSP. Current literature ... Keywords: Advanced information, Competitive ratio, Deadlines, Online routing problems

Xingang Wen; Yinfeng Xu; Huili Zhang

2012-12-01T23:59:59.000Z

266

Unimodal wave trains and solitons in convex FPU chains  

E-Print Network (OSTI)

We consider atomic chains with nearest neighbour interactions and study periodic and homoclinic travelling waves which are called wave trains and solitons, respectively. Our main result is a new existence proof which relies on the constrained maximisation of the potential energy and exploits the invariance properties of an improvement operator. The approach is restricted to convex interaction potentials but refines the standard results as it provides the existence of travelling waves with unimodal and even profile functions. Moreover, we discuss the numerical approximation and complete localization of wave trains, and show that wave trains converge to solitons when the periodicity length tends to infinity.

Michael Herrmann

2009-01-23T23:59:59.000Z

267

Aggregate vehicle travel forecasting model  

SciTech Connect

This report describes a model for forecasting total US highway travel by all vehicle types, and its implementation in the form of a personal computer program. The model comprises a short-run, econometrically-based module for forecasting through the year 2000, as well as a structural, scenario-based longer term module for forecasting through 2030. The short-term module is driven primarily by economic variables. It includes a detailed vehicle stock model and permits the estimation of fuel use as well as vehicle travel. The longer-tenn module depends on demographic factors to a greater extent, but also on trends in key parameters such as vehicle load factors, and the dematerialization of GNP. Both passenger and freight vehicle movements are accounted for in both modules. The model has been implemented as a compiled program in the Fox-Pro database management system operating in the Windows environment.

Greene, D.L.; Chin, Shih-Miao; Gibson, R. [Tennessee Univ., Knoxville, TN (United States)

1995-05-01T23:59:59.000Z

268

May 15, 1993 / Vol. 18, No. 10 / OPTICS LETTERS 781 Extra resonances in time-domain four-wave mixing  

E-Print Network (OSTI)

of optical physics, the basic physics of nonlinear wave mixing (NWM) is replete with subtleties that have not been fully appreciated. For instance, more than a decade passed between the proper treatment-domain extra resonances increase in strength as the pure dephasing rate in- D~~~~~Ei 3 4 5 Frequency(GHz) 0 2 4

Fayer, Michael D.

269

Points of general relativistic shock wave interaction are ‘regularity singularities’ where space–time is not locally flat  

Science Journals Connector (OSTI)

...their analysis is feasible, standard Schwarzschild coordinates (SSCs; a general spherically...regular shock wave interaction in Standard Schwarzschild coordinates In this paper, we restrict...outline the proof of theorem 7.1, which mirrors the constructive proof of Israel's...

2012-01-01T23:59:59.000Z

270

Internal?wave effects on 1000?km oceanic acoustic pulse propagation: Simulation and comparison with experiment  

Science Journals Connector (OSTI)

A recent 1000?km acoustic pulse transmission experiment in the Pacific revealed unexpected fluctuations on received wavefronts including a dominant rapid variation called the broadband fluctuation with time scales less than 10 minutes and spatial scales of less than 60 m; a distinct breakdown of the geometrical optics wavefront pattern and broadening of the wavefront near the transmission finalé; and a coherent wavefront motion with a timescale near the semi?diurnal tidal period. Parabolic?equation numerical simulations have been carried out which utilize environmental data and which take into account internal?wave?induced sound?speed perturbations obeying the Garrett–Munk (GM) spectral model. It is shown that the effects of internal waves can account for the broadband fluctuations the breakdown of the geometrical opticspattern and the wavefront broadening. The sensitivity of these fluctuations to internal?wave energy and modal content is examined. The spectral energy in the GM model at tidal periods proves insufficient to explain the tidal period coherent fluctuations strongly suggesting the influence of an internal tide during the experiment. The simulations allow the estimation of the average travel?time bias caused by internal waves. The simulation results for travel?time wander and bias are compared with analytic calculations based on the path?integral technique.

John A. Colosi; Stanley M. Flatté; Charles Bracher

1994-01-01T23:59:59.000Z

271

Direct observation of a "devil's staircase'' in wave-particle interaction  

E-Print Network (OSTI)

We report the experimental observation of a "devil's staircase'' in a time dependent system considered as a paradigm for the transition to large scale chaos in the universality class of hamiltonian systems. A test electron beam is used to observe its non-self-consistent interaction with externally excited wave(s) in a Travelling Wave Tube (TWT). A trochoidal energy analyzer records the beam energy distribution at the output of the interaction line. An arbitrary waveform generator is used to launch a prescribed spectrum of waves along the slow wave structure (a 4 m long helix) of the TWT. The resonant velocity domain associated to a single wave is observed, as well as the transition to large scale chaos when the resonant domains of two waves and their secondary resonances overlap. This transition exhibits a "devil's staircase'' behavior for increasing excitation amplitude, due to the nonlinear forcing by the second wave on the pendulum-like motion of a charged particle in one electrostatic wave.

Fabrice Doveil; Alessandro Macor; Yves Elskens

2006-04-13T23:59:59.000Z

272

Direct observation of a 'devil's staircase' in wave-particle interaction  

SciTech Connect

We report the experimental observation of a 'devil's staircase' in a time-dependent system considered as a paradigm for the transition to large-scale chaos in the universality class of Hamiltonian systems. A test electron beam is used to observe its non-self-consistent interaction with externally excited wave(s) in a traveling wave tube (TWT). A trochoidal energy analyzer records the beam energy distribution at the output of the interaction line. An arbitrary waveform generator is used to launch a prescribed spectrum of waves along the slow wave structure (a 4 m long helix) of the TWT. The resonant velocity domain associated to a single wave is observed, as well as the transition to large-scale chaos when the resonant domains of two waves and their secondary resonances overlap. This transition exhibits a 'devil's staircase' behavior for increasing excitation amplitude, due to the nonlinear forcing by the second wave on the pendulum-like motion of a charged particle in one electrostatic wave.

Doveil, Fabrice; Macor, Alessandro; Elskens, Yves [Physique des interactions ioniques et moleculaires, Unite 6633 CNRS-Universite de Provence, Equipe turbulence plasma, case 321, Centre de Saint-Jerome, F-13397 Marseille cedex 20 (France)

2006-09-15T23:59:59.000Z

273

Are "EIT Waves" Fast-Mode MHD Waves?  

E-Print Network (OSTI)

We examine the nature of large-scale, coronal, propagating wave fronts (``EIT waves'') and find they are incongruous with solutions using fast-mode MHD plane-wave theory. Specifically, we consider the following properties: non-dispersive single pulse manifestions, observed velocities below the local Alfven speed, and different pulses which travel at any number of constant velocities, rather than at the ``predicted'' fast-mode speed. We discuss the possibility of a soliton-like explanation for these phenomena, and show how it is consistent with the above-mentioned aspects.

M. J. Wills-Davey; C. E. DeForest; J. O. Stenflo

2007-04-23T23:59:59.000Z

274

The Standing Wave on a String as an Oscillator  

Science Journals Connector (OSTI)

In the usual treatment of waves in introductory courses one begins with traveling waves and the frequency/wavelength relationship f??=?v where v is the wave velocity. One then makes the point about superposition and shows that two waves traveling in opposite directions can add up to a standing wave; Eq. (1) still applies. This approach is problematic in two ways: (1) The motion being described standing waves has no apparent “velocity ” and so it seems unnecessarily complex—perhaps unreasonably complex—to construct it out of moving waves; (2) It is not easy to derive the formula for the velocity of waves especially for an audience without calculus or without multi-variate calculus (the wave equation).

Michael Sobel

2007-01-01T23:59:59.000Z

275

Jumping solitary waves in an autonomous reactiondiffusion system with subcritical wave instability  

E-Print Network (OSTI)

Jumping solitary waves in an autonomous reaction­diffusion system with subcritical wave instability as solutions to a reaction­diffusion system with a subcritical short-wavelength instability. We demonstrate systems with a subcritical oscillatory instability.17 Here we present a new type of solitary traveling

Epstein, Irving R.

276

Snakes mimic earthworms: propulsion using rectilinear travelling waves  

Science Journals Connector (OSTI)

...Rectilinear locomotion may also be implemented in the control of medical snake-robots used to reach parts of the human body that physicians...body is pressed against the ground, which prevents the side lighting from reaching the camera. At t = 0 s, the front of the body...

2013-01-01T23:59:59.000Z

277

Traveling-Wave Thermoacoustic Engines With Internal Combustion  

DOE Patents (OSTI)

Thermoacoustic devices are disclosed wherein, for some embodiments, a combustion zone provides heat to a regenerator using a mean flow of compressible fluid. In other embodiments, burning of a combustible mixture within the combustion zone is pulsed in phase with the acoustic pressure oscillations to increase acoustic power output. In an example embodiment, the combustion zone and the regenerator are thermally insulated from other components within the thermoacoustic device.

Weiland, Nathan Thomas (Blacksburg, VA); Zinn, Ben T. (Atlanta, GA); Swift, Gregory William (Sante Fe, NM)

2004-05-11T23:59:59.000Z

278

Negative Diffusion and Traveling Waves in High Dimensional Lattice Systems  

E-Print Network (OSTI)

(x, t)] + f ( u(x, t) ; ? ) , parametrized by ? ? V ? R. The diffusion constant satisfies ? ? 0, the function u takes values in Rn for some n ? 2, the real (n × n)-matrices Aj have nonnegative entries, and the Jacobian D1f(· ; ?) has nonnegative off...-diagonal elements. The shifts r0 < r1 < · · · < rN can be taken to be both positive and negative, i.e., r0 < 0 < rN . We are interested in nonlinearities f that are bistable. In particular, writing 0 = (0, . . . , 0) ? Rn and 1 = (1, . . . , 1) ? Rn, we assume...

Hupkes, H. J.; Van Vleck, Erik S.

2013-01-01T23:59:59.000Z

279

Progress towards of a superconducting traveling wave accelerating structure  

SciTech Connect

In the ILC project the required accelerating gradient is higher than 30 MeV/m. For current technology the maximum acceleration gradient in SC structures is determined mainly by the value of the surface RF magnetic field. In order to increase the gradient, the RF magnetic field is distributed homogeneously over the cavity surface (low-loss structure), and coupling to the beam is improved by introducing aperture 'noses' (reentrant structure). These features allow gradients in excess of 50 MeV/m to be obtained for a singe-cell cavity. Further improvement of the coupling to the beam may be achieved by using a TW SC structure with small phase advance per cell. We have demonstrated that an additional gradient increase by up to 46% may be possible if a {pi}/2 TW SC structure is employed. However, a TW SC structure requires a SC feedback waveguide to return the few GW of circulating RF power from the structure output back to the structure input. The test cavity with the feedback is designed to demonstrate the possibility of achieving a significantly higher gradient than existing SC structures.

Yakovlev, V.; /Yale U.; Avrakhov, P.; Kanareykin, A.; Kazakov, S.; /KEK, Tsukuba; Solyak, N.; /Fermilab

2007-06-01T23:59:59.000Z

280

Young media-induced travelers: online representations of media-induced travel conversations  

E-Print Network (OSTI)

participation and influence in the travel and tourism industry has received moderate attention both conceptually and empirically. Furthermore, despite the increasing availability of travel information online, youths’ predisposition toward media usage...

Scarpino, Michelle Renee

2009-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Validating the Relationship Between Urban Form and Travel Behavior with Vehicle Miles Travelled  

E-Print Network (OSTI)

to the conventional travel impact assessment following the ITE?s (Institute of Transportation Engineers) Trip Generation Handbook, developments with higher levels of urban form measures will generate a greater travel impacts because they generate higher number...

Kakumani, Rajanesh

2010-01-14T23:59:59.000Z

282

Employer Based Travel Demand Management -Devising Options to Meet Employee Travel Needs  

E-Print Network (OSTI)

Employer Based Travel Demand Management - Devising Options to Meet Employee Travel Needs Bruce for presentation at the 2002 Annual Conference of the Canadian Institute of Transportation Engineers to be held May to Meet Employee Travel Needs Bruce Hellinga1 , Charles Lee2 , James Mallett3 , JoAnn Woodhall4 ABSTRACT

Hellinga, Bruce

283

Tube-wave seismic imaging  

DOE Patents (OSTI)

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A [LaFayette, CA

2009-05-05T23:59:59.000Z

284

Tube-wave seismic imaging  

DOE Patents (OSTI)

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A. (Lafayette, CA); Bakulin, Andrey (Houston, TX)

2009-10-13T23:59:59.000Z

285

Non-Motorized Travel Study.pub  

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

Motorized Travel Study: Motorized Travel Study: Identifying Factors that Influence Communities to Walk and Bike and to Examine Why, or Why Not, Travelers Walk and Bike in Their Communities Oak Ridge National Laboratory managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract number DE-AC05-00OR22725 Research Areas Freight Flows Passenger Flows Supply Chain Efficiency Transportation: Energy Environment Safety Security Vehicle Technologies Research Brief T he idea of livable communities suggests that people should have the option to utilize non-motorized travel (NMT), specifically walking and bicycling, to conduct their daily tasks. Forecasting personal travel by walk and bike is necessary as part of regional transportation planning, and requires fine

286

Policy Title: Travel HARVARD UNIVERSITY FINANCIAL POLICY Responsible Office: UFS  

E-Print Network (OSTI)

Policy Title: Travel HARVARD UNIVERSITY FINANCIAL POLICY Responsible Office: UFS Effective Date: July 1, 2010 Revision Date: July 14, 2010TRAVEL Policy Number: TR104 HARVARD UNIVERSITY FINANCIAL POLICY POLICY STATEMENT Harvard University reimburses for necessary and reasonable travel expenses

287

Evaluate Greenhouse Gas Emissions Profile for Business Travel  

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

Developing a Federal agency's business travel greenhouse gas (GHG) emissions profile first involves getting a better understanding of the nature and patterns of travel within the organization. Not all travel can be avoided or effectively substituted with information technology solutions. By understanding where people are traveling by air, the purpose of travel, and what parts of the organization travel most frequently, the agency will be in a better position to develop solutions and program-level targets.

288

Numerical simulation of first-order backscattered P and S waves for time-lapse seismic imaging in heterogeneous reservoirs  

Science Journals Connector (OSTI)

......borehole seismic data aimed at monitoring oil-water substitution in heterogeneous...heterogeneous media, particularly of oil-water substitution events in producing...time-lapse seismometry. Mark Stephenson of Marathon Oil UK kindly supplied the well-core......

P. C. Leary

2002-03-01T23:59:59.000Z

289

Rebound 2007: Analysis of U.S. Light-Duty Vehicle Travel Statistics  

SciTech Connect

U.S. national time series data on vehicle travel by passenger cars and light trucks covering the period 1966 2007 are used to test for the existence, size and stability of the rebound effect for motor vehicle fuel efficiency on vehicle travel. The data show a statistically significant effect of gasoline price on vehicle travel but do not support the existence of a direct impact of fuel efficiency on vehicle travel. Additional tests indicate that fuel price effects have not been constant over time, although the hypothesis of symmetry with respect to price increases and decreases is not rejected. Small and Van Dender (2007) model of a declining rebound effect with income is tested and similar results are obtained.

Greene, David L [ORNL

2010-01-01T23:59:59.000Z

290

Clustering of floaters by waves  

E-Print Network (OSTI)

We study experimentally how waves affect distribution of particles that float on a water surface. We show that clustering of small particles in a standing wave is a nonlinear effect with the clustering time decreasing as the square of the wave amplitude. In a set of random waves, we show that small floaters concentrate on a multi-fractal set.

P. Denissenko; G. Falkovich; S. Lukaschuk

2005-11-22T23:59:59.000Z

291

The flexural wave?number response of a string and a beam subjected to a moving harmonic force  

Science Journals Connector (OSTI)

The effect of a moving harmonic force that acts upon either a string or a beam is analyzed according to its spectral wave?number components and the decaying components of the flexural vibrations. The speed of motion of the force is nondimensionalized with respect to the wave flexural speed. For a string the wave number of the right traveling disturbance increases monotonically at subsonic speeds; at supersonic speeds both wave numbers lead to left traveling waves which decrease as a function of Mach number. For a beam the effect of the motion is to produce one right traveling wave with an everincreasing wave number and three disturbances which propagate and decay behind the forcing function. The decaying modes at a Mach number of two become traveling modes. The critical Mach number of two corresponds to a speed of the force equal to the group velocity at that frequency.

Mauro Pierucci

1993-01-01T23:59:59.000Z

292

ORISE: CDC Travelers' Health Mobile App, Designed by ORISE, Gains...  

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

Can I Eat This? Mobile App Helps International Travelers Make Safe Dining Choices CDC Travelers' Health app, designed by ORISE, gains attention on multiple websites How ORISE is...

293

Better World Club Travel Cool | Open Energy Information  

Open Energy Info (EERE)

responsible travel through partnerships. Company partners commit to promoting ecotourism. References: Better World Club Travel Cool1 This article is a stub. You can help...

294

Solar Decathlon: How far did they travel? | Department of Energy  

Energy Savers (EERE)

Solar Decathlon: How far did they travel? Solar Decathlon: How far did they travel? Toggle Routes onoff Return to map Solar Decathlon Journeys Visualizing the distances that...

295

Identify Strategies to Reduce Business Travel for Greenhouse Gas Mitigation  

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

The tables below illustrate some of the more common strategies that can enable employees to travel less and travel more efficiently for business.

296

A New Table of Observed Travel-Times of Earthquake Waves for Distances of 10° and 180° at One-Degree Intervals Applicable Only to Earthquakes of Shallow Focus  

Science Journals Connector (OSTI)

...excep- tion the fundamental requirement that...interior- wall of boiler-room. This...the buildings safe for operation and providing...amperes for normal operation. A Laon tube...0.1, the fundamental REPORTS AND PAPERS...

J. B. Macelwane; S.J.

297

WebNow login Instructions for Mac Users Accounts Payable & Travel Page 1 of 14  

E-Print Network (OSTI)

WebNow login Instructions for Mac Users Accounts Payable & Travel Version 3 2/12/14 Page 1 of 14 1 on to MyAccess, the system will prompt you to do so. 2) If this is the first time you're logging into Web.ucsf.edu"'. Click on the Allow button. #12;WebNow login Instructions for Mac Users Accounts Payable & Travel Version

Yamamoto, Keith

298

Valuing time and reliability: assessing the evidence from road pricing demonstrations  

E-Print Network (OSTI)

distribution of motorists’ preferences for travel time and reliability:time and reliability as preferences about this distribution.reliability can be fruitfully modeled as a property of the upper tail of the travel-time distribution

Brownstone, David; Small, K A

2005-01-01T23:59:59.000Z

299

General Physics II Exam 2 -Chs. 2022 -Electromagnetism & EM Waves -Mar. 14, 2011 Name Rec. Instr. Rec. Time  

E-Print Network (OSTI)

that is produced by current I2. Label it B2. c) (6) Calculate the net magnetic field strength B produced at point P with time, the induced current is the loop is a. zero. b. clockwise. c. counterclockwise. 12. (3) The north in the wire loop is a. zero. b. clockwise. c. counterclockwise. 13. (3) A wire loop is situated as shown near

Wysin, Gary

300

Cumulative Second Harmonic Generation in Lamb Waves for the Detection of Material Nonlinearities  

SciTech Connect

An understanding of the generation of higher harmonics in Lamb waves is of critical importance for applications such as remaining life prediction of plate-like structural components. The objective of this work is to use nonlinear Lamb waves to experimentally investigate inherent material nonlinearities in aluminum plates. These nonlinearities, e.g. lattice anharmonicities, precipitates or vacancies, cause higher harmonics to form in propagating Lamb waves. The amplitudes of the higher harmonics increase with increasing propagation distance due to the accumulation of nonlinearity while the Lamb wave travels along its path. Special focus is laid on the second harmonic, and a relative nonlinearity parameter is defined as a function of the fundamental and second harmonic amplitude. The experimental setup uses an ultrasonic transducer and a wedge for the Lamb wave generation, and laser interferometry for detection. The experimentally measured Lamb wave signals are processed with a short-time Fourier transformation (STFT), which yields the amplitudes at different frequencies as functions of time, allowing the observation of the nonlinear behavior of the material. The increase of the relative nonlinearity parameter with propagation distance as an indicator of cumulative second harmonic generation is shown in the results for the alloy aluminum 1100-H14.

Bermes, Christian [School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355 (United States); Jacobs, Laurence J. [School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355 (United States); G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405 (United States); Kim, Jin-Yeon; Qu, Jianmin [G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405 (United States)

2007-03-21T23:59:59.000Z

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


301

A precision piezodriven micropositioner mechanism with large travel range  

Science Journals Connector (OSTI)

A micropositioning stage with large travel range has been designed and built. The stage combines a piezoelectric driving element flexure pivoted multiple Scott–Russell linkage and a parallel guiding spring. Quality engineering techniques are used to optimize the configuration of the device in order to achieve the maximum displacement gain and the minimum angular deviation. A simple open-loop compensator is applied to reduce the hysteresis of the dynamic response of the stage. The experiment shows that the stage achieved a vacuum-compatible device with a travel of greater than 100 ?m a resolution of 0.04 ?m and an angular deviation of less than 31.1 ?rad. The first natural frequency of the stage is 80 Hz and the settling time is approximately 50 ms. Compared with the uncontrolled condition the controlled hysteresis is reduced significantly.

S. H. Chang; B. C. Du

1998-01-01T23:59:59.000Z

302

Bending waves due to a moving harmonic force.  

Science Journals Connector (OSTI)

In many structurally induced and flow?induced vibration problems the harmonic forcing function is not stationary but moves with a velocity V 0. The effect of the forcing function velocity V 0 upon the free vibrational wave?number characteristics of a membrane and a plate is analyzed. The Mach numberM is defined to be the ratio of the velocity V 0 to the wave speed of the bending waves. For the membrane the effect of the Mach number is to increase the wave number (shorter wavelength) ahead of the forcing function and to decrease the wave number (longer wavelength) behind it. At supersonic speeds no disturbances travel ahead of the forcing function and both wave numbers lead to trailing waves. These results are equivalent to the classical Doppler?shifted results. The results of the plate are more complex. The right and left traveling waves retain their basic properties with the magnitude of the wave number changing monotomically as a function of the Mach numberM. The near?field decaying disturbances also retain their basic properties but immediately obtain components that induce the decaying disturbances to become left traveling waves with decaying components. At Mach numbers greater than 2 these disturbances become pure waves trailing without any decaying factor. The importance of each of these components as a function of the Mach number is discussed.

Mauro Pierucci

1992-01-01T23:59:59.000Z

303

Time-synchronized continuous wave laser-induced fluorescence axial velocity measurements in a diverging cusped field thruster  

Science Journals Connector (OSTI)

Measurements are presented of time-synchronized axial ion velocities at three positions in the discharge channel and plume of a diverging cusped field thruster operating on xenon. Xenon axial ion velocities for the thruster are derived from laser-induced fluorescence measurements of the 5d[4]7/2–6p[3]5/2 xenon ion excited state transition centred at ? = 834.72 nm. The thruster is operated in a high-current mode, where the anode discharge current is shown to oscillate quasi-periodically. A sample-hold scheme is implemented to correlate ion velocities to phases along the current cycle. These time-synchronized measurements show that median axial ion velocities decrease as discharge current increases, and that the widths of ion velocity distributions increase with increases in discharge current for positions at the exit plane and outside the thruster channel.

N A MacDonald; M A Cappelli; W A Hargus Jr

2014-01-01T23:59:59.000Z

304

Travel Resources | National Nuclear Security Administration  

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

Travel Resources | National Nuclear Security Administration Travel Resources | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog The National Nuclear Security Administration Travel Resources Home > About Us > Our Programs > Defense Programs > Future Science & Technology Programs > Office of Advanced Simulation and Computing and Institutional R&D Programs > Russia Tri-Lab S&T Collaborations > Travel

305

1 Calibration against independent human travel datasets  

E-Print Network (OSTI)

1 Calibration against independent human travel datasets 1.1 Calibration against United States at www.bts.gov. Although the BTS dataset is large, the movements were histogrammed 1 #12;with a low

Shull, Kenneth R.

306

Energy in a String Wave  

Science Journals Connector (OSTI)

When one end of a taut horizontal elastic string is shaken repeatedly up and down a transverse wave (assume sine waveform) will be produced and travel along it.1 College students know this type of wave motion well. They know when the wave passes by each element of the string will perform an oscillating up?down motion which in mechanics is termed simple harmonic 2. They also know elements of the string at the highest and the lowest positions—the crests and the troughs—are momentarily at rest while those at the centerline (zero displacement) have the greatest speed as shown in Fig. 1. Irrespective of this they are less familiar with the energy associated with the wave. They may fail to answer a question such as “In a traveling string wave which elements have respectively the greatest kinetic energy (KE) and the greatest potential energy (PE)?” The answer to the former is not difficult; elements at zero position have the fastest speed and hence their KE being proportional to the square of speed is the greatest. To the PE what immediately comes to their mind may be the simple harmonic motion (SHM) in which the PE is the greatest and the KE is zero at the two turning points. It may thus lead them to think elements at crests or troughs have the greatest PE. Unfortunately this association is wrong. Thinking that the crests or troughs have the greatest PE is a misconception.3

Chiu?king Ng

2010-01-01T23:59:59.000Z

307

Chapter 3. Vehicle-Miles Traveled  

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

3. Vehicle-Miles Traveled 3. Vehicle-Miles Traveled Chapter 3. Vehicle-Miles Traveled Vehicle-miles traveled--the number of miles that residential vehicles are driven--is probably the most important information collected by the Residential Transportation Energy Consumption Survey. Using the data on vehicle-miles traveled allows analysts to answer such questions as: "Are minivans driven more than passenger cars?" "Do people in the West drive more than people elsewhere?" "Do people conserve their new cars by driving them less?" "Who drives more--people in households with children, or other people?" "At what ages do people drive the most?" "How does growing income affect the amount of driving?" In addition to answering those kinds of questions, analysts also use the number of vehicle-miles traveled to compute estimated, on-road vehicle fuel consumption, economy, and expenditures, all of which have important implications for U.S. energy policy and national security (see Chapter 4).

308

Options for reducing CO2 emissions from personal travel in Europe  

Science Journals Connector (OSTI)

Personal travel is an increasingly important aspect of European society. Our demand for travel, in terms of time, money and mobility, is steadily increasing. This growth has led to a number of undesirable effects, including a substantial contribution to global warming through the emission of carbon dioxide (CO2). To address this issue, a number of solutions are available. Already the technology is established for highly economical cars, but experience shows that incentives or regulations are required in order to stimulate widespread interest in saving fuel. Similarly, alternative fuels can offer considerable reductions in greenhouse emissions, depending on the source of the energy. In the longer run, it is essential that technological measures are complemented by policies to reduce the need to travel, whilst still maintaining accessibility. This paper presents a list of policies that are being investigated as part of a strategy for reducing CO2 emissions from personal travel in Britain.

P. Hughes; S . Potter

1992-01-01T23:59:59.000Z

309

Thurston Regional Planning Council Helps Washingtonians Save on Travel Costs  

Office of Energy Efficiency and Renewable Energy (EERE)

Thurston County provides travel information for lower costs, improved safety, and faster response to challenges.

310

Wave-wave interactions in solar type III radio bursts  

SciTech Connect

The high time resolution observations from the STEREO/WAVES experiment show that in type III radio bursts, the Langmuir waves often occur as localized magnetic field aligned coherent wave packets with durations of a few ms and with peak intensities well exceeding the strong turbulence thresholds. Some of these wave packets show spectral signatures of beam-resonant Langmuir waves, down- and up-shifted sidebands, and ion sound waves, with frequencies, wave numbers, and tricoherences satisfying the resonance conditions of the oscillating two stream instability (four wave interaction). The spectra of a few of these wave packets also contain peaks at f{sub pe}, 2f{sub pe} and 3 f{sub pe} (f{sub pe} is the electron plasma frequency), with frequencies, wave numbers and bicoherences (computed using the wavelet based bispectral analysis techniques) satisfying the resonance conditions of three wave interactions: (1) excitation of second harmonic electromagnetic waves as a result of coalescence of two oppositely propagating Langmuir waves, and (2) excitation of third harmonic electromagnetic waves as a result of coalescence of Langmuir waves with second harmonic electromagnetic waves. The implication of these findings is that the strong turbulence processes play major roles in beam stabilization as well as conversion of Langmuir waves into escaping radiation in type III radio bursts.

Thejappa, G. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); MacDowall, R. J. [NASA/Goddard Space Flight Center, Greenbelt MD 20771 (United States)

2014-02-11T23:59:59.000Z

311

Alternative Fuels Data Center: State Employee Travel Policy  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

State Employee Travel State Employee Travel Policy to someone by E-mail Share Alternative Fuels Data Center: State Employee Travel Policy on Facebook Tweet about Alternative Fuels Data Center: State Employee Travel Policy on Twitter Bookmark Alternative Fuels Data Center: State Employee Travel Policy on Google Bookmark Alternative Fuels Data Center: State Employee Travel Policy on Delicious Rank Alternative Fuels Data Center: State Employee Travel Policy on Digg Find More places to share Alternative Fuels Data Center: State Employee Travel Policy on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type State Employee Travel Policy All state agencies and institutions must develop and adopt travel policies that include strategies to reduce petroleum consumption, such as carpooling

312

Identify Strategies to Reduce Business Travel for Greenhouse Gas Mitigation  

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

Strategies to Reduce Business Travel for Greenhouse Gas Strategies to Reduce Business Travel for Greenhouse Gas Mitigation Identify Strategies to Reduce Business Travel for Greenhouse Gas Mitigation October 7, 2013 - 1:34pm Addthis YOU ARE HERE The tables below illustrate some of the more common strategies that can enable employees to travel less and travel more efficiently for business. The "Purpose of Travel" analysis in the previous step can be used with the guidance below to help determine what type of trips may be most appropriately substituted with each business travel alternative. Table 1. Strategies that Enable Employees to Travel Less Business Travel Strategy Best Potential Application Best Practices Web meetings/webinars, including option for video Purpose of travel: training, conferences.

313

Transformative Wave Technologies Kent, Washington  

E-Print Network (OSTI)

Transformative Wave Technologies Kent, Washington www.transformativewave.com #12;#12;North America are shifted to off peak times #12;#12;Transformative Wave Technologies www.transformativewave.com #12

California at Davis, University of

314

Wave energy  

Science Journals Connector (OSTI)

Waves receive their energy from the wind by means of a ... whose yield is not yet clearly understood. Energy in the wave is more concentrated than in the wind ... density. For this reason a motor utilizing wave p...

Ferruccio Mosetti

1982-01-01T23:59:59.000Z

315

Initiation and propagation of combustion waves with competitive reactions and water evaporation  

Science Journals Connector (OSTI)

...Self-sustaining travelling combustion waves are initiated...extent of the process. combustion waves|competitive...water-AN solution and a hydrocarbon fuel, with, in most...a self-propagating combustion wave driven by the overall...e.g. geometry, heat losses, mixture characteristics...

2013-01-01T23:59:59.000Z

316

Dash Waves in a Reaction-Diffusion System Vladimir K. Vanag and Irving R. Epstein  

E-Print Network (OSTI)

Dash Waves in a Reaction-Diffusion System Vladimir K. Vanag and Irving R. Epstein Department of smooth traveling waves or of stationary, discontinuous Turing structures. Hybrid patterns that blend the properties of waves and Turing structures have not previously been observed. We report observation of dash

Epstein, Irving R.

317

2011 Waves -1 STANDING WAVES  

E-Print Network (OSTI)

-multiple of the wavelength: n 2 L ,n 1,2,... . A vibrating string is an example of a transverse wave: its oscillation2011 Waves - 1 STANDING WAVES ON A STRING The objectives of the experiment are: · To show that standing waves can be set up on a string. · To determine the velocity of a standing wave. · To understand

Glashausser, Charles

318

AUTHORIZATION FOR LTI STUDENT TRAVEL Graduate student travel must be approved by the student's advisor prior to making travel arrangements. It is  

E-Print Network (OSTI)

's advisor prior to making travel arrangements. It is generally expected that the student's advisor, or other): __________________________________________________________________ __________________________________________________________________________________________ Advisor Name: _____________________________________________________________________________ Section 2: Advisor Approval I approve of the above student travel and will pay for (check all that apply): Conference

Eskenazi, Maxine

319

CSU Student Travel to Countries with Travel Advisories The U.S. Department of State publishes advisories discouraging travel to countries with  

E-Print Network (OSTI)

advisories discouraging travel to countries with heightened and sometimes uncontrollable risks necessity, duration, specific location, measures taken to mitigate risks, previous travel experience or faculty research grant monies) can only be released once the Office of International Programs (OIP

320

Transferring 2001 National Household Travel Survey  

SciTech Connect

Policy makers rely on transportation statistics, including data on personal travel behavior, to formulate strategic transportation policies, and to improve the safety and efficiency of the U.S. transportation system. Data on personal travel trends are needed to examine the reliability, efficiency, capacity, and flexibility of the Nation's transportation system to meet current demands and to accommodate future demand. These data are also needed to assess the feasibility and efficiency of alternative congestion-mitigating technologies (e.g., high-speed rail, magnetically levitated trains, and intelligent vehicle and highway systems); to evaluate the merits of alternative transportation investment programs; and to assess the energy-use and air-quality impacts of various policies. To address these data needs, the U.S. Department of Transportation (USDOT) initiated an effort in 1969 to collect detailed data on personal travel. The 1969 survey was the first Nationwide Personal Transportation Survey (NPTS). The survey was conducted again in 1977, 1983, 1990, 1995, and 2001. Data on daily travel were collected in 1969, 1977, 1983, 1990 and 1995. In 2001, the survey was renamed the National Household Travel Survey (NHTS) and it collected both daily and long-distance trips. The 2001 survey was sponsored by three USDOT agencies: Federal Highway Administration (FHWA), Bureau of Transportation Statistics (BTS), and National Highway Traffic Safety Administration (NHTSA). The primary objective of the survey was to collect trip-based data on the nature and characteristics of personal travel so that the relationships between the characteristics of personal travel and the demographics of the traveler can be established. Commercial and institutional travel were not part of the survey. Due to the survey's design, data in the NHTS survey series were not recommended for estimating travel statistics for categories smaller than the combination of Census division (e.g., New England, Middle Atlantic, and Pacific), MSA size, and the availability of rail. Extrapolating NHTS data within small geographic areas could risk developing and subsequently using unreliable estimates. For example, if a planning agency in City X of State Y estimates travel rates and other travel characteristics based on survey data collected from NHTS sample households that were located in City X of State Y, then the agency could risk developing and using unreliable estimates for their planning process. Typically, this limitation significantly increases as the size of an area decreases. That said, the NHTS contains a wealth of information that could allow statistical inferences about small geographic areas, with a pre-determined level of statistical certainty. The question then becomes whether a method can be developed that integrates the NHTS data and other data to estimate key travel characteristics for small geographic areas such as Census tract and transportation analysis zone, and whether this method can outperform other, competing methods.

Hu, Patricia S [ORNL; Reuscher, Tim [ORNL; Schmoyer, Richard L [ORNL; Chin, Shih-Miao [ORNL

2007-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Convectively unstable wave packets in spatially developing open flows and media with algebraically decaying tails  

Science Journals Connector (OSTI)

...first recognized in the plasma physics literature (see Twiss 1951...absolute and convective. In Handbook of plasma physics (ed. M. N. Rosenbluth & R...Stability of traveling waves. In Handbook of dynamical systems II (ed...

2005-01-01T23:59:59.000Z

322

Greenhouse Gas Mitigation Planning for Business Travel | Department of  

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

Business Travel Business Travel Greenhouse Gas Mitigation Planning for Business Travel October 7, 2013 - 1:20pm Addthis Business travel is among the largest sources of Scope 3 greenhouse gas (GHG) emissions accounted for by Federal agencies. For some agencies, business travel can represent up to 60% of Scope 3 emissions, but represents about 20% of Scope 3 emissions for the Federal sector as whole. While other emissions categories have been the focus of efficiency improvements for several years, few agencies have been actively planning to manage business travel for GHG reduction purposes. Travel management due to budgetary constraints has typically been more common for Federal agencies in the past. Because air travel emissions are the biggest source of travel emissions for most agencies, this guidance focuses on planning for

323

Road less traveled vital to operational success  

SciTech Connect

PNNL's Monthly Economic Diversity column for the Tri-City Herald Business section. Excerpt follows: Things aren't always what they seem. Sometimes the path less traveled--although it can be exhausting if not scary to think about navigating its unknowns--really is the best way to go. And not just because Robert Frost said so. Patric Sazama, Regional Project Director for Impact Washington, would agree as well. He recently spoke to the Three Rivers Entrepreneur Network about achieving operational success by addressing the less tangible elements of an organization, the company's own less traveled path.

Madison, Alison L.

2012-01-08T23:59:59.000Z

324

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

Science Journals Connector (OSTI)

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

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

2010-01-01T23:59:59.000Z

325

5. Water waves 5.1. Travelling waves on deep water (2D)  

E-Print Network (OSTI)

-resolution sounders, Appl. Opt, 41, 2002 Harnisch and Eisenhauer, Natural CF4 and SF6 on Earth, Geophys. Res. Lett., 25,1998 Harnisch et al, CF4 and the age of mesospheric and polar vortex air, Geophys. Res. Lett., 26-term stratospheric carbon tetrafluoride (CF4) increase inferred from 1985-2004 infrared space-based solar occultation

Read, Peter L.

326

Solitary shock waves and other travelling waves in a general compressible hyperelastic rod  

Science Journals Connector (OSTI)

...this case, the lowest-order dispersive term is equal to zero. By going to the next order, we nd the dispersive term is " c2u , which will be the same order as the nonlinear terms (O(")), if = O(1). In other words, the length-scale should...

2000-01-01T23:59:59.000Z

327

The Time Dependent Traveling Salesman Problem: Polyhedra and ...  

E-Print Network (OSTI)

inequalities can be expressed in terms of the TDTSP variables as follows: ? j?S x0 ... at a vertex in S or it must enter S no later than layer n ? |S|. ..... The search.

2010-12-30T23:59:59.000Z

328

Semantics of time travel in a generative information space  

E-Print Network (OSTI)

to Java by a framework named ecologylab.xml, which was developed as a part of this thesis. These computational keyframe semantics serve as the basis for interaction semantics. A user study was conducted in the form of a design competition, to evaluate...

Khandelwal, Madhur Jugalkishore

2005-02-17T23:59:59.000Z

329

Explosive plane-wave lens  

DOE Patents (OSTI)

An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive. 4 figs.

Marsh, S.P.

1988-03-08T23:59:59.000Z

330

Explosive plane-wave lens  

DOE Patents (OSTI)

An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive. 3 figs., 3 tabs.

Marsh, S.P.

1987-03-12T23:59:59.000Z

331

Explosive plane-wave lens  

DOE Patents (OSTI)

An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive.

Marsh, Stanley P. (Los Alamos, NM)

1988-01-01T23:59:59.000Z

332

Employment centers and travel behavior: exploring the work commute of Mumbai’s rapidly motorizing middle class  

Science Journals Connector (OSTI)

Abstract In the Greater Mumbai Region (GMR), jobs and housing are agglomerating in nodes in the periphery of Mumbai City. However, current transportation investments focus on strengthening connections within Mumbai City, while these outlying nodes have received less attention. As housing and jobs move out, given limited travel choices, the need for mobility nudges many middle class Indian households into owning private vehicles. Using household travel survey data from the GMR, this paper develops an understanding of how worker’s trips are different for those who commute to the city versus the exurbs. Socio-economic and transportation indicators for middle class workers going to the city versus the exurbs show that these populations are quite similar demographically. However, those traveling to the exurbs, on average, tend to be at a socio-economic disadvantage with respect to income, education and out-of-pocket travel burdens. Those traveling to exurban work locations have shorter travel times and trip distances, and make much higher use of walking, biking, rickshaws, and motorized two-wheelers compared to commuters to Mumbai City. Across the GMR, car users travel longer and farther compared to motorized two-wheeler users. On average, traveling by a private vehicle is faster than bus or rickshaw travel revealing advantages of private vehicle use. These mode choices in the middle class have resulted in rapid motorization and negative externalities such as traffic congestion and emissions. Evidence of large increases in motorized two-wheelers and cars in India suggests that these modes will likely keep growing, unless competing efficient travel options are supplied.

Manish Shirgaokar

2014-01-01T23:59:59.000Z

333

Travel Information 1 Symposium and Workshop location  

E-Print Network (OSTI)

/From IAD Washington Dulles International Airport (IAD) is 26 miles (41 km) from downtown Washington away. 2 Travel from local airports There are three local airports: IAD (Washington Dulles), BWI the metro to your hotel (see http://www.airwise.com/airports/us/dulles/by bus.html). For more information

Warnow,Tandy

334

Janelia Conference Travel Policy Updated January 2013  

E-Print Network (OSTI)

airport to Janelia Farm is Washington Dulles (IAD). The following represents maximum reimbursement based ......................................................$1,750 · Middle East/Far East/Africa/Australia .......$2,500 Use of a taxi from Dulles Airport. Business-class is reimbursable on a case-by-case basis for international travelers. The most convenient

Eddy, Sean

335

The Machine Learning and Traveling Repairman Problem  

E-Print Network (OSTI)

The goal of the Machine Learning and Traveling Repairman Problem (ML&TRP) is to determine a route for a “repair crew,” which repairs nodes on a graph. The repair crew aims to minimize the cost of failures at the nodes, but ...

Tulabandhula, Theja

336

G-PASS: Security Infrastructure for Grid Travelers  

Science Journals Connector (OSTI)

Grid travelers are special mobile processes responsible for ... virtual organizations (VOs). We propose a security infrastructure called G-PASS to provide security support for grid travelers during their trip and...

Tianchi Ma; Lin Chen; Cho-Li Wang…

2004-01-01T23:59:59.000Z

337

Epidemiology of Travel to the Developing World from Connecticut, USA  

Science Journals Connector (OSTI)

International travel has become a major pursuit of modern Americans, with visits to the developing world frequently included on their itineraries. It is estimated that more than 8 million Americans travel to t...

D. R. Hill

1989-01-01T23:59:59.000Z

338

Carbon-friendly travel plan construction using an evolutionary algorithm  

Science Journals Connector (OSTI)

This paper discusses the use of an evolutionary algorithm to design workplace travel plans, to promote of car sharing and reduce carbon emissions from single-occupancy motor vehicles. Keywords: carbon-trading, emissions-trading, travel plan

Neil B. Urquhart

2007-07-01T23:59:59.000Z

339

Alternative Fuels Data Center: Vehicle Miles Traveled Tax Feasibility  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Vehicle Miles Traveled Vehicle Miles Traveled Tax Feasibility Evaluation to someone by E-mail Share Alternative Fuels Data Center: Vehicle Miles Traveled Tax Feasibility Evaluation on Facebook Tweet about Alternative Fuels Data Center: Vehicle Miles Traveled Tax Feasibility Evaluation on Twitter Bookmark Alternative Fuels Data Center: Vehicle Miles Traveled Tax Feasibility Evaluation on Google Bookmark Alternative Fuels Data Center: Vehicle Miles Traveled Tax Feasibility Evaluation on Delicious Rank Alternative Fuels Data Center: Vehicle Miles Traveled Tax Feasibility Evaluation on Digg Find More places to share Alternative Fuels Data Center: Vehicle Miles Traveled Tax Feasibility Evaluation on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type

340

Forecasting 65+ travel : an integration of cohort analysis and travel demand modeling  

E-Print Network (OSTI)

Over the next 30 years, the Boomers will double the 65+ population in the United States and comprise a new generation of older Americans. This study forecasts the aging Boomers' travel. Previous efforts to forecast 65+ ...

Bush, Sarah, 1973-

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Periodic gravitational waves from small cosmic string loops  

Science Journals Connector (OSTI)

We consider a population of small, high-velocity cosmic string loops. We assume the typical length of these loops is determined by the gravitational radiation scale and use the results of Polchinski and Rocha which pointed out their highly relativistic nature. A study of the gravitational wave emission from such a population is carried out. The large Lorentz boost involved causes the lowest harmonics of the loops to fall within the frequency band of the Laser Interferometer Gravitational Wave Observatory detector. Because of this feature the gravitational waves emitted by such loops can be detected in a periodic search rather than in burst or stochastic analysis. It is shown that, for interesting values of the string tension (10-10?G??10-8), the detector can observe loops at reasonably high redshifts and that detection is, in principle, possible. We compute the number of expected observations produced by such a process. For a 10 h search we find that this number is of order O(10-4). This is a consequence of the low effective number density of the loops traveling along the line of sight. However, small probabilities of reconnection and longer observation times can improve the result.

Florian Dubath and Jorge V. Rocha

2007-07-02T23:59:59.000Z

342

Acoustic normal mode fluctuation statistics in the 1995 SWARM internal wave scattering experiment  

Science Journals Connector (OSTI)

In order to understand the fluctuations imposed upon low frequency (50 to 500 Hz) acoustic signals due to coastal internal waves a large multilaboratory multidisciplinary experiment was performed in the Mid-Atlantic Bight in the summer of 1995. This experiment featured the most complete set of environmental measurements (especially physical oceanography and geology) made to date in support of a coastal acoustics study. This support enabled the correlation of acoustic fluctuations to clearly observed ocean processes especially those associated with the internal wave field. More specifically a 16 element WHOI vertical line array (WVLA) was moored in 70 m of water off the New Jersey coast. Tomography sources of 224 Hz and 400 Hz were moored 32 km directly shoreward of this array such that an acoustic path was constructed that was anti-parallel to the primary onshore propagation direction for shelf generated internal wavesolitons. These nonlinear internal waves produced in packets as the tide shifts from ebb to flood produce strong semidiurnal effects on the acoustic signals at our measurement location. Specifically the internal waves in the acoustic waveguide cause significant coupling of energy between the propagating acoustic modes resulting in broadband fluctuations in modal intensity travel-time and temporal coherence. The strong correlations between the environmental parameters and the internal wave field include an interesting sensitivity of the spread of an acoustic pulse to solitons near the receiver.

Robert H. Headrick; James F. Lynch; John N. Kemp; Arthur E. Newhall; Keith von der Heydt; John Apel; Mohsen Badiey; Ching-sang Chiu; Steve Finette; Marshall Orr; Bruce Pasewark; Alton Turgot; Steve Wolf; Dirk Tielbuerger

2000-01-01T23:59:59.000Z

343

Microsoft Word - Student Travel Request Form.docx  

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

neup@inl.gov | Fax: (208) 526-8076 | Phone: (208) 526-1336 neup@inl.gov | Fax: (208) 526-8076 | Phone: (208) 526-1336 FELLOWSHIP TRAVEL REQUEST FORM Student Name: _____________________________ Date of Request: _________________________ University: ________________________________ Email Address: ___________________________ Phone: ___________________________________ In-State Travel Out-of-State Travel Event Name: ___________________________________________________________________________ Destination: ___________________________________________________________________________ Justification: ___________________________________________________________________________ *Presentation/Poster Title: _______________________________________________________________ Departure Date: _________________________ Return Date: _________________________

344

Irrigation of Liquid Manures with a Traveling Gun  

E-Print Network (OSTI)

Irrigation of Liquid Manures with a Traveling Gun Albert R. Jarrett, Professor, Agricultural Extension This fact sheet emphasizing how to check a traveling gun liquid manure system for appropriate the information in this fact sheet. A traveling gun is a sprinkler containing a large (>0.5-inch diameter) nozzle

Kaye, Jason P.

345

Updated 9/13/12 1 Faculty Research Travel Grant  

E-Print Network (OSTI)

Updated 9/13/12 1 Faculty Research Travel Grant Application Guidelines The Colorado State University Office of International Programs (OIP) is pleased to offer a grant program to support travel and Instructions for Application Criteria 1. Faculty Research Travel Grants support new research activities

346

E-Print Network 3.0 - a-priori traveling salesman Sample Search...  

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

the Probabilistic Traveling Summary: for the Probabilistic Traveling Salesman Problem Mauro Birattari Prasanna Balaprakash Thomas Stutzle Marco Dorigo... competitive. 1...

347

Telecommunications and travel demand and supply: Aggregate structural equation models for the US  

E-Print Network (OSTI)

a technology assessment of telecommunication- transportationRelationships between Telecommunications and Travel:forthcoming) Does telecommunications affect passenger travel

Choo, Sangho; Mokhtarian, Patricia L

2007-01-01T23:59:59.000Z

348

Mechanical Surface Waves Accompany Action Potential Propagation  

E-Print Network (OSTI)

Many studies have shown that a mechanical displacement of the axonal membrane accompanies the electrical pulse defining the Action Potential (AP). Despite a large and diverse body of experimental evidence, there is no theoretical consensus either for the physical basis of this mechanical wave nor its interdependence with the electrical signal. In this manuscript we present a model for these mechanical displacements as arising from the driving of surface wave modes in which potential energy is stored in elastic properties of the neuronal membrane and cytoskeleton while kinetic energy is carried by the axoplasmic fluid. In our model these surface waves are driven by the traveling wave of electrical depolarization that characterizes the AP, altering the compressive electrostatic forces across the membrane as it passes. This driving leads to co-propagating mechanical displacements, which we term Action Waves (AWs). Our model for these AWs allows us to predict, in terms of elastic constants, axon radius and axoplasmic density and viscosity, the shape of the AW that should accompany any traveling wave of voltage, including the AP predicted by the Hodgkin and Huxley (HH) equations. We show that our model makes predictions that are in agreement with results in experimental systems including the garfish olfactory nerve and the squid giant axon. We expect our model to serve as a framework for understanding the physical origins and possible functional roles of these AWs in neurobiology.

Ahmed El Hady; Benjamin B. Machta

2014-07-28T23:59:59.000Z

349

Travel and tourism: Into a complex network  

E-Print Network (OSTI)

It is discussed how the worldwide tourist arrivals, about 10% of world's domestic product, form a largely heterogeneous and directed complex network. Remarkably the random network of connectivity is converted into a scale-free network of intensities. The importance of weights on network connections is brought into discussion. It is also shown how strategic positioning particularly benefit from market diversity and that interactions among countries prevail on a technological and economic pattern, questioning the backbones of traveling driving forces.

Miguens, J I L

2008-01-01T23:59:59.000Z

350

DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas  

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

DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas Emissions DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas Emissions June 29, 2012 - 12:19pm Addthis Judy McLemore from the Waste Isolation Pilot Plant led efforts to reduce the DOE’s vehicle fleet by 20 percent, improving sustainability and saving money. Under her leadership, greenhouse gas emissions associated with business travel were reduced by 63 percent and travel costs were reduced by greater than 60 percent. Judy McLemore from the Waste Isolation Pilot Plant led efforts to reduce the DOE's vehicle fleet by 20 percent, improving sustainability and saving money. Under her leadership, greenhouse gas emissions associated with business travel were reduced by 63 percent and travel costs were

351

Assess Potential Changes in Business Travel that Impact Greenhouse Gas  

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

Changes in Business Travel that Impact Greenhouse Changes in Business Travel that Impact Greenhouse Gas Emissions Assess Potential Changes in Business Travel that Impact Greenhouse Gas Emissions October 7, 2013 - 1:22pm Addthis YOU ARE HERE Step 1 For a Federal agency, changes in the demand for business travel can be difficult to predict. Changes in the nature of the agency's work may have a substantial impact on the demand for business travel. It is therefore important to account for these changes when planning for greenhouse gas (GHG) emissions reduction. Conditions that may contribute to a significant increase or decrease in the agency's business travel, beyond specific efforts to reduce business travel demand, include: Significant changes in the agency's budget Addition or completion of major program activities that require

352

Prioritize Greenhouse Gas Mitigation Strategies for Business Travel |  

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

Business Travel Business Travel Prioritize Greenhouse Gas Mitigation Strategies for Business Travel October 7, 2013 - 1:38pm Addthis YOU ARE HERE Based on the guidance in steps 3 in evaluating strategies and step 4 in estimating the cost of implementing those strategies, the agency can define a program of communications, policy and management, and technological and infrastructure support activities that it believes are necessary to support travel reductions. Because business travel can be such a challenging areas to address, effective travel reduction programs will ensure that all of these elements are in place to enable the desired outcomes. Prioritization of those business travel management strategies will instead focus on how broadly the program can be deployed across the agency. The

353

DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas  

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

DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas Emissions DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas Emissions June 29, 2012 - 12:19pm Addthis Judy McLemore from the Waste Isolation Pilot Plant led efforts to reduce the DOE’s vehicle fleet by 20 percent, improving sustainability and saving money. Under her leadership, greenhouse gas emissions associated with business travel were reduced by 63 percent and travel costs were reduced by greater than 60 percent. Judy McLemore from the Waste Isolation Pilot Plant led efforts to reduce the DOE's vehicle fleet by 20 percent, improving sustainability and saving money. Under her leadership, greenhouse gas emissions associated with business travel were reduced by 63 percent and travel costs were

354

Extension arm for mobile travelers suit case  

DOE Patents (OSTI)

The invention is an apparatus for adjusting a luggage handle in relation to a luggage frame utilized to transport luggage by a traveler. The handle is connected to two extendable and retractable slide tube assemblies, the assemblies allow for the telescoping of the luggage handle to multiple positions in relation to a pair of fixed frame tubes connected to a luggage shell with wheels, to accommodate the height and personal stride of traveler. The luggage handle incorporates triggering buttons that allow ambidextrous and single-handed control of the height of the handle and slide tube assembly in relation to the luggage. The handle and slide tube assembly are connected by interior filaments to pulleys and filaments within two concentric light-weight slide tubes, which are inserted respectively into two fixed frame tubes, to allow a multitude of positions for the slide tubes to lock into the fixed frame tubes. The apparatus can be pushed or pulled by the traveler, and the support shell can accommodate multiple pieces of luggage.

Byington, Gerald A. (Knoxville, TN)

1999-01-01T23:59:59.000Z

355

Interaction for solitary waves in coasting charged particle beams  

SciTech Connect

By using the extended Poincare-Lighthill-Kuo perturbation method, the collision of solitary waves in a coasting charged particle beams is studied. The results show that the system admits a solution with two solitary waves, which move in opposite directions and can be described by two Korteweg-deVries equation in small-amplitude limit. The collision of two solitary waves is elastic, and after the interaction they preserve their original properties. Then the weak phase shift in traveling direction of collision between two solitary waves is derived explicitly.

Liu, Shi-Wei; Hong, Xue-Ren; Shi, Yu-Ren; Duan, Wen-shan, E-mail: duanws@nwnu.edu.cn [College of Physics and Electronic Engineering and Joint Laboratory of Atomic an Molecular Physics of NWNU and IMPCAS, Northwest Normal University, Lanzhou 730070 (China)] [College of Physics and Electronic Engineering and Joint Laboratory of Atomic an Molecular Physics of NWNU and IMPCAS, Northwest Normal University, Lanzhou 730070 (China); Qi, Xin; Yang, Lei, E-mail: lyang@impcas.ac.cn [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)] [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Han, Jiu-Ning [College of Physics and Electromechanical Engineering, Hexi University, Zhangye 734000 (China)] [College of Physics and Electromechanical Engineering, Hexi University, Zhangye 734000 (China)

2014-03-15T23:59:59.000Z

356

Stochastic simulation for the propagation of high-frequency acoustic waves through a random velocity field  

SciTech Connect

In-service inspection of Sodium-Cooled Fast Reactors (SFR) requires the development of non-destructive techniques adapted to the harsh environment conditions and the examination complexity. From past experiences, ultrasonic techniques are considered as suitable candidates. The ultrasonic telemetry is a technique used to constantly insure the safe functioning of reactor inner components by determining their exact position: it consists in measuring the time of flight of the ultrasonic response obtained after propagation of a pulse emitted by a transducer and its interaction with the targets. While in-service the sodium flow creates turbulences that lead to temperature inhomogeneities, which translates into ultrasonic velocity inhomogeneities. These velocity variations could directly impact the accuracy of the target locating by introducing time of flight variations. A stochastic simulation model has been developed to calculate the propagation of ultrasonic waves in such an inhomogeneous medium. Using this approach, the travel time is randomly generated by a stochastic process whose inputs are the statistical moments of travel times known analytically. The stochastic model predicts beam deviations due to velocity inhomogeneities, which are similar to those provided by a determinist method, such as the ray method.

Lu, B.; Darmon, M.; Leymarie, N.; Chatillon, S.; Potel, C. [CEA, LIST, F-91191 Gif-sur-Yvette (France); Laboratoire d'Acoustique de l'Universite du Maine (LAUM), UMR CNRS 6613, 72085 Le Mans Cedex 9 (France)

2012-05-17T23:59:59.000Z

357

Three-dimensional P and S waves velocity structures of the Coso...  

Open Energy Info (EERE)

structures of the Coso geothermal area, California, from microseismic travel time data Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article:...

358

Standing waves in the Universe  

E-Print Network (OSTI)

At first, a review of our knowledge on the distribution of galaxies at large-scale, leading to a foam-like large-scale structure of the Universe, is presented in the Introduction. Then, it is shown how, according to the present theory for the formation of superclusters, wave scalar perturbations of the same frequency traveling in opposite directions give rise to standing waves, which cause a motion of the cosmic material towards the nodes, resulting in the concentration of the cosmic material around the nodes. Generalizing this effect to two (three) dimensions, the cosmic material is concentrated around the node lines (node surfaces). It is proposed that the three-dimensional effect is responsible for the foam-like large-scale structure of the Universe.

Evangelos Chaliasos

2005-12-06T23:59:59.000Z

359

PROPAGATION OF SEISMIC WAVES THROUGH A SPATIO-TEMPORALLY FLUCTUATING MEDIUM: HOMOGENIZATION  

SciTech Connect

Measurements of seismic wave travel times at the photosphere of the Sun have enabled inferences of its interior structure and dynamics. In interpreting these measurements, the simplifying assumption that waves propagate through a temporally stationary medium is almost universally invoked. However, the Sun is in a constant state of evolution, on a broad range of spatio-temporal scales. At the zero-wavelength limit, i.e., when the wavelength is much shorter than the scale over which the medium varies, the WKBJ (ray) approximation may be applied. Here, we address the other asymptotic end of the spectrum, the infinite-wavelength limit, using the technique of homogenization. We apply homogenization to scenarios where waves are propagating through rapidly varying media (spatially and temporally), and derive effective models for the media. One consequence is that a scalar sound speed becomes a tensorial wave speed in the effective model and anisotropies can be induced depending on the nature of the perturbation. The second term in this asymptotic two-scale expansion, the so-called corrector, contains contributions due to higher-order scattering, leading to the decoherence of the wave field. This decoherence may be causally linked to the observed wave attenuation in the Sun. Although the examples we consider here consist of periodic arrays of perturbations to the background, homogenization may be extended to ergodic and stationary random media. This method may have broad implications for the manner in which we interpret seismic measurements in the Sun and for modeling the effects of granulation on the scattering of waves and distortion of normal-mode eigenfunctions.

Hanasoge, Shravan M. [Department of Geosciences, Princeton University, Princeton, NJ 08544 (United States); Gizon, Laurent [Max-Planck-Institut fuer Sonnensystemforschung, D-37191 Katlenburg-Lindau (Germany); Bal, Guillaume [Department of Applied and Physical Mathematics, Columbia University, New York, NY 10027 (United States)

2013-08-20T23:59:59.000Z

360

wave energy  

Science Journals Connector (OSTI)

wave energy ? Wellenenergie f [Die einer Schwerewelle innewohnende potentielle und kinetische Energie. Sie ist etwa proportional dem Quadrat der Wellenhöhe. Zeichen: E we ...

2014-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Gravitational wave astronomy and cosmology  

E-Print Network (OSTI)

The first direct observation of gravitational waves' action upon matter has recently been reported by the BICEP2 experiment. Advanced ground-based gravitational-wave detectors are being installed. They will soon be commissioned, and then begin searches for high-frequency gravitational waves at a sensitivity level that is widely expected to reach events involving compact objects like stellar mass black holes and neutron stars. Pulsar timing arrays continue to improve the bounds on gravitational waves at nanohertz frequencies, and may detect a signal on roughly the same timescale as ground-based detectors. The science case for space-based interferometers targeting millihertz sources is very strong. The decade of gravitational-wave discovery is poised to begin. In this writeup of a talk given at the 2013 TAUP conference, we will briefly review the physics of gravitational waves and gravitational-wave detectors, and then discuss the promise of these measurements for making cosmological measurements in the near future.

Scott A. Hughes

2014-05-02T23:59:59.000Z

362

Foreign Travel Health & Wellness Information | Department of Energy  

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

Wellness Programs » Foreign Travel Health Wellness Programs » Foreign Travel Health & Wellness Information Foreign Travel Health & Wellness Information All travelers should take the following precautions, no matter the destination: Wash hands often with soap and water. Because motor vehicle crashes are a leading cause of injury among travelers, walk and drive defensively; avoid travel at night if possible and always use seat belts. Don't eat or drink dairy products unless you know they have been pasteurized. Never eat undercooked ground beef and poultry, raw eggs, and unpasteurized dairy products; raw shellfish is particularly dangerous to persons who have liver disease or compromised immune systems. Don't eat food purchased from street vendors; do not drink beverages with ice. Don't handle animals, including dogs and cats, to avoid bites and

363

ADMF-007 EOTA Pre-Travel Authorization 11_0221  

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

7 EOTA Pre-Travel Authorization 11_0221 7 EOTA Pre-Travel Authorization 11_0221 11_0221 Deleted extraneous redundant areas and updated chart. EOTA - Business Form Document Title: EOTA Pre-Travel Authorization Form Document Number: ADMF-007 Rev. 11_0221 Document Owner: Approvers: Elizabeth Sousa Melissa Otero Backup Owner: Melissa Otero Referenced Documents: N/A Parent Document: Notify of Changes: ADMP-004, Travel Process ADM MGT 08_0314 Changed name to EOTA Pre-Travel..., added area to identify if a detailed trip report is required, moved FMT signature block. 08_0523 Changed form to mirror the Prime Contractor form as all information is necessary for all authorized travel. Revision History: Rev. Description of Change A Initial Release. 11_0105 Added a refundable/non-refundable approval 08_0606 Added Company Name to form. Merged cells to reveal required text for Yes/No approval.

364

Evaluate Greenhouse Gas Reduction Strategies for Business Travel  

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

For reducing greenhouse gas emissions (GHG), this section provides guidance to Federal agencies on what strategies are typically available, when they are usually applicable, and best practices for supporting deployment. To reduce travel-related emissions, agencies can either conduct business using a means besides travel (i.e. travel less), or travel more efficiently by, for example, combining multiple objectives/trips into one. While these two options appear straightforward, reducing business travel emissions can be a difficult topic to approach with employees. A top-down travel management approach can have near-term benefits in terms of cost-savings and GHG reduction but may have unintended consequences when cuts are made across the board and will not likely be sustained by behavior change if budgets are later increased.

365

Gator: A hybrid spectral/PIC formulation of the interaction of electron beams with slow-wave structures  

SciTech Connect

A time-dependent nonlinear analysis of a helix traveling wave tube is presented for a beam propagating through a sheath helix surrounded by a conducting wall. The effects of dielectric- and vane-loading are included as is the tapering of the helix pitch. Dielectric-loading is described when the gap between the helix and the wall is uniformly filled. Vane-loading describes the insertion of vanes running the length of the helix. The field is represented as a superposition of azimuthally symmetric waves in vacuo. An overall explicit sinusoidal variation is assumed, and the polarization and radial variation of each wave is determined by the boundary conditions in a vacuum circuit. The propagation of each wave as well as the interaction with the beam is included by allowing the amplitudes of the waves to vary in z and t. A dynamical equation is derived analogously to Poynting's equation, and solved in conjunction with the 3-D Lorentz force equations. The model is compared with linear theory.

Freund, H. P.; Zaidman, E. G. [Science Applications International Corp., McLean, Virginia 22102 (United States); Naval Research Laboratory, Washington, Distict of Columbia 20375 (United States)

1997-02-01T23:59:59.000Z

366

Gator: A hybrid spectral/PIC formulation of the interaction of electron beams with slow-wave structures  

Science Journals Connector (OSTI)

A time-dependent nonlinear analysis of a helix traveling wave tube is presented for a beam propagating through a sheath helix surrounded by a conducting wall. The effects of dielectric- and vane-loading are included as is the tapering of the helix pitch. Dielectric-loading is described when the gap between the helix and the wall is uniformly filled. Vane-loading describes the insertion of vanes running the length of the helix. The field is represented as a superposition of azimuthally symmetric waves in vacuo. An overall explicit sinusoidal variation is assumed and the polarization and radial variation of each wave is determined by the boundary conditions in a vacuum circuit. The propagation of each wave as well as the interaction with the beam is included by allowing the amplitudes of the waves to vary in z and t. A dynamical equation is derived analogously to Poynting’s equation and solved in conjunction with the 3-D Lorentz force equations. The model is compared with linear theory.

H. P. Freund; E. G. Zaidman

1997-01-01T23:59:59.000Z

367

Gator: A hybrid spectral/PIC formulation of the interaction of electron beams with slow-wave structures  

SciTech Connect

A time-dependent nonlinear analysis of a helix traveling wave tube is presented for a beam propagating through a sheath helix surrounded by a conducting wall. The effects of dielectric- and vane-loading are included as is the tapering of the helix pitch. Dielectric-loading is described when the gap between the helix and the wall is uniformly filled. Vane-loading describes the insertion of vanes running the length of the helix. The field is represented as a superposition of azimuthally symmetric waves {ital in vacuo}. An overall explicit sinusoidal variation is assumed, and the polarization and radial variation of each wave is determined by the boundary conditions in a vacuum circuit. The propagation of each wave as well as the interaction with the beam is included by allowing the amplitudes of the waves to vary in z and t. A dynamical equation is derived analogously to Poynting{close_quote}s equation, and solved in conjunction with the 3-D Lorentz force equations. The model is compared with linear theory. {copyright} {ital 1997 American Institute of Physics.}

Freund, H.P. [Science Applications International Corp., McLean, Virginia 22102 (United States); Zaidman, E.G. [Naval Research Laboratory, Washington, Distict of Columbia 20375 (United States)

1997-02-01T23:59:59.000Z

368

Equatorial Solitary Waves. Part 2: Envelope Solitons  

Science Journals Connector (OSTI)

Via the method of multiple scales, it is shown that the time and space evolution of the envelope of wave packets of weakly nonlinear, strongly dispersive equatorial waves is governed by the Nonlinear Schrödinger equation. The diverse phenomena of ...

John P. Boyd

1983-03-01T23:59:59.000Z

369

Vacuum Waves  

E-Print Network (OSTI)

As an example of the unification of gravitation and particle physics, an exact solution of the five-dimensional field equations is studied which describes waves in the classical Einstein vacuum. While the solution is essentially 5D in nature, the waves exist in ordinary 3D space, and may provide a way to test for an extra dimension.

Paul S. Wesson

2012-12-11T23:59:59.000Z

370

Petroleum Reduction Strategies to Reduce Vehicle Miles Traveled  

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

For reducing greenhouse gas emissions, the table below describes petroleum reduction strategies to reduce vehicle miles traveled, as well as guidance and best practices for each strategy.

371

Do Telecommunications Affect Passenger Travel or Vica Versa?  

E-Print Network (OSTI)

3. Mokhtarian, P. L. Telecommunications and Travel: The Caseand S. Marvin. Telecommunications and the City: Electronicand B. Wellenius. Telecommunications & Economic Development,

Choo, Sangho; Mokhtarian, Patricia L

2006-01-01T23:59:59.000Z

372

Going Mental: Everyday Travel and the Cognitive Map  

E-Print Network (OSTI)

and Tommy Gärling. 2004. “Cognitive Maps and Urban Travel,”Technologies and the Cognitive Walking Experience,” WalkingForthcoming. Regardless, cognitive mapping and spatial

Mondschein, Andrew; Blumenberg, Evelyn; Taylor, Brian D.

2013-01-01T23:59:59.000Z

373

PIA - Foreign Travel Management System (FTMS) | Department of...  

Office of Environmental Management (EM)

(FTMS) PIA - Foreign Travel Management System (FTMS) More Documents & Publications PIA - INL PeopleSoft - Human Resource System PIA - INL SECURITY INFORMATION MANAGEMENT SYSTEM...

374

Energy Secretary Bodman Travels to Moscow, Baku, Kiev to Discuss...  

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

WASHINGTON, DC -- Secretary of Energy Samuel Bodman next week will travel to Moscow, Russia; Baku, Azerbaijan; and Kiev, Ukraine, where he will hold discussions with senior...

375

Secretary Bodman To Travel to Vienna, Austria for Second GNEP...  

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

on Sunday, September 16, 2007, with partner countries: China, France, Japan, and Russia. Secretary Bodman To Travel to Vienna, Austria for Second GNEP Ministerial and IAEA...

376

Travel Policy for Contractor Personnel | The Ames Laboratory  

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

Travel Policy for Contractor Personnel Version Number: 3 Document Number: Policy 48300.005 Effective Date: 022013 File (public): Policy48300.005rev3.pdf...

377

Brain teasers traveling exhibit opens at Los Alamos National...  

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

Brain teasers exhibit opens at museum Brain Teasers traveling exhibit opens at Los Alamos National Laboratory's Bradbury Science Museum The interactive exhibit is a collection of...

378

Fact #842: October 13, 2014 Vehicles and Vehicle Travel Trends...  

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

drivers, number of vehicles in operation, and total vehicle miles traveled. Fact 842 Dataset Supporting Information Population and Vehicle Growth Comparison, 1950-2012 Year...

379

Revision Date: 02.10.2009 MATERIAL & DISBURSEMENT SERVICES, TRAVEL SERVICES  

E-Print Network (OSTI)

Revision Date: 02.10.2009 MATERIAL & DISBURSEMENT SERVICES, TRAVEL SERVICES Web Travel Purpose: The web travel system is an electronic solution for departments to submit for approval and generate, and Travel Reimbursements. Web travel is also used in conjunction with the Central Airfare Billing System

Crews, Stephen

380

NO FLARES FROM GAMMA-RAY BURST AFTERGLOW BLAST WAVES ENCOUNTERING SUDDEN CIRCUMBURST DENSITY CHANGE  

SciTech Connect

Afterglows of gamma-ray bursts are observed to produce light curves with the flux following power-law evolution in time. However, recent observations reveal bright flares at times on the order of minutes to days. One proposed explanation for these flares is the interaction of a relativistic blast wave with a circumburst density transition. In this paper, we model this type of interaction computationally in one and two dimensions, using a relativistic hydrodynamics code with adaptive mesh refinement called RAM, and analytically in one dimension. We simulate a blast wave traveling in a stellar wind environment that encounters a sudden change in density, followed by a homogeneous medium, and compute the observed radiation using a synchrotron model. We show that flares are not observable for an encounter with a sudden density increase, such as a wind termination shock, nor for an encounter with a sudden density decrease. Furthermore, by extending our analysis to two dimensions, we are able to resolve the spreading, collimation, and edge effects of the blast wave as it encounters the change in circumburst medium. In all cases considered in this paper, we find that a flare will not be observed for any of the density changes studied.

Gat, Ilana; Van Eerten, Hendrik; MacFadyen, Andrew [Center for Cosmology and Particle Physics, Physics Department, New York University, New York, NY 10003 (United States)

2013-08-10T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

THE IMPACTS OF TELECOMMUNICATIONS TECHNOLOGIES ON NONWORK TRAVEL BEHAVIOR  

E-Print Network (OSTI)

THE IMPACTS OF TELECOMMUNICATIONS TECHNOLOGIES ON NONWORK TRAVEL BEHAVIOR by Susan L. Handy and Tom Potential new telecommunications technologies and services could have dramatic impacts on travel behavior otherwise involved a trip. But telecommunications technologies may lead to other types of impacts as well

Handy, Susan L.

382

OFFICE OF ACADEMIC AFFAIRS Doctoral Student Travel Program  

E-Print Network (OSTI)

of these awards will be expected to adhere to the Higher Education Travel Rule. If two or more students plan different papers, posters, etc., those students will be expected to share expenses and the award $1000. All requests must comply with the Higher Education Travel Rule. Award Procedures The department

Mohaghegh, Shahab

383

An investigation of induced travel at mixed-use developments  

E-Print Network (OSTI)

are replacing trips on the external street network. In this investigation, travel survey data were analyzed to determine the nature and extent of induced travel at mixed-use developments. The study site was a 75-acre suburban infill mixed-use development...

Sperry, Benjamin Robert

2009-05-15T23:59:59.000Z

384

Supply Chain Management Purchasing, Direct Pay and Travel  

E-Print Network (OSTI)

CBA section can be purchased with a CBA. Signatures Required for Travel (Dean's office policySupply Chain Management Purchasing, Direct Pay and Travel Purchasing ­ all purchases made by the University are governed by policy Note: Four uses of State General Funds are always prohibited: the purchase

385

RESIDENTIAL LOCATION CHOICE AND TRAVEL BEHAVIOR: IMPLICATIONS FOR AIR QUALITY  

E-Print Network (OSTI)

RESIDENTIAL LOCATION CHOICE AND TRAVEL BEHAVIOR: IMPLICATIONS FOR AIR QUALITY UC Davis-Caltrans Air Avenue Davis, CA 95616 Prepared for The California Department of Transportation Mike Brady, Air Quality control measure. #12;RESIDENTIAL LOCATION CHOICE AND TRAVEL BEHAVIOR: IMPLICATIONS FOR AIR QUALITY

Levinson, David M.

386

Coherence waves  

Science Journals Connector (OSTI)

In 1955 Wolf noticed that the mutual coherence function ? obeys two wave equations [Proc. R. Soc. London230, 246 (1955)]. The physical optics of this finding is thoroughly presented in...

Lohmann, Adolf W; Mendlovic, David; Shabtay, Gal

1999-01-01T23:59:59.000Z

387

University Of Aberdeen Sustainable Travel Plan 2013_2017 V1 0.Docx Page 1 of 18 University of Aberdeen Sustainable Travel Plan  

E-Print Network (OSTI)

. The development of a sustainable travel plan is a significant element in the fulfilment of our commitmentUniversity Of Aberdeen Sustainable Travel Plan 2013_2017 V1 0.Docx Page 1 of 18 University of Aberdeen Sustainable Travel Plan 2013-2017 Author: Christopher Osbeck, Travel Plan Co-ordinator Current

Levi, Ran

388

University Statement on Carbon Offsetting for Travel July 2011 Travel contributes significantly to the emissions of the University. We all have a role to play in  

E-Print Network (OSTI)

to the emissions of the University. We all have a role to play in reducing our own and the organisations carbonUniversity Statement on Carbon Offsetting for Travel July 2011 Travel contributes significantly footprint: reducing our travel emissions by travelling less or by choosing more sustainable modes should

Haase, Markus

389

Electron Climbing a 'Devil's Staircase' in Wave-Particle Interaction  

SciTech Connect

Numerous nonlinear driven systems display spectacular responses to forcing, including chaos and complex phase-locking plateaus characterized by 'devil's staircase', Arnold tongues, and Farey trees. In the universality class of Hamiltonian systems, a paradigm is the motion of a charged particle in two waves, which inspired a renormalization group method for its description. Here we report the observation of the underlying 'devil's staircase' by recording the beam velocity distribution function at the outlet of a traveling wave tube versus the amplitude of two externally induced waves.

Macor, Alessandro; Doveil, Fabrice; Elskens, Yves [Physique des interactions ioniques et moleculaires, Unite 6633 CNRS-Universite de Provence, Equipe turbulence plasma, case 321, Centre de Saint-Jerome, F-13397 Marseille cedex 20 (France)

2005-12-31T23:59:59.000Z

390

Checklist for Medical Issues When Traveling Overseas | Department of Energy  

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

Benefits » Wellness Programs » Foreign Travel Health Benefits » Wellness Programs » Foreign Travel Health & Wellness Information » Checklist for Medical Issues When Traveling Overseas Checklist for Medical Issues When Traveling Overseas Before the Trip A written confirmation from an appropriate manager, i.e., a Travel Authorization or memorandum, that identifies the employee and country(ies) that will be visited should be provided the medical support staff 4-8 weeks prior to the trip or, if less than 4 weeks, as soon as management or the employee becomes aware of it. The medical staff will identify what vaccinations are recommended for each country and discuss the current health issues for each country with the employee. Some vaccinations take several weeks to become effective. The medical staff will review and update the employee's routine

391

WebNow login Instructions for PC Users Accounts Payable & Travel Page 1 of 15  

E-Print Network (OSTI)

WebNow login Instructions for PC Users Accounts Payable & Travel Version 3 2/12/14 Page 1 of 15 1 into MyAccess, the system will prompt you to log in. 2) If this is the first time you're logging into WebNow, you will be asked to RUN an application to do an initial setup of the WebNow applet on your computer

Yamamoto, Keith

392

Wave represents displacement Wave represents pressure Source -Sound Waves  

E-Print Network (OSTI)

Wave represents displacement Wave represents pressure Source - Sound Waves Distance between crests is wavelength Number of crests passing a point in 1 second is frequency Wave represents pressure Target - Radio Waves Distance between crests is wavelength Number of crests passing a point in 1 second is frequency

Colorado at Boulder, University of

393

THE EFFECTS OF WAVE ESCAPE ON FAST MAGNETOSONIC WAVE TURBULENCE IN SOLAR FLARES  

SciTech Connect

One of the leading models for electron acceleration in solar flares is stochastic acceleration by weakly turbulent fast magnetosonic waves ({sup f}ast waves{sup )}. In this model, large-scale flows triggered by magnetic reconnection excite large-wavelength fast waves, and fast-wave energy then cascades from large wavelengths to small wavelengths. Electron acceleration by large-wavelength fast waves is weak, and so the model relies on the small-wavelength waves produced by the turbulent cascade. In order for the model to work, the energy cascade time for large-wavelength fast waves must be shorter than the time required for the waves to propagate out of the solar-flare acceleration region. To investigate the effects of wave escape, we solve the wave kinetic equation for fast waves in weak turbulence theory, supplemented with a homogeneous wave-loss term. We find that the amplitude of large-wavelength fast waves must exceed a minimum threshold in order for a significant fraction of the wave energy to cascade to small wavelengths before the waves leave the acceleration region. We evaluate this threshold as a function of the dominant wavelength of the fast waves that are initially excited by reconnection outflows.

Pongkitiwanichakul, Peera; Chandran, Benjamin D. G. [Space Science Center and Department of Physics, University of New Hampshire, Durham, NH 03824 (United States); Karpen, Judith T. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); DeVore, C. Richard, E-mail: pbu3@unh.edu, E-mail: benjamin.chandran@unh.edu, E-mail: judy.karpen@nasa.gov, E-mail: devore@nrl.navy.mil [Naval Research Laboratory, Washington, DC 20375 (United States)

2012-09-20T23:59:59.000Z

394

Telecommunications and travel demand and supply: Aggregate structural equation models for the US  

E-Print Network (OSTI)

relationships between telecommunications and travel:S. , Marvin, S. , 1996. Telecommunications and the City:assessment of telecommunication-transportation interactions.

Choo, Sangho; Mokhtarian, Patricia L

2008-01-01T23:59:59.000Z

395

E-Print Network 3.0 - automobile travel Sample Search Results  

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

Search Powered by Explorit Topic List Advanced Search Sample search results for: automobile travel Page: << < 1 2 3 4 5 > >> 1 APPLICATION FOR A GRADUATE STUDENT TRAVEL GRANT...

396

E-Print Network 3.0 - advanced traveler information systems Sample...  

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

by Explorit Topic List Advanced Search Sample search results for: advanced traveler information systems Page: << < 1 2 3 4 5 > >> 1 Page 1 of 2 Travel Advance Requirements...

397

Methodological Issues in the Estimation of the Travel, Energy, and Air Quality Impacts of Telecommuting  

E-Print Network (OSTI)

have analyzed the air quality and energy impacts, but mostits travel, air quality, and energy impacts, and illustrateTHE TRAVEL, ENERGY, AND AIR QUALITY IMPACTS OF TELECOMMUTING

Mokhtarian, Patricia; Handy, Susan; Salomon, Ilan

1995-01-01T23:59:59.000Z

398

Consumer Responses to Stereotypical vs. Non-Stereotypical Depictions of Women in Travel Advertising.  

E-Print Network (OSTI)

??Women are active travel consumers, yet travel advertising notoriously depicts women stereotypically. If consumers react negatively to these stereotypical portrayals in advertising, they may disregard… (more)

McDonald, Jessica Eran

2010-01-01T23:59:59.000Z

399

Trav Info Evaluation (Technology Element ) Traveler Information Center (TIC) Study: System Reliability and Communications Interface  

E-Print Network (OSTI)

Traveler Information Center (TIC) Study (September 1996 -Information Center (TIC) Study (Technology EvaluationTraveler Information Center (TIC) Study: System Reliability

Miller, Mark; Loukakos, Dimitri

1998-01-01T23:59:59.000Z

400

Estimate Costs to Implement Greenhouse Gas Mitigation Strategies for Business Travel  

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

Once business travel reduction strategies have been identified, a Federal agency may evaluate the cost of implementing those measures and any potential savings from avoided travel.

Note: This page contains sample records for the topic "wave travel time" 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

E-Print Network 3.0 - air travel restrictions Sample Search Results  

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

- Department of Physics, Boston College Collection: Physics ; Materials Science 5 International Travel Checklist Compliance with Laws Summary: for your air travel, are you in...

402

E-Print Network 3.0 - activity-based travel demand Sample Search...  

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

Approach to Household Travel Choice by Kara... Fall 1998 12;A Utility-Theory-Consistent System-of-Demand-Equations Approach to Household Travel... the...

403

Pepsico Research Travel Fellowships for Russia, Eurasia, and East-Central Europe  

E-Print Network (OSTI)

Pepsico Research Travel Fellowships for Russia, Eurasia, and East-Central Europe Pepsi travel to Russia, Eurasia, and East-Central Europe, for the purposes of conducting research

Qian, Ning

404

Emergence of exponentially small reflected waves  

E-Print Network (OSTI)

We study the time-dependent scattering of a quantum mechanical wave packet at a barrier for energies larger than the barrier height, in the semi-classical regime. More precisely, we are interested in the leading order of the exponentially small scattered part of the wave packet in the semiclassical parameter when the energy density of the incident wave is sharply peaked around some value. We prove that this reflected part has, to leading order, a Gaussian shape centered on the classical trajectory for all times soon after its birth time. We give explicit formulas and rigorous error bounds for the reflected wave for all of these times.

Volker Betz; Alain Joye; Stefan Teufel

2008-04-23T23:59:59.000Z

405

Rogue waves for a long wave-short wave resonance model with multiple short waves  

E-Print Network (OSTI)

1 Rogue waves for a long wave-short wave resonance model with multiple short waves Hiu Ning Chan (1 waves; Long-short resonance PACS Classification: 02.30.Jr; 05.45.Yv; 47.35.Fg #12;2 ABSTRACT A resonance between long and short waves will occur if the phase velocity of the long wave matches the group velocity

406

Electromagnetic wave scattering by Schwarzschild black holes  

E-Print Network (OSTI)

We analyze the scattering of a planar monochromatic electromagnetic wave incident upon a Schwarzschild black hole. We obtain accurate numerical results from the partial wave method for the electromagnetic scattering cross section, and show that they are in excellent agreement with analytical approximations. The scattering of electromagnetic waves is compared with the scattering of scalar, spinor and gravitational waves. We present a unified picture of the scattering of all massless fields for the first time.

Luís C. B. Crispino; Sam R. Dolan; Ednilton S. Oliveira

2009-05-20T23:59:59.000Z

407

Fiber optic sensor employing successively destroyed coupled points or reflectors for detecting shock wave speed and damage location  

DOE Patents (OSTI)

A shock velocity and damage location sensor providing a means of measuring shock speed and damage location. The sensor consists of a long series of time-of-arrival "points" constructed with fiber optics. The fiber optic sensor apparatus measures shock velocity as the fiber sensor is progressively crushed as a shock wave proceeds in a direction along the fiber. The light received by a receiving means changes as time-of-arrival points are destroyed as the sensor is disturbed by the shock. The sensor may comprise a transmitting fiber bent into a series of loops and fused to a receiving fiber at various places, time-of-arrival points, along the receiving fibers length. At the "points" of contact, where a portion of the light leaves the transmitting fiber and enters the receiving fiber, the loops would be required to allow the light to travel backwards through the receiving fiber toward a receiving means. The sensor may also comprise a single optical fiber wherein the time-of-arrival points are comprised of reflection planes distributed along the fibers length. In this configuration, as the shock front proceeds along the fiber it destroys one reflector after another. The output received by a receiving means from this sensor may be a series of downward steps produced as the shock wave destroys one time-of-arrival point after another, or a nonsequential pattern of steps in the event time-of-arrival points are destroyed at any point along the sensor.

Weiss, Jonathan D. (Albuquerque, NM)

1995-01-01T23:59:59.000Z

408

Generalized Debye series expansion to improve the non-destructive testing and health monitoring of cylindrical structures by guided waves  

Science Journals Connector (OSTI)

Many structures in civil engineering notably bridges and nuclear power plants must be regularly strictly and carefully tested to avoid any human or environmental catastrophe. Among the NDT techniques which can be applied ultrasonic guided waves are a good candidate to monitor bars and cables. However its multimodal and dispersive behaviors can limit its performances. Theoretical modeling is sometimes needed to understand the behavior of the traveling waves to improve the testing/monitoring and made a right in-situ decision. The aim of this paper is to derive the space-time velocity field in a cylindrical waveguide perfectly embedded in an infinite solid matrix and generated by an inside bounded beam. This beam is generated by an off-axis source. Vector Hankel transform and Fourier series are combined to decompose the inside field into infinity of elementary cylindrical waves propagating in radial direction and planar waves propagating in axial direction. Global resolution method and Generalized Debye series expansion are used both to calculate the 3D global cylindrical reflection/transmission coefficients. The method is demonstrated through a steel bar embedded in cement matrix. Simulated frequency–wavenumber diagrams show that the embedding material acts like filter for different frequency ranges. Other results will be presented.

Nico F. Declercq

2013-01-01T23:59:59.000Z

409

Derivation of site-specific relationships between hydraulic parameters and p-wave velocities based on hydraulic and seismic tomography  

SciTech Connect

In this study, hydraulic and seismic tomographic measurements were used to derive a site-specific relationship between the geophysical parameter p-wave velocity and the hydraulic parameters, diffusivity and specific storage. Our field study includes diffusivity tomograms derived from hydraulic travel time tomography, specific storage tomograms, derived from hydraulic attenuation tomography, and p-wave velocity tomograms, derived from seismic tomography. The tomographic inversion was performed in all three cases with the SIRT (Simultaneous Iterative Reconstruction Technique) algorithm, using a ray tracing technique with curved trajectories. The experimental set-up was designed such that the p-wave velocity tomogram overlaps the hydraulic tomograms by half. The experiments were performed at a wellcharacterized sand and gravel aquifer, located in the Leine River valley near Göttingen, Germany. Access to the shallow subsurface was provided by direct-push technology. The high spatial resolution of hydraulic and seismic tomography was exploited to derive representative site-specific relationships between the hydraulic and geophysical parameters, based on the area where geophysical and hydraulic tests were performed. The transformation of the p-wave velocities into hydraulic properties was undertaken using a k-means cluster analysis. Results demonstrate that the combination of hydraulic and geophysical tomographic data is a promising approach to improve hydrogeophysical site characterization.

Brauchler, R.; Doetsch, J.; Dietrich, P.; Sauter, M.

2012-01-10T23:59:59.000Z

410

Vortices in Brain waves  

E-Print Network (OSTI)

2003). Vortices in Brain Waves 62. M. E. Raichle, ScienceVORTICES IN BRAIN WAVES WALTER J. FREEMAN Department ofthat is recorded in brain waves (electroencephalogram, EEG).

Freeman, Walter J III; Vitiello, Giuseppe

2010-01-01T23:59:59.000Z

411

MHK Technologies/Seatricity wave energy converter | Open Energy Information  

Open Energy Info (EERE)

Seatricity wave energy converter Seatricity wave energy converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Seatricity wave energy converter.jpg Technology Profile Primary Organization Seatricity Project(s) where this technology is utilized *MHK Projects/Seatricity Antigua *MHK Projects/Seatricity Orkney Technology Resource Click here Wave Technology Type Click here Attenuator Technology Readiness Level Click here TRL 7/8: Open Water System Testing & Demonstration & Operation Technology Description In the simplest terms, a float travels up and down with the waves and operates a pump to pressurise sea water which is piped ashore. Many individual pumps are connected together to produce substantial amounts of pressurized water. Once ashore the pressurized sea water is used to drive a standard hydroelectric turbine to produce electricity.

412

Study of cavity type antenna structure of large-area 915 MHz ultra-high frequency wave plasma device based on three-dimensional finite difference time-domain analysis  

SciTech Connect

A large-area planar plasma source with a resonant cavity type launcher driven by a 915 MHz ultra-high frequency wave was developed. Theoretical analysis with the three-dimensional finite difference time-domain simulation was carried out to determine the optimized launcher structure by analyzing the resonant transverse magnetic mode in the resonant cavity. Numerical result expects that the resonant electric field distribution inside the cavity dominantly consists of the TM{sub 410} mode. The resonant cavity type launcher having 8 holes in an octagonal geometry was designed to fit the resonant transverse magnetic mode. Adjusting 8 hole positions of the launcher to the field pattern of the resonant TM{sub 410} mode, we found that the plasma density increased about 40%?50% from 1.0?1.1 × 10{sup 11} cm{sup ?3} to ?1.5 × 10{sup 11} cm{sup ?3} at the same incident power of 2.5 kW, compared with the previous results with the launcher having 6 holes in the hexagonal geometry. It is also noted that the electron density changes almost linearly with the incident wave power without any mode jumps.

Chang, Xijiang [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China) [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China); Graduate School of Science and Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561 (Japan); Kunii, Kazuki [Graduate School of Engineering, Shizuoka University,3-5-1 Johoku, Hamamatsu 432-8561 (Japan)] [Graduate School of Engineering, Shizuoka University,3-5-1 Johoku, Hamamatsu 432-8561 (Japan); Liang, Rongqing [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China)] [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China); Nagatsu, Masaaki [Graduate School of Science and Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561 (Japan) [Graduate School of Science and Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561 (Japan); Graduate School of Engineering, Shizuoka University,3-5-1 Johoku, Hamamatsu 432-8561 (Japan)

2013-11-14T23:59:59.000Z

413

Researchers test novel power system for space travel  

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

Power system for space travel Power system for space travel Researchers test novel power system for space travel The research team recently demonstrated the first use of a heat pipe to cool a small nuclear reactor and power a Stirling engine. November 26, 2012 John Bounds of Los Alamos National Laboratory's Advanced Nuclear Technology Division makes final adjustments on the DUFF experiment, a demonstration of a simple, robust fission reactor prototype that could be used as a power system for space travel. DUFF is the first demonstration of a space nuclear reactor system to produce electricity in the United States since 1965. John Bounds of Los Alamos National Laboratory's Advanced Nuclear Technology Division makes final adjustments on the DUFF experiment, a demonstration of a simple, robust fission reactor prototype that could be used as a power

414

Deputy Secretary Poneman to Travel to Russia | Department of Energy  

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

Poneman to Travel to Russia Poneman to Travel to Russia Deputy Secretary Poneman to Travel to Russia December 3, 2010 - 12:00am Addthis Washington, D.C. - On Monday, December 6, U.S. Deputy Secretary of Energy Daniel Poneman will travel to Russia as part of the ongoing cooperation between the two countries on nuclear security and peaceful nuclear energy issues. On Tuesday, Deputy Secretary Poneman will co-chair the U.S.-Russia Nuclear Energy and Nuclear Security Working Group Plenary Meeting with Director General of the State Atomic Energy Corporation "Rosatom" Sergei Kiriyenko. The Working Group was established under the U.S.-Russia Bilateral Presidential Commission at the July 2009 Presidential Summit. Last fall, Director Kiriyenko visited the United States for the first meetings of the

415

Novel power system demonstrated for space travel | National Nuclear  

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

Novel power system demonstrated for space travel | National Nuclear Novel power system demonstrated for space travel | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > Novel power system demonstrated for space travel Novel power system demonstrated for space travel Posted By Office of Public Affairs John Bounds, Los Alamos National Laboratory

416

Sec. Chu Travels to Houston | Department of Energy  

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

Sec. Chu Travels to Houston Sec. Chu Travels to Houston Sec. Chu Travels to Houston February 2, 2012 - 5:19pm Addthis The Houston Medical Center Thermal Energy Corporation Control Room. | Photo Courtesy of the Texas Medical Center The Houston Medical Center Thermal Energy Corporation Control Room. | Photo Courtesy of the Texas Medical Center Ginny Simmons Ginny Simmons Former Managing Editor for Energy.gov, Office of Public Affairs Secretary Chu traveled to Houston, Texas, today to meet with executives from various oil and gas companies, host a State of the Union Town Hall with students from Houston Community College, and tour the Texas Medical Center -- which recently completed a series of major energy efficiency upgrades. As part of his blueprint to build an economy to last, President Obama has

417

Novel power system demonstrated for space travel | National Nuclear  

National Nuclear Security Administration (NNSA)

Novel power system demonstrated for space travel | National Nuclear Novel power system demonstrated for space travel | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > Novel power system demonstrated for space travel Novel power system demonstrated for space travel Posted By Office of Public Affairs John Bounds, Los Alamos National Laboratory

418

DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas  

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

WIPP Representative for Cutting Travel Costs, Greenhouse WIPP Representative for Cutting Travel Costs, Greenhouse Gas Emissions DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse Gas Emissions June 1, 2012 - 12:00pm Addthis Secretary Chu presents the Secretary of Energy's Appreciation Award to Judy A. McLemore. Secretary Chu presents the Secretary of Energy's Appreciation Award to Judy A. McLemore. WASHINGTON, D.C. - A representative of the Waste Isolation Pilot Plant (WIPP) near Carlsbad, N.M., on Tuesday received the Secretary of Energy's Appreciation Award for her efforts to improve sustainability and reduce travel costs and the number of fleet vehicles. Judy A. McLemore, who works for URS Regulatory and Environmental Services, based in Carlsbad, was honored for helping advance DOE's management and

419

Travelling in Towns is Necessary but not Impossible  

Science Journals Connector (OSTI)

... peak travel hours by offering employers who ask their people to work eccentric hours a rebate on local taxes-one of the most obvious diseconomies of the present balance between private ...

1973-01-26T23:59:59.000Z

420

Odometer Versus Self-Reported Estimates of Vehicle Miles Traveled  

Reports and Publications (EIA)

The findings described here compare odometer readings with self-reported estimates of Vehicle Miles Traveled (VMT) to investigate to what extent self-reported VMT is a reliable surrogate for odometer-based VMT.

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Mission Travelers: Relationship-building and Crosscultural Adaptation  

E-Print Network (OSTI)

to interact with local residents. They want to communicate with local residents in the host community and build a relationship with them. Therefore, for STM travelers their relationship with local residnets really matters. Many tourism scholars have argued...

Lee, Yoon Jung

2012-10-19T23:59:59.000Z

422

Why People Travel? Examining Perceived Benefits of Tourism  

E-Print Network (OSTI)

. Thus, the primary purpose of this research was to examine the effects of perceived tourism benefits on travel behavior based on the model of attitude importance. Since existing scales of tourism benefits failed to incorporate some important items...

Chen, Chun-Chu

2012-11-14T23:59:59.000Z

423

Online traveling salesman problem with deadlines and service flexibility  

Science Journals Connector (OSTI)

Considering the customer psychology while waiting to be served, we introduce a more reasonable form of deadlines into online traveling salesman problem (OL-TSP) with service flexibility. The salesman can choos...

Xingang Wen; Yinfeng Xu; Huili Zhang

2013-08-01T23:59:59.000Z

424

Understanding transit travel behavior : value added by smart cards  

E-Print Network (OSTI)

Travel behavior represents a particularly complex area of research in transportation given the interaction between transport supply characteristics and the user perceptions which guide his/her decisions. Thanks to the ...

Gupta, Saumya, S.M. Massachusetts Institute of Technology

2006-01-01T23:59:59.000Z

425

U.S. Department of Energy Travel Manual  

Directives, Delegations, and Requirements

To supplement information contained in the Federal Travel Regulation (FTR) by providing further clarification and establishing Department of Energy (DOE) policy on matters that the FTR left to Agency discretion. Canceled by DOE M 552.1-1A.

2002-09-04T23:59:59.000Z

426

U.S. Department of Energy Travel Manual  

Directives, Delegations, and Requirements

The Manual supplements information in the Federal Travel Regulation (FTR) by providing further clarification and establishing Department of Energy (DOE) policy on matters that the FTR left to Agency discretion. Cancels DOE M 552.1-1.

2006-02-17T23:59:59.000Z

427

Results of the Fall 2007 UC Davis Campus Travel Assessment  

E-Print Network (OSTI)

36 Figure 6-8 Yolo TMA Commuterit’s the largest employer in Yolo County. People travel fromEmployee LIM Figure 6-8 Yolo TMA Commuter Club awareness

Congleton, Christopher

2009-01-01T23:59:59.000Z

428

Confined blasts, and the impact of shock wave reflections on a human head and the related traumatic brain injury  

Science Journals Connector (OSTI)

We examine the effects of blast waves in a confined space on a human head model. A finite element human model (FEHM) is exposed to blast waves from explosions, as well as, to the reflected waves from the confinement walls. The intensity of the travelling blast shock waves is measured computationally and compared with experimental results. We monitor the mechanical response of the brain of the FEHM at different stand-off positions, either close to, or away from the surrounding walls in interaction with the travelling blast waves. The skull pressure, brain intracranial pressure (ICP), acceleration, shear stress, and principal stresses and strains are measured as the biomechanical parameters for injury diagnosis and compared for all the situations and stand-off positions considered. The results illustrate that the additional reflected shock waves due to the surrounding walls can dramatically change the brain biomechanical parameters.

Asghar Rezaei; Mehdi Salimi Jazi; Samad Javid; Ghodrat Karami; Mariusz Ziejewski

2014-01-01T23:59:59.000Z

429

Traveling length and minimal traveling time for flow through percolation networks with long-range spatial correlations  

E-Print Network (OSTI)

and production 1­4 . The geometry of an oil field can be very complex, displaying heterogeneities over a wide to displace oil to other wells. Ultimately the displac- ing fluid will break through into a production well where it must be separated from the oil. At this point, the rate of oil production decreases

Stanley, H. Eugene

430

of predictions of freeway travel time for traveler information on variable message signs (VMS). Previous work revealed that the main  

E-Print Network (OSTI)

of this paper is to study analytically the impacts of sensor spacing and penetration rate of probe vehicles vehicle penetration rate, and data aggregation level. For this analysis, the impacts of the prediction­estimation method, detector spacing, probe vehicle penetration rate, and traffic state transitions are emphasized

Bertini, Robert L.

431

Department of Mathematics Graduate Student Travel/Research Grant Application Instructions  

E-Print Network (OSTI)

Department of Mathematics Graduate Student Travel/Research Grant Application Instructions --Reverse side � Travel/Research Grant Application-- All graduate students enrolled in the PhD program are eligible for a department travel grant of up to $1,500. The Travel Grant funds are to be used for academic

Wolfe, Patrick J.

432

Section: Travel Revised Date: 07/26/2011 Procedure: 5.2.5  

E-Print Network (OSTI)

Unit Business Representative (UBR) Refer Purchasing Card questions to the Accounts Payable Office x5404Section: Travel Revised Date: 07/26/2011 Procedure: 5.2.5 Purchasing Card for Travel For travel) or an institutional liability purchasing card (PCard) for all reimbursable airfare, travel agency service fees, hotel

Saldin, Dilano

433

Fractional Electromagnetic Waves  

E-Print Network (OSTI)

In the present work we consider the electromagnetic wave equation in terms of the fractional derivative of the Caputo type. The order of the derivative being considered is 0 <\\gamma<1. A new parameter \\sigma, is introduced which characterizes the existence of the fractional components in the system. We analyze the fractional derivative with respect to time and space, for \\gamma = 1 and \\gamma = 1/2 cases.

J. F. Gómez; J. J. Rosales; J. J. Bernal; V. I. Tkach; M. Guía

2011-08-31T23:59:59.000Z

434

Optical control of large-signal properties of millimeter-wave and sub-millimeter-wave DDR Si IMPATTs  

Science Journals Connector (OSTI)

The authors have proposed a complete large-signal (L-S) model to investigate the optical modulation of high frequency properties of double-drift region (DDR) impact avalanche transit time (IMPATT) devices operating at different millimeter-wave and sub-millimeter-wave ... Keywords: DDR IMPATT device, Flip chip, Millimeter-wave, Optical control, Sub-millimeter-wave, Top mount

Aritra Acharyya, Suranjana Banerjee, J. P. Banerjee

2014-06-01T23:59:59.000Z

435

time coherence  

Science Journals Connector (OSTI)

In waves, such as acoustic and electromagnetic waves, pertaining to (a) the existence of a correlation between the phases of two waves, (b) between the phases of one wave at one spatial point at two or more in...

2001-01-01T23:59:59.000Z

436

Method and apparatus for actively controlling a micro-scale flexural plate wave device  

DOE Patents (OSTI)

An actively controlled flexural plate wave device provides a micro-scale pump. A method of actively controlling a flexural plate wave device produces traveling waves in the device by coordinating the interaction of a magnetic field with actively controlled currents. An actively-controlled flexural plate wave device can be placed in a fluid channel and adapted for use as a micro-scale fluid pump to cool or drive micro-scale systems, for example, micro-chips, micro-electrical-mechanical devices, micro-fluid circuits, or micro-scale chemical analysis devices.

Dohner, Jeffrey L. (Albuquerque, NM)

2001-01-01T23:59:59.000Z

437

Observations on waveforms of capillary and gravity-capillary waves  

Science Journals Connector (OSTI)

Due to extreme conditions in the field, there has not been any observational report on three-dimensional waveforms of short ocean surface waves. Three-dimensional waveforms of short wind waves can be found from integrating surface gradient image data (Zhang 1996a). Ocean surface gradient images are captured by an optical surface gradient detector mounted on a raft operating in the water offshore California (Cox and Zhang 1997). Waveforms and spatial structures of short wind waves are compared with early laboratory wind wave data (Zhang 1994, 1995). Although the large-scale wind and wave conditions are quite different, the waveforms are resoundingly similar at the small scale. It is very common, among steep short wind waves, that waves in the capillary range feature sharp troughs and flat crests. The observations show that most short waves are far less steep than the limiting waveform under weak wind conditions. Waveforms that resemble capillary-gravity solitons are observed with a close match to the form theoretically predicted for potential flows (Longuet-Higgins 1989, Vanden-Broeck and Dias 1992). Capillaries are mainly found as parasitic capillaries on the forward face of short gravity waves. The maximum wavelength in a parasitic wave train is less than a centimeter. The profiles of parasitic wave trains and longitudinal variations are shown. The phenomenon of capillary blockage (Phillips 1981) on dispersive freely traveling short waves is observed in the tank but not at sea. The short waves seen at sea propagate in all directions while waves in the tank are much more unidirectional.

Xin Zhang

1999-01-01T23:59:59.000Z

438

Final Report Phase I Study to Characterize the Market Potential for Non-Motorized Travel  

SciTech Connect

The idea of livable communities suggests that people should have the option to utilize non-motorized travel (NMT), specifically walking and bicycling, to conduct their daily tasks. Forecasting personal travel by walk and bike is necessary as part of regional transportation planning, and requires fine detail not only about individual travel, but also on transportation and neighborhood infrastructure. In an attempt to characterize the 'market' potential for NMT, the Office of Planning, Federal Highway Administration (FHWA) funded the Center for Transportation Analysis (CTA) of the Oak Ridge National Laboratory (ORNL) to conduct a study. The objectives of this effort were to identify factors that influence communities to walk and bike and to examine why, or why not, travelers walk and bike in their communities. This study relied on information collected under the 2009 National Household Travel Survey (NHTS) as the major source of data, and was supplemented with data from the American Community Survey (ACS), educational survey, health, employment, and others. Initial statistical screening methods were applied to sort through over 400 potential predictor variables, and examined with various measures (e.g., walk trip per person, walk mileage per person, bike trip per person, bike mileage per person) as the dependent variables. The best geographic level of detail used in the modeling for this study was determined to be the Census block group level for walking and Census tract level for biking. The need for additional supplemental private data (i.e., Walk Scores and Nielsen employment data), and geospatial information that reflects land use and physical environments, became evident after an examination of findings from the initial screening models. To be feasible, in terms of costs and time, the geographic scale of the study region was scaled down to nine selected NHTS add-on regions. These regions were chosen based on various criteria including transit availability, population size, and a mix of geographic locations across the nation. Given the similarities in modeling results from walk trips and walk mileages, additional modeling efforts conducted under the later part of this study were focused on walk trips per person. Bike models were limited only with the stepwise logistic models using Census tracts in the selected regions. Due to NHTS sampling limitations, only about 12% of these tracts have bike trips recorded from NHTS sampled households. The modeling with NHTS bike data proved to be more challenging and time consuming than what was anticipated. Along with the late arrival of Nielsen employment data, the project team had to limit the modeling effort to focus on walking. Therefore, the final modeling and discriminant analysis was conducted only for walking trips.

Hwang, Ho-Ling [ORNL; Reuscher, Tim [Macrosys; Wilson, Daniel W [ORNL; Schmoyer, Richard L [ORNL

2012-06-01T23:59:59.000Z

439

A dynamic vehicle routing problem based on real-time traffic information  

Science Journals Connector (OSTI)

We treat the dynamic vehicle routing problem with time windows (DVRPTW) in the context of real-time traffic information. We integrate traffic information obtained in real time to change the speed profile according to the accidents on the road network (congestion, etc.). The travel times are based on a time-dependent model in which the travel speeds are step functions. This model is enriched with an exponential smoothing function able to calculate the forecasted speed. The analysis of the results of these experiments shows that our method with real-time traffic information provides a good performance, a better robustness against a simple model with time dependent travel time.

Xin Zhao; Gilles Goncalves; Remy Dupas

2010-01-01T23:59:59.000Z

440

Inversion of Scattered Waves for Material Properties in Fractured Rock  

SciTech Connect

The authors apply a recently developed low-frequency, non-linear inversion method which includes near and far field terms to a crosshole data set to determine the bulk and shear modulus, as well as the density for a fractured zone in a granitic rock mass. The method uses the scattered elastic wavefield which is extracted from the recorded data before the inversion is performed. The inversion result is appraised by investigating the resolution and standard deviation of the model estimates. The sensitivity of the three parameters to different features of the medium is revealed. While the bulk modulus appears to be sensitive to voids and welded contacts, the density is mostly affected by fractured zones. The shear modulus is least constrained due to the absence of S wave anisotropy information. It is shown that the three medium parameters are generally sensitive to other medium features than those determined by velocity inversions. Thus this method is viewed as a complimentary approach to travel time tomography which provides more insight into the material properties of inhomogeneous media.

Gritto, Roland; Korneev, Valeri A.; Johnson, Lane R.

1999-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "wave travel time" 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

Inhomogeneous High Frequency Expansion-Free Gravitational Waves  

E-Print Network (OSTI)

We describe a natural inhomogeneous generalization of high frequency plane gravitational waves. The waves are high frequency waves of the Kundt type whose null propagation direction in space-time has vanishing expansion, twist and shear but is not covariantly constant. The introduction of a cosmological constant is discussed in some detail and a comparison is made with high frequency gravity waves having wave fronts homeomorphic to 2-spheres.

C. Barrabes; P. A. Hogan

2007-06-18T23:59:59.000Z

442

Numerical modelling of shock waves and detonation in complex geometries  

E-Print Network (OSTI)

Cumulation of shock snd detonation waves was considered. Computations were carried out by use of second-order central-difference scheme. Cumulation of waves in cone region with scales of 1 meter was studied. Pictures of flow in shock and detonation waves during different time moments were obtained as well as time dependences and maximum pressures for different corner angles.

Nevmerzhitskiy, Y V

2012-01-01T23:59:59.000Z

443

Secretary Chu to Travel to Houston Today | Department of Energy  

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

to Travel to Houston Today to Travel to Houston Today Secretary Chu to Travel to Houston Today July 8, 2010 - 12:00am Addthis Washington, D.C. - At the direction of President Obama, as part of the Administration's ongoing oil spill response efforts U.S. Energy Secretary Steven Chu is making his fifth trip to Houston today to continue to help identify strategies for containing the oil and ultimately killing the well. Secretary Chu and his scientific team are coordinating their work with National Incident Commander Admiral Thad Allen, who is leading the administration-wide response and directing all interagency activities. Information on the work that the Secretary, Department of Energy staff and independent scientists have done to date on the oil spill response can be found on DOE's BP Oil Spill page.

444

Have You Seen Renewable Energy Projects While Traveling? | Department of  

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

Seen Renewable Energy Projects While Traveling? Seen Renewable Energy Projects While Traveling? Have You Seen Renewable Energy Projects While Traveling? July 7, 2011 - 8:32am Addthis Since we blog about energy efficiency and renewable energy, it seems fitting that we would notice it even when we're not at work. This past Tuesday, Chris shared his first-hand views of Hawaii's renewable energy efforts while on vacation, including wind and solar, and did some post-vacation research that revealed some great information about how Hawaii is using renewable resources to achieve 70% clean energy by 2030. We're curious: Have you ever been on vacation or a business trip and noticed how another state is using renewable energy? Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. E-mail your

445

MONDAY: Secretary Chu Travels to New Jersey and Philadelphia | Department  

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

MONDAY: Secretary Chu Travels to New Jersey and Philadelphia MONDAY: Secretary Chu Travels to New Jersey and Philadelphia MONDAY: Secretary Chu Travels to New Jersey and Philadelphia September 24, 2010 - 12:00am Addthis WASHINGTON - On Monday, September 27, 2010, U.S. Energy Secretary Steven Chu and Representative Rush Holt will tour Applied Photovoltaics. With help from a Recovery Act-funded $1.1 million clean energy manufacturing tax credit, Applied Photovoltaics will manufacture solar energy modules for use in building-integrated photovoltaics. In the afternoon, Secretary Chu will tour the Princeton Plasma Physics Laboratory and speak to employees. He will then join Pennsylvania Governor Ed Rendell, Philadelphia Mayor Michael Nutter and other officials in an event highlighting the Energy Innovation Hub for energy-efficient buildings

446

Factors influencing self-drive vacation travellers' length of stay  

Science Journals Connector (OSTI)

The current research investigated the self-drive vacation travel market, examining determinants for demand for accommodations and the effects of external economic changes (e.g., fuel price fluctuation) on tourism. The study analysed data from two government data sources, a special survey module in the National Household Travel Survey which examined long distance trips, and the gas price index from the US Energy Information Administration. The present study compared two mainstream segments of the self-drive vacation market, which are self-drive vacation staying at commercial lodging facilities (SDV-lodging) and self-drive vacation staying at a friend or relative's accommodations (SDV-FR). Using the 2SLS model, the effects of the socio-demographic variables and travel-related variables were tested statistically. Statistical results showed that an endogeneity issue occurred in the SDV-lodging segment, revealing that 2SLS is better than the OLS estimation.

Sangchoul Yi; Jonathon Day; Liping A. Cai

2013-01-01T23:59:59.000Z

447

Secretary Chu Travels to Memphis | Department of Energy  

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

Travels to Memphis Travels to Memphis Secretary Chu Travels to Memphis January 31, 2011 - 2:33pm Addthis Ginny Simmons Ginny Simmons Former Managing Editor for Energy.gov, Office of Public Affairs What does this project do? The Sharp solar manufacturing plant has produced more than 2 million solar panels since 2002, increased its staff from 300 to 480 employees over the last year, and produces enough solar paneling to power more than 140,000 homes. Worldwide, FedEx Express is operating 329 hybrid and 19 all-electric vehicles, reducing fuel use by almost 300,000 gallons and carbon dioxide emissions by approximately 3,000 metric tons. Hero_CHU_Sharp Secretary Steven Chu with Sharp executive T.C. Jones, standing in front of some of Sharp's solar panels. Following the State of the Union on Tuesday and his online town hall on

448

Time (hole?) machines John Byron Manchak  

E-Print Network (OSTI)

Time (hole?) machines John Byron Manchak Department of Philosophy, University of Washington, Box machines Hole machines Time travel General relativity a b s t r a c t Within the context of general relativity, we consider a type of "time machine" and introduce the related "hole machine". We review what

Manchak, John

449

Developing marketing strategies for a travel destination in the USA using the nominal group technique  

Science Journals Connector (OSTI)

This paper demonstrates the application of nominal grouping as a cost-effective qualitative alternative for developing marketing strategies. The nominal group technique was used to generate strategic directions for the Blue Ridge Parkway Association, a popular travel destination in the USA. Using a nominal group composed of industry experts, a SWOT analysis produced a list of strengths, weaknesses, opportunities and threats associated with the Blue Ridge Parkway. Next, potential market segments were identified and prioritised. Five marketing strategies emerged to reach the specified market segments. The study illustrates that the nominal group technique offers a cost and time-efficient qualitative alternative in making strategic decisions.

J. Dana Clark; Michael J. Dotson; Dinesh S. Dave

2010-01-01T23:59:59.000Z

450

Plane waves Lumped systems  

E-Print Network (OSTI)

1 Impedance · Plane waves ­ Lumped systems S x y z Impedance · Plane waves ­ Lumped systems · open tube #12;2 Impedance · Plane waves ­ Lumped systems · closed tube Impedance · Cylindrical waves z x y r #12;3 Impedance · Cylindrical waves ­ Circumferential part n=0 n=1 n=2 n=3 Impedance · Cylindrical

Berlin,Technische Universität

451

The Department of Energy's Management of Foreign Travel, IG-0872  

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

The Department of Energy's Management of Foreign Travel DOE/IG-0872 October 2012 U.S. Department of Energy Office of Inspector General Office of Audits and Inspections Department of Energy Washington, DC 20585 October 16, 2012 MEMORANDUM FOR THE SECRETARY FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Management Alert: "The Department of Energy's Management of Foreign Travel" INTRODUCTION The Department of Energy and its workforce of 116,000 Federal and contractor personnel have numerous international exchanges and interactions at different levels and for a variety of important programmatic and other purposes. The Office of Inspector General is currently reviewing the Department's management of international offices and foreign assignments. As

452

An integrative model of consumers' intentions to purchase travel online  

Science Journals Connector (OSTI)

Abstract Grounded in the Theory of Reasoned Action, the Theory of Planned Behaviour, the Technology Acceptance Model and on the Innovation Diffusions Theory, this study proposes and empirically tests an integrated model to explore which factors affect intentions to purchase travel online. Partial Least Squares Structural Equation Modelling was conducted to assess the hypotheses. The empirical results, obtained in a sample of 1732 Internet users, indicate that intentions to purchase travel online are mostly determined by attitude, compatibility and perceived risk. The theoretical contributions of this study and the practical implications are discussed and future research directions are detailed.

Suzanne Amaro; Paulo Duarte

2015-01-01T23:59:59.000Z

453

Ecology Letien, (2001) 4 : 30-37 Periodic travelling waves in cyclic predator-prey  

E-Print Network (OSTI)

statistical methods, together with extensive spatiotempor- al data sets (reviewed by Bjornstad ct al. 1999

Sherratt, Jonathan A.

454

RESEARCH PAPER Effects of discrete-electrode configuration on traveling-wave  

E-Print Network (OSTI)

Microfluidics Á Fluid delivery Á Electronics cooling 1 Introduction Thermal management of electronic components in electronic systems. Additionally, the development of cell analysis tools has recently targeted microfluidic, 218 Engineering North, Stillwater, OK 74078, USA 123 Microfluid Nanofluid (2009) 6:221­230 DOI 10

455

REGULAR TRAVELING WAVES IN A ONE-DIMENSIONAL NETWORK OF THETA NEURONS  

E-Print Network (OSTI)

, JONATHAN RUBIN, AND BARD ERMENTROUT have the following form: C dVj dt = -Iion(Vj(t), wj(t)) - k gjksk

456

Compact acoustic travelling waves in a class of fluids with nonlinear material dispersion  

Science Journals Connector (OSTI)

...the closer beta(1) is to unity, the greater the peak value (g(0)) and maximum...gases composed of molecules possessing a great many degrees of freedom; see 2.5 of...we observe that is not a member of the class K(m,n)-(Rosenau Hyman 1993; Rosenau...

2012-01-01T23:59:59.000Z

457

TRAVELING-WAVE TUBE AMPLIFIER CHARACTERISTICS STUDY FOR STOCHASTIC BEAM COOLING EXPERIMENTS  

E-Print Network (OSTI)

on Sto­ chastic Cooling in ICE, Report CERN-EP-179- 16,Wikberg, Stochastic Cooling Tests in ICE Phys. Let. , 77B,

Leskovar, B.

2010-01-01T23:59:59.000Z

458

On travelling-wave solutions for a moving boundary problem of Hele–Shaw type  

Science Journals Connector (OSTI)

......Meulenbroek, 2006). Such discharge processes are observed in various...total ionization and is the electric potential in the non-ionized...boundary consists of circular arcs given equations of the form...fronts: regularization by electric screening? Phys. Rev. E......

Matthias Günther; Georg Prokert

2009-02-01T23:59:59.000Z

459

Weierstrass traveling wave solutions for dissipative Benjamin, Bona, and Mahony (BBM) equation  

E-Print Network (OSTI)

This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http-Riddle Aeronautical University, Daytona-Beach, Florida 32114-3900, USA (Received 21 February 2013; accepted 18 July amplitude and large wavelength of inviscid and incompressible fluids, derived an equation for the water

Spradlin, Gregory

460

FLUTTER PREDICTION OF A TRANSONIC FAN WITH TRAVELLING WAVE USING FULLY COUPLED FLUID/STRUCTURE INTERACTION  

E-Print Network (OSTI)

the stall. The predicted flutter boundary agrees well with the experiment. 1 Introduction Flutter flutter, choking flutter and acoustic flutter. Recent studies [4­9] have demonstrated the importance Copyright © 2013 by ASME Proceedings of ASME Turbo Expo 2013: Turbine Technical Conference and Exposition GT

Zha, Gecheng

Note: This page contains sample records for the topic "wave travel time" 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

Comparative study of travelling-wave and numerical solutions for the coupled short pulse (CSP) equation  

Science Journals Connector (OSTI)

The Lie symmetry analysis is performed for the coupled short plus (CSP) equation. We derive the infinitesimals that admit the classical symmetry group. Five types arise depending on the nature of the Lie symmetry generator. In all types, we find reductions in terms of system of ordinary differential equations, and exact solutions of the CSP equation are derived, which are compared with numerical solutions using the classical fourth-order Runge—Kutta scheme.

Vikas Kumar; R. K. Gupta; Ram Jiwari

2013-01-01T23:59:59.000Z

462

Publications 1. "Calculation of Beam Loading in Linear Traveling Wave Electron Accelerators," Review of  

E-Print Network (OSTI)

.N.E. Pt.C), Vol. 6, 135 (1964). 15. "Electron Cyclotron Heating in a Mirror Machine," (with D. T. Tuma, 2025 (1968). 18. "Non-Adiabatic and Stochastic Mechanisms for Cyclotron Resonance Trapping and Heating Cyclotron Interaction in a Magnetic Mirror Compression Experiment," (with D. T. Tuma and A. W. Trivelpiece

Kammen, Daniel M.

463

Applications of Traveling-Wave Electroabsorption Modulators in 160 Gbit/s Systems  

E-Print Network (OSTI)

been demonstrated with a 300- µm long InGaAsP-based TW-EAM [6], shown in Fig. 1. Ideally, the bandwidth) structure to vary the absorption of light according to the applied electric field. However, QW structures

Bowers, John

464

Ultrahigh-Speed Traveling-Wave Electroabsorption Modulator—Design and Analysis  

E-Print Network (OSTI)

structure with an InGaAsP bulk absorption layer,” Electron.InGaAsP–InP TW-EAM with 3- m-wide waveguide and 0.5- m-thick intrinsic absorptionInGaAsP–InP EAM with a 3- m- wide waveguide and a 0.3- m-thick intrinsic absorption

Yu, Paul K.L.

1999-01-01T23:59:59.000Z

465

Spatial asynchrony and periodic travelling waves in cyclic populations of field voles  

Science Journals Connector (OSTI)

...Linden, H. & Helle, E. 1997a Solar activity and hare dynamics...E. & Gosline, J. M. 1997 Solar activity and mammal cycles in...R. & Dale, M. 1993 Can solar cycle and climate synchronize the snowshoe hare cycle in Canada? Evidence from tree rings and...

1998-01-01T23:59:59.000Z

466

Some Evidence of Colinear Wind Stress and Wave Breaking  

Science Journals Connector (OSTI)

Data collected during the Surface Waves and Processes Program are employed to investigate a possible interrelation between wind stress and surface wave breaking. From comparison of data from 15 half-hour long time segments, the directions of the ...

Karl F. Rieder; Jerome A. Smith; Robert A. Weller

1996-11-01T23:59:59.000Z

467

Estimating Internal Wave Energy Fluxes in the Ocean  

Science Journals Connector (OSTI)

Energy flux is a fundamental quantity for understanding internal wave generation, propagation, and dissipation. In this paper, the estimation of internal wave energy fluxes ?u?p?? from ocean observations that may be sparse in either time or depth ...

Jonathan D. Nash; Matthew H. Alford; Eric Kunze

2005-10-01T23:59:59.000Z

468

Optical emission from a high-refractive-index waveguide excited by a traveling electron beam  

SciTech Connect

An optical emission scheme was demonstrated, in which a high-refractive-index waveguide is excited by a traveling electron beam in a vacuum environment. The waveguide was made of Si-SiO{sub 2} layers. The velocity of light propagating in the waveguide was slowed down to 1/3 of that in free space due to the high refractive index of Si. The light penetrated partly into the vacuum in the form of a surface wave. The electron beam was emitted from an electron gun and propagated along the surface of the waveguide. When the velocity of the electron coincided with that of the light, optical emission was observed. This emission is a type of Cherenkov radiation and is not conventional cathode luminescence from the waveguide materials because Si and SiO{sub 2} are transparent to light at the emitted wavelength. This type of emission was observed in an optical wavelength range from 1.2 to 1.6 {mu}m with an electron acceleration voltage of 32-42 kV. The characteristics of the emitted light, such as the polarization direction and the relation between the acceleration voltage of the electron beam and the optical wavelength, coincided well with the theoretical results. The coherent length of an electron wave in the vacuum was confirmed to be equal to the electron spacing, as found by measuring the spectral profile of the emitted light.

Kuwamura, Yuji; Yamada, Minoru; Okamoto, Ryuichi; Kanai, Takeshi; Fares, Hesham [Division of Electrical Engineering and Computer Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192 (Japan)

2008-11-15T23:59:59.000Z

469

On the application of circular–cylindrical waves to ocean wave power absorption  

Science Journals Connector (OSTI)

This study derives mathematical forms for the waves radiated from a heaving, surging and swaying point source on the surface of a three dimensional ocean. The interactions between a monochromatic plane wave and monochromatic circular–cylindrical radiated waves are examined, and solutions to the time averaged power are calculated. These calculations confirm pre-existing theoretical maximum absorption lengths for both a heaving and surging point source. The derivations also lead to the definition of the amplitude, phase and form of the radiated waves required to achieve these maximums. Two experimental case studies match measured radiated wave with circular waves. These matches demonstrate a correlation between the body motions and the dominant form of radiated waves as well as higher frequency waves. The study develops three general guidelines for the design of efficient point absorber wave energy converters (PAWECs). Optimum power absorption occurs when the PAWEC radiates theoretical heave and surge waves of the appropriate amplitude and phase. Theoretical sway type waves should be minimized as these radiate energy and do not interact with the incident wave. Similarly, the radiation of higher harmonic waves should also be minimized for the same reasons.

Matthew Wypych; Lan Le-Ngoc; Keith Alexander; Alister Gardner

2012-01-01T23:59:59.000Z

470

In Brief. ... Blue Crab Travels, Safety  

E-Print Network (OSTI)

for oceanographic work in the Virginian Sea over the continental shelf for the Virginia Institute of Marine Science in The Marine Newsleller. One trial showed that ice aboard boat lasted twice as long following use of the in- sulation, thus saving fuel for ice trips and increasing overall fishing time. Another boat owner estimated

471

On plane-wave relativistic electrodynamics in plasmas and in vacuum  

E-Print Network (OSTI)

We revisit the exact microscopic equations (in differential, and equivalent integral form) ruling a relativistic cold plasma after the plane-wave Ansatz, without customary approximations. We show that in the Eulerian description the motion of a very diluted plasma initially at rest and excited by an arbitrary transverse plane electromagnetic travelling-wave has a very simple and explicit dependence on the transverse electromagnetic potential; for a non-zero density plasma the above motion is a good approximation of the real one as long as the back-reaction of the charges on the electromagnetic field can be neglected, i.e. for a time lapse decreasing with the plasma density, and can be used as initial step in an iterative resolution scheme. As one of many possible applications, we use these results to describe how the ponderomotive force of a very intense and short plane laser pulse hitting normally the surface of a plasma boosts the surface electrons into the ion background. Because of this penetration the electrons are then pulled back by the electric force exerted by the ions and may leave the plasma with high energy in the direction opposite to that of propagation of the pulse [G. Fiore, R. Fedele, U. De Angelis, "The slingshot effect: a possible new laser-driven high energy acceleration mechanism for electrons", arXiv:1309.1400].

Gaetano Fiore

2014-05-02T23:59:59.000Z

472

Solar Eclipse Anomalies and Wave Refraction  

E-Print Network (OSTI)

There is some inconclusive evidence that measurement devices sensitive to local gravitation exhibit anomalous behaviour during solar eclipses. We investigate if these findings can be incorporated into the standard general relativistic model of gravitation. The General Theory of Relativity (GTR) describes gravitation as the response of an object to local spacetime curvature. Gravitational waves travelling at the speed of light are then a necessary mechanism to maintain the required consistency between local curvature and distant gravitating mass. Gravitational waves will certainly be subject to refraction by bodies such as the moon and we explore if such an effect can result in an error in the apparent position of the sources and thereby give rise to the characteristic pattern of response associated with the eclipse anomaly. It is found there are phenomenological similarities, but only if gravitational waves are considered not merely to respond to spacetime curvature but are also significantly affected by the presence of mass, perhaps in a manner analogous to electromagnetic waves propagating through matter.

Alasdair Macleod

2006-10-23T23:59:59.000Z

473

Wireless power transmission using ultrasonic guided waves  

Science Journals Connector (OSTI)

The unavailability of suitable power supply at desired locations is currently an important obstacle in the development of distributed, wireless sensor networks for applications such as structural health monitoring of aircraft. Proposed solutions range from improved batteries to energy harvesting from vibration, temperature gradients and other sources. A novel approach is being investigated at Cardiff University School of Engineering in cooperation with Airbus. It aims to utilise ultrasonic guided Lamb waves to transmit energy through the aircraft skin. A vibration generator is to be placed in a location where electricity supply is readily available. Ultrasonic waves generated by this device will travel through the aircraft structure to a receiver in a remote wireless sensor node. The receiver will convert the mechanical vibration of the ultrasonic waves back to electricity, which will be used to power the sensor node. This paper describes the measurement and modelling of the interference pattern which emerges when Lamb waves are transmitted continuously as in this power transmission application. The discovered features of the pattern, such as a large signal amplitude variation and a relatively high frequency, are presented and their importance for the development of a power transmission system is discussed.

A Kural; R Pullin; C Featherston; C Paget; K Holford

2011-01-01T23:59:59.000Z

474

Attenuation of sound waves in drill strings  

Science Journals Connector (OSTI)

During drilling of deep wells digital data are often transmitted from sensors located near the drill bit to the surface. Development of a new communication system with increased data capacity is of paramount importance to the drilling industry. Since steel drill strings are used transmission of these data by elastic carrier waves traveling within the drill pipe is possible but the potential communication range is uncertain. The problem is complicated by the presence of heavy?threaded tool joints every 10 m which form a periodic structure and produce classical patterns of passbands and stop bands in the wave spectra. In this article field measurements of the attenuation characteristics of a drill string in the Long Valley Scientific Well in Mammoth Lakes California are presented. Wave propagation distances approach 2 km. A theoretical model is discussed which predicts the location width and attenuation of the passbands. Mode conversion between extensional and bending waves and spurious reflections due to deviations in the periodic spacings of the tool joints are believed to be the sources of this attenuation. It is estimated that attenuation levels can be dramatically reduced by rearranging the individual pipes in the drill string according to length.

Douglas S. Drumheller

1993-01-01T23:59:59.000Z

475

Willingness to travel to avoid recreation conflicts in Danish forests  

Science Journals Connector (OSTI)

Abstract Conflicts among forest visitors have direct effects on the quality of a recreational experience. As the number of visitors to forests close to residential areas increases, as well as the number of different activities, so does the potential for perceived conflicts. According to the literature, expanding knowledge of conflict characteristics and their causes is important for recreation planners and managers who aim to reduce conflicts. In the present study, different forest user groups were identified and categorised according to their pursued activities, and for each group, causes of conflict were identified. Furthermore, a choice experiment was constructed to estimate the distance visitors are willing to travel to encounter few visitors as opposed to many visitors, and thereby potentially experience fewer conflicts. Comparing the marginal willingness to travel (WTT) of different user groups suggests that some groups have a WTT further than the average to reach a forest with ‘Few’ visitors. The average WTT to reach a forest area with ‘Few’ visitors. ‘Mountain bikers,’ ‘Peace and nature lovers’ and ‘Horse riders’ are willing to travel 4 km more than the average per visit to reach a less crowded forest. At the other end of the scale, we find that people who are doing physical exercise are willing to travel 2 km less than the average to reach a less crowded forest.

Fatemeh Bakhtiari; Jette Bredahl Jacobsen; Frank Søndergaard Jensen

2014-01-01T23:59:59.000Z

476

Travel Recommender Systems Francesco Ricci, eCommerce and Tourism  

E-Print Network (OSTI)

Travel Recommender Systems Francesco Ricci, eCommerce and Tourism Research Laboratory Recommender and tourism,3 the two most successful recommender system technologies (see Figure 1) are Triplehop's Trip Society Technologies for Tourism," Report of the Strategic Advisory Group on the 5th Framework Program

Ricci, Francesco

477

Philosophy Graduate Student Travel Grants Who Can Apply?  

E-Print Network (OSTI)

Philosophy Graduate Student Travel Grants Who Can Apply? Offered to continuing graduate students enrolled in a graduate program in the Department of Philosophy at the University of Calgary for the purpose during the period April 1, 2011 ­ March 31, 2012. How Do I Apply? Complete the Application for Philosophy

Habib, Ayman

478

Philosophy Graduate Student Travel Grants Who Can Apply?  

E-Print Network (OSTI)

Philosophy Graduate Student Travel Grants Who Can Apply? Offered to continuing graduate students enrolled in a graduate program in the Department of Philosophy at the University of Calgary for the purpose during the period April 1, 2013 ­ March 31, 2014. How Do I Apply? Complete the Application for Philosophy

Calgary, University of

479

Author's personal copy Unhealthy travelers present challenges to  

E-Print Network (OSTI)

Author's personal copy Unhealthy travelers present challenges to sustainable primate ecotourism: Ecotourism can function as a powerful tool for species conservation. However, a significant proportion.03.004 #12;Author's personal copy Introduction Ecotourism accounts for a significant proportion of all

Muehlenbein, Michael

480

Equity Evaluation of Vehicle Miles Traveled Fees in Texas  

E-Print Network (OSTI)

to the infrastructure but the money needed to maintain and improve roadways is not being adequately generated. One proposed alternative to the gas tax is the creation of a vehicle miles traveled (VMT) fee; with equity being a crucial issue to consider. This research...

Larsen, Lisa Kay

2012-10-19T23:59:59.000Z

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481

Revised: 2/21/13 Prospective Graduate Student Travel Grant  

E-Print Network (OSTI)

Revised: 2/21/13 Prospective Graduate Student Travel Grant From the Office of Graduate Studies Departments and interdisciplinary programs are invited to request a grant from the Office of Graduate Studies to assist with outstanding prospective graduate student campus visits. The purpose of this grant is to help

482

WITH A LITTLE HELP FROM MY Student Travel Awards  

E-Print Network (OSTI)

WITH A LITTLE HELP FROM MY FRIENDS OF THE #12;Student Travel Awards Ogugua Anene-Maidoh, Carmen de III, Benjamin Stengel, and Matthew Greseth #12;Oh I get by with a little help from my friends Holly Fest Bake Sale #12;Mmm, I get with a little help from my friends Friends Cafe #12;Mmm, I'm gonna try

483

Siting public electric vehicle charging stations in Beijing using big-data informed travel patterns of the taxi fleet  

Science Journals Connector (OSTI)

Abstract Charging infrastructure is critical to the development of electric vehicle (EV) system. While many countries have implemented great policy efforts to promote EVs, how to build charging infrastructure to maximize overall travel electrification given how people travel has not been well studied. Mismatch of demand and infrastructure can lead to under-utilized charging stations, wasting public resources. Estimating charging demand has been challenging due to lack of realistic vehicle travel data. Public charging is different from refueling from two aspects: required time and home-charging possibility. As a result, traditional approaches for refueling demand estimation (e.g. traffic flow and vehicle ownership density) do not necessarily represent public charging demand. This research uses large-scale trajectory data of 11,880 taxis in Beijing as a case study to evaluate how travel patterns mined from big-data can inform public charging infrastructure development. Although this study assumes charging stations to be dedicated to a fleet of PHEV taxis which may not fully represent the real-world situation, the methodological framework can be used to analyze private vehicle trajectory data as well to improve our understanding of charging demand for electrified private fleet. Our results show that (1) collective vehicle parking “hotspots” are good indicators for charging demand; (2) charging stations sited using travel patterns can improve electrification rate and reduce gasoline consumption; (3) with current grid mix, emissions of CO2, PM, SO2, and \\{NOx\\} will increase with taxi electrification; and (4) power demand for public taxi charging has peak load around noon, overlapping with Beijing’s summer peak power.

Hua Cai; Xiaoping Jia; Anthony S.F. Chiu; Xiaojun Hu; Ming Xu

2014-01-01T23:59:59.000Z

484

What Is the Nature of Space and Time?  

Science Journals Connector (OSTI)

The most successful science fiction television series in the history of the medium is undoubtedly Doctor Who. The lead character, who calls himself the Doctor, is a Time Lord, who travels through space and tim...

Barry B. Luokkala

2014-01-01T23:59:59.000Z

485

International Studies Office Student travel to Guatemala, Honduras, El Salvador and Nicaragua Restricted  

E-Print Network (OSTI)

International Studies Office Student travel to Guatemala, Honduras, El Salvador and Nicaragua Committee for Education Abroad has restricted student travel to Guatemala, Honduras, El Salvador Salvador, Honduras, and Nicaragua may follow the guidelines documented at: Procedures. The decision

Acton, Scott

486

Fact #842: October 13, 2014 Vehicles and Vehicle Travel Trends have Changed Since 2008  

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

As the U.S. population has doubled from 1950 to 2012, the number of vehicles has grown nearly 6-fold and vehicle travel even more than that. The number of vehicles and vehicle travel peaked in 2007...

487

Energy Secretary Steven Chu to Travel to Bay Area to Highlight...  

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

Chu to Travel to Bay Area to Highlight State of the Union Address, Commitment to Clean Energy Energy Secretary Steven Chu to Travel to Bay Area to Highlight State of the Union...

488

E-Print Network 3.0 - advanced traveler information Sample Search...  

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

by Explorit Topic List Advanced Search Sample search results for: advanced traveler information Page: << < 1 2 3 4 5 > >> 1 Page 1 of 2 Travel Advance Requirements Summary: Page 1...

489

E-Print Network 3.0 - air travelers switzerland Sample Search...  

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

Travel Reimbursement Policy UT-B Contracts Div Page 1 of 2 Summary: or the first U.S. airport at which the traveler's flight arrives. (iii) "International air transportation... )...

490

Fact #552: January 5, 2009 Vehicle Miles of Travel by Region  

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

Total vehicle miles of travel (VMT) in the U.S. have declined from 2007 to 2008. The latest data available, September 2008, shows a 4.4% decline in travel that varies by region. Comparing September...

491

Fact #729: May 28, 2012 Secondary Household Vehicles Travel Fewer Miles  

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

When a household has more than one vehicle, the secondary vehicles travel fewer miles than the primary vehicle. In a two-vehicle household, the second vehicle travels less than half of the miles...

492

Discrete control of resonant wave energy devices  

Science Journals Connector (OSTI)

...time domain, which allows us to find non-harmonic...first applied to the wave energy area by Hoskin Nichols...Clement, A. H. 2002Wave energy in Europe: current status and perspectivesRenew. Sustain. Energy Rev. 6 405431 10.1016...

2012-01-01T23:59:59.000Z

493

Wave-Packet Revivals for Quantum Systems with Nondegenerate Energies  

E-Print Network (OSTI)

The revival structure of wave packets is examined for quantum systems having energies that depend on two nondegenerate quantum numbers. For such systems, the evolution of the wave packet is controlled by two classical periods and three revival times. These wave packets exhibit quantum beats in the initial motion as well as new types of long-term revivals. The issue of whether fractional revivals can form is addressed. We present an analytical proof showing that at certain times equal to rational fractions of the revival times the wave packet can reform as a sum of subsidiary waves and that both conventional and new types of fractional revivals can occur.

Robert Bluhm; Alan Kostelecky; Bogdan Tudose

1996-09-26T23:59:59.000Z

494

Sharp shock model for propagating detonation waves  

SciTech Connect

Recent analyses of the reactive Euler equations have led to an understanding of the effect of curvature on an underdriven detonation wave. This advance can be incorporated into an improved sharp shock model for propagating detonation waves in hydrodynamic calculations. We illustrate the model with two simple examples: time dependent propagation of a diverging detonation wave in 1-D, and the steady 2-D propagation of a detonation wave in a rate stick. Incorporating this model into a 2-D front tracking code is discussed. 20 refs., 3 figs.

Bukiet, B.; Menikoff, R.

1989-01-01T23:59:59.000Z

495

Faculty Travel Grant Program Terms Revised: LS 11-06-12 Page 1  

E-Print Network (OSTI)

Faculty Travel Grant Program Terms Revised: LS 11-06-12 Page 1 Office of Research Services Phone: (250) 807 9412 UBC Okanagan Campus Internal Grants Program Terms FACULTY TRAVEL GRANT Value: Up to $1 the deadline will be moved to 4 pm of the first working day that follows. Faculty Travel Grant Details Purpose

Michelson, David G.

496

Faculty Travel Grant Program Terms Revised: AW 09-18-13 Page 1  

E-Print Network (OSTI)

Faculty Travel Grant Program Terms Revised: AW 09-18-13 Page 1 Office of Research Services Phone: (250) 807 9412 UBC Okanagan Campus Internal Grants Program Terms FACULTY TRAVEL GRANT Value: Up to $1 the deadline will be moved to 4 pm of the first working day that follows. Faculty Travel Grant Details Purpose

Handy, Todd C.

497

Syracuse University Department of Chemistry 2014-2015 Graduate Student Travel Grant Proposal  

E-Print Network (OSTI)

Syracuse University � Department of Chemistry 2014-2015 Graduate Student Travel Grant Proposal may be made per student per fiscal year (July 1 to June 30). Travel grants will normally not exceed. #12;Syracuse University � Department of Chemistry 2014-2015 Graduate Student Travel Grant Proposal

Doyle, Robert

498

Waves in Plasmas  

SciTech Connect

Quadratic corrections to the metaplectic formulation of mode conversions. In this work we showed how to systematically deal with quadratic corrections beyond the usual linearization of the dispersion matrix at a conversion. The linearization leads to parabolic cylinder functions as the local approximation to the full-wave behavior, but these do not include the variation in amplitude associated with ray refraction in the neighborhood of the conversion. Hence, the region over which they give a good fit to the incoming and outgoing WKB solutions is small. By including higher order corrections it is possible to provide a much more robust matching. We also showed that it was possible, in principle, to extend these methods to arbitrary order. A new normal form for mode conversion. This is based upon our earlier NSF-DOE-funded work on ray helicity. We have begun efforts to apply these new ideas in practical ray tracing algorithms. Group theoretical foundation of path integrals and phase space representations of wave problems. Using the symbol theory of N. Zobin, we developed a new understanding of path integrals on phase space. The initial goal was to find practical computational tools for dealing with non-standard mode conversions. Along the way we uncovered a new way to represent wave functions directly on phase space without the intermediary of a Wigner function. We are exploring the use of these ideas for numerical studies of conversion, with the goal of eventually incorporating kinetic effects. Wave packet studies of gyroresonance crossing. In earlier work, Huanchun Ye and Allan Kaufman -- building upon ideas due to Lazar Friedland -- had shown that gyroresonance crossings could be treated as a double conversion. This perspective is one we have used for many of our papers since then. We are now performing a detailed numerical comparison between full-wave and ray tracing approaches in the study of minority-ion gyroresonance crossing. In this study, a fast magnetosonic wave -- supported by a majority-ion species such as deuterium -- crosses the resonance layer associated with a minority species, such as hydrogen. By using wave packets instead of harmonic solutions, it becomes easy to see the evolution in k-space of the minority-ion disturbance, and the time delay for emission of the reflected fast-wave packet. Iterated conversion in a cavity. When mode conversion occurs in a cavity where rays are trapped, multiple conversions will occur and the resulting absorption profile will typically have a complicated spatial dependence due to overlapping interference patterns. The goal of this work is to develop fast and efficient ray-based methods for computing the cavity response to external driving, and to compute the spatial absorption profile. We have introduced a new approach that allows us to visualize in great detail the underlying iterated ray geometry, and should lead to simpler methods for identifying parameter values where global changes occur in the qualitative response (e.g. global bifurcations).

Tracy, Eugene R

2009-09-21T23:59:59.000Z

499

Refrigeration system having standing wave compressor  

DOE Patents (OSTI)

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

Lucas, Timothy S. (Glen Allen, VA)

1992-01-01T23:59:59.000Z

500

Some Wave Equations for Electromagnetism and Gravitation  

E-Print Network (OSTI)

The paper studies the inferences of wave equations for electromagnetic fields when there are gravitational fields at the same time. In the description with the algebra of octonions, the inferences of wave equations are identical with that in conventional electromagnetic theory with vector terminology. By means of the octonion exponential function, we can draw out that the electromagnetic waves are transverse waves in a vacuum, and rephrase the law of reflection, Snell's law, Fresnel formula, and total internal reflection etc. The study claims that the theoretical results of wave equations for electromagnetic strength keep unchanged in the case for coexistence of gravitational and electromagnetic fields. Meanwhile the electric and magnetic components of electromagnetic waves can not be determined simultaneously in electromagnetic fields.

Zi-Hua Weng

2010-08-11T23:59:59.000Z