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1

Recent developments in guided wave travel time tomography  

SciTech Connect (OSTI)

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 (OSTI)

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

Traveling-wave photodetector  

DOE Patents [OSTI]

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. 4 figures.

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

1993-12-14T23:59:59.000Z

4

Traveling-wave photodetector  

SciTech Connect (OSTI)

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

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

6

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

7

Topological horseshoes in travelling waves of discretized nonlinear wave equations  

SciTech Connect (OSTI)

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

8

Empirical Measurements of Travelers' Value of Travel Time Reliability  

E-Print Network [OSTI]

Travel time and travel time reliability are two fundamental factors influencing travel behavior and demand. The concept of the value of time (VOT) has been extensively studied, and estimates of VOT have been obtained from surveys and empirical data...

Danda, Santosh Rao

2014-08-12T23:59:59.000Z

9

the wave model A traveling wave is an organized disturbance  

E-Print Network [OSTI]

1 waves the wave model A traveling wave is an organized disturbance propagating at a well-defined wave speed v. · In transverse waves the particles of the medium move perpendicular to the direction of wave propagation. · In longitudinal waves the particles of the medium move parallel to the direction

Winokur, Michael

10

A novel wideband gyrotron travelling wave amplifier  

E-Print Network [OSTI]

We present the design and the experimental results of a novel wideband quasioptical Gyrotron Traveling Wave Tube (gyro-TWT) amplifier and the first Vacuum Electron Device (VED) with a Photonic Band Gap (PBG) structure. The ...

Sirigiri, Jagadishwar R. (Jagadishwar Rao), 1973-

2003-01-01T23:59:59.000Z

11

Traveling water waves with point vortices  

E-Print Network [OSTI]

We construct small-amplitude solitary traveling gravity-capillary water waves with a finite number of point vortices along a vertical line, on finite depth. This is done using a local bifurcation argument. The properties of the resulting waves are also examined: We find that they depend significantly on the position of the point vortices in the water column.

Kristoffer Varholm

2015-03-20T23:59:59.000Z

12

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

13

Submitted for publication. A constructive approach to traveling waves in  

E-Print Network [OSTI]

be observed in chemotactic species. One of them are traveling waves or pulses which spread trough traveling wave solutions for (1) in the cylindrical domain\\Omega = IR \\Theta \\Gamma, where \\Gamma

14

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

15

Superconducting travelling wave ring with high gradient accelerating section  

SciTech Connect (OSTI)

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

16

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

17

EXISTENCE, UNIQUENESS, AND ASYMPTOTIC STABILITY OF TRAVELING WAVES  

E-Print Network [OSTI]

.1) where A is a nonlinear operator which is independent of the time t, maps functions of space variable \\Delta to functions of x, and, via (1.1), generates a semi­group on the Banach space L 1 (IR). We assume U (¸) = 1; lim ¸!\\Gamma1 U (¸) = 0: (1.5) We call c the traveling wave speed and U the profile

18

EXISTENCE, UNIQUENESS, AND ASYMPTOTIC STABILITY OF TRAVELING WAVES  

E-Print Network [OSTI]

A is a nonlinear operator which is independent of the time t, maps functions of space variable to functions of x, and, via (1.1), generates a semi-group on the Banach space L1(IR). We assume that A is translation) is a solution of (1.1) and lim!1 U() = 1; lim! 1 U() = 0: (1.5) We call c the traveling wave speed and U the pro

19

Traveling waves in the Baer and Rinzel model of spine studded dendritic tissue  

E-Print Network [OSTI]

-trains is explained within a kinematic framework that is based on the times of wave pulses. The dispersion curve of stability that may be applied to solutions of the traveling wave equations. The kinematic theory correctly waves, dendritic spines, connections to periodics, kinematic formalism 2 #12;1 Introduction As dendrites

20

Existence of traveling wave solutions of a high-order nonlinear ...  

E-Print Network [OSTI]

Jan 27, 2009 ... Traveling wave solutions in the form of solitons have been studied in ... applied similar analysis techniques to the problem of traveling wave.

Min Chen; Monica Torres; Timothy Walsh

2009-02-11T23:59:59.000Z

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

A PRACTICAL SCHEME FOR ARTERIAL TRAVEL TIME ESTIMATION BASED ON VEHICLE RE-IDENTIFICATION USING WIRELESS SENSORS  

E-Print Network [OSTI]

applicable kinematic wave model to construct a link travel time estimate from 30-second flow and occupancy the kinematic wave model (with known or estimated congestion wave speed and jam density), it is straightforward

Varaiya, Pravin

22

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

23

Wormholes and Time Travel? Not Likely  

E-Print Network [OSTI]

Wormholes have been advanced as both a method for circumventing the limitations of the speed of light as well as a means for building a time machine (to travel to the past). Thus it is argued that General Relativity may allow both of these possibilities. In this note I argue that traversable wormholes connecting otherwise causally disconnected regions, violate two of the most fundamental principles physics, namely local energy conservation and the energy-time uncertainty principle.

Leonard Susskind

2005-04-08T23:59:59.000Z

24

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

25

Ozone heating and the destabilization of traveling waves during summer  

SciTech Connect (OSTI)

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

26

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

27

Arterial Travel Time Estimation Based On Vehicle Re-Identification Using Wireless Magnetic Sensors  

E-Print Network [OSTI]

and Geroliminis (2005) develop a generally applicable kinematic wave model to construct a link travel time calculated queue at the intersection, and using the kinematic wave model (with known or estimated congestion wave speed and jam density), it is straightforward to figure out the delay faced by each of the n

Varaiya, Pravin

28

Traveling-wave device with mass flux suppression  

DOE Patents [OSTI]

A traveling-wave device is provided with the conventional moving pistons eliminated. Acoustic energy circulates in a direction through a fluid within a torus. A side branch may be connected to the torus for transferring acoustic energy into or out of the torus. A regenerator is located in the torus with a first heat exchanger located on a first side of the regenerator downstream of the regenerator relative to the direction of the circulating acoustic energy; and a second heat exchanger located on an upstream side of the regenerator. The improvement is a mass flux suppressor located in the torus to minimize time-averaged mass flux of the fluid. In one embodiment, the device further includes a thermal buffer column in the torus to thermally isolate the heat exchanger that is at the operating temperature of the device.

Swift, Gregory W. (Santa Fe, NM); Backhaus, Scott N. (Los Alamos, NM); Gardner, David L. (White Rock, NM)

2000-01-01T23:59:59.000Z

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

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

31

Tuning gain and bandwidth of traveling wave tubes using metamaterial beam-wave interaction structures  

SciTech Connect (OSTI)

We employ metamaterial beam-wave interaction structures for tuning the gain and bandwidth of short traveling wave tubes. The interaction structures are made from metal rings of uniform cross section, which are periodically deployed along the length of the traveling wave tube. The aspect ratio of the ring cross sections is adjusted to control both gain and bandwidth. The frequency of operation is controlled by the filling fraction of the ring cross section with respect to the size of the period cell.

Lipton, Robert, E-mail: lipton@math.lsu.edu; Polizzi, Anthony, E-mail: polizzi@math.lsu.edu [Department of Mathematics, Louisiana State University, Baton Rouge, Louisiana 70803-4918 (United States)

2014-10-14T23:59:59.000Z

32

Exact Coherent Structures in Pipe Flow: Travelling Wave Solutions  

E-Print Network [OSTI]

1 Exact Coherent Structures in Pipe Flow: Travelling Wave Solutions H. Wedin & R.R. Kerswell pipe. They consist of three well-defined flow features - streamwise rolls and streaks which dominate symmetry they possess about the pipe axis with m = 1, 2, 3, 4, 5 and 6 solutions identified. All are born

Burton, Geoffrey R.

33

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

34

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.

35

Enabling time travel for the scholarly web  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-Series toESnet4: Networking for37 East and WestLydiaEnabling time travel for the

36

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

37

TRAVELING WAVES IN A FINITE CONDENSATION RATE MODEL FOR STEAM INJECTION  

E-Print Network [OSTI]

TRAVELING WAVES IN A FINITE CONDENSATION RATE MODEL FOR STEAM INJECTION J. BRUINING AND C.J. VAN DUIJN Abstract. Steam drive recovery of oil is an economical way of producing oil even in times of low oil prices and is used world wide. This paper focuses on the one-dimensional setting, where steam

Eindhoven, Technische Universiteit

38

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

39

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

SciTech Connect (OSTI)

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

40

Spent fuel utilization in a compact traveling wave reactor  

SciTech Connect (OSTI)

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

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

Traveling Wave RF Systems for Helical Cooling Channels  

SciTech Connect (OSTI)

The great advantage of the helical ionization cooling channel (HCC) is its compact structure that enables the fast cooling of muon beam 6-dimensional phase space. This compact aspect requires a high average RF gradient, with few places that do not have cavities. Also, the muon beam is diffuse and requires an RF system with large transverse and longitudinal acceptance. A traveling wave system can address these requirements. First, the number of RF power coupling ports can be significantly reduced compared with our previous pillbox concept. Secondly, by adding a nose on the cell iris, the presence of thin metal foils traversed by the muons can possibly be avoided. We show simulations of the cooling performance of a traveling wave RF system in a HCC, including cavity geometries with inter-cell RF power couplers needed for power propagation.

Yonehara, K.; Lunin, A.; Moretti, A.; Popovic, M.; Romanov, G.; /Fermilab; Neubauer, M.; Johnson, R.P.; /Muons Inc., Batavia; Thorndahl, L.; /CERN

2009-05-01T23:59:59.000Z

42

From travelling waves to mild chaos: a supercritical bifurcation cascade in pipe flow  

E-Print Network [OSTI]

We study numerically a succession of transitions in pipe Poiseuille flow that leads from simple travelling waves to waves with chaotic time-dependence. The waves at the origin of the bifurcation cascade possess a shift-reflect symmetry and are both axially and azimuthally periodic with wave numbers {\\kappa} = 1.63 and n = 2, respectively. As the Reynolds number is increased, successive transitions result in a wide range of time dependent solutions that includes spiralling, modulated-travelling, modulated-spiralling, doubly-modulated-spiralling and mildly chaotic waves. We show that the latter spring from heteroclinic tangles of the stable and unstable invariant manifolds of two shift-reflect-symmetric modulated-travelling waves. The chaotic set thus produced is confined to a limited range of Reynolds numbers, bounded by the occurrence of manifold tangencies. The states studied here belong to a subspace of discrete symmetry which makes many of the bifurcation and path-following investigations presented technically feasible. However, we expect that most of the phenomenology carries over to the full state-space, thus suggesting a mechanism for the formation and break-up of invariant states that can sustain turbulent dynamics.

Fernando Mellibovsky; Bruno Eckhardt

2011-10-06T23:59:59.000Z

43

ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE  

E-Print Network [OSTI]

ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE Final Report AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE 5. Report Date June 2007 Final Report 6

Bertini, Robert L.

44

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

45

ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE  

E-Print Network [OSTI]

ASSESSMENT AND REFINEMENT OF REAL- TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE (OTREC PHASE I) Final Report #12;#12;ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE (OTREC PHASE 1) 5. Report

Bertini, Robert L.

46

Velocity bunching in travelling wave accelerator with low acceleration gradient  

E-Print Network [OSTI]

We present the analytical and simulated results concerning the influences of the acceleration gradient in the velocity bunching process, which is a bunch compression scheme that uses a traveling wave accelerating structure as a compressor. Our study shows that the bunch compression application with low acceleration gradient is more tolerant to phase jitter and more successful to obtain compressed electron beam with symmetrical longitudinal distribution and low energy spread. We also present a transverse emittance compensation scheme to compensate the emittance growth caused by the increasing of the space charge force in the compressing process that is easy to be adjusted for different compressing factors.

Huang, Rui-Xuan; Li, Wei-Wei; Jia, Qi-Ka

2013-01-01T23:59:59.000Z

47

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

48

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

49

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

50

Fast Traveling-Wave Reactor of the Channel Type  

E-Print Network [OSTI]

The main aim of this paper is to solve the technological problems of the TWR based on the technical concept described in our priority of invention reference, which makes it impossible, in particular, for the fuel claddings damaging doses of fast neutrons to excess the ~200 dpa limit. Thus the essence of the technical concept is to provide a given neutron flux at the fuel claddings by setting the appropriate speed of the fuel motion relative to the nuclear burning wave. The basic design of the fast uranium-plutonium nuclear traveling-wave reactor with a softened neutron spectrum is developed, which solves the problem of the radiation resistance of the fuel claddings material.

Rusov, Vitaliy D; Vashchenko, Volodymyr N; Chernezhenko, Sergei A; Kakaev, Andrei A; Pantak, Oksana I

2015-01-01T23:59:59.000Z

51

Publications 1. "Calculation of Beam Loading in Linear Traveling Wave Electron Accelerators," Review of  

E-Print Network [OSTI]

Publications 1. "Calculation of Beam Loading in Linear Traveling Wave Electron Accelerators). 26 "Stochastic and Adiabatic Behavior of Particles Accelerated by Periodic Forces," (M. A. Lieberman

Kammen, Daniel M.

52

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

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

Success Stories Contact Us Index Home | ORNL | Events and Conferences Travel Time Reliability: Its Measurement and Prediction Apr 02 2014 10:00 AM - 11:00 AM George List, North...

53

Statistical sampling plans for travel time measurement in urban areas  

E-Print Network [OSTI]

and Vehicle Advisory Navigation Concept (ADVANCE) project, an IVHS operational test in the suburbs of Chicago, will be utilizing approximately 5, 000 probe vehicles for the collection of travel time information via in-vehicle navigation and information...

Turner, Shawn

1993-01-01T23:59:59.000Z

54

Three-cell traveling wave superconducting test structure  

SciTech Connect (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 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

55

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

SciTech Connect (OSTI)

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

56

Modeling highway travel time distribution with conditional probability models  

SciTech Connect (OSTI)

ABSTRACT Under the sponsorship of the Federal Highway Administration's Office of Freight Management and Operations, the American Transportation Research Institute (ATRI) has developed performance measures through the Freight Performance Measures (FPM) initiative. Under this program, travel speed information is derived from data collected using wireless based global positioning systems. These telemetric data systems are subscribed and used by trucking industry as an operations management tool. More than one telemetric operator submits their data dumps to ATRI on a regular basis. Each data transmission contains truck location, its travel time, and a clock time/date stamp. Data from the FPM program provides a unique opportunity for studying the upstream-downstream speed distributions at different locations, as well as different time of the day and day of the week. This research is focused on the stochastic nature of successive link travel speed data on the continental United States Interstates network. Specifically, a method to estimate route probability distributions of travel time is proposed. This method uses the concepts of convolution of probability distributions and bivariate, link-to-link, conditional probability to estimate the expected distributions for the route travel time. Major contribution of this study is the consideration of speed correlation between upstream and downstream contiguous Interstate segments through conditional probability. The established conditional probability distributions, between successive segments, can be used to provide travel time reliability measures. This study also suggests an adaptive method for calculating and updating route travel time distribution as new data or information is added. This methodology can be useful to estimate performance measures as required by the recent Moving Ahead for Progress in the 21st Century Act (MAP 21).

Oliveira Neto, Francisco Moraes [ORNL] [ORNL; Chin, Shih-Miao [ORNL] [ORNL; Hwang, Ho-Ling [ORNL] [ORNL; Han, Lee [University of Tennessee, Knoxville (UTK)] [University of Tennessee, Knoxville (UTK)

2014-01-01T23:59:59.000Z

57

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

E-Print Network [OSTI]

With the advent of Advanced Traveler Information Systems (ATIS), short-term travel time prediction is becoming increasingly important. Travel time can be obtained directly from instrumented test vehicles, license plate matching, probe vehicles etc...

Vanajakshi, Lelitha Devi

2005-11-01T23:59:59.000Z

58

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

59

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

60

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

SciTech Connect (OSTI)

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

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

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.

62

A Monte Carlo simulation for kinetic chemotaxis models: an application to the traveling population wave  

E-Print Network [OSTI]

A Monte Carlo simulation for the chemotactic bacteria is developed on the basis of the kinetic modeling, i.e., the Boltzmann transport equation, and applied to the one-dimensional traveling population wave in a micro channel.In this method, the Monte Carlo method, which calculates the run-and-tumble motions of bacteria, is coupled with a finite volume method to solve the macroscopic transport of the chemical cues in the field. The simulation method can successfully reproduce the traveling population wave of bacteria which was observed experimentally. The microscopic dynamics of bacteria, e.g., the velocity autocorrelation function and velocity distribution function of bacteria, are also investigated. It is found that the bacteria which form the traveling population wave create quasi-periodic motions as well as a migratory movement along with the traveling population wave. Simulations are also performed with changing the sensitivity and modulation parameters in the response function of bacteria. It is found th...

Yasuda, Shugo

2015-01-01T23:59:59.000Z

63

Travel  

E-Print Network [OSTI]

in ancient Greece, Egypt and the Near East, Leicester2007 Travel in third and second millennium Egypt. InTheban Desert Road Survey. In Egypt and Nubia: Gift of the

Köpp-Junk, Heidi

2013-01-01T23:59:59.000Z

64

Studies of the superconducting traveling wave cavity for high gradient LINAC  

E-Print Network [OSTI]

Use of a traveling wave (TW) accelerating structure with a small phase advance per cell instead of standing wave may provide a significant increase of accelerating gradient in a superconducting linear accelerator. The TW section achieves an accelerating gradient 1.2-1.4 larger than TESLA-shaped standing wave cavities for the same surface electric and magnetic fields. Recent tests of an L-band single-cell cavity with a waveguide feedback demonstrated an accelerating gradient comparable to the gradient in a single-cell ILC-type cavity from the same manufacturer. This article presents the next stage of the 3- cell TW resonance ring development which will be tested in the traveling wave regime. The main simulation results of the microphonics and Lorentz Force Detuning (LFD) are also considered.

Avrakhov, Pavel; Kanareykin, Alexei; Solyak, Nikolay; Yakovlev, Vyacheslav P

2015-01-01T23:59:59.000Z

65

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

E-Print Network [OSTI]

. This research presents a new solution approach, an iterative route construction and improvement algorithm (IRCI such as greenhouse gases, noise, and air pollution. Routing models with time-varying travel times are gaining greater attention in vehicle routing literature and industry. However, research on the time dependent vehicle

Bertini, Robert L.

66

Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier  

E-Print Network [OSTI]

The theory, design, and experimental results of a wideband 140-GHz 1-kW pulsed gyro-traveling-wave amplifier (gyro-TWA) are presented. The gyro-TWA operates in the HE [subscript 06] mode of an overmoded quasi-optical ...

Temkin, Richard J.

67

PULSATING TRAVELING WAVES IN THE SINGULAR LIMIT OF A REACTION-DIFFUSION SYSTEM IN SOLID  

E-Print Network [OSTI]

. This model has been extensively used in solid combustion (to analyze SHS, i.e. Self- propagating High, singular limit, pulsating traveling wave, high acti- vation energy, Stefan problem, free boundary, Self-propagating High temperature Synthesis. G.S. Weiss has been partially supported by the Grant-in-Aid 15740100

Monneau, Régis

68

Discrete choice models of traveler participation in differential time of day pricing programs  

E-Print Network [OSTI]

variable pricing experiments, there is little empirical data on potential traveler response and traf Tolls that vary based on time of day or congestion are gaining attention around the world as a potential travel demand management strategy that can shift peak period travel to off peak periods thereby

Burris, Mark W.

69

Propagation of travelling waves in sub-excitable systems driven by noise and periodic forcing  

E-Print Network [OSTI]

It has been reported that traveling waves propagate periodically and stably in sub-excitable systems driven by noise [Phys. Rev. Lett. \\textbf{88}, 138301 (2002)]. As a further investigation, here we observe different types of traveling waves under different noises and periodic forces, using a simplified Oregonator model. Depending on different noises and periodic forces, we have observed different types of wave propagation (or their disappearance). Moreover, the reversal phenomena are observed in this system based on the numerical experiments in the one-dimensional space. As an explanation, we regard it as the effect of periodic forces. Thus, we give qualitative explanations to how reversal phenomena stably appear, which seem to arise from the mixing function of the periodic force and the noise. And the output period and three velocities (the normal, the positive and the negative) of the travelling waves are defined and their relationship with the periodic forces, along with the types of waves, are also studied in sub-excitable system under a fixed noise intensity.

Fen-Ni Si; Quan-Xing Liu; Jin-Zhong Zhang; Lu-Qun Zhou

2007-11-23T23:59:59.000Z

70

Comparison of actinide production in traveling wave and pressurized water reactors  

SciTech Connect (OSTI)

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

71

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

72

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

SciTech Connect (OSTI)

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

73

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

74

Adjustable, rapidly switching microfluidic gradient generation using focused travelling surface acoustic waves  

SciTech Connect (OSTI)

We demonstrate a simple device to generate chemical concentration gradients in a microfluidic channel using focused travelling surface acoustic waves (F-TSAW). A pair of curved interdigitated metal electrodes deposited on the surface of a piezoelectric (LiNbO{sub 3}) substrate disseminate high frequency sound waves when actuated by an alternating current source. The F-TSAW produces chaotic acoustic streaming flow upon its interaction with the fluid inside a microfluidic channel, which mixes confluent streams of chemicals in a controlled fashion for an adjustable and rapidly switching gradient generation.

Destgeer, Ghulam; Im, Sunghyuk; Hang Ha, Byung; Ho Jung, Jin; Ahmad Ansari, Mubashshir; Jin Sung, Hyung, E-mail: hjsung@kaist.ac.kr [Department of Mechanical Engineering, KAIST, 291 Daejak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

2014-01-13T23:59:59.000Z

75

Linear and nonlinear theories of a large-orbit gyrotron traveling wave amplifier  

SciTech Connect (OSTI)

The linear and nonlinear theories of large-orbit gyrotron traveling wave amplifiers (gyro-TWAs) have been developed based on the corresponding theories of small-orbit gyro-TWAs. The linear theory is in good agreement with the nonlinear theory in the small signal region of large-orbit gyro-TWAs. The phenomenon that most electrons move toward the axis of interaction circuit during the beam-wave interaction is observed and its potential effect on the design of large-orbit coaxial gyro-TWAs is emphasized.

Jiao Chongqing [Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing 102206 (China); Luo Jirun [Institute of Electronics, Chinese Academy of Sciences, Beijing 100080 (China)

2010-05-15T23:59:59.000Z

76

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

77

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

78

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

79

Using Travel Time Reliability Measures to Improve Regional Transportation Planning and URS Corporation  

E-Print Network [OSTI]

use travel time reliability in the following ways: 1) incorporate it as a system-wide goal; 2 reliability in the historical sense such that a distribution of travel times is examined, and specific, and reliability can make a significant difference in efficient use of the transportation system. Despite its

Bertini, Robert L.

80

Validating Predicted Rural Corridor Travel Times from an Automated License Plate Recognition System: Oregon's Frontier Project  

E-Print Network [OSTI]

: Oregon's Frontier Project Robert L. Bertini Department of Civil & Environmental Engineering Portland of a corridor travel time prediction system that uses automated license plate recognition­the Frontier Travel Time project. As part of the Frontier project, the Oregon Department of Transportation deployed a video

Bertini, Robert L.

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

Simulation studies on the standing and traveling wave thermoacoustic prime movers  

SciTech Connect (OSTI)

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

82

Field theory of a terahertz staggered double-grating arrays waveguide Cerenkov traveling wave amplifier  

SciTech Connect (OSTI)

Based on a rectilinear sheet electron beam propagating through the tunnel of a staggered double-grating arrays waveguide (SDGAW) slow-wave structure (SWS), a three dimensional field theory for describing the modes and the beam-wave interaction is presented, in which the higher order terms inside the grooves are retained. The fields' distribution and the conductivity losses are also calculated utilizing the theoretical model. With the optimized parameters of the SWS and the electron beam, a 1 THz SDGAW Cerenkov traveling wave amplifier may obtain a moderate net gain (the peak gain is 12.7?dB/cm) and an ultra 3?dB wideband (0.19?THz) considering the serious Ohmic losses. The theoretical results have been compared with those calculated by 3D HFSS code and CST STUDIO particle-in-cell simulations.

Xie, Wenqiu; He, Fangming [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China) [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Wang, Zicheng; Luo, Jirun; Zhao, Ding; Liu, Qinglun [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)] [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)

2014-04-15T23:59:59.000Z

83

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

84

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-dependent travel speeds, hard time windows, andcapacityconstraints.ThiscreatesanewtypeofVRP,theemissions vehicle routing problem (EVRP). BACKGROUND AND LITERATURE REVIEW There is extensive literature related to vehicle

Bertini, Robert L.

85

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

SciTech Connect (OSTI)

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

86

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

87

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

SciTech Connect (OSTI)

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

Sources, sinks and holes in a one-dimensional traveling wave convection experiment  

E-Print Network [OSTI]

We study dynamical behavior of local structures, such as sources and holes, in traveling wave patterns in a very long (2 m) heated wire convection experiment. The {\\em sources} undergo a transition from stable coherent behavior to erratic behavior when the driving parameter $\\epsilon$ is {\\em decreased}. This transition, as well as the scaling of the average source width in the erratic regime, are both qualitatively and quantitatively in accord with earlier theoretical predictions. We also present new results for the {\\em holes} sent out by the erratic sources.

Luc Pastur; Mark-Tiele Westra; Daniel Snouck; Willem van de Water; Martin van Hecke; Cornelis Storm; Wim van Saarloos

2003-01-29T23:59:59.000Z

89

Beyond Corridor Reliability Measures: Analysis of Freeway Travel Time Reliability at the1 Segment Level for Hotspot Identification2  

E-Print Network [OSTI]

Beyond Corridor Reliability Measures: Analysis of Freeway Travel Time Reliability at the1 Segment and particularly1 freeways. However, it has become evident that travel time reliability, taking into account at the directional corridor level for planning4 purposes and analyze the ways in which travel time reliability can

Bertini, Robert L.

90

Time Travel: Why It May Not Pay to Work Out All the Kinks  

E-Print Network [OSTI]

curves which allow for "time travel" of a certain kind. In such mod- els, a massive particle may both indeed fails at this point. Consider a future directed timelike curve : I M. The scalar acceler- ation

Manchak, John

91

Time symmetry in wave function collapse models  

E-Print Network [OSTI]

A framework for wave function collapse models that is symmetric under time reversal is presented. Within this framework there are equivalent pictures of collapsing wave functions evolving in both time directions. The backwards-in-time Born rule can be broken by an initial condition on the Universe resulting in asymmetric behaviour. Similarly the forwards-in-time Born rule can in principle be broken by a final condition on the Universe.

Daniel Bedingham

2015-02-25T23:59:59.000Z

92

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

93

Low-order-mode harmonic multiplying gyrotron traveling-wave amplifier in W band  

SciTech Connect (OSTI)

Harmonic multiplying gyrotron traveling-wave amplifiers (gyro-TWAs) allow for magnetic field reduction and frequency multiplication. To avoid absolute instabilities, this work proposes a W-band harmonic multiplying gyro-TWA operating at low-order modes. By amplifying a fundamental harmonic TE{sub 11} drive wave, the second harmonic component of the beam current initiates a TE{sub 21} wave to be amplified. Absolute instabilities in the gyro-TWA are suppressed by shortening the interaction circuit and increasing wall losses. Simulation results reveal that compared with Ka-band gyro-TWTs, the lower wall losses effectively suppress absolute instabilities in the W-band gyro-TWA. However, a global reflective oscillation occurs as the wall losses decrease. Increasing the length or resistivity of the lossy section can reduce the feedback of the oscillation to stabilize the amplifier. The W-band harmonic multiplying gyro-TWA is predicted to yield a peak output power of 111 kW at 98 GHz with an efficiency of 25%, a saturated gain of 26 dB, and a bandwidth of 1.6 GHz for a 60 kV, 7.5 A electron beam with an axial velocity spread of 8%.

Yeh, Y. S.; Chen, C. H.; Yang, S. J.; Lai, C. H.; Lin, T. Y.; Lo, Y. C.; Hong, J. W. [Department of Electro-Optical Engineering, Southern Taiwan University, Tainan, Taiwan (China); Hung, C. L. [Department of Communication Engineering, National Penghu University of Science and Technology, Penghu, Taiwan (China); Chang, T. H. [Department of Physics, National Tsing Hua University, Hsinchu, Taiwan (China)

2012-09-15T23:59:59.000Z

94

Linear theory of large-orbit gyrotron traveling wave amplifiers with misaligned electron beam  

SciTech Connect (OSTI)

A linear theory of large-orbit gyrotron traveling wave amplifiers (gyro-TWAs), which can be applied to analyze the effect of electron beam misalignment, is developed by specializing the corresponding theory of small-orbit gyro-TWAs. The linear theory is validated by comparing with a nonlinear theory. Numerical results show that beam misalignment can reduce linear gain and amplification bandwidth of large-orbit gyro-TWAs and increase the starting length of large-orbit gyro-BWOs for modes in accordance with the mode-selective condition. In addition, beam misalignment can also break the limitation of mode-selective condition and make the instability problem more complex.

Jiao Chongqing [Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing 102206 (China); Luo Jirun [Institute of Electronics, Chinese Academy of Sciences, Beijing 100080 (China)

2010-11-15T23:59:59.000Z

95

Assessment of Smolt Condition for Travel Time Analysis Project, 1987-1997 Project Review.  

SciTech Connect (OSTI)

The assessment of Smolt Condition for Travel Time Analysis Project (Bonneville Power Administration Project 87-401) monitored attributes of salmonid smolt physiology in the Columbia and Snake River basins from 1987 to 1997, under the Northwest Power Planning Council Fish and Wildlife Program, in cooperation with the Smolt Monitoring Program of the Fish Passage Center. The primary goal of the project was to investigate the physiological development of juvenile salmonids related to migration rates. The assumption was made that the level of smolt development, interacting with environmental factos such as flow, would be reflected in travel times. The Fish Passage Center applied the physiological measurements of smolt condition to Water Budget management, to regulate flows so as to decrease travel time and increase survival.

Schrock, Robin M.; Hans, Karen M.; Beeman, John W. [US Geological Survey, Western Fisheries Research Center, Columbia River Research Laboratory, Cook, WA

1997-12-01T23:59:59.000Z

96

Time travel in the virtualized past: cheap fares and first class seats Liuba Shrira  

E-Print Network [OSTI]

University rshaull@cs.brandeis.edu 1 Abstract "Time travel" in the storage system is accessing past stor- age in the storage system at which past state virtualization could occur. How do we choose? We think that past state virtualization should occur at a high storage system buffer manager level, such as database buffer manager

Shrira, Liuba

97

Dynamically Predicting Corridor Travel Time Under Incident Conditions Using a Neural Network Approach  

E-Print Network [OSTI]

into the ANN model development, despite that incident might be a major source of prediction degradations. Additionally, directly deriving corridor travel times in a one-step manner raises some intractable problems, such as pairing input-target data, which have...

Zeng, Xiaosi

2011-02-22T23:59:59.000Z

98

Validating Predicted Rural Corridor Travel Times from an Automated License Plate Recognition System: Oregon's Frontier Project  

E-Print Network [OSTI]

: Oregon's Frontier Project Robert L. Bertini Department of Civil & Environmental Engineering Portland recognition­the Frontier Travel Time project. As part of the Frontier project, the Oregon Department, Utah, and Oregon) have formed the Frontier pooled-fund study which has implemented and tested ITS

Bertini, Robert L.

99

Validating Predicted Rural Corridor Travel Times from an Automated License Plate Recognition System: Oregon's Frontier  

E-Print Network [OSTI]

: Oregon's Frontier Project Robert L. Bertini, Matthew Lasky, and Christopher M. Monsere Abstract automated license plate recognition­the Frontier Travel Time project. As part of the Frontier project, Montana, Wyoming, Texas, Washington, Utah, and Oregon) have formed the Frontier pooled-fund study which

Bertini, Robert L.

100

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

SciTech Connect (OSTI)

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

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.


101

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

SciTech Connect (OSTI)

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

102

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

103

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

104

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

105

Mixed-domain performance model of the piezoelectric traveling-wave motor and the development of a two-sided device  

E-Print Network [OSTI]

In recognition of the growing consideration of piezoelectric traveling-wave motors as suitable replacements for small-scale electromagnetic motors, the present work addresses two parallel objectives: (1) to develop an ...

Glenn, Timothy Scott, 1971-

2002-01-01T23:59:59.000Z

106

Gravity Wave Turbulence in Wave Tanks: Space and Time Statistics Sergei Lukaschuk,1,* Sergey Nazarenko,2  

E-Print Network [OSTI]

Gravity Wave Turbulence in Wave Tanks: Space and Time Statistics Sergei Lukaschuk,1,* Sergey the first simultaneous space-time measurements for gravity wave turbulence in a large laboratory flume. We found that the slopes of k and ! wave spectra depend on wave intensity. This cannot be explained by any

Nazarenko, Sergey

107

Bifurcations of nonlinear ion acoustic travelling waves in the frame of a Zakharov-Kuznetsov equation in magnetized plasma with a kappa distributed electron  

SciTech Connect (OSTI)

Bifurcations of nonlinear propagation of ion acoustic waves (IAWs) in a magnetized plasma whose constituents are cold ions and kappa distributed electron are investigated using a two component plasma model. The standard reductive perturbation technique is used to derive the Zakharov-Kuznetsov (ZK) equation for IAWs. By using the bifurcation theory of planar dynamical systems to this ZK equation, the existence of solitary wave solutions and periodic travelling wave solutions is established. All exact explicit solutions of these travelling waves are determined. The results may have relevance in dense space plasmas.

Kumar Samanta, Utpal [Department of Mathematics, Bankura Christian College, Bankura 722101 (India) [Department of Mathematics, Bankura Christian College, Bankura 722101 (India); Department of Mathematics, Visva Bharati University, Santinekatan 731235 (India); Saha, Asit [Department of Mathematics, Sikkim Manipal Institute of Technology, Majitar, Rangpo, East-Sikkim 737136 (India)] [Department of Mathematics, Sikkim Manipal Institute of Technology, Majitar, Rangpo, East-Sikkim 737136 (India); Chatterjee, Prasanta [Department of Mathematics, Visva Bharati University, Santinekatan 731235 (India)] [Department of Mathematics, Visva Bharati University, Santinekatan 731235 (India)

2013-05-15T23:59:59.000Z

108

0.22 THz wideband sheet electron beam traveling wave tube amplifier: Cold test measurements and beam wave interaction analysis  

SciTech Connect (OSTI)

In this paper, we describe micro-fabrication, RF measurements, and particle-in-cell (PIC) simulation modeling analysis of the 0.22 THz double-vane half period staggered traveling wave tube amplifier (TWTA) circuit. The TWTA slow wave structure comprised of two sections separated by two sever ports loaded by loss material, with integrated broadband input/output couplers. The micro-metallic structures were fabricated using nano-CNC milling and diffusion bonded in a three layer process. The 3D optical microscopy and SEM analysis showed that the fabrication error was within 2-3 {mu}m and surface roughness was measured within 30-50 nm. The RF measurements were conducted with an Agilent PNA-X network analyzer employing WR5.1 T/R modules with a frequency range of 178-228 GHz. The in-band insertion loss (S{sub 21}) for both the short section and long section (separated by a sever) was measured as {approx}-5 dB while the return loss was generally around {approx}-15 dB or better. The measurements matched well with the S-matrix simulation analysis that predicted a 3 dB bandwidth of {approx}45 GHz with an operating frequency at 220 GHz. However, the measured S{sub 21} was {approx}3 dB less than the design values, and is attributed to surface roughness and alignment issues. The confirmation measurements were conducted over the full frequency band up to 270 GHz employing a backward wave oscillator (BWO) scalar network analyzer setup employing a BWO in the frequency range 190 GHz-270 GHz. PIC simulations were conducted for the realistic TWT output power performance analysis with incorporation of corner radius of 127 {mu}m, which is inevitably induced by nano-machining. Furthermore, the S{sub 21} value in both sections of the TWT structure was reduced to correspond to the measurements by using a degraded conductivity of 10% International Annealed Copper Standard. At 220 GHz, for an elliptic sheet electron beam of 20 kV and 0.25 A, the average output power of the tube was predicted to be reduced from 90 W (for ideal conductivity/design S-parameters) to 70 W (for the measured S-parameters/inferred conductivity) for an average input power of 50 mW. The gain of the tube remains reasonable: {approx}31.4 dB with an electronic efficiency of {approx}1.4%. The same analysis was also conducted for several frequencies between 190 GHz-260 GHz. This detailed realistic PIC analysis demonstrated that this nano-machined TWT circuit has slightly reduced S-parameters and output power from design, but within an acceptable range and still have promising output power, gain, and band width as required. Thus, we expect to meet the specifications of 1000 W-GHz for the darpa program goals.

Baig, Anisullah; Gamzina, Diana; Barchfeld, Robert; Domier, Calvin; Barnett, Larry R.; Luhmann, Neville C. Jr. [Department of Electrical and Computer Engineering, University of California, Davis, California 95616 (United States)

2012-09-15T23:59:59.000Z

109

Acceleration time scale at ultrarelativistic shock waves  

E-Print Network [OSTI]

The first-order cosmic ray acceleration at ultrarelativistic shocks is investigated using the Monte Carlo method. We apply a method of discrete particle momentum scattering as a model of particle pitch angle diffusion to reproduce highly anisotropic conditions at the shock wave. Shocks with Lorentz factors $\\gamma$ up to 320 and varying magnetic field inclinations $\\psi$ are considered. Values of diffusion coefficients upstream in the point where energy spectral indices stabilize to the limit 2.2 were calculated. The obtained acceleration time does not depend on shock conditions.

J. Bednarz

1998-08-26T23:59:59.000Z

110

TIME-PERIODIC SOUND WAVE PROPAGATION COMPRESSIBLE EULER EQUATIONS  

E-Print Network [OSTI]

A PARADIGM FOR TIME-PERIODIC SOUND WAVE PROPAGATION IN THE COMPRESSIBLE EULER EQUATIONS BLAKE consistent with time-periodic sound wave propagation in the 3 Ã? 3 nonlinear compressible Euler equations description of shock-free waves that propagate through an oscillating entropy field without breaking or dis

111

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

SciTech Connect (OSTI)

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

112

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

113

Generation and growth rates of nonlinear distortions in a traveling wave tube John G. Wohlbier, Ian Dobson, and John H. Booske  

E-Print Network [OSTI]

Generation and growth rates of nonlinear distortions in a traveling wave tube John G. Wo the generation of intermodulation frequencies and calculate their growth rates. The model describes the evolution rates is derived and compared to simulation results. DOI: 10.1103/PhysRevE.66.056504 PACS number s : 52

Dobson, Ian

114

HUMAN BRAIN IMAGING AT 9.4 TESLA USING A COMBINATION OF TRAVELING WAVE EXCITATION WITH A 15-CHANNEL RECEIVE-ONLY ARRAY  

E-Print Network [OSTI]

HUMAN BRAIN IMAGING AT 9.4 TESLA USING A COMBINATION OF TRAVELING WAVE EXCITATION WITH A 15-CHANNEL is a successful setup for routine human brain imaging at 7 Tesla. For reception, the use of multiple surface coils multichannel transmit coils. At 9.4 Tesla, however, the even shorter RF wavelength in tissue causes the B1

115

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

116

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

SciTech Connect (OSTI)

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

Comparison of vehicle travel times and measurement techniques along the I-35 corridor in San Antonio, Texas  

E-Print Network [OSTI]

collected for three days and compared to travel times derived from loop detector data along the 1-35 corridor in San Antonio, Texas. The loop detector data were made available through TransGuide's Internet site. TransGuide is the traffic management center...

Ferrier, Pete James

1999-01-01T23:59:59.000Z

118

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

E-Print Network [OSTI]

wave propagation in MIS waveguide. Krowne and Tait numerically analyzed a voltage-variable GaAs distributed Schottky barrier phase shifter and a transmission line over a Si bipolar junction [6]. In order to find the propagation constant, a transport... by attaching distributed p-i-n diodes on the side surfaces of the silicon rod. By introducing forward bias, which makes the i-region conductive, the guide wavelength in the silicon rod is changed because of the moving up effect of the conductor...

Shin, Chang-Seok

2012-06-07T23:59:59.000Z

119

Multi-time wave functions for quantum field theory  

SciTech Connect (OSTI)

Multi-time wave functions such as ?(t{sub 1},x{sub 1},…,t{sub N},x{sub N}) have one time variable t{sub j} for each particle. This type of wave function arises as a relativistic generalization of the wave function ?(t,x{sub 1},…,x{sub N}) of non-relativistic quantum mechanics. We show here how a quantum field theory can be formulated in terms of multi-time wave functions. We mainly consider a particular quantum field theory that features particle creation and annihilation. Starting from the particle–position representation of state vectors in Fock space, we introduce multi-time wave functions with a variable number of time variables, set up multi-time evolution equations, and show that they are consistent. Moreover, we discuss the relation of the multi-time wave function to two other representations, the Tomonaga–Schwinger representation and the Heisenberg picture in terms of operator-valued fields on space–time. In a certain sense and under natural assumptions, we find that all three representations are equivalent; yet, we point out that the multi-time formulation has several technical and conceptual advantages. -- Highlights: •Multi-time wave functions are manifestly Lorentz-covariant objects. •We develop consistent multi-time equations with interaction for quantum field theory. •We discuss in detail a particular model with particle creation and annihilation. •We show how multi-time wave functions are related to the Tomonaga–Schwinger approach. •We show that they have a simple representation in terms of operator valued fields.

Petrat, Sören, E-mail: petrat@math.lmu.de [Mathematisches Institut, Ludwig-Maximilians-Universität, Theresienstr. 39, 80333 München (Germany); Tumulka, Roderich, E-mail: tumulka@math.rutgers.edu [Department of Mathematics, Rutgers University, 110 Frelinghuysen Road, Piscataway, NJ 08854-8019 (United States)

2014-06-15T23:59:59.000Z

120

EddyViscosity Time Reversing Waves a Dissipative Environment  

E-Print Network [OSTI]

where linear shallow water speed is given o o . The kinematic viscosity denoted parameter ratio been shown [6] nonlinear (inviscid) shallow water waves pres­ ence a random topography and alsoEddyViscosity Time Reversing Waves a Dissipative Environment Josselin Garnier Laboratoire

Garnier, Josselin

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

Uncertainty and Sensitivity of Contaminant Travel Times from the Upgradient Nevada Test Site to the Yucca Mountain Area  

SciTech Connect (OSTI)

Yucca Mountain (YM), Nevada, has been proposed by the U.S. Department of Energy as the nation’s first permanent geologic repository for spent nuclear fuel and highlevel radioactive waste. In this study, the potential for groundwater advective pathways from underground nuclear testing areas on the Nevada Test Site (NTS) to intercept the subsurface of the proposed land withdrawal area for the repository is investigated. The timeframe for advective travel and its uncertainty for possible radionuclide movement along these flow pathways is estimated as a result of effective-porosity value uncertainty for the hydrogeologic units (HGUs) along the flow paths. Furthermore, sensitivity analysis is conducted to determine the most influential HGUs on the advective radionuclide travel times from the NTS to the YM area. Groundwater pathways are obtained using the particle tracking package MODPATH and flow results from the Death Valley regional groundwater flow system (DVRFS) model developed by the U.S. Geological Survey (USGS). Effectiveporosity values for HGUs along these pathways are one of several parameters that determine possible radionuclide travel times between the NTS and proposed YM withdrawal areas. Values and uncertainties of HGU porosities are quantified through evaluation of existing site effective-porosity data and expert professional judgment and are incorporated in the model through Monte Carlo simulations to estimate mean travel times and uncertainties. The simulations are based on two steady-state flow scenarios, the pre-pumping (the initial stress period of the DVRFS model), and the 1998 pumping (assuming steady-state conditions resulting from pumping in the last stress period of the DVRFS model) scenarios for the purpose of long-term prediction and monitoring. The pumping scenario accounts for groundwater withdrawal activities in the Amargosa Desert and other areas downgradient of YM. Considering each detonation in a clustered region around Pahute Mesa (in the NTS operational areas 18, 19, 20, and 30) under the water table as a particle, those particles from the saturated zone detonations were tracked forward using MODPATH to identify hydraulically downgradient groundwater discharge zones and to determine the particles from which detonations will intercept the proposed YM withdrawal area. Out of the 71 detonations in the saturated zone, the flowpaths from 23 of the 71 detonations will intercept the proposed YM withdrawal area under the pre-pumping scenario. For the 1998 pumping scenario, the flowpaths from 55 of the 71 detonations will intercept the proposed YM withdrawal area. Three different effective-porosity data sets compiled in support of regional models of groundwater flow and contaminant transport developed for the NTS and the proposed YM repository are used. The results illustrate that mean minimum travel time from underground nuclear testing areas on the NTS to the proposed YM repository area can vary from just over 700 to nearly 700,000 years, depending on the locations of the underground detonations, the pumping scenarios considered, and the effective-porosity value distributions used. Groundwater pumping scenarios are found to significantly impact minimum particle travel time from the NTS to the YM area by altering flowpath geometry. Pumping also attracts many more additional groundwater flowpaths from the NTS to the YM area. The sensitivity analysis further illustrates that for both the pre-pumping and 1998 pumping scenarios, the uncertainties in effective-porosity values for five of the 27 HGUs considered account for well over 90 percent of the effective-porosity-related travel time uncertainties for the flowpaths having the shortest mean travel times to YM.

J. Zhu; K. Pohlmann; J. Chapman; C. Russell; R.W.H. Carroll; D. Shafer

2009-09-10T23:59:59.000Z

122

Time propagation of constrained coupled Gaussian wave packets  

E-Print Network [OSTI]

The dynamics of quantum systems can be approximated by the time propagation of Gaussian wave packets. Applying a time dependent variational principle, the time evolution of the parameters of the coupled Gaussian wave packets can be calculated from a set of ordinary differential equations. Unfortunately, the set of equations is ill-behaved in most practical applications, depending on the number of propagated Gaussian wave packets, and methods for regularization are needed. We present a general method for regularization based on applying adequate nonholonomic inequality constraints to the evolution of the parameters, keeping the equations of motion well-behaved. The power of the method is demonstrated for a non-integrable system with two degrees of freedom.

T. Fabcic; J. Main; G. Wunner

2007-11-14T23:59:59.000Z

123

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

SciTech Connect (OSTI)

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

124

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

125

Travel Codes Traveler Is Employee  

E-Print Network [OSTI]

Travel Codes Traveler Is Employee: 64100-Domestic Travel 64150-Mileage 64200-International Travel Supplies & Expense Codes 71410-Office Supplies 71430-Lab/Research Supplies (dollar value of each item less Charges Equipment Codes 84320-Equipment (non-computer & peripherals) with a cost of $5,000.00 or more per

Arnold, Jonathan

126

Most fish have a forward undulatory swimming mechanism that involves a kinematic propulsive wave travelling down the  

E-Print Network [OSTI]

Most fish have a forward undulatory swimming mechanism that involves a kinematic propulsive wave backwards in a similar way. We compared the kinematics (wave speed, cycle frequency, amplitude, local in the direction opposite to that of swimming. We observe two major kinematic differences. First, the slope of wave

D'Août, Kristiaan

127

The wave equation on static singular space-times  

E-Print Network [OSTI]

The first part of my thesis lays the foundations to generalized Lorentz geometry. The basic algebraic structure of finite-dimensional modules over the ring of generalized numbers is investigated. The motivation for this part of my thesis evolved from the main topic, the wave equation on singular space-times. The second and main part of my thesis is devoted to establishing a local existence and uniqueness theorem for the wave equation on singular space-times. The singular Lorentz metric subject to our discussion is modeled within the special algebra on manifolds in the sense of Colombeau. Inspired by an approach to generalized hyperbolicity of conical-space times due to Vickers and Wilson, we succeed in establishing certain energy estimates, which by a further elaborated equivalence of energy integrals and Sobolev norms allow us to prove existence and uniqueness of local generalized solutions of the wave equation with respect to a wide class of generalized metrics. The third part of my thesis treats three different point value resp. uniqueness questions in algebras of generalized functions

Eberhard Mayerhofer

2008-02-12T23:59:59.000Z

128

Reverse Time Migration for Extended Obstacles: Electromagnetic Waves  

E-Print Network [OSTI]

We propose a new single frequency reverse time migration (RTM) algorithm for imaging extended targets using electromagnetic waves. The imaging functional is defined as the imaginary part of the cross-correlation of the Green function for Helmholtz equation and the back-propagated electromagnetic field. The resolution of our RTM method for both penetrable and non-penetrable extended targets is studied by virtue of Helmholtz-Kirchhoff identity for the time-harmonic Maxwell equation. The analysis implies that our imaging functional is always positive and thus may have better stability properties. Numerical examples are provided to demonstrate the powerful imaging quality and confirm our theoretical results.

Junqing Chen; Zhiming Chen; Guanghui Huang

2014-06-10T23:59:59.000Z

129

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

130

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

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

131

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

132

Time reversed wave propagation experiments in chaotic micro-structured cavities  

E-Print Network [OSTI]

Time reversed wave propagation experiments in chaotic micro-structured cavities Rudolf Sprik a Chimie Industrielles, Paris, France Abstract The elastic wave propagation in strongly scattering solid; Elastic wave propagation The propagation of waves through systems with strong scatterers is ubiquitous

Sprik, Rudolf

133

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

134

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

135

Theoretical Population Biology 73 (2008) 2446 The traveling-wave approach to asexual evolution: Muller's ratchet and  

E-Print Network [OSTI]

: Muller's ratchet and speed of adaptation Igor M. Rouzinea,Ã, E´ ric Brunetb , Claus O. Wilkec-wave theory to derive expressions for the rate of accumulation of deleterious mutations under Muller's ratchet the highest-fitness class (the stochastic edge) for both Muller's ratchet and adaptive evolution

Brunet, Eric

2008-01-01T23:59:59.000Z

136

Jefferson Lab Travel - Training  

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

137

TRAVEL REIMBURSEMENTS Basic Travel Guidelines  

E-Print Network [OSTI]

on supervised group trips or co-travelers sharing a room Private Car Mileage Shortest distance for travel Car Rentals You can rent up to an intermediate size car - additional insurance is not reimbursable for receipts, but may be submitted in addition to show proof of payment Car rental receipts showing payment

El Karoui, Noureddine

138

The stability of Killing-Cauchy horizons in colliding plane wave space-times  

E-Print Network [OSTI]

It is confirmed rigorously that the Killing-Cauchy horizons, which sometimes occur in space-times representing the collision and subsequent interaction of plane gravitational waves in a Minkowski background, are unstable with respect to bounded perturbations of the initial waves, at least for the case in which the initial waves have constant aligned polarizations.

J. B. Griffiths

2005-01-05T23:59:59.000Z

139

Catching the Next Big Wave: Are the Observed Behavioral Dynamics of the Baby Boomers Forcing Us to Rethink Regional Travel Demand Models?  

E-Print Network [OSTI]

travel diary Number of trips car sharing on the first day ofdiary Number of trips car sharing on the second day of the

Goulias, Konstadinos G; Blain, Larry; Kilgren, Neil; Michalowski, Timothy; Murakami, Elaine

2007-01-01T23:59:59.000Z

140

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

SciTech Connect (OSTI)

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

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

Precomputed Wave Simulation for Real-Time Sound Propagation of Dynamic Sources in Complex Scenes  

E-Print Network [OSTI]

Precomputed Wave Simulation for Real-Time Sound Propagation of Dynamic Sources in Complex Scenes of North Carolina at Chapel Hill Abstract We present a method for real-time sound propagation that captures all wave effects, including diffraction and reverberation, for multi- ple moving sources and a moving

North Carolina at Chapel Hill, University of

142

Reconstruction of nonstationary sound fields based on time domain plane wave superposition method  

E-Print Network [OSTI]

Reconstruction of nonstationary sound fields based on time domain plane wave superposition method X.-Z. Zhanga , J.-H. Thomasb , C.-X. Bia and J.-C. Pascalb a Institute of Sound and Vibration Research, Hefei of the Acoustics 2012 Nantes Conference 23-27 April 2012, Nantes, France 1811 #12;A time-domain plane wave

Boyer, Edmond

143

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

144

Simulation-based evaluation of Advanced Traveler Information Services (ATIS)  

E-Print Network [OSTI]

Drivers using information from an Advanced Traveler Information System (ATIS) could potentially make better travel decisions to reduce travel time and increase trip reliability, thereby benefiting both guided drivers as ...

Florian, Daniel George

2004-01-01T23:59:59.000Z

145

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

146

XXII ICTAM, 2529 August 2008, Adelaide, Australia SPACE-TIME MEASUREMENTS OF BREAKING WAVE KINEMATICS  

E-Print Network [OSTI]

with light intensity. WAVE KINEMATICS Phase average vorticity In order to have a statistical evolutionXXII ICTAM, 25­29 August 2008, Adelaide, Australia SPACE-TIME MEASUREMENTS OF BREAKING WAVE KINEMATICS AND VOID FRACTION IN THE SURF ZONE Olivier Kimmoun1 , 2 Hubert Branger1 1IRPHE, CNRS, Aix

Paris-Sud XI, Université de

147

Timing Recovery for the Magnetic Recording Channel Using the Wave Difference Method  

E-Print Network [OSTI]

and Paul J. Hurst Abstract-- Timing recovery using the wave difference method (WDM) is proposed for use performance may be improved when channel SNR is low [3]. However, these schemes used continuous-time filters ARCHITECTURE Much previous work [3], [5]­[7] presents timing recovery based on timing tone extraction using

Hurst, Paul J.

148

Travel Guide Travel Mode Options  

E-Print Network [OSTI]

operator in Preston city. Go to www.stagecoachbus.co.uk Car Sharing If you need to travel by car you can and meet new people by car sharing. Register your journey at www.uclan.ac.uk/car-share UCLan staff and students can search for a match in the staff and students private car sharing groups at www.uclan.ac.uk/car-share

Crowther, Paul

149

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

150

Travel Reimbursement  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation Desert Southwest RegionatSearchScheduled System BurstLongTitan Titan isTravel Reimbursement

151

Wave Packet with a Resonance I just wanted to tell you how one can study the time evolution of the wave  

E-Print Network [OSTI]

Wave Packet with a Resonance I just wanted to tell you how one can study the time evolution of the wave packet around the resonance region quite convincingly. This in my mind is the most difficult can extract. The wave function we obtained earlier in the lecture note is (r) rR0(r) = sin(ka+0) sin

Murayama, Hitoshi

152

Seismic wave propagation in thinly-layered media with steep reflectors  

SciTech Connect (OSTI)

Seismic waves reflected from steep reflectors in the earth`s subsurface spend a significant amount of time travelling more or less horizontally. Therefore, accurate imaging of steep geologic structure requires knowledge of the behavior of these horizontally propagating waves. In particular, the effect of tunneling on seismic waves propagating in thinly-layered media must be understood. I describe a method for modeling seismic waves traveling in thinly-layered media. This method, a frequency-wavenumber finite-difference scheme coupled with the Born approximation, is useful in studying seismic waves reflected from steep geologic structures.

Deng, H.L.

1992-05-01T23:59:59.000Z

153

Seismic wave propagation in thinly-layered media with steep reflectors  

SciTech Connect (OSTI)

Seismic waves reflected from steep reflectors in the earth's subsurface spend a significant amount of time travelling more or less horizontally. Therefore, accurate imaging of steep geologic structure requires knowledge of the behavior of these horizontally propagating waves. In particular, the effect of tunneling on seismic waves propagating in thinly-layered media must be understood. I describe a method for modeling seismic waves traveling in thinly-layered media. This method, a frequency-wavenumber finite-difference scheme coupled with the Born approximation, is useful in studying seismic waves reflected from steep geologic structures.

Deng, H.L.

1992-05-01T23:59:59.000Z

154

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

SciTech Connect (OSTI)

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

155

A 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 quasi-normal mode oscillations in their parent neutron star that couple to gravitational wave emission. In August 2006, a timing glitch was observed in the radio emission of PSR B0833-45, the Vela pulsar. At the time of the glitch, the two co-located Hanford gravitational wave detectors of the Laser Interferometer Gravitational-wave observatory (LIGO) were operational and taking data as part of the fifth LIGO science run (S5). We present the first direct search for the gravitational wave emission associated with oscillations of the fundamental quadrupole mode excited by a pulsar timing glitch. No gravitational wave detection candidate was found. We place Bayesian 90% confidence upper limits of 6.3e-21 to 1.4e-20 on the peak intrinsic strain amplitude of gravitational wave ring-down signals, depending on which spherical harmonic mode is excited. The corresponding range of energy upper limits is 5.0e44 to 1.3e45 erg.

The LIGO Scientific Collaboration; J. Abadie; B. P. Abbott; R. Abbott; R. Adhikari; P. Ajith; B. Allen; G. Allen; E. Amador Ceron; R. S. Amin; S. B. Anderson; W. G. Anderson; M. A. Arain; M. Araya; Y. Aso; S. Aston; P. Aufmuth; C. Aulbert; S. Babak; P. Baker; S. Ballmer; D. Barker; B. Barr; P. Barriga; L. Barsotti; M. A. Barton; I. Bartos; R. Bassiri; M. Bastarrika; B. Behnke; M. Benacquista; M. F. Bennett; J. Betzwieser; P. T. Beyersdorf; I. A. Bilenko; G. Billingsley; R. Biswas; E. Black; J. K. Blackburn; L. Blackburn; D. Blair; B. Bland; O. Bock; T. P. Bodiya; R. Bondarescu; R. Bork; M. Born; S. Bose; P. R. Brady; V. B. Braginsky; J. E. Brau; J. Breyer; D. O. Bridges; M. Brinkmann; M. Britzger; A. F. Brooks; D. A. Brown; S. Buchner; A. Bullington; A. Buonanno; O. Burmeister; R. L. Byer; L. Cadonati; J. Cain; J. B. Camp; J. Cannizzo; K. C. Cannon; J. Cao; C. Capano; L. Cardenas; S. Caudill; M. Cavaglià; C. Cepeda; T. Chalermsongsak; E. Chalkley; P. Charlton; S. Chatterji; S. Chelkowski; Y. Chen; N. Christensen; S. S. Y. Chua; C. T. Y. Chung; D. Clark; J. Clark; J. H. Clayton; R. Conte; D. Cook; T. R. C. Corbitt; N. Cornish; D. Coward; D. C. Coyne; J. D. E. Creighton; T. D. Creighton; A. M. Cruise; R. M. Culter; A. Cumming; L. Cunningham; K. Dahl; S. L. Danilishin; K. Danzmann; B. Daudert; G. Davies; E. J. Daw; T. Dayanga; D. DeBra; J. Degallaix; V. Dergachev; R. DeSalvo; S. Dhurandhar; M. Díaz; F. Donovan; K. L. Dooley; E. E. Doomes; R. W. P. Drever; J. Driggers; J. Dueck; I. Duke; J. -C. Dumas; M. Edgar; M. Edwards; A. Effler; P. Ehrens; T. Etzel; M. Evans; T. Evans; S. Fairhurst; Y. Faltas; Y. Fan; D. Fazi; H. Fehrmann; L. S. Finn; K. Flasch; S. Foley; C. Forrest; N. Fotopoulos; M. Frede; M. Frei; Z. Frei; A. Freise; R. Frey; T. T. Fricke; D. Friedrich; P. Fritschel; V. V. Frolov; P. Fulda; M. Fyffe; J. A. Garofoli; S. Ghosh; J. A. Giaime; S. Giampanis; K. D. Giardina; E. Goetz; L. M. Goggin; G. González; S. Goßler; A. Grant; S. Gras; C. Gray; R. J. S. Greenhalgh; A. M. Gretarsson; R. Grosso; H. Grote; S. Grunewald; E. K. Gustafson; R. Gustafson; B. Hage; J. M. Hallam; D. Hammer; G. D. Hammond; C. Hanna; J. Hanson; J. Harms; G. M. Harry; I. W. Harry; E. D. Harstad; K. Haughian; K. Hayama; T. Hayler; J. Heefner; I. S. Heng; A. Heptonstall; M. Hewitson; S. Hild; E. Hirose; D. Hoak; K. A. Hodge; K. Holt; D. J. Hosken; J. Hough; E. Howell; D. Hoyland; B. Hughey; S. Husa; S. H. Huttner; D. R. Ingram; T. Isogai; A. Ivanov; W. W. Johnson; D. I. Jones; G. Jones; R. Jones; L. Ju; P. Kalmus; V. Kalogera; S. Kandhasamy; J. Kanner; E. Katsavounidis; K. Kawabe; S. Kawamura; F. Kawazoe; W. Kells; D. G. Keppel; A. Khalaidovski; F. Y. Khalili; R. Khan; E. Khazanov; H. Kim; P. J. King; J. S. Kissel; S. Klimenko; K. Kokeyama; V. Kondrashov; R. Kopparapu; S. Koranda; D. Kozak; V. Kringel; B. Krishnan; G. Kuehn; J. Kullman; R. Kumar; P. Kwee; P. K. Lam; M. Landry; M. Lang; B. Lantz; N. Lastzka; A. Lazzarini; P. Leaci; M. Lei; N. Leindecker; I. Leonor; H. Lin; P. E. Lindquist; T. B. Littenberg; N. A. Lockerbie; D. Lodhia; M. Lormand; P. Lu; M. Lubinski; A. Lucianetti; H. Lück; A. Lundgren; B. Machenschalk; M. MacInnis; M. Mageswaran; K. Mailand; C. Mak; I. Mandel; V. Mandic; S. Márka; Z. Márka; A. Markosyan; J. Markowitz; E. Maros; I. W. Martin; R. M. Martin; J. N. Marx; K. Mason; F. Matichard; L. Matone; R. A. Matzner; N. Mavalvala; R. McCarthy; D. E. McClelland; S. C. McGuire; G. McIntyre; D. J. A. McKechan; M. Mehmet; A. Melatos; A. C. Melissinos; G. Mendell; D. F. Menéndez; R. A. Mercer; L. Merrill; S. Meshkov; C. Messenger; M. S. Meyer; H. Miao; J. Miller; Y. Mino; S. Mitra; V. P. Mitrofanov; G. Mitselmakher; R. Mittleman; O. Miyakawa; B. Moe; S. D. Mohanty; S. R. P. Mohapatra; G. Moreno; K. Mors; K. Mossavi; C. MowLowry; G. Mueller; H. Müller-Ebhardt; S. Mukherjee; A. Mullavey; J. Munch; P. G. Murray; T. Nash; R. Nawrodt; J. Nelson; G. Newton; E. Nishida; A. Nishizawa; J. O'Dell; B. O'Reilly; R. O'Shaughnessy; E. Ochsner; G. H. Ogin; R. Oldenburg; D. J. Ottaway; R. S. Ottens; H. Overmier; B. J. Owen; A. Page; Y. Pan; C. Pankow; M. A. Papa; P. Patel; D. Pathak; M. Pedraza; L. Pekowsky; S. Penn; C. Peralta; A. Perreca; M. Pickenpack; I. M. Pinto; M. Pitkin; H. J. Pletsch; M. V. Plissi; F. Postiglione; M. Principe; R. Prix; L. Prokhorov; O. Puncken; V. Quetschke; F. J. Raab; D. S. Rabeling; H. Radkins; P. Raffai; Z. Raics; M. Rakhmanov; V. Raymond; C. M. Reed; T. Reed; H. Rehbein; S. Reid; D. H. Reitze; R. Riesen; K. Riles; P. Roberts; N. A. Robertson; C. Robinson; E. L. Robinson; S. Roddy; C. Röver; J. Rollins; J. D. Romano; J. H. Romie; S. Rowan; A. Rüdiger; K. Ryan; S. Sakata; L. Sammut; L. Sancho de la Jordana; V. Sandberg; V. Sannibale; L. Santamaría; G. Santostasi; S. Saraf; P. Sarin; B. S. Sathyaprakash; S. Sato; M. Satterthwaite; P. R. Saulson; R. Savage; R. Schilling

2010-11-05T23:59:59.000Z

156

Real-time fracture monitoring in Engineered Geothermal Systems with seismic waves  

SciTech Connect (OSTI)

As proposed, the main effort in this project is the development of software capable of performing real-time monitoring of micro-seismic activity recorded by an array of sensors deployed around an EGS. The main milestones are defined by the development of software to perform the following tasks: • Real-time micro-earthquake detection and location • Real-time detection of shear-wave splitting • Delayed-time inversion of shear-wave splitting These algorithms, which are discussed in detail in this report, make possible the automatic and real-time monitoring of subsurface fracture systems in geothermal fields from data collected by an array of seismic sensors. Shear wave splitting (SWS) is parameterized in terms of the polarization of the fast shear wave and the time delay between the fast and slow shear waves, which are automatically measured and stored. The measured parameters are then combined with previously measured SWS parameters at the same station and used to invert for the orientation (strike and dip) and intensity of cracks under that station. In addition, this grant allowed the collection of seismic data from several geothermal regions in the US (Coso) and Iceland (Hengill) to use in the development and testing of the software.

Jose A. Rial; Jonathan Lees

2009-03-31T23:59:59.000Z

157

Matter pulse carving: Manipulating quantum wave packets via time-dependent absorption  

E-Print Network [OSTI]

A pulse of matter waves may dramatically change its shape when traversing an absorbing barrier with time-dependent transparency. Here we show that this effect can be utilized for controlled manipulation of spatially-localized quantum states. In particular, in the context of atom-optics experiments, we explicitly demonstrate how the proposed approach can be used to generate spatially shifted, split, squeezed and cooled atomic wave packets. We expect our work to be useful in devising new interference experiments with atoms and molecules and, more generally, to enable new ways of coherent control of matter waves.

Goussev, Arseni

2015-01-01T23:59:59.000Z

158

Reverse Time Migration for Extended Obstacles: Acoustic Waves  

E-Print Network [OSTI]

We consider the resolution of the single frequency reverse time migration (RTM) method for extended targets without the assumption of the validation of geometric optics approximation. The resolution analysis, which applies in both penetrable and non-penetrable obstacles with sound soft or impedance boundary condition on the boundary of the obstacle, implies that the imaginary part of the cross-correlation imaging functional is always positive and thus may have better stability properties. Numerical experiments are included to illustrate the powerful imaging quality and to confirm our resolution results.

Junqing Chen; Zhiming Chen; Guanghui Huang

2014-06-10T23:59:59.000Z

159

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

160

Wave equations with non-commutative space and time  

E-Print Network [OSTI]

The behaviour of solutions to the partial differential equation $(D + \\lambda W)f_\\lambda = 0$ is discussed, where $D$ is a normal hyperbolic partial differential operator, or pre-normal hyperbolic operator, on $n$-dimensional Minkowski spacetime. The potential term $W$ is a $C_0^\\infty$ kernel operator which, in general, will be non-local in time, and $\\lambda$ is a complex parameter. A result is presented which states that there are unique advanced and retarded Green's operators for this partial differential equation if $|\\lambda|$ is small enough (and also for a larger set of $\\lambda$ values). Moreover, a scattering operator can be defined if the $\\lambda$ values admit advanced and retarded Green operators. In general, however, the Cauchy-problem will be ill-posed, and examples will be given to that effect. It will also be explained that potential terms arising from non-commutative products on function spaces can be approximated by $C_0^\\infty$ kernel operators and that, thereby, scattering by a non-commu...

Verch, Rainer

2015-01-01T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
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161

Majorana modes in time-reversal invariant s-wave topological superconductors  

E-Print Network [OSTI]

We present a time-reversal invariant s-wave superconductor supporting Majorana edge modes. The multi-band character of the model together with spin-orbit coupling are key to realizing such a topological superconductor. We characterize the topological phase diagram by using a partial Chern number sum, and show that the latter is physically related to the parity of the fermion number of the time-reversal invariant modes. By taking the self-consistency constraint on the s-wave pairing gap into account, we also establish the possibility of a direct topological superconductor-to-topological insulator quantum phase transition.

Shusa Deng; Lorenza Viola; Gerardo Ortiz

2012-01-19T23:59:59.000Z

162

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

163

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

164

AN EFFICIENT APPROXIMATION TO THE LIKELIHOOD FOR GRAVITATIONAL WAVE STOCHASTIC BACKGROUND DETECTION USING PULSAR TIMING DATA  

SciTech Connect (OSTI)

Direct detection of gravitational waves by pulsar timing arrays will become feasible over the next few years. In the low frequency regime (10{sup -7} Hz-10{sup -9} Hz), we expect that a superposition of gravitational waves from many sources will manifest itself as an isotropic stochastic gravitational wave background. Currently, a number of techniques exist to detect such a signal; however, many detection methods are computationally challenging. Here we introduce an approximation to the full likelihood function for a pulsar timing array that results in computational savings proportional to the square of the number of pulsars in the array. Through a series of simulations we show that the approximate likelihood function reproduces results obtained from the full likelihood function. We further show, both analytically and through simulations, that, on average, this approximate likelihood function gives unbiased parameter estimates for astrophysically realistic stochastic background amplitudes.

Ellis, J. A.; Siemens, X. [Center for Gravitation, Cosmology and Astrophysics, University of Wisconsin Milwaukee, Milwaukee, WI 53211 (United States); Van Haasteren, R. [Max-Planck-Institut fuer Gravitationphysik (Albert-Einstein-Institut), D-30167 Hanover (Germany)

2013-05-20T23:59:59.000Z

165

Weak energy condition violation and superluminal travel  

E-Print Network [OSTI]

Recent solutions to the Einstein Field Equations involving negative energy densities, i.e., matter violating the weak-energy-condition, have been obtained, namely traversable wormholes, the Alcubierre warp drive and the Krasnikov tube. These solutions are related to superluminal travel, although locally the speed of light is not surpassed. It is difficult to define faster-than-light travel in generic space-times, and one can construct metrics which apparently allow superluminal travel, but are in fact flat Minkowski space-times. Therefore, to avoid these difficulties it is important to provide an appropriate definition of superluminal travel.

Francisco Lobo; Paulo Crawford

2002-04-09T23:59:59.000Z

166

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

167

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

168

Space-Time Cross-Mapping and Application to Wave Scattering  

E-Print Network [OSTI]

Causality creates an asymmetry between space and time, even though the wave equation treats them on equal footing. In this work, we leverage this asymmetry to construct a cross-mapping between space and time. This cross-mapping is applied to simplify scattering in space-varying media, by eliminating the infinite reflections between interfaces. The method is shown to transform the implicit transfer matrix method into an explicit method for the analysis of electromagnetic field scattering by a stratified medium.

Salem, Mohamed A

2015-01-01T23:59:59.000Z

169

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

170

Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate  

DOE Patents [OSTI]

Optical imaging through turbid media is demonstrated using a degenerate four-wave mixing correlation time gate. An apparatus and method for detecting ballistic and/or snake light while rejecting unwanted diffusive light for imaging structures within highly scattering media are described. Degenerate four-wave mixing (DFWM) of a doubled YAG laser in rhodamine 590 is used to provide an ultrafast correlation time gate to discriminate against light that has undergone multiple scattering and therefore has lost memory of the structures within the scattering medium. Images have been obtained of a test cross-hair pattern through highly turbid suspensions of whole milk in water that are opaque to the naked eye, which demonstrates the utility of DFWM for imaging through turbid media. Use of DFWM as an ultrafast time gate for the detection of ballistic and/or snake light in optical mammography is discussed.

Sappey, Andrew D. (Golden, CO)

1998-04-14T23:59:59.000Z

171

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

172

Travel Policy and Procedures  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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

173

Travel Policy and Procedures  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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

174

Travel Policy and Procedures  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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

175

Comparison of Signals from Gravitational Wave Detectors with Instantaneous Time-Frequency Maps  

E-Print Network [OSTI]

Gravitational wave astronomy relies on the use of multiple detectors, so that coincident detections may distinguish real signals from instrumental artifacts, and also so that relative timing of signals can provide the sky position of sources. We show that the comparison of instantaneous time-frequency and time- amplitude maps provided by the Hilbert-Huang Transform (HHT) can be used effectively for relative signal timing of common signals, to discriminate between the case of identical coincident signals and random noise coincidences, and to provide a classification of signals based on their time-frequency trajectories. The comparison is done with a chi-square goodness-of-fit method which includes contributions from both the instantaneous amplitude and frequency components of the HHT to match two signals in the time domain. This approach naturally allows the analysis of waveforms with strong frequency modulation.

Alexander Stroeer; Lindy Blackburn; Jordan Camp

2011-05-24T23:59:59.000Z

176

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

177

Conservation laws for time-fractional subdiffusion and diffusion-wave equations  

E-Print Network [OSTI]

The concept of nonlinear self-adjointness is employed to construct the conservation laws for fractional evolution equations using its Lie point symmetries. The approach is demonstrated on subdiffusion and diffusion-wave equations with the Riemann-Liouville and Caputo time-fractional derivatives. It is shown that these equations are nonlinearly self-adjoint and therefore desired conservation laws can be obtained using appropriate formal Lagrangians. Fractional generalizations of the Noether operators are also proposed for the equations with the Riemann-Liouville and Caputo time-fractional derivatives of order $\\alpha \\in (0,2)$. Using these operators and formal Lagrangians, new conserved vectors have been constructed for the linear and nonlinear fractional subdiffusion and diffusion-wave equations corresponding to its Lie point symmetries.

Stanislav Yu. Lukashchuk

2014-05-29T23:59:59.000Z

178

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

179

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

SciTech Connect (OSTI)

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

180

An FPGA Wave Union TDC for Time-of-Flight Applications  

SciTech Connect (OSTI)

An 18-channel time-of-flight (TOF) grade time-to-digit converter (TDC) has been implemented in a low cost FPGA device. The TDC has the following unique features. (1) The time recording structures of the TDC is based on the 'wave union TDC' we developed in our previous work. A leading edge of the input hit launches a bit pattern, or wave union into the delay chain-register array structure which yields two usable measurements. The two measurements effectively sub-divide timing bins for each other especially the 'ultra-wide bins' caused by the FPGA logic array block (LAB) structure and improves measurement precision both in terms of maximum bin width and RMS resolution. A coarser measurement on input signal trailing edge is also provided for time-over-threshold (TOT) applications. (2) The TDC supports advanced timing reference distribution schemes that are superior to conventional common start/stop schemes. The TDC has 16 regular measurement channels plus two channels for timing reference. The timing reference is established with multiple measurements rather than single shot common start/stop. An advanced scheme, the mean-timing approach even eliminates needs of high quality timing distribution media. (3) The ASIC-like encapsulation of the FPGA TDC significantly shorten the learning curve for potential users while maintain certain flexibility for various applications. Necessary digital post-processing functions including semicontinuous automatic calibration, data buffer, data link jam prevention logic etc. are integrated into the firmware to provide a turn-key solution for users.

Wu, J.; /Fermilab

2009-01-01T23:59:59.000Z

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

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

182

Official Foreign Travel  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To establish Department of Energy (DOE) and National Nuclear Security Administration (NNSA) requirements and responsibilities governing official foreign travel by Federal and contractor employees. The Page Change 1 to the CRD issued 11-8-02, will expand the requirements for country clearance for contractors to include all official foreign travel, including travel to nonsensitive countries. Cancels DOE O 551.1. Canceled by DOE O 551.1B.

2002-11-08T23:59:59.000Z

183

Wave VelocityWave Velocity Diff t f ti l l itDifferent from particle velocity  

E-Print Network [OSTI]

Wave VelocityWave Velocity v=/T =f Diff t f ti l l itDifferent from particle velocity Depends on the medium in which the wave travelsDepends on the medium in which the wave travels stringaonvelocity F v of Waves11-8. Types of Waves Transverse wave Longitudinal wave Liu UCD Phy1B 2014 37 #12;Sound Wave

Yoo, S. J. Ben

184

Official Foreign Travel  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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

185

Official Foreign Travel  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

The Order sets forth requirements and responsibilities governing official foreign travel by Federal and contractor employees. Cancels DOE O 551.1B.

2008-06-24T23:59:59.000Z

186

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

SciTech Connect (OSTI)

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

187

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

188

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

189

Understanding the Hellings and Downs curve for pulsar timing arrays in terms of sound and electromagnetic waves  

E-Print Network [OSTI]

Searches for gravitational-wave backgrounds using pulsar timing arrays look for correlations in the timing residuals induced by the background across the pulsars in the array. The correlation signature of an isotropic, unpolarized gravitational-wave background predicted by general relativity follows the so-called Hellings and Downs curve, which is a relatively simple function of the angle between a pair of pulsars. To aid students and beginning researchers interested in pulsar timing, we give a pedagogical discussion of the Helling and Downs curve for pulsar timing arrays, considering simpler analogous scenarios involving sound and electromagnetic waves. We calculate Hellings-and-Downs type functions for these two scenarios and develop a framework suitable for doing more general correlation calculations.

Jenet, Fredrick A

2014-01-01T23:59:59.000Z

190

Understanding the Hellings and Downs curve for pulsar timing arrays in terms of sound and electromagnetic waves  

E-Print Network [OSTI]

Searches for gravitational-wave backgrounds using pulsar timing arrays look for correlations in the timing residuals induced by the background across the pulsars in the array. The correlation signature of an isotropic, unpolarized gravitational-wave background predicted by general relativity follows the so-called Hellings and Downs curve, which is a relatively simple function of the angle between a pair of pulsars. To aid students and beginning researchers interested in pulsar timing, we give a pedagogical discussion of the Helling and Downs curve for pulsar timing arrays, considering simpler analogous scenarios involving sound and electromagnetic waves. We calculate Hellings-and-Downs type functions for these two scenarios and develop a framework suitable for doing more general correlation calculations.

Fredrick A. Jenet; Joseph D. Romano

2014-12-03T23:59:59.000Z

191

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

E-Print Network [OSTI]

Earthquake and submarine mass failure are the most frequent causes of tsunami waves. While the process of the tsunami generation by earthquakes is reasonably well understood, the generation of tsunami waves during submarine mass failure is not...

O'Shay, Justin

2012-07-16T23:59:59.000Z

192

Shape Waves in 2D Josephson Junctions: Exact Solutions and Time Dilation  

SciTech Connect (OSTI)

We predict a new class of excitations propagating along a Josephson vortex in two-dimensional Josephson junctions. These excitations are associated with the distortion of a Josephson vortex line and have an analogy with shear waves in solid mechanics. Their shapes can have an arbitrary profile, which is retained when propagating. We derive a universal analytical expression for the energy of arbitrary shape excitations, investigate their influence on the dynamics of a vortex line, and discuss conditions where such excitations can be created. Finally, we show that such excitations play the role of a clock for a relativistically moving Josephson vortex and suggest an experiment to measure a time dilation effect analogous to that in special relativity.

Gulevich, D. R.; Savel'ev, Sergey [Physics Department, Loughborough University, Leicestershire, LE11 3TU (United Kingdom); Advanced Science Institute, Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198 (Japan); Kusmartsev, F. V. [Physics Department, Loughborough University, Leicestershire, LE11 3TU (United Kingdom); Yampol'skii, V. A. [Advanced Science Institute, Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198 (Japan); Usikov Institute for Radiophysics and Electronics, Ukrainian Academy of Science, 61085 Kharkov (Ukraine); Nori, Franco [Advanced Science Institute, Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198 (Japan); MCTP, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)

2008-09-19T23:59:59.000Z

193

Official Foreign Travel  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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 551.1. Canceled by DOE O 551.1B.

2000-08-25T23:59:59.000Z

194

Official Foreign Travel  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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

195

Official Foreign Travel  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

Establishes Department of Energy (DOE) requirements and responsibilities governing official foreign travel by Federal and contract employees. Cancels DOE O 1500.3. Canceled by DOE O 551.1A.

2000-01-31T23:59:59.000Z

196

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

197

Forecast constraints on cosmic strings from future CMB, pulsar timing and gravitational wave direct detection experiments  

E-Print Network [OSTI]

We study future observational constraints on cosmic string parameters from various types of next-generation experiments: direct detection of gravitational waves (GWs), pulsar timing array, and the cosmic microwave background (CMB). We consider both GW burst and stochastic GW background searches by ground- and space-based interferometers as well as GW background detection in pulsar timing experiments. We also consider cosmic string contributions to the CMB temperature and polarization anisotropies. These different types of observations offer independent probes of cosmic strings and may enable us to investigate cosmic string properties if the signature is detected. In this paper, we evaluate the power of future experiments to constrain cosmic string parameters, such as the string tension Gmu, the initial loop size alpha, and the reconnection probability p, by performing Fisher information matrix calculations. We find that combining the information from the different types of observations breaks parameter degeneracies and provides more stringent constraints on the parameters. We also find future space-borne interferometers independently provide a highly precise determination of the parameters.

Sachiko Kuroyanagi; Koichi Miyamoto; Toyokazu Sekiguchi; Keitaro Takahashi; Joseph Silk

2013-02-19T23:59:59.000Z

198

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

SciTech Connect (OSTI)

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

199

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

200

Numerical solution of the time dependent Ginzburg-Landau equations for mixed (d + s)-wave superconductors  

SciTech Connect (OSTI)

The time-dependent Ginzburg-Landau formalism for (d + s)-wave superconductors and their representation using auxiliary fields is investigated. By using the link variable method, we then develop suitable discretization of these equations. Numerical simulations are carried out for a mesoscopic superconductor in a homogeneous perpendicular magnetic field which revealed peculiar vortex states.

Gonçalves, W. C. [Departamento de Física, Faculdade de Ciências, Univ Estadual Paulista - UNESP, Caixa Postal 473, CEP 17033-360, Bauru, SP (Brazil)] [Departamento de Física, Faculdade de Ciências, Univ Estadual Paulista - UNESP, Caixa Postal 473, CEP 17033-360, Bauru, SP (Brazil); Sardella, E. [Departamento de Física, Faculdade de Ciências, Univ Estadual Paulista - UNESP, Caixa Postal 473, CEP 17033-360, Bauru, SP (Brazil) [Departamento de Física, Faculdade de Ciências, Univ Estadual Paulista - UNESP, Caixa Postal 473, CEP 17033-360, Bauru, SP (Brazil); UNESP-Universidade Estadual Paulista, IPMet-Instituto de Pesquisas Meteorológicas, CEP 17048-699 Bauru, SP (Brazil); Becerra, V. F. [Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen (Belgium)] [Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen (Belgium); Miloševi?, M. V.; Peeters, F. M. [Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen (Belgium) [Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen (Belgium); Departamento de Física, Universidade Federal do Ceará, 60455-900 Fortaleza, Ceará (Brazil)

2014-04-15T23:59:59.000Z

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.


201

Travel | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassiveSubmittedStatusButlerTransportation From modeling andTransuranicTravel Travel

202

Space Travel Space Travel: Past, Present and Future  

E-Print Network [OSTI]

ideas to work on, but warp drive and worm holes may have to wait. #12;Interstellar Travel: Issues 1. How

Shirley, Yancy

203

REQUEST FOR TRAVEL AUTHORIZATION Document ID #  

E-Print Network [OSTI]

REQUEST FOR TRAVEL AUTHORIZATION Document ID # Name: UTEID: Travel Dates: Begin: End: Destination," please allow one month for processssing. Helpful Information: Navigant (Travel Management) (512

Texas at Austin, University of

204

Reporting Unofficial Foreign Travel  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

Establishes requirements for the reporting of unofficial travel to foreign countries by DOE and DOE contractor employees that hold an access authorization (personnel security clearances). DOE N 251.40, dated 5/3/01, extended this directive until 12/31/01.

2000-12-15T23:59:59.000Z

205

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

206

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

207

Electronic Travel Documents (VE5,  

E-Print Network [OSTI]

Electronic Travel Documents (VE5, VE6, VP5) 512-471-8802 · askUS@austin.utexas.edu · www ................................................................................................. 10 III. ELECTRONIC RTA - CORRECTION DOCUMENT (VE6 ......................................................................................... 36 C. TRAVEL MANAGEMENT SERVICES

Texas at Austin, University of

208

University of Bath Travel Plan  

E-Print Network [OSTI]

of car sharing, public transport, cycling or walking". 1.4 We are continuously seeking ways to enhance sharing and promote more efficient travel by car for those for whom travel by non-car modes are directed by our intention: (i) to promote travel to and from campus by non-car modes for students, staff

Burton, Geoffrey R.

209

TRAVEL DEMAND AND RELIABLE FORECASTS  

E-Print Network [OSTI]

TRAVEL DEMAND AND RELIABLE FORECASTS FOR TRANSIT MARK FILIPI, AICP PTP 23rd Annual Transportation transportation projects § Develop and maintain Regional Travel Demand Model § Develop forecast socio in cooperative review during all phases of travel demand forecasting 4 #12;Cooperative Review Should Include

Minnesota, University of

210

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

211

Time-resolved X-ray diffraction studies of laser-induced acoustic wave propagation in bilayer metallic thin crystals  

SciTech Connect (OSTI)

Phonon propagation across the interface of a Cu/Ag(111) bilayer and transient lattice disorder, induced by a femtosecond 267?nm pulse, in Ag(111) crystal have been measured by means of time resolved X-ray diffraction. A “blast” force due to thermal stress induced by suddenly heated electrons is formed within two picoseconds after excitation and its “blast wave” propagation through the interface and Ag (111) crystal was monitored by the shift and broadening of the rocking curve, I vs. ?, as a function of time after excitation. Lattice disorder, contraction and expansion as well as thermal strain formation and wave propagation have also been measured. The experimental data and mechanism proposed are supported by theoretical simulations.

Er, Ali Oguz [Department of Physics and Astronomy, Western Kentucky University, Bowling Green, Kentucky 42101 (United States); Tang, Jau, E-mail: jautang@gate.sinica.edu.tw, E-mail: prentzepis@ece.tamu.edu [Research Center for Applied Sciences Academia Sinica, Taipei, Taiwan (China); Chen, Jie [Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China); Rentzepis, Peter M., E-mail: jautang@gate.sinica.edu.tw, E-mail: prentzepis@ece.tamu.edu [Department of Electrical and Computer Engineering, Texas A and M University, College Station, Texas 77843 (United States)

2014-09-07T23:59:59.000Z

212

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

2008-12-10T23:59:59.000Z

213

EXPENDITURE OBJECT CODES Travel TRAVEL includes expenditures to pay for travel expenses.  

E-Print Network [OSTI]

, Puerto Rico, and the Virgin Islands. 2400 Rentals and Leases of Automobiles and Trucks for Travel: Commercial rentals and leases of automobiles and trucks used by employees for travel within the 50 United of Automobiles, Trucks and Boats for Foreign Travel: Commercial rentals and leases of automobiles, trucks

Harms, Kyle E.

214

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

215

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

216

It is increasingly common for graduates to consider taking time out on completion of their studies. Travelling, volunteering, gap years or flexible working may be just  

E-Print Network [OSTI]

whilst you take stock of your short and long term career objectives. Things to think about: · What do youIt is increasingly common for graduates to consider taking time out on completion of their studies and abroad · Deferring entry to postgraduate study · Researching employers open to the idea of you taking

217

HOME U.S. POLITICS WORLD BIZ & TECH HEALTH & SCIENCE ENTERTAINMENT TRAVEL PEOPLE PHOTOS VIDEO BEST & WORST LISTS MAGAZINE Subscribe to Time Give a Gift  

E-Print Network [OSTI]

. The next step: creating Geobacter-based fuel cells that can generate cheap, clean electricity. View > The Best Inventions The Electric Microbe BACK NEXT 20 of 52 View All HEADCASE DESIGN FOR TIME Bacteria have always gotten a bad rap. But we should be thankful for one especially talented microbe, Geobacter, which

Lovley, Derek

218

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

SciTech Connect (OSTI)

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

219

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

220

Estimation of scalar moments from explosion-generated surface waves  

SciTech Connect (OSTI)

Rayleigh waves from underground nuclear explosions are used to estimate scaler moments for 40 Nevada Test Site (NTS) explosions and 18 explosions at the Soviet East Kazakh test site. The Rayleigh wave spectrum is written as a product of functions that depend on the elastic structure of the travel path, the elastic structure of the source region and the Q structure of the path. Results are used to examine the worldwide variability of each factor and the resulting variability of surface wave amplitudes. The path elastic structure and Q structure are found by inversion of Rayleigh wave phase and group velocities and spectral amplitudes. The Green's function derived from this structure is used to estimate the moments of explosions observed along the same path. This procedure produces more consistent amplitude estimates than conventional magnitude measurements. Network scatter in log moment is typically 0.1. In contrast with time-domain amplitudes, the elastic structure of the travel path causes little variability in spectral amplitudes. When the mantle Q is constrained to a value of approximately 100 at depths greater than 120 km, the inversion for Q and moment produces moments that remain constant with distance. Based on the best models available, surface waves from NTS explosions should be larger than surface waves from East Kazakh explosions with the same moment. Estimated scaler moments for the largest East Kazakh explosions since 1976 are smaller than the estimated moments for the largest NTS explosions for the same time period.

Stevens, J.L.

1985-04-01T23:59:59.000Z

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.


221

Travel | The Ames Laboratory  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassiveSubmittedStatusButlerTransportation From modeling andTransuranicTravel

222

Travel Requirements - ITER  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layered NbS2Topo II:LIGHT-DUTYTransportationEffectsTravel

223

An Optimal Path Model for the Risk-Averse Traveler  

E-Print Network [OSTI]

... expected utilities (Eiger et al. 1985, Murthy and Sarkar 1996, Sivakumar and Batta 1994, Sen et al. 2001), worst-case travel times (Yu and Yang 1998, Bell and.

2015-02-13T23:59:59.000Z

224

Interstellar Travel & The Fermi Paradox  

E-Print Network [OSTI]

to work on, but warp drive and worm holes may have to wait. #12;Interstellar Travel: Issues 1. How far do

Shirley, Yancy

225

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

SciTech Connect (OSTI)

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

226

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

227

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

228

Wave-pinned filaments of scroll waves Tams Bnsgi, Jr., Kevin J. Meyer, and Oliver Steinbocka  

E-Print Network [OSTI]

Wave-pinned filaments of scroll waves Tamás Bánsági, Jr., Kevin J. Meyer, and Oliver Steinbocka Received 5 November 2007; accepted 26 December 2007; published online 6 March 2008 Scroll waves are three can be pinned to the wake of traveling wave pulses. This pinning is studied in experiments with the 1

Steinbock, Oliver

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

Smartmover Travel Guide Think ahead...  

E-Print Network [OSTI]

to encourage all members of the University community to walk, cycle, car share or use public transport your health and could save you money each year in fuel costs o As an alternative to this car sharing;Sustainable travel Around 26% of CO2 emissions generated in the UK are caused by personal car travel

Birmingham, University of

231

A novel method to determine the elastic modulus of thin films using a travelling interference pattern  

SciTech Connect (OSTI)

Recently picosecond techniques have been used to generate surface acoustic waves (SAW) with wavelengths of a few microns. Previously generation of short SAW wavelengths required a laser pulse duration shorter than the transit time of the acoustic wave as it traverses the spatial pattern produced by the laser and a thermal relaxation time much faster than the acoustic time constant. In this paper we wish to report an investigation using spatially and temporally modulated light beams using long lasers pulses as a means to generate short acoustic wavelengths. Such a method may be useful in measuring the elastic modulus of thin films. The experiment that is being conducted utilizes two laser beams, one at frequency, vo, and the other at a shifted frequency, vo-v{prime}, to form a traveling interference pattern. The method of generating these frequencies will be described. By adjusting the angle between the two laser beams, the surface wave speed of an arbitrary material used for a thin film can be selectively matched. Using a YAG laser at 1064 rim to create the moving gratings, surface acoustic wavelengths of 1-3 microns may be generated in a variety of materials. The penetration depth of the acoustic wave is approximately the wavelength itself, thus, this method is well suited for characterizing thin films. For multiple thin film layers of different materials, SAW can be selectively produced in any layer of interest provided the top layers are transparent enough to allow the laser energy to be deposited on the intended layer. The presence of these modulated surface waves is detected by a He-Ne laser using light scattering. From the measured surface acoustic wave velocity, Poisson`s ratio, and the specimen density, the elastic modulus may be calculated. Measurements in progress will be reported for a variety of materials.

Amimoto, S.T.; Chang, D.J. [Aerospace Corporation, Los Angeles, CA (United States)

1995-12-31T23:59:59.000Z

232

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

E-Print Network [OSTI]

for various combinations of t1 and t2 and the parabolic case..................................... 34 4-2 Time domain plots of normalized displacement at 10 nm for various combinations of t1 and t2 and the parabolic case .................. 35 4...-3 Time domain plots of normalized temperature at 30 nm for various combinations of t1 and t2 and the parabolic case .................. 37 4-4 Time domain plots of normalized displacement at 30 nm for various combinations of t1 and t2...

Nagaraj, Mahavir

2004-11-15T23:59:59.000Z

233

Time-Integrated Gamma-Ray Burst Synchrotron Spectra from Blast Wave/Cloud Interactions  

E-Print Network [OSTI]

We show that the spectral shape of the low energy tails found for the time-integrated spectra of gamma-ray bursts, even in the absence of strong synchrotron cooling, can be significantly softer than the $\

James Chiang

1998-10-15T23:59:59.000Z

234

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

SciTech Connect (OSTI)

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

ADMINISTRATIVE RECORDS SCHEDULE 9: TRAVEL AND TRANSPORTATION...  

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

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

236

Travel Behavior and Demand Analysis and Prediction  

E-Print Network [OSTI]

Travel Behaviour Research, Lucerne, August 2003. Savage L.Travel Behaviour Research, Lucerne, 10-15, August 2003. InBehevaior Research (IATBR). Lucerne, Switzerland, 2003.

Goulias, Konstadinos G

2007-01-01T23:59:59.000Z

237

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

238

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

239

QUASI-PERIODIC FAST-MODE WAVE TRAINS WITHIN A GLOBAL EUV WAVE AND SEQUENTIAL TRANSVERSE OSCILLATIONS DETECTED BY SDO/AIA  

SciTech Connect (OSTI)

We present the first unambiguous detection of quasi-periodic wave trains within the broad pulse of a global EUV wave (so-called EIT wave) occurring on the limb. These wave trains, running ahead of the lateral coronal mass ejection (CME) front of 2-4 times slower, coherently travel to distances {approx}> R{sub Sun }/2 along the solar surface, with initial velocities up to 1400 km s{sup -1} decelerating to {approx}650 km s{sup -1}. The rapid expansion of the CME initiated at an elevated height of 110 Mm produces a strong downward and lateral compression, which may play an important role in driving the primary EUV wave and shaping its front forwardly inclined toward the solar surface. The wave trains have a dominant 2 minute periodicity that matches the X-ray flare pulsations, suggesting a causal connection. The arrival of the leading EUV wave front at increasing distances produces an uninterrupted chain sequence of deflections and/or transverse (likely fast kink mode) oscillations of local structures, including a flux-rope coronal cavity and its embedded filament with delayed onsets consistent with the wave travel time at an elevated (by {approx}50%) velocity within it. This suggests that the EUV wave penetrates through a topological separatrix surface into the cavity, unexpected from CME-caused magnetic reconfiguration. These observations, when taken together, provide compelling evidence of the fast-mode MHD wave nature of the primary (outer) fast component of a global EUV wave, running ahead of the secondary (inner) slow component of CME-caused restructuring.

Liu Wei; Nitta, Nariaki V.; Aschwanden, Markus J.; Schrijver, Carolus J.; Title, Alan M.; Tarbell, Theodore D. [Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Palo Alto, CA 94304 (United States); Ofman, Leon, E-mail: weiliu@lmsal.com [Department of Physics, Catholic University of America, Washingtom, DC 20064 (United States)

2012-07-01T23:59:59.000Z

240

Uppermost mantle P wave velocities beneath Turkey and Iran  

SciTech Connect (OSTI)

The uppermost mantle P wave velocities beneath Turkey and Iran were estimated by applying the conventional travel time-distance relation method to arrival times of well located earthquakes recorded at a few stations. The average uppermost mantle P wave velocity under Turkey is estimated from two stations of the World Wide Standardized Seismograph Network (WWSSN), Istanbul and Tabriz. The data are consistent with a crust of uniform, but poorly determined, thickness and an uppermost mantle P wave velocity of 7.73 +- 0.08 km/s. This velocity is very similar to that for the Aegean Sea and suggests that its structure could be closely related to that beneath Turkey. For Iran, the results calculated from travel times to three WWSSN stations, Meshed, Shiraz, and Tabriz, can be explained by a crust dipping toward the south-southeast at about 1/sup 0/ with an uppermost mantle P wave velocity of 8.0 +- 0.1 km/s. If the crustal thickness were 34 km in the north it would reach about 49 km in the south. Based on these uppermost mantle velocities, the temperature at Moho beneath Turkey is probably close to the melting temperature of peridotite but that beneath Iran is probably lower.

Chen, C.; Chen, W.; Molnar, P.

1980-01-01T23:59:59.000Z

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.


241

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.

242

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.

243

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.

244

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.

245

A Quantum Mechanical Travelling Salesman  

E-Print Network [OSTI]

A quantum simulation of a travelling salesman is described. A vector space for a graph is defined together with a sequence of operators which transform a special initial state into a superposition states representing Hamiltonian tours. The quantum amplitude for any tour is a function of the classical cost of travelling along the edges in that tour. Tours with the largest quantum amplitude may be different than those with the smallest classically-computed cost.

Ravindra N. Rao

2011-08-23T23:59:59.000Z

246

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

247

Employee Acknowledgment of Risks in Traveling to Countries on the State Department's Travel Warning List  

E-Print Network [OSTI]

Employee Acknowledgment of Risks in Traveling to Countries on the State Department's Travel Warning List I acknowledge that I have read the U.S. State Department Travel Warning regarding travel warnings and I accept responsibility for keeping myself informed of such changes. I acknowledge that travel

Holland, Jeffrey

248

2001 New York State NHTS: Travel Patterns of Special Populations  

SciTech Connect (OSTI)

Policymakers 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 accommodate future demands; to assess the feasibility and efficiency of alternative congestion-alleviating technologies (e.g., high-speed rail, magnetically levitated trains, 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. Longer-distance travel was collected in 1977 and 1995. The 2001 National Household Travel Survey (NHTS) collected both daily and longer-distance trips in one survey. 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 was not part of the survey. New York State participated in the 2001 NHTS by procuring additional 12,000 sample households. These additional sample households allowed New York State to address transportation planning issues pertinent to geographic areas that are significantly smaller than what the national NHTS data allowed. The final sample size for New York State was 13,423 usable households. In this report, Oak Ridge National Laboratory (ORNL) identifies and analyzes differences, if any, in travel patterns that are attributable to demographic characteristics (e.g., gender, age, race and ethnicity), household characteristics (e.g., low income households, zero and one car households), modal characteristics and geographic location. Travel patterns of those who work at home are examined and compared to those of conventional workers, as well as those who do not work. Focus is given to trip frequency, travel by time of day, trip purpose, and mode choice. For example, included in this analysis is the mobility of the elderly population in New York State. The American society is undergoing a major demographic transformation that is resulting in a greater percentage of older individuals in the population. In addition to demographic changes, recent travel surveys show that an increasing number of older individuals are licensed to drive and that they drive more than their same age cohort did a decade ago. Cohort differences in driving are particularly apparent - not only are more of today's elderly population licensed to drive than their age cohort two decades ago, they also drive more. Equally important are the increase in immigration and in racial and cultural diversity. This report also discusses vehicle availability, socioeconomic characteristics, travel trends (e.g., miles travelled, distance driven, commute patterns), and the transportation accessibility of these populations. Specifically, this report addresses in detail the travel behavior of the following special populations: (1) the elderly, defined as those who were 65 years old or older, (2) low-income households, (3) ethnic groups and immigrants, and (4) those who worked at home.

Hu, Patricia S [ORNL; Reuscher, Tim [ORNL

2010-03-01T23:59:59.000Z

249

Chapter 10: Waves Did you read chapter 10  

E-Print Network [OSTI]

Properties: Speed The speed of sound is 340 m/s (about 1/5 mile/sec) The speed of light is 3x108 m/s You unchanged Speed = frequency Ã? wavelength. Sound "Talking" Outboard Propeller whine A compression wave Compression waves can travel through solids and fluids Solid Liquid Gas #12;2 Types of Waves: Transverse waves

Hart, Gus

250

Shock wave propagation in composites and active Vinamra Agrawal  

E-Print Network [OSTI]

Shock wave propagation in composites and active Vinamra Agrawal California Institute of Technology travel through a material. These waves are characterized as a discontinuity propagating through shock waves propagate in heterogeneous materials. Shock waves are also being used to o pulsed currents

Shyamasundar, R.K.

251

POINTWISE GREEN FUNCTION BOUNDS AND STABILITY OF COMBUSTION WAVES  

E-Print Network [OSTI]

POINTWISE GREEN FUNCTION BOUNDS AND STABILITY OF COMBUSTION WAVES GREGORY LYNG, MOHAMMADREZA ROOFI for traveling wave solutions of an abstract viscous combustion model including both Majda's model and the full-wave) approximation. Notably, our results apply to combustion waves of any type: weak or strong, detonations or defla

Texier, Benjamin - Institut de Mathématiques de Jussieu, Université Paris 7

252

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

SciTech Connect (OSTI)

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

253

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

254

Water-waves as a spatial reversible dynamical system, influence of ...  

E-Print Network [OSTI]

The mathematical study of travelling waves, in the context of two di- mensional ... A normal form analysis shows that in most cases, the dynamics on the center ...

2004-10-08T23:59:59.000Z

255

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

256

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

SciTech Connect (OSTI)

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

257

Harmonic oscillator with time-dependent effective-mass and frequency with a possible application to 'chirped tidal' gravitational waves forces affecting interferometric detectors  

E-Print Network [OSTI]

The general theory of time-dependent frequency and time-dependent mass ('effective mass') is described.The general theory for time-dependent harmonic- oscillator is applied in the present research for studying certain quantum effects in the interferometers for detecting gravitational waves.When an astronomical binary system approaches its point of coalescence the gravitational wave intensity and frequency are increasing and this can lead to strong deviations from the simple description of harmonic-oscillations for the interferometric masses on which the mirrors are placed.It is shown that under such condtions the harmonic-oscillations of these masses can be described by mechanical harmonic-oscillators with time-dependent frequency and effective-mass. In the present theoretical model the effective-mass is decreasing with time describing pumping phenomena in which the oscillator amplitude is increasing with time . The quantization of this system is analyzed by the use of the adiabatic approximation. It is found that the increase of the gravitational wave intensity, within the adiabatic approximation, leads to squeezing phenomena where the quantum noise in one quadrature is increased and in the other quadrature is decreased.

Yacob Ben-Aryeh

2008-07-29T23:59:59.000Z

258

Spatiotemporal synchronization of drift waves in a magnetron sputtering plasma  

SciTech Connect (OSTI)

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

259

A Mathematics Education Researcher's Travels  

E-Print Network [OSTI]

A Mathematics Education Researcher's Travels: Perspectives on Mathematics Education Research from Academia, Government, and Professional Societies Karen D. King, PhD Association of Women in Mathematics for the Intersections of Mathematics and Mathematics Education Perspectives from my past that echo today Current

Belding, Juliana

260

Doctoral Student Travel Program Application for Support  

E-Print Network [OSTI]

(in order): Place of Travel: From To Dates of Travel Leave Return Estimated Expenses Total Cost or sharing expected) Number of nights @ $ $ Meals Number of days @ $ $ Other - specify $ Total Estimated

Mohaghegh, Shahab

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

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

262

Greenhouse Gas Mitigation Planning for Business Travel  

Broader source: Energy.gov [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...

263

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

264

University of Michigan -Traveler Contact Information Name __________________________________  

E-Print Network [OSTI]

University of Michigan - Traveler Contact Information Name __________________________________ Phone __________________________________ Email __________________________________ University of Michigan/Clinic __________________________________ Address __________________________________ Phone __________________________________ University of Michigan

Eustice, Ryan

265

Non-destructive thermal wave method applied to study thermal properties of fast setting time endodontic cement  

SciTech Connect (OSTI)

The thermal wave method is applied for thermal properties measurement in fast endodontic cement (CER). This new formula is developed upon using Portland cement in gel and it was successfully tested in mice with good biocompatibility and stimulated mineralization. Recently, thermal expansion and setting time were measured, conferring to this material twice faster hardening than the well known Angelus Mineral trioxide aggregate (MTA) the feature of fast hardening (?7?min) and with similar thermal expansion (?12??strain/?°C). Therefore, it is important the knowledge of thermal properties like thermal diffusivity, conductivity, effusivity in order to match thermally the tissue environment upon its application in filling cavities of teeth. Photothermal radiometry technique based on Xe illumination was applied in CER disks 600 ?m thick for heating, with prepared in four particle sizes (25, 38, 45, and 53) ?m, which were added microemulsion gel with variation volumes (140, 150, 160, and 170) ?l. The behavior of the thermal diffusivity CER disks shows linear decay for increase emulsion volume, and in contrast, thermal diffusivity increases with particles sizes. Aiming to compare to MTA, thermal properties of CER were averaged to get the figure of merit for thermal diffusivity as (44.2 ± 3.6) × 10{sup ?3} cm{sup 2}/s, for thermal conductivity (228 ± 32) mW/cm K, the thermal effusivity (1.09 ± 0.06) W s{sup 0.5}/cm{sup 2} K and volume heat capacity (5.2 ± 0.7) J/cm{sup 3} K, which are in excellent agreement with results of a disk prepared from commercial MTA-Angelus (grain size < 10 ?m using 57 ?l of distilled water)

Picolloto, A. M.; Mariucci, V. V. G.; Szpak, W.; Medina, A. N.; Baesso, M. L.; Astrath, N. G. C.; Astrath, F. B. G.; Bento, A. C., E-mail: acbento@uem.br [Departamento de Física, Grupo de Espectroscopia Fotoacústica e Fototérmica, Universidade Estadual de Maringá – UEM, Av. Colombo 5790, 87020-900 Maringá, Paraná (Brazil); Santos, A. D.; Moraes, J. C. S. [Departamento de Física e Química, Universidade Estadual Paulista Júlio de Mesquita Filho – UNESP, Av. Brasil 56, 15385-000 Ilha Solteira, SP (Brazil)

2013-11-21T23:59:59.000Z

266

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

267

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

268

New York Household Travel Patterns: A Comparison Analysis  

SciTech Connect (OSTI)

In 1969, the U. S. Department of Transportation began collecting detailed data on personal travel to address various transportation planning issues. These issues range from assessing transportation investment programs to developing new technologies to alleviate congestion. This 1969 survey was the birth of the Nationwide Personal Transportation Survey (NPTS). The survey was conducted again in 1977, 1983, 1990 and 1995. Longer-distance travel was collected in 1977 and 1995. In 2001, the survey was renamed to the National Household Travel Survey (NHTS) and collected both daily and longer-distance trips in one survey. In addition to the number of sample households that the national NPTS/NHTS survey allotted to New York State (NYS), the state procured an additional sample of households in both the 1995 and 2001 surveys. In the 1995 survey, NYS procured an addition sample of more than 9,000 households, increasing the final NY NPTS sample size to a total of 11,004 households. Again in 2001, NYS procured 12,000 additional sample households, increasing the final New York NHTS sample size to a total of 13,423 households with usable data. These additional sample households allowed NYS to address transportation planning issues pertinent to geographic areas significantly smaller than for what the national NPTS and NHTS data are intended. Specifically, these larger sample sizes enable detailed analysis of twelve individual Metropolitan Planning Organizations (MPOs). Furthermore, they allowed NYS to address trends in travel behavior over time. In this report, travel data for the entire NYS were compared to those of the rest of the country with respect to personal travel behavior and key travel determinants. The influence of New York City (NYC) data on the comparisons of the state of New York to the rest of the country was also examined. Moreover, the analysis examined the relationship between population density and travel patterns, and the similarities and differences among New York MPOs. The 1995 and 2001 survey data make it possible to examine and identify travel trends over time. This report does not address, however, the causes of the differences and/or trends.

Hu, Patricia S [ORNL; Reuscher, Tim [ORNL

2007-05-01T23:59:59.000Z

269

Time-periodic solutions of the Benjamin-Ono equation  

SciTech Connect (OSTI)

We present a spectrally accurate numerical method for finding non-trivial time-periodic solutions of non-linear partial differential equations. The method is based on minimizing a functional (of the initial condition and the period) that is positive unless the solution is periodic, in which case it is zero. We solve an adjoint PDE to compute the gradient of this functional with respect to the initial condition. We include additional terms in the functional to specify the free parameters, which, in the case of the Benjamin-Ono equation, are the mean, a spatial phase, a temporal phase and the real part of one of the Fourier modes at t = 0. We use our method to study global paths of non-trivial time-periodic solutions connecting stationary and traveling waves of the Benjamin-Ono equation. As a starting guess for each path, we compute periodic solutions of the linearized problem by solving an infinite dimensional eigenvalue problem in closed form. We then use our numerical method to continue these solutions beyond the realm of linear theory until another traveling wave is reached (or until the solution blows up). By experimentation with data fitting, we identify the analytical form of the solutions on the path connecting the one-hump stationary solution to the two-hump traveling wave. We then derive exact formulas for these solutions by explicitly solving the system of ODE's governing the evolution of solitons using the ansatz suggested by the numerical simulations.

Ambrose , D.M.; Wilkening, Jon

2008-04-01T23:59:59.000Z

270

Gravitational wave radiometry: Mapping a stochastic gravitational wave background  

SciTech Connect (OSTI)

The problem of the detection and mapping of a stochastic gravitational wave background (SGWB), either cosmological or astrophysical, bears a strong semblance to the analysis of the cosmic microwave background (CMB) anisotropy and polarization, which too is a stochastic field, statistically described in terms of its correlation properties. An astrophysical gravitational wave background (AGWB) will likely arise from an incoherent superposition of unmodelled and/or unresolved sources and cosmological gravitational wave backgrounds (CGWB) are also predicted in certain scenarios. The basic statistic we use is the cross correlation between the data from a pair of detectors. In order to ''point'' the pair of detectors at different locations one must suitably delay the signal by the amount it takes for the gravitational waves (GW) to travel to both detectors corresponding to a source direction. Then the raw (observed) sky map of the SGWB is the signal convolved with a beam response function that varies with location in the sky. We first present a thorough analytic understanding of the structure of the beam response function using an analytic approach employing the stationary phase approximation. The true sky map is obtained by numerically deconvolving the beam function in the integral (convolution) equation. We adopt the maximum likelihood framework to estimate the true sky map using the conjugate gradient method that has been successfully used in the broadly similar, well-studied CMB map-making problem. We numerically implement and demonstrate the method on signal generated by simulated (unpolarized) SGWB for the GW radiometer consisting of the LIGO pair of detectors at Hanford and Livingston. We include 'realistic' additive Gaussian noise in each data stream based on the LIGO-I noise power spectral density. The extension of the method to multiple baselines and polarized GWB is outlined. In the near future the network of GW detectors, including the Advanced LIGO and Virgo detectors that will be sensitive to sources within a thousand times larger spatial volume, could provide promising data sets for GW radiometry.

Mitra, Sanjit [Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007 (India); Observatoire de la Cote d'Azur, BP 4229, 06304 Nice Cedex 4 (France); Dhurandhar, Sanjeev; Souradeep, Tarun [Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007 (India); Lazzarini, Albert; Mandic, Vuk; Ballmer, Stefan [LIGO Laboratory, California Institute of Technology, MS 18-34, Pasadena, California 91125 (United States); Bose, Sukanta [Department of Physics, Washington State University, Pullman, Washington 99164-2814 (United States)

2008-02-15T23:59:59.000Z

271

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

272

Aggregate vehicle travel forecasting model  

SciTech Connect (OSTI)

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

273

Shock wave compression of hexagonal-close-packed metal single crystals: Time-dependent, anisotropic elastic-plastic response of beryllium  

SciTech Connect (OSTI)

Understanding and modeling the response of hcp metals to high stress impulsive loading is challenging because the lower crystal symmetry, compared to cubic metals, results in a significantly more complex material response. To gain insight into the inelastic deformation of hcp metals subjected to high dynamic stresses, shock wave compression of single crystals provides a useful approach because different inelastic deformation mechanisms can be examined selectively by shock compression along different crystal orientations. As a representative example, we report, here, on wave propagation simulations for beryllium (Be) single crystals shocked along the c-axis, a-axis, and several low-symmetry directions to peak stresses reaching 7?GPa. The simulations utilized a time-dependent, anisotropic material model that incorporated dislocation dynamics, deformation twinning, and shear cracking based descriptions of inelastic deformation. The simulation results showed good overall agreement with measured wave profiles for all the different crystal orientations examined [Pope and Johnson, J. Appl. Phys. 46, 720 (1975)], including features arising from wave mode coupling due to the highly anisotropic inelastic response of Be. This good agreement demonstrates that the measured profiles can be understood in terms of dislocation slip along basal, prismatic, and pyramidal planes, together with deformation twinning along (101{sup ¯}2) planes. Our results show that the response of shocked Be single crystals involves the simultaneous operation of multiple, distinct inelastic deformation mechanisms for all orientations except the c-axis. For shocked c-axis Be, the measured wave profiles do not provide good discrimination between pyramidal slip and other inelastic deformation mechanisms, such as shear cracking. The findings presented here provide insight into the complex inelastic deformation response of shocked Be single crystals and are expected to be useful for other hcp crystals. More broadly, the present work demonstrates the potential of shock wave propagation along low-symmetry directions to examine, and discriminate between, different inelastic deformation mechanisms in crystalline solids.

Winey, J. M.; Gupta, Y. M. [Institute for Shock Physics and Department of Physics, Washington State University, Pullman, Washington 99164 (United States)

2014-07-21T23:59:59.000Z

274

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

275

Quantifying the {sup 12}C+{sup 12}C sub-Coulomb fusion with the time-dependent wave-packet method  

SciTech Connect (OSTI)

This contribution provides a preliminary study of the {sup 12}C+{sup 12}C sub-Coulomb fusion reaction using the time-dependent wave-packet method within a nuclear molecular picture. The theoretical sub-Coulomb fusion resonances seem to correspond well with observations. The present method might be a more suitable tool for expanding the cross-section predictions towards lower energies than the commonly used potential-model approximation.

Diaz-Torres, Alexis; Wiescher, Michael [ECT, Strada delle Tabarelle 286, I-38123 Villazzano, Trento (Italy); JINA and Department of Physics, University of Notre Dame, IN 46656 (United States)

2012-10-20T23:59:59.000Z

276

Wave Propagation Theory 2.1 The Wave Equation  

E-Print Network [OSTI]

2 Wave Propagation Theory 2.1 The Wave Equation The wave equation in an ideal fluid can be derived #12;66 2. Wave Propagation Theory quantities of the quiescent (time independent) medium are identified perturbations is much smaller than the speed of sound. 2.1.1 The Nonlinear Wave Equation Retaining higher

277

PhD Projects and Scholarship Gravitational waves are ripples of space and time created by violent events in the  

E-Print Network [OSTI]

beam needs to be phase locked to the cavity transmission to maintain correct phase to destructively to exciting new physics phenomena and techniques that may have application beyond gravitational wave detectors an optical cavity with an inside mechanical resonator has been frequency locked to the laser and 3-mode

Tobar, Michael

278

Developing de Broglie Wave  

E-Print Network [OSTI]

The electromagnetic component waves, comprising together with their generating oscillatory massless charge a material particle, will be Doppler shifted when the charge hence particle is in motion, with a velocity $v$, as a mere mechanical consequence of the source motion. We illustrate here that two such component waves generated in opposite directions and propagating at speed $c$ between walls in a one-dimensional box, superpose into a traveling beat wave of wavelength ${\\mit\\Lambda}_d$$=(\\frac{v}{c}){\\mit\\Lambda}$ and phase velocity $c^2/v+v$ which resembles directly L. de Broglie's hypothetic phase wave. This phase wave in terms of transporting the particle mass at the speed $v$ and angular frequency ${\\mit\\Omega}_d=2\\pi v /{\\mit\\Lambda}_d$, with ${\\mit\\Lambda}_d$ and ${\\mit\\Omega}_d$ obeying the de Broglie relations, represents a de Broglie wave. The standing-wave function of the de Broglie (phase) wave and its variables for particle dynamics in small geometries are equivalent to the eigen-state solutions to Schr\\"odinger equation of an identical system.

J X Zheng-Johansson; P-I Johansson

2006-08-27T23:59:59.000Z

279

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

280

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

SciTech Connect (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 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

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

Numerical Exercises Course Applied Finite Elements 2012 Tsunami Wave Amplification  

E-Print Network [OSTI]

waves seen on our car window as ripples on water sheets during heavy rain are also shallow water waves-Dimensional Linear Shallow Water Equations Linear shallow water equations (LSWE) describe the the motion of waves travelling on the free surface of a liquid, such as sea water. They govern the motion of small

Al Hanbali, Ahmad

282

Quantum Elastic Net and the Traveling Salesman Problem  

E-Print Network [OSTI]

Theory of computer calculations strongly depends on the nature of elements the computer is made of. Quantum interference allows to formulate the Shor factorization algorithm turned out to be more effective than any one written for classical computers. Similarly, quantum wave packet reduction allows to devise the Grover search algorithm which outperforms any classical one. In the present paper we argue that the quantum incoherent tunneling can be used for elaboration of new algorithms able to solve some NP-hard problems, such as the Traveling Salesman Problem, considered to be intractable in the classical theory of computer computations.

B. F. Kostenko; J. Pribish; M. Z. Yuriev

2008-01-30T23:59:59.000Z

283

Travel  

E-Print Network [OSTI]

Jaroslav 1947 Graffiti at the Wadi el-Allaki. Journal of1986: 200). The same range is evidenced at the Wadi el- Hudiand the Wadi Hammamat in the Middle Kingdom (Shaw 1986:

Köpp-Junk, Heidi

2013-01-01T23:59:59.000Z

284

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

285

Foreign Travel | The Ames Laboratory  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsing ZirconiaPolicyFeasibilityFieldMinds" |beamtheForForeign Travel The

286

Travel Resources | The Ames Laboratory  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layered NbS2Topo II:LIGHT-DUTYTransportationEffectsTravelResources

287

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.

288

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

289

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

290

Progress towards of a superconducting traveling wave accelerating structure  

SciTech Connect (OSTI)

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

291

Fundamentals of Traveling Wave Ion Mobility Spectrometry. | EMSL  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFun with Big Sky Learning Fun with Big Sky Learning| EMSL007 Cloud

292

Gravity Waves Gravity Waves  

E-Print Network [OSTI]

;14/03/2014 6 H L H L L Phase & Group Velocity #12;14/03/2014 7 Doppler Effect #12;14/03/2014 8 Shock Waves #12;14/03/2014 14 Supernova Remnant Cassiopeia A Supernova blast waves #12;14/03/2014 15 Tycho's Remnant (SN 1572AD A SNR flythrough Theory of Supernova Blast Waves Supernovae: Type Ia Subsonic deflagration wave turning

Weijgaert, Rien van de

293

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

294

Bowling Green State University Travel and Entertainment Expenses Athletic/Bowl Game Travel Related  

E-Print Network [OSTI]

Page 1 Bowling Green State University Travel and Entertainment Expenses ­ Athletic/Bowl Game Travel Related The University is required to determine whether there is a taxable benefit (i.e., income) attributable to any persons traveling to or attending an athletic event, specifically a bowl game, when

Moore, Paul A.

295

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

296

Time machines and quantum theory  

E-Print Network [OSTI]

There is a deep structural link between acausal spacetimes and quantum theory. As a consequence quantum theory may resolve some "paradoxes" of time travel. Conversely, non-time-orientable spacetimes naturally give rise to electric charges and spin half. If an explanation of quantum theory is possible, then general relativity with time travel could be it.

Mark J Hadley

2006-12-02T23:59:59.000Z

297

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

298

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

299

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

300

Global regularity of wave maps III. Large energy from $\\R^{1+2}$ to hyperbolic spaces  

E-Print Network [OSTI]

We show that wave maps $\\phi$ from two-dimensional Minkowski space $\\R^{1+2}$ to hyperbolic spaces $\\H^m$ are globally smooth in time if the initial data is smooth, conditionally on some reasonable claims concerning the local theory of such wave maps, as well as the self-similar and travelling (or stationary solutions); we will address these claims in the sequels \\cite{tao:heatwave2}, \\cite{tao:heatwave3}, \\cite{tao:heatwave4} to this paper. Following recent work in critical dispersive equations, the strategy is to reduce matters to the study of an \\emph{almost periodic} maximal Cauchy development in the energy class. We then repeatedly analyse the stress-energy tensor of this development (as in \\cite{tao:forges}) to extract either a self-similar, travelling, or degenerate non-trivial energy class solution to the wave maps equation. We will then rule out such solutions in the sequels to this paper, establishing the desired global regularity result for wave maps.

Tao, Terence

2008-01-01T23:59:59.000Z

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.


301

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

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

302

University of California Policy G-28 Travel Regulations  

E-Print Network [OSTI]

with work done within the scope of the UC/DOE contract for the management and operations of the Lawrence. Travel Management Services ................................................... 6 1. Travel Management

Ishida, Yuko

303

DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse...  

Energy Savers [EERE]

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 -...

304

Secretary Moniz Announces Travel to Chicago, North Dakota, New...  

Energy Savers [EERE]

Travel to Chicago, North Dakota, New Mexico for Quadrennial Energy Review Secretary Moniz Announces Travel to Chicago, North Dakota, New Mexico for Quadrennial Energy Review August...

305

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

306

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

307

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

SciTech Connect (OSTI)

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

308

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

309

Hotel and Travel Information for the Summit  

Broader source: Energy.gov [DOE]

The Executive Summit on Wind Research and Development is being held at the Clemson University SCE&G Energy and Innovation Center. Here registrants can find summit hotel and travel information...

310

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.

311

The domestic travel sector in China  

E-Print Network [OSTI]

China is already the largest domestic tourism market in the world. Chinese citizens made as many as 800 million overnight domestic trips in 2005. While travel is not a new concept in China, the disposable income they wield, ...

Anders, Jeff, M.B.A. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

312

CE 469 / 569 TRAVEL DEMAND MODELING Spring 2006 Course Syllabus  

E-Print Network [OSTI]

of travel demand data, and should apply these methods to estimating and to forecasting travel demand these to practical modeling scenarios. The student should also use existing computer tools to forecast travel demand1 CE 469 / 569 TRAVEL DEMAND MODELING Spring 2006 Course Syllabus Catalog Detailed investigation

Hickman, Mark

313

Electron dynamics in surface acoustic wave devices  

E-Print Network [OSTI]

-dimensional nanostructures one can create a series of dynamic quantum dots corresponding to the minima of the travelling electric wave, and each dot carries a single electron at the SAW velocity (? 2800 m/s). These devices may be of use in developing future quantum...

Thorn, Adam Leslie

2009-10-13T23:59:59.000Z

314

Wave-wave interactions in solar type III radio bursts  

SciTech Connect (OSTI)

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

315

Impulsive waves in de Sitter and anti-de Sitter space-times generated by null particles with an arbitrary multipole structure  

E-Print Network [OSTI]

We describe a class of impulsive gravitational waves which propagate either in a de Sitter or an anti-de Sitter background. They are conformal to impulsive waves of Kundt's class. In a background with positive cosmological constant they are spherical (but non-expanding) waves generated by pairs of particles with arbitrary multipole structure propagating in opposite directions. When the cosmological constant is negative, they are hyperboloidal waves generated by a null particle of the same type. In this case, they are included in the impulsive limit of a class of solutions described by Siklos that are conformal to pp-waves.

J Podolsky; J B Griffiths

1997-10-08T23:59:59.000Z

316

Sub-nanosecond time-resolved ambient-pressure X-ray photoelectron spectroscopy setup for pulsed and constant wave X-ray light sources  

SciTech Connect (OSTI)

An apparatus for sub-nanosecond time-resolved ambient-pressure X-ray photoelectron spectroscopy studies with pulsed and constant wave X-ray light sources is presented. A differentially pumped hemispherical electron analyzer is equipped with a delay-line detector that simultaneously records the position and arrival time of every single electron at the exit aperture of the hemisphere with ?0.1 mm spatial resolution and ?150 ps temporal accuracy. The kinetic energies of the photoelectrons are encoded in the hit positions along the dispersive axis of the two-dimensional detector. Pump-probe time-delays are provided by the electron arrival times relative to the pump pulse timing. An average time-resolution of (780 ± 20) ps (FWHM) is demonstrated for a hemisphere pass energy E{sub p} = 150 eV and an electron kinetic energy range KE = 503–508 eV. The time-resolution of the setup is limited by the electron time-of-flight (TOF) spread related to the electron trajectory distribution within the analyzer hemisphere and within the electrostatic lens system that images the interaction volume onto the hemisphere entrance slit. The TOF spread for electrons with KE = 430 eV varies between ?9 ns at a pass energy of 50 eV and ?1 ns at pass energies between 200 eV and 400 eV. The correlation between the retarding ratio and the TOF spread is evaluated by means of both analytical descriptions of the electron trajectories within the analyzer hemisphere and computer simulations of the entire trajectories including the electrostatic lens system. In agreement with previous studies, we find that the by far dominant contribution to the TOF spread is acquired within the hemisphere. However, both experiment and computer simulations show that the lens system indirectly affects the time resolution of the setup to a significant extent by inducing a strong dependence of the angular spread of electron trajectories entering the hemisphere on the retarding ratio. The scaling of the angular spread with the retarding ratio can be well approximated by applying Liouville's theorem of constant emittance to the electron trajectories inside the lens system. The performance of the setup is demonstrated by characterizing the laser fluence-dependent transient surface photovoltage response of a laser-excited Si(100) sample.

Shavorskiy, Andrey; Slaughter, Daniel S.; Zegkinoglou, Ioannis; Rude, Bruce S.; Bluhm, Hendrik [Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Neppl, Stefan; Cryan, James P.; Siefermann, Katrin R.; Weise, Fabian; Lin, Ming-Fu; Bacellar, Camila; Ziemkiewicz, Michael P.; Fraund, Matthew W.; Khurmi, Champak; Wright, Travis W.; Schoenlein, Robert W.; Gessner, Oliver, E-mail: ogessner@lbl.gov [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Hertlein, Marcus P.; Tyliszczak, Tolek [Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Huse, Nils [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Physics Department, University of Hamburg and Max-Planck Institute for Structure and Dynamics of Matter, 22761 Hamburg (Germany); and others

2014-09-15T23:59:59.000Z

317

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

318

2011 Waves -1 STANDING WAVES  

E-Print Network [OSTI]

2011 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 the differences between transverse and longitudinal waves. APPARATUS: Buzzer board with string, meter stick

Glashausser, Charles

319

Physics 5B Winter 2009 Rate of Energy Transfer by Sinusoidal Waves on a String  

E-Print Network [OSTI]

, Vibrations and Waves (W.W. Norton and Company, New York, 1971). First, we compute the kinetic energyPhysics 5B Winter 2009 Rate of Energy Transfer by Sinusoidal Waves on a String Consider the kinetic energy and the potential energy of this string segment due to the passage of a traveling wave

California at Santa Cruz, University of

320

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.

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

Online Submission ID: 0594 Sound Propagation in Large Complex Environments Using Wave-Ray Coupling  

E-Print Network [OSTI]

Online Submission ID: 0594 Sound Propagation in Large Complex Environments Using Wave-Ray Coupling-3 cal acoustic techniques for sound propagation that computes how4 sound waves travel in space reducing the overall computation.19 1 Introduction20 Sound propagation techniques determine how sound waves

North Carolina at Chapel Hill, University of

322

Online Submission ID: 0301 Wave-Ray Coupling for Interactive Sound Propagation in Large Complex Scenes  

E-Print Network [OSTI]

Online Submission ID: 0301 Wave-Ray Coupling for Interactive Sound Propagation in Large Complex numerical techniques.18 1 Introduction19 Sound propagation techniques are used to model how sound waves20 applications use geometric sound propagation40 techniques, which assume that sound waves travels like rays

North Carolina at Chapel Hill, University of

323

The Effect of Surface Wave Propagation on Neural Responses to Vibration in Primate Glabrous Skin  

E-Print Network [OSTI]

The Effect of Surface Wave Propagation on Neural Responses to Vibration in Primate Glabrous Skin preserved as it travels across the skin. Our results suggest, then, that the propagation of surface waves of Surface Wave Propagation on Neural Responses to Vibration in Primate Glabrous Skin. PLoS ONE 7(2): e31203

Elias, Damian Octavio

324

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

325

Transferring 2001 National Household Travel Survey  

SciTech Connect (OSTI)

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

326

A tapering window for time-domain templates and simulated signals in the detection of gravitational waves from coalescing compact binaries  

E-Print Network [OSTI]

Inspiral signals from binary black holes, in particular those with masses in the range $10M_\\odot \\lsim M \\lsim 1000 M_\\odot,$ may last for only a few cycles within a detector's most sensitive frequency band. The spectrum of a square-windowed time-domain signal could contain unwanted power that can cause problems in gravitational wave data analysis, particularly when the waveforms are of short duration. There may be leakage of power into frequency bins where no such power is expected, causing an excess of false alarms. We present a method of tapering the time-domain waveforms that significantly reduces unwanted leakage of power, leading to a spectrum that agrees very well with that of a long duration signal. Our tapered window also decreases the false alarms caused by instrumental and environmental transients that are picked up by templates with spurious signal power. The suppression of background is an important goal in noise-dominated searches and can lead to an improvement in the detection efficiency of the search algorithms.

D. J. A. McKechan; C. Robinson; B. S. Sathyaprakash

2010-03-15T23:59:59.000Z

327

Directed Relativistic Blast Wave  

E-Print Network [OSTI]

A spherically symmetrical ultra-relativistic blast wave is not an attractor of a generic asymmetric explosion. Spherical symmetry is reached only by the time the blast wave slows down to non-relativistic velocities, when the Sedov-Taylor-von Neumann attractor solution sets in. We show however, that a directed relativistic explosion, with the explosion momentum close to the explosion energy, produces a blast wave with a universal intermediate asymptotic -- a selfsimilar directed ultra-relativistic blast wave. This universality might be of interest for the astrophysics of gamma-ray burst afterglows.

Andrei Gruzinov

2007-04-23T23:59:59.000Z

328

Robust Inventory Routing with Flexible Time Window Allocation  

E-Print Network [OSTI]

Jan 15, 2015 ... Abstract: This paper studies a robust maritime inventory routing problem with time windows and stochastic travel times. One of the novelties of ...

Chengliang Zhang

2015-01-15T23:59:59.000Z

329

A review of "An Intrepid Scott: William Lithgow of Lanark's Travels in the Ottoman Lands, North Africa, and Central Europe, 1609 - 21" by Clifford Edmund Bosworth  

E-Print Network [OSTI]

most appropriately be found in Friends? meeting houses, rather than on the shelves of university libraries. Clifford Edmund Bosworth. An Intrepid Scot: William Lithgow of Lanark?s Travels in the Ottoman Lands, North Africa, and Central Europe, 1609... and often alone, visited continental Europe and the Mediter- ranean rim, and upon returning to Britain, published narratives of their ad- ventures. These travelers were not unusual because they traveled?many En- glish and Scots men did so at the time...

Aune, M. G.

2008-01-01T23:59:59.000Z

330

RESEARCH ARTICLE Open Access Travelling in time with networks: Revealing  

E-Print Network [OSTI]

algae Fucus spiralis and F. vesiculosus. Individual-centered networks were analyzed on the basis and emphasized the reliability of network analysis to unravel and study hybridization Background Speciation in the initiation and maintenance of divergence can then be inferred. Understanding the complexity of evolutionary

Teixeira, Sara

331

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

332

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

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassiveSubmittedStatusButlerTransportation From modeling andTransuranic

333

Supplemental Guidance Regarding Compensatory Time Off for Travel |  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of Energy Strain Rate4Superhard CoatingNovember 15, 2001Marchthe

334

activity-based travel demand: Topics by E-print Network  

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

and Dissertations Summary: ??Travel demand Management (TDM) focuses on improving the efficiency of the transportation system through changing traveler's travel behavior rather than...

335

Cycloidal Wave Energy Converter  

SciTech Connect (OSTI)

This program allowed further advancing the development of a novel type of wave energy converter, a Cycloidal Wave Energy Converter or CycWEC. A CycWEC consists of one or more hydrofoils rotating around a central shaft, and operates fully submerged beneath the water surface. It operates under feedback control sensing the incoming waves, and converts wave power to shaft power directly without any intermediate power take off system. Previous research consisting of numerical simulations and two dimensional small 1:300 scale wave flume experiments had indicated wave cancellation efficiencies beyond 95%. The present work was centered on construction and testing of a 1:10 scale model and conducting two testing campaigns in a three dimensional wave basin. These experiments allowed for the first time for direct measurement of electrical power generated as well as the interaction of the CycWEC in a three dimensional environment. The Atargis team successfully conducted two testing campaigns at the Texas A&M Offshore Technology Research Center and was able to demonstrate electricity generation. In addition, three dimensional wave diffraction results show the ability to achieve wave focusing, thus increasing the amount of wave power that can be extracted beyond what was expected from earlier two dimensional investigations. Numerical results showed wave cancellation efficiencies for irregular waves to be on par with results for regular waves over a wide range of wave lengths. Using the results from previous simulations and experiments a full scale prototype was designed and its performance in a North Atlantic wave climate of average 30kW/m of wave crest was estimated. A full scale WEC with a blade span of 150m will deliver a design power of 5MW at an estimated levelized cost of energy (LCOE) in the range of 10-17 US cents per kWh. Based on the new results achieved in the 1:10 scale experiments these estimates appear conservative and the likely performance at full scale will exceed this initial performance estimates. In advancing the Technology Readiness Level (TRL) of this type of wave energy converter from 3 to 4, we find the CycWEC to exceed our initial estimates in terms of hydrodynamic performance. Once fully developed and optimized, it has the potential to not just outperform all other WEC technologies, but to also deliver power at a lower LCOE than competing conventional renewables like wind and solar. Given the large wave power resource both domestically and internationally, this technology has the potential to lead to a large improvement in our ability to produce clean electricity at affordable cost.

Stefan G. Siegel, Ph.D.

2012-11-30T23:59:59.000Z

336

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

337

University of Bath TRAVEL PLAN: FULL REPORT  

E-Print Network [OSTI]

of travel, and encourage more efficient use of private vehicles through a car sharing scheme. 1.4. The aims in an absolute reduction in the number of car movements associated with the campus, even though staff and student emissions. Breaking this down, the key contributors were staff commuting by private car (36%), international

Burton, Geoffrey R.

338

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

339

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

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

Have You Seen Renewable Energy Projects While Traveling? | Department...  

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

Have You 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...

342

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 control measure. #12;RESIDENTIAL LOCATION CHOICE AND TRAVEL BEHAVIOR: IMPLICATIONS FOR AIR QUALITY.......................................................... 3 2.2 The Role of Residential Location Choice

Levinson, David M.

343

An Optimal Path Model for the Risk-Averse Traveler  

E-Print Network [OSTI]

Jun 11, 2014 ... The model is suitable for a risk-averse traveler, who prefers a path with ... Citation

Leilei Zhang

2014-06-11T23:59:59.000Z

344

University of Massachusetts Amherst Pre-Travel Authorization  

E-Print Network [OSTI]

University of Massachusetts Amherst Pre-Travel Authorization All University travel across all funding sources requires supervisory and funding administrator approval prior to confirming travel OF TRIP: OTHER COMMENTS: (Importance of trip/consequences if not funded, coverage of duties while absent

Massachusetts at Amherst, University of

345

Business and Travel Expense Policy Effective February 1, 2013  

E-Print Network [OSTI]

Business and Travel Expense Policy Effective February 1, 2013 Updated April 4, 2014 1 BUSINESS" and "Business Expense" #12;Business and Travel Expense Policy Effective February 1, 2013 Updated April 4, 2014 2 STEVENS INSTITUTE OF TECHNOLOGY BUSINESS AND TRAVEL EXPENSE POLICY TABLE OF CONTENTS TABLE OF CONTENTS

Yang, Eui-Hyeok

346

GyPSuM: A Detailed Tomographic Model of Mantle Density and Seismic Wave Speeds  

SciTech Connect (OSTI)

GyPSuM is a tomographic model fo mantle seismic shear wave (S) speeds, compressional wave (P) speeds and detailed density anomalies that drive mantle flow. the model is developed through simultaneous inversion of seismic body wave travel times (P and S) and geodynamic observations while considering realistic mineral physics parameters linking the relative behavior of mantle properties (wave speeds and density). Geodynamic observations include the (up to degree 16) global free-air gravity field, divergence of the tectonic plates, dynamic topography of the free surface, and the flow-induced excess ellipticity of the core-mantle boundary. GyPSuM is built with the philosophy that heterogeneity that most closely resembles thermal variations is the simplest possible solution. Models of the density field from Earth's free oscillations have provided great insight into the density configuration of the mantle; but are limited to very long-wavelength solutions. Alternatively, simply scaling higher resolution seismic images to density anomalies generates density fields that do not satisfy geodynamic observations. The current study provides detailed density structures in the mantle while directly satisfying geodynamic observations through a joint seismic-geodynamic inversion process. Notable density field observations include high-density piles at the base of the superplume structures, supporting the fundamental results of past normal mode studies. However, these features are more localized and lower amplitude than past studies would suggest. When we consider all seismic anomalies in GyPSuM, we find that P and S-wave speeds are strongly correlated throughout the mantle. However, correlations between the high-velocity S zones in the deep mantle ({approx} 2000 km depth) and corresponding P-wave anomalies are very low suggesting a systematic divergence from simplified thermal effects in ancient subducted slab anomalies. Nevertheless, they argue that temperature variations are the primary cause of P-wave, S-wave, and density anomalies in the mantle.

Simmons, N A; Forte, A M; Boschi, L; Grand, S P

2010-03-30T23:59:59.000Z

347

Target waves in the complex Ginzburg-Landau equation Matthew Hendrey, Keeyeol Nam, Parvez Guzdar,* and Edward Ott  

E-Print Network [OSTI]

Target waves in the complex Ginzburg-Landau equation Matthew Hendrey, Keeyeol Nam, Parvez Guzdar Ginzburg-Landau equa- tion. We observe that this can produce two types of target wave patterns: stationary propagating periodic traveling wave. In the breathing case, however, the region in the vicinity of the target

Rubloff, Gary W.

348

The Sorcerer's Apprentices I have travelled extensively in Europe teaching engineers for the last 10 years  

E-Print Network [OSTI]

The Sorcerer's Apprentices I have travelled extensively in Europe teaching engineers for the last. At the same time, the notion of having apprentices to such engineers also makes real sense in IT. Because necessary in rapidly evolving subjects. IT is one of them. Sometimes, the apprentices surpass their masters

Hatton, Les

349

Greening North Carolina Travel and Tourism Tips for Sustainable Practices in Tourism  

E-Print Network [OSTI]

Energy Efficient Light Bulbs Can Still Be Inefficient Led Lights Time Has Come N.C. GreenTravel *NC *Don't have recycling bins? There's help for that Recycling Recycling, the Typical Starting Point The Challenges of Recycling Getting Your Recycling Program into Shape What Can be Recycled Recycling at Work

350

Modal shifts in short-haul passenger travel and the consequent energy impacts. [Intercity travel under 500 miles  

SciTech Connect (OSTI)

A study was performed to evaluate the impacts of strategies to effect modal shifts in short-haul passenger travel (defined herein as intercity travel under 500 miles) from energy-intensive modes to those modes that are less energy-intensive. A series of individual strategies, ranging from incentives to the less energy-intensive modes (bus, rail) to penalties to the more energy-intensive modes (auto, air) was examined to determine energy saved and policy implications relative to strategy implementation. The most effective of the individual strategies were then combined in all permutations, and the analysis was repeated. As part of the analytical process, effects of factors other than energy (user cost and time, emissions, government subsidy, and travel fatailities) were examined in a benefit/cost analysis. Finally, energy savings, benefit/cost impacts, implementation considerations, and policy implications were evaluated to arrive at conclusions as to the effectiveness of the more-influential strategies and to the overall effectiveness of induced modal shifts. The principal conclusion of the study is that the maximum 1980 energy saving that might be realized by modal shifts, discounting the concurrent effects of demand suppression and improvement of mode efficiency, is approximately 83 x 10/sup 12/ Btu (46,500 bbl gasoline per day), 3.8% of the total projected 1980 energy consumption in the short-haul transportation sector and 0.23% of the total US petroleum use. It was also concluded that strategies to achieve these small savings by modal shifts would result in significant economic, social, and business disruptions.

Not Available

1980-03-01T23:59:59.000Z

351

University of Michigan Pre-Departure Checklist for Students Traveling Abroad  

E-Print Network [OSTI]

Insurance 734-764-5182 or email mancarestuins@umich.edu. University Travel Warning and Travel Restriction

Eustice, Ryan

352

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

353

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

354

Interaction for solitary waves in coasting charged particle beams  

SciTech Connect (OSTI)

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

355

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

SciTech Connect (OSTI)

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

356

Page 1 of 3 last updated: 9-Nov-11 I. WASHINGTON UNIVERSITY IN ST. LOUIS INTERNATIONAL TRAVEL POLICY  

E-Print Network [OSTI]

-essential travel to the country; 2) The travel assistance organization International SOS IN ST. LOUIS INTERNATIONAL TRAVEL POLICY The Washington University International Travel Policy has been adopted to ensure a consistent set of travel standards

Subramanian, Venkat

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

Guidelines in Wave Energy Conversion System Design  

E-Print Network [OSTI]

absorber systems are used in arrays, where multiple devices are attached in series or parallel to capture more energy. Point absorbers can be used offshore in various depths of water. Submerged Pressure Differentials SPDs are completely submerged... that they can capture the most effective bending motion. Most attenuators are used near shore, but there are some designs that could be used further offshore. Attenuators need to be positioned parallel with the wave direction of travel in order to capture...

Guiberteau, K. L.; Liu, Y.; Lee, J.; Kozman, T.

2014-01-01T23:59:59.000Z

359

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

360

Topeka's "Green Light Tunnel" Saves Fuel and Time | Department...  

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

The result is fewer stops, less travel time and -- most importantly -- a lot of saved gasoline. Sallie Glaize Project Officer, Office of Energy Efficiency & Renewable Energy What...

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

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

SciTech Connect (OSTI)

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

362

On the impossibility of superluminal travel in Lorentz violating theories  

E-Print Network [OSTI]

Warp drives are space-times allowing for superluminal travel. However, they are quantum mechanically unstable because they produce a Hawking-like radiation which is blue shifted at their front wall without any bound. We re-examine this instability when local Lorentz invariance is violated at ultra high energy by dispersion, as in some theories of quantum gravity. Interestingly, even though the ultraviolet divergence is now regulated, warp drives are still unstable. Moreover the type of instability is different whether one uses a subluminal or a superluminal dispersion relation. In the first case, a black-hole laser yields an exponential amplification of the emitted flux whereas, in the second, infrared effects produce a linear growth of that flux. These results suggest that chronology could still be protected when violating Lorentz invariance.

Coutant, Antonin; Liberati, Stefano; Parentani, Renaud

2011-01-01T23:59:59.000Z

363

Venue and Travel | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism inS-4500IIVasudha Patri MechanicalofVehicles -winsVenue and Travel

364

Traveling Expense Deductions for Corporations and Individuals  

E-Print Network [OSTI]

" requirement is Chandler versus Cosmdssicrer. 7 Douglas A. Chandler vas employed as a high school principal by the city of Attleboro~ t~assachnsetts~ where he lived. Two nights a veek, hs drove thirty seven miles to Boston University uhsre he conducted... night classes, Bis duties in Boston cid not require him to be avsy from Attleboro overnight~ and on no occasion did he remain overnight in Boston, Chandler attempted to deduct f534 as traveling expenses betueen his home and Boston~ and vas denied...

Lee, Billy West

1960-01-01T23:59:59.000Z

365

Fermilab | Tevatron | Tevatron Symposium | Travel and Lodging  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-Series toESnet4:EpitaxialtransatlanticUnified Forces | DoTravel and Lodging

366

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

367

GRADUATE STUDENT INTERNATIONAL TRAVEL NOTIFICATION | Page 1 of 3 GRADUATE STUDENT INTERNATIONAL TRAVEL NOTIFICATION  

E-Print Network [OSTI]

trip abroad that is related to your graduate study. If you are traveling for academic purposes to any subjects, transportation of OU resources (including university laptop computers), defense articles) Academic Dept.: Academic Advisor: Local Address: Permanent Address: PASSPORT INFORMATION: Name (as

Droegemeier, Kelvin K.

368

www.admin.cam.ac.uk/offices/em/travel What is Travel for Work?  

E-Print Network [OSTI]

· Zipcar car club · Park & Cycle · Loans for cycle equipment or train/bus tickets · Car sharing scheme? · Discounts on season tickets and cycling equipment · Petrol cost savings through promoted car-sharing system must also respond to pressures to manage car parking and the demand for travel by car in favour

Travis, Adrian

369

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...

370

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

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

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...

371

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

372

A Randomized Rounding Approach to the Traveling Salesman Problem  

E-Print Network [OSTI]

A Randomized Rounding Approach to the Traveling Salesman Problem Shayan Oveis Gharan Amin Saberi. Department of Management Science and Engineering, Stanford University. Email:saberi@stanford.edu School

Saberi, Amin

373

Travel Support for Attendance to Kruger 2010 Workshop  

SciTech Connect (OSTI)

This award was for travel support only for the conference. There are 127 authors whose names can be accessed on the website above.

Vickey, Trevor

2010-12-05T23:59:59.000Z

374

advanced traveler information: Topics by E-print Network  

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

its Heller, Barbara 422 University of Bath Travel Plan Mathematics Websites Summary: of car sharing, public transport, cycling or walking". 1.4 We are continuously seeking ways...

375

address travel medicine: Topics by E-print Network  

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

its Heller, Barbara 211 University of Bath Travel Plan Mathematics Websites Summary: of car sharing, public transport, cycling or walking". 1.4 We are continuously seeking ways...

376

Petroleum Reduction Strategies to Reduce Vehicle Miles Traveled  

Broader source: Energy.gov [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.

377

ORISE: Travelers' Health Campaign | How ORISE is Making a Difference  

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

The CDC is also partnering with local health departments, travel professionals, health care professionals, and colleges and universities to further educate the public. "I...

378

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

379

WAVE HEIGHTS IN A 4D OCEAN WAVE FIELD Paul C. Liu  

E-Print Network [OSTI]

WAVE HEIGHTS IN A 4D OCEAN WAVE FIELD Paul C. Liu NOAA Great Lakes Environmental Research a preliminary examination and analysis of a small suite of 4-D wave data to explore what new insight century. We feel it is timely to encourage further 4-D ocean wave measurement and thereby facilitate fresh

380

Wave propagation in a FitzHugh-Nagumo-type model with modified excitability E. P. Zemskov1,2,* and I. R. Epstein1,  

E-Print Network [OSTI]

Wave propagation in a FitzHugh-Nagumo-type model with modified excitability E. P. Zemskov1 I. INTRODUCTION Wave propagation and pattern formation in a variety of excitable media can-Lecar equations for neuronal activity. We obtain exact analytic solutions in the form of traveling waves using

Epstein, Irving R.

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

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

382

IR Hot Wave  

SciTech Connect (OSTI)

The IR Hot Wave{trademark} furnace is a breakthrough heat treatment system for manufacturing metal components. Near-infrared (IR) radiant energy combines with IR convective heating for heat treating. Heat treatment is an essential process in the manufacture of most components. The controlled heating and cooling of a metal or metal alloy alters its physical, mechanical, and sometimes chemical properties without changing the object's shape. The IR Hot Wave{trademark} furnace offers the simplest, quickest, most efficient, and cost-effective heat treatment option for metals and metal alloys. Compared with other heat treatment alternatives, the IR Hot Wave{trademark} system: (1) is 3 to 15 times faster; (2) is 2 to 3 times more energy efficient; (3) is 20% to 50% more cost-effective; (4) has a {+-}1 C thermal profile compared to a {+-}10 C thermal profile for conventional gas furnaces; and (5) has a 25% to 50% smaller footprint.

Graham, T. B.

2010-04-01T23:59:59.000Z

383

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

SciTech Connect (OSTI)

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

384

UNALLOWABLE EXPENSES Some common unallowable TRAVEL expenses on University  

E-Print Network [OSTI]

UNALLOWABLE EXPENSES Some common unallowable TRAVEL expenses on University funds include: 4Alcohol from University funds for spouses, family or friends accompanying you. Any contracted State provisions://busfin.colostate.edu/trv.aspx #12;GENERAL RULE Travel charged to the University, regardless of the funding source, shall

385

STAFF TRAVEL SURVEY 2006 KEY FINDINGS Survey introduction  

E-Print Network [OSTI]

routes. · Car users are most likely to be encouraged to car share if help is given in finding suitable car sharing partners. How do you usually travel to work? Almost half of all staff (46%) drive to work alone. Another 23% car share, giving a total of 70% staff using a car to travel to work. Comparing

Brierley, Andrew

386

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

387

Tips for Travelers When State Funds Are Used University of Kansas Procurement Services Tips for Travelers When State Funds Are Used  

E-Print Network [OSTI]

Tips for Travelers When State Funds Are Used University of Kansas Procurement Services ­Tips for Travelers When State Funds Are Used Updated 02/17/14 Travel and Expense All or a portion of your trip will be paid for with state funds. This tip sheet is designed to help with common travel expenses to speed

388

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

389

TRAVEL ACCIDENT INSURANCE PLAN 01-01-2012 The Travel Accident Insurance Plan provides 24-hour Accident coverage while on Authorized  

E-Print Network [OSTI]

1 TRAVEL ACCIDENT INSURANCE PLAN 01-01-2012 The Travel Accident Insurance Plan provides 24-hour Accident coverage while on Authorized Business Travel. Coverage begins at the actual starting point. Please note that the Employer reserves the right to amend or terminate this Travel Accident Insurance

Johnson, Peter D.

390

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

SciTech Connect (OSTI)

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

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

1986 -1996 TRAVEL TRENDS IN THE1986 -1996 TRAVEL TRENDS IN THE GTA & HAMILTON-WENTWORTHGTA & HAMILTON-WENTWORTH  

E-Print Network [OSTI]

1986 - 1996 TRAVEL TRENDS IN THE1986 - 1996 TRAVEL TRENDS IN THE GTA & HAMILTON-WENTWORTHGTA & HAMILTON-WENTWORTH Data Management Group Joint Program in Transportation University of Toronto March 1998 STRUCTURE OF HAMILTON-WENTWORTH ........13 EXHIBIT 8A ­ 1996 TRANSIT TRIP RATES BY GENDER FOR TORONTO

Toronto, University of

393

http://travel.state.gov/travel/about/who/who_1245.html AT THE SCENE OF AN ACCIDENT FORM  

E-Print Network [OSTI]

http://travel.state.gov/travel/about/who/who_1245.html AT THE SCENE OF AN ACCIDENT FORM AT THE SCENE, FILL OUT THE BELOW INFORMATION ORS 811.700 REQUIRES DRIVERS INVOLVED IN AN ACCIDENT TO EXCHANGE-737-7252 or risk@oregonstate.edu IMMEDIATELY if this was a serious accident (i.e. ambulance involved, vehicle towed

Tullos, Desiree

394

NAVPGSCOL INSTRUCTION 4650.4J Subj: POLICY FOR OFFICIAL TRAVEL PERFORMED BY NAVAL  

E-Print Network [OSTI]

) NAVSUPINST 4200.99 Encl: (1) Naval Postgraduate School Temporary Additional Duty (TAD) Travel Policy. Background a. NPS uses the Defense Travel System (DTS) to administer Temporary Additional Duty (TAD) travel

395

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

396

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

SciTech Connect (OSTI)

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

397

Visualizing the kinematics of relativistic wave packets  

E-Print Network [OSTI]

This article investigates some solutions of the time-dependent free Dirac equation. Visualizations of these solutions immediately reveal strange phenomena that are caused by the interference of positive- and negative-energy waves. The effects discussed here include the Zitterbewegung, the opposite direction of momentum and velocity in negative-energy wave packets, and the superluminal propagation of the wave packet's local maxima.

Bernd Thaller

2004-09-14T23:59:59.000Z

398

Autoresonance of coupled nonlinear waves L. Friedland  

E-Print Network [OSTI]

wave train solutions of the decoupled problem. At the same time, the waves are globally phase locked, allowing the continuation of the phase locking between the waves despite the variation of system's param and sustaining this multidimensional autoresonance are the internal reso- nant excitation of one of the coupled

Friedland, Lazar

399

The thin section rock physics: Modeling and measurement of seismic wave velocity on the slice of carbonates  

SciTech Connect (OSTI)

This paper discusses a new approach for investigating the seismic wave velocity of rock, specifically carbonates, as affected by their pore structures. While the conventional routine of seismic velocity measurement highly depends on the extensive laboratory experiment, the proposed approach utilizes the digital rock physics view which lies on the numerical experiment. Thus, instead of using core sample, we use the thin section image of carbonate rock to measure the effective seismic wave velocity when travelling on it. In the numerical experiment, thin section images act as the medium on which wave propagation will be simulated. For the modeling, an advanced technique based on artificial neural network was employed for building the velocity and density profile, replacing image's RGB pixel value with the seismic velocity and density of each rock constituent. Then, ultrasonic wave was simulated to propagate in the thin section image by using finite difference time domain method, based on assumption of an acoustic-isotropic medium. Effective velocities were drawn from the recorded signal and being compared to the velocity modeling from Wyllie time average model and Kuster-Toksoz rock physics model. To perform the modeling, image analysis routines were undertaken for quantifying the pore aspect ratio that is assumed to represent the rocks pore structure. In addition, porosity and mineral fraction required for velocity modeling were also quantified by using integrated neural network and image analysis technique. It was found that the Kuster-Toksoz gives the closer prediction to the measured velocity as compared to the Wyllie time average model. We also conclude that Wyllie time average that does not incorporate the pore structure parameter deviates significantly for samples having more than 40% porosity. Utilizing this approach we found a good agreement between numerical experiment and theoretically derived rock physics model for estimating the effective seismic wave velocity of rock.

Wardaya, P. D., E-mail: pongga.wardaya@utp.edu.my; Noh, K. A. B. M., E-mail: pongga.wardaya@utp.edu.my; Yusoff, W. I. B. W., E-mail: pongga.wardaya@utp.edu.my [Petroleum Geosciences Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750 (Malaysia); Ridha, S. [Petroleum Engineering Department, Universiti Teknologi PETRONAS, Tronoh, Perak, 31750 (Malaysia); Nurhandoko, B. E. B. [Wave Inversion and Subsurface Fluid Imaging Research Laboratory (WISFIR), Dept. of Physics, Institute of Technology Bandung, Bandung, Indonesia and Rock Fluid Imaging Lab, Bandung (Indonesia)

2014-09-25T23:59:59.000Z

400

Estimate Costs to Implement Greenhouse Gas Mitigation Strategies for Business Travel  

Broader source: Energy.gov [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 - automobile travel Sample Search Results  

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

402

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

403

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

404

Matter Wave Radiation Leading to Matter Teleportation  

E-Print Network [OSTI]

The concept of matter wave radiation is put forward, and its equation is established for the first time. The formalism solution shows that the probability density is a function of displacement and time. A free particle and a two-level system are reinvestigated considering the effect of matter wave radiation. Three feasible experimental designs, especially a modified Stern-Gerlach setup, are proposed to verify the existence of matter wave radiation. Matter wave radiation effect in relativity has been formulated in only a raw formulae, which offers another explanation of Lamb shift. A possible mechanics of matter teleportation is predicted due to the effect of matter wave radiation.

Yong-Yi Huang

2015-02-12T23:59:59.000Z

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 is disclosed. 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. 6 figs.

Weiss, J.D.

1995-08-29T23:59:59.000Z

408

Derivation of site-specific relationships between hydraulic parameters and p-wave velocities based on hydraulic and seismic tomography  

SciTech Connect (OSTI)

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

409

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

410

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

411

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

412

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

413

ORISE: CDC Travelers' Health Team Receives Innovation Award for...  

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

on award-winning website redesign for the CDC How ORISE is Making a Difference The Communication and Education Team of the Travelers' Health Branch of the Centers for Disease...

414

Impact of videoconferencing on the demand for air travel  

E-Print Network [OSTI]

Videoconferencing is widely seen as the form of modern telecommunications having the largest potential to impact the growth of business air travel demand. Most existing studies focus on the substitutional effect of enhanced ...

Mette, Matthias

1995-01-01T23:59:59.000Z

415

Defining business strategy for development of travel and tourism industry  

E-Print Network [OSTI]

Many studies conducted on Travel and Tourism industry consider tourism an economic phenomenon. Providing a customer-satisfaction-based analysis, this thesis deals with both economic and social aspects. Economic data on ...

Davari, Dordaneh

2011-01-01T23:59:59.000Z

416

The Asymmetric Traveling Salesman Problem on Graphs with Bounded Genus  

E-Print Network [OSTI]

Saberi Abstract We give a constant factor approximation algorithm for the asymmetric traveling salesman:{shayan, saberi}@stanford.edu. 1 #12;Thin trees were first defined in the graph embedding literature in an attempt

Saberi, Amin

417

Measuring and modeling activity and travel well-being  

E-Print Network [OSTI]

This thesis develops methods for the measurement of activity and travel well-being and models for linking well-being and behavior. The hypotheses underlying this research are that (1) activities are planned to maintain or ...

Abou Zeid, Maya, 1979-

2009-01-01T23:59:59.000Z

418

U.S. Department of Energy Travel Manual  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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

419

U.S. Department of Energy Travel Manual  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

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

420

The Influence of Travelling Fires on a Concrete Frame   

E-Print Network [OSTI]

. Current structural fire design methods do not account for these types of fires. This paper applies a novel methodology for defining a family of possible heating regimes to a framed concrete structure using the concept of travelling fires. A finite...

Law, Angus; Stern-Gottfried, Jamie; Gillie, Martin; Rein, Guillermo

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.


421

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

422

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

423

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

424

The prediction of bus arrival time using Automatic Vehicle Location Systems data  

E-Print Network [OSTI]

2.4.4 Kalman Filtering Models ..................................................................22 2.4.5 Artificial Neural Network Models ....................................................22 2.5 BUS TRAVEL TIME PREDICTION...

Jeong, Ran Hee

2005-02-17T23:59:59.000Z

425

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

426

Wave-Based Sound Propagation for VR Applications Ravish Mehra  

E-Print Network [OSTI]

Wave-Based Sound Propagation for VR Applications Ravish Mehra University of North Carolina to state-of-the-art wave solvers, enabling real-time, wave-based sound propagation in scenes spanning propagation accurately, it is important to develop interactive wave-based propagation techniques. We present

North Carolina at Chapel Hill, University of

427

Optimal adaptive routing and traffic assignment in stochastic time-dependent networks  

E-Print Network [OSTI]

A stochastic time-dependent (STD) network is defined by treating all link travel times at all time periods as random variables, with possible time-wise and link-wise stochastic dependency. A routing policy is a decision ...

Gao, Song, 1976-

2005-01-01T23:59:59.000Z

428

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

429

Coda wave interferometry 1 Coda wave interferometry  

E-Print Network [OSTI]

Coda wave interferometry 1 Coda wave interferometry An interferometer is an instrument that is sensitive to the interference of two or more waves (optical or acoustic). For example, an optical interferometer uses two interfering light beams to measure small length changes. Coda wave interferometry

Snieder, Roel

430

Final Report Phase I Study to Characterize the Market Potential for Non-Motorized Travel  

SciTech Connect (OSTI)

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

431

Inversion of Scattered Waves for Material Properties in Fractured Rock  

SciTech Connect (OSTI)

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

432

Spatiotemporal measurement of surfactant distribution on gravity-capillary waves  

E-Print Network [OSTI]

Materials adsorbed to the surface of a fluid -- for instance, crude oil, biogenic slicks, or industrial/medical surfactants -- will move in response to surface waves. Due to the difficulty of non-invasive measurement of the spatial distribution of a molecular monolayer, little is known about the dynamics that couple the surface waves and the evolving density field. Here, we report measurements of the spatiotemporal dynamics of the density field of an insoluble surfactant driven by gravity-capillary waves in a shallow cylindrical container. Standing Faraday waves and traveling waves generated by the meniscus are superimposed to create a non-trivial surfactant density field. We measure both the height field of the surface using moir\\'e-imaging, and the density field of the surfactant via the fluorescence of NBD-tagged phosphatidylcholine, a lipid. Through phase-averaging stroboscopically-acquired images of the density field, we determine that the surfactant accumulates on the leading edge of the traveling menis...

Strickland, Stephen L; Daniels, Karen E

2015-01-01T23:59:59.000Z

433

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

434

Correlates of time spent walking and cycling to and from work: baseline results from the Commuting and Health in Cambridge study  

E-Print Network [OSTI]

-experimental cohort study of the effects of major transport infrastructural developments in Cambridge, UK. Methods Postal surveys were sent to adults who travel to work in Cambridge (n = 1582). Questions asked about travel modes and time spent travelling to and from...

Panter, Jenna; Griffin, Simon; Jones, Andrew; Mackett, Roger; Ogilvie, David

2011-11-10T23:59:59.000Z

435

Effect of traveling waves on Vortex-Induced Vibration of long flexible cylinders  

E-Print Network [OSTI]

Offshore marine risers and pipelines, exposed to ocean currents, are susceptible to Vortex-Induced Vibration (VIV). Accurate prediction of VIV is necessary for estimating the fatigue life as well as for taking corrective ...

Jaiswal, Vivek, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

436

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

437

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

438

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

439

Microscale fluid flow induced by thermoviscous expansion along a traveling wave  

E-Print Network [OSTI]

The thermal expansion of a fluid combined with a temperature-dependent viscosity introduces nonlinearities in the Navier-Stokes equations unrelated to the convective momentum current. The couplings generate the possibility for net fluid flow at the microscale controlled by external heating. This novel thermo-mechanical effect is investigated for a thin fluid chamber by a numerical solution of the Navier-Stokes equations and analytically by a perturbation expansion. A demonstration experiment confirms the basic mechanism and quantitatively validates our theoretical analysis.

Franz M. Weinert; Jonas A. Kraus; Thomas Franosch; Dieter Braun

2008-04-02T23:59:59.000Z

440

Orthogonally interdigitated shielded serpentine travelling wave cathode ray tube deflection structure  

DOE Patents [OSTI]

A new deflection structure which deflects a beam of charged particles, such as an electron beam, includes a serpentine set for transmitting a deflection field, and a shielding frame for housing the serpentine set. The serpentine set includes a vertical serpentine deflection element and a horizontal serpentine deflection element. These deflection elements are identical, and are interdigitatedly and orthogonally disposed relative to each other, for forming a central transmission passage, through which the electron beam passes, and is deflected by the deflection field, so as to minimize drift space signal distortion. The shielding frame includes a plurality of ground blocks, and forms an internal serpentine trough within these ground blocks, for housing the serpentine set. The deflection structure further includes a plurality of feedthrough connectors which are inserted through the shielding frame, and which are electrically connected to the serpentine set. 10 figs.

Hagen, E.C.; Hudson, C.L.

1995-07-25T23:59:59.000Z

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

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

442

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

443

Microscale Fluid Flow Induced by Thermoviscous Expansion Along a Traveling Wave Franz M. Weinert,1  

E-Print Network [OSTI]

are negli- gible if the velocities are small with respect to the speed of sound, fluid flow is essentially confinement of a liquid changes its flow behavior markedly since the importance of surface forces relative a novel mechanism to generate net flow in a thin fluid chamber, i.e., a viscous liquid confined between

Kersting, Roland

444

Theory of the microelectronic traveling wave klystron amplifier with field-emission cathode array  

SciTech Connect (OSTI)

A nonlinear theory is developed to predict the gain of a distributed vacuum amplifier employed with field-emitter arrays. Contrary to conventional expectation, it is shown that density modulation of the electrons in the emitting structure is limited by high resistive losses and electronic damping. Therefore, a modified schematic is suggested with the high-frequency modulator separated from the emitter that only dc bias voltage is applied to. Small-signal calculation shows that 15-25 dB gain (with 3 dB bandwidth over 200 GHz) at 100-400 GHz frequency band can be obtained within 1-2 cm drift space length with currently available parameters of field emitters and microstrip transmission lines. Nonlinear calculations predict promising performances of good linearity and 13-20 dBm saturated output power. The suggested distributed vacuum amplifier fully based on microelectromechanical systems technologies would open a new era for the devices operating at the border of millimeter and submillimeter bands.

Ryskin, N. M.; Han, S. T.; Jang, K. H.; Park, G. S. [Saratov State University, Saratov, 410012 (Russian Federation); School of Physics and Astronomy, Seoul National University, 151-742 Seoul (Korea, Republic of)

2007-09-15T23:59:59.000Z

445

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.

446

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

447

Enhanced Features for Design of Traveling Wave Tubes Using CHRISTINE-1D  

E-Print Network [OSTI]

. These devices are critical for radar, communications and electronic warfare missions in the military, as well. They are critical for radar, communications and electronic warfare missions of all Armed Services, as well, and materials processing. The TWT amplifies by converting the kinetic energy of an electron beam

448

Orthogonally interdigitated shielded serpentine travelling wave cathod ray tube deflection structure  

SciTech Connect (OSTI)

This invention comprises a new deflection structure which deflects a beam of charged particles, such as an electron beam, includes a serpentine set for transmitting a deflection field, and shielding frame for housing the serpentine set. The serpentine set includes a vertical serpentine deflection element and a horizontal serpentine deflection element. These deflection elements are identical and are interdigitatedly and orthogonally disposed relative to each other, for forming a central transmission passage, through which the electron beam passes and is deflected by the deflection field to minimize drift space signal distortion. The shielding frame includes a plurality of ground blocks and forms an internal serpentine trough within these ground blocks for housing the serpentine set. The deflection structure further includes a plurality of feedthrough connectors which are inserted through the shielding frame and which are electrically connected to the serpentine set.

Hagen, E.C.; Hudson, C.L.

1993-10-27T23:59:59.000Z

449

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

450

Photoelastic study of acoustic wave propagation in grain Xavier Noblin, Guillaume Huillard and Jean Rajchenbach  

E-Print Network [OSTI]

Photoelastic study of acoustic wave propagation in grain packings Xavier Noblin, Guillaume Huillard. By means of photoelasticity, we success in visualizing in real time the propagation of acoustic waves case. Keywords: Granular material, mechanical wave propagation, photoelasticity, nonlinear behavior

Boyer, Edmond

451

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

452

The Symmetric Quadratic Traveling Salesman Problem  

E-Print Network [OSTI]

, e. g., if the succession of two edges represents energetic conformations, a change of direction new classes of polynomial time separable facet defining inequal- ities that exclude conflicting results are presented to illustrate the importance of the new inequalities. Keywords: combinatorial

453

Professional paper A chronology of freaque wave encounters  

E-Print Network [OSTI]

seafarers throughout the ages. After being ignored or dismissed for decades, freaque waves have now emerged of wave energy through time and space, through areas of variable surface ocean currents, and through

454

Responses of an articulated loading platform in waves and currents  

E-Print Network [OSTI]

The responses of an articulated loading platform (ALP) in regular and irregular unidirectional waves (with or without currents) are investigated both in frequency and time domain. The first- and second-order wave diffraction radiation are solved...

Ran, Zhihuang

1993-01-01T23:59:59.000Z

455

Smooth sandwich gravitational waves  

E-Print Network [OSTI]

Gravitational waves which are smooth and contain two asymptotically flat regions are constructed from the homogeneous pp-waves vacuum solution. Motion of free test particles is calculated explicitly and the limit to an impulsive wave is also considered.

J. Podolsky

1998-07-16T23:59:59.000Z

456

P-wave Indices to Detect Susceptibility to Atrial Fibrillation A Cabasson1  

E-Print Network [OSTI]

P-wave Indices to Detect Susceptibility to Atrial Fibrillation A Cabasson1 , L Dang2 , JM Vesin1 or not. In addition to stan- dard temporal P-wave parameters (P-wave duration and PQ interval), an index of P-wave stability over time defined as the Euclidean distance between beat-to-beat P waves

Boyer, Edmond

457

UNIVERSITY OF UTAH GRADUATE SCHOOL GRADUATE STUDENT TRAVEL ASSISTANCE APPLICATION  

E-Print Network [OSTI]

and must be supported with a dollar-for-dollar match from university funds. Matching support must be from university funding sources, e.g., development, operation, service, research, etc. One award only will be made37 ` UNIVERSITY OF UTAH ­ GRADUATE SCHOOL GRADUATE STUDENT TRAVEL ASSISTANCE APPLICATION

Simons, Jack

458

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

459

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

460

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

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

Travel directions to the Sterrekundig Instituut Utrecht (SIU) Street Address  

E-Print Network [OSTI]

Travel directions to the Sterrekundig Instituut Utrecht (SIU) Street Address Sterrekundig Instituut Utrecht Buijs Ballotlaboratorium Princetonplein 5 De Uithof Utrecht Telephone: 030­2535200 within Holland, a grocery store ("food market"), a large 24-hour Burger King, etc. Buy a paper railroad ticket to Utrecht

Rutten, Rob

462

If the internship is international or involves international travel, the  

E-Print Network [OSTI]

If the internship is international or involves international travel, the student does not need to complete the IRAMS student internship ap- plication, but should contact the Kennedy Center for internship approval and course registration. Flag will be removed, and students will be able to add their internship

Hart, Gus

463

If the internship is international or involves international travel, the  

E-Print Network [OSTI]

If the internship is international or involves international travel, the student does not need to complete the IRAMS student internship application, but should contact the Kennedy Center for internship approval and course registration. Flag will be removed, and students will be able to add their internship

Dahl, David B.

464

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

465

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

466

State Travel Management Program "Working Together To Serve Colorado"  

E-Print Network [OSTI]

17 th Street, Ste. 1520, Denver, CO 80202 / P: 303.866.3986 / C: 303.598.9617 / F: 303 purpose. C. to push or tow another vehicle unless the vehicle is equipped for towing and is specified. by an unlicensed driver. G. by a person other than an authorized Traveler with the minimum driver requirements. H

467

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

468

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

469

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

470

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

471

Globetoddler : enhancing the experience of remote interaction for preschool children and their traveling parents  

E-Print Network [OSTI]

In recent decades, families in the Western world have become more geographically distributed. Business traveling - the kind of traveling that tends to separate family members - is still a very common phenomenon and keeps ...

Modlitba, Lisa Paulina

2008-01-01T23:59:59.000Z

472

Driving and passengering: notes on the ordinary organisation of car travel   

E-Print Network [OSTI]

We spend ever increasing periods of our lives travelling in cars, yet quite what it is we do while travelling, aside from driving the vehicle itself, is largely overlooked. Drawing on analyses of video records of a series ...

Laurier, Eric; Lorimer, Hayden; Brown, Barry; Jones, Owain; Juhlin, Oskar; Noble, Allyson; Perry, Mark; Pica, Daniele; Sormani, Philippe; Strebel, Ignaz; Swan, Laurel; Taylor, Alex S; Watts, Laura; Weilenmann, Alexandra

2008-01-01T23:59:59.000Z

473

Energy Secretary Steven Chu to Travel to Bay Area to Highlight...  

Energy Savers [EERE]

Steven 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...

474

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

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

Engineering 10 February 2009 -This worksheet is an optional tool that may be used to help organize a traveler's pre-trip planning and subsequent entry into the eTravel System....

475

About International Cruise & Excursions International Cruise & Excursions, Inc. (ICE) is a worldwide travel and  

E-Print Network [OSTI]

About International Cruise & Excursions International Cruise & Excursions, Inc. (ICE corporations, resorts, cruise lines and leisure travel providers. ICE provides cruise and travel programs-commerce platform, state of the art call centers and customer service and fulfillment operations. Situation ICE

Fisher, Kathleen

476

Wave function derivation of the JIMWLK equation  

E-Print Network [OSTI]

Using the stationary lightcone perturbation theory, we propose the complete and careful derivation the JIMWLK equation. We show that the rigorous treatment requires the knowledge of a boosted wave function with second order accuracy. Previous wave function approaches are incomplete and implicitly used the time ordered perturbation theory, which requires a usage of an external target field.

Alexey V. Popov

2008-12-16T23:59:59.000Z

477

NERC Environmental Travel Policy 1. NERC recognises that, although travel is an essential part of our business  

E-Print Network [OSTI]

be justified. Sharing a car with fellow travellers is also important as is selecting the most appropriate hire vehicle. · Private car ­ only when hire car option is not viable and share whenever possible · Air, rail and public transport ­ the preferred choice for essential medium to long journeys; · Hire car

Brierley, Andrew

478

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

479

Sharp shock model for propagating detonation waves  

SciTech Connect (OSTI)

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

480

Rossby wave radiation by an eddy on the polar beta-plane  

E-Print Network [OSTI]

Results from the laboratory experiments on the evolution of vortices (eddies) generated in a rotating tank with topographic beta-effect are presented. The surface elevation and velocity fields are measured by the Altimetric Imaging Velocimetry. The experiments are supplemented by shallow water numerical simulations as well as a linear theory which describes the Rossby wave radiation by travelling vortices. The cyclonic vortices observed in the experiments travel to the northwest and continuously radiate Rossby waves. Measurements show that initially axisymmetric vortices develop a dipolar component which enables them to perform translational motion. A pattern of alternating zonal jets to the west of the vortex is created by Rossby waves with approximately zonal crests. Energy spectra of the flows in the wavenumber space indicate that a wavenumber similar to that introduced by Rhines for turbulent flows on the beta-plane can be introduced here. The wavenumber is based on the translational speed of a vortex rat...

Zhang, Yang

2015-01-01T23:59:59.000Z

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.


481

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

482

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

483

Water Waves Roger Grimshaw  

E-Print Network [OSTI]

,2) provide a kinematic description of water waves, which to this point means that the conditionsWater Waves Roger Grimshaw May 7, 2003 Abstract A short review of the theory of weakly nonlinear water waves, prepared for the forthcoming Encyclopedia of Nonlinear Science 1 Introduction Water waves

484

MEASUREMENT OF COMPRESSIONAL-WAVE SEISMIC VELOCITIES IN 29 WELLS AT THE HANFORD SITE  

SciTech Connect (OSTI)

Check shot seismic velocity surveys were collected in 100 B/C, 200 East, 200-PO-1 Operational Unit (OU), and the Gable Gap areas in order to provide time-depth correlation information to aid the interpretation of existing seismic reflection data acquired at the Hanford Site (Figure 1). This report details results from 5 wells surveyed in fiscal year (FY) 2008, 7 wells in FY 2009, and 17 wells in FY 2010 and provides summary compressional-wave seismic velocity information to help guide future seismic survey design as well as improve current interpretations of the seismic data (SSC 1979/1980; SGW-39675; SGW-43746). Augmenting the check shot database are four surveys acquired in 2007 in support of the Bechtel National, Inc. Waste Treatment Plant construction design (PNNL-16559, PNNL-16652), and check shot surveys in three wells to support seismic testing in the 200 West Area (Waddell et al., 1999). Additional sonic logging was conducted during the late 1970s and early 1980s as part of the Basalt Waste Isolation Program (BWIP) (SSC 1979/1980) and check shot/sonic surveys as part of the safety report for the Skagit/Hanford Nuclear project (RDH/10-AMCP-0164). Check shot surveys are used to obtain an in situ measure of compressional-wave seismic velocity for sediment and rock in the vicinity of the well point, and provide the seismic-wave travel time to geologic horizons of interest. The check shot method deploys a downhole seismic receiver (geophone) to record the arrival of seismic waves generated by a source at the ground surface. The travel time of the first arriving seismic-wave is determined and used to create a time-depth function to correlate encountered geologic intervals with the seismic data. This critical tie with the underlying geology improves the interpretation of seismic reflection profile information. Fieldwork for this investigation was conducted by in house staff during the weeks of September 22, 2008 for 5 wells in the 200 East Area (Figure 2); June 1, 2009 for 7 wells in the 200-PO-1 OU and Gable Gap regions (see Figure 3 and Figure 4); and March 22, 2010 and April 19, 2010 for 17 wells in the 200 East, The initial scope of survey work was planned for Wells 299-EI8-1, 699-2-E14, 699-12-18, 699-16-51, 699-42-30, 699-53-55B, 699-54-18D, and 699-84-34B. Well 299-E18-1 could not be entered due to bent casing (prevented removal of the pump), wells 699-12-18 and 699-42-30 could not be safely reached by the logging truck, Well 699-16-51 was decommissioned prior to survey start, Well 699-53-55B did not have its pump pulled, and Wells 699-2-EI4, 699-54-18D, and 699-84-34B are artesian and capped with an igloo structure. Table 1 provides a list of wells that were surveyed and Figure 1 through Figure 5 show the well locations relative to the Hanford Site.

PETERSON SW

2010-10-08T23:59:59.000Z

485

PROPAGATING WAVES ALONG SPICULES  

SciTech Connect (OSTI)

Alfvenic waves are thought to play an important role in coronal heating and acceleration of solar wind. Here we investigate the statistical properties of Alfvenic waves along spicules (jets that protrude into the corona) in a polar coronal hole using high-cadence observations of the Solar Optical Telescope on board Hinode. We developed a technique for the automated detection of spicules and high-frequency waves. We detected 89 spicules and found (1) a mix of upward propagating, downward propagating, as well as standing waves (occurrence rates of 59%, 21%, and 20%, respectively); (2) the phase speed gradually increases with height; (3) upward waves dominant at lower altitudes, standing waves at higher altitudes; (4) standing waves dominant in the early and late phases of each spicule, while upward waves were dominant in the middle phase; (5) in some spicules, we find waves propagating upward (from the bottom) and downward (from the top) to form a standing wave in the middle of the spicule; and (6) the medians of the amplitude, period, and velocity amplitude were 55 km, 45 s, and 7.4 km s{sup -1}, respectively. We speculate that upward propagating waves are produced near the solar surface (below the spicule) and downward propagating waves are caused by reflection of (initially) upward propagating waves off the transition region at the spicule top. The mix of upward and downward propagating waves implies that exploiting these waves to perform seismology of the spicular environment requires careful analysis and may be problematic.

Okamoto, Takenori J. [National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); De Pontieu, Bart, E-mail: joten.okamoto@nao.ac.jp [Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover Street, Palo Alto, CA 94304 (United States)

2011-08-01T23:59:59.000Z

486

Inspection of the Secretary of Energy`s foreign travel  

SciTech Connect (OSTI)

On December 9, 1995, the Secretary of Energy requested that the Department`s Inspector General (IG) conduct a thorough examination of all Secretarial foreign travel from 1993 to December 1995 to include the purpose of each trip, the activities of each Federal participant in each trip, the funding of each trip, and claims for reimbursements for expenses by Federal trip participants. The Secretary also requested that the review include an assessment of travel authorization, voucher, traveler reimbursement, and auditing systems employed by the Department to identify steps that could be taken to reduce errors and improve accounting oversight. Additionally, the Secretary requested that the Inspector General conduct a thorough examination of the establishment and filling of the Department`s Ombudsman position. The Office of Inspector General (OIG) initiated a review into these matters and assigned primary responsibility for the review to the Office of Inspections. The purpose of this inspection was to conduct a thorough examination of the 16 Secretarial foreign trips from June 1993 to December 1995. This report focuses on the four trade missions because of their extent and cost. We examined a number of Departmental management systems and processes involved in planning and executing the 16 foreign trips. To determine the actual cost of the 16 trips, it was necessary to determine who participated in the trips and to identify the individual travel costs. We were required to perform extensive reviews of records and conduct a large number of interviews because the Department could not provide any specific documents that could accurately account for who actually participated on the 16 trips. Having identified who participated, it was then necessary to examine key aspects of the Department`s management systems. Our report contains 31 recommendations for corrective action.

NONE

1996-10-07T23:59:59.000Z

487

The Archeology of Relic Sound Waves J.R. Gladden  

E-Print Network [OSTI]

The Archeology of Relic Sound Waves J.R. Gladden Assistant Professor of Physics University and results from this large body of work. I have found the recent article "Cosmic sound waves rule" by Daniel" in the movies aside). However, there was a time when sound waves filled the entire universe, and recent

Gladden, Josh

488

Wave turbulent statistics in non-weak wave turbulence  

E-Print Network [OSTI]

In wave turbulence, it has been believed that statistical properties are well described by the weak turbulence theory, in which nonlinear interactions among wavenumbers are assumed to be small. In the weak turbulence theory, separation of linear and nonlinear time scales derived from the weak nonlinearity is also assumed. However, the separation of the time scales is often violated even in weak turbulent systems where the nonlinear interactions are actually weak. To get rid of this inconsistency, closed equations are derived without assuming the separation of the time scales in accordance with Direct-Interaction Approximation (DIA), which has been successfully applied to Navier--Stokes turbulence. The kinetic equation of the weak turbulence theory is recovered from the DIA equations if the weak nonlinearity is assumed as an additional assumption. It suggests that the DIA equations is a natural extension of the conventional kinetic equation to not-necessarily-weak wave turbulence.

Naoto Yokoyama

2011-05-08T23:59:59.000Z

489

Cost Analysis of Plug-In Hybred Electric Vehicles Using GPS-Based Longitudinal Travel Data  

SciTech Connect (OSTI)

Using spatial, longitudinal travel data of 415 vehicles over 3 18 months in the Seattle metropolitan area, this paper estimates the operating costs of plug-in hybrid electric vehicles (PHEVs) of various electric ranges (10, 20, 30, and 40 miles) for 3, 5, and 10 years of payback period, considering different charging infrastructure deployment levels and gasoline prices. Some key findings were made. (1) PHEVs could help save around 60% or 40% in energy costs, compared with conventional gasoline vehicles (CGVs) or hybrid electric vehicles (HEVs), respectively. However, for motorists whose daily vehicle miles traveled (DVMT) is significant, HEVs may be even a better choice than PHEV40s, particularly in areas that lack a public charging infrastructure. (2) The incremental battery cost of large-battery PHEVs is difficult to justify based on the incremental savings of PHEVs operating costs unless a subsidy is offered for largebattery PHEVs. (3) When the price of gasoline increases from $4/gallon to $5/gallon, the number of drivers who benefit from a larger battery increases significantly. (4) Although quick chargers can reduce charging time, they contribute little to energy cost savings for PHEVs, as opposed to Level-II chargers.

Wu, Xing [Lamar University] [Lamar University; Dong, Jing [Iowa State University] [Iowa State University; Lin, Zhenhong [ORNL] [ORNL

2014-01-01T23:59:59.000Z

490

Self-biased planar millimeter wave notch filters based on magnetostatic wave excitation in barium hexagonal ferrite thin films  

E-Print Network [OSTI]

Self-biased planar millimeter wave notch filters based on magnetostatic wave excitation in bariumM thin films for self-biased planar millimeter wave notch filters was demonstrated for the first time because of the increased device size and weight as well as incompatibility with mono- lithic integrated

491

Propagating spectroscopy of backward volume spin waves in a metallic FeNi film  

SciTech Connect (OSTI)

We report a propagating spin wave spectroscopy for a magnetostatic backward volume spin wave in a metallic Fe{sub 19}Ni{sub 81} film. We show that the mutual-inductance between two independent antennas detects a small but clear propagation signal of backward volume spin waves. All experimental data are consistent with the time-domain propagating spin-wave spectroscopy. The control of propagating backward spin wave enables to realize the miniaturize spin-wave circuit.

Sato, N.; Ishida, N.; Kawakami, T. [Department of Physics, Keio University, Hiyoshi 3-14-1, Yokohama 223-8522 (Japan); Sekiguchi, K., E-mail: koji-s@phys.keio.ac.jp [Department of Physics, Keio University, Hiyoshi 3-14-1, Yokohama 223-8522 (Japan); JST-PRESTO, Gobancho 7, Chiyoda-ku, Tokyo 102-0076 (Japan)

2014-01-20T23:59:59.000Z

492

Photon wave function  

E-Print Network [OSTI]

Photon wave function is a controversial concept. Controversies stem from the fact that photon wave functions can not have all the properties of the Schroedinger wave functions of nonrelativistic wave mechanics. Insistence on those properties that, owing to peculiarities of photon dynamics, cannot be rendered, led some physicists to the extreme opinion that the photon wave function does not exist. I reject such a fundamentalist point of view in favor of a more pragmatic approach. In my view, the photon wave function exists as long as it can be precisely defined and made useful.

Iwo Bialynicki-Birula

2005-08-26T23:59:59.000Z

493

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]

University Statement on Carbon Offsetting for Travel July 2011 Travel contributes significantly be considered in the first instance. If flying is necessary, it is recommended that carbon offsets are purchased through one of the following: Government Quality Assurance Scheme for Carbon Offsetting (discontinued

Haase, Markus

494

TRAVELING WITH A LAPTOP COMPUTER OR ELECTRONIC DEVICES Faculty, staff, and students often travel with a laptop computer, PDA, flash drive or other electronic devices. It  

E-Print Network [OSTI]

TRAVELING WITH A LAPTOP COMPUTER OR ELECTRONIC DEVICES Faculty, staff, and students often travel with a laptop computer, PDA, flash drive or other electronic devices. It is important to note, that these electronic devices, their underlying software, and the technical data stored in them may be subject

Farritor, Shane

495

Lay Member of Council Mrs Jill Burgess Mrs Burgess started her career in 1972 entering the Travel and Tourism Industry  

E-Print Network [OSTI]

and Tourism Industry gaining professional entry into the Institute of Travel and Tourism. In 1991 she

Harman, Neal.A.

496

Rogue Wave Modes for the Long Wave-Short Wave Resonance Kwok Wing CHOW*(1)  

E-Print Network [OSTI]

1 Rogue Wave Modes for the Long Wave-Short Wave Resonance Model Kwok Wing CHOW*(1) , Hiu Ning CHAN.45.Yv; 47.35.Fg ABSTRACT The long wave-short wave resonance model arises physically when the phase velocity of a long wave matches the group velocity of a short wave. It is a system of nonlinear evolution

497

Steady periodic gravity waves with surface tension  

E-Print Network [OSTI]

In this paper we consider two-dimensional, stratified, steady water waves propagating over an impermeable flat bed and with a free surface. The motion is assumed to be driven by capillarity (that is, surface tension) on the surface and a gravitational force acting on the body of the fluid. We prove the existence of global continua of classical solutions that are periodic and traveling. This is accomplished by first constructing a 1-parameter family of laminar flow solutions, $\\mathcal{T}$, then applying bifurcation theory methods to obtain local curves of small amplitude solutions branching from $\\mathcal{T}$ at an eigenvalue of the linearized problem. Each solution curve is then continued globally by means of a degree theoretic theorem in the spirit of Rabinowitz. Finally, we complement the degree theoretic picture by proving an alternate global bifurcation theorem via the analytic continuation method of Dancer.

Samuel Walsh

2009-11-06T23:59:59.000Z

498

Shock wave absorber having apertured plate  

DOE Patents [OSTI]

The shock or energy absorber disclosed herein utilizes an apertured plate maintained under the normal level of liquid flowing in a piping system and disposed between the normal liquid flow path and a cavity pressurized with a compressible gas. The degree of openness (or porosity) of the plate is between 0.01 and 0.60. The energy level of a shock wave travelling down the piping system thus is dissipated by some of the liquid being jetted through the apertured plate toward the cavity. The cavity is large compared to the quantity of liquid jetted through the apertured plate, so there is little change in its volume. The porosity of the apertured plate influences the percentage of energy absorbed.

Shin, Yong W. (Western Springs, IL); Wiedermann, Arne H. (Chicago Heights, IL); Ockert, Carl E. (Vienna, VA)

1985-01-01T23:59:59.000Z

499

Shock wave absorber having apertured plate  

DOE Patents [OSTI]

The shock or energy absorber disclosed herein utilizes an apertured plate maintained under the normal level of liquid flowing in a piping system and disposed between the normal liquid flow path and a cavity pressurized with a compressible gas. The degree of openness (or porosity) of the plate is between 0.01 and 0.60. The energy level of a shock wave travelling down the piping system thus is dissipated by some of the liquid being jetted through the apertured plate toward the cavity. The cavity is large compared to the quantity of liquid jetted through the apertured plate, so there is little change in its volume. The porosity of the apertured plate influences the percentage of energy absorbed.

Shin, Y.W.; Wiedermann, A.H.; Ockert, C.E.

1983-08-26T23:59:59.000Z

500

INTERFERENCE FRINGES OF SOLAR ACOUSTIC WAVES AROUND SUNSPOTS  

SciTech Connect (OSTI)

Solar acoustic waves are scattered by a sunspot due to the interaction between the acoustic waves and the sunspot. The sunspot, excited by the incident wave, generates the scattered wave. The scattered wave is added to the incident wave to form the total wave around the sunspot. The interference fringes between the scattered wave and the incident wave are visible in the intensity of the total wave because the coherent time of the incident wave is of the order of a wave period. The strength of the interference fringes anti-correlates with the width of temporal spectra of the incident wave. The separation between neighboring fringes increases with the incident wavelength and the sunspot size. The strength of the fringes increases with the radial order n of the incident wave from n = 0 to n = 2, and then decreases from n = 2 to n = 5. The interference fringes play a role analogous to holograms in optics. This study suggests the feasibility of using the interference fringes to reconstruct the scattered wavefields of the sunspot, although the quality of the reconstructed wavefields is sensitive to the noise and errors in the interference fringes.

Chou, Dean-Yi; Zhao Hui; Yang, Ming-Hsu; Liang, Zhi-Chao, E-mail: chou@phys.nthu.edu.tw [Physics Department, National Tsing Hua University, Hsinchu, Taiwan (China)

2012-10-20T23:59:59.000Z