Recent Advances in Wave Travel Time Based Methodology for Structural Health Monitoring
Southern California, University of
identify wave velocity profiles of vertically propagating shear and torsional waves through the building monitoring, seismic interferometry, wave travel time 1. INTRODUCTION The ability to monitor the health
Time domain analysis of a gyrotron traveling wave amplifier with misaligned electron beam
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
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.
Southern California, University of
1 Earthquake Damage Detection in the Imperial County Services Building III: Analysis of Wave Travel characteristics of the structure, and are not sensitive to local damage. Wave travel times between selected changes in such characteristics of response are potentially more sensitive to local damage. In this paper
Hietala, Vincent M. (Placitas, NM); Vawter, Gregory A. (Albuquerque, NM)
1993-01-01T23:59:59.000Z
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.
1993-12-14T23:59:59.000Z
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.
Beam loading compensation of traveling wave linacs through the time dependence of the rf drive
Towne N.; Rose J.
2011-09-30T23:59:59.000Z
Beam loading in traveling-wave linear accelerating structures leads to unacceptable spread of particle energies across an extended train of bunched particles due to beam-induced field and dispersion. Methods for modulating the rf power driving linacs are effective at reducing energy spread, but for general linacs do not have a clear analytic foundation. We report here methods for calculating how to modulate the rf drive in arbitrarily nonuniform traveling-wave linacs within the convective-transport (power-diffusion) model that results in no additional energy spread due to beam loading (but not dispersion). Varying group velocity, loss factor, and cell quality factor within a structure, and nonzero particle velocity, are handled.
Sequentially pulsed traveling wave accelerator
Caporaso, George J. (Livermore, CA); Nelson, Scott D. (Patterson, CA); Poole, Brian R. (Tracy, CA)
2009-08-18T23:59:59.000Z
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.
Topological horseshoes in travelling waves of discretized nonlinear wave equations
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
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.
Empirical Measurements of Travelers' Value of Travel Time Reliability
Danda, Santosh Rao
2014-08-12T23:59:59.000Z
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...
Empirical Measurements of Travelers' Value of Travel Time Reliability
Danda, Santosh Rao
2014-08-12T23:59:59.000Z
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 ...
Gravitational Radiation from Travelling Waves on D-Strings
Julie D. Blum
2003-08-21T23:59:59.000Z
Boundary states that preserve supersymmetry are constructed for fractional D-strings with travelling waves on a ${\\bf C}^3/ {{\\bf Z}_2\\times {\\bf Z}_2}$ orbifold. The gravitational radiation emitted between two D-strings with antiparallel travelling waves is calculated.
Developing Improved Travel Time Reliability Measures For Real-time
Bertini, Robert L.
reliability Use for prioritizing improvements Outline #12; 95th Percentile Travel Time Travel Time Index: mean travel time divided by free flow travel time Buffer Index: difference between 95th percentile travel time and mean travel time, divided by mean travel time Planning Time Index: 95th percentile
the wave model A traveling wave is an organized disturbance
Winokur, Michael
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
SOLITARY-WAVE AND MULTI-PULSED TRAVELING-WAVE ...
1910-00-81T23:59:59.000Z
ential equations which model waves in a horizontal water channel traveling in ... undisturbed water depth and ? lies in [0,1]. ..... We content ourselves with.
Time Travel and the Reality of Spontaneity
C. K. Raju
2008-04-05T23:59:59.000Z
Contrary to the informed consensus, time travel implies spontaneity (as distinct from chance) so that time travel can only be of the second kind.
A novel wideband gyrotron travelling wave amplifier
Sirigiri, Jagadishwar R. (Jagadishwar Rao), 1973-
2003-01-01T23:59:59.000Z
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 ...
Traveling water waves with point vortices
Kristoffer Varholm
2015-03-20T23:59:59.000Z
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.
Noisy traveling waves: effect of selection on genealogies
E. Brunet; B. Derrida; A. H. Mueller; S. Munier
2006-10-04T23:59:59.000Z
For a family of models of evolving population under selection, which can be described by noisy traveling wave equations, the coalescence times along the genealogical tree scale like $\\log^\\alpha N$, where $N$ is the size of the population, in contrast with neutral models for which they scale like $N$. An argument relating this time scale to the diffusion constant of the noisy traveling wave leads to a prediction for $\\alpha$ which agrees with our simulations. An exactly soluble case gives trees with statistics identical to those predicted for mean-field spin glasses in Parisi's theory.
Treating Time Travel Quantum Mechanically
John-Mark A. Allen
2014-10-10T23:59:59.000Z
The fact that closed timelike curves (CTCs) are permitted by general relativity raises the question as to how quantum systems behave when time travel to the past occurs. Research into answering this question by utilising the quantum circuit formalism has given rise to two theories: Deutschian-CTCs (D-CTCs) and "postselected" CTCs (P-CTCs). In this paper the quantum circuit approach is thoroughly reviewed, and the strengths and shortcomings of D-CTCs and P-CTCs are presented in view of their non-linearity and time travel paradoxes. In particular, the "equivalent circuit model"---which aims to make equivalent predictions to D-CTCs, while avoiding some of the difficulties of the original theory---is shown to contain errors. The discussion of D-CTCs and P-CTCs is used to motivate an analysis of the features one might require of a theory of quantum time travel, following which two overlapping classes of new theories are identified. One such theory, the theory of "transition probability" CTCs (T-CTCs), is fully developed. The theory of T-CTCs is shown not to have certain undesirable features---such as time travel paradoxes, the ability to distinguish non-orthogonal states with certainty, and the ability to clone or delete arbitrary pure states---that are present with D-CTCs and P-CTCs. The problems with non-linear extensions to quantum mechanics are discussed in relation to the interpretation of these theories, and the physical motivations of all three theories are discussed and compared.
Stable operating regime for traveling wave devices
Carlsten, Bruce E. (Los Alamos, NM)
2000-01-01T23:59:59.000Z
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.
Traveling-wave photodetectors with high power-bandwidth and gain-bandwidth product performance
2004-01-01T23:59:59.000Z
TRAVELING-WAVE PHOTODETECTORS WITH HIGH POWER–BANDWIDTH ANDTraveling-wave photodetectors for high-power, largeTRAVELING-WAVE PHOTODETECTORS WITH HIGH POWER–BANDWIDTH AND
Observational evidence for travelling wave modes bearing distance proportional shifts
Guruprasad, V
2015-01-01T23:59:59.000Z
Discrepancies of range between the Space Surveillance Network radars and the Deep Space Network in tracking the 1998 earth flyby of NEAR, and between ESA's Doppler and range data in Rosetta's 2009 flyby, reveal a consistent excess delay, or lag, equal to instantaneous one-way travel time in the telemetry signals. These lags readily explain all details of the flyby anomaly, and are shown to be symptoms of chirp d'Alembertian travelling wave solutions, relating to traditional sinusoidal waves by a rotation of the spectral decomposition due to the clock acceleration caused by the Doppler rates during the flybys. The lags thus relate to special relativity, but yield distance proportional shifts like those of cosmology at short range.
Observational evidence for travelling wave modes bearing distance proportional shifts
V. Guruprasad
2015-07-18T23:59:59.000Z
Discrepancies of range between the Space Surveillance Network radars and the Deep Space Network in tracking the 1998 earth flyby of NEAR, and between ESA's Doppler and range data in Rosetta's 2009 flyby, reveal a consistent excess delay, or lag, equal to instantaneous one-way travel time in the telemetry signals. These lags readily explain all details of the flyby anomaly, and are shown to be symptoms of chirp d'Alembertian travelling wave solutions, relating to traditional sinusoidal waves by a rotation of the spectral decomposition due to the clock acceleration caused by the Doppler rates during the flybys. The lags thus relate to special relativity, but yield distance proportional shifts like those of cosmology at short range.
Development of a thermoacoustic travelling-wave refrigerator
Paris-Sud XI, Université de
Development of a thermoacoustic travelling-wave refrigerator M. Pierensa , J.-P. Thermeaua , T. Le, a thermoacoustic travelling-wave refrigerator has been developed. Its performances are presented in this paper the refrigerator, its instrumentation and its experimental test bench. Finally we give the results obtained from
Bifurcations of traveling wave solutions for an integrable equation
Li Jibin [Department of Mathematics, Zhejiang Normal University, Jinhua, Zhejiang 321004 (China) and Kunming University of Science and Technology, Kunming, Yunnan 650093 (China); Qiao Zhijun [Department of Mathematics, University of Texas Pan-American, 1201 West University Drive, Edinburg, Texas 78541 (United States)
2010-04-15T23:59:59.000Z
This paper deals with the following equation m{sub t}=(1/2)(1/m{sup k}){sub xxx}-(1/2)(1/m{sup k}){sub x}, which is proposed by Z. J. Qiao [J. Math. Phys. 48, 082701 (2007)] and Qiao and Liu [Chaos, Solitons Fractals 41, 587 (2009)]. By adopting the phase analysis method of planar dynamical systems and the theory of the singular traveling wave systems to the traveling wave solutions of the equation, it is shown that for different k, the equation may have infinitely many solitary wave solutions, periodic wave solutions, kink/antikink wave solutions, cusped solitary wave solutions, and breaking loop solutions. We discuss in a detail the cases of k=-2,-(1/2),(1/2),2, and parametric representations of all possible bounded traveling wave solutions are given in the different (c,g)-parameter regions.
DEVELOPING IMPROVED TRAVEL TIME RELIABILITY MEASURES FOR REAL-TIME AND ARCHIVED ITS DATA
Bertini, Robert L.
including travel time, 95th percentile travel time, travel time index, buffer index planning time index-based detector data, collected in periodic special studies, or estimated using simulation [1,3]: 95th Percentile between 95th percentile travel time and mean travel time, divided by mean travel time. Planning Time Index
Travelling times in scattering by obstacles
Lyle Noakes; Luchezar Stoyanov
2014-09-29T23:59:59.000Z
The paper deals with some problems related to recovering information about an obstacle in an Euclidean space from certain measurements of lengths of generalized geodesics in the exterior of the obstacle. The main result is that if two obstacles satisfy some generic regularity conditions and have (almost) the same traveling times, then the generalized geodesic flows in their exteriors are conjugate on the non-trapping part of their phase spaces with a time preserving conjugacy. In the case of a union of two strictly convex domains in the plane, a constructive algorithm is described to recover the obstacle from traveling times.
Traveling wave device for combining or splitting symmetric and asymmetric waves
Möbius, Arnold (Eggenstein, DE); Ives, Robert Lawrence (Saratoga, CA)
2005-07-19T23:59:59.000Z
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.
Chen, Cynthia Q; Mokhtarian, Patricia L
2006-01-01T23:59:59.000Z
Time Allocations to Maintenance Activities/Travel andShare of Time Spent on Maintenance Activities/Travel (w m )Elasticity of Time Spent on Maintenance Activities, as a
Dendritic Actin Filament Nucleation Causes Traveling Waves and Patches
Anders E. Carlsson
2010-05-28T23:59:59.000Z
The polymerization of actin via branching at a cell membrane containing nucleation-promoting factors is simulated using a stochastic-growth methodology. The polymerized-actin distribution displays three types of behavior: a) traveling waves, b) moving patches, and c) random fluctuations. Increasing actin concentration causes a transition from patches to waves. The waves and patches move by a treadmilling mechanism which does not require myosin II. The effects of downregulation of key proteins on actin wave behavior are evaluated.
Continuum Cascade Model: Branching Random Walk for Traveling Wave
Yoshiaki Itoh
2015-07-15T23:59:59.000Z
The food web is a directed graph in which nodes label species and directed links represent the predation between species. Cascade models generate random food webs. The recursion to obtain the probability distribution of the longest chain length has the solution with traveling wave. We consider a branching random walk to study the asymptotic probability on the wave front.
Traveling-wave device with mass flux suppression
Swift, Gregory W. (Santa Fe, NM); Backhaus, Scott N. (Los Alamos, NM); Gardner, David L. (White Rock, NM)
2000-01-01T23:59:59.000Z
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.
Traveling water waves with critical layers
Ailo Aasen; Kristoffer Varholm
2015-08-19T23:59:59.000Z
We establish the existence of small-amplitude uni- and bimodal steady periodic gravity waves with an affine vorticity distribution. The solutions describe waves with critical layers and an arbitrary number of crests and troughs in each minimal period. Our bifurcation argument differs slightly from earlier theory, and under certain conditions we prove that the waves found are different from the ones in previous investigations. An important part of the analysis is a fairly complete description of the small-amplitude solutions. Finally, we investigate the asymptotic behavior of solutions on the local bifurcation set.
Transformation of spatial and perturbation derivatives of travel time
Cerveny, Vlastislav
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
Infiltration in Porous Media with Dynamic Capillary Pressure: Travelling Waves
Hulshof, Joost
Infiltration in Porous Media with Dynamic Capillary Pressure: Travelling Waves C. Cuesta # , C to gravity, results in a pseudoÂparabolic Burgers type equation. We give a rigorous study of global of study in this paper. We confine ourselves to the particular case of unsaturated groundwater flow, where
A Geometric Construction of Traveling Waves in a Bioremediation Model
Beck, Margaret
A Geometric Construction of Traveling Waves in a Bioremediation Model Margaret Beck , Arjen Bioremediation is a promising technique for cleaning contaminated soil. We study an idealized bioremediation In situ bioremediation is a promising technique for cleaning contaminated soil (see [9] and the references
A Geometric Construction of Traveling Waves in a Bioremediation Model
Beck, Margaret
A Geometric Construction of Traveling Waves in a Bioremediation Model M. Beck , A. Doelman , T. J email: mabeck@math.bu.edu Abstract Bioremediation is a promising technique for cleaning contam- inated groundwater and soil. We study a bioremediation model involving a substrate (contaminant to be removed
Apparatus and method for measuring and imaging traveling waves
Telschow, Kenneth L. (Idaho Falls, ID); Deason, Vance A. (Idaho Falls, ID)
2001-01-01T23:59:59.000Z
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.
Shielded serpentine traveling wave tube deflection structure
Hudson, C.L.; Spector, J.
1994-12-27T23:59:59.000Z
A shielded serpentine slow wave deflection structure is disclosed having a serpentine signal conductor within a channel groove. The channel groove is formed by a serpentine channel in a trough plate and a ground plane. The serpentine signal conductor is supported at its ends by coaxial feed through connectors. A beam interaction trough intersects the channel groove to form a plurality of beam interaction regions wherein an electron beam may be deflected relative to the serpentine signal conductor. 4 figures.
TRAVELING WAVES IN A FINITE CONDENSATION RATE MODEL FOR STEAM INJECTION
Eindhoven, Technische Universiteit
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
Shielded serpentine traveling wave tube deflection structure
Hudson, Charles L. (Santa Barbara, CA); Spector, Jerome (Berkeley, CA)
1994-01-01T23:59:59.000Z
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).
Rigorous Analysis of Traveling Wave Photodetectors under High-Power Illumination
Aste, Andreas
Rigorous Analysis of Traveling Wave Photodetectors under High- Power Illumination Damir Pasalic data has shown excellent agreement. I. INTRODUCTION High-power traveling-wave photodetectors (TWPDs and velocity mismatch between the optical and RF waves over the length of the TWPD. For high power handling
Fast Traveling-Wave Reactor of the Channel Type
Vitaliy D. Rusov; Victor A. Tarasov; Volodymyr N. Vashchenko; Sergei A. Chernezhenko; Andrei A. Kakaev; Oksana I. Pantak
2015-04-06T23:59:59.000Z
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.
Fast Traveling-Wave Reactor of the Channel Type
Rusov, Vitaliy D; Vashchenko, Volodymyr N; Chernezhenko, Sergei A; Kakaev, Andrei A; Pantak, Oksana I
2015-01-01T23:59:59.000Z
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.
Viscosity and porosity contribute to both speed and decay of tectorial membrane traveling waves
Sellon, Jonathan Blake
2013-01-01T23:59:59.000Z
The tectorial membrane (TM) is thought to play a critical role in stimulating cochlear hair cells. Recently, it has been shown that the tectorial membrane supports traveling waves [14] and that these waves may contribute ...
Travel Time Reliability: Its Measurement and Prediction | ornl...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Travel Time Reliability: Its Measurement and Prediction Apr 02 2014 10:00 AM - 11:00 AM George List, North Carolina State University, Raleigh, and Richard Margiotta, Cambridge...
Three-cell traveling wave superconducting test structure
Avrakhov, Pavel; Kanareykin, Alexei; /Euclid Techlabs, Solon; Kazakov, Sergey; Solyak, Nikolay; Wu, Genfa; Yakovlev, Vyacheslav P.; /Fermilab
2011-03-01T23:59:59.000Z
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.
Propagation in a kinetic reaction-transport equation: travelling waves and accelerating fronts
Calvez, Vincent
describes particles moving according to a velocity-jump process, and proliferating thanks to a reaction termPropagation in a kinetic reaction-transport equation: travelling waves and accelerating fronts the existence and stability of travelling wave solutions of a kinetic reaction- transport equation. The model
RESEARCH PAPER Simulation-based analysis of flow due to traveling-plane-wave
Yanikoglu, Berrin
RESEARCH PAPER Simulation-based analysis of flow due to traveling-plane-wave deformations: 28 March 2007 Ó Springer-Verlag 2007 Abstract One of the propulsion mechanisms of micro- organisms be placed in a channel and actuated for pumping of the fluid by means of introducing a series of traveling-wave
Linear relaxation to planar Travelling Waves in Inertial Confinement Fusion
Monsaingeon, Léonard
2012-01-01T23:59:59.000Z
We study linear stability of planar travelling waves for a scalar reaction-diffusion equation with non-linear anisotropic diffusion. The mathematical model is derived from the full thermo-hydrodynamical model describing the process of Inertial Confinement Fusion. We show that solutions of the Cauchy problem with physically relevant initial data become planar exponentially fast with rate $s(\\eps',k)>0$, where $\\eps'=\\frac{T_{min}}{T_{max}}\\ll 1$ is a small temperature ratio and $k\\gg 1$ the transversal wrinkling wavenumber of perturbations. We rigorously recover in some particular limit $(\\eps',k)\\rightarrow (0,+\\infty)$ a dispersion relation $s(\\eps',k)\\sim \\gamma_0 k^{\\alpha}$ previously computed heuristically and numerically in some physical models of Inertial Confinement Fusion.
Vanajakshi, Lelitha Devi
2005-11-01T23:59:59.000Z
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 ...
PARTICLE ENERGY SPECTRA AT TRAVELING INTERPLANETARY SHOCK WAVES
Reames, Donald V., E-mail: dvreames@umd.edu [Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742 (United States)
2012-09-20T23:59:59.000Z
We have searched for evidence of significant shock acceleration of He ions of {approx}1-10 MeV amu{sup -1} in situ at 258 interplanetary traveling shock waves observed by the Wind spacecraft. We find that the probability of observing significant acceleration, and the particle intensity observed, depends strongly upon the shock speed and less strongly upon the shock compression ratio. For most of the 39 fast shocks with significant acceleration, the observed spectral index agrees with either that calculated from the shock compression ratio or with the spectral index of the upstream background, when the latter spectrum is harder, as expected from diffusive shock theory. In many events the spectra are observed to roll downward at higher energies, as expected from Ellison-Ramaty and from Lee shock-acceleration theories. The dearth of acceleration at {approx}85% of the shocks is explained by (1) a low shock speed, (2) a low shock compression ratio, and (3) a low value of the shock-normal angle with the magnetic field, which may cause the energy spectra that roll downward at energies below our observational threshold. Quasi-parallel shock waves are rarely able to produce measurable acceleration at 1 AU. The dependence of intensity on shock speed, seen here at local shocks, mirrors the dependence found previously for the peak intensities in large solar energetic-particle events upon speeds of the associated coronal mass ejections which drive the shocks.
Wunderlich, Kaufman, and Smith LINK TRAVEL TIME PREDICTION FOR
Smith, Robert L.
. In the Decentralized Dynamic architecture, link-travel times are broadcast to vehicles to provide real-time estimates Architecture does project a gradual progression over time from Autonomous to Decentralized to Centralized route route guidance develops as a viable service. Centralized architectures are projected
Stability of Travelling Waves for a Damped Hyperbolic Th. Gallay and G. Raugel
Stability of Travelling Waves for a Damped Hyperbolic Equation Th. Gallay and G. Raugel CNRS et [Ka], Bricmont and Kupiainen [BK], Gallay [Ga], Eckmann and Wayne [EW], using functional
A penalization method for calculating the flow beneath travelling water waves of large amplitude
Adrian Constantin; Konstantinos Kalimeris; Otmar Scherzer
2014-08-08T23:59:59.000Z
A penalization method for a suitable reformulation of the governing equations as a constrained optimization problem provides accurate numerical simulations for large-amplitude travelling water waves in irrotational flows and in flows with constant vorticity.
Interpolation of raytheory travel times within ray cells
Cerveny, Vlastislav
Interpolation of rayÂtheory travel times within ray cells Petr Bulant & LudÅ¸ek KlimeÅ¸s Department techniques. Several methods based on deÂ composition of the model volume into ray cells, and on further interpolation within individual ray cells, were introduced. In the wavefront tracing method (Vinje et al. 1996a
Interpolation of raytheory travel times within ray cells
Cerveny, Vlastislav
Interpolation of rayÂtheory travel times within ray cells Petr Bulant & LudÅ¸ek KlimeÅ¸s Department title: Interpolation within ray cells Summary 3ÂD ray tracing followed by interpolation of the computed on the decomposition of the model volume into ray cells, and on further interpolation within the individual ray cells
Time travel, Clock Puzzles and Their Experimental Tests
Ignazio Ciufolini
2013-06-07T23:59:59.000Z
Is time travel possible? What is Einstein's theory of relativity mathematically predicting in that regard? Is time travel related to the so-called clock 'paradoxes' of relativity and if so how? Is there any accurate experimental evidence of the phenomena regarding the different flow of time predicted by General Relativity and is there any possible application of the temporal phenomena predicted by relativity to our everyday life? Which temporal phenomena are predicted in the vicinities of a rotating body and of a mass-energy current, and do we have any experimental test of the occurrence of these phenomena near a rotating body? In this paper, we address and answer some of these questions.
Traveling waves in yeast extract and in cultures of Dictyostelium discoideum
Steinbock, Oliver
Zhabo- tinsky (BZ) reaction (cf. Ref. [9]). The velocity v of the excitation waves depends in general reaction step according to the relation v (k D)1/2 . Deviations from the constant velocity of a single traveling reaction-diffusion waves occur in response to oscillatory reactions. Glycolytic degradation
Nonlinear dynamics of optical pulses in fibres with a travelling refractive-index-change wave
Adamova, M S; Zolotovskii, Igor' O; Sementsov, Dmitrii I [Ul'yanovsk State University, Ul'yanovsk (Russian Federation)
2009-03-31T23:59:59.000Z
Dynamics of soliton-like wave packets in fibres with a travelling refractive-index-change wave is studied. It is shown that both a soliton-like propagation regime of a pulse and a self-compression regime in the region of normal group velocity dispersion are possible. It is also shown that in the case of a copropagating or counterpropagating pulse and optically inhomogeneous wave nonreciprocal effects appear. (solitons)
York, Robert A.
to that of an optimum load for each device, thus realizing a traveling-wave power amplifier. The results for a 19-GHz. Additionally, power is lost to backward wave excitation on the artificial output line. A goal of this research port, thus real- izing a traveling wave power amplifier (TWPA). A 19-GHz coplanar waveguide (CPW
Travel{time calculation in heterogeneous 3-D structures * Lud ek Klime s
Cerveny, Vlastislav
Travel{time calculation in heterogeneous 3-D structures * Lud#20;ek Klime#20;s Department-mail: psencik@earn.cvut.cz Summary The selection of the numerical method to calculate travel times depends on the nature of the travel times, on the complexity and computer representation of the seismic model
Using Empirical Data to Find the Best Measurement for Travel Time Reliability
Alemazkoor, Negin
2014-08-20T23:59:59.000Z
benefit from reliable travel times. Thus, the value of reliability (VOR) is beginning to factor into cost/benefit analyses of transportation projects and understanding travelers’ mode and route choices. VOR has almost always been estimated through stated...
Validating Dynamic Message Sign Freeway Travel Time Messages Using Ground Truth Geospatial Data
Bertini, Robert L.
Validating Dynamic Message Sign Freeway Travel Time Messages Using Ground Truth Geospatial Data agencies have invested more than $300 million in dynamic message sign (DMS) systems for communicating important messages to travelers, including weather conditions, incidents, construction, homeland security
Studies of the superconducting traveling wave cavity for high gradient LINAC
Avrakhov, Pavel; Kanareykin, Alexei; Solyak, Nikolay; Yakovlev, Vyacheslav P
2015-01-01T23:59:59.000Z
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.
Dual Use of Traveling and Standing Lamb Waves for Structural Health Monitoring
Giurgiutiu, Victor
Dual Use of Traveling and Standing Lamb Waves for Structural Health Monitoring Victor Giurgiutiu@sc.edu ABSTRACT Structural health monitoring (SHM) is an emerging technology with great potential in structural to structures. The paper presents results on the dual use of PWAS for structural health monitoring through: (a
Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier
Temkin, Richard J.
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 ...
Behavioral/Systems/Cognitive Traveling Waves on the Organ of Corti of the Chinchilla
Allen, Jont
Behavioral/Systems/Cognitive Traveling Waves on the Organ of Corti of the Chinchilla Cochlea populations of ANF responses to tones and to tone complexes recorded in many chinchillas. Since depolarization anesthetized male chinchillas, using conventional methods fully described previously (Temchin et al., 2008
Comparison of actinide production in traveling wave and pressurized water reactors
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
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)
Real-time Water Waves with Wave Particles
Yuksel, Cem
2010-10-12T23:59:59.000Z
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 ...
Davidson, Ronald C
2015-01-01T23:59:59.000Z
This paper makes use of a one-dimensional kinetic model to investigate the nonlinear longitudinal dynamics of a long coasting beam propagating through a perfectly conducting circular pipe with radius $r_{w}$. The average axial electric field is expressed as $\\langle E_{z}\\rangle=-(\\partial/\\partial z)\\langle\\phi\\rangle=-e_{b}g_{0}\\partial\\lambda_{b}/\\partial z-e_{b}g_{2}r_{w}^{2}\\partial^{3}\\lambda_{b}/\\partial z^{3}$, where $g_{0}$ and $g_{2}$ are constant geometric factors, $\\lambda_{b}(z,t)=\\int dp_{z}F_{b}(z,p_{z},t)$ is the line density of beam particles, and $F_{b}(z,p_{z},t)$ satisfies the 1D Vlasov equation. Detailed nonlinear properties of traveling-wave and traveling-pulse (solitons) solutions with time-stationary waveform are examined for a wide range of system parameters extending from moderate-amplitudes to large-amplitude modulations of the beam charge density. Two classes of solutions for the beam distribution function are considered, corresponding to: (a) the nonlinear waterbag distribution, w...
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Davidson, Ronald C.; Qin, Hong
2015-09-21T23:59:59.000Z
This paper makes use of a one-dimensional kinetic model to investigate the nonlinear longitudinal dynamics of a long coasting beam propagating through a perfectly conducting circular pipe with radius r w . The average axial electric field is expressed as z >=–(?/?z)=–ebg???b/?z – ebg2r2w?3?b/?z3, where g0 and g2 are constant geometric factors, ?b(z,t)=?dpz Fb (z,pz,t) is the line density of beam particles, and F b (z,pz,t) satisfies the 1D Vlasov equation. Detailed nonlinear properties of traveling-wave and traveling-pulse (soliton) solutions with time-stationary waveform are examined for a wide range of system parameters extending from moderate-amplitudes to large-amplitude modulations ofmore »the beam charge density. Two classes of solutions for the beam distribution function are considered, corresponding to: (i) the nonlinear waterbag distribution, where Fb = const in a bounded region of pz-space; and (ii) nonlinear Bernstein-Green-Kruskal (BGK)-like solutions, allowing for both trapped and untrapped particle distributions to interact with the self-generated electric field.« less
Fundamentals of Traveling Wave Ion Mobility Spectrometry. | EMSL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
slower at higher c. A nonlinear dependence of the transit time on mobility means that the true resolving power of TW IMS differs from the apparent value, often substantially. In...
Steinbock, Oliver
Scroll Wave Filaments Terminate in the Back of Traveling Fronts Tama´s Ba´nsa´gi, Jr., Christine with the 1,4-cyclohexanedione Belousov-Zhabotinsky reaction demonstrate that three-dimensional scroll waves and the wave-termination of filaments are direct consequences of the system's anomalous dispersion relation
Asymptotics of QCD traveling waves with fluctuations and running coupling effects
Guillaume Beuf
2008-08-27T23:59:59.000Z
Extending independently the Balitsky-Kovchegov (BK) equation to running coupling or to fluctuation effects due to Pomeron loops is known to lead in both cases to qualitative changes of the traveling-wave asymptotic solutions. In this paper we study the extension of the forward BK equation, including both running coupling and fluctuations effects, using the method developed for the fixed coupling case. We derive the exact asymptotic behavior of the probabilistic distribution of the saturation scale.
High-power and wavelength-tunable traveling-wave semiconductor ring laser
Peng, En Titus
1991-01-01T23:59:59.000Z
purely electromagnetic effect, in contrast to traditional mechanically based instruments typified by the spinning-wheel gyroscope. Recent work on semiconductor ring lasers and erbium fiber ring lasers are largely directed towards achieving narrow..., "Narrow spectral linewidth semiconductor optical-fiber ring laser, " Appl. Phys. Lett?voL 49, pp. 1328-1330, 1986. [4] P, R, Morkel, G. J. Cowle, and D. N. Payne, "Travelling-wave erbium fibre ring laser with 60 kHz linewidth, " Electron. Lett. , vol...
Computer representation of the model covariance function resulting from travel-time tomography
Cerveny, Vlastislav
Computer representation of the model covariance function resulting from travel-time tomography Lud a supplement to the paper by Klime#20;s (2002b) on the stochastic travel{time tomography. It contains brief covariance function is a function of 6 coordinates with pro- nounced singularities. The computer
Boyer, Edmond
Euro Working Group on Transportation 2014 Estimating Travel Time Distribution under different of the distribution of travel time is needed to properly estimate these values. Congestion distorts the distribution and particular statistical distributions are needed. Different distributions have been proposed in the literature
Simulation studies on the standing and traveling wave thermoacoustic prime movers
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
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.
Ferrier, Pete James
1999-01-01T23:59:59.000Z
signs. Both corridor and link travel times were studied, as well as possible factors that might affect travel times such as path, time of day, length of link, and average number of lanes per link. These travel times were analyzed using simple...
Traveling waves in Hall-magnetohydrodynamics and the ion-acoustic shock structure
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
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.
Integrating a Traveling Wave Tube into an AECR-U ion source
Covo, Michel Kireeff; Benitez, Janilee Y.; Ratti, Alessandro; Vujic, Jasmina L.
2011-07-01T23:59:59.000Z
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.
A Maximum Likelihood Method with Penalty to Estimate Link Travel Time Based on Trip Itinerary Data
Zhong, Chujun
2014-12-15T23:59:59.000Z
Travel time is an important network performance measure. It is a challenging subject due to the fluctuations in traffic characteristics, such as traffic flow. This study proposes a maximum likelihood method with penalty ...
Zeng, Xiaosi
2011-02-22T23:59:59.000Z
The artificial neural network (ANN) approach has been recognized as a capable technique to model the highly complex and nonlinear problem of travel time prediction. In addition to the nonlinearity, a traffic system is also temporally and spatially...
Linear and Nonlinear Modeling of a Traveling-Wave Thermoacoustic Heat Engine
Scalo, Carlo; Hesselink, Lambertus
2014-01-01T23:59:59.000Z
We have carried out three-dimensional Navier-Stokes simulations, from quiescent conditions to the limit cycle, of a traveling-wave thermoacoustic heat engine (TAE) composed of a long variable-area resonator shrouding a smaller annular tube, which encloses the hot (HHX) and ambient (AHX) heat-exchangers, and the regenerator (REG). Simulations are wall-resolved, with no-slip and adiabatic conditions enforced at all boundaries, while the heat transfer and drag due to the REG and HXs are modeled. HHX temperatures have been investigated in the range 440K - 500K with AHX temperature fixed at 300K. The initial exponential growth of acoustic energy is due to a network of traveling waves amplified by looping around the REG/HX unit in the direction of the imposed temperature gradient. A simple analytical model demonstrates that such thermoacoustic instability is a Lagrangian thermodynamic process resembling a Stirling cycle. A system-wide linear stability model based on Rott's theory is able to accurately predict the f...
Shtaygrud, Ilaan
2014-12-16T23:59:59.000Z
and the INF Method . . . . . . . . . . . . . . . . . . 11 3. MONITORING GEOMETRY AND THE FEASIBILITY OF THE INF METHOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.1 Receiver Array Characteristics and dt(l) Resolution.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 Relative travel time function dt(l) as a function of receiver position l 12 2.5 Derivative of the relative travel time function dt(l) as a function of receiver position l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1 Model...
Shtaygrud, Ilaan
2014-12-16T23:59:59.000Z
and the INF Method . . . . . . . . . . . . . . . . . . 11 3. MONITORING GEOMETRY AND THE FEASIBILITY OF THE INF METHOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.1 Receiver Array Characteristics and dt(l) Resolution.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 Relative travel time function dt(l) as a function of receiver position l 12 2.5 Derivative of the relative travel time function dt(l) as a function of receiver position l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1 Model...
A methodology for predicting minimum travel paths using real-time traffic network data
Liu, Chang
1991-01-01T23:59:59.000Z
, existing traffic simulation and optimization models have been reviewed, and appropriate models have been chosen to predict link travel time and fuel consumption. Link-node types of mathematical networks have been established, and minimum travel distance... Integration of ATMS with ADIS Traffic Data Fusion For Link Time Prediction . . NETWORK ANALYSIS Shortest Path Problem Shortest Path with Fixed-Charges Problem . . STUDY DESIGN REVIEW OF EXISTING TRAFFIC MODELS PASSER II-87 PASSER III-88 TRANSYT-7F...
Time symmetry in wave function collapse models
Daniel Bedingham
2015-02-25T23:59:59.000Z
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.
HELIOSEISMIC SIGNATURE OF CHROMOSPHERIC DOWNFLOWS IN ACOUSTIC TRAVEL-TIME MEASUREMENTS FROM HINODE
Nagashima, Kaori; Sekii, Takashi [Department of Astronomical Science, The Graduate University for Advanced Studies (Sokendai), National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Kosovichev, Alexander G.; Zhao Junwei [W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305 (United States); Tarbell, Theodore D. [Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover Street, Palo Alto, CA 94304 (United States)], E-mail: kaorin@solar.mtk.nao.ac.jp
2009-04-01T23:59:59.000Z
We report on a signature of chromospheric downflows in two emerging flux regions detected by time-distance helioseismology analysis. We use both chromospheric intensity oscillation data in the Ca II H line and photospheric Dopplergrams in the Fe I 557.6 nm line obtained by Hinode/SOT for our analyses. By cross-correlating the Ca II oscillation signals, we have detected a travel-time anomaly in the plage regions; outward travel times are shorter than inward travel times by 0.5-1 minute. However, such an anomaly is absent in the Fe I data. These results can be interpreted as evidence of downflows in the lower chromosphere. The downflow speed is estimated to be below 10 km s{sup -1}. This result demonstrates a new possibility of studying chromospheric flows by time-distance analysis.
Travelling waves in a mixture of gases with bimolecular reversible reactions
A. Rossani; A. M. Scarfone
2003-12-01T23:59:59.000Z
Starting from the kinetic approach for a mixture of reacting gases whose particles interact through elastic scattering and a bimolecular reversible chemical reaction, the equations that govern the dynamics of the system are obtained by means of the relevant Boltzmann-like equation. Conservation laws are considered. Fluid dynamic approximations are used at the Euler level to obtain a close set of PDEs for six unknown macroscopic fields. The dispersion relation of the mixture of reacting gases is explicitly derived in the homogeneous equilibrium state. A set of ODE that governs the propagation of a plane travelling wave is obtained using the Galilei invariance. After numerical integration some solutions, including the well-known Maxwellian and the hard spheres cases, are found for various meaningful interaction laws. The main macroscopic observables for the gas mixture such as the drift velocity, temperature, total density, pressure and its chemical composition are shown.
B. V. Gisin
2015-08-20T23:59:59.000Z
The field of a traveling circularly polarized electromagnetic wave and a constant magnetic field localizes fermions perpendicularly to propagation of the wave in the cross section of the order of the wavelength. Unusual exact solutions of the Dirac equation correspond to this localization. Except to routine use of thin fermion beams it can be suitable for alternative measurements of the g - factor. Details and peculiarities of the solutions in application to the measurements are considered in the paper.
Strangeway, Robert J.
FAST Spacecraft Reveals Fundamental Plasma Wave Emission Mechanism NASA's Fast Auroral Snapshot (FAST) Small Explorer has traveled to the source region of the Earth's most powerful radio emission Auroral Kilometric Radiation (AKR). FAST's high resolution particles and fields measurements have revealed
Pugh, Mary
ultrasonic motor V. Bolborici a, , F.P. Dawson b , M.C. Pugh c a University of Texas at El Paso, Department Keywords: Piezoelectric Ultrasonic Motor Stator Eigenfrequency a b s t r a c t Piezoelectric traveling wave rotary ultrasonic motors are motors that generate torque by using the fric- tion force between
Travel Guide Travel Mode Options
Crowther, Paul
reduce your travel costs, alleviate congestion and parking problems, reduce your carbon footprint.uclan.ac.uk/sustainabletravel For travel advice contact: UCLan Sports Arena 01772 761000 Reduce time, money and your carbon footprint
Semantics of time travel in a generative information space
Khandelwal, Madhur Jugalkishore
2005-02-17T23:59:59.000Z
This thesis focuses on interactive and computational semantics for manipulating the time-based medium of an evolving information space. The interactive semantics enable the user to engage in linear timeline traversal and non-linear history...
Understanding bus travel time variation using AVL data
Gerstle, David G
2012-01-01T23:59:59.000Z
The benefits of bus automatic vehicle location (AVL) data are well documented (see e.g., Furth et al. (2006)), ranging from passenger-facing applications that predict bus arrival times to service-provider-facing applications ...
Meju, Max
Joint two-dimensional DC resistivity and seismic travel time inversion with cross to evaluate the structural features common to both methods. The cross-gradients function is incorporated method. The resultant iterative two-dimensional (2-D) joint inversion scheme is successfully applied
ForPeerReview Viability of Travel-time Sensitivity Testing for Estimating
Ward, Karen
of Tomographic Velocity Models: A Case Study Journal: Geophysics Manuscript ID: GEO-2008-0386 Manuscript Type Inversion, Seismic Velocity/Statics GEOPHYSICS #12;ForPeerReview Averill et al., Travel Time Sensitivity Models: A Case Study Matthew G. Averill* , Kate C. Miller (corresponding author), Vladik Krenovich
Estimating Reaction Rate Coefficients Within a Travel-Time Modeling Framework
Gong, R [Georgia Institute of Technology; Lu, C [Georgia Institute of Technology; Luo, Jian [Georgia Institute of Technology; Wu, Wei-min [Stanford University; Cheng, H. [Stanford University; Criddle, Craig [Stanford University; Kitanidis, Peter K. [Stanford University; Gu, Baohua [ORNL; Watson, David B [ORNL; Jardine, Philip M [ORNL; Brooks, Scott C [ORNL
2011-03-01T23:59:59.000Z
A generalized, efficient, and practical approach based on the travel-time modeling framework is developed to estimate in situ reaction rate coefficients for groundwater remediation in heterogeneous aquifers. The required information for this approach can be obtained by conducting tracer tests with injection of a mixture of conservative and reactive tracers and measurements of both breakthrough curves (BTCs). The conservative BTC is used to infer the travel-time distribution from the injection point to the observation point. For advection-dominant reactive transport with well-mixed reactive species and a constant travel-time distribution, the reactive BTC is obtained by integrating the solutions to advective-reactive transport over the entire travel-time distribution, and then is used in optimization to determine the in situ reaction rate coefficients. By directly working on the conservative and reactive BTCs, this approach avoids costly aquifer characterization and improves the estimation for transport in heterogeneous aquifers which may not be sufficiently described by traditional mechanistic transport models with constant transport parameters. Simplified schemes are proposed for reactive transport with zero-, first-, nth-order, and Michaelis-Menten reactions. The proposed approach is validated by a reactive transport case in a two-dimensional synthetic heterogeneous aquifer and a field-scale bioremediation experiment conducted at Oak Ridge, Tennessee. The field application indicates that ethanol degradation for U(VI)-bioremediation is better approximated by zero-order reaction kinetics than first-order reaction kinetics.
Glenn, Timothy Scott, 1971-
2002-01-01T23:59:59.000Z
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 ...
Nazarenko, Sergey
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
Benmessai, Karim; Tobar, Michael Edmund; Bazin, Nicholas; Bourgeois, Pierre-Yves; Kersale, Yann; Giordano, Vincent [School of Physics M013, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009 (Australia); Institut FEMTO-ST, UMR 6174 CNRS, Universite de Franche-Comte, 25044 Besancon (France)
2009-05-01T23:59:59.000Z
We report observations of the gyrotropic change in magnetic susceptibility of the Fe{sup 3+} electron paramagnetic resonance at 12.037 GHz (between spin states |1/2> and |3/2>) in sapphire with respect to the applied magnetic field. Measurements were made by observing the response of the high-Q whispering gallery doublet in a Hemex sapphire resonator cooled to 5 K. The doublets initially existed as standing waves at zero field and were transformed to traveling waves due to the gyrotropic response.
Ferrier, Pete James
1999-01-01T23:59:59.000Z
The floating car method of travel time data collection has been used since the 1920's to evaluate transportation issues such as congestion management and freeway operation. However, this technique can be time consuming, labor intensive...
A methodology for predicting minimum travel paths using real-time traffic network data
Liu, Chang
1991-01-01T23:59:59.000Z
A METHODOLOGY FOR PREDICTING MINIMUM TRAVEL PATHS USING REAL-TIME TRAFFIC NETWORK DATA A Thesis by Chang Liu Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillrnent of the requirements for the degree... operations. ACKNOWLEDGEMENTS I would like to express special thanks to Dr. Daniel B. Fambro for his guidance, assistance, and patience from the initial stage of my graduate career at Texas A&M University through the final stage of the research documented...
Breu, Ruth
superseded by conference versionCite as: Christoph Sommer, Robert Krul, Reinhard German and Falko vs. Travel Time: Simulative Evaluation of the Environmental Impact of ITS Christoph Sommer, Robert und Kommunikationssysteme Christoph Sommer, Robert Krul, Reinhard German and Falko Dressler
Varaiya, Pravin
propose using the standard deviation and the 90th percentile travel time, in addition to the mean percentile measures the extremes. Traditional measures of LOS also indicate the service quality. In fact, LOS
Jacobson, A.R.; Carlos, R.C.; Massey, R.S.; Wui, Guanghui [Los Alamos National Lab., NM (United States)] [Los Alamos National Lab., NM (United States)
1995-02-01T23:59:59.000Z
The authors have operated a very long baseline interferometer array at a northern midlatitude site, illuminated by VHF radio beacons from two geosynchronous satellites, quasi-continuously for over a year. The array can detect and measure the trace velocity of traveling ionosphere disturbances (TIDs) via their signatures in the line-of-sight total electron content (TEC). The system noise level is of the order of 10{sup 13} m{sup {minus}2} in the TEC, so that even very weak perturbations can be studied. They have used the year-long TID detection/velocimetry data set to describe local time and seasonal dependences of the wave parameters. The most striking finding is that the preferred azimuths of TIDs in the data set tend to belong to either of two modes: The first mode, strongest at midday and in the early afternoon, particularly around winter equinox, propagates southward. The second mode, strongest in the evening, especially during summer solstice through autumn equinox, propagates west-northwestward. The two modes are disposed in local time such as to suggest the agency of clockwise rotation of the TID preferred azimuths versus time, as expected by wind filtering in the thermospheric diurnal tide. However, there is a gap between the two modes` azimuth bands. Moreover, the two modes exist in all trace-speed quartiles of the data set TIDs, a finding which is at variance with the hypothesis of wind filtering being the primary explanation of these modes. 28 refs., 13 figs.
STABILITY OF TRAVELING WAVES FOR DEGENERATE SYSTEMS OF REACTION DIFFUSION EQUATIONS
Latushkin, Yuri
-diffusion system at a traveling pulse or front, we prove a theorem that allows one to derive information about in neurons; certain combustion models [9]; population models in which some species diffuse and others do Classification. 47D06, 35K57, 35B40. Key words and phrases. front, pulse, spectrally stable, linearly stable, C0
One-way, real time wave front converters
Kwong, S.; Yariv, A.
1986-03-03T23:59:59.000Z
Optical one-way, real time wave front cleanup by means of photorefractively pumped oscillators is reported. A factor of 4000 increase in beam brightness has been achieved.
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
Light Properties Light travels at the speed of light `c'
Mojzsis, Stephen J.
LIGHT!! #12;Light Properties Light travels at the speed of light `c' C = 3 x 108 m/s Or 190,000 miles/second!! Light could travel around the world about 8 times in one second #12;What is light?? Light is a "wave packet" A photon is a "light particle" #12;Electromagnetic Radiation and You Light is sometimes
On the recovery of traveling water waves with vorticity from the pressure at the bed
Vera Mikyoung Hur; Michael R. Livesay
2015-10-08T23:59:59.000Z
We propose higher-order approximation formulae recovering the surface elevation from the pressure at the bed and the background shear flow for small-amplitude Stokes and solitary water waves. They offer improvements over the pressure transfer function and the hydrostatic approximation. The formulae compare reasonably well with asymptotic approximations of the exact relation between the pressure at the bed and the surface wave in the zero vorticity case, but they incorporate the effects of vorticity through solutions of the Rayleigh equation. Several examples are discussed.
Johnson, Mathew A.; Zumbrun, Kevin
2010-10-21T23:59:59.000Z
waves in plasmas [TRR]. When the assumption that the wave is purely one- dimensional is relaxed to allow for weak dependence in a transverse direction, one is led to a variety of multidimensional generalizations of the KdV equation. One of the most well... studied weakly two-dimensional variations of the KdV equation is the Kadomtsev–Petviashvili (KP) equation [KP] given by (1.2) (ut ? uxxx ? uux)x + ?uyy = 0, where the constant ? = ±1 differentiates between equations with positive (? = +1) and negative (?...
Latushkin, Yuri
, such as Hodgkin-Huxley and FitzHugh-Nagumo; combustion and chemical reaction equations in which some reactant communication, combustion theory, biomathematics (calcium waves in tissue, nerve conduction, population dynamics suppose that Y() is an equilibrium solution of (1.2) with lim ± Y() = Y±. Y() is called a pulse if Y- = Y
Global stability of travelling fronts for a damped wave equation with bistable nonlinearity
Joly, Romain
GALLAY & Romain JOLY Institut Fourier, UMR CNRS 5582 UniversitÂ´e de Grenoble I B.P. 74 38402 Saint-Martin-d'H`eres, France Thierry.Gallay@ujf-grenoble.fr Romain.Joly@ujf-grenoble.fr Abstract: We consider the damped wave.1) was first proved by Hadeler [19, 20], and a few stability results were subsequently obtained by Gallay
Eustice, Ryan
Preliminary Deep Water Results in Single-Beacon One-Way-Travel-Time Acoustic Navigation results from the first deep-water evaluation of this method using data collected from an autonomous of Mechanical Engineering Johns Hopkins University, Baltimore, MD 21218 email: {swebster,llw}@jhu.edu Department
Multi-time wave functions for quantum field theory
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
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.
Ryan, James Patrick
1992-01-01T23:59:59.000Z
AN ALGORITHM FOR THE SOLUTION OF A TRAVELING SALESMAN PROBLEM TO MINIMIZE THE AVERAGE TIME TO DEMAND SATISFACTION A Thesis by JAMES PATRICK RYAN Submitted to the Office of Graduate Studies of Texas ASM University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 1992 Major Subject: Industrial Engineering AN ALGORITHM FOR THB SOLUTION OF A TRAVBLING SALESMAN PROBLEM TO MINIMIBB THE AVBRAGE TIME TO DEMAND SATISFACTION A Thesis by JAMES PATRICK RYAN...
Contributions to the direct time integration in wave propagation analyses
Noh, Gunwoo
2013-01-01T23:59:59.000Z
This thesis intends to contribute to the computational methods for wave propagations. We review an implicit time integration method, the Bathe method, that remains stable without the use of adjustable parameters when the ...
Ecological collapse and the emergence of traveling waves at the onset of shear turbulence
Shih, Hong-Yan; Goldenfeld, Nigel
2015-01-01T23:59:59.000Z
The transition to turbulence exhibits remarkable spatio-temporal behavior that continues to defy detailed understanding. Near the onset to turbulence in pipes, transient turbulent regions decay either directly or, at higher Reynolds numbers through splitting, with characteristic time-scales that exhibit a super-exponential dependence on Reynolds number. Here we report numerical simulations of transitional pipe flow, showing that a zonal flow emerges at large scales, activated by anisotropic turbulent fluctuations; in turn, the zonal flow suppresses the small-scale turbulence leading to stochastic predator-prey dynamics. We show that this "ecological" model of transitional turbulence reproduces the super-exponential lifetime statistics and phenomenology of pipe flow experiments. Our work demonstrates that a fluid on the edge of turbulence is mathematically analogous to an ecosystem on the edge of extinction, and provides an unbroken link between the equations of fluid dynamics and the directed percolation univ...
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
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.
Ryan, James Patrick
1992-01-01T23:59:59.000Z
to check as a minimum each subset of tours defined by every arc (n-I subsets) which originates at the source (first) node. Problem Definition The problem can now be defined as follows: Given a network G = (N, A), where N is a set of nodes representing... cities and A is the set of arcs (i, j) representing the travel time between cities i and j. Also given D = (d. ), where d. represents the unsatisfied demand at city j and R = (r ), where r- is the rate at which demand is serviced at any city. Find...
Cooling by Time Reversal of Atomic Matter Waves
Martin, J.; Georgeot, B.; Shepelyansky, D. L. [Laboratoire de Physique Theorique, Universite de Toulouse III, CNRS, 31062 Toulouse (France)
2008-02-01T23:59:59.000Z
We propose an experimental scheme which allows us to realized approximate time reversal of matter waves for ultracold atoms in the regime of quantum chaos. We show that a significant fraction of the atoms return back to their original state, being at the same time cooled down by several orders of magnitude. We give a theoretical description of this effect supported by extensive numerical simulations. The proposed scheme can be implemented with existing experimental setups.
Loschmidt cooling by time reversal of atomic matter waves
J. Martin; B. Georgeot; D. L. Shepelyansky
2007-11-28T23:59:59.000Z
We propose an experimental scheme which allows to realize approximate time reversal of matter waves for ultracold atoms in the regime of quantum chaos. We show that a significant fraction of the atoms return back to their original state, being at the same time cooled down by several orders of magnitude. We give a theoretical description of this effect supported by extensive numerical simulations. The proposed scheme can be implemented with existing experimental setups.
Robertson, William
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
Quantified Traveler: Travel Feedback Meets the Cloud to Change Behavior
2013-01-01T23:59:59.000Z
spent traveling (time, cost, CO2, and calories) was able toemissions (kg of CO2), calories burned, cost ($), and traveland cost (Q4) spent traveling did not shift awareness, the information on calories (Q3) and CO2 (
The wave equation on static singular space-times
Eberhard Mayerhofer
2008-02-12T23:59:59.000Z
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
Time-Reversal Invariance and the Relation between Wave Chaos and Classical Chaos
Snieder, Roel
Time-Reversal Invariance and the Relation between Wave Chaos and Classical Chaos Roel Snieder for imaging are invariant for time reversal. The physical reason for this is that in imaging one propagates the recorded waves backward in time to the place and time when the waves interacted with the medium
Freely floating structures trapping time-harmonic water waves (revisited)
Nikolay Kuznetsov; Oleg Motygin
2014-10-22T23:59:59.000Z
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.
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), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA Journey Inside the Presentations Patents FrontiersRecyclingRelocation Travel Relocation Travel Travel
Time asymptotics of the Schroedinger wave function in time-periodic potentials
O. Costin; R. D. Costin; J. L. Lebowitz
2006-08-13T23:59:59.000Z
We study the transition to the continuum of an initially bound quantum particle in $\\RR^d$, $d=1,2,3$, subjected, for $t\\ge 0$, to a time periodic forcing of arbitrary magnitude. The analysis is carried out for compactly supported potentials, satisfying certain auxiliary conditions. It provides complete analytic information on the time Laplace transform of the wave function. From this, comprehensive time asymptotic properties (Borel summable transseries) follow. We obtain in particular a criterion for whether the wave function gets fully delocalized (complete ionization). This criterion shows that complete ionization is generic and provides a convenient test for particular cases. When satisfied it implies absence of discrete spectrum and resonances of the associated Floquet operator. As an illustration we show that the parametric harmonic perturbation of a potential chosen to be any nonzero multiple of the characteristic function of a measurable compact set has this property.
SHEAR WAVE TIME-LAPSE SEISMIC MONITORING OF A TIGHT GAS SANDSTONE RESERVOIR, RULISON FIELD, COLORADO
SHEAR WAVE TIME-LAPSE SEISMIC MONITORING OF A TIGHT GAS SANDSTONE RESERVOIR, RULISON FIELD focused specifically on the use of time-lapse (4D) poststack migrated shear-wave seismic data of shear wave data as a tool for monitoring 4D changes. The basin centered tight gas sandstone reservoir
Bertini, Robert L.
that minimizes vehicle emissions during design of routes in congested environments with time emissions, and several laboratory and field methods are available for estimating vehicle emissions rates (1 is not linear. Congestion has a great impact on vehicle emissions and fuel efficiency. In real driving
The stability of Killing-Cauchy horizons in colliding plane wave space-times
J. B. Griffiths
2005-01-05T23:59:59.000Z
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.
Short-time-evolved wave functions for solving quantum many-body problems
Ciftja, O.; Chin, Siu A.
2003-01-01T23:59:59.000Z
converges essentially to the exact ground state in a relatively short time. Thus a short-time evolved wave function can be an excellent approximation to the exact ground state. Such a short-time-evolved wave function can be obtained by factorizing...
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
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.
Radio Science, Volume ???, Number , Pages 110, Time Reversal of Electromagnetic Waves and
Paris 7 - Denis Diderot, Université
electromagnetic pulse at a central frequency of 2.45 GHz in a high-Q cavity. Another antenna records the stronglyRadio Science, Volume ???, Number , Pages 110, Time Reversal of Electromagnetic Waves demonstration of time-reversal focusing with electromagnetic waves in a SISO scheme. An antenna transmits a 1 µs
Design of Millimeter-Wave Power Ampliers in Silicon /
Kalantari, Nader
2013-01-01T23:59:59.000Z
1.1 Millimeter-Wave Power Amplifier . . . . . . . . . .ported mm-wave power amplifiers. . . . . . . . . . . . . . .GHz Tapered Constructive Wave Power 3.1 Traveling Wave Power
Accurately specifying storm-time ULF wave radial diffusion in the radiation belts
Dimitrakoudis, Stavros; Balasis, Georgios; Papadimitriou, Constantinos; Anastasiadis, Anastasios; Daglis, Ioannis A
2015-01-01T23:59:59.000Z
Ultra-low frequency (ULF) waves can contribute to the transport, acceleration and loss of electrons in the radiation belts through inward and outward diffusion. However, the most appropriate parameters to use to specify the ULF wave diffusion rates are unknown. Empirical representations of diffusion coefficients often use Kp; however, specifications using ULF wave power offer an improved physics-based approach. We use 11 years of ground-based magnetometer array measurements to statistically parameterise the ULF wave power with Kp, solar wind speed, solar wind dynamic pressure and Dst. We find Kp is the best single parameter to specify the statistical ULF wave power driving radial diffusion. Significantly, remarkable high energy tails exist in the ULF wave power distributions when expressed as a function of Dst. Two parameter ULF wave power specifications using Dst as well as Kp provide a better statistical representation of storm-time radial diffusion than any single variable alone.
A space-time BIE method for wave equation exterior problems. The Neumann case.
Ceragioli, Francesca
A space-time BIE method for wave equation exterior problems. The Neumann case. S. Falletta , G. Monegato , L. ScuderiÂ§ Abstract In this paper we consider the (2D and 3D) exterior problem for the wave equation, with a Neumann boundary condition and in general with non trivial data. First we derive a space
Local energy decay and Strichartz estimates for the wave equation with time-periodic
Petkov, Vesselin
Local energy decay and Strichartz estimates for the wave equation with time-periodic perturbations(z) = (U(T, 0) - z)-1 , (x) C 0 (Rn ), where U(t, s) is the propagator related to the wave equation) and T > 0 is the period. Assuming that R(z) has no poles z with |z| 1, we establish a local energy decay
P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas
Sun, Youshun, 1970-
2005-01-01T23:59:59.000Z
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 ...
Pulsar Timing Noise and the Search for Very-Low-Frequency Gravitational Waves
Weinreb, Sander
Pulsar Timing Noise and the Search for Very-Low-Frequency Gravitational Waves John Armstrong, Frank in any other way · Scientific payoff Test of fundamental physical law GW astronomy: seeing the "Dark
FIBER-OPTIC PRESSURE SENSOR FOR TIME-OF-FLIGHT MEASUREMENTS IN A SHOCK WAVE
Texas at Arlington, University of
temperatures as encountered in combustors. To ensure high-temperature survivability, such sensors may be bonded the pressure pulse and the time-of-flight (TOF) of a propagating detonation wave for implementation shock tubes
Goulias, Konstadinos G
2007-01-01T23:59:59.000Z
on men's time allocation, it may function as a constraintindicating time allocation of men functions as a strongdaily time allocation and does not function as a constraint
Murayama, Hitoshi
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
Aperture synthesis of time-limited X waves and analysis of their propagation characteristics
Lu, Jian-yu
of Engineering Physics and Mathematics, Faculty of Engineering Cairo University, Giza, Egypt Ioannis M. Besieris. Also, the possibility of using a finite-time excitation of a dynamic aperture to generate a finite-energy-time aperture. This confirms the fact that time windowing the infinite energy X-wave excitation is a viable
Gravitational wave detection using pulsars: status of the Parkes Pulsar Timing Array project
G. B. Hobbs; M. Bailes; N. D. R. Bhat; S. Burke-Spolaor; D. J. Champion; W. Coles; A. Hotan; F. Jenet; L. Kedziora-Chudczer; J. Khoo; K. J. Lee; A. Lommen; R. N. Manchester; J. Reynolds; J. Sarkissian; W. van Straten; S. To; J. P. W. Verbiest; D. Yardley; X. P. You
2008-12-15T23:59:59.000Z
The first direct detection of gravitational waves may be made through observations of pulsars. The principal aim of pulsar timing array projects being carried out worldwide is to detect ultra-low frequency gravitational waves (f ~ 10^-9 to 10^-8 Hz). Such waves are expected to be caused by coalescing supermassive binary black holes in the cores of merged galaxies. It is also possible that a detectable signal could have been produced in the inflationary era or by cosmic strings. In this paper we review the current status of the Parkes Pulsar Timing Array project (the only such project in the Southern hemisphere) and compare the pulsar timing technique with other forms of gravitational-wave detection such as ground- and space-based interferometer systems.
Seismic wave propagation in thinly-layered media with steep reflectors
Deng, H.L.
1992-05-01T23:59:59.000Z
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.
Search for gravitational waves associated with the August 2006 timing glitch of the Vela pulsar
Abadie, J.; Abbott, B. P.; Abbott, R.; Adhikari, R.; Ajith, P.; Anderson, S. B.; Araya, M.; Aso, Y.; Ballmer, S.; Betzwieser, J.; Billingsley, G.; Black, E.; Blackburn, J. K.; Bork, R.; Brooks, A. F.; Cannon, K. C.; Cardenas, L.; Cepeda, C.; Chalermsongsak, T.; Chatterji, S. [LIGO - California Institute of Technology, Pasadena, California 91125 (United States)
2011-02-15T23:59:59.000Z
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 was observed in the radio emission of PSR B0833-45, the Vela pulsar. At the time of the glitch, the two colocated 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 6.3x10{sup -21} to 1.4x10{sup -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 5.0x10{sup 44} to 1.3x10{sup 45} erg.
Initial wave packets and the various power-law decreases of scattered wave packets at long times
Manabu Miyamoto
2004-04-09T23:59:59.000Z
The long time behavior of scattered wave packets $\\psi (x,t)$ from a finite-range potential is investigated, by assuming $\\psi (x,t)$ to be initially located outside the potential. It is then shown that $\\psi (x,t)$ can asymptotically decrease in the various power laws at long time, according to its initial characteristics at small momentum. As an application, we consider the square-barrier potential system and demonstrate that $\\psi (x,t)$ exhibits the asymptotic behavior $t^{-3/2}$, while another behavior like $t^{-5/2}$ can also appear for another $\\psi (x,t)$.
Real-time fracture monitoring in Engineered Geothermal Systems with seismic waves
Jose A. Rial; Jonathan Lees
2009-03-31T23:59:59.000Z
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.
Bazant, Martin Z.
AC Electro-osmotic Flow Synonyms Induced-charge electro-osmosis, AC pumping of liquids, traveling-charge electro-osmotic flow around electrodes applying an alternating voltage. Overview Classical electrokinetic phenomena, such as electro-osmotic flow and electrophoresis, are linear in the applied voltage and thus
Matter pulse carving: Manipulating quantum wave packets via time-dependent absorption
Goussev, Arseni
2015-01-01T23:59:59.000Z
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.
P-WAVE TIME-LAPSE SEISMIC DATA INTERPRETATION AT RULISON FIELD, PICEANCE BASIN, COLORADO
P-WAVE TIME-LAPSE SEISMIC DATA INTERPRETATION AT RULISON FIELD, PICEANCE BASIN, COLORADO by Donald-lapse seismic surveys, shot by the Reservoir Characterization Project in the fall of 2003 and 2004, at Rulison seismic can monitor tight gas reservoirs, to a limited extent, over a short period of time. Repeat surveys
Space-time BIE methods for non homogeneous exterior wave equation problems. The Dirichlet case.
Ceragioli, Francesca
Space-time BIE methods for non homogeneous exterior wave equation problems. The Dirichlet case. S. Falletta , G. Monegato , L. ScuderiÂ§ Abstract In this paper we consider the (2D and 3D) exterior problem; non homogeneous conditions; space-time boundary integral equations; numerical methods This work
Monitoring glacier surface seismicity in time and space using Rayleigh waves
Marshall, Hans-Peter
Monitoring glacier surface seismicity in time and space using Rayleigh waves T. D. Mikesell,1,2 K 2011; revised 24 February 2012; accepted 22 March 2012; published 10 May 2012. [1] Sliding glaciers located on Bench Glacier, Alaska (USA) (61.033 N, 145.687 W). We focus on the arrival-time and amplitude
Panter, Jenna; Costa, Silvia; Dalton, Alice; Jones, Andy; Ogilvie, David
2014-09-19T23:59:59.000Z
on an elastic belt on the waist during waking hours and participants were provided with a charger and asked to recharge the battery each night. Questionnaire and travel diary 6 In the questionnaire, participants reported all travel modes used... we use digital life-log images to investigate active and sedentary travel behaviour? Results from a pilot study. International Journal of Behavioral Nutrition and Physical Activity 2011, 8:44. 13. Allen A: Dredging up the past: Lifelogging, memory...
Kim, Hee-Kyung
2008-01-01T23:59:59.000Z
production function, the optimal allocation of time tofunction, the structural model of household resource allocationfunction. Domestic production model The optimal allocation
Xihao Deng
2014-10-23T23:59:59.000Z
Gravitational wave background results from the superposition of gravitational waves generated from all sources across the Universe. Previous efforts on detecting such a background with pulsar timing arrays assume it is an isotropic Gaussian background with a power law spectrum. However, when the number of sources is limited, the background might be non-Gaussian or the spectrum might not be a power law. Correspondingly previous analysis may not work effectively. Here we use a method --- Bayesian Nonparametric Analysis --- to try to detect a generic gravitational wave background, which directly sets constraints on the feasible shapes of the pulsar timing signals induced by a gravitational wave background and allows more flexible forms of the background. Our Bayesian nonparametric analysis will infer if a gravitational wave background is present in the data, and also estimate the parameters that characterize the background. This method will be much more effective than the conventional one assuming the background spectrum follows a power law in general cases. While the context of our discussion focuses on pulsar timing arrays, the analysis itself is directly applicable to detect and characterize any signals that arise from the superposition of a large number of astrophysical events.
Nano-Hertz Gravitational Waves Searches with Interferometric Pulsar Timing Experiments
Massimo Tinto
2011-01-20T23:59:59.000Z
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.
LaCure, Mari Mae
2010-04-29T23:59:59.000Z
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...
DYNAMIC RESERVOIR CHARACTERIZATION USING P-WAVE SEISMIC TIME-LAPSE AT POSTLE FIELD,
DYNAMIC RESERVOIR CHARACTERIZATION USING P-WAVE SEISMIC TIME-LAPSE AT POSTLE FIELD, TEXAS COUNTY characterize the reservoir at Postle Field. RCP shot a 6.25 square miles 4D, 9C seismic survey in March 2008.3 to 0.15. Quadrature attribute and seismic inversion-of-difference provide qualitative and quantitative
Time-lapse monitoring of rock properties with coda wave interferometry
Snieder, Roel
dam and volcano monitoring, time-lapse reservoir characterization, earthquake relocation, and stress, this typically means ignoring the coda waves that make up the tail of a seismogram. (In music the coda is the concluding passage of a movement or composition (Latin cauda, tail).) Geophysical applications based on use
Gräfener, G
2015-01-01T23:59:59.000Z
The progenitors of type-IIb supernovae (SNe) are believed to have lost their H-rich envelopes almost completely in the direct pre-SN phase. Recently the first 'flash spectrum' of a SN IIb (SN2013cu) has been presented, taken early enough to study its immediate circumstellar medium (CSM). Similar to a previous study by Groh (2014) we analyse the structure and chemical composition of the optically-thick CSM using non-LTE model atmospheres. For the first time we take light-travel time (LTT) effects on the spectrum formation into account, which affect the shapes and strengths of the observable emission lines, as well as the inferred SN luminosity. Based on the new CSM parameters we estimate a lower limit of ~0.3Msun for the CSM mass, which is a factor 10-100 higher than previous estimates. The spectral fit implies a CSM in the form of a homogeneous and spherically symmetric superwind whose mass-loss rate exceeds common expectations by up to two orders of magnitude. The derived chemical composition is in agreement...
Exploring the Manifold of Seismic Waves: Application to the Estimation of Arrival-Times
Kye M. Taylor; Michael J. Procopio; Christopher J. Young; Francois G. Meyer
2010-07-22T23:59:59.000Z
We propose a new method to analyze seismic time series and estimate the arrival-times of seismic waves. Our approach combines two ingredients: the times series are first lifted into a high-dimensional space using time-delay embedding; the resulting phase space is then parametrized using a nonlinear method based on the eigenvectors of the graph Laplacian. We validate our approach using a dataset of seismic events that occurred in Idaho, Montana, Wyoming, and Utah, between 2005 and 2006. Our approach outperforms methods based on singular-spectrum analysis, waveleta nalysis, and STA/LTA.
Exploring the Manifold of Seismic Waves: Application to the Estimation of Arrival-Times
Taylor, K M; Young, C J; Meyer, F G
2010-01-01T23:59:59.000Z
We propose a new method to analyze seismic time series and estimate the arrival-times of seismic waves. Our approach combines two ingredients: the times series are first lifted into a high-dimensional space using time-delay embedding; the resulting phase space is then parametrized using a nonlinear method based on the eigenvectors of the graph Laplacian. We validate our approach using a dataset of seismic events that occurred in Idaho, Montana, Wyoming, and Utah, between 2005 and 2006. Our approach outperforms methods based on singular-spectrum analysis, waveleta nalysis, and STA/LTA.
2001-01-01T23:59:59.000Z
Real-Time Laser-Based Non-Intrusive Detection System forof a laser-based non-intrusive detection system for real-Real-Time Laser-Based Non-Intrusive Detection System for
Cheng, Harry H.; Shaw, Ben; Palen, Joe; Wang, Zhaoqing; Chen, Bo
2002-01-01T23:59:59.000Z
Real-Time Laser-Based Non-Intrusive Detection System forJoe Palen, "A Laser-Based Non-Intrusive Detection System forReal-Time Laser-Based Non-Intrusive Detection System for
QGP time formation in holographic shock waves model of heavy ion collisions
Aref'eva, Irina Ya
2015-01-01T23:59:59.000Z
We estimate the thermalization time in two colliding shock waves holographic model of heavy-ion collisions. For this purpose we model the process by the Vaidya metric with a horizon defined by the trapped surface location. We consider two bottom-up AdS/QCD models that give, within the colliding shock waves approach, the dependence of multiplicity on the energy compatible with RHIC and LHC results. One model is a bottom-up AdS/QCD confining model and the other is related to an anisotropic thermalization. We estimate the thermalization time and show that increasing the confining potential decreases the thermalization time as well as an anisotropy accelerates the thermalization.
QGP time formation in holographic shock waves model of heavy ion collisions
Irina Ya. Aref'eva
2015-03-07T23:59:59.000Z
We estimate the thermalization time in two colliding shock waves holographic model of heavy-ion collisions. For this purpose we model the process by the Vaidya metric with a horizon defined by the trapped surface location. We consider two bottom-up AdS/QCD models that give, within the colliding shock waves approach, the dependence of multiplicity on the energy compatible with RHIC and LHC results. One model is a bottom-up AdS/QCD confining model and the other is related to an anisotropic thermalization. We estimate the thermalization time and show that increasing the confining potential decreases the thermalization time as well as an anisotropy accelerates the thermalization.
Chasing 5-sigma: Prospects for searches for long-duration gravitational-waves without time slides
Michael Coughlin; Patrick Meyers; Shivaraj Kandhasamy; Eric Thrane; Nelson Christensen
2015-05-01T23:59:59.000Z
The detection of unmodeled gravitational-wave bursts by ground-based interferometric gravitational-wave detectors is a major goal for the advanced detector era. These searches are commonly cast as pattern recognition problems, where the goal is to identify statistically significant clusters in spectrograms of strain power when the precise signal morphology is unknown. In previous work, we have introduced a clustering algorithm referred to as "seedless clustering," and shown that it is a powerful tool for detecting weak long-lived (10-1000s) signals in background. However, as the algorithm is currently conceived, in order to carry out an all-sky search on a $\\approx$ year of data, significant computational resources may be required in order to carry out background estimation. Alternatively, some of the sensitivity of the search must be sacrificed to control computational costs. The sensitivity of the algorithm is limited by the amount of computing resources due to the requirement of performing background studies to assign significance in gravitational-wave searches. In this paper, we present an analytic method for estimating the background generated by the seedless clustering algorithm and compare the performance to both Monte Carlo Gaussian noise and time-shifted gravitational-wave data from a week of LIGO's 5th Science Run. We demonstrate qualitative agreement between the model and measured distributions and argue that the approximation will be useful to supplement conventional background estimation techniques for advanced detector searches for long-duration gravitational-wave transients.
Hubbard, Susan
Field-scale estimation of volumetric water content using ground- penetrating radar ground wave] Ground-penetrating radar (GPR) ground wave techniques were applied to estimate soil water content travel time measurements using 900 and 450 MHz antennas and analyzed these data to estimate water content
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2002-09-04T23:59:59.000Z
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.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2006-02-17T23:59:59.000Z
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.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2006-02-17T23:59:59.000Z
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.
Tomlinson, Beverly
2013-02-22T23:59:59.000Z
THE RELATIONSHIP OF TRAVEL AGENTS AND CONSUMER TRAVEL MA GAZINES CONCERNING THE TRAVEL DES TINA TIONS OF TOURISTS USING TRAVEL AGENCIES A Senior Thesis By Beverly Tomlinson 1997-98 University Undergraduate Research Fellow Texas A&M University...
Connexxus Traveler Profile Arranger Assignment
Tsien, Roger Y.
Connexxus Traveler Profile Arranger Assignment Travelers have the option of submitting an email to UCTravel@ucop.edu authorizing UC Travel Management Services to access the traveler's profile and assign profile information. Specify permission options: Can Book Travel Can Access Traveler Profile Can Book
Wave VelocityWave Velocity Diff t f ti l l itDifferent from particle velocity
Yoo, S. J. Ben
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
Travel Reimbursement Request Form Submit to: Front Desk
Rose, Michael R.
Travel Reimbursement Request Form Submit to: Front Desk Department of Pharmaceutial Sciences 147 expenses) If travel time does not include overnight stay (between 7AM - 8PM), the traveler should not claim before 11 AM and arrival after 2 PM; dinner - departure before 5 PM. PM and arrival after 7 PM NOTE
Payne, Rupert Alistair
2009-07-07T23:59:59.000Z
Photoplethysmography (PPG) is a simple means of measuring the pulse wave in humans, exploitable for the purposes of timing the arrival of the pulse at a particular point in the arterial tree, and for pulse contour analysis. ...
Nagaraj, Mahavir
2004-11-15T23:59:59.000Z
of the relaxation time constants. This method has been adapted from Suh [15]. Consider a plane harmonic wave propagating with a phase velocity c in a direction defined by the propagation vector p represented by [(. )](,) ixpctUxt Ade? ?= (3-1) where x... [(. )]ixpct? ? (3-2) 20 A similar representation can be found in Achenbach [20]. Substituting U and ? into Equations 2-15 and 2-16 and eliminating the constant B, we obtain, 2()()(.)cd pdp?? ???++ + 2 22 0 11 2 2 1( ) (.) 0 []v v Tc it c t c...
5. SOUND ATTENUATION 5.1 NATURE OF SOUND WAVE
Cambridge, University of
) refers to how fast the disturbance is passed from particle to particle. While frequency refers, which the disturbance travels per unit of time. Angular frequency defines the number of radians per motion at a given frequency. The frequency of a wave is measured as the number of complete back
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2002-11-08T23:59:59.000Z
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.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2012-04-12T23:59:59.000Z
The order establishes requirements and responsibilities governing official foreign travel by Federal and contractor employees. Cancels DOE O 551.1C.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2008-06-24T23:59:59.000Z
The Order sets forth requirements and responsibilities governing official foreign travel by Federal and contractor employees. Cancels DOE O 551.1B.
Two-dimensional elastic wave propagation in a duraluminum sheet
Cefola, David Paul
1982-01-01T23:59:59.000Z
dimensions should be propor- tional to r eL, where r is the separation between the source and receiver and L is the distance the wave has traveled. along the lower interface. Newlands (1952) investigated the theoretical behavior of refracted waves trs.... 96 313. 17 179. 1a aal. aZ '89. 7a al. , 8 231. 66 236, 9$ ? ? o 52. 12 J J. S9 a. 6, , U 53 where T is the arrival time, X is the source/receiver separation, and. V is the wave velocity. For reflected-P waves in the model, the traveltime...
capacitance (RLC) transmission lines. The time-domain system responses of RLC interconnect lines driving load Transmission Lines Yungseon Eo, Jongin Shim, and William R. Eisenstadt Abstract--Today's high-speed very large. The signal delay models of the RLC interconnect lines are derived as a closed form. The technique is verified
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2012-04-02T23:59:59.000Z
The order establishes DOE requirements and responsibilities governing official foreign travel by Federal and contractor employees. The Pg Chg removes the requirement to surrender official passports and replaces it with a process that requires travelers be responsible for safeguarding their own official passports. Cancels DOE O 551.1D, dated 4-12-12.
Hyperfast Interstellar Travel in General Relativity
S. V. Krasnikov
1998-03-09T23:59:59.000Z
The problem is discussed of whether a traveller can reach a remote object and return back sooner than a photon would when taken into account that the traveller can partly control the geometry of his world. It is argued that under some reasonable assumptions in globally hyperbolic spacetimes the traveller cannot hasten reaching the destination. Nevertheless, it is perhaps possible for him to make an arbitrarily long round-trip within an arbitrarily short (from the point of view of a terrestrial observer) time.
Friction in Gravitational Waves: a test for early-time modified gravity
Valeria Pettorino; Luca Amendola
2015-03-19T23:59:59.000Z
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.
Lee, KyeoReh; Park, Jung-Hoon; Park, Ji-Ho; Park, YongKeun
2015-01-01T23:59:59.000Z
Rewinding the arrow of time via phase conjugation is an intriguing phenomena made possible by the wave property of light. To exploit this phenomenon, many diverse research fields have pursed the realization of an ideal phase conjugation mirror, but the ideal phase conjugation mirror - an optical system that requires a single-input and a single-output beam, like natural conventional mirrors - has never been demonstrated. Here, we demonstrate the realization of a one-wave optical time-reversal mirror using a spatial light modulator and a single-mode reflector. Our method is simple, alignment free, and fast while allowing unlimited power throughput in the time reversed wave, which have not been simultaneously demonstrated before. Using our method, we demonstrate high throughput time-reversal full-field light delivery through highly scattering biological tissue and multimode fibers, even for quantum dot fluorescence.
Existence of a directional Stokes drift in asymmetrical three-dimensional travelling gravity
Iooss, Gérard
, France Lavrentyev Institute of Hydrodynamics, Lavryentyev pr. 15, Novosibirsk 630090, Russia gerard.iooss@unice.fr, plotnikov@hydro.nsc.ru September 4, 2009 Abstract We consider periodic travelling gravity waves], travelling waves exist with an asymptyotic expansion in powers of 1, 2, for nearly all pair of angles made
Deep-water gravity waves: theoretical estimating of wave parameters
Mindlin, Ilia M
2014-01-01T23:59:59.000Z
This paper addresses deep-water gravity waves of finite amplitude generated by an initial disturbance to the water. It is assumed that the horizontal dimensions of the initially disturbed body of the water are much larger than the magnitude of the free surface displacement in the origin of the waves. Initially the free surface has not yet been displaced from its equilibrium position, but the velocity field has already become different from zero. This means that the water at rest initially is set in motion suddenly by an impulse. Duration of formation of the wave origin and the maximum water elevation in the origin are estimated using the arrival times of the waves and the maximum wave-heights at certain locations obtained from gauge records at the locations, and the distances between the centre of the origin and each of the locations. For points situated at a long distance from the wave origin, forecast is made for the travel time and wave height at the points. The forecast is based on the data recorded by th...
Aynur Bulut
2014-09-10T23:59:59.000Z
We establish probabilistic local and global well-posedness results for the nonlinear wave equation, posed on the domain $B_2\\times\\mathbb{T}$, with randomly chosen initial data having radial symmetry in the $B_2$ variable, and with vanishing Dirichlet boundary conditions on $\\partial B_2\\times\\mathbb{T}$.
Real-time Non-contact Millimeter Wave Characterization of Water-Freezing and Ice-Melting Dynamics
Woskov, Paul P.
We applied millimeter wave radiometry for the first time to monitor water-freezing and ice-melting dynamics in real-time non-contact. The measurements were completed at a frequency of 137 GHz. Small amounts (about 2 mL) ...
Shang, Xuefeng
We present a wave equation prestack depth migration to image crust and mantle structures using multi-component earthquake data recorded at dense seismograph arrays. Transmitted P and S waves recorded on the surface are ...
Time-dependent Ginzburg-Landau equations for mixed d- and s-wave superconductors
Zhu, JX; Kim, WK; Ting, CS; Hu, Chia-Ren.
1998-01-01T23:59:59.000Z
is such an approach. PRB 580163-1829/98/58~22!/15020~15!/$15.00 for mixed d- and s-wave superconductors Kim, and C. S. Ting y of Houston, Houston, Texas 77204 n Hu , College Station, Texas 77843 t received 2 July 1998! s ~TDGL! for superconductors of mixed d... 2 2k? y 2 !~ k? x8 2 2k? y8 2 !, ~2.7! D * ~ R,k;v!5Ds*~R;v!1Dd*~R;v!~k? x 2 2k? y 2 !, ~2.8! where Vd and Vs are positive so that both the d- and s- PRB 58 TIME-DEPENDENT GINZBURG-LANDA channel interactions are attractive. The d...
Fast evaluation of far-field signals for time-domain wave propagation
Scott E. Field; Stephen R. Lau
2014-09-20T23:59:59.000Z
Time-domain simulation of wave phenomena on a finite computational domain often requires a fictitious outer boundary. An important practical issue is the specification of appropriate boundary conditions on this boundary, often conditions of complete transparency. Attention to this issue has been paid elsewhere, and here we consider a different, although related, issue: far-field signal recovery. Namely, from smooth data recorded on the outer boundary we wish to recover the far-field signal which would reach arbitrarily large distances. These signals encode information about interior scatterers and often correspond to actual measurements. This article expresses far-field signal recovery in terms of time-domain convolutions, each between a solution multipole moment recorded at the boundary and a sum-of-exponentials kernel. Each exponential corresponds to a pole term in the Laplace transform of the kernel, a finite sum of simple poles. Greengard, Hagstrom, and Jiang have derived the large-$\\ell$ (spherical-harmonic index) asymptotic expansion for the pole residues, and their analysis shows that, when expressed in terms of the exact sum-of-exponentials, large-$\\ell$ signal recovery is plagued by cancellation errors. Nevertheless, through an alternative integral representation of the kernel and its subsequent approximation by a {\\em smaller} number of exponential terms (kernel compression), we are able to alleviate these errors and achieve accurate signal recovery. We empirically examine scaling relations between the parameters which determine a compressed kernel, and perform numerical tests of signal "teleportation" from one radial value $r_1$ to another $r_2$, including the case $r_2=\\infty$. We conclude with a brief discussion on application to other hyperbolic equations posed on non-flat geometries where waves undergo backscatter.
Gupta, Samit Kumar
2015-01-01T23:59:59.000Z
In this work, we have studied the peregrine rogue wave dynamics, with a solitons on finite background (SFB) ansatz, in the recently proposed (Phys. Rev. Lett. 110 (2013) 064105) continuous nonlinear Schrodinger system with parity-time symmetric Kerr nonlinearity. We have found that the continuous nonlinear Schrodinger system with PT-symmetric nonlinearity also admits Peregrine Soliton solution. Motivated by the fact that Peregrine solitons are regarded as prototypical solutions of rogue waves, we have studied Peregrine rogue wave dynamics in the c-PTNLSE model. Upon numerical computation, we observe the appearance of low-intense Kuznetsov-Ma (KM) soliton trains in the absence of transverse shift (unbroken PT-symmetry) and well-localized high-intense Peregrine Rogue waves in the presence of transverse shift (broken PT-symmetry) in a definite parametric regime.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2000-01-31T23:59:59.000Z
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.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2000-08-25T23:59:59.000Z
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.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2003-08-19T23:59:59.000Z
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.
Yasui, Takeshi; Ichikawa, Ryuji; Cahyadi, Harsono; Hsieh, Yi-Da; Mizutani, Yasuhiro; Yamamoto, Hirotsugu; Iwata, Tetsuo; Inaba, Hajime; Minoshima, Kaoru
2015-01-01T23:59:59.000Z
Real-time measurement of the absolute frequency of continuous-wave terahertz (CW-THz) waves is required for characterization and frequency calibration of practical CW-THz sources. We proposed a method for real-time monitoring of the absolute frequency of CW-THz waves involving temporally parallel, i.e., simultaneous, measurement of two pairs of beat frequencies and laser repetition frequencies based on dual THz combs of photocarriers (PC-THz combs) with different frequency spacings. To demonstrate the method, THz-comb-referenced spectrum analyzers were constructed with a dual configuration based on dual femtosecond lasers. Regardless of the presence or absence of frequency control in the PC-THz combs, a frequency precision of 10-11 was achieved at a measurement rate of 100 Hz. Furthermore, large fluctuation of the CW-THz frequencies, crossing several modes of the PC-THz combs, was correctly monitored in real time. The proposed method will be a powerful tool for the research and development of practical CW-THz...
Pre-Stack Depth Migration and Attribute Analysis of 3-D Time-Lapse P-wave Data
Pre-Stack Depth Migration and Attribute Analysis of 3-D Time-Lapse P-wave Data Vacuum Field, New the application of Pre-Stack Depth Migration (PSDM) and innovative window-based attribute analysis applied to 4-D seismic data. The data were acquired in Central Vacuum Unit, Lea County, New Mexico by the Reservoir
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
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.
Othman Ahmad; Aroland Kiring; Ali Chekima
2012-10-17T23:59:59.000Z
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.
P- and S-body wave tomography of the state of Nevada.
Preston, Leiph
2010-04-01T23:59:59.000Z
P- and S-body wave travel times collected from stations in and near the state of Nevada were inverted for P-wave velocity and the Vp/Vs ratio. These waves consist of Pn, Pg, Sn and Sg, but only the first arriving P and S waves were used in the inversion. Travel times were picked by University of Nevada Reno colleagues and were culled for inclusion in the tomographic inversion. The resulting tomographic model covers the entire state of Nevada to a depth of {approx}90 km; however, only the upper 40 km indicate relatively good resolution. Several features of interest are imaged including the Sierra Nevada, basin structures, and low velocities at depth below Yucca Mountain. These velocity structure images provide valuable information to aide in the interpretation of geothermal resource areas throughout the state on Nevada.
Wang Dengshan [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); CEMA, Central University of Finance and Economics, Beijing 100081 (China); Hu Xinghua; Liu, W. M. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
2010-08-15T23:59:59.000Z
We investigate the localized nonlinear matter waves in the two-component Bose-Einstein condensates with time- and space-modulated nonlinearities analytically and numerically. The similarity transformations are developed to solve the coupled Gross-Pitaevskii equations and two families of explicitly exact solutions are derived. Our results show that not only the attractive spatiotemporal inhomogeneous interactions but the repulsive ones support novel localized nonlinear matter waves in two-component Bose-Einstein condensates. The dynamics of these matter waves, including the breathing solitons, quasibreathing solitons, resonant solitons, and moving solitons, is discussed. We confirm the stability of the exact solutions by adding various initial stochastic noise and study the general cases of the interaction parameters numerically. We also provide the experimental parameters to produce these phenomena in future experiments.
Nagaraj, Mahavir
2004-11-15T23:59:59.000Z
The generalized theory of thermoelasticity was employed to characterize the coupled thermal and mechanical wave propagation in high performance microelectronic packages. Application of a Gaussian heat source of spectral ...
Particle and Wave: Developing the Quantum Wave Accompanying a Classical Particle
C. L. Herzenberg
2008-12-04T23:59:59.000Z
The relationship between classical and quantum mechanics is explored in an intuitive manner by the exercise of constructing a wave in association with a classical particle. Using special relativity, the time coordinate in the frame of reference of a moving particle is expressed in terms of the coordinates in the laboratory frame of reference in order to provide an initial spatiotemporal function to work from in initiating the development of a quantum wave. When temporal periodicity is ascribed to the particle, a provisional spatiotemporal function for a particle travelling at constant velocity manifests itself as an running wave characterized by parameters associated with the moving particle. A wave description for bidirectional motion is generated based on an average time coordinate for a combination of oppositely directed elementary running waves, and the resulting spatiotemporal function exhibits wave behavior characteristic of a standing wave. Ascribing directional orientation to the intrinsic periodicity of the particle introduces directional sub-states; variations in the relative number of sub-states as a function of angle in combined states lead to spatially varying magnitudes for the associated waves. Further analysis leads to full mathematical expression for all waves representing free particle motion. A generalization for particles subject to force fields enables us to develop a governing differential equation identical in form to the Schroedinger equation.
Reporting Unofficial Foreign Travel
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2000-12-15T23:59:59.000Z
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.
Ahmad, Othman; Chekima, Ali
2011-01-01T23:59:59.000Z
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 allo...
NADIM-Travel: A Multiagent Platform for Travel Services Aggregation
Kropf, Peter
services aggregators are increasingly in demand. A travel services aggregation platform should be able-coordinator agent manages users' requests as well as the response aggregation process. Service agents, on their partNADIM-Travel: A Multiagent Platform for Travel Services Aggregation Houssein Ben-Ameur a , François
Sakakibara, Y.; Yamamoto, K.; Chen, D.; Tokoku, C.; Uchiyama, T.; Ohashi, M.; Kuroda, K. [Institute for Cosmic Ray Research (ICRR), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582 (Japan); Kimura, N.; Suzuki, T.; Koike, S. [High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)
2014-01-29T23:59:59.000Z
In interferometric cryogenic gravitational wave detectors, there are plans to cool mirrors and their suspension systems (payloads) in order to reduce thermal noise, that is, one of the fundamental noise sources. Because of the large payload masses (several hundred kg in total) and their thermal isolation, a cooling time of several months is required. Our calculation shows that a high-emissivity coating (e.g. a diamond-like carbon (DLC) coating) can reduce the cooling time effectively by enhancing radiation heat transfer. Here, we have experimentally verified the effect of the DLC coating on the reduction of the cooling time.
Y. Sakakibara; N. Kimura; T. Suzuki; K. Yamamoto; D. Chen; S. Koike; C. Tokoku; T. Uchiyama; M. Ohashi; K. Kuroda
2013-09-19T23:59:59.000Z
In interferometric cryogenic gravitational wave detectors, there are plans to cool mirrors and their suspension systems (payloads) in order to reduce thermal noise, that is, one of the fundamental noise sources. Because of the large payload masses (several hundred kg in total) and their thermal isolation, a cooling time of several months is required. Our calculation shows that a high-emissivity coating (e.g. a diamond-like carbon (DLC) coating) can reduce the cooling time effectively by enhancing radiation heat transfer. Here, we have experimentally verified the effect of the DLC coating on the reduction of the cooling time.
Travel Reimbursement Request Form Submit to: Front Desk
Loudon, Catherine
Travel Reimbursement Request Form Submit to: Front Desk Department of Pharmaceutical Sciences 147 : Maximum: $71.00 (Itemize meal expenses) If travel time does not include overnight stay (between 7AM - 8PM; lunch - departure before 11 AM and arrival after 2 PM; dinner - departure before 5 PM. PM and arrival
Focusing Waves at Arbitrary Locations in a Ray-Chaotic Enclosure Using Time-Reversed Synthetic Sonas
Bo Xiao; Thomas M. Antonsen; Edward Ott; Steven M. Anlage
2015-06-30T23:59:59.000Z
Time reversal methods are widely used to achieve wave focusing in acoustics and electromagnetics. A typical time reversal experiment requires that a transmitter be initially present at the target focusing point, which limits the application of this technique. In this paper, we propose a method to focus waves at an arbitary location inside a complex enclosure using a numerically calculated wave excitation signal. We use a semi-classical ray algorithm to calculate the signal that would be received at a transceiver port resulting from the injection of a short pulse at the desired target location. The time-reversed version of this signal is then injected into the transceiver port and an approximate reconstruction of the short pulse is created at the target. The quaility of the pulse reconstruction is quantified in three different ways and the values of these metrics are predicted by the statistics of the scattering-parameter $|S_{21}|^2$ between the transceiver and target points in the enclosure. We experimentally demonstrate the method using a flat microwave billiard and quantify the reconstruction quality as a function of enclosure loss, port coupling and other considerations.
University of Bath Travel Survey Spring 2013
Burton, Geoffrey R.
.3% of all respondents were aware of the car-share parking permits, and 11.5% were aware of the electric car & Interest in Car-sharing scheme use......................................19 Support for methods of reducing.1% travelling 6 or 7 times a week) Reasons for car use focus on perceived inadequacy of bus services. Bus users
EXPENDITURE OBJECT CODES Travel TRAVEL includes expenditures to pay for travel expenses.
Harms, Kyle E.
, 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
ASYMPTOTICS FOR SOME NONLINEAR DAMPED WAVE EQUATION: FINITE TIME CONVERGENCE VERSUS
Díaz, Jesús Ildefonso
of friction problems. Among them, the case = | . |L1 corresponds to a Coulomb friction, equal to the opposite. 35B40, 35L70, 34A60, 74J30, 74M10. Key words and phrases. Damped wave equation, dry friction, second´et´e de probl`emes avec frottement. Le cas = | . |L1 correspond au frottement de Coulomb, ´egal `a l
FURTHER INVESTIGATION OF PARAMETERS AFFECTING WATER HAMMER WAVE ATTENUATION, SHAPE AND TIMING
Eindhoven, Technische Universiteit
unsteady friction and viscoelastic behaviour of pipe walls are compared with the results of measurements College, London, United Kingdom. The example piping system used for investigating water hammer wave forms. The apparatus is installed in 1 #12;Robin hydraulic laboratory of the Department of Civil and Environmental
Quantum wave packets in space and time and an improved criterion for classical behavior
C. L. Herzenberg
2009-04-28T23:59:59.000Z
An improved criterion for distinguishing conditions in which classical or quantum behavior occurs is developed by comparing classical and quantum mechanical measures of size while incorporating spatial and temporal restrictions on wave packet formation associated with limitations on spatial extent and duration.
An Exact, Three-Dimensional, Time-Dependent Wave Solution in Local Keplerian Flow
Steven A. Balbus; John F. Hawley
2006-08-21T23:59:59.000Z
We present an exact three-dimensional wave solution to the shearing sheet equations of motion. The existence of this solution argues against transient amplification as a route to turbulence in unmagnetized disks. Moreover, because the solution covers an extensive dynamical range in wavenumber space, it is an excellent test of the dissipative properties of numerical codes.
Wang, Yan; Mohanty, Soumya D.; Jenet, Fredrick A. [Department of Physics and Astronomy, University of Texas at Brownsville, 1 West University Boulevard, Brownsville, TX 78520 (United States)
2014-11-01T23:59:59.000Z
The use of a high precision pulsar timing array is a promising approach to detecting gravitational waves in the very low frequency regime (10{sup –6}-10{sup –9} Hz) that is complementary to ground-based efforts (e.g., LIGO, Virgo) at high frequencies (?10-10{sup 3} Hz) and space-based ones (e.g., LISA) at low frequencies (10{sup –4}-10{sup –1} Hz). One of the target sources for pulsar timing arrays is individual supermassive black hole binaries which are expected to form in galactic mergers. In this paper, a likelihood-based method for detection and parameter estimation is presented for a monochromatic continuous gravitational wave signal emitted by such a source. The so-called pulsar terms in the signal that arise due to the breakdown of the long-wavelength approximation are explicitly taken into account in this method. In addition, the method accounts for equality and inequality constraints involved in the semi-analytical maximization of the likelihood over a subset of the parameters. The remaining parameters are maximized over numerically using Particle Swarm Optimization. Thus, the method presented here solves the monochromatic continuous wave detection and parameter estimation problem without invoking some of the approximations that have been used in earlier studies.
Real-time Non-contact Millimeter Wave Characterization of Water-Freezing and Ice-Melting Dynamics
Sundaram, S. K.; Woskov, Paul P.
2008-11-12T23:59:59.000Z
We applied millimeter wave radiometry for the first time to monitor water-freezing and ice-melting dynamics in real-time non-contact. The measurements were completed at a frequency of 137 GHz. Small amounts (about 2 mL) of freshwater or saltwater were frozen over a Peltier cooler and the freezing and melting sequence was recorded. Saltwater was prepared in the laboratory that contained 3.5% of table salt to simulate the ocean water. The dynamics of freezing-melting was observed by measuring the millimeter wave temperature as well as the changes in the ice or water surface reflectivity and position. This was repeated using large amounts of freshwater and saltwater (800 mL) mimicking glaciers. Millimeter wave surface level fluctuations indicated as the top surface melted, the light ice below floated up indicating lower surface temperature until the ice completely melted. Our results are useful for remote sensing and tracking temperature for potentially large-scale environmental applications, e.g., global warming.
Travel Trends Using the Puget Sound Panel Survey: A Generalized Estimating Equations Approach
Yee, Julie; Niemeier, Debbie
1998-01-01T23:59:59.000Z
panel survey for the Puget Sound Region. Trans portationTravel trends using the Puget Sound Panel Table 18. Wave 1longitudinal data from the Puget Sound Transportation Panel.
Panek, Petr; Prochazka, Ivan [Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Chaberska 57, 182 51 Prague (Czech Republic)
2007-09-15T23:59:59.000Z
This article deals with the time interval measurement device, which is based on a surface acoustic wave (SAW) filter as a time interpolator. The operating principle is based on the fact that a transversal SAW filter excited by a short pulse can generate a finite signal with highly suppressed spectra outside a narrow frequency band. If the responses to two excitations are sampled at clock ticks, they can be precisely reconstructed from a finite number of samples and then compared so as to determine the time interval between the two excitations. We have designed and constructed a two-channel time interval measurement device which allows independent timing of two events and evaluation of the time interval between them. The device has been constructed using commercially available components. The experimental results proved the concept. We have assessed the single-shot time interval measurement precision of 1.3 ps rms that corresponds to the time of arrival precision of 0.9 ps rms in each channel. The temperature drift of the measured time interval on temperature is lower than 0.5 ps/K, and the long term stability is better than {+-}0.2 ps/h. These are to our knowledge the best values reported for the time interval measurement device. The results are in good agreement with the error budget based on the theoretical analysis.
Lovley, Derek
. 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
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
Chasing 5-sigma: Prospects for searches for long-duration gravitational-waves without time slides
Coughlin, Michael; Kandhasamy, Shivaraj; Thrane, Eric; Christensen, Nelson
2015-01-01T23:59:59.000Z
The detection of unmodeled gravitational-wave bursts by ground-based interferometric gravitational-wave detectors is a major goal for the advanced detector era. These searches are commonly cast as pattern recognition problems, where the goal is to identify statistically significant clusters in spectrograms of strain power when the precise signal morphology is unknown. In previous work, we have introduced a clustering algorithm referred to as "seedless clustering," and shown that it is a powerful tool for detecting weak long-lived (10-1000s) signals in background. However, as the algorithm is currently conceived, in order to carry out an all-sky search on a $\\approx$ year of data, significant computational resources may be required in order to carry out background estimation. Alternatively, some of the sensitivity of the search must be sacrificed to control computational costs. The sensitivity of the algorithm is limited by the amount of computing resources due to the requirement of performing background studi...
Constraining dark matter late-time energy injection: decays and p-wave annihilations
Diamanti, Roberta; Mena, Olga; Palomares-Ruiz, Sergio; Vincent, Aaron C. [Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València, Apartado de Correos 22085, E-46071 Valencia (Spain); Lopez-Honorez, Laura, E-mail: R.Diamanti@uva.nl, E-mail: llopezho@vub.ac.be, E-mail: omena@ific.uv.es, E-mail: sergio.palomares.ruiz@ific.uv.es, E-mail: vincent@ific.uv.es [Theoretische Natuurkunde Vrije Universiteit Brussel and The International Solvay Institutes Pleinlaan 2, B-1050 Brussels (Belgium)
2014-02-01T23:59:59.000Z
We use the latest cosmic microwave background (CMB) observations to provide updated constraints on the dark matter lifetime as well as on p-wave suppressed annihilation cross sections in the 1 MeV to 1 TeV mass range. In contrast to scenarios with an s-wave dominated annihilation cross section, which mainly affect the CMB close to the last scattering surface, signatures associated with these scenarios essentially appear at low redshifts (z?<50) when structure began to form, and thus manifest at lower multipoles in the CMB power spectrum. We use data from Planck, WMAP9, SPT and ACT, as well as Lyman–? measurements of the matter temperature at z ? 4 to set a 95% confidence level lower bound on the dark matter lifetime of ? 4 × 10{sup 25} s for m{sub ?} = 100 MeV. This bound becomes lower by an order of magnitude at m{sub ?} = 1 TeV due to inefficient energy deposition into the intergalactic medium. We also show that structure formation can enhance the effect of p-wave suppressed annihilation cross sections by many orders of magnitude with respect to the background cosmological rate, although even with this enhancement, CMB constraints are not yet strong enough to reach the thermal relic value of the cross section.
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), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of WntSupportB 18B()The57Toward 300searchTransportationEHSSTravelTravel
Southworth, Frank [ORNL; Garrow, Dr. Laurie [Georgia Institute of Technology
2011-01-01T23:59:59.000Z
This chapter describes the principal types of both passenger and freight demand models in use today, providing a brief history of model development supported by references to a number of popular texts on the subject, and directing the reader to papers covering some of the more recent technical developments in the area. Over the past half century a variety of methods have been used to estimate and forecast travel demands, drawing concepts from economic/utility maximization theory, transportation system optimization and spatial interaction theory, using and often combining solution techniques as varied as Box-Jenkins methods, non-linear multivariate regression, non-linear mathematical programming, and agent-based microsimulation.
Fusion reaction of halo nuclei: A real-time wave-packet method for three-body tunneling dynamics
T. Nakatsukasa; M. Ito; K. Yabana; M. Ueda
2006-05-12T23:59:59.000Z
We investigate fusion cross section of a nucleus with a valence neutron, using the time-dependent wave-packet method. For a stable projectile, in which the valence neutron is tightly bound (e_n fusion probability when the matching condition of orbital energies are satisfied. In contrast, for a halo nucleus, in which the binding energy of the neutron is very small (e_n>-1 MeV), the fusion probability is hindered by the presence of the weakly bound neutron.
SOLITARY WAVE INTERACTION IN A COMPACT EQUATION FOR DEEP-WATER GRAVITY WAVES
Boyer, Edmond
SOLITARY WAVE INTERACTION IN A COMPACT EQUATION FOR DEEP-WATER GRAVITY WAVES FRANCESCO FEDELE of the Zakharov equation for unidirectional deep-water waves recently derived by Dyachenko & Zakharov [7-conserving quantities. Key words and phrases. water waves; deep water approximation; Hamiltonian structure; travelling
Wave-pinned filaments of scroll waves Tams Bnsgi, Jr., Kevin J. Meyer, and Oliver Steinbocka
Steinbock, Oliver
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
WAVE PROPAGATION AND JET FORMATION IN THE CHROMOSPHERE
Heggland, L.; Hansteen, V. H.; Carlsson, M. [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, N-0315 Oslo (Norway); De Pontieu, B., E-mail: lars.heggland@astro.uio.no [Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Organization ADBS, Building 252, Palo Alto, CA 94304 (United States)
2011-12-20T23:59:59.000Z
We present the results of numerical simulations of wave propagation and jet formation in solar atmosphere models with different magnetic field configurations. The presence in the chromosphere of waves with periods longer than the acoustic cutoff period has been ascribed to either strong inclined magnetic fields, or changes in the radiative relaxation time. Our simulations include a sophisticated treatment of radiative losses, as well as fields with different strengths and inclinations. Using Fourier and wavelet analysis techniques, we investigate the periodicity of the waves that travel through the chromosphere. We find that the velocity signal is dominated by waves with periods around 5 minutes in regions of strong, inclined field, including at the edges of strong flux tubes where the field expands, whereas 3 minute waves dominate in regions of weak or vertically oriented fields. Our results show that the field inclination is very important for long-period wave propagation, whereas variations in the radiative relaxation time have little effect. Furthermore, we find that atmospheric conditions can vary significantly on timescales of a few minutes, meaning that a Fourier analysis of wave propagation can be misleading. Wavelet techniques take variations with time into account and are more suitable analysis tools. Finally, we investigate the properties of jets formed by the propagating waves once they reach the transition region, and find systematic differences between the jets in inclined-field regions and those in vertical field regions, in agreement with observations of dynamic fibrils.
Time-dependent Ginzburg-Landau equations for mixed d- and s-wave superconductors
Zhu, JX; Kim, WK; Ting, CS; Hu, Chia-Ren.
1998-01-01T23:59:59.000Z
in the past to study the vortex dynamics in conventional superconductors.8 E? liashberg9 has later derived a more com- plex set of TDGL equations for low-Tc s-wave supercon- ductors assuming only the weak gaplessness condition @i.e., tsD0!1, where D0(T... FOR THE ORDER PARAMETERS We begin with the Gor?kov equations:13 F 2 ] ]t 2h ~ xt! G G ab ~ xt ,x 8 t 8 !2U ag ~ x!G gb ~ xt ,x 8 t 8 ! 1 E dx 9 D ag ~ xt01,x 9 t!F gb ? ~ x 9 t ,x 8 t 8 ! 5d ~ x2x 8 !d~ t2t 8...
Stratified Steady Periodic Water Waves
Samuel Walsh
2009-02-11T23:59:59.000Z
This paper considers two-dimensional stratified water waves propagating under the force of gravity over an impermeable flat bed and with a free surface. We prove the existence of a global continuum of classical solutions that are periodic and traveling. These waves, moreover, can exhibit large density variation, speed and amplitude.
2001-01-01T23:59:59.000Z
Real-Time Laser-Based Non-Intrusive Detection System forReal-Time Laser-Based Non-Intrusive Detection System foroptics. The laser-based non-intrusive detection system uses
Instability of large solitary water waves
Zhiwu Lin
2008-03-03T23:59:59.000Z
We consider the linearized instability of 2D irrotational solitary water waves. The maxima of energy and the travel speed of solitary waves are not obtained at the highest wave, which has a 120 degree angle at the crest. Under the assumption of non-existence of secondary bifurcation which is confirmed numerically, we prove linear instability of solitary waves which are higher than the wave of maximal energy and lower than the wave of maximal travel speed. It is also shown that there exist unstable solitary waves approaching the highest wave. The unstable waves are of large amplitude and therefore this type of instability can not be captured by the approximate models derived under small amplitude assumptions. For the proof, we introduce a family of nonlocal dispersion operators to relate the linear instability problem with the elliptic nature of solitary waves. A continuity argument with a moving kernel formula is used to study these dispersion operators to yield the instability criterion.
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), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 SharesAdministration About Us /2012 Employee
Inversion Of Travel Time For Velocity
Willis, M.E.
1983-01-01T23:59:59.000Z
Common source velocities and borehole compensated (BC) estimates have been used to obtain formation velocity estimates from full waveform acoustic
Travel Time Tomography and Tensor Tomography, III
Plamen Stefanov
2009-07-31T23:59:59.000Z
Sx M. |?(x, ?)|2?(? · ?) d?(?). For tensors, the “weight” is ?i ?j . We get that the principal symbol in that case is ?p(N)ijkl (x, ?)=2?. Z. Sx M ?i ?j ?k ?l ?(? · ?) d?(?).
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
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.
Paris-Sud XI, Université de
for the prevention of dynamic phenomena is an integral part of a strategy for exploring zones where there are risks, and the mine layout, all playing a significant contribution to the rate of seismic energy released. In order, powerfui Software has been installed in order to provide for high quality, real time microseismic
van Manen, Dirk-Jan
2006-01-01T23:59:59.000Z
In exploration seismics and non-destructive evaluation, acoustic, elastic and electro-magnetic waves sensitive to inhomogeneities in the medium under investigation are used to probe its interior. Waves multiply scattered ...
Raghunathan, Shampa; Nest, Mathias [Theoretische Chemie, TU Muenchen, Lichtenbergstr. 4, 85747 Garching (Germany)
2012-02-14T23:59:59.000Z
Explicitly time-dependent density functional theory (TDDFT) is a formally exact theory, which can treat very large systems. However, in practice it is used almost exclusively in the adiabatic approximation and with standard ground state functionals. Therefore, if combined with coherent control theory, it is not clear which control tasks can be achieved reliably, and how this depends on the functionals. In this paper, we continue earlier work in order to establish rules that answer these questions. Specifically, we look at the creation of wave packets by ultrashort laser pulses that contain several excited states. We find that (i) adiabatic TDDFT only works if the system is not driven too far from the ground state, (ii) the permanent dipole moments involved should not differ too much, and (iii) these results are independent of the functional used. Additionally, we find an artifact that produces fluence-dependent excitation energies.
Effects of Personalized Travel Destination Visual Image on Travel Motivation
Lee, Gwanggyu 1981-
2012-11-12T23:59:59.000Z
studies suggest that emotion (Park, Lennon, & Stoel, 2005; Tudoran, Olsen, & Dopico, 2012; Zhang, Lu, Shi, Tang, & Zhao, 2012) and travel motivation affect purchase intention, and emotion is affected by personalization (Saari, Ravaja, Laarni, Turpeinen... (2011) have studied the relationship between travel motivation and photos. H2a: Personalized TDVI positively affects emotion Emotion has been found to be influenced by personalization (Saari et al., 2004; Sirgy & Danes, 1982). In this research...
Time series analysis of ionization waves in dc neon glow discharge
Hassouba, M. A.; Al-Naggar, H. I.; Al-Naggar, N. M.; Wilke, C. [Department of Physics, Faculty of Science, Benha University (Egypt); Institute of Physics, E. M. A. University, Domstrasse 10a, 17489 Greifswald (Germany)
2006-07-15T23:59:59.000Z
The dynamics of dc neon glow discharge is examined by calculating a Lyapunov exponent spectrum (LES) and correlation dimension (D{sub corr}) from experimental time series. The embedding theory is used to reconstruct an attractor with the delay coordinate method. The analysis refers to periodic, chaotic, and quasi-periodic attractors. The results obtained are confirmed by a comparison with other methods of time series analysis such as the Fourier power spectrum and autocorrelation function. The main object of the present work is the positive column of a dc neon glow discharge. The positive column is an excellent model for the study of a non-linearity plasma system because it is nonisothermal plasma far from equilibrium.
and dairy products. Avoid Insect Bites Some serious infectious diseases such as malaria, dengue fever and yellow fever are transmitted by insect bites. You should always protect yourself from mosquito bites. l to have certain vaccinations such as yellow fever. You can research what vaccinations for travelers
Molten metal feed system controlled with a traveling magnetic field
Praeg, Walter F. (Palos Park, IL)
1991-01-01T23:59:59.000Z
A continuous metal casting system in which the feed of molten metal is controlled by means of a linear induction motor capable of producing a magnetic traveling wave in a duct that connects a reservoir of molten metal to a caster. The linear induction motor produces a traveling magnetic wave in the duct in opposition to the pressure exerted by the head of molten metal in the reservoir so that p.sub.c =p.sub.g -p.sub.m where p.sub.c is the desired pressure in the caster, p.sub.g is the gravitational pressure in the duct exerted by the force of the head of molten metal in the reservoir, and p.sub.m is the electromagnetic pressure exerted by the force of the magnetic field traveling wave produced by the linear induction motor. The invention also includes feedback loops to the linear induction motor to control the casting pressure in response to measured characteristics of the metal being cast.
Chapter 10: Waves Did you read chapter 10
Hart, Gus
20 19 18 17 16 15 14 13 12 Multiple Choice Scores Frequency Wave concepts Waves are a "disturbance" that travels (usually through a material). They carry energy away from a source. The disturbance with the energy of the wave · loudness (sound) · brightness (light) Amplitude Wave Properties: Frequency
POINTWISE GREEN FUNCTION BOUNDS AND STABILITY OF COMBUSTION WAVES
Texier, Benjamin - Institut de Mathématiques de Jussieu, Université Paris 7
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
2001 New York State NHTS: Travel Patterns of Special Populations
Hu, Patricia S [ORNL; Reuscher, Tim [ORNL
2010-03-01T23:59:59.000Z
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.
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
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.
Does Neighborhood Design Influence Travel? A Behavioral Analysis of Travel Diary and GIS Data
Crane, Randall; Crepeau, Richard
1998-01-01T23:59:59.000Z
Analysis of Travel Diary and GIS Data R andall Crane 1Analysis of Travel Diary and GIS Data ? Randall Craneof household travel diary and GIS data for San Diego finds
Analysis of Automobile Travel Demand Elasticities with Respect to Travel Cost
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
Snieder, Roel
chaol- ogy.'' The relation between classical chaos and quantum chaos is not trivial 3 . For classical phenomena 4 . Although many aspects of the relation between classical chaos and quantum chaosTime-reversed imaging as a diagnostic of wave and particle chaos R. K. Snieder1,2,* and J. A
On expansion of equal-time relativistic two-body wave equations in powers of 1/c to higher orders
Alexei Turovsky
2012-11-29T23:59:59.000Z
Based on an extension of the Foldy--Wouthuysen method to two-body equations, the problem of expansion of equal-time relativistic equations for two Dirac particles in powers of $1/c$ to higher orders is considered. For the case of two particles with unequal masses, the transformed Hamiltonian in a general even-even form is obtained to order $1/c^4$. It is found that certain extra terms, which can be eliminated by an additional unitary transformation, arise in the expansion in higher orders, depending on the order of application of the generating functions in the first iteration. As examples for illustration, the Breit equation and the Salpeter equation with the Breit interaction are taken and their reduction to approximate forms including all the $1/c^{4}$-order terms is carried out using the method under consideration. The obtained results may be applied for the nonrelativistic expansion of two-body wave equations with various interaction potentials to higher orders, for the investigation of their features and symmetries, and may also be useful in the study of light atoms.
Arnold, Jonathan
ACCESSING ROAD TRAVEL REPORTS The safest traveler is the well-informed traveler. While road safety of countries will appear and you can view each road travel report by clicking "Download Now". #12;
Salah Menouar; Mustapha Maamache; Jeong Ryeol Choi
2010-10-14T23:59:59.000Z
A general treatment of the quantal time-dependent coupled oscillators in presence of the variable magnetic field is presented. The treatment is based on the use of an alternative canonical transformations, time-dependent unitary transformations and the invariant methods. Exact wave functions for Schr\\"{o}dinger equations of this system are constructed.We applied our theory to a particular case and, co,sequently, showed that our results recovers to the perviously known one.
Spatiotemporal synchronization of drift waves in a magnetron sputtering plasma
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
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.
Latham A. Boyle; Alessandra Buonanno
2007-08-18T23:59:59.000Z
We derive a general master equation relating the gravitational-wave observables r and Omega_gw(f). Here r is the tensor-to-scalar ratio, constrained by cosmic-microwave-background (CMB) experiments; and Omega_gw(f) is the energy spectrum of primordial gravitational-waves, constrained e.g. by pulsar-timing measurements, laser-interferometer experiments, and Big Bang Nucleosynthesis (BBN). Differentiating the master equation yields a new expression for the tilt d(ln Omega_gw(f))/d(ln f). The relationship between r and Omega_gw(f) depends sensitively on the uncertain physics of the early universe, and we show that this uncertainty may be encapsulated (in a model-independent way) by two quantities: w_hat(f) and nt_hat(f), where nt_hat(f) is a certain logarithmic average over nt(k) (the primordial tensor spectral index); and w_hat(f) is a certain logarithmic average over w_tilde(a) (the effective equation-of-state in the early universe, after horizon re-entry). Here the effective equation-of-state parameter w_tilde(a) is a combination of the ordinary equation-of-state parameter w(a) and the bulk viscosity zeta(a). Thus, by comparing constraints on r and Omega_gw(f), one can obtain (remarkably tight) constraints in the [w_hat(f), nt_hat(f)] plane. In particular, this is the best way to constrain (or detect) the presence of a ``stiff'' energy component (with w > 1/3) in the early universe, prior to BBN. Finally, although most of our analysis does not assume inflation, we point out that if CMB experiments detect a non-zero value for r, then we will immediately obtain (as a free by-product) a new upper bound w_hat < 0.55 on the logarithmically averaged effective equation-of-state parameter during the ``primordial dark age'' between the end of inflation and the start of BBN.
Julia, J; Nyblade, A; Hansen, S; Rodgers, A; Matzel, E
2009-07-06T23:59:59.000Z
In this project, we are developing models of lithospheric structure for a wide variety of tectonic regions throughout Eurasia and the Middle East by regionalizing 1D velocity models obtained by jointly inverting P-wave and S-wave receiver functions with Rayleigh wave group and phase velocities. We expect the regionalized velocity models will improve our ability to predict travel-times for local and regional phases, such as Pg, Pn, Sn and Lg, as well as travel-times for body-waves at upper mantle triplication distances in both seismic and aseismic regions of Eurasia and the Middle East. We anticipate the models will help inform and strengthen ongoing and future efforts within the NNSA labs to develop 3D velocity models for Eurasia and the Middle East, and will assist in obtaining model-based predictions where no empirical data are available and for improving locations from sparse networks using kriging. The codes needed to conduct the joint inversion of P-wave receiver functions (PRFs), S-wave receiver functions (SRFs), and dispersion velocities have already been assembled as part of ongoing research on lithospheric structure in Africa. The methodology has been tested with synthetic 'data' and case studies have been investigated with data collected at an open broadband stations in South Africa. PRFs constrain the size and S-P travel-time of seismic discontinuities in the crust and uppermost mantle, SRFs constrain the size and P-S travel-time of the lithosphere-asthenosphere boundary, and dispersion velocities constrain average S-wave velocity within frequency-dependent depth-ranges. Preliminary results show that the combination yields integrated 1D velocity models local to the recording station, where the discontinuities constrained by the receiver functions are superimposed to a background velocity model constrained by the dispersion velocities. In our first year of this project we will (i) generate 1D velocity models for open broadband seismic stations in the western half of the study area (Eurasia and the Middle East) and (ii) identify well located seismic events with event-station paths isolated to individual tectonic provinces within the study area and collect broadband waveforms and source parameters for the selected events. The 1D models obtained from the joint inversion will then be combined with published geologic terrain maps to produce regionalized models for distinctive tectonic areas within the study area, and the models will be validated through full waveform modeling of well-located seismic events recorded at local and regional distances.
Sugawara, Yoshihiko
2007-01-01T23:59:59.000Z
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 ...
Chiara M. F. Mingarelli; Trevor Sidery
2014-08-28T23:59:59.000Z
One of the primary objectives for Pulsar Timing Arrays (PTAs) is to detect a stochastic background generated by the incoherent superposition of gravitational waves (GWs), in particular from the cosmic population of supermassive black hole binaries. Current stochastic background searches assume that pulsars in a PTA are separated from each other and the Earth by many GW wavelengths. As more millisecond pulsars are discovered and added to PTAs, some may be separated by only a few radiation wavelengths or less, resulting in correlated GW phase changes between close pulsars in the array. Here we investigate how PTA overlap reduction functions (ORFs), up to quadrupole order, are affected by these additional correlated phase changes, and how they are in turn affected by relaxing the assumption that all pulsars are equidistant from the solar system barycenter. We find that in the low frequency GW background limit of $f\\sim10^{-9}$~Hz, and for pulsars at varying distances from the Earth, that these additional correlations only affect the ORFs by a few percent for pulsar pairs at large angular separations, as expected. However when nearby (order 100 pc) pulsars are separated by less than a few degrees, the correlated phase changes can introduce variations of a few tens of percent in the magnitude of the isotropic ORF, and much larger fractional differences in the anisotropic ORFs-- up to 188 in the $m=0$, $l=2$ ORF for equidistant pulsars separated by 3 degrees. In fact, the magnitude of most of the anisotropic ORFs is largest at small, but non-zero, pulsar separations. Finally, we write down a small angle approximation for the correlated phase changes which can easily be implemented in search pipelines, and for completeness, examine the behavior of the ORFs for pulsars which lie at a radiation wavelength from the Earth.
Balanced Growth, Travel Demand, and Physical Activity
Cervero, Robert; Duncan, Michael
2006-01-01T23:59:59.000Z
and Travel Patterns in the Puget Sound Transportation Panel.travel diary data from the Puget Sound area, Krizek foundhowever. In a study in the Puget Sound, Frank and Pivo (
Anomalous shear wave delays and surface wave velocities at Yellowstone Caldera, Wyoming
Daniel, R.G.; Boore, D.M.
1982-04-10T23:59:59.000Z
To investigate the effects of a geothermal area on the propagation of intermediate-period (1--30 s) teleseismic body waves and surface waves, a specially designed portable seismograph system was operated in Yellowstone Caldera, Wyoming. Travel time residuals, relative to a station outside the caldera, of up to 2 s for compressional phases are in agreement with short-period residuals for P phases measured by other investigators. Travel time delays for shear arrivals in the intermediate-period band range from 2 to 9 s and decrease with increasing dT/d..delta... Measured Rayleigh wave phase velocities are extremely low, ranging from 3.2 km/s at 27-s period to 2.0 km/s at 7-s period; the estimated uncertainty associated with these values is 15%. We propose a model for compressional and shear velocities and Poisson's ratio beneath the Yellowstone caldera which fits the teleseismic body and surface wave data: it consists of a highly anomalous crust with an average shear velocity of 3.0 km/s overlying an upper mantle with average velocity of 4.1 km/s. The high average value of Poisson's ratio in the crust (0.34) suggests the presence of fluids there; Poisson's ratio in the mantle between 40 and approximately 200 km is more nearly normal (0.29) than in the crust. A discrepancy between normal values of Poisson's ratio in the crust calculated from short-period data and high values calculated from teleseismic data can be resolved by postulating a viscoelastic crustal model with frequency-dependent shear velocity and attenuation.
University of Michigan -Traveler Contact Information Name __________________________________
Eustice, Ryan
University of Michigan - Traveler Contact Information Name __________________________________ Phone __________________________________ Email __________________________________ University of Michigan/Clinic __________________________________ Address __________________________________ Phone __________________________________ University of Michigan
Gravitational dispersion in a torsional wave machine
Rafael de la Madrid; Alejandro Gonzalez; George Irwin
2014-09-01T23:59:59.000Z
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.
Revised October 2013 DISSERTATION RESEARCH TRAVEL AWARD -
Ferrari, Silvia
Revised October 2013 DISSERTATION RESEARCH TRAVEL AWARD - INTERNATIONAL Application for Academic Year 2014-2015 These Graduate School Dissertation Research Travel Awards provide funding for Ph.D. students to travel outside the United States in order to conduct pre-dissertation or dissertation research
Revised October 2013 DISSERTATION RESEARCH TRAVEL AWARD -
Ferrari, Silvia
Revised October 2013 DISSERTATION RESEARCH TRAVEL AWARD - DOMESTIC Application for Academic Year 2014-2015 These Graduate School Dissertation Research Travel Awards provide funding for Ph.D. students to travel within the United States in order to conduct pre-dissertation or dissertation research. Award
Unimodal wave trains and solitons in convex FPU chains
Michael Herrmann
2009-01-23T23:59:59.000Z
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.
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
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.
Wave Propagation Theory 2.1 The Wave Equation
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
An investigation of induced travel at mixed-use developments
Sperry, Benjamin Robert
2009-05-15T23:59:59.000Z
information about two trips made by the respondent, including whether the trip made at the time of the interview was induced. A trip was considered induced if the respondent would not have made the trip if it had required travel outside of Legacy Town Center...
Yoo, Kyung Hyan
2011-08-08T23:59:59.000Z
To help online trip planners, some online travel agencies and travel service providers have adopted travel recommender systems. Although these systems are expected to support travelers in complex decision-making processes, ...
J X Zheng-Johansson; P-I Johansson
2006-08-27T23:59:59.000Z
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.
Numerical Exercises Course Applied Finite Elements 2012 Tsunami Wave Amplification
Al Hanbali, Ahmad
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
Linear water waves with vorticity: rotational features and particle paths
Mats Ehrnstrom; Gabriele Villari
2007-12-04T23:59:59.000Z
Steady linear gravity waves of small amplitude travelling on a current of constant vorticity are found. For negative vorticity we show the appearance of internal waves and vortices, wherein the particle trajectories are not any more closed ellipses. For positive vorticity the situation resembles that of Stokes waves, but for large vorticity the trajectories are affected.
Shock wave propagation in composites and active Vinamra Agrawal
Shyamasundar, R.K.
Shock wave propagation in composites and active Vinamra Agrawal California Institute of Technology Under the application of high strain rate loading, like impact of a projectile on a target, shock waves travel through a material. These waves are characterized as a discontinuity propagating through
Duputel, Zacharie
tractable on a common field computer, to constrain the 1D vertical profile of shear velocities, and static seismic corrections in shear-wave profiling e.g., Mari, 1984 . MASW is based on a frequency multimode dispersion data. Several methods have been de- veloped to isolate the different modes from seismic
Geometrical vs wave optics under gravitational waves
Raymond Angélil; Prasenjit Saha
2015-05-20T23:59:59.000Z
We present some new derivations of the effect of a plane gravitational wave on a light ray. A simple interpretation of the results is that a gravitational wave causes a phase modulation of electromagnetic waves. We arrive at this picture from two contrasting directions, namely null geodesics and Maxwell's equations, or, geometric and wave optics. Under geometric optics, we express the geodesic equations in Hamiltonian form and solve perturbatively for the effect of gravitational waves. We find that the well-known time-delay formula for light generalizes trivially to massive particles. We also recover, by way of a Hamilton-Jacobi equation, the phase modulation obtained under wave optics. Turning then to wave optics - rather than solving Maxwell's equations directly for the fields, as in most previous approaches - we derive a perturbed wave equation (perturbed by the gravitational wave) for the electromagnetic four-potential. From this wave equation it follows that the four-potential and the electric and magnetic fields all experience the same phase modulation. Applying such a phase modulation to a superposition of plane waves corresponding to a Gaussian wave packet leads to time delays.
Simulation of anisotropic wave propagation in Vertical Seismic Profiles
Durussel, Vincent Bernard
2004-09-30T23:59:59.000Z
of the subsurface. This is especially true in wide-aperture Vertical Seismic Profiles where waves travel both vertically and horizontally. Anisotropy has been neglected in wavefront construction methods of seismic ray-tracing until Gibson (2000), who showed...
SRI2007 Conference - Travel Tips
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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), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million CubicRefiners SwitchBenefitsBeam Line Support | Floor Support |18351 Effects HomeTravel
Traveling-Wave Thermoacoustic Engines With Internal Combustion
Weiland, Nathan Thomas (Blacksburg, VA); Zinn, Ben T. (Atlanta, GA); Swift, Gregory William (Sante Fe, NM)
2004-05-11T23:59:59.000Z
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.
Traveling Waves with Paraboloid Like Interfaces for Balanced Bistable Dynamics
Hamel, FranÃ§ois
University 88, S-4, Ting Chou Road, Taipei 116, Taiwan c UniversitÂ´e Aix-Marseille III, LATP (UMR CNRS 6632 e Laboratoire M.I.P. (UMR CNRS 5640) and Institut Universitaire de France UniversitÂ´e Paul Sabatier
Preventing transition to turbulence using streamwise traveling waves: theoretical analysis
Jovanovic, Mihailo
. INTRODUCTION Fluid motion is usually classified as either laminar or turbulent; flows that are smooth force on a vehicle moving through a fluid in the laminar regime. Sensorless flow control represents and ordered (laminar) may become complex and disordered (turbulent) as the flow strength increases
An investigation of the information needs of air passengers traveling to the airport
Burdette, Debra Arlene
2000-01-01T23:59:59.000Z
with the existing types of real-time travel information that are available. Specifically, the survey results showed that passengers currently use and would prefer to have access to flight information including, confirmed schedules, flight delays, and gate...
Dissipative electromagnetic solitary waves in collisional plasmas
Borhanian, Jafar [Department of Physics, Faculty of Science, University of Mohaghegh Ardabili, P.O.Box 179, Ardabil (Iran, Islamic Republic of)
2012-08-15T23:59:59.000Z
The propagation of linearly polarized electromagnetic (EM) waves in a collisional plasma is studied using multiple scale perturbation technique in a weakly nonlinear regime. A complex linear dispersion relation and a complex group velocity are obtained for EM waves propagating in a plasma and their dependence on system parameters is investigated. It is shown that the amplitude of EM pulse is governed by an envelope equation similar to a cubic complex Ginzburg-Landau equation. A traveling bright solitary wave solution for envelope equation is found, its existence condition in parameter space is explored and variation of its profile with system parameters is manipulated. Monitoring temporal evolution of traveling solitary wave solution provides more insight into the nature of this solution and ensures that depending on the parameters of the system, solitary wave solution may behave like a stationary soliton or may exhibit the behavior of a breathing soliton.
Time machines and quantum theory
Mark J Hadley
2006-12-02T23:59:59.000Z
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.
A Theory of Travel Decision-Making with Applications for Modeling Active Travel Demand
Bertini, Robert L.
A Theory of Travel Decision-Making with Applications for Modeling Active Travel Demand by Patrick methods, the research upon which modeling tools are based has yet to settle on a comprehensive theory, and environmental factors. While modeling tools have explained travel primarily through economic theories
Journey to the edge of time: The GREAT mission
Neil J. Cornish; David N. Spergel; Charles L. Bennett
2002-01-31T23:59:59.000Z
We are surrounded by radiation that originated from the big bang. It has traveled to us from the farthest reaches of the Universe, carrying with it an unaltered record of the beginning of time and space. The radiation is in the form of gravitational waves - propagating ripples in the curvature of spacetime. We describe a mission to detect these Gravitational Echos Across Time (GREAT) that would open up a new window on the very early universe. By studying the gravitational echoes of the big bang we will gain insight into the fundamental structure of matter, gravity, and how the Universe formed.
Korneev, Valeri A. (Lafayette, CA); Bakulin, Andrey (Houston, TX)
2009-10-13T23:59:59.000Z
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
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.
Time Commitments Where Does Your Time Go
Kunkle, Tom
Time Commitments Where Does Your Time Go Everyone starts the week with the same number of hours. So, why does your time go so fast? Let's find out! Number of hours of sleep each night ____ x 7 preparation/clean-up time) ____ x 7 = ____ Travel time to and from campus ___ x __ = ____ Number of hours per
UNIVERSITY OF WASHINGTON TRAVEL CARD APPLICATION
Matrajt, Graciela
UNIVERSITY OF WASHINGTON TRAVEL CARD APPLICATION US 01745 UW CTS Box 351120 206-543-7171 CARD DATA the following conditions: · The card must be used only for University of Washington business related and travel expenses as described in card policies http://f2.washington.edu/fm
Travel policies and practices of Department of Energy grantees. [Travel costs for US DOE grantees
Not Available
1981-09-30T23:59:59.000Z
The fiscal year 1980 travel activities, particularly trips to annual conventions, of Department of Energy grantees were reviewed. DOE made 9987 grants during fiscal year 1980. Ten grantees, i.e., educational institutions, governmental entities, companies, etc. were selected for the travel review. Information is included on the cost and purpose of trips, applicable travel policies, cost reporting, and auditing of travel vouchers. The results showed that the 10 selected grantees made 1194 trips costing a total of $170,974, or about 1% of their grant funds. Grantees travel costs ranged from $331 to $46,512 and the number of trips ranged from 1 to 471. (LCL)
Positioner with long travel in two dimensions
Trumper, David L. (Plaistow, NH); Williams, Mark E. (Pelham, NH)
1997-12-23T23:59:59.000Z
A precision positioning system is provided which provides long travel in two of the linear dimensions, while using non-contact bearings for both a first subassembly which provides long travel in one of the linear dimension and a second subassembly which provides long travel in the second linear dimension. The first or upper subassembly is preferably a magnetic subassembly which, in addition to providing long travel, also compensates or positions in three rotary dimensions and in the third linear dimension. The second subassembly is preferably either an air bearing or magnetic subassembly and is normally used only to provide long travel. Angled surfaces may be provided for magnetic bearings and capacitive or other gap sensing probes may be mounted to the stage and ground flush with the bearing actuators to provide more precise gap measurements.
CUNY EXPORT CONTROL TRAVEL BRIEFING Last Updated: May 6, 2013
Rosen, Jay
CUNY EXPORT CONTROL TRAVEL BRIEFING Last Updated: May 6, 2013 1 CUNY EXPORT CONTROL GUIDANCE: INTERNATIONAL TRAVEL BRIEFING 1. Introduction When traveling abroad, taking certain items, providing certain services or meeting with certain people can present export control
Rebound 2007: Analysis of U.S. Light-Duty Vehicle Travel Statistics
Greene, David L [ORNL
2010-01-01T23:59:59.000Z
U.S. national time series data on vehicle travel by passenger cars and light trucks covering the period 1966 2007 are used to test for the existence, size and stability of the rebound effect for motor vehicle fuel efficiency on vehicle travel. The data show a statistically significant effect of gasoline price on vehicle travel but do not support the existence of a direct impact of fuel efficiency on vehicle travel. Additional tests indicate that fuel price effects have not been constant over time, although the hypothesis of symmetry with respect to price increases and decreases is not rejected. Small and Van Dender (2007) model of a declining rebound effect with income is tested and similar results are obtained.
Congedo, Giuseppe
2015-01-01T23:59:59.000Z
The measurement of frequency shifts for light beams exchanged between two test masses nearly in free fall is at the heart of gravitational wave detection. It is envisaged that the derivative of the frequency shift is in fact limited by differential forces acting on those test masses. We calculate the derivative of the frequency shift with a fully covariant, gauge-independent and coordinate-free method. This method is general and does not require a congruence of nearby beams' null geodesics as done in previous work. We show that the derivative of the parallel transport is the only means by which gravitational effects shows up in the frequency shift. This contribution is given as an integral of the Riemann tensor --the only physical observable of curvature-- along the beam's geodesic. The remaining contributions are: the difference of velocities, the difference of non-gravitational forces, and finally fictitious forces, either locally at the test masses or non-locally integrated along the beam's geodesic. As an...
ORISE: CDC Travelers' Health Mobile App, Designed by ORISE, Gains...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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 Making a...
Secretary Bodman To Travel to Vienna, Austria for Second GNEP...
Bodman To Travel to Vienna, Austria for Second GNEP Ministerial and IAEA General Conference Secretary Bodman To Travel to Vienna, Austria for Second GNEP Ministerial and IAEA...
Energy Secretary Bodman Travels to Moscow, Baku, Kiev to Discuss...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Travels to Moscow, Baku, Kiev to Discuss Energy and Nuclear Security Energy Secretary Bodman Travels to Moscow, Baku, Kiev to Discuss Energy and Nuclear Security May 20, 2005 -...
Secretary Bodman Travels to Russia to Advance Energy Security...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Secretary Bodman Travels to Russia to Advance Energy Security Secretary Bodman Travels to Russia to Advance Energy Security March 15, 2006 - 12:20pm Addthis Promotes Transparent...
Bertini, Robert L.
- ommends the use of 90th and 95th percentile travel times for a given route or trip as the simplest indicator of travel time reliability (2). The 90th and 95th percentile travel times are intended to reflectth, 80th, and 95th percentile travel time to represent variability in rural and urban areas
WebNow login Instructions for Mac Users Accounts Payable & Travel Page 1 of 14
Yamamoto, Keith
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
Changing forms and sudden smooth transitions of tsunami waves
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 can be as large as two, which may explain anomalous elevations of tsunamis at particular positions
2003-01-01T23:59:59.000Z
ratio and saturation power traveling-wave electroabsorptionpower penalty 80 t o 10 Gbit/s OTDM demultiplexer using standing-wavepower penalty 80 to l O G b i l / s demultiplexing using a novel standing-wave
Information-Entropic for Travelling Solitons in Lorentz and CPT Breaking Systems
R. A. C. Correa; Roldao da Rocha; A. de Souza Dutra
2015-02-08T23:59:59.000Z
In this work we group three research topics apparently disconnected, namely solitons, Lorentz symmetry breaking and entropy. Following a recent work [Phys. Lett. B 713 (2012) 304], we show that it is possible to construct in the context of travelling wave solutions a configurational entropy measure in functional space, from the field configurations. Thus, we investigate the existence and properties of travelling solitons in Lorentz and CPT breaking scenarios for a class of models with two interacting scalar fields. Here, we obtain a complete set of exact solutions for the model studied which display both double and single-kink configurations. In fact, such models are very important in applications that include Bloch branes, Skyrmions, Yang-Mills, Q-balls, oscillons and various superstring-motivated theories. We find that the so-called Configurational Entropy (CE) for travelling solitons, which we name as travelling Configurational Entropy (TCE), shows that the best value of parameter responsible to break the Lorentz symmetry is one where the energy density is distributed equally around the origin. In this way, the information-theoretical measure of travelling solitons in Lorentz symmetry violation scenarios opens a new window to probe situations where the parameters responsible for breaking the symmetries are random. In this case, the TCE selects the best value.
University of Connecticut Office of Travel Services,
Alpay, S. Pamir
University of Connecticut Office of Travel Services, Accounts Payable Department New Central Warehouse Building, 3 North Hillside Road, Unit 6220 Storrs, CT 06269-6220 The University of Connecticut
The Patricia Mokhtarian Fund for Travel Behavior
California at Davis, University of
and friends are coming together to create The Patricia Mokhtarian Fund for Travel Behavior at UC Davis Bhat, Cynthia Chen, Sangho Choo, Michael Clay, Susan Handy, David Ory, Ram Pendyala, and Gil Tal. Thank
The domestic travel sector in China
Anders, Jeff, M.B.A. Massachusetts Institute of Technology
2007-01-01T23:59:59.000Z
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, ...
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...
INTERNATIONAL TRAVEL REIMBURSEMENT REQUEST Date: Dept: Preparer
El Karoui, Noureddine
INTERNATIONAL TRAVEL REIMBURSEMENT REQUEST Date: Dept: Preparer: UC Employee Student Vendor Other: Name: Emp/Stu/Ven ID: Address: City/ST/Zip: E-Mail: Phone: US Citizen/Permanent Resident? Yes No Fax
Wave-wave interactions in solar 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
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.
Transformative Wave Technologies Kent, Washington
California at Davis, University of
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
Ghezzehei, T.A.
2008-05-29T23:59:59.000Z
Application of time domain reflectometry (TDR) in soil hydrology often involves the conversion of TDR-measured dielectric permittivity to water content using universal calibration equations (empirical or physically based). Deviations of soil-specific calibrations from the universal calibrations have been noted and are usually attributed to peculiar composition of soil constituents, such as high content of clay and/or organic matter. Although it is recognized that soil disturbance by TDR waveguides may have impact on measurement errors, to our knowledge, there has not been any quantification of this effect. In this paper, we introduce a method that estimates this error by combining two models: one that describes soil compaction around cylindrical objects and another that translates change in bulk density to evolution of soil water retention characteristics. Our analysis indicates that the compaction pattern depends on the mechanical properties of the soil at the time of installation. The relative error in water content measurement depends on the compaction pattern as well as the water content and water retention properties of the soil. Illustrative calculations based on measured soil mechanical and hydrologic properties from the literature indicate that the measurement errors of using a standard three-prong TDR waveguide could be up to 10%. We also show that the error scales linearly with the ratio of rod radius to the interradius spacing.
Masaru Ikehata
2013-10-30T23:59:59.000Z
This paper considers an inverse problem for the classical wave equation in an exterior domain. It is a mathematical interpretation of an inverse obstacle problem which employs the dynamical scattering data of acoustic wave over a finite time interval. It is assumed that the wave satisfies a Robin type boundary condition with an unknown variable coefficient. The wave is generated by the initial data localized outside the obstacle and observed over a finite time interval at the same place as the support of the initial data. It is already known that, using the enclosure method, one can extract the maximum sphere whose exterior encloses the obstacle, from the data. In this paper, it is shown that the enclosure method enables us to extract also: (i) a quantity which indicates the deviation of the geometry between the maximum sphere and the boundary of the obstacle at the first reflection points of the wave; (ii) the value of the coefficient of the boundary condition at an arbitrary first reflection point of the wave provided, for example, the surface of the obstacle is known in a neighbourhood of the point. Another new obtained knowledge is that: the enclosure method can cover the case when the data are taken over a sphere whose centre coincides with that of the support of an initial data and yields corresponding results to (i) and (ii).
Physics 5B Winter 2009 Rate of Energy Transfer by Sinusoidal Waves on a String
California at Santa Cruz, University of
, 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
Freij, N.; Nelson, C. J.; Mumford, S.; Erdélyi, R. [Solar Physics and Space Plasma Research Centre (SP2RC), School of Mathematics and Statistics, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH (United Kingdom); Scullion, E. M.; Wedemeyer, S., E-mail: n.freij@sheffield.ac.uk [Institute of Theoretical Astrophysics, University of Oslo, Postboks 1029 Blindern, NO-0315 Oslo (Norway)
2014-08-10T23:59:59.000Z
There have been ubiquitous observations of wave-like motions in the solar atmosphere for decades. Recent improvements to space- and ground-based observatories have allowed the focus to shift to smaller magnetic structures on the solar surface. In this paper, high-resolution ground-based data taken using the Swedish 1 m Solar Telescope is combined with co-spatial and co-temporal data from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) satellite to analyze running penumbral waves (RPWs). RPWs have always been thought to be radial wave propagation that occurs within sunspots. Recent research has suggested that they are in fact upwardly propagating field-aligned waves (UPWs). Here, RPWs within a solar pore are observed for the first time and are interpreted as UPWs due to the lack of a penumbra that is required to support RPWs. These UPWs are also observed co-spatially and co-temporally within several SDO/AIA elemental lines that sample the transition region and low corona. The observed UPWs are traveling at a horizontal velocity of around 17 ± 0.5 km s{sup –1} and a minimum vertical velocity of 42 ± 21 km s{sup –1}. The estimated energy of the waves is around 150 W m{sup –2}, which is on the lower bound required to heat the quiet-Sun corona. This is a new, yet unconsidered source of wave energy within the solar chromosphere and low corona.
Chu, Yi-Zen
2015-01-01T23:59:59.000Z
This work was mainly driven by the desire to explore, to what extent embedding some given geometry in a higher dimensional flat one is useful for understanding the causal structure of classical fields traveling in the former, in terms of that in the latter. We point out, in the 4D spatially flat FLRW universe, that the causal structure of transverse-traceless (TT) gravitational waves can be elucidated by first reducing the problem to a 2D Minkowski wave equation with a time dependent potential, where the relevant Green's function is pure tail -- waves produced by a physical source propagate strictly within the null cone. By viewing this 2D world as embedded in a 4D one, the 2D Green's function can also be seen to be sourced by a cylindrically symmetric scalar field in 3D. From both the 2D wave equation as well as the 3D scalar perspective, we recover the exact solution of the 4D graviton tail, for the case where the scale factor written in conformal time is a power law. There are no TT gravitational wave tail...
Sych, Robert
2015-01-01T23:59:59.000Z
The review addresses the spatial frequency morphology of sources of sunspot oscillations and waves, including their localization, size, oscillation periods, height localization with the mechanism of cut-off frequency that forms the observed emission variability. Dynamic of sunspot wave processes, provides the information about the structure of wave fronts and their time variations, investigates the oscillation frequency transformation depending on the wave energy is shown. The initializing solar flares caused by trigger agents like magnetoacoustic waves, accelerated particle beams, and shocks are discussed. Special attention is paid to the relation between the flare reconnection periodic initialization and the dynamics of sunspot slow magnetoacoustic waves. A short review of theoretical models of sunspot oscillations is provided.
Cycloidal Wave Energy Converter
Stefan G. Siegel, Ph.D.
2012-11-30T23:59:59.000Z
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.
Marsh, S.P.
1988-03-08T23:59:59.000Z
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.
1987-03-12T23:59:59.000Z
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.
The Time Dependent Traveling Salesman Problem: Polyhedra and ...
2010-12-30T23:59:59.000Z
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.
EXPOSITOR: Scriptable Time-Travel Debugging with First Class Traces
Hicks, Michael
style which, as pointed out by Marceau et al. [2], reduces composability and reusabil- ity, and complicates checking temporal properties. Marceau et al. propose treating the program as an event generator
Supplemental Guidance Regarding Compensatory Time Off for Travel |
Broader source: Energy.gov (indexed) [DOE]
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), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362Transmission:portion5WhenEnergy 3 for theof EnergyofDecember 3, 2001April
Ring aggregation pattern of Human Travel Trips
Wang, Zi-Yang; Zhu, Peng; Qin, Yong; Jia, Li-Min
2015-01-01T23:59:59.000Z
Although a lot of attentions have been paid to human mobility, the relationship between travel pattern with city structure is still unclear. Here we probe into this relationship by analyzing the metro passenger trip data.There are two unprecedented findings. One, from the average view a linear law exists between the individual's travel distance with his original distance to city center. The mechanism underlying is a travel pattern we called "ring aggregation", i.e., the daily movement of city passengers is just aggregating to a ring with roughly equal distance to city center.Interestingly, for the round trips the daily travel pattern can be regarded as a switching between the home ring at outer area with the office ring at the inner area. Second, this linear law and ring aggregation pattern seems to be an exclusive characteristic of the metro system. It can not be found in short distance transportation modes, such as bicycle and taxi, neither as multiple transportation modes. This means the ring aggregation p...
CUNY EXPORT CONTROL PROCEDURES 16. Travel Abroad
Rosen, Jay
CUNY EXPORT CONTROL PROCEDURES 16. Travel Abroad This Section addresses the process for ensuring export control compliance when shipping or carrying tangible items associated with conferences with whether these activities are subject to export control regulations, to the extent that the scope
FACULTY CONFERENCE TRAVEL GRANT APPLICATION FORM
Northern British Columbia, University of
FACULTY CONFERENCE TRAVEL GRANT APPLICATION FORM The University of Northern British Columbia conferences. GUIDELINES 1. There will be two (2) competitions per year: March 15 and September 15. 2 consideration; however, the applicant must apply prior to attending the conference and an explanation
Estimating Vehicle Miles Traveled on Local Roads
Qian, Jiayu
2013-11-07T23:59:59.000Z
This research presents a new method to estimate the local road vehicle miles traveled (VMT) with the concept of betweenness centrality. Betweenness centrality is a measure of a node’s or link’s centrality on a network that has been applied popularly...
Travel Expands Collecting in the Middle East
of a library system integrating cataloging, acquisitions, and circu- lation functions. Many conversations specialized and automated library, produced a similar result. Traveling to the city of Qom in the south on to Lebanon, I established a gift and exchange program with the Associate Librarian at the American University
Donald L. Wood Professional Conference Travel Grants
Cantlon, Jessica F.
Donald L. Wood Professional Conference Travel Grants for Engineering Undergraduates APPLICATION by a generous donation from the estate of Donald L. Wood. The student application and final report will be used to describe our accomplishments to the family of this sponsor. #12;Donald L. Wood Professional Conference
Yi-Zen Chu
2015-05-05T23:59:59.000Z
This work was mainly driven by the desire to explore, to what extent embedding some given geometry in a higher dimensional flat one is useful for understanding the causal structure of classical fields traveling in the former, in terms of that in the latter. We point out, in the 4D spatially flat FLRW universe, that the causal structure of transverse-traceless (TT) gravitational waves can be elucidated by first reducing the problem to a 2D Minkowski wave equation with a time dependent potential, where the relevant Green's function is pure tail -- waves produced by a physical source propagate strictly within the null cone. By viewing this 2D world as embedded in a 4D one, the 2D Green's function can also be seen to be sourced by a cylindrically symmetric scalar field in 3D. From both the 2D wave equation as well as the 3D scalar perspective, we recover the exact solution of the 4D graviton tail, for the case where the scale factor written in conformal time is a power law. There are no TT gravitational wave tails when the universe is radiation dominated because the background Ricci scalar is zero. In a matter dominated one, we estimate the amplitude of the tail to be suppressed relative to its null counterpart by both the ratio of the duration of the source to the age of the universe $\\eta_0$, and the ratio of the observer-source spatial distance (at the observer's time) to the same $\\eta_0$. In a universe driven primarily by a cosmological constant, the tail contribution to the background FLRW geometry after the source has ceased, is the conformal factor $a^2$ times a spacetime-constant symmetric matrix proportional to the spacetime volume integral of the TT part of the source's stress-energy-momentum tensor. In other words, massless spin-2 gravitational waves exhibit a memory effect in de Sitter spacetime.
Forecasting 65+ travel : an integration of cohort analysis and travel demand modeling
Bush, Sarah, 1973-
2003-01-01T23:59:59.000Z
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+ ...
A Coherence-Based Approach for Tracking Waves in the Solar Corona
Scott W. McIntosh; Bart De Pontieu; Steven Tomczyk
2008-08-21T23:59:59.000Z
We consider the problem of automatically (and robustly) isolating and extracting information about waves and oscillations observed in EUV image sequences of the solar corona with a view to near real-time application to data from the Atmospheric Imaging Array (AIA) on the Solar Dynamics Observatory (SDO). We find that a simple coherence / travel-time based approach detects and provides a wealth of information on transverse and longitudinal wave phenomena in the test sequences provided by the Transition Region and Coronal Explorer (TRACE). The results of the search are "pruned" (based on diagnostic errors) to minimize false-detections such that the remainder provides robust measurements of waves in the solar corona, with the calculated propagation speed allowing automated distinction between various wave modes. In this paper we discuss the technique, present results on the TRACE test sequences, and describe how our method can be used to automatically process the enormous flow of data (~1Tb/day) that will be provided by SDO/AIA after launch in late 2008.
Mechanical Surface Waves Accompany Action Potential Propagation
Ahmed El Hady; Benjamin B. Machta
2014-10-05T23:59:59.000Z
Many studies have shown that a mechanical displacement of the axonal membrane accompanies the electrical pulse defining the Action Potential (AP). Despite a large and diverse body of experimental evidence, there is no theoretical consensus either for the physical basis of this mechanical wave nor its interdependence with the electrical signal. In this manuscript we present a model for these mechanical displacements as arising from the driving of surface wave modes in which potential energy is stored in elastic properties of the neuronal membrane and cytoskeleton while kinetic energy is carried by the axoplasmic fluid. In our model these surface waves are driven by the traveling wave of electrical depolarization that characterizes the AP, altering the compressive electrostatic forces across the membrane as it passes. This driving leads to co-propagating mechanical displacements, which we term Action Waves (AWs). Our model for these AWs allows us to predict, in terms of elastic constants, axon radius and axoplasmic density and viscosity, the shape of the AW that should accompany any traveling wave of voltage, including the AP predicted by the Hodgkin and Huxley (HH) equations. We show that our model makes predictions that are in agreement with results in experimental systems including the garfish olfactory nerve and the squid giant axon. We expect our model to serve as a framework for understanding the physical origins and possible functional roles of these AWs in neurobiology.
Kockelman, Kara M.
the rental) like Car2Go and ZipCar have quickly expanded, with the number of U.S. users doubling every one traveler wait times. Next, the model is run over one-hundred days, with driverless vehicles ferrying. As of September 2013, Google had logged over 500,000 miles driven on public roadways using cars equipped with self
Not Available
1980-03-01T23:59:59.000Z
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.
Extension arm for mobile travelers suit case
Byington, Gerald A. (Knoxville, TN)
1999-01-01T23:59:59.000Z
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.
Deflection microwave and millimeter-wave amplifiers
Tang., C.M. [Naval Research Lab., Washington, DC (United States)] [Naval Research Lab., Washington, DC (United States); Lau, Y.Y. [Univ. of Michigan, Ann Arbor, MI (United States)] [Univ. of Michigan, Ann Arbor, MI (United States); Swyden, T.A. [FM Technologies, Inc., Fairfax, VA (United States)] [FM Technologies, Inc., Fairfax, VA (United States)
1994-03-01T23:59:59.000Z
A new class of microwave and millimeter-wave amplifiers, called deflectron amplifiers, which are based on the deflection of low voltage electron beams in a microstructure were analyzed. This concept may be applied in two ways: as microelectronic amplifiers or as bunched beam cathodes to power conventional amplifier configurations such as klystrodes and traveling wave tubes. Estimates for gain and efficiency are obtained from a circuit analysis. Particle codes are used to test the viability of the concept. Frequencies of operation are projected up to a few tens of GHz for microelectronic amplifiers and up to {approx}80 GHz for power amplifiers 29 refs., 5 figs.
Dr. John Slough "Rapid Manned Mars Mission with a Propagating Magnetic Wave
Shepherd, Simon
Dr. John Slough MSNW "Rapid Manned Mars Mission with a Propagating Magnetic Wave Plasma Accelerator" For man to venture forth into the solar system, a radically different propulsion system must be envisioned problem. This is accomplished by employing a travelling magnetic wave accelerator to accelerate
Multistage interaction of a shock wave and a strong vortex Shuhai Zhanga
Zhang, Yong-Tao
tube, it traveled back toward the vortex and the interaction between the shock and the vortex tookMultistage interaction of a shock wave and a strong vortex Shuhai Zhanga China Aerodynamics; published online 8 November 2005 The interaction between a shock wave and a strong vortex is simulated
Under consideration for publication in J. Fluid Mech. 1 Hydroelastic waves on fluid sheets
Parau, Emilian I.
). In particular our work may find application in flat plate-type fuel assemblies found in nuclear reactor coolingUnder consideration for publication in J. Fluid Mech. 1 Hydroelastic waves on fluid sheets M. G. B 6BT, UK (Received 26 March 2012) Nonlinear travelling waves on a two-dimensional inviscid fluid
Contents lists available at ScienceDirect. Wave Motion .... The mudstone layers are fully saturated with water and their properties are frequency independent.
WAVE HEIGHTS IN A 4D OCEAN WAVE FIELD Paul C. Liu
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
Paul S. Wesson
2012-12-11T23:59:59.000Z
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.
Making Travel Arrangements | 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), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville PowerTariff Pages default Sign InCenter3.82 4.23OMC-CS-532H Rev. 1 Published July 29,Making Travel
Venue and Travel | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
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), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 ofSubscribe to AcquisitionJenUpdated September 26, 2012. Memo from RobertVenue and Travel Hilton
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), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6Environmental1 | NationalFermilabFermilab'sGrowingTheTravel and Lodging
Calculation of Extreme Wave Loads on Coastal Highway Bridges
Meng, Bo
2010-01-14T23:59:59.000Z
force on bridge decks. 2D Model is a linear wave model, which has the capability of calculating wave velocity potential components in time domain based on wave parameters such as wave height, wave period and water depth, and complex structural geometries...
Business and Finance Purchasing Card, Travel Card and Group/Extended Travel Card
of card may accommodate multiple travelers ATM use permitted with authorization. May be used and with proper documentation, including college/vice presidential authorization, single transaction and monthly presidential area's internal control structure. Appropriate segregation of duties must be maintained. IV. Card
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.
Secretary Moniz Announces Travel to Chicago, North Dakota, New...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Chicago, North Dakota, New Mexico for Quadrennial Energy Review Secretary Moniz Announces Travel to Chicago, North Dakota, New Mexico for Quadrennial Energy Review August 5, 2014 -...
A Dynamic Traveling Salesman Problem with Stochastic Arc Costs
Alejandro Toriello
2012-08-31T23:59:59.000Z
Aug 31, 2012 ... Abstract: We propose a dynamic traveling salesman problem (TSP) with stochastic arc costs motivated by applications, such as dynamic ...
DOE Honors WIPP Representative for Cutting Travel Costs, Greenhouse...
Office of Environmental Management (EM)
and reduced rental car usage by standardizing travel arrangements so that only one rental car is necessary per trip. CCP is responsible for characterization and shipment of...
Secretary Chu and Energy Department Officials to Travel Across...
Office of Environmental Management (EM)
26, Secretary of Energy Steven Chu will travel to Albuquerque, N.M., to tour renewable energy research facilities at Sandia National Laboratories, which is working to advance...
Return to the Homeland: Travels in Nigeria by Ola Washington
Amankulor, J. Ndukaku
1989-01-01T23:59:59.000Z
of America during her visit to Nigeria. The imponant thingshowed that she went to Nigeria having a positive attitudethe Homeland; Travels in Nigeria - No Snakes, No Monkeys, No
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...
NO FLARES FROM GAMMA-RAY BURST AFTERGLOW BLAST WAVES ENCOUNTERING SUDDEN CIRCUMBURST DENSITY CHANGE
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
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.
Revision Date: 02.10.2009 MATERIAL & DISBURSEMENT SERVICES, TRAVEL SERVICES
Crews, Stephen
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
INTERNATIONAL ACADEMIC TRAVEL AND U.S. EXPORT
Li, X. Rong
INTERNATIONAL ACADEMIC TRAVEL AND U.S. EXPORT CONTROLS Updated on 5/15/2014 #12;What are Export Export Administration Regulations (EAR) technologies with "dual uses" but primarily commercial 1 2 3 is an "Export" #12;INTERNATIONAL TRAVEL U.S. export control laws are principally concerned with: · Whether
International Academic Travel and U.S. Export Controls INTRODUCTION
Li, X. Rong
TOPIC: International Academic Travel and U.S. Export Controls INTRODUCTION: Many principal, and to perform their actual field research. But the academic traveler's failure to comply with U.S. export, was recently convicted for conspiracy to violate the Arms Export Control Act (AECA), the parent statute
Business and Finance Travel Policy #2.11
impropriety and/or the appearance of impropriety. D. The college/ vice presidential area is responsible travel. Travelers are cautioned to validate what expenditures are permitted on specific sponsored by each college and vice presidential area and detailed in the unit's Delegation of Signature Authority
Wave represents displacement Wave represents pressure Source -Sound Waves
Colorado at Boulder, University of
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
Reflection and transmission of ocean wave spectra by a band of randomly distributed ice floes
Montiel, Fabien; Bennetts, Luke
2014-01-01T23:59:59.000Z
A new ocean wave/sea-ice interaction model is proposed that simulates how a directional wave spectrum evolves as it travels through an arbitrary finite array of circular ice floes, where wave/ice dynamics are entirely governed by wave scattering effects. The model is applied to characterise the wave reflection and transmission properties of a strip of ice floes, such as an ice edge band. A method is devised to extract the reflected and transmitted directional wave spectra produced by the array. The method builds upon an integral mapping from polar to Cartesian coordinates of the scattered wave components. Sensitivity tests are conducted for a row of floes randomly perturbed from a regular arrangement. Results for random arrays are generated using ensemble averaging. A realistic ice edge band is then reconstructed from field experiments data. Simulations show a good qualitative agreement with the data in terms of transmitted wave energy and directional spreading. In particular, it is observed that short waves ...
WebNow login Instructions for PC Users Accounts Payable & Travel Page 1 of 15
Yamamoto, Keith
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
Magnetohydrodynamic Shearing Waves
Bryan M. Johnson
2007-02-12T23:59:59.000Z
I consider the nonaxisymmetric linear theory of a rotating, isothermal magnetohydrodynamic (MHD) shear flow. The analysis is performed in the shearing box, a local model of a thin disk, using a decomposition in terms of shearing waves, i.e., plane waves in a frame comoving with the shear. These waves do not have a definite frequency as in a normal mode decomposition, and numerical integration of a coupled set of amplitude equations is required to characterize their time dependence. Their generic time dependence, however, is oscillatory with slowly-varying frequency and amplitude, and one can construct accurate analytical solutions by applying the Wentzel-Kramers-Brillouin method to the full set of amplitude equations. The solutions have the following properties: 1) Their accuracy increases with wavenumber, so that most perturbations that fit within the disk are well-approximated as modes with time-dependent frequencies and amplitudes. 2) They can be broadly classed as incompressive and compressive perturbations, the former including the nonaxisymmetric extension of magnetorotationally unstable modes, and the latter being the extension of fast and slow modes to a differentially-rotating medium. 3) Wave action is conserved, implying that their energy varies with frequency. 4) Their shear stress is proportional to the slope of their frequency, so that they transport angular momentum outward (inward) when their frequency increases (decreases). The complete set of solutions constitutes a comprehensive linear test suite for numerical MHD algorithms that incorporate a background shear flow. I conclude with a brief discussion of possible astrophysical applications.
A Nonlocal Formulation of Rotational Water Waves
Anthony C. L Ashton; A. S. Fokas
2011-07-29T23:59:59.000Z
The classical equations of irrotational water waves have recently been reformulated as a system of two equations, one of which is an explicit non-local equation for the wave height and for the velocity potential evaluated on the free surface. Here, in the two dimensional case, (a) we generalise the relevant formulation to the case of constant vorticity, as well as to the case where the free surface is described by a multi-valued function; (b) in the case of travelling waves we derive an upper bound for the free surface; (c) in the case of constant vorticity we construct a sequence of nearly Hamiltonian systems which provide an approximation in the asymptotic limit of certain physical small parameters. In particular, the explicit dependence of the vorticity on the coefficients of the KdV equation is clarified. Also, in the irrotational case we extend the formalism to n>2 dimensions and analyse rigorously the linear limit of these equations.
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
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.
J. H. Field
2005-03-02T23:59:59.000Z
Feynman's laws of quantum dynamics are concisely stated, discussed in comparison with other formulations of quantum mechanics and applied to selected problems in the physical optics of photons and massive particles as well as flavour oscillations. The classical wave theory of light is derived from these laws for the case in which temporal variation of path amplitudes may be neglected, whereas specific experiments, sensitive to the temporal properties of path amplitudes, are suggested. The reflection coefficient of light from the surface of a transparent medium is found to be markedly different to that predicted by the classical Fresnel formula. Except for neutrino oscillations, good agreement is otherwise found with previous calculations of spatially dependent quantum interference effects.
Development of Improved Traveler Survey Methods for High-Speed Intercity Passenger Rail Planning
Sperry, Benjamin
2012-07-16T23:59:59.000Z
such demand through traveler surveys; specifically, the use of different experimental designs for stated preference questions and the use of images to describe hypothetical travel alternatives in traveler surveys. In pursuit of this goal, an Internet...
A comparison of trip production rates developed from two types of travel survey diaries
Tyner, Fred Mack
1996-01-01T23:59:59.000Z
an activity diary. The second is the California Statewide Travel Survey, which was conducted using a travel diary. The travel diary reported higher trip rates than the activity diary, especially for driver trips. This difference is explained by differences...
Wechsler, Risa H.
.S. Department of Energy (DOE); therefore, all reimbursements for travel costs need adhere to the applicable SLAC they obtain approval for authorized SLAC business, including attending conferences. The intent of this policy personnel traveling on authorized SLAC business, including attending conferences, and follows the government
Acosta, Charles A.
by the International Education Center (IEC) of Northern Kentucky University to support the internationalization participation, creative activity, and outreach. Eligibility and Criteria IEC Faculty International Travel Awards are not eligible.) #12;Terms IEC Faculty International Travel Awards will typically range from $300 to $1
Fort, James A.; Pfund, David M.; Sheen, David M.; Pappas, Richard A.; Morgen, Gerald P.
2007-04-01T23:59:59.000Z
The MFDRC was formed in 1998 to advance the state-of-the-art in simulating multiphase turbulent flows by developing advanced computational models for gas-solid flows that are experimentally validated over a wide range of industrially relevant conditions. The goal was to transfer the resulting validated models to interested US commercial CFD software vendors, who would then propagate the models as part of new code versions to their customers in the US chemical industry. Since the lack of detailed data sets at industrially relevant conditions is the major roadblock to developing and validating multiphase turbulence models, a significant component of the work involved flow measurements on an industrial-scale riser contributed by Westinghouse, which was subsequently installed at SNL. Model comparisons were performed against these datasets by LANL. A parallel Office of Industrial Technology (OIT) project within the consortium made similar comparisons between riser measurements and models at NETL. Measured flow quantities of interest included volume fraction, velocity, and velocity-fluctuation profiles for both gas and solid phases at various locations in the riser. Some additional techniques were required for these measurements beyond what was currently available. PNNL’s role on the project was to work with the SNL experimental team to develop and test two new measurement techniques, acoustic tomography and millimeter-wave velocimetry. Acoustic tomography is a promising technique for gas-solid flow measurements in risers and PNNL has substantial related experience in this area. PNNL is also active in developing millimeter wave imaging techniques, and this technology presents an additional approach to make desired measurements. PNNL supported the advanced diagnostics development part of this project by evaluating these techniques and then by adapting and developing the selected technology to bulk gas-solids flows and by implementing them for testing in the SNL riser testbed.
Wave Propagation in Multiferroic Materials
Keller, Scott Macklin
2013-01-01T23:59:59.000Z
130 SAW Waves . . . . . . . . . . . . . .QuasiStatic MEE Waves . . . . . . . . . . . . . . . . . . .General MEE Wave Solution . . . . . . . . . . . .
Epstein, Irving R.
- traveling waves. Introduction Pattern formation in reaction-diffusion systems has been a subject of intensive study for the past 40 years.1-6 However, the particular mode of pattern formation that results a study of pattern formation beyond the onset of the wave instability in a short model reaction- diffusion
Emergence of exponentially small reflected waves
Volker Betz; Alain Joye; Stefan Teufel
2008-04-23T23:59:59.000Z
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.
Matter Wave Radiation Leading to Matter Teleportation
Yong-Yi Huang
2015-02-12T23:59:59.000Z
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.
Electromagnetic wave scattering by Schwarzschild black holes
Luís C. B. Crispino; Sam R. Dolan; Ednilton S. Oliveira
2009-05-20T23:59:59.000Z
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.
Weiss, Jonathan D. (Albuquerque, NM)
1995-01-01T23:59:59.000Z
A shock velocity and damage location sensor providing a means of measuring shock speed and damage location. The sensor consists of a long series of time-of-arrival "points" constructed with fiber optics. The fiber optic sensor apparatus measures shock velocity as the fiber sensor is progressively crushed as a shock wave proceeds in a direction along the fiber. The light received by a receiving means changes as time-of-arrival points are destroyed as the sensor is disturbed by the shock. The sensor may comprise a transmitting fiber bent into a series of loops and fused to a receiving fiber at various places, time-of-arrival points, along the receiving fibers length. At the "points" of contact, where a portion of the light leaves the transmitting fiber and enters the receiving fiber, the loops would be required to allow the light to travel backwards through the receiving fiber toward a receiving means. The sensor may also comprise a single optical fiber wherein the time-of-arrival points are comprised of reflection planes distributed along the fibers length. In this configuration, as the shock front proceeds along the fiber it destroys one reflector after another. The output received by a receiving means from this sensor may be a series of downward steps produced as the shock wave destroys one time-of-arrival point after another, or a nonsequential pattern of steps in the event time-of-arrival points are destroyed at any point along the sensor.
Weiss, J.D.
1995-08-29T23:59:59.000Z
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.
Brauchler, R.; Doetsch, J.; Dietrich, P.; Sauter, M.
2012-01-10T23:59:59.000Z
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.
Administrative Directive For: Travel and Related Expenses Rates, Suppliers and Services
Michelson, David G.
1 Administrative Directive For: Travel and Related Expenses Rates, Suppliers and Services under Options - University travellers have the following alternate options for rental vehicle collision
Mokhtarian, Patricia; Handy, Susan; Salomon, Ilan
1995-01-01T23:59:59.000Z
have analyzed the air quality and energy impacts, but mostits travel, air quality, and energy impacts, and illustrateTHE TRAVEL, ENERGY, AND AIR QUALITY IMPACTS OF TELECOMMUTING
Shallow Water Waves and Solitary Waves
Hereman, Willy
2013-01-01T23:59:59.000Z
Encyclopedic article covering shallow water wave models used in oceanography and atmospheric science. Sections: Definition of the Subject; Introduction and Historical Perspective; Completely Integrable Shallow Water Wave Equations; Shallow Water Wave Equations of Geophysical Fluid Dynamics; Computation of Solitary Wave Solutions; Numerical Methods; Water Wave Experiments and Observations; Future Directions, and Bibliography.
Bertini, Robert L.
Information on Dynamic Message Signs Priya Chavan Department of Computer Science Portland State University Dynamic Message Signs (DMS) on freeways are often used to provide a variety of information to motorists such as Amber Alerts. The display of accurate travel time messages is currently of high importance
On-Line Travel Reservations through "Concur 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), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million Cubic Feet) NaturalOctober October 2015unsteadyFeet)On Correction ofJuneOn-Line Travel
ORISE: CDC Travelers' Health Team Receives Innovation Award for...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
CDC Travelers' Health Team Receives Innovation Award for Website Redesign ORISE serves as lead redesign contractor on award-winning website redesign for the CDC How ORISE is Making...
Odometer Versus Self-Reported Estimates of Vehicle Miles Traveled
Reports and Publications (EIA)
2000-01-01T23:59:59.000Z
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.
Developing an alternative model for travel decision-making
Hung, Kam
2009-05-15T23:59:59.000Z
)....................................................................................................................147 35 Estimation of fit indices of self-congruity measurement models ..............................148 36 Estimation of fit indices of travel intention model ....................................................149 37 Estimation of fit indices... Intentions...................................................................................................35 5 Self-congruity and Functional Congruity ....................................................................36 6 Destination...
Impact of videoconferencing on the demand for air travel
Mette, Matthias
1995-01-01T23:59:59.000Z
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 ...
Developing an alternative model for travel decision-making
Hung, Kam
2009-05-15T23:59:59.000Z
This study proposes an alternative travel decision making model and situates its arguments in the Motivation-Opportunity-Ability (MOA) theoretical construct. The MOA model suggests that motivation, opportunity, and ability are major factors...
U.S. Department of Energy Travel Manual
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2002-09-04T23:59:59.000Z
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.
U.S. Department of Energy Travel Manual
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2006-02-17T23:59:59.000Z
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.
Defining business strategy for development of travel and tourism industry
Davari, Dordaneh
2011-01-01T23:59:59.000Z
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 ...
Ocean 420 Physical Processes in the Ocean Project 6: Waves
Thompson, LuAnne
generates an upwelling internal wave at 30N with a positive deviation in interface height of size 30m. What long would it take for this internal wave to propagate to 40N? c) At the same time that the wave passesOcean 420 Physical Processes in the Ocean Project 6: Waves Due: Thursday, March 1 1. A two layer
The Nature of Running Penumbral Waves Revealed
D. Shaun Bloomfield; Andreas Lagg; Sami K. Solanki
2007-09-24T23:59:59.000Z
We seek to clarify the nature of running penumbral (RP) waves: are they chromospheric trans-sunspot waves or a visual pattern of upward-propagating waves? Full Stokes spectropolarimetric time series of the photospheric Si I 10827 \\AA line and the chromospheric He I 10830 \\AA multiplet were inverted using a Milne-Eddington atmosphere. Spatial pixels were paired between the outer umbral/inner penumbral photosphere and the penumbral chromosphere using inclinations retrieved by the inversion and the dual-height pairings of line-of-sight velocity time series were studied for signatures of wave propagation using a Fourier phase difference analysis. The dispersion relation for radiatively cooling acoustic waves, modified to incorporate an inclined propagation direction, fits well the observed phase differences between the pairs of photospheric and chromospheric pixels. We have thus demonstrated that RP waves are in effect low-beta slow-mode waves propagating along the magnetic field.
Fractional Electromagnetic Waves
J. F. Gómez; J. J. Rosales; J. J. Bernal; V. I. Tkach; M. Guía
2011-08-31T23:59:59.000Z
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.
Time cartogram series to explore differences in the level of railway services: a case, population or travelling-time. A time cartogram is a type of cartogram in which the geographic-distance between locations is replaced by a time-related attribute (e.g., travelling-time) and the geography
Ziurys, Lucy M.
at http://ua-risk.terradotta.com/ and the US State Department's Smart Traveler Enrollment Program (STEP conditions; different standards of design, safety, and maintenance of buildings, public places
Yoo, Kyung Hyan
2011-08-08T23:59:59.000Z
their human users. Thus, it is argued that enhancing the social aspects of travel recommender systems is important to create more persuasive systems. One approach to enhancing the social presence of recommender systems is to use a virtual agent. Current...
Menikoff, Ralph [Los Alamos National Laboratory
2012-04-03T23:59:59.000Z
Shock initiation in a plastic-bonded explosives (PBX) is due to hot spots. Current reactive burn models are based, at least heuristically, on the ignition and growth concept. The ignition phase occurs when a small localized region of high temperature (or hot spot) burns on a fast time scale. This is followed by a growth phase in which a reactive front spreads out from the hot spot. Propagating reactive fronts are deflagration waves. A key question is the deflagration speed in a PBX compressed and heated by a shock wave that generated the hot spot. Here, the ODEs for a steady deflagration wave profile in a compressible fluid are derived, along with the needed thermodynamic quantities of realistic equations of state corresponding to the reactants and products of a PBX. The properties of the wave profile equations are analyzed and an algorithm is derived for computing the deflagration speed. As an illustrative example, the algorithm is applied to compute the deflagration speed in shock compressed PBX 9501 as a function of shock pressure. The calculated deflagration speed, even at the CJ pressure, is low compared to the detonation speed. The implication of this are briefly discussed.
Thermal Gravitational Waves from Primordial Black Holes
C. Sivaram; Kenath Arun
2010-05-19T23:59:59.000Z
Thermal gravitational waves can be generated in various sources such as, in the cores of stars, white dwarfs and neutron stars due to the fermion collisions in the dense degenerate Fermi gas. Such high frequency thermal gravitational waves can also be produced during the collisions in a gamma ray burst or during the final stages of the evaporation of primordial black holes. Here we estimate the thermal gravitational waves from primordial black holes and estimate the integrated energy of the gravitational wave emission over the entire volume of the universe and over Hubble time. We also estimate the gravitational wave flux from gamma ray bursts and jets.
Method and apparatus for actively controlling a micro-scale flexural plate wave device
Dohner, Jeffrey L. (Albuquerque, NM)
2001-01-01T23:59:59.000Z
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.
Broader source: Energy.gov [DOE]
Numerous transportation strategies are directed at reducing energy use and greenhouse gas (GHG) emissions by changing the behavior of individual drivers or travelers. These behavioral changes may have the effect of reducing travel, shifting travel to more efficient modes, or improving the efficiency of existing travel. Since the 1970s, federal, regional, state and municipal agencies have tried to reduce energy use, emissions, and congestion by influencing travel behavior. This report reviews and summarizes the literature on relationships between these strategies and transportation-related energy use and GHG emissions to examine how changes to travel behavior can reduce transportation energy use and discuss the potential for federal actions to affect travel behavior.
Coda wave interferometry 1 Coda wave interferometry
Snieder, Roel
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
Center for Wave Phenomena Wave Phenomena
CWP Center for Wave Phenomena Center for Wave Phenomena Dave Hale CWP Director dhale in pursu- ing a focused and high- quality program in geo- physics." "The Center for Wave Phenomena for Wave Phenomena (CWP) at the Colorado School of Mines supports a graduate- level interdisciplinary
Shear wave transducer for boreholes
Mao, N.H.
1984-08-23T23:59:59.000Z
A technique and apparatus is provided for estimating in situ stresses by measuring stress-induced velocity anisotropy around a borehole. Two sets each of radially and tangentially polarized transducers are placed inside the hole with displacement directions either parallel or perpendicular to the principal stress directions. With this configuration, relative travel times are measured by both a pulsed phase-locked loop technique and a cross correlation of digitized waveforms. The biaxial velocity data are used to back-calculate the applied stress.
Indiana University
College of Arts and Sciences Travel Award Application Please submit the following information to request a College of Arts and Sciences Travel Award. Programs may nominate up to three students the College Graduate Office website for additional information: http
Indiana University
College of Arts and Sciences Travel Award Application Please submit the following information to request a College of Arts and Sciences Travel Award. Departments may nominate up to three students the College Graduate Office website for additional information: http
D. A. Simakov
2015-04-28T23:59:59.000Z
In this article we study a particular method of detection of chirp signals from coalescing compact binary stars -- the so-called dynamical tuning, i.e. amplification of the signal via tracking of its instantaneous frequency by the tuning of the signal-recycled detector. A time-domain consideration developed for signal-recycled interferometers, in particular GEO 600, describes the signal and noise evolution in the non-stationary detector. Its non-stationarity is caused by motion of the signal recycling mirror, whose position defines the tuning of the detector. We prove that the shot noise from the dark port and optical losses remains white. The analysis of the transient effects shows that during the perfect tracking of the chirp frequency only transients from amplitude changes arise. The signal-to-noise-ratio gain, calculated in this paper, is ~ 16 for a shot-noise limited detector and ~ 4 for a detector with thermal noise.
Final Report Phase I Study to Characterize the Market Potential for Non-Motorized Travel
Hwang, Ho-Ling [ORNL; Reuscher, Tim [Macrosys; Wilson, Daniel W [ORNL; Schmoyer, Richard L [ORNL
2012-06-01T23:59:59.000Z
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.
Neri, Peter
. The development of a sustainable travel plan is a significant element in the fulfilment of our commitment to the University, and between University sites. reduce the environmental impact of travel associatedUniversity Of Aberdeen Sustainable Travel Plan 2013_2017 V1 0.Docx Page 1 of 18 University
Modelling and geometry optimisation of wave energy converters
Nørvåg, Kjetil
Modelling and geometry optimisation of wave energy converters Adi Kurniawan Supervisors: Prof;Research questions Modelling How to develop more realistic wave energy converter (WEC) models while wave energy converter (WEC) models while at the same time reduce their simulation time? Optimisation
Spatiotemporal measurement of surfactant distribution on gravity-capillary waves
Strickland, Stephen L; Daniels, Karen E
2015-01-01T23:59:59.000Z
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...
Potma, Eric Olaf
Surface-mediated four-wave mixing of nanostructures with counterpropagating surface plasmon can be generated by the surface fields of traveling surface plasmon polariton modes. We have chosen evidence that the local field of loca- lized surface plasmons can boost the nonlinear optical signals from
Landslide Stability: Role of Rainfall-Induced, Laterally Propagating, Pore-Pressure Waves
Landslide Stability: Role of Rainfall-Induced, Laterally Propagating, Pore-Pressure Waves GEORGE R: Translational Landslide, Hydrogeology, Rainfall, Pore Pressure, Johnson Creek, Oregon ABSTRACT The Johnson Creek pore-water pressure in the basal shear zone in the form of pulses of water pressure traveling laterally
Kirby, James T.
@udel.edu, giorgio.bellotti@uniroma3.it 1. Objective Enhancement of Tsunami Early Warning Systems (TEWS) Hydro-acoustic wave detection as precursor component of tsunamis traveling at the speed of sound in water (1500 m]. Improving the accuracy of model by taking into account damping behavior of two layered system Introducing
Theory of the microelectronic traveling wave klystron amplifier with field-emission cathode array
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
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.
Microscale Fluid Flow Induced by Thermoviscous Expansion Along a Traveling Wave Franz M. Weinert,1
Kersting, Roland
Jonas A. Kraus,2 Thomas Franosch,2 and Dieter Braun1 1 Applied Physics and Center for NanoScience (Ce noted by Yariv et al. [8] that for the case of unsteady heating, this is no longer the case, and one can
Asymptotic Stability of Traveling Waves for Viscous Conservation Laws with Dispersion
the Rankine-Hugoniot condition f(u+ ) f(u ) s(u + u ) = 0 (1.4) and the Oleinik shock condition [12] f(u) f 2 by a general convex ux function f(u). This paper is organized as follows: In Section 2, we
EXISTENCE OF TRAVELING WAVES IN A BIODEGRADATION MODEL FOR ORGANIC CONTAMINANTS
Xin, Jack
technol- ogy for cleaning up subsurface organic contamination is in-situ bioremediation. This technique of restoration technologies, in- situ bioremediation has been shown to be the most economical for remediating 100 years to clean up using the pump and treat method; in-situ bioremediation took only 10 months [3
Effect of traveling waves on Vortex-Induced Vibration of long flexible cylinders
Jaiswal, Vivek, Ph. D. Massachusetts Institute of Technology
2009-01-01T23:59:59.000Z
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 ...
Ultrahigh-Speed Traveling-Wave Electroabsorption Modulator—Design and Analysis
Yu, Paul K.L.
1999-01-01T23:59:59.000Z
Electroabsorption Modulator—Design and Analysis G. L. Li,ULTRAHIGH-SPEED TW-EAM—DESIGN AND ANALYSIS Fig. 4. Effect ofSPEED TW-EAM—DESIGN AND ANALYSIS a discrete transmission
Global stability of travelling fronts for a damped wave equation with bistable
Gallay, Thierry
GALLAY & Romain JOLY Institut Fourier, UMR CNRS 5582 UniversitÂ´e de Grenoble I B.P. 74 38402 Saint.1) was first proved by Hadeler [19, 20], and a few stability results were subsequently obtained by Gallay
Global stability of travelling fronts for a damped wave equation with bistable
Gallay, Thierry
GALLAY & Romain JOLY Institut Fourier, UMR CNRS 5582 Universitâ??e de Grenoble I B.P. 74 38402 Saint.1) was first proved by Hadeler [19, 20], and a few stability results were subsequently obtained by Gallay
TRAVELING-WAVE TUBE AMPLIFIER CHARACTERISTICS STUDY FOR STOCHASTIC BEAM COOLING EXPERIMENTS
Leskovar, B.
2010-01-01T23:59:59.000Z
component for future stochastic beam cooling systems. Thefuture research and development efforts indi cate that large bandwidth cooling
Wave energy attenuation and shoreline alteration characteristics of submerged breakwaters
Krafft, Katherine Margaret
1993-01-01T23:59:59.000Z
- frequency X ? distance from original shoreline, (assuming a constant slope of 1: 15) Xt - centered and padded time series data CHAPTER I INTRODUCTION 1. 1 General The dynamic behavior of waves on a shore in conjunction with inadequate littoral drift... periodogram, the asymptotically unbiased estimate of the spectral density function, the centered and padded data, time, wave frequency, The relationship between the incident wave spectrum, S;(m), and the transmitted wave spectrum, St(w), can...
P-wave Indices to Detect Susceptibility to Atrial Fibrillation A Cabasson1
Boyer, Edmond
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
Broader source: Energy.gov [DOE]
Wave energy technologies extract energy directly from surface waves or from pressure fluctuations below the surface. Renewable energy analysts believe there is enough energy in ocean waves to provide up to 2 terawatts of electricity.
On semidefinite programming relaxations of the traveling salesman problem
de Klerk, Etienne; Sotirov, Renata; 10.1137/070711141
2009-01-01T23:59:59.000Z
We consider a new semidefinite programming (SDP) relaxation of the symmetric traveling salesman problem (TSP) that may be obtained via an SDP relaxation of the more general quadratic assignment problem (QAP). We show that the new relaxation dominates the one in [D. Cvetkovic, M. Cangalovic, and V. Kovacevic-Vujcic, Semidefinite programming methods for the symmetric traveling salesman problem, in Proc. 7th Int. IPCO Conference, Springer, London, 1999, pp. 126--136]. Unlike the bound of Cvetkovic et al., the new SDP bound is not dominated by the Held-Karp linear programming bound, or vice versa.
Phases of holographic d-wave superconductor
Krikun, Alexander
2015-01-01T23:59:59.000Z
We study different phases in the holographic model of d-wave superconductor. These are described by solutions to the classical equations of motion found in different ansatze. Apart from the known homogeneous d-wave superconducting phase we find three new solutions. Two of them represent two distinct families of the spatially modulated solutions, which realize the charge density wave phases in the dual theory. The third one is the new homogeneous phase with nonzero anapole moment. These phases are relevant to the physics of cuprate high-Tc superconductor in pseudogap region. While the d-wave phase preserves translation, parity and time reversal symmetry, the striped phases break translations spontaneously. Parity and time-reversal are preserved when combined with discrete half-periodic shift of the wave. In anapole phase translation symmetry is preserved, but parity and time reversal are spontaneously broken. All of the considered solutions brake the global $U(1)$. Thermodynamical treatment shows that in the s...
Solar Eclipse Anomalies and Wave Refraction
Alasdair Macleod
2006-10-23T23:59:59.000Z
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.
Investigation of an empirical methodology for linking value of time with census tract median income
Stockton, William Radney
2009-05-15T23:59:59.000Z
of Committee, Roger Smith Committee Members, Donald Smith Timothy Lomax Calvin Woods Head of Department, David Rosowsky December 2006 Major Subject: Civil Engineering iii ABSTRACT Investigation of an Empirical Methodology... ? President George Bush Turnpike, Dallas/Ft. Worth, TX .................19 7 Schematic of travel time data collection ..............................................................21 8 Simulation distribution of travel time differences...
Terminal Chaos: Why U.S. AirTravel Is
.S. aviation is far more serious than most people imagine. Airline deregulation, enacted in 1978, was a huge, as the aviation system nears catastrophic overload. Alfred Kahn, the father of airline deregulation, was one, continued growth in affordable air travel would be put at risk. For the first two decades of deregulation
University of California Policy G-28 Travel Regulations
Ishida, Yuko
......................................................... 7 D. Reimbursement Standards ...................................................... 7 IV. COMPLIANCE students, visiting scholars, and independent contractors. This policy does not apply to travel associated with work done within the scope of the UC/DOE contract for the management and operations of the Lawrence
HsO Travel/Conference Fee Award Background
Wright, Dawn Jeannine
HsO Travel/Conference Fee Award Background: The main purpose of the Hatfield Students Organization to present their research findings at professional conferences related to their field of study. To support student participation in such conferences, HsO, has created an annual award of $250 to help finance
Temperature Fields Produced by Traveling Distributed Heat Sources
Eagar, Thomas W.
Temperature Fields Produced by Traveling Distributed Heat Sources Use of a Gaussian heat distribution in dimensionless form indicates final weld pool shape can be predicted accurately for many welds information about both the size and the shape of arc weld pools. The results indicate that both welding
If the internship is international or involves international travel, the
Dahl, David B.
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
The Accumulated Experience Ant Colony for the Travelling Salesman Problem
Montgomery, James
The Accumulated Experience Ant Colony for the Travelling Salesman Problem Marcus Randall, James, as a consequence of this link, the rest of the path may be longer than if another link was chosen. The Accumulated city and the potential next city in conjunction with the distance. The accumulated experience ant
Equity Evaluation of Vehicle Miles Traveled Fees in Texas
Larsen, Lisa Kay
2012-10-19T23:59:59.000Z
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...
Equity Evaluation of Vehicle Miles Traveled Fees in Texas
Larsen, Lisa Kay
2012-10-19T23:59:59.000Z
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...
Student Travel to Pan-Am Congress of Plants & Biofuels in Merida...
Office of Scientific and Technical Information (OSTI)
Student Travel to Pan-Am Congress of Plants & Biofuels in Merida, Mexico Re-direct Destination: Department of Energy - Final Technical Report Grant Title: Student Travel to Pan-Am...
Kockelman, Kara M.
LIFE-CYCLE ENERGY IMPLICATIONS OF DIFFERENT RESIDENTIAL SETTINGS: RECOGNIZING BUILDINGS, TRAVEL with rigorously measured building stock and infrastructure materials quantities (to arrive at embodied energy, neighborhood design, built environment, vehicle-miles traveled, land use patterns, sustainability levers, smart
Posthuman Difference: Traveling to Utopia with Young-Hae Chang Heavy Industries
Liu, Warren
2012-01-01T23:59:59.000Z
with Young-Hae Chang Heavy Industries WARREN LIU In a 2007Young-Hae Chang Heavy Industries’ Traveling to Utopia: Withof Young-Hae Chang Heavy Industries’ digital text, Traveling
Urban Form and Travel Patterns at the Regional Scale Considering Polycentric Urban Structure
Yi, Young-Jae
2012-10-19T23:59:59.000Z
Increasing concerns about climate change have attracted global interests in reducing auto travel. Regional average vehicle miles traveled (VMT) vary across the urbanized areas in the U.S., suggesting a potential influence ...
Sherrill, David
Georgia Institute of Technology School of Chemistry and Biochemistry Johnson Graduate Student Travel funds may be used to meet any remaining costs not covered by the research advisor, SGA award_____________________________________________________ Total estimated costs for attending conference Transportation $_______________ Other Travel
Energy Secretary Steven Chu to Travel to Bay Area to Highlight...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Energy Secretary 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...
Driving and passengering: notes on the ordinary organisation of car travel
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
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 ...
Modlitba, Lisa Paulina
2008-01-01T23:59:59.000Z
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 ...
How Do You Go Green When You Travel? | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
be green. Choices such as less frequent linen service are opportunities to save water and energy while traveling. How do you go green when you travel? E-mail your responses to the...
Rossby wave radiation by an eddy on the polar beta-plane
Zhang, Yang
2015-01-01T23:59:59.000Z
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...
Some Wave Equations for Electromagnetism and Gravitation
Zi-Hua Weng
2010-08-11T23:59:59.000Z
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.
Refrigeration system having standing wave compressor
Lucas, Timothy S. (Glen Allen, VA)
1992-01-01T23:59:59.000Z
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.
California at Santa Barbara, University of
Verdes, Campus Point, Coal Oil Point (Sands) Waves propagate perpendicular to isobaths (lines of constant
Water 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 nonlinear waves. Throughout the theory is based on the traditional assumptions that water is inviscid
Revisiting time reversal and holography with spacetime transformations
Bacot, Vincent; Eddi, Antonin; Fink, Mathias; Fort, Emmanuel
2015-01-01T23:59:59.000Z
Wave control is usually performed by spatially engineering the properties of a medium. Because time and space play similar roles in wave propagation, manipulating time boundaries provides a complementary approach. Here, we experimentally demonstrate the relevance of this concept by introducing instantaneous time mirrors. We show with water waves that a sudden change of the effective gravity generates time-reversed waves that refocus at the source. We generalize this concept for all kinds of waves introducing a universal framework which explains the effect of any time disruption on wave propagation. We show that sudden changes of the medium properties generate instant wave sources that emerge instantaneously from the entire space at the time disruption. The time-reversed waves originate from these "Cauchy sources" which are the counterpart of Huygens virtual sources on a time boundary. It allows us to revisit the holographic method and introduce a new approach for wave control.
OP 79.05: International Travel DATE: Tracked1/17/14
Rock, Chris
of international travel to countries outside the United States. REVIEW: This OP will be reviewed in November of odd that is subject to a travel advisory issued by the United States Department of State. OIA will determine.024, Texas Government Code (Vernon's Civil Statutes Supplement, 2002), all international travel by state
TAKE-HOME EXP. # 7a Light Imagined as Traveling in Straight Lines
Pickett, Galen T.
TAKE-HOME EXP. # 7a Light Imagined as Traveling in Straight Lines: Sun Images in the Shade of a Tree. Our ordinary senses imply that light travels in a straight line. In fact, Isaac Newton was so convinced of light's straight-line travel that he proposed a particle model for light, saying: "Are
Zhou, Xuesong
Research and Education (ITRE) Department of Civil, Construction and Environmental Engineering North and varying degrees of traveler knowledge in an advanced traveler information provision environment to a simple corridor and medium-scale networks to illustrate the effectiveness of traveler information under
PPrreesseenntteedd bbyy tthhee FFAAUU TTrraavveell OOffffiiccee Year End Processing in Banner Travel
Fernandez, Eduardo
Travel: Between July 1, 2011 and until August 1, 2011, both the 2011 fiscal year and the 2012 fiscal year Travel Authorizations for Travel (TA forms), a delegate can control which fiscal year is affected by setting the report date given in the general information section, as seen here: If the report date is set
Grading of lumber using stress waves
Bethi, Rajeshwar
1994-01-01T23:59:59.000Z
The goal of this research was to develop stress wave grading technology suitable for small lumber mills. Specific goals include: 1) develop an ultrasonic probe configuration to facilitate real-time grain angle and edge knot measurement, 2) determine...
Electron Bernstein Wave Heating and Emission in the TCV Tokamak
Petitpierre, Claude
1 Electron Bernstein Wave Heating and Emission in the TCV Tokamak A. Mueck 1 , Y. Camenen 1 , S density tokamak plasmas is limited due to reflections of the waves at so-called wave cut-offs. Electron for the first time via the O-X- B mode conversion process in a standard aspect-ratio tokamak. The results
Wave turbulent statistics in non-weak wave turbulence
Naoto Yokoyama
2011-05-08T23:59:59.000Z
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.
UC San Diego Student Certification for Business-Related Travel Please complete this form and attach. This certification must be completed by the student and certified by a UC San Diego faculty member, a Principal Investigator (PI), or administrator. Reimbursement for UC San Diego Business-Related Travel To be completed
Wave amplification in the framework of forced nonlinear Schrodinger equation: the rogue wave context
Slunyaev, Alexey; Pelinovsky, Efim
2014-01-01T23:59:59.000Z
Irregular waves which experience the time-limited external forcing within the framework of the nonlinear Schrodinger (NLS) equation are studied numerically. Single forced envelope solitons are considered as well with the purpose to better identify the role of coherent wave groups. It is shown that the adiabatically slow pumping (the time scale of forcing is much longer than the nonlinear time scale) results in selective enhancement of the solitary part of the wave ensemble. The slow forcing provides eventually larger values of kurtosis and wider wavenumber spectra. In the opposite case of rapid forcing the nonlinear waves readjust passing through the stage of fast surges of statistical characteristics. An approximate description on the basis of solutions of the integrable NLS equation is provided. Applicability of the Benjamin-Feir Index to forecasting of conditions favourable for rogue waves is discussed
Travelers Rest, South Carolina: Energy Resources | Open Energy Information
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 onsource History View New PagessourceRavenandEconomiesEnergyTitle 29TraceTravale 3 Geothermal Power StationTravelers Rest,
GPS Travel Survey Data Collection and Analysis | Department of Energy
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 RankShale_Gas.pdfServiceDepartmentEnergyBatteries:NovemberonApplications |GCAMEnergyGOODSGPS Travel
Mission Travelers: Relationship-building and Crosscultural Adaptation
Lee, Yoon Jung
2012-10-19T23:59:59.000Z
. Many studies of STMs (Adeney, 2006; DeHainaut, 1995; Park, 2007; K. Priest, 2009; R. Priest, 2007; Priest & Dischinger, 2006; Schwartz, 2004; Slimbach, 2000) have focused on the interaction between STM travelers and the hosts. They have examined..., 2007; 13 Nah, 2000; MacDonald, 2006; Park, 2007; Parker, 2007; Peterson et al., 2003; Plueddemann, 2005; Priest & Dischinger, 2006; R. Priest, 2008; K. Priest, 2009; Radecke, 2007; Raines, 2008; Reese, 2007; Root, 2008; Schwartz, 2003...
Martin, Adam; Goryakin, Yevgeniy; Suhrcke, Marc
2014-08-23T23:59:59.000Z
to investigate how (i.) travel mode choice, (ii.)Keywords: Method. This study used dDoes active commuting improve psycholo evidence from eighteen waves of the Britis Adam Martin a,b,?, Yevgeniy Goryakin a,b, Marc Suhrck a Health Economics Group, Norwich Medical...
Henson, Kriste M [Los Alamos National Laboratory; Gou; ias, Konstadinos G [UCSB
2010-11-30T23:59:59.000Z
The ability to transfer national travel patterns to a local population is of interest when attempting to model megaregions or areas that exceed metropolitan planning organization (MPO) boundaries. At the core of this research are questions about the connection between travel behavior and land use, urban form, and accessibility. As a part of this process, a group of land use variables have been identified to define activity and travel patterns for individuals and households. The 2001 National Household Travel Survey (NHTS) participants are divided into categories comprised of a set of latent cluster models representing persons, travel, and land use. These are compared to two sets of cluster models constructed for two local travel surveys. Comparison of means statistical tests are used to assess differences among sociodemographic groups residing in localities with similar land uses. The results show that the NHTS and the local surveys share mean population activity and travel characteristics. However, these similarities mask behavioral heterogeneity that are shown when distributions of activity and travel behavior are examined. Therefore, data from a national household travel survey cannot be used to model local population travel characteristics if the goal to model the actual distributions and not mean travel behavior characteristics.
Cost Analysis of Plug-In Hybred Electric Vehicles Using GPS-Based Longitudinal Travel Data
Wu, Xing [Lamar University] [Lamar University; Dong, Jing [Iowa State University] [Iowa State University; Lin, Zhenhong [ORNL] [ORNL
2014-01-01T23:59:59.000Z
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.
Rogue Wave Modes for the Long Wave-Short Wave Resonance Kwok Wing CHOW*(1)
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
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Hartley, D. P.; Chen, Y.; Kletzing, C. A.; Denton, M. H.; Kurth, W. S.
2015-02-17T23:59:59.000Z
Most theoretical wave models require the power in the wave magnetic field in order to determine the effect of chorus waves on radiation belt electrons. However, researchers typically use the cold plasma dispersion relation to approximate the magnetic wave power when only electric field data are available. In this study, the validity of using the cold plasma dispersion relation in this context is tested using Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) observations of both the electric and magnetic spectral intensities in the chorus wave band (0.1–0.9 fce). Results from this study indicate that the calculated wavemore »intensity is least accurate during periods of enhanced wave activity. For observed wave intensities >10?³ nT², using the cold plasma dispersion relation results in an underestimate of the wave intensity by a factor of 2 or greater 56% of the time over the full chorus wave band, 60% of the time for lower band chorus, and 59% of the time for upper band chorus. Hence, during active periods, empirical chorus wave models that are reliant on the cold plasma dispersion relation will underestimate chorus wave intensities to a significant degree, thus causing questionable calculation of wave-particle resonance effects on MeV electrons.« less
Mathur, Manikandan S.
Internal waves are a ubiquitous and significant means of momentum and energy transport in the oceans, atmosphere, and astrophysical bodies. Here, we show that internal wave propagation in nonuniform density stratifications, ...
Wirosoetisno, Djoko
the Oscillating Water Column (OWC) device with wind turbine a new device with a more direct energy conversion? #12 & safety offshore structures Pyramidal rogue wave (Faulkner 2001): #12;Wave Control Onno Bokhove
Mercier, Matthieu J.
We present the results of a combined experimental and numerical study of the generation of internal waves using the novel internal wave generator design of Gostiaux et al. (Exp. Fluids, vol. 42, 2007, pp. 123–130). This ...
Surface acoustic wave dust deposition monitor
Fasching, G.E.; Smith, N.S. Jr.
1988-02-12T23:59:59.000Z
A system is disclosed for using the attenuation of surface acoustic waves to monitor real time dust deposition rates on surfaces. The system includes a signal generator, a tone-burst generator/amplifier connected to a transmitting transducer for converting electrical signals into acoustic waves. These waves are transmitted through a path defining means adjacent to a layer of dust and then, in turn, transmitted to a receiving transducer for changing the attenuated acoustic wave to electrical signals. The signals representing the attenuated acoustic waves may be amplified and used in a means for analyzing the output signals to produce an output indicative of the dust deposition rates and/or values of dust in the layer. 8 figs.
Internal wave instability: Wave-wave versus wave-induced mean flow interactions
Sutherland, Bruce
, known as parametric sub- harmonic instability, results generally when a disturbance of one frequency imparts energy to disturbances of half that frequency.13,14 Generally, a plane periodic internal wave, energy from primary waves is transferred, for example, to waves with half frequency. Self
Degasperis, Antonio; Aceves, Alejandro B
2015-01-01T23:59:59.000Z
We derive the rogue wave solution of the classical massive Thirring model, that describes nonlinear optical pulse propagation in Bragg gratings. Combining electromagnetically induced transparency with Bragg scattering four-wave mixing, may lead to extreme waves at extremely low powers.
Performance Assessment of the Wave Dragon Wave Energy Converter
Hansen, René Rydhof
Performance Assessment of the Wave Dragon Wave Energy Converter Based on the EquiMar Methodology S of the wave energy sector, device developers are called to provide reliable estimates on power performanceMar, Nissum Bredning, Hanstholm, North Sea, Ekofisk, Wave-to-wire, Wave energy. I. INTRODUCTION The wave
S. Pireaux
2007-03-23T23:59:59.000Z
The LISA mission is a space interferometer aiming at the detection of gravitational waves in the [$10^{-4}$,$10^{-1}$] Hz frequency band. In order to reach the gravitational wave detection level, a Time Delay Interferometry (TDI) method must be applied to get rid of (most of) the laser frequency noise and optical bench noise. This TDI analysis is carried out in terms of the coordinate time corresponding to the Barycentric Coordinate Reference System (BCRS), TCB, whereas the data at each of the three LISA stations is recorded in terms of each station proper time. We provide here the required proper time versus BCRS time transformation. We show that the difference in rate of station proper time versus TCB is of the order of $5 10^{-8}$. The difference between station proper times and TCB exhibits an oscillatory trend with a maximum amplitude of about $10^{-3}$ s.
Wave Power Demonstration Project at Reedsport, Oregon
Mekhiche, Mike [Principal Investigator] [Principal Investigator; Downie, Bruce [Project Manager] [Project Manager
2013-10-21T23:59:59.000Z
Ocean wave power can be a significant source of large?scale, renewable energy for the US electrical grid. The Electrical Power Research Institute (EPRI) conservatively estimated that 20% of all US electricity could be generated by wave energy. Ocean Power Technologies, Inc. (OPT), with funding from private sources and the US Navy, developed the PowerBuoy? to generate renewable energy from the readily available power in ocean waves. OPT's PowerBuoy converts the energy in ocean waves to electricity using the rise and fall of waves to move the buoy up and down (mechanical stroking) which drives an electric generator. This electricity is then conditioned and transmitted ashore as high?voltage power via underwater cable. OPT's wave power generation system includes sophisticated techniques to automatically tune the system for efficient conversion of random wave energy into low cost green electricity, for disconnecting the system in large waves for hardware safety and protection, and for automatically restoring operation when wave conditions normalize. As the first utility scale wave power project in the US, the Wave Power Demonstration Project at Reedsport, OR, will consist of 10 PowerBuoys located 2.5 miles off the coast. This U.S. Department of Energy Grant funding along with funding from PNGC Power, an Oregon?based electric power cooperative, was utilized for the design completion, fabrication, assembly and factory testing of the first PowerBuoy for the Reedsport project. At this time, the design and fabrication of this first PowerBuoy and factory testing of the power take?off subsystem are complete; additionally the power take?off subsystem has been successfully integrated into the spar.
A Predictive power control of Doubly Fed Induction Generator for Wave Energy Converter
Brest, Université de
A Predictive power control of Doubly Fed Induction Generator for Wave Energy Converter in Irregular there are several wave energy converters to harness this energy. Some of them, as in tidal applications, use based Wave Energy Converter under irregular wave climate which is modeled as time series elevation from
Alla Weinstein, Dominique Roddier, Kevin Banister
2012-03-30T23:59:59.000Z
Principle Power Inc. and National Renewable Energy Lab (NREL) have completed a contract to assess the technical and economic feasibility of integrating wave energy converters into the WindFloat, resulting in a new concept called the WindWaveFloat (WWF). The concentration of several devices on one platform could offer a potential for both economic and operational advantages. Wind and wave energy converters can share the electrical cable and power transfer equipment to transport the electricity to shore. Access to multiple generation devices could be simplified, resulting in cost saving at the operational level. Overall capital costs may also be reduced, provided that the design of the foundation can be adapted to multiple devices with minimum modifications. Finally, the WindWaveFloat confers the ability to increase energy production from individual floating support structures, potentially leading to a reduction in levelized energy costs, an increase in the overall capacity factor, and greater stability of the electrical power delivered to the grid. The research conducted under this grant investigated the integration of several wave energy device types into the WindFloat platform. Several of the resulting system designs demonstrated technical feasibility, but the size and design constraints of the wave energy converters (technical and economic) make the WindWaveFloat concept economically unfeasible at this time. Not enough additional generation could be produced to make the additional expense associated with wave energy conversion integration into the WindFloat worthwhile.
Coastal Wave Generation and Wave Breaking over Terrain: Two Problems in Mesoscale Wave Dynamics
Qian, Tingting
2010-07-14T23:59:59.000Z
Two problems in mesoscale wave dynamics are addressed: (i) wave-turbulence interaction in a breaking mountain wave and (ii) gravity wave generation associated with coastal heating gradients. The mean and turbulent structures in a breaking mountain...
Coastal Wave Generation and Wave Breaking over Terrain: Two Problems in Mesoscale Wave Dynamics
Qian, Tingting
2010-07-14T23:59:59.000Z
Two problems in mesoscale wave dynamics are addressed: (i) wave-turbulence interaction in a breaking mountain wave and (ii) gravity wave generation associated with coastal heating gradients. The mean and turbulent structures in a breaking mountain...
Travel/Accountant Specialist | Princeton Plasma Physics Lab
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Traveling to Princeton (NEW) - Combustion Energy Frontier Research Center
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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), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of WntSupportB 18B()The57TowardTravel/Accountant Specialist Department:FAQ
ORISE: Travelers' Health Campaign | How ORISE is Making a Difference
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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Better World Club Travel Cool | Open Energy Information
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 DeliciousPlasmaP a g eWorksVillage of Brewster,Applied OpticalBenson, Arizona: EnergyBernalilloBetter World Club Travel
PIA - Foreign Travel Management System (FTMS) | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
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), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 ofSubscribe to AcquisitionJen Carter WhatTo|DOE OCIO, Open Government PlanTravel Management