11-ft Wave Flume Facility | Open Energy Information
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Delft Hydraulic's Large Wind-Wave Flume Paul van Vliet 1
Jaehne, Bernd
499 Delft Hydraulic's Large Wind-Wave Flume Paul van Vliet 1 , Frank Hering 2 , and Bernd J¨ahne 2,3 1 Waterloopkundig Laboratorium, Delft Hydraulics Laboratory Rotterdamseweg 185, NL-2692 HD Delft in the seventies, Delft Hydraulics large wind wave flume was totally overhauled to fit the needs of scientists
Yim, Solomon C.
and storm surge behaviors are critical in order to develop appropriate warning systems and evacuation1 International Collaborative Tsunamis, Storm Surge, and Wave-Structure Interaction Research experimental facility for tsunami and wave- structure interaction research, supported by the US National
Stennis Flume | Open Energy Information
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Erosion Flume | Open Energy Information
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Suspended sediment erosion in laboratory flume experiments
Cornell, Katrina Muir
2007-01-01T23:59:59.000Z
Laboratory flume experiments are used to examine the role of suspended sediment abrasion in bedrock channel erosion. A range of topographies was used, from a planar bed to a sinuous and scalloped inner channel. Experiments ...
Steep Gradient Flume | Open Energy Information
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Alden Large Flume | Open Energy Information
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Flume construction on King Hill irrigation project
Ward, Walter
1921-01-01T23:59:59.000Z
/ I FiGUffE N* A floor and walls are 6 inches in thickness and the side walls are reinforced as cantilevers so that no cross ties are necessary. Although the flume will carry the required capacity with a free board of one foot, the side walls... to force cracks at the same intervals with the same range of temperature. The side walls were designed as vertical cantilevers -17- and required no cross ties. By reference to figure Ho. 4, it will be noted that the side wall forms a right angle...
Adjustable shear stress erosion and transport flume
Roberts, Jesse D. (Carlsbad, NM); Jepsen, Richard A. (Carlsbad, NM)
2002-01-01T23:59:59.000Z
A method and apparatus for measuring the total erosion rate and downstream transport of suspended and bedload sediments using an adjustable shear stress erosion and transport (ASSET) flume with a variable-depth sediment core sample. Water is forced past a variable-depth sediment core sample in a closed channel, eroding sediments, and introducing suspended and bedload sediments into the flow stream. The core sample is continuously pushed into the flow stream, while keeping the surface level with the bottom of the channel. Eroded bedload sediments are transported downstream and then gravitationally separated from the flow stream into one or more quiescent traps. The captured bedload sediments (particles and aggregates) are weighed and compared to the total mass of sediment eroded, and also to the concentration of sediments suspended in the flow stream.
Bathymetric evolution of sand bed forms under partially standing waves
Landry, Blake Jude
2004-01-01T23:59:59.000Z
Experiments were conducted in a large wave flume where the interaction between water waves and a movable sand bed were investigated. Monochromatic and poly- chromatic waves of specified amplitudes and period were generated ...
Generation of sand bars under surface waves
Hancock, Matthew James, 1975-
2005-01-01T23:59:59.000Z
(cont.) Experiments were performed in a large wave flume to validate the theory and to study additional aspects of sand bar evolution. The wave envelope and bar profile were recorded for low and high beach reflection, ...
Hydrodynamic Tesla Wheel Flume for Model and Prototype Testing
Wood, Stephen L.
Hydrodynamic Tesla Wheel Flume for Model and Prototype Testing Spencer Jenkins, Chris Scott, Jacob Engineering department at Florida Institute of Technology (Florida Tech) has developed a Hydrodynamic Tesla, hydrodynamic, laminar, fluid, flow, model, prototype testing, Tesla wheel. I. INTRODUCTION The southeast region
1.5-ft Wave Flume Facility | Open Energy Information
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10-ft Wave Flume Facility | Open Energy Information
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3-ft Wave Flume Facility | Open Energy Information
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5-ft Wave Flume Facility | Open Energy Information
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6-ft Wave Flume Facility | Open Energy Information
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L-Shaped Flume Wave Basin | Open Energy Information
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Flume Studies of Sediment Transportation in Shallow Flow with Simulated Rainfall
Nail, F.M.
TR-2 1966 Flume Studies of Sediment Transportation in Shallow Flow with Simulated Rainfall F.M. Nail Texas Water Resources Institute Texas A&M University ...
DeFrees Flume 3 | Open Energy Information
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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
FLUME-PRISM Workshop Met Office, Exeter, March 15-16, 2004
FLUME-PRISM Workshop Met Office, Exeter, March 15-16, 2004 OASIS3 and OASIS4 : the PRISM couplers G-16, 2004 Slide 2 Outline OASIS historic OASIS community today PRISM first coupler: Oasis3 ·model adaptation ·coupled model configuration ·communication ·interpolations/transformations PRISM final coupler: Oasis4
Oscillatory erosion and transport flume with superimposed unidirectional flow
Jepsen, Richard A.; Roberts, Jesse D.
2004-01-20T23:59:59.000Z
A method and apparatus for measuring erosion rates of sediments and at high shear stresses due to complex wave action with, or without, a superimposed unidirectional current. Water is forced in a channel past an exposed sediment core sample, which erodes sediments when a critical shear stress has been exceeded. The height of the core sample is adjusted during testing so that the sediment surface remains level with the bottom of the channel as the sediments erode. Complex wave action is simulated by driving tandom piston/cylinder mechanisms with computer-controlled stepper motors. Unidirectional flow, forced by a head difference between two open tanks attached to each end of the channel, may be superimposed on to the complex wave action. Sediment traps may be used to collect bedload sediments. The total erosion rate equals the change in height of the sediment core sample divided by a fixed period of time.
Environmental Effects of Hydrokinetic Turbines on Fish: Desktop and Laboratory Flume Studies
Jacobson, Paul T. [Electric Power Research Institute; Amaral, Stephen V. [Alden Research Laboratory; Castro-Santos, Theodore [U.S. Geological Survey; Giza, Dan [Alden Research Laboratory; Haro, Alexander J. [U.S. Geological Survey; Hecker, George [Alden Research Laboratory; McMahon, Brian [Alden Research Laboratory; Perkins, Norman [Alden Research Laboratory; Pioppi, Nick [Alden Research Laboratory
2012-12-31T23:59:59.000Z
This collection of three reports describes desktop and laboratory flume studies that provide information to support assessment of the potential for injury and mortality of fish that encounter hydrokinetic turbines of various designs installed in tidal and river environments. Behavioral responses to turbine exposure also are investigated to support assessment of the potential for disruptions to upstream and downstream movements of fish. The studies: (1) conducted an assessment of potential injury mechanisms using available data from studies with conventional hydro turbines; (2) developed theoretical models for predicting blade strike probabilities and mortality rates; and (3) performed flume testing with three turbine designs and several fish species and size groups in two laboratory flumes to estimate survival rates and document fish behavior. The project yielded three reports which this document comprises. The three constituent documents are addressed individually below Fish Passage Through Turbines: Application of Conventional Hydropower Data to Hydrokinetic Technologies Fish passing through the blade sweep of a hydrokinetic turbine experience a much less harsh physical environment than do fish entrained through conventional hydro turbines. The design and operation of conventional turbines results in high flow velocities, abrupt changes in flow direction, relatively high runner rotational and blade speeds, rapid and significant changes in pressure, and the need for various structures throughout the turbine passageway that can be impacted by fish. These conditions generally do not occur or are not significant factors for hydrokinetic turbines. Furthermore, compared to conventional hydro turbines, hydrokinetic turbines typically produce relatively minor changes in shear, turbulence, and pressure levels from ambient conditions in the surrounding environment. Injuries and mortality from mechanical injuries will be less as well, mainly due to low rotational speeds and strike velocities, and an absence of structures that can lead to grinding or abrasion injuries. Additional information is needed to rigorously assess the nature and magnitude of effects on individuals and populations, and to refine criteria for design of more fish-friendly hydrokinetic turbines. Evaluation of Fish Injury and Mortality Associated with Hydrokinetic Turbines Flume studies exposed fish to two hydrokinetic turbine designs to determine injury and survival rates and to assess behavioral responses. Also, a theoretical model developed for predicting strike probability and mortality of fish passing through conventional hydro turbines was adapted for use with hydrokinetic turbines and applied to the two designs evaluated during flume studies. The flume tests were conducted with the Lucid spherical turbine (LST), a Darrieus-type (cross flow) turbine, and the Welka UPG, an axial flow propeller turbine. Survival rates for rainbow trout tested with the LST were greater than 98% for both size groups and approach velocities evaluated. Turbine passage survival rates for rainbow trout and largemouth bass tested with the Welka UPG were greater than 99% for both size groups and velocities evaluated. Injury rates of turbine-exposed fish were low with both turbines and generally comparable to control fish. Video observations of the LST demonstrated active avoidance of turbine passage by a large proportion fish despite being released about 25 cm upstream of the turbine blade sweep. Video observations from behavior trials indicated few if any fish pass through the turbines when released farther upstream. The theoretical predictions for the LST indicated that strike mortality would begin to occur at an ambient current velocity of about 1.7 m/s for fish with lengths greater than the thickness of the leading edge of the blades. As current velocities increase above 1.7 m/s, survival was predicted to decrease for fish passing through the LST, but generally remained high (greater than 90%) for fish less than 200 mm in length. Strike mortality was not predicted to occur duri
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...
Hydrodynamic forces due to waves and a current induced on a pipeline placed in an open trench
Lee, Jaeyoung
1991-01-01T23:59:59.000Z
. For the first test, calibration was carried out in a small wave flume with an electric carnage. This carriage is designed to move at a steady speed in the range of 0. 5 ? 8. 0 fps (15 ? 24 cm/sec). The probe support, which has a hot ? wire anemometer at its.... This proves that the calibration has to be done at the same water temperature as the temperature in which the probe will be employed. Since the test wave flume is not equipped with a carriage, a small plastic ball (OD = 0. 197 in. (0. 5 cm)) was placed...
Sea ice floes dissipate the energy of steep ocean waves
Toffoli, Alessandro; Meylan, Michael H; Cavaliere, Claudio; Alberello, Alberto; Elsnab, John; Monty, Jason P
2015-01-01T23:59:59.000Z
Wave attenuation by ice floes is an important parameter for modelling the Arctic Oceans. At present, attenuation coefficients are extracted from linear models as a function of the incident wave period and floe thickness. Recent explorations in the Antarctic Mixed Ice Zone (MIZ) revealed a further dependence on wave amplitude, suggesting that nonlinear contributions are non-negligible. An experimental model for wave attenuation by a single ice floe in a wave flume is here presented. Observations are compared with linear predictions based on wave scattering. Results indicate that linear models perform well under the effect of gently sloping waves. For more energetic wave fields, however, transmitted wave height is normally over predicted. Deviations from linearity appear to be related to an enhancement of wave dissipation induced by unaccounted wave-ice interaction processes, including the floe over wash.
An investigation of the effects of progressive waves on an oil slick retained by an absorber beach
Huang, Yau-Ming Kennith
1973-01-01T23:59:59.000Z
minutes time interval was chosen so that the spreading oil never reached the wave screen or wave generator. Measurement of Wave Induced Mass Transport Since the oil slick setup induced by waves is an effect of mass transport in waves and energy... ?\\ i n n n n 'x n (in. //&C. ) in. ) 12 20 FIG. 28. -niASS TRANSPORT PROFILES ALONG WAVE FLUME (NO OIL; 8/L ~ 0. 060, 85 WAVE) Oil Slick Front at 36 ft from Wave Screen; Rear at 1. 5 ft from Beach Oi -. 5 0 &5 (in. /sac. & g ( in...
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.
Numerical modeling of boundary layer flow under shoaling and breaking waves
Pattipawaej, Olga Catherina
1998-01-01T23:59:59.000Z
velocities and shear stresses in the bottom boundary layer under breaking waves. The experiment wss conducted in the Precision Wave Tank located in the Ocean Engineering Laboratory at the University of Delaware. The flume was 33 m long, 0. 6 m wide, and 1... modeling of surf zone hydrodynamics. " Rep. No. CACR-95-97, Center for Applied Coastal Research, University Delaware, Newark, Delaware. Cox, D. T. , Kobayashi, N. , and Okayasu, A. (1996). "Bottom shear stress in the surf zone. " J. Geophys. Res. , 101(C...
Flume | Open Energy Information
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Theoretical and experimental evidence of non-symmetric doubly localized rogue waves
Jingsong He; Lijuan Guo; Yongshuai Zhang; Amin Chabchoub
2014-07-27T23:59:59.000Z
We present determinant expressions for vector rogue wave solutions of the Manakov system, a two-component coupled nonlinear Schr\\"odinger equation. As special case, we generate a family of exact and non-symmetric rogue wave solutions of the nonlinear Schr\\"odinger equation up to third-order, localized in both space and time. The derived non-symmetric doubly-localized second-order solution is generated experimentally in a water wave flume for deep-water conditions. Experimental results, confirming the characteristic non-symmetric pattern of the solution, are in very good agreement with theory as well as with numerical simulations, based on the modified nonlinear Schr\\"odinger equation, known to model accurately the dynamics of weakly nonlinear wave packets in deep-water.
Environmental Flume | Open Energy Information
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Kennedy Flume | Open Energy Information
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Horizontal and Vertical Erosion Flume
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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Scripps Flume | Open Energy Information
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Teaching Flume | Open Energy Information
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Anderson, Mary Elizabeth
2011-10-21T23:59:59.000Z
nor implemented in current hydrodynamic models. A series of laboratory experiments were conducted at the Haynes Coastal Engineering Laboratory and in a two-dimensional flume at Texas A and M University to investigate the influence of relative...
Anderson, Mary Elizabeth
2011-10-21T23:59:59.000Z
nor implemented in current hydrodynamic models. A series of laboratory experiments were conducted at the Haynes Coastal Engineering Laboratory and in a two-dimensional flume at Texas A and M University to investigate the influence of relative...
Contents lists available at ScienceDirect. Wave Motion .... The mudstone layers are fully saturated with water and their properties are frequency independent.
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.
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
Wave Propagation in Multiferroic Materials
Keller, Scott Macklin
2013-01-01T23:59:59.000Z
130 SAW Waves . . . . . . . . . . . . . .QuasiStatic MEE Waves . . . . . . . . . . . . . . . . . . .General MEE Wave Solution . . . . . . . . . . . .
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.
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
Bucknell Hydraulic Flume | Open Energy Information
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2-ft Flume Facility | Open Energy Information
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Sectional Model Flume Facilities | Open Energy Information
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Sediment Basin Flume | Open Energy Information
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Alden Small Flume | Open Energy Information
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NHC Large Flume | Open Energy Information
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Conte Small Flume | Open Energy Information
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Conte Large Flume | Open Energy Information
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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.
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.
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
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
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
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 ...
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
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...
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.
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
Wave momentum flux parameter: a descriptor for nearshore waves
US Army Corps of Engineers
Wave momentum flux parameter: a descriptor for nearshore waves Steven A. Hughes* US Army Engineer Available online 7 October 2004 Abstract A new parameter representing the maximum depth-integrated wave momentum flux occurring over a wave length is proposed for characterizing the wave contribution
Structure-borne sound Flexural wave (bending wave)
Berlin,Technische Universität
1 Structure-borne sound · Flexural wave (bending wave) »One dimensional (beam) +(/x)dx +(/x)dx = (/x) (/x)dx=(2/x2)dx Mz +(Mz/x)dx Mz vy Fy Fy +(Fy/x)dx Structure-borne sound · Bending wave flexural wave #12;2 Structure-borne sound · Two obliquely propagating waves + - + + - + - Structure
Mats Ehrnström; Erik Wahlén
2013-10-31T23:59:59.000Z
We construct three-dimensional families of small-amplitude gravity-driven rotational steady water waves on finite depth. The solutions contain counter-currents and multiple crests in each minimal period. Each such wave generically is a combination of three different Fourier modes, giving rise to a rich and complex variety of wave patterns. The bifurcation argument is based on a blow-up technique, taking advantage of three parameters associated with the vorticity distribution, the strength of the background stream, and the period of the wave.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Fisher Research Group Layered Chalcogenides 29 February 2008 Controlling the Wave by Brad Plummer, SLAC Communications Stanford University researchers working in part at SSRL have...
Wave Energy Resource Assessment | Department of Energy
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Wave Energy Resource Assessment Wave Energy Resource Assessment Wave Energy Resource Assessment 52waveresourceassessmenteprijacobson.ppt More Documents & Publications OTEC...
Wave Energy challenges and possibilities
© Wave Energy challenges and possibilities By: Per Resen Steenstrup www.WaveStarEnergy.com Risø-R-1608(EN) 161 #12;© Wave energy is an old story.... The first wave energy patent is 200 years old. Over the last 100 years more than 200 new wave energy devices have been developped and more than 1.000 patents
Wave Energy Resource Analysis for Use in Wave Energy Conversion
Pastor, J.; Liu, Y.; Dou, Y.
2014-01-01T23:59:59.000Z
In order to predict the response of wave energy converters an accurate representation of the wave climate resource is crucial. This paper gives an overview of wave resource modeling techniques as well as detailing a methodology for estimating...
Microstructural Design for Stress Wave Energy Management /
Tehranian, Aref
2013-01-01T23:59:59.000Z
Nasser, S. , 2010. Stress-wave energy management throughNemat-Nasser, Stress-wave energy management through materialconstitute pressure wave energy and/or shear wave energy.
Wave-Corpuscle Mechanics for Electric Charges
Babin, Anatoli; Figotin, Alexander
2010-01-01T23:59:59.000Z
superposition in nonlinear wave dynamics. Rev. Math. Phys.6. Babin, A. , Figotin, A. : Wave-corpuscle mechanics forV. , Fortunato, D. : Solitary waves in the nonlinear wave
Harmonic generation of gravitational wave induced Alfven waves
Mats Forsberg; Gert Brodin
2007-11-26T23:59:59.000Z
Here we consider the nonlinear evolution of Alfven waves that have been excited by gravitational waves from merging binary pulsars. We derive a wave equation for strongly nonlinear and dispersive Alfven waves. Due to the weak dispersion of the Alfven waves, significant wave steepening can occur, which in turn implies strong harmonic generation. We find that the harmonic generation is saturated due to dispersive effects, and use this to estimate the resulting spectrum. Finally we discuss the possibility of observing the above process.
Electromagnetic Wave Dynamics in
Kaiser, Robin
Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases Robin Kaiser and Mark D. Havey Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases #12;39 E xperimental developments permit in the transport proper- ties of electromagnetic radiation in strongly scattering random media. Even in weakly
Bieber, Michael
CATCHING THE FOURTH WAVE YOU MAY HAVE RIDDEN THEM YOURSELF -- the swells that develop farther out beyond Toffler, the fourth wave -- biologi- cal intelligence and medical technology -- is on the horizon second and fourth nationally in terms of cities that receive the most research funds from the National
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.
Recirculation in multiple wave conversions
Brizard, A.J.
2008-01-01T23:59:59.000Z
model lies with the simple wave energy conservation law itthe recirculation of wave energy introduces interference e?particles, the tertiary-wave energy may be negative and thus
B. V. Ivanov
1997-05-21T23:59:59.000Z
A coordinate transformation is found which diagonalizes the axisymmetric pp-waves. Its effect upon concrete solutions, including impulsive and shock waves, is discussed.
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.
Long wave expansions for water waves over random topography
Craig, Walter
Long wave expansions for water waves over random topography Anne de Bouard1 , Walter Craig2 interacting with the random bottom. We show that the resulting influence of the random topography is expressed numbers: 76B15, 35Q53, 76M50, 60F17 Keywords :Water waves, random topography, long wave asymptotics #12
Shallow Water Waves and Solitary Waves Willy Hereman
Hereman, Willy A.M.
. Water Wave Experiments and Observations VII. Future Directions VIII. Bibliography Glossary Deep water A surface wave is said to be in deep water if its wavelength is much shorter than the local water depthShallow Water Waves and Solitary Waves Willy Hereman Department of Mathematical and Computer
WAVE ENERGY RESOURCE CHARACTERIZATION US NAVY WAVE ENERGY TEST SITE
WAVE ENERGY RESOURCE CHARACTERIZATION AT THE US NAVY WAVE ENERGY TEST SITE AND OTHER LOCATIONS hindcasting from surface winds provides an important source of information for wave energy resource assessment the US Navy Wave Energy Test Site (WETS) offshore of the Marine Corps Base in Kaneohe, Oahu. One
Evolution of Rogue Waves in Interacting Wave Systems
A. Grönlund; B. Eliasson; M. Marklund
2009-04-03T23:59:59.000Z
Large amplitude water waves on deep water has long been known in the sea faring community, and the cause of great concern for, e.g., oil platform constructions. The concept of such freak waves is nowadays, thanks to satellite and radar measurements, well established within the scientific community. There are a number of important models and approaches for the theoretical description of such waves. By analyzing the scaling behavior of freak wave formation in a model of two interacting waves, described by two coupled nonlinear Schroedinger equations, we show that there are two different dynamical scaling behaviors above and below a critical angle theta_c of the direction of the interacting waves below theta_c all wave systems evolve and display statistics similar to a wave system of non-interacting waves. The results equally apply to other systems described by the nonlinear Schroedinger equations, and should be of interest when designing optical wave guides.
Kim, Seoktae
2006-04-12T23:59:59.000Z
New millimeter wave interferometric, multifunctional sensors have been studied for industrial sensing applications: displacement measurement, liquid-level gauging and velocimetry. Two types of configuration were investigated to implement the sensor...
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.
Minnesota, University of
LABORATORY VII: WAVE OPTICS Lab VII - 1 In this lab, you will solve problems in ways that take-like behavior. These conditions may be less familiar to you than the conditions for which geometrical optics
Cavaleri, Luigi; Bidlot, Jean-Raymond
2015-01-01T23:59:59.000Z
We consider the effect of rain on wind wave generation and dissipation. Rain falling on a wavy surface may have a marked tendency to dampen the shorter waves in the tail of the spectrum, the related range increasing with the rain rate. Following the coupling between meteorological and wave models, we derive that on the whole this should imply stronger wind and higher waves in the most energetic part of the spectrum. This is supported by numerical experiments. However, a verification based on the comparison between operational model results and measured data suggests that the opposite is true. This leads to a keen analysis of the overall process, in particular on the role of the tail of the spectrum in modulating the wind input and the white-capping. We suggest that the relationship between white-capping and generation by wind is deeper and more implicative than presently generally assumed.
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.
Halliday, David Fraser
2009-01-01T23:59:59.000Z
This thesis concerns the application of seismic interferometry to surface waves. Seismic interferometry is the process by which the wavefield between two recording locations is estimated, resulting in new recordings at ...
Wave Propagation in Multiferroic Materials
Keller, Scott Macklin
2013-01-01T23:59:59.000Z
Waves in Magnetoelectric Materials . . . Need forApplication of Multiferroic Materials to Receive AntennaMaterials . . . . . . . . . . . . . . . . . . . . . . . . .
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.
Lucas, Timothy S. (4614 River Mill Ct., Glen Allen, VA 23060)
1991-01-01T23:59:59.000Z
A compressor for compression-evaporation cooling systems, which requires no moving parts. A gaseous refrigerant inside a chamber is acoustically compressed and conveyed by means of a standing acoustic wave which is set up in the gaseous refrigerant. This standing acoustic wave can be driven either by a transducer, or by direct exposure of the gas to microwave and infrared sources, including solar energy. Input and output ports arranged along the chamber provide for the intake and discharge of the gaseous refrigerant. These ports can be provided with optional valve arrangements, so as to increase the compressor's pressure differential. The performance of the compressor in either of its transducer or electromagnetically driven configurations, can be optimized by a controlling circuit. This controlling circuit holds the wavelength of the standing acoustical wave constant, by changing the driving frequency in response to varying operating conditions.
Yerganian, Simon Scott (Lee's Summit, MO)
2003-02-11T23:59:59.000Z
A piezoelectric motor having a stator in which piezoelectric elements are contained in slots formed in the stator transverse to the desired wave motion. When an electric field is imposed on the elements, deformation of the elements imposes a force perpendicular to the sides of the slot, deforming the stator. Appropriate frequency and phase-shifting of the electric field will produce a wave in the stator and motion in a rotor. In a preferred aspect, the piezoelectric elements are configured so that deformation of the elements in the direction of an imposed electric field, generally referred to as the d.sub.33 direction, is utilized to produce wave motion in the stator. In a further aspect, the elements are compressed into the slots so as to minimize tensile stresses on the elements in use.
Yerganian, Simon Scott (Lee's Summit, MO)
2001-07-17T23:59:59.000Z
A piezoelectric motor having a stator in which piezoelectric elements are contained in slots formed in the stator transverse to the desired wave motion. When an electric field is imposed on the elements, deformation of the elements imposes a force perpendicular to the sides of the slot, deforming the stator. Appropriate frequency and phase shifting of the electric field will produce a wave in the stator and motion in a rotor. In a preferred aspect, the piezoelectric elements are configured so that deformation of the elements in direction of an imposed electric field, generally referred to as the d.sub.33 direction, is utilized to produce wave motion in the stator. In a further aspect, the elements are compressed into the slots so as to minimize tensile stresses on the elements in use.
Catching a Wave: Innovative Wave Energy Device Surfs for Power...
Broader source: Energy.gov (indexed) [DOE]
The Azura device sits 30m out from the Wave Energy Test Site (WETS) in Oahu. The Azura device sits 30m out from the Wave Energy Test Site (WETS) in Oahu. With support from the...
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 ...
mm-Wave Phase Shifters and Switches
Adabi Firouzjaei, Ehsan
2010-01-01T23:59:59.000Z
combiners . . . . . . . . . . . 5.3 mm-Wave implementationfailed to predict current mm-wave design trend [1] . . . . .solutions . . . . . . . . mm-wave imaging for medical and
California Small Hydropower and Ocean Wave Energy
California Small Hydropower and Ocean Wave Energy Resources IN SUPPORT OF THE 2005 INTEGRATED....................................................................................................................... 9 Ocean Wave Energy............................................................................................................. 20 Wave Energy Conversion Technology
Guided wave monitoring of prestressing tendons
Nucera, Claudio
2010-01-01T23:59:59.000Z
and applications of ultrasonic waves. CRC series in pure andStrands by Guided Stress Waves, ASCE Journal of Materials inin Cable Stays via Guided Wave Magnetostrictive Ultrasonics,
mm-Wave Phase Shifters and Switches
Adabi Firouzjaei, Ehsan
2010-01-01T23:59:59.000Z
4.1.1 Slow wave transmissioncombiners . . . . . . . . . . . 5.3 mm-Wave implementationfailed to predict current mm-wave design trend [1] . . . . .
Wave refraction and wave energy on Cayo Arenas
Walsh, Donald Eugene
1962-01-01T23:59:59.000Z
WAVE REFRACTION AND WAVE ENERGY ON CAYO ARENAS A Thesis By Donald E. Welsh Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... January 1962 Major Subject: Physical Oceanography WAVE REFRACTION AND WAVE ENERGY ON CAYO ARENAS A Thesis Donald E. Walsh Approved as to style and content by: Chairman of the Committee ead of Department ' / January 1962 ACKNOWLEDGMENTS...
Wave refraction and wave energy on Cayo Arenas
Walsh, Donald Eugene
1962-01-01T23:59:59.000Z
WAVE REFRACTION AND WAVE ENERGY ON CAYO ARENAS A Thesis By Donald E. Welsh Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... January 1962 Major Subject: Physical Oceanography WAVE REFRACTION AND WAVE ENERGY ON CAYO ARENAS A Thesis Donald E. Walsh Approved as to style and content by: Chairman of the Committee ead of Department ' / January 1962 ACKNOWLEDGMENTS...
LONG WAVE EXPANSIONS FOR WATER WAVES OVER RANDOM TOPOGRAPHY
LONG WAVE EXPANSIONS FOR WATER WAVES OVER RANDOM TOPOGRAPHY ANNE DE BOUARD 1 , WALTER CRAIG 2 with the ran dom bottom. We show that the resulting influence of the random topography is expressed in terms of bottom topography a#ects the equations describing the limit of solutions in the long wave regime. We
Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment
James, L. Allan
Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment L. Allan James* Geography Department, University South Carolina Abstract The concept of sediment waves is reviewed and clarifications are proposed for nomenclature con- cerning vertical channel responses to large fluvial sediment fluxes over a period of a decade
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.
Rossen I. Ivanov
2007-07-12T23:59:59.000Z
The Euler's equations describe the motion of inviscid fluid. In the case of shallow water, when a perturbative asymtotic expansion of the Euler's equations is taken (to a certain order of smallness of the scale parameters), relations to certain integrable equations emerge. Some recent results concerning the use of integrable equation in modeling the motion of shallow water waves are reviewed in this contribution.
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.
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
CHARACTERIZING DANGEROUS WAVES FOR OCEAN WAVE ENERGY CONVERTER SURVIVABILITY Justin Hovland
Haller, Merrick
CHARACTERIZING DANGEROUS WAVES FOR OCEAN WAVE ENERGY CONVERTER SURVIVABILITY Justin Hovland ABSTRACT Ocean Wave Energy Converters (OWECs) operating on the water surface are subject to storms at station 139. Keywords: wave energy, survivability, breaking waves, joint distribution, OWEC INTRODUCTION
Extreme wave impinging and overtopping
Ryu, Yong Uk
2009-06-02T23:59:59.000Z
This investigates the velocity fields of a plunging breaking wave impinging on a structure through measurements in a two-dimensional wave tank. As the wave breaks and overtops the structure, so-called green water is generated. The flow becomes multi-phased...
2, 70177025, 2014 Freaque wave
NHESSD 2, 70177025, 2014 Freaque wave occurrences in 2013 P. C. Liu Title Page Abstract to the corresponding final paper in NHESS if available. Brief Communication: Freaque wave occurrences in 2013 P. C. Liu7025, 2014 Freaque wave occurrences in 2013 P. C. Liu Title Page Abstract Introduction Conclusions References
Arnold Schwarzenegger CALIFORNIA OCEAN WAVE
Arnold Schwarzenegger Governor CALIFORNIA OCEAN WAVE ENERGY ASSESSMENT Prepared For: California, State and Federal Agencies and their expectations in respect to potential wave power deployments Jim a huge amount of wave measurement data from various data sources Asfaw Beyene of the Department
Rutledge, Steven
Electromagnetic WavesElectromagnetic Waves In this chapter we will review selected properties of electromagnetic waves since radar involves the transmission, propagation and scattering of EM waves by various is the electrostatic force between two point charges. #12;Electromagnetic WavesElectromagnetic Waves Electric fields
Chiral Heat Wave and wave mixing in chiral media
Chernodub, M N
2015-01-01T23:59:59.000Z
We show that a hot rotating fluid of relativistic chiral fermions possesses a new gapless collective excitation associated with coherent propagation of energy density and chiral density waves along the axis of rotation. This excitation, which we call the Chiral Heat Wave, emerges due to a mixed gauge-gravitational anomaly. At finite density the Chiral Heat Wave couples to the Chiral Vortical Wave while in the presence of an external magnetic field it mixes with the Chiral Magnetic Wave. We find that the coupled waves - which are coherent fluctuations of the vector, axial and energy currents - have generally different velocities compared to the velocities of the individual waves. We also demonstrate that rotating chiral systems subjected to external magnetic field possess non-propagating metastable thermal excitations, the Dense Hot Spots.
Rayleigh Wave-Internal Wave Coupling and Internal Wave Generation Above a Model Jet Stream
Sutherland, Bruce
Rayleigh Wave-Internal Wave Coupling and Internal Wave Generation Above a Model Jet Stream B. R instability of the upper flank of the Jet Stream are discussed. 1 Introduction Although the most significant in the stratosphere have also been noted near the Jet Stream in the absence of topographic, convective and geostrophic
Rayleigh WaveInternal Wave Coupling and Internal Wave Generation Above a Model Jet Stream
Sutherland, Bruce
Rayleigh WaveInternal Wave Coupling and Internal Wave Generation Above a Model Jet Stream B. R instability of the upper flank of the Jet Stream are discussed. 1 Introduction Although the most significant in the stratosphere have also been noted near the Jet Stream in the absence of topographic, convective and geostrophic
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.
L. Montagnier; J. Aissa; E. Del Giudice; C. Lavallee; A. Tedeschi; G. Vitiello
2010-12-23T23:59:59.000Z
Some bacterial and viral DNA sequences have been found to induce low frequency electromagnetic waves in high aqueous dilutions. This phenomenon appears to be triggered by the ambient electromagnetic background of very low frequency. We discuss this phenomenon in the framework of quantum field theory. A scheme able to account for the observations is proposed. The reported phenomenon could allow to develop highly sensitive detection systems for chronic bacterial and viral infections.
Theoretical Physics IV SS 2007 R. Flume Exercise II
Buse, Karsten
) A rectangle in a T - S diagramm that is passed through in clockwise order is a Carnot cycle. Calculate for a reversible process. Calculate the entropy change and the optimal temperature T e for a machine which delivers) The Otto cycle consists of a clockwise rectangle in a S - V diagram. Compute for a simple ideal gas (i
Theoretical Physics IV -SS 2007 -R. Flume Exercise II
Buse, Karsten
that is passed through in clockwise order is a Carnot cycle. Calculate for a monatomic ideal gas the efficiency. The maximal work theorem says that the delivery of work is maximal for a reversible process. Calculate is S = Ns0 + NR · ln (( U U0 )c ( V V0 )( N N0 )-c-1 ) with c = 3/2. (i) The Otto cycle consists
Property:Channel/Tunnel/Flume | Open Energy Information
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DeFrees Flume 4 | Open Energy Information
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DeFrees Flume 1 | Open Energy Information
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DeFrees Flume 2 | Open Energy Information
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Water Monitoring Flume Replaced at the Rocky Flats, Colorado, Site |
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 23Tribal Energy Program GrantStateAcceptance and Land Use |in 2013 |
Using a Bore-Soliton-Splash to understand Rogue Waves, Tsunamis & Wave Energy
Wirosoetisno, Djoko
Using a Bore-Soliton-Splash to understand Rogue Waves, Tsunamis & Wave Energy Onno Bokhove, Elena it. · Explore: relation w. tsunamis, wave pumps & wave energy? 2 Set-up Water Wave Channel · Two & new experiments, in portable BSS wave tank or Roombeek channel [7]. 7 New Wave Energy Device
DeFrees Large Wave Basin | Open Energy Information
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Deep-water gravity waves: nonlinear theory of wave groups
Mindlin, I M
2014-01-01T23:59:59.000Z
Nonlinear initial-boundary value problem on deep-water gravity waves of finite amplitude is solved approximately (up to small terms of higher order) assuming that the waves are generated by an initial disturbance to the water and the horizontal dimensions of the initially disturbed body of the water are much larger than the magnitude of the free surface displacement. A numerable set of specific free surface waves is obtained in closed form and it is shown that free surface waves produced by an arbitrary initial disturbance to the water is a combination (not superposition: the waves are nonlinear) of the specific waves. A set of dispersive wave packets is found with one-to-one correspondence between the packets and positive integers, say, packet numbers, such that any initial free surface displacement gradually disintegrates into a number (limited or unlimited, depending on initial conditions) of the wave packets. The greater the packet number, the shorter the wavelength of the packet's carrier wave component,...
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.
Lipscombe, O. J. [University of Tennessee, Knoxville (UTK); Chen, G. F. [The Institute of Physics, Chinese Academy of Sciences; Fang, Chen [Purdue University; Perring, T. G. [ISIS Facility, Rutherford Appleton Laboratory; Abernathy, Douglas L [ORNL; Christianson, Andrew D [ORNL; Egami, Takeshi [ORNL; Wang, Nanlin [The Institute of Physics, Chinese Academy of Sciences; Hu, Jiangping [Purdue University and Chinese Academy of Sciences; Dai, Pengcheng [University of Tennessee, Knoxville (UTK)
2011-01-01T23:59:59.000Z
We use neutron scattering to show that spin waves in the iron chalcogenide Fe{sub 1.05}Te display novel dispersion clearly different from both the first principles density functional calculations and recent observations in the related iron pnictide CaFe{sub 2}As{sub 2}. By fitting to a Heisenberg Hamiltonian, we find that although the nearest-neighbor exchange couplings in the two systems are quite different, their next-nearest-neighbor (NNN) couplings are similar. This suggests that superconductivity in the pnictides and chalcogenides share a common magnetic origin that is intimately associated with the NNN magnetic coupling between the irons.
Frank G. Borg; Ismo Hakala; Jukka Määttälä
2007-12-24T23:59:59.000Z
We present a summary of the basic properties of the radio wave generation, propagation and reception, with a special attention to the gigahertz bandwidth region which is of interest for wireless sensor networks. We also present some measurement results which use the so-called RSSI indicator in order to track how the field strength varies with position and distance of the transceivers. We hope the paper may be useful to anyone who looks for a quick review of the fundamentals of electromagnetic theory with application to antennas.
Random wave functions and percolation
E. Bogomolny; C. Schmit
2007-08-31T23:59:59.000Z
Recently it was conjectured that nodal domains of random wave functions are adequately described by critical percolation theory. In this paper we strengthen this conjecture in two respects. First, we show that, though wave function correlations decay slowly, a careful use of Harris' criterion confirms that these correlations are unessential and nodal domains of random wave functions belong to the same universality class as non critical percolation. Second, we argue that level domains of random wave functions are described by the non-critical percolation model.
Volcanoes generate devastating waves
Lockridge, P. (National Geophysical Data Center, Boulder, CO (USA))
1988-01-01T23:59:59.000Z
Although volcanic eruptions can cause many frightening phenomena, it is often the power of the sea that causes many volcano-related deaths. This destruction comes from tsunamis (huge volcano-generated waves). Roughly one-fourth of the deaths occurring during volcanic eruptions have been the result of tsunamis. Moreover, a tsunami can transmit the volcano's energy to areas well outside the reach of the eruption itself. Some historic records are reviewed. Refined historical data are increasingly useful in predicting future events. The U.S. National Geophysical Data Center/World Data Center A for Solid Earth Geophysics has developed data bases to further tsunami research. These sets of data include marigrams (tide gage records), a wave-damage slide set, digital source data, descriptive material, and a tsunami wall map. A digital file contains information on methods of tsunami generation, location, and magnitude of generating earthquakes, tsunami size, event validity, and references. The data can be used to describe areas mot likely to generate tsunamis and the locations along shores that experience amplified effects from tsunamis.
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.
Discrete wave turbulence of rotational capillary water waves
Adrian Constantin; Elena Kartashova; Erik Wahlén
2010-05-12T23:59:59.000Z
We study the discrete wave turbulent regime of capillary water waves with constant non-zero vorticity. The explicit Hamiltonian formulation and the corresponding coupling coefficient are obtained. We also present the construction and investigation of resonance clustering. Some physical implications of the obtained results are discussed.
Wave Mechanics and the Fifth Dimension
Paul S. Wesson; James M. Overduin
2013-01-28T23:59:59.000Z
Replacing 4D Minkowski space by 5D canonical space leads to a clearer derivation of the main features of wave mechanics, including the wave function and the velocity of de Broglie waves. Recent tests of wave-particle duality could be adapted to investigate whether de Broglie waves are basically 4D or 5D in nature.
Spatial and temporal modulation of internal waves and thermohaline structure
Cole, Sylvia T
2010-01-01T23:59:59.000Z
timescale, the internal wave energy cascade that concludes2 addresses the internal wave energy cascade and its spatialto as the internal wave energy cascade. Internal waves
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
Colliding axisymmetric pp-waves
B. V. Ivanov
1997-10-21T23:59:59.000Z
An exact solution is found describing the collision of axisymmetric pp-waves with M=0. They are impulsive in character and their coordinate singularities become point curvature singularities at the boundaries of the interaction region. The solution is conformally flat. Concrete examples are given, involving an ultrarelativistic black hole against a burst of pure radiation or two colliding beam- like waves.
FAST Observations of Wave Packets
Strangeway, Robert J.
FAST Observations of Wave Packets in the AKR Source Region R. J. Strangeway, P. L. Pritchett by parallel electric field. Plasma Wave Tracker Waveforms. Types of fine structure observed. Does FAST observe. Burstiness may be a signature of the reformation of the distribution. #12;Free Energy Source for AKR FAST has
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.
Creating Wave-Focusing Materials
A. G. Ramm
2008-05-16T23:59:59.000Z
Basic ideas for creating wave-focusing materials by injecting small particles in a given material are described. The number of small particles to be injected around any point is calculated. Inverse scattering problem with fixed wavenumber and fixed incident direction of the plane acoustic wave is formulated and solved.
Impact of non-hydrostatic effects and trapped lee waves on mountain wave drag
Wirosoetisno, Djoko
Impact of non-hydrostatic effects and trapped lee waves on mountain wave drag in directionally effects and trapped lee waves on mountain wave drag in directionally sheared flow. Quarterly Journal;AcceptedArticle Impact of non-hydrostatic effects and trapped lee waves on mountain wave drag
The Effects of Wave Energy Converters on a Monochromatic Wave Climate
Fox-Kemper, Baylor
The Effects of Wave Energy Converters on a Monochromatic Wave Climate Aaron Zettler-Mann aaron in wave energy converters as a possible means of providing renewable energy, the effects of a wave energy converter in a given wave climate were studied. A dedicated wave energy propagation model was used
Application of wave generator theory to the development of a Wave Energy Converter
Wood, Stephen L.
Application of wave generator theory to the development of a Wave Energy Converter by Maila Sepri approve the attached thesis Application of wave generator theory to the development of a Wave Energy Application of wave generator theory to the development of a Wave Energy Converter by Maila Sepri Principal
Plasma wave measurements with STEREO S/WAVES: Calibration, potential model, and preliminary results
California at Berkeley, University of
Plasma wave measurements with STEREO S/WAVES: Calibration, potential model, and preliminary results] The S/WAVES experiments on the two STEREO spacecraft measure waves, both in situ plasma waves and remotely generated waves such as Type II and Type III solar bursts. A part of the experiment is aimed
Estimation of wave run-up on smooth, impermeable slopes using the wave momentum flux parameter
US Army Corps of Engineers
Estimation of wave run-up on smooth, impermeable slopes using the wave momentum flux parameter-examines existing wave run-up data for regular, irregular and solitary waves on smooth, impermeable plane slopes. A simple physical argument is used to derive a new wave run-up equation in terms of a dimensionless wave
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.
Microstructural Design for Stress Wave Energy Management /
Tehranian, Aref
2013-01-01T23:59:59.000Z
Nasser, S. , 2010. Stress-wave energy management throughNemat-Nasser, Stress-wave energy management through materialS. , 2009. Acoustic wave-energy management in composite
Scholte waves generated by seafloor topography
Zheng, Yingcai
2012-01-01T23:59:59.000Z
Seafloor topography can excite strong interface waves called Scholte waves that are often dispersive and characterized by slow propagation but large amplitude. This type of wave can be used to invert for near seafloor shear ...
Microstructural Design for Stress Wave Energy Management /
Tehranian, Aref
2013-01-01T23:59:59.000Z
mode of pressure wave and energy transfer into shearmode of pressure wave and energy transfer into shear mode ItNemat-Nasser, Stress-wave energy management through material
Electrostatic-plasma-wave energy flux
Amendt, P.; Rostoker, N.
1984-01-01T23:59:59.000Z
would reduce cross- field wave-energy convection since theor cross-field leakage of wave energy are ap- that thecomposition of electrostatic-wave-energy field degrees of
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...
Walking Wave as a Model of Particle
A. V. Goryunov
2012-05-02T23:59:59.000Z
The concept of walking wave is introduced from classical relativistic positions. One- and three-dimensional walking waves considered with their wave equations and dispersion equations. It is shown that wave characteristics (de Broglie's and Compton's wavelengths) and corpuscular characteristics (energy-momentum vector and the rest mass) of particle may be expressed through parameters of walking wave. By that the new view on a number concepts of physic related with wave-particle duality is suggested.
Sandia National Laboratories: Wave Energy Resource Characterization...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
eECEnergyComputational Modeling & SimulationWave Energy Resource Characterization at US Test Sites Wave Energy Resource Characterization at US Test Sites Sandia Report Presents...
Wave Energy Resource Analysis for Use in Wave Energy Conversion
Pastor, J.; Liu, Y.; Dou, Y.
2014-01-01T23:59:59.000Z
the naturally available and technically recoverable resource in a given location. The methodology was developed by the EPRI and uses a modified Gamma spectrum that interoperates hindcast sea state parameter data produced by NOAA's Wave watch III. This Gamma...
Backreacting p-wave Superconductors
Raúl E. Arias; Ignacio Salazar Landea
2013-01-28T23:59:59.000Z
We study the gravitational backreaction of the non-abelian gauge field on the gravity dual to a 2+1 p-wave superconductor. We observe that as in the $p+ip$ system a second order phase transition exists between a superconducting and a normal state. Moreover, we conclude that, below the phase transition temperature $T_c$ the lowest free energy is achieved by the p-wave solution. In order to probe the solution, we compute the holographic entanglement entropy. For both $p$ and $p+ip$ systems the entanglement entropy satisfies an area law. For any given entangling surface, the p-wave superconductor has lower entanglement entropy.
Recirculation in multiple wave conversions
Brizard, A. J. [Department of Chemistry and Physics, Saint Michael's College, Colchester, Vermont 05439 (United States); Kaufman, A. N. [Department of Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States); Tracy, E. R. [Department of Physics, College of William and Mary, Williamsburg, Virginia 23187-8795 (United States)
2008-08-15T23:59:59.000Z
A one-dimensional multiple wave-conversion model is constructed that allows energy recirculation in ray phase space. Using a modular eikonal approach, the connection coefficients for this model are calculated by ray phase-space methods. Analytical results (confirmed numerically) show that all connection coefficients exhibit interference effects that depend on an interference phase, calculated from the coupling constants and the area enclosed by the intersecting rays. This conceptual model, which focuses on the topology of intersecting rays in phase space, is used to investigate how mode conversion between primary and secondary waves is modified by the presence of a tertiary wave.
Geometric phases of water waves
Francesco Fedele
2014-08-08T23:59:59.000Z
Recently, Banner et al. (2014) highlighted a new fundamental property of open ocean wave groups, the so-called crest slowdown. For linear narrowband waves, this is related to the geometric and dynamical phase velocities $U_d$ and $U_g$ associated with the parallel transport through the principal fiber bundle of the wave motion with $\\mathit{U}(1)$ symmetry. The theoretical predictions are shown to be in fair agreement with ocean field observations, from which the average crest speed $c=U_d+U_g$ with $c/U_d\\approx0.8$ and $U_{g}/U_d\\approx-0.2$.
Plasma waves driven by gravitational waves in an expanding universe
D. B. Papadopoulos
2002-05-22T23:59:59.000Z
In a Friedmann-Robertson-Walker (FRW) cosmological model with zero spatial curvature, we consider the interaction of the gravitational waves with the plasma in the presence of a weak magnetic field. Using the relativistic hydromagnetic equations it is verified that large amplitude magnetosonic waves are excited, assuming that both, the gravitational field and the weak magnetic field do not break the homogeneity and isotropy of the considered FRW spacetime.
Resonance Van Hove Singularities in Wave Kinetics
Shi, Yi-Kang
2015-01-01T23:59:59.000Z
Wave kinetic theory has been developed to describe the statistical dynamics of weakly nonlinear, dispersive waves. However, we show that systems which are generally dispersive can have resonant sets of wave modes with identical group velocities, leading to a local breakdown of dispersivity. This shows up as a geometric singularity of the resonant manifold and possibly as an infinite phase measure in the collision integral. Such singularities occur widely for classical wave systems, including acoustical waves, Rossby waves, helical waves in rotating fluids, light waves in nonlinear optics and also in quantum transport, e.g. kinetics of electron-hole excitations (matter waves) in graphene. These singularities are the exact analogue of the critical points found by Van Hove in 1953 for phonon dispersion relations in crystals. The importance of these singularities in wave kinetics depends on the dimension of phase space $D=(N-2)d$ ($d$ physical space dimension, $N$ the number of waves in resonance) and the degree ...
The parametric decay of Alfven waves into shear Alfven waves and dust lower hybrid waves
Jamil, M. [Department of Physics, Government College University, Lahore 54000 (Pakistan); Department of Physics, Crescent Model School Shadman, Lahore 54000 (Pakistan); Shah, H. A.; Zubia, K.; Zeba, I.; Uzma, Ch. [Department of Physics, Government College University, Lahore 54000 (Pakistan); Salimullah, M. [Department of Physics, Government College University, Lahore 54000 (Pakistan); Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh)
2010-07-15T23:59:59.000Z
The parametric decay instability of Alfven wave into low-frequency electrostatic dust-lower-hybrid and electromagnetic shear Alfven waves has been investigated in detail in a dusty plasma in the presence of external/ambient uniform magnetic field. Magnetohydrodynamic fluid equations of plasmas have been employed to find the linear and nonlinear response of the plasma particles for this three-wave nonlinear coupling in a dusty magnetoplasma. Here, relatively high frequency electromagnetic Alfven wave has been taken as the pump wave. It couples with other two low-frequency internal possible modes of the dusty magnetoplasma, viz., the dust-lower-hybrid and shear Alfven waves. The nonlinear dispersion relation of the dust-lower-hybrid wave has been solved to obtain the growth rate of the parametric decay instability. The growth rate is maximum for small value of external magnetic field B{sub s}. It is noticed that the growth rate is proportional to the unperturbed electron number density n{sub oe}.
Michael Spillane; Alexander Stoffers; Ismail Zahed
2011-10-23T23:59:59.000Z
We study the propagation of an ultrarelativistic light quark jet inside a shock wave using the holographic principle. The maximum stopping distance and its dependency on the energy of the jet is obtained.
Gravitational waves: a foundational review
J. G. Pereira
2015-05-27T23:59:59.000Z
The standard linear approach to the gravitational waves theory is critically reviewed. Contrary to the prevalent understanding, it is pointed out that this theory contains many conceptual and technical obscure issues that require further analysis.
Wave Energy Extraction from buoys
Garnaud, Xavier
2009-01-01T23:59:59.000Z
Different types of Wave Energy Converters currently tested or under development are using the vertical movement of floating bodies to generate electricity. For commercial applications, arrays have to be considered in order ...
Rhinefrank, Kenneth E. [Columbia Power Technologies, Inc.; Lenee-Bluhm, Pukha [Columbia Power Technologies, Inc.; Prudell, Joseph H. [Columbia Power Technologies, Inc.; Schacher, Alphonse A. [Columbia Power Technologies, Inc.; Hammagren, Erik J. [Columbia Power Technologies, Inc.; Zhang, Zhe [Columbia Power Technologies, Inc.
2013-07-29T23:59:59.000Z
The most prudent path to a full-scale design, build and deployment of a wave energy conversion (WEC) system involves establishment of validated numerical models using physical experiments in a methodical scaling program. This Project provides essential additional rounds of wave tank testing at 1:33 scale and ocean/bay testing at a 1:7 scale, necessary to validate numerical modeling that is essential to a utility-scale WEC design and associated certification.
Brian J. Smith; M. G. Raymer
2007-02-21T23:59:59.000Z
The position-representation wave function for multi-photon states and its equation of motion are introduced. A major strength of the theory is that it describes the complete evolution (including polarization and entanglement) of multi-photon states propagating through inhomogeneous media. As a demonstration of the two-photon wave function's use, we show how two photons in an orbital-angular-momentum entangled state decohere upon propagation through a turbulent atmosphere.
Wave Evolution On the Evolution of Curvelets
Smith, Hart F.
Curvelets Wave Evolution On the Evolution of Curvelets by the Wave Equation Hart F. Smith Department of Mathematics University of Washington, Seattle 1st PRIMA Congress Hart F. Smith On the Evolution of Curvelets by the Wave Equation #12;Curvelets Wave Evolution Curvelets and the Second Dyadic Decomposition
Steady water waves with multiple critical layers
Mats Ehrnström; Joachim Escher; Erik Wahlén
2011-04-01T23:59:59.000Z
We construct small-amplitude periodic water waves with multiple critical layers. In addition to waves with arbitrarily many critical layers and a single crest in each period, two-dimensional sets of waves with several crests and troughs in each period are found. The setting is that of steady two-dimensional finite-depth gravity water waves with vorticity.
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.
Ramos Heredia, Rafael Juda
1995-01-01T23:59:59.000Z
methodology for wave kinematics prediction. While the methods commonly used by the offshore industry are empirical and semi-empirical modifications of Linear (random) Wave Theory, the new approach (Hybrid Wave Model) satisfies the principles of hydrodynamics...
Wave-Turbulence Interactions in a Breaking Mountain Wave Craig Epifanio and Tingting Qian
#12;Dissipation of Mean Wave Energy · Mean wave energy E is just the total energy (kinetic + available · The dissipation of mean wave energy is caused by the turbulent momentum fluxes--specifically, by their tendency
Energy-momentum relation for solitary waves of relativistic wave equations
T. V. Dudnikova; A. I. Komech; H. Spohn
2005-08-23T23:59:59.000Z
Solitary waves of relativistic invariant nonlinear wave equation with symmetry group U(1) are considered. We prove that the energy-momentum relation for spherically symmetric solitary waves coincides with the Einstein energy-momentum relation for point particles.
Surface wave chemical detector using optical radiation
Thundat, Thomas G.; Warmack, Robert J.
2007-07-17T23:59:59.000Z
A surface wave chemical detector comprising at least one surface wave substrate, each of said substrates having a surface wave and at least one measurable surface wave parameter; means for exposing said surface wave substrate to an unknown sample of at least one chemical to be analyzed, said substrate adsorbing said at least one chemical to be sensed if present in said sample; a source of radiation for radiating said surface wave substrate with different wavelengths of said radiation, said surface wave parameter being changed by said adsorbing; and means for recording signals representative of said surface wave parameter of each of said surface wave substrates responsive to said radiation of said different wavelengths, measurable changes of said parameter due to adsorbing said chemical defining a unique signature of a detected chemical.
US Army Corps of Engineers
B8 Page 1 B8. Using CMS-Wave The most recent CMS-Wave code developed is Version 3.2. Several new capabilities and advanced features in this version include: · Full-plane wind-generation of waves · Automatic wave run-up calculation · Infra-gravity wave calculation · Nonlinear wave-wave interaction · Muddy
Wave propagation in complex coordinates
Horsley, S A R; Philbin, T G
2015-01-01T23:59:59.000Z
We investigate the analytic continuation of wave equations into the complex position plane. For the particular case of electromagnetic waves we provide a physical meaning for such an analytic continuation in terms of a family of closely related inhomogeneous media. For bounded permittivity profiles we find the phenomenon of reflection can be related to branch cuts in the wave that originate from poles of the permittivity at complex positions. Demanding that these branch cuts disappear, we derive a large family of inhomogeneous media that are reflectionless for a single angle of incidence. Extending this property to all angles of incidence leads us to a generalized form of the Poschl Teller potentials. We conclude by analyzing our findings within the phase integral (WKB) method.
Wave propagation in anisotropic viscoelasticity
Andrzej Hanyga
2015-04-30T23:59:59.000Z
We extend the theory of complete Bernstein functions to matrix-valued functions and apply it to analyze Green's function of an anisotropic multi-dimension\\-al linear viscoelastic problem. Green's function is given by the superposition of plane waves. Each plane wave is expressed in terms of matrix-valued attenuation and dispersion functions given in terms of a matrix-valued positive semi-definite Radon measure. More explicit formulae are obtained for 3D isotropic viscoelastic Green's functions. As an example of an anisotropic medium the transversely isotropic medium with a constant symmetry axis is considered.
Identifying two steps in the internal wave energy cascade
Sun, Oliver Ming-Teh
2010-01-01T23:59:59.000Z
1.1.1 The internal wave energy cascade . . . . . . .? ? , which contain only wave energy trav- eling upward anddistinction is made between wave energy propagating upward
Sandia Energy - WEC-Sim (Wave Energy Converter SIMulator)
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
WEC-Sim (Wave Energy Converter SIMulator) Home Stationary Power Energy Conversion Efficiency Water Power WEC-Sim (Wave Energy Converter SIMulator) WEC-Sim (Wave Energy Converter...
Stress Wave Source Characterization: Impact, Fracture, and Sliding Friction
McLaskey, Gregory Christofer
2011-01-01T23:59:59.000Z
717-725. Graff, K. (1975). Wave Motion in Elastic Solids (and deterioration on stress wave velocities in concrete,Greenspan, M. (1981) Surface-wave displacement: absolute
MHK Technologies/New Knowledge Wind and Wave Renewable Mobile...
Wind and Wave Renewable Mobile Wind and Wave Power Plant Platform.jpg Technology Profile Primary Organization Darrel Dammen Technology Resource Click here Wave Technology...
Texas at Austin, University of
(fast and slow) with differing polarization. The 4C, 3D ocean-bottom cable (OBC) multicomponent seismic and stratigraphic features within the gas-charged intervals. C- waves (Figure 3) penetrate these P-wave wipeout
Long wave expansions for water waves over random topography
Anne de Bouard; Walter Craig; Oliver Díaz-Espinosa; Philippe Guyenne; Catherine Sulem
2007-10-01T23:59:59.000Z
In this paper, we study the motion of the free surface of a body of fluid over a variable bottom, in a long wave asymptotic regime. We assume that the bottom of the fluid region can be described by a stationary random process $\\beta(x, \\omega)$ whose variations take place on short length scales and which are decorrelated on the length scale of the long waves. This is a question of homogenization theory in the scaling regime for the Boussinesq and KdV equations. The analysis is performed from the point of view of perturbation theory for Hamiltonian PDEs with a small parameter, in the context of which we perform a careful analysis of the distributional convergence of stationary mixing random processes. We show in particular that the problem does not fully homogenize, and that the random effects are as important as dispersive and nonlinear phenomena in the scaling regime that is studied. Our principal result is the derivation of effective equations for surface water waves in the long wave small amplitude regime, and a consistency analysis of these equations, which are not necessarily Hamiltonian PDEs. In this analysis we compute the effects of random modulation of solutions, and give an explicit expression for the scattered component of the solution due to waves interacting with the random bottom. We show that the resulting influence of the random topography is expressed in terms of a canonical process, which is equivalent to a white noise through Donsker's invariance principle, with one free parameter being the variance of the random process $\\beta$. This work is a reappraisal of the paper by Rosales & Papanicolaou \\cite{RP83} and its extension to general stationary mixing processes.
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
Einstein, Black Holes Gravitational Waves
Cook, Greg
1 #12;Einstein, Black Holes and Gravitational Waves Gregory B. Cook Wake Forest University 2 #12;Einstein's Miraculous Year: 1905 · Einstein, A. "¨Uber einen die Erzeugung und Verwandlung des Lichtes Concerning the Production and Transformation of Light. · Einstein, A. "¨Uber die von der molekularkinetischen
Wave functions of linear systems
Tomasz Sowinski
2007-06-05T23:59:59.000Z
Complete analysis of quantum wave functions of linear systems in an arbitrary number of dimensions is given. It is shown how one can construct a complete set of stationary quantum states of an arbitrary linear system from purely classical arguments. This construction is possible because for linear systems classical dynamics carries the whole information about quantum dynamics.
Karney, Charles
. INTRODUCTIO In typical lower hybrid heating schemes, lower hybrid waves are launched at the wall sf tokamak. In this paper we study the C numerically, and determine the consequences of our results for lower hybrid heating hybrid heating of a tokamak. 11. THE CMKDV EQUAT The two-dimensional steady-state propagation of a single
Variational Principles for Water Waves
Boris Kolev; David H. Sattinger
2007-12-01T23:59:59.000Z
We describe the Hamiltonian structures, including the Poisson brackets and Hamiltonians, for free boundary problems for incompressible fluid flows with vorticity. The Hamiltonian structure is used to obtain variational principles for stationary gravity waves both for irrotational flows as well as flows with vorticity.
WAVE-ENERGY DENSITY AND WAVE-MOMENTUM DENSITY OF EACH SPECIES OF A COLLISION-LESS PLASMA
Cary, John R.
2012-01-01T23:59:59.000Z
case, the electrons have negative wave energy for 2w ne w wave energy for 2w .w > 0 nl Hence, unstable waves with negative phase velocity,
Oblique reflections of internal gravity wave beams
Karimi, Hussain H. (Hussain Habibullah)
2012-01-01T23:59:59.000Z
We study nonlinear effects in reflections of internal gravity wave beams in a continuously stratified liquid which are incident upon a uniform slope at an oblique angle. Wave motion in a stratified fluid medium is unique ...
Turbulent round jet under gravity waves
Ryu, Yong Uk
2002-01-01T23:59:59.000Z
The behavior of a neutrally buoyant horizontal turbulent round jet under a wavy environment was investigated. Progressive waves with different wave amplitudes in an intermediate water depth were used. The Particle Image Velocimetry (PIV) technique...
Grading of lumber using stress waves
Bethi, Rajeshwar
1994-01-01T23:59:59.000Z
the statistical correlation between localized stress wave indices and lumber tensile strength and 3) compare the ultrasonic technique with other nondestructive evaluation (NDE) measurements including static MOE, impact stress wave and transverse vibration. Two...
Fracture compliance estimation using borehole tube waves
Bakku, Sudhish Kumar
We tested two models, one for tube-wave generation and the other for tube-wave attenuation at a fracture intersecting a borehole that can be used to estimate fracture compliance, fracture aperture, and lateral extent. In ...
Gravitational waves from merging compact binaries
Hughes, Scott A.
Largely motivated by the development of highly sensitive gravitational-wave detectors, our understanding of merging compact binaries and the gravitational waves they generate has improved dramatically in recent years. ...
Arnold Schwarzenegger DEVELOPING WAVE ENERGY IN
Arnold Schwarzenegger Governor DEVELOPING WAVE ENERGY IN COASTAL CALIFORNIA: POTENTIAL SOCIO. Developing Wave Energy In Coastal California: Potential Socio-Economic And Environmental Effects. California-ECONOMIC AND ENVIRONMENTAL EFFECTS Prepared For: California Energy Commission Public Interest Energy Research Program
Mathematical aspects of surface water waves
Craig, Walter
questions remain. These have to do with the evolution of surface water waves, their approximation by model normally being chosen. Unless we are describing waves of a global extent, such as a tsunami, for our
Carbon nanotube-guided thermopower waves
Choi, Wonjoon
Thermopower waves are a new concept for the direct conversion of chemical to electrical energy. A nanowire with large axial thermal diffusivity can accelerate a self-propagating reaction wave using a fuel coated along its ...
Analysis of optimum Lamb wave tuning
Shi, Yijun, 1970-
2002-01-01T23:59:59.000Z
Guided waves are of enormous interest in the nondestructive evaluation of thin-walled structures and layered media. Due to their dispersive and multi-modal nature, it is desirable to tune the waves by discriminating one ...
Wind effects on shoaling wave shape
Feddersen, F; Veron, F
2005-01-01T23:59:59.000Z
breaking in the presence of wind drift and swell. J. Fluidlin, 1995: Asymmetry of wind waves studied in a laboratorycoupling between swell and wind-waves. J. Phys. Oceanogr. ,
Wave radiation in simple geophysical models
Murray, Stuart William
2013-07-01T23:59:59.000Z
Wave radiation is an important process in many geophysical flows. In particular, it is by wave radiation that flows may adjust to a state for which the dynamics is slow. Such a state is described as “balanced”, meaning ...
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.
An electromagnetic analog of gravitational wave memory
Lydia Bieri; David Garfinkle
2013-09-10T23:59:59.000Z
We present an electromagnetic analog of gravitational wave memory. That is, we consider what change has occurred to a detector of electromagnetic radiation after the wave has passed. Rather than a distortion in the detector, as occurs in the gravitational wave case, we find a residual velocity (a "kick") to the charges in the detector. In analogy with the two types of gravitational wave memory ("ordinary" and "nonlinear") we find two types of electromagnetic kick.
Wave Propagation in Fractured Poroelastic Media
Seismic wave propagation through fractures and cracks is an important subject in exploration and production geophysics, earthquake seismology and mining.
Wave-driven Countercurrent Plasma Centrifuge
A.J. Fetterman and N.J. Fisch
2009-03-20T23:59:59.000Z
A method for driving rotation and a countercurrent flow in a fully ionized plasma centrifuge is described. The rotation is produced by radiofrequency waves near the cyclotron resonance. The wave energy is transferred into potential energy in a manner similar to the ? channeling effect. The countercurrent flow may also be driven by radiofrequency waves. By driving both the rotation and the flow pattern using waves instead of electrodes, physical and engineering issues may be avoided.
Seminario de Matemtica Aplicada "Renowable wave energy
Tradacete, Pedro
Seminario de Matemática Aplicada "Renowable wave energy: potencial and technical challenges Abstract: Among the various renewable energy sources, ocean wave energy has been only recently investiga will be at first to introduce the potential of wave energy, as a significant, and often neglected, contributor
Wave Propagation in Fractured Poroelastic Media
Santos, Juan
Wave Propagation in Fractured Poroelastic Media WCCM, MS170: Advanced Computational Techniques and natural or artificial hydraulic fracturing caused by a pressurized fluid. Seismic wave propagation through. Martinez Corredor (UNLP). Wave Propagation in Fractured Poroelastic Media p. #12;Fractured media. I
EFFICIENCY OF FAST WAVE CURRENT DRIVE FOR
Karney, Charles
EFFICIENCY OF FAST WAVE CURRENT DRIVE FOR A WEAKLY RELATIVISTIC PLASMA by S.C. CHIU, C.F.F. KARNEY: http://charles.karney.info/biblio/chiu94.html #12;Chiu e t al. THE EFFICIENCY OF FAST WAVE CURRENT DRIVE FOR A WEAKLY RELATIVISTIC PLASMA THE EFFICIENCY OF FAST WAVE CURRENT DRIVE FOR A WEAKLY
Multi-reflective acoustic wave device
Andle, Jeffrey C.
2006-02-21T23:59:59.000Z
An acoustic wave device, which utilizes multiple localized reflections of acoustic wave for achieving an infinite impulse response while maintaining high tolerance for dampening effects, is disclosed. The device utilized a plurality of electromechanically significant electrodes disposed on most of the active surface. A plurality of sensors utilizing the disclosed acoustic wave mode device are also described.
Wave Packets and Turbulent Peter Jordan1
Dabiri, John O.
Wave Packets and Turbulent Jet Noise Peter Jordan1 and Tim Colonius2 1 D´epartement Fluides-control efforts is incomplete. Wave packets are intermittent, advecting disturbances that are correlated over review evidence of the existence, energetics, dynamics, and acous- tic efficiency of wave packets. We
Wave guides: vacuum w/ tube of conductor
Hart, Gus
Wave guides: vacuum w/ tube of conductor boundary conditions for conductor Properties: non-transverse waves except TEM mode in coaxial cable speed normal modes (from Liouville problem) TE or TM TEM for coaxial cable cuto frequency otherwise evanescent waves separation into and components with 1 #12;B
WAVE GENERATIONS FROM CONFINED EXPLOSIONS IN ROCKS
Stewart, Sarah T.
WAVE GENERATIONS FROM CONFINED EXPLOSIONS IN ROCKS C. L. Liu and Thomas J. Ahrens Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125 In order to record P- and S-waves on the interactions between incident P- and SV-waves and free-surfaces of rocks. The relations between particle
Four-wave mixing microscopy of nanostructures
Potma, Eric Olaf
Four-wave mixing microscopy of nanostructures Yong Wang, Chia-Yu Lin, Alexei Nikolaenko, Varun July 14, 2010; accepted July 27, 2010; published September 10, 2010 (Doc. ID 128079) The basics of four-wave. Four-Wave Mixing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2
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
Measurement of sound speed vs. depth in South Pole ice: pressure waves and shear waves
Klein, Spencer
2010-01-01T23:59:59.000Z
waves generated by the thermoacoustic mechanism, little workproduction by the thermoacoustic mechanism is suppressed,
Wave Turbulence in Superfluid 4 Energy Cascades, Rogue Waves & Kinetic Phenomena
Fominov, Yakov
Outline Wave Turbulence in Superfluid 4 He: Energy Cascades, Rogue Waves & Kinetic Phenomena Conference, Chernogolovka, 3 August 2009 McClintock Efimov Ganshin Kolmakov Mezhov-Deglin Wave Turbulence in Superfluid 4 He #12;Outline Outline 1 Introduction Motivation 2 Modelling wave turbulence Need for models
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
One-way wave-equation migration of compressional and converted waves in a VTI medium
Ursin, Bjørn
One-way wave-equation migration of compressional and converted waves in a VTI medium Ørjan Pedersen- sure and shear-wave reflections, one can increase the amount of information obtained about the subsur- face than by recording pressure waves alone. Geo- logic structures which are not visible by using con
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
Full-wave Electromagnetic Field Simulations of Lower Hybrid Waves in Tokamaks
Wright, John C.
Full-wave Electromagnetic Field Simulations of Lower Hybrid Waves in Tokamaks J. C. Wright , P. T, VA, USA Abstract. The most common method for treating wave propagation in tokamaks in the lower of 2D and 3D plasma inhomogeneity effects on wave propagation, the approach neglects important effects
2013 MLML Wave Award Deadline: February 8, 2013 The 2013 MLML Wave Award
McPhee-Shaw, Erika
2013 MLML Wave Award Deadline: February 8, 2013 The 2013 MLML Wave Award Sponsored by the MLML Associated Student Body Application Deadline: Friday, February 8, 2013 The Friends of MLML is pleased to announce the 2013 MLML Wave Award. The 2013 MLML Wave Award is sponsored
Title of Document: STUDIES OF HIGH FREQUENCY WAVE EXCITATION IN FAST AND SLOW WAVE
Anlage, Steven
ABSTRACT Title of Document: STUDIES OF HIGH FREQUENCY WAVE EXCITATION IN FAST AND SLOW WAVE VACUUM of Electrical and Computer Engineering and Department of Physics THz and millimeter-wave length radiation are considered: the reduction in bunching efficiency in orotrons (a slow wave device), and the excitation
Wave Front Interaction Model of Stabilized Propagating Wave Segments Vladimir S. Zykov1
Showalter, Kenneth
Wave Front Interaction Model of Stabilized Propagating Wave Segments Vladimir S. Zykov1 and Kenneth; published 14 February 2005) A wave front interaction model is developed to describe the relationship between excitability and the size and shape of stabilized wave segments in a broad class of weakly excitable media
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.
Airborne observations of the kinematics and statistics of breaking waves
Kleiss, Jessica M.
2009-01-01T23:59:59.000Z
E. M. Janssen, 1996: Wave energy dissipation by whitecaps.waves: Surface impulse and wave energy dissipation rates. J.to the ocean, dissipating wave energy that is then available
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.
Resonance Van Hove Singularities in Wave Kinetics
Yi-Kang Shi; Gregory Eyink
2015-07-29T23:59:59.000Z
Wave kinetic theory has been developed to describe the statistical dynamics of weakly nonlinear, dispersive waves. However, we show that systems which are generally dispersive can have resonant sets of wave modes with identical group velocities, leading to a local breakdown of dispersivity. This shows up as a geometric singularity of the resonant manifold and possibly as an infinite phase measure in the collision integral. Such singularities occur widely for classical wave systems, including acoustical waves, Rossby waves, helical waves in rotating fluids, light waves in nonlinear optics and also in quantum transport, e.g. kinetics of electron-hole excitations (matter waves) in graphene. These singularities are the exact analogue of the critical points found by Van Hove in 1953 for phonon dispersion relations in crystals. The importance of these singularities in wave kinetics depends on the dimension of phase space $D=(N-2)d$ ($d$ physical space dimension, $N$ the number of waves in resonance) and the degree of degeneracy $\\delta$ of the critical points. Following Van Hove, we show that non-degenerate singularities lead to finite phase measures for $D>2$ but produce divergences when $D\\leq 2$ and possible breakdown of wave kinetics if the collision integral itself becomes too large (or even infinite). Similar divergences and possible breakdown can occur for degenerate singularities, when $D-\\delta\\leq 2,$ as we find for several physical examples, including electron-hole kinetics in graphene. When the standard kinetic equation breaks down, then one must develop a new singular wave kinetics. We discuss approaches from pioneering 1971 work of Newell \\& Aucoin on multi-scale perturbation theory for acoustic waves and field-theoretic methods based on exact Schwinger-Dyson integral equations for the wave dynamics.
Damage Detection in Plate Structures using Guided Ultrasonic Waves
Jarmer, Gregory James Sylvester
Guided Wave Structural Health Monitoring. ” Ultrasonics 50 (to Structural Health Monitoring. ” Philosophicalfor Guided-wave Structural Health Monitoring. ” Structural
Construction of KP solitons from wave patterns
Sarbarish Chakravarty; Yuji Kodama
2013-09-10T23:59:59.000Z
We often observe that waves on the surface of shallow water form complex web-like patterns. They are examples of nonlinear waves, and these patterns are generated by nonlinear interactions among several obliquely propagating waves. In this note, we discuss how to construct an exact soliton solution of the KP equation from such web-pattern of shallow water wave. This can be regarded as an "inverse problem" in the sense that by measuring certain metric data of the solitary waves in the given pattern, it is possible to construct an exact KP soliton solution which can describe the non-stationary dynamics of the pattern.
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.
Refractive gravitational waves and quantum fluctuations
John W. Barrett
2000-11-14T23:59:59.000Z
Refractive gravitational waves are a generalisation of impulsive waves on a null hypersurface in which the metric is discontinuous but a weaker continuity condition for areas holds. A simple example of a plane wave is examined in detail and two arguments are given that this should be considered a solution of Einstein's vacuum field equations. The study of these waves is motivated by quantum gravity, where the refractive plane waves are considered as elementary quantum fluctuations and the `area geometry' of a null hypersurface plays a primary role.
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.
Majidi-Ahy, Gholamreza (Sunnyvale, CA); Bloom, David M. (Portola Valley, CA)
1991-01-01T23:59:59.000Z
A millimeter-wave active probe for use in injecting signals with frequencies above 50GHz to millimeter-wave and ultrafast devices and integrated circuits including a substrate upon which a frequency multiplier consisting of filter sections and impedance matching sections are fabricated in uniplanar transmission line format. A coaxial input and uniplanar 50 ohm transmission line couple an approximately 20 GHz input signal to a low pass filter which rolls off at approximately 25 GHz. An input impedance matching section couples the energy from the low pass filter to a pair of matched, antiparallel beam lead diodes. These diodes generate odd-numberd harmonics which are coupled out of the diodes by an output impedance matching network and bandpass filter which suppresses the fundamental and third harmonics and selects the fifth harmonic for presentation at an output.
Gravitational waves from perturbed stars
Valeria Ferrari
2011-05-09T23:59:59.000Z
Non radial oscillations of neutron stars are associated with the emission of gravitational waves. The characteristic frequencies of these oscillations can be computed using the theory of stellar perturbations, and they are shown to carry detailed information on the internal structure of the emitting source. Moreover, they appear to be encoded in various radiative processes, as for instance in the tail of the giant flares of Soft Gamma Repeaters. Thus, their determination is central to the theory of stellar perturbation. A viable approach to the problem consists in formulating this theory as a problem of resonant scattering of gravitational waves incident on the potential barrier generated by the spacetime curvature. This approach discloses some unexpected correspondences between the theory of stellar perturbations and the theory of quantum mechanics, and allows us to predict new relativistic effects.
Reconstruction of nonlinear wave propagation
Fleischer, Jason W; Barsi, Christopher; Wan, Wenjie
2013-04-23T23:59:59.000Z
Disclosed are systems and methods for characterizing a nonlinear propagation environment by numerically propagating a measured output waveform resulting from a known input waveform. The numerical propagation reconstructs the input waveform, and in the process, the nonlinear environment is characterized. In certain embodiments, knowledge of the characterized nonlinear environment facilitates determination of an unknown input based on a measured output. Similarly, knowledge of the characterized nonlinear environment also facilitates formation of a desired output based on a configurable input. In both situations, the input thus characterized and the output thus obtained include features that would normally be lost in linear propagations. Such features can include evanescent waves and peripheral waves, such that an image thus obtained are inherently wide-angle, farfield form of microscopy.
Swyden, Courtney
2006-01-01T23:59:59.000Z
The Wave of the Future Story by Courtney Swyden THEWAVE OF THE FUTURE tx H2O | pg. 2 Plans use local involvement to enhance water quality Comprehensive watershed protection plans,outlining ways to preserve or restore water-sheds, are becoming a... popular approach for protecting Texas surface waters. The Texas Water Resources Institute (TWRI), Texas Agricultural Experiment Station and Texas Cooperative Extension are taking an active role in providing assessment, educational outreach, manage...
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.
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.
Laminated Wave Turbulence: Generic Algorithms I
E. Kartashova; A. Kartashov
2006-09-07T23:59:59.000Z
The model of laminated wave turbulence presented recently unites both types of turbulent wave systems - statistical wave turbulence (introduced by Kolmogorov and brought to the present form by numerous works of Zakharov and his scientific school since nineteen sixties) and discrete wave turbulence (developed in the works of Kartashova in nineteen nineties). The main new feature described by this model is the following: discrete effects do appear not only in the long-wave part of the spectral domain (corresponding to small wave numbers) but all through the spectra thus putting forth a novel problem - construction of fast algorithms for computations in integers of order $10^{12}$ and more. In this paper we present a generic algorithm for polynomial dispersion functions and illustrate it by application to gravity and planetary waves.
Wave Power Resources off the Hawaiian Islands luisvega@hawaii.edu 1 Wave Resources3 Licensing and Permitting p3 Challenges and Barriers p4 Wave Power Resources: Previous Work p5 Wave Farms: Siting, Ocean Area Requirements p7 Offshore Wave Power Resources: Update p9 Shallow Water Wave
Victoria, University of
On the Use of Computational Models for Wave Climate Assessment in Support of the Wave Energy On the Use of Computational Models for Wave Climate Assessment in Support of the Wave Energy Industry Effective, economic extraction of ocean wave energy requires an intimate under- standing of the ocean wave
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 of5, 2014 |andWater Water EERE plays a key roleFebruary1 Summer 2001 Heat
The Loudest Gravitational Wave Events
Hsin-Yu Chen; Daniel E. Holz
2014-09-04T23:59:59.000Z
As first emphasized by Bernard Schutz, there exists a universal distribution of signal-to-noise ratios for gravitational wave detection. Because gravitational waves (GWs) are almost impossible to obscure via dust absorption or other astrophysical processes, the strength of the detected signal is dictated solely by the emission strength and the distance to the source. Assuming that the space density of an arbitrary population of GW sources does not evolve, we show explicitly that the distribution of detected signal-to-noise (SNR) values depends solely on the detection threshold; it is independent of the detector network (interferometer or pulsar timing array), the individual detector noise curves (initial or Advanced LIGO), the nature of the GW sources (compact binary coalescence, supernova, or some other discrete source), and the distributions of source variables (only non-spinning neutron stars of mass exactly $1.4\\,M_\\odot$ or a complicated distribution of masses and spins). We derive the SNR distribution for each individual detector within a network as a function of the relative detector orientations and sensitivities. While most detections will have SNR near the detection threshold, there will be a tail of events to higher SNR. We derive the SNR distribution of the loudest (highest SNR) events in any given sample of detections. We find that the median SNR of the loudest out of the first four events should have an $\\mbox{SNR}=22$ (for a threshold of 12, appropriate for the Advanced LIGO/Virgo network), increasing to a median value for the loudest SNR of 47 for 40 detections. We expect these loudest events to provide particularly powerful constraints on their source parameters, and they will play an important role in extracting astrophysics from gravitational wave sources. These distributions also offer an important internal calibration of the response of the GW detector networks.
Modeling water waves beyond perturbations
Clamond, Didier
2015-01-01T23:59:59.000Z
In this chapter, we illustrate the advantage of variational principles for modeling water waves from an elementary practical viewpoint. The method is based on a `relaxed' variational principle, i.e., on a Lagrangian involving as many variables as possible, and imposing some suitable subordinate constraints. This approach allows the construction of approximations without necessarily relying on a small parameter. This is illustrated via simple examples, namely the Serre equations in shallow water, a generalization of the Klein-Gordon equation in deep water and how to unify these equations in arbitrary depth. The chapter ends with a discussion and caution on how this approach should be used in practice.
Wave Basin | 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 NewUS National Fuel CellFacility | OpenWashington StateWatermill, NewWaukeshaWaushara County,Wave
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, Ohio (Utility Company)Technology Center JumpWaterWaunita HotWave Home
Scattering of internal gravity waves
Leaman Nye, Abigail
2011-04-19T23:59:59.000Z
of the perturbed buoy- ancy field throughout a period of the motion. Curves represent cross-sections taken from the incident beam (cyan); a beam after reflection from a solid horizontal bound- ary (dark blue) and a beam after interaction with the sponge formation... wavenumber components and (b) plots power spectra calculated with Fourier and maximum entropy methods. k˜ is a nondimensional wavenumber representing the number of waves in an across-beam section of length Rc. . . . . . . 114 4.7 Two-dimensional power spectra...
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.
Emergent cosmological constant from colliding electromagnetic waves
Halilsoy, M.; Mazharimousavi, S. Habib; Gurtug, O., E-mail: mustafa.halilsoy@emu.edu.tr, E-mail: habib.mazhari@emu.edu.tr, E-mail: ozay.gurtug@emu.edu.tr [Department of Physics, Eastern Mediterranean University, Gazimavgusa, north Cyprus, Mersin 10 (Turkey)
2014-11-01T23:59:59.000Z
In this study we advocate the view that the cosmological constant is of electromagnetic (em) origin, which can be generated from the collision of em shock waves coupled with gravitational shock waves. The wave profiles that participate in the collision have different amplitudes. It is shown that, circular polarization with equal amplitude waves does not generate cosmological constant. We also prove that the generation of the cosmological constant is related to the linear polarization. The addition of cross polarization generates no cosmological constant. Depending on the value of the wave amplitudes, the generated cosmological constant can be positive or negative. We show additionally that, the collision of nonlinear em waves in a particular class of Born-Infeld theory also yields a cosmological constant.
Particle acceleration in superluminal strong waves
Teraki, Yuto; Nagataki, Shigehiro
2015-01-01T23:59:59.000Z
We calculate the electron acceleration in random superluminal strong waves (SLSWs) and radiation from them by using numerical methods in the context of the termination shock of the pulsar wind nebulae. We pursue the electrons by solving the equation of motion in the analytically expressed electromagnetic turbulences. These consist of primary SLSW and isotropically distributed secondary electromagnetic waves. Under the dominance of the secondary waves, all electrons gain nearly equal energy. On the other hand, when the primary wave is dominant, selective acceleration occurs. The phase of the primary wave felt by the electrons moving nearly along the wavevector changes very slowly compared to the oscillation of the wave, which is called "phase locked", and such electrons are continuously accelerated. This acceleration by SLSWs may play a crucial role in the pre-acceleration for the shock acceleration. In general, the radiation from the phase-locked population is different from the synchro-Compton radiation. How...
Laminated Wave Turbulence: Generic Algorithms II
Elena Kartashova; Alexey Kartashov
2006-11-17T23:59:59.000Z
The model of laminated wave turbulence puts forth a novel computational problem - construction of fast algorithms for finding exact solutions of Diophantine equations in integers of order $10^{12}$ and more. The equations to be solved in integers are resonant conditions for nonlinearly interacting waves and their form is defined by the wave dispersion. It is established that for the most common dispersion as an arbitrary function of a wave-vector length two different generic algorithms are necessary: (1) one-class-case algorithm for waves interacting through scales, and (2) two-class-case algorithm for waves interacting through phases. In our previous paper we described the one-class-case generic algorithm and in our present paper we present the two-class-case generic algorithm.
Irregular wave induced velocities in shallow water
Sultan, Nels John
1991-01-01T23:59:59.000Z
probabil- ity density function. This thesis applies this expanded distribution to fluid particle velocities instead of wave elevations. Ochi (1982) presents a review of recent ad- vances in the stochastic analysis of random seas. He notes that the first..., (Longuet-Higgins 1963), that purely linear waves will have a Gaussian distribu- tion. Therefore, any deviation from a Gaussian distribution must be attributed to wave nonlinearities. Ochi (1982) discusses a series of experiments by Honda and Mitsuyasu...
Nonlinear Characteristics of Wave Propagation over Vegetation
Venkattaramanan, Aravinda
2014-04-28T23:59:59.000Z
2 Experimental setup of Asano et al. (1988) ................................................. 23 3 Description of Norwegian Kelp (Dubi and Torum 1994) .......................... 33 4 Experimental Setup of Dubi and Torum (1994... artificial kelp 13 experiments conducted by Asano et al. (1988). Kobayashi et al. (1993) assumed the vegetation motion was infinitesimally small in comparison to wave amplitude and argued that the wave height decays exponentially as the wave propagates...
Long-range propagation of ocean waves
Young, William R.
hours. Friday, February 22, 2013 #12;OceanPowerTechnologies A 103 foot long, 260ton buoy being tested #12;Wave Power? PelamisWavePower With T=10sec and a = 1 meter, the energy flux is 40kW/meter. An average 40kW/meter of wave power is typical of good sites. Energy Flux = cg × Energy Density = g2 Ta2 8
Interactions and Focusing of Nonlinear Water Waves
Harihar Khanal; Stefan C. Mancas; Shahrdad Sajjadi
2013-02-21T23:59:59.000Z
The coupled cubic nonlinear Schr\\"odinger (CNLS) equations are used to study modulational instabilities of a pair of nonlinearly interacting two-dimensional waves in deep water. It has been shown that the full dynamics of these interacting waves gives rise to localized large-amplitude wavepackets (wave focusing). In this short letter we attempt to verify this result numerically using a Fourier spectral method for the CNLS equations.
Interaction of gravitational waves with matter
A. Cetoli; C. J. Pethick
2011-10-03T23:59:59.000Z
We develop a unified formalism for describing the interaction of gravitational waves with matter that clearly separates the effects of general relativity from those due to interactions in the matter. Using it, we derive a general expression for the dispersion of gravitational waves in matter in terms of correlation functions for the matter in flat spacetime. The self energy of a gravitational wave is shown to have contributions analogous to the paramagnetic and diamagnetic contributions to the self energy of an electromagnetic wave. We apply the formalism to some simple systems - free particles, an interacting scalar field, and a fermionic superfluid.
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.
Gravitational Waves from Neutron Stars: A Review
Lasky, Paul D
2015-01-01T23:59:59.000Z
Neutron stars are excellent emitters of gravitational waves. Squeezing matter beyond nuclear densities invites exotic physical processes, many of which violently transfer large amounts of mass at relativistic velocities, disrupting spacetime and generating copious quantities of gravitational radiation. I review mechanisms for generating gravitational waves with neutron stars. This includes gravitational waves from radio and millisecond pulsars, magnetars, accreting systems and newly born neutron stars, with mechanisms including magnetic and thermoelastic deformations, various stellar oscillation modes and core superfluid turbulence. I also focus on what physics can be learnt from a gravitational wave detection, and where additional research is required to fully understand the dominant physical processes at play.
Gravitational Waves from Neutron Stars: A Review
Paul D. Lasky
2015-08-26T23:59:59.000Z
Neutron stars are excellent emitters of gravitational waves. Squeezing matter beyond nuclear densities invites exotic physical processes, many of which violently transfer large amounts of mass at relativistic velocities, disrupting spacetime and generating copious quantities of gravitational radiation. I review mechanisms for generating gravitational waves with neutron stars. This includes gravitational waves from radio and millisecond pulsars, magnetars, accreting systems and newly born neutron stars, with mechanisms including magnetic and thermoelastic deformations, various stellar oscillation modes and core superfluid turbulence. I also focus on what physics can be learnt from a gravitational wave detection, and where additional research is required to fully understand the dominant physical processes at play.
Sandia National Laboratories: wave energy converters
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
marine hydrokinetic (MHK) reference models (RMs) for wave energy converters and tidal, ocean, and river current energy converters. The RMP team includes a partnership between...
Structural health monitoring by ultrasonic guided waves
Bartoli, Ivan
2007-01-01T23:59:59.000Z
Insight - Non-Destructive Testing & Condition Monitoring,guided waves,” Insight - Non-Destructive Testing & Conditionwave based non-destructive testing,” Ph.D. Dissertation,
Nonlinear manipulation and control of matter waves
E. V. Goldstein; M. G. Moore; P. Meystre
1999-06-23T23:59:59.000Z
This paper reviews some of our recent results in nonlinear atom optics. In addition to nonlinear wave-mixing between matter waves, we also discuss the dynamical interplay between optical and matter waves. This new paradigm, which is now within experimental reach, has the potential to impact a number of fields of physics, including the manipulation and applications of atomic coherence, and the preparation of quantum entanglement between microscopic and macroscopic systems. Possible applications include quantum information processing, matter-wave holography, and nanofabrication.
Fast methods for inverse wave scattering problems
Lee, Jung Hoon, Ph. D. Massachusetts Institute of Technology
2008-01-01T23:59:59.000Z
Inverse wave scattering problems arise in many applications including computerized/diffraction tomography, seismology, diffraction/holographic grating design, object identification from radar singals, and semiconductor ...
Surface waves in orthotropic incompressible materials
Michel Destrade
2013-05-30T23:59:59.000Z
The secular equation for surface acoustic waves propagating on an orthotropic incompressible half-space is derived in a direct manner, using the method of first integrals.
Wave Energy Basics | Department of Energy
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Articles Pressure profile of a wave moving through an offshore structure. Courtesy of MMI Engineering Improving Design Methods for Fixed-Foundation Offshore Wind Energy Systems An...
Full-wave modeling of lower hybrid waves on Alcator C-Mod
Meneghini, Orso (Orso-Maria Cornelio)
2012-01-01T23:59:59.000Z
This thesis focuses on several aspects of the Lower Hybrid (LH) wave physics, the common theme being the development of full-wave simulation codes based on Finite Element Methods (FEM) used in support of experiments carried ...
Li, Bin
2012-11-29T23:59:59.000Z
Most designs for wave energy converters include a hydraulic (or pneumatic) interface between the wave device and the generator to smooth electricity production, but a direct drive power take-off system is a possible way ...
Wavefield Analysis of Rayleigh Waves for Near-Surface Shear-Wave Velocity
Zeng, Chong
2011-05-18T23:59:59.000Z
Shear (S)-wave velocity is a key property of near-surface materials and is the fundamental parameter for many environmental and engineering geophysical studies. Directly acquiring accurate S-wave velocities from a seismic ...
Jia, Dongxing 1984-
2012-11-15T23:59:59.000Z
The Unidirectional Hybrid Wave Model (UHWM) predicts irregular wave kinematics and pressure accurately in comparison with its linear counterpart and modification, especially near the free surface. Hence, in using the ...
Phase Diagram of a Holographic Superconductor Model with s-wave and d-wave
Mitsuhiro Nishida
2014-12-11T23:59:59.000Z
We consider a holographic model with a scalar field, a tensor field and a direct coupling between them as a superconductor with an s-wave and a d-wave. We find a rich phase structure in the model. The model exhibits a phase of coexistence of the s-wave and the d-wave, or a phase of an order competition. Furthermore, it has a triple point.
Solitary waves and conservation laws for highly nonlinear wave equations modeling granular chains
Michelle Przedborski; Stephen C. Anco
2015-07-16T23:59:59.000Z
An exact solitary wave solution is derived for two nonlinear wave equations. These equations model the long wavelength behavior of compression waves in one-dimensional homogeneous granular chains having weak and strong initial pre-compression. The derivation utilizes conservation laws for energy, momentum, and net displacement speed, which are found through a direct method without using Noether's theorem. Properties of the solitary wave solution, including its width and height, are examined.
Hollow Core Fiber Optics for Mid-Wave and Long-Wave Infrared Spectroscopy
Hollow Core Fiber Optics for Mid-Wave and Long-Wave Infrared Spectroscopy Jason M. Kriesel and testing of hollow core glass waveguides (i.e., fiber optics) for use in Mid-Wave Infrared (MWIR) and Long related applications, and fiber optics are a key enabling technology needed to improve the utility
Thompson/Ocean 420/Winter 2005 Surface Gravity Wave Surface Gravity Wave Generation
Thompson, LuAnne
the wavelength. Wind energy in Waves Wave energy out (breaking) #12;Thompson/Ocean 420/Winter 2005 Surface waves with different periods and phases. The spectrum of energy is usually plotted as energy density, (unit of energy/unit frequency interval, Hz). The energy density is given by the amount of energy
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...
Mathematical Theory of Water Waves John D. Carter
Carter, John
. Carter Mathematical Theory of Water Waves #12;Water Waves Surface waves in the deep ocean during a stormMathematical Theory of Water Waves John D. Carter October 11, 2010 John D. Carter Mathematical Theory of Water Waves #12;About Me B.S. in mathematics from UPS, 1994 M.S. in applied mathematics from CU
16. Wave-particle interaction 16.1 Landau damping
Pohl, Martin Karl Wilhelm
16. Wave-particle interaction 16.1 Landau damping We started our discussion of hydromagnetic waves with simple one-dimensional electrostatic fluctuations, the Langmuir waves. We derived their dispersion was the relationship between the waves and the plasma. Can the waves change plasma properties or, vice versa, can
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.
WAVENET : Nearshore Wave Recording Network for
WAVENET : Nearshore Wave Recording Network for England and Wales Feasibility Study P J Hawkes R Atkins A H Brampton D Fortune R Garbett B P Gouldby Report TR 122 April 2001 #12;#12;WAVENET : Nearshore 05/03/02 Summary WAVENET : Nearshore Wave Recording Network for England and Wales Feasibility Study P
Possible new wave phenomena in the brain
Jerzy Szwed
2009-08-10T23:59:59.000Z
We propose to search for new wave phenomena in the brain by using interference effects in analogy to the well-known double slit (Young) experiment. This method is able to extend the range of oscillation frequencies to much higher values than currently accessible. It is argued that such experiments may test the hypothesis of the wave nature of information coding.
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.
Nonlinear inertial Alfven wave in dusty plasmas
Mahmood, S. [Theoretical Plasma Physics Division, P.O. Nilore Islamabad 44000 (Pakistan); National Center for Physics, Shadra Valley, Quaid-i-Azam University Islamabad 44000 (Pakistan); Saleem, H. [National Center for Physics, Shadra Valley, Quaid-i-Azam University Islamabad 44000 (Pakistan)
2011-11-29T23:59:59.000Z
Solitary inertial Alfven wave in the presence of positively and negatively charged dust particles is studied. It is found that electron density dips are formed in the super Alfvenic region and wave amplitude is increased for the case of negatively charged dust particles in comparison with positively charged dust particles in electron-ion plasmas.
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.
Rogue Waves UNIVERSITY OF MIAMI ROSENSTIEL SCHOOL
Miami, University of
, monitoring what used to be considered merely nautical myth, and working to create a warning system to protect kinds of weather conditions. The Future: Preparation and Warning Systems Rosenstiel School researchers--the recent tsunami is testimony to that. But tsunamis are not freak or rogue waves--another kind of wave
LOCAL RUNUP AMPLIFICATION BY RESONANT WAVE INTERACTIONS
Paris-Sud XI, Université de
wave-gage recordings from real tsunami simulations, are used as forcing conditions to the BVP. Resonant in enhanced runup of non-leading waves. The evolution of energy reveals the exis- tence of a quasi tsunamis (Nicaragua and Flores Island), measurements suggested that the shoreline receded before inundation
Dynamical Casimir effect on surface waves
A. A. Saharian
2010-10-28T23:59:59.000Z
We consider the quantum radiation of scalar particles from a surface wave excited on a plane surface of a mirror. It is assumed that the field obeys Dirichlet condition on the boundary of the mirror. In both cases of running and standing surface waves the expression is given for the spectral-angular distribution of the number of the radiated quanta.
A radiometer for stochastic gravitational waves
Stefan W. Ballmer
2005-10-20T23:59:59.000Z
The LIGO Scientific Collaboration recently reported a new upper limit on an isotropic stochastic background of gravitational waves obtained based on the data from the 3rd LIGO science Run (S3). Now I present a new method for obtaining directional upper limits that the LIGO Scientific Collaboration intends to use for future LIGO science runs and that essentially implements a gravitational wave radiometer.
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.
Making and Propagating Elastic Waves: Overview of the new wave propagation code WPP
McCandless, K P; Petersson, N A; Nilsson, S; Rodgers, A; Sjogreen, B; Blair, S C
2006-05-09T23:59:59.000Z
We are developing a new parallel 3D wave propagation code at LLNL called WPP (Wave Propagation Program). WPP is being designed to incorporate the latest developments in embedded boundary and mesh refinement technology for finite difference methods, as well as having an efficient portable implementation to run on the latest supercomputers at LLNL. We are currently exploring seismic wave applications, including a recent effort to compute ground motions for the 1906 Great San Francisco Earthquake. This paper will briefly describe the wave propagation problem, features of our numerical method to model it, implementation of the wave propagation code, and results from the 1906 Great San Francisco Earthquake simulation.
Gravitational waves versus black holes
Trevor W. Marshall
2007-07-02T23:59:59.000Z
It is argued that, in order for the gravitational field to be propagated as a wave, it is necessary for it to satisfy a further set of field equations, in addition to those of Einstein and Hilbert, and these equations mean there is a preferred coordinate frame, called the Global Inertial Frame, giving rise to a unique metric . The implication is that a true gravitational field is not compatible with Einstein's Principle of Equivalence, which is in contradiction with his other fundamental concept of locality. The additional field equations ensure that gravitational collapse does not go below the Schwarzschild radius, thereby excluding the possibility of singular solutions (black holes) of the Einstein-Hilbert equations. Such solutions would also violate Einstein's locality principle.
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.
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.
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...
The Gravitational Wave International Committee Roadmap: The future of gravitational wave astronomy
Jay Marx; Karsten Danzmann; James Hough; Kazuaki Kuroda; David McClelland; Benoit Mours; Sterl Phinney; Sheila Rowan; B. Sathyaprakash; Flavio Vetrano; Stefano Vitale; Stan Whitcomb; Clifford Will
2011-11-24T23:59:59.000Z
Gravitational wave science is on the verge of direct observation of the waves predicted by Einstein's General Theory of Relativity and opening the exciting new field of gravitational wave astronomy. In the coming decades, ultra-sensitive arrays of ground-based instruments and complementary spaced-based instruments will observe the gravitational wave sky, inevitably discovering entirely unexpected phenomena while providing new insight into many of the most profound astrophysical phenomena known. in July 2007 the Gravitational Wave International Committee (GWIC) initiated the development of a strategic roadmap for the field of gravitational wave science with a 30-year horizon. The goal of this roadmap is to serve the international gravitational wave community and its stakeholders as a tool for the development of capabilities and facilities needed to address the exciting scientific opportunities on the intermediate and long-term horizons.
Spatial and temporal modulation of internal waves and thermohaline structure
Cole, Sylvia T.
2010-01-01T23:59:59.000Z
of outward internal wave energy and dissipation was 17 GW.timescale, the internal wave energy cascade that concludes2 addresses the internal wave energy cascade and its spatial
FRACTURE DETECTION IN CRYSTALLINE ROCK USING ULTRASONIC SHEAR WAVES
Waters, K.H.
2011-01-01T23:59:59.000Z
water interface. Thus, no S^| wave energy should penetrate asimilar situation some P wave energy is transmitted into thesome sort of "parasitic" P wave energy created by the S u H
Finite Difference Elastic Wave Modeling Including Surface Topography
Al Muhaidib, Abdulaziz
2011-01-01T23:59:59.000Z
Surface topography and the weathered zone (i.e., heterogeneity near the earth’s surface) have great effects on elastic wave propagation. Both surface waves and body waves are contaminated by scattering and conversion by ...
Dynamics and stability of gravity-capillary solitary waves
Calvo, David C. (David Christopher)
2001-01-01T23:59:59.000Z
Over the past several years, it has been recognized that a new class of solitary waves can propagate in nonlinear dispersive wave systems if the phase speed of linear waves attains a local extremum at some finite wavenumber. ...
2011201120112011 2011 Symposium on Piezoelectricity, Acoustic waves, and Device Application
Chen, Baoquan
2011201120112011 2011 Symposium on Piezoelectricity, Acoustic waves, and Device Application 811108146308091001 #12;2011201120112011 2011 Symposium on Piezoelectricity, Acoustic waves, and Device Application;2011201120112011 2011 Symposium on Piezoelectricity, Acoustic waves, and Device Application 12121212 9999 ----11111111
Wave-induced motion of ramp-interconnected craft
Oonk, Stephen Holt
2008-01-01T23:59:59.000Z
OF CALIFORNIA, SAN DIEGO Wave-Induced Motion of Ramp-5 2.1 Mathematical Description of the Wave49 4.2 Case 1: Waves are Parallel to Ship-Ramp-Ship Axis (
Millimeter-Wave Circuits for 60GHz and Beyond
Afshar, Bagher
2010-01-01T23:59:59.000Z
Device Modeling for mm-Wave Design . . . . . . . . . .Devices for mm-Wave Design . . . . . . . . . . . . . .9.2 Previous Work on mm-Wave Power Ampli?ers in SiGe
Origin and Properties of the Electrocardiogram T-Wave
Frid, Anna Alexandra
2012-01-01T23:59:59.000Z
309. Antzelevitch C, Yan GX. J wave syndromes. Heart Rhythm.D, Murray A. Explaiing the T-wave shape in the ECG. Nature.cells can be used to study T wave specific pathologies such
WAVE-ENERGY DENSITY AND WAVE-MOMENTUM DENSITY OF EACH SPECIES OF A COLLISION-LESS PLASMA
Cary, John R.
2012-01-01T23:59:59.000Z
case, the electrons have negative wave energy for 2w ne w wave energy for 2w . > w > 0 nlw/k to the negative wave energy of the electrons. positive
Wave Energy Harvesting unmanned maritime vehicle, Concept and Applications
Frandsen, Jannette B.
Wave Energy Harvesting unmanned maritime vehicle, Concept and Applications Justin Manley Senior). By harvesting abundant natural energy Wave Gliders provide a persistent ocean presence to commercial scientific
Binding Energy of dº Transition Metals to Alkenes By Wave...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Energy of dº Transition Metals to Alkenes By Wave Function Theory and Density Functional Theory. Binding Energy of dº Transition Metals to Alkenes By Wave Function Theory...
Potential Impacts of Hydrokinetic and Wave Energy Conversion...
Potential Impacts of Hydrokinetic and Wave Energy Conversion Technologies on Aquatic Environments Potential Impacts of Hydrokinetic and Wave Energy Conversion Technologies on...
Columbia Power Technologies, Inc. Deploys its Direct Drive Wave...
Broader source: Energy.gov (indexed) [DOE]
with EERE support, Columbia Power Technologies, Inc. (CPT) deployed an intermediate-scale wave energy converter to demonstrate and validate its direct drive wave energy Buoy...
Advancing Technology Readiness: Wave Energy Testing and Demonstration...
Broader source: Energy.gov (indexed) [DOE]
National Marine Renewable Energy Center (NNMREC), verified the functionality of the Wave Energy Technology - New Zealand (WET-NZ) device through wave tank testing and...
Mapping and Assessment of the United States Ocean Wave Energy...
Broader source: Energy.gov (indexed) [DOE]
describes the analysis and results of a rigorous assessment of the United States ocean wave energy resource. mapping and assessment of us ocean More Documents & Publications Wave...
Proceedings of the Hydrokinetic and Wave Energy Technologies...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Proceedings of the Hydrokinetic and Wave Energy Technologies Technical and Environmental Issues Workshop Proceedings of the Hydrokinetic and Wave Energy Technologies Technical and...
Mapping and Assessment of the United States Ocean Wave Energy...
Mapping and Assessment of the United States Ocean Wave Energy Resource This project estimates the naturally available and technically recoverable U.S. wave energy resources, using...
Using Radio Waves to Control Fusion Plasma Density
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Using Radio Waves to Control Fusion Plasma Density Using Radio Waves to Control Fusion Plasma Density Simulations Run at NERSC Support Fusion Experiments at MIT, General Atomics...
An actin-based wave generator organizes cell motility
Weiner, Orion D; Marganski, William A; Wu, Lani F; Altschuler, Steven J; Kirschner, Marc W
2007-01-01T23:59:59.000Z
Polymer Is Required for Wave Movement and Hem-1 RecyclingPolymers Are Required for Wave Movement and Hem-1 Recycling (
Wave-particle Interactions In Rotating Mirrors
Abraham J. Fetterman and Nathaniel J. Fisch
2011-01-11T23:59:59.000Z
Wave-particle interactions in E×B rotating plasmas feature an unusual effect: particles are diffused by waves in both potential energy and kinetic energy. This wave-particle interaction generalizes the alpha channeling effect, in which radio frequency waves are used to remove alpha particles collisionlessly at low energy. In rotating plasmas, the alpha particles may be removed at low energy through the loss cone, and the energy lost may be transferred to the radial electric field. This eliminates the need for electrodes in the mirror throat, which have presented serious technical issues in past rotating plasma devices. A particularly simple way to achieve this effect is to use a high azimuthal mode number perturbation on the magnetic field. Rotation can also be sustained by waves in plasmas without a kinetic energy source. This type of wave has been considered for plasma centrifuges used for isotope separation. Energy may also be transferred from the electric field to particles or waves, which may be useful for ion heating and energy generation.
The Wave Function and Quantum Reality
Shan Gao
2011-08-04T23:59:59.000Z
We investigate the meaning of the wave function by analyzing the mass and charge density distribution of a quantum system. According to protective measurement, a charged quantum system has mass and charge density proportional to the modulus square of its wave function. It is shown that the mass and charge density is not real but effective, and it is formed by the ergodic motion of a localized particle with the total mass and charge of the system. Moreover, it is argued that the ergodic motion is not continuous but discontinuous and random. This result suggests a new interpretation of the wave function, according to which the wave function is a description of random discontinuous motion of particles, and the modulus square of the wave function gives the probability density of the particles being in certain locations. It is shown that the suggested interpretation of the wave function disfavors the de Broglie-Bohm theory and the many-worlds interpretation but favors the dynamical collapse theories, and the random discontinuous motion of particles may provide an appropriate random source to collapse the wave function.
Peralta, J.; López-Valverde, M. A. [Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía, 18008 Granada (Spain); Imamura, T. [Institute of Space and Astronautical Science-Japan Aerospace Exploration Agency 3-1-1, Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan); Read, P. L. [Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford (United Kingdom); Luz, D. [Centro de Astronomia e Astrofísica da Universidade de Lisboa (CAAUL), Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa (Portugal); Piccialli, A., E-mail: peralta@iaa.es [LATMOS, UVSQ, 11 bd dAlembert, 78280 Guyancourt (France)
2014-07-01T23:59:59.000Z
This paper is the first of a two-part study devoted to developing tools for a systematic classification of the wide variety of atmospheric waves expected on slowly rotating planets with atmospheric superrotation. Starting with the primitive equations for a cyclostrophic regime, we have deduced the analytical solution for the possible waves, simultaneously including the effect of the metric terms for the centrifugal force and the meridional shear of the background wind. In those cases when the conditions for the method of the multiple scales in height are met, these wave solutions are also valid when vertical shear of the background wind is present. A total of six types of waves have been found and their properties were characterized in terms of the corresponding dispersion relations and wave structures. In this first part, only waves that are direct solutions of the generic dispersion relation are studied—acoustic and inertia-gravity waves. Concerning inertia-gravity waves, we found that in the cases of short horizontal wavelengths, null background wind, or propagation in the equatorial region, only pure gravity waves are possible, while for the limit of large horizontal wavelengths and/or null static stability, the waves are inertial. The correspondence between classical atmospheric approximations and wave filtering has been examined too, and we carried out a classification of the mesoscale waves found in the clouds of Venus at different vertical levels of its atmosphere. Finally, the classification of waves in exoplanets is discussed and we provide a list of possible candidates with cyclostrophic regimes.
Yu, Y.; Li, Y.
2011-10-01T23:59:59.000Z
This paper presents the results of a preliminary study on the hydrodynamics of a moored floating-point absorber (FPA) wave energy system under extreme wave conditions.
Electromagnetic waves, gravitational coupling and duality analysis
E. M. C. Abreu; C. Pinheiro; S. A. Diniz; F. C. Khanna
2005-10-27T23:59:59.000Z
In this letter we introduce a particular solution for parallel electric and magnetic fields, in a gravitational background, which satisfy free-wave equations and the phenomenology suggested by astrophysical plasma physics. These free-wave equations are computed such that the electric field does not induce the magnetic field and vice-versa. In a gravitational field, we analyze the Maxwell equations and the corresponding electromagnetic waves. A continuity equation is presented. A commutative and noncommutative analysis of the electromagnetic duality is described.
Protective, Modular Wave Power Generation System
Vvedensky, Jane M.; Park, Robert Y.
2012-11-27T23:59:59.000Z
The concept of small wave energy conversion modules that can be built into large, scalable arrays, in the same vein as solar panels, has been developed. This innovation lends itself to an organic business and development model, and enables the use of large-run manufacturing technology to reduce system costs. The first prototype module has been built to full-scale, and tested in a laboratory wave channel. The device has been shown to generate electricity and dissipate wave energy. Improvements need to be made to the electrical generator and a demonstration of an array of modules should be made in natural conditions.
Ion acoustic shock waves in degenerate plasmas
Akhtar, N. [Theoretical Plasma Physics Division, PINSTECH, Nilore, Islamabad 44000 Pakistan (Pakistan); Hussain, S. [Theoretical Plasma Physics Division, PINSTECH, Nilore, Islamabad 44000 Pakistan (Pakistan); Department of Physics and Applied Mathematics, PIEAS, Nilore, Islamabad 44000 Pakistan (Pakistan)
2011-07-15T23:59:59.000Z
Korteweg de Vries Burgers equation for negative ion degenerate dissipative plasma has been derived using reductive perturbation technique. The quantum hydrodynamic model is used to study the quantum ion acoustic shock waves. The effects of different parameters on quantum ion acoustic shock waves are studied. It is found that quantum parameter, electrons Fermi temperature, temperature of positive and negative ions, mass ratio of positive to negative ions, viscosity, and density ratio have significant impact on the shock wave structure in negative ion degenerate plasma.
Surface waves in deformed Bell materials
Michel Destrade
2013-04-30T23:59:59.000Z
Small amplitude inhomogeneous plane waves are studied as they propagate on the free surface of a predeformed semi-infinite body made of Bell constrained material. The predeformation corresponds to a finite static pure homogeneous strain. The surface wave propagates in a principal direction of strain and is attenuated in another principal direction, orthogonal to the free surface. For these waves, the secular equation giving the speed of propagation is established by the method of first integrals. This equation is not the same as the secular equation for incompressible half-spaces, even though the Bell constraint and the incompressibility constraint coincide in the isotropic infinitesimal limit.
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.
Spatial wave functions of photon and electron
Khokhlov, D. L. [Sumy State University, R.-Korsakov St. 2, Sumy 40007 (Ukraine)
2010-12-01T23:59:59.000Z
The quantum mechanical model of the photon and electron is considered. The photon is conceived of as a particle moving with the speed of light which is accompanied by the wave function of the photon spreading out with an infinite speed. The wave function of the electron is introduced in terms of virtual photons tied to the electron. A description of electrostatic and magnetostatic interactions is given through the wave functions of electrons. The approach provides an explanation of the results of recent experiments measuring the speed of propagation of the bound magnetic field.
Counting energy packets in the electromagnetic wave
Stefan Popescu; Bernhard Rothenstein
2007-05-18T23:59:59.000Z
We discuss the concept of energy packets in respect to the energy transported by electromagnetic waves and we demonstrate that this physical quantity can be used in physical problems involving relativistic effects. This refined concept provides results compatible to those obtained by simpler definition of energy density when relativistic effects apply to the free electromagnetic waves. We found this concept further compatible to quantum theory perceptions and we show how it could be used to conciliate between different physical approaches including the classical electromagnetic wave theory, the special relativity and the quantum theories.
Wirosoetisno, Djoko
ships to oil rigs, repair vessels for offshore wind farms, rescue vessels, and coast guard vessels with structures. We aim to progress nonlinear and breaking wave interactions on offshore structures, in particular
Ramakrishnan Iyer; Clifford V. Johnson; Jeffrey S. Pennington
2010-02-05T23:59:59.000Z
We uncover a remarkable role that an infinite hierarchy of non-linear differential equations plays in organizing and connecting certain {hat c}<1 string theories non-perturbatively. We are able to embed the type 0A and 0B (A,A) minimal string theories into this single framework. The string theories arise as special limits of a rich system of equations underpinned by an integrable system known as the dispersive water wave hierarchy. We observe that there are several other string-like limits of the system, and conjecture that some of them are type IIA and IIB (A,D) minimal string backgrounds. We explain how these and several string-like special points arise and are connected. In some cases, the framework endows the theories with a non-perturbative definition for the first time. Notably, we discover that the Painleve IV equation plays a key role in organizing the string theory physics, joining its siblings, Painleve I and II, whose roles have previously been identified in this minimal string context.
Numerical wave optics and the lensing of gravitational waves by globular clusters
Andrew J. Moylan; David E. McClelland; Susan M. Scott; Antony C. Searle; G. V. Bicknell
2007-10-16T23:59:59.000Z
We consider the possible effects of gravitational lensing by globular clusters on gravitational waves from asymmetric neutron stars in our galaxy. In the lensing of gravitational waves, the long wavelength, compared with the usual case of optical lensing, can lead to the geometrical optics approximation being invalid, in which case a wave optical solution is necessary. In general, wave optical solutions can only be obtained numerically. We describe a computational method that is particularly well suited to numerical wave optics. This method enables us to compare the properties of several lens models for globular clusters without ever calling upon the geometrical optics approximation, though that approximation would sometimes have been valid. Finally, we estimate the probability that lensing by a globular cluster will significantly affect the detection, by ground-based laser interferometer detectors such as LIGO, of gravitational waves from an asymmetric neutron star in our galaxy, finding that the probability is insignificantly small.
H. Yan; K. Liao; Z. Deng; J. He; Z. Y. Xue; Z. M. Zhang; S. L. Zhu
2014-12-04T23:59:59.000Z
Light's wave-particle duality is at the heart of quantum mechanics and can be well illustrated by Wheeler's delayed-choice experiment. The choice of inserting or removing the second classical (quantum) beam splitter in a Mach-Zehnder interferometer determines the classical (quantum) wave-particle behaviors of a photon. In this paper, we report our experiment using the classical beam splitter to observe the simultaneous wave-particle behaviors in the wave-packet of a narrowband single photon. This observation suggests that it is necessary to generalize the current quantum wave-particle duality theory. Our experiment demonstrates that the produced wave-particle state can be considered an additional degree of freedom and can be utilized in encoding quantum information.
Stochastic analysis of ocean wave states with and without rogue waves
Hadjihosseini, A; Hoffmann, N P
2014-01-01T23:59:59.000Z
This work presents an analysis of ocean wave data including rogue waves. A stochastic approach based on the theory of Markov processes is applied. With this analysis we achieve a characterization of the scale dependent complexity of ocean waves by means of a Fokker-Planck equation, providing stochastic information of multi-scale processes. In particular we show evidence of Markov properties for increment processes, which means that a three point closure for the complexity of the wave structures seems to be valid. Furthermore we estimate the parameters of the Fokker-Planck equation by parameter-free data analysis. The resulting Fokker-Planck equations are verified by numerical reconstruction. This work presents a new approach where the coherent structure of rogue waves seems to be integrated into the fundamental statistics of complex wave states.
The gravitational wave symphony of the Universe
B. S. Sathyaprakash
2002-07-10T23:59:59.000Z
The new millennium will see the upcoming of several ground-based interferometric gravitational wave antennas. Within the next decade a space-based antenna may also begin to observe the distant Universe. These gravitational wave detectors will together operate as a network taking data continuously for several years, watching the transient and continuous phenomena occurring in the deep cores of astronomical objects and dense environs of the early Universe where gravity was extremely strong and highly non-linear. The network will listen to the waves from rapidly spinning non-axisymmetric neutron stars, normal modes of black holes, binary black hole inspiral and merger, phase transitions in the early Universe, quantum fluctuations resulting in a characteristic background in the early Universe. The gravitational wave antennas will open a new window to observe the dark Universe unreachable via other channels of astronomical observations.
Gravity waves from vortex dipoles and jets
Wang, Shuguang
2009-05-15T23:59:59.000Z
The dissertation first investigates gravity wave generation and propagation from jets within idealized vortex dipoles using a nonhydrostatic mesoscale model. Several initially balanced and localized jets induced by vortex dipoles are examined here...
Density shock waves in confined microswimmers
Tsang, Alan Cheng Hou
2015-01-01T23:59:59.000Z
Motile and driven particles confined in microfluidic channels exhibit interesting emergent behavior from propagating density bands to density shock waves. A deeper understanding of the physical mechanisms responsible for these emergent structures is relevant to a number of physical and biomedical applications. Here, we study the formation of density shock waves in the context of an idealized model of microswimmers confined in a narrow channel and subject to a uniform external flow. Interestingly, these density shock waves exhibit a transition from `subsonic' with compression at the back to `supersonic' with compression at the front of the population as the intensity of the external flow increases. This behavior is the result of a non-trivial interplay between hydrodynamic interactions and geometric confinement, and is confirmed by a novel quasilinear wave model that properly captures the dependence of the shock formation on the external flow. These findings can be used to guide the development of novel mechan...
New Perspectives on Wave Energy Converter Control
Price, Alexandra A E
2009-01-01T23:59:59.000Z
This work examines some of the fundamental problems behind the control of wave energy converters (WECs). Several new perspectives are presented to aid the understanding of the problem and the interpretation of the ...
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 ...
Power recycling for an interferometric gravitational wave
Ejiri, Shinji
THESIS Power recycling for an interferometric gravitational wave detector Masaki Ando Department . . . . . . . . . . . . . . 48 3.3 Power recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 3.3.1 Principle of power recycling . . . . . . . . . . . . . . . . . 50 3.3.2 Recycling cavity
Volkov wave function: its orthonormality and completeness
Enderalp Yakaboylu
2015-05-25T23:59:59.000Z
The present note aims to provide a clear and explicit derivation of the orthonormality condition, and the completeness property of the Volkov wave function. Thus, none of the results are new.
Structural health monitoring by ultrasonic guided waves
Bartoli, Ivan
2007-01-01T23:59:59.000Z
of UAV wing skin-to-spar joints using guided waves and macroof composite wing skin-to-spar bonded joints in aerospaceof composite wing skin-to-spar bonded joints in aerospace
Fast wave evanescence in filamentary boundary plasmas
Myra, J. R. [Lodestar Research Corporation, Boulder, Colorado 80027 (United States)] [Lodestar Research Corporation, Boulder, Colorado 80027 (United States)
2014-02-15T23:59:59.000Z
Radio frequency waves for heating and current drive of plasmas in tokamaks and other magnetic confinement devices must first traverse the scrape-off-layer (SOL) before they can be put to their intended use. The SOL plasma is strongly turbulent and intermittent in space and time. These turbulent properties of the SOL, which are not routinely taken into account in wave propagation codes, can have an important effect on the coupling of waves through an evanescent SOL or edge plasma region. The effective scale length for fast wave (FW) evanescence in the presence of short-scale field-aligned filamentary plasma turbulence is addressed in this paper. It is shown that although the FW wavelength or evanescent scale length is long compared with the dimensions of the turbulence, the FW does not simply average over the turbulent density; rather, the average is over the exponentiation rate. Implications for practical situations are discussed.
Existence of Standing waves in deep water
Existence of Standing waves in deep water G.Iooss, INLN, 06560 Valbonne, France This is a joint work with J.Toland and P.Plotnikov. We consider the classical ...
Parameterization and Statistical Analysis of Hurricane Waves
Mclaughlin, Patrick William
2014-05-03T23:59:59.000Z
the JPM-OS methodology yielded extreme value statistics for 179 stations of interest. Maps detailing the spatial extents of the 100 and 1000 year maximum wave event were created using ArcGIS....
Nonlinear extraordinary wave in dense plasma
Krasovitskiy, V. B., E-mail: krasovit@mail.ru [Russian Academy of Sciences, Keldysh Institute of Applied Mathematics (Russian Federation); Turikov, V. A. [Russian University of Peoples’ Friendship (Russian Federation)] [Russian University of Peoples’ Friendship (Russian Federation)
2013-10-15T23:59:59.000Z
Conditions for the propagation of a slow extraordinary wave in dense magnetized plasma are found. A solution to the set of relativistic hydrodynamic equations and Maxwell’s equations under the plasma resonance conditions, when the phase velocity of the nonlinear wave is equal to the speed of light, is obtained. The deviation of the wave frequency from the resonance frequency is accompanied by nonlinear longitudinal-transverse oscillations. It is shown that, in this case, the solution to the set of self-consistent equations obtained by averaging the initial equations over the period of high-frequency oscillations has the form of an envelope soliton. The possibility of excitation of a nonlinear wave in plasma by an external electromagnetic pulse is confirmed by numerical simulations.
Deepwater Internal Wave Study and Application
Jiang, Lei
2013-12-10T23:59:59.000Z
and ocean currents. Although their effects on floating drilling platforms and their riser systems have not been extensively studied, in the past these waves have seriously disrupted offshore exploration and drilling operations. In particular, a drill pipe...
Aspects of wave turbulence in preheating
Crespo, José A.; De Oliveira, H.P., E-mail: jaacrespo@gmail.com, E-mail: oliveira@dft.if.uerj.br [Universidade do Estado do Rio de Janeiro, Instituto de Física - Departamento de Física Teórica, Rio de Janeiro, RJ, CEP 20550-013 Brazil. (Brazil)
2014-06-01T23:59:59.000Z
In this work we have studied the nonlinear preheating dynamics of several inflationary models. It is well established that after a linear stage of preheating characterized by the parametric resonance, the nonlinear dynamics becomes relevant driving the system towards turbulence. Wave turbulence is the appropriated description of this phase since the matter contents are fields instead of usual fluids. Turbulence develops due to the nonlinear interations of waves, here represented by the small inhomogeneities of the scalar fields. We present relevant aspects of wave turbulence such as the Kolmogorov-Zakharov spectrum in frequency and wave number that indicates the energy transfer through scales. From the power spectrum of the matter energy density we were able to estimate the temperature of the thermalized system.
Lagrangian coherent structures and internal wave attractors
Tang, Wenbo
For a nonuniformly stratified layer of fluid, internal gravity waves propagate at varying angles depending on the local buoyancy and Coriolis (in geophysical applications) frequencies. Relatively confined geometries, such ...
Mead, Carver
2015-01-01T23:59:59.000Z
Gravitational coupling of the propagation four-vectors of matter wave functions is formulated in flat space-time. Coupling at the momentum level rather than at the "force-law" level greatly simplifies many calculations. This locally Lorentz-invariant approach (G4v) treats electromagnetic and gravitational coupling on an equal footing. Classical mechanics emerges from the incoherent aggregation of matter wave functions. The theory reproduces, to first order beyond Newton, the standard GR results for Gravity-Probe B, deflection of light by massive bodies, precession of orbits, gravitational red shift, and total gravitational-wave energy radiated by a circular binary system. Its predictions of total radiated energy from highly eccentric Kepler systems are slightly larger than those of similar GR treatments. G4v predictions differ markedly from those of GR for the gravitational-wave radiation patterns from rotating massive systems, and for the LIGO antenna pattern. The predicted antenna patterns have been shown t...
Guidelines in Wave Energy Conversion System Design
Guiberteau, K. L.; Liu, Y.; Lee, J.; Kozman, T.
2014-01-01T23:59:59.000Z
This paper presents an investigational study on wave energy converters (WECs). The types of WEC available from the market are studied first. The design considerations for implementing a WEC in the Gulf of Mexico (GOM) are then evaluated...
Energy storage and generation from thermopower waves
Abrahamson, Joel T. (Joel Theodore)
2012-01-01T23:59:59.000Z
The nonlinear coupling between an exothermic chemical reaction and a nanowire or nanotube with large axial heat conduction guides a self-propagating thermal wave along the nano-conduit. The thermal conduit accelerates the ...
Spin- and Pair-Density-Wave Glasses
Mross, David F.
Spontaneous breaking of translational symmetry, known as density-wave order, is common in nature. However, such states are strongly sensitive to impurities or other forms of frozen disorder leading to fascinating glassy ...
Interaction Dynamics of Singular Wave Fronts
Holm, Darryl D
2013-01-01T23:59:59.000Z
Some of the most impressive singular wave fronts seen in Nature are the transbasin oceanic internal waves, which may be observed from the Space Shuttle as they propagate and interact with each other, for example, in the South China Sea. The characteristic feature of these strongly nonlinear wavefronts is that they reconnect when two of them collide transversely. We derive the EPDiff equation, and use it to model this phenomenon as elastic collisions between singular wave fronts (solitons) whose momentum is distributed along curves moving in the plane. Numerical methods for EPDiff based on compatible differencing algorithms (CDAs) are used for simulating these collisions among curves. The numerical results show the same nonlinear behavior of wavefront reconnections as that observed for internal waves in the South China Sea. We generalize the singular solutions of EPDiff for other applications, in computational anatomy and in imaging science, where the singular wavefronts are evolving image outlines, whose mome...
Apparatus and method for generating mechanical waves
Allensworth, D.L.; Chen, P.J.
1982-10-25T23:59:59.000Z
Mechanical waves are generated in a medium by subjecting an electromechanical element to an alternating electric field having a frequency which induces mechanical resonance therein and is below any electrical resonance frequency thereof.
Broader source: Energy.gov [DOE]
The UK is currently the undisputed global leader in marine energy, with more wave and tidal stream devices installed than the rest of the world combined. This leading position is built on an...
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...
Wave Patterns and Southern Hemisphere Convergence Zones
Ramotowski, Michelle R.
2013-04-11T23:59:59.000Z
Data from satellites and reanalysis products are analyzed to study the behavior of wave trains in the three major Southern Hemisphere Convergences zones: the South Pacific, the South Atlantic, and the South Indian. Using ...
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.
Double Kelvin Wave Cascade in Superfluid Helium
G. Boffetta; A. Celani; D. Dezzani; J. Laurie; S. Nazarenko
2008-10-20T23:59:59.000Z
We study the double cascade of energy and wave action in a local model of superfluid vortex filaments. The model is obtained from a truncated expansion of the 2D Local Induction Approximation and it is shown to support six-wave interactions. We argue that, because of the uncertainty in the vortex core profile, this model has the same status of validity as the traditionally used Biot-Savart model with cutoff, but it has advantage of being much simpler. Our minimal model leads to a wave kinetic equation for which we predict existence of two distinct power-law scaling in the spectrum, corresponding to a direct cascade of energy and an inverse one of wave action. Direct numerical simulations confirm the theoretical predictions in the weak turbulence regime.
Causality in scalar-Einstein waves
Mark D. Roberts
2015-03-13T23:59:59.000Z
A wavelike scalar-Einstein solution is found and indicating vectors constructed from the Bel-Robinson tensor are used to study which objects co-move with the wave and whether gravitational energy transfer is null.
Long Wave Breaking Effects on Fringing Reefs
Goertz, John 1985-
2012-12-12T23:59:59.000Z
Modeling of wave energy transformation and breaking on fringing reefs is inherently difficult due to the unique topography of reefs. Prior methods of determining dissipation are based on empirical data from gently sloping beaches and offer only bulk...
Gravitational wave memory in de Sitter spacetime
Bieri, Lydia; Yau, Shing-Tung
2015-01-01T23:59:59.000Z
We examine gravitational wave memory in the case where sources and detector are in an expanding cosmology. For simplicity, we treat the case where the cosmology is de Sitter spacetime, and discuss the possibility of generalizing our results to the case of a more realistic cosmology. We find results very similar to those of gravitational wave memory in an asymptotically flat spacetime, but with the magnitude of the effect multiplied by a redshift factor.
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.
Alfven wave. DOE Critical Review Series
Hasegawa, A.; Uberoi, C.
1982-01-01T23:59:59.000Z
This monograph deals with the properties of Alfven waves and with their application to fusion. The book is divided into 7 chapters dealing with linear properties in homogeneous and inhomogeneous plasmas. Absorption is treated by means of kinetic theory. Instabilities and nonlinear processes are treated in Chapters 1 to 6, and the closing chapter is devoted to theory and experiments in plasma heating by Alfven waves. (MOW)
Optical fiber having wave-guiding rings
Messerly, Michael J. (Danville, CA); Dawson, Jay W. (Livermore, CA); Beach, Raymond J. (Livermore, CA); Barty, Christopher P. J. (Hayward, CA)
2011-03-15T23:59:59.000Z
A waveguide includes a cladding region that has a refractive index that is substantially uniform and surrounds a wave-guiding region that has an average index that is close to the index of the cladding. The wave-guiding region also contains a thin ring or series of rings that have an index or indices that differ significantly from the index of the cladding. The ring or rings enable the structure to guide light.
Shock wave propagation in vibrofluidized granular materials
Kai Huang; Guoqing Miao; Peng Zhang; Yi Yun; Rongjue Wei
2005-11-29T23:59:59.000Z
Shock wave formation and propagation in two-dimensional granular materials under vertical vibration are studied by digital high speed photography. The steepen density and temperature wave fronts form near the plate as granular layer collides with vibrating plate and propagate upward through the layer. The temperature front is always in the transition region between the upward and downward granular flows. The effects of driving parameters and particle number on the shock are also explored.
Wave turbulence buildup in a vibrating plate
Auliel, Maria Ines; Mordant, Nicolas
2015-01-01T23:59:59.000Z
We report experimental and numerical results on the buildup of the energy spectrum in wave turbulence of a vibrating thin elastic plate. Three steps are observed: first a short linear stage, then the turbulent spectrum is constructed by the propagation of a front in wave number space and finally a long time saturation due to the action of dissipation. The propagation of a front at the second step is compatible with scaling predictions from the Weak Turbulence Theory.
Gravity waves from cosmic bubble collisions
Salem, Michael P.; Saraswat, Prashant; Shaghoulian, Edgar, E-mail: mpsalem@stanford.edu, E-mail: ps88@stanford.edu, E-mail: edgars@stanford.edu [Stanford Institute for Theoretical Physics and Department of Physics, Stanford University, Stanford, California 94305 (United States)
2013-02-01T23:59:59.000Z
Our local Hubble volume might be contained within a bubble that nucleated in a false vacuum with only two large spatial dimensions. We study bubble collisions in this scenario and find that they generate gravity waves, which are made possible in this context by the reduced symmetry of the global geometry. These gravity waves would produce B-mode polarization in the cosmic microwave background, which could in principle dominate over the inflationary background.
NONLINEAR WAVE EVOLUTION IN VLASOV PLASMA: A LIE-TRANSFORM ANALYSIS
Cary, J.R.
2010-01-01T23:59:59.000Z
Packets: The Meaning of Wave Energy and Momentum and theAnalyzing Wave Packets Wave Energy and Momentum Derivationa) . We f i r s t consider wave energy and wave momentum. We
NONLINEAR WAVE EVOLUTION IN VLASOV PLASMA: A LIE-TRANSFORM ANALYSIS
Cary, J.R.
2010-01-01T23:59:59.000Z
Packets: The Meaning of Wave Energy and Momentum and theAnalyzing Wave Packets Wave Energy and Momentum Derivationf i r s t consider wave energy and wave momentum. We prove
Compressional-wave and shear-wave velocities from long-spaced sonic waveforms
Lake, Leonard Cornelius
1986-01-01T23:59:59.000Z
COMPRESSIONAL-WAVE AND SHEAR-WAVE VELOCITIES FROM LONG- SPACED SONIC WAVEFORMS A Thesis LEONARD CORNELIUS LAKE Submitted to the Graduate College of Texas AdtM University in partial fulftllment of the requirements for thc degree of MASTER... OF SCIENCE Mav 19S6 Major Subject: Geophystcs COMPRESSIONAL-WAVE AND SHEAR-WAVE VELOCITIES FROM LONG- SPACED SONIC WAVEFORMS A Thesis LEONARD CORNELIUS LAKE Approved as to style and content by: erry W. neer (C)tairman of Commtttee) R bert. R. Unterb...
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.
Dispersion equation for water waves with vorticity and Stokes waves on flows with counter-currents
Vladimir Kozlov; Nikolay Kuznetsov
2014-06-05T23:59:59.000Z
The two-dimensional free-boundary problem of steady periodic waves with vorticity is considered for water of finite depth. We investigate how flows with small-amplitude Stokes waves on the free surface bifurcate from a horizontal parallel shear flow in which counter-currents may be present. Two bifurcation mechanisms are described: for waves with fixed Bernoulli's constant and fixed wavelength. In both cases the corresponding dispersion equations serve for defining wavelengths from which Stokes waves bifurcate. Sufficient conditions guaranteeing the existence of roots of these equations are obtained. Two particular vorticity distributions are considered in order to illustrate general results.
Nonlinear Lattice Waves in Random Potentials
Sergej Flach
2014-09-10T23:59:59.000Z
Localization of waves by disorder is a fundamental physical problem encompassing a diverse spectrum of theoretical, experimental and numerical studies in the context of metal-insulator transition, quantum Hall effect, light propagation in photonic crystals, and dynamics of ultra-cold atoms in optical arrays. Large intensity light can induce nonlinear response, ultracold atomic gases can be tuned into an interacting regime, which leads again to nonlinear wave equations on a mean field level. The interplay between disorder and nonlinearity, their localizing and delocalizing effects is currently an intriguing and challenging issue in the field. We will discuss recent advances in the dynamics of nonlinear lattice waves in random potentials. In the absence of nonlinear terms in the wave equations, Anderson localization is leading to a halt of wave packet spreading. Nonlinearity couples localized eigenstates and, potentially, enables spreading and destruction of Anderson localization due to nonintegrability, chaos and decoherence. The spreading process is characterized by universal subdiffusive laws due to nonlinear diffusion. We review extensive computational studies for one- and two-dimensional systems with tunable nonlinearity power. We also briefly discuss extensions to other cases where the linear wave equation features localization: Aubry-Andre localization with quasiperiodic potentials, Wannier-Stark localization with dc fields, and dynamical localization in momentum space with kicked rotors.
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.
Internal wave excitation by vertically-oscillating bodies
Flynn, Morris R.
://www.taylor.math.ualberta.ca/bruce/ p.2/38 #12;IGW in the environment Mountain Wave radiation Wind Wave breaking Drag force Atmosphere Breakdown of topographically-forced waves yields a zonal wind drag (Lindzen 1981, Fritts & Nastrom 1992 consider the wave structure associated with an oscillating sphere. p.4/38 #12;Laboratory modeling Sphere
Second harmonic electromagnetic emission via Langmuir wave coalescence
Melrose, Don
S of the pri- mary Langmuir waves L into product Langmuir waves L and ion-sound waves S. The kinematic of Langmuir waves at low wavenumbers. The number of such repeated backscatter decays is limited by kinematic upsteam of the Earth's bowshock.1315 An alternative mechanism to produce fundamental and harmonic
Wave spectral energy variability in the northeast Peter D. Bromirski
Bromirski, Peter D.
January 2005; published 8 March 2005. [1] The dominant characteristics of wave energy variability of monthly wave energy anomalies reveal that all three wave energy components exhibit similar patterns of spatial variability. The dominant mode represents coherent heightened (or diminished) wave energy along
Production of highly unidirectional lower-hybrid waves
McWilliams, R.; Okubo, M.; Platt, R.C.; Sheehan, D.P.
1985-01-01T23:59:59.000Z
The development of a highly unidirectional lower-hybrid wave source would improve the electron current drive efficiency in tokamaks. Lower-hybrid waves launched from a phased wave array are shown to be reflected from a grid placed in a cold, low-density plasma. The antenna--grid combination results in highly unidirectional lower-hybrid waves.
Toward a wave turbulence formulation of statistical nonlinear optics
Garnier, Josselin
Toward a wave turbulence formulation of statistical nonlinear optics Josselin Garnier,1, * Mietek optical waves have been reported in the literature. This article is aimed at providing a generalized wave, the process of optical wave thermalization to thermo- dynamic equilibrium, which slows down significantly
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
Propagation and Re ection of Internal Waves B. R. Sutherland
Sutherland, Bruce
the frequency spectrum of the waves. I INTRODUCTION An internal wave is a disturbance propagating under the e a level where the Doppler-shifted frequency of the waves is comparable with the background buoyancy frequency. Although linear theory predicts that the waves should re ect if the Doppler-shifted 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
Nonlinear three-wave interaction in marine sediments
Pushkina, N I
2015-01-01T23:59:59.000Z
Nonlinear interaction of three acoustic waves in a sandy sediment is studied in the frequency range where there is a considerable wave velocity dispersion. The possibility of an experimental observation of the generation of a sound wave by two pump waves propagating at an angle to each other is estimated.
Nonlinear three-wave interaction in marine sediments
N. I. Pushkina
2015-03-18T23:59:59.000Z
Nonlinear interaction of three acoustic waves in a sandy sediment is studied in the frequency range where there is a considerable wave velocity dispersion. The possibility of an experimental observation of the generation of a sound wave by two pump waves propagating at an angle to each other is estimated.
Wave Energy Development in Oregon Licensing & Permitting Requirements
July 09 Wave Energy Development in Oregon Licensing & Permitting Requirements Prepared by Pacific Energy Ventures on behalf of the Oregon Wave Energy Trust w w w . o r e g o n w a v e . o r g #12;This study was commissioned by Oregon Wave Energy Trust. Oregon Wave Energy Trust is funded by the Oregon
Numerical simulation of tsunami waves generated by deformable submarine landslides
Kirby, James T.
Numerical simulation of tsunami waves generated by deformable submarine landslides Gangfeng Ma a wave model Tsunami wave Numerical modeling a b s t r a c t This paper presents a new submarine of landslide motion and associated tsunami wave generation on parameters including sediment settling velocity
A DISCRETE WAVELET ANALYSIS OF FREAK WAVES IN THE OCEAN
A DISCRETE WAVELET ANALYSIS OF FREAK WAVES IN THE OCEAN EN-BING LIN AND PAUL C. LIU Received 25 wavelet analysis on a freak wave. We demonstrate several applications of wavelets and discrete and continuous wavelet transforms on the study of a freak wave. A modeling setting for freak waves will also
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
A Wave Analysis of the Subset Sum Problem Mark Jelasity
Jelasity, Márk
A Wave Analysis of the Subset Sum Problem M´ark Jelasity Research Group of Artificial Intelligence the wave model, a novel approach on analyzing the behavior of GAs. Our aim is to give techniques that have and effective heuristics on certain problem classes. The wave analysis is the process of building wave models
Gravity Wave Lensing Ryan Elandt, Mostafa Shakeri & Reza Alam
Alam, Mohammad-Reza
Gravity Wave Lensing Ryan Elandt, Mostafa Shakeri & Reza Alam Department of Mechanical Engineering waves caused by small seabed features (the so called Bragg resonance) can be utilized to create equivalent of lenses and curved mirrors for surface gravity waves. Such gravity wave lenses, which are merely
Tyler, Robert Cory
2013-09-28T23:59:59.000Z
the signal transmission from the computer to the flume control panel. Profile The profile, seen in Figure 5, that was designed for testing is representative of the last measurement made of the West End of Galveston, TX before Hurricane Ike. The sand....046 65.80 20 0.044 63.09 40 0.040 57.22 60 0.038 54.66 Results of Table 10 show that the dune did have a reduction in erosion. In the initial 5min the dune lost 31% of its volume. There was little difference between 10 and 20mins with 66 and 63...
The Preliminary Guides to the MegaWave2 Software, Versions 2.x MegaWave2 System Library
The Preliminary Guides to the MegaWave2 Software, Versions 2.x Volume Two MegaWave2 System Library;Contents MegaWave2 System Library Contents 2 Contents 1 Introduction 6 1.1 What you will find in this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2 The MegaWave2 memory (internal) types . . . . . . . . . . . . . . . . . . . . . . 6 1.3 File
Wright, Dawn Jeannine
Wave Energy Ecological Effects Workshop page 1 of 4 Ecological Effects of Wave Energy Development the capacity to harvest wave energy off its coast as a clean, renewable resource. An important part of moving this agenda forward must include understanding the potential effects of wave energy technology
Geddes, Cameron Guy Robinson
Warm wave breaking of nonlinear plasma waves with arbitrary phase velocities C. B. Schroeder, E, collisionless plasma is developed to analyze nonlinear plasma waves excited by intense drive beams. The maximum amplitude and wavelength are calculated for nonrelativistic plasma temperatures and arbitrary plasma wave
Wave EnergyFocusing in aThree-dimensional Numerical WaveTank C. Fochesato*, F. Dias**, S. Grilli***
Grilli, Stéphan T.
Wave EnergyFocusing in aThree-dimensional Numerical WaveTank C. Fochesato*, F. Dias**, S. Grilli Department (University of Rhode Island), Narragansett, RI, U.S.A. ABSTRACT Directional wave energy focusing in space is one of the mechanisms that may contribute to the generation of a rogue wave in the ocean
Wave attenuation over coastal salt marshes under storm surge conditions
Möller, Iris; Kudella, Matthias; Rupprecht, Franziska; Spencer, Tom; Paul, Maike; van Wesenbeeck, Bregje K.; Wolters, Guido; Jensen, Kai; Bouma, Tjeerd J.; Miranda-Lange, Martin; Schimmels, Stefan
2014-09-29T23:59:59.000Z
submerged salt marsh canopies is 43 dependent on water depth and incident wave energy, and that hydrodynamic conditions may exist 44 beyond which marshes lose their wave dissipating effect6,17,18. The existence of such conditions 45 makes intuitive sense... , as the orbital wave motion that is affected by the submerged vegetation 46 canopy decreases with increasing depth and decreasing incident wave energy. Existing empirical 47 studies of wave reduction over vegetated canopies have, however, been limited to low...
Wave packet dynamics of the matter wave field of a Bose-Einstein condensate
C. Sudheesh; S. Lakshmibala; V. Balakrishnan
2004-08-11T23:59:59.000Z
We show in the framework of a tractable model that revivals and fractional revivals of wave packets afford clear signatures of the extent of departure from coherence and from Poisson statistics of the matter wave field in a Bose-Einstein condensate, or of a suitably chosen initial state of the radiation field propagating in a Kerr-like medium.
Uniform WKB approximation of Coulomb wave functions for arbitrary partial wave
N. Michel
2008-12-12T23:59:59.000Z
Coulomb wave functions are difficult to compute numerically for extremely low energies, even with direct numerical integration. Hence, it is more convenient to use asymptotic formulas in this region. It is the object of this paper to derive analytical asymptotic formulas valid for arbitrary energies and partial waves. Moreover, it is possible to extend these formulas for complex values of parameters.
Nonlinear waves and coherent structures in the quantum single-wave model
Tzenov, Stephan I. [Department of Physics, Lancaster University, Lancaster LA1 4YB (United Kingdom); Marinov, Kiril B. [ASTeC, STFC Daresbury Laboratory, Keckwick Lane, Daresbury WA4 4AD (United Kingdom)
2011-10-15T23:59:59.000Z
Starting from the von Neumann-Maxwell equations for the Wigner quasi-probability distribution and for the self-consistent electric field, the quantum analog of the classical single-wave model has been derived. The linear stability of the quantum single-wave model has been studied, and periodic in time patterns have been found both analytically and numerically. In addition, some features of quantum chaos have been detected in the unstable region in parameter space. Further, a class of standing-wave solutions of the quantum single-wave model has also been found, which have been observed to behave as stable solitary-wave structures. The analytical results have been finally compared to the exact system dynamics obtained by solving the corresponding equations in Schrodinger representation numerically.
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
Carver Mead
2015-03-16T23:59:59.000Z
Gravitational coupling of the propagation four-vectors of matter wave functions is formulated in flat space-time. Coupling at the momentum level rather than at the "force-law" level greatly simplifies many calculations. This locally Lorentz-invariant approach (G4v) treats electromagnetic and gravitational coupling on an equal footing. Classical mechanics emerges from the incoherent aggregation of matter wave functions. The theory reproduces, to first order beyond Newton, the standard GR results for Gravity-Probe B, deflection of light by massive bodies, precession of orbits, gravitational red shift, and total gravitational-wave energy radiated by a circular binary system. Its predictions of total radiated energy from highly eccentric Kepler systems are slightly larger than those of similar GR treatments. G4v predictions differ markedly from those of GR for the gravitational-wave radiation patterns from rotating massive systems, and for the LIGO antenna pattern. The predicted antenna patterns have been shown to be highly distinguishable in the case of continuous gravitational-wave sources, and should therefore be testable as data from Advanced LIGO becomes available over the next few years.
Local Runup Amplification By Resonant Wave Interactions
Stefanakis, Themistoklis; Dutykh, Denys
2011-01-01T23:59:59.000Z
Until now the analysis of long wave runup on a plane beach has been focused on finding its maximum value, failing to capture the existence of resonant regimes. One-dimensional numerical simulations in the framework of the Nonlinear Shallow Water Equations (NSWE) are used to investigate the Boundary Value Problem (BVP) for plane and non-trivial beaches. Monochromatic waves, as well as virtual wave-gage recordings from real tsunami simulations, are used as forcing conditions to the BVP. Resonant phenomena between the incident wavelength and the beach slope are found to occur, which result in enhanced runup of non-leading waves. The evolution of energy reveals the existence of a quasi-periodic state for the case of sinusoidal waves, the energy level of which, as well as the time required to reach that state, depend on the incident wavelength for a given beach slope. Dispersion is found to slightly reduce the value of maximum runup, but not to change the overall picture. Runup amplification occurs for both leadin...
The evolution of oscillator wave functions
Mark Andrews
2015-09-20T23:59:59.000Z
We consider some of the methods that can be used to reveal the general features of how wave functions evolve with time in the harmonic oscillator. We first review the periodicity properties over each multiple of a quarter of the classical period of oscillation. Then we show that any wave function can be simply transformed so that its centroid, defined by the expectation values of position and momentum, remains at rest at the center of the oscillator. This implies that we need only consider the evolution of this restricted class of wave functions; the evolution of all others can be reduced to these. The evolution of the spread in position $\\Delta_x$ and momentum $\\Delta_p$ throws light on energy and uncertainty and on squeezed and coherent states. Finally we show that any wave function can be transformed so that $\\Delta_x$ and $\\Delta_p$ do not change with time and that the evolution of all wave functions can easily be found from the evolution of those at rest at the origin with unchanging $\\Delta_x$ and $\\Delta_p$.
Fast Computation Algorithm for Discrete Resonances among Gravity Waves
Elena Kartashova
2006-05-25T23:59:59.000Z
Traditionally resonant interactions among short waves, with large real wave-numbers, were described statistically and only a small domain in spectral space with integer wave-numbers, discrete resonances, had to be studied separately in resonators. Numerical simulations of the last few years showed unambiguously the existence of some discrete effects in the short-waves part of the wave spectrum. Newly presented model of laminated turbulence explains theoretically appearance of these effects thus putting a novel problem - construction of fast algorithms for computation of solutions of resonance conditions with integer wave-numbers of order $10^3$ and more. Example of such an algorithm for 4-waves interactions of gravity waves is given. Its generalization on the different types of waves is briefly discussed.
Microfabricated bulk wave acoustic bandgap device
Olsson, Roy H.; El-Kady, Ihab F.; McCormick, Frederick; Fleming, James G.; Fleming, Carol
2010-06-08T23:59:59.000Z
A microfabricated bulk wave acoustic bandgap device comprises a periodic two-dimensional array of scatterers embedded within the matrix material membrane, wherein the scatterer material has a density and/or elastic constant that is different than the matrix material and wherein the periodicity of the array causes destructive interference of the acoustic wave within an acoustic bandgap. The membrane can be suspended above a substrate by an air or vacuum gap to provide acoustic isolation from the substrate. The device can be fabricated using microelectromechanical systems (MEMS) technologies. Such microfabricated bulk wave phononic bandgap devices are useful for acoustic isolation in the ultrasonic, VHF, or UHF regime (i.e., frequencies of order 1 MHz to 10 GHz and higher, and lattice constants of order 100 .mu.m or less).
Microfabricated bulk wave acoustic bandgap device
Olsson, Roy H. (Albuquerque, NM); El-Kady, Ihab F. (Albuquerque, NM); McCormick, Frederick (Albuquerque, NM); Fleming, James G. (Albuquerque, NM); Fleming, legal representative, Carol (Albuquerque, NM)
2010-11-23T23:59:59.000Z
A microfabricated bulk wave acoustic bandgap device comprises a periodic two-dimensional array of scatterers embedded within the matrix material membrane, wherein the scatterer material has a density and/or elastic constant that is different than the matrix material and wherein the periodicity of the array causes destructive interference of the acoustic wave within an acoustic bandgap. The membrane can be suspended above a substrate by an air or vacuum gap to provide acoustic isolation from the substrate. The device can be fabricated using microelectromechanical systems (MEMS) technologies. Such microfabricated bulk wave phononic bandgap devices are useful for acoustic isolation in the ultrasonic, VHF, or UHF regime (i.e., frequencies of order 1 MHz to 10 GHz and higher, and lattice constants of order 100 .mu.m or less).
Interferometry with correlated matter-waves
Oksana I. Streltsova; Alexej I. Streltsov
2014-12-12T23:59:59.000Z
Matter-wave interferometry of ultra-cold atoms with attractive interactions is studied at the full many-body level. First, we study how a coherent light-pulse applied to an initially-condensed solitonic system splits it into two matter-waves. The split system looses its coherence and develops correlations with time, and inevitably becomes fragmented due to inter-particle attractions. Next, we show that by re-colliding the sub-clouds constituting the split density together, along with a simultaneous application of the same laser-pulse, one creates three matter-waves propagating with different momenta. We demonstrate that the number of atoms in the sub-cloud with zero-momentum is directly proportional to the degree of fragmentation in the system. This interferometric-based protocol to discriminate, probe, and measure the fragmentation is general and can be applied to ultra-cold systems with attractive, repulsive, short- and long-range interactions.
Active micromixer using surface acoustic wave streaming
Branch; Darren W. (Albuquerque, NM), Meyer; Grant D. (Ithaca, NY), Craighead; Harold G. (Ithaca, NY)
2011-05-17T23:59:59.000Z
An active micromixer uses a surface acoustic wave, preferably a Rayleigh wave, propagating on a piezoelectric substrate to induce acoustic streaming in a fluid in a microfluidic channel. The surface acoustic wave can be generated by applying an RF excitation signal to at least one interdigital transducer on the piezoelectric substrate. The active micromixer can rapidly mix quiescent fluids or laminar streams in low Reynolds number flows. The active micromixer has no moving parts (other than the SAW transducer) and is, therefore, more reliable, less damaging to sensitive fluids, and less susceptible to fouling and channel clogging than other types of active and passive micromixers. The active micromixer is adaptable to a wide range of geometries, can be easily fabricated, and can be integrated in a microfluidic system, reducing dead volume. Finally, the active micromixer has on-demand on/off mixing capability and can be operated at low power.
Gravitational waves and gamma-ray bursts
Alessandra Corsi; for the LIGO Scientific Collaboration; for the Virgo Collaboration
2012-05-11T23:59:59.000Z
Gamma-Ray Bursts are likely associated with a catastrophic energy release in stellar mass objects. Electromagnetic observations provide important, but indirect information on the progenitor. On the other hand, gravitational waves emitted from the central source, carry direct information on its nature. In this context, I give an overview of the multi-messenger study of gamma-ray bursts that can be carried out by using electromagnetic and gravitational wave observations. I also underline the importance of joint electromagnetic and gravitational wave searches, in the absence of a gamma-ray trigger. Finally, I discuss how multi-messenger observations may probe alternative gamma-ray burst progenitor models, such as the magnetar scenario.
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.
Wave turbulence served up on a plate
Pablo Cobelli; Philippe Petitjeans; Agnes Maurel; Vincent Pagneux; Nicolas Mordant
2009-10-28T23:59:59.000Z
Wave turbulence in a thin elastic plate is experimentally investigated. By using a Fourier transform profilometry technique, the deformation field of the plate surface is measured simultaneously in time and space. This enables us to compute the wavevector-frequency Fourier ($\\mathbf k, \\omega$) spectrum of the full space-time deformation velocity. In the 3D ($\\mathbf k, \\omega$) space, we show that the energy of the motion is concentrated on a 2D surface that represents a nonlinear dispersion relation. This nonlinear dispersion relation is close to the linear dispersion relation. This validates the usual wavenumber-frequency change of variables used in many experimental studies of wave turbulence. The deviation from the linear dispersion, which increases with the input power of the forcing, is attributed to weak non linear effects. Our technique opens the way for many new extensive quantitative comparisons between theory and experiments of wave turbulence.
Grilli, Stéphan T.
Ocean Waves Measurement and Analysis, Fifth International Symposium WAVES 2005, 3rd-7th, July, 2005 WAVES 2005, 3rd-7th, July, 2005. Madrid, Spain #12;Ocean Waves Measurement and Analysis, Fifth International Symposium WAVES 2005, 3rd-7th, July, 2005. Madrid, Spain #12;Ocean Waves Measurement and Analysis
Electromagnetic wave scattering by small bodies
A. G. Ramm
2008-04-21T23:59:59.000Z
A reduction of the Maxwell's system to a Fredholm second-kind integral equation with weakly singular kernel is given for electromagnetic (EM) wave scattering by one and many small bodies. This equation is solved asymptotically as the characteristic size of the bodies tends to zero. The technique developed is used for solving the many-body EM wave scattering problem by rigorously reducing it to solving linear algebraic systems, completely bypassing the usage of integral equations. An equation is derived for the effective field in the medium, in which many small particles are embedded. A method for creating a desired refraction coefficient is outlined.
Gravitational waves induced by spinor fields
Feng, Kaixi
2015-01-01T23:59:59.000Z
In realistic model-building, spinor fields with various masses are present. During inflation, spinor field may induce gravitational waves as a second order effect. In this paper, we calculate the contribution of single massive spinor field to the power spectrum of primordial gravitational wave by using retarded Green propagator. We find that the correction is scale-invariant and of order $H^4/M_P^4$ for arbitrary spinor mass $m_{\\psi}$. Additionally, we also observe that when $m_\\psi \\gtrsim H$, the dependence of correction on $m_\\psi/H$ is nontrivial.
Wave-Driven Rotation In Centrifugal Mirrors
Abraham J. Fetterman and Nathaniel J. Fisch
2011-03-28T23:59:59.000Z
Centrifugal mirrors use supersonic rotation to provide axial confinement and enhanced stability. Usually the rotation is produced using electrodes, but these electrodes have limited the rotation to the Alfven critical ionization velocity, which is too slow to be useful for fusion. Instead, the rotation could be produced using radio frequency waves. A fixed azimuthal ripple is a simple and efficient wave that could produce rotation by harnessing alpha particle energy. This is an extension of the alpha channeling effect. The alpha particle power and efficiency in a simulated devices is sufficient to produce rotation without external energy input. By eliminating the need for electrodes, this opens new opportunities for centrifugal traps.
Gravitational wave energy spectrum of hyperbolic encounters
De Vittori, Lorenzo; Klein, Antoine
2012-01-01T23:59:59.000Z
The emission of gravitational waves is studied for a system of massive objects interacting on hyperbolic orbits within the quadrupole approximation following the work of Capozziello et al. Here we focus on the derivation of an analytic formula for the energy spectrum of the emitted waves. We checked numerically that our formula is in agreement with the two limiting cases for which results were already available: for the eccentricity {\\epsilon} = 1, the parabolic case whose spectrum was computed by Berry and Gair, and the large {\\epsilon} limit with the formula given by Turner.
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.
Gravitational wave energy spectrum of hyperbolic encounters
Lorenzo De Vittori; Philippe Jetzer; Antoine Klein
2012-07-23T23:59:59.000Z
The emission of gravitational waves is studied for a system of massive objects interacting on hyperbolic orbits within the quadrupole approximation following the work of Capozziello et al. Here we focus on the derivation of an analytic formula for the energy spectrum of the emitted waves. We checked numerically that our formula is in agreement with the two limiting cases for which results were already available: for the eccentricity {\\epsilon} = 1, the parabolic case whose spectrum was computed by Berry and Gair, and the large {\\epsilon} limit with the formula given by Turner.
Soft Capacitors for Wave Energy Harvesting
Karsten Ahnert; Markus Abel; Matthias Kollosche; Per Jørgen Jørgensen; Guggi Kofod
2011-10-14T23:59:59.000Z
Wave energy harvesting could be a substantial renewable energy source without impact on the global climate and ecology, yet practical attempts have struggle d with problems of wear and catastrophic failure. An innovative technology for ocean wave energy harvesting was recently proposed, based on the use of soft capacitors. This study presents a realistic theoretical and numerical model for the quantitative characterization of this harvesting method. Parameter regio ns with optimal behavior are found, and novel material descriptors are determined which simplify analysis dramatically. The characteristics of currently ava ilable material are evaluated, and found to merit a very conservative estimate of 10 years for raw material cost recovery.
Roberts, Jesse D.; Chang, Grace; Jones, Craig
2014-09-01T23:59:59.000Z
The numerical model, SWAN (Simulating WAves Nearshore) , was used to simulate wave conditions in Kaneohe Bay, HI in order to determine the effects of wave energy converter ( WEC ) devices on the propagation of waves into shore. A nested SWAN model was validated then used to evaluate a range of initial wave conditions: significant wave heights (H s ) , peak periods (T p ) , and mean wave directions ( MWD) . Differences between wave height s in the presence and absence of WEC device s were assessed at locations in shore of the WEC array. The maximum decrease in wave height due to the WEC s was predicted to be approximately 6% at 5 m and 10 m water depths. Th is occurred for model initiation parameters of H s = 3 m (for 5 m water depth) or 4 m (10 m water depth) , T p = 10 s, and MWD = 330deg . Subsequently, bottom orbital velocities were found to decrease by about 6%.
Craig, Walter
Design of early warning systems (or some of its components) including modeling in faster than real time dynamics Conclusions Tsunamis and ocean waves Walter Craig Department of Mathematics & Statistics AAAS Annual Meeting St. Louis Missouri February 19, 2006 Walter Craig McMaster University Tsunamis and ocean
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
Multi-scale interaction of driftWave turbulence with large scale shear flows
McDevitt, Christopher J.
2008-01-01T23:59:59.000Z
then to impose outgoing wave energy boundary conditions [Appendix A, this outgoing wave energy condition implies thatMHD. Appendix A: Outgoing Wave Energy Boundary Conditions In
High-Efficiency and High-Power CMOS Power Amplifiers for Millimeter-Wave Applications /
Agah, Amir
2013-01-01T23:59:59.000Z
of stacked-FET millimeter-wave power amplifiers,” IEEECMOS Millimeter-Wave Power Amplifiers .dual-path, millimeter-wave power amplifier with 20 dBm
Design of millimeter-wave power amplifiers using InP heterojunction bipolar transistors
O'Sullivan, Tomás
2009-01-01T23:59:59.000Z
3 Design of Millimeter-wave Power Cells . . . . . . . . . .4.1 Millimeter-wave Power Amplifiersetup for millimeter-wave power sweeps . . . . . . 87 Figure
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
Power Maximization in Wave-Energy Converters Using Sampled -Data Extremum Seeking /
Chen, Tianjia
2013-01-01T23:59:59.000Z
Power Maximization in Wave-Energy Converters Using Sampled-design optimization of wave energy converters con- sistingN. Sahinkaya. A review of wave energy converter technology.
Anomalous electron-ion energy coupling in electron drift wave turbulence
Zhao, Lei
annulus arises due to a wave energy flux differential acrossprincipal collisionless wave energy dissipation channel inOn the other hand, wave energy can be dissipated by ion
Climate modulates internal wave activity in the Northern South China Sea
Decarlo, TM; Karnauskas, KB; Davis, KA; Wong, GTF
2015-01-01T23:59:59.000Z
Energy of nonlinear internal waves in the South China Sea,the nonlinear internal wave climate in the northeasternlarge amplitude internal waves, Mar. Ecol. Prog. Ser. , 412,
Wave breaking along the stratospheric polar vortex as seen in ERA-40 data
Abatzoglou, John T; Magnusdottir, Gudrun
2007-01-01T23:59:59.000Z
1983), Breaking planetary waves in the stratosphere, Nature,structure of breaking Rossby waves in the polar wintertimecontrol of upward wave flux near the tropopause, Geophys.
WAVE TRANSMISSION AND MOORING-FORCE CHARACTERISTICS OF PIPE-TIRE FLOATING BREAKWATERS
Harms, Volker W.
2013-01-01T23:59:59.000Z
Facility and Instrumentation a. Wave Tank . b. Have Gauge c.Procedures Experimental Results Wave~Transmission Data Page112 Appendix C - Detailed Wave-Transmission Diagrams . 121
The TE Wave Transmission Method for Electron Cloud Measurements at Cesr-TA
Desantis, S.
2010-01-01T23:59:59.000Z
CBP-836 THE TE WAVE TRANSMISSION METHOD FOR ELECTRON CLOUDon the optimization of TE Wave measurements at the Cesr-TALinear Collider. The TE Wave measurement method utilizes
Miguel Onorato; Davide Proment
2012-03-21T23:59:59.000Z
We consider the effect of the wind and the dissipation on the nonlinear stages of the modulational instability. By applying a suitable transformation, we map the forced/damped Nonlinear Schr\\"odinger (NLS) equation into the standard NLS with constant coefficients. The transformation is valid as long as |{\\Gamma}t| \\ll 1, with {\\Gamma} the growth/damping rate of the waves due to the wind/dissipation. Approximate rogue wave solutions of the equation are presented and discussed. The results shed some lights on the effects of wind and dissipation on the formation of rogue waves.
Flume Studies of Sediment Transportation in Shallow Flow with Simulated Rainfall
Nail, F.M.
1966-01-01T23:59:59.000Z
, Trinity, Neches and Sabine River Basins," is a general discussion of the economic factors as they are related to demand for water in each basin. In addition to a statewide outlook, a separate discussion for each basin is presented which includes future...
Environmental Effects of Hydrokinetic Turbines on Fish: Desktop and Laboratory Flume Studies, 2012
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.pdfServiceDepartment ofEnergyPlus Overcomes2 DOEDepartmentThird Annual Report
Moherek, Anthony Joseph
1977-01-01T23:59:59.000Z
dredged material discharge sites and two reference areas (Block 15 and Block 27) which served as control sites for sediment sampling operations. The G. O. M, D. S. was divided into 28 individual 0. 8 km square blocks in order to facilitate sample..., from Folk (1974) are as follows: M = Graphic Mean z ~16 + 58 84 3 (6) 4 = Inclusive Graph1c Standard Dev1ation I ~84 - 16 ~495 - 5 4 6. 6 Sk = Inclusive Graph1c Skewness I 16+ 84-2 50 i 5+ 95-2'50 2 484 ? 416 2 495 - 45 (8) Justification...
Moherek, Anthony Joseph
1977-01-01T23:59:59.000Z
experiments indicated that the four sediment mixtures erode similarly as evidenced by the same critical bed shear (Tp a 1 ~ 0 dynes/cm ). necessary to induce massive bedload transport and rapid suspended sediment increases. Significant deposition... of suspended fine silt and clay occurred at low bed shears (~o & 0. 2 dynes/cma). Extrapolation of these erosion and deposition bed shears to recorded offshore bottom current speed measurements over month-long periods suggest that bed- load erosion occurs...
A prediction of meander migration based on large-scale flume tests in clay
Park, Namgyu
2009-05-15T23:59:59.000Z
Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Co-Chairs of Committee, Jean-Louis Briaud Kuang-An Chang Committee Members, Hamn-Ching Chen Christopher C...
Autoresonant propagation of incoherent light-waves
Friedland, Lazar
. Yariv, Quantum Electronics, 3rd ed. (Wiley, New York, 1989). 5. S. Somekh, and A. Yariv, "Phasematchable, "Nonlinear Coupling of Waveguide Modes," Appl. Phys. Lett. 50(13), 801 803 (1987). 2. O. Cohen, X. Zhang, A, "Spatial Four Wave Mixing in Nonlinear Periodic Structures," Phys. Rev. Lett. 97(7), 073906 (2006). 4. A
November 2012 Wave propagation in complex media,
Snieder, Roel
of the novel multi-component marine seismic data which have recently been available for offshore exploration to seismic imaging Advisor: Prof. Roel Snieder Committee Members: Prof. Thomas Furtak Prof. Yaoguo Li Prof on September 5, 2012 #12;#12;WAVE PROPAGATION IN COMPLEX MEDIA, SCATTERING THEORY, AND APPLICATION TO SEISMIC
Pointwise Fourier Inversion: a Wave Equation Approach
Pointwise Fourier Inversion: a Wave Equation Approach Mark A. Pinsky1 Michael E. Taylor2. A general criterion for pointwise Fourier inversion 2. Pointwise Fourier inversion on Rn (n = 3) 3. Fourier inversion on R2 4. Fourier inversion on Rn (general n) 5. Fourier inversion on spheres 6. Fourier inversion
Pointwise Fourier Inversion: a Wave Equation Approach
Pointwise Fourier Inversion: a Wave Equation Approach Mark A. Pinsky 1 Michael E. Taylor 2. A general criterion for pointwise Fourier inversion 2. Pointwise Fourier inversion on R n (n = 3) 3. Fourier inversion on R 2 4. Fourier inversion on R n (general n) 5. Fourier inversion on spheres 6. Fourier
Currents driven by electron cyclotron waves
Karney, C.F.F.; Fisch, N.J.
1981-07-01T23:59:59.000Z
Certain aspects of the generation of steady-state currents by electron cyclotron waves are explored. A numerical solution of the Fokker-Planck equation is used to verify the theory of Fisch and Boozer and to extend their results into the nonlinear regime. Relativistic effects on the current generated are discussed. Applications to steady-state tokamak reactors are considered.
Magnetically excited flexural plate wave apparatus
Martin, Stephen J. (Albuquerque, NM); Butler, Michael A. (Albuquerque, NM); Frye, Gregory C. (Cedar Crest, NM); Smith, James H. (Albuquerque, NM)
1998-01-01T23:59:59.000Z
A non-piezoelectric flexural plate wave apparatus having meander-line transducers mounted on a non-piezoelectric membrane. A static magnetic field is directed perpendicularly to the conductive legs of the transducers in the plane of the membrane. Single-port, two-port, resonant, non-resonant, eigenmode, and delay-line modes may be employed.
Spectroscopic measurement of an atomic wave function
Kapale, KT; Qamar, S.; Zubairy, M. Suhail.
2003-01-01T23:59:59.000Z
We present a simple spectroscopic method based on Autler-Townes spectroscopy to determine the center-of-mass atomic wave function. The detection of spontaneously emitted photons from a three-level atom, in which two upper levels are driven by a...
METACHRONAL WAVE GAIT GENERATION FOR HEXAPOD ROBOTS
Parker, Gary B.
METACHRONAL WAVE GAIT GENERATION FOR HEXAPOD ROBOTS GARY B. PARKER and JONATHAN W. MILLS Department: genetic, robot, hexapod, gait, control, cyclic, metachronal INTRODUCTION Generating gaits is important have been used to evolve gaits for hexapod robots. Those striving for maximum speed have been used
Conformal Partial Waves: Further Mathematical Results
Dolan, F A
2011-01-01T23:59:59.000Z
Further results for conformal partial waves for four point functions for conformal primary scalar fields in conformally invariant theories are obtained. They are defined as eigenfunctions of the differential Casimir operators for the conformal group acting on two variable functions subject to appropriate boundary conditions. As well as the scale dimension $\\Delta$ and spin $\\ell$ the conformal partial waves depend on two parameters $a,b$ related to the dimensions of the operators in the four point function. Expressions for the Mellin transform of conformal partial waves are obtained in terms of polynomials of the Mellin transform variables given in terms of finite sums. Differential operators which change $a,b$ by $\\pm 1$, shift the dimension $d$ by $\\pm 2$ and also change $\\Delta,\\ell$ are found. Previous results for $d=2,4,6$ are recovered. The trivial case of $d=1$ and also $d=3$ are also discussed. For $d=3$ formulae for the conformal partial waves in some restricted cases as a single variable integral re...
Shock wave absorber having a deformable liner
Youngdahl, C.K.; Wiedermann, A.H.; Shin, Y.W.; Kot, C.A.; Ockert, C.E.
1983-08-26T23:59:59.000Z
This invention discloses a shock wave absorber for a piping system carrying liquid. The absorber has a plastically deformable liner defining the normal flow boundary for an axial segment of the piping system, and a nondeformable housing is spaced outwardly from the liner so as to define a gas-tight space therebetween. The flow capacity of the liner generally corresponds to the flow capacity of the piping system line, but the liner has a noncircular cross section and extends axially of the piping system line a distance between one and twenty times the diameter thereof. Gas pressurizes the gas-tight space equal to the normal liquid pressure in the piping system. The liner has sufficient structural capacity to withstand between one and one-half and two times this normal liquid pressures; but at greater pressures it begins to plastically deform initially with respect to shape to a more circular cross section, and then with respect to material extension by circumferentially stretching the wall of the liner. A high energy shock wave passing through the liner thus plastically deforms the liner radially into the gas space and progressively also as needed in the axial direction of the shock wave to minimize transmission of the shock wave beyond the absorber.
THE UNIVERSITY OF EDINBURGH, Flo, Wave Building,
Edinburgh, University of
. Entrance 1, Page 9. Reception, Page 10. Lifts. Page 10. Platform Lifts. Page 10. Stairs, Page 10. Toilets's Buildings campus; this campus is well served by public transport and is accessible by car. The building disabled parking bay located within the Flo, Wave building car park. This disabled parking bay is located
Wavelet Spectrum Analysis and Ocean Wind Waves
Wavelet Spectrum Analysis and Ocean Wind Waves Paul C. Liu Abstract. Wavelet spectrum analysis characteristics. These insights are due to the nature of the wavelet transform that would not be immediately or decay, is Wavelets in Geophysics 151 Efi Foufoula-Georgiou and Praveen Kumar (eds.), pp. 151-166. ISBN 0
5G Millimeter Wave Channel Model Alliance
5G Millimeter Wave Channel Model Alliance There is an industry and research community need Alliance of companies, academia, and government organizations to support the development of more accurate, consis- tent, and predictive channel models. To facilitate the formation of this Alliance, NIST plans
On the Vacuum Propagation of Gravitational Waves
Xiao Liu
2007-06-05T23:59:59.000Z
We show that, for any local, causal quantum field theory which couples covariantly to gravity, and which admits Minkowski spacetime vacuum(a) invariant under the inhomogeneous proper orthochronous Lorentz group, plane gravitational waves propagating in such Minkowski vacuum(a) do not dissipate energy or momentum via quantum field theoretic effects.
Pressure wave charged repetitively pulsed gas laser
Kulkarny, Vijay A. (Redondo Beach, CA)
1982-01-01T23:59:59.000Z
A repetitively pulsed gas laser in which a system of mechanical shutters bracketing the laser cavity manipulate pressure waves resulting from residual energy in the cavity gas following a lasing event so as to draw fresh gas into the cavity and effectively pump spent gas in a dynamic closed loop.
p-wave superconductors in dilaton gravity
ZhongYing Fan
2013-10-08T23:59:59.000Z
In this paper, we study peculiar properties of p-wave superconductors in dilaton gravity. The scale invariance of the bulk geometry is effectively broken due to the existence of dilaton. By coupling the dilaton to the non-Abelian gauge field, i.e., $-\\frac14 e^{-\\beta \\Phi} F^a_{\\mu\
The wave function of a gravitating shell
V. I. Dokuchaev; S. V. Chernov
2010-10-01T23:59:59.000Z
We have calculated a discrete spectrum and found an exact analytical solution in the form of Meixner polynomials for the wave function of a thin gravitating shell in the Reissner-Nordstrom geometry. We show that there is no extreme state in the quantum spectrum of the gravitating shell, as in the case of extreme black hole.
Hybrid wave model and its applications
Yang, Jun
1998-01-01T23:59:59.000Z
forces. The sensitivity of wave forces to the cutoff frequency, that was found by Hu et al. (1995), is caused by the divergence of the MCM for broad-band and relatively steep spectra. Based on the analysis and simulation, vital conclusions...
Thermal diffusion shock waves Sorasak Danworaphong1
Craig, Walter
Thermal diffusion shock waves Sorasak Danworaphong1 , Walter Craig3 , Vitalyi Gusev4 , and Gerald J and are concentrated by a thermal gradient imposed on a salt solution, the separation of the components of a mixture in a thermal field, known as "thermal diffusion", or the Ludwig-Soret effect has been found not only in liquids
Environmental Data Collection Using Autonomous Wave Gliders
·Created by LRI in 2007 ·Wave-powered 1.5 kts average 1 year endurance! ·Two empty payload bays model AIRMAR PB200 weather station Pressure, Temperature, Wind Speed and Direction 10 min averaged Temperature Relative humidity Vaisala Weather Transmitter WTX520 Wind speed and direction Barometric pressure
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.
Modeling Kelvin Wave Cascades in Superfluid Helium
Guido Boffetta; Antonio Celani; Davide Dezzani; Jason Laurie; Sergey Nazarenko
2009-11-10T23:59:59.000Z
We study two different types of simplified models for Kelvin wave turbulence on quantized vortex lines in superfluids near zero temperature. Our first model is obtained from a truncated expansion of the Local Induction Approximation (Truncated-LIA) and it is shown to possess the same scalings and the essential behaviour as the full Biot-Savart model, being much simpler than the latter and, therefore, more amenable to theoretical and numerical investigations. The Truncated-LIA model supports six-wave interactions and dual cascades, which are clearly demonstrated via the direct numerical simulation of this model in the present paper. In particular, our simulations confirm presence of the weak turbulence regime and the theoretically predicted spectra for the direct energy cascade and the inverse wave action cascade. The second type of model we study, the Differential Approximation Model (DAM), takes a further drastic simplification by assuming locality of interactions in $k$-space via a differential closure that preserves the main scalings of the Kelvin wave dynamics. DAMs are even more amenable to study and they form a useful tool by providing simple analytical solutions in the cases when extra physical effects are present, e.g. forcing by reconnections, friction dissipation and phonon radiation. We study these models numerically and test their theoretical predictions, in particular the formation of the stationary spectra, and the closeness of the numerics for the higher-order DAM to the analytical predictions for the lower-order DAM .
PNNL Expert Doug McMakin Discusses Millimeter Wave Technology
Doug McMakin
2012-12-31T23:59:59.000Z
Electrical Engineer Doug McMakin discusses Millimeter Wave Holographic technology, which uses non-harmful, ultrahigh-frequency radio waves to penetrate clothing to detect and identify concealed objects, as well as obtain accurate body measurements.
Localization of Rayleigh waves B. Garber and M. Cahay
Cahay, Marc
theory to successfully interpret the backscattering spectra of seismic waves recorded in sonic well logs in the interpretation of seismic to two.2 For acoustic seismic waves, a thorough understanding of practically relevant effects
Local Dynamics of Synoptic Waves in the Martian Atmosphere
Kavulich, Michael J., Jr.
2011-10-21T23:59:59.000Z
The sources and sinks of energy for transient waves in the Martian atmosphere are investigated, applying diagnostic techniques developed for the analysis of terrestrial baroclinic waves to output from a Mars General Circulation Model...
Modeling of Wave Impact Using a Pendulum System
Nie, Chunyong
2011-08-08T23:59:59.000Z
For high speed vessels and offshore structures, wave impact, a main source of environmental loads, causes high local stresses and structural failure. However, the prediction of wave impact loads presents numerous challenges due to the complex nature...
Revamped Simulation Tool to Power Up Wave Energy Development...
Revamped Simulation Tool to Power Up Wave Energy Development Revamped Simulation Tool to Power Up Wave Energy Development May 21, 2015 - 2:40pm Addthis Revamped Simulation Tool to...
A Study of SSI Effects Incorporating Seismic Wave Incoherence...
Office of Environmental Management (EM)
A Study of SSI Effects Incorporating Seismic Wave Incoherence within the DOE Complex A Study of SSI Effects Incorporating Seismic Wave Incoherence within the DOE Complex A Study of...
Direct visualization of terahertz electromagnetic waves in classic experimental geometries
Werley, Christopher Alan
2012-01-01T23:59:59.000Z
We used newly developed experimental methods to collect educational video clips of electromagnetic waves propagating at the speed of light. The terahertz frequency waves were generated and detected in LiNbO3 crystals ...
Nonlinear resonance of trapped waves on a plane beach
Li, Guangda, Ph. D. Massachusetts Institute of Technology
2007-01-01T23:59:59.000Z
Linear edge waves were first found mathematically by Stokes (1846). It has long been a topic of interest, since edge waves are believed to be responsible for the formation of beach cusps. Galvin (1965) was the first to ...
Sea surface wave reconstruction from marine radar images
Qi, Yusheng, S.M. Massachusetts Institute of Technology
2012-01-01T23:59:59.000Z
The X-band marine radar is one type of remote sensing technology which is being increasingly used to measure sea surface waves nowadays. In this thesis, how to reconstruct sea surface wave elevation maps from X-band marine ...
Stratospheric gravity wave simulation over Greenland during 24 January 2005
Limpasuvan, Varavut
gravity waves because of imbalance of the jet stream. Where the horizontal jet is rapidly changing speed anticyclonic jet stream over the North Atlantic. Likewise, inertia gravity waves can result from synoptic
Ducted kinetic Alfven waves in plasma with steep density gradients
Houshmandyar, Saeid [Solar Observatory Department, Prairie View A and M University, Prairie View, Texas 77446 (United States); Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315 (United States); Scime, Earl E. [Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315 (United States)
2011-11-15T23:59:59.000Z
Given their high plasma density (n {approx} 10{sup 13} cm{sup -3}), it is theoretically possible to excite Alfven waves in a conventional, moderate length (L {approx} 2 m) helicon plasma source. However, helicon plasmas are decidedly inhomogeneous, having a steep radial density gradient, and typically have a significant background neutral pressure. The inhomogeneity introduces regions of kinetic and inertial Alfven wave propagation. Ion-neutral and electron-neutral collisions alter the Alfven wave dispersion characteristics. Here, we present the measurements of propagating kinetic Alfven waves in helium helicon plasma. The measured wave dispersion is well fit with a kinetic model that includes the effects of ion-neutral damping and that assumes the high density plasma core defines the radial extent of the wave propagation region. The measured wave amplitude versus plasma radius is consistent with the pile up of wave magnetic energy at the boundary between the kinetic and inertial regime regions.
DOE Announces Webinars on the Wave Energy Converter Prize, the...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
DOE Announces Webinars on the Wave Energy Converter Prize, the Best of the Clean Cities Tools and Resources, and More DOE Announces Webinars on the Wave Energy Converter Prize, the...
Modeling of Wave Impact Using a Pendulum System
Nie, Chunyong
2011-08-08T23:59:59.000Z
For high speed vessels and offshore structures, wave impact, a main source of environmental loads, causes high local stresses and structural failure. However, the prediction of wave impact loads presents numerous challenges due to the complex nature...
Theoretical and experimental study of nonlinear internal gravity wave beams
Tabaei Befrouei, Ali, 1974-
2005-01-01T23:59:59.000Z
Continuously stratified fluids, like the atmosphere and the oceans, support internal gravity waves due to the effect of buoyancy. This type of wave motion is anisotropic since gravity provides a preferred direction. As a ...
Energy Department Announces $10 million for Wave Energy Demonstration...
Broader source: Energy.gov (indexed) [DOE]
energy portfolio. The Energy Department-supported demonstrations at the U.S. Navy's wave energy test site off Hawaii's island of Oahu will help develop reliable wave energy...
DOE Announces Webinars on the Wave Energy Converter Prize, the...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
the Wave Energy Converter Prize, the Best of the Clean Cities Tools and Resources, and More DOE Announces Webinars on the Wave Energy Converter Prize, the Best of the Clean Cities...
MODELING WAVE-CURRENT INTERACTION IN THE VICINITY OF
US Army Corps of Engineers
region of the bay are dredged once or twice a year, at significant cost. The interactions between waves of sediment transport and the implications of alternative dredging schemes at Humboldt Bay. The wave model
A characterization of causal automorphisms by wave equations
Do-Hyung Kim
2011-11-07T23:59:59.000Z
A characterization of causal automorphism on Minkowski spacetime is given by use of wave equation. The result shows that causal analysis of spacetime may be replaced by studies of wave equation on manifolds.
Shear-wave splitting and reservoir crack characterization: the...
Shear-wave splitting and reservoir crack characterization: the Coso geothermal field Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Shear-wave...
Orbital stability of periodic waves for the nonlinear Schrodinger equation
Gallay, Thierry
Orbital stability of periodic waves for the nonlinear SchrË?odinger equation Thierry Gallay Institut: Thierry Gallay, Thierry.Gallay@ujfÂgrenoble.fr Keywords: Nonlinear SchrË?odinger equation, periodic waves
Orbital stability of periodic waves for the nonlinear Schrodinger equation
Orbital stability of periodic waves for the nonlinear SchrÂ¨odinger equation Thierry Gallay Institut: Thierry Gallay, Thierry.Gallay@ujf-grenoble.fr Keywords: Nonlinear SchrÂ¨odinger equation, periodic waves
Orbital stability of periodic waves for the nonlinear Schrodinger equation
Boyer, Edmond
Orbital stability of periodic waves for the nonlinear Schr¨odinger equation Thierry Gallay Institut: Thierry Gallay, Thierry.Gallay@ujf-grenoble.fr Keywords: Nonlinear Schr¨odinger equation, periodic waves
Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska
Rokusek, Daniel L
2007-01-01T23:59:59.000Z
(cont.) Investigated in this thesis are the excitation and observation of Langmuir wave turbulence caused by the parametric decay instability (PDI) in high-frequency space plasma heating experiments conducted at the NSF/DoD ...
AdS-plane wave and pp-wave solutions of generic gravity theories
Metin Gurses; Tahsin Cagri Sisman; Bayram Tekin
2014-11-05T23:59:59.000Z
We construct the AdS-plane wave solutions of generic gravity theory built on the arbitrary powers of the Riemann tensor and its derivatives in analogy with the pp-wave solutions. In constructing the wave solutions of the generic theory, we show that the most general two tensor built from the Riemann tensor and its derivatives can be written in terms of the traceless-Ricci tensor. Quadratic gravity theory plays a major role; therefore, we revisit the wave solutions in this theory. As examples to our general formalism, we work out the six-dimensional conformal gravity and its nonconformal deformation as well as the tricritical gravity, the Lanczos-Lovelock theory, and string-generated cubic curvature theory.
Cosmological inference using gravitational wave observations alone
Walter Del Pozzo; Tjonnie G. F. Li; Chris Messenger
2015-06-22T23:59:59.000Z
Gravitational waves emitted during the coalescence of binary neutron star systems are self-calibrating signals. As such they can provide a direct measurement of the luminosity distance to a source without the need for a cosmic distance scale ladder. In general, however, the corresponding redshift measurement needs to be obtained electromagnetically since it is totally degenerate with the total mass of the system. Nevertheless, recent Fisher matrix studies has shown that if information about the equation of state of the neutron stars is available, it is indeed possible to extract redshift information from the gravitational wave signal alone. Therefore, measuring the cosmological parameters in pure gravitational wave fashion is possible. Furthermore, the huge number of sources potentially observable by the Einstein Telescope has led to speculations that the gravitational wave measurement is potentially competitive with traditional methods. The Einstein telescope is a conceptual study for a third generation gravitational wave detector which is designed to yield detections of $10^3-10^7$ binary neutron star systems per year. This study presents the first Bayesian investigation of the accuracy with which the cosmological parameters can be measured using observations of binary neutron star systems by the Einstein Telescope with the one year of observations. We find by direct simulation of $10^3$ detections of binary neutron stars that, within our simplifying assumptions, $H_0,\\Omega_m,\\Omega_\\Lambda,w_0$ and $w_1$ can be measured at the $95\\%$ level with an accuracy of $\\sim 8\\%,65\\%,39\\%,80\\%$ and $90\\%$, respectively. We also find, by extrapolation, that a measurement accuracy comparable with current measurements by Planck is reached for a number of observed events $O(10^{6-7})$
Environmental Effects for Gravitational-wave Astrophysics
Enrico Barausse; Vitor Cardoso; Paolo Pani
2015-01-07T23:59:59.000Z
The upcoming detection of gravitational waves by terrestrial interferometers will usher in the era of gravitational-wave astronomy. This will be particularly true when space-based detectors will come of age and measure the mass and spin of massive black holes with exquisite precision and up to very high redshifts, thus allowing for better understanding of the symbiotic evolution of black holes with galaxies, and for high-precision tests of General Relativity in strong-field, highly dynamical regimes. Such ambitious goals require that astrophysical environmental pollution of gravitational-wave signals be constrained to negligible levels, so that neither detection nor estimation of the source parameters are significantly affected. Here, we consider the main sources for space-based detectors -- the inspiral, merger and ringdown of massive black-hole binaries and extreme mass-ratio inspirals -- and account for various effects on their gravitational waveforms, including electromagnetic fields, cosmological evolution, accretion disks, dark matter, "firewalls" and possible deviations from General Relativity. We discover that the black-hole quasinormal modes are sharply different in the presence of matter, but the ringdown signal observed by interferometers is typically unaffected. The effect of accretion disks and dark matter depends critically on their geometry and density profile, but is negligible for most sources, except for few special extreme mass-ratio inspirals. Electromagnetic fields and cosmological effects are always negligible. We finally explore the implications of our findings for proposed tests of General Relativity with gravitational waves, and conclude that environmental effects will not prevent the development of precision gravitational-wave astronomy.
Ramos Heredia, Rafael Juda
1995-01-01T23:59:59.000Z
the first time I met him. I would also like to convey my appreciation to my sponsor, Instituto Mexicano del Petroleo, and to the Offshore Technology Research Center for providing the experimental data contained in this work. Special thanks go to Dr. John M... of the Department) May 1995 Major Subject: Ocean Engineering Comparisons on Offshore Structure Responses to Random Waves Using Linear and High-order Wave Theories. (May 1995) Refuel Juda Ramos Heredia, B. S. , Instituto Politecnico Nacional, Mexico City Chair...
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.
Compressible Turbulence and Interactions with Shock Waves and...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
problems in various disciplines, including supernova explosions, inertial confinement fusion, hypersonic flight and propulsion, and shock wave lithotripsy....
Three-Dimensional Simulations of Deep-Water Breaking Waves
Brucker, Kyle A; Dommermuth, Douglas G; Adams, Paul
2014-01-01T23:59:59.000Z
The formulation of a canonical deep-water breaking wave problem is introduced, and the results of a set of three-dimensional numerical simulations for deep-water breaking waves are presented. In this paper fully nonlinear progressive waves are generated by applying a normal stress to the free surface. Precise control of the forcing allows for a systematic study of four types of deep-water breaking waves, characterized herein as weak plunging, plunging, strong plunging, and very strong plunging.
Scour around a circular pile due to oscillatory wave motion
Wells, Donald Raymond
1970-01-01T23:59:59.000Z
( COLEMAN ) 10 authors. In general the committee on sedimentation has found many inconsistencies in critical velocities necessary for incipient motion and have concluded that when studying incipient motion critical shear stresses should be the governing...- city of the paddle arm on the flywheel. The period is varied through a variable rheostat that controls the speed of the flywheel. The rocker arms can be varied so as to vary the wave from a deep water wave to a shallow water wave. Wave heights...
Self-similar solitary wave family in Bessel lattice
Cai Zebin [Department of Physics, Huazhong University of Science and Technology, Wuhan (430074) (China); Department of Basis, Air Force Radar Academy, Wuhan (430019) (China); Liang Jianchu [Department of Electric Science, College of Huizhou, Guangdong (510006) (China); Xia Xiongping; Jin Haiqin; Yi Lin [Department of Physics, Huazhong University of Science and Technology, Wuhan (430074) (China); Jiang Yue [Department of Basis, Air Force Radar Academy, Wuhan (430019) (China)
2011-05-15T23:59:59.000Z
We focus on the formation and propagation of self-similar solitary wave family in Kerr nonlinear media with external Bessel lattice. A novel analytical solitary wave solution to (3+1)-dimensional Gross-Pitaevskii equation with varying coefficients and an external potential is obtained. The components of solitary wave family are differentiated by three quantum parameters. The properties and the stability of the solitary wave family are discussed in detail.
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...
Electromagnetic guided waves on linear arrays of spheres
Electromagnetic guided waves on linear arrays of spheres C M Linton, V Zalipaev, and I Thompson electromagnetic waves propagating along one-dimensional arrays of dielec- tric spheres are studied. The quasi. There have been previous studies of electromagnetic surface waves guided by periodic arrays, but these have