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На этой странице приведены все страницы сервера ,которые мы индексируем. Показаны документы 1221 - 1240 из 2727011.

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1221. Abstract
... Nondestructive Stress State Evaluation Using Acoustoelasticity Phenomenon . N.Nikitina (Nizhny Novgorod Branch of Blagonravov Mechanical Engineering Research Institute of Russian Academy of Sciences, Nizhny Novgorod, Russia) . ... Taking into account nonlinear terms in the wave equation, one may find the dependence between the velocity of elastic waves and the values of mechanical stresses. ... So, the evaluation of the mechanical stresses by the ultrasonic method is provided. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NondestructiveStressStateEvaluationUsingAcoustoelasticityPhenomenon.htm -- 7.1 Кб -- 10.07.2002
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1222. Abstract
... Nonlinear Acoustic Borehole Equipment . ... Characteristics are of various generator devices and acoustic transducers are presented with capability of non-linear action on an area located nearby a hole bottom. Possible mechanisms of action on fluid-saturated hard rocks are described as well as analytical estimations of acoustic pressure at difference frequencies carried out by method of wave fronts for various hard rocks. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticBoreholeEquipment.htm -- 6.2 Кб -- 10.07.2002
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1223. Abstract
... Nonlinear Acoustic Detection of Cracks . ... It causes different nonlinear acoustic responses such as higher harmonics generation or nonlinear modulation of an ultrasound wave passing through or reflected from a crack by low frequency vibrations of a testing object. These effects are used for the development of methods of nonlinear acoustic nondestructive evaluation. ... Advanced methods allow one to measure crack position. In this paper methods of crack detection and location are considered. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticDetectionofCracks.htm -- 6.7 Кб -- 10.07.2002
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1224. Abstract
... Nonlinear Acoustic Diagnostics of Defects and Damages of Buildings and Engineering Constructions . ... A large experience was accumulated during last decade in the application of nonlinear methods of acoustic diagnostics of bridges, tunnels, thermal power stations, new high-rise buildings and historically valuable architectural objects. ... This contact problem plays the principal role for the new building up when the new house is surrounded by tumbledown houses, and the subway is laid under it. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticDiagnosticsofDefectsandDamagesofBuildingsandEngineeringConstructions.htm -- 7.0 Кб -- 10.07.2002
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1225. Abstract (Invited)
... Nonlinear Acoustic Phenomena in Atmosphere . ... Samples of evidence for nonlinear atmospheric effects in long-range infrasound propagation from explosions of different types and yields are presented. ... The fact that the "acoustic pulse" I - the product of the wave profile area S in the coordinates p (pressure) and t (time) by the distance to the source r - is conserved during long-range infrasound propagation in the atmosphere is experimentally supported. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticPhenomenainAtmosphere.htm -- 7.8 Кб -- 10.07.2002
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1226. Abstract
... Nonlinear Acoustic Properties of Layered Crystals . ... Study of the elastic nonlinearity by direct measuring of the ultrasound high harmonics generation has been carried out. ... It has been shown, that high anisotropy of mechanical strength of layered crystals arises from high anisotropy of bonding forces anharmonicity. It results in the extremely large value of the nonlinear elastic coefficient across the layers and the anharmonicity constant of the appropriate longitudinal phonon modes. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticPropertiesofLayeredCrystals.htm -- 6.5 Кб -- 10.07.2002
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1227. Abstract
... Airborne sound at two primary frequencies f1 and f2 undergo acoustic-to-seismic coupling and a superimposed seismic wave interacts with the compliant mine and soil to generate a difference frequency component that can effect the vibration velocity at the surface. Geophone measurements scanning the soil's surface at the difference frequency (chosen at a resonance) profile the mine with more relative sensitivity than the linear profiles - but off the mine some nonlinearity exists. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticTechniquesforLandmineDetection.htm -- 7.1 Кб -- 10.07.2002
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1228. Abstract
... Nonlinear Acoustic Waves Description by Exact Solutions of Modulation Equations . ... Exact solutions of some nonlinear modulation equations (Nonlinear Schrodinger equation, Coupled Schrodinger equations, Ginzburg-Landau equation) are obtained in an explicit form. ... The modulation equations govern finite-amplitude acoustic waves evolution in various wave-guides, in particular, in layered media. The profiles of their exact solutions are very similar to that observed recently in experiments [1,2]. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticWavesDescriptionbyExactSolutionsofModulationEquations.htm -- 6.6 Кб -- 10.07.2002
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1229. Abstract
... Nonlinear Acoustic Waves in Micropolar and Granular Media . ... Oscillations of the chain of dumb-bell-shaped particles [Potapov A.I., Pavlov I.S., Maugin G.A. Nonlinear wave interactions in 1D crystals with complex lattice. Wave Motion. ... P. 297-312] and particles of rectangular shape [Lisina S.A., Potapov A.I., Nesterenko V.F. Nonlinear granular medium with rotations of the particles. ... The last property enables one to obtain additional data about the medium microstructure. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearAcousticWavesinMicropolarandGranularMedia.htm -- 7.4 Кб -- 10.07.2002
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1230. Abstract
... Nonlinear Behavior of an Annular Liquid Sheet . T.Yoshinaga, K.Kotani (Department of Mechanical Science, Osaka University, Osaka, Japan) . ... Behavior of a gas-cored annular liquid sheet is analytically studied when the effect of finite thickness of the sheet is considered. Nonlinear evolution equations for an axisymmetric ring element of the sheet are derived by means of the membrane approximation under the influence of its own inertia, surface tension and gaseous hydrostatic pressure. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearBehaviorofanAnnularLiquidSheet.htm -- 6.7 Кб -- 10.07.2002
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1231. Abstract
... Nonlinear Dependence of Velocity of Elastic Waves on Uniaxial Tension in Single-Crystal Terbium . ... The results of experimental investigation of dependencies of a longitudinal sound velocity on uniaxial tension in a terbium single crystal are presented. Tension was applied along the hexagonal axis and changed in an interval 0-60 MPa. ... Under the pressure ~30 MPa nonlinear dependence of sound velocity on the static pressure was observed. The results can be treated as the following. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearDependenceofVelocityofElasticWavesonUniaxialTensioninSingleCrystalTerbium.htm -- 6.7 Кб -- 10.07.2002
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1232. Abstract
... Nonlinear Dynamics of Grains in a Liquid-Saturated Soil . ... Such nonlinear behaviour is well-defined at significant local deformation caused by high applied load, even if the load does not vary in time. However, there exist a different type of nonlinearity which manifests itself due to inertial forces between grains. ... The inertial attractive forces have hydrodynamic origin, and the repulsive forces are caused by deformation of colliding grains. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearDynamicsofGrainsinaLiquidSaturatedSoil.htm -- 7.0 Кб -- 10.07.2002
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1233. Abstract (Invited)
... Nonlinear Effects Associated with Generation and Propagation of Phase Conjugate Ultrasound Beams . ... Nonlinear acoustical effects in phase conjugate (PC) ultrasound beams have recently become a promising topic for study and applications. ... Nonlinear propagation effects in finite-amplitude PC beams in water are considered experimentally and numerically. ... Conjugation of the second harmonic in a focused nonlinear incident beam was also studied. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearEffectsAssociatedwithGenerationandPropagationofPhaseConjugateUltrasoundBeams.htm -- 7.3 Кб -- 10.07.2002
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1234. Abstract (Invited)
... Nonlinear Effects in Ultrasonic Transmission in Atomic Force Microscope Contacts . ... In Atomic Force Microscopy (AFM), the forces between a sharp tip and a surface of a sample determine the contrast observed in imaging. ... The eigenfrequencies of these modes depend on the forces acting between the tip and the sample surface. In case of a contacting tip a situation can be achieved where the Hertzian contact stiffness is prevailing. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearEffectsinUltrasonicTransmissioninAtomicForceMicroscopeContacts.htm -- 7.5 Кб -- 10.07.2002
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1235. Abstract
... Nonlinear Effects of Plane Longitudinal Wave Propagation in Porous Materials . ... Several nonlinear effects of plane longitudinal wave propagation in dry porous medium are studied. ... The dependence of basic parameters (velocity, amplitude) of super-harmonic waves on parameters of porous medium (porosity, pore size) is established. ... Relations between the parameters of the wave (velocity, amplitude, frequency) and the parameters of the material have been established. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearEffectsofPlaneLongitudinalWavePropagationinPorousMaterials.htm -- 7.1 Кб -- 10.07.2002
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1236. Abstract
... Nonlinear Elastic Rayleigh Wave Scattered by Local Surface Inhomogeneity . ... The solution of the problem of elastic Rayleigh wave scattering by local surface inhomogeneity is presented. The inhomogeneity is simulated by a thin disk that slightly rises above the plane surface. There is slow acoustical nonlinearity in the material of the disk consisting in small different bulk and shear elastic moduli in the first and third quadrants which gives a break of the stress-strain caracteristic. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearElasticRayleighWaveScatteredbyLocalSurfaceInhomogeneity.htm -- 6.8 Кб -- 10.07.2002
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1237. Abstract
... Nonlinear FDTD-Modeling of Ultrasound Thermotherapy Including Temperature Dependent Tissue Parameters . ... It strongly depends on the counteracting processes of nonlinear ultrasound propagation and tissue attenuation. ... The temperature dependence of tissue parameters is taken into account for the complete model. ... Furthermore it is demonstrated that the temperature dependence of tissue parameters can not be neglected for accurate predictions of the required heating time. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearFDTDModelingofUltrasoundThermotherapyIncludingTemperatureDependentTissueParameters.htm -- 7.0 Кб -- 10.07.2002
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1238. Abstract
... Nonlinear Gas Oscillation and Streaming Motion in a Closed Tube with Varying Cross Section . ... The nonlinear resonant gas oscillation and acoustic streaming motion in a closed tube with varying cross section filled with an ideal gas are numerically studied. The resonant gas oscillation is excited by a piston at one end of the tube, which oscillates harmonically at the fundamental resonant frequency of linear quasi-one-dimensional wave motion. ... Section : 7 ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearGasOscillationandStreamingMotioninaClosedTubewithVaryingCrossSection.htm -- 6.8 Кб -- 10.07.2002
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1239. Abstract
... Nonlinear Generation and Propagation of Lamb Waves . ... Some interesting features of the physics of the second harmonics of Lamb waves are given. ... The formation process of the second harmonics with cumulative growth effects and the corresponding solutions are presented. It is found that the phases of partial waves of the second harmonics are proportional to the propagation distance for the case in which the phase velocities of fundamental and duple frequency Lamb modes are approximately equal. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearGenerationandPropagationofLambWaves.htm -- 6.9 Кб -- 10.07.2002
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1240. Abstract (Invited)
... Nonlinear Imaging Techniques in Diagnostic Ultrasound . M.A.Averkiou (Philips Ultrasound/ATL, Bothell, WA, USA) . ... There are two main areas of nonlinear imaging: ultrasound contrast microbubble (contrast agents) imaging and tissue harmonic imaging. ... In contrast imaging there are two approaches: high amplitude (mechanical index.MI) that causes quick bubble destruction and very broadband signals, and low amplitude (MI) for stable harmonic oscillations without destruction. ...
[ Сохраненная копия ]  Ссылки http://acs366.phys.msu.su/isna16/Abstracts/NonlinearImagingTechniquesinDiagnosticUltrasound.htm -- 6.9 Кб -- 10.07.2002
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