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we present a trajectory-based solution to the elastodynamic equation of motion that is valid across a wide range of seismic frequencies. that is, the derivation of the solution does not invoke a high-frequency assumption or require that the medium have smoothly varying properties. the approach, adopted from techniques ... | broad-band trajectory mechanics |
wave propagation signals are commonly used as information carrier in structural health monitoring. to facilitate decision making, wave signals are often decomposed into multiple components to reveal its frequency or time-frequency content. in this research we investigate the use of time-frequency decomposition techniqu... | on time-frequency domain feature extraction of wave signals for structural health monitoring |
the paper presents a synthesis of past and recently acquired laboratory test results on granular soils using wave propagation techniques at very small strain amplitudes. resonant column tests on uniform to well-graded coarse sands and gravels of angular and low sphericity grains were analyzed. empirical-type equations ... | dynamics of potential fill-backfill material at very small strains |
modern techniques for specifying the ionosphere include the use of ionosondes, which both transmit and receive sweep soundings in the high-frequency (hf) band. we replicate this process by observing the broad band emission from lightning using the long wavelength array, sevilleta, radio telescope. we use this station t... | using lightning as a hf signal source to produce ionograms |
the subduction and roll-back of the african plate beneath the eurasian plate along the arcuate hellenic trench is the dominant geodynamic process in the aegean and western anatolia. mantle flow and lithospheric kinematics in this region can potentially be understood better by mapping seismic anisotropy. this study uses... | investigation of mantle kinematics beneath the hellenic-subduction zone with teleseismic direct shear waves |
in this work results of numerical simulations and experimental measurements related to the high frequency dynamics of an aluminium timoshenko periodic beam are presented. it was assumed by the authors that the source of beam structural periodicity comes from periodical alterations to its geometry due to the presence of... | high frequency dynamics of an isotropic timoshenko periodic beam by the use of the time-domain spectral finite element method |
magnetoacoustic tomography with magnetic induction (mat-mi) is a noninvasive imaging method developed to map electrical conductivity of biological tissue with millimeter level spatial resolution. in mat-mi, a time-varying magnetic stimulation is applied to induce eddy current inside the conductive tissue sample. in the... | magnetoacoustic tomography with magnetic induction (mat-mi) for imaging electrical conductivity of biological tissue: a tutorial review |
we perform a theoretical investigation of light propagation and anderson localization in one-dimensional disordered superlattices composed of dielectric stacks with graphene sheets in between. disorder is introduced either on graphene material parameters (e.g., fermi energy) or on the widths of the dielectric stacks. w... | anderson localization of light in disordered superlattices containing graphene layers |
in seismic data processing, surface waves and body waves are usually processed differently. we propose a data-driven approach to predict and separate the dispersive surface waves in multichannel seismic data. we first estimate high-resolution surface-wave phase velocities from the recorded data based on the multi-chann... | data-driven dispersive surface-wave prediction and mode separation using high-resolution dispersion estimation |
in a phase-field approach to fracture crack propagation is modeled by means of an additional continuous field. in this paper, two problems of linear elastic fracture mechanics are studied experimentally and numerically in order to evaluate the practicability of the phase-field approach and to validate the measured para... | the phase-field approach as a tool for experimental validations in fracture mechanics |
sound wave propagation in a shallow water environment is complex due to e.g. the uncertainties of sound speed profile being inhomogeneous and imprecisely measured, the bottom reflections, etc. the propagation and influence of several uncertainty parameters are quantified in this paper. a four-layer model, which can app... | uncertainty quantification for acoustic wave propagation in a shallow water environment |
the numerical assessment of the dynamic response of buildings exposed to railway traffic usually requires advanced numerical models that take into account the three-dimensional character of the problem. however, engineering practice requires simple and efficient methodologies. thus, in order to reduce the uncertainties... | hybrid soil-structure interaction approach for the assessment of vibrations in buildings due to railway traffic |
acoustic emission (ae) is a transient phenomenon in which an elastic wave propagates to a structure as a result of structure damage such as micro-cracks, internal-cracks, friction, fiber breakage and fiber matrix debonding in a structure. ae encompasses a lot of information related to the integrity of the structure. pa... | laser-based structural training algorithm for ae localization and damage accumulation visualization in a composite wing skin with various sub-structures |
the present contribution investigates the influence of line source on the propagation of horizontally polarized shear waves (sh-waves) in a complex stratified structure which comprises two distinct nonlocal anisotropic fluid-saturated poro-viscoelastic layers resting over a nonlocal functionally graded anisotropic flui... | analytical approach to determine the impact of line source on sh-wave propagation in an anisotropic poro-viscoelastic layered structure in the context of eringen's nonlocal elasticity theory |
epsilon-near-zero (enz) metamaterials present exciting features such as an almost infinite effective wavelength and phase velocity. however, a major challenge when using such artificial media is to achieve impedance matching due to their vanishing permittivity. to address this, it has recently been shown that wave prop... | unidirectional transparency in epsilon-near-zero based rectangular waveguides induced by parity-time symmetry |
the shallow water wave model is one of the completely integrable models illustrating many physical problems. in this article, we investigate new exact wave structures to kadomtsev-petviashvili-benjamin-bona-mahony and the benney-luke equations which explain the behavior of waves in shallow water. the exact structures a... | diverse wave propagation in shallow water waves with the kadomtsev-petviashvili-benjamin-bona-mahony and benney-luke integrable models |
we report the analysis of elastic properties of a composite medium consisting of gan nanowires embedded into a dielectric matrix, which constitutes the active material of nanowire-based piezogenerators. a non-invasive technique, transient grating method, is used to generate and analyze the propagation of acoustic waves... | probing elastic properties of nanowire-based structures |
we examine an extended (2+1)-dimensional perturbed nonlinear schrödinger equation with kerr law nonlinearity in a nano-optical fiber with fourth-order spatial derivatives in this paper. we develop various optical solutions to the equation under study using the jacobi elliptic expansion method. we investigate the conseq... | modulation instability analysis and optical solutions of an extended (2+1)-dimensional perturbed nonlinear schrödinger equation |
a well-known shortcoming of single-spacecraft spectral analysis is that only the 1d wavenumber spectrum can be observed, assuming the characteristic wave propagation speed is much smaller than the solar wind flow speed. this limitation has motivated an extended debate about whether fluctuations observed in the solar wi... | observations of waves and structures by frequency-wavenumber spectrum in solar wind turbulence |
shear wave elastography is a non-invasive measurement technique to infer mechanical properties of soft tissue. a shear wave is propagated inside a region of interest. the medium perturbations caused by the wave are measured using an imaging modality, e.g., ultrasound, or nmr. the shear wave speed in the medium is thus ... | shear wave speed in pressurized soft tissue |
turbulence-induced wavefront deformations cause the irradiance of an optical signal to fluctuate resulting a in serious degradation in the bit-error-rate (ber) performance of optical wireless communication (owc) system. adaptive optics is an effective technique to compensate for the wavefront aberrations to reduce the ... | adaptive optics effect on performance of bpsk-sim oceanic optical wireless communication systems with aperture averaging in weak turbulence |
we present a systematic study of seismic attenuation and its related q structure derived from the spectral analysis of p-, s-waves in the southern india. the study region is separated into parts of edc (eastern dharwar craton), western dharwar craton (wdc) and southern granulite terrain (sgt). the study is carried out ... | attenuation characteristics of high frequency seismic waves in southern india |
this talk will present an overview of the research conducted on ultrasonic time-reversal methods applied to biomedical imaging and to non-destructive testing. we will first describe iterative time-reversal techniques that allow both focusing ultrasonic waves on reflectors in tissues (kidney stones, micro-calcifications... | acoustic imaging with time reversal methods: from medicine to ndt |
distributed temperature sensing is the preferred approach for detecting and localizing normal zones in the high-field magnets of particle accelerators and fusion energy systems based on high-temperature superconductors. optical fibers show promise in realizing this approach but suffer from known drawbacks, such as fibe... | distributed thermometry for superconducting magnets using non-leaky acoustic waveguides |
guided wave (gw) structural health monitoring (shm) allows to assess the health of aerostructures thanks to the great sensitivity to delamination and/or debondings appearance. due to the several complexities affecting wave propagation in composites, an efficient gw shm system requires its effective quantification assoc... | model assisted probability of detection for a guided waves based shm technique |
this work presents a new methodology designed to estimate the slowness vector in large-aperture sparse ocean bottom seismometer (obs) arrays. the continuous wavelet transform (cwt) is used to convert the original incoherent traces that span a large array, into coherent impulse functions adapted to the array aperture. s... | slowness vector estimation over large-aperture sparse arrays with the continuous wavelet transform (cwt): application to ocean bottom seismometers |
this paper presents a structural health monitoring (shm) methodology for detecting damage in a composite bonded repair. the application of guided wave based techniques in a step-sanded bonded repair under operational and environmental load is thoroughly investigated. a two step damage detection and localization algorit... | damage detection & localization on composite patch repair under different environmental effects |
in the context of a systematic study of oxide materials with the muon spin spectroscopy (μ sr ) technique, we report here on an investigation of paramagnetic nd2o3 . the question was whether the magnetism of nd3 + has an influence on the observed signals. in nd2o3 , as in the other oxides, a weakly paramagnetic compone... | paramagnetic rare-earth oxide nd 2o 3 investigated by muon spin spectroscopy |
this paper aims to improve the robustness of interpretation in the s receiver function (srf), a technique commonly used to retrieve forward scattering of s-to-p converted waves (sdp) originated from the lithosphere-asthenosphere system (las) beneath the stations. although the srf does not suffer interferences from back... | data-oriented constraint on the interpretation of s receiver function and its application to observations of seismic discontinuities in the lithosphere-asthenosphere system |
this paper proposes a new efficient stochastically adapted spectral finite element method to simulate fault dislocation and its wave propagation consequences. for this purpose, a dynamic form of the split node technique is formulated and developed to stochastic spectral finite element method in order to model fault dis... | a stochastic spectral finite element method for solution of faulting-induced wave propagation in materially random continua without explicitly modeled discontinuities |
in this work, the formation and properties of ga2s3 thin films deposited onto polycrystalline ge substrates are studied by means of scanning electron microscopy, energy dispersive x-ray analyzer, raman spectroscopy, x-ray diffraction techniques, ultraviolet-visible light spectrophotometry in the range of 300-1100 nm an... | design and characterization of the ge/ga2s3 heterojunction |
the objective of this study was to noninvasively image fragipan layers using a high-frequency multi-channel analysis of surface wave (hf-masw) method. the hf-masw method is developed to measure the soil profile in terms of the shear wave velocity at depths up to a few meters in the vadose zone. the present masw method ... | imaging a soil fragipan using a high-frequency multi-channel analysis of surface wave method |
folding is a process in which bending is localized at sharp edges separated by almost undeformed elements. this process is rarely encountered in nature, although some exceptions can be found in unusual layered rock formations (called `chevrons') and seashell patterns (for instance lopha cristagalli). in mechanics, the ... | folding and faulting of an elastic continuum |
concrete is the most ubiquitous construction material. apart from the fresh and early age properties of concrete material, its condition during the structure life span affects the overall structural performance. therefore, development of techniques such as non-destructive testing which enable the investigation of the m... | development of a tomography technique for assessment of the material condition of concrete using optimized elastic wave parameters |
this article presents a brief historical review of g. i. taylor's solution of the point blast wave problem which was applied to the trinity test of the first atomic bomb. lie group symmetry techniques are used to derive taylor's famous two-fifths law that relates the position of a blast wave to the time after the explo... | on the symmetry of blast waves |
we present a technique for determining the rheology of visco-elastic materials in the ultrasonic frequency range based on the measurement of the longitudinal and shear waves reflected and transmitted by a slab of material with a controlled thickness sandwiched between two delay lines. the high sensitivity of this fabry... | ultrasonic rheology of visco-elastic materials using shear and longitudinal waves |
the bone fracture healing mechanism of the low-intensity pulsed ultrasound technique is not yet clearly understood. in our previous study, the electrical potentials induced in bone were successfully measured by focusing on piezoelectricity in the mhz range. bone is composed of collagen and hydroxyapatite and has strong... | effect of anisotropy on stress-induced electrical potentials in bovine bone using ultrasound irradiation |
the stiffness of the arteries is known to be an indicator of the progression of various cardiovascular diseases. clinically, the pulse wave velocity (pwv) is used as a surrogate for arterial stiffness. pulse wave imaging (pwi) is a non-invasive, ultrasound-based imaging technique capable of mapping the motion of the ve... | cross-correlation analysis of pulse wave propagation in arteries: in vitro validation and in vivo feasibility |
we form the analytical solitary wave solutions with the execution of generalized direct algebraic technique on three well-known nonlinear wave models, namely, called foam drainage, longitudinal magnetoelectro-elastic circular rod and modified degasperis-procesi equations. the derived solutions are hyperbolic functions ... | analytical methods: nonlinear longitudinal wave equation in a magnetoelectro-elastic circular rod, foam drainage and modified degasperis-procesi models arising in nonlinear water wave models |
the curvilinear-grid finite-difference method (fdm), which uses curvilinear coordinates to discretize the nonplanar interface geometry, is extended to simulate acoustic and seismic-wave propagation across the fluid–solid interface at the sea bottom. the coupled acoustic velocity-pressure and elastic velocity-stress for... | 3d seismic-wave modeling with a topographic fluid–solid interface at the sea bottom by the curvilinear-grid finite-difference method |
the features of spin-wave propagation in a magnonic superlattice are investigated theoretically and experimentally. this superlattice consists of periodic metallic gratings, having two non-equal periods located at the surface of the ferromagnetic film. it is shown that two band gaps are formed in the spin-waves spectru... | band structure formation in magnonic bragg gratings superlattice |
this paper proposed a novel plate-harvester system with local oscillators for energy harvesting of flexural wave propagation. the local oscillator inside a hole was constructed by a piezoelectric composite beam of which two ends were respectively anchored to the host plate and the inner plate. the semi-analytical model... | a semi-analytical model for energy harvesting of flexural wave propagation on thin plates by piezoelectric composite beam resonators |
we estimate vertical rotation rates for 204 earthquakes that were induced by the 2018 stimulation of the espoo/helsinki geothermal reservoir from wavefield gradients across geophone arrays. the array derived rotation rates from seismograms recorded at 6-9 km hypocentral distances vary between 10−9 and 10−7 rad s−1, ind... | using array derived rotational motion to obtain local wave propagation properties from earthquakes induced by the 2018 geothermal stimulation in finland |
pulse wave velocity (pwv) is a surrogate marker of arterial stiffness linked to cardiovascular morbidity. pulse wave imaging (pwi) is a technique developed by our group for imaging the pulse wave propagation in vivo. pwi requires high temporal and spatial resolution, which conventional ultrasonic imaging is unable to s... | pulse wave imaging using coherent compounding in a phantom and in vivo |
backgroundlow‑intensity transcranial focused ultrasound (tfus) has gained considerable attention as a promising noninvasive neuromodulatory technique for human brains. however, the complex morphology of the skull hinders scholars from precisely predicting the acoustic energy transmitted and the region of the brain impa... | numerical and experimental evaluation of low‑intensity transcranial focused ultrasound wave propagation using human skulls for brain neuromodulation |
magnetic resonance elastography (mre) is a method for measuring the mechanical properties of soft tissue in vivo, non-invasively, by imaging propagating shear waves in the tissue. the speed and attenuation of waves depends on the elastic and dissipative properties of the underlying material. tissue mechanical propertie... | pre-clinical mr elastography: principles, techniques, and applications |
cross correlation of ambient seismic noise has begun to provide detailed images of the earth that are not possible to attain using earthquake-based or active-source imaging techniques. however, the theoretical justification for the ambient noise correlation or seismic interferometry approach typically relies on an equi... | the relationship between cross correlations and green's functions in ambient noise interferometry with bayesian constraints |
objective. atherosclerosis is a vascular disease characterized by compositional and mechanical changes in the arterial walls that lead to a plaque buildup. depending on its geometry and composition, a plaque can ruptured and cause stroke, ischemia or infarction. pulse wave imaging (pwi) is an ultrasound-based technique... | feasibility of longitudinal monitoring of atherosclerosis with pulse wave imaging in a swine model |
both the aerospace and marine industry have widely relied on a honeycomb sandwich structure (hss) because of its high strength-to-weight ratio. however, the intrinsic nature of an adhesively bonded multi-layer structure increases the risk of debonding when the structure is under strain or exposed to varying temperature... | wave propagation in aluminum honeycomb plate and debonding detection using scanning laser vibrometer |
numerical modelling of wave propagation in the heterogeneous and anisotropic porous media is important for seismic exploration. when modelling time-domain poroelastic waves in an unbounded region, the implementation of perfectly matched layer (pml) is a common technique to absorb the outgoing waves. the pml in terms of... | nearly perfectly matched layer implementation for time domain spectral element modelling of wave propagation in 3d heterogeneous and anisotropic porous media |
periodic metafoundations have proven to inherit valuable properties from wave propagating in phononic periodic structures in the very low-frequency regime. therefore, finite locally resonant metafoundations (lrms) represent a novel type of seismic isolation for ultralow-frequency applications. in this context, it is st... | stochastic analysis of locally resonant linear and hysteretic metamaterials for seismic isolation of process equipment |
laser texturing with a nanosecond pulsed nd3+:yag laser in air and water is used to create surface textures in a-si thin films based on the laser beam overlap technique that enhances light-trapping along with simultaneous crystallization and defects passivation. the light-trapping characteristics of textures are analyz... | numerical and experimental analysis of nano second laser induced surface textures for light trapping in a-si thin film for solar cells |
this paper describes the commissioning of the flexible asymmetric shock tube (fast), a novel ludwieg tube-type facility designed and built at delft university of technology, together with the results of preliminary experiments. the fast is conceived to measure the velocity of waves propagating in dense vapours of organ... | the flexible asymmetric shock tube (fast): a ludwieg tube facility for wave propagation measurements in high-temperature vapours of organic fluids |
we show how to solve time-harmonic wave scattering problems on unbounded domains without truncation. the technique, first developed in numerical relativity for time-domain wave equations, maps the unbounded domain to a bounded domain and scales out the known oscillatory decay towards infinity. we design a null infinity... | a null infinity layer for wave scattering |
in this paper, a random forest regression (rfr) rain size characterization method based on a laser ultrasound technique is investigated to predict the grain size of titanium alloy (ti-6al-4v). the longitudinal wave velocity of the ultrasound signal and the attenuation coefficient at different frequencies are used as th... | grain size characterization of ti-6al-4v titanium alloy based on laser ultrasonic random forest regression |
the real-time information of the unknown ionospheric environments is difficult to obtain, plaguing the timely and accurate geolocation of high frequency (hf) sources. in this paper, we propose an improved hf skywave source geolocation method based on the time-difference-of-arrival (tdoa) with the semidefinite programmi... | an improved tdoa method for land-based long-range hf skywave source geolocation and experimental results |
bulk la1-xcaxmno3 (x=0.70, 0.75 and 0.90) perovskite samples were synthesized using solid state reaction technique. x-ray diffraction study on the sample indicates that the sample has single phase orthorhombic structure with a space group of pnma and has no secondary phase. by employing through transmission technique o... | study of high temperature metal-insulator phase transition in la1-xcaxmno3 employing in-situ ultrasonic studies |
to date, both micro-seismic (ms) and electromagnetic radiation (emr) techniques are used as normal, daily safety monitoring tools for coal or rock dynamic disasters in china. in previous studies, these two non-destructive techniques are usually analyzed independently; few works have been done to characterize the correl... | the correlated characteristics of micro-seismic and electromagnetic radiation signals on a deep blasting workface |
the interaction of electromagnetic waves with metallic nanostructures generates resonant oscillations of the conduction-band electrons at the metal surface. these resonances can lead to large enhancements of the incident field and to the confinement of light to small regions, typically several orders of magnitude small... | computing parametrized solutions for plasmonic nanogap structures |
we propose a self-adaptive absorbing technique for quasilinear ultrasound waves in two- and three-dimensional computational domains. as a model for the nonlinear ultrasound propagation in thermoviscous fluids, we employ westervelt's wave equation solved for the acoustic velocity potential. the angle of incidence of the... | self-adaptive absorbing boundary conditions for quasilinear acoustic wave propagation |
this paper develops an averaging technique based on the combination of the eigenfunction expansion method and the collaboration method to investigate the multiple scattering effect of the sh wave propagation in a porous medium. the semi-analytical averaging technique is conducted using monto carlo method to understand ... | a homogenized damping model for the propagation of elastic wave in a porous solid |
the mutual interaction between a number of multi degrees of freedom mechanical systems moving with uniform speed along an infinite taut string supported by a viscoelastic layer has been studied using the substructure synthesis method when base excitations of a common frequency are given to the mechanical systems. the m... | coupled dynamics of a viscoelastically supported infinite string and a number of discrete mechanical systems moving with uniform speed |
shock waves are common in polymer-based particulate composites that are subjected to intermediate to high-velocity impact loading. however, quantitative information on the spatial variation of stress, particle velocities, and energy dissipation during the formation and propagation of weak-shock waves is limited. in thi... | weak-shock wave propagation in polymer-based particulate composites |
frequency domain decomposition (fdd) is a well-established spectral technique used in civil engineering to analyse and monitor the modal response of buildings and structures. the method is based on singular value decomposition of the cross-power spectral density matrix from simultaneous array recordings of ambient vibr... | modal analysis of 2-d sedimentary basin from frequency domain decomposition of ambient vibration array recordings |
results of a theoretical and experimental investigation of the spatiotemporal extent of optically generated elastic waves in thin, free-standing, semiconductor films are presented. our study, focused on symmetric s1 modes in the 10 + ghz frequency range, indicates that diffraction-limited pulsed laser sources can produ... | photoexcited elastic waves in free-standing gaas films |
we have investigated the spin-wave dynamics in a one-dimensional magnonic crystal (mc) with respect to the heat radiation due to the damping of the spin waves. the spin waves were excited by applying microwaves via a wire antenna. the heat induced by the excitation and propagation of spin waves was measured using the l... | lock-in thermographic study of spin-wave propagation in magnonic crystals |
electromagnetic wavefront portions grazing or nearly grazing the surface of a macroscopic particle contribute to the extinction of the incident radiation through a tunneling process similar to the scenario of barrier penetration in quantum mechanics. the aforesaid tunneling contribution, referred to as the edge effect,... | optical tunneling by arbitrary macroscopic three-dimensional objects |
we calculate regional synthetic seismograms for a realistic structure model beneath greenland, including surface topography and ice sheet thickness, for observations of the multinational greenland ice sheet monitoring network (glisn). the thick and heterogeneous greenland ice sheet can cause distortion of the seismic w... | numerical modeling of seismic waves for estimating the influence of the greenland ice sheet on observed seismograms |
one of the advantages of thermoplastic composites relative to their thermoset counterparts is the possibility of assembling components through welding. ultrasonic welding in particular is very promising for industrialization. however, uncertainty in the fatigue and fracture behaviour of composites is still an obstacle ... | experimental assessment of the influence of welding process parameters on lamb wave transmission across ultrasonically welded thermoplastic composite joints |
we report experiments which characterize spin wave propagation in a thin (111) yttrium iron garnet film for arbitrary angles between the in-plane magnetic field and the mode wavevectors. by measuring the magnetic field evolution of the phase of the wave traveling across the film, we deduce the frequency dependence of t... | phase detection of spin waves in yttrium iron garnet and metal induced nonreciprocity |
a new method, high precision radially-polarized light pupil-filtering differential confocal measurement (rpdcm), is proposed to improve the 3d measurement resolution of confocal system. spdcm uses the property that the radially-polarized-light can produce a strong longitudinal field component after being focused by a h... | high precision radially-polarized-light pupil-filtering differential confocal measurement |
this paper investigates the traveling wave in a nonlocal dispersal susceptible-infected-removed epidemic model with general nonlinear incidence and nonlocal delayed effects. it is shown that the existence and nonexistence of nontrivial traveling waves are fully determined by the basic reproduction number r0 and critica... | wave propagation in a nonlocal dispersal sir epidemic model with nonlinear incidence and nonlocal distributed delays |
a new technique for the calculation of rf waves in toroidal geometry enables the simultaneous incorporation of antenna geometry, plasma facing components (pfcs), the scrape off-layer (sol) and core propagation [shiraiwa et al, "his-toric: extending core icrf wave simulation to include realistic sol plasmas", nucl. fusi... | antenna to core: a new approach to rf modelling |
summarywe consider obstacle identification using wave propagation. in such problems, one wants to find the location, shape, and size of an unknown obstacle from given measurements. we propose an algorithm for the identification task based on a time‑reversed absorbing condition (trac) technique. here, we apply the trac ... | obstacle identification using the trac algorithm with a second‑order abc |
this paper presents the concept of using an additional generator to prevent ground vibrations. a linear, transversally isotropic three dimensional half-space with the hysteretic damping model, acted upon by a harmonic vertical excitation is assumed. equations of motion for the transversally isotropic ground model with ... | a study of the reduction of ground vibrations by an active generator |
luna recently demonstrated a novel optical phase-based algorithm for removing the adverse effects of fiber motion at frequencies far above the scan rate on high-resolution measurements of rayleigh scatter using optical frequency domain reflectometry (ofdr) for static strain and temperature measurements. by comparing dy... | distributed rayleigh scatter dynamic strain sensing above the scan rate with optical frequency domain reflectometry |
for 478 centrally located sunspots observed in the optical continuum with solar dynamics observatory/helioseismic magnetic imager, we perform seismological diagnostics of the physical parameters of umbral photospheres. the new technique is based on the theory of slow magnetoacoustic waves in a non-isothermally stratifi... | determination of the alfvén speed and plasma-beta using the seismology of sunspot umbra |
we present a spectral element method, for simulation of ground-penetrating radar (gpr) in two dimensions. the technique is based upon a weak formulation of the equations of maxwell and combines the flexibility of the elemental-based methods with the accuracy of the spectral based methods. the wave field on the elements... | 2d spectral element modeling of gpr wave propagation in inhomogeneous media |
examining the propagation properties of rayleigh waves in rocks is of notable theoretical and practical significance. in civil engineering and other fields, rayleigh waves can be used to effectively predict various types of defects (such as fractures and cavities) in rocks. in this study, a numerical simulation method ... | rayleigh waves propagation in an elastic medium with discrete subsurface fractures |
in the field of marine engineering, the characteristics of wave propagation play an imperative character. in many geographical regions, the key source of environmental effects on artificial floating or stationary structures or seashores is waves. this article deals with the hirota maccari system (hms) via a new fractio... | exploring the fractional hirota maccari system for its soliton solutions via impressive analytical strategies |
we present an unstructured mesh based numerical technique for modelling elastic wave propagation in heterogeneous media with complex geometrical settings. the scheme is developed by adapting the so-called grid method with a double-mesh implementation. the double-mesh is generated by subdividing each triangular grid of ... | unstructured mesh based elastic wave modelling on gpu: a double-mesh grid method |
the propagation of an electromagnetic wave in a uniaxial ferromagnetic nanowire under the spin transfer torque effect is widely investigated in the soliton frame. the magnetization dynamics of the ferromagnetic nanowire is governed by the landau-lifshitz-gilbert (llg) equation coupled to the maxwell equation for the el... | current-driven electromagnetic soliton collision in a ferromagnetic nanowire |
in this paper, we consider a new spectral finite volume method (fvm) for the elastic wave equations. our new fvm is based on a piecewise constant approximation on a fine mesh and a high-order polynomial reconstruction on a coarser mesh. our new method is constructed based on two existing techniques, the high-order fvm ... | a new spectral finite volume method for elastic wave modelling on unstructured meshes |
magnetic properties of a one-dimensional frustrated quantum spin system rb2cu2mo3o12 is investigated by the muon spin relaxation (μsr) technique. although this system shows an incommensurate spin correlation in neutron scattering, it has not yet been determined whether the ground state reaches to a nonmagnetic spin-sin... | magnetic properties of one-dimensional quantum spin system rb2cu2mo3o12 studied by muon spin relaxation |
the method of wavefront shaping to control optical properties of opaque media is a promising technique for authentication applications. one of the main challenges of this technique is the sensitivity of the wavefront-sample coupling to translation and/or rotation. to better understand how translation and rotation affec... | stability of optimal-wave-front-sample coupling under sample translation and rotation |
concrete-filled steel tube (cfst) members have been widely employed in high-rise buildings or long-span bridges as vertical or axial load-carrying components and the development of efficient interface debonding detection approach for cfst members has been a common concern. in recent years, wave propagation measurement ... | local wave propagation analysis in concrete-filled steel tube with spectral element method using absorbing layers - part i: approach and validation |
coda wave interferometry (cwi) is a highly sensitive monitoring technique built on the sensitivity of elastic coda waves to small changes in a diffusive medium. however, a clear connection between the physical processes involved in the evolution of the medium and the time changes observed by cwi has not been clearly de... | elastic strain effects on wave scattering: implications for coda wave interferometry (cwi) |
within the field of seismic modelling in anisotropic media, dynamic ray tracing is a powerful technique for computation of amplitude and phase properties of the high-frequency green's function. dynamic ray tracing is based on solving a system of hamilton-jacobi perturbation equations, which may be expressed in differen... | higher-order hamilton-jacobi perturbation theory for anisotropic heterogeneous media: transformation between cartesian and ray-centred coordinates |
air-pulse optical coherence elastography (oce) is a promising technique for quantifying biomechanical properties of the cornea. this technique typically involves imaging and analysis of the propagation of the air-pulse induced elastic waves to reconstruct corneal biomechanical properties using an analytical model. howe... | analysis of the effect of the fluid-structure interface on elastic wave velocity in cornea-like structures by oce and fem |
a simplified linearized lattice boltzmann method (sllbm) suitable for the simulation of acoustic waves propagation in fluids was proposed herein. through chapman–enskog expansion analysis, the linearized lattice boltzmann equation (llbe) was first recovered to linearized macroscopic equations. then, using the fractiona... | a simplified linearized lattice boltzmann method for acoustic propagation simulation |
the acoustic black hole (abh) phenomenon can be exploited to manipulate and mitigate flexural wave propagation in thin-walled structures. abh structures feature unique space-dependent wavenumber variation and wave celerity reduction in the tapered abh area, thus posing challenges to the existing modelling techniques. i... | partition of unity finite element method for the modelling of acoustic black hole wedges |
modes of detonation wave propagation in annular channels were investigated numerically by using the adaptive mesh refinement technique. two-dimensional, reactive euler equations with a detailed hydrogen/oxygen reaction model were adopted in the computations to simulate the detonation dynamics in the annular geometry. c... | numerical study of detonation wave propagation modes in annular channels |
we find a dark component guiding the practically interesting bright-bright vector one-soliton to two different parametric domains giving rise to different physical situations by constructing a more general form of three-component dark-bright-bright mixed vector one-soliton solution of the generalized manakov model with... | energy-exchange collisions of dark-bright-bright vector solitons |
a doubly periodic geometric transformation is applied to the problem of out of plane shear wave propagation in a doubly periodic perforated elastic medium. the technique leads to the design of a system of radially anisotropic and inhomogeneous shells surrounding the void inclusions, that can be tuned to give the desire... | control of elastic shear waves by periodic geometric transformation: cloaking, high reflectivity and anomalous resonances |
we present a ray theory for modeling elastic wave propagation in spatially graded mechanical metamaterials. wave propagation in periodic metamaterials has been well studied, motivated by their beneficial wave steering and bandgap properties. by contrast, comparably little work has explored wave propagation in spatially... | ray theory for elastic wave propagation in graded metamaterials |
a technique involving the higher wronskians of a differential equation is presented for analysing the dispersion relation in a class of wave propagation problems. the technique shows that the complicated transcendental-function expressions which occur in series expansions of the dispersion function can, remarkably, be ... | a wronskian method for elastic waves propagating along a tube |
tight clastic reservoirs are an important aspect of hydrocarbon exploration and development worldwide. the xu5 section of the upper triassic xujiahe formation in the western sichuan basin of central china contains tight terrestrial clastic reservoirs. the depth of these reservoirs is greater than 3000 m, while the thic... | a new method for assessing young's modulus and poisson's ratio in tight interbedded clastic reservoirs without a shear wave time difference |
high frequency (hf) communications through ionospheric reflection is a widely used technique specifically for maritime, aeronautical, and emergency services communication with remote areas due to economic and management reasons, and also as backup system. although long distance radio links can be established beyond lin... | ionospheric narrowband and wideband hf soundings for communications purposes: a review |
if it is desired to obtain high rate mechanical data of materials at non-ambient temperatures using the split hopkinson (kolsky) bar technique, it is necessary either to consider what effect a temperature gradient has on the propagation of elastic waves along a metallic rod or to design a mechanism that minimises the e... | the effect of temperature gradients on elastic wave propagation in split hopkinson pressure bars |
in the literature, blood flow study in an arterial segment/arterial network, using one‑dimensional wave propagation model, has been carried out considering flat/parabolic/logarithmic/different degree polynomial velocity profile functions. however, such assumptions are not capable of capturing actual blood and arterial ... | computationally efficient finite element formulation for blood flow analysis in multi‑layered aorta modeled as viscoelastic material |
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