Log in

Relevant bibliographies by topics / ELASTICITY; SURFACE PROPERTIES; SOUND WAVES / Journal articles

To see the other types of publications on this topic, follow the link: ELASTICITY; SURFACE PROPERTIES; SOUND WAVES.

Journal articles on the topic 'ELASTICITY; SURFACE PROPERTIES; SOUND WAVES'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'ELASTICITY; SURFACE PROPERTIES; SOUND WAVES.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Carmichael, Stephen W. "Imaging Based on Elasticity." Microscopy Today 6, no. 7 (1998): 3–4. http://dx.doi.org/10.1017/s1551929500068565.

Full text

Abstract:

There are scores of microscopes that detect different properties of a specimen. Typically we image ‘visible” properties, but, for example, even the commonly-used atomic force microscope detects physical interactions rather than “visible” characteristics, Mostafa Fatemi and James Greenleaf have introduced the principle of imaging the elastic features of a specimen. This is done with sound waves, but we are not talking about just another acoustic microscope.The method demonstrated by Fatemi and Greenleaf uses radiation force to image the acoustic response of a specimen to mechanical excitation.

APA, Harvard, Vancouver, ISO, and other styles

2

Inoue, Kazuko, and Tomio Ariyasu. "Sound waves and shock waves in high-density deuterium." Laser and Particle Beams 9, no. 4 (1991): 795–816. http://dx.doi.org/10.1017/s026303460000656x.

Full text

Abstract:

The possibility of compressing the cryogenic hollow pellet of inertial confinement nuclear fusion with multiple adiabatic shock waves is discussed, on the basis of the estimation of the properties of a high-density deuterium plasma (1024−1027 cm−3, 10−1−104 eV), such as the velocity and the attenuation constant of the adiabatic sound wave, the width of the shock wave, and the surface tension.It is found that in the course of compression the wavelength of the adiabatic sound wave and the width of the weak shock wave sometimes become comparable to or exceed the fuel shell width of the pellet, an

APA, Harvard, Vancouver, ISO, and other styles

3

Gräff, Dominik, Fabian Walter, and Bradley P. Lipovsky. "Crack wave resonances within the basal water layer." Annals of Glaciology 60, no. 79 (2019): 158–66. http://dx.doi.org/10.1017/aog.2019.8.

Full text

Abstract:

ABSTRACTHydraulic processes within and beneath glacial bodies exert a far-reaching control on ice flow through their influence on basal sliding. Within the subglacial system, rapid changes in these processes may excite resonances whose interpretation requires an understanding of the underlying wave mechanics. Here, we explore these mechanics using observations from a kHz-sampled pressure sensor installed in a borehole directly above the hard granite bedrock of a temperate mountain glacier in Switzerland. We apply a previously established theory of wave propagation along thin, water-filled stru

APA, Harvard, Vancouver, ISO, and other styles

4

Li, Yueqiu, Peijun Wei, and Changda Wang. "Propagation of thermoelastic waves across an interface with consideration of couple stress and second sound." Mathematics and Mechanics of Solids 24, no. 1 (2017): 235–57. http://dx.doi.org/10.1177/1081286517736999.

Full text

Abstract:

The reflection and transmission of thermoelastic waves across an interface between two different couple stress solids are studied based on the thermoelastic Green–Naghdi theory with consideration of second sound. First, some thermodynamic equations of a couple stress elastic solid are formulated and the function of free energy density is postulated. Second, equations of thermal motion and heat conduction of the couple stress elasticity are derived and constitutive relations with thermoelastic coupled effects are obtained. From these equations, four kinds of dispersive waves, namely, thermal-me

APA, Harvard, Vancouver, ISO, and other styles

5

Rousseau, Martine, and Gérard A. Maugin. "Rayleigh surface waves and their canonically associated quasi-particles." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467, no. 2126 (2010): 495–507. http://dx.doi.org/10.1098/rspa.2010.0229.

Full text

Abstract:

Inspired by soliton theory and exploiting the conservation law of wave momentum, it is shown that one can associate with the surface Rayleigh wave of macroscopic elasticity a quasi-particle, a ‘surface phonon’, which is in inertial motion for the standard boundary conditions. The ‘mass’ of this ‘particle’ is determined in terms of the wave properties. Different types of alteration in the boundary conditions are shown to result in perturbations of this inertial motion in various ways. The essential tool in the presented derivation is the exploitation of the canonical equations of conservation,

APA, Harvard, Vancouver, ISO, and other styles

6

Otani, Takahiko. "Modeling of Ultrasonic Wave Propagation Path through Cancellous Bone and Quantitative Estimation of Bone Density and Bone Quality." Key Engineering Materials 321-323 (October 2006): 857–61. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.857.

Full text

Abstract:

Osteoporosis is a disease characterized by decreasing bone density, and is assessed by the bone mass density of cancellous bone. An X-ray method is widely used for noninvasive measurement of bone mass density [mg/cm3]. An ultrasonic method has the potential to evaluate the elastic properties, however measured ultrasonic parameters are the slope of frequency dependent attenuation (BUA [dB/MHz]) and the speed of sound (SOS [m/s]), not the bone mass density [mg/cm3]. In previous study, two longitudinal waves, the fast and slow waves, were observed in cancellous bone. In this study, the propagatio

APA, Harvard, Vancouver, ISO, and other styles

7

OU, Z. Y., and D. W. LEE. "EFFECTS OF INTERFACE ENERGY ON MULTIPLE SCATTERING OF PLANE COMPRESSIONAL WAVES BY TWO CYLINDRICAL FIBERS." International Journal of Applied Mechanics 04, no. 04 (2012): 1250040. http://dx.doi.org/10.1142/s1758825112500408.

Full text

Abstract:

The multiple scattering of plane compressional waves by two cylindrical fibers with interface effects is investigated. Based on surface elasticity theory, the wave fields in a nanoscale solid medium can be obtained by applying the eigenfunction expansion method and the Graf's addition theorem. Our results indicate that surface energy significantly affects the diffraction of elastic waves, as the radii of the fibers approach nanometers. The dynamic stress concentration factors at the interfaces between the fibers and the matrix under incident plane compressional waves at different frequencies a

APA, Harvard, Vancouver, ISO, and other styles

8

Sharifineyestani, Elham, and Navid Tahvildari. "A NUMERICAL STUDY ON SURFACE WAVE EVOLUTION OVER VISCOELASTIC MUD." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 64. http://dx.doi.org/10.9753/icce.v36.waves.64.

Full text

Abstract:

A numerical modeling approach is applied to investigate the combined effect of wave-current-mud on the evolution of nonlinear waves. A frequency-domain phase-resolving wave-current model that solves nonlinear wave-wave interactions is used to solve wave evolution. A comparison between the results of numerical wave model and the laboratory experiments confirms the accuracy of the numerical model. The model is then applied to consider the effect of mud properties on nonlinear surface wave evolution. It is shown that resonance effect in viscoelastic mud creates a complex frequency-dependent dissi

APA, Harvard, Vancouver, ISO, and other styles

9

Tang, Zihan, Yue Chen, and Wei Ye. "Calculation of Surface Properties of Cubic and Hexagonal Crystals through Molecular Statics Simulations." Crystals 10, no. 4 (2020): 329. http://dx.doi.org/10.3390/cryst10040329.

Full text

Abstract:

Surface property is an important factor that is widely considered in crystal growth and design. It is also found to play a critical role in changing the constitutive law seen in the classical elasticity theory for nanomaterials. Through molecular static simulations, this work presents the calculation of surface properties (surface energy density, surface stress and surface stiffness) of some typical cubic and hexagonal crystals: face-centered-cubic (FCC) pure metals (Cu, Ni, Pd and Ag), body-centered-cubic (BCC) pure metals (Mo and W), diamond Si, zincblende GaAs and GaN, hexagonal-close-packe

APA, Harvard, Vancouver, ISO, and other styles

10

Mei, Chiang C., and Usama Kadri. "Sound signals of tsunamis from a slender fault." Journal of Fluid Mechanics 836 (December 11, 2017): 352–73. http://dx.doi.org/10.1017/jfm.2017.811.

Full text

Abstract:

Since the speed of sound in water is much greater than that of the surface gravity waves, acoustic signals can be used for early warning of tsunamis. We simplify existing works by treating the sound wave alone without the much slower gravity wave, and derive a two-dimensional theory for signals emanating from a fault of finite length. Under the assumptions of a slender fault and constant sea depth, the asymptotic technique of multiple scales is applied to obtain analytical results. The modal envelopes of the two-dimensional sound waves are found to be governed by the Schrödinger equation and a

APA, Harvard, Vancouver, ISO, and other styles

11

Lou, Ching-Wen, Ting-Ting Li, Chien-Lin Huang, Ying-Hsuan Hsu, and Jia-Horng Lin. "Sound-Absorbing and Flame-Retarding Property of Nonwoven Compounded PU foam Planks." Journal of Engineered Fibers and Fabrics 10, no. 3 (2015): 155892501501000. http://dx.doi.org/10.1177/155892501501000315.

Full text

Abstract:

A nonwoven is an ideal sound-absorbing material due to its high surface area. Surface area of a nonwoven correlates with fiber denier and packing density, and affects the sound absorbing property. With smaller denier, sound waves have great chance to interact with fibers. Moreover, more fibers would produce friction in-between sound waves at high packing density. Besides, a large amount of fabrics are produced in the current textile industry. During the production process, selvages are cut form fabrics and then abandoned, thus leading to amazing wastes after a long period of discarding. This s

APA, Harvard, Vancouver, ISO, and other styles

12

Lebedev, Maxim, Andrej Bóna, Roman Pevzner, and Boris Gurevich. "Elastic anisotropy estimation from laboratory measurements of velocity and polarization of quasi-P-waves using laser interferometry." GEOPHYSICS 76, no. 3 (2011): WA83—WA89. http://dx.doi.org/10.1190/1.3569110.

Full text

Abstract:

A new method for conducting laboratory measurements of the velocities and polarizations of compressional and shear waves in rock samples uses a laser Doppler interferometer (LDI). LDI can measure the particle velocity of a small (0.03 mm2) element of the surface of the sample along the direction of the laser beam. By measuring the particle velocity of the same surface element in three linearly independent directions and then transforming those velocities to Cartesian coordinates, three orthogonal components of the particle-velocity vector are obtained. Thus, LDI can be used as a localized thre

APA, Harvard, Vancouver, ISO, and other styles

13

Lapčík, Lubomír, Martin Vašina, Barbora Lapčíková, et al. "Materials characterization of advanced fillers for composites engineering applications." Nanotechnology Reviews 8, no. 1 (2019): 503–12. http://dx.doi.org/10.1515/ntrev-2019-0045.

Full text

Abstract:

Abstract Four different minerals were investigated; hollow spheres of calcium carbonate, platy mica, needle like wollastonite and glassy perlite and characterized via iGC for surface energy, Freeman powder rheology for flow characterization, cyclic uniaxial die compaction for modulus of elasticity and frequency dependent sound absorption properties. Particle surface energy and particle shape strongly affected the packing density of powder beds. In the case of higher porosity and thus lower bulk density, the powders acoustic absorption was higher in comparison with higher packing density materi

APA, Harvard, Vancouver, ISO, and other styles

14

Ziemann, A., K. Arnold, and A. Raabe. "Acoustic tomography in the atmospheric surface layer." Annales Geophysicae 17, no. 1 (1999): 139–48. http://dx.doi.org/10.1007/s00585-999-0139-9.

Full text

Abstract:

Abstract. Acoustic tomography is presented as a technique for remote monitoring of meteorological quantities. This method and a special algorithm of analysis can directly produce area-averaged values of meteorological parameters. As a result consistent data will be obtained for validation of numerical atmospheric micro-scale models. Such a measuring system can complement conventional point measurements over different surfaces. The procedure of acoustic tomography uses the horizontal propagation of sound waves in the atmospheric surface layer. Therefore, to provide a general overview of sound p

APA, Harvard, Vancouver, ISO, and other styles

15

Diez, A., and O. Eisen. "Seismic wave propagation in anisotropic ice – Part 1: Elasticity tensor and derived quantities from ice-core properties." Cryosphere 9, no. 1 (2015): 367–84. http://dx.doi.org/10.5194/tc-9-367-2015.

Full text

Abstract:

Abstract. A preferred orientation of the anisotropic ice crystals influences the viscosity of the ice bulk and the dynamic behaviour of glaciers and ice sheets. Knowledge about the distribution of crystal anisotropy is mainly provided by crystal orientation fabric (COF) data from ice cores. However, the developed anisotropic fabric influences not only the flow behaviour of ice but also the propagation of seismic waves. Two effects are important: (i) sudden changes in COF lead to englacial reflections, and (ii) the anisotropic fabric induces an angle dependency on the seismic velocities and, th

APA, Harvard, Vancouver, ISO, and other styles

16

Pierce, A. D. "Waves on Fluid-Loaded Inhomogeneous Elastic Shells of Arbitrary Shape." Journal of Vibration and Acoustics 115, no. 4 (1993): 384–90. http://dx.doi.org/10.1115/1.2930361.

Full text

Abstract:

A generalization of the Donnell model for a thin shell of arbitrary shape, and with position-dependent elastic and geometric properties, is used to formulate a wave theory for quasi-straight-crested waves of constant frequency propagating over the shell’s surface. The principal restriction on the theory is that the wavenumber components must be large compared with the two principal curvatures. A simple method for including fluid loading in the model yields a finite local specific radiation impedance even when the waves on the surface are moving with the fluid’s sound speed. The overall model i

APA, Harvard, Vancouver, ISO, and other styles

17

Qu, Renhao, Jingwen Guo, Yi Fang, and Siyang Zhong. "Sound reflection of acoustic porous metasurfaces under uniform mean flow." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (2021): 2601–8. http://dx.doi.org/10.3397/in-2021-2182.

Full text

Abstract:

Acoustic metasurfaces are artificial 2D structures with a sub-wavelength thickness that can realize some exotic properties such as non-trivial refraction, broadband and low frequency absorption. However, most relevant studies are still in a static medium, hindering their realistic applications in aviation, where background flow exists. To address it, the effects of mean flow on the acoustic performance of metasurfaces, which is designed based on the generalized Snell's law (GSL) to achieve anomalous reflections, are systemically studied. Firstly, an analytical model of GSL taking the effect of

APA, Harvard, Vancouver, ISO, and other styles

18

Guliyev, H., Kh Aghayev, F. Mehraliyev, and E. Ahmadova. "DETERMINATION OF THE PHYSICAL PROPERTIES OF COMPLEXLY CONSTRUCTED MEDIA USING NEAR-SURFACE CROSSWELL METHOD." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 3 (86) (2019): 13–20. http://dx.doi.org/10.17721/1728-2713.86.02.

Full text

Abstract:

In case when the upper part of the medium has complex geological structure and geodynamic processes occur in it, the necessity of these data increases in projecting of the object under construction. Purpose. Studying of acoustic, elastic and anisotropic properties of the upper part of section of complicatedly constructed geological media. Methodology. Seismic observations are conducted in shallow wells in the areas of construction objects located in various seismogeological conditions by NSCW (Near-Surface Cross Well testing) method. Field seismic records are processed. Kinematic and dynamic p

APA, Harvard, Vancouver, ISO, and other styles

19

Diez, A., and O. Eisen. "Seismic wave propagation in anisotropic ice – Part 1: Elasticity tensor and derived quantities from ice-core properties." Cryosphere Discussions 8, no. 4 (2014): 4349–95. http://dx.doi.org/10.5194/tcd-8-4349-2014.

Full text

Abstract:

Abstract. A preferred orientation of the anisotropic ice crystals influences the viscosity of the ice bulk and the dynamic behaviour of glaciers and ice sheets. Knowledge about the distribution of crystal anisotropy, to understand its contribution to ice dynamics, is mainly provided by crystal orientation fabric (COF) data from ice cores. However, the developed anisotropic fabric does not only influence the flow behaviour of ice, but also the propagation of seismic waves. Two effects are important: (i) sudden changes in COF lead to englacial reflections and (ii) the anisotropic fabric induces

APA, Harvard, Vancouver, ISO, and other styles

20

Li, Chunhui, Guangying Guan, Roberto Reif, Zhihong Huang, and Ruikang K. Wang. "Determining elastic properties of skin by measuring surface waves from an impulse mechanical stimulus using phase-sensitive optical coherence tomography." Journal of The Royal Society Interface 9, no. 70 (2011): 831–41. http://dx.doi.org/10.1098/rsif.2011.0583.

Full text

Abstract:

The mechanical properties of skin are important tissue parameters that are useful for understanding skin patho-physiology, which can aid disease diagnosis and treatment. This paper presents an innovative method that employs phase-sensitive spectral-domain optical coherence tomography (PhS-OCT) to characterize the biomechanical properties of skin by measuring surface waves induced by short impulses from a home-made shaker. Experiments are carried out on single and double-layer agar–agar phantoms, of different concentrations and thickness, and on in vivo human skin, at the forearm and the palm.

APA, Harvard, Vancouver, ISO, and other styles

21

Zhong, Siyang, and Xin Zhang. "A sound extrapolation method for aeroacoustics far-field prediction in presence of vortical waves." Journal of Fluid Mechanics 820 (May 8, 2017): 424–50. http://dx.doi.org/10.1017/jfm.2017.219.

Full text

Abstract:

Off-surface integral solutions to an inhomogeneous wave equation based on acoustic analogy could suffer from spurious wave contamination when volume integrals are ignored for computation efficiency and vortical/turbulent gusts are convected across the integration surfaces, leading to erroneous far-field directivity predictions. Vortical gusts often exist in aerodynamic flows and it is inevitable their effects are present on the integration surface. In this work, we propose a new sound extrapolation method for acoustic far-field directivity prediction in the presence of vortical gusts, which ov

APA, Harvard, Vancouver, ISO, and other styles

22

Belakova, D., A. Seile, S. Kukle, and T. Plamus. "Non-Wovens as Sound Reducers." Latvian Journal of Physics and Technical Sciences 55, no. 2 (2018): 64–76. http://dx.doi.org/10.2478/lpts-2018-0014.

Full text

Abstract:

Abstract Within the present study, the effect of hemp (40 wt%) and polyactide (60 wt%), non-woven surface density, thickness and number of fibre web layers on the sound absorption coefficient and the sound transmission loss in the frequency range from 50 to 5000 Hz is analysed. The sound insulation properties of the experimental samples have been determined, compared to the ones in practical use, and the possible use of material has been defined. Non-woven materials are ideally suited for use in acoustic insulation products because the arrangement of fibres produces a porous material structure

APA, Harvard, Vancouver, ISO, and other styles

23

Singh, Dilbag, Davinder Kumar, and S. K. Tomar. "Plane harmonic waves in a thermoelastic solid with double porosity." Mathematics and Mechanics of Solids 25, no. 4 (2020): 869–86. http://dx.doi.org/10.1177/1081286519890053.

Full text

Abstract:

Propagation of time harmonic plane waves in an infinite thermoelastic solid medium with double porosity is studied in this paper. It is found that there may exist five basic waves consisting of four sets of coupled longitudinal waves and an independent transverse wave traveling at different speeds. Each set of coupled longitudinal waves is found to be dispersive, attenuating and depends upon the presence of both types of voids and thermal properties in the medium. The lone transverse wave is found to be non-dispersive and non-attenuating, and does not depend on the presence of voids and therma

APA, Harvard, Vancouver, ISO, and other styles

24

Barnes, G., and P. S. Cally. "Frequency Dependent Ray Paths in Local Helioseismology." Publications of the Astronomical Society of Australia 18, no. 3 (2001): 243–51. http://dx.doi.org/10.1071/as01040.

Full text

Abstract:

AbstractThe surface of the Sun is continually oscillating due to sound waves encroaching on it from the interior. Measurements of the surface velocity are used to infer some of the properties of the regions through which the sound waves have propagated. Traditionally, this has been done by using a modal decomposition of the surface disturbances. However, the use of ray descriptions, in the form of acoustic holography or time–distance helioseismology, provides an alternative approach which may reveal more detailed information about the properties of local phenomena such as sunspots and active r

APA, Harvard, Vancouver, ISO, and other styles

25

McCall, K. R., and R. A. Guyer. "A new theoretical paradigm to describe hysteresis, discrete memory and nonlinear elastic wave propagation in rock." Nonlinear Processes in Geophysics 3, no. 2 (1996): 89–101. http://dx.doi.org/10.5194/npg-3-89-1996.

Full text

Abstract:

Abstract. The velocity of sound in rock is a strong function of pressure, indicating that wave propagation in rocks is very nonlinear. The quasistatic elastic properties of rocks axe hysteretic, possessing discrete memory. In this paper a new theory is developed, placing all of these properties (nonlinearity, hysteresis, and memory) on equal footing. The starting point of the new theory is closer to a microscopic description of a rock than the starting point of the traditional five-constant theory of nonlinear elasticity. However, this starting point (the number density ρ of generic mechanical

APA, Harvard, Vancouver, ISO, and other styles

26

Ailawalia, Praveen, and Priyanka. "Wave propagation in a temperature rate-dependent semiconducting medium with hydrostatic initial stress." International Journal of Computational Materials Science and Engineering 10, no. 02 (2021): 2150011. http://dx.doi.org/10.1142/s2047684121500111.

Full text

Abstract:

The aim of this paper is to investigate the effect of hydrostatic initial stress and temperature dependence of the modulus of elasticity on surface wave propagation in the semiconducting medium under photothermal theory. An infinite elastic half-space is overlying the infinite semiconducting medium and a mechanical force of constant magnitude is applied along with the interface. Surface wave solutions are used to solve the coupled plasma, thermal, and elastic wave equations. The effect of hydrostatic initial stress and temperature dependent properties have been studied and depicted graphically

APA, Harvard, Vancouver, ISO, and other styles

27

Miranda, Edson, Clodualdo Aranas, Samuel Rodrigues, et al. "Dispersion Diagram of Trigonal Piezoelectric Phononic Structures with Langasite Inclusions." Crystals 11, no. 5 (2021): 491. http://dx.doi.org/10.3390/cryst11050491.

Full text

Abstract:

The dispersion relation of elastic Bloch waves in 1-3 piezoelectric phononic structures (PPnSs) with Langasite (La3Ga5SiO14) inclusions in a polymeric matrix is reported. Langasite presents promising material properties, for instance good temperature behaviour, high piezoelectric coupling, low acoustic loss and high quality factor. Furthermore, Langasite belongs to the point group 32 and has a trigonal structure. Thus, the 2-D bulk wave propagation in periodic systems with Langasite inclusions cannot be decoupled into XY and Z modes. The improved plane wave expansion (IPWE) is used to obtain t

APA, Harvard, Vancouver, ISO, and other styles

28

Diez, A., O. Eisen, C. Hofstede, et al. "Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data." Cryosphere 9, no. 1 (2015): 385–98. http://dx.doi.org/10.5194/tc-9-385-2015.

Full text

Abstract:

Abstract. We investigate the propagation of seismic waves in anisotropic ice. Two effects are important: (i) sudden changes in crystal orientation fabric (COF) lead to englacial reflections; (ii) the anisotropic fabric induces an angle dependency on the seismic velocities and, thus, recorded travel times. Velocities calculated from the polycrystal elasticity tensor derived for the anisotropic fabric from measured COF eigenvalues of the EDML ice core, Antarctica, show good agreement with the velocity trend determined from vertical seismic profiling. The agreement of the absolute velocity values

APA, Harvard, Vancouver, ISO, and other styles

29

Diez, A., O. Eisen, C. Hofstede, et al. "Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data." Cryosphere Discussions 8, no. 4 (2014): 4397–430. http://dx.doi.org/10.5194/tcd-8-4397-2014.

Full text

Abstract:

Abstract. We investigate the propagation of seismic waves in anisotropic ice. Two effects are important: (i) sudden changes in crystal orientation fabric (COF) lead to englacial reflections; (ii) the anisotropic fabric induces an angle dependency on the seismic velocities and, thus, recorded traveltimes. Velocities calculated from the polycrystal elasticity tensor derived for the anisotropic fabric from measured COF eigenvalues of the EDML ice core, Antarctica, show good agreement with the velocity trend determined from a vertical seismic profiling. The agreement of the absolute velocity value

APA, Harvard, Vancouver, ISO, and other styles

30

Baev, A. R., A. L. Mayorov, M. V. Asadchaya, V. N. Levkovich, and K. G. Zhavoronkov. "Features of the Surface and Subsurface Waves Application for Ultrasonic Evaluation of Physicomechanical Properties of Solids. Part 1. Influence of the Geometrical Parameters." Devices and Methods of Measurements 9, no. 4 (2018): 325–26. http://dx.doi.org/10.21122/2220-9506-2018-9-4-325-326.

Full text

Abstract:

Application of surface and subsurface waves for control of objects with a double-layer structure allows to extend possibilities of diagnostics of their physico-mechanical properties. The purpose of work was to determine conditions and offer recommendations providing measuring of ultrasonic velocity and amplitude of the former modes in protective layers and in basis of object at one-sided access to its surface.The analysis of an acoustic path of a measuring system in relation to ultrasonic evaluation of the objects having the restricted sizes and the protective coating according to velocity dat

APA, Harvard, Vancouver, ISO, and other styles

31

Singh, B., L. Singh, and S. Deswal. "Reflection of Plane Waves in a Rotating Temperature-Dependent Thermoelastic Solid with Diffusion." Journal of Mechanics 28, no. 4 (2012): 599–606. http://dx.doi.org/10.1017/jmech.2012.101.

Full text

Abstract:

ABSTRACTThe governing equations of a model of rotating generalized thermoelastic diffusion in an isotropic medium with temperature-dependent mechanical properties are formulated in context of Lord-Shulman theory of generalized thermoelasticity. The modulus of elasticity is taken as a linear function of reference temperature. The solution of the governing equations indicates the existence of four coupled plane waves in x-z plane. The reflection of plane waves from the free surface of a rotating temperature-dependent thermoelastic solid half-space with diffusion is considered. The required bound

APA, Harvard, Vancouver, ISO, and other styles

32

Kozaczka, Eugeniusz, and Grażyna Grelowska. "Theoretical Model of Acoustic Wave Propagation in Shallow Water." Polish Maritime Research 24, no. 2 (2017): 48–55. http://dx.doi.org/10.1515/pomr-2017-0049.

Full text

Abstract:

Abstract The work is devoted to the propagation of low frequency waves in a shallow sea. As a source of acoustic waves, underwater disturbances generated by ships were adopted. A specific feature of the propagation of acoustic waves in shallow water is the proximity of boundaries of the limiting media characterised by different impedance properties, which affects the acoustic field coming from a source situated in the water layer “deformed” by different phenomena. The acoustic field distribution in the real shallow sea is affected not only by multiple reflections, but also by stochastic change

APA, Harvard, Vancouver, ISO, and other styles

33

Manasseh, Richard, Alexander V. Babanin, Cameron Forbes, Kate Rickards, Irena Bobevski, and Andrew Ooi. "Passive Acoustic Determination of Wave-Breaking Events and Their Severity across the Spectrum." Journal of Atmospheric and Oceanic Technology 23, no. 4 (2006): 599–618. http://dx.doi.org/10.1175/jtech1853.1.

Full text

Abstract:

Abstract A passive acoustic method of detecting breaking waves of different scales has been developed. The method also showed promise for measuring breaking severity. Sounds were measured by a subsurface hydrophone in various wind and wave states. A video record of the surface was made simultaneously. Individual sound pulses corresponding to the many individual bubble formations during wave-breaking events typically last only a few tens of milliseconds. Each time a sound-level threshold was exceeded, the acoustic signal was captured over a brief window typical of a bubble formation pulse, regi

APA, Harvard, Vancouver, ISO, and other styles

34

Józefczak, Arkadiusz, Tomasz Hornowski, Anita Król, Matúš Molčan, Błażej Leszczyński, and Milan Timko. "The Effect of Sonication on Acoustic Properties of Biogenic Ferroparticle Suspension." Archives of Acoustics 41, no. 1 (2016): 161–68. http://dx.doi.org/10.1515/aoa-2016-0016.

Full text

Abstract:

Abstract Superparamagnetic iron oxide nanoparticles (SPION) synthesised chemically usually need the modification of the particle surface. Other natural sources of magnetic particles are various magnetotactic bacteria. Magnetosomes isolated from magnetotactic bacteria are organelles consisting of magnetite (Fe3O4) or greigite (Fe3S4) crystals enclosed by a biological membrane. Magnetotactic bacteria produce their magnetic particles in chains. The process of isolation of magnetosome chains from the body of bacteria consists of a series of cycles of centrifugation and magnetic decantation. Using

APA, Harvard, Vancouver, ISO, and other styles

35

Li, Qing Tian. "Electron Micro Technology Study on BN Fiber’s Microcosmic Structure and Mechanics Properties." Advanced Materials Research 588-589 (November 2012): 104–7. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.104.

Full text

Abstract:

This paper uses transmission electron microscope technology, studies microcosmic structure’ s feature of BN fiber, clarifies existing crystal structure’s state of BN fiber during its producing and transform course. It is studied that BN fiber has a sound mechanical properties, which most of crystalline phase is turbine layer phase and whose nitrogen is high and size is small .During the course of BN fiber’s producing, adding suitable tension from axial can promote directional arrange of BN fiber’s surface crystalline grain and put forward the improving direction of manufacturing technology in

APA, Harvard, Vancouver, ISO, and other styles

36

Candelier, Julien, Stéphane Le Dizès, and Christophe Millet. "Inviscid instability of a stably stratified compressible boundary layer on an inclined surface." Journal of Fluid Mechanics 694 (February 2, 2012): 524–39. http://dx.doi.org/10.1017/jfm.2012.7.

Full text

Abstract:

AbstractThe three-dimensional stability of an inflection-free boundary layer flow of length scale$L$and maximum velocity${U}_{0} $in a stably stratified and compressible fluid of constant Brunt–Väisälä frequency$N$, sound speed${c}_{s} $and stratification length$H$is examined in an inviscid framework. The shear plane of the boundary layer is assumed to be inclined at an angle$\theta $with respect to the vertical direction of stratification. The stability analysis is performed using both numerical and theoretical methods for all the values of$\theta $and Froude number$F= {U}_{0} / (LN)$. When n

APA, Harvard, Vancouver, ISO, and other styles

37

TARYANA, NANDANG. "Sonolog Test Sumur Minyak menggunakan Alat Total Well Management Echometer sebagai Well Analyzer Sumur di Pertamina EP Subang." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 2, no. 2 (2014): 152. http://dx.doi.org/10.26760/elkomika.v2i2.152.

Full text

Abstract:

ABSTRAK Metoda Sonolog Tes adalah metoda dengan menggunakan sifat refleksi gelombang bunyi, digunakan untuk analisa sumur. Metoda Sonolog Tes menggunakan alat Total Well Managemen (TWM) sebagai Well Analyzer yang digunakan untuk memperoleh data keperluan analisa performance sumur. Informasi tentang data sumur ini dapat diperoleh dengan menggunakan gas gun sebagai sumber gelombang bunyi yang ditembakan ke sumur. Hasil refleksi dari dalam sumur direkam dalam bentuk grafik yang direkam di komputer. Refleksi yang kuat (down kick) dari gelombang bunyi tercatat pada 14.827 detik yang mengindikasikan

APA, Harvard, Vancouver, ISO, and other styles

38

Khokhryakova, C. A., A. I. Shmyrova, I. A. Mizeva, and A. V. Shmyrov. "The experimental study of ferrocolloid surface tension in a magnetic field." Вестник Пермского университета. Физика, no. 3 (2020): 56–64. http://dx.doi.org/10.17072/1994-3598-2020-3-56-64.

Full text

Abstract:

Direct measurements of surface tension, viscosity and surface elasticity under the action of external forces are often impossible. In many tasks, the magnetic fluid surface tension is considered to be independent of the magnitude of the applied magnetic field and is determined by the properties of the base fluid. The anisotropy of the magnetic properties at the interface due to the jump in the fluid’s magnetization suggests the dependence of the surface tension tensor on the magnetic field. In this paper, we propose a new experimental method for studying the surface tension of a magnetic fluid

APA, Harvard, Vancouver, ISO, and other styles

39

Japsen, Peter, Anders Bruun, Ida L. Fabricius, and Gary Mavko. "Identification of hydrocarbons in chalk reservoirs from surface seismic data: South Arne field, North Sea." Geological Survey of Denmark and Greenland (GEUS) Bulletin 7 (July 29, 2005): 13–16. http://dx.doi.org/10.34194/geusb.v7.4823.

Full text

Abstract:

Seismic data are mainly used to map out structures in the subsurface, but are also increasingly used to detect differences in porosity and in the fluids that occupy the pore space in sedimentary rocks. Hydrocarbons are generally lighter than brine, and the bulk density and sonic velocity (speed of pressure waves or P-wave velocity) of hydrocarbon-bearing sedimentary rocks are therefore reduced compared to non-reservoir rocks. However, sound is transmitted in different wave forms through the rock, and the shear velocity (speed of shear waves or S-wave velocity) is hardly affected by the density

APA, Harvard, Vancouver, ISO, and other styles

40

Gacem, Amel, A. Doghmane, and Z. Hadjoub. "Quantification the Effect of the Thickness of Thin Films on their Elastic Parameters." Advanced Materials Research 324 (August 2011): 93–96. http://dx.doi.org/10.4028/www.scientific.net/amr.324.93.

Full text

Abstract:

The determination of the characteristics and properties of thin films deposited on substrates is necessary in any device application in various fields. Adequate mechanical properties are highly required for the majority of surface waves and semiconductor devices. In this context, modelling the ultrasonic-material interaction, we present results of simulation curves of acoustic signatures for multiple thin film/substrate combinations. The results obtained on several structures (Al, SiO2, ZnO, Cu, AlN, SiC and Cr)/(Al2O3, Si, Cu or Quartz) showed a velocity dispersion of the Rayleigh wave as a f

APA, Harvard, Vancouver, ISO, and other styles

41

Zheng, Lu, Hui Dong, Xiaoyu Wu, et al. "Interferometric imaging of nonlocal electromechanical power transduction in ferroelectric domains." Proceedings of the National Academy of Sciences 115, no. 21 (2018): 5338–42. http://dx.doi.org/10.1073/pnas.1722499115.

Full text

Abstract:

The electrical generation and detection of elastic waves are the foundation for acoustoelectronic and acoustooptic systems. For surface acoustic wave devices, microelectromechanical/nanoelectromechanical systems, and phononic crystals, tailoring the spatial variation of material properties such as piezoelectric and elastic tensors may bring significant improvements to the system performance. Due to the much slower speed of sound than speed of light in solids, it is desirable to study various electroacoustic behaviors at the mesoscopic length scale. In this work, we demonstrate the interferomet

APA, Harvard, Vancouver, ISO, and other styles

42

Chanda, Ayan, and Swaroop Nandan Bora. "Propagation of Oblique Waves Over a Small Undulating Elastic Bottom Topography in a Two-Layer Fluid Flowing Through a Channel." International Journal of Applied Mechanics 12, no. 02 (2020): 2050023. http://dx.doi.org/10.1142/s1758825120500234.

Full text

Abstract:

A hydrodynamic model, with the incorporation of elasticity, is considered to study oblique incident waves propagating over a small undulation on an elastic bed in a two-layer fluid, where the upper layer fluid is bounded above by a rigid lid, which is an approximation to the free surface. Following the Euler–Bernoulli beam equation, the elastic bed is approximated as a thin elastic plate. The surface tension at the interface of the layers is completely ignored since its contribution will be minimal. The behavior and properties of the roots of the dispersion relation are analyzed using counting

APA, Harvard, Vancouver, ISO, and other styles

43

Kalinova, Klara. "Sound absorptive light comprising nanofibrous resonant membrane applicable in room acoustics." Building Services Engineering Research and Technology 39, no. 3 (2017): 362–70. http://dx.doi.org/10.1177/0143624417733404.

Full text

Abstract:

Room acoustic solutions are based on measurements of the acoustic power of the room and acoustic elements with different functions (absorption tiles, absorption ceilings, absorption bodies, diffusers, barriers). This work is focused only on absorption elements with an emphasis on addressing lower-middle frequencies. The design of the material is based on broad band noise. Damping of lower frequencies is restricted to a certain extent by the final thickness of the acoustic material. Nanofibrous resonant membranes will be used in the design to achieve higher sound absorption at lower frequencies

APA, Harvard, Vancouver, ISO, and other styles

44

ZAKIR’YANOVA, G. K., and L. A. ALEXEYEVA. "The first boundary value problem of the dynamics of an anisotropic elastic half-space under the action of subsonic transport loads." Bulletin of the National Engineering Academy of the Republic of Kazakhstan 4, no. 78 (2020): 45–52. http://dx.doi.org/10.47533/2020.1606-146x.31.

Full text

Abstract:

The first boundary value problem of the theory of elasticity for an anisotropic elastic half-space is solved when a transport load moves along its surface. The subsonic Raleigh case is considered, when the velocity of motion is less than the velocity of propagation of bulk and surface elastic waves. The Green’s tensor of the transport boundary value problem is constructed and on its basis the solution of boundary value problems for a wide class of distributed traffic loads is given. To solve the problem, the methods of tensor and linear algebra, integral Fourier transform, and operator method

APA, Harvard, Vancouver, ISO, and other styles

45

ZAKIR’YANOVA, G. K., and L. A. ALEXEYEVA. "The first boundary value problem of the dynamics of an anisotropic elastic half-space under the action of subsonic transport loads." Bulletin of the National Engineering Academy of the Republic of Kazakhstan 4, no. 78 (2020): 45–52. http://dx.doi.org/10.47533/2020.1606-146x.31.

Full text

Abstract:

The first boundary value problem of the theory of elasticity for an anisotropic elastic half-space is solved when a transport load moves along its surface. The subsonic Raleigh case is considered, when the velocity of motion is less than the velocity of propagation of bulk and surface elastic waves. The Green’s tensor of the transport boundary value problem is constructed and on its basis the solution of boundary value problems for a wide class of distributed traffic loads is given. To solve the problem, the methods of tensor and linear algebra, integral Fourier transform, and operator method

APA, Harvard, Vancouver, ISO, and other styles

46

González, Genaro, Albert Samper, and Blas Herrera. "ACOUSTIC SIMULATION OF THE CENTRAL HALL IN PALAU GÜELL BY GAUDÍ." Architecture and Engineering 6, no. 2 (2021): 18–30. http://dx.doi.org/10.23968/2500-0055-2021-6-2-18-30.

Full text

Abstract:

Introduction: Quadric surfaces are commonly used in buildings due to their geometric ability to distribute and focus sound waves. The Central Hall in Palau Güell — a UNESCO World Heritage Site — is topped by an ellipsoidal dome. Antoni Gaudí envisaged this room as a concert hall where the organ and the dome play a lead role. Methods: The two previously mentioned elements are the main subject of our paper, which serves two purposes: 1) determining the values of the acoustic parameters of the hall through onsite measurement and also through simulation, and 2) using the geometric parameters of th

APA, Harvard, Vancouver, ISO, and other styles

47

BUCKINGHAM, MICHAEL J., ERIC M. GIDDENS, FERNANDO SIMONET, and THOMAS R. HAHN. "PROPELLER NOISE FROM A LIGHT AIRCRAFT FOR LOW-FREQUENCY MEASUREMENTS OF THE SPEED OF SOUND IN A MARINE SEDIMENT." Journal of Computational Acoustics 10, no. 04 (2002): 445–64. http://dx.doi.org/10.1142/s0218396x02001760.

Full text

Abstract:

The sound from a light aircraft in flight is generated primarily by the propeller, which produces a sequence of harmonics in the frequency band between about 80 Hz and 1 kHz. Such an airborne sound source has potential in underwater acoustics applications, including inversion procedures for determining the wave properties of marine sediments. A series of experiments has recently been performed off the coast of La Jolla, California, in which a light aircraft was flown over a sensor station located in a shallow (approximately 15 m deep) ocean channel. The sound from the aircraft was monitored wi

APA, Harvard, Vancouver, ISO, and other styles

48

Squire, V. A., P. J. Langhorne, W. H. Robinson, A. J. Heine, and T. G. Haskell. "Moving loads on sea ice." Polar Record 23, no. 146 (1987): 569–75. http://dx.doi.org/10.1017/s0032247400008068.

Full text

Abstract:

ABSTRACTA load moving on sea ice, whether the weight of a vehicle or the pressure exerted by a low-flying aircraft, produces a deflection which can in extreme cases cause ice failure. The magnitude and shape of the deflection profile depends on the weight and speed of the vehicle) and also the the ice thickness and properties, with flexuralgraviry waves radiating from the source at speeds above a critical value. This wave pattern was studied in detail on flat, snow-free sea ice in McMurdo Sound, Antarctica. Surface strain was measured directly and microcracking activity monitored to correlate

APA, Harvard, Vancouver, ISO, and other styles

49

Clark, Alfred V. "Ultrasonic Characterization of Texture and Formability." MRS Bulletin 13, no. 4 (1988): 40–43. http://dx.doi.org/10.1557/s088376940006588x.

Full text

Abstract:

There are now theories which predict the effect of texture on elastic properties and hence on the velocities of bulk, surface, and guided ultrasonic waves. Furthermore, there is a relation between texture and formability. These relationships can be potentially exploited to make ultrasonic measurements of formability, and partial pole figures can be made with ultrasonic techniques.This article presents results of various ultrasonic measurements made to characterize the formability of rolled steel and aluminum alloy sheet. A good correlation generally exists between ultrasonic velocity measureme

APA, Harvard, Vancouver, ISO, and other styles

50

Liang, S. M., and J. C. Yuan. "Numerical Simulation of Blast-Wave Propagation in a Small Two-Medium Duct." Journal of Mechanics 25, no. 3 (2009): 313–22. http://dx.doi.org/10.1017/s172771910000277x.

Full text

Abstract:

AbstractIn this study, a small two-medium duct with blast-wave propagation is numerically investigated by a high-resolution Euler/Navier-Stokes solver. The solver has a feature of treatment of the Tait equations of state for two media. One of the two media is water which is envisaged as a blood. The second medium is another liquid, used to simulate body's clot or tissue. The duct wall has a mass diffusion effect in addition to viscous effects. Since two different media are considered, the reflection and transmission of an underwater blast wave passing through the interfaces of the two media wi

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!