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A. A. Zainal - One of the best experts on this subject based on the ideXlab platform.
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P-SV wave diffusion in fluid-Saturated Medium
Malaysian Journal of Fundamental and Applied Sciences, 2014Co-Authors: C. C. Dennis Ling, A. A. ZainalAbstract:Propagating P-SV waves in the fluid-Saturated Mediums are categorized to fall into two distinct groups: insoluble and soluble Mediums. These waves are known as surface Rayleigh waves. By introducing these waves with slowness in accordance to Snell Law, the diffusive and rotating waves are obtained. The results bear out that the propagating P-SV waves in soluble Medium share similar diffusion characteristic as of insoluble Medium while the discussions on fluid density in the Mediums show that high density fluid promotes diffusive characteristic while low density fluid endorses nondiffusive P-SV waves. There is a compressed zone during the propagation of P-SV waves in Medium Saturated with high density fluids.
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Scattering of SH Waves in Fluid Saturated Medium
Applied mathematical sciences, 2010Co-Authors: A. A. Zainal, C. C. Dennis Ling, S. Y. FaisalAbstract:The deviation in SH-waves’ velocities is expected once the saturation degree in the Medium is asymmetrical. Hence, SH-waves’ propagation in the porous Medium Saturated with asymmetry ∞uid density is studied for the difiusive proflles. SH-waves are propagated in similar directions and also opposite directions with the Mediums fall into two distinctive groups: insoluble as well as soluble Mediums. In similar direction of propagation, low density ∞uid revokes the difiusive characteristics while high density ∞uid promotes difiusive attribute. However, the difiusive SH-waves are as well found in the Medium Saturated with low density ∞uid when the ∞uid is asymmetrical in density. In the case of opposite direction of propagation, the recurring SH-waves are found in the Medium Saturated with low and asymmetry density ∞uid. Mathematics Subject Classiflcation: 86A15, 74J30, 86A17
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SH Waves Diffusion in Fluid-Saturated Medium
Journal of Mathematics and Statistics, 2010Co-Authors: C. C. Dennis Ling, S. Y. Faisal, A. A. ZainalAbstract:Problem statement: Characteristics of the seismic waves have been studied mainly the amplitudes, attenuation, frequency, porosity and the velocity of the waves. In this study, the SH-waves were studied for the diffusion which was related to the diffraction of SH-waves in the Saturated Medium. Approach: The elastic wave equation was being used to show the SH-waves. A comparison was made of the propagating SH-waves in the fluid-Saturated Mediums that were categorized into two distinct groups: Insoluble and soluble Mediums. Results: The discussions on fluid density in the Mediums showed that high density fluid promotes diffusive characteristic while low density fluid endorses non diffusive SH-wave. However, the diffraction had induced significant shock wave in the Medium Saturated with low density fluid. Conclusion: These results indicated that the linear seismic waves are able to transform into nonlinear waves.
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P-wave diffusion in fluid-Saturated Medium
Mathematika, 2010Co-Authors: C. C. Dennis Ling, S. Y. Faisal, A. A. ZainalAbstract:This paper considers the propagating P-waves in the fluid-Saturated medi- ums that are categorized to fall into two distinct groups: insoluble and soluble medi- ums. P-waves are introduced with slowness in accordance to Snell Law and are shown to relate to the Medium displacement and wave diffusion. Consequently, the results bear out that the propagating P-waves in the soluble Medium share similar diffusive characteristic as of insoluble Medium. Nonetheless, our study on fluid density in the Mediums show that high density fluid promotes diffusive characteristic whiles low den- sity fluid endorses non-diffusive P-wave.
Dennis Ling Chuan Ching - One of the best experts on this subject based on the ideXlab platform.
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SV-WAVE WITH EXTERNAL FORCE IN Saturated Medium
Jurnal Teknologi, 2016Co-Authors: Teng Lie Siang, Zainal Abdul Aziz, Dennis Ling Chuan ChingAbstract:There are past researches done for SV-wave with the absence of external force. This work aims to investigate the influence of external force in the propagation of SV-wave in the soluble and insoluble Mediums. Isotropic wave model is derived for SV-wave with various forces in accordance to Duhamel Principle and their analytical solutions are used to compare with each other’s’ amplitudes. With the existence of high density fluid, diffusive waves with larger external force will induce higher amplitude. However, SV-waves are non-diffusive in low density Medium and hence, this work concludes that wave diffusion by external force is subjected to the properties of the targeted Medium
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Pseudo wave by propagation of SH-wave with sinusoidal force in Saturated Medium
2014Co-Authors: Teng Lie Siang, Zainal Abdul Aziz, Dennis Ling Chuan ChingAbstract:Analytical solutions for the propagation of SH-wave with the existing sinusoidal force or pseudo wave in miscible and immiscible Mediums are found. Comparison is done for the propagating SH-wave with and without sinusoidal force. Identical waves are found in both the Mediums. Studies are extended to wave attenuation where sinusoidal force tends to amplify SH-wave and increase the diffusion.
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Displacement by SV Waves in Fluid Saturated Medium
2010 Second International Conference on Computer Research and Development, 2010Co-Authors: Dennis Ling Chuan Ching, Zainal Abdul AzizAbstract:This paper aims to study the diffusion of SV-waves when the Medium is fluid Saturated. SV-waves are propagated in the Medium designed for studying the diffusive attribute. The Mediums are chosen to fall into two distinctive groups: insoluble as well as soluble Mediums. Refraction which is related to the wave's slowness is introduced in view of the fact that the fluid is classified into high density and also low density. Consequently, the simulated results have shown that the high density fluid revokes the diffusive characteristics of the SVwave. Moreover these non diffusive SV-waves are found in the Medium Saturated with low density fluid.
C. C. Dennis Ling - One of the best experts on this subject based on the ideXlab platform.
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P-SV wave diffusion in fluid-Saturated Medium
Malaysian Journal of Fundamental and Applied Sciences, 2014Co-Authors: C. C. Dennis Ling, A. A. ZainalAbstract:Propagating P-SV waves in the fluid-Saturated Mediums are categorized to fall into two distinct groups: insoluble and soluble Mediums. These waves are known as surface Rayleigh waves. By introducing these waves with slowness in accordance to Snell Law, the diffusive and rotating waves are obtained. The results bear out that the propagating P-SV waves in soluble Medium share similar diffusion characteristic as of insoluble Medium while the discussions on fluid density in the Mediums show that high density fluid promotes diffusive characteristic while low density fluid endorses nondiffusive P-SV waves. There is a compressed zone during the propagation of P-SV waves in Medium Saturated with high density fluids.
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Scattering of SH Waves in Fluid Saturated Medium
Applied mathematical sciences, 2010Co-Authors: A. A. Zainal, C. C. Dennis Ling, S. Y. FaisalAbstract:The deviation in SH-waves’ velocities is expected once the saturation degree in the Medium is asymmetrical. Hence, SH-waves’ propagation in the porous Medium Saturated with asymmetry ∞uid density is studied for the difiusive proflles. SH-waves are propagated in similar directions and also opposite directions with the Mediums fall into two distinctive groups: insoluble as well as soluble Mediums. In similar direction of propagation, low density ∞uid revokes the difiusive characteristics while high density ∞uid promotes difiusive attribute. However, the difiusive SH-waves are as well found in the Medium Saturated with low density ∞uid when the ∞uid is asymmetrical in density. In the case of opposite direction of propagation, the recurring SH-waves are found in the Medium Saturated with low and asymmetry density ∞uid. Mathematics Subject Classiflcation: 86A15, 74J30, 86A17
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SH Waves Diffusion in Fluid-Saturated Medium
Journal of Mathematics and Statistics, 2010Co-Authors: C. C. Dennis Ling, S. Y. Faisal, A. A. ZainalAbstract:Problem statement: Characteristics of the seismic waves have been studied mainly the amplitudes, attenuation, frequency, porosity and the velocity of the waves. In this study, the SH-waves were studied for the diffusion which was related to the diffraction of SH-waves in the Saturated Medium. Approach: The elastic wave equation was being used to show the SH-waves. A comparison was made of the propagating SH-waves in the fluid-Saturated Mediums that were categorized into two distinct groups: Insoluble and soluble Mediums. Results: The discussions on fluid density in the Mediums showed that high density fluid promotes diffusive characteristic while low density fluid endorses non diffusive SH-wave. However, the diffraction had induced significant shock wave in the Medium Saturated with low density fluid. Conclusion: These results indicated that the linear seismic waves are able to transform into nonlinear waves.
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P-wave diffusion in fluid-Saturated Medium
Mathematika, 2010Co-Authors: C. C. Dennis Ling, S. Y. Faisal, A. A. ZainalAbstract:This paper considers the propagating P-waves in the fluid-Saturated medi- ums that are categorized to fall into two distinct groups: insoluble and soluble medi- ums. P-waves are introduced with slowness in accordance to Snell Law and are shown to relate to the Medium displacement and wave diffusion. Consequently, the results bear out that the propagating P-waves in the soluble Medium share similar diffusive characteristic as of insoluble Medium. Nonetheless, our study on fluid density in the Mediums show that high density fluid promotes diffusive characteristic whiles low den- sity fluid endorses non-diffusive P-wave.
Eduard Rohan - One of the best experts on this subject based on the ideXlab platform.
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multiscale modeling of a fluid Saturated Medium with double porosity relevance to the compact bone
Journal of The Mechanics and Physics of Solids, 2012Co-Authors: Eduard Rohan, Salah Naili, Robert Cimrman, T LemaireAbstract:Abstract In this paper, we develop a model of a homogenized fluid-Saturated deformable porous Medium. To account for the double porosity the Biot model is considered at the mesoscale with a scale-dependent permeability in compartments representing the second-level porosity. This model is treated by the homogenization procedure based on the asymptotic analysis of periodic “microstructure”. When passing to the limit, auxiliary microscopic problems are introduced, which provide the corrector basis functions that are needed to compute the effective material parameters. The macroscopic problem describes the deformation-induced Darcy flow in the primary porosities whereas the microflow in the double porosity is responsible for the fading memory effects via the macroscopic poro-visco-elastic constitutive law. For the homogenization procedure, we use the periodic unfolding method. We discuss also the stress and flow recovery at multiple scales characterizing the heterogeneous material. The model is proposed as a theoretical basis to describe compact bone behavior on multiple scales.
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On the homogenization of a diffusion–deformation problem in strongly heterogeneous media
Ricerche di Matematica, 2007Co-Authors: Georges Griso, Eduard RohanAbstract:We consider a porous fluid-Saturated Medium with periodic distribution of heterogeneities where the value of permeability decreases with the scale parameters. Homogenization of such double-porous material is performed using the method of periodic unfolding. The resulting homogenized macroscopic model is featured by the fading memory effect in the viscoelastic behaviour.
Damien Jougnot - One of the best experts on this subject based on the ideXlab platform.
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Impact of water saturation on seismoelectric transfer functions: a laboratory study of coseismic phenomenon
Geophysical Journal International, 2015Co-Authors: Clarisse Bordes, P Sénéchal, Julien Barrìère, Daniel Brito, Eric Normandin, Damien JougnotAbstract:S U M M A R Y Seismic waves propagating in a porous Medium, under favourable conditions, generate measurable electromagnetic fields due to electrokinetic effects. It has been proposed, following experimental and numerical studies, that these so-called 'seismoelectromagnetic' couplings depend on pore fluid properties. The theoretical frame describing these phenomena are based on the original Biot's theory, assuming that pores are fluid-filled. We study here the impact of a partially Saturated Medium on amplitudes of those seismoelectric couplings by comparing experimental data to an effective fluid model. We have built a 1-m-length-scale experiment designed for imbibition and drainage of an homogeneous silica sand; the experimental setup includes a seismic source, accelerometers, electric dipoles and capacitance probes in order to monitor seismic and seismoelectric fields during water saturation. Apparent velocities and frequency spectra (in the kiloHertz range) are derived from seismic and electrical measurements during experiments in varying saturation conditions. Amplitudes of seismic and seismoelectric waves and their ratios (i.e. transfer functions) are discussed using a spectral analysis performed by continuous wavelet transform. The experiments reveal that amplitude ratios of seismic to coseismic electric signals remain rather constant as a function of the water saturation in the S w = [0.2–0.9] range, consistently with theoretically predicted transfer functions.
