Results 241 to 250 of about 882,435 (290)

Generalized Approach to Heterogeneous Media

Transport in Porous Media, 1995
This paper is devoted to the description of a generalized approach developed for over-coming the fundamental difficulties that occur when the phenomenological field theory is extended from homogeneous to heterogeneous media. The origin of these difficulties lies in the kinematics of heterogeneous media where different constituents have in general ...
P. Jouanna, M.-A. Abellan
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Diffusion in Heterogeneous Media

Journal of Heat Transfer, 1982
Heat or mass diffusion problems of finite heterogeneous media are characterized by a set of partial differential equations for temperatures or mass concentrations, Tk (x, t), (k = 1, 2, . . . , n), in every point in space, which are coupled through source-sink terms in the equations.
M. D. Mikhailov, M. N. O¨¸zisik, B. K. Shishedjiev   +2 more
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Heterogeneous recording media

SPIE Proceedings, 1991
The paper summarizes the results of investigations performed to obtain deep 3-D holograms with 102 i0 mkm physical thickness allowing the postexposure amplification and the a posteriori changing of the grating parameters. This aim has been achieved by developing heterogeneous systems on the basis of porous glass with light-sensitive compositions ...
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HETEROGENEOUS PACEMAKERS IN OSCILLATORY MEDIA

2004
We discuss analytical and numerical results related to target patterns produced by heterogeneous pacemakers in oscillatory reaction-diffusion systems. The model consists of a complex Ginzburg-Landau equation where the oscillation frequency is space-dependent. Analytical calculations are performed in the framework of the phase dynamics approximation. We
Stich, M., Mikhailov, A.
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RAFT mediated polymerisation in heterogeneous media

Soft Matter, 2006
Reversible addition fragmentation chain transfer (RAFT) mediated polymerisation is one of a number of living radical polymerisation processes that were developed over the last decade. The RAFT process is facilitating the synthesis of controlled macromolecular architectures radical polymerisation in homogeneous and heterogeneous media.
McLeary JB, Klumperman B
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THERMOMECHANICS OF HETEROGENEOUS MEDIA

Journal of Thermal Stresses, 1997
This is a brief survey of some recently developed micromechanical modeling methods and certain results concerning the overall thermomechanical response and average local fields in both elastic and inelastic composite materials with extensions to laminated plates.
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Acoustic source localization in heterogeneous media

Ultrasonics, 2019
Acoustic source localization (ASL) or predicting the location of the acoustic source in a structure by analyzing the recorded signals at the receivers is of considerable interest for various applications. Recent research advances on this topic have been limited to homogeneous media.
Shenxin, Yin, Zhiwen, Cui, Jia, Fu, Tribikram, Kundu   +3 more
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Ultrasound Emitter Localization in Heterogeneous Media

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2007
A novel algorithm to accurately determine the location of an ultrasound source within heterogeneous media is presented. The method obtains a small spacial error of 748 microm+/-310 microm for 100 different measurements inside a circular area with 140 mm diameter. The new algorithm can be used in targeted drug delivery for cancer therapies as well as to
Michael, Flückiger, Bradley J, Nelson
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Inversion in Heterogeneous Media

2001
In Chapter 3, we created our first inversion formulas for the three-dimensional inverse-scattering imaging problem. We formulated the problem for the special case of data collected with a zero-offset recording geometry, and assumed a constant-background wavespeed.
N. Bleistein, J. W. Stockwell, J. K. Cohen   +2 more
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Turing pattern formation in heterogenous media

Physica D: Nonlinear Phenomena, 1996
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Voroney, J.-P., Lawniczak, A. T., Kapral, R.   +2 more
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