نتایج جستجو برای: diffusion to thermal wave propagation

تعداد نتایج: 10844535  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز 1355

وقتی دو گاز مختلف که از نظر شیمیائی بر یکدیگر بی اثر بوده و در یک سیستمی که درجه حرارت و فشار آن ثابت باشد در یکدیگر نفوذ کنند 7 این نفوذ سبب اختلاف درجه حرارت شده . اصطلاحا" این پدیده را اثر گرمائی نفوذ (diffusion thermoeffect) می گویند. دوفر (dufour) در سال 1972 برای اولین بار به این پدیده پی برد و چندی نگذشت که کلاسیوس و والدمن این پدیده را بطور مستقل کشف کردند. این پدیده از آن جهت حائز اهمی...

2008
S. K. ROYCHOUDHURI

A study is made of the propagation of time-harmonic plane waves in an infinite, conducting, thermoelastic solid permeated by a uniform primary external magnetic field when the entire medium is rotating with a uniform angular velocity. The thermoelasticity theory of type II (G-N model) (1993) is used to study the propagation of waves. A more general dispersion equation is derived to determine th...

Journal: :Mathematical biosciences 2005
S Brown J Dockery M Pernarowski

Presented is a reaction-diffusion model for the interaction of pioneer and climax species. For certain parameters the system exhibits bistability and traveling wave solutions. Specifically, we show that when the climax species diffuses at a slow rate there are traveling wave solutions which correspond to extinction waves of either the pioneer or climax species. A leading order analysis is used ...

Journal: :PLoS ONE 2009
Elena A. Ermakova Emmanuil E. Shnol Mikhail A. Panteleev Andrey A. Butylin Vitaly Volpert Fazoil I. Ataullakhanov

BACKGROUND Existence of flows and convection is an essential and integral feature of many excitable media with wave propagation modes, such as blood coagulation or bioreactors. METHODS/RESULTS Here, propagation of two-dimensional waves is studied in parabolic channel flow of excitable medium of the FitzHugh-Nagumo type. Even if the stream velocity is hundreds of times higher that the wave vel...

2012
Fatimah A. Alshaikh

The purpose of this research is to study the reflection transverse waves in the GreenLindsay theory for kind of smart materials under initial stress and relaxation times effect. It is found that, for two dimensional model of thermo-piezoelectric material, there exists four waves namely, quasi-transverse wave (QS-mode), quasi-longitudinal wave (QP-mode), thermal wave ( -mode), and potential elec...

Morteza Eskandari Ghadi Navid Shad Manaman

The existing theory for wave propagation through a soil layer are not compatible with the real soil layers because in the theory the layers are flat and the sub-layers are parallel, while in real the soil layers are not flat and they may not be parallel. Thus, wave propagations through a corrugated interface are so important. In this paper, a two-dimensional SH-wave propagation through a corrug...

Journal: :Journal of the Royal Society, Interface 2013
Marek Kochanczyk Joanna Jaruszewicz Tomasz Lipniacki

Transitions between steady states of a multi-stable stochastic system in the perfectly mixed chemical reactor are possible only because of stochastic switching. In realistic cellular conditions, where diffusion is limited, transitions between steady states can also follow from the propagation of travelling waves. Here, we study the interplay between the two modes of transition for a prototype b...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

a one dimensional dynamic model for a riser reactor in a fluidized bed catalytic cracking unit (fccu) for gasoil feed has been developed in two distinct conditions, one for industrial fccu and another for fccu using various frequencies of microwave energy spaced at the height of the riser reactor (fccu-mw). in addition, in order to increase the accuracy of component and bulk diffusion, instanta...

A frequency-wavenumber-domain formulation is presented in this paper for calculation of the Green's functions and wave propagation modes in a stratified fluid body underlain by a layered viscoelastic soil medium. The Green's functions define the solid and fluid displacements and fluid pressures due to uniform disk loads acting in either the soil or fluid media. The solution is in the frequency ...

Rajneesh Kakar

An approximation technique is considered for computing transmission and reflection coefficients for plane waves propagating through stratified slabs. The propagation of elastic pulse through a planar slab is derived from first principles using straightforward time-dependent method. The paper ends with calculations of enhancement factor for the elastic plane wave and it is shown that it depends ...

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