نتایج جستجو برای: laplace transform

تعداد نتایج: 122903  

Although Elzaki transform is stronger than Sumudu and Laplace transforms to solve the ordinary differential equations withnon-constant coefficients, but this method does not lead to finding the answer of some differential equations. In this paper, a method is introduced to find that a differential equation by Elzaki transform can be ‎solved?‎

1986
G Ramm

Let J% exp(-PQf(t) dt = F(P) P > 0 where b > 0 is a given number. We give a formula for f (t) in terms of F (p) , p > 0. The object of this Letter is to give a formula for the inverse Laplace transform in which the data used are given on the semi-axis p > 0 only. Let P>O where b > 0 is a fixed number. We have (1, formula 4.14.1) where Jo is a Bessel function. It follows from (1) and (2) that s,...

1996
N. De Grande A.Yu. Khrennikov

Topological properties of the spaces of analytic test functions and distributions are investigated in the framework of the general theory of nonarchimedean locally convex spaces. The Laplace transform, topological isomorphism, is introduced and applied to the differential equations of nonarchimedean mathematical physics (Klein-Gordon and Dirac propagators).

2014
Long Shi Zuguo Yu Zhi Mao Aiguo Xiao

In continuum one-dimensional space, a coupled directed continuous time random walk model is proposed, where the random walker jumps toward one direction and the waiting time between jumps affects the subsequent jump. In the proposed model, the Laplace-Laplace transform of the probability density function P(x, t) of finding the walker at position x at time t is completely determined by the Lapla...

Journal: :international journal of civil engineering 0
i. ashayeri civil engineering department, school of engineering, razi university, taghebostan, daneshgah blvd., kermanshah, iran, p.o.box: 67149-67346 m. kamalian geotechnical research center, international institute of earthquake engineering & seismology (iiees), no. 26 arghavan st., north dibaji st. tehran, iran, p.o.box: 19537-14453 m. k jafari geotechnical research center, international institute of earthquake engineering & seismology (iiees), no. 26 arghavan st., north dibaji st. tehran, iran, p.o.box: 19537-14453 m. biglari civil engineering department, school of engineering, razi university, taghebostan, daneshgah blvd., kermanshah, iran, p.o.box: 67149-67346 ma. mirmohammad sadeghi isfahan higher education and research institute (iheari), p.o. box: 18314-416 isfahan, iran

this paper presents time domain fundamental solutions for the extended biot's dynamic formulations of two-dimensional (2d) unsaturated poroelasticity. unsaturated porous media is considered as a porous media in which the voids are saturated with two immiscible fluids, i.e. liquid and gas. at first, the corresponding explicit laplace transform domain fundamental solution is obtained in term...

2016
Chris R. Ahrendt Chris Ahrendt Allan Peterson

In this dissertation, we first focus on the generalized Laplace transform on time scales. We prove several properties of the generalized exponential function which will allow us to explore some of the fundamental properties of the Laplace transform. We then give a description of the region in the complex plane for which the improper integral in the definition of the Laplace transform converges,...

2004
Shaoqiang Tang Huijiang Zhao Philippe leFloch H. ZHAO

We study stability of subsonic phase boundary solutions in the Suliciu model for phase transitions under tri-linear structural relation. With the help of Laplace transform, the evolution of perturbation is described by a linear dynamical system, and explicit solution is obtained in terms of inverse Laplace transform. Stability is established through energy estimates. The relaxed system is also ...

2000
BORIS BÄUMER

The Laplace transform theory of Banach space valued functions and the field of evolution equations presently offer many research problems which are of general interest in mathematical analysis. Although there is a longstanding relationship between the two fields, it was not until recently that the basic transform principles for Banach space valued functions could be formulated in a satisfactory...

2004
John H. Schwarz

The generalized Stieltjes transform (GST) is an integral transform that depends on a parameter ρ > 0. In previous work a convenient form of the inverse transformation was derived for the case ρ = 3/2. This paper generalizes that result to all ρ > 0. It is a well-known fact that the GST can be formulated as an iterated Laplace transform, and that therefore its inverse can be expressed as an iter...

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