Browsing by Subject "Mathematics"
Now showing items 41-60 of 110
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Krein's method for solving the integral equation of the first kind With logarithmic kernel
( Qatar University , 1993 , Article)Consider the Fredholm's integral equation of the first kind with logarithmic kernel K(IXI) = (- In Ixl. The aim of this paper is to establish the equivalence of Krein's method of solving the equation with the following ... -
The Likelihood Function For A Progressive Disease Model With A Bivariate Survival Function
( Qatar University , 1995 , Article)A model for the natural history of a progressive disease is developed. The model has three disease states and can be expressed as the joint distribution of two survival random variables. Covariate information is incorporated ... -
Lumping Processes of Periodic ARMA Processes
( Qatar University , 2004 , Article)In this article various lumping processes are defined for periodic ARMA (PARMA) processes, namely, the forward, the backward and the cyclic lumping processes. The inter-relations between the parameters of these lumping ... -
The magical influence of statistical significance
( Qatar University , 2004 , Article)This paper examined 1122 statistical tests found in 55 master theses accredited during 1995-2000 at Mu'tah University. It tried to answer two main questions: First, do researchers still relying on the level of significance ... -
A Markov Chain Model For River Flow
( Qatar University , 1996 , Article)This paper is concerned with a trinary transformation of river flow. The transformed flow is modeled as a three-states Markov chain and both upcrossing and downcrossing problems are studied simultaneously. The stationary ... -
A Mathematical Model Of The Dynamics Of Schistosomiasis
( Qatar University , 1996 , Article)In this work the authors develop a mathematical model for the dynamics of a major helminth parasite of man, schistosomiasis. The model is a system of coupled non-linear equations. Numerical experimentations with the model ... -
A Mixed Markovian Time Series Model
( Qatar University , 1997 , Article)We study a simple time series model the noise properties of the proposed model are derived. An algorithm based on the conditional mean and the conditional variance, for estimating the parameters of the proposed model is ... -
Morphisms Of Affine Schemes And Equivalence Of Categories
( Qatar University , 1996 , Article)In this work we construct the relation between the category R-filt (G(R)-gr) and the category O^ — Filt(O^ — Gr). The quantum (ungraded) version of this result can be obtained by restricting to parts of zero degree. ... -
New switching algorithm for combining new multi-step CG and self-scaling VM algorithms for non-linear optimization
( Qatar University , 1997 , Article)New interleaved CG and self-scaling VM algorithm is presented in this research which combines Al Bayati's self-scaling VM algorithm with another new multi-step CG algorithm with inexact line searches (ILS). In an interleaving ... -
A Note on Norland Summability of Fourier Series
( Qatar University , 1982 , Article)In this paper we consider point-wise summability in the Norlund sense of Fourier series by assuming H(n) . F(n) = o (Pn) as n--+ oo, where (H(x) = d.x g(t) dt, g(t) is continuous, non-increasing, H(x) is slowly varying, ... -
A Note On Pre-J-Group Rings
( Qatar University , 1991 , Article)Given an associative ring R satisfying a°'b = Ba" for any pair a and b of its elements, is being a positive integer, and a group G satisfying x""' = y"~1, we give a sufficient and necessary condition on the group ring GR ... -
A Note On Semi Generalized Closed Sets
( Qatar University , 1994 , Article)In the present note authors obtain some characterizations and properties of semi generalized closed sets. -
A Numerical Solution For The Bending Of A Plate Using The Boundary Element Method
( Qatar University , 1992 , Article)In this paper the numercial solution for the bending of a plate is considered. The method used is called the Boundary Element Method (BEM). The BEM is a numerical method based on the boundary integral equation formulation ... -
On 2n+L-Vertex-Free Graphs
( Qatar University , 1983 , Article)We shall introduce the concepts of pseudoadjacent, pseudocoatraction and pseudoho-momorphism. We shall show, with the help of these concepts, in theorem 2 that every quadrilateral graph V (which is a 4-vertexgraph) has ... -
On A Kp Class Of Partial Differential Equations Conservation Laws And Solitary Wave Solutions
( Qatar University , 1996 , Article)It is shown that a KP class of partial differential equations possesses an infinite number of conservation laws. In addition, exact and explicit solitary wave solutions are constructed for the KP class of equations, which ... -
On a mixed boundary value problem for elliptic equations
( Qatar University , 1988 , Article)In this work, a general form of linear and quasilinear elliptic equations is considered. In the presence of boundary singularities, some estimations for the error, according to the net method, are obtained. -
On A Relation Between Two Absolute Summability Methods
( Qatar University , 1997 , Article)In this paper we prove a theorem concerning a relation between the summability methods |R,pn,qnlJt and |R,un|fc , k > 1 , which generalizes a result of Bor [2]. -
On an inverse scattering problem with a discontinuous coefficient On the whole line
( Qatar University , 1994 , Article)This paper is devoted to study the inverse scattering problem of a generalized Sturm-Liouville equation on the whole line.The solutions of the considered problem and their asymptotic behaviour are presented.The expansion ... -
On Dirichlet Problem With Singular Integral Boundary Condition
( Qatar University , 1983 , Article)In this paper a Dirichlet problem, with singular integral condition, is studied. It is shown that such problem can be reduced to a regular equation which allows us to construct the solution. -
On estimates of the rate of convergence In the global limit theorems for Homogeneous markov chains
( Qatar University , 1997 , Article)In this paper some estimates are obtained for the remainder term in the limit theorems for the weighted sum of random variables forming a homogeneous Markov chain with arbitrary set of possible states . The achieved results ...
