• Elliptic surfaces over a genus 1 curve with the pair (l3, l9) of singular fibers. 

      Al Rhayyel, Ahmad [احمد عبد الله الرحيل] ( Qatar University , 2000 , Article)
      In this paper we give a classication of all minimal elliptic surfaces (n : E —> C, g(c) = 1) with a section and exactly the pair (L, L)) of singular fibers.
    • Explicit Forms of Conservation Laws of a Class of Differential Equations 

      El Sherbiny, H. M. [حامد مصطفى الشربيني] ( Qatar University , 1994 , Article)
      Explicit forms of conservation laws of a class of nonlinear partial differential equations are derived; firstly from BScklund transformation and secondly from the. fundamental equations of the corresponding inverse method.
    • An Extension of the Szasz-Mirakyan Operator on the Whole Real Axis 

      Lehua, Mu [مو ليهوا] ( Qatar University , 2000 , Article)
      The aim of this paper is to present a new extension of the Szasz-Mirakyan operator n the whole real axis, and to give its convergent approximation theorem.
    • A Family Of Nonramified Functions, Defined In Zz<1 

      Gabr, M. K [محمد كامل جبر] ( Qatar University , 1983 , Article)
      In this article a family of nonramified functtions, defined in zz<l, is obtained. It is characterized by an achieved distortion theorem; its Bloch constant and the limit of convexity are determined. Peschl's principle is. ...
    • Filtered Dehomogenization Theory For The Micro-structure sheves OY 

      Radwan, Abd El-Aziz E. [عبد العزيز رضوان] ( Qatar University , 1999 , Article)
      In this work we study the theory of dehomogenization at the level of filtered sheaves using the micro-structure sheaves. For the sheaf of quantum section the results are still true.
    • Fixed Point Theorems in Topological Spaces 

      Naidu, S. V. R. [نايدو س . ف . ر.] ( Qatar University , 2000 , Article)
      A couple of theorems for a pair of self-maps on a topological space have been obtained using which certain fixed point theorems in the literature for pairs of maps satisfying contractive type conditions have been deduced. In ...
    • Functions Near Of Na-Continuity 

      Mahmoud, R. A. [رمصان عبد العاطي محمود]; Nasef, A. A.; El-Monsef, M. E. Abd ( Qatar University , 1989 , Article)
      In 1986, the concept of Na-continuity was initiated by Chae et al., this leads us to introduce two classes of functions, namely strongly Na-continuity and weakly Na-continuity. We characterize these new types. Several ...
    • Generalized Airy's- and taylor Integral Functions 

      Gabr, M. K [محمد كامل جبر]; Shalem, Sh. ( Qatar University , 1982 , Article)
      In this paper a generalized form of Airy's function has been estimated and an asymptotic expansion for one of its types is obtained. Furthermore, an improved formula could be induced to acquire the asymptotic expansion of ...
    • Generation of Sets of Sequences lsomorphic to Walsh Sequences 

      Al Cheikha, Ahmad [احمد حمزة الشيخة] ( Qatar University , 2005 , Article)
      Walsh sequences of the order 2k, k positive integer, form an additive group generated by Rademacher sequences set of ft-order. Except the zero sequence, Walsh sequences form an orthogonal set. Our present work allows us ...
    • Gravitational Instability of a Radiating Gas Cloud with Variable streams 

      Radwan, Ahmed E. [احمد العزب رضوان] ( Qatar University , 2001 , Article)
      The self-gravitating instability of a radiating gas cloud possessing variable streams is investigated. The self-gravitating force is destabilizing according to restrictions, the radiation has a strong stabilizing influence ...
    • Gravitohydrodynamic Instability Of A Streaming Fluid Cylinder 

      Radwan, Ahmed E. [احمد العزب رضوان] ( Qatar University , 1996 , Article)
      The capillary-gravitodynamic instability of a self-gravitating fluid cylinder (radius R«) dispersed in a self-gravitating medium of negligible motion has been developed. General stability criteria are derived, upon utilizing ...
    • Homomorphisms And Subalgebras Of Ms-Algebras 

      El-Assar, S.; Badawy, A. ( Qatar University , 1995 , Article)
      According to the characterization of MS-algcbras from the subvaricty Kj by mean of the triple construction, we characterize the homomorphisms and the subalgebras of the MS-algcbras. Also, we solve the "Fill-in" problem for ...
    • Improvement Of The Piecewise Approximation Methods 

      Rababah, A. [ا . ربايه] ( Qatar University , 1996 , Article)
      A piecewise approximation method is described for planar curves. The order of classical piecewise approximations is improved. The method exploits the freedom in the choice of the parametrization and rises the approximation ...
    • Inclusion Relation between Two Absolute Summability Methods 

      Al Madi, Azmi. K. [عزمي الماضي] ( Qatar University , 1999 , Article)
      In the present paper, the problem of inclusion of the absolute method of summability \N,q with that of \N,r has been considered. Nesessary and suffiecient condition for which \N,q I C_ N,r I is established, and non-trivial ...
    • Indecomposable Representations Of Order Of E6 

      Omar, A. A. H [عبد الرؤوف عمر]; Sidky, F. I. ( Qatar University , 1985 , Article)
      The extended Dynkin diagram is a valued graph. We are going to construct a Baechstrom order A associateed to Eg. We prove, by constructions, that the order A of infinite lattice-type but can be listed (tame-type), i.e., ...
    • Investigation Of Single-Update Memoryless Cg-Methods 

      Al Bayati, A. Y. [عباس البياتي]; Ahmed, Huda Issam ( Qatar University , 1996 , Article)
      Two new CG-methods are proposed in this work for nonlinear unconstrained optimization problems which are considered as memoryless Variable Metric (VM) methods. They are derived for the inexact line searches and evaluated ...
    • Krein's Method For Singular Mixed Problems 

      Abdou, M. A.; Ezzeldin, Naglaa Y.; عبده, محمد; عز الدين, نجلاء ( Qatar University , 1993 , Article)
      In this paper, the spectral relations of the Fredholm integral equation of the first kind for the mixed problems with singular kernel are obtained.
    • Krein's method for solving the integral equation of the first kind With logarithmic kernel 

      Abdou, M. A.; El Rahman, R. O. Abd; عبده, محمد عبد الله احمد; عبد الرحمن, ر. و. ( 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 

      Kittani< Hilmi F. [حلمي كتانة] ( 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 

      Smadi, Abdullah A. [عبد الله الصمادي] ( 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 ...