Volume 31 (2020)
Volume 30 (2019)
Volume 29 (2018)
Volume 28 (2017)
Volume 27 (2016)
Volume 26 (2015)
Volume 25 (2014)
Volume 24 (2013)
Volume 23 (2012)
Volume 22 (2011)
Volume 21 (2010)
Volume 20 (2009)
Volume 19 (2008)
Volume 17 (2006)
Volume 16 (2005)
Volume 15 (2004)
Volume 14 (2003)
Volume 13 (2002)
Volume 12 (2001)
Volume 11 (2000)
Volume 10 (1999)
Volume 9 (1998)
Volume 8 (1997)
Volume 7 (1996)
Volume 6 (1995)
Volume 5 (1994)
Volume 4 (1993)
Volume 3 (1992)
Volume 2 (1991)
Volume 1 (1990)
Volume 1 (1989)
1. Synthesis of Binary Ti-Si Mixed Oxides Nanoparticles with Rutile Structure as Selective Catalyst for Epoxidation of Alkenes

F. Farzaneh

Volume 18, Issue 4 , Autumn 2007, Pages 303-395

  The nanoparticles of Ti-Si mixed oxides (NTSO) with Rutile structure were prepared by sol-gel method in a mixture of alcohol and water as solvent. The solid product was characterized by XRD, FTIR, SEM, TEM, UV, TGA and laser Raman spectroscopy. The catalytic activity of NTSO (5-10 nm) was investigated ...  Read More

2. Complete Convergence and Some Maximal Inequalities for Weighted Sums of Random Variables

M. Amini

Volume 18, Issue 4 , Autumn 2007, Pages 311-316

  Let  be a sequence of arbitrary random variables with  and , for every  and  be an array of real numbers. We will obtain two maximal inequalities for partial sums and weighted sums of random variables and also, we will prove complete convergence for weighted sums , under some conditions ...  Read More

3. A Computational Meshless Method for Solving Multivariable Integral Equations

E. Babolian

Volume 18, Issue 4 , Autumn 2007, Pages 317-321

  In this paper we use radial basis functions to solve multivariable integral equations. We use collocation method for implementation. Numerical experiments show the accuracy of the method.  Read More

4. On the U-WPF Acts over Monoids

A. Golchin

Volume 18, Issue 4 , Autumn 2007, Pages 323-328

  Valdis Laan in [5] introduced an extension of strong flatness which is called weak pullback flatness. In this paper we introduce a new property of acts over monoids, called U-WPF which is an extension of weak pullback flatness and give a classification of monoids by this property of their acts and also ...  Read More

5. Nonlinear Two-Phase Stefan Problem

K. Ivaz

Volume 18, Issue 4 , Autumn 2007, Pages 329-337

  In this paper we consider a nonlinear two-phase Stefan problem in one-dimensional space. The problem is mapped into a nonlinear Volterra integral equation for the free boundary.  Read More

6. Derivations on Certain Semigroup Algebras

M. Lashkarizadeh Bami

Volume 18, Issue 4 , Autumn 2007, Pages 339-345

  In the present paper we give a partially negative answer to a conjecture of Ghahramani, Runde and Willis. We also discuss the derivation problem for both foundation semigroup algebras and Clifford semigroup algebras. In particular, we prove that if S is a topological Clifford semigroup for which Es is ...  Read More

7. Modified Progressive Type-II Censoring Procedure in Life-Testing under the Weibull Model

M. Khodadadi

Volume 18, Issue 4 , Autumn 2007, Pages 347-354

  In this paper we introduce a new scheme of censoring and study it under the Weibull distribution. This scheme is a mixture of progressive Type II censoring and self relocating design which was first introduced by Srivastava [8]. We show the superiority of this censoring scheme (PSRD) relative to the ...  Read More

8. Essentially Retractable Modules

M.R. Vedadi

Volume 18, Issue 4 , Autumn 2007, Pages 355-360

  We call a module  essentially retractable if HomR for all essential submodules N of M. For a right FBN ring R, it is shown that: (i)  A non-zero module  is retractable (in the sense that HomR for all non-zero ) if and only if certain factor modules of M are essentially retractable ...  Read More