Mathematics, Statistics & Physics: Recent submissions
Now showing items 701-720 of 738
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On the numerical simulation of population dynamics with density-dependent migrations and the Allee effects
( IOP Publishing , 2008 , Article)In this paper, the variational iteration method (VIM) and the Adomian decomposition method (ADM) are presented for the numerical simulation of the population dynamics model with density-dependent migrations and the Allee ... -
Numerical bifurcation of predator-prey fractional differential equations with a constant rate harvesting
( IOP Publishing , 2008 , Article)In this article saddle and Hopf bifurcation points of predator-prey fractional differential equations system with a constant rate harvesting are investigated. The numerical results based on Grunwald-Letnikov discretization ... -
Analytical approach to the Darcy–Lapwood–Brinkman equation
( Elsevier , 2007 , Article)Three exact solutions are obtained for flow through porous media, as governed by the Darcy–Lapwood–Brinkman model, for a given vorticity distribution. The resulting flow fields are identified as reversing flows; stagnation ... -
Estimation of Pr(X ≤ Y) using record values in the one and two parameter exponential distributions
( Taylor & Francis , 2008 , Article)Abstract We consider the problem of estimating the stress-strength reliability when the available data is in the form of record values. The one parameter and two parameters exponential distribution are considered. In the ... -
Likelihood and Bayesian estimation of using lower record values from the generalized exponential distribution
( Elsevier Ltd , 2007 , Article)We consider the likelihood and Bayesian estimation of the stress-strength reliability based on lower record values from the generalized exponential distribution. The estimators are derived and their properties are studied. ... -
Preparation, spectroscopic and structural studies on charge-transfer complexes of 2,9-dimethyl-1,10-phenanthroline with some electron acceptors
( Elsevier , 2007 , Article)Charge-transfer (CT) complexes formed in the reactions of 2,9-dimethyl-1,10-phenanthroline (Me2phen) with some acceptors such as chloranil (Chl), picric acid (HPA) and chloranilic acid (H2CA) have been studied in the defined ... -
Analysis of particulate behavior in porous media
( Shanghai University Press , 2008 , Article)In this work, we analyze the behavior of the particle phase in the flow of a particle-laden mixture through a porous medium. An attempt is made to model the diffusion and dispersion processes, and to quantify the deviation ... -
Solving systems of fractional differential equations using differential transform method
( Elsevier B.V. , 2007 , Article)This paper presents approximate analytical solutions for systems of fractional differential equations using the differential transform method. The fractional derivatives are described in the Caputo sense. The application ... -
Convergence theorems for nonself asymptotically nonexpansive mappings
( Elsevier B.V. , 2007 , Article)In this paper, we prove some strong and weak convergence theorems using a modified iterative process for nonself asymptotically nonexpansive mappings in a uniformly convex Banach space. This will improve and generalize the ... -
On the estimation of reliabilty function in a Weibull lifetime distribution
( Taylor & Francis , 2008 , Article)The estimation of the reliability function of the Weibull lifetime model is considered in the presence of uncertain prior information (not in the form of prior distribution) on the parameter of interest. This information ... -
On the 'independence of trials-assumption' in geometric distribution
( Taylor & Francis, Ltd , 2008 , Article)In this note, it is shown through an example that the assumption of the independence of Bernoulli trials in the geometric experiment may unexpectedly not be satisfied. The example can serve as a suitable and useful classroom ... -
One and two sample confidence intervals for estimating the mean of skewed populations: an empirical comparative study
( TAYLOR & FRANCIS LTD , 2009 , Article)In this paper we consider and propose some confidence intervals for estimating the mean or difference of means of skewed populations. We extend the median t interval to the two sample problem. Further, we suggest using the ... -
The modified homotopy perturbation method for solving strongly nonlinear oscillators
( Elsevier , 2009 , Article)In this paper we propose a reliable algorithm for the solution of nonlinear oscillators. Our algorithm is based upon the homotopy perturbation method (HPM), Laplace transforms, and Padé approximants. This modified homotopy ... -
A simulated annealing technique for multi-objective simulation optimization
( Elsevier , 2009 , Article)In this paper, we present a simulated annealing algorithm for solving multi-objective simulation optimization problems. The algorithm is based on the idea of simulated annealing with constant temperature, and uses a rule ... -
New tellurite glass: Optical properties
( Elsevier , 2008 , Article)The refractive index and UV spectra of the quaternary tellurite glass system of the form 80TeO2-5TiO2-(15 - x) WO3-xAnOm where AnOm is Nb2O5, Nd2O3 and Er2O3, x = 0.01, 1, 3 and 5 mol% for Nb2O5 and x = 0.01, 0.1, 1, 3, 5 ... -
Application of homotopy-perturbation method to fractional IVPs
( Elsevier , 2008 , Article)Fractional initial-value problems (fIVPs) arise from many fields of physics and play a very important role in various branches of science and engineering. Finding accurate and efficient methods for solving fIVPs has become ... -
An adaptive Monte Carlo integration algorithm with general division approach
( Elsevier , 2007 , Article)We propose an adaptive Monte Carlo algorithm for estimating multidimensional integrals over a hyper-rectangular region. The algorithm uses iteratively the idea of separating the domain of integration into 2ssubregions. The ... -
Application of generalized differential transform method to multi-order fractional differential equations
( Elsevier , 2007 , Article)In a recent paper [Odibat Z, Momani S, Erturk VS. Generalized differential transform method: application to differential equations of fractional order, Appl Math Comput. submitted for publication] the authors presented a ... -
A Magnetic Transport Middle Eastern Positron Beam
( Elsevier , 2008 , Article)A magnetically guided slow positron beam is being constructed at Qatar University and is currently being optimised for regular operation. This is the first positron beam in the Middle East, as well as being the first Arabic ... -
Simpler is also better in approximating fixed points
( Elsevier , 2008 , Article)In this paper we demonstrate that a number of fixed point iteration problems can be solved using a modified Krasnoselskij iteration process, which is much simpler to use than the other iteration schemes that have been defined
