Browsing Qatar University Science Journal - [From 1981 TO 2007] by Title
Now showing items 455-474 of 770
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Observations on some hydrochemical aspects of the United Arab Emirates waters along the Arabian Gulf and the Gulf of Oman.
( Qatar University , 1997 , Article)Surface and bottom water samples were collected from the United Arab Emirates waters along the Arabian Gulf and the Gulf of Oman during the period from October 1993 to September 1995. Samples were analyzed for temperature ... -
Occurence of Phytoplankton in Stomach Content and Its Selectivity by Nile Tilapia (Oreochromis niloticus L.) Cultured in Fertilized Earthen Ponds
( Qatar University , 2003 , Article)Nile tilapia (Oreochromis niloticus L.) was cultured in earthen ponds receiving 0, 20, 40, 60 and 100 kg/feddan/month of inorganic fertilizer (20:20:5 N:P:K). The obtained results showed that the composition percentage of ... -
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 New Haemogregarine Of Varanus Griseus From Egypt
( Qatar University , 1996 , Article)Ten monitors, Varanus griseus collected from various localities in Egypt were examined for protozoan blood parasites. A new species of the genus Haemogregarina senso lato is reported from six of these monitors. Blood forms ... -
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 ... -
On Existence Of Two Real Periodic Solutions Of Differential Equations Of Riccati Type
( Qatar University , 1986 , Article)In this paper we consider the two equations z^z^p^z+r^t), (*) z^z^ptOz+r^t), (••) where z € C, p, r) and r^ are real, continuous and periodic with period T. It was shown ... -
On Finite Group Actions On The Solid Klein Bottle
( Qatar University , 1989 , Article)In this paper we classify all G-actions on the solid Klein bottle when G= Z2 and when G= Z^ ® Z2. -
On Prosthodendrium parvouterus (Trematoda : Lecithodendriidae) A Parasite of The Bat Taohozous nudiventris
( Qatar University , 1999 , Article)The naked-bellied bat Taphozous nudiventris nudiventris Gretzschmar, 1831 is recorded for the first time from the Qatari Penninsula. Prosthodendrium (Prosthodendrium) parvouterus (Bhalerao, 1926) Dubois, 1955 (Trematoda: ... -
On sexual dimorphism in the shrimp Palaemon pacificus (decapoda: palaemonidae) Collected from the red sea
( Qatar University , 1994 , Article)Palaemon pacificus is common in the Red Sea coast and the sexes are separate. Potential sexual dimorphism in 38 morphological parameters was investigated in a population of Palaemon pacificus collected from the Red Sea ... -
On Some Shrinkage Techniques For Estimating The Parameters Of Exponential Distribution
( Qatar University , 1986 , Article)A variety of shrinkage methods have been proposed for estimation of some unknown parameter by considering estimators based on a prior guess of the value of the parameter. We compare some of the shrunken estimators for the ... -
On Some Tintinnids (Protozoa : Ciliata)From The Strait Of Hormoz And The United Arab Emirates Waters
( Qatar University , 1995 , Article)An examination of plankton samples collected from the oceanic waters of the Strait of Hormoz and the UAE inshore and offshore waters revealed the presence of a diverse community of planktonic Tintinnida (Protozoa). 38 ... -
On Stability in Multiobjective Integer Linear Programming: A Stochastic Approach
( Qatar University , 2006 , Article)In this paper we consider a multiobjective integer linear stochastic programming problem individual chance constraints. We assume that there is randomness in the right-hand sides of the constraints only and that the random ... -
On Symboloic Reasoning and Direct Inference Principle
( Qatar University , 2004 , Article)This paper discusses an approach using the M-valued symbolic logic with syllogistic reasoning and direct inference principle (reasoning from statistical information to conclusions about individuals), to manipu¬late statistical ... -
On the application of arabian gulf water in irrigation: A future possibility
( Qatar University , 1987 , Article)Open seas waters have a chlorinity (Cl%o) of 35%o. Chloride and sodium are the dominant ionic species in sea water; where their gravimetric contents are 89.98 and 77.39% of total anions and cations, respectively. Sodium ... -
On The Behaviour Of The Solutions Of ff …...
( Qatar University , 1984 , Article)The above equation plays an important rote in the geometric theory of functions of a complex variable. To determine interval estimations for its solutions, an inequality is obtained using the fixed point theorem. Then, ...