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Now showing items 71-80 of 10117
Primary Productivity of Lake Manzalah, Egypt, using C14 technique
(
Qatar University
, 1981 , Article)
The hydrographical and chemical conditions of Lake Manzalah, Egypt, are influenced by the surging in of saline water from the Mediterranean sea and are by no means stable. The average of the parameters studied during the ...
Chemical stabilization of baiji sand dunes in iraq 1. Effect of some soil stabilizers on the infiltration rate of sand
(
Qatar University
, 1995 , Article)
In this study, the effect of soil chemical stabilizers including polyvinyl alcohol 125,000 (PVA) (0.2% and 0.4%); ferquatac resin emulsion RB-50 (F.E.) (0.14, 0.18, 0.2 and 0.4 lm'2); bitumen emulsion Al-55 (B.E.) (0.3, ...
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 ...
S.G. Connected Spaces
(
Qatar University
, 2000 , Article)
The purpose of this paper is to introduce and study a strongr type of connectedness called s.g connectedness in topologi-cal spaces.
Urea Hydrolysis and Urease Activity in Saudi Arabian Soils
(
Qatar University
, 2000 , Article)
Soil samples were collected from eight different localities m Saudi Arabia, and analysed for mechanical properties as well as for urea hydrolysis. The urease enzyme activity of these calcareous soils was also investigated. ...
Investigation Of Single-Update Memoryless Cg-Methods
(
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 ...
Relation between Quasi-normed Ideals of Entropy Numbers and of Approximation Numbers
(
Qatar University
, 1981 , Article)
Let en(T) and an(T) be the entropy numbers and approximation numbers of operator T between Banach spaces, respectively. Let ?p be the operator ideal defined by
Sp:^TeL;{en(T)^lp}, and Sp be the operator ideal defined ...
Density and diversity of the desert Arthropoda of Qatar
(
Qatar University
, 1997 , Article)
Density and diversity of arthropods were studied at different habitats of the Qatari desert. Diurnal sampling was conducted at two seasons of the year, the end of the dry season, at the beginning of autumn (October) in ...
Effects of gamma radiation on the activity of the, mosquito culex pipiens L. : I. Effects on the attraction of the mosquito to light, colours and host
(
Qatar University
, 1988 , Article)
The present work was carried out to investigate the effects of gamma radiation at three doses: 40, 80 and 120 Gray. On the response of the adult mosquito Culex pipieas complex when irradiated in the larval, pupal or adult ...
Concerning Sequential Spaces
(
Qatar University
, 1985 , Article)
In this paper, important notions concerning sequential spaces are clarified new ideas, one of which is a complete and direct proof of the fundamental theorem characterizing sequential spaces, are introduced.