Qatar University Science Journal - [From 1981 TO 2007]: المرسلات الحديثة
السجلات المعروضة 101 -- 120 من 770
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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 ... -
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. ... -
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. -
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 ... -
A List of Marine Algae from Seashores of Iran (Hormozgan Province)
( Qatar University , 1999 , Article)Seashores of Hromzgan province in south of Iran were studied for collection and recogna-tion of algal flora (1991-1996). 150 species of marine algae were recognized, including 36 Chlorophyta (16 new). 33 Phaeophyta (15 ... -
Ciliates and Other Microorganisms in the Plankton from Al-Sammaliah Island- Arabian Gulf-United Arab Emirates
( Qatar University , 1999 , Article)Al-Sammaliah Island is one of more than 200 islands belonging to United Arab Emirates in the Arabian Gulf. This inshore shallow island lies at the north east coast of Abu Dhabi and is connected to the Arabian Gulf through ... -
Synthesis and reactivity of 2-chloro-4-phenyl-6-p-tolyl-nicotinonitrile Towards some nucleophiles
( Qatar University , 1986 , Article)The synthesis and reaction of 2-Chloro-4-phenyl-6-p-tolyl- nicotinonitrile (I) with hydrazine hydrate, sodium azide and urea to give the corresponding hydrazino tetrazolopyridine and urea derivatives respectively, are ... -
Some Unique Characteristics Of The Indian Ocean
( Qatar University , 1999 , Article) -
Qualitative Dealing with Quantified Assertions
( Qatar University , 2002 , Article)In this paper we present a newapproach to a symbolic treatment ofquan-tified statements having the following form "Q A's are 5's", knowing that A and B are labels denoting sets,and Q is a linguistic quantifier interpreted ... -
Application of the resistivity method to study ground water potentialities on a part of the entrance of wadi el-assiuti, Eastern desert, Egypt
( Qatar University , 1993 , Article)Wadi El-Assiuti is located east of Assiut city and extends in almost northeast direction. The entrance of the wadi is suitable site for reclamation and city planning projects. Consequently, it is very important to study ... -
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 ... -
Neurosecretory Cells In Certain Earthworms Species (Oligochaete)
( Qatar University , 1987 , Article)Typical Neurosecretory cells of the cerebral ganglion were studied in three oligochaete families: A. porrectodea caliginosa, Dendrodrilus rubidus: (Lumbricidae)'; Amynchas corticis : (Megascolidae); Dichogaster bolaui: ... -
Nitrogen fixation in polluted sea water of Alexandria coast, Egypt.
( Qatar University , 1990 , Article)The inshore area of the Mediterranean water, west of Alexandria, Egypt, is subjected to different types of pollutants. Nitrogen fixation rate was studied in this area in relation to some environmental factors such as pH, ... -
Design And Implementation Of A Microprocessor Controlled Digital Filter
( Qatar University , 1991 , Article)The construction and implementation of a microprocessor controlled real time recursive digital filter have been given. The system designed could also be applied to a variable coefficients system such as ADAPTIVE FILTER and ... -
Effects of the electric field and gamma Radiation on the optical properties of Modified low density polyethylene
( Qatar University , 1997 , Article)The effect of electric field and gamma radiation on the optical properties of low density polyethylene LDPE grade CD 0230 have been studied. The samples were irradiated at gamma doses of 0-100 Mrad and varying electric ... -
Khashm Formation, A New Lithostratigraphic Unit Within The Cretaceous Wasia Group Of Arabia
( Qatar University , 1988 , Article)The Khashm Formation is introduced as a new lithostratigraphic unit to include the sandstones and shale interbeds which constitute the upper part of the Cretaceous Wasia Group (s. /.) outcropping in central Arabia. It ... -
Helminth parasites of fishes from the arabian gulf 3. On pseudoplagiopobus microrchis, yamaguti, 1942 (digenea: opecoelidae)
( Qatar University , 1987 , Article)The trematode genus Pseudoplagioporus Yamaguti, 1938 is briefly reviewed. P. microrchis Yamaguti, 1942 is redescribed from Lethrinus lentjan and L. nebulosus caught from Qatari waters in the Arabian Gulf. This is the first ... -
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 ... -
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. -
Review of the genus polymorphus luhe, 1911 (acanthocephala:polymorphidae), with the synonymization of hexaglandula petrochenko, 1950, and subcorynosoma hoklova, 1967, and a key to the species
( Qatar University , 1992 , Article)The position, concept and composition of the genus Polymorphus (= Profilicollis Meyer, 1931; Falsifilicollis Webster, 1948; Parafincollis Petrochenko, 1950; Subfilicollis Hoklova, 1967) are critically evaluated and a new ...
