Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 381-400 of 770
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Application of the Forward Modelling of Sequence Stratigraphy & Diagenesis to The Upper Cretaceous Carbonates Of Western Iraq
( Qatar University , 2000 , Article)Dynamic forward modelling of carbonate diagenesis and sequence stratigraphy relies on the understanding of the different process which provide a high resolution prediction of the geometry of porous and permeable zones ... -
Mechanism of Dehydration of Ethanol over Alumina
( Qatar University , 1981 , Article)The dehydration reaction of ethanol to ether and ethylene was kinetically investigated in a flow system using •y-alumina. Pyridine was found to inhibit the formation of ethylene and ether. The rate of ethylene formation ... -
The influence of certain physical stresses on pulal mortality of Culex pipiens complex L. II. Effect of exposure to oxygen and partial vacuum.
( Qatar University , 1993 , Article)The results indicated that when pupae were exposed to oxygen atmosphere for different periods ranging from V2 - 48 hours, the pupal mortality increased with increasing the exposure periods. The mortality reached to about ... -
Mineralogical And Geochemical Evaluation Of Upper Cretaceous Black Shales, Safaga District, Egypt.
( Qatar University , 1995 , Article)Lithologic and compositional properties of black shale and pyrite from the Upper Cretaceous phosphorite/black shale deposits (Duwi Formation) of Eastern Desert of Egypt indicate similarity in mineralogy, geochemical ... -
The Optical properties of Cadmium Stannate (Cd2SnO4) Thin Films Prepared by Chemical Spry Pyrolysis Technique
( Qatar University , 2004 , Article)Thin films of cadmium stannate were prepared using thermal chemical spray pyrols: Cadmium stannate' solution (0.2M) was prepared by dissolution of CdCl25H2O in C2H5OH tion of SnCl23H2O in CH3COOH at molar 2:1, respectively. ... -
Synthesis And Reactivity Of Substituted Chromones
( Qatar University , 1992 , Article)The synthesis of 2-methyl-and 2-Styryl-6-bromo-7, 8-benzochromone and 2, 6-Dimethylchromone and their reactivity towards cyclo-addition reaction under Diels-Alder conditions and towards nucleophilic and electrophilic ... -
Blastema Volume And Nuclear Size In The Regenerating Hind Limbs In Larvae Of Xenopus Laevis And Bufo Regularis After Transection At The Ankle Level
( Qatar University , 1990 , Article)After amputation at the ankle level of hind limbs in larval Xenopus laevis and Bufo regularis, an increase in the nuclear volume of blastema and stump tissue cells was observed. The cells in the distal region of blastema ... -
Genetic Studies on Escherichia Coli Strains Isolated From Cases of Bovine Mastttis
( Qatar University , 2007 , Article)This study was carried out on 53 milk samples positive for California Mastitis Test taken from eight herds infected with clinical mastitis in Taif City. Mean Somatic cell Count (SCC) was 4, 482, 000 cells / ml. Forty-eight ... -
Changes in carbohydrate and nitrogen fractions during germination of fenugreek (Trigonellafoenum-graecum L.) seeds presoaked in GA3, growing under different osmotic potentials
( Qatar University , 1997 , Article)Changes in carbohydrate and nitrogen fractions during seed germination of fenugreek under water stress and GA^ treatment were investigated. The germination percentage was reduced with the decrease in the osmotic potential ... -
Studies on some cowpea cultivars: II - suitability for aspergillus flavus growth and Aflatoxin production
( Qatar University , 1993 , Article)Sixteen mycotoxin-free seed cultivar samples of cowpea (Vigna unguiculata (L.) Walp.) were inoculated with spores* of Aspergillus flavus Link (IMI 89717) to determine varietal differences in terms of aflatoxin production. ... -
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 ... -
Sediment Distribution Pattern in the Al-Shoaiba Lagoon, Red Sea Coast of Saudi Arabia
( Qatar University , 2003 , Article)The Al-Shoaiba coastal lagoon located on the eastern side of the Red Sea is covered mostly with calcareous sand and muddy sand. Wind derived quartz is the most abundant detrital component in the surficial sediments of the ... -
The One Dimensional Inverse Spectral Problem Of A Generalized Stationary Schrodinger Equation
( Qatar University , 1996 , Article)In this paper we study the inverse problem on the half line for a generalized stationary one dimensional Schrodinger equation. We consider the solutions of the differential equation and study its properties. Given the ... -
Thermometric Study of Inhibition of Aluminium Corrosion in Hydrochloric Acid Solution
( Qatar University , 1997 , Article)The use of 6- amino - 4- (4-phenyl)-l,4- dihydro -3- methylpyrano [2,3- c] pyrazole -5- carbonitrile and some related compounds as corrosion inhibitors for aluminium in 2 M HCl solution was studied by the thermometric ... -
Thermoluminescence induced by gamma radiation In LiCsSO4 Ferroelastic crystal doped With different heavy metals
( Qatar University , 1994 , Article)Thermoluminescence (TL) glow curves of lithium cesium sulphate ferroelastic crystals LiCsSO4 doped with 0.5% of Os, Tb, Eu and Tl have been studied in the temperature range from room temperature to 300"C. Three peaks are ... -
Biochemical studies on the relationship between hypothyroidism and/or some Rheumatic diseases
( Qatar University , 1994 , Article)Sixty seven patients were selected and divided into four groups according to their clinical condition covering normal controls, hypothyroid patients suffering from both hypothyroidism and rheumatic disorders and rheumatic ... -
Generation of Sets of Sequences lsomorphic to Walsh Sequences
( Qatar University , 2005 , Article)Walsh sequences of the order 2k, k positive integer, form an additive group generated by Rademacher sequences set of ft-order. Except the zero sequence, Walsh sequences form an orthogonal set. Our present work allows us ... -
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 ... -
Overhead Allocation: a Goal Programming Approach
( Qatar University , 1981 , Article)Overhead is an incurred cost which is matched against cost objects via an intervening base of allocation. The problem of overhead allocation is to come up with a cost allocation procedure which is objective, applies, ... -
Effect Of Cationic And Anionic Surfactants On Electrokinetic Potentials Of Cassiterite And Quartz In Presence Of Polyvalent Cations
( Qatar University , 1994 , Article)The effect of different polyvalent electrolytes (FeCl3, AICI3, LaCl3, CeCl3 and TI1CI4) on adsorption of different surfactants (primary amine hydrochloride, sodium oleate, sodium dodecyl sulfate and phenyl disodium ...
