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Now showing items 181-190 of 451
Collineations Of Polar Spaces
(
Qatar University
, 1990 , Article)
In this paper we consider general embeddable polar spaces with Witt index at least three.
If π : S( ξ) —> S( ξ’) be a thick collineation between polar spaces with i( ξ) =i( ξ’) ≥3. Then there exists a place Ø: k—> k' U ...
Organic Petrology Of Oil Shales In Quseir-Safaga District, Egypt
(
Qatar University
, 1992 , Article)
The kerogen and hydrocarbon-generating potential of oil shales from three mining districts in the Red Sea province of Egypt have been investigated using microscopy and elemental analysis.
The results reveal that, the ...
Incidence of Nosocomial infection of Pseudomonas aeruginosa in General Basrah Hospital in Basrah City / IRAQ
(
Qatar University
, 1999 , Article)
One thousand and two hunderd twenty six specimens were obtained from patients and 516 swabs from different surfaces of environments Basrah General Hospital were collected. Sixty five patients were suffering from Pseudomonas ...
Rayn formation, a new name for the permian khuff formation (S. S.) In saudi arabia
(
Qatar University
, 1991 , Article)
The rank of the Khuff Formation (late Carboniferous-late Permian) in Saudi Arabia is raised to group status and it is divided into Unayzah (late Carboniferous-early Permian) and Rayn (middle-late Permian) Formations. The ...
Edaphic properties and soil cyanobacteria of South Western Saudi Arabia.
(
Qatar University
, 1997 , Article)
Three sites at each of five localities, in the South Western Region of Saudi Arabia were surveyed during 1992, for their soil physico-chemical properties, and cyanobacterial communities. The soils were moderately calcareous, ...
Proton And Carbon-13 Nuclear Magnetic Resonance Of Some 4-Amino-3-Alkyl (Aryl)-5-Thio-1,2,4-Triazolines And Their Derivatives
(
Qatar University
, 1991 , Article)
The proton and carbon-13 NMR spectra of some 4-amino-3-alkyl(aryl)-5-thio-1,2,4-triazolines, some 3-alkyl-5-thio- 1,2,4-triazolines and some 4-amino-3-aryl-5-thio-l,2,4-triazoles were measured in DMSO-d6 as solvent. The ...
Trace Metals In Qatari Fish And Shellfish
(
Qatar University
, 1991 , Article)
Fish, prawns and crabs purchased at the retail market in Doha, were analysed for cadmium, chromium, copper, lead and zinc. The results indicated significantly elevated concentrations of cadmium in the flesh of the Qatari ...
The Antibiotic Activity Of Some Aquatic Plants And Algal Extracts From Jordan
(
Qatar University
, 1991 , Article)
The antimicrobial activity of the extracts of three fresh water green algae, four marine green algae, two brown marine algae and five red marine algae from the Jordanian part of the Aqaba Gulf, together with four aquatic ...
Marine Algae As Bioindicators Of Pollution Levels In The Arabian Gulf
(
Qatar University
, 1995 , Article)
The extensive distribution of several marine macroalgal species makes them a potential bioindicator tool for monitoring existing levels of different types of marine pollutants in the region. The present work illustrates ...
A Problem In Magneto-Thermoelasticity For A Hollow Circular Cylinder With Thermal Relaxation
(
Qatar University
, 1997 , Article)
The problem of an infinitely long annular cylinder whose inner surface is thermally insulated and whose outer surface is kept at a constant temperature is considered in the presence of an axial uniform magnetic field. The ...