Search
Now showing items 81-90 of 1381
Appraisal into Phytochemistry and Taxonomy of an Old Plant Collection from The Middle East
(
Qatar University
, 1997 , Article)
The English traveller Richard Pococke (1704 -1765) visited the Middle East during the period 1737-1740 and collected medicinal plants from localities in Egypt and Arabia. This collection gave a description of the Middle ...
A Numerical Solution For The Bending Of A Plate Using The Boundary Element Method
(
Qatar University
, 1992 , Article)
In this paper the numercial solution for the bending of a plate is considered. The method used is called the Boundary Element Method (BEM). The BEM is a numerical method based on the boundary integral equation formulation ...
Numerical Abundance And Species Diversity Of Surface Zooplankton In The Coastal Waters Of United Arab Emirates On The Arabian Gulf A Preliminary Study
(
Qatar University
, 1999 , Article)
Surface zooplankton of the coastal waters of the United Arab Emirates was studied bimonthly during the period September 1997 to July 1998. Species diversity, numerical abundance and seasonal dynamics were analyzed , at six ...
An Analysis Of The Ranges Of Globigerinina (Foraminiferida) Genera And Their Bearing On The Cretaceous-Tertiary Boundary
(
Qatar University
, 1991 , Article)
An analysis of the Globigerinina genera from the Middle Jurussic to Holocene, using the method of Cutbill & Funnell, indicates that a major break of the Globigerinina genera occurred at the Maastrichtian-Paleocene boundary ...
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 ...
Inhibition of Aluminium Corrosion in Hydrochloric Acid
(
Qatar University
, 1993 , Article)
The inhibitive effect of oximes, P-diketones and hydrazides, on the corrosion of aluminium in 2M HC1 has been investigated galvanostatically. The results suggest that, in presence of inhibitors, the anode is preferentially ...
Synthesis of some newer indazolyl-oxadiazoles, thiadiazoles and 1,2,4-Triazoles
(
Qatar University
, 1994 , Article)
2-Aryl-3-chloro-2H-indazole (4), obtained in excellent yield (>90%) by the action of thionyl chloride on o-azidobenzanilide(3), was allowed to condense with ethyl p-aminobenzoate to afford the corresponding indazolo-ester ...
Combined effects of oxygen, partial vacuum, temperature, humidity and gamma radiation on mating competitiveness of culex pipiens complex l. Males
(
Qatar University
, 1993 , Article)
When the pupal stage of Culex pipiens complex L. male mosquito was exposed to gamma radiation (60 Gy), oxygen, partial vacuum (0.1 torr), low temperature (10°C), for one or two hours, or low humidity (31% R. H.) for 3 ...
Synthesis, spectroscopic and thermal properties of some ionic polymers and polymeric complexes derived from phthaloyl bis (s-methylhydrazinecarbodithioate).
(
Qatar University
, 1990 , Article)
Mono- and bis hydrzides derived from the condensation of S-methylhyd-razinecabodithioate with benzoylchloride and tere- and iso-phthaloydichloride, respectively, were prepared. Their reactions with secondary ...
Homomorphisms And Subalgebras Of Ms-Algebras
(
Qatar University
, 1995 , Article)
According to the characterization of MS-algcbras from the subvaricty Kj by mean of the triple construction, we characterize the homomorphisms and the subalgebras of the MS-algcbras. Also, we solve the "Fill-in" problem for ...