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Now showing items 11-20 of 125
Guaianolides from Centaurea sinaica
(
Elsevier
, 1990 , Article & Report)
Three sesquiterpene lactones were isolated from the aerial parts of Centaurea sinaica: amberboin, chlorohyssopifolin A and sinaicin. The latter is reported for the first time.
Synthesis And Spectroscopic Properties Of Some Mixed-Ligand Complexes Of Nickel (II), Copper (II), Zinc (II) And Palladium (II) With Biologically Active Nitrogen-Sulphur Containing Molecules
(
Qatar University
, 1990 , Article)
The reaction of the biologically active complexes, chloro-2-acetylpyridinehyd-razinecarbothiopiperidinamide metal (II) and chloro-2-acetylpyridinecar-bothiomorpholinamide metal (11),^, (M=Ni (II), Cu (II), Zn (II) and Pd ...
الأسس الدستورية للتعليم في دول الخليج العربية
(
Qatar University
, 1990 , Article)
الهدف من هذه الدراسة هو التوصل إلى معرفة ما تقرره دساتير الدول العربية الخليجية بشأن
التربية والتعليم ومعرفة أهم الاتجاهات العامة المشتركة بينها.
وقد تطلبت الدراسة تحليل مضمون دساتير الدول العربية والخليجية التي لها ...
Studies On Catch Rates Of Bottom Trawlers In Qatar Waters, Arabian Gulf
(
Qatar University
, 1990 , Article)
Data pertaining to catch, effort, time, space, landing, commercial value, by-catch and some environmental parameters covering the period from 1983 to 1988 were used in this regard. The results conformed that; the CPUE ...
Geology, Petrography, Geochemistry And Petrogenesis Of The Egyptian Younger Granites
(
Qatar University
, 1990 , Article)
One hundred and thirty nine new chemical analyses of major and trace elements for 26 plutons and masses pertaining to the Egyptian Younger Granites are presented together with the chemical analyses of 13 biotites, 32 ...
التحصيل اللغوي لدى تلاميذ المرحلة الإبتدائية
(
Qatar University
, 1990 , Article)
التحصيل اللغوي لدى تلاميذ المرحلة الابتدائية في المملكة العربية السعودية
( ملخص البحث )
من الملاحظ أن نسبة كبيرة من تلاميذ المرحلة الابتدائية يعانون من ضعف شديد في مادة اللغة العربية بفروعها ، وهذه النسبة من التلاميذ ...
Stochastic Classes Of Life Distributions
(
Qatar University
, 1990 , Article)
The concept of stochastic ordering of random variables is used to characterize the behaviour of the life length variables. This leads to some new classes of ageing namely, the stochastic classes of life distributions. The ...
A Class Of Functions Stronger Than M-Precontinuity, Preirresolute And A-Functions
(
Qatar University
, 1990 , Article)
We propose a definition for a new class of functions that may be stronger than the previous types. Some of its characterizations, connections with known ones and the effect of them on some topological spaces are studied .
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, ...
Lineament Analysis Of Qatar Peninsula Based On Landsat Imagery
(
Qatar University
, 1990 , Article)
Photo-interpretation of Landsat MSS images of Qatar Peninsula reveals several surface lineaments of different types, extentions and trends. Some of these photo-lineaments are of structural nature while others represent ...