Browsing Qatar University Science Journal - [From 1981 TO 2007] by Title
Now showing items 687-706 of 770
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Studies On The Effect Of Cadmium Chloride On The Gonads Of The Developing Chick Embryos
( Qatar University , 1987 , Article)Cadmium chloride was injected in doses of 5, 10, 15 and 20 /xg/egg into the yolk sac of 4—day—old chick embryos. Mortality due to cadmium intaxication increased with dose increase. The mortality rate of chick embryos ... -
Studies On The Trematodes Of The Genus Enenterum Linton, 1910 (Opecoelidae) And The Oenus Pseudocreadium Layman, 1930 (Lepocreadiidae) From Some Red Sea Fish
( Qatar University , 1985 , Article)The genera Enenterum and Pseudocreadium are reviewed. It is suggested that Pseudocreadium indicum Madhavi, 1972 should be considered a synonym of P. balistes Nagaty, 1942. Enenterum pimelopteri Nagaty, 1942, is redescribed ... -
Study Of Aerobiology Of Alexandria, Egypt
( Qatar University , 1991 , Article)The present study provides a survey of atmospheric pollen and fungal spores in the city of Alexandria with the aim of supplying information that may be useful in the treatment of aeroallergies. Considerable attention has ... -
A Study Of Atmospheric Transparency Over Qena In Upper Egypt
( Qatar University , 1995 , Article)Atmospheric transparency over Qena/Egypt has been studied for direct solar radiation values . which were calculated from global and diffuse solar radiation measurements . The mean monthly of the instantaneously transparency ... -
Study of carbonate rocks of the khuff and Jubaila formations , saudi arabia by Thermal derivatography
( Qatar University , 1997 , Article)Thermal derivatographic analysis of the Khuff and Jubaila carbonate rocks shows that calcite and / or dolomite (of calcitic type) are the main constituent minerals. Their differential thermal and thermogravimetric behaviours ... -
The Study Of Compaction Using Seismic Velocity Analyses In East - Baghdad Oil Field (Mid - Iraq)
( Qatar University , 1995 , Article)The present study deals with estimation of empirical equations relating travel time (T) and transit time (T.T) with depth (Z) which are expressed in the forms : T = BZN + A, log T. T. = - s log Z + H For this aim, ... -
A study of contamination of the northern Jordan valley agricultural fields by various metal ions using regression analysis.
( Qatar University , 2000 , Article)Geochemical analysis were performed in lower subsurface soil samples of 10,20,30 and 40cm depth, collected from seven regions in the northern Jordan valley. Eighteen descriptors (variables) for each sample were used. Among ... -
Study of Magnetic Properties and Lattice Dynamics of the Cdx Co1-x Ferrite System by MossbauerEffect
( Qatar University , 1981 , Article)The magnetic properties and lattice dynamics of the spinel ferrite system Cdx Coi-x Fe^ 04 (x = 0.0, 0.1, . . . , and 1.) were studied in the temperature range between 78 to 800°K. The results showed that the samples with ... -
A study of nutrient dynamics in the coastal dunes of northwestern egypt.
( Qatar University , 1990 , Article)Biomass and nutrient cycling are evaluated in sites of Ammophita arenaria and Onoaisvaginalis which are among the most common species growing on the coastal dunes of the western desert of Egypt. Both species accumulate N ... -
Study of the Hydration of Blast-Furnace Slag Cement and Portland Cement by Mossbauer Spectroscopy
( Qatar University , 1982 , Article)Mossbauer spectra have been measured for the hydrated blast-furnace slag cement and Portland cement pastes at different times of hydration of 1. 3. 7. 28 and 90 days. The spectra showed the existence of iron atoms, Fe3 (T) ... -
A study on summability factors of infinite series
( Qatar University , 1997 , Article)A new theorem concerning N,p q , summability factors of infinite series are deduced. -
Study The Effect of Classical And Rapid Thermal Annealing on The Electrical Characteristics of P-Ge/P-si Heterojunction
( Qatar University , 2002 , Article)This paper describes the effect of classical thermal (CTA) and rapid thermal annealing (RTA) on the electrical characteristics (I-V, C-V) of isotype Ge/Si heterojunction. The I-V characteristics were improved after annealing ... -
Subsurface Exploration for Construction of Lightning Protection System Using the Geophysical Methods, Alexandria, Egypt (A Case Study)
( Qatar University , 1997 , Article)Both electrical resitivity and total intensity magnetic measurements are combined together in an integrated manner to explore the subsurface layer and behavior of magnetic field in an area, where lightning protection ... -
Subsurface geothermal investigation in the nile delta, egypt.
( Qatar University , 1983 , Article)The Nile Delta area is geothermally studied to define the behaviour of geothermal gradient in different wells and to determine the distribution of heat in some interesting rock formations. The geothermal investigation of ... -
Subsurface Geothermal Study In The Central Part Of The Northern Western Desert, Egypt
( Qatar University , 1983 , Article)Geothennal investigation of the studied area was carried out using the bottom hole temperatures recorded in deep wells drilled for petroleum exploration. The study revealed interesting data regarding the geothennal gradient ... -
Sulphur Oxidation In Saudi Arabian Agricultural Soils
( Qatar University , 1996 , Article)Laboratory studies were conducted to determine the oxidation of elemental sulphur in eight localities of Saudi Arabian soils. The effect of sulphur application on related properties of calcareous soils in Saudi Arabia was ... -
The Superimprimitive Subgroups Of The Alternating Group Of Degree 8
( Qatar University , 1984 , Article)A transitive permutation group G is called superimprimitive if it is imprimitive with non-trivial block systems of imprimitivity of lengths all the non-trivial divisors of the degree of G; The superimprimitivity concepts ... -
Survey of marine turtle nest sites in the UAE.
( Qatar University , 1999 , Article)The United Arab Emirates is party to the Regional Convention for Co-operation on Protection of the Environment from Marine Pollution, and the Action Plan for the Protection and Development of the Marine Environment and ... -
Synergistic effect of amino acids and chloride ion on adsorption On copper metal
( Qatar University , 1994 , Article)The effect of adsorption of a- alanine, P-alanine, DL-aspartic, L-glutamine, iso-leucine and L-lysine in 1 M HC1 solution on the corrosion of copper has been studied using the potentiokinetic technique. The examined amino ... -
Synthesis And Biological Activity Of Some New 4-(Aminoacyl) Aminopyridines And 2-(Aminoacyl) Aminopyrimidine Derivatives
( Qatar University , 1983 , Article)The synthesis of 4-(N-Tos and N-Pht-aminoacyI) aminopyridines (III - XIV) and 2-(N-Pht-aminoacyl)-aminopyriniidines (XV-XXIV) has been achieved employing the acid chloride and carbodiimide methods. Hydrazinolysis of ...