Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 461-480 of 770
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Dinoflagellate Cysts and Miospores from the Albian - Cenomanian Sequence of the Qarun 2 - 1 Borehole, Western Desert, Egypt
( Qatar University , 1993 , Article)Rich distinctive dinoflagellate cyst assemblages together with significant numbers of miospores were recovered from seven cuttings samples in the Qarun 2 - 1 borehole between 2718 - 2854 m. This association represents a ? ... -
Effect Of Adsorption Of Tetrabutylammonium Chloride In Polarography
( Qatar University , 1994 , Article)The polarographic behaviour of chromate, iodate and zinc has been investigated in the presence of different concentrations of tetrabutylammonium chloride in 0.1 M Na2SO4 and 0.1 M H2SO4. The effect of organic compound on ... -
On The Existence And Uniqueness Of Solutions Of A Functional Differential Equation
( Qatar University , 1983 , Article) -
Diffusion Problems Arising In Mathematical Biology 2
( Qatar University , 1996 , Article)In this paper we consider long range diffusion, examine the local behavior of epidemics in Lp'q. In section 1 of chapter 2 we develop a model, the long range diffusion pressure in planktonic patchiness and then in secion ... -
On Dirichlet Problem With Singular Integral Boundary Condition
( Qatar University , 1983 , Article)In this paper a Dirichlet problem, with singular integral condition, is studied. It is shown that such problem can be reduced to a regular equation which allows us to construct the solution. -
Comparison of mechanical shaking, ultrasonication and Homogenization as techniques used in removing attached Bacteria and their effects on the associated protozoa
( Qatar University , 1994 , Article)During studying of Protozoa in the slow sand filter beds in Ashford Common Water Treatment Work (London, U.K.), it was found necessary to study the interstitial and attached bacterial populations involved with sand particles, ... -
Constituents of plants growing in Qatar xxiv phytochemical investigation of salvia aegyptiaca L.
( Qatar University , 1994 , Article)The study of the flavonoids revealed the isolation and identification of luteolin, luteolin 7-O- glucoside, apigenin and apigenin 7-0 glucoside; their identity was proved by m.p., TLC, UV, IR and MS. Moreover, a coumarin ... -
On the application of arabian gulf water in irrigation: A future possibility
( Qatar University , 1987 , Article)Open seas waters have a chlorinity (Cl%o) of 35%o. Chloride and sodium are the dominant ionic species in sea water; where their gravimetric contents are 89.98 and 77.39% of total anions and cations, respectively. Sodium ... -
Mineralogy and Genesis of Heavy Minerals in Coastal Dune Sands, South Eastern Qatar
( Qatar University , 1999 , Article)Large amounts of aeolian sand occur in the southeastern coastal zone of Qatar Peninsula as sand dunes accumulated in a vast sand field locally called " Niqyan Qatar ". The present work, carried out on a sand dune belt of ... -
Energy Exchange Between The Sea And The Atmosphere At Doha Harbour (Qatar) In The Arabian Gulf
( Qatar University , 1996 , Article)Meteorological and oceanographic data from 1979 to 1988 have been analyzed and utilized to calculate the heat budget terms of the water at Doha Harbour. The monthly mean of solar radiation has the largest annual amplitude, ... -
The P-Center And The P-Median Problems In Graphs With Small Number ' Of Spanning Trees
( Qatar University , 1996 , Article)In this paper, we will describe some algorithms and give their complexity as following: (1) The algorithm for finding a dominating set of radius r in a vertex-weighted graph with small number of spanning tress. The ... -
A Remark On Proper Left H* — Algebras
( Qatar University , 1984 , Article)W. Ambrose gave the theory of proper H* -algebras and M. Smiley in (2) gave an example of a left H* -algebra which is not a two-sided H* -algebra. Then he modified some of the arguments of Ambrose which yield the structure ... -
Some Properties Of Class Zw
( Qatar University , 1987 , Article)In paper |5| it was established Ilic inajorant w. Bill ex.iinples or a func'lion f £ Zw'were not coiistruclecl. In Illis |)is()er, in llie case of a snioolli closed curve, an example of such a function is constructed. -
The Flora of The State of Qatar: Its History and Present-Day Status
( Qatar University , 2005 , Article)The history of botanical exploration in the State of Qatar is of recent origin. Various collections culminated in 2 major Floras for the State of Qatar in 1981 and 1983. Since then, further collections and focus on several ... -
Aptian To Cenomanian Palynomorphs From The Qarun 2-1 Borehole, Western Desert, Egypt
( Qatar University , 1993 , Article)Rich distinctive, miospore assemblages are recovered from four sidewall core samples obtained from the Kharita Member of Burg El Arab Formation in the Qarun 2-1 borehole located in the eastern part of the North Western ... -
Geological interpretation of gravity data On a part at the western region of the High Dam Lake, South Egypt
( Qatar University , 1999 , Article)The structural setting of the area was determined using the horizontal gradient of the gravitational field and the statistical analysis of its maximum trends. The gravitational field was resolved into its two components; ... -
Synthesis And Spectroscopic Studies On Some Ruthenium(II) Complexes
( Qatar University , 1994 , Article)The salt [RuCl2(CO)2ln has proved very useful precursor for the syntheses of a variety of organometallic complexes of transition metals. The compounds of dichlorodicarbonylruthenium(II) of the formula [RuCl2(CO)22L] or ... -
Algebraic Approach to Formal Microstructure Sheaves and Formal Quantum Sheaves Over Projective Schemes
( Qatar University , 2007 , Article)The I-adic non-commutative filtrations have crucial applications in the study of Lie algebras and the integral group rings. The I-completion R of a commutative ring R is considered a useful tool in algebraic geometry. Here ... -
Circulation And Water Masses And Their Implication On Pollutant Transport During Summer In Abuquir Bay (Egypt)
( Qatar University , 1991 , Article)Abuquir Bay is a shallow area with a mean depth of about 10 meters, and it is affected by significant sources of industrial and agricultural pollutants. Water masses, the distribution of dissolved oxygen and total suspended ... -
Triaryl And Trialkyl Phosphites As Corrosion Inhibitors For Copper In Nitric Acid
( Qatar University , 1992 , Article)Some triaryl and trialkyi phosphites were investigated as inhibitors of the corrosion of copper in nitric acid. The values of inhibitor efficiency from weight-loss measurements are in good agreement with those obtained ...
