Qatar University Science Journal - [From 1981 TO 2007]: المرسلات الحديثة
السجلات المعروضة 701 -- 720 من 770
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Aeromagnetic Geophysical Investigation In El-Faiyum District, Western Desert, Egypt
( Qatar University , 1985 , Article)The present paper deals with the interpretation of the aeromagnetic survey executed over the Faiyum area. Western Desert, Egypt. Qualitative as well as quantitative interpretation of the aeromagnetic data were carried out ... -
Facile synthesis of several new pyridine and fused pyridine derivatives with Anticipated biological activity
( Qatar University , 1994 , Article)The reactions of benzothiazol-2-N-acetylacetohydrazide 1 with a, (}-unsaturated aldehyde, ketone, ester or diketoester led to the formation of the titled ring systems. The same target was also achieved through the reactions ... -
Liquid chromatographic separation of the enantiomers of racemic A aminophosphonates as their n-3, 5-dinitrobenzoyl derivatives On chiral fluorocarbinol stationary phases
( Qatar University , 1994 , Article)The enantiomers of a wide variety of a-aminoaryl (or alkyl) phosphonate esters are separated by liquid chromatography as their N-3,5-dinitrobenzoyl derivatives on three chiral fluorocarbinol stationary phases. In addition ... -
Formation Parameters Of The Lower Eocene Rocks In Qatar
( Qatar University , 1986 , Article)The study of some carbonate rock samples collected from four different locations in Qatar and attributed to the Rus Formation (Lower Eocene) reveals that these rocks are mainly heterogeneous in their petrophysical ... -
The morphology of synhimantus (dispharynx) passeri sp. Nov., nematoda (acuariidae)
( Qatar University , 1990 , Article)A new species of the nematode genus Syahimantus recovered from Passer domesticus niloticus at Cairo is described using both light and scanning electron microscopy. The taxonomy of the new species is discussed and compared ... -
Petrogenesis And Geochronology Of The Granitic Intrusions Of Gabal Kulyiet And Seiga, South Eastern Desert, Egypt
( Qatar University , 1986 , Article)In the South Eastern Desert of Egypt tonalite. granodiorite and granite intruded intermediate to acidic metavolcanics and volcanogenic metasedimentary rocks of Precambrian age. The geological features of these granitic ... -
Some Inferential Problems in Finite Population Sampling
( Qatar University , 2004 , Article)We review some results in problems of estimating a finite population total (mean) through a sample sur¬vey. Section 2 considers inference under a fixed population model and Section 3 addresses the same prob¬lem when the ... -
Selectivity Coefficient Of Wire Basket Traps For Tilapia Nilotica
( Qatar University , 1984 , Article)Most methods of estimating growth and mortality rates require samples representative of the population with respect to size of one or more age groups. There is no fishing gear that exhibits equal selectivity towards fish ... -
Filtered Dehomogenization Theory For The Micro-structure sheves OY
( Qatar University , 1999 , Article)In this work we study the theory of dehomogenization at the level of filtered sheaves using the micro-structure sheaves. For the sheaf of quantum section the results are still true. -
Effects Of Overfishing And Abandoning Bottom Trawling On Qatar's Fisheries
( Qatar University , 1996 , Article)The present study was conducted to overview the effects of abandoning bottom trawling and increasing fishing effort on the structure and dynamics of Qatar's fisheries during 1985-1994, using the fishery statistics data, ... -
Scanning Electron Microscopy Of The Egg And The Second Stage Larva Of Toxocara Vitulorum
( Qatar University , 1996 , Article)The surface topography of the egg and 2nd stage larvae of the nematode Toxocara vitulorum are described by scanning electron microscopy. The eggs are oval and their surfaces are characterized by the presence of distinct ... -
The structure of tetraketones in the solid state: the crystal structure of 1,6- Diphenylhexane-1,3,4,6-tetrone
( Qatar University , 1994 , Article)The crystal structure of l,6-diphenylhexane-l,3,4,6-tetrone was determined, CjgHi4O4, M 294.31 monoclinic, space group P2j/n (# 14), a 5.1192 (6) A, b 9.085 (9) A, c 15.366 (4) A, b 97.91 (4)°, p (calc) 1.362 g/cm3, Z 2, ... -
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. -
A New Liquid Membrane Electrode For Selective Determination Of Caffeine
( Qatar University , 1984 , Article)A new liquid membrane electrode for caffeine prepared from a solution of caffeine-picrylsulfonate ion-pair complex in n-octanol is developed. It exhibits Nernstian response in the range of 10'2 to lO^M caffeine with a ... -
Weed Communities Of Date Palm In Eastern Arabia
( Qatar University , 1992 , Article)The present study deals with the recognition and description of the weed communities of date palm plantations in Al-Hassa Oasis, . Eastern Arabia. Thirty three communities are recognized. They are classified, after the ... -
Corrosion of n-GaAs/aqueous Photoelectrochemical Cell
( Qatar University , 2005 , Article)A combination of electrochemical studies, scanning electron microscopy, SEM, and light reflectivity measurements reveals information about the corrosion of enlightened n-GaAs in various aqueous electrolytes. The corrosion ... -
Evaluation of methods for screening of extracellular cellulase In filamentous fungi
( Qatar University , 1996 , Article)Twenty-eight fungal species belonging to fifteen genera were isolated from Saudi Arabian soil and were screened for the production of extracellular cellulase enzymes. Cleared-zone technique, cellulose azure method and agar ... -
Comparison of antibiotic susceptibilities of four species of coagulase-negative staphylococci isolated rom normal skin and acne Lesions: a statistical approach
( Qatar University , 1996 , Article)Ten strains of each of four species of coagulase negative staphylococci: S. epidermidis, S. hominis, S. capitis, and S. cohnii isolated from both acne lesion and normal skin (total 80 strains) were tested for their antibiotic ... -
Vibrational Analysis Of TaBr5
( Qatar University , 1987 , Article)Vibrational analysis for TaBr5 is achieved on the basis of D3h symmetry and employing GF matrix method. Each vibration is quantitatively assigned according to the calculated values of the potential energy distributions. ... -
On the direct problem and scattering data for a singular system of differential Equations with discontinuous coefficients
( Qatar University , 1996 , Article)A system of Sturm-Liouiville differential equations of order n with a density matrix function is considered. The direct problem of the considered system is studied and hence the scattering data of the problem is obtained.
