Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 301-320 of 770
-
On the effectiveness of the vlf-em method For ground water prospecting in the Basement terrains, Sinai, Egypt
( Qatar University , 1997 , Article)The VLF-EM method is proved to be an effective, fast and inexpensive tool for ground water prospecting in the basement terrains of Southern Sinai. The resistive shallow alluvial deposits increase the penetration depth of ... -
Solid-State Ac-Conductivity Analysis For The Long Debated Catalytic Activity Of The Boralite Sieve
( Qatar University , 1996 , Article)The ac-phase dependent impedance, capacitance and dielectric loss of boralite are measured and correlated with those of a similar history HZSM-5 as a function of frequency (0.1-100 kHz) and temperature (373-638 K) at 0.8 ... -
Elliptic surfaces over a genus 1 curve with exactly the pair (I8, IV) of singular fibers
( Qatar University , 2000 , Article)In this paper we classify all minimal elliptic surfaces (TI : E —> C) over a genus 1 curve C, with a section and exactly the pair (Is, IV) of singular fibers. -
Changes In Biomass Gain, Protein Content And Hormonal Levels In Wheat Kernels In Response To Soil Drench With Sodium Salicylate
( Qatar University , 1992 , Article)Drenching of soil with sodim salycylate (800,4000 and 8000mg/l) increased grain f. wt. and d. wt. Protein content was increased in grains at days 23 and 60 with 800 mg/1 salicylate. With higher doses "4000 and 8000mg/l ... -
Dominance Value And Community Production Of Desert Arthropoda In Qatar
( Qatar University , 1999 , Article)Diurnal sampling of epigeal Arthropoda from different desert habitats in Qatar was carried out at the end of the summer season (October) and in spring (April) of 1995, 1996 and 1997. Dominance values of the species collected ... -
Influence of The Activated Qatari Attapulgite Clay Admixture on The Mechanical Properties and Hydration Kinetics of Ordinary Portland Cement
( Qatar University , 2001 , Article)Blended cements are types of cements containing additives other than those used m Portland cement, which have considerable technological interest, because such addition increases the chemical resistance to sulfate and ... -
Disign and Implementation of a System for Visual Programming
( Qatar University , 1999 , Article)The aim of the project of this paper is to design and implement a system for visual programming, based on data flow graphs. Data flow is applicative and based on transformations on data flowing through a graph. The system ... -
Preliminary sequence stratigraphy and tectonic evolution of the Tokar Delta, (Southern Sudanese Red Sea)
( Qatar University , 2007 , Article)The study area comprises about 2500sq.Kms. From the seismic data acquired by the Oil Companies (Chevron 1975-76 Total 1980 and IPC 1992), thirty two seismic lines were selected Fig (2). Also synthetic seismograms of Suakin-1, ... -
On The Prawn Fisheries in the Gulf of Suez, Egypt
( Qatar University , 1993 , Article)Prawn fisheries in the Gulf of Suez constitute about 13.7% of the total fish and shrimp landings. About 11% are made up by three penaeid species namely: Penaeus japonicus Bate, Penaeus semisulcatus De Han and Penaeus ... -
Growth and production of tropane alkaloids by cell suspension cutures of hyoscyamus albus L.
( Qatar University , 1990 , Article)Cell suspension of Hyoscyamus albus L. were investigated for growth and production of tropane alkaloids in three different media. The effects of sucrose concentration and initial pH were also studied. 2,4- Dichlorophenoxyacetic ... -
Application of discriminant score /∆ log r method for prediction of Organic richness at negelah well, coastal Mediterranean zone, western desert Egypt
( Qatar University , 1995 , Article)Both sonic, resistivity and temperature information are used in an integrated manner in order to identify the organic richness of the shally intervals allover the Albian - Aptian rock sequence in Negelah well located at ... -
Mycoflora and mycotoxins of sunflower(helianthus annuus l.) Seeds in egypt 1. Sugar fungi and natural occurrence of mycotoxins
( Qatar University , 1986 , Article)Eighteen genera and sixty-three species, in addition to three varieties were isolated from thirty six samples of sunflower seeds collected from different places in Egypt. Aspergillus and Penicillium followed by Rhizopus ... -
Production Of Extracellular Enzymes By Some Soil Yeasts
( Qatar University , 1997 , Article)This study investigated the ability of soil yeasts, Geotrichum candidum, Geotrichum capitatum and Williopsis californica to produce extracellular enzymes (amylase, cellulase and protease) in vitro compared with that of a ... -
chelating behaviour of 1,1,3,3-propanetetrasalisoyl tetracarbohydrazone
( Qatar University , 1994 , Article)The reaction of 1,1,3,3-propanetetrasalisoyltetracarbohydrazone (HgPTSTCH) with some metal ions in ethanol-aqueous medium has been studied. The isolated complexes were formulated as [Cu4(PTSTCH)8H2O] 4H2O, [Co4(PTSTCH) ... -
The electrical and optical properties of poly (4-ethylidene-l, 3-cyclopentylene vinylene)
( Qatar University , 1989 , Article)The intrinsic viscosity, electrical conductivity and IR absorbance were measured for the sample of poly (4—ethylidene—1, 3—cyclopentylene vinylene). The sample is strongly oxidized in air. Under vacuum the activation energy ... -
Approximate Solution For A Problem Of Propagation Of Elastic-Plastic Wave In The Half-Space
( Qatar University , 1984 , Article)In this paper, we consider a half-space occupying an elastic-plastic medium. Treatments were carried out under the assumption of perpendicular load, on boundary which propagates with a constant speed D. The assumption ... -
Mineral analysis of soil, euphorbia hirta l. And mycoflora from the industrial Yanbu City, Saudi Arabia
( Qatar University , 1995 , Article)Soil and Euphorbia hirta L. samples were collected from five localities from the industrial Yanbu city Saudi Arabia, and analysed for their metal and fungal flora. Soil type is sandy, alkaline and contained low percentage ... -
The inhibitive action of sodium castor sulphonate Towards the corrosion of aluminium in Hydrochloric acid
( Qatar University , 1993 , Article)The dissolution of aluminium in 2M HC1 solution in presence of sodium castor sulphonate (SCS) has been studied using thermometric and hydrogen evolution methods. The results showed that the additive retards the dissolution ... -
Impulse Breakdown Characteristics In Air In The Presence Of A Local Spark
( Qatar University , 1996 , Article)In this paper, we study the flashover phenomena in air gaps containing floating metallic objects. The effect of a local spark on the impulse breakdown characteristics of a model gap arrangement which simulating a gas ... -
Earth Resistivity And Self-Potential Study On The Area East Of Sohag City And Their Groundwater Implications
( Qatar University , 1993 , Article)Nineteen field vertical electrical soundings have been made in the area east of Sohag to provide hydrogeologic information for groundwater exploration. These sounding are interpreted using programs for the automatic ...
