Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 561-580 of 770
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Stratigraphy And Petrology Of The Eocene Rocks At Maghagha (East And West), Nile Valley, Egypt
( Qatar University , 1985 , Article)Combined paleontological and petrological studies on the Eocene rocks at Maghagha revealed that the succession belongs to one biostratigraphic zone; the Numrnulites gizehensis gizehensis zone. Nummulites striatus was ... -
Some Adsorption Characteristics of Sodium decyl and dodecyl Sulphates on the surface of Emulsifier-free Polymer Latex Particles
( Qatar University , 1997 , Article)The adsorption characteristics of sodium decyl and dodecyl sulphates on polystyrene latex particles have been investigated. The study involves the addition of known amounts of the surfactant to an emulsifier-free latex, ... -
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 ... -
Mycoflora and mycotoxins of peanut (arachis hypogaea l.) Seeds in egypt. II - mycotoxin production by thermophilic or thermotolerant fungi
( Qatar University , 1987 , Article)Twelve species and one variety which belong to 6 genera were identified from 40 peanut seed samples using a dilution—plate method on 1% glucose—Czapek's medium at 4S°C. Aspergillus (6 species and 1 variety) followed by ... -
Modelling and simulation of flexible assembly systems A petri net approach
( Qatar University , 1995 , Article)This paper presents an approach towards constructing a class of Placc/TYansition nets for modelling, simulation and control of processes occurring in the Flexible Assembly Systems. Its objective lies in the formal statement ... -
Heat Storage In The Eastern Mediterranean
( Qatar University , 1993 , Article)Results of the monthly climatological fields of heat storage for the Eastern Mediterranean are presented. The zonal annual trend of monthly mean heat storage in the Levantine, Aegean and Ionian Seas are shown as well as ... -
Heavy minerals and provenance of the paleozoic suffi formation, Western desert, iraq.
( Qatar University , 1996 , Article)Heavy minerals analyses were carried out on 10 samples from the clastic Suffi Formation (the Ordovician-Carboniferous unit in the western Iraqi desert). The suite of minerals consists mainly of opaque minerals including ... -
Influence Of Surface Finish Parameters On Corrosion Of Zinc
( Qatar University , 1989 , Article)The effect of surface parameters on corrosion behaviour of pure zinc in sodium sulphate solution was investigated. Surface parameters were determined using a Talysurf surface analyzer, and corrosion testing was performed ... -
Mineralogy Of The Marrat Clay Deposits, Riyadh Region, Central Saudi Arabia
( Qatar University , 1989 , Article)Clays in the Marrat Formation, which crop out 200 km west of Riyadh, Saudi Arabia, are dominantly composed of brownish red to dark red mudstones and shales. Marrat clays are chiefly composed of kaolinite and lesser amounts ... -
Regeneration of Transformed Forage Legume Plants by Agrobacterium rhizogenes R1601
( Qatar University , 2003 , Article)Transformed forage legume plants (alfalfa & clover) by genetic engineering bacteria Agrobacterium rhizogenes R1601,were regenerated directly from seedling plants after inoculating the wounded site formed by cutting the ... -
A critical analysis of "harvest index"
( Qatar University , 1993 , Article)The many ways in which harvest index ratio (HI) can be used are discussed. A selection of published values for HI are given. Attention is drawn to the confusion in calculating the HI such that some present methods of ... -
Histology And Development Of Argas (Argas) Hermanni (Ixodoidea: Argasidae) Salivary Glands
( Qatar University , 1993 , Article)The anatomy and histology of Argas (Argas) hermanni salivary glands were studied during nymphal and adult development. The paired salivary glands consist of 2 alveolar types. Type I alveoli consist of several cells forming ... -
Incidence and characterization of bacillus cereus isolated From egyptian foods.
( Qatar University , 1993 , Article)In this study, 178 strains of Bacillus cereus were isolated from different Egyptian foods. Isolation was performed, using MYP and PEMBA media and confirmed by staining and biochemical tests. B. cereus occurred in 98% of ... -
Performance Analysis of a Fileserver in an ATM Network
( Qatar University , 2004 , Article)ATM continues to gain acceptance as a unifying communications technology for traffic of both digital and analog origins. The main characteristic of an ATM network is its discrete time (slotted) operation and fixed-length ... -
Effect Of Daily Alcohol Injection Of Pregnant Rats On The Developing Embryos
( Qatar University , 1989 , Article)In the present investigation; three doses; 0.002 (group I), 0.004 (group II) and 0.006 (group III) ml/gm body weight of 25%ethanol were used. Continuous IP injection of alcohol from day 7 through day 15 caused a significant ... -
Effects of electric and magnetic fields on the energy levels of a hydrogenic impurity in GaAs/Gal-xAl x As heterjunction
( Qatar University , 1997 , Article)Variational method within the effective — mass approximation is used to calculate the shallow impurities states in GaAs / Gai_xAl^As heteroj unctions. Modified Fang-Howard wavefunction is used as the trial wavefunction. ... -
A 6th-order local approximation by a cubic curve
( Qatar University , 1997 , Article)We derive and present a MAPLE program for the construction of a parametric cubic polynomial curve which has sixth-order contract with a given smooth curve at a given point, thus providing a local sixth-order approximation ... -
Functional adaptations of fig trees (ficus carica, l.) In agroecosystems of the western mediterranean desert of Egypt.
( Qatar University , 1991 , Article)The ecophysiological characteristics of fig (Fi'cus carica, L.) trees, growing with maximum activity during the hot and dry summer, were studied in relation to growth, carbon partitioning, nutrient balance and water use. ... -
Feeding Behaviour and Food Selection of Dhab Uromastyx microlepis From Wild Vegetation
( Qatar University , 2001 , Article)The present study deals with the food selection and feeding behaviour of Uromastyx microlepis 'dhab' spiny tailed lizard during a period of one complete year inhabiting AL-Gassim desert area. Climatically the area can be ... -
Diagenesis of the middle eocene "nummulite bank" of The giza pyramids plateau, Egypt: petrologic and 18o/16o evidence
( Qatar University , 1994 , Article)The Middle Eocene "nummulite bank" of the Giza Pyramids Plateau has been extensively altered diagenetically. The result of a study involving petrography, cathodoluminescence, and 18O/160 and 13C/12C data, provide information ...
