Browsing QU Ceased Journals by Title
Now showing items 978-997 of 2240
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Sponges (Porifera) In Submarine Caves
( Qatar University , 1999 , Article)Sponges (phylum Porifera) have the most simple and probably the most ancient body plan of the multicellular animals. They are, however, very successful in most benthic ecosystems. They are dominant in submarine caves, where ... -
Sponges in Qatari waters A new source of marine natural products for biological applications
( Qatar University , 1999 , Article)Sponges are the most primitive multicellular organisms belonging to Animalia kingdom. They lack symetry and do not have differentiated tissues or organs. However, as a consequence of this primitive organization it is very ... -
Spore Colour Index And Organic Thermal Maturation Studies On The Pliocene Sediments Of The El Qara-2 Borehole, Nile Delta Area, Egypt
( Qatar University , 1996 , Article)Eight conventional core samples from the El Qara-2 well, situated in north central Nile Delta area, Egypt, have been palynologicaly investigated for determining the thermal maturity of the Pliocene Abu Madi and Kafr El ... -
Spreadsheet Class Scheduling For The College Of Engineering, University Of Qatar
( Qatar University , 1998 , Article)The process of preparing class schedules is a lengthy and painstaking experience, especially when the requirements on the system approach saturation capacity. Instructors have to be assigned to places, with different ... -
A Spreadsheet Teaching Tool For Analysis Of Pipe Networks
( Qatar University , 1997 , Article)Spreadsheets are used widely in engineering to perform several analysis and design calculations. They are also very attractive as educational tools due to their flexibility and efficiency. This paper demonstrates the use ... -
Stability Analysis Of Digital Pd Control Applied To Flexible Systems
( Qatar University , 2002 , Article)The work shows that the sampling in a digital PD controller of a flexible system may cause instability, while the continuous PD control system is stable. A procedure is introduced to define the stability regions analytically ... -
Stability Constants of Lanthanide Complexes with some Structurally Related Organic Ligands
( Qatar University , 1982 , Article)The stability constants of the complexes formed between trivalent lanthanide ions and related carboxyphenylhydrazo-B-diketones ligands are repoted, at 30 °C and at constant ionic strength (0.1 KN03), in 75 % dioxane-water. ... -
Stability of Logistic Autoregressive Model
( Qatar University , 2007 , Article)In this paper we propose a Logistic Autoregressive Model, which is a special case of polynomial Autoregressive Model. The aim of this paper is to study and find the stability conditions of the above model by using a dynamical ... -
Stability Of Square Interval Matrices For Discrete Time Systems
( Qatar University , 2001 , Article)New sufficient conditions for the Schur stability of interval matrices are provided. Moreover, a time saving version of a necessary and sufficient condition for the Schur stability of a class of interval matrices is ... -
Stable isotopic composition, stoicometry and origin of Siliceous dolomite of naqb siwa member Bahariya oasis, Egypt
( Qatar University , 1994 , Article)The Lower Campanian Naqb Siwa member exposed near Bahariya Oasis, Egypt, is a shoal ing-upward dolomite sequence that hosts chert nodules and lenses and cavity fillings of quartz and calcite. Dolomite is dominantly replacive, ... -
The Status Of Qatar's Fisheries During 1980-1990
( Qatar University , 1992 , Article)The present study was conducted to overview the status of Qatar's fisheries during 1980-1990, using the fishery statistics data. issued annually by the Department of Fisheries, Ministry of Municipal Affairs & Agriculture, ... -
Stereochemistry of some high coordination compounds of dioxouranium(VI) With thiosemicarbazones
( Qatar University , 1994 , Article)The UO2 ion is peculiar in its coordination behaviour, because of its inherent capacity of forming compounds with higher coordination number. In the present work we describe the synthesis of a series of eight, nine and ten ... -
Stochastic Classes Of Life Distributions
( Qatar University , 1990 , Article)The concept of stochastic ordering of random variables is used to characterize the behaviour of the life length variables. This leads to some new classes of ageing namely, the stochastic classes of life distributions. The ... -
Strain Broadening of E.P.R. Linewidths in Fe/Mgo Single Crystals and Powders
( Qatar University , 2004 , Article)The E.P.R. linewidth of the M= + 1/2 <-» -1/2 transition of Fe3+ spectrum of Fe/MgO single crystals and powders have been measured at 9 GHz before and after annealing. The nominal iron concentrations ranged from 310 to ... -
Stratigraphy and paleobathymetry of upper cretaceous-lower tertiary exposures in beris-doush area, kharga oasis, western desert, Egypt.
( Qatar University , 1990 , Article)The detailed study of the Upper Cretaceous-Lower Tertiary succession exposed in Beris-Doush area enabled the subdivision of this succession into a number of rock units well known in the Nile Valley facies area in Egypt. ... -
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 ... -
Strong and Weak n-Homogeneous Spaces
( Qatar University , 2004 , Article)In this paper we introduce new types of n-homogeneity, we call them n-homogeneous of type 2 and type 3, denoted by nH2, nH3 respectively. We show that every 3H3-space is bihomogeneous space. Also, every finite nH3-space ... -
Structural Design Of Arch Profile And Depth — A Computer-Aided Study
( Qatar University , 1991 , Article)This paper presents a comparative study of some of the best known and widely used arch profiles, in an endeavour to investigating their structural performance and to determining optimum arch form and depth. Arch profiles ... -
Structural Elements And Formation Parameters For Some Lower Cretaceous Sequences In The Western Desert, Egypt
( Qatar University , 1987 , Article)The Lower Cretaceous sequences in the northern part of the Western Desert has been penetrated by many of drilled bore—holes adopted by different oil companies. It was encountered at depths ranging from 1200 to 3500 m. The ... -
Structure Mixture Response Of Buildings Due To Simulated Earthquake Loading
( Qatar University , 2002 , Article)This paper presents two case studies to evaluate the performance of the structure mixture theory in the earthquake response analysis of buildings. In the first case study, the actual earthquake responses of the two-story ...
