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Gravitational Instability of a Radiating Gas Cloud with Variable streams
(
Qatar University
, 2001 , Article)
The self-gravitating instability of a radiating gas cloud possessing variable streams is investigated. The self-gravitating force is destabilizing according to restrictions, the radiation has a strong stabilizing influence ...
Ionic Conductivity and Ionic Jump Distance of Nuclear Detectors Group CR-39 and BM-355
(
Qatar University
, 2000 , Article)
Electric properties of two nuclear detectors (CR-39 and BM-355) have been investigated as a function of temperature differences. The conductivity appears to be ionic and it was increased with the temperature increase for ...
Experimental Investigation of the N-Pbs/P-Si Heterojunction Band Lineup with I-V and C-V Measurements
(
Qatar University
, 2005 , Article)
In this paper we present experimental investigation of band lineup of near ideal PbS/Si heterojunction diode using I-V and C-V measurements. The C-V measurements show that the fabricated diodes were abrupt type, and the ...
The Role of Improper Use of Artificial Insemination on Infertility and Abortion in Cows in Basrah Province, Iraq: Microbiological Study
(
Qatar University
, 2006 , Article)
A prospective study was performed to demonstrate the infectious causes and their mode of transmission in cases of infertility and abortion in cows. There were 434 artificially inseminated cows, of which 155 (35.7%) did not ...
Changes in Soluble Sugars and Proline in Seedlings of A local Wheat Cultivar (Doha) Due to the Salt Stress and Temperature
(
Qatar University
, 2006 , Article)
Germination of grains, and changes in the soluble sugars and proline due to salt stress under three temperatures in the germinating grains, of the local wheat cultivar (Doha) were studied. This cultivar proved resistant ...
A study of contamination of the northern Jordan valley agricultural fields by various metal ions using regression analysis.
(
Qatar University
, 2000 , Article)
Geochemical analysis were performed in lower subsurface soil samples of 10,20,30 and 40cm depth, collected from seven regions in the northern Jordan valley. Eighteen descriptors (variables) for each sample were used. Among ...
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 ...
Elliptic surfaces over a genus 1 curve with the pair (l3, l9) of singular fibers.
(
Qatar University
, 2000 , Article)
In this paper we give a classication of all minimal elliptic surfaces (n : E —> C, g(c) = 1) with a section and exactly the pair (L, L)) of singular fibers.
Some Macrobenthic Invertebrates in the Qatari Waters, Arabian Gulf
(
Qatar University
, 2005 , Article)
Macro-invertebrates from eleven stations along the Qatar Exclosive Economic Zone (EEZ), Arabian Gulf, were studied during December 1998. A total of 52 species were encountered from all stations. Crustaceans were the most ...
Isolation and Characterization of Pollulan Produced by a Local Isolate of Aureobasidium Pullulans
(
Qatar University
, 2000 , Article)
A local isolate of Aureobasidium pullulans was obtained from fig leaves surface. The isolate was identified as A. pullulans on the basis of appearance of polymorphism in the colonies, melanin pigment and pullulan production ...