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Now showing items 51-60 of 114
Tectonic Setting and Petrogenetic Evolution of Wadi Erier Rocks, South Eastern Desert, Egypt
(
Qatar University
, 2003 , Article)
A combination of geologic, petrographic and chemical criteria is used to classify the Erier basement rocks into three suites namely, the metagabbro-diorite (MGD) suite, the tonalite-granodiorite (TG) suite and the ...
Comparative Study of 11 Honey Samples Sold in Riyadh Saudi Arabia
(
Qatar University
, 2006 , Article)
11 honey various samples commercially available in Saudi Arabia, were subjected to chemical, toxicological and bacteriological tests. The samples were checked for As and CN, presence of pollens, and for bacteria contamination. ...
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 ...
Nitrogen Transformations As Affected By Some Factors at Cultivated Soils In Saudi Arabia
(
Qatar University
, 2000 , Article)
The influence of serial concentration of salts (0.5, 1.0 and 1.5%), application of organic matter (0.5, 1.0 and 1.5% of wheat straw) and varying soil moisture content (50, 70 and 90%) on nitrification in sandy loam soil ...
Nitrogen Transformations as affected by some factors at cultivated soils in Saudi Arabia
(
Qatar University
, 2001 , Article)
The influence of serial concentration of salts (0.5, 1.0 and 1.5%), application of organic matter (0.5, 1.0 and 1.5% of wheat strat) and varying soil moisture content 50, 70 and 90%) on nitrification in sandy loam soil was ...
Generation of Sets of Sequences lsomorphic to Walsh Sequences
(
Qatar University
, 2005 , Article)
Walsh sequences of the order 2k, k positive integer, form an additive group generated by Rademacher sequences set of ft-order. Except the zero sequence, Walsh sequences form an orthogonal set. Our present work allows us ...
Investigation of Magnesium (II), Calcium (II) and Barium (II) Complexes in Aqueous Solution
(
Qatar University
, 2005 , Article)
The ionic association constants, K6, of Mg, Ca and Ba metal ions with succinate, malate and tartrate ligands were conduct metrically determined in water at 25-40°C. The conductometric data were analysed by the Shedlovsky ...
The Flora of The State of Qatar: Its History and Present-Day Status
(
Qatar University
, 2005 , Article)
The history of botanical exploration in the State of Qatar is of recent origin. Various collections culminated in 2 major Floras for the State of Qatar in 1981 and 1983. Since then, further collections and focus on several ...
p-cds/n-Si Anisotype Heterojunction solar cells wih Efficiency of 6.4%
(
Qatar University
, 2005 , Article)
In the present paper, p-CdS/n-Si heterojunction solar cells are prepared for the first time by the spray pyrolysis technique. Using such low-cost method, cells with 6.4'/o AM1 conversion efficiency ina O.ZZ fill factor ...
The Optical and Electrical Properties of Low Density Polyethylene Films in CuSo4 Solution
(
Qatar University
, 2005 , Article)
The optical and electrical properties of pure and treated low density polyethylene (LDpE) were investigated. These measurements have been carried out at various times of immersion for LDPE films in 10% solution of CuSO+. ...