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Now showing items 11-20 of 96
Phytochemical Studies On The Marine Algae Of Qatar, Arabian Gulf
(
Qatar University
, 1990 , Article)
The most dominant twenty three algal species representing the main three groups of benthic macroalgae, Chlorophyceae, Phaeophyceae and Rhodophyceae were collected from the coastal zones of the Qatar peninsula. These algae ...
Effect of plastic deformation on Corrosion of cadmium in 0.1 m sodium Sulphate solution
(
Qatar University
, 1993 , Article)
The present investigation was carried out to study the influence of prior plastic deformation and surface finish on the corrosion behaviour of pure cadmium in 0.1 M Na2SC>4 solution at 25° C. Cylindrical specimens were ...
The Inhibitive Action Of Sodium Soya Sulphonate Towards The Corrosion Of Aluminium In Hydrochloric Acid
(
Qatar University
, 1993 , Article)
The dissolution of aluminium in 2M hydrochloric acid in the presence of sodium soya sulphonate (SSS) as corrosion inhibitor has been studied using hydrogen evolution and thermometric methods. The two methods gave consistent ...
Pyrrolizidine alkaloids from heliotropium arbainense and h. Ovalifolium
(
Qatar University
, 1991 , Article)
Investigation of the pyrrolizidine alkaloids of Heliotropium arbainense resulted in the isolation and identification of heliotrine, europine and 7-angelylheliotrine. From H. ovalifolium three alkaloids were isolated: ...
Triaryl And Trialkyl Phosphites As Corrosion Inhibitors For Copper In Nitric Acid
(
Qatar University
, 1992 , Article)
Some triaryl and trialkyi phosphites were investigated as inhibitors of the corrosion of copper in nitric acid. The values of inhibitor efficiency from weight-loss measurements are in good agreement with those obtained ...
Microdetermination Of Some Organic Nitriles Using The Cyanide Ion Selective Electrode
(
Qatar University
, 1985 , Article)
The response characteristics of the solid state cyanide ion selective electrode toward some organic nitriles are investigated. In 10 M KOH solution, the electrode exhibits near Nemstian response over the range of 10~2 to ...
Study of Magnetic Properties and Lattice Dynamics of the Cdx Co1-x Ferrite System by MossbauerEffect
(
Qatar University
, 1981 , Article)
The magnetic properties and lattice dynamics of the spinel ferrite system Cdx Coi-x Fe^ 04 (x = 0.0, 0.1, . . . , and 1.) were studied in the temperature range between 78 to 800°K. The results showed that the samples with ...
Constituents of plants growing in Qatar xxiv phytochemical investigation of salvia aegyptiaca L.
(
Qatar University
, 1994 , Article)
The study of the flavonoids revealed the isolation and identification of luteolin, luteolin 7-O- glucoside, apigenin and apigenin 7-0 glucoside; their identity was proved by m.p., TLC, UV, IR and MS. Moreover, a coumarin ...
فعالية استخدام تقنية التشعب النصي في تدريس الكيمياء لطالبات السنة الأولى في المستوى الجامعي لكلية العلوم جامعة الملك عبد العزيز بجدة
(
Qatar University
, 2004 , Article)
يتناول البحث الحالي التحقق التجريبي من فعالية استخدام تقنية التشعب النصي Hypertext كخاصية من خواص معالجة النصوص لتكوين قاعدة بيانات يتم الربط بينها باستخدام مجموعة من الإحالات المرجعية cross-references تسهل على القارئ ...
Studies on Soil Cements: 1 - Role of Hydrated Lime and Dolomitic Monohydrate in Montmorillonite Stabilization
(
Qatar University
, 1982 , Article)
Montmorillonite clay was stabilized by either hydrated lime or the dolomitic monohydrate (Ca(OH)2. MgO) during suspension hydration at 25 and 60°C for 45 days. The distinct phases produced from the hydration of each ...