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Browsing Qatar University Science Journal - [From 1981 TO 2007] by Publication Date 
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    Browsing Qatar University Science Journal - [From 1981 TO 2007] by Publication Date

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        Primary Productivity of Lake Manzalah, Egypt, using C14 technique 

        Ibrahim, M. A. [محمد امين ابراهيم]; El-Reheim, H. A. ( Qatar University , 1981 , Article)
        The hydrographical and chemical conditions of Lake Manzalah, Egypt, are influenced by the surging in of saline water from the Mediterranean sea and are by no means stable. The average of the parameters studied during the ...
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        Relation between Quasi-normed Ideals of Entropy Numbers and of Approximation Numbers 

        El Shobaky, E. [انتصارات محمد حسن الشبكي] ( Qatar University , 1981 , Article)
        Let en(T) and an(T) be the entropy numbers and approximation numbers of operator T between Banach spaces, respectively. Let ?p be the operator ideal defined by Sp:^TeL;{en(T)^lp}, and Sp be the operator ideal defined ...
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        Mossbauer Effect Study of the Hyper fine Structure of the Different Phases of Iron in the Portland Cement Produced in Qatar 

        Eissa, N. A. [نبيل عيسى]; Sallam, H. A.; Al-Houty, L.; Al-Mauraikhy, M. ( Qatar University , 1981 , Article)
        Various samples of the raw materials used in the manufacture of Portland cement in Qatar, the clinker produced and the cement itself were studied by using Mossbauer Effect and X-ray diffraction analysis in order to investigate ...
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        Study of Magnetic Properties and Lattice Dynamics of the Cdx Co1-x Ferrite System by MossbauerEffect 

        Eissa, N. A. [نبيل عيسى]; Fayek, M. K.; Hassan, M. Y.; Salah, S. H.; Sallam, H. A. ( 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 ...
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        Dehydration of Ethanol over HF-treated Al2 O3 using the GC-column as Chemical Reactor 

        Ebeid, Fikry M. [فكري عبيد]; Alkaaby, Sherifa S. ( Qatar University , 1981 , Article)
        The effect of treating •y-alumina with hydrofluoric acid on the dehydration reaction of ethanol was investigated at 325°C. The gas chromatographic column was used as a chemical reactor. The rate of formation of ethylene ...
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        Translation - invariant Positive-definite Generalized Kernels of Infinite Number of Variables 

        Gali, I. M. [ابراهيم غالي]; El-Bab, A. S. Okb; El-Desouky, A. T. ( Qatar University , 1981 , Article)
        In the theory of spectral analysis of positive-definite j<.ernels, there exist well-developed methods based on the ideas of Krein connected with the construction of a Hilbert space by means of a kernel [ 1, 11]. In the ...
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        The Neurosecretory Cells and Neurosecretions in the Developmental Stages of the Cotton Leafworm -Spodoptera Littoralis (B) 

        Banhawy, M. A. [محمود احمد البنهاوي]; Anwar, Ibrahim M. ( Qatar University , 1981 , Article)
        In 1955 Nayar described two types of neurosecretory cells in lphita limbata (A- and B-types) [1]. Later, Johannson [2] classified these cells into four categories: A, B, C and D, which he regarded as motor neurones of ...
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        Overhead Allocation: a Goal Programming Approach 

        Badran, Yehia [يحيى بدران] ( Qatar University , 1981 , Article)
        Overhead is an incurred cost which is matched against cost objects via an intervening base of allocation. The problem of overhead allocation is to come up with a cost allocation procedure which is objective, applies, ...
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        استخدام ظاهرة الرنين النووي (ظاهرة موسباور) في مجمال دراسة فخار الآثار القديمة 

        Eissa, N. A. [نبيل عيسى] ( Qatar University , 1981 , Article)
        أصبح استخدام الطرق العلمية الموضوعية لازماً لتأكيد النتائج الذاتية التي يتوصل إليها علماء الآثار، وطريقة طيف موسباور المستخدمة في البحث الحالي تعتبر أحدث الطرق العلمية الفيزيائية التي استخدمت في مجال دراسة الفخار الذي عثرت ...
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        On the Propagation of Elastic-plastic Wave in the Half Space 

        El Dewik, Fawzi-Shaban [فوزي شعبان الدويك] ( Qatar University , 1981 , Article)
        The problem of the propagation of the elastic-plastic wave in the half-space occupied by and elastic-plastic medium has been studied. Treatments were carried out under the Assumption of perpendicular load, on the boundary, ...
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        p,q Ideal of Operators in Banach Spaces 

        El Shobaky, E. [انتصارات محمد حسن الشبكي] ( Qatar University , 1981 , Article)
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        Mechanism of Dehydration of Ethanol over Alumina 

        Ebeid, Fikry M. [فكري عبيد] ( Qatar University , 1981 , Article)
        The dehydration reaction of ethanol to ether and ethylene was kinetically investigated in a flow system using •y-alumina. Pyridine was found to inhibit the formation of ethylene and ether. The rate of ethylene formation ...
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        Petrophysical Studies on Samples from Eocene Exposures West Cairo-Egypt 

        Hassan, N. M. [ناصر محمد حسن]; Sherif, Omar H.; Ragab, Mohamed A. ( Qatar University , 1981 , Article)
        The present work deals with petrophysical and petrochemical studies on 58 limestone samples of Eocene age in two localities west of Cairo (Sakkara and Giza Pyramids Plateau). The determined petrophysical properties are: ...
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        Mossbauer Effect Study of Libyan Desert Silica Glass 

        Sallam, H. A. [هناء جمد الغني سلام]; Eissa, N. A. [نبيل عيسى] ( Qatar University , 1981 , Article)
        The Mossbauer effect and X-ray fluorescence techniques are applied to study the Libyan Desert Silica Glass. The X-ray flourescence proved the existence of 13 elements in each sample of five glass types with differences in ...
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        Microfacies of the Upper Cretaceous-Lower Tertiary Rocks of Um Rijam Area, South Jordan 

        Youssef, M. I. [مراد يوسف] ( Qatar University , 1982 , Article)
        This paper deals, for the first time, with the microfacies of the Upper Cretaceous - Lower Tertiary rocks of south Jordan. Twenty three microfacies associations are recognized, described, discussed and illustrated. This ...
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        The Complexation of Lanthanides by Azo-B-Diketones Stability Constants 

        Abdel Moez, M. S.; El-Anani, G. A.; Ramadan, A. A.; El-Shetary, B. A.; عبد المعز, محمد سمير; العناني, جابر; رمضان, عاطف; الشطيري, بشير... more authors ... less authors ( Qatar University , 1982 , Article)
        The stability constants of the complexes between the trivalent lanthanide series of cations and series of azo-B-diketone ligands are reported. The measurements were conducted at 30°C and zero ionic strength (free KN03), ...
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        Interpretation of Gravity Anomalies Due to Lens-Shaped Structures 

        El Awady, M. M. [محمد محمد العوضي] ( Qatar University , 1982 , Article)
        One of the interesting exploration problems in hydrogcology is finding subsurface geological lens-shaped structures. This paper deals with the interpretation of such structures using their gravity anomalies. A master curve ...
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        Neutron Diffraction and Mossbauer Effect Study of a Cobalt Substituted Zinc Ferrite 

        Fayek, M. K. [محمد خورشيد فائق] ( Qatar University , 1982 , Article)
        The mixed cubic ferrite Zno.g5 €00.15 Fez 04 is studied by neutron diffraction and Mossbauer effect techniques at the temperature range 4.2 - 293 °K. The obtained spectra by both methods at low temperature show a long range ...
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        Mossbauer Effect Study of the Cations Distribution and its Influence on the Electric Field Gradient of the Cdx Co1-x Ferrite System 

        Eissa, N. A. [نبيل عيسى]; Sallam, H.A.; Salah, S.H.; Goma, S.S. ( Qatar University , 1982 , Article)
        In the ferrite system Cd,Co,_x Fe; 04 (X=0.0, O.I, 0.2, ....... , 1.0). it was found that the introduction of Co2'1' decrease the EFG at the octahedral B-site. This was attributed to the distributions of the different ...
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        Insect Pests Attacking Vegetable Crops in the State of Qatar (Abstract) 

        Eissa, I. S. [ابراهيم سليمان عيسى] ( Qatar University , 1982 , Article)
        The area cultivated with vegetable crops in the State of Qatar reached, during 1979 and 1980, a percentage of about 42.9 % of the total cultivated (or suitable to be cultivated) area. Vegetable crops selected for collecting ...

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