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Now showing items 21-30 of 39
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+. ...
The effect of doping crystals of tgs with some di- and trivalent ions on its: (ii) polarization and piezoelectricity
(
Qatar University
, 1987 , Article)
The polarization, coercive field,piezoelectricity and electromechanical coupling for pure and doped single crystals of TGS arp investigated in the temperature range 77-325 K. The influence of the divalent ions Ni 2+, Cu2 ...
استخدام ظاهرة الرنين النووي (ظاهرة موسباور) في مجمال دراسة فخار الآثار القديمة
(
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 ...
Impulse Breakdown Characteristics In Air In The Presence Of A Local Spark
(
Qatar University
, 1996 , Article)
In this paper, we study the flashover phenomena in air gaps containing floating metallic objects. The effect of a local spark on the impulse breakdown characteristics of a model gap arrangement which simulating a gas ...
On Using the One-Exposure Method for Stress Measurements by X-Rays in Technology and Scientific Research
(
Qatar University
, 1982 , Article)
The paper discusses the connection between macroscopic internal stresses and the technological character of technical materials. The basic theoretical relations which are used with X-Ray tensiometry of macroscopic internal ...
A Study Of Atmospheric Transparency Over Qena In Upper Egypt
(
Qatar University
, 1995 , Article)
Atmospheric transparency over Qena/Egypt has been studied for direct solar radiation values . which were calculated from global and diffuse solar radiation measurements . The mean monthly of the instantaneously transparency ...
The effect of doping crystals of tgs with some di- and trivalent ions on its: (i) dielectric constant and a.c. Conductivity
(
Qatar University
, 1987 , Article)
The problem of the existence of a new ferroelectric phase transition at low temperatures in TGS crystals is discussed. The influence of some inorganic divalent and trivalent ions presented in the lattice of TGS on dielectric ...
Integration technique for neutron source standardization inside A cylindrical water tank
(
Qatar University
, 1993 , Article)
This work deals with the evaluation of neutron irradiation facility. Two (Pu-Be) sources and two (Ra-Be) sources are used. Integration technique by a BF3 detector for neutron source standardization is used. The necessary ...
Thermoluminescence (TL) Response Of Gamma-Irradiated Raw Material And The Influence Of Doping By Different Activators
(
Qatar University
, 1994 , Article)
Thermoluminescence of raw materials has been frequently employed to determine the exposure dose as well as effective energy of gamma radiation. In this work, thermoluminescence (TL) properties of cement clinker (C) and its ...