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السجلات المعروضة 11 -- 20 من 39
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 ...
Global And Ultravoilet Radiation Over Kuwait
(
Qatar University
, 1999 , Article)
The data of six spectral bands of solar radiation over Kuwait were measured locally, during the period of time starting May 1, 1995 until February 5,1998.
Near ultraviolet spectral band (315-380) nm, shows very week ...
Neutron Diffraction And Mossbauer Effect Study On A Mixed Rare Earth Garnet
(
Qatar University
, 1983 , Article)
A powder sample of Y^YbFesO,; was prepared using the ceramic technique. X-ray diffraction pattern showed a single phase of the garnet type structure with a lattice constant 12.323 A". Specific heat for this composition was ...
Calculation Of Mass Yield Distributions In Fission Induced By High Energy Protons
(
Qatar University
, 1991 , Article)
An analytical expression is obtained for the mass-yield distribution in fission induced by high-energy protons, using a two-step model. In the first step, the incident proton penetrates the target nucleus, knocking out ...
Studies On The Decay Of 241Am
(
Qatar University
, 1989 , Article)
The gamma-spectrum of '"Np following the <X -decay of "'Am has been studied using hyper pure Ge-detector and Ge-NaI(Tl) coincidence spectrometer. Some recently reported weak gamma transitions are confirmed, besides two ...
Diffuse Phase Transition In Non-Stoichiometric LiRbSO4 Crystals
(
Qatar University
, 1992 , Article)
The influence of changing the ratio of Li2S04 on the structure transition of (RbxLi1-x)2S04 , LRS crystals, where x ranged from 0.1 to 0. 7, was studied by thermal analysis techniques in the temperature range 300 - 600 K. ...
Effects of the electric field and gamma Radiation on the optical properties of Modified low density polyethylene
(
Qatar University
, 1997 , Article)
The effect of electric field and gamma radiation on the optical properties of low density polyethylene LDPE grade CD 0230 have been studied. The samples were irradiated at gamma doses of 0-100 Mrad and varying electric ...
Study of the Hydration of Blast-Furnace Slag Cement and Portland Cement by Mossbauer Spectroscopy
(
Qatar University
, 1982 , Article)
Mossbauer spectra have been measured for the hydrated blast-furnace slag cement and Portland cement pastes at different times of hydration of 1. 3. 7. 28 and 90 days. The spectra showed the existence of iron atoms, Fe3 (T) ...
Optical Properties Of Oxidated Blown Asphalt Films
(
Qatar University
, 1996 , Article)
Films of purified blown asphalt of high grades of oil and the accompanied adulterated particles derived from its manufacturing process, that is, it was purified 98%. This study focused on optical properties in the wavelength ...
Variation Of The Electrical Properties Of Manganese Thin Films With Deposition Conditions
(
Qatar University
, 1989 , Article)
The behaviour of the electrical properties of manganese thin films of different thickness (240 - 1500 A) evaporated under different deposition conditions was studied. The effect of the rate of evaporation (1-7 A/s), the ...