Volume 16 Issue 4
Published: 2005-03-01
Contents
Article
Vibration of Two Coupled Linear Atomic Chains
Mekaiel A. Mossa
By method of difference equations an equation of motion have been calculated for two coupled linear chains with different atoms. Special cases are discussed and shows full agreement with the above...
Theoretical Model for Vanadium Doped Gallium Arsenide
Adnan M. Al-Sheikh
An orthorhombic strain model for V2+ in GaAs is presented in this work. Spin and effective Hamiltonians are derived for this model. A brief summary of the Jahn-Teller effects and random strains has...
Electrical Conduction in N-Hexane and Cyclo-Hexane Under the Influence of Uniform Electric Field
Haitham A. H. Al- Rawachy
Electrical conduction is observed in n-hexane and cyclo-hexane under the influence of uniform electric field which is produced by using plate-plate electrode geometry, this paper discusses the...
The Effective Atomic Number of Tissue Equivalent Materials
Sleeman Y. Sleeman, Khalid A. Jassim, Hayfa A. AL-Sawaf
The photoelectric cross-section for the tissue equivalent materials is in the first place dependent on the effective atomic number calculated on the basis of the exponent m, where m varies with...
Pressure Dependence of the Recoilless Fraction For 14.4keV Transition of Fe57 in Copper
Yahya N. Al-Jamal, Mumtaz M. Saleh, Adnan M. Al-Sheikh
The effect of pressur on the recoilless fraction (1) for the gamma-ray transition 14.4 keV emitted by Fe57 as an impurity in copper, using phonon frequency spectrum (pfs) analysis and Debye model...
Computation of Magnetic Field Dependence of the Dipolar Interaction Frequency of Oxygen Ion Center in CaF2 Crystal
Mekhaiel A. Mossa, Farouk A. Kasir
The work is concerned with the analyzing and studing the magnetic field dependence of the dipole- dipole interaction frequency for Oxygen ion center and its neighbours. Six groups of ions are...
Irreversibility of Current-Voltage Characteristics in Hydrocarbon Liquids.
Haitham A. H. Al- Rawachy
The I-V characteristics curves in this work have been seen irreversible , in purified saturated hydrocarbon liquids, in other words, the conduction Current curves in increasing direction does not...
Study of Electrical Properties of Some Amphibole Asbestose
Marwan Z. AL-Tai, Yasir A. AL-Jawady, Farouk A. Kasir
The dielectric constant Ke, electrical susceptibility and the voltage dependence of the electrical conductivity have been studied at room temperature for five specimens of amphibole asbestos,...
Determination of the Relative Directions of YBCO HTS thin Films with Respect to ZrO2 Single Crystal Substrate
Bassam M. Mustafa
In this research a method is proposed to determine the direction of the axis of YBCO HTS (high temperature superconductor ) thin films epitaxially grown on ZrO2 single crystals, with respect to...
Experimental Measurements of Molecular Force Parameter for Ar-CO2 Gas Mixture
Anwar M. AL-Faydhi, Asem A. Azooz
A binary mixture of Ar-CO2 with equal percentage was used in the thermal diffusion column. A set of different temperature and pressures were applied. Through the operation of separation, the...
Stopping Power of (1.895-7.4 MeV) 4He Ions in Composite Foils and Pure Elements
Nadwa I. Mahmood
This paper deals with the calculation of stopping power for solid media. A semi-empirical formula for stopping power used by other author for liquid media, was adjusted via the values of the...
Theoretical Study of Longitudinal Vibrations of Two Coupled Crystal Slabs Using Difference Equations Method
Mekhaiel A. Mossa
A Mathematical model describing lattice vibration is built for solid state lattice. The lattice considered consist of two crystal slabs with different atoms. Difference equation method formed the...
The Effect of Coil Geometry and Magnetic Circuit on the Flux Lines Trajectory of the Magnetic Lenses
Alaa A. H. Ahmed
The present research includes studying the effect of position and geometrical shape of the coil on magnetic flux lines trajectory also on the shape of the magnetic flux density distribution of a...
A Guide to Thermal Comfort Environment
Ahmad N. Al-Sabha
This paper presents a simple design procedure for dealing with the requirements for a comfortable thermal environment. From the expected activity level and clothing insulation of the people...
Separation of Chlorine Isotopes in Sodium Chloride Solution Using Thermal Diffusion Column
Hazim S. Hilal, Asem A. Azooz
The separation of chlorine isotopes in an aqueous solution is demonstrated the separation took place in thermal diffusion, column TDC. Separation action was proved using four types of measurements....
