Journal of Basrah Researches (Sciences)

Dielectric properties such as relative permittivity (dielectric constant) (ε′) and dielectric loss (ε") of (epoxy resin – barium titanate) composites behaviour as a function of barium titanate volume fractions (5, 10, 15, 20, 25, 30, 35, 40) vol.%, temperature in the range (30 - 110) ◦C and frequency in the range (120Hz - 2MHz), were investigated and given a qualitative explanation. The permittivity was found to increase with the increase of BaTiO3 filler content, and was high in the low frequency range, but diminishes as the frequency increases. The permittivity was found to increase with the increase of temperature up to the transition temperature (Tg). Ac. conductivity and impedance of the composites behaviours as function of frequency and temperature have also been investigated.

Optical properties of PVA-g-Ei thin film prepared by cast method have been studied in
spectral range of (200-900 nm) .The dispersion of the refractive index is discussed in term of
Wlemple - DiDomenico single oscillator model , many dispersion parameters such as single
oscillator energy (Eo ), dispersion energy ( Ed ), refractive index ( n(0) ), discussed using Miller’s rule
,the optical absorption at the fundamental absorption edge dielectric constant ( e¥ ) ,moment of the
dielectric constant optical spectrum( M-1 ,M-3 )and energy gap by Wimple-DiDomenico approximation
( WDD
g E )have been calculated,non linear optical susceptibility ( c (3) ) has been discussed , direct
energy gap by Tauc relation ( T
g E ), energy gap by absorption spectrum ( A
g E ) and Urbach energy of
the localized states (Eu ) were also calculated . Photoluminescence spectrum of investigated PVA-g-Ei
thin film has been recorded in spectral range of (500-700 nm) , photoluminescence quantum
yield(FPL) and the energy gap at the absorption peak ( PL
g E ) have been also determined .
Keywords: Organic Eosin-Y dye, polyvinyl alcohol, optical parameters, Photoluminescence.

Etching behavior of the CR-39 plastic track detector hve been studied. From bulk etch rate as
well as from track etch rate, the sensitive equilibrium of this detector in NaOH solutions is
examined in detail. A comparison of discrimination properties between NaOH and KOH is made .

In this study, the effects of heat treatments annealing ,hardening and tempering on the microstructure and hardness of Mn-Fe Alloy were investigated. The Mn-Fe alloy samples were annealed at 900◦C for 20 min then cooling inside furnace and hardened treatment at 900◦C for 20 min with cooling by water, oil, and salts solution. The specimens were subsequently tempered at temperatures of 100 oC, 290 oC, 350 oC and 500oC. The microstructures, and hardness properties of these samples were analyzed and compared with samples without treatment. The microscopic examinations showed that difference in grains size for samples before and after heat treatments. The result showed that tempering of Mn-Fe Alloy samples (0.3%C) significantly exhibited better hardness as compared with that of Mn-Fe alloy without treatments .

The lattice thermal conductivity of solid neon has been calculated over the temperaturesrange(0.5-10 K), at molar volume (13.4 cm3/mole) by using Awad model. Taking into account five types ofscattering mechanisms boundary, dislocation, point defects, isotopes and three phonon scattering. Good agreement with the experimental data achieved by using adjustable parameters, maximum conductivity value reached to (307 mW/cm.K) at (3.1 K).

In this paper we established some results on fixed point theorems for multi-valued mappings on a complete metric spaces by altering the distance between the points. We extend and generalized some well-known results in [2], [5], [6], [8] and [9].

In this study we calculate the expected mean squares for 4-way crossed balanced model with correlated data and notice the effect of the correlated data on F statistic. The expected mean of squares for this study is calculated using an approach based on some aspects of linear algebra

Because of using images widely in industrial process, it is important to protect the confidential image data from unauthorized access. The RC4 algorithm is selected. The proposed algorithm is used with wavelet transform. The main idea of this paper is to show how genetic algorithm works to give the optimal keys and the influence of each key in the increasing security, several experiments were given to prove that

Protective effects of Vit C against copper (Cu) toxicity have been examined in this study. The diagnosis of sub acute copper toxicity in laboratory mice was based on body weight gain, hematological and biochemical parameters and histopathology of liver and kidney . The experimental groups were a control group, mice treated with 4 mg/kg/day Cu (Cu group) , and mice treated with 4 mg/kg/day Cu plus 60 mg/kg /day Vit C (Cu+VitC group). The groups that were given Cu and Vit C intraperitoneally (ip) injection daily for four weeks. The results revealed significant decrease in body weight, hemoglobin, PCV, and RBCs count in Cu group, when compared with control and (Cu+VitC) group (P< 0.05). While WBCs count was significantly decreased in Cu group as compared with control. But (Cu + VitC) group was not statistical affect as compared with control group. The Cu group showed a significant increase in the levels of liver enzymes (ALT, AST). However, the Cu + Vit group showed less affected when compared with control group. Some histopathological changes were found in liver such as: infiltration of mononuclear cells at parenchymal tissues, degeneration and necrosis. The kidney of Cu intoxicated mice show sever acute damage in the glomerulus and proximal tubule, but the Cu + Vit group showed less pathological effect or normal liver and kidney tissues. In conclusion, sub acute copper administration caused liver and kidney damage, In addition, the treatment with Vit C after the administration of Cu reduced these lesions cause by Cu.

The present study is conducted to prepare Ibuprofen as polymeric prodrug to improve its important physiochemical properties, increasing water solubilityand decrease its side-effects. The product is characterize by using chemical and spectral methods .Then controlled release of Ibuprofen in from its polymer, in different phosphate buffers ( pH =8.5, 7.5 and 1).The result show the percentage release of Ibuprofen was high at basic pH.