Basrah Journal of Science

In this paper, Born-Bethe approximation had been used to calculate the
generalized oscillator strength (GOS) and cross sections (CS’s) in terms of the diploe
oscillator strength (OS) for electron impact excitation of some atoms of inert gases
such as He, Ne, Ar. Since the cross section depend in its formula on the GOS, it
appears to us that the CS’s of He were more accurate than those of Ne & Ar atoms
when we made a comparison with the experimental data, since the GOS of He was
better in delicacy than Ne & Ar atoms .

In this paper the numerical study for incompressible power-low inelastic fluid is presented.
Physically, a continuity equation (mass conservation) and time-dependent conservation of
momentum equations are utilized to describe the motion of the fluid. Moreover, the flow problem
is solved under viscous inelastic assumptions, with a power-law inelastic model (????????????????).
Numerically, the study has been conducted based on the Galerkin finite element method (????????????????).
Attention is paid to the comparison between Newtonian results and shear-thinning inelastic.
The analysis of convergence under the parameters of power-low inelastic model and Reynolds
number is conducted. The Findings reveal that, there is a significant effect from the inelastic
parameters upon the the velocity temporal convergence-rates of velocity, while for pressue, the
change in convergence is modest.

e aim of this work is to study the ????-periodic solution of neutral type of stochastic
functional differential equations with infinite delay (NSFDEwID), where we used the Lyapunov’s
second method to show the boundedness of the solution ????(????) and the solution map ???????? to the above
equations. Contraction mapping principle and Banach fixed point theorem are used in this work.
We introduced an example in the end of this paper to illustrate the results of this work.

In this study, some ethylene glycol based polymers, namely poly(ethylene sebacate),
poly(diethylene sebacate), and poly(ethylene glycol)-sebacate copolymers having three different
molecular weights were prepared by condensation polymerization with sebacoyl chloride in very
good yields ranging from 81-88%. All polymers designed to be ended with hydroxyl groups. The
prepared polymers were characterized by infrared spectroscopy and molecular weight
determination using end-groups analysis method and both methods were confirmed the right
structures of the prepared polymers.
Biodegradation studies of all the prepared polymers were carried out by pressing the
polymer sample in the form of compact disc weighing 0.2 g and about 1 cm in diameter. In vitro
biodegradability studies was done using %weight loss of constant body temperature (37°C) in
human plasma pH=7.4, and determination of intrinsic viscosity of the solution of the degradable
polymers. The results revealed that the poly(diethylene sebacate) polymer needed more than four
months to reach only 21% loss while poly(ethylene sebacate) reached nearly 25% in the same
period of time. The same behavior was observed in the intrinsic viscosity study.
Under the same conditions, degradation of the polymers produced from condensation
polymerization of poly(ethylene glycol) having different molecular weight, i.e. (400, 10000,
20000) g/mole with sebacoyl chloride was also studied by determining of their degradable
solution intrinsic viscosities. The results obtained imply that the number of polymeric repeated
units has a great influence on the degradation of the polymer, the more repeated unit the less
degradation. This is considered as a good sign for these polymers to be used as a drug carrier in
controlled drug delivery systems as they increase residence time in the body.