The analytical relationship that gives the neutron beam flux does
not take into account the probability of decay. In this research, we
concluded the analytical relationship of the probability non decay
of free neutron during the passage of the sam
ple to be analyzed by
NAA. And the conclusion of the analytical relationship to the
probability of non-capture of the free neutron during the its passage
of the sample to be analyzed by NAA in a simpler method than the
previous conclusion. We conducted an application study to
investigate the effect of the probability non decay of free
neutrons, that flowing through sample, On the flux of transient
neutron beam, for neutron beam with various large thickness
samples and for different energies of neutrons. The effect of
probability of neutron decay on neutron beam flux could not be
negligible for all the energies which are bigger than of
thermal.
Biomimetic oxidations at active sites of iron proteins involve peroxides, especially
hydrogen peroxide which is a strong and very convenient reagent since it is inexpensive
and does not release any toxic by-products. In many cases however, mother N
ature uses
molecular dioxygen to carry out major oxidation reactions in particularly attractive
conditions. The biomimetic interest of iron complexes in the tris(2-pyridylmethyl)amine
series TPA is no longer to demonstrate. We prepared various α-substituted TPA-based
ligands with the idea to modulate the electronic properties at the metal centre. We then
checked the reactivity of a one example of complexes towards molecular dioxygen.
This paper aims to study the distribution of free nitrogen atoms through surface of α – Fe sample using the numerical solution for linear differential equation by means of Crank – Nicolson method at a temperature range ( 550 to 950 0C) and time inter
val (0 – 8)h where the nitrogen diffusion constant is at 850 0C and 8h.
Under the supposed condition this study has illustrated that the diffusion depth of nitrogen atoms from surface towards inners reaches to ̴ 1.2mm, i.e., determining the layer thickness of the formed nitride compounds which gives the surface layer of α – Fe high resistance against corrosion processes resulting from surrounded environment.
We study the concentration of the defects created by the light from the measurement of the Fermi state displacement deduced from the conductivity variation with the temperature for samples of hydrogenated amorphous silicon (a-Si:H) deposited by Plasm
a Enhanced Chemical Vapor Deposition (PECVD). This study demonstrated that the value of the activation energy of the samples in the case of As-depos. indicate that the samples before the warm-up (as are upon receipt of these samples from the laboratory) partially exposed to light during the process of transportation and storage. Been explained the effect of light on this samples that it was returning to cut weak silicon bonds and then the creation of new dangling bonds. We also found that the samples containing less hydrogen are the most affected by the light which indicates the important role of hydrogen in the satisfaction of defects. Also found that samples which contain germanium by less dopant are most affected by light.
In this study the researcher evaluates the role of mutual funds activation at
Damascus Stock Exchange and hence national economy. So that mutual funds could
achieve investment role more efficient and less risk. But if there are loose in the
contro
l, governance and transparency over mutual funds, it could jeopardize small
financial institutions to termination, could be transferred to money collectors, and
interest conflicts could be exaggerated. Therefore, Damascus Stock Exchange should
strength its control and issues the necessary rules concerning transparency,
governance, control, and interest conflicts.
Researcher accomplishes this research through theoretical studies of accounting and
finance literature concerning mutual funds, and by preparing questioner, and
analyzing it through well known statistical methods. We have received variety of
conclusions the most important are
Establishing mutual funds at Syria could activate Damascus Stock Exchange and as
a result activate national economy
It is very important for Damascus Stock Exchange to issue the necessary rules
concerning transparency, governance, trade, management fees, interest conflicts,
and so on.
The hydrodynamic activation of NaOCL plays an important role in increasing
its disinfectant efficacy.
The aim of this study was to evaluate the efficacy of a 5.25% sodium hypochlorite Activated by
EndoActivator device in reducing the bacterial load in the infected root canal.
since teeth whitening is very important procedure in dental office. the effect
of peroxides on enamel tissue is of great interest in research. The aim of this in vitro study was to perform
a qualitative analysis of the human enamel microhardness af
ter the application of high concentration of
hydrogen peroxide (38%)with and without light activation, using Vickers microhardness tests.
The heterocyclization of unsaturated nitriles and ethyne catalyzed by
cyclopentadienyl - ١،٥ - cis, cis-cyclooctadiene-cobalt (I) and promoted by light
has been studied in toluene as solvent.
Acrylonitrile and substituted acrylonitriles gave satis
fying results
interesting for the preparation of ٢-vinylpyridines.
No reaction was observed using fumaronitrile, maleonitrile and
allycyanides.
(E)/(Z)-ratio of reactants and products seems not to be influenced within the
reaction.
A openchained Bispyridyl ether has been synthesized using ٢،٢- bis
[٢-cyanoethoxy]- diethylether as an intermediate from the reaction of
acrylonitrile with Diethylene glycol
The heterocyclization of ٢،٢- bis [٢-cyanoethoxy]- diethylether and
acet
ylene catalyzed by cyclopentadienyl-١،٥-cis,cis-cyclooctadiene-cobalt(I)
and light has been studied in toluene as solvent.
The Nitrile gave results of interest in the preparation of the openchained
bispyridyl ether compound ٢,٢-bis [٢-pyridylethoxy]-deithylether.
