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يتزايد الاهتمام يوما بعد يوم بتكنولوجيا تعدين المساحيق و من الأهمية بمكان التعرف على هذه التكنولوجيا و توطينها في سورية. و في هذا السياق , يقع هذا البحث.
Powder metallurgy is actually a growing field of great interest both scientifically and technologically. It is, therefore highly important to grant special interest to the development of scientific, basic and technological activities related to powder metallurgy in Syria.
References used
Powder metallurgy Technology , G. S. UPADHAYA , 2002
ASM Metals hand book VOL 07 (Powder metallurgy Technologies and applications ) , 1998
ASM Metals handbook VOL 09 (Metallography and Microstructutes)1992
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Mixtures of polycarboxylic acids and their salts with sodium
tripolyphosphate and sodium pyrophosphate have been investigated in the
presence of ammonium oxalate and sodium carbonate. Some of these mixtures
demonstrated good chelating power synerg
y and some mixures inhibited the
chelating power of the individual components from which the mixures
composed of. The chelating power synergy of some mixtures can be used for
enhancing the function of the builders and consequently decrease the weight of
the detergent meanwhile the inhibition of the chelating power in the other
mixtures can be used for precipitating their components in the treated water in
optimum conditions. It is worth to mention that the chelating powers of sodium
tripolyphsphate and citric acid increased as many as 3-88 times by changing
some experimental conditions.
In this research we present results of the studying and calculating the optically active
range depth for diffuse light reflected coating at change of the dispersiveness of pigment
grains used in coating and wavelength of incident electromagnetic ra
diation. This coating
consists of zinc oxide powder and organic material that acts as a binding film. The size of
zinc oxide powder grains were changed between 0.2 μm and 10 μm. In addition, the depths
of optically active range of diffuse light reflected coating were calculated when the
absorption coefficient of the pigment used in the ZnO/binder coating changed between
-1 0.1cm and -1 1000cm . The obtained results allow us optimization of the diffuse light
reflecting coatings thickness at preparation determined kinds of them.
Esthetic orthodontic archwires (fiber reinforced composite archwires) are
considered as the latest addition to orthodontic's world, and the load deflection rate is thought to be the
most important mechanical property of archwires which has strong e
ffect clinically, and this property is
affected by the cross section diameter and the material's type, for these reasons this study aims to
investigate the effect of the material's type and the cross section diameter of orthodontic archwires on the
load deflection rate of fiber reinforced composite(FRC) archwires with a diameter of 0.014 inch and
0.016 inch which are suitable for the leveling and alignment stage, and to compare these new materials
with Nickel titanium(NiTi) archwires .
Thick Films have been prepared by the chemical painting method from Tungsten Oxide nanopowdersas the source compound, which are prepared by milling in a high energy ball mill for variousspans of time (1-18h) on cleanedglasssubstratesunder limited the
rmal conditions. The temperature of the films have been changed from 25°C to 350°C. The films have been investigated for their sensing properties relating to 100 ppm ethanol vapor adsorption, using the (I–V) characteristics.The activation energy Ea for deposition films is deduced from the Arrhenius equation. The effect of the grain size and the thermal conditions on the sensing properties of the WO3thick films to ethanol vapor adsorption, as well as the correlations between The electrical conductivity of the WO3 thick films and the grain size of the material films are reported.The response time for films which have particle size about 70.54nm is defined at 300°C.
Aim: to compare the shaping ability of NiTi hand instruments with Stainless- steel instruments in preparation of curved root canal in extracted teeth.
Materials and Methods: a total of 24 of curved root canal were randomly divided into two groups. O
ne group was prepared using stainless steel instruments and the other prepared NiTi instruments. Curvatures pre-and post instrumentation were registered and compared. And straightening of the canals were determined by autocad analysis system.
Results: two systems were significantly changed the original canal curvature with no differences between both systems. However, the time required to finish preparation was significantly less with NiTi system.
Conclusion: under the conditions of this study, it can be concluded that two hand instrumentation system changed the original canal curvature, but the time consuming to finish the preparation was less with NiTi hand system.
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