In this issue, the effect of gas heat treatment ambient at the temperature of 950C
for 8hours using the gases NH3 or CH4 and using the gases NH3 and CH4 for
(4+4)hours of the distribution of the doping elements on Titanium alloys BT9 was
studied.
Oxide formation at the different treatment ambient as a reason of gas-phase
oxygen distribution to high depths in the samples was discovered.
This study deals with the basaltic rocks spread in Sheen Volcanic
Hill. Where the studies have signified that these volcanic eruptions
are an extrusive emergences, come from Sheen Barsheen Volcano,
which Were poured as basaltic casts of declinatio
ns towards the
east, separated by lateritic separations, date back in origin to the
end of late Miocene- Pliocene of big thicknesses near the rifting
line, over 800 m, thick.
In this research we are Studying the improvement of the thermal
conductivity of The 6063 aluminum alloys by Alloy elements
Adding such as (Boron & Titanium) .
In this Study we used (6063) aluminum alloy as a base metal
because it using of the fab
rication of Central Processing Unit(CPU)
heat sinks . First, we brought casting mold. We melted Aluminum
after weighting it ,and we adding Alloy elements (Boron &
Titanium), we selected the temperatures of the furnace at 1000 ℃
,for period 60 minute.
Aim: to compare NiTi hand instruments with Stainless- steel instruments according to separation, deformation and changing of working length during preparation of curved root canal in extracted teeth.
Materials and Methods: 24 of curved root canal we
re randomly divided into two groups. One group was prepared using stainless steel instruments and the other prepared by NiTi instruments. Separation and deformation of the two hand instrument systems were determined and the changing of working length during preparation were registered and compared. Data were collected and stastical analysis were conducted.
Results: Stainless steel system showed more separated and deformed instruments, but there were no significant differences between two systems. Also, change of working length was happened with stainless steel only but without significant differences with NiTi.
Conclusion: under the conditions of this study, it can be concluded that two hand instrumentation systems separated and deformed with no differences . However, working length was changed during use stainless steel but without differences between two system.
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.
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 .
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.
