The aim of this study is to study the possibilities of obtaining materials with a material
shift to the higher wavelengths that fall within the C-Band window currently used in fiber
optic communication systems. This is done by mixing pure SiO2 with
different materials
and different percentages. We find the evidence of refraction of the core material in an
optical fiber and study the change of these clues by sequential wavelength of light from the
solimer constants obtained from the OptiFiber program. We then calculated the physical
dispersion factor DM for each of the studied materials by writing a special matlab program
for this study and thus studying the change in the physical dispersion of these materials by
the sequential wave length.
Modified resole resin/short silica fiber composite materials have been prepared.
The resole resin was synthesized and then blended with Polyvinylbutyral (PVB)
polymer with different weight ratios to reduce its brittleness. The mechanical,
thermal
and physical properties of Resol- PVB blends were studied to
characterize these blends and select the most appropriate mixing ratio of
polyvinyl butyral with resole resin, which was identified at 15 phr of polyvinyl
butyral for every 100 parts of resole resin.
Composite materials
ألیاف السیلیكا القصیرة
راتنج الریزول المعدل
مواد مركبة
مواد شفافة راداریاً
اختبارات فیزیائیة و میكانیكیة و كھربائیة
اختبارت حراریة و اختبارات اللفح الحراري
محلل الشبكة الشعاعي
Short silica fiber
modified resole resin
radio transparent material
physical mechanical and electrical tests
thermal and ablation test
vector network analyzer
S – Parameters
المزيد..
The goal of this study is to produce STFs and measure
their rheological behavior In order to select the appropriate STF for
liquid armor application.
Five species of Poaceae were collected: Briza minor L., Briza
maxima L., Setaria viridis (L.) P.B., Setaria verticillata (L.)
P.B., and Eleusine indica Gaertn., Fruct. Sem. Pl. which
recorded for the first time in the Flora of Syria. Peels from
a
daxial and abaxial leaf surfaces were prepared and stained
with the safranin . The results showed a clearly differences in
these sides: existence or absence of the epidermal elements,
their shapes and their measurements among the species from
one side, and between adaxial and abaxial leaf surface for the
same one from the other side.
experimental tests have been performed
on the ball bearings lubricated with grease and the trends in the
amount of erosion affected by the contamination of the grease were
determined. The contaminant concentration as well as the particle
size is varied.
During this study, various types of silicon oxide were prepared
as aerogel and xerogel using multiple precursors and different
drying technics. Some of these samples were prepared from
Sodium silicate (waterglass) Na2SiO3 as a precursor which is a
cheap material, while others were prepared using tetraethoxysilane
(TEOS).
This paper deals with the development of engineering database
on the changes in the mechanical properties of high performance
concretes mixtures when exposed to high temperature up to
850oC. The results of an experimental investigation into the
e
ffects of high temperature on the residual compressive strengths
for high performance concretes made with ordinary Portland
cement are presented.
There are various types of industrial fibers such as: (polypropylene fiber, fiberglass, silica fume powder, etc..). These fibers are used widely as additives for improving concrete strength. We study in our research the effect of each of polypropylen
e fibers, steel fibers, and silica fume powder, on two kinds of concrete mix the first ordinary mix and the second is mix other with Mazar sand. We found after the studying of mechanical properties for those mixes that a slight improvement on tensile strength of concrete has
occurred, an increasing of compression strength of concrete has happened, and the failure style has changed according to the type of additive compared with concrete without additive.
Tripoli in the studied area is a porous, friable and lightweight siliceous
sedimentary rock composed mainly of microcrystalline quartz, and were found
to be resulting from silicification of limestone, and consists of microcrystalline
quartz and im
purities of calcite and halite; the silica ratio ranged between
63.01 – 96.75 % .
