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Register a new userدراسة بعض حالات شذوذ الحقول الفيزيائية في المرونة
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Aِl-Baath University رسالة ماجستير
Publication date
2015
fields
Mathematics
and research's language is
العربية
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دراسة بعض حالات شذوذ الحقول الفيزيائية في المرونة : موضوع الرسالة هو الأوساط المستمرة من النوع المرن وذات التشوهات الصغيرة ( التي تدعى بالأجسام الصلبة)
No English abstract
References used
W.Nowacki, Theory of Elasticity , PWN Warsaw 1970
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foamed concrete is a concrete made by cement slurry mixed with foaming agent, so
that foamed concrete is lighter than conventional concrete. The objectives of this study is
to produce this kind of concrete, and to study some of its physical and mec
hanical
properties. Mix design of concrete was made for four required densities (1000,
1300,1600,1900 kg/m3), cement content of 350 kg/ m3, and water to cement ratio equal to
0.5. Different tests were performed to determine some properties of product concrete such
as density, compressive strength and splitting tensile strength. The results demonstrated the
possibility of production foamed concrete with wide range of density and strength. The
oven dry density of foamed concrete was in the range of (870-1773 kg/m3) , compressive
strength was in the range of (2.95-16.2 Mpa ), and the splitting strength was in the range
of (0.32-1.76Mpa).
In this paper the Einstein's transition coefficients are introduced,
Their ratios are found by setting the transitions from one state of an
atom to be in balance with the reverse transitions between the same
two states in thermal equilibrium.
The study was carried out at Soil Research Center in the province of Daraa
during 2011 in order to study some physical and moisture characteristics for
cinnamon soil, which occupies (48000 km²), equivalent to 26% of the area of the
Syrian Arab Rep
ublic and represents the cultivation of growing field crops
with a rainfall ranges between 150- 300 mm. The results showed that the
mechanical analysis for soil referred that its texture is clay with a good ability
to retain water, the field capacity rated between (30-38.85)%. The studied soil
has high value of available water (38.93mm) and useful water (25.69mm) in the
surface layer. The highest value of permanent wilting point and hygroscopic
moisture was reached in the final depth in studied profile soil, It was also
distinguished a high total porosity ranged between 51.78 and 55.59% with
a good air porosity amounted to 9.38 - 15.47 % in different depths and with the
decline to 5.51 % in the depth 30 - 45cm.
Background& Objective:Vascular rings are unusual rare congenital anomalies .Its incidence is less than 0.2%.Most of these defects are discovered early in infancy or childhood .They result in complete or partial encirclement of the trachea and/or esop
hagus .Some vascular rings are associated with other congenital heart defects, others may be isolated deficits. We present here eleven cases which we have encountered since the mid of 2009.These cases were managed surgically with good results .Through this study, we aim at demonstrating how to treat these cases surgically and to clarify the best approach for each case.
Materials & Methods: A retrospective study at Damascus University Cardiac Surgery Hospital in the period between 2009 to 2010 was conducted.11 patients with diagnosed vascular rings underwent surgical repair.
Results: Ages ranged between 1.5 months to 5 years with almost equal sex distribution. Most complaints were respiratory. Vascular rings include double aortic arche, aberrant left Subclavian artery and aberrant right Subclavian artery .Associated defects were in54% of cases. No complications were noticed postoperatively or in the follow up period which extended between 7 and10 months' .Remarkable relief and symptoms release were achieved postoperatively.
Conclusion: Surgery affords excellent long-term resolution of symptoms. Early diagnosis and surgery are imperative to reduce the long-termsequels.
The samples of various food products have been collected at several times per season
over two years, in order to determine the content of phytic acid to investigate the influence
of the adopted treatment methods on phytic acid degradation and to mi
nimize their
unhealthy effects.
It's been shown that PA is found at high levels in the mentioned products especially,
in unripe fruits where its levels ranged between (0.15-3.57%g.s.d) while PA levels were
less in the process products and ranged between (0-1.95 %g.s.d).
Technological processes were applied to biodegrade phytic acid of some foods and
the reduction ratio ranged between 20-60% of the whole content of PA.
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