The evolution of Polymers which are produced by the binding of many
structural units, i.e. monomers in series, has led to one of the most important
revolution in the twentieth century. Besides their resistive and plastic
properties which match tho
se of metals, they are better than those in many
characteristics as they are lighter, cheaper and above all easier to manufacture.
Polymers are in every day life usage, starting from consumptional commedities
(containors) through the most developed applications such as in space sectors
and space navigation, and as molecular lock –and- key elements in medicine
and chemical reaction activation and filtering, in addition to their use in
intercalation chemistry and in biological sensors, biocompatibility and organic
transistors among others.
We have
provided in this paper an attempt to study the deformation of oil
wellbore using modeling because of its capability to analyze the
different hypotheses which give us a vision of what is happening
or could happen . We have built a model of
the phenomenon being
studied are expressed in a horizontal section of the oil well on the
geological layer , after loading forces and stresses, we analyzed the
results ( deformations ) for the sandstone ( elastic rock ) and clay
(plastic rock ), where it is shown- by making a hypothesis fit with
abnormalities in the state of the stresses in the oil fields - that the
anomalies in the state of stresses of principles geological stresses
plays an important role in the deformation of oil wellbore.
Syrian Steeps has formed the most important ecosystem in
Syria ,in particular on both side , biodiversity vegetation and
wildlife. Despite of this fact, the structure of communities have
been changed by many effects ,thus Syrian steeps has lost it
s
balance .This study aimed to analysis the impact of topography
on characteristics of communities , We found 38% of variance
return back to elevation and landscape ,specially between the
low sites ( often Depression , valleys and Terraces ) and the
high sites (often summit of mountains and plains).
