The main goal of the presented research in this paper is to find a general way to solve longitudinal vibration problems. This way must solve these problems in nonlinear elastic bar systems with a biological factor.
We applied longitudinal vibration
equations in a nonlinear elastic bar with biological factor, the bar material was taken non-linear. and solve the problem in a bar of finite length.
The main goal of the presented research in this paper is to find a unified way to solve longitudinal vibration problems in nonlinear viscoelastic media with a biological factor and solve the problem in a bar of finite length.
Constant changes occur to the family requirements of housing with the flowing of time, and these changes
are due to the number of its members, their needs , the standard of living the economic conditions , or as a
result of increasing technical dev
elopments. This implies facing house requirements and applying changes
in the number of the house rooms, or the functions of these rooms. So the family either tends to change its
house to fit its needs, and that exhausts it socially and financially. They made adapt their house with the
family constant needs, and here comes the importance of achieving flexibility as the best economic solution
that reduces the value of the house, of it, by providing the efficiency of the best use of the whole spaces.
In addition, the role of flexibility is to respond to the social stability of families by the best use of the whole
time age of their houses.
This research handles the concept of design flexibility as one of the most economic housing standards in
the thesis of the most important architects , and goes through steps of applying it in the house functionally
and structurally in the designing phase by effective interaction between the designer and the user side by
side.
The goal of the presented research in this paper is finding a unified way to solve cross vibration problems in nonlinear elastic fields with a biological factor. We obtained the equations of cross vibration for elastic systems by using known mathemat
ical models, and then we solved the nonlinear cross harmonic vibration problem for a finite length of effective bar.
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.
The aim of the research is to identify the level of self-affirmation
and the level of ego flexibility among a sample of third-secondary
secondary students in public schools in Damascus Governorate.
And the relationship between self-affirmation and ego flexibility.
this paper presents a solution of non-linear viscoelastic bar systems transversal vibrations
problems in presence of biological factor. Governing differential equations were built, then
analytical expressions of the solution of this equations were found, which describe
transversal vibrations of a thin finite length bar
