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Register a new userA Comparative study for the Effect of Loads on a Various Proportional Hydraulic Systems
دراسة مقارنة لأثر الأحمال على الأنظمة الهيدروليكية التناسبية المختلفة
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تستطيع أجهزة القيادة الهيدروليكية توليد قوى عالية و تحريك أحمال كبيرة. و قد تمكنا بمساعدة الصمامات التناسبية من التحكم بدقة الحركات و سرعتها في الدارات الهيدروليكية. و اعتماداً على المهمة المطلوبة، فإنَّنا نستخدم أسطوانة خطية أو أسطوانة دورانية أو محركاً هيدروليكياً دورانياً، أو نتحكم بالقوة أو بالضغط بحسب الطلب. و تستخدم الأسطوانات الخطية في معظم الأحيان. و سوف نقارن حسابياً بين خواص الأسطوانات الأكثر استخداماً عملياً. و قمنا بمقارنة حالات مختلفة للأسطوانات مع الأخذ بالحسبان وجود احتكاك و من دونه.
Hydraulic drives are able to generate high forces and move large loads. With the help of proportional valves, it is possible to control movements fast and accurately. Depending on the application, a linear cylinder, a rotary cylinder or a rotary motor are used. Linear cylinders are most frequently used. The following designs are therefore confined to this type of drive. We compare among various types of cylinders which are common by used. We compared different conditions for cylinders with friction and without it.
References used
Proportional Hydraulics, Workbook, Basic level. FESTO- DIDACTIC. 2008,120p
Proportional Hydraulics, Workbook, Advanced level. FESTO- DIDACTIC. 2008, 160p
Proportional and Servo Valve technology, The Hydraulic Trainer, Volume 2. R. Ewald, J. Hutter, D. Kertz, F. Liedhegener,W. Schenkel. A. Schmitt, M. Reik. HYDAC GmbH, Sulzbach.1989. 299p
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In this research, technical fabrics are used as blankets which prevent soil surface erosion and promote
seed germination as way to mitigation of desertification .
Five different types of fabrics are prepared of natural fiber: coir, hemp, jute, trea
ted cotton and raw
cotton, then three hydraulic properties for prepared fabrics are tested: swell, water absorption, water
vapour permeability.
It is found that all types of prepared fabrics are suitable to combat desertification whereas they have a
high water absorption and they reduce water evaporation, the fabrics of jute and treated cotton have the
highest water absorption and the fabrics of hemp and raw cotton have the lowest water vapour
permeability.
The research aims to complete the study of the theory and operation of networks
geodesic associated marine beach, whether horizontal or vertical, with display rods and
devices used in completion of topographic survey of networks in both land and ma
rine
parts.
In theoretical part it was addressed to specific shapes networks geodesic which
distinguish maritime works beach that takes the form of the morphological characteristics
of the natural land of each building proposed network, and the numerical characteristics of
each building proposed networks.
In the practical part the results of measurements and amendments was presented to
some forms of executed geodesic beach networks for several forms of works: (topographic
raise achievements within the existing and investor basin in order to establish a slider,
completion of the cadastral beach works in order to determine distortions in the existing
pier, clean the shipyard of silt and sediment.
Software has been reviewed to assist in completing marine works, utmost to obtain
the final marine charts.
The research concluded that specific proposals on vertical geodetic networks studies,
and identify the various parts of software related to marine works and ways to take
advantage of them.
The behavior of the basaltic shear diaphragms of the remaining buildings of ancient times
was investigated as experimental research,and its resistance to natural factors and
horizontal loads resulting from wind and earthquakes,to take advantage of
them in the
maintenance of modern buildings,which are associated with floors and beams as horizontal
shear diaphragmsIn the hot and cold areas of the African continent, Asia and other similar
areas,to replace the reinforced concrete shear diaphragms,and metal shear diaphragms that
lose their resistance to the above factors. When the buildings are inspected, the vertical and
slanted slits resulting from the side loads are placed,it was found that the appearance of the
cracks related to the hardness of the shear diaphragm section, the basalt stone
specifications and the design of the shear diaphragm base.The research was conducted
to determine the durability, water permeability and resistance to pressure and tensile
strength of basalt stone samples used in historic stone buildings and their location in
laboratory methods.Horizontal loads resulting from seismic intensity were determined on
the front of the building at the tile level according to international requirements and
specifications.The method of calculating the basaltic shear diaphragms was
applied by applying arithmetic to build a basalt stone from several floors and a basement,
taking into account the characteristic resistance of basalt, depending on its density from
pressure and stretching and basalt stone in calculating.
The objective of the research is to complete a theoretical and practical study related to
coastal marine works in order to calculate the amounts of silt removal from harbor basins
and entrances, and to present the methods and devices used in the pe
rformance of
topographic survey and numerical methods in the calculation and comparison of
quantities.
In the theoretical part, the factors that lead to the formation of silt deposits in the port
basins, the methods of their removal and the deepening of the navigational pathways to
enter and exit the harbors were addressed.
In the practical part, the results, methods of measurements and topographic results were
presented during the stages of investment of the port, at least two stages, at the beginning
of the investment and before the process of direct withdrawal, and then calculating the
quantities of the implemented and comparing them, to obtain maritime plans and final
quantities.
The research concluded with specific proposals on the methods of calculating the
quantities of the isolated port, the method of constructing the measured geodetic networks,
the achievement of the topographic elevation under the water surface, and the
identification of the software parts related to the various marine works and ways of
benefiting from them.
Research was conducted on a sample of 45 patients in the Department of hemodialysis in Alssad University Hospital in Latakia, It was implemented two policies nursing care included each policy applied on two experimental groups I and II for a period o
f 3 months, and the patients were monitored patients using the form author 3 parts of a demographic data and the activities of nursing care and monitoring the occurrence of complications. Results: The results showed the effectiveness of the application of the policy of nursing care, including exercise program in the prevention of the occurrence of complications during hemodialysis, effectiveness of exercise in the prevention of complications during hemodialysis, regardless of the activities of the sports program applied.
Conclusions: conclude from the study that the application of the policy of nursing care, including exercise program contributes to the prevention of the occurrence of complications (high / low blood pressure, nausea and vomiting, muscle spasm) during a session of hemodialysis.
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