The research study scenarios water hammer problem that may cause the destruction
of the irrigation pipes, pumping stations and equipmen and part of the irrigation project in
terms Ain Beida and its environs in the north-eastern city of Latakia, whe
re the project
seeks to quench 5,000 hectares of land with water pumped from Lake Dam November 16
occurrence . It consists of four pumping stations in addition to major irrigation systems and
irrigation systems subsidiary. Used in these stations pipes made of steel (Steel) , The
reservoir project's main reservoir is two.
Bently and Water CAD V8 XM Edition we have in this research with the help of the
CD-networking program
Modeling of these stations to save time and effort in the study, are HAMMER V8
XM Edition
Determine Adhamiya pressures and velocities in the case of runoff stable, identifying
pressures Adhamiya in the case of the flow is stable through the development scenario of a
water hammer caused by the sudden closure of the valve irreversibility thus leading larger
than the carrying capacity of pipes and fittings have a high pressure values, and put another
scenario shows the effect of non-use non-return valve in the water hammer occurs, and its
role as a good protection of them Thus leading to high pressures and dangerous far greater
than the carrying capacity of the pipe fittings values, and also used the compressed air
reservoir in the third scenario means other protection from water hammer, and we found
through Adhamiya pressures resulting values that the compressed air tank means better
protection; it has to prevent any increase in pressure values Adhamiya when water hammer
occurs, and kept her on the values that were in the case of steady flow.
The effect of different culture medias (water, MS solid, MS 1/2 solid) on germination
and growth of heliotropiun hirsutissimum Grauer. in vitro was studied with different
concentrations of gibberellic acid (0.001-0.01-0.1 and 1 mg/l).
The results
showed that best germination rate (80.5%) and root (20mm) and shoot
(35mm) growth were obtained in MS solid medium with 0.1mg/l GA3.
Addition of 0.1mg/l GA3 to MS1/2 solid medium improved germination rate
(75.44%), root (19mm), and shoot (24mm)growth.
When GA3 (0.1 mg/l) was added to water medium, germination rate reached
(65.33%), as well as root and shoot growth (12.66mm and20mm) alternatively after 2
weeks of planting.
Seedling of MS solid medium were transferred into pots contained torp medium to
adapting them with outside environment, and then surviving their growth until maturity
after 4 weeks.
This research carries how to do steel pipelines defects repair process by a simple and
easy way. At first the region that surrounds the defect is cleaned then the epoxy material is
put over the defect after mixing the resin with the hardener well.
Epoxy layer dimensions
depend on the defect dimensions that exists in the pipe. After that, the specimen is released
for a period of time to obtain the setting process. Several types of epoxy were used for
preparing series of specimens, which were tested on the pressure set up to estimate the
efficiency of this way in the repair, and knowing the pressure values that epoxy layer can
carry. A pipe of three holes their radius are equal, was treated by using ALTECO QUICK
EPOXY STEEL and the pressure gauge recorded many values that reached 18 bar. The
curve, that represents the relationship between the pressure which the epoxy layer carried
and its surface area, was drawn. It is found that the most effect factor in the repair process
is the specimen preparing and the thickness of the epoxy layer.
It is a cross in the hydraulic systems with long pipes case modeling of the hardest and most important cases in search. Of the most important and is considered Query to achieve study the changing resistance model is used to describe the changing liqu
id flow in the tube. As described by knowing the nature of the shear stress to the pipe wall and also know the nature of the flow ( laminar or turbulent ). The results of simulations of hydraulice shock caused by the sadden move of the hydraulic control valve which studied in the following cases:
1- Hard to improve the discharge of the pump rate.
2- Improve the discharge of the pump variable rate finally; compare the results of computer simulations with experimental results.
Monodispersed CdSe Nanorods nanoprticles with sufficient luminescence intensity have been prepared by chemical method in solution phase. CdSe as a core covered by Olic acide as an organic capping agent. The nanodots size obtained by two methods: dir
ectly from high resolution transmission electron microscopy (TEM) and using absorption peaks comparison with literature, the two methods are in good agreement. The optical properties and the luminescence intensity as a function of CdSe NRs concentration and the type of solvent (Chloroform and Toluene) have been investigated. The intensity of photoluminescence peak decreases and the peak shifts toward the blue energy side as the concentration reduced. The results show the relation between the polarity, the effect of surface, concentration, and the quantum effect on the optical properties.
يستعرض هذا البحث دراسة الحالة الإجهادية – التشوهية للعناصر المكونة من أنابيب فولاذية مملوءة
بالبيتون تحت تأثير الضغط اللامركزي. و تبيّن أن هذه العناصر تبدأ بفقدان استقرارها عندما تصل
التشوهات اللدنة قيمها الحدية، و الموافقة لحالة توازن العزوم الخار
جية مع العزوم الداخلية.
و لقد تم تعيين العلاقات الحرجة للأنبوب الفولاذي المملوء بالبيتون في حالة حدوث السيلان من طرفي
المقطع باستخدام طريقة جداءات لاغرانج غير المعينة. إضافة إلى ذلك تمّ اقتراح شكل جديد للعلاقة
الرياضية (ε(f = σ اللاخطية لعمل النواة البيتونية و الذي يأخذ بالحسبان تغيّر المقاومات المختلفة
للبيتون.
In this research paper, engineering properties of structural elements
formed of combined metalic sections are compared with the suggested
structural element made of steel pipes full of concrete.
Such a comparison is carried out for bending and tor
sion carrying
capacities of above mentioned elements with the same height and crosssection.
Structural characteristics and material properties of steel pipes full of
concrete are presented.
The Study of stress state created in concrete pipes using the general
principles of structures mechanics is presented. A special relation to
determine the carrying capacity of the concrete pipe under various levels
of axial compression is suggested.
Theoretical results got on the basis of Euler equation are compared with
experimental results of special specimen tested in laboratory. A good
agreement between theoretical and experimental results is demonstrated.
