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Register a new userتحسين مواصفات بيتون أقنية الري المسبقة الصنع المعالجة حراریاً بإعادة الرج
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عدنان نحاس( باحث )
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يشكل التقدم السريع في عمليات التصنيع و خاصة في المجالات الهندسية قاعدة متينة للنهوض بالاقتصاد الوطني ، و يساهم إدخال طرائق جديدة للإنتاج و من ضمنها أقنية الري في زيادة الإنتاج و رفع نوعيتة. و لما كانت مشاريع الري منتشرة على مساحة واسعة في أنحاء القطر فإنَّ زيادة الإنتاج و رفع مواصفات بيتون الأقنية يؤسس لمستقبل انتشارها، و يرفع آفاءة الري لمساحات واسعة. و يعدُّ نظام المعالجة الحرارية مع إعادة الرج إحدى الوسائل الحديثة من أجل رفع مقاومة البيتون المائي المستخدم.
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References used
Davidovits J. /Ancient and modern concretes: what is the real difference?/concrete Inter national . 1987 ,v.9._N12
Davis K.E./ Over vibration and revibration of concrete Amer . concr . Institute . vol .35 September 1988
Mernov C.A ./ Methods of heat treatment concrete / Moscow – 1984
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Addressing the problem of harboring affected as a result of disasters, whether natural
or the result of the wars that we are witnessing, Is one of the most important challenges
facing the world today, The proportion of this damage will be catastrop
hic for the
developing and poor countries Being weak material resources and suffers a great lack of
experience.
Therefore it was necessary to study this problem on the first two levels looking to
secure the rapid evacuation centers, As in the camps and others, The other level, which
comes in the second phase to be harboring a safer and more humane.
It took several different possibilities and solutions according to the situation and
economic resources, and this research will be subjected to one of these solutions, a
temporary housing units and pre-made
The aim of this study is improving the durability of precast products of Glass Fiber
Reinforced Concrete (GRC) and in the context of sustainability applications, reduction of
cement consumption and replacement of it with green materials. This study
has been done
to test the role of the natural pozzolan from Shihan Hill in As Suwayda as supplementary
cementing material by 10% -15% -20% - 25%, and to determine the effect of it on the
consistency and flexure strength over 180 days, as well as to test its role in improving the
micro-structure of the mixture by reducing the content of Ca(OH)2 and increasing C-S-H
& C-A-S-H gel, which were tested using X-Ray Diffraction (XRD) and Energy Dispersive
X-Ray (EDX) techniques, and as a result reduced the erosion of fibers as shown in images
by Scanning Electronic Electron Microscopy (SEM). Moreover the role of pozzolana has
been studied in controlling the degradation of the material over time which tested by
immersion in hot water 50° for 150 days and by drying – wetting cycles. Also the effect of
pozzolana on absorption, porosity and resistance of sulfates attacks was studied. The
results have shown that the used natural pozzolana has no negative effect on consistency or
mechanical properties, and it improved all the studied durability factors.
The aim of the research was to clarify the pre-processing steps required for satellite images
before starting to analyze and extract data from them using the ENVI program.
Radiometric and topographic correction applied to the Landsat image 2017, an
d then we
calculated the NDVI index for this image before and after applying pre-processing.
The results showed a difference in the spectral values of the image before and after the
radiometric correction, especially in near infrared band. The reflection values were
recorded in the original image between (40-50) and (300-3500) in the corrected image. The
difference in the reflection values after the topographical correction was also visible on the
near- infrared and infrared bands, especially in the points where shadows of the terrain.
Differences in the values of NDVI for 2017 were observed before and after the application
of pre-processing on the image, especially in points of good and very good vegetation
coverage with high values of the index.
The study concluded that it is important to follow the minimum number of steps required
for preprocessing steps in order to avoid unnecessary steps and recommend well tested,
readily available, and adequately documented data approaches and data products.
Rice fading channel simulator is designed by
using two methods, method of Equal Areas (MEA) and method of
Exact Doppler Spread (MEDS). A new procedure for computation
of the parameters of the deterministic simulation model is
presented. This meth
od is named as combination of MEA and
MEDS.
Comparisons between autocorrelation functions of both reference
and simulation models are introduced for different procedures. It is
demonstrated by several simulation results that statistical properties
of simulation and reference models will be more closer according
to the new method than MEDS and MEA.
The experiment carried out to improve the efficiency of drip
irrigation system , based on soil moisture. The indirect measure of
humidity Was used in the experiment, connected with the pointing
device (separator continued), and a control device pr
ogrammed on a
low humidity degree, which is degree the field capacity of the soil and
which value is 25%, and on a high moisture degree which is saturation degree
at 75%..
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