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Register a new userالعلاقات الحرجة للأنابيب الفولاذیة المملوءة بالبيتون بمقاومات مختلفة
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Damascus University ورقة بحثية
Publication date
2000
fields
Structural Engineering
and research's language is
العربية
Authors
إبراهيم أحمد الجراد( باحث )
Created by
Shamra Editor
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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 الخارجية 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.
No English abstract
References used
Gardner N.I. Design of Pipe columns. «Engineering . J. », vol. 53/3 No.3 , 1979, P. 404-413
Mataoa I. A. Opredelenie. Prochnost sostavnikh balok S trobo betonnim verkhnim poisom. Novie metodi rachota stroetelnikh konstrokts: Megvoz. Temat. SB. Tr.L. LISI , 1989
Neogip, sen H. Chapment. Concrete- Filled Tubular steel columns under eccentric loading the structurael Eng. 47,No. 5 , 1975
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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.
Bacteriological critical control points (CCPS) for automatic ice cream
industry were identified based on the primary ingradients of such industry,
processing stages and working environment.
Three thousand samples were analyzed during two productio
n seasons.
There were four critical control points in the company in which the study
was conducted, Pasteurization (mix) stage, cold (tanks) stage, freezing stage,
and hardning (tunnel) stage. The end-product did not coincide with the Syrian
standard because of these critical control point, which contributed by 15%,
25%, 35% and 25% respectively, meanwhile the remaining pointes, such as the
used water, choclate, air and workers were not critical control points under the
production conditions of the investigated company.
اثبتت الدبلوماسية اهميتها في تعزيز العلاقات بين الدول لذلك تحولت من مهمة مؤقتة إلى بعثات دائمة لذا من الضروري االتعرف إلى مدلول كلمة البلوماسية و مصدرها و تعريفها فقها و قانونا سيما بعد أن تم تقنين القواعد الناظمة لها في اتفاقية فينا للعلاقات البلوماسية لعام 1961 و غيرها...
Open relation extraction (OpenRE) aims to extract novel relation types from open-domain corpora, which plays an important role in completing the relation schemes of knowledge bases (KBs). Most OpenRE methods cast different relation types in isolation
without considering their hierarchical dependency. We argue that OpenRE is inherently in close connection with relation hierarchies. To establish the bidirectional connections between OpenRE and relation hierarchy, we propose the task of open hierarchical relation extraction and present a novel OHRE framework for the task. We propose a dynamic hierarchical triplet objective and hierarchical curriculum training paradigm, to effectively integrate hierarchy information into relation representations for better novel relation extraction. We also present a top-down hierarchy expansion algorithm to add the extracted relations into existing hierarchies with reasonable interpretability. Comprehensive experiments show that OHRE outperforms state-of-the-art models by a large margin on both relation clustering and hierarchy expansion.
Gas condensate consists essentionaly of two kinds of compounds:
hydrocarbon compounds and nonhydrocarbon compounds such as
(CO2, H2S, N2, H2O……..). Nonhydrocarbon compounds form a
very small rate in gas condensate ,but it effect on many properties
of
gas condensate. This research studies the effect of these componentson the pseudocritical pressure and pseudocritical temperature of gas condensate which are very important to study the phase behavioure of gas condensate and to determine the region of retrograde phenomenas which happen in gas condensate reservoirs.The study was done by presenting some methods to calculate these properties and the correcting of these values if there are nonhydrocarbon components in the condensate . the calculations were made by Stewartt methode and we put a computed program to calculate the correcting pseudocritical properties and noncorrecting ones, then we compear the tow values by drawing many diagrams between the mole fraction of the component and the calculated pseudocritical temperature and pressure.
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