Two-layered Grouted Aggregates Fibrous Concrete Composite (TGAFCC) is a new category concrete which became popular recently and attracted the attention of researchers globally. Recent studies indicated that TGAFCC has notable improvement in mechanical properties, which has been sufficiently documented. However, the impact behaviour of TGAFCC when combined with Glass Fibre Mesh (GFM) and Textile Fibre Mesh (TFM) is still unexplored. The research objective is to study the effect of GFM and TFM inser- tion in TGAFCC against the drop hammer impact. Twenty one TGAFCC mixtures were prepared and divided into two series; non-fibrous concrete and fibrous concrete. The combined action of GFM and TFM of various diameters were inserted between the two layers and tested experimentally against drop mass impact. Additionally, all fibrous specimens were reinforced with a constant 3% dosage of 5D hooked end fibre. All specimens were tested under repeated drop mass impact as per ACI Committee 544. The impacts number or number of blows till the first visible crack and failure, impact energy at the first vis- ible crack and failure, impact ductility index and cracking configuration were examined. Besides, Weibull distribution was used to examine the variations in the test results, where impact numbers were pre- sented using the reliability function. The research findings indicate that inserting GFM and TFM between the two layers combined with 5D hooked end steel fibres, provided high impact resistance, higher absorbed energy and prolonged failure duration. Increasing the diameters of the GFM and TFM insertions, in both non-fibrous and fibrous concrete resulted in increasing the impact numbers till the first visible crack and failure. The experimental findings confirm that the major contribution of impact resistance comes from the 5D hooked end steel fibres, while the share of the intermediate meshes was significantly lower. arabic 13 English 88
Hakim S. Abdelgader (12-2020)

تسعى المنظومات أو المؤسسات المختلفة الخدمية أو الإنتاجية إلى تحقيق أهدافها بتقديم خدماتها أو منتجاتها وفقا لمتطلبات الزبائن وما يحتاجه السوق , ووسط المنافسة على جودة هذة الخدمات أو المنتجات من المؤسسات الأخرى ذات النشاط . وفى ظل ظروف هذه المنافسة كيف يمكن لإدارة هذه المؤسسة أو المنظومة التأكد من أنشتطها وإمكانياتها من أنها مناسبة لتحقيق هذه الأهداف (رضا الزبون) , ومن أنها لا تواجه قصور أو إنحرافات فى القيام بهذه الأنشطة. بناء على ما تقدم يتناول البحث التعريف بأسلوب وتقنية التدقيق وأنواعه وأغراضه ومميزاته وطرق تطبيقه , حيث أنه أداة علمية وعملية من أدوات البحث والإستقصاء يمكن إستخدامه من قبل المنظومات أو المؤسسات ذات الأنشطة المختلفة , للأغراض وللأهداف المتنوعة , مثل التأكد من أن تنفيذ الوظائف والأنشطة مطابق لما أريد أن يكون , ولقياس الأداء وتصحيح الإنحرافات ومعالجة القصور , وأنه يمكن تطبيقه من مصدر داخلى وهو ما يعرف بالتدقيق الداخلى ( إدارة الجودة الخاصة بالمنظومة ) أو من مصدر خارجى ( من الزبون طالب الخدمة أو المنتج كمقدمة للتعاقد , أو من منظمة تخصصية للحصول على علامة جودة معينة ) وهو ما يعرف بالتدقيق الخارجى. ومن ثم يتناول البحث تطبيق أسلوب وتقنية التدقيق عمليا وما يتضمن ذلك من إختيار منظومة خدمية ( منظومة صيانة طائرات ) موضوع الدراسة , ويشمل ذلك دراسة هذه المنظومة من حيث الهيكلية الإدارية وجمع المعلومات الخاصة بالمهام والمسئوليات وإجراءات العمل للأنظمة الرئيسية والفرعية ( الدوائر والأقسام ) الخاصة بها وإعداد خطة تطبيق التدقيق من تحديد نوع التدقيق , إعداد ورقات التدقيق ( قوائم الكشف والإستقصاء) بناءا على دليلي المهام والمسئوليات وإجراءات العمل الخاصة بالمنظومة . ويقدم البحث الدراسة التحليلية لنتائج التدقيق وما يتضمنه من كشف القصور والإنحرافات وتقسيمها وتقييمها والتعريف بمسبباتها , وتقديم المقترحات والتوصيات للمعالجة والتصحيح. Abstract Most of different productive, service Organizations or Institutions trying to attain their objectives, by producing these services or / and products according to the market needs or customer requirement, and through competitiveness of those Services quality from the other Institutions of the same activity. Therefore with the condition of this competition, how can the Organizations ensure that their activities are Suitable to reach these objectives (Customers Satisfaction) and they don't face failures or deviations. As a result this research presenting the audit technique, which including audit definition, types, purposes, and application procedures. As it’s a scientific, practical investigating, and a researching tool, can be used for different purposes and objectives, like ensuring that the activities, functions, are conformance to the desired goals, and for performance measuring, failures or deviation correctiveness. The auditing technique can be performed from internal source (By Organization's Quality Division), which is known as Internal Audit, or from outside source (by the customer for a precontract survey, outside agency for quality registration mark) which is known as External Audit. Then the Auditing technique that is applied in this research includes , Selection of Aircraft maintenance Organization as a case study , and Collecting , studying the data concerning the duties responsibilities and work process of the influential divisions in the Organization , and Selection of the audit type (Internal Process Audit ), it's plan application and Preparing work papers ( Audit Check Lists ( , related to the policy , procedure , and work process manuals of the concerned Organization. The Analytical study of the auditing results will be applied, which includes identifying and classifying the deviations and failures, and evaluating the reasons. At the end we presenting the proposals, recommendations for treatment and corrective action.
أحمد الطاهر السنى (2007)

Abstract Today computers play an integral part in the analysis and design of civil engineering structures. Hand calculation is limited to simple structures, and initial member sizing (either during the preliminary design or prior to computer analysis). The matrix theory of structural analysis first began appearing in the early 1950s. Since that time, the engineers were not familiar with this new concept, hence a relationship between the matrix structural analysis, and the classical methods arise but the structural engineers as designers still follow the classical methods of solution such as, Hardy Cross moment distribution, Kani's method and deflection distribution ,method (D. D method) , etc. Structures that were too complicated to solve by classical calculations can now be handled with comparative ease when using computers. The analysis of complicated systems, such as highly indeterminate structures like space structures, grids-shells, etc. often could be handled by making many simplifying assumptions, to such extent, that in many cases the validity of the results had to be questioned. The use of computer techniques has broadened the scope of what the engineer can now handle in a reasonable time, and at a reasonable cost. Structures such as canopies, floor systems, and bridge deck systems. Are known as Grid structures. The members of a grid structure in general are subject to torsion as well as to shear and bending. Since the external loads are normal to the plane of the structure, the axial deformations are negligible. Consequently, a free joint in a grid is subject to a linear displacement perpendicular to the plane of the structure and to a rotation in the plane of the structure. It must be realized that the; use of so called matrix algebra methods and principles and methods of analysis, systematic matrix techniques have been now developed into recognized methods.
عمر على عودة (2009)