Multi-layered Prepacked aggregate fibrous composite (MLPAFC) is a new type of concrete, which is prepared in two subsequent stages of aggregate-fibre skeleton prepacking and cementitious grouting. In this study, ten MLPAFC mixtures were prepared in three subsequent layers incorporating different contents of four different types of steel fibres. Long and short hooked-end and crimped steel fibers were adopted with 3.0 and 1.5% dosages for the outer and interior layers, respectively. In-between the three MLPAFC layers, two layers of Glass Fiber Mesh (GFM) were inserted in five of the ten mixtures. The impact response of the MLPAFC mixtures was evaluated using two test methods. In the first, the ACI 544-2R repeated free-falling weight test was followed using disk specimens, while flexural free-falling weight on prism specimens was the second adopted impact test. Moreover, Weibull distribution was used to statistically analyse the discrepancies of the obtained experimental impact records. The impact tests results revealed that MLPAFC can absorb significantly high energy under falling weight impact due to its structure and the dual crack arresting activity of both steel fibers and GFM. The cracking number of impacts of MLPAFC cylindrical specimens without GFM was increased by approximately 530–870% compared reference specimens, while increment percentages reaching 1350% were recorded at failure stage. The impact resistance of MLPAFC prisms under flexural impact was noticeably improved, yet with lower percentages than cylindrical specimens. The insertion of intermediate GFMs let to additional developments in the impact strength of both cylindrical and prism specimens. arabic 14 English 97
Hakim S. Abdelgader (12-2020)

Abstract Fire is one of the greatest risks for every building and particularly for high-rise buildings. Usually, a building fire causes not only hazard to the occupants in a floor, but also a possible threat to the occupants in other floors and in particular to those located at upper storeys, with rising temperature and with killer smoke. Fire simulation can be performed using software packages designed for such a task. The fire simulation can often include aspects of hazard identification, fire growth and smoke movement, egress assessment, structural fire performance, sprinkler and fire detection system design, and smoke management system specification.The present thesis examines the up-to-date technologies available within the context of fire engineering simulation. This work gives an overview of available software packages that are used today in fire engineering simulation. It presents the procedure of fire simulation inside a high-rise building by using an advanced computer program named the Consolidated Model of Fire Growth and Smoke Transport ) CFAST for short. The CFAST program simulates fire action by calculating fire gases, the evolving distribution of smoke and temperature throughout a building during fire. This computer program is based on solving a set of equations that predict the state variables such as pressure and temperature. These equations are derived from the conservation equations for energy mass and the ideal gas law. It is important to know that the resulting errors, which might result, does not come from these equations, but rather they come from numerical analysis representation of the equations or from the simplifying assumption.
خالد عبد الونيس السكوري (2010)

يهدف هذا البحث إلى استعراض المواضيع الرئيسية لنظم النقل الذكية وفرص ومتطلبات تطبيقها في ليبيا، وتبدأ باستعراض الوضع الراهن لمنظومة النقل في مدينة طرابلس من خلال المعلومات التي تم تجميعها من الإدارة العامة للمرور بشعبية طرابلس، وقسم المرور والتراخيص التابع لها خلال الفترة من : (2003 ف إلى 2008 ف) ، ومن ثم تعريف نظم النقل الذكية و وظائفها ومجالاتها التطبيقية ، وهي النظم المتقدمة لإدارة المرور، والنظم المتقدمة لمعلومات المتنقلين ، ونظم عمليات تسيير المركبات التجارية ، والنظم المتقدمة لزيادة فاعلية النقل العام، والنظم المتقدمة للتحكم بالمركبة وسلامتها، مع مناقشة أهمية كل منها ومدى ملائمتها للواقع الليبي وظروفه الخاصة وتناقش الورقة متطلبات تطبيق نظم النقل الذكية في ليبيا مع التركيز على أهمية وضع خارطة هيكلية وطنية لها حيث تعرف مفهوم الخارطة الهيكلية و تناقش الخيارات المتاحة محليا، وتوصي بالنظر في إمكانية تبني إحدى الخرائط الهيكلية المطورة في الدول الرائدة في هذا المجال مع تكييفها حسب الظروف والاحتياجات الخاصة بليبيا ويخلص البحث إلى ضرورة إنشاء جهة عليا دائمة تمثل فيها الأطراف المعنية بنظم النقل الذكية جميعها، بما في ذلك القطاعات الرسمية والخاصة والأكاديمية، ويوصي البحث بالبدء بمشاريع تجريبية توضيحية مختارة بعناية قبل التوسع في التطبيق .
خالد عبد الله إبراهيم عبد الوافي (2009)