The First Conference for Engineering Sciences and Technology
http://dspace.elmergib.edu.ly/xmlui/handle/123456789/9
CEST-20182024-03-29T02:22:08ZComparative Analysis of Electric Field and Potential Distributions over Porcelain and Glass Insulators Using Finite Element Method
http://dspace.elmergib.edu.ly/xmlui/handle/123456789/104
Comparative Analysis of Electric Field and Potential Distributions over Porcelain and Glass Insulators Using Finite Element Method
Krzma, Adnan S.; Khamaira, Mahmoud Y.; Abdulsamad, Maruwan
This paper investigates the electrical performance of outdoor porcelain and glass insulators when subjected to an 11 kV AC voltage. The insulators are modeled in two dimensions, and the analysis of COMSOL software is used for the finite element simulations. The electric field and voltage distribution in the vicinity of the insulator surfaces were computed and examined. Comparative studies of field and equipotential lines for the insulators are presented under both dry clean and wet polluted conditions. The pollution layer over the insulator surfaces are assumed to be uniform with 0.5 mm thickness. The simulation results show that the field distribution of porcelain and glass insulators were obviously depended on the contamination conditions. The critical of high field regions on both surfaces were identified and the effect of the pollution on the electric field distribution was revealed. The results also confirmed that porcelain insulator has slightly higher field distribution near the high voltage end compared with the glass surface.
2018-09-27T00:00:00ZAn Investigation of Corrosion Risks in the Oil and Gas Pipelines Using Analytical Hierarchy Process and Fuzzy Analytical Hierarchy Process
http://dspace.elmergib.edu.ly/xmlui/handle/123456789/103
An Investigation of Corrosion Risks in the Oil and Gas Pipelines Using Analytical Hierarchy Process and Fuzzy Analytical Hierarchy Process
Frefer, Abdulbaset A.; Matoug, Mahmoud M.; Haddada, Fatma L.
The products of crude oil and gas can be considered as the main backbone of the global economy. The oil and gas industry has faced many potential risks and problems when the oil and gas is pumped into the pipelines during the production, transportation, and processing. Although experts are solving these problems; some have been difficult to resolve and remained as a complex issue. Among these problems, were the issues of corrosion in the oil and gas pipelines. Risk assessment of the oil and the gas pipelines is considered as the core content of the integrated management of the entire pipelines. This paper aims to assess the risks of corrosion in the oil and gas pipelines in Sabratha platform and Wafaa field. First, the Analytical Hierarchy Process (AHP) is used to identify the risk rate of the different types of corrosion. Second, the technique of Fuzzy Analytic Hierarchy Process (F-AHP) is also used to identify the risk rate of the different types of corrosion. The comparison between the classical (AHP) and the (F-AHP) indicate that the results of both techniques were close.
2018-09-27T00:00:00ZKey Performance Indicators in Libyan Oil and Gas Projects
http://dspace.elmergib.edu.ly/xmlui/handle/123456789/102
Key Performance Indicators in Libyan Oil and Gas Projects
Matoug, Mahmoud; Frefer, Abdulbaset; Omer, Haleema
Nowadays, the management system based on key performance indicators (KPIs) is one of the most effective systems from a project management perspective. Unfortunately, common key performance indicators do not exist for the assessment of the performance and success of Libyan oil and gas projects (LOGPs). A project’s success or failure no longer depends solely on whether or not it meets traditional key performance indicators (cost, time and quality), instead, the assessment of a project’s success is required from the beginning until the end of the project and product lifecycle. The purpose of this study is to advance understanding of KPIs and to develop the most common key performance indicators (KPIs) for the Libyan oil and gas projects. By reviewing the existing research and literature, 11 (eleven) most important KPIs were identified. Questionnaire surveys and semi-structured interviews were administered to gauge the opinions of project practitioners representing clients, consultants and contractors on the KPIs most relevant to the local oil and gas industry. The findings indicate that the traditional KPIs are no longer applicable in measuring performance and success of oil and gas projects in Libya. Other key performance indicators such as Health, Safety and Environment (HSE), Efficiency of use resource, Profitability, Experience gain from the project, Shareholder Satisfaction, Sustainability, Maintainability and Reliability are increasingly becoming more important. Key performance indicators for the assessment of Libyan oil and gas projects are far more complex than simply meeting cost, time and quality.
2018-09-27T00:00:00Zقياس الوضوح الحضري للبيئة المبنية Measuring urban clarity of the built environment
http://dspace.elmergib.edu.ly/xmlui/handle/123456789/101
قياس الوضوح الحضري للبيئة المبنية Measuring urban clarity of the built environment
Agael, Fawzi Mohamed
من وقت قصير جدا كانت كيفية قياس الفراغات العمرانية قضية غير محددة في النقاش العلمي , وقد اعتمدت في جلها على نظريات نتائجها في الغالب انتقائية تعتمد على متغيرات معقدة قلما تتوفر مجتمعة في آن واحد في البيئة المبنية والعنصر الإنساني معاً .
تهدف هذه الورقة إلى تناول مؤشر الوضوح "intelligibility" للفراغات العمرانية والبيئة المبنية والعلاقة بين قياس "integration" التكامل و "connectivity" الترابطية للفراغات من خلال التحليل المحوري axial line analysis , ومن وجهة نظر نظرية التركيب الفراغي أو ( الحيز الفراغي ) space syntax .
ويساعد هذا المؤشر " intelligibility" إلى سهولة فهم البيئة المبنية المحيطة , وهو أمر بالغ الأهمية لموضوع الملاحة الحضرية ويساعد في فهم إعادة التشكيل المكاني الحضري للبيئة المبنية وتسهيل فهمها للملاحظ .
الكلمات الدالة: الوضوح الحضري , الفراغات العمرانية , تكامل , ترابطية , تحليل محوري ,الملاحة الحضرية.
since a very short time, how to measure urban spaces was an undefined issue in the scientific debate. Most of them have relied on theories that their results often selective; they based on complex variables that are rarely available simultaneously in the built environment and the human element.
This paper aims to explain the "intelligibility" indicator of Urban Spaces, Built Environment and the relationship between Global Integration measurement and Connectivity measurement of spaces through the Axial Line Analysis from the point of view of Space Syntax theory.
This indicator helps to understand the surrounding Built Environment, which is critical to urban navigation and helps to understand the urban spatial restructuring of the Built Environment and facilitate its understanding of the observatory.
2018-09-27T00:00:00Z