This paper investigates the current status of the implementation level of Just-In-Time (JIT) within the Oil & Gas (OGI), Iron & Steel (ISI), Cement (CI) and Construction (C) Industries within Libya and its implication for management within the said industries. A survey methodology has been applied in this investigation using an intensive questionnaire and one-to-one interviews of the correspondent organizations. Based on the analysis of the survey questionnaire and the one-to-one interview responses, the results show that the management body does not have a clear strategy towards most of the areas that are considered as being crucial in any successful implementation of the JIT techniques. The implementation levels of the JIT techniques are found to be in the modest levels even in the organizations that have indicated themselves as JIT implementers. The research has identified management limitations within the investigated areas and has pointed to areas where the management body needs to take immediate actions in order to achieve an effective and successful JIT implementation within their organizations. This is an important finding for the future success of the Libyan industries and the similar ones. arabic 18 English 107
ٌRajab HOKOMA(1-2016)

Abstract During the last years there has been an increasing consciousness of the environmental problems, created by the use of fossil fuels in electrical power generation consumed by converting cooling systems. In addition, the use of common working fluids (refrigerants), with their ozonedepleting and global warming potential, has become a serious environmental problem. This underlines the need to implement advanced, new concepts in building air-conditioning. The most common global type of thermally driven technology to produce chilled water is absorption cooling. For air-conditioning applications, absorption systems commonly use the water/lithium bromide or ammonia/water as working pair of fluids. The objective of this study is to establish a fundamental basis for further research and development within the field of solar cooling. In this study, an overview of possible systems for solar powered refrigeration and airconditioning systems will be presented. The concept of the ‘Solar Cooling Path’ is introduced, including a discussion of the energy source to the collector. Brief information and comparisons of different absorption refrigeration cycles are also presented. A solar-driven absorption refrigeration system has been selected as a case study for a further detailed investigation. A low temperature heat source can be used to drive the absorption refrigeration cycle, making the system suitable for integration with solar thermal collector. The Transient System Simulation program (TRNSYS) and Engineering Equation Solver (EES) simulation tools are used to model and analyze the performance of a solar-driven absorption refrigeration system. Analysis of the absorption cycle system is initiated by steady-state analysis. A modeling of single effect water/lithium bromide absorption cycle was constructed to study the effect of the operating variable on the system performance and to determine the optimum operating conditions for the absorption cycle. This model was developed by Engineering Equations Solver program (EES). In practice, the ambient conditions and solar radiation are not constant. Therefore, a dynamic analysis is useful for determining the characteristics of the system during the entire year, and dimensioning the important components of the solar collector subsystem, such as storage tanks and collector area. The overall solar absorption cooling system has been simulated by the TRNSYS program with a typical meteorological year file containing the weather parameters for the capital of Libya, Tripoli. Finally, a parametric study was carried out to investigate the influence of key parameters on the overall system performance of solar absorption cooling system and hence to improve and optimize the system design. Results from the parametric optimization indicated that with an area of 130m2 of flat plate collectors with an inclination of 32° and 3.5m3 of storage tank is achieved to cover the demand of air conditioning of a 35kW absorption chiller.
إبراهيم محمد علي الطويري (2011)

تم التركيز في هذه الورقة على دراسة مستوى تطبيق واستخدام تقنيات ومتطلبات الإدارة بالجودة الشاملة في مصانع الإسمنت الليبية بغرض معرفة مستوى القيام بتطبيق مبادئ ومتطلبات الإدارة بالجودة الشاملة في عملياتها الإنتاجية، هدفت الورقة لدراسة مستوى القيام بتطبيق المتطلبات الأساسية والمبادئ التي تعزز نجاح الإدارة بالجودة الشاملة في مصانع الإسمنت الليبية، بهدف تحسين مستويات الأداء، وكعينة لهذه الدراسة تم اختيار كل المستويات الإدارية العليا لهذه المصانع من مدراء، ومدراء الإدارات، بالإضافة لرؤساء الأقسام، وكذلك المهندسين ذوي العلاقة بأمور الإنتاج والجودة وعمليات الصيانة ، ولتحقيق هذا الهدف تم تصميم استمارة استبيان خلصت نتائج تحليل بياناتها إلى وجود إنخفاض كبير في مستوى ممارسة وتطبيق تقنيات الإدارة بالجودة الشاملة في مصانع الإسمنت الليبية، ومحدودية المعرفة بأسس ومتطلبات التطبيق، ومحدودية الدعم من قبل قطاع الصناعة بتشجيع التطبيق، إضافة إلى وجود بعض المعوقات التي تحول من ذلك التطبيق في المصانع المشمولة بهذه الدراسة. وكنتيجة لذلك اقترحت الدراسة على متخذي القرار في مصانع الإسمنت الليبية ضرورة اتخاذ إجراءات فورية، بوضع استراتيجية لكشف وتحليل المعوقات التي تمنع من تطبيق هذه التقنيات، وكذلك العمل على وضع قرار برامج التدريب والتطوير لكافة العاملين لأجل التطوير والتحسين والرقي بكافة المستويات، وبما يتماشى مع السياسات والأهداف المرسومة لمصانع الإسمنت الليبية. arabic 200 English 0
أ.د. رجب عبدالله جكومة, هالة منصور إمعيقل, سليمان محمود الزوي, المعتصم بالله العكاري(6-2019)