Papers Published in the currently version
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A Study Maintenance and Production Problems in Two of Cement Factories in Libya by Using TPM .. The principle of this paper is to investigate maintenance and production problems in the cement factory in Libya with particular emphasis on Total Productive Maintenance (TPM). The paper presents the use of case study approach of production data and history, field visits. There is no clear TPM strategy and it has been also found that the lack of training and personal development is the main cause of this problem...moreBending of Sheet Metal (st37) Using 90 Degree to Estimate Blank Dimensions .. The major aim of this study is to ascertain the feasibility of using recycled products in formSeveral factors must be considered when designing parts that are being made by bending. The primary factor is minimum radius and angle of bending that can be bent successfully without metal cracking. Low carbon steel metal (st37), manufactured by Libyan Iron and steel Company, was used in this study. Various bending processes by Vee die for different radii and calculate thickness .... moreجدولة الإنتاج في نموذج الآلة الواحدة لتقليل عدد الطلبٌات المتأخرة: حالة دراسية ... إن مفهوم جدولة وتخطيط الإنتاج بالمؤسسات الصناعية له مدلولات متعددة، حيث أن منظومات التحكم في مدخلات ومخرجات أي مصنع أصبحت حديثا جزءا لا يتجزأ من النظام التشغيلي المتكامل. وتعتبر جدولة وتخطيط الإنتاج إحدى الركائز الرئيسية التي تتضمنها علوم بحوث العمليات بصورة عامة والبرمجة الخطية واللاخطية بصورة خاصة. تم في هذه الورقة التطرق إلى بعض قواعد الجدولة والمفاهيم المتعلقة بها وكيفية توزيع العمال على الآلات مع الأخد في الإعتبار الفترات الزمنية ذات العلاقة. إن الأهداف التي يمكن أخذها في الإعتبار متنوعة ولقد تم في هذه الورقة اعتماد تقليل عدد الطلبيات المتأخرة كدالة للهدف،حيثأن هذا هو الهدف الذي يسعى المصنع لتحقيقه واقعيا... لقراءة المزيدالطاقة المتجددة وحماية البيئة في إطار التنمية المستدامة في ليبيا أدى الإرتباط الوثيق بين البيئة والتنمية إلى ظهور مفهوم للتنمية يسمى التنمية المستدامة، الألمر الذي يستلزم الإهتمام بحماية البيئة لأجل تحقيق التنمية المستدامة. تشكل الطاقة المتجددة أحد وسائل حماية البيئة، لذلك نجد أن معظــــــــــم الدول تهتم بتطوير هذا المصدر من الطاقة وتضعــــــــه هدفا تسعــــــى لتحقيقه، ومنها ليبيا التي تعد من الدول السائرة في هذا الطريق للإستفادة من الإمكانيات المتاحة من الطاقة المتجددة. يتناول هذا البحـــــــث عرض التجربة الليبية في مجال الطاقة المتجددة كوسيلة لحماية البيئة، بالإضافة إلى ما تقدمـــــه هذه الطاقة من عوائد كثيـــــــــــــرة كتوفير فرص العمـــــــــــــل والحفاظ على الوقود الأحفوري .... لقراءة المزيدNucleation Stages of Isothermal Transformation in Titanium and Titanium Free Micro-Alloyed Steels.. This work is focused on nucleation stages during isothermal austenite transformation in two types of Vanadium micro-alloyed steels. Isothermal treatment was carried out in the temperature range 350 to 600οC. Metallographic evaluation using optical and scanning electron microscopy (SEM) enabled determination of the nucleation curves of isothermally decomposed austenite. Three curves are found to be relevant to this initiation stage of transformation: first curve is related ...moreAnalytic Study for 66 kV Sub Transmission System Planning .. The objective of this paper is to know the operation conditions of the system in terms of power flow, power losses and the weak points of the network. After which, solutions were proposed for solving such problems. The strategic and methodology for planning Criteria are chosen in a way that matches the general standards. A seventeen years plan is considered with short and long term planning applied and computed, system model was designed and a simulation for this model was performed using NEPLAN software... moreReprocessing of Post-Consumer Material Through Blow Moulding in Benghazi/Libya .. The major aim of this study is to ascertain the feasibility of using recycled products in form of postconsumer material using different regrind ratios to produce new products without a significant reduction in product quality. Four regrind ratios were used in this study: 0%, 20%, 50% and 100%. The used products were collected from different public places in Benghazi city-Libya. The properties under investigation are: mass, shrinkage, colour and solid density ... moreThe Status of Occupational Noise in Some Selected Factories on Libya .. In this paper occupational noise levels at selected factories were measured and compared with the international permissible levels using the integrating sound level meter (Quest 2800) during the year 2007. The calibration of the instrument was carried out before and after each measurement using the acoustic calibrator (Quest CA-12B calibrator). The method which was followed was measuring the sound pressure level of the different noise sources over a broad frequency band ... moreEffects on Dimensional Accuracy of Microstereolithographically Machined Parts after Addition of Light Absorber .. The paper’s aim is to investigate the influence of added light absorber (Tinuvin® 327) on dimension accuracy of three-dimensional (3D) micro-parts manufactured by a dynamic mask projection microstereolithography (µSL) system. One of the common problems with stereolithography systems, and particularly with µSL is the uncontrolled cure depth of the UV light when fabricating down-facing surfaces. To overcome this problem, light absorber is commonly used to control the cure depth... more
