Nucleation Stages Onset and Intra-granular Ferrite Morphologies in Titanium Free Micro-Alloyed Steel
Journal ArticleThe aim of this work is focused on nucleation stages with emphasis on the development of intra-granular ferrite morphologies during isothermal austenite transformation in titanium free micro-alloyed steel. Isothermal treatment was carried out in the temperature range 350 to 600οC. These treatments were interrupted at different times between 2 and 1800 s in order to analyze the evolution of the microstructure. Metallographic evaluation was done by using optical and scanning electron microscopy (SEM) enabled determination of the nucleation onset at all treatments and subsequent on the development of intra-granular ferrite of isothermally treated Ti free micro-alloyed steel. The results show that at high temperatures ( 500 C) polygonal intra-granularly nucleated ferrite idiomorphs, combined with grain boundary ferrite and pearlite were produced and followed by an incomplete transformation phenomenon, At intermediate temperatures (450 and 500 C) an interlocked acicular ferrite (AF) microstructure is produced, and at low temperatures (400 and 350 C) the sheave of parallel acicular ferrite plates, similar to bainitic sheaves but intra-granularly nucleated were observed. In addition to sheaf type acicular ferrite, the grain boundary nucleated bainitic sheaves are observed.
Abdulnaser Hamza Ahmed Fadel, (06-2017), Libya: International Journal of Engineering Science and Innovative Technology (IJESIT), 2 (3), 170-178
التخطيط الاستراتيجي وأثره على تطبيق متطلبات الجودة الشاملة في التعليم الجامعي من وجهة نظر أعضاء هيئة التدريس في جامعة سرت - الليبية
مقال في مجلة علميةالتخطيط الاستراتيجي وأثره على تطبيق متطلبات الجودة الشاملة في التعليم الجامعي من وجهة نظر أعضاء هيئة التدريس في جامعة سرت - الليبية
مصطفى عبدالله محمود الفقهي، محمد عمر شقلوف، (06-2017)، اليمن: ص ص. 125-154 المصدر المجلة العربية لضمان جودة التعليم الجامعي. مج. 10، ع. 28، 2017، 28 (10)، 125-154
Evaluation of the Quality of Ground Water for Drinking and Irrigation at Sidielsayeh Garbage Dump, Tripoli, Libya
مقال في مجلة علميةAbstract: This study aimed to assess the quality of groundwater in the area surrounding Sidi Al-Saeh Landfills in south Tripoli, to determine the extent of groundwater validity of this region for human consumption in terms of chemical and germ sides as well as agricultural use, and to compare the obtained results with Libyan drinking water standard specifications for the year 2013 and specifications of Food and Agriculture Organization for irrigation water. In order to accomplish this work, 14 samples of existing wells in the region have been studied. The analyses included: Electrical Conductivity (EC), Total Dissolved Salts (TDS), PH, cations (K+ Mg+2 , Ca+2 , Na+ ), and anions (NO3, SO4 -2 , HCO3, and Cl- ). Furthermore, the sodium adsorption ratio "SAR", adjusted sodium adsorption ratio "adj-SAR", remaining sodium carbonate "RSC" and some heavy micro-elements such as (Cu, Fe, Pb, Cd, Cr, Zn, and Ni) have been determined. Total coliform and faecal coliform "Esherichia coli" have been detected; the analyses result showed an increase in values of total dissolved salts "TDS" in the most samples, where the highest value exceeded 1450 mg/l. Analyzes result of heavy elements were less that the allowable limit in drinking water except two wells known maximum limit allowed in drinking water, namely well No. 1 where cadmium and lead concentrations were increased (0.074 mg/l) and (0.022 mg/l), respectively, for the favorable limit in drinking water. In the well No. 14, it is recorded a high lead concentration than the allowable limit in accordance with the Libyan Drinking Water standard specifications, which is 0.026 mg/l. Furthermore, the wells samples gave germ acceptable results, and then it is considered as potable water in germ side and according to the Libyan Drinking Water standard specifications. Regarding the suitability for the cultivation: upon American Salinity Classification, all water samples occurred within the species (S1-C3) (High salinity water sodium concentration reduced) and the use of this water type causes a problem of permeability in some soils, except certain precautions to be taken for use in such lands.
خيري محمد ميلاد العماري، (06-2017)، Journal of Soil & Water Sciences; Suez Canal Universit,: Journal of Soil & Water Sciences; Suez Canal University,، 1 (3)، 7-15
مساهمة الصكـوك الإسلامية في تمويل عجـز الموازنة التنموية في ليبيـا
مقال في مجلة علميةملخص البحث:
أجري هذا البحث للتعرف على إمكانية الحد من عجز الموازنة العامة المتكرر خلال السنوات الأخيرة في ليبيا، وذلك بطرح فكرة تمويل جزء من المشروعات التنموية الممولة من قبل الدولة في الباب الثالث من الميزانية" باب التنمية أو التحول" باستخدام الصكوك الإسلامية، ولتحقيق هدف الدراسة تم استخدام أسلوب المنهج الوصفي التحليلي المدعم بالبيانات المتحصل عليها من التقارير والدوريات والأوراق العلمية، وتوصلت الدراسة إلى إمكانية الاستفادة من تجارب بعض الدول في مجال إصدار الصكوك الإسلامية وتداولها، حيث أثبتت التجارب السابقة أن الصكوك وسيلة فعالة لتمويل المشروعات التنموية، وتعد أحد البدائل التي يمكن استخدمها للحد من العجز في الميزانية التنموية للدولة، هذا الأمر يتطلب من الدولة الليبية ضرورة العمل علي توفير البيئة الملائمة لعملية إصدار الصكوك الإسلامية وتداولها والمتمثلة في استحداث البنية التشريعية وإنشاء السوق المالي الإسلامي، وكذلك نشر ثقافة الوعي بأهمية الصكوك الإسلامية في أوساط المجتمع الليبي.
عبدالحكيم محمد امبيه - عبداللطيف البشير التونسي، (06-2017)، مجلة مجلة جامعة صبراتة العلمية: جامعة صبراتة، 1 (1)، 31-52
المنشآت الصحية بمدينة طرابلس القديمة في العهد العثماني ( دراسة معمارية لمستشفى الغرباء النموذج الوحيد الباقي منها )
مقال في مجلة علميةالملخص
يتناول هذا البحث بالدراسة أحد المباني التاريخية المهمة بمدينة طرابلس القديمة والمتمثل في مستشفى الغرباء الذي أُنشئ خلال الفترة الأخيرة من الحكم العثماني للمدينة، وتأتي أهمية دراسة هذا المبنى من كونه النموذج الوحيد الباقي للمنشآت الصحية بالمدينة، أما الجانب الآخر من أهمية دراسة هذا النموذج المعماري فتأتي من تكوينه المعماري المتميز الذي لا يشبه أياً من الطرز المعمارية التي أُتبعت في بناء العمائر الأخرى في المدينة. يقدم هذا البحث وصفاً معمارياً مفصلاً لهذا المبنى من الداخل والخارج معتمداً على أسلوب الوصف الأثري والمعماري لجميع أجزاء البناء، وذلك لأجل تسليط الضوء على المدرسة الهندسية المعمارية التي بني هذا المستشفى على أساسها. وعليه فان البحث يهدف بشكل عام إلى دراسة نموذج معماري ظل بعيداً عن اهتمام الدارسين لعمارة المدينة وذلك بسبب عدم وضوح معالمه الوظيفية، هذه المعالم التي تغيرت في أحيان كثيرة وكانت في كل مرة تتبع الغرض الوظيفي الذي يؤديه المبنى، لدرجة أن التركيز على الشكل المعماري للمبنى كمستشفى ظل غامضاً عند كثير من الدارسين المتخصصين، وكذلك عند المهتمين بهذا الجانب.
عادل المبروك المختار الفار، (06-2017)، مجلة جامعة صبراتة العلمية: جامعة صبراتة، 1 (1)، 98-125
Graphene oxide as a nanocarrier for controlled release and targeted delivery of an anticancer active agent, chlorogenic acid
Journal ArticleWe have synthesized graphene oxide using improved Hummer's method in order to explore the potential use of the resulting graphene oxide as a nanocarrier for an active anticancer agent, chlorogenic acid (CA). The synthesized graphene oxide and chlorogenic acid-graphene oxide nanocomposite (CAGO) were characterized using Fourier transform infrared (FTIR) spectroscopy, thermogravimetry and differential thermogravimetry analysis, Raman spectroscopy, powder X-ray diffraction (PXRD), UV–vis spectroscopy and high resolution transmission electron microscopy (HRTEM) techniques. The successful conjugation of chlorogenic acid onto graphene oxide through hydrogen bonding and π–π interaction was confirmed by Raman spectroscopy, FTIR analysis and X-ray diffraction patterns. The loading of CA in the nanohybrid was estimated to be around 13.1% by UV–vis spectroscopy. The release profiles …
Fawzi Mohamed Amin Mohamed Elfagaih, (05-2017), Materials Science and Engineering: C: Elsevier, 74 (74), 177-185
Modeling The airflow Properties around Teardrop for Different Tail Lengths
Journal ArticleAbstract
This paper provides a CFD comparison of tow turbulence modeling approaches (SST) and (K-epsilon), with application to the simulation of a teardrop. As well as, the study investigates and compares among 3 different models in a range these types in order to assess the suitability of CFD for use when calculating drag co-efficient. Moreover, the study focuses on 3 different velocities to be impacted with the drag co-efficient. Whereas, the pressure over the body was used to calculate the drag co-efficient for each of the 3 teardrops shapes.
Hesham Suni Omar Baej, (05-2017), Libya: 1st Conference of Industrial Technology ( CIT2017), 1 (2), 1-6
EVALUATION OF BANK'S PERFORMANCE BY USING BALANCED SCORE CARD: PRACTICAL STUDY IN LIBYAN ENVIRONMENT
مقال في مجلة علميةhe purpose of this study is to contribute to the understanding of how BSC is developed and applied in evaluating the performance of he umhouria Bank (B) in Libya. Using the concepts of Kaplan and Norton, and the data made available from the bank, a BSC was derived to measure the performance of the bank between 2007-2010. he analysis assisted the cause-effect relationships between the non-financial, and the financial dimensions of the BSC. Due to lack of research work, in this area, in the banking sector in Libya, this study shall contribute to the knowledge on how banks in Libya may apply the BSC to evaluate their performance, and how they might turn strategic vision into potential performance. he author proposed some future research needs required in this area. he use of the BSC developed here is limited to the bank studied; however, the approach could trigger off reflections among policy makers and other banks to start using the BSC.
عبدالرزاق المبروك عبدالله ابوفائد، (05-2017)، International Journal of Business and Management: International Journal of Business and Mana، 1 (3)، 1-14
Crashing and Energy Absorption Performance of Corrugated Composite Plate with Different Profile under Impact Loading Conditions
Journal ArticleThis paper presents the dynamic crushing performance of corrugated composite plate with different profiles. Samples of sinusoidal, square, and triangular corrugated profiles were experimentally tested. They were subjected to axial impact load. A weight of 10.5 kg have been freely dropped from a height of 1m, 2m, and 3m. The idea is to understand the effect of corrugation geometry on energy absorption performance. All specimens have been manufactured by hand lay-up technique using woven roving E-glass fabric and polyester resin with six layers. Similar specimens have been tested before under the effect of quasi-static compression load. Quasi–static testing is simpler and less expensive than dynamic testing and facilities are more readily available. Quasi–static can provide good qualitative assessment as to the trend of different variables upon energy absorption. However, for useful design data, dynamic testing is essential to determine a quantitative measure of energy absorption. Results obtained from dynamic tests conducted showed that corrugation profile has high effect on energy absorption capability. It is also observed that, specimens of square profile recorded the highest capability of energy absorption characteristics compared with sinusoidal and triangular profiles. This result came exactly in conformity with the results of quasi-static load applied on similar specimen that performed in a previous research.
الفيتوري فرج الهادي ابديوي, (05-2017), Reference Module in Materials Science and Materials Engineering (MATERIAL APPLICATIONS , PERFORMANCE AND LIFE CYCLE): Reference Module in Materials Science and Materials Engineering (MATERIAL APPLICATIONS , PERFORMANCE AND LIFE CYCLE), 8 (12), 23-30
Investigation on Mechanical Properties of Reinforcing Steel Bars Made From Recycled Scraps
Journal ArticleThe quality requirements for concrete reinforcement have increased interest in optimizing the mechanical properties of reinforcing bars used for the construction of all types of structures such as buildings, bridges and other constructions. The variability of mechanical properties of reinforcing steel bars manufactured from scrap metals by local manufacturers in Libya have been investigated in this paper. Sydee-Assayh Steel Factory (SASF) is one of the private steel factories established recently in Libya. This factory uses mainly scrap metals as raw material. This was motivated by the fact that it has been noticed that the use of the substandard reinforcing bars in construction industry could lead to collapse of the structures reinforced with these bars in many developing countries. Therefore a series of experimental tests were conducted to find mechanical properties of Sydee-Assyh Steel Factory products. Steel rods samples of 12mm and 14mm diameter were selected randomly and tested. Results found were compared with Libyan specifications (LNS-75) and ASTM standard (A-615), and found almost satisfactory.
Elfetori Faraj Alhadee Abdewi, (05-2017), Reference Module in Materials Science and Materials Engineering (MATERIAL APPLICATIONS , PERFORMANCE AND LIFE CYCLE): Reference Module in Materials Science and Materials Engineering (MATERIAL APPLICATIONS , PERFORMANCE AND LIFE CYCLE)" Elsevier publication, 3 (7), 13-19