Resonance Identification of a Journal Bearing based on Frequency Response Function and Numerical Analysis
Conference paper

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Osama Amhammeed Altaher Hassin, (08-2019), Tripoli, Libya: ICTS (MI5032) International Conference on Technology, 1-4

Determination of some physical, chemical and biological properties of groundwater in Sabratha
Conference paper

This study had been performed in Sabratha area to assign some physical, chemical and biological characteristics for underground water and to find out its propriety for drinking. The study area was divided into ten locality: Dahman, Al- Khatatba, Aljabbar, Subratha center, Soug Al-Alalgah, Aldababshiah, Alnahdah, Tillil, Altunaibat, and Aggar. Forty eight samples of underground water has been collected in the study area. Five wells from each site were chosen except in Subratha center, where three wells were chosen. After performing the necessary analysis it became clear that the total dissolved salts concentration in 93.75% of the wells exceeded the allowable limit for drinking water, the highest was found to 4444.060 PPM in Tillil area, in addition to that, it was found that 81.25% of the wells, water, exceeded the allowable limits for sulpher concentration in drinking water. It was found that the concentration of the chloride (Cl ‾) exceeded the allowable limit for drinking water in 93.75 % of the wells, and the concentration of nitrite (NO2‾) exceeded the allowable limit in 8.3 % of the wells, while the concentration of nitrate ion ( NO3‾ ), in all wells were compatible with the Libyan and International specifications. The Calcium ion (Ca+2) exceeded the allowable limit in 87.5% of the wells. We can found also that, the concentration of magnesium element (Mg) exceeded the allowable limit in 79.1% of the wells. As for the sodium (Na+) concentration, it exceeded the allowable limit for drinking water in 95.8% of the wells, the highest was recorded in Sabratha center (7782 ppm). Some of the wells were polluted from the biological aspect, that was due to the contamination by sewage waters. In this study we found that, 39.58% of the well waters were polluted and not compatible to the international and Libyan standard specifications for drinking water, while we found that 60.41% of the wells were not polluted and were compatible with the standards. From the chemical aspect we found that, the most wells in the study area were not good for drinking, especially those located to the north, since they are near the sea and they merge with sea water . We also can notice that many of the wells were not good for drinking from the biological aspect, so we recommend to perform chemical and biological analysis before using the underground waters for domestic, agricultural and industrial objectives. Key words: Underground water, chemical pollution, biological pollution, Sabratha, Libya

Al-agila Ahmed Mahmudi, Tarek Basher Jdeidi, (08-2019), University of Alhdera: Rakiza, 127-235

Climate change impact on crop evapotranspiration in Turkey during 21st century
Journal Article

Evapotranspiration calculation is an important matter due to agricultural reasons, but also for understanding water resources and runoff amount in a certain territory. Two CMIP5 multimodal projections (2011–2040 and 2041–2070) and land-cover pattern were used to analyse the seasonal and annual crop evapotranspiration trend in Turkey. The spatial distribution of crop evapotranspiration related to the initial season, mid-season, end season and cold season were computed through a geographical information system. The maximum crop evapotranspirations were found in the mid-season for present and future, with 1,072 and 1,241 mm respectively. For the future period, an increase in the spatial distribution of crop evapotranspiration was depicted in several places due to climate warming, mainly in the southern and southeastern areas of Turkey and on the Mediterranean coast. The minimum seasonal crop evapotranspirations fell to below 154 and 164 mm in the present and future respectively. The annual crop evapotranspiration increased from 1,675 to 1,944 mm from present to future and the significant values of absolute changes were identified in the western, eastern and southeastern regions of Turkey. The findings are useful for scientists in the climate, hydrology and agriculture fields, but also for management decisions.

Mostafa Ali Mohamed Benzaghta, (07-2019), Meteorological Applications: Royal Meteorological Society, 26 (3), 442-453

CFD predictions of Swirl burner aerodynamics with variable outlet configurations
Conference paper

ABSTRACT

Swirl stabilised combustion is one of the most widely used techniques for flame stabilisation in gas turbine combustors. Lean premixed combustion systems allow the reduction of NOx coupled with fair flame stability. The swirl mechanism produces an aerodynamic region known as central recirculation zone (CRZ) providing a low velocity region where the flame speed matches the flow velocity, thus anchoring the flame whilst serving to recycle heat and active chemical species to the root of the former. Another beneficial feature of the CRZ is the enhancement of the mixing in and around this region. However, the mixing and stabilisation processes inside of this zone have shown to be extremely complex. The level of swirl, burner outlet configuration and combustor expansion are very important variables that define the features of the CRZ.

Therefore, in this paper swirling flame dynamics are investigated using computational fluid dynamics (CFD) with commercial software (ANSYS). A new generic swirl burner operated under lean-premixed conditions was modelled. A variety of nozzles were analysed using several gaseous blends at a constant power output. The investigation was based on recognising the size and strength of the central recirculation zones. The dimensions and turbulence of the Central Recirculation Zone were measured and correlated to previous experiments. The results show how the strength and size of the recirculation zone are highly influenced by the blend and infer that it is governed by both the shear layer surrounding the Central Recirculation Zones (CRZ) and the gas composition

HESHAM BAEJ, (07-2019), Engineering, Physics International Journal of Energy Technology: WEENTech, 31-43

التنافس الفرنسي الإيطالي وتداعياته على ليبيا
مقال في مجلة علمية

تقدم هذه الدراسة محاولة لفهم أبعاد التنافس الدولي في ليبيا لاسيما بعد أحداث التغيير الثوري عام 2011، وذلك من خلال البحث في منطلقات وبواعث الاهتمام الفرنسي الإيطالي المتزايد حول ليبيا وآليات التنافس والتغلغل في المنطقة، اعتماداً على الآليات السياسية والعسكرية، كتجسيد لهذا الاهتمام وكتعبير عن التنافس بينهما. يبدو أن كلا القوتين في تنافس مستمر وتحرك دؤوب يندرج في إطار سياسات التنافس الدولي المتجدد على المنطقة، لفرض هيمنتها وتوسيع نفوذها من أجل تعزيز وتحقيق مصالحها.

 

وعليه، فإن احتدام شدة التنافس الفرنسي الإيطالي، إنما يعبر عن تزايد أهمية المكانة الجيوبوليتيكة التي تحظى بها ليبيا وما تمتلكه من عناصر ومقومات كثيرة تجعلها مطمعاً للآخرين، بوصفها منطقة حيوية وواعدة اقتصادياً، وهو ما قد يدفع باتجاه نمط جديد من العلاقات بين فرنسا وإيطاليا، ويجعل من ليبيا ساحة مفتوحة للتنافس والصراع الإقليمي والدولي قد تؤدي إلى مزيد من تعقيدات المشهد السياسي والأمني في ليبيا وتهدد استقرارها، خاصة وأن التنافس والصراع حول ليبيا قد أسفر عن انقسامات داخل المجتمع الليبي لا تزال تبعاتها مستمرة حتى الآن .


الكلمات المفتاحية: التنافس، الأبعاد الاقتصادية والإستراتيجية، فرنسا، إيطاليا، ليبيا


محمد عبدالحفيظ المهدي الشيخ، (06-2019)، بيروت، لبنان: مجلة المستقبل العربي، 484 (2019)، 135-147

Wild mammals in northwestern Libya and the role of rain and temperature in its geographical distribution
مقال في مجلة علمية

This study was conducted on mammals in the western part of the Jafara Plain and on its relationship to environmental factors, such as temperature and rainfall. This study included two parts; the first part is a field study to identify the species of wild mammals in the western part of the Jafara plain and to determine its geographical distribution. The second part of this study included analyzing data of average annual rainfall and average annual temperatures, using the regression equation and the quintile equation for eight urban areas within the region during thirty years, from 1977 to 2006 due to the availability of temperature and precipitation data in this period. The results showed that there are nineteen species of wild mammals in this region belonging to ten families of six orders. The most recorded species belong to the order of rodents (47%) followed by the order of carnivores (26%), then insectivores (10%). Results of environmental changes showed that, the trend in all studied areas was negative and that the amounts of rain were fluctuating, unstable and decreased at a rate between 40 - 125 mm during the thirty years. As for the temperature, it rose during this period between 1.5oC to 2oC. Therefore, it became clear that the change in environmental factors caused an increase in the rate of drought, and this is what threatens the natural vegetation and thus threatens all other organisms, especially wild mammals, which their numbers were few in the driest places on the plain of Jafara. Key words: Mammals, Biodiversity, Temperature, Rain, Libya.

Hamed Basher Bsissa، Mohamed aiysal Ashur، Tarek Basher Jdeidi، (06-2019)، Tripoli University, Libyas: The Libyan Journal of Science (An International Journal):، 22 (1)، 27-44

Post Weld Heat Treatment Qualification of Type 304L Stainless Steel Weld Metal
Conference paper


. The aim of the present paper is focused on post weld heat treatment qualification by

describes the results of an investigation to understand the micro structural changes that taken place in type 304L stainless steel weld deposits as function of temperature / time by showing any presence of re-crystallization and / or strain induced grain boundary migration and the dissolution of any carbide formed at grain boundaries in welding monitored by metallographic examination.

Abdulnaser Hamza Ahmed Fadel, (03-2019), Libya: International Conference on Technical Sciences, 1131-1134

Biomarker Ratios and Stablecarbon Isotopes to Describe Crude Oils Characteristics in the Murzuq Basin (Libya)
Journal Article

This present paper includes a detailed evaluation of specific biomarkers together with stable carbon isotope (δ13C) by gas chromatography-mass spectrometry (GC–MS) and Gas Chromatograph– Isotope Ratio Mass Spectrometry (GC–IR–MS). Eight crude oil samples were collected from the A, B, H (east) and H (west) Fields, located in the Murzuq Basin, Libya. Stable Carbon isotope data (δ13C) together with biomarker ratios data of individual hydrocarbons, n-alkanes, isoprenoids, terpenes, hopanes, steranes and aromatic have been determined in crude oils to delineate their bacterial degradation, source facies, organic matter precursors, depositional conditions and a variation of maturation. Based on source-specific parameters including n-C19 alkane, % C27S, %C28S, %C29S, %C23TT, %C30αβ, %rC28, DBT/P, CPI, Pr/Ph, Ts/Tm, dh 30/h 30, 1 MN, 2 MN, 26-27 DMN, 15 DMN, 236 TMN, 146-135 TMN, 125 TMN, 136 TMN ratios and δ13C‰ of saturates and aromatics fractions. Such oils showed non-biodegradation, n-C19 peak proved oils generated from a Lower Palaeozoic source rocks as emphasizedvian-C19 peak, the dominance of C29steranes

over C27 and C28 with light Carbon isotope ratio (δ13C‰) values. The abundances of isosterane C29, C27, C28.Tricyclohexaprenol and bacteriohopane polyols and aminopolyols, recommended as mixture bioprecursors of tricyclic terpenes and hopanes, furthermore regular sterane ratio gives values characteristic of Lower Palaeozoic marine source rocks and holding green algae and most likely a quantity of contribution from acritarchs. Carbon preference indices (CPIs)>0.9 pointed to an anoxic deposition, dibenzothiophene to phenanthrene (DBT/Prange 0.49 - 0.58) recommend a siliciclastic source rather than carbonate and/or evaporate saline deposition. The ratios of CPIs, pristane/n-C17 and phytane/n-C18, n-alkanes (C16 to C22) against (C23 to C33), Ts/Tm, C30diahopane/C30hopane, methylnaphthalene, dimethyl naphthalene and trimethyl naphthalene indicated that the oils analysed are mature except the B Field oil being slightly less mature than the A, H (east) and H (west) Fields oils

S. Aboglila1*, A. Abdulgader1 , A. Albaghdady1 , O. Hlal1 and E. Farifr1, (03-2019), Advances in Research: Advances in Research, 18 (3), 1-12

التمويل بالمشاركة وأثرها على الاداء المالي للمصارف الاسلامية ( دراسة حالة بنك فيصل السوداني )
مقال في مجلة علمية

هدفت الدراسة الي بيان أثر التمويل بالمشاركة على الاداء المالي للمصارف الاسلامية؛ حيث طبقت هذه الدراسة على بنك فيصل الاسلامس السوداني خلال الفترة الزمنية (2009-2019).

حيث توصلت الدراسة لعدة نتائج من اهمها انه يوجد أثر ذو دلالة إحصائية للتمويل بالمشاركة على نسب السيولة وكذلك على نسب الربحية في بنك فيصل الاسلامي السوداني ووجود اثر ذو دلالة إحصائية للتمويل بالمشاركة على رلحية السهم العادي.

سمير حسين موسي، شرف الدين خليل البي، (03-2019)، طرابلس /ليبيا: دراسات محاسبية، 3 (3)، 265-296

صورة الاسلام في الاعلام الغربي
Journal Article

 



Almarzouqi Ali AlHadi Almarzouqi, (03-2019), جامعة الزاوية: مجلة كليات التربية, 7 (7), 14-34