Pavement Rutting Prediction Model based on the Long Term Pavement Performance Data
Conference paperVarious types of pavement deterioration can affect pavement performance, including rutting,
which causes safety and service quality problems on the highways. Rutting, often referred to as
permanent deformation of a pavement surface, causes longitudinal depressions creating
channels in wheel paths. There are many in-service pavement performance databases, but the
Long Term Pavement Performance database (LTTP) is the largest of its kind in the world. It
encompasses data from four different climate zones in North America. Data on flexible
pavements from only the dry freeze zone was included in the scope of the study reported herein.
Regression analysis was performed to develop a rutting model. The proposed model indicates
that the voids in the mineral aggregate (VMA) of hot mixed asphalt is the most important factor
and the positive values of the regression coefficient of VMA implies that rut depth increases
when VMA increases. The other important factors in this model are Marshall stiffness and
freeze index. The negative values of the regression coefficients of Marshall stiffness and freeze
index indicates that the rut depth will decrease when the Marshall stiffness and freeze index
increase.
Asmaiel Kodan Ali Naiel, (06-2011), , Zürich: ISEC, 1-6
The significance of 24-norcholestanes, 4-methylsteranes and dinosteranes in oils and source-rocks from East Sirte Basin (Libya)
Journal ArticleThe present paper involves a detailed evaluation of specific steroid biomarkers by gas chromatography– mass spectrometry (GC–MS) and GC-metastable reaction monitoring (MRM) analyses of several crude oils and source rocks from the East Sirte Basin. 24-Norcholestanes, dinosteranes, 4a-methyl-24-ethylcholestanes and triaromatic steroids have been identified in both source-rocks and crude oils of the East Sirte Basin. Diatoms, dinoflagellates (including those potentially associated with corals) and/or their direct ancestors are amongst the proposed sources of these biomarkers. These biomarker parameters have been used to establish a Mesozoic oil–source correlation of the East Sirte Basin. Hydropyrolysis of an extant coral extract revealed a similar distribution (although immature) of dinosteranes and 4a-methyl-24-ethylcholestanes also observed in the Sirte oils and source-rocks. This is consistent with the presence of dinoflagellates present during the deposition of the Mesozoic aged East Sirte Basin Formations. A good data correlation for the rock extracts revealed a similar distribution of 3,24-dimethyl triaromatic steroids, 3-methyl-24-ethylcholestanes, 4-methyl-24-ethylcholestanes and 2-methyl-24-ethylcholestanes observed in one of the oil families and associated source-rocks for the East Sirte Basin.
S. Aboglila, K. Grice, (05-2011), Elsevier: Applied Geochemistry, 16 (1), 1694-1705
Production of Digital Climatic Maps Using Geostatistical Techniques (Ordinary Kriging) Case Study from Libya
Journal ArticleAbdussalam Ahmed Mohmed Ibrahim, (04-2011), PSIPW: International Journal of Water Resources and Arid Environments, 1 (4), 239-250
Current Challenges and Future Perspective: The Influence of Organizational Intelligence on Libyan Oil and Gas Industry
Journal ArticleHadya Soliman Hadya Hawedi, (01-2011), IJCSNS International Journal of Computer Science and Network Security: IJCSNS, 1 (11), 145-147
Poly (benzoxazine-co-urethane) s: A new concept for phenolic/urethane copolymers via one-pot method
Journal ArticleHistorically, applications for traditional phenolic resin/polyurethane materials are limited due to the inherently weak thermal stability of urethane-phenolic linkage and slow reaction rate. A novel concept has been developed to produce phenolic resin/polyurethane copolymers ...
Mohamed Saad Saad Baqar, (01-2011), Polymer: Elsevier, 52 (2), 307-317
Effect of neighboring groups on enhancing benzoxazine autocatalytic polymerization
ChapterThe unique features of polybenzoxazines make them attractive for a wide range of applications. The characteristics of polybenzoxazines such as excellent dimensional stability, lower surface energy, higher Tg, and lower moisture absorption are attributed to the stable intramolecular hydrogen bonding in their network structure. The features make polybenzoxazines excellent candidates for the applications that require near zero shrinkage and high dimensional stability. Polybenzoxazines are formed by the autocatalytic polymerization of benzoxazine monomers. Polybenzoxazines are well known as a new class of thermoset polymers used for high performance applications. They provide the characteristic properties found in phenolic resins, such as high thermal stability, excellent electrical properties, good mechanical properties, and better flame retardancy. Furthermore, they have the advantages …
Mohamed Saad Saad Baqar, (01-2011), Handbook of Benzoxazine Resins: Elsevier, 193-210
English and Arabic Vowels: A comparative study of vowel quality and duration
Journal ArticleThis study is a comparison between English and Arabic vowels. First a description and classification of vowels in the two languages is given. Then the two sets of vowels are contrasted to find which vowels are similar and which are not. Finally, the set of similar sounds are analysed acoustically to find out to what extent they are similar. This is done by recording two sets of words containing these vowels and measuring their formants and duration. The findings show that although these sounds are similar in some aspects, Arab learners of English do not replace English vowels with their Arabic counterparts but, instead they try to reach the target sounds even though they are not completely successful in achieving their goal.
Albashir Ahmed, (12-2010), University Bulletin: Zawia University, 12 (2010), 45-70
Tripolitanian Arabic: An investigation in the phonology of the dialect spoken in the city of Tripoli-Libya
Journal ArticleIn the introduction of this paper the aims, the subject and its importance are briefly stated. However, the paper consists of two main parts. The first part deals with the segmental phonology of Tripolitanian Arabic and this includes classification of both vowels and consonants and relevant features such allophonic variation, length, geminating and clusters. The second part, on the other hand, deals with the suprasegmental level of the dialect and in which its syllable structure and stress pattern are discussed. In the conclusion, the findings of the research are summarised and some recommendations for further research are given.
Albashir Ahmed, (12-2010), News Pulletin: Zawia University, 0
Use of biomarker distributions and compound specific isotopes of carbon and hydrogen to delineate hydrocarbon characteristics in the East Sirte Basin (Libya)
Journal ArticleBiomarker ratios, together with stable carbon (d13C) and hydrogen (dD) isotopic compositions of individual hydrocarbons have been determined in a suite of crude oils (n = 24) from the East Sirte Basin to delineate their sources and respective thermal maturity. The crude oil samples are divided into two main families (A and B) based on differences in source inputs and thermal maturity. Using source specific parameters including pristane/phytane (Pr/Ph), hopane/sterane, dibenzothiophene/ phenanthrene (DBT/P), Pr/n-C17 and Ph/n-Cl8 ratios and the distributions of tricyclic and tetracyclic terpanes, family B oils are ascribed a marine source rock deposited under sub-oxic conditions, while family A oils have a more terrigenous source affinity. This genetic classification is supported by the stable carbon isotopic compositions (d13C) of the n-alkanes. Using biomarker maturity parameters such as the abundance of Pr and Ph relative to n-alkanes and the distribution of sterane and hopane isomers, family A oils are shown to be more thermally mature than family B oils. The contrasting maturity of the two families is supported by differences between the stable hydrogen isotopic compositions (dD) of Pr and Ph and the n-alkanes, as well as the d13C values of n-alkanes in their respective oils.
Salem Abdulghani Omar Aboglila, K. Grice, (08-2010), Elsevier: Organic Geochemistry, 14 (1), 1249-1258
الاتجاهات الفنية في الشعر الليبي الحديث
كتابيهدف هذا الكتاب إلى رفع الظلم والتجني عن الشعر الليبي الحديث ويسعى لإنصاف الشعراء الليبيين كل حسب اتجاهه وقد جاء الكتاب في خمسة فصول تحدث الفصل الأول عن الاتجاه الكلاسيكي والفصل الثاني عن الاتجاه الرومانسي والفصل الثالث عن الاتجاه الواقعي والفصل الرابع عن الاتجاه الرمزي والفصل الخامس عن الاتجاه الوجودي وخُتم بملحق لتراجم الشعراء .
فتحي رمضان خليفة القراضي، (08-2010)، بيروت: جامعة الزاوية،