استخدام المواد المركبة في التطبيقات الصناعية نمى بشكل سريع وذلك لمميزاته المناسبة التي تشمل ارتفاع نسب المقاومة والمتانة بالنسبة للوزن , وقد أصبحت المواد المركبة بديل المواد المعدنية في العديد من التطبيقات. المواد الثيرموبلاستيكية المركبة تم دراستها في هذه الرسالة حيث استعمل البولي اثيلين كقالب ودعم بإضافة ألياف الزجاج بنسب مختلفة ( 10% , 20% , 30% ) , وتم دراسة تأثير إضافة ألياف الزجاج على الخواص الميكانيكية للعينات. تم الحصول على العينات المركبة باستخدام جهاز البثق وإجراء التجارب لتقيم جريان المنصهر عند درجات الحرارة العالية حيث لاحظنا زيادة الجريان بزيادة الضغط . كما تم تطوير علاقات رياضية لتمثيل علاقات الإجهاد – الانفعال للعينات المركبة المتحصل عليها ,تم الحصول على ثوابت هذه العلاقات الرياضية. كما تم دراسة علاقات زمن الانهيارات للعينات المركبة , وتم تحسين طاقة الكسر للمواد المركبة التي تؤخر من ظاهرة الانهيار. إضافة ألياف الزجاج أدى إلى زيادة زمن الانهيار وتقليل طاقة الكسر. Abstract The use of composite materials in industry applications has grown rapidly, owing to their favorable characteristics, including high strength and stiffness to weight ratios, composite materials have been considered replacement of metals in numerous structural applications.Thermoplastic composite was studied in this thesis where high density polyethylene is used as a matrix and reinforced with different percentages of fiber glass ranging from (10%, 20%, 30%). The influence of addition of fibreglass on mechanical and thermal properties was studied. A pilot plant extruder is used to prepare the needed samples, where experimental investigation is carried out to evaluate the melt flow and the impact behaviour of the melt mixture at high temperature in the extruder. The flow rate increased by increased pressure. A mathematical correlation was developed to represent the stress – strain correlations of the composites used in this work. The combined model would be able to predict the creep, relaxation and recovery of composite materials, the constants of the model was obtained in area where the retardation effect is dominating. Time to failure correlation with stress was studied for the prepared composite material and mathematical correlation is established. The energy absorbed at fracture is improved for the composite material leading to a considerable delay in failure phenomenon. When added fibreglass led to increase time to failure and decrease energy of fracture.
ابتسام خليفة ابولجام (2008)

Abstract Here asphaltene precipitation in petroleum reservoirs during natural depletion and miscible gas injection is modeled for two distinct and new methods (polymer solution and Scott-Magat theory). The first model is based on the polymer solution theory, which is a combination of Miller's combinatorial term with a modified residual term of the original Flory-Huggins theory. The second one is based on the Scott Magat theory to represent solid-liquid equilibria. The models has also been coupled with Peng Robinson equation of state (PR EOS) to describe the phase behavior of asphaltene compounds in crude oil and predict the amount of asphaltene precipitation during injection of carbon dioxide for the miscible displacement of asphaltic crudes. The model treats asphaltene within crude oil as a single pseudocomponent represented by an average molecular weight and molar volume and solubility parameter . The results of both models show an acceptable and good agreement between the real data (field and experimental) and those of the models. As it can be seen from the obtained results of those of the two models, it seems that application of the lattice or polymer solution theories (based on The Miller's combinatorial term) could give better results that are more close to real data.
وداد بلعيد حميدات (2009)

Abstract 1. The experimental viscosities densities measured with Anton Paar SVM 3000 equipment, and refractive indices measured with Refractive Meter equipment, corresponding values of excess molar volumes (VE ), deviations in viscosity (Δμ), deviations in refractive index (ΔnD), excess Gibbs energy (GE), and excess molar enthalpy (HE), for binary, ternary and fourth mixtures of alcohol, ether, and n-alkanes. 2.Used for the calibration experimental from paper [7] were the mixture for the binary system (tert butyl alcohol + ethanol ), we had good result and ADD% for densities, viscosities and refractive indices were 0.1657 %, 0.4846 %, and 0.033545 % respectively. 3.Data of binary mixture were fitted to a Redlich-Kister's The choice of the proper number of coefficients (p), was based on the standard deviations, and the F-test as criterion of goodness with an error lower that 1% see. 4.Data of ternary and fourth mixture were correlated by Cibulka equation were determined with the optimization algorithm similar to that for the binary parameters the σ values was less than 0.05%. 5.The experimental viscosities densities and refractive indices were positive and decrease with increase temperature for all tables for binary ternary and fourth mixtures. 6.Excess molar volumes (VE), was negative value for all binary system, Deviations in viscosity (∆µ), negative value, but at system (n-hexane + n-heptane), maximum positive and minimum with negative value, Deviations in Refractive Index (ΔnD), was were positive for all binary mixtures, Excess Gibbs Energy was negative for all binary ,but maximum positive and minimum with negative value just at system (n-hexane + n-heptane). 7.Excess properties for ternary mixture negative and positive value. 8.Excess properties for fourth mixture negative value.
سهير المبروك دربال (2009)