المنشورات العلمية لـجامعة طرابلس

احصائيات منشورات جامعة طرابلس

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    مقال في مؤتمر علمي

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    مقال في مجلة علمية

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    كتاب

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    فصل من كتاب

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    رسالة دكتوراة

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    رسالة ماجستير

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    مشروع تخرج بكالوريوس

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    تقرير علمي

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    عمل غير منشور

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    وثيقة

Characteristics of HQ Tube for Turbofan Engines

Abstract

The contribution of this thesis is to improve the understanding of acoustic dynamics in the audio duct with HQ (Herschel-Quincke tube) is essentially a hollow side-tube that travels along a main-duct axis and attaches to the main-duct at each of the two ends of the tube. In this project the detailed measurements of acoustic in a duct with HQ induced by a loudspeaker at various frequencies have been carried out experimentally. Two microphones have been used to measure the net acoustic power transmission in the duct downstream of HQ and compared with the net acoustic power transmission in the duct without the HQ. Two types of HQ and three different ducts have been studied. The acoustic wave signals are traveling in the duct as a plane wave these waves are generated by a signal generating system with a known sinusoidal wave (sine wave). One of the microphones is located just before the HQ-duct interface and the other microphone after the HQ in the duct. Labview software is used to analyze the signals with a sampling rate of 44100s/sam and number of samples is 20000. This study makes an exhaustive understanding of power spectrum of two acoustic channels in the duct with and without HQ. The results show that there is a great potential for HQ tube system to attenuate the noise over conical and cylindrical sections. The sound attenuation on conical section with short HQ shows about 70% and that of cylindrical section a meager 47% at higher frequency. Further more the sound attenuation of cylindrical section with long HQ is occurred at low frequencies.
رضوان نجمي الكوني الشريف (2010)

Application of Adaptive Control Using Neural Networks In On Line of Real Time Control Systems

Abstract

The dynamic model of the heat process trainer PT326 is obtained experimentally by using the Ziegler–Nichols approximation and the system identification MATLAB toolbox. The interfacing data acquisition card is developed in two different designs the first design by using analog to digital, digital to analog IC's (ADC and DAC) and the parallel port, and the other design by using microcontroller and serial port. These two designs were tested in the department and give good results. The velocity PID controller is implemented through the developed cards in real time control system. An adapted neural network algorithm using the backpropagation approximation is tested on real time in the heat process trainer PT326. This research gives a good background for any control and computer engineer in the area of data acquisition and real time control system. The simulation results are the same as the online results of the real time Heat process control system.
نوري احمد عقاب (2010)

Creation of Wind Velocity Contour Map to Calculate Design Wind Velocity for Libya

Abstract

The new trend of development in Libya is building a more high rise buildings (tall buildings) in dense populated cities like Tripoli to limit the horizontal expansion of the cities.Therefore, an accurate estimation of wind load is an important factor for the design of such tall buildings.This research examines the effects of wind on the design of buildings, and explaining wind types dominating territory. The thesis main focus is analysing the wind data collected from 22 meteorological stations distributed around the country.The wind data analysis is carried out by using a probability distribution model that created an estimation of the design wind speed with a return period of 50 – year for each city’s station.The established wind speed is then used to create a design wind speed contour map for the entire country using special software.
محمد بشير أبوهدامة (2009)

Petrophysical Study of the Nubian Sandstones in Concession 59D, E. Sirt Basin, Libya

Abstract

The Nubian Sandstone Formation is a significant hydrocarbon reservoir in the Concession 59D, Eastern Sirt Basin, Libya. This formation is underlain uncomfortably by granitic basement and/or by the Hercynian unconformity and overlain uncomfortably by Pre-Upper Cretaceous followed by an Early Upper Cretaceous Transition beds. The Nubian formation is a thick sequence comprises mainly of sandstone, siltstone and shale.The Nubian Formation in this area has been subdivided into three stratigraphic members; namely Lower Sandstone, Middle Shale and Upper Sandstone (main reservoir well be focus of this study).The Upper Sandstone is the upper most subdivision of the Nubian Sandstone sequence consists mainly of white, grey to brown sandstones, ranging from fine to medium, locally coarse grained, moderately cemented with straight to concavo convex or slightly sutured grain contacts. This reservoir is a complex of fluvial sands deposited in Braided and Meandering streams.The reservoir fluids are very rich retrograde condensate gas and waxy oil with pressure at slightly above the saturation pressure. Most of this hydrocarbon in this reservoir has been sourced from the Nubian Middle Shale Member, but the Upper Cretaceous shale and Evaporates belonging to the Transition beds sequence have a significant potential source. The trapping mechanism in the field is a combined structural and stratigraphic trap for the Nubian Sandstone with the southern closure against the tight Nubian facies and basement of the Gialo High. Reservoir properties across the North Gialo Study Area vary in terms of porosity, permeability fluid saturation. These variations are indicated through the porosity, permeability and saturation maps and charts based on well log analysis and lab core sample measurements. These properties are discussed in the reservoir characterization part of this thesis.
عواطف عبد الله بودربالة (2012)

Sedimentological and Petrophysical Characterization of Nubian Sandstone; of the Sarir Field, Sirte Basin

Abstract

The Nubian Sandstone of Lawer Cretaceous Formation is located in Sarir Oil Field, in the Southeastern Sirte Basin in Libya. After conductiog 300 point counts on 24 thin sections from C4 -65&C3 -65. The deposition environment and diagenesis that affected the variability of porosity and permeability within a given lithologic unit. I found the Nubian Sandstone bodies of Sarir-C-North can also be divided on the basis of grian size and sedimentary structure into type: - 1) medium to coarse- grained sandstone 2) very fine grains sandstone. Association in the former lithologic, the siltstone and silty sandstone are grey and usually laminated; while in the latter they form white-grey or reddish siltstone and shaly siltstone beds, commonly intensively burrowed, and locally contain fragments of coal. A different depositional environment deposited each lithology. The Nubian Sandstone is interpreted to include several lithofacies deposited in fluvial environment. It informal these facies controlled both the primary porosity and diagenetic events. Peterophysical properties of formation under study were determined using different well logs. Porosities are calculated using sonic, neutron, and density logs. It is clear that the primary porosity in (well C3 -65) of formation represents dominant one and the secondary is (well C4- 65) of rare.
ليلي المبروك (2008)

The Impact of Mixed Multirate ServicesOn Uplink Capacity -Coverage Product inWCDMA Mobile Networks

Abstract

The number of mobile service users has been tremendously increased during the last few years, and the types of mobile services are developed from pure voice to data and multimedia services, such as audio/video streaming, e-mail, file transfer, and web browsing. These services have quite different requirements for their quality. 3G WCDMA cellular mobile networks answer this growing demand for these wireless data services. Then it needs to provide a huge capacity and wide area of coverage with acceptable quality of service. Capacity and coverage in WCDMA networks planning are the important issues because they are dependent of each other and related to the services data rate. In this thesis the capacity and coverage of mixed rate services are derived and analyzed. The uplink Capacity Coverage Product (CCP) of mixed rate services is developed by two methods, and three scenarios are assumed. The first method is the exact solution and the second method is the approximate solution. Math lap computer programs are used to get results and curves. Then some parameters affecting the mixed rate CCP are studied and a comparison between the two methods is also performed.The application of CCP in dimensioning and planning of a single service and mixed rate services WCDMA network is presented. A comparison with the conventional planning method is performed.
علي صالح منصور (2008)

إعداد وتحضير وتقييم النشاء العشبي كمادة مضافة للشكل الدوائي الصلب

Abstract

The objective of the study is to find a substitute for corn starch and find various options for pharmaceutical industry.Three types of grains were used which were “Hordeum vulgare “Barlay., Orchis mascula” Salep” pannistum americanum “ Pearl millet” starch was extracted from the grains and their disintegration time was measured.Physiochemical screening were used for determining the total value, moisture, protein, fat, fiber, pH, melting point, loss on drying, optical rotation, I.R, solubility, organoleptic evaluation, microbial contamination, swelling index, content of .rbohydrate.Pharmaceutical evaluation was used for determine bulk density, tapped density, average diameter and particle size distribution, starch powder flow properties “angle repose, Hausner’s ratio and cars index. The powder was transformed into granules with the usage of super disintegrant (poly vinyl pyrolidin P.V.P) for many concentrations, the pharmaceutical evaluations above-mentioned were used to measure the disintegration time, and the best result was 7.5% of (P.V.P), this concentration was used in the other formulas. The objective of the study is to find a substitute for corn starch and find various options for pharmaceutical industry. Three types of grains were used which were “Hordeum vulgare “Barlay., Orchis mascula” Salep” pannistum americanum “ Pearl millet” starch was extracted from the grains and their disintegration time was measured.Physiochemical screening were used for determining the total value, moisture, protein, fat, fiber, pH, melting point, loss on drying, optical rotation, I.R, solubility, organoleptic evaluation, microbial contamination, swelling index, content of carbohydrate.Pharmaceutical evaluation was used for determine bulk density, tapped density, average diameter and particle size distribution, starch powder flow properties “angle repose, Hausner’s ratio and cars index.The powder was transformed into granules with the usage of super disintegrant (poly vinyl pyrolidin P.V.P) for many concentrations, the pharmaceutical evaluations above-mentioned were used to measure the disintegration time, and the best result was 7.5% of (P.V.P), this concentration was used in the other formulas. The granules were pressed into tablets by the usage of Apress of 15KN in order to determine the disintegration time. The granules were prepared by wet and dry granulation techniques. The concentrations of the starch were (3%, 9%). Then they were evaluated by pharmaceutical evaluations previously mentioned.The granule was transformed into tablets weight variation, thickness, hardness and disintegration times were determined. From the study results, we noticed that the results of the physiochemical screening are similar to the parameters of Syrian Arab Organization and Metrology. The results revealed the contamination of the starch because of its hygroscopic nature.The results of the wet granulation method was better than dry granulation method and the results of pharmaceutical evaluation were acceptable.The sample with the largest particle size the shortest disintegration time, decrease the concentration of starch lead to rapid penetration of water and an increase in disintegration time.The result of dissolution test was good within the limit of British pharmacopeia
بثينة يوسف مهنى (2016)

Dielectric Relaxation and Dipole Moments of Four Hydrogen Bonded Heterocyclic Compounds in Chloroform

Abstract

The permittivities and dielectric losses of 2-Piperedone, -Caprolactam, 2-Azacyclooctanone and 2-Azacyclononanone have been studied in chloroform solutions. They have been measured using Q meter at frequency range 150KHz to 15MHz.Both 2-Piperedone and -Caprolactam solutions were studied at concentration range 0.05 to 0.25M and over temperatures range of -10 to 45 and. The dielectric studies of 2-Azacyclooctanone solutions cover a concentration range 0.05 to 0.125M and over temperature range of -10 to 45, while that of 2-Azacyclononanone solutions were studied at concentration range 0.01 to 0.075M and over temperature range of -10 to 45. The permittivities at higher concentrated solutions up to 1.5M of 2-Pipere-done, -Caprolactam and 2-Azacyclononanone were also measured at 2MHz using dipole meter DM01 over the temperature rang -10 to 45.The static permittivities for the four systems were discussed as the affect concentration, temperature and the number of CH2 group in the cyclic amides. All show normal behaviour except that the CH2 does not show clear affect. Single relaxation process were observed for the studied compound in the chloroform solutions ( =10-9 sec). All cases, the presence of a relaxation process was established at frequencies higher than used here. These relaxation processes were discussed in terms of their relation to concentration and the number of CH2 group. The dielectric activation energies were calculated using Eyring equation. The obtained values were discussed also in terms of concentration affect. A dependence of on concentration was observed. The dipole moments for the four studied compounds in solutions were evaluated using of Cole-Cole a semicircle plots, which considered to be associated with the relaxation process and other dipole moments were evaluated using =. This was assigned as an apparent dipole moment. All these dipole moments were discussed in terms of concentration and temperature affect. The obtained dipole moments in all studied case were much larger than those expected for planer dimers association. So they assigned to the presence of dimers and trimer or tetramers association in the studied solutions.Kirkwood correlation factor for the studied systems were calculated and discussed as a function of concentration. All values of g are less than unity and were assigned to a cyclic association form.
لطفية صادق حسن المجدوب (2010)