المنشورات العلمية لـجامعة طرابلس

احصائيات منشورات جامعة طرابلس

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    وثيقة

Small ruminant contribution in meat production in Libya

Egyptian Journal of sheep & Goat Sciences Vol. 10, (1) P: 13-18 – 2015 Small ruminant contribution in meat production in Libya Abdulkarim Ahtash Abstract: Sheep and Goat are considered the important agriculture activity overall grazing areas in Libya, since natural range represent the important parts of feed and forages for those animals. Barbary sheep and local goats breeds proved their potentiality through ability to withstand the adverse conditions such as drought, sub- maintenance feeding, heat stress, disease and poor management. Libyan Barbary sheep represents the dominant Libyan sheep breed (95%) in which their population is 6.5 million heads raised for meat and wool production. Local goats (Mahali) represents more than 90% of the number of goats in Libya (1.5 – 2.0 million). Sheep and goat flocks were spread overall the country specially the coast. Extensive production system was the main system used at semi-arid grazing area and mountain. Statistics showed that sheep and goat contribution of meat production during 1998-2009 ranged from 67 – 80.5%. It looks that Libya does not reach self-sufficient of meat production from small ruminants though the wide spread of these animals. It has recognized that production deficiency percentages from sheep and goats’ meat ranged from 49% to 55% during the same period. Key words: small ruminant, meat production, self-sufficient. arabic 7 English 48
Abdulkarim Ahtash(4-2015)
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Calculation of the emission power distribution of microstructured OLEDs using the reciprocity theorem

Integrating photonic microstructures into organic light-emitting diodes (OLEDs) has been a widely used strategy to improve their light out-coupling efficiency. However, there is still a need for optical modelling methods which quantitatively characterise the spatial emission pattern of microstructured OLEDs. In this paper, we demonstrate such rigorous calculation using the reciprocity theorem. The calculation of the emission intensity at each direction in the far field can be simplified into only two simple calculations of an incident plane wave propagating from the far field into a single cell of the periodic structure. The emission from microstructured OLED devices with three different grating periods was calculated as a test of the approach, and the calculated results were in good agreement with experiment. This optical modelling method is a useful calculation tool to investigate and control the spatial emission pattern of microstructured OLEDs. arabic 12 English 89
Adel Diyaf, Emiliano R. Martins, John I.B. Wilson, Shuyu Zhang(7-2015)
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A preliminary investigation into hybrid photovoltaic cells with organic phthalocyanines and amorphous silicon heterojunction

Hybrid photovoltaic cells take the advantages of silicon in charge carrier separation and transport and organic dyes in strong complementary light absorption. Photovoltaic responses from a set of hybrid solar cells based on amorphous silicon and phthalocyanine dyes of double- or triple-layer heterojunction structures were investigated, which were found to have thickness dependence with the organic active layers. It was found that the photocurrent contributions from organic layers are limited, although they are strong light absorbers. The main photocurrent contributions are from the silicon counterpart arabic 13 English 111
Adel Diyaf, Helena Lind, John Wilson, Zhiqun He(4-2015)
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Simulation of Electromagnetic Waves in Free Space

In this paper, considers a solution of Maxwell's curl equations by using the finite-difference time-domain (FDTD) method. We simulated electromagnetic waves propagation in free space. The electric and magnetic fields generated in two cases to make a comparison between the models. All models were computed using the same parameters. This study showed that the intensities of the fields affected when adding three excited sources pointed in three locations. However, it was noted that three sources placed in the same location improved the distributions of the fields. Therefore, this difference in excitation position leads to change the image intensity distribution. arabic 6 English 43
Adel G A Diyaf, Saideg Farhat(4-2017)
موقع المنشور

Inorganic Thin Film Materials for Solar Cell Applications

Due to the global concerns on the depletion of fossil fuels and the negative effect of their use in environmental pollution and climate change, renewable energy resources are increasingly in demand. Global solar power generation has almost doubled during the last 2 years with countries, such as China, leading the way with huge investments. The first generation of solar cells are either single or multi crystalline silicon, and still have 59% market share; the second (amorphous silicon, copper indium gallium selenide, and cadmium telluride) is approaching in terms of cost and efficiency; and the third (dye sensitized solar cells, organic photovoltaic, quantum dots, and perovskite) all show promise yet are still to come to market. However, future solar cells (using copper oxide and zinc oxide) featuring the regular intrusion of one junction layer into the other in order to massively improve junction contact area are of particular promise. arabic 8 English 50
Adel Diyaf, Frank Placido, Des Robert Gibson, A. Alaswad, Yahya Alajlani(1-2018)
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Modeling effects of outlet nozzle geometry on swirling flows in gas turbine

Swirl stabilised combustion is one of the most successful technologies 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. The complex fluid dynamics and lean conditions pose a problem for stabilization of the flame. The problem is even more acute when alternative fuels are used for flexible operation. 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 isothermal case to recognize the the behavers of swirl . 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 both the shear layer surrounding the Central Recirculation Zones (CRZ) and outlet configurations. arabic 11 English 64
Hesham Baej, Adel Diyaf, Salem Adeilla, Abdurahman Kraie, Adel Akair(9-2018)
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Growth techniques of strained germanium hetero-structures for electronics applications

Growth techniques of strained germanium hetero-structures for electronics applications arabic 11 English 77
Adel Diyaf, A Hassan (1-2019)
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Knowledge, Attitude and Practice of Smoking among Pharmacy Students: Findings from a Public University

Introduction: Smoking causes substantial preventable morbidity, mortality and financial burdens. It is the main risk factor for many diseases and a significant cause of death. Smoking prevalence is high internationally and in Malaysia, especially among males. Smoking cessation is essential to reduce tobacco-related morbidity and mortality. Aim: To evaluate knowledge, attitude towards and practice of smoking among pharmacy students in the International Islamic University Malaysia (IIUM). Materials and Methods: A cross-sectional study was conducted using a validated structured self-administered questionnaire among a sample of IIUM pharmacy students (n=251) from November 2012 to December 2012. Descriptive and inferential statistics were used to summarise data and to examine the relationship between variables. Results: A total of 251 IIUM pharmacy students have participated in the survey. The median age of the participants was 21-23 years; 23.9% of them were males and 76.1% were females. The percentage of current smokers and ex-smokers was 0.4%, 0.8%, respectively. About 43% of the respondents had a good knowledge (score >16), more than half of them had a positive attitude (score >17), and about 38.4% had a good practice (score >11). Conclusion: Smoking prevalence among pharmacy students in IIUM is very low. However, conducting training and educational programs to improve knowledge, attitudes and practice of pharmacy students is highly recommended to assist their contribution to smoking cessation interventions in the future. arabic 15 English 87
Eman Ali .M Dyab(12-2018)
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