Digital Repository for faculty of Engineering

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    Patent

Interlaminar stress analysis in curvilinear laminated structure using finite element method

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Ramadan A. Al-madani , ٍSaleh R. Abdussalam Gashoot(4-2007)

Development of engineering education institutions in Libya and its importance in the overall development

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Saleh R. Abdussalam Gashoot , Aisa, S. Jadi(9-2003)

Degradation of endocrine disrupting compounds by ozonein synthetic water

In this research paper, ozone technology is used to eliminate pollutants in water and in wastewater treatment processes. The ozone reactions with the endocrine disrupters were studied at different gas flow rates, initial concentrations of endocrine disrupters, ozone concentrations and pH. The degradation of 17β-estradiol (E2) as single compound was the fastest reaching about 90% removal in almost 5 minutes. However, estrone (E1) degradation was the lowest reaching about 70% removal at the same time. The degradation of mixtures of the endocrine disruptors was found to proceed to lower percentages than individual components at the same conditions. During the multicomponent ozonation of the endocrine disruptors, it was found that 17β-estradiol (E2) converted to estrone (E1) at the beginning of the reaction.
shada Abdelati Elalem(9-2020)
publisher's website

rd International Conference On Innovation and Engineering Management

Abstract—The construction industry is one of the main sectors of the Libyan economy, and it is an important industrial sector in terms of economic and social impact and also employment facilities. Currently, the Construction Industry (CI) in Libya contributes 5.2 per cent of the Libyan Gross Domestic Product (GDP), and it employs around 3.2 per cent of the total manpower[2]. This paper will be presented how to use lean six sigma "Define, Measure, Analysis, Improve, and Control (DMAIC)" Methodology to determine and evaluate the most important and frequent factors causing delay in construction projects in the electricity sector (GECOL). Through literature review, a comprehensive list of causing factors delay was determined, such as: slow Decision Making, Lack of experience in construction, improper project feasibility research, Inadequate contractor experience, Inappropriate construction methods, Inaccurate cost estimating, and inadequate fund allocation. A survey based on a questionnaire carried out among randomly selected personal such as project managers, project engineers and top managers in the General department of Projects in the Company, also the main contractors and consultants are involved in this survey, to get their perception as to the significance of these factors in delay of Electricity projects. The data gathered was analyzed using Lean six sigma DMAIC methodology to identify and rank the significantfactors causing delay in Construction Projects in the Electricity sector –Libya. Keywords: Lean Six Sigma, DMAIC, Construction Project, Significant Factors, GECOL.
Zedan Hatush(1-2015)
publisher's website

Overcoming the Barriers to Implement Passive Climatic Design in the Libyan Built Environment

Climate change is one of the most difficult problems facing the world today, accordingly, passive climatic design has been considered as an essential approach to a sustainable built environment. It is design that does not require mechanical heating or cooling were buildings are passively designed to take advantage of natural energy flows to sustain thermal comfort and create a good stable indoor climate. Issues related to climate have been explored by a number of researchers in Libya, however, the application of passive climatic design in the contemporary Libyan architecture is very rare. Within this background, this research is conducted based on qualitative approach by utilised interview for data collection, were members from different professional groups who dealt with passive design were interviewed in order to establish factors influencing the implementation of passive climatic design in the Libyan built environment. The findings show that there are four main factors related to Architectural and planning design, End users, Marketing and Government. The paper identifies the principles of passive climatic design in hot regions and provides suggestions to implement these principles in Libyan future architecture.
Aisha Ammar Almansuri(3-2020)
publisher's website

EXPLORING MOVEMENT BEHAVIOUR IN THE CENTRAL GARDEN OF ZUWARA CITY– LIBYA

Urban spaces provide a suitable place to social communicate, as these urban spaces provide a variety of physical and social benefits. Human behaviour is the sum of the psychological, physical, motor, physiological and verbal activity of a person who deals with and interacts with his environment. It represents all kinds of activities that a person undertakes while dealing with and adapting to the environment and includes several aspects: cognitive, movement and emotional. The paper aims to determine the effect of human movement behaviour in the central garden of Zuwara. the methodology used is qualitative research, through personal observation of the behaviour of the visitors, monitoring them using a video camera, recording comments and signing them on the tracking maps. and the interviews were used to gather opinions of the users about the reasons for the behaviours used within the garden, and explore the users' satisfaction with the garden's components, services and the ease of movement within it. The results showed some unplanned movement behaviours in the garden, such as walking on the grass instead of walking in the paths designated for that. The study presented a set of recommendations for the study area, along with a proposal that includes the visitors' requirements and some services that contribute to increasing the efficiency of the garden.
Aisha Ammar Almansuri, Latifa M. Wafa, Majduilin adel Elmansuri(12-2021)
publisher's website

Advanced Exergoeconomic and Exergy Cost Sensitivity Analyses of Steam Power Plants

In this study, the exergy and exergoeconomic analyses of simple typical thermal power plants are carried out. The general methodology for defining and calculating exergetic efficiencies, exergy destruction, exergoeconomic factors, total cost, improvement potential and exergy related costs in thermal systems are presented. The procedure is based on the Specific Exergy Costing approach and sensitivity cost analysis. Thermodynamic working fluid properties are obtained by employing both THERMAX and MATLAB software packages. For the considered normal operating and economic conditions; the percentage ratio of the exergy destruction to the total exergy destruction and Potential Improvement was found to be maximum in the boiler, with 88.4% and 92.8%, respectively. The exergoeconomic factor is calculated for the boiler, turbine, condenser and pump, with values of 0.23, 0.35, 0.42, and 0.39, respectively. The total costs of exergy loss are 5153, 1737, 619, and 43 $/hr, for the boiler, turbine, condenser, and pump, respectively. Sensitivity and parametric analyses confirm that the exergoeconomic factor, total annual plant cost, and unit cost of the work and steam, increase with the rise in the interest rate, while they decrease with increasing the annual number of working hours. With the increase of the working boiler temperature, the unit cost of work and steam drop, while the exergoeconomic factor and the total cost rise. The total cost, unit cost of work and steam, increase with the increase in the reference environmental temperature, however, the exergoeconomic factor decreases. For the proposed conditions, the total cost of the plant is 14,000 $/hr for a considered fuel cost of 0.0255 $/kWh, including 10,000 $/hr for the cost of the steam production at 650°C with a unit steam cost of 0.029 $/kWh. It’s a valuable achievement to have determined values and clear parametric influences that could be of great assistance to the site engineers and operators to effectively establish their unique jobs, while playing with the conflicts of the use of energy, exergy, and cost.
Malik Farag Elmzughi(8-2020)
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DEGRADATION OF ENDOCRINE DISRUPTING COMPOUNDS BY OZONEIN SYNTHETIC WATER

In this research paper, ozone technology is used to eliminate pollutants in water and in wastewater treatment processes. The ozone reactions with the endocrine disrupters were studied at different gas flow rates, initial concentrations of endocrine disrupters, ozone concentrations and pH. The degradation of 17β-estradiol (E2) as single compound was the fastest reaching about 90% removal in almost 5 minutes. However, estrone (E1) degradation was the lowest reaching about 70% removal at the same time. The degradation of mixtures of the endocrine disruptors was found to proceed to lower percentages than individual components at the same conditions. During the multicomponent ozonation of the endocrine disruptors, it was found that 17β-estradiol (E2) converted to estrone (E1) at the beginning of the reaction.
Asia Ali M.Meshrghi, Mawaheb M. Zarok Derdar, Shada A. Elalem, Khaled M. Mezughi (9-2020)