Libya Journal of Applied Sciences and Technology

Original Articles

• The Role of Multinational Corporations Leadership Styles in Shaping Libya's Economy

  📄 Original Article

  Abdalla Mohamed Ghlaiow, Mustafa kozan oğlu (Author)

  1-10

  This qualitative exploratory single-case study examines how executives from multinational corporations (MNCs) adapt their leadership styles to manage cross-cultural challenges while operating in Libya’s emerging, post-conflict economy. Libya’s critical need for infrastructure investment has attracted multinational actors, yet cultural distance, institutional fragility, and security constraints complicate knowledge transfer, stakeholder engagement, and project implementation. Semi-structured...

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• Geochemical Investigation of Quaternary Sabkha Sediments in the Sirte Basin, North Central Libya

  📄 Original Article

  Osama Rahil Shaltami, Hamza Al Matoni, Ramzi Salem, Mustafa A. Ben Hkoma, Aisha Alshabani (Author)

  11-22

  In this study, the depositional environment, paleoweathering, paleoclimate, maturity, and paleoproductivity of the sediments of Sabkhat Wadi Matratin, As Sabkha Al Kabirah, Sabkhat Al Uwayjah, Sabkhat Ghuzayil, Sabkhat Zaqqut, Hatiyat Al Muhayriqah, Hatiyat Muraq, Hatiyat Jabbanah, and Qarat Suhub were appraised based on the major oxide concentrations. The results showed that the studied sediments were deposited in a suboxidized marine environment with noteworthy terrestrial input. The arid...

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• Improvement of Surface Quality by Reducing the Part's Surface Roughness Texture

  📄 Original Article

  Mohamed. M. Salem (Author)

  23-31

  Polyamide (PA) materials are extensively used in Selective Laser Sintering (SLS) for producing functional components. Among them, DuraForm PA and DuraForm GF from 3D Systems, along with PA 2200 and PA 3200 GF from EOS, are widely adopted for their favourable mechanical and thermal properties. Glass-filled (GF) composites, composed of a polymer matrix reinforced with glass particles, provide enhanced stiffness and dimensional stability compared to unfilled PA materials. This study focuses on...

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• Evaluation of Effect Heat Treatment on Mechanical Properties of Low Carbon Steel with Different Cooling

  📄 Original Article

  Khaled Saleh Mohammed Alwaer, Ebraheem Ahmed Altome, Omer Kalaf (Author)

  32-39

  In this study, Low carbon steel C 17 were selected to investigate the effect of different cooling during the heat treatment on mechanical properties. The samples were heated in a heat treatment furnace at approximately 980°C for almost 1 hour and then cooled by different quenching media (water, air, oil). The results show that Oil quenching also had a slight effect on the metal tensile strength and hardness. The change in the ultimate stress was observed. Upon water quenching, the result was...

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• Mechanical Vibration Analysis of Ship Hulls Using Numerical Simulation

  📄 Original Article

  Ahmed Amear Gaddour, Nabil Ali Alftouri (Author)

  40-49

  This study investigates mechanical vibrations in ship structures using advanced numerical simulation techniques. A three-dimensional model of a tugboat hull was developed using CAD software, followed by finite element analysis (FEA) in Abaqus to evaluate stress distribution and dynamic response. Computational fluid dynamics (CFD) was integrated to simulate water flow around the hull and quantify the resulting hydrodynamic forces. The numerical model was validated through comparison with...

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• Using Bernoulli's Differential Equation To Solve Thermodynamic And Aerodynamic Problems Describing Changes In Velocity Or Pressure

  📄 Original Article

  Ahmed .M. Elmishri, Mohamed M. Al fetori, Khalid M. Omran, Adel .E. El-allam (Author)

  50-59

  Bernoulli's equation represents a cornerstone in fluid dynamics, describing the interdependence of pressure, velocity, and elevation along a streamline. Rooted in the principle of energy conservation, it offers essential insights into the behavior of thermodynamic and aerodynamic systems. This study investigates the application of Bernoulli's differential form to analyze variations in velocity and pressure within fluid flows. The derivation, underlying assumptions, and practical implications...

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• Residue Upgrading Options for Maximum Gasoline Production From Libyan Crude Oil

  📄 Original Article

  Saod M. Saleem, Abdalbaset M. Algish, Adel Eltaher El-allam (Author)

  60-68

  Different refinery configurations are investigated for upgrading projects to increase gasoline production for local market demand. Libya is an important contributor to the global supply of light and sweet crude. It has five domestic refineries, all of which are simple hydro-skimming units. This work presents a theoretical approach for upgrading of atmospheric and vacuum residue derived from the heaviest Libyan crude oil. Obtained results show that option 3, which included delayed coking, has...

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• Thermal Performance Assessment of Heat Exchangers In An Industrial Ethylene Production Facility

  📄 Original Article

  Fathi Ashor, Abdalbaset M. Algish, Abdelkader Salem, Khalid M. Omran (Author)

  69-76

  This study provides a comprehensive performance assessment of three critical heat exchanger units (2-H-301, 3-H-601, and 3-H-501) within an industrial Ethylene production facility in Ras Lanuf plant. Steady-state monitoring and direct data acquisition from operational equipment were conducted with subsequent data analysis performed using energy balance equations to quantify key thermal performance parameters. These parameters included overall heat transfer coefficients, heat duties, hot and...

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• Micro T- mixer: The effect of scaling factor and mixing angel

  📄 Original Article

  Elmabruk H. Ali, Elmabruk H. Ali, Basma Mahmud Tunsi, Ali Ayad Ejbali (Author)

  77-90

  Different phenomena observed in various experiments indicate that the flowing mechanisms of liquids in microchannels are still not understood clearly. Computational fluid dynamics (CFD) simulation was used to simulate liquid flow in a T-shaped micromixer whose structural dimensions and operating conditions were varying. The results show that, the formation of vortices in the mixing zone arises through the influence of a T-junction (changes flow direction and gives rise to a secondary flow)....

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• Potential Opportunities for Libya's Construction Industry After Political and Economic Instability: A Comparative Analysis

  📄 Original Article

  Mohamed Masaud Mohamed Dwa (Author)

  91-102

  This study examines the challenges and opportunities for Libya's construction industry following years of political and economic instability. Through a mixed-methods approach combining statistical analysis of survey data (n = 150 professionals), comparative case studies (Iraq, Rwanda), and literature review, the research identifies political instability as the most significant barrier (β = 0.42, p < 0.001), correlating strongly with project delays (r = 0.82) and cost overruns (r = 0.84)....

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• Comparison of Petroleum Hydrocarbon Levels in Western Libyan Beach by Gravimetric and Spectroscopy Analysis

  📄 Original Article

  Ali. A. Ejbali, Elmabruk H. Ali, Muhsen J. Ghurbaj, Najwa A. Shames (Author)

  103-115

  Fourteen shore water samples (denoted as w) from west of Tripoli shoreline, were examined for their petroleum hydrocarbon contents by gravimetric and spectroscopy analysis. Known amounts of beach water (w) were extracted with a suitable volume of chloroform (CHCl₃). The extracts were measured spectrophotometrically through calibration curves of absorptions at 410nm and 260nm to determine the concentration of petroleum hydrocarbons. Infrared analysis was also conducted on hydrocarbons...

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• The Impact of Internal Marketing Dimensions on the Teaching and Research Performance of Faculty Members in Technical Colleges in Tripoli A field study from the point of view of faculty members

  📄 Original Article

  Sami Mohammed maayuf, Hussein Abulqasim Al-Tuweel, Najmuddin Al-Fahim Saqr (Author)

  1-16

  Based on these results, the study recommended adopting a comprehensive internal marketing strategy to address existing weaknesses and enhance integration among its dimensions. Furthermore, it emphasized the importance of improving the overall performance of faculty members by achieving a more balanced approach between teaching responsibilities and scientific research activities. From a theoretical perspective, these findings reinforce the principles of internal marketing theory, which posits...

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• Evaluating the Performance of Commercial Banks Using the CAMELS Model – An Applied Study on Bahraini Banks

  📄 Original Article

  Tariq Ramadan Khalifa Abukhris (Author)

  17-41

  This study aims to identify the "CAMELS" model as an effective and accurate tool to be used as a performance evaluator in banking industries and to anticipate future and relative risks. Banks being exposed to financial faltering is considered one of the important events that draws attention and calls for study, due to its extremely dangerous effects. CAMELS ratios are calculated in order to focus on financial performance, which stands for Capital adequacy, Asset quality, Management, Earning,...

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• Simulation and Performance Analysis of Photovoltaic Units under the Influence of Environmental Variables using MATLAB/Simulink

  📄 Original Article

  Abdalbaset Noureddin, Salem Faraj Alarabi, Nouri Al-Megrahi (Author)

  42-60

  Solar energy is one of the most important renewable energy sources, effectively contributing to meeting the growing global demand for electricity while reducing carbon emissions. Despite the high performance of these units, a precise quantitative analysis of the impact of varying environmental factors on them using dynamic modeling remains essential to improve their performance in field conditions, particularly solar irradiance intensity and temperature, which directly affect the electrical...

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• Calculation of the Concentration Ratio and Solar Flux Distribution of the Truncated Pyramid Solar Concentrator Using Three-Dimensional Ray Tracing Simulation

  📄 Original Article

  Hana Juma bin Halim, Badr Aldeen Juma Saad, Mohamed Abdulaziz Mansour (Author)

  61-76

  The Truncated Pyramidal Solar Concentrator (TPSC) is a four-mirror device configured as a square frustum, utilized in solar oven technology for medium-temperature applications. This study aims to calculate the concentration ratio and solar flux distribution on the receiver by ray-tracing incident solar radiation from the aperture until it strikes the receiver or escapes. Assumptions include solar rays as equal, symmetric straight lines tilted by the altitude angle and the solar azimuth...

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