http://dr.limu.edu.ly/handle/123456789/43 Sat, 04 Apr 2026 09:38:34 GMT 2026-04-04T09:38:34Z http://dr.limu.edu.ly/handle/123456789/4933 Fuzzy Logic Technique and Response Surface Methodology to Predict the Material removal rate of Abrasive Water Jet Process (AWJM) Parameters on Inconel – 188 Omar, Al Denali; Abdelaziz, Badi; Fathi, Alfazani Abrasive waterjet machining (AWJM) is a non-traditional machining process that uses a high-pressure jet of water and abrasive particles to remove material from a workpiece. The AWJM process is complex and highly dynamic, making it difficult to predict and control the machining parameters. In this paper two models have been developed using Fuzzy Logic Technique (FL) and Response Surface Methodology (RSM) in order to predict material removal rate (MRR). The Mean absolute percentage error (MAPE) statistical criteria were 2.8% and 2.40% for the FL and RSM, respectively. As a result, using fuzzy logic to anticipate the MRR of the AWJM process is recommended. Thu, 30 May 2024 00:00:00 GMT http://dr.limu.edu.ly/handle/123456789/4933 2024-05-30T00:00:00Z http://dr.limu.edu.ly/handle/123456789/4932 A Study to Investigate Software Failure Factors in Libyan Organizations Abdelhakim, F. Rashid; Mohamed, A. Hagal; F. M., Naser El-Firjani Software has become very important in everyday life. It is used in almost every field. Even in local society, the dependency level on software has also increased. Whenever there is a software failure, it might have severe consequences on society and individuals alike. Failure does not only affect the client but also the company that is responsible for the development. This study aims to explore the issues that face users and investigate the factors that cause software to fail. A questionnaire was built to derive the issues that users face and distributed using an online Google form across twelve organizations in Benghazi, Libya. In addition, ten interviews were conducted with twenty developers to identify the factors that cause failure. The most common factors among interviewees were identified, including unrealistic schedules and budgets, a lack of user involvement, and incomplete requirements. Finally some recommendations were provided to help engineers and development companies overcome those issues and reduce the failure. Wed, 25 Dec 2024 00:00:00 GMT http://dr.limu.edu.ly/handle/123456789/4932 2024-12-25T00:00:00Z http://dr.limu.edu.ly/handle/123456789/4887 Usability Evaluation of a Locally Developed Software Using Iso Metrics Elmhdwi, Alla; Elfallah, Ehab; Maatuk, Abdelsalam; Benamer, Sami In the information technology era, there is a rapid noticeable increase in software application demand, especially in the last decade. Software development firms are established to meet this demand. Due to the common lack of usability feedback in locally developed systems in Libya, a usability evaluation framework is needed. In this research, a usability evaluation of locally developed software was performed and conducted on Bank Current Accounts Function users (the account handlers within the bank) on Almezan Banking Software System, in Libya. The research aims to measure the usability of Almezan software from the user point of view, using the international tool IsoMetrics (ISO) standard. The study methodology steps included preparing and describing a questionnaire, then defining the type of the sample of the population and the place of distribution of the questionnaire. The results of the data analysis show that the principles of Controllability and Suitability for learning from a user point of view, have received the best-rated feedback of the system. Unlike in Error tolerance and Suitability for individualization, which got lower-rated feedback according to users’ expectations. A comparison has been made between the software under this study’s results and another source of study. The results of the comparison have revealed that the Almezan Software got higher usability of users’ expectations in Suitability for the task, Self-descriptiveness, Controllability, and Conformity with user expectations, while their mean values were significantly different. Furthermore, Error tolerance, Suitability for individualization, and Suitability for learning results were similar, while their mean values showed that they were not particularly different. Mon, 12 Feb 2024 00:00:00 GMT http://dr.limu.edu.ly/handle/123456789/4887 2024-02-12T00:00:00Z http://dr.limu.edu.ly/handle/123456789/4874 Taguchi’s design’s Optimization of Commercial Steel Welding made by Semi-Automated GTAW Saleh, Elfallah Abstract: GTAW is a widely used welding process in industry. It has advantageous mechanical and metallurgical properties over other welding processes such as GMAW. In order to obtain optimal welding conditions, it’s vital to optimize the welding parameters. Commercial steel also referred as mild steel is often used for construction that needs to yield tensile strength. The later was reported to be sensitive to the hardness of welding. The work is to investigate the influence or effect of the transverse tensile strength and hardness of mild steel welding made by semi-controlled GTAW at a variation of groove shape, welding current, and welding speed. The analysis made with Taguchi’s design orthogonal array technique to demonstrate the effect of the welding parameters and optimize these parameters on the tensile strength of the welding. The results showed that higher transverse tensile strength showed higher welding hardness (i.e., 232 MPa and 2555 VHN shown at V-shaped welding). The tensile strength and hardness increased at lower welding current (170 A), V-shaped welding, and higher welding speed (150 mm/min). This combination has shown optimal conditions for stronger and highly effective GTAW welding. The increased internal stresses in welding caused lower transverse tensile strength and hardness of welding. Possibly the lower interpass heat input to increase and thus, lower transverse tensile strength of welding. Sun, 21 May 2023 00:00:00 GMT http://dr.limu.edu.ly/handle/123456789/4874 2023-05-21T00:00:00Z