http://dspace-su.server.ly:8080/xmlui/handle/123456789/2115 Sun, 03 May 2026 12:58:24 GMT 2026-05-03T12:58:24Z http://dspace.lslab.ly:80/bitstream/id/a2a642f4-1c13-46f4-a739-a6069f6a766d/ http://dspace-su.server.ly:8080/xmlui/handle/123456789/2115 http://dspace-su.server.ly:8080/xmlui/handle/123456789/2144 Evolution of Grain Size in 34CrNiMo6 Steel as a Function of Thermo-mechanical Process Route Nasar Abddlssalam Ali; Ali k. Diryag; Ali K. M. Al-Zenati; Mahdi Algool The main purpose of the isothermal deformation processes is to quantify the austenite grain size at different deformation conditions and determine the stress strain behaviour of the 34CrNiMo6 low alloy steel. In this study we have simulated the deformation process conditions experienced in the large scale forging of 34CrNiMo6 low alloy steel in order to understand and optimize the thermo-mechanical process parameters that determine microstructure and thus the final mechanical properties. Isothermal hot working tests over the temperature range of 900°C - 1260°C, strain rates of 0.1, 0.5 and 1s¯¹, and strains of 0.4, 0.6 and 0.8, while a range of microscopy methods will be used for microstructure analysis. The peak stress and peak strain for initiation of dynamic recovery (DRV) and recrystallization (DRX) at different temperatures and strain rates were calculated. The relation between grain size diameter and both of Zener-Hollomon parameter and deformation temperatures with changing of strain rate at both austenitising temperatures of 1100°C and 1260°C were determine. All these data are going to be used through the general constitutive equations to determine the hot working constants Tue, 01 Dec 2020 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/2144 2020-12-01T00:00:00Z http://dspace-su.server.ly:8080/xmlui/handle/123456789/2139 The Most Important Causes of Delays in Highway Construction Projects: Libyan Investigation Based Hamza Ali Abdel Salam; Farag Hussan Gaith The study is laying its foundation on quantities’ statistical data collected from current and former consultants who have had the opportunity to investigate the delaying of the construction such as projects, identifying the system bottle-necking and accelerate the system performance by overcome any delaying obstacles. The purpose of this study is to investigate the most important causes of delays in Libyan highway construction projects. The participants, who were a representative segment of Libyan people all commented on 35 possible reasons for delay and their views were evaluated using data analysis techniques (Relative importance index (RII) by the SPSS program and average index calculation) to report on the data collected. Within the limits of the data analysis the results revealed that; the effective delays are caused by mainly six reasons which including the following; obstacles from government, poor contract management by consultant, delays in payment by clients to implementing companies, ineffective planning by contractor and inaccurate scheduling, poor site management, and sluggishness in the decision-issuing process from clients. Tue, 01 Dec 2020 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/2139 2020-12-01T00:00:00Z http://dspace-su.server.ly:8080/xmlui/handle/123456789/2137 An Application of Multidimensional Scaling in Fault Detection of Smart Grids Khaled Abdusamad; Tariq Aboalhol Monitoring smart grids and detecting faults in such huge networks has recently become an active area of research. The huge amount of data transferred from the measurement units to the control center makes it difficult to detect faults in a reasonable amount of time. Some existing methods have been investigated and tested on many IEEE models such as wavelet transform, principal component analysis (PCA) to extract the abnormal behavior of signals under monitoring [1]. However, such techniques pose difficulties in detecting different faults properly. In this paper, the multidimensional scaling (MDS) is investigated as an alternative technique for reducing the dimensionality of the data to lower dimensions, while maintaining the necessary information needed for fault detection. MDS is then used to investigate the behavior of some IEEE models under different types of faults in order to detect and locate the faulty bus bars. Tue, 01 Dec 2020 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/2137 2020-12-01T00:00:00Z http://dspace-su.server.ly:8080/xmlui/handle/123456789/2135 The evaluation of Aluminum Alloy Corrosion in Gabraun and Desalination Waters Abdussalam Abdallah Mohammed Gebril The aim of this study was to investigate the effect of Gabraun and Desalination waters on corrosion of aluminum alloy. The corrosion tests were carried out at room temperature. The test solutions (electrolyte) used were Gabraun and Desalination water samples. Weight loss method was used. From the results obtained, it was found that the weights of all the specimens after the tests were decreased. Also it was found that that the average corrosion rate of Aluminum immersed in Gabraun water is little bit greater than the average corrosion rate of Aluminum immersed in Desalination water. The results showed that the color of the specimens surfaces immersed in Gabraun water was changed to white- gray color and the color of the specimens surfaces immersed in Desalination water was change to black-gray color. During the corrosion tests period, the Gabraun and Desalination water in the beakers was decreased about 50mL/week. The presence of some alloying elements like iron (Fe), copper (Cu) and Zinc (Zn) are susceptible to the corrosion processes. The Pourbaix diagrams showed Gabraun water and Desalination water are a corrosive mediums. The Langelier Saturation Index (LSI) showed that the Gabraun and Desalination water samples are not corrosive medium Tue, 01 Dec 2020 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/2135 2020-12-01T00:00:00Z