FES Journal of Engineering Sciences http://journal.oiu.edu.sd/index.php/fjes <p style="text-align: justify;">FES Journal of Engineering Sciences (FJES) is an academic open access peer-reviewed journal published by Faculty of Engineering Sciences (FES) of Omdurman Islamic University (OIU), Sudan. It aims to promote scientific development in all engineering fields. The focus is to publish high quality papers on different topics related to engineering science and technology, Submitted papers will be reviewed by technical committees of the Journal and international experts. The audience includes researchers, managers and operators for engineering fields as well as designers and developers.</p> en-US omer.musa1@oiu.edu.sd (Omer Musa) Sun, 06 Oct 2019 00:00:00 +0100 OJS http://blogs.law.harvard.edu/tech/rss 60 On design of a robust decentralized controller for an interconnected multi-area power system with FACTS devices http://journal.oiu.edu.sd/index.php/fjes/article/view/118 <p>In this article, a robust active disturbance rejection control (ADRC) is proposed for load frequency control (LFC) of an interconnected multi-area power system. Two widely employed test systems, namely, two-areas and four-areas hydro-thermal power utilities are concerned to validate the efficacy of the suggested method. To enhance the performance of the system, series flexible ac transmission system (FACTS) like thyristor controlled series compensator (TCSC) and thyristor controlled phase shifter (TCPS) are considered. The simulation results indicated that the system performance is improved with the inclusion of FACTS devices. The adjustable parameters of the proposed FACTS controllers are optimized using particle swarm optimization (PSO) algorithm employing an Integral of Time multiplied Absolute Error (ITAE) criterion. The investigations showed &nbsp;that the proposed controller provides better dynamic performance than others from the point of view of settling time, peak over/undershoot. Finally, the sensitivity analysis of the system is inspected by varying the system parameters and operating load conditions from their pre-specified values. It is observed that the suggested controller based optimization algorithm is robust and performs satisfactorily with the variations in operating load conditions, system parameters and load patterns. &nbsp;</p> Gomaa Haroun Ali Hamid ##submission.copyrightStatement## http://journal.oiu.edu.sd/index.php/fjes/article/view/118 Sat, 05 Oct 2019 00:00:00 +0100 Numerical study on a new design of solid-fuel ramjet combustor with swirl flow http://journal.oiu.edu.sd/index.php/fjes/article/view/102 <p>A new design of solid-fuel ramjet is proposed and examined numerically in this paper. Multi-physics coupling code is developed using FORTRAN and parallel computing to solve the problems of multi-physics coupling of fluid mechanics, solid pyrolysis, heat transfer, thermodynamics, and chemical kinetics. Simulations are carried out for the proposed design then the results are compared with the classic design of the solid-fuel ramjet. It is found that the proposed design has improved the regression rate significantly; besides, the amount of released solid fuel is increased for the same size. A new flame has been observed inside the combustion chamber of the proposed design then the two flamed were emerged in the afterburning chamber.</p> Omer Musa, Chen Xiong, Guoping Huang ##submission.copyrightStatement## http://journal.oiu.edu.sd/index.php/fjes/article/view/102 Sat, 05 Oct 2019 00:00:00 +0100 تقييم معايير تحكيم مشاريع التخرج لطلبة العمارة، في قسم العمارة جامعة ام درمان الاسلامية- (أ) http://journal.oiu.edu.sd/index.php/fjes/article/view/105 <p><strong>ABSTRACT </strong>The process of evaluation of graduation projects for architecture students is a subject of great importance, because the procedure of assessing the projects has the ability to either build or ruin the future of the students.&nbsp; Therefore, the paper aims to evaluate the assessment criteria for graduation projects for architecture students in the Department of Architecture in Omdurman Islamic University in order to identify the causes and problems that lead to great difference in the degrees of evaluation for the same project among teachers. In order to achieve the objective of the research, a three-stage methodology is required. The first stage is to explore the shortcomings and draw conclusions of the weaknesses by comparing the evaluation criteria for the graduation projects of Architecture students by the members of the Evaluation Committee in the academic medium. The second stage is evaluating the weakness points with the results of the questionnaire in order to identify the problems and weaknesses that lead to the difference. The final stage is to compare the draft of weakness points with the results of the questionnaire. In order to assess the problems and weakness that resulted in the inability of efficiently evaluating graduation projects for students of architecture in a fair procedure due to the lack of sufficient details for each standard, and lack of sufficient flexibility in accurately evaluating graduation projects</p> Ibrahim Siddig Mohamed ##submission.copyrightStatement## http://journal.oiu.edu.sd/index.php/fjes/article/view/105 Sun, 06 Oct 2019 00:00:00 +0100 تقيم الوضع الراهن لجودة مياه مدينة بورتسودان (المصدر خور أربعات) http://journal.oiu.edu.sd/index.php/fjes/article/view/63 <p>Port Sudan is the main port and largest commercial centre of the Sudan located in semi-arid region. Population estimate in 2010 was about 926,000 inhabitants and the water demand estimated was about 120000-150000 m3/day. Water production from Khor Arbaat is 60,000 m3/day in good years; however, it may go down to 30,000 m3/day in bad years. In general, the overall situation of the city is characterized by regular shortages. There are three dams (U/G Dam1, SPC Dam2, FR Dam3) structured on Khor Arbaat for water harvesting (2005,2000,1992), siltation represents the greatest problem to these Dams, accordingly their capacities storage is decreases. Their storage capacities are 16*106, 5*106, and 6*106 m3 respectively, therefore the small capacities of these dams lead to inflation silt in a limited period of time. In the same way the Sea Port Corporation (Dam 2) in the year 2012 was removed by the armed forces of the corps as a result of inflation silting and thickness of silting to 6 meters. Water from Khor Arbaat gets into the transfer system without any treatment. The study is carried out to assess and evaluate the quality of surface and ground water resources in the Khor Arbaat zone. Field works included three visits to the study area, on January 2018, February 2018, and on March 2018. Sixteen typical water samples collected from different locations within Khor Arbaat and the city network were analyzed for physical and chemical water quality parameters. GIS Arc. Map and Kriging method are used to study the characteristics of water depend on coordinates and samples results.</p> Mustafa SirElkhatim Mustafa ##submission.copyrightStatement## http://journal.oiu.edu.sd/index.php/fjes/article/view/63 Sat, 18 Apr 2020 09:07:49 +0100 Three Different Features Based Metric To Assess Image Quality Blindly http://journal.oiu.edu.sd/index.php/fjes/article/view/121 <p>Abstract When creating image quality assessment metric (IQA) no confirmation all distortion types are available. Non-specific distortion blind/no-reference (NR) IQA algorithms mostly need prior knowledge about anticipated distortions. This paper introduce a generic and distortion unaware (DU) approach for IQA with No Reference (NR). The approach uses three different measuring features which are initiated from the gist of natural scenes (NS) using Log-derivatives of the parameters; a general Gaussian distribution model, two sharpness functions, and Weibull distribution. All features were analyzed and co mpared together to examine their performance. When calibrating the proposed features performance on LIVE database, experiments show they have good contribution to the state of the art IQA and they outperform the popular full-reference peak signal-to-noise ratio (PSNR) and structural similarity (SSIM) methods. Also they show sharpness features are the best when assess both prediction monotonicity and predict accuracy evaluation among the three features categories. Besides they show asymmetric generalized Gaussian distribution (AGGD) based features have the best correlation with differential mean opinion score.</p> Saifeldeen Abdalmajeed Mahmood ##submission.copyrightStatement## http://journal.oiu.edu.sd/index.php/fjes/article/view/121 Sat, 23 May 2020 00:00:00 +0100