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Blue Nile State, Sudan

Blue Nile University is a public university located in Damazeen, Sudan.It was established in 1995.It is a member of the Federation of the Universities of the Islamic World. Wikipedia.

Hassan M.A.,Blue Nile University
Proceedings - 2015 International Conference on Computing, Control, Networking, Electronics and Embedded Systems Engineering, ICCNEEE 2015 | Year: 2015

This paper aims to observe the dynamic behavior of synchronous generators during symmetrical faults and load rejection occurrence. So, a new proposed simulation technique was developed to simulate the synchronous generator characteristics in one simulation block using MATLAB SIMULINK Program. This block is simple, easy to use and it completely describes the electrical characteristics of synchronous generator. As a results, it was found that, the three-phase short circuit current waveforms consist of; fundamental frequency component which decays during subtransient, transient, and steady-state period, and a unidirectional component which decays exponentially in several cycles. Furthermore, it was found that at the load rejection occurrence the electrical torque and currents immediately go to zero. Accordingly it was observed that the frequency and voltage were increased to a high value which reaches more than 80 Hertz for frequency and 2.0 per unit for voltage respectively. © 2015 IEEE. Source

Edreis E.M.A.,Huazhong University of Science and Technology | Edreis E.M.A.,Blue Nile University | Luo G.,Huazhong University of Science and Technology | Yao H.,Huazhong University of Science and Technology
Journal of Analytical and Applied Pyrolysis | Year: 2014

The CO2 gasification reactivity, thermal behaviour and activation energies of sugar cane bagasse (SCB) chars prepared at 500, 800 and 900 °C were investigated by using thermogravimetric analysis (TGA) under non isothermal conditions at different heating rates of 20, 30 and 40 °C min-1. The characteristics (physical and chemical structures) of the sugar cane chars as a function of pyrolysis temperature have been studied by applying Brunauer-Emmett-Teller (BET) surface area and Fourier transform infrared spectroscopy (FTIR) techniques. The results have demonstrated that the gasification of SCB chars took place almost completely in one-stage process as it has been shown by the presence of only one peak in DTG curve. The char reactivity is an inversely proportional to the pyrolysis temperature and directly to a gasification heating rate. As pyrolysis temperature increases, the char physical structures (BET surface area, pores characteristics) are directly proportional to the pyrolysis temperature. The hydroxyl, aliphatic C-H, carbonyl and olefinic C=C groups were lost at high pyrolysis temperatures (800 and 900 °C). The activation energies were estimated by using Vyazovkin and Ozawa-Flynn-Wall methods, which have resulted in the mean of activation energy values of 70.44-88.37, 89.16-101.55 and 107.20-115.29 kJ mol-1, respectively for char prepared at 500, 800 and 900 °C. Finally, Vyazovkin and Ozawa-Flynn-Wall methods were effectively applied to predict the reaction mechanism of thermal gasification. © 2014 Elsevier B.V. Source

Eltahir M.A.,Blue Nile University | Dafa-Alla A.F.A.,Garden City College
Proceedings - 2013 International Conference on Computer, Electrical and Electronics Engineering: 'Research Makes a Difference', ICCEEE 2013 | Year: 2013

The growth of the Internet is increasing rapidly and the use of websites and web-based systems has become very common. The main problem that faces any website admin or any web application system is data increase per-second, which is stored in different types and formats in server log files about users, their future needs and maintains the structure and content of website or web services according to their previous data. Web usage mining aims at discovering useful information or knowledge from usage data registered in log files, based on primary kinds of data used in the mining process. By using one of the web mining techniques, this paper uses a web usage mining technique to procure knowledge from web server log files where all user navigation history is registered. © 2013 IEEE. Source

Edreis E.M.A.,Huazhong University of Science and Technology | Edreis E.M.A.,Blue Nile University | Luo G.,Huazhong University of Science and Technology | Li A.,Huazhong University of Science and Technology | And 2 more authors.
Energy Conversion and Management | Year: 2014

This study investigates the possible synergistic interactions between the Sudanese lower sulphur petroleum coke (PC) and sugar cane bagasse (SCB) during H2O co-gasification with three concentration values (25%, 50% and 75% v/v) using a thermogravimetric analyser (TGA) at 20 C/min. The kinetic thermal behaviour, and effects of both H2O concentration and fuel blending ratio were investigated. The results show that, significant interactions existed in both reaction stages of samples, and become less when PC content and H 2O concentration are 50%. Petroleum coke showed only one char gasification stage at (>700 C) at 75% H2O. Some kinetics models like homogeneous and shrinking core models were studied by the Coats-Redfern method in order to observe the optimum reaction mechanism for the H2O gasification of samples, describe the best reactive behaviour and determine the kinetic parameters. The results showed that, the co-gasification behaviour and kinetic parameters have a significantly influenced by increasing both H 2O concentration and PC content. The boundary controlled reaction model (R2) shows the lowest values of activation energy (E) for all samples and H2O concentrations. Finally, all the models are successfully utilized to predict the experimental data under all H2O concentration values. © 2013 Elsevier Ltd. All rights reserved. Source

Yang J.,South China University of Technology | Wang Y.,South China University of Technology | Abdelgadir A.A.,South China University of Technology | Abdelgadir A.A.,Blue Nile University
Journal of Mathematical Physics | Year: 2013

It is established the existence of nontrivial solutions for quasilinear Schrödinger equations with subcritical or critical exponents, which appear from plasma physics as well as high-power ultrashort laser in matter. © 2013 AIP Publishing LLC. Source

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