Omdurman, Sudan

Omdurman Ahlia University
Omdurman, Sudan

Omdurman Ahlia University is a community non-profit university in Omdurman, Sudan. It was opened on 1 November 1986 as Omdurman Ahlia College, and was upgraded to University status on 7 May 1995.As of September 2011, the university was a member in good standing of the Association of African Universities. Wikipedia.

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Omer B.M.,Taif University | Omer B.M.,Omdurman Ahlia University
Chinese Physics Letters | Year: 2015

The effect of the valence band tail width on the open circuit voltage of P3HT:PCBM bulk heterojunction solar cell is investigated by using the AMPS-1D computer program. An effective medium model with exponential valence and conduction band tail states is used to simulate the photovoltaic cell. The simulation result shows that the open circuit voltage depends linearly on the logarithm of the generation rate and the slope depends on the width of the valence band tail. The open circuit voltage decreases with the increasing width of the band tail. The dark and light ideality factors increase with the width of the valence band tail. ©2015 Chinese Physical Society and IOP Publishing Ltd.

Abdelsalam Dr. K.E.A.,Omdurman Ahlia University | Hassan I.K.,Omdurman Islamic University | Sadig I.A.,Islamic University
Journal of Research in Medical Sciences | Year: 2012

Aims: The major aim of this study is to examine the role of alterations in lipid profile in women developing breast cancer. This study was carried out between May 2009 and December 2010. Background: The relationship between lipids and breast cancer is undistinguished. Until now, conflicting results have been reported on the association between lipids and risk of breast cancer development in women. Materials and Methods: Plasma lipids (i.e., total cholesterol [TC], high-density lipoprotein [HDL], low-density lipoprotein [LDL], and triglycerides [TG] were analyzed from 60 controls and 120 untreated breast cancer patients with clinical and histopathological evidence, under aseptic conditions. Venous blood was drawn from the cases and controls and estimations of lipid profile were done utilizing the standard procedures. Statistical Analysis Used: Independent sample t-test to compare the mean serum levels of lipid profile and TC/HDL ratio between patients and controls. Results: A significant rise in serum total cholesterol, low-density lipoprotein cholesterol, and ratio of total cholesterol: high density lipoprotein cholesterol values, whereas high density lipoprotein cholesterol and very low density lipoprotein cholesterol were not affected significantly by the breast cancer. Conclusions: The developing breast cancer might be considered as one of the factors in alterations in lipid profile levels.

Omer B.M.,Omdurman Ahlia University | Khogali A.,Omdurman Ahlia University
Research Journal of Applied Sciences, Engineering and Technology | Year: 2012

For the optimum design of the donor and acceptor materials in polymer solar cells, it is very important to do a theoretical calculation for the energy levels and energy gaps. In this work we used the semi-empirical method Austin Model1 (AM1) to investigate the Higher Occupied Molecular Orbital (HOMO) and Lower Unoccupied Molecular Orbital (LUMO) of polythiophenes derivatives/fullerenes combination (bulk heterojunction polymer solar cells). The overestimation on the HOMO and LUMO values was corrected by using experimental data from literature as criteria of correctness. Using our correction method, a reasonable linear relationship between the computed energy band gaps of polythiophenes derivatives and the experimental band gaps were found. The corrected HOMO and LUMO energies of polythiophenes derivatives match well with the experimental one. This method can serve as a road map inorder to design and synthesis appropriate combination of polythiophenes derivatives/fullerenes for bulk heterojunction solar cells. © Maxwell Scientific Organization, 2012.

Mohamed R.E.,Omdurman Ahlia University | Gadour M.O.,Omdurman Ahlia University | Adam I.,Omdurman Ahlia University | Adam I.,University of Khartoum
Frontiers in Physiology | Year: 2015

Hyperlipidemia especially low density lipoprotein cholesterol (LDL-C) is a major risk factor for developing ischemic heart disease. Soluble dietary fiber has lipid lowering characteristics. Gum Arabic (GA) is 95% soluble fiber calculated on dry bases. The beneficial effect of GA on lipid profile needs further verification. A case-control study was conducted at Omdurman Hospital, Sudan to assess the effect of G A on serum lipids in patients with hyperlipidemia. Cases received a 20 mg tablet of atorvastatin/day plus 30 mg of GA for 4 weeks while the controls received atorvastatin only. Levels of lipids in serum were assessed according to conventional methods before and 1 month after the trial. There is no significant difference in the basic characteristics between the study and the control groups (55 patients in each arm of the study). While there was no significant difference in the levels of HDL, there was a significant reduction of the total cholesterol (25.9 vs. 7.8%, P < 0.001), triglyceride (38.2 vs. 2.9%, P < 0.001), and LDL (30.8 vs. 8.1%, P < 0.001) before and after the intervention in the study compared to the controls groups. © 2015 Mohamed, Gadour and Adam.

Thin films of Poly(3-hexylthiophene-2,5-diyl) (P3HT) were prepared from chloroform, 1,2 dichlorobenzene and toluene solutions by spin coating technique on quartz substrates. The absorption and photoluminescence (PL) measurements were performed on the P3HT films to investigate the influence of solvent on the optical properties of the films. The results shows that the UV-vis absorption of P3HT film spin-coated from toluene is red shifted compared to the spectra of the films spin-coated from either chloroform or 1,2 dichlorobenzene. The surface morphology of P3HT: [6, 6]-Phenyl C61-butyric Acid 3- ethylthiophene Ester (Modified Fullerene) thin films spin-coated from different solvents were studied using Atomic Force Microscope (AFM), the thin film spin-coated from 1,2 dichlorobenzene show the smoother surface. © 2013 Sumy State University.

El Sanousi G.T.A.,Omdurman Ahlia University
2010 7th International Conference on Wireless and Optical Communications Networks, WOCN2010 | Year: 2010

This paper presents a novel technique to enhance the link performance in satellite network. The technique exploits the location diversity of terminals in the ground segment (stations) and the Multiple Input Multiple Output (MIMO) mathematical frames (also known as 'Network MIMO'). In this technique these diverse terminals are linked to a control unit (e.g. the hub) to coordinate the joint transmission\ detection in the up and down links respectively. The other pillar to this technique is the use of special antenna-site-distribution structures (in the form of Uniform Linear Arrays- ULA) to provide the Uncorrelated High Rank (UHR) channel in the presence of the strong Line Of Sight (LOS) as is usual in satellite links. The relation between the range, wavelength and the antenna separation products are examined for different ranges corresponding to different orbits from Low Earth Orbit (LEO) to Geostationary Earth Orbit (GEO)- this with respect to the proposed technique. The presented results are analysed. An outline of the applications of the technique and its merits is concluded with. ©2010 IEEE.

Omer B.M.,University of South Africa | Omer B.M.,Omdurman Ahlia University
2014 IEEE 40th Photovoltaic Specialist Conference, PVSC 2014 | Year: 2014

AMPS-1D was used to simulate the dark and light current density-voltage characteristics of P3HT:PCBM bulk-heterojunction solar cell. An effective medium model with exponential valence and conduction band tail states was used to study the influence of characteristic energy of the valence band tail (ED) on the performance of the device. The simulation result shows that the open-circuit voltage depends linearly on the logarithm of the generation rate and the slope depends on the characteristic energy of the valence band tail. The simulation results shows that the photovoltaic properties of P3HT:PCBM bulk-heterojunction solar cells are limited by the carrier recombination at the band tail states. © 2014 IEEE.

Omer B.M.,Taif University | Omer B.M.,Omdurman Ahlia University
Journal of Nano- and Electronic Physics | Year: 2013

We fabricated and studied the electrical and photovoltaic properties of organic solar cell based on poly (3- hexylthiophene) (P3HT) as an electron donor blended with the acceptor [6, 6]-Phenyl C61-Butyric Acid 3- Ethylthiophene Ester (modified fullerene). The active layer composed of (3:1, w/w) mixture of P3HT and the modified fullerene was sandwiched between indium tin oxide (ITO) and aluminum (Al). The ideality factor n and barrier hight b values were determined from the dark current density-voltage characteristics and found as 2.45 and 0.78 eV, respectively. The device shows photovoltaic behavior with an open circuit voltage of 400 mV, short circuit current of 22.9 A/cm2 and fill factor 0.32 under 2.8 mW/cm2 light intensity. © 2013 Sumy State University.

Omer B.M.,Omdurman Ahlia University
Journal of Nano- and Electronic Physics | Year: 2012

Thin films of Poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) were prepared from chloroform, 1,2-dichlorobenzene and toluene solutions by spin coating technique on quartz substrates. Absorption and photoluminescence (PL) spectra of the polymer thin films prepared from different solvents were measured. It was concluded from the UV-Vis absorption and PL spectra that the optical properties of MEH-PPV films strongly affected by solvents used for spin coating. A strong photoluminescence quenching was observed in (1:4) MEH-PPV: [6,6]-Phenyl C61-butyric Acid 3-ethylthiophene Ester (Modified Fullerene) composite which provides evidence of photoinduced charge transfer. Further, with Atomic Force Microscope (AFM) it has been demonstrated that the surface morphology of the MEH-PPV: Modified fullerene thin films are strongly dependent on the preparation condition (solvents). © 2012 Sumy State University.

PubMed | University of Khartoum, Omdurman Ahlia University and El Imam El Mahdi University
Type: Journal Article | Journal: PloS one | Year: 2016

Although the exact pathophysiology of preeclampsia is not fully understood, several elemental micronutrient abnormalities have been suggested to play a contributory role in preeclampsia.To investigate the levels of calcium, magnesium, zinc and copper in women with preeclampsia.A case-control study was conducted in Omdurman Maternity Hospital, Sudan, during the period of September through December 2014. The cases were women with preeclampsia while healthy pregnant women were the controls. The medical and obstetrics history was gathered using questionnaires. The serum levels of calcium, magnesium, zinc and copper were measured using atomic absorption spectrophotometer.There was no significant difference between the two groups in their age, gestational age, parity and body mass index. Zinc and copper levels were not significantly different between the two groups. In comparison with the controls, women with preeclampsia had a significantly lower median (inter-quartile) serum calcium [7.6 (4.09.6) vs. 8.1 (10.614.2), mg/dl, P = 0.032] and higher levels of magnesium [1.9 (1.42.5) vs. 1.4 (1.01.9) mg/dl; P = 0.003]. In binary logistic regression, lower calcium (OR = 0.73, 95% CI = 0.56 0.95, P = 0.021) and higher magnesium (OR = 5.724, 95% CI = 1.23 26.50, P = 0.026) levels were associated with preeclampsia. There were no significant correlations between levels of hemoglobin and these trace elements.The current study showed significant associations between preeclampsia and serum levels of calcium and magnesium.

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