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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.

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.

Hamdan H.Z.,Neelain University | Kubbara E.,Neelain University | Adam A.M.,Neelain University | Hassan O.S.,University of Khartoum | And 2 more authors.
Annals of Clinical Microbiology and Antimicrobials | Year: 2015

Background: Patients with diabetes mellitus (DM) are more susceptible to urinary tract infection (UTI) than non-diabetics. Due to the emergence of multidrug resistant (MDR) uropathogenic strains, the choice of antimicrobial agent is restricted. This study investigated the epidemiology of UTI, antimicrobial susceptibility, and resistance patterns of bacterial isolates from adult diabetic patients. Methods: A cross-sectional study was conducted at Khartoum Hospital, Sudan during the period of March - September 2013. Consecutive patients (men and women) were approached to participate in the study, irrespective of UTI symptoms. Socio-demographic and clinical data were obtained from each participant using pre-tested questionnaires. Clean-catch, midstream urine samples were collected and cultured for UTI diagnosis and antimicrobial susceptibility. Symptomatic bacteriuria was defined as a positive urine culture (≥105 colony-forming units [CFU]/mL of a single bacterial species) from patients with symptoms associated with UTI; asymptomatic bacteriuria was defined as a positive urine culture from patients without symptoms associated with UTI. Results: A total of 200 diabetic patients were enrolled, 121 (60.5%) men and 79 (39.5%) women; 193 (96.5%) had type II DM. The overall prevalence of UTI was 39 (19.5%). Among the total population, 17.1% and 20.9% had symptomatic and asymptomatic bacteriuria, respectively. According to multivariate logistic regression, none of the investigated factors (age, sex, type of DM and duration) were associated with UTI. The predominant isolates were Escherichia coli (22, [56.4%]), and Klebsiella pneumoniae, [9, (23%)]. Eight of 22 E. coli, four of nine K. pneumoniae and one of five Enterococcus faecalis isolates originated from symptomatic patients. Six, four, three, and two of 22 E. coli isolates showed resistance to ampicillin, co-trimoxazole, nitrofurantoin, and amoxicillin-clavulanic acid, respectively. Two, two, one and one of nine K. pneumoniae isolates were resistant to ampicillin, co-trimoxazole, cephalexin, and amoxicillin-clavulanic acid. All 22 E. coli isolates were sensitive (100%) to gentamicin and cephalexin. All nine K. pneumoniae were sensitive to gentamicin (100%) and 88.8% were sensitive to cephalexin. Conclusion: In Sudan, about one-fifth of diabetic patients have UTI. E. coli is the most frequent isolate followed by K. pneumoniae. © 2015 Hamdan et al.; licensee BioMed Central.

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.

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