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Search Results: 1 - 10 of 21029 matches for " Abdullah Al-Farqani "
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Accessory mitral valve tissue causing severe left ventricular outflow tract obstruction in a post-Senning patient with transposition of the great arteries
Prashanth Panduranga,Thomas Eapen,Salim Al-Maskari,Abdullah Al-Farqani
Heart International , 2011, DOI: 10.4081/hi.2011.e6
Abstract: Accessory mitral valve tissue is a rare congenital anomaly associated with congenital cardiac defects and is usually detected in the first decade of life. We describe the case of an 18-year old post-Senning asymptomatic patient who was found to have accessory mitral valve tissue on transthoracic echocardiography producing severe left ventricular outflow tract obstruction.
On the Contribution of Student Experience Survey Regarding Quality Management in Higher Education: An Institutional Study in Saudi Arabia  [PDF]
Abdullah Al Rubaish
Journal of Service Science and Management (JSSM) , 2010, DOI: 10.4236/jssm.2010.34052
Abstract: We appraise comparatively and analytical data under Student Experience Survey (SES) to discuss the possible generalizability of related College level differentials in Saudi Arabia. For this, data collected from students of two academic programs namely Bachelor of Dental Surgery, College of Dentistry; and B.Sc. Nursing, College of Nursing, University of Dammam, Dammam, Saudi Arabia, were considered. These data relate to experience of students halfway of respective academic program. The percentage of participation in SES by students was 100% and 94% respectively. Students of neither the programs reported high quality perception about any of the 20 items considered under SES. With a target of satisfaction by at least 50% students, students from College of Nursing expressed better satisfaction than those from the College of Dentistry. Same is true in case of aiming to achieve satisfaction by at least 75% students. However, to gain satisfaction by at least 80% students, each of the 20 items in both colleges need focus of college as well as university administrators towards required improvements. In summary, suitable to its varying environment, each program/college in a university requires specific improvement planning.
A Comparative Appraisal of Timings for Program Evaluation Survey and Related Institutional Results in Saudi Arabia: Quality Management in Higher Education  [PDF]
Abdullah Al Rubaish
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.42022
Abstract: The periodic evaluation of academic programs is mandatory for quality management in higher education world-wide. This paper reports a unique setting in which each student performed two such evaluations using structured question-naires, viz.:(a) “Student Experience Survey” (SES) for their learning experience halfway through their academic pro-gram, and (b) “Program Evaluation Survey” (PES) at end of the program. A comparative appraisal of these two sets of data from students doing the Bachelor of Dental Surgery, College of Dentistry, University of Dammam, Saudi Arabia, aims to see if it is valid to generalize the observed related differentials in Saudi Arabia. The percentage of students’ participation was 100% in both SES and PES. In the students’ perceived cumulative experience, none of the total 20 items in SES was reported to be of either “high” or “acceptable” quality. By contrast, in the PES, one of the 13 items common to both questionnaires was reported to be of “high quality (“what I have learnt in this program will be valu-able for future”)”. Again, one of nine additional items in PES (“Developed knowledge & skill for my chosen career”) emerged to be of acceptable quality. In summary, irrespective of timing for PES, the results suggest the need of im-provements in relation to almost every item confirming ongoing developmental phase.
The Usefulness of Global Student Rating Items under End Program Evaluation Surveys in Quality Improvements: An Institutional Experience in Higher Education, Saudi Arabia  [PDF]
Abdullah Al Rubaish
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.34047
Abstract: Program evaluation survey (PES) by students in higher education is one of the range of evaluations of academic programs. Others are course evaluation, teaching skills evaluation; and surveys of facilities and services. The present study employs the available PES data collected in colleges of Dentistry and Medicine, University of Dammam (UD), Saudi Arabia. Our PES relates to students’ experience at the end of their academic program. The present paper analyses these data and discusses the usefulness of global item results vis-à-vis individual item results in quality improvements of higher education. The respective percentage of participating students was 100 and 65. The PES results revealed that in view of poorly graded global items results, there is need of focus on global item results, leading to continuing improvements in all the areas covered in the questionnaire.
Denoising of an Image Using Discrete Stationary Wavelet Transform and Various Thresholding Techniques  [PDF]
Abdullah Al Jumah
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.41004

Image denoising has remained a fundamental problem in the field of image processing. With Wavelet transforms, various algorithms for denoising in wavelet domain were introduced. Wavelets gave a superior performance in image denoising due to its properties such as multi-resolution. The problem of estimating an image that is corrupted by Additive White Gaussian Noise has been of interest for practical and theoretical reasons. Non-linear methods especially those based on wavelets have become popular due to its advantages over linear methods. Here I applied non-linear thresholding techniques in wavelet domain such as hard and soft thresholding, wavelet shrinkages such as Visu-shrink (non-adaptive) and SURE, Bayes and Normal Shrink (adaptive), using Discrete Stationary Wavelet Transform (DSWT) for different wavelets, at different levels, to denoise an image and determine the best one out of them. Performance of denoising algorithm is measured using quantitative performance measures such as Signal-to-Noise Ratio (SNR) and Mean Square Error (MSE) for various thresholding techniques.

Synthesis, Spectroscopy and Electrochemistry of New 3-(5-Aryl-4,5-Dihydro-1H-Pyrazol-3-yl)-4-Hydroxy-2H-Chromene-2-One 4, 5 as a Novel Class of Potential Antibacterial and Antioxidant Derivatives  [PDF]
Abdullah Sulaiman Al-Ayed
International Journal of Organic Chemistry (IJOC) , 2011, DOI: 10.4236/ijoc.2011.13014
Abstract: 3-((2E)-3(aryl)prop-2-enoyl)-2H-chromen-2-one 3 was synthesized from 4-hydroxy coumarin by refluxing 3-acetyl-4-hydroxy coumarin with aromatic aldehydes in chloroform in the presence of a catalytic amount of piperidine. 3 was converted to pyrazoles 4, 5 by treatment with hydrazine and phenylhydrazine in toluene, respectively. The structures of the new compounds were confirmed by elemental analysis, IR, and multinuclear/multidimensional NMR spectroscopy (1H, 13C-NMR, NOESY, HMBC) which allowed us to assign the complete network of proton and carbon atoms. All the compounds exhibited one quasireversible redox process. All the newly synthesized compounds were screened for their antibacterial and antioxidant activities. Antimicrobial studies revealed that 3-(5-(2,5-dimethylphenyl)-1-phenyl-4,5-dihydro-1H-pyrazol-3-yl)-4- hydroxy-2H-chromene-2-one 5c showed significant antibacterial activity against Escherichia coli and Pseudomonas Aeruginosa 27853. Furthermore, 3-(5-(aryl)-4,5-dihydro-1H-pyrazol-3-yl)-4-hydroxy-2H-chromene- 2-ones 4, 5 showed antioxidant activities of different extents with respect to individual compounds as well as to the antioxidant methods. The 3-(5-(phenyl)-4,5-dihydro-1H-pyrazol-3-yl)-4-hydroxy-2H-chromene-2-ones 4a was found to be the most active antioxidant in the series and more active than trolox which makes the investigated complexes a new promising class of antibacterial compounds.
Measurement and Analysis of Extremely Low Frequency Electromagnetic Field Exposure in Oman  [PDF]
Abdullah H. Al-Badi
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.48046
Abstract: Concern about the possible health effects from exposure to extremely low frequency (ELF) electromagnetic fields is increasing worldwide. This paper presents analyses of measurements of low frequency magnetic and electric fields caused by conductors carrying current in the Oman electric power system. Measurements were taken during the summer period at around 3 PM to capture peak loads. Field measurements were from several high voltage environments which including different types of electricity infrastructure including overhead lines, underground cables and substations. The measured values were compared to the International Commission on Non-Ionizing Radiation Protection (ICNIRP) standards for both general public and occupational exposure. All the Oman values of electric and magnetic fields are lower than the recommended values provided by ICNIRP.
EER Improvement for Room Air-Conditioners in Saudi Arabia  [PDF]
Abdullah M. Al-Shaalan
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.46058
Abstract: This paper demonstrates the possibility of achieving a higher Energy Efficiency Ratio (EER) for Room Air Conditioners (RACs) that complies with the Saudi energy efficiency standards and satisfies the energy conservation requirements for the Saudi Building Code (SBC). This study considers several design options for improving the performance and efficiency of the RAC in comparison with a baseline RAC unit manufactured by Al-Zamil Company of Saudi Arabia. These design options include the number of condenser and evaporator rows, fins density, frontal area, compressor types, and refrigerant types. The experimental data obtained is through testing the units in Calorimeter according to standard ASHRAE-16. Also, the uncertainty in measurements and its propagation are included in this study. This paper reports the results of a set of measurements carried out on a modified RAC and compares them with the tested baseline RAC unit at similar load conditions. The experimental results indicate the effectiveness of increasing the number of condenser rows in comparison with other design options considered for achieving higher EER for RACs.
Technical and Economical Merits of Power Systems Interconnection  [PDF]
Abdullah M. Al-Shaalan
Journal of Power and Energy Engineering (JPEE) , 2013, DOI: 10.4236/jpee.2013.14004

This work aims at exploring the effects of the interconnection between isolated electric power systems upon some important aspects such as enhancing reliability levels along with reducing installation and operation costs. To discern the advantages associated with this study, the developed methodology has been applied to three existing power systems in the northern region of the Kingdom of Saudi Arabia presently within the concession domain of the Saudi Electric Company (SEC). These systems have been established to meet the present loads and to withstand future electrical demands for a period of time before additional generation and transmission reinforcements are needed. In this work, reliability measures have been utilized to determine the period that these systems can fulfill the present and future loads without affecting the reliability levels and the threshold that an additional capacity should be added to maintain those required reliability levels. In application to the reliability criteria, technical, operational and economic advantages can be realized, i.e., higher reliability levels and lower installation and operation costs after the proposed interconnection between these selected isolated power systems take place.

Nutritional and Safety Evaluation of Local Weight-Gain Formulas in the Kingdom of Saudi Arabia (KSA) Markets  [PDF]
Nora Abdullah Al-Faris
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.514146

This study was conducted to examine the nutritional content, contamination levels, and biological effects of 3 local prepared formulas. Formula (1) contained mixed nuts; formula (2) contained moghat, honey and royal jelly, while formula (3) contained honey, fenugreek and royal jelly. Groups of albino rats (90 rats) were randomly allocated to diets of control group or 1 - 3 treatment groups. The tested diets contained 15% carbohydrate. The weight and food intake were recorded. Blood tests were conducted to determine total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, triglycerides, glucose, urea, creatinine, white blood cell count (WBC), red blood cell count (RBC), haemoglobin (HB), mean corpuscular volume (MCV), and haematocrit (HCT). Results showed that bacterial contamination was found in formula (1) and formula (3). Fungal contamination was detected in formula (2) and formula (3). Body weight increased significantly in the rats fed treatment formulas compared to the control group. The blood tests indicated significant increases in the levels of glucose, WBC, HCT, total cholesterol, LDL cholesterol, and triglycerides as well as a significant decrease in HDL level in the group (2) was fed formula (1) the control. In conclusion, these findings indicate that these local formulas may not be safe, and further studies are required to understand the consequences of a long-term consumption of these formulas.

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