Evaluation of partial discharge resistance of insulating sheets produced in Saudi Arabia under alternating stress

A.A. Al-Sulaiman 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.S1

This paper deals with the comparison of partial discharge (PD) characteristics of three kinds of insulating sheets produced by the local industry in Saudi Arabia; namely polycarbonate (PC), poly-methylmetacrylate (PMMA) and phenoplast resin (Bakelite). These were exposed to PDs under the IEC (b) electrode system, and the comparison was judged by the discharge onset; discharge propagation area, PD magnitude, surface erosion and elemental analysis of eroded zones. Results show that PD inception voltage is inversely proportional to the sample’s relative permittivity. For higher permittivity samples, the eroded area under a constant voltage is larger, while PD activity is also augmented significantly. The erosion depth was found to be deeper in Bakelite. In this case, the scanning electron microscope images show a larger concentration of scattered debris of the base material on the eroded area. Whereas, EDX elemental analysis of these areas exhibits presence of the native matrix for PC and PMMA sheets, a large content of copper and zinc was found on the Bakelite sheet, which also displays the erosion of the electrode.

Wet Cupping — Traditional Hijamah Technique versus Asian Cupping Technique in Chronic Low Back Pain Patients: A Pilot Randomized Clinical Trial

Sulaiman M. Al-Eidi,Ashry Gad Mohamed,Raid A. Abutalib,Abdullah M. AlBedah,Mohamed K.M. Khalil 사단법인약침학회 2019 Journal of Acupuncture & Meridian Studies Vol.12 No.6

To evaluate the feasibility of comparing the effect of the traditional Hijamah and the Asian wet cupping techniques in the management of patients with chronic low back pain (CLBP), a randomized clinical trial comparing traditional and Asian wet cupping techniques for CLBP was conducted in two secondary care hospitals in Saudi Arabia. Seventy eligible participants with CLBP were randomized to receive one session of wet cupping using either Asian technique (34 patients) or traditional Hijamah technique (36 patients). Cupping was performed at four sites of the bilateral bladder meridian (BL23, BL24, and BL25). The numeric rating scale, Present Pain Intensity, and Oswestry Disability Questionnaire scores were measured immediately after intervention, at seven days, and 14 days after intervention. In both groups, there was a significant decrease in the numeric rating scale, Present Pain Intensity, and Oswestry Disability Questionnaire scores, immediately after intervention, at seven days, and 14 days after intervention. However, there was no significant difference between the two groups across all the outcome measures up to 14 days after intervention. The study did not show a superiority of one technique compared with the other. Longer follow-up periods and more than one cupping session may be needed to evaluate the difference, if any, between both the techniques. Trial Registration: NCT02012205.

Modelling CO₂ and NO<SUB>x</SUB> on signalized roundabout using modified adaptive neural fuzzy inference system model

Ghassan Sulaiman,Mohammad K. Younes,Ghassan A. Al-Dulaimi 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.1

Air quality and pollution have recently become a major concern; vehicle emissions significantly pollute the air, especially in large and crowded cities. There are various factors that affect vehicle emissions; this research aims to find the most influential factors affecting CO₂ and NOx emissions using Adaptive Neural Fuzzy Inference System (ANFIS) as well as a systematic approach. The modified ANFIS (MANFIS) was developed to enhance modelling and Root Mean Square Error was used to evaluate the model performance. The results show that percentages of CO₂ from trucks represent the best input combination to model. While for NOx modelling, the best pair combination is the vehicle delay and percentage of heavy trucks. However, the final MANFIS structure involves two inputs, three membership functions and nine rules. For CO₂ modelling the triangular membership function is the best, while for NOx the membership function is two-sided Gaussian.

Monitoring and Identification of Various Glucose Levels of Diabetes Patients Using Edge Based Machine Learning Approach

Maheshwari A.,Hemalatha B.,Lakshmi G.,Kavitha A.,Tata Ravi Kumar,Taqui Syed Noeman,Al Obaid Sami,Alharbi Sulaiman Ali,Raghavan S. S. 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3

The diabetes is a disease that can become a serious disorder for a lifetime. It kills more than a million people every year. This disease can afect anyone. Diabetes occurs when the body is unable to process all the sugar (glucose) in the bloodstream; its complications can move to heart issues, caress, vision loss, and kidney stoppage and leg amputation problems. Many people with diabetes inject their body daily and feel that their work is done. Diabetes is an incurable disease because of poor health. The diabetes be able to be divided keen on2 types. The type-1 diabetes is hereditary. It is not easy to cure. People with type 2 diabetes can greatly reduce their risk of developing diabetes by following a proper, proper lifestyle. In addition it helps reduce the risk of diabetes. The proposed model of managing diabetics explains this disease as a specifc lifestyle. The existence of an efective system for the treatment of diabetes, according to the tasks currently set out, provides for the achievement of goals. The proposed edge based machine learning approach was achieved 85% of results compared with the Blood glucose level prediction, Adaptive multivariable closed-loop control, neural model of blood glucose level and Detecting Undiagnosed Diabetes.

Clinical Presentations and Phenotypic Spectrum of Multiple Sclerosis at a University Hospital in Saudi Arabia

Saima Nazish,Rizwana Shahid,Azra Zafar,Foziah Alshamrani,Abdullah Al Sulaiman,Majed Alabdali,Danah Aljaafari,Esraa Al Wabar,Fahd A Alkhamis 대한신경과학회 2018 Journal of Clinical Neurology Vol.14 No.3

Background and Purpose The objective of this study was to determine the frequencies of different clinical presentations and the phenotypic spectrum of multiple sclerosis (MS). Methods This cross-sectional study was performed in the Neurology Department of King Fahd Hospital of University Alkhobar in the Kingdom of Saudi Arabia (KSA). Data of 190 MS patients who fulfilled the McDonald criteria were retrieved from medical records and analyzed. Results The age at disease onset was 26.27±8.2 years (mean±SD) and disease duration was 6.38±5.10 years. The male-to-female ratio was 1:1.6. Optic neuritis and myelitis were the most-frequent first clinical presentations. Sensory (73.1%), motor (61%), and visual (58.4%) symptoms were the most-frequent established clinical symptoms. Relapsing-remitting multiple sclerosis (RRMS) was present in 75% of the cases. Supratentorial T2-weighted white-matter lesions and deep-gray-matter or juxtacortical lesions were the most-frequent magnetic resonance imaging (MRI) lesions, comprising 28% and 23.7% of all MRI lesions observed in 93.6% and 79.4% of the cases, respectively. The scores on the Expanded Disability Status Scale were within the range of 1.0–5.5 in 82.1% of the patients. There were 145 (76.3%) patients taking interferon β therapy. Conclusions MS presenting in the hospital setting is more common in KSA than reported previously, and the number of diagnosed cases in increasing. It is therefore an emerging and disabling neurological illness in KSA with clinical characteristics not dissimilar to those in other middle eastern countries. A decrease in the frequency of patients with secondary progressive multiple sclerosis (SPMS) indicates either that more new cases of RRMS are being diagnosed or that adequate treatments of RRMS are preventing the evolution to SPMS. Further larger and populationwide epidemiological and clinical studies with the long-term follow-up of MS patients are required to better assess the clinical spectrum of MS in KSA.

Influence of toluene–tetramethylbenzene transalkylation on heavy aromatics conversion to xylenes

Sulaiman S. Al-Khattaf,Syed A. Ali,Mogahid S. Osman,Abdullah M. Aitani 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

Transalkylation of toluene–tetramethylbenzene (TeMB) over MOR and BEA was investigated at 250–400 8C. Conversion of TeMB was higher than trimethylbenzene (TMB) and toluene. Xylene yield was inthe following order: ½toluene TMB TeMB >½toluene TeMB >½toluene TMB ½toluene . Kineticmodeling for reaction network consisting of toluene–TeMB transalkylation; toluene disproportionation;and toluene–TMB transalkylation was carried out. Toluene–TeMB transalkylation rate was >50% higherthan the toluene–TMB transalkylation while the toluene disproportionation was an order of magnitudeslower than transalkylation reactions. An addition of 5–10 wt.% TeMBs to the heavy reformate causedminor impact on the xylene yield but an improvement in xylene selectivity.