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- 저자 : Abdullah Al Sulaiman (검색결과 4 건)
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Linear and Nonlinear Behavior of Steel Buildings with Different Bracing Systems
Sulaiman Al-Safi,Ibrahim Alameri,Waleed Abdullah Wasel,Amjad Basheer Al-kadasi 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.2
In this study, the eff ects of wind and seismic loads on 5, 10, and 15 story steel buildings with diff erent bracing systems were investigated. Linear static and nonlinear dynamic analyses were performed to assess the base shear, base moment, and story drift for all bracing systems. In addition, the cost analysis was taken into consideration. Five structural confi gurations were used: V-bracing, inverted V-bracing, one-story X-bracing, and multistory X-bracing. One of the most important features of a building is lateral stiff ness, which defi nes the resistance to displacement under seismic and wind loads, at the same time, the lateral stiff ness has a major impact on the natural time of the structure. Reducing displacement and cost in the structures indicates that the design is safe and economical. Therefore, the purpose of this article is to fi nd the best bracing system that causes minimum displacement, which indicates maximum lateral stiff ness. From this point of view, the behavior of bracing systems exposed to wind and seismic loads in buildings with diff erent stories was investigated. Static linear analysis results showed that the best bracing systems to reduce lateral displacement were the one-story X-bracing system for 5 and 15 story buildings and the V-bracing system for 10 story buildings. On the other hand, nonlinear dynamic analysis results showed that lateral displacement was minimum in unbraced, V-bracing, and one-story X-bracing systems for 5, 10, and 15 stories, respectively.
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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.
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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.
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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.
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