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- 저자 : Mohamed Ismael (검색결과 4 건)
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Altered Spinal Excitability in Patients with Primary Fibromyalgia: A Case-Control Study
Mohamed N. Thabit,Ahmad Eza,Mohamed A. Ismael,Saber Hadad 대한신경과학회 2021 Journal of Clinical Neurology Vol.17 No.1
Background and Purpose Abnormal excitability of the central nervous system, both spinal and supraspinal, has previously been described as a pathophysiological plastic mechanism for chronic pain syndromes. Primary fibromyalgia (FM) as one extreme of this spectrum of diseases. This case-control study aimed to determine the changes in the spinal excitability by investigating the Hoffman reflex (H-reflex) in patients with FM. Methods Thirty-eight patients with FM and 30 healthy controls participated in this case-control study. We measured the H-reflex bilaterally in the upper limbs (flexor carpi radialis) and the lower limbs (gastrocnemius and soleus). Moreover, pain-related variables were measured, including pain severity (using a visual analogue scale), pain duration, Widespread Pain Index, and the score on the Symptom Severity Scale. Various psychiatric comorbidities and qualityof- life parameters were measured for each patient, including scores on the Hamilton Depression Rating Scale, Taylor’s Manifest Anxiety Scale, and the Revised Fibromyalgia Impact Questionnaire. Results A significant increase in the ratio of the maximum baseline-to-peak amplitudes of H and M waves (Hmax/Mmax) but not in the H-wave minimum latency was found in patients with FM compared with healthy controls. There were no significant correlations between this ratio in both muscles and the various pain-related measures, psychiatric comorbidity, and quality of life in patients with FM. Patients with FM suffered more depression and anxiety than did the controls. Conclusions We found increased spinal excitability in patients with FM, which was not confined to the site of maximum pain. This information may help in the diagnosis of FM and supports the hypothesis of central sensitization.
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Experimental and numerical FEM of woven GFRP composites during drilling
Mohamed S. Abd-Elwahed,Usama A. Khashaba,Khaled I. Ahmed,Mohamed A. Eltaher,Ismael Najjar,Ammar Melaibari,Azza M. Abdraboh 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.5
This paper investigates experimentally and numerically the influence of drilling process on the mechanical and thermomechanical behaviors of woven glass fiber reinforced polymer (GFRP) composite plate. Through the experimental analysis, a CNC machine with cemented carbide drill (point angles =118° and 6 mm diameter) was used to drill a woven GFRP laminated squared plate with a length of 36.6 mm and different thicknesses. A produced temperature during drilling “heat affected zone (HAZ)” was measured by two different procedures using thermal IR camera and thermocouples. A thrust force and cutting torque were measured by a Kistler 9272 dynamometer. The delamination factors were evaluated by the image processing technique. Finite element model (FEM) has been developed by using LS-Dyna to simulate the drilling processing and validate the thrust force and torque with those obtained by experimental technique. It is found that, the present finite element model has the capability to predict the force and torque efficiently at various drilling conditions. Numerical parametric analysis is presented to illustrate the influences of the speeding up, coefficient of friction, element type, and mass scaling effects on the calculated thrust force, torque and calculation’s cost. It is found that, the cutting time can be adjusted by drilling parameters (feed, speed, and specimen thickness) to control the induced temperature and thus, the force, torque and delamination factor in drilling GFRP composites. The delamination of woven GFRP is accompanied with edge chipping, spalling, and uncut fibers.
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Younis Mohammed Salih,Mudhaffer Mustafa Ameen,Fahmi F. Muhammadsharif,Mohammad Fadhli Ahmad,Nor Aieni Haji Mokhtar,Ismael Mohammed Mohammed Saeed,Md. Nurul Islam Siddique,Ahmad Nazri Dagang,Salisa Abd 한국광학회 2020 Current Optics and Photonics Vol.4 No.2
The impact of graphene and poly(methyl methacrylate) (PMMA) substrates on the response of a fiber Bragg grating (FBG) due to mechanical deflection was investigated. For this purpose, four FBGs with grating lengths of 5, 15, 25, and 35.9 mm were utilized. Higher sensitivity was found for FBGs of larger grating length and for those bonded to graphene substrate. It was concluded that FBGs of smaller grating length (5 and 15 mm) were more sensitive in compression mode, while those of larger grating length (25 and 35.9 mm) were seen to be highly sensitive in tension mode.
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Ultra-trace copper(II) detection and removal from wastewater using novel meso-adsorbent
Md. Rabiul Awual,Mohamed Ismael,Md. Abdul Khaleque,Tsuyoshi Yaita 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The functionalized mesoporous silica based meso-adsorbent was developed for ultra-trace Cu(II) detection and removal from wastewater. The meso-adsorbent was fabricated by direct immobilization of N,N-bis(salicylidene)1,2-bis(2-aminophenylthio)ethane onto mesoporous silica monoliths. The calcu-lated HOMO–LUMO small energy gap suggested that the electrons excitation according to the electron/energy transfer mechanism was evident in the intense of color complexation during selective detection and removal. The adsorbent was successfully applied in the determination and removal of Cu(II) ions in environmental samples. Therefore, the meso-adsorbent has been shown to have the potential to be used as an effective adsorbent for trace Cu(II) capturing from wastewater.
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