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含体外索的预应力工字钢梁抗弯性能非线性有限元分析

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含体外索的预应力工字钢梁抗弯性能非线性有限元分析

作者：桑敏（hazem SAMIH ABD-ELBASET MOHAMED）华中科技大学

学位级别：硕士

通过外部预应力钢筋施加预应力是强化钢结构及控制整体变形的有效技术之一，这项技术可应用于新型结构及现有结构的修复。本文将利用三维非线性有限元分析研究预应力简支工字钢梁（通过外部无粘结预应力钢筋施加预应力）的结构响应及... 详细信息

通过外部预应力钢筋施加预应力是强化钢结构及控制整体变形的有效技术之一，这项技术可应用于新型结构及现有结构的修复。本文将利用三维非线性有限元分析研究预应力简支工字钢梁（通过外部无粘结预应力钢筋施加预应力）的结构响应及预应力效应对抗弯性能的影响，同时利用ANSYS对预应力施加过程进行有限元的分析与模拟。钢材的力学性能用双线性各向同性塑性模型模拟，其收敛准则为牛顿法。梁跨度1/1000的初始缺陷及空载梁的屈曲模态二者作为初始条件研究其对结构性能的影响。由于外部预应力钢筋张拉过程及模型坐标位置的影响，上下翼缘在施加预应力后需考虑“侧向约束”效应。本文由两大部分组成，第一部分为模型与现有试验结果的验证分析，结果证明利用ANSYS进行的预应力钢梁有限元分析结果与试验结果符合较好。第二部分为简支工字钢预应力梁的参数分析，该部分将分析五个因素对30米跨预应力梁整体性能的影响，这五个因素分别为致偏装置的数量、外部预应力钢筋的偏心、预应力技术、钢筋形状、荷载类型等。在每次分析中，采用改变其中一种因素而其他因素保持不变的方法来研究该种因素对梁整体性能的影响。

关键词： ANSYS 抗弯性能外部预应力施加技术钢筋致偏装置

Studies on Degradation of Diquat Pesticide in Aqueous Solutions Using Electrochemical Method

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American Journal of Analytical Chemistry 2012年第2期3卷 99-105页

作者： Nasser Abu Ghalwa hazem M. Abu-Shawish Mazen Hamada Khaled Hartani Abed Al Hakem Basheer Chemistry Department Al-Azhar University Gaza Palestine Chemistry Department College of Sciences Al-Aqsa University Gaza Palestine

The C/PbO2 electrode assisted electrochemical removal of diquat dibromide herbicides solutions has been the subject of the present investigation under several operating conditions. The optimum conditions of the treatment process are: current density of 150 mA/cm2, pH 2.2, NaCl concentration 2 g/L, temperature of 10?C and initial diquat concentration of 50 mg/L. The time of electrolysis is 60 min for degradation rate of diquat and chemical oxygen demand (COD) removal is 210 min. The results were obtained by UV-Vis spectrophotometer and the present designed electrode was coincident.

关键词： Carbon Paste Electrode Herbicide C/PbO2 Electrode Electrooxidation Diquat Dibromide

Genetic characterization of FSH beta-subunit gene and its association with buffalo fertility

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Asian pacific Journal of Reproduction 2017年第5期6卷 193-196页

作者： Ahmed S.A.Sosa Karima Gh M.Mahmoud Mohamed M.M.Kandiel hazem A.A.Eldebaky Mahmoud F.Nawito Mahmoud E.A.Abou El-Roos Department of Animal Reproduction&A.I National Research CentreDokkiTahrir Street12622 GizaEgypt Department of Theriogenology Faculty of Veterinary MedicineBenha UniversityKaliobiaEgypt

Objective:To study genetic variation in buffalo follicle stimulating hormone beta-subunit (FSHB) gene and its association with ***: In this experimental study, blood samples were collected by standard methods using EDTA anticoagulant and transrectal ultrasound examination was conducted on fertile (n=74) and infertile buffaloes with a history of anestrum (n=30) or repeat breeding (n=12). The genomic DNA was extracted for PCR followed by single strand conformation polymorphism analysis. DNA sequencing was performed for the determination of single nucleotide polymorphism ofFSHB ***:The study results showed that there was genetic polymorphism with two different single strand conformation polymorphism patterns, AA and AB. The former pattern was associated with fertility in Egyptian buffaloes. Pair wise alignment of the two patterns sequences revealed that FSHB pattern II (AB) has C nucleotide insertion as SNP at the site of 208 bp of sequenced ***:FSHB is polymorphic in the infertile Egyptian buffaloes, suggesting its practicability as a candidate marker for female fertility.

关键词： Buffalo FSH beta-subunit gene Nucleotide sequences SSCP analysis

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噬菌体在食品安全控制中的研究进展

食品科学 2018年第15期39卷 240-246页

作者：吕阳尹平 Khairy Morsy MOHAMED 高磊袁超周洋邱宁邹璐瑶李志 Abdelnabby hazem 王小红李锦铨华中农业大学食品科学技术学院湖北武汉430070 本哈大学农学院食品科学系埃及本哈11435 华中农业大学理学院湖北武汉430070 华中农业大学水产学院湖北武汉430070 农业微生物学国家重点实验室湖北武汉430070

近年来,噬菌体在食品科学领域中的应用受到国内外研究学者的广泛关注。噬菌体的自身特性表明,其可作为一种杀菌/抑菌的生物制剂来控制食源性病原菌对食品的污染,是保障食品安全的理想工具。此外,基因工程技术的发展进一步促进了噬菌体... 详细信息

近年来,噬菌体在食品科学领域中的应用受到国内外研究学者的广泛关注。噬菌体的自身特性表明,其可作为一种杀菌/抑菌的生物制剂来控制食源性病原菌对食品的污染,是保障食品安全的理想工具。此外,基因工程技术的发展进一步促进了噬菌体及其产物的安全、高效使用及噬菌体产品的出现。本文就噬菌体在食品安全控制中的研究进展以及应用前景等方面进行综述。

关键词：噬菌体食源性病原菌食品安全控制基因工程

Efficacy and safety of peroral endoscopic myotomy after prior sleeve gastrectomy and gastric bypass surgery

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World Journal of Gastrointestinal Endoscopy 2020年第12期12卷 532-541页

作者： Jennifer M Kolb Daniel Jonas Mateus Pereira Funari hazem Hammad Paul Menard-Katcher Mihir S Wagh Division of Gastroenterology University of Colorado-DenverAuroraCO 80045United States Department of Internal Medicine University of Colorado HospitalAuroraCO 80045United States Gastrointestinal Endoscopy Unit Hospital das Clinicas da Faculdade de Medicina da Universidade de Sao PauloSao paulo 05403000Sao pauloBrazil Interventional Endoscopy Division of GastroenterologyUniversity of Colorado-DenverAuroraCO 80045United States

BACKGROUND Per-oral endoscopic myotomy(POEM)is safe and effective for the treatment of *** is limited data on performance of POEM in patients with altered upper gastrointestinal anatomy,especially after bariatric *** in patients with prior sleeve gastrectomy have not been *** To assess the efficacy and safety of POEM in patients with prior bariatric *** A prospective POEM database was reviewed from 3/2017-5/2020 to identify patients who underwent POEM after prior bariatric *** was assessed by technical success(defined as the ability to successfully complete the procedure)and clinical success[decrease in Eckardt score(ES)to≤3 post procedure].Safety was evaluated by recording adverse *** Six patients(50%male,mean age 48 years)with a history of prior bariatric surgery who underwent POEM were *** had prior sleeve gastrectomy(SG)and three prior Roux-en-Y gastric bypass(RYGB).Four patients had achalasia subtype II and 2 had type ***(4)patients had undergone previous achalasia *** success was 100%.Clinical success was achieved in 4(67%)patients at mean follow-up of 21 *** one of the clinical failures,EndoFLIP evaluation demonstrated adequate treatment and candida esophagitis was noted as the likely cause of *** were no major adverse *** POEM is technically feasible after both RYGB and SG and offers an effective treatment for this rare group of patients where surgical options for achalasia are limited.

关键词： Obesity Bariatric surgery Achalasia Peroral endoscopic myotomy Sleeve gastrectomy Gastric bypass

Clinical Characteristics of Headache in Egyptian Patients with Idiopathic Epilepsy

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Journal of Behavioral and Brain Science 2019年第3期9卷 144-153页

作者： Mohamed A. Sayed hazem K. Ibrahim Alaaeldin Sedky Bekhit Mohamed N. Thabit Mostafa Abdelmomen Department of Neurology Sohag University Hospital Sohag University Sohag Egypt

Purpose: Headache and epilepsy are common neurological disorders and their relationship is still incompletely known. The purpose of our work was to estimate the most common types of primary headache syndromes and its relation to seizure timing in epileptic patients in Upper Egypt. Patients & Methods: In a cross-sectional study, we evaluated headaches in 100 consecutive patients with idiopathic epilepsy attending the neurology outpatient clinic and the epilepsy clinic at Sohag university hospital by complete medical history, physical and neurologic examination EEG and CT brain. Results: Of our study population, 78% of patients with epilepsy reported headaches. Migraine occurred in 70.6% of patients with headache followed by tension-type headache in 25.58% of patients and other types of headaches occurred in 2.56% of patients. There were 8 patients (10.1%) had a pre-ictal headache, 52 patients (66.5%) had a postictal headache and 39 patients (50%) had an interictal headache. In our study, we found that the occurrence of headache being linked to the female sex, lower mean age, lower mean age at the onset of epilepsy, focal epilepsy, longer duration of epilepsy, high frequency of seizures and the use of polytherapy of antiepileptics. Conclusion: Headache especially migraine is an important comorbidity of epilepsy and should receive more attention especially in female patients, patients with younger age, lower mean age at epilepsy onset, longer duration of the disease, patients on polytherapy, patients with higher frequency of seizures and patients with focal epilepsy.

关键词： Epilepsy Headache Migraine Preictal Headache Interictal Headache Postictal Headache

How to Design Economic Predictive Laboratory Panel Evaluating Acute Ischemic Stroke Outcome

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Neuroscience & Medicine 2019年第1期10卷 1-14页

作者： Hasnaa A. Abo-Elwafa hazem K. Ibrahim Hassan M. El-Nady Asmaa H. Abbas Clinical Pathology Faculty of Medicine Sohag University Sohag Egypt Neurology Department Faculty of Medicine Sohag University Sohag Egypt

Background: acute ischemic stroke (AIS) remains the third cause of death and disability, and acute phase responses, both increasing international normalized ratio (INR) and activated partial thromboplastin time (APTT) are associated with worse outcome. Erythrocyte sedimentation rate (ESR) serves as severity marker, and non-fasting triglycerides (TG) indicates remnants of chylomicrons and very low density lipoproteins potentially pro-inflammatory. Aims: to design predictive economic panel evaluating AIS. Patients and methods: 100(AIS) patients were included, clinically evaluated by Scandinavian Stroke Scale (SSS) and Modified Rankin Score (MRS), subjected to complete blood count (CBC) on Cell-Dyne3700, manual ESR, INR and APTT on SYSMEX-CA1500, serum uric acid (SUA), serum albumin and non-fasting (TG) on Beckman Coulter AU480. Statistical analysis: STATA intercooled version 9.2. Results: odd ratio (OR), confidence interval (CI) of (MRS) in correlation to WBCs count in quartile (Q)3, 4 (OR 8.14, CI 2.29 - 8.90, significant P = 0.01;and OD13.5, CI 3.39 - 53.68, high significant P = 0.001 respectively), to APTT in Q3 (OD 4.15, CI 1.09 - 15.82, P = 0.04), SUA in Q3 (OD 0.19, CI 0.05 - 0.68, P = 0.01), TG in Q3,4 (OD 0.24 CI 0.06 - 0.88, P = 0.03;and OD 0.09, CI 0.02 - 0.34 P = 0.001 respectively) and serum albumin in Q3(OD 0.13, CI 0.04 - 0.51, P = 0.003), insignificant correlations to ESR, INR and platelets. Conclusion: according to (MRS), the economic predictive panel should be included WBCs, APTT, SUA, and non-fasting TG with serum albumin as prognostic tool evaluating functional disability in AIS.

关键词： Acute Ischemic Stroke Predictive Laboratory Panel

The Role of Chest X-Ray in Monitoring Lung Changes among COVID-19 Patients in Gaza Strip

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Open Journal of Medical Imaging 2021年第2期11卷 29-47页

作者： Mahmoud Mousa Marwan Matar Yasser Al Ajerami Ahmad Naijm Khalid Abu Shab Sadi Jaber Fouad SJaber hazem Dawoud Department of Radiology Gaza-European Hospital Gaza Strip Palestine Department of Medical Imaging Applied Medical Sciences Al-Azhar University Gaza Strip Palestine Department of Nursing Applied Medical Sciences Al-Azhar University Gaza Strip Palestine Department of Radiology Nasser Medical Complex Gaza Strip Palestine Valley Fever Institute UCLA Kern Medical Bakersfield USA Department of Chemistry and Biochemistry Ohio University Athens USA

Objective: To investigate the time course and findings severity of COVID-19 infection at chest radiography based on a 6-point radiological severity score, and correlates these with patients’ age and gender. Methods: This is a retrospective study of COVID-19 patients who were admitted at European Gaza Hospital and evaluated between October 6, 2020, and November 30, 2020. Baseline and serial chest radiographs, up to 4 images per patient, were reviewed and assessed for predominant pattern, side, and location of lung opacity. Utilized a 6-point scoring system, which divides the chest X-ray into 6 zones, to assess chest X-ray changes and correlate them with the severity of infection, age, and gender of patients. Results: The study included 136 COVID-19 patients: (51/136, 37%) were males and (85/136, 62.5%) were females, while age ranged from 7 months to 90 years with a mean age of 41.7 ± (19.5) years. Negative Chest x-rays were more observed than positive images. Ground-glass opacity was the most frequent pattern with a decreasing trend from 1st to 4th chest X-ray (from 33.8% to 3.7%), followed by consolidation (from 16.2% to 2.9%). Also, the commonest pattern of opacity was seen in peripheral areas (27/136, 19.9%), lower zone location (23/136, 16.9%), and bilateral opacity involvement (43/136;31.6%). No significant correlation was noticed between the patient’s gender, age, and severity score (P > 0.05). Conclusions: The 6-point chest X-ray severity score as a predictive tool in assessing the severity due to provide an assessment of the progression or regression pathway.

关键词： Chest X-Rays COVID 19 Lung Changes Scoring System Gaza Strip

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把张力轿直系统并入连续加工线

湘钢科技 1999年第4期 54-58,64页

作者： hazem.,TF 谭小斌