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Mesoporous Aerogels and Xerogls Based on Sulphated Zirconia Doped with Cobalt as Hexane Isomerization Catalysts

材料科学与工程（中英文A版） 2014年第3期4卷 105-111页

作者： Raissi Sahar Younes mohamed Kadri Ghorbel abdelhamid Laboratory of materials chemistry and catalysis University of Tunis El Manar Tunis 2092 Tunisia

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Childhood asthma biomarkers including zinc: An exploratory crosssectional study

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World Journal of Clinical Pediatrics 2024年第1期13卷 31-40页

作者： Hoda Atef Abdelsattar Ibrahim Mona Mohsen Boles Salep Aziz Hanna Dina Mahmoud Khaled mohamed abdelhamid El-Khashab Pediatric Clinical Nutrition Unit Faculty of MedicineCairo UniversityCairo 12613Egypt Department of Pediatrics Faculty of MedicineCairo UniversityCairo 12613Egypt Department of Clinical Pathology Faculty of MedicineCairo UniversityCairo 12613Egypt

BACKGROUND Childhood bronchial asthma(BA)is a chronic inflammatory respiratory *** conditions,including zinc deficiency,can affect such allergic *** To outline the difference in serum zinc levels between asthmatic children and healthy *** A cross-sectional study was carried out at Children’s Hospital,Cairo University,investigating serum zinc levels in children with BA(n=40)and healthy children(n=21).Other markers included serum ferritin,iron,hemoglobin(Hb),and immunoglobulin E(IgE)*** t-tests and Mann-Whinny tests were used for *** Kruskal-Wallis test was applied to compare serum ferritin and IgE levels with regard to asthma ***'s rank correlation was performed to explore the relationship between serum ferritin levels and both iron and Hb levels in asthmatic *** Children with BA had higher levels of zinc,yet the difference was not significant(P=0.115).Serum ferritin and IgE levels were significantly higher in asthmatic children(P=0.006 and 0.001,respectively),yet their levels did not differ significantly by severity(P=0.623 and 0.126,respectively).There was a nonsignificant weak correlation between serum ferritin levels and both serum iron and Hb *** Serum zinc levels do not seem to differ between asthmatic children and healthy *** ferritin levels may be a marker of asthma *** IgE levels are not markers of asthma severity.

关键词： Children Asthma Zinc Ferritin

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使用OCT评估中心性浆液性脉络膜视网膜病变患者脉络膜厚度的变化

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国际眼科杂志 2020年第4期20卷 583-588页

作者： Ragai Magdy Hatata mohamed abdelhamid Nassif Sherin Hassan Sadek 法雍大学眼科埃及法雍11435

目的:使用光谱域光学相干断层成像(SD-OCT)技术研究中心性浆液性脉络膜视网膜病变(CSCR)3mo后脉络膜厚度的变化。方法:前瞻性研究。共纳入60眼,20眼(平均年龄:33.65±5.24岁)典型急性单侧中心性浆液性脉络膜视网膜病变以及对侧正常眼,2... 详细信息

目的:使用光谱域光学相干断层成像(SD-OCT)技术研究中心性浆液性脉络膜视网膜病变(CSCR)3mo后脉络膜厚度的变化。方法:前瞻性研究。共纳入60眼,20眼(平均年龄:33.65±5.24岁)典型急性单侧中心性浆液性脉络膜视网膜病变以及对侧正常眼,20眼为健康对照组。进行荧光素血管造影和OCT检查。测量中心凹下脉络膜厚度(SFCT),黄斑中心凹视网膜厚度(CMT),到中央凹和视网膜下液1000μm处颞部和鼻部。结果:在三个不同的位置,三组间的SFCT差异有统计学意义。中心性浆液性脉络膜视网膜病变眼中心凹下脉络膜厚度(372.40±34.39μm)在基线和随访3mo后均显著大于对侧正常眼(302.10±8.9μm)和对照组眼(279.80±14.49μm)。CSCR眼平均CMT为317±141.86μm,并且SFCT与CMT呈显著正相关。结论:不同部位脉络膜厚度的增加,以及被称为“厚脉络膜”的过度扩张和高渗透血管,似乎在包括中心性浆液性脉络膜视网膜病变在内的广泛疾病中起着重要作用。

关键词：中心性浆液性脉络膜视网膜病变光学相干断层扫描脉络膜厚度厚脉络膜

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超声乳化对大豆分离蛋白稳定乳液理化性质的影响

超声乳化对大豆分离蛋白稳定乳液理化性质的影响

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作者： AHMED mohamed TAHA abdelhamid ALFA 华中农业大学

学位级别：硕士

本论文采用中链甘油三酯(MCT)和长链甘油三酯(LCTs,棕榈,大豆和菜籽油)为乳液油相,研究了高场强超声乳化对含有不同油相的大豆分离蛋白(SPI)稳定乳液理化性质的影响。此外,研究了高场强超声乳化对不同离子强度(0,25,50,100,200,300m M)... 详细信息

本论文采用中链甘油三酯(MCT)和长链甘油三酯(LCTs,棕榈,大豆和菜籽油)为乳液油相,研究了高场强超声乳化对含有不同油相的大豆分离蛋白(SPI)稳定乳液理化性质的影响。此外,研究了高场强超声乳化对不同离子强度(0,25,50,100,200,300m M)条件下的菜籽油-大豆蛋白乳液理化性质的影响。结果表明,在超声乳化18分钟后,MCT乳液的d值达到0.5±0.0μm,液滴尺寸最小。相比于LCT乳液,MCT乳液具有更好的乳液稳定性(中性p H及室温下条件下采用蒸馏水作为水相),界面吸附蛋白量更高,但其ζ-电位值最低。特别的是,棕榈油乳液在90℃热处理30分钟后粒径减小。在中性p H和室温下,低盐浓度(100 m M Na Cl)的SPI稳定乳液在冻融循环后具有更高的稳定性。在超声乳化前向SPI溶液中加入Na Cl,乳液的界面吸附蛋白量显着增加。高场强超声波技术是一种有效的乳化手段,可用于制备大豆分离蛋白稳定乳液。此外,在不同油相种类、离子强度以及超声时间条件下,高场强超声乳化制备的大豆分离蛋白稳定乳液具有不同的物理化学性质。

关键词：高强度超声大豆蛋白中链和长链甘油三酯油(MCT和LCT) 乳液稳定性理化性质离子强度

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介质阻挡放电制备金属催化剂在稠油原位改质中的研究

介质阻挡放电制备金属催化剂在稠油原位改质中的研究

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作者： mohamed Hatem Attia abdelhamid（阿提亚）大连海事大学

学位级别：硕士

稠油储量约为常规石油的十倍,是重要的石油资源。然而,稠油黏度大,胶质、沥青质含量高,使得稠油开采十分困难,不仅开采成本较高,同时造成诸多生态环境污染问题。因此,开发井下稠油原位改质技术逐渐成为研究热点。本文研究过渡金属催化... 详细信息

稠油储量约为常规石油的十倍,是重要的石油资源。然而,稠油黏度大,胶质、沥青质含量高,使得稠油开采十分困难,不仅开采成本较高,同时造成诸多生态环境污染问题。因此,开发井下稠油原位改质技术逐渐成为研究热点。本文研究过渡金属催化剂参与的稠油原位改质技术,利用介质阻挡放电等离子体制备了Ni/γ-AlO、Ni-Cu/γ-AlO两种催化剂。介质阻挡放电等离子体属于低温等离子体,具有较高的电子温度(>1000 K)与较低的气体温度(300～500 K),有利于金属催化剂的高效制备,可有效防止催化剂制备过程中的过度烧结。将制备的催化剂用于稠油改质研究,实现了较低温度下快速降粘。此外,通过稠油族组分分析、产物分析及催化剂表征,讨论了稠油催化改质反应机制,厘清催化反应过程与提高稠油降粘率间的联系,为进一步优化稠油原位催化改质研究做铺垫。本文的主要结论是:1.通过介质阻挡放电制备的催化剂,Ni、Cu可均匀分布在γ-AlO表面,并呈现为纳米颗粒,极大增加了反应位点与催化活性;2.在放电制备Ni催化剂过程中,Cu的添加可有效降低催化反应温度,实现在低温下催化反应,且可有效提高催化剂的稳定性,不易失活;3.稠油催化改质后,重质组分(胶质、沥青质)快速降低,同时轻质组分得到有效提升,同时实现了降粘与改质;4.稠油催化改质的机理主要为通过加氢、部分氧化,及水热反应,实现稠油组分中硫、氮、氧元素的高效脱除,进而实现稠油的改质降粘。

关键词：稠油原位改质过渡金属催化剂低温等离子体

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Transabdominal Pre-Peritoneal Mesh for Inguinal Hernia Repair with External Fixation versus Mesh Stapling

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Surgical Science 2013年第11期4卷 516-519页

作者： mohamed abdelhamid Ahmed mohamed Sadat Ayman Refaat Abdelhaseeb Tamer mohamed Nabil mohamed Salah Abdelbasset Amro mohamed Ali Bechet Hesham Ahmed Nafady Kalid Ahmed Shawky Faculty of Medicine Bani Swif University Bani Swif Egypt

Background: It is unknown whether stapling the mesh affects recurrence rate, incidence of neuralgia, and port-site hernia. We chose to fix it to the exterior reducing port size, cost and pain, at the same comparing this with traditional mesh stapling. Methods: We conducted a prospective trial for laparoscopic TAPP inguinal hernia repair on 120 patients in which we fixed the mesh to the anterior abdominal wall using either two prolene threads that passed to the exterior and tied in place or traditional mesh stapling. Results: The operative time is ranged from 35 to 70 minutes for external fixation, 30 to 60 minutes for mesh stapling, and 4 to 51 months for follow-up, and no recurrence occurred in both groups during the procedure. Two cases with post TAPP pain in mesh stapling patients are discussed with reduction of the cost and port size in external fixation patients. Conclusion: It is not necessary to secure the mesh during laparoscopic TAPP inguinal hernia repair from the interior and it is fixed only to the exterior allowing a reduction in size of the ports and considerable reduction in cost with elimination of TAPP associated post operative pain.

关键词： Laparoscopic Transabdominal Preperitoneal Inguinal Hernia Repair Mesh Prosthesis Fixation Cost-Stapling

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Concordance of HER-2/Neu over Expression with Steroid Receptor Status in Female Breast Cancers

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Surgical Science 2014年第8期5卷 354-362页

作者： mohamed Salah abdelhamid Solafa Amin Abdelaziz Sahar Ali Daoud Ahmed mohamed Sadat Ayman Refaat Abdelhaseeb Tamer mohamed Nabil mohamed Salah Abdelbasset Hesham Ahmed Nafady Khaled Ahmed Shawky mohamed Hasssen Abdelmoola Benisuef Faulty of Medicine Benisuef Egypt Kasr Al Aini Faculty of Medicine Cairo Egypt

HER-2/neu over expression is associated with increased tumor aggressiveness, increased rates of recurrence, and increased mortality in node positive patients. It is amplified and/or over expressed in approximately 30% of female breast cancers. This study was to detect the relation between HER-2/neu over expression and steroid hormone receptor status. It was conducted at Cairo and Bani Suif university hospitals between February 2012 to February 2014. HER-2/neu over expression was found to be positive in thirteen patients (41%) out of the thirty two patients included in the study, more positive (52%) HER-2/neu was found among estrogen receptor (ER) positive patients, on the other hand, only 18% positive HER-2/neu was detected among ER negative patients. This difference was statistically significant (P < 0.03). The same outcome was with progesterone receptors (PR) and HER-2/neu with statistically significant difference also (P = 0.02). Conclusion: HER-2/neu over expression is strongly related to ER and PR, this was more evident in negative steroid receptors status. The failure of treatment in positive steroid receptors could be explained by HER-2/neu positivity.

关键词： HER-2/Neu ER PR

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Classical state feedback controller for nonlinear systems using mean value theorem： closed Ioop-FOC of PMSM motor application

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Frontiers in Energy 2015年第4期9卷 413-425页

作者： Abrar ALLAG abdelhamid BENAKCHA Meriem ALLAG Ismail ZEIN mohamed Yacine AYAD LGEB Laboratory Department of Electrical Engineering University of Biskra Biskra BP 145 Algeria R&D Industrial Hybrid Vehicle Applications Belfort 90010 France

The problem of state feedback controllers for a class of Takagi-Sugeno （T-S） Lipschitz nonlinear systems is investigated. A simple systematic and useful synthesis method is proposed based on the use of the differential mean value theorem （DMVT） and convex theory. The proposed design approach is based on the mean value theorem （MVT） to express the nonlinear error dynamics as a convex combination of known matrices with time varying coefficients as linear parameter varying （LPV） systems. Using the Lyapunov theory, stability conditions are obtained and expressed in terms of linear matrix inequalities （LMIs）. The controller gains are then obtained by solving linear matrix inequalities. The effectiveness of the proposed approach for closed loop-field oriented control （CL-FOC） of permanent magnet synchronous machine （PMSM） drives is demonstrated through an illustrative simulation for the proof of these approaches. Furthermore, an extension for controller design with parameter uncertainties and perturbation performance is discussed.

关键词： Takagi-Sugeno (T-S) fuzzy systems sectornonlinearity nonlinear controller linear matrix inequality(LMI) approach differential mean value theorem (DMVT),field oriented control (FOC) linear parameter varying(LPV)

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Conjunctival flap advancement with or without scleral graft for hypotony maculopathy after trabeculectomy

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International Journal of Ophthalmology(English edition) 2020年第7期13卷 1079-1086页

作者： abdelhamid Shaker Elhofi mohamed Fahmy Doheim Amir AbouSamra Department of Ophthalmology Faculty of MedicineAlexandria UniversityAlexandria 21131Egypt Faculty of Medicine Alexandria UniversityAlexandria 21131Egypt

AIM: To investigate the outcomes of adaptive conjunctival flap advancement surgical techniques with or without scleral graft for patients undergoing revision surgery after ***: This retrospective study included 28 eyes of 28 subjects from December 2015 to April 2018. A group of 15 eyes underwent conjunctival advancement only while the other 13 eyes did conjunctival advancement with partial thickness scleral graft. In both study groups, we considered the intraocular pressure(IOP) as our primary outcome and visual acuity(VA) as our secondary outcome. Both were assessed pre-and post-operatively till the last followup possible point. Additionally, we classified the patients according to complete and qualified success ***: The mean age of the conjunctival advancement group was 36.87±19.25 y, while it was 44.08±18.04 in the other group. In both study groups, the mean IOP significantly increased after revision surgery at 1, 2, 3 mo and the last follow-up visit when compared to prior the surgery(P<0.001). Moreover, VA was significantly improved(P=0.03) in the final follow-up for both surgical techniques. When we compared the change from baseline in both groups, there was no significant difference between IOP improvement in 1 mo(P=0.263), while the difference was significant in 2 mo(P=0.03), 3 mo(P=0.02) and in the final follow-up visit postoperatively. However, this difference was not significant regarding VA(P=0.5).CONCLUSION: The both adaptive techniques of conjunctival advancement and conjunctival advancement with scleral graft are effective for treating patients with lateonset hypotony. Yet, more prospective studies are needed to assert upon these results.

关键词： trabeculectomy scleral melting revision surgery hypotony maculopathy

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Noninvasive assessment of hepatic fibrosis in Egyptian patients with chronic hepatitis C virus infection

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World Journal of Gastroenterology 2012年第23期18卷 2988-2994页

作者： Shawky abdelhamid Fouad Serag Esmat Dalia Omran Laila Rashid mohamed H Kobaisi Department of Internal Medicine Faculty of Medicine Cairo University Cairo 11562 Egypt Department of Tropical Medicine Faculty of Medicine Cairo University Cairo 11562 Egypt Department of Biochemistry Faculty of Medicine Cairo University Cairo 11562 Egypt Department of Pathology National Institute of Nephrology Cairo 35789 Egypt

AIM: To evaluate the accuracy of specific biochemical markers for the assessment of hepatic fibrosis in patients with chronic hepatitis C virus (HCV) infection. METHODS: One hundred and fifty-four patients with chronic HCV infection were included in this study; 124 patients were non-cirrhotic, and 30 were cirrhotic. The following measurements were obtained in all patients: serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), albumin, total bilirubin, prothrombin time and concentration, complete blood count, hepatitis B surface antigen (HBsAg), HCVAb, HCV-RNA by quantitative polymerase chain reaction, abdominal ultrasound and ultrasonic-guided liver biopsy. The following ratios, scores and indices were calculated and compared with the results of the histopathological examination: AST/ALT ratio (AAR), age platelet index (API), AST to platelet ratio index (APRI), cirrhosis discriminating score (CDS), Pohl score, G teborg University Cirrhosis Index (GUCI). RESULTS: AAR, APRI, API and GUCI demonstrated good diagnostic accuracy of liver cirrhosis (80.5%, 79.2%, 76.6% and 80.5%, respectively); P values were: 0.05). In addition, we found significant correlations for the AAR, APRI, API, GUCI and Pohl score between the non-cirrhotic (F0, F1, F2, F3) and cirrhotic (F4) groups (P values: 0.05). CONCLUSION: The use of AAR, APRI, API, GUCI and Pohl score measurements may decrease the need

关键词： Age platelet index Aspartate aminotrans-ferase platelet ratio index Aspartate aminotransferase-to-alanine aminotransferase ratio Cirrhosis discrimi-nating score Fibrosis evaluation G^teborg UniversityCirrhosis Index Hepatitis C virus infection Liver fibro-sis Pohl score

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