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

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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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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Thermomechanical Characterization of a Bio-Sourced Material Based on Clay and Alfa Fibers

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1853-1863页

作者： Sara Ibn-Elhaj Yassine Elhamdouni Soumia Mounir abdelhamid Khabbazi EMDD_CERNE2D Mohammed V University in RabatHigher School of Technology SaléSalé11060Morocco National School of Architecture Agadir New Complex Ibn ZohrAgadir80000Morocco

Bio-based materials are of great interest owing to their abundance and the immense potential they display as an ideal alternative to widely used industrial construction materials(that directly and indirectly harm the environment).In this scope,an in-depth experimental study is presented here on clay-based materials aimed to enhance their properties through the addition of other bio-based components such as fibers,in the present case alfa *** thermal conductivity and mechanical properties(compressive and flexural tensile strengths)of the composite clay-alfa material are analyzed with the percentage of alfa fiber in the matrix ranging from 0%to 4%.It is concluded that a percentage of alfa fibers between 1%and 2%is the most effective to get the required optimization of thermal and mechanical behavior of this bio-based material.

关键词： Hot plate method in a steady-state regime clay composite mechanical alfa fiber

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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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Finite Difference Method for Equation （2＋1）-Kuramoto-Sivashinsky Equation

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Journal of Partial Differential Equations 2018年第3期31卷 193-213页

作者： BEZIa.abdelhamid MABROUK Anouar Ben Algebra and Number Theory Laboratory Faculty of Mathematics University of Sciences and Technology Houari Boumediene BP 32 EL-Alia 16111 Bab Ezzouar Algiers Algeria. Dpartement de Mathématiques Institut Supérieur de Mathématiques Appliqées et Informatique de Kairouan Avenue Assad Ibn Al-Fourat Kairouan 3100 Tunisia. Laboratory of Algebra Number Theory and Nonlinear Analysis. Department of Mathematics Faculty of Sciences University of Monastir 5000 Monastir Tunisia. Department of Mathematics College of Sciences Tabuk University Saudi Arabia Kingdom.

This paper investigates a solution technique for solving a two-dimensional Kuramoto-Sivashinsky equation discretized using a finite difference method. It consists of an order reduction method into a coupled system of second-order equations, and to formulate the fully discretized, implicit time-marched system as a Lyapunov- Sylvester matrix equation. Convergence and stability is examined using Lyapunov criterion and manipulating generalized Lyapunov-Sylvester operators. Some numerical implementations are provided at the end to validate the theoretical results.

关键词： Kuramoto-Sivashinsky equation Finite difference method Lyapunov-Sylvester operators

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Disorders of potassium homeostasis after kidney transplantation

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World Journal of Transplantation 2024年第3期14卷 40-51页

作者： abdelhamid Aboghanem G V Ramesh Prasad School of Medicine University of TorontoToronto M5C 2T2OntarioCanada Kidney Transplant Program St.Michael's HospitalToronto M5C 2T2OntarioCanada

Disturbances of potassium balance are often encountered when managing kidney transplant recipients(KTR).Both hyperkalemia and hypokalemia may present either as medical emergencies or chronic outpatient *** the high incidence of hyperkalemia and its potential life-threatening implications,consensus on its management in KTR is *** in KTR is also well-described,although it is given less attention by clinicians compared to *** article discusses the etiology,pathophysiology and management of both types of potassium disorders in *** any emergent situation has been corrected,treatment approaches include correcting insulin deficiency if present,adjusting non-immunosuppressive and immunosuppressive medications,elimi-nating or supplementing potassium as needed,and dietary *** commonly of multifactorial etiology,ascertaining the specific cause in a particular patient will help guide successful *** KTR through regular laboratory testing is essential to detect serious disturbances in potassium balance since patients are often asymptomatic.

关键词： Balance Dialysis Hyperkalemia Hypokalemia Kidney Metabolism Potassium

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A hydrochemical study of the Hammam Righa geothermal waters in north-central Algeria

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Acta Geochimica 2016年第3期35卷 271-287页

作者： Mohamed Belhai Yasuhiro Fujimitsu Fatima Zohra Bouchareb-Haouchine abdelhamid Haouchine Jun Nishijima Department of Earth Resources Engineering GraduateSchool of EngineeringKyushu UniversityFukuoka 819-0395Japan Department of Earth Resources Engineering Faculty ofEngineeringKyushu UniversityFukuoka 819-0395Japan Laboratoire de Geo-Environnement FSTGAT/USTHB BP 32El-Alia16000 AlgiersAlgeria

This study focuses on the hydrochemical characteristics of 47 water samples collected from thermal and cold springs that emerge from the Hammam Righa geothermal field, located in north-central Algeria. The aquifer that feeds these springs is mainly situated in the deeply fractured Jurassic limestone and dolomite of the Zaccar Mount. Measured discharge temperatures of the cold waters range from 16.0 to 26.5 ℃ and the hot waters from 32.1 to 68.2 ℃. All waters exhibited a near-neutral pH of 6.0-7.6. The thermal waters had a high total dis- solved solids （TDS） content of up to 2527 mg/l, while the TDS for cold waters was 659.0-852.0 mg/l. Chemical analyses suggest that two main types of water exist： hot waters in the upflow area of the Ca-Na-SO4 type （Ham- mam Righa） and cold waters in the recharge zone of the Ca-Na-HCO3 type （Zaccar Mount）. Reservoir tempera- tures were estimated using silica geothermometers and fluid/mineral equilibria at 78, 92, and 95℃ for HR4, HR2, and HRI, respectively. Stable isotopic analyses of the δ18O and δD composition of the waters suggest that the thermal waters of Hammam Righa are of meteoric origin. We conclude that meteoric recharge infiltrates through the fractured dolomitic limestones of the Zaccar Mount and is conductively heated at a depth of 2.1-2.2 km. The hotwaters then interact at depth with Triassic evaporites located in the hydrothermal conduit （fault）, giving rise to the Ca-Na-SO4 water type. As they ascend to the surface, the thermal waters mix with shallower Mg-rich ground- water, resulting in waters that plot in the immature water field in the Na-K-Mg diagram. The mixing trend between cold groundwaters from the recharge zone area （Zaccar Mount） and hot waters in the upflow area （Hammam Righa） is apparent via a chloride-enthalpy diagram that shows a mixing ratio of 22.6 〈 R 〈 29.2 %. We summa- rize these results with a geothermal conceptual model of the Hammam Righa geothermal field.

关键词： Thermal waters North-central Algeria Geochemistry Geothermometry Geothermal conceptualmodel Cold groundwaters

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Performance Analysis of a Solar Continuous Adsorption Refrigeration System

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Fluid Dynamics & Materials Processing 2023年第4期19卷 1067-1081页

作者： Kolthoum Missaoui Nader Frikha.abdelhamid Kheiri Slimane Gabsi Mohammed El Ganaoui Lorraine University NancyFrance Gabes University GabesTunisia Sfax University SfaxTunisia Lorraine University LongwyFrance

A study is conducted on the performances of a solar powered continuous-adsorption refrigerator considering two particular days as references cases,namely,the summer solstice(June 21st)and the autumn equinox(September 21st).The cooling capacity,system performance coefficient and the daily rate of available cooling energy are *** main goal is to compare the performances of a solar adsorption chiller equipped with a hot water tank(HWT)with an equivalent system relying on solar collectors with no heat storage *** daily cooling rates for the solar refrigerator are found to be 102.4 kWh and 74.3 kWh,respectively,on June 21st and on September 21st,using a total collector’s area of 43.47 *** corresponding values for the adsorption chiller equipped with a hot water tank of 2 m3(and using a total collector’s area of 72.45 m2),are 127.1 kWh and 106.13 kWh,respectively.

关键词： Solar continuous adsorption refrigerator dynamic energetic study system performance hot water tank CPC collector thorough system variable heat source

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Ranking Evaluation and Aging Assessment of Pump Stations at Fayoum City，Egypt

Ranking Evaluation and Aging Assessment of Pump Stations at ...

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作者： Sultan Adel abdelhamid Kotb 扬州大学

学位级别：硕士

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Enhancing Parkinson’s Disease Prediction Using Machine Learning and Feature Selection Methods

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Computers, Materials & Continua 2022年第6期71卷 5639-5657页

作者： Faisal Saeed Mohammad Al-Sarem Muhannad Al-Mohaimeed abdelhamid Emara Wadii Boulila Mohammed Alasli Fahad Ghabban College of Computer Science and Engineering Taibah UniversityMedina41477Saudi Arabia School of Computing and Digital Technology Birmingham City UniversityBirminghamB47XGUnited Kingdom Information System Department Saba’a Region UniversityMareebYemen Computers and Systems Engineering Department Al-Azhar UniversityCairo11884Egypt RIADI Laboratory National School of Computer SciencesUniversity of ManoubaManouba2010Tunisia

Several millions of people suffer from Parkinson’s disease ***’s affects about 1%of people over 60 and its symptoms increase with *** voice may be affected and patients experience abnormalities in speech that might not be noticed by listeners,but which could be analyzed using recorded speech *** the huge advancements of technology,the medical data has increased dramatically,and therefore,there is a need to apply data mining and machine learning methods to extract new knowledge from this *** classification methods were used to analyze medical data sets and diagnostic problems,such as Parkinson’s Disease(PD).In addition,to improve the performance of classification,feature selection methods have been extensively used in many *** paper aims to propose a comprehensive approach to enhance the prediction of PD using several machine learning methods with different feature selection methods such as filter-based and *** dataset includes 240 recodes with 46 acoustic features extracted from3 voice recording replications for 80 *** experimental results showed improvements when wrapper-based features selection method was used with K-NN classifier with accuracy of 88.33%.The best obtained results were compared with other studies and it was found that this study provides comparable and superior results.

关键词： Filter-based feature selection methods machine learning parkinson’s disease wrapper-based feature selection methods

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