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How does epidemiological and clinicopathological features affect survival after gastrectomy for gastric cancer patientssingle Egyptian center experience

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World Journal of Gastrointestinal Surgery 2016年第6期8卷 444-451页

作者： Ehab El Hanafy Ayman El Nakeeb Helmy Ezzat Emad Hamdy Ehab Atif Tharwat Kandil Amgad Fouad mohamed abdel wahab Ahmed Monier Gastroenterology Surgical Center Mansoura University

AIM:To investigate the clinicopathological features and the significance of different prognostic factors which predict surgical overall survival in patients with gastric ***:This retrospective study includes 80 patients diagnosed and treated at gastroenterology surgical center,Mansoura University,Egypt between February 2009 to February *** factors were assessed by cox proportional hazard ***:There were 57 male and 23 *** median age was 57 years(24-83).One,3 and 5 years survival rates were 71%,69% and 46% *** median survival was 69.96 *** the follow-up period,13 patients died(16%).Hospital morbidity was reported in 10 patients(12.5%).The median number of lymph nodes removed was 22(4-41).Lymph node(LN) involvement was found in 91% of *** R0 resection,depth of wall invasion,LN involvement and the number(> 15) of retrieved LN,LN ratio and tumor differentiation predict *** multivariable analysis,tumor differentiation,curability of resection and a number of resected LN superior to 15 were found to beindependent prognostic ***:Surgery remains the cornerstone of *** differentiation,curability of resection and a number of resected LN superior to 15 were found to be independent prognostic *** LN dissection does not increase the morbidity or mortality rate but markedly improves long term survival.

关键词： Cancer stomach Prognostic factors Lymph node metastasis Recurrence after gastrectomy Lymph node ratio

Families of Sordariomycetes

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Fungal Diversity 2016年第4期79卷 1-317页

作者： Sajeewa S.N.Maharachchikumbura Kevin D.Hyde E.B.Gareth Jones E.H.C.McKenzie Jayarama D.Bhat Monika C.Dayarathne Shi-Ke Huang Chada Norphanphoun Indunil C.Senanayake Rekhani H.Perera Qiu-Ju Shang Yuanpin Xiao Melvina J.D’souza Sinang Hongsanan Ruvishika S.Jayawardena Dinushani A.Daranagama Sirinapa Konta Ishani D.Goonasekara Wen-Ying Zhuang Rajesh Jeewon Alan J.L.Phillips mohamed A.abdel-wahab Abdullah M.Al-Sadi Ali H.Bahkali Saranyaphat Boonmee Nattawut Boonyuen Ratchadawan Cheewangkoon Asha J.Dissanayake Jichuan Kang Qi-Rui Li Jian Kui Liu Xing Zhong Liu Zuo-Yi Liu JJennifer Luangsa-ard Ka-Lai Pang Rungtiwa Phookamsak Itthayakorn Promputtha Satinee Suetrong Marc Stadler Tingchi Wen Nalin N.Wijayawardene Guizhou Key Laboratory of Agricultural Biotechnology Guizhou Academy of Agricultural SciencesGuiyang 550006GuizhouChina Center of Excellence in Fungal Research and School of ScienceMae Fah Luang UniversityChiang Rai 57100Thailand Department of Crop Sciences College of Agricultural and Marine SciencesSultan Qaboos UniversityP.O.Box 34Al-Khod 123Oman Department of Botany and Microbiology College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Kingdom of Saudi Arabia Manaaki Whenua Landcare Research Private Bag 92170AucklandNew Zealand No.128/1-J Azad Housing SocietyCurcaP.O.Goa Velha403108 GoaIndia Department of Botany Goa UniversityGoa 403206India Engineering Research Center of Southwest Bio-Pharmaceutical Resources Ministry of EducationGuizhou UniversityGuiyang 550025Guizhou ProvinceChina Institute of Plant and Environment Protection Beijing Academy of Agriculture and Forestry SciencesNo 9 of ShuGuangHuaYuanZhangLuHaidian District Beijing 100097China State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Department of Health Sciences Faculty of ScienceUniversity of MauritiusReduitMauritius Faculty of Sciences Biosystems and Integrative Sciences Institute(BioISI)University of LisbonCampo Grande1749-016 LisbonPortugal Department of Botany Faculty of ScienceSohag UniversitySohagEgypt Fungal Biodiversity Laboratory BIOTECNational Science and Technology Development Agency(NSTDA)113 Thailand Science ParkThanon PhahonyothinTombon Khlong NuengAmphoe Khlong LuangPathum Thani 12120Thailand Department of Plant Pathology Faculty of AgricultureChiang Mai UniversityChiang Mai 50200Thailand Department of Pharmacy Guiyang Medical UniversityGuiyangGuizhou 550025China Microbe Interaction Laboratory BIOTECNational Science and Technology Development Agency(NSTDA)113 Thailand Science ParkThanon PhahonyothinTombon Khlong NuengAmphoe Khlong LuangPathum Thani 12120Thailand Institute of Marine Biology and Center of Excell

Sordariomycetes is one of the largest classes of Ascomycota that comprises a highly diverse range of fungi characterized mainly by perithecial ascomata and inoperculate unitunicate *** class includes many important plant pathogens,as well as endophytes,saprobes,epiphytes,coprophilous and fungicolous,lichenized or lichenicolous *** occur in terrestrial,freshwater and marine habitats *** paper reviews the 107 families of the class Sordariomycetes and provides a modified backbone tree based on phylogenetic analysis of four combined loci,with a maximum five representative taxa from each family,where *** paper brings together for the first time,since Barrs’1990 Prodromus,descriptions,notes on the history,and plates or illustrations of type or representative taxa of each family,a list of accepted genera,including asexual genera and a key to these taxa of *** of taxa is supported where possible by molecular *** outline is based on literature to the end of 2015 and the Sordariomycetes now comprises six subclasses,32 orders,105 families and 1331 *** family Obryzaceae and Pleurotremataceae are excluded from the class.

关键词： Amplistromatales Annulatascales Boliniales Calosphaeriales Chaetosphaeriales Coniochaetales Conioscyphales Cordanales Coronophorales Diaporthales Falcocladiales Glomerellales Hypocreales Jobellisiales Koralionastetales Lulworthiales Magnaporthales Melanosporales Meliolales Microascales Ophiostomatales Phylogeny Phyllachorales Pisorisporiales Pleurotheciales Sordariales Savoryellales Tirisporellales Togniniales Torpedosporales Trichosphaeriales Taxonomy Trichosphaeriales Type species Xylariales

Multi-Scale Analysis of Fretting Fatigue in Heterogeneous Materials Using Computational Homogenization

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Computers, Materials & Continua 2020年第1期62卷 79-97页

作者： Dimitra Papagianni Magd abdel wahab Department of Materials Science and Engineering University of IoanninaIoanninaGreece Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903Zwijnaarde B-9052Belgium Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

This paper deals with modeling of the phenomenon of fretting fatigue in heterogeneous materials using the multi-scale computational homogenization technique and finite element analysis(FEA).The heterogeneous material for the specimens consists of a single hole model(25% void/cell,16% void/cell and 10% void/cell)and a four-hole model(25%void/cell).Using a representative volume element(RVE),we try to produce the equivalent homogenized properties and work on a homogeneous specimen for the study of fretting ***,the fretting fatigue contact problem is performed for 3 new cases of models that consist of a homogeneous and a heterogeneous part(single hole cell)in the contact *** aim is to analyze the normal and shear stresses of these models and compare them with the results of the corresponding heterogeneous models based on the Direct Numerical Simulation(DNS)***,by comparing the computational time and%deviations,we draw conclusions about the reliability and effectiveness of the proposed method.

关键词： Fretting fatigue multi-scale analysis computational homogenization heterogeneous materials stress analysis finite element analysis

A Review on Fretting Wear Mechanisms,Models and Numerical Analyses

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Computers, Materials & Continua 2019年第5期59卷 405-432页

作者： Tongyan Yue Magd abdel wahab State Grid Xinyuan Maintenance Branch BeijingChina Department of Electrical Energy MetalsMechanical Constructions&SystemsSoete LaboratoryFaculty of Engineering and ArchitectureGhent UniversityGhentBelgium Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

Fretting wear is a material damage in contact surfaces due to micro relative displacement between *** causes some general problems in industrial applications,such as loosening of fasteners or sticking in components supposed to move relative to each *** wear is a complicated problem involving material properties of tribosystem and working conditions of *** to these various factors,researchers have studied the process of fretting wear by experiments and numerical modelling *** paper reviews recent literature on the numerical modelling method of fretting *** a briefly introduction on the mechanism of fretting wear,numerical models,which are critical issues for fretting wear modelling,are *** paper is concluded by highlighting possible research topics for future work.

关键词： Fretting wear wear models wear mechanisms numerical modelling

Novel CYP1B1 mutations and a possible prognostic use for surgical management of congenital glaucoma

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International Journal of Ophthalmology(English edition) 2019年第4期12卷 607-614页

作者： mohamed M.Khafagy Nadia El-Guendy Marwa A Tantawy mohamed A.Eldaly Hala M.Elhilali abdel Hady A.abdel wahab Ophthalmology Department Faculty of Medicine Cairo University Cancer Biology Department National Cancer Institute Cairo University Research Department Children's Cancer Hospital

AIM: To identify CYP1B1 gene mutations and evaluate their possible role as a prognostic factor for success rates in the surgical management of Egyptian congenital glaucoma ***: Totally 42 eyes of 29 primary congenital glaucoma patients were operated on with combined trabeculotomy/trabeculectomy with mitomycin-C and followed up at 1 d, 1 wk, 1, 6 and 12 mo postoperatively. Genomic DNA was extracted from peripheral blood leukocytes. Coding regions of CYP1B1 gene were amplified using 13 pairs of primers, screened for mutations using single-strand conformation polymorphism followed by sequencing of both strands. Efficacy of the operation was graded as either a success [maintaining intraocular pressure(IOP) less than 21 mm Hg with or without antiglaucoma medication], or a failure(IOP more than 21 mm Hg with topical antiglaucoma medications). RESULTS: Seven novel mutations out of a total of 15 different mutations were found in the CYP1B1 genes of 14 patients(48.2%). The presence of CYP1B1 gene mutations did not correlate with the failure of the surgery(P=0.156, odds ratio=3.611, 95%CI, 0.56 to 22.89); while the positive consanguinity strongly correlated with failure of the initial procedure(P=0.016, odds ratio=11.25, 95%CI, 1.57 to 80.30). However, the Kaplan-Meier survival analysis revealed a significantly lower time of IOP control in the subgroup with mutations in CYP1B1 versus the congenital primary glaucoma group without mutations(log rank test, P=0.015).CONCLUSION: Seven new CYP1B1 mutations are identified in Egyptian patients. Patients harboring confirmed mutations suffered from early failure of the initial surgery. CYP1B1 mutations could be considered as a prognostic factor for surgery in primary congenital glaucoma.

关键词： CYP1B1 mutations primary congenital glaucoma intraocular pressure trabeculotomy/trabeculectomy with mitomycin-C.

Effect of wear debris on fretting fatigue crack initiation

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Friction 2022年第6期10卷 927-943页

作者： Shengjie WANG Tongyan YUE Dagang WANG Magd abdel wahab Soete Laboratory Department of Electrical EnergyMetalsMechanical Construction&SystemsFaculty of Engineering and ArchitectureGhent UniversityGhent 9052Belgium State Grid Xinyuan Maintenance Branch Beijing 100000China School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Faculty of Engineering Van Lang UniversityHo Chi Minh City 700000Vietnam Soete Laboratory Ghent UniversityGhent 9052Belgium

Both wear and fatigue occur in fretting condition,and they interact with one another during the whole *** fatigue is commonly analysed without considering the effect of wear in partial slip regime,although wear affects the lifetime of crack *** paper investigates,for the first time,the effect of wear debris on fretting fatigue crack *** investigate the effect of debris,first fretting wear characteristics in partial slip regime are analysed for loading ***,the effect of wear on fretting fatigue crack initiation is investigated using Ruiz parameters and critical plane methods without considering the debris *** the results,we can see that loading conditions affect the wear profiles in different ***,wear has a significant effect on the fatigue in partial slip regime without considering debris especially on the crack initiation ***,considering wear debris in the analysis,its effect on critical plane parameters is *** is found that by considering the wear debris effect,the frtting fatigue crack initiation location is shifted towards the trailing *** predictions of both crack initiation location and lifetime show a good agreement with the experimental data.

关键词： fretting wear fretting fatigue critical plane Ruiz parameter debris

Fatigue crack propagation across grain boundary of Al-Cu-Mg bicrystal based on crystal plasticity XFEM and cohesive zone model

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Journal of Materials Science & Technology 2022年第31期126卷 275-287页

作者： Qi Zhao Magd abdel wahab Yong Ling Zhiyi Liu School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China Faculty of Mechanical-Electrical and Computer Engineering School of Engineering and TechnologyVan Lang UniversityHo Chi Minh CityVietnam Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903B-9052 ZwijnaardeBelgium School of Materials Science and Engineering Central South UniversityChangsha 410083China

In this paper,a methodology integrating crystal plasticity(CP),the eXtended finite element method(XFEM)and the cohesive zone model(CZM)is developed for an Al-Cu-Mg alloy to predict fatigue crack propagation(FCP)across grain boundary(GB)of Al-Cu-Mg alloy during stageІІ.One GB model is incor-porated into FCP constitutive law to describe grain interaction at GB.A bicrystal containing GB is built up to simulate FCP behavior through L participated *** features including GB characteristic,cumulative plastic strain(CPS)distribution and crystal slipping evidence can be *** numer-ical results are compared with published experimental data to check the accuracy of *** work demonstrates that the combination of CP containing GB constitutive laws,XFEM and CZM is a promising methodology in predicting twist angle-controlled crack deflection through GBs.

关键词： Grain boundary Twist angle Crystal plasticity Extended finite element method Fatigue crack propagation Cumulative plastic strain

Multiscale Analysis of the Effect of Debris on Fretting Wear Process Using a Semi-Concurrent Method

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Computers, Materials & Continua 2020年第1期62卷 17-35页

作者： Shengjie Wang Tongyan Yue Magd abdel wahab Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903Zwijnaarde B-9052Belgium State Grid Xinyuan Maintenance Branch BeijingChina Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

Fretting wear is a phenomenon,in which wear happens between two oscillatory moving contact surfaces in microscale *** this paper,the effect of debris between pad and specimen is analyzed by using a semi-concurrent multiscale ***,the macroscale fretting wear model is ***,the part with the wear profile is imported from the macroscale model to a microscale model after running in ***,an effective pad’s radius is extracted by analyzing the contact pressure in order to take into account the effect of the ***,the effective radius is up-scaled from the microscale model to the macroscale model,which is used after running in *** this way,the effect of debris is considered by changing the radius of the pad in the macroscale *** to the smaller number of elements in the microscale model compared with the macroscale model containing the debris layer,the semi-concurrent method proposed in this paper is more computationally ***,the results of this semi-concurrent method show a better agreement with experimental data,compared to the results of the model ignoring the effect of debris.

关键词： Fretting wear debris multiscale analysis semi-concurrent

Improvement of Flat Surfaces Quality of Aluminum Alloy 6061-O By A Proposed Trajectory of Ball Burnishing Tool

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Computers, Materials & Continua 2019年第8期61卷 555-568页

作者： Ruba Alghazoul Almohanad Makki Magd abdel wahab Faculty of Mechanical and Electrical Engineering Al Baath UniversityHomsSyria Institute of Research and Development Duy Tan University03 Quang TrungDa NangVietnam Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityGentBelgium

Burnishing is a profitable process of surface finishing due to its ability to be automated,which makes burnishing method more desirable than other finishing *** obtain high surface finish,non-stop operation is required for CNC machine and we can attain that by choosing a suitable trajectory of the finishing *** other words,burnishing paths should be multidirectional rather than monotonic,in order to cover uniformly the ***,the burnishing force is also a key parameter of the burnishing process because it determines the degree of plastic deformation,and that makes determining the optimum burnishing force an essential step of the burnishing process a ***,we consider the strategy of ball burnishing path and the burnishing force as variable parameters in this *** this paper,we propose a new strategy of burnishing tool path with trochoid cycles that achieves a multidirectional burnishing of the surface according to various *** into consideration the optimum burnishing force,to improve flat surface finish of AL6061-O samples by reducing the surface roughness parameter(Rz).Experiments carried out on 3-axis milling machine show that the proposed trochoidal path is more effective than the conventional one.

关键词： Ball burnishing surface quality trajectories roughness