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3D finite element modelling of multilateral junction wellbore stability

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Petroleum Science 2018年第4期15卷 801-814页

作者： Assef Mohamad-hussein Juliane Heiland Schlumberger Geomechanics Center of ExcellenceBuckingham Gate

Wellbore failure can occur at different stages of operations. For example, wellbore collapse might happen during drilling and/or during production. The drilling process results in the removal of an already stressed rock material. If the induced stresses near the wellbore exceed the strength of rock, wellbore failure occurs. The production process also changes the effective stresses around the wellbore. Such changes in stresses can be significant for high drawdown pressures and can trigger wellbore failure. In this paper, the Mohr–Coulomb failure criterion with a hyperbolic hardening is used. The model parameters are identified from triaxial compression tests. The numerical simulations of laboratory tests showed that the model can reproduce the mechanical behaviour of sandstone. In addition, the simulations of multilateral junction stability experiments showed that the model was able to reproduce yielding and failure at the multilateral junction for different levels of applied stresses. Finally, a numerical example examining multilateral junction stability in an open borehole during drilling and production is presented. The results illustrate the development of a localized failure zone proximate to the area where two wellbore tracks join, particularly on the side with a sharp approaching angle, which would significantly increase the risk of wellbore collapse at the junction.

关键词： Multilateral junction Numerical modelling Stability

Use of liquid biopsies in gastrointestinal cancers

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World Journal of Gastrointestinal Oncology 2021年第9期13卷 1210-1212页

作者： hussein H Khachfe Department of Gastrointestinal Surgical Oncology University of PittsburghPittsburghPA 15232United States

The use of liquid biopsies is a relatively new tool in diagnosis and management of gastrointestinal cancers and is actively being *** biopsies have become extremely popular in cholangiocarcinoma and pancreatic cancer *** more prospective trials using this tool for early diagnosis,liquid biopsies may become an important part of cancer management.

关键词： Liquid biopsy Gastrointestinal cancer Cholangiocarcinoma Pancreatic cancer

Impact of rotavirus vaccine implementation on Israeli children:a comparison between pre-and post-vaccination era

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World Journal of Pediatrics 2022年第6期18卷 417-425页

作者： hussein Zaitoon Shaden Hanna Ellen Bamberger Department of Pediatrics Bnai Zion Medical CenterThe Ruth and Bruce Rappaport Faculty of MedicineTechnion-Israel Institute of Technology47 Golomb St.31048HaifaIsrael The Ruth and Bruce Rappaport Faculty of Medicine Technion-Israel Institute of TechnologyHaifaIsrael

Background Worldwide rotavirus vaccination has resulted in a substantial decrease in rotavirus-induced severe gastroenteritis and related hospitalizations among ***,the characterization of patients warranting hospitalization needs to be further *** purpose of the study is to compare the clinical and laboratory features of children hospitalized with acute rotavirus infection before and after the introduction of routine *** This is a retrospective observational *** were pediatric patients who presented to the Bnai Zion Medical Center pediatric emergency department and were diagnosed with rotavirus acute gastroenteritis between 2017 and *** During the pre-vaccination period(2007–2009),114 infants and young children(median age:14 months,range:1–72 months;59 male,55 female)were hospitalized for rotavirus-induced acute gastroenteritis with a rate of 11.71 positive rotavirus tests per 1000 emergency room *** the post-vaccination period(2012–2019),168 infants and young children(median age:17 months,range:0–84 months;90 male,78 female)were hospitalized with a rate of 4.18 positive rotavirus tests per 1000 emergency room *** were no statistical differences between the two groups in gender,breast-feeding rates and sibling(s).The proportion of cases with moderate-to-severe dehydration was higher in the post-vaccination children than in the pre-vaccination *** Rates of rotavirus-attributed acute gastroenteritis hospitalizations declined from the pre-to the post-vaccination *** rates of dehydration were found in the post-vaccination *** surveillance is warranted to better understand the implications of the vaccine.

关键词： Acute gastroenteritis Booster dose Hospitalization Rotavirus Vaccination

Synthesis, Characterization and Corrosion Inhibitive Properties of New Thiazole Based Polyamides Containing Diarylidenecyclohexanone Moiety

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Chinese Journal of Polymer Science 2015年第1期33卷 1-13页

作者： K.I.Aly M.A.hussein Polymer Chemistry Lab. 122 Chemistry Department Faculty of Science Assiut University Assiut 71516 Egypt Chemistry Department Faculty of Science King Abdulaziz UniversityJeddah 21589 Kingdom of Saudi Arabia

The present work aimed to synthesize a new interesting series of thiazole based polyamides containing diarylidenecyclohexanone moiety 5a-5f using low temperature solution polycondensation technique. The new polymers were synthesized by the reaction of thiazole based monomer namely, bis（2-aminothiazol-4-ylbenzylidene）cyclohexanone 3 with different aliphatic and aromatic diacid chlorides using NMP, and in the presence of anhydrous Li Cl as catalyst. Adipoyl, sebacoyl, oxaloyl, terephthaloyl, isophthaloyl dichlorides and biphenyl dicarbonyl dichloride were used as diacid chlorides. The structure of the model compound 4 as well as the new polymers was confirmed by correct elemental and spectral analyses. The thermal properties of those polymers were evaluated by TGA and DTG measurements and correlated to their structural units, beside X-ray diffraction analysis, solubility and viscometry measurements. The inherent viscosities for the synthesized polymers were in the range 0.6–1.03 d L/g. On the other hand the corrosion inhibitive properties of monomer 3 as well as polyamides 5d and 5f as selected examples were carried out on carbon-steel in 0.5 mol/L H2SO4 at 40 °C. The calculated inhibition efficiency（IE%） for polymer 5d was in the range（82 ± 6）% in all selected concentrations. The best value of IE% was obtained at 1 mg/L to reach 98.24% for polymer 5d and at 0.5 mg/L to reach 87.75% for polymer 5f.

关键词： Diarylidenecyclohexanone Polyamides Synthesis Characterization Thiazole Corrosion inhibitive properties.

Rapid conversion of cellulose to 5-hydroxymethylfurfural using single and combined metal chloride catalysts in ionic liquid

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燃料化学学报 2013年第2期41卷 214-222页

作者： hussein Abou-Yousef El Barbary Hassan Philip Steele Department of Forest Products Mississippi State University Cellulose & Paper Department National Research CenterDokkiCairoEgypt

Direct conversion of cellulose into 5-hydroxymethylfurfural(HMF) was performed by using single or combined metal chloride catalysts in 1-ethyl-3-methylimidazolium chloride(Cl) ionic *** study demonstrated formation of 2-furyl hydroxymethyl ketone(FHMK),and furfural(FF) simultaneously with the formation of *** reaction parameters were addressed to optimize yields of furan derivatives produced from cellulose by varying reaction temperature,time,and the type of metal chloride *** reaction by using FeCl3 resulted in 59.9% total yield of furan derivatives(HMF,FHMK,and FF) from ***3 was the most effective catalyst for selective conversion of cellulose into HMF(35.6%) with less concentrations of FHMK,and *** the yields of furans produced from cellulose could be achieved via reactions catalyzed by different combinations of two metal *** optimization was carried out to produce total furans yield 75.9% by using FeCl3/CuCl2 ***3/CuCl2 was the most selective combination to convert cellulose into HMF(39.9%) with total yield(63.8%) of furans produced from the *** temperature and time of the catalytic reaction played an important role in cellulose conversion,and the yields of *** the reaction temperature could enhance the cellulose conversion and HMF yield for short reaction time intervals(5~20 min).

关键词：化学动力学燃料化学理论 EMIM HMF

Proteomic profiling reveals engineered chitosan nanoparticles mediated cellular crosstalk and immunomodulation for therapeutic application in apical periodontitis

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Bioactive Materials 2022年第5期7卷 77-89页

作者： Hebatullah hussein Anil Kishen The Kishen Lab Dental Research InstituteUniversity of TorontoTorontoON M5G 1G6Canada Faculty of Dentistry University of TorontoTorontoON M5G 1G6Canada Faculty of Dentistry Ain Shams UniversityEndodontics DepartmentCairoEgypt School of Graduate Studies University of TorontoTorontoON M5G 1G6Canada Department of Dentistry Mount Sinai Health SystemMount Sinai HospitalTorontoON M5G 1X5Canada

Macrophages(MQ)are major constituents of chronically inflamed periapical tissues in apical *** study aimed to investigate the immunomodulatory effect of engineered bioactive chitosan-based nanoparticles(CSnp)antibiofilm medication on MQ cocultured with periodontal ligament fibroblasts(PdLF).Cells viability,spreading,PdLF migration,and intracellular CSnp uptake were *** Mass Tag-based proteomics was applied to analyze MQ global protein expression profiles after interaction with Enterococcus faecalis biofilm,CSnp-treated biofilm,and *** inflammatory mediators were *** bioinformatics analyses,candidate proteins were validated via targeted *** maintained cells viability,increased MQ spreading,and PdLF migration(p1.5-folds,p1.5-folds,p<0.05)was ***-treated biofilm reduced pro-inflammatory IL-1β and nitric oxide but enhanced anti-inflammatory IL-10 and TGF-β1(p<0.05).Internalized engineered bioactive CSnp reprogrammed MQ proteomic and cytokine profiles to modulate biofilm-mediated inflammation,and prompted PdLF migration,emphasizing its potential to regulate healing process in the treatment of apical periodontitis.

关键词： Chitosan-based nanoparticles Macrophages Immunomodulation Tandem mass tags Mass spectrometry Endodontics

Doppler ultrasonography in living donor liver transplantation recipients: Intra- and post-operative vascular complications

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World Journal of Gastroenterology 2016年第27期22卷 6145-6172页

作者： Omar Abdelaziz hussein Attia Department of Diagnostic and Interventional Radiology Cairo University Hospitals Department of Diagnostic and Interventional Radiology National Cancer Institute Cairo University

Living-donor liver transplantation has provided a solution to the severe lack of cadaver grafts for the replacement of liver afflicted with end-stage cirrhosis, fulminant disease, or inborn errors of metabolism. Vascular complications remain the most serious complications and a common cause for graft failure after hepatic transplantation. Doppler ultrasound remains the primary radiological imaging modality for the diagnosis of such complications. This article presents a brief review of intra- and post-operative living donor liver transplantation anatomy and a synopsis of the role of ultrasonography and color Doppler in evaluating the graft vascular haemodynamics both during surgery and post-operatively in accurately defining the early vascular complications. Intra-operative ultrasonography of the liver graft provides the surgeon with useful real-time diagnostic and staging information that may result in an alteration in the planned surgical approach and corrections of surgical complications during the procedure of vascular anastomoses. The relevant intraoperative anatomy and the spectrum of normal and abnormal findings are described. Ultrasonography and color Doppler also provides the clinicians and surgeons early post-operative potential developmental complications that may occur during hospital stay. Early detection and thus early problem solving can make the difference between graft survival and failure.

关键词： Doppler Ultrasound Living donor Liver transplantation Intraoperative Postoperative Vascular Complications

Second Order Three-point Boundary Value Problems in Abstract Spaces

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 1131-1152页

作者： Mieczyslaw Cichoń hussein A.H.Salem Faculty of Mathematics and Computer Science Adam Mickiewicz University Department of Mathematics Faculty of SciencesAlexandria University

In this paper we investigate the existence of solutions of the nonhomogeneous three-point boundaryvalue problem We search for solutions of the above problem in the Banach space of continuous functions C（[O, 1], E） with the Pettis integrability assumptions imposed on $. Some classes of Pettis-integrable functions are described in the paper and exploited in the proofs of main results. We stress on a class of pseudo-solutions of considered problem. Our results extend previous results of the same type for both Bochner and Pettis integrability settings. Similar results are also proved for differential inclusions i.e. when f is a multivalued function.

关键词： boundary value problem Pettis integral

Securing Copyright Using 3D Objects Blind Watermarking Scheme

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Computers, Materials & Continua 2022年第9期72卷 5969-5983页

作者： hussein Abulkasim Mona Jamjoom Safia Abbas Faculty of Science New Valley UniversityEl-Kharga 72511Egypt Department of Computer Sciences College of Computer and Information SciencePrincess Nourah Bint Abdulrahman UniversityRiyadh 11671Saudi Arabia

Recently,securing Copyright has become a hot research topic due to rapidly advancing information *** a host cover,watermarking methods are used to conceal or embed sensitive information messages in such a manner that it was undetectable to a human observer in contemporary *** media covers may often take any form,including audio,video,photos,even DNA data *** this work,we present a new methodology for watermarking to hide secret data into 3-D *** technique of blind extraction based on reversing the steps of the data embedding process is *** implemented technique uses the features of the 3-D object vertex’discrete cosine transform to embed a grayscale image with high *** coefficient of vertex and the encrypted picture pixels are used in the watermarking ***,the extraction approach is fully blind and is dependent on the backward steps of the encoding procedure to get the hidden *** distance,Euclidean distance,Manhattan distance,and the Cosine distance are used to evaluate and test the performance of the proposed *** visibility and imperceptibility of the proposed method are assessed to show the efficiency of our work compared to previous corresponding methods.

关键词： Discrete cosine transform 3-D object copyright watermarking