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Post-cholecystectomy iatrogenic bile duct injuries:Emerging role for endoscopic management

World Journal of Gastrointestinal Surgery 2023年第12期15卷 2709-2718页

作者： mohamed H Emara Mohammed Hussien ahmed mohamed I Radwan Emad Hassan Emara Magdy Basheer ahmed ali Asem ahmed Elfert Department of Hepatology Gastroenterology and Infectious DiseasesKafrelsheikh UniversityKafr-Elshikh 33516Egypt Department of Tropical Medicine Zagazig UniversityZagazig 44519Egypt Department of Diagnostic and Interventional Radiology Kafrelsheikh UniversityKafr-Elshikh 33516Egypt Department of Surgery Mansoura UniversityMansours 44176Egypt Department of Emergency Hargeisa Group HospitalHargeisa 1235Somalia Department of Tropical Medicine Tanta UniversityTanta 33120Egypt

Post-cholecystectomy iatrogenic bile duct injuries(IBDIs),are not uncommon and although the frequency of IBDIs vary across the literature,the rates following the procedure of laparoscopic cholecystectomy are much higher than open *** injuries caries a great burden on the patients,physicians and the health care systems and sometime are *** are associated with different manifestations that are not limited to abdominal pain,bile leaks from the surgical drains,peritonitis with fever and sometimes *** injuries if not witnessed during the surgery,can be diagnosed by combining clinical manifestations,biochemical tests and imaging *** such techniques abdominal US is usually the first choice while Magnetic Resonance Cholangio-Pancreatography seems the most *** approach was the ideal approach for such cases,however the introduction of Endoscopic Retrograde Cholangio-Pancreatography(ERCP)was a paradigm shift in the management of such injuries due to accepted success rates,lower cost and lower rates of associated morbidity and ***,the literature lacks consensus for the optimal timing of ERCP intervention in the management of *** management of IBDIs can be tailored according to the nature of the underlying *** the subgroup of patients with complete bile duct ligation and lost ductal continuity,transfer to surgery is indicated without *** patients will not benefit from endoscopy and hence should not do unnecessary *** low–flow leaks *** bed leaks,conservative management for 1-2 wk prior to ERCP is advised,in contrary to high-flow leaks *** duct leaks and stricture lesions in whom early ERCP is *** plus stenting is the ideal management line for cases of *** radiologic techniques are promising options especially for cases of failed endoscopic repair and also for cases with altered *** studies will

关键词： Iatrogenic bile duct injuries Cholecystectomy Surgical repair Endoscopic Retrograde Cholangio-Pancreatography Interventional radiology

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A hydromechanical approach for anisotropic elasto-viscoplastic geomaterials:Application to underground excavations in sedimentary rocks

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Underground Space 2019年第2期4卷 109-120页

作者： mohamed Mahjoub ahmed Rouabhi Mines ParisTech PSL Research UniversityCentre de Ge´osciencesFontainebleauFrance

To better describe excavation operations in deep geological formations,several aspects should be considered,especially the material anisotropy,time-dependent behavior,and hydromechanical *** the present paper,a hydromechanical model based on the framework of continuous porous media was *** mechanical elasto-viscoplastic constitutive model accounted for the material elastic and non-elastic anisotropies,using a transformation between the real transversely isotropic material and a fictitious isotropic *** the hydraulic behavior,the permeability was expressed as a function of the volumetric viscoplastic *** model was applied to a case study of two tunnel excavations in an anisotropic rock under an initial anisotropic stress *** results of the numerical simulations using a finite element code were in good agreement with the field convergence and permeability data.

关键词： Hydromechanical behavior Transverse isotropy Tunnel excavation Viscoplasticity Permeability

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Oxidation Properties in CO_2 of Inconel Alloy 600 Coated by Simultaneous Aluminizing-Chromizing Process

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Chinese Journal of Aeronautics 2007年第2期20卷 134-139页

作者： ahmed Moosa Jalil Karim ahmed ali Hoobi The University of Technology Baghdad-Iraq Ministry of Labor and Social Affairs Baghdad-Iraq Ministry of Science and Technology Baghdad-Iraq

IN 600 alloy was coated with two different types of coatings, Cr-modified aluminide coating this is called aluminizing-chromizing and Y-doped chromium modified aluminide coating this is called aluminizing-chromizing-yttriumizing. Diffusion coating was carried at 1 050℃ for 8 h under Ar atmosphere by simultaneous aluminizing-chromizing process and by simultaneous aluminizing-chromizing- yttriumizing. Cyclic oxidation tests were conducted on the uncoated and on the coated Inconel 600 alloy in the temperature range 800- 1 000℃ in CO2 for 100 h at 10 h *** results showed that the oxidation kinetics for uncoated Inconel 600 alloy in CO2 is parabolic and the phases present are NiO, （Fe, Cr）2O3 , NiFe2O4 and NiCrO4. The oxidation kinetics for both coated systems in CO2 was found to be parabolic and the value ofkp for both coated systems were found to be lower than that for uncoated Inconel 600 alloy. Oxide phases that formed on coated systems are Al2O3 and NiCrO4. The role of yttrium can be attributed to its ability to improve the adherence of the oxide scale.

关键词： Inconel oxidation diffusion bonding aluminizing-chromizing Ni-superalloy

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Numerical Analysis of Bacterial Meningitis Stochastic Delayed Epidemic Model through Computational Methods

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 311-329页

作者： Umar Shafique mohamed Mahyoub Al-Shamiri ali Raza Emad Fadhal Muhammad Rafiq Nauman ahmed Department of Mathematics National College of Business Administration and EconomicsLahore54660Pakistan Department of Mathematics Applied CollegeMahayl AssirKing Khalid UniversityAbha62529Saudi Arabia Department of Physical Sciences The University of ChenabGujrat50700Pakistan Department of Mathematics&Statistics College of ScienceKing Faisal UniversityP.O.Box 400Al-Ahsa31982Saudi Arabia Department of Computer Science and Mathematics Lebanese American UniversityBeirut1102-2801Lebanon Department of Mathematics Faculty of Science and TechnologyUniversity of Central PunjabLahore54000Pakistan Department of Mathematics and Statistics University of LahoreLahore54000Pakistan

Based on theWorld Health Organization(WHO),Meningitis is a severe infection of the meninges,the membranes covering the brain and spinal *** is a devastating disease and remains a significant public health *** study investigates a bacterial meningitis model through deterministic and stochastic ***-compartment population dynamics explain the concept,particularly the susceptible population,carrier,infected,and *** model predicts the nonnegative equilibrium points and reproduction number,i.e.,the Meningitis-Free Equilibrium(MFE),and Meningitis-Existing Equilibrium(MEE).For the stochastic version of the existing deterministicmodel,the twomethodologies studied are transition probabilities and non-parametric ***,positivity,boundedness,extinction,and disease persistence are studiedrigorouslywiththe helpofwell-known *** and nonstandard techniques such as EulerMaruyama,stochastic Euler,stochastic Runge Kutta,and stochastic nonstandard finite difference in the sense of delay have been presented for computational analysis of the stochastic ***,standard methods fail to restore the biological properties of the model,so the stochastic nonstandard finite difference approximation is offered as an efficient,low-cost,and independent of time step *** addition,the convergence,local,and global stability around the equilibria of the nonstandard computational method is studied by assuming the perturbation effect is *** simulations and comparison of the methods are presented to support the theoretical results and for the best visualization of results.

关键词： Bacterial Meningitis disease stochastic delayed model stability analysis extinction and persistence computational methods

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Exact and heuristic formulae to compute the geodetic height from the ellipse equation

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Geodesy and Geodynamics 2024年第2期15卷 150-155页

作者： mohamed Eleiche ahmed Hamdi Mansi Construction Department Faculty of EngineeringEgyptian Russian UniversityCairoEgypt Istituto Nazionale di Geofisica e Vulcanologia Sezione di PisaPisaPlItaly

The conversion of the cartesian coordinates of a point to its geodetic equivalent coordinates in reference to the geodetic ellipsoid is one of the main challenges in *** ellipse equation in the meridian plane significantly influences the value of the geodetic *** research analyzes this influence and how it can contribute to their *** study investigates the mathematical relation between them and presents an exact formula relating to the geodetic height and the ellipse *** addition,a heuristic formula for the relation between the geodetic height and the ellipse equation is proposed,which is independent of the geodetic latitude and has a relative accuracy better than 99.9 %.The calculation is stable,and the cost is low.

关键词： Ellipse equation Geodetic height Heuristic geodetic height

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Evaluation of extracts and essential oil from Callistemon viminalis leaves:Antibacterial and antioxidant activities,total phenolic and flavonoid contents

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Asian Pacific Journal of Tropical Medicine 2013年第10期6卷 785-791页

作者： mohamed ZM Salem Hayssam M ali Nader A El-Shanhorey ahmed Abdel-Megeed Forestry and Wood Technology Department Faculty of Agriculture(EL-Shatby)Alexandria University Botany and Microbiology Department College of ScienceKing Saud University Timber Trees Research Department Sabahia Horticulture Research StationHorticulture Research InstituteAgriculture Research Center Department of Botanical Gardens Research Horticultural Research Institute(ARC) Faculty of Agriculture(Saba Basha) Alexandria University

Objective:To investigate antioxidant and antibacterial activities of Callistemon viminalis(***)***:The essential oil of *** leaves obtained by hydrodistillation was analyzed by GC/*** extracts were tested for total phenolic and flavonoid contents and in vitro antioxidant(DPPH assay)and antibacterial(agar disc diffusion and 96-well micro-plates methods)***:Fourteen components were identified in the essential oil,representing 98.94%of the total *** major components were 1,8-cineole(64.53%)andα-pinene(9.69%).Leaf essential oil exhibited the highest antioxidant activity of(88.60±1.51)%comparable to gallic acid,a standard compound[(80.00±2.12)%].Additionally,the biggest zone of inhibitions against the studied bacterial strains was observed by the essential oil when compared to the standard antibiotic(tetracycline).The crude methanol extract and ethyl acetate fraction had a significant antibacterial activity against the tested bacterial ***:It can be suggested that *** is a great potential source of antibacterial and antioxidant compounds useful for new antimicrobial drugs from the natural *** present study revealed that the essential oil as well as the methanol extracts and ethyl acetate fraction of *** leaves exhibited highly significant antibacterial activity against the tested bacterial strains.

关键词： Callistemon viminalis Essential oil Antibacterial activity Antioxidant activity Phenolic content Flavonoid content

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A Note on z-Ideals and z°-Ideals of the Formal Power Series Rings and Polynomial Rings in an Infinite Set of Indeterminates

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Algebra Colloquium 2020年第3期27卷 495-508页

作者： ahmed Maatallah ali Benhissi Faculty of Sciences of Monastir MonastirTunisia

Let A be a *** this paper we generalize some results introduced by aliabad and *** give a relation bet ween the z-ideals of A and t hose of the formal power series rings in an infinite set of indetermiiiates over *** A[[Xa]]3 and its subrings A[[X_(A)]]_(1),A[[X_(A)]]_(2),and A[[X_(A)]]_(α),where a is an infinite cardinal *** fact,a z-ideal of the rings defined above is of the form I+(X_(A))i,where i=1,2,3 or an infinite cardinal number and I is a z-ideal of *** addition,we prove that the same condition given by aliabad and Mohamadian can be used to get a relation between the minimal prime ideals of the ring of the formal power series in an infinite set of indeterminates and those of the ring of *** a natural result,we get a relation between the z°-ideals of the formal power series ring in an infinite set of indeterminates and those of the ring of coefficients.

关键词： z-ideal z°-ideal formal power series ring polynomial ring infinite set of inde terminates

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Efficacy of octreotide in the prevention of complications after pancreaticoduodenectomy in patients with soft pancreas and non-dilated pancreatic duct: A prospective randomized trial

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Hepatobiliary & Pancreatic Diseases International 2018年第1期17卷 59-63页

作者： Ayman El Nakeeb ahmed El Gawalby Mahmoud A.ali ahmed Shehta Hosam Hamed mohamed El Refea ahmed Moneer ahmed Abd El Rafee Gastroenterology Surgical Center Mansoura University

Background: The efficacy of octreotide to prevent postoperative pancreatic fistula(POPF) of pancreaticoduodenectomy(PD) is still controversial. This study aimed to evaluate the effect of postoperative use of octreotide on the outcomes after ***: This is a prospective randomized controlled trial for postoperative use of octreotide in patients undergoing PD. Patients with soft pancreas and pancreatic duct ality(P = 0.727).Conclusions: Octreotide did not reduce postoperative morbidities, reoperation and mortality rate. Also, it did not affect the incidence of POPF and its clinically relevant variants.

关键词： Pancreaticoduodenectomy Postoperative pancreatic fistula Octreotide Periampullary tumor

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Machine learning-based seismic assessment of framed structures with soil-structure interaction

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Frontiers of Structural and Civil Engineering 2023年第2期17卷 205-223页

作者： mohamed NOURELDIN Tabish ali Jinkoo KIM Department of Global Smart City Sungkyunkwan UniversitySuwon 16419Korea

The objective of the current study is to propose an expert system framework based on a supervised machine learning technique(MLT)to predict the seismic performance of low-to mid-rise frame structures considering soil-structure interaction(SSI).The methodology of the framework is based on examining different MLTs to obtain the highest possible accuracy for *** the MLT,a sensitivity analysis was conducted on the main SSI parameters to select the most effective input *** limit state criteria were used for the seismic evaluation within the process.A new global seismic assessment ratio was introduced that considers both serviceability and strength aspects by utilizing three different engineering demand parameters(EDPs).The proposed framework is novel because it enables the designer to seismically assess the structure,while simultaneously considering different EDPs and multiple limit ***,the framework provides recommendations for building component design based on the newly introduced global seismic assessment ratio,which considers different levels of seismic *** proposed framework was validated through comparison using non-linear time history(NLTH)*** results show that the proposed framework provides more accurate results than conventional ***,the generalization potential of the proposed framework was tested by investigating two different types of structural irregularities,namely,stiffness and mass *** results from the framework were in good agreement with the NLTH analysis results for the selected case studies,and peak ground acceleration(PGA)was found to be the most influential input parameter in the assessment process for the case study models *** proposed framework shows high generalization potential for low-to mid-rise structures.

关键词： seismic hazard artificial neural network soil-structure interaction seismic analysis

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SYNTHESIS,CHARACTERIZATION AND ENHANCED ELECTRICAL PROPERTIES OF CTAB-DIRECTED POLYANILINE NANOPARTICLES

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Chinese Journal of Polymer Science 2011年第2期29卷 181-190页

作者： Lal Said Jan mohamed ahmed Siddig Department of Physics Postgraduate College Mardan23200Khyber PakhtunkhwaPakistan School of Physics and Applied Physics Faculty of Science and TechnologyEL Neelain UniversityKhartoumSudan

Inverse microemulsion system of cetyltrimethylammonium bromide（CTAB） molecules is utilized for virtually monodispersed and controlled growth of HCl polyaniline（PANI） nanoparticles at room temperature（ca.300 K）.The templated electroconductive polymer reveals lamellar crystalline structure under X-ray diffraction signifying marked sub-chain alignment of the polymerized *** nanostructured polymer has spherically symmetric morphology in a size range of 2.0 nm to 6.0 nm under electron microscope *** permeation chromatography gives polydispersity index of 1.02 for nanostructured polymer in agreement with the size monodispersity transpired by electron *** *** conductivityσ_（dc） of PANI at room temperature is 10.11 S/cm whereas the variation of conductivity with temperature in the range 227-303 *** that the conducting mechanism can be considered as three-dimensional variable-range-hopping（3D-VRH）.UV-Vis spectrum indicates two broad absorption bands due to polaron formation that contributes to enhanced electrical conductivity of the *** fundamental absorption edge in the polymer is formed by direct allowed transitions to the extent that the optical band gap value was found to be 2.35 *** crystalline nanostructure and homogeneous doping attained in the cationic template of amphiphile are argued as contributing factors to the enhanced conductivity of the polymer.

关键词： Polyaniline Nanostructured Band gap energy Electrical conductivity

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