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Journal of Surface Engineered Materials and Advanced Technology 2015年第3期5卷 136-146页

作者： Juan Rodrigo Laguna-Camacho hermilo martínez-garcía Frumencio Escamilla-Rodríguez Carlos Alarcón-Rosas Celia María Calderón-Ramón Lizeth Ríos-Velasco Lizeth Ríos-Velasco Matilde Pelcastre-Lozano álvaro Casados-Sánchez Melesio González-Gómez Faculty of Electrical and Mechanical Engineering Universidad Veracruzana Veracruz Mexico Facultad de Ciencias Químicas Universidad Veracruzana Poza Rica de Hidalgo Veracruz Mexico

In this work, erosion tests were performed to study the behavior of an aluminium alloy known as AISI 6061-T6 against the impact action of aluminium oxide abrasive particles. This material was selected because of its high ductility and tenacity. An erosion rig based on that in ASTM G76-95 was used to conduct the tests. The alumina particles had a particle size between 300 and 400 μm. Four incident angles, 30°, 45°, 60° and 90° were used to conduct the erosion tests. The particle velocity and the abrasive flow rate were 24 ± 2 m/s and 63 ± 0.5 g/min. The room temperature was between 35°C and 40°C. Chemical analysis of the material and abrasive particles were obtained using energy dispersive X-ray analysis (EDS). SEM images were employed to identify the wear mechanisms, which were characterized by high plastic deformation. The erosion rates were obtained and the results indicated that the maximum erosion damage was achieved at 30° reducing progressively at normal incidence.

关键词： Erosion AISI 6061-T6 Aluminium Oxide Wear Mechanisms

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Letter to the Editor concerning:Gallbladder perforation:A single-center experience in north India and a step-up approach for management

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Hepatobiliary & Pancreatic Diseases International 2022年第6期21卷 617-618页

作者： hermilo Jeptef Angeles-Mar Mariano garcia-Camp RodrigoEnrique Elizondo-Omaña Santos Guzmán-López Javier Humberto martinez-Garza Alejandro Quiroga-Garza Universidad Autonoma de Nuevo Leon School of MedicineHuman Anatomy DepartmentMonterreyNuevo León CP 64460México Universidad Autonoma de Nuevo Leon School of MedicinePlataforma INVEST-KER Unito Mayo Clinic(KER Unit Mexico)MonterreyNuevo LeónMéxico General Surgery Division Instituto Mexicano del Seguro SocialMonterreyNuevo LeónMéxico

To the Editor:We sincerely applaud the work done by Gupta et al.,in which they analyzed a single-center experience regarding gallbladder per-foration(GBP)management[1].Currently,there is a lack of cohort studies to adequately describe the approach strategies and man-agement for this pathology,with international guidelines making ambiguous recommendations[2,3].Their study stratified GBP types and provided details regarding clinical presentation,comorbidities,preoperative diagnosis,etiology,imaging techniques,and surgical *** study reported a high conversion rate when a la-paroscopic approach was attempted for cholecystectomy.

关键词： diagnosis concerning approach

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Gallbladder perforation with fistulous communication

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World Journal of Gastrointestinal Surgery 2023年第6期15卷 1191-1201页

作者： Alejandro Quiroga-Garza Neri Alejandro Alvarez-Villalobos Milton Alberto Muñoz-Leija Mariano garcia-Campa hermilo Jeptef Angeles-Mar Guillermo Jacobo-Baca Rodrigo Enrique Elizondo-Omana Santos Guzman-Lopez Human Anatomy Department Universidad Autonoma de Nuevo LeonSchool of MedicineMonterrey 64460Nuevo LeonMexico General Surgery Division Hospital de Traumatología y Ortopedia No.21Instituto Mexicano del Seguro SocialMonterrey 64000Nuevo LeonMexico Plataforma INVEST Medicina UANLKER Unit Mayo Clinic Universidad Autonoma de Nuevo LeonSchool of MedicineMonterrey 64460Nuevo LeonMexico Family Medicine Division Instituto Mexicano del Seguro SocialMonterrey 64000Nuevo LeonMexico Surgery Division Hospital General de Zona No.6Instituto Mexicano del Seguro SocialMonterrey 64000Nuevo LeonMexico

BACKGROUND The management of gallbladder perforation(GBP)with fistulous communication(Neimeier type I)is *** To recommend management options for GBP with fistulous *** A systematic review of studies describing the management of Neimeier type I GBP was performed according to the PRISMA *** search strategy was conducted in Scopus,Web of Science,MEDLINE,and EMBASE(May 2022).Data extraction was obtained for patient characteristics,type of intervention,days of hospitalization(DoH),complications,and site of fistulous *** A total of 54 patients(61%female)from case reports,series,and cohorts were *** most frequent fistulous communication occurred in the abdominal *** from case reports/series had a similar proportion of complications between open cholecystectomy(OC)and laparoscopic cholecystectomy(LC)(28.6 vs 12.5;P=0.569).Mortality was higher in OC(14.3 vs 0.0;P=0.467)but this proportion was given by only one *** were higher in OC(mean 26.3 d vs 6.6 d).There was no clear association between higher rates of complications of a given intervention in cohorts,and no mortality was *** Surgeons must evaluate the advantages and disadvantages of the therapeutic *** and LC are adequate options for the surgical management of GBP,with no significant differences.

关键词： Gallbladder perforation Open cholecystectomy Laparoscopic cholecystectomy Fistulous communication

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Linking Numerical Water Quality Models in an Environmental Information System for Integrated Environmental Assessments

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Journal of Environmental Protection 2013年第7期4卷 126-137页

作者： Franklin Torres-Bejarano hermilo Ramirez Ralf Denzer Steven Frysinger Thorsten Hell Sascha Schlobinski Cismet GmbH Saarbrücken Germany. Department of Postgraduates Studies Mexican Petroleum Institute Mexico City Mexico Environmental Informatics Group (EIG) Saarbrücken Germany Environmental Informatics Group (EIG) Saarbrücken Germany 3Cismet GmbH Saarbrücken Germany.

Decision makers involved in prevention of water contamination often lack the technical knowledge of water quality evaluation or the comprehension of complex software for environmental information management required to make effective decisions. Providing information about the environment is not an easy task due to its complex structure, relationships, and dynamic processes. Because environmental models play an important role in environmental decision support systems, the integration of models into user-friendly integrated information systems is a key factor in the support of such users. This paper presents an environmental information system which supports water protection of Coatzacoalcos River in Mexico, having as a main building block water quality assessments supported by mathematical modeling through the two-dimensional Saint Venant and Advection-Diffusion-Reaction equations to calculate the river hydrodynamics and the contaminant transport, respectively. The mathematical modeling solution yields appropriate results representing the river contaminant distribution when compared with field measurements. But the direct use of these models by decision makers is difficult at best, meaning they are not likely to be used in making practical decisions. The system described in this paper integrates these models, and several other tools, into a seamless, user-centered application, improving model usability, initial configuration, and results visualization.

关键词： Environmental Information Systems Environmental Decision Support Systems Water Quality Modeling Integrated Modeling

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