A5012052885- Microstructure and mechanical properties
- Adhesion, Friction, and Surface Interactions
- Tribology and Lubrication Engineering
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Geological and Tectonic Studies in Latin America
- Metal Alloys Wear and Properties
- Gear and Bearing Dynamics Analysis
- Advanced Mathematical Theories and Applications
- Metal Forming Simulation Techniques
- Advanced Mathematical Theories
- Mechanical stress and fatigue analysis
- Cardiac Health and Mental Health
- Geophysics and Gravity Measurements
- Porphyrin and Phthalocyanine Chemistry
- Neurotransmitter Receptor Influence on Behavior
- Spectral Theory in Mathematical Physics
- Reservoir Engineering and Simulation Methods
- Advanced Chemical Physics Studies
- Metallurgy and Material Forming
- Luminescence and Fluorescent Materials
- Advanced Physical and Chemical Molecular Interactions
- Environmental and Ecological Studies
- Cardiac Valve Diseases and Treatments
- Organic Light-Emitting Diodes Research
Universidad Nacional Autónoma de México
2014-2024
Ghent University
2016-2022
Albany Medical Center Hospital
2020-2021
Universidad de Sonora
2008-2019
Materials Science & Engineering
2016
Instituto Politécnico Nacional
2013
Instituto Geográfico Nacional
2008-2012
University of El Salvador
2010
Garrahan Hospital
2007
Polytechnic José Antonio Echeverría
2002-2005
New GPS measurements in Chiapas (Mexico), Guatemala and El Salvador are used to constrain the fault kinematics North America (NA), Caribbean (CA) Cocos (CO) plates triple junction area. The regional velocity field is first analysed terms of strain partitioning across major volcano-tectonic structures, using elastic half-space modelling, then inverted through a block model. We show dominant role Motagua Fault with respect Polochic accommodation present-day deformation associated NA CA...
The simulation and characterisation of randomly rough surfaces is an important topic in surface science, tribology, geo- planetary sciences, image analysis optics. Extensions to general random processes with two continuous variables are straightforward. Several generation algorithms available, preference for one or another method often depends on the specific scientific field. same holds methods estimate fractal dimension D. This work analyses six determination D as a function size domain,...
The objective was to determine the effectiveness of a psychological intervention program for management anxiety and depression patients with potentially lethal cardiac arrhythmia portable pacemaker. 11 from Cardiology General Hospital Mexico were evaluated. Cognitive behavioral conducted once week six weeks, depression. results showed 45.5% in that reduced 9.1% after treatment, similar situation decreased compared initial evaluation 81.8%. different factors Health Related Quality Life also...
When ductile alloys are subject to sliding wear, small increments of plastic strain accumulate into severe deformation and mechanical alloying the surface layer. The authors constructed a simple coaxial tribometer, which was used study this phenomenon in wrought Al-Sn cast Cu-Mg-Sn alloys. first class materials is consists two immiscible phases. Tribological modification observed form transition zone from virgin material severely deformed grains. At surface, mixing both phases competes with...
This work studies the ultrafine subsurface layer produced in Al-Sn and Cu alloys contact with AISI9840 steel. The tribological tests were conducted at room temperature without lubrication a coaxial tribometer. A first microstructural characterization was performed using conventional scanning electron microscopy (SEM) atomic force (AFM). Grain refinement mapping by means of Electron Backscattering Diffraction (EBSD). wear process, during which tribolayers are formed, leads to significant...
Severe plastic deformation (SPD) has led to the discovery of ever stronger materials, either by bulk modification or surface under sliding contact. These processes increase strength an alloy through transformation substructure into submicrometric grains twins. Here, SPD was induced frictional contact with a spherical tool in hot rolled CuAlBe-shape memory alloy. This created microstructure consisting few course martensite variants and ultrafine intersecting bands secondary and/or austenite,...
Stress induced martensitic transformation in copper-based shape memory alloys has been studied mainly monocrystals. This limits the use of such results for practical applications as most engineering polycristals. In present work, a coaxial tribometer developed by authors was used to characterise tribological behaviour polycrystalline Cu-11.5%Al-0.5%Be alloy contact with AISI 9840 steel under sliding wear conditions. The surface and microstructure characterization worn material conducted...
The use of immunohistochemistry to quantify neural markers in various brain regions is a staple neuroscience research. Numerous programs exist automate quantification, but manual assignment interest (ROIs) within individual sections remains time consuming and can introduce interobserver variability. We have developed novel open source FIJI-based immunohistochemical data analysis pipeline, Atlas-Based Analysis (ABA). ABA uses landmark-based image warping adjust the experimental closely align...
Abstract Data in both humans and preclinical animal models clearly indicate drug exposure during adolescence, when the “reward” circuitry of brain develops, increases risk substance use other mental health disorders later life. Human data that different neural behavioral sequelae can be observed early versus late adolescence. However, most studies with rodent examine a single adolescent age compared to mature adult age, often only males. Herein, we sought determine whether acute response...
Objetivo. Validar la adaptacion al espanol del cuestionario de cardiomiopatia Kansas City para medir calidad vida relacionada con salud en pacientes mexicanos hospitalizados insuficiencia cardiaca. Metodo. Participaron 203 Servicio Cardiologia Hospital General Mexico diagnosticados Se adapto el salud; se utilizo clasificacion funcional verificar sensibilidad instrumento respecto a severidad los sintomas Resultados. obtuvo una consistencia interna parecida version original cada uno dominios:...
ResumenEl presente artículo pretende desarrollar soluciones alternativas a dos diferentes problemas que contienen la razón áurea: 1) en un circuito eléctrico con infinitas resistencias óhmicas se presenta una solución inductiva mediante secuencia de Fibonacci y corrobora además el resultado usando fracciones continuas; 2) formulación newtoniana para diseño cono truncado mínima resistencia aerodinámica propone numérica probar bondad del modelo.Ambos ejercicios tienen poder didáctico...
This paper presents the results of three-dimensional finite difference numerical models developed to evaluate behaviour materials constituting track support, considering single and double configurations.The parameters strength deformability sub-ballast, subgrade, embankment layers were varied in models.Findings indicate that double-track configuration is most unfavourable for analysed scenarios.The minimum average safety factors obtained sub-ballast subgrade are relatively low, implying an...
Over the last decades, it has been established that rough surfaces of technological materials can be described by means random processes with fractal character.This numerical simulation contact mechanics will depend on size simulated surface or lower cut-of distance (i.e.mesh size) simulation; moreover, each only presents a single case out an infinite spectrum possible results.This work explores problem statistical convergence focusing characteristics which are relevant for applications,...