oalib

OALib Journal期刊

ISSN: 2333-9721

费用:600人民币/ 99美元

投稿

时间不限

4 ( 1 )

2017 ( 146 )

2016 ( 731 )

2015 ( 13172 )

自定义范围…

匹配条件: “Carlos René Gómez Pérez” ,找到相关结果约418224条。
列表显示的所有文章,均可免费获取
第1页/共418224条
每页显示
Origin Parameters of Fused Flux Grain Process Dispersion with Air Parámetros de origen del proceso de dispersión con aire de fundentes fundidos
Daniel Pérez Pérez,Carlos René Gómez Pérez,Francisco Arturo Ruiz Martínez,Eriel Pérez Zapico
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i1.39
Abstract: Considerations about the fragmentation process with air of molten fluxes obtained by using raw Cuban materials for the welding process under submerged arch (S.A.W) are presented. The physical process of the flight trajectory and its validation during the granulation with air are not reported in the welding field. Therefore, the aim of this work is to establish a procedure that determines the rates and departure angles of pellets during impulsion and dispersion, in addition to contribute criteria on the frictional effect of the surrounding atmosphere on the shape of the trajectory curve of the pellets formed. These aspects may be corroborated with data obtained from the digital processing of filmed images of the fragmentation process and movement of the pellets formed. It is demonstrated that the efficiency of the procedure developed for the obtaining of the flight parameters and the non-influence of the air frictional force on the modification of the particle’s flight trajectory, allows the establishment of a methodology that makes it possible to begin studies about the fragmentation phenomena of molten fluxes by using air jets, which guarantee the necessary rank and granulometric types for an adequate performance of the welding process. Se plantean consideraciones sobre el proceso de fragmentación con aire de fundentes fundidos, obtenidos utilizando materias primas cubanas, para el proceso de soldadura bajo arco sumergido (SAW). El proceso físico de la trayectoria de vuelo y su validación durante la granulación con aire no se reportan en el campo de la soldadura. El objetivo de este trabajo es establecer un procedimiento para determinar las velocidades y ángulos de salida de los peles durante su impulsión y dispersión, además de aportar criterios del efecto friccional de la atmósfera circundante sobre la forma de la curva de trayectoria de los peles formados. Estos aspectos se pueden corroborar con los datos obtenidos mediante el procesamiento digital de las imágenes filmadas del proceso de fragmentación y desplazamiento de los peles formados. Se demuestran la eficacia del procedimiento desarrollado para la obtención de los parámetros de vuelo y la no influencia de la fuerza friccional del aire sobre la modificación de la trayectoria de vuelo de las partículas, permitiendo establecer una metodología, que posibilita iniciar estudios sobre los fenómenos de fragmentación de fundentes fundidos empleando chorros de aire, que garanticen los rangos y clases granulométricas necesarias para un adecuado desempe o del proceso de soldadura.
An Overview on the Installation of Obtaining Aluminum Powder Instalación experimental para la obtención de polvos de aluminio
Lázaro Suárez Lisca,Carlos René Gómez Pérez,Lázaro Pino Rivero
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i2.50
Abstract: This paper discusses the instrumentation required for obtaining metallic powder by combining the thermal and mechanical impact between the liquid and other fluid. A brief review of existing methods for the production of aluminum powder is made, and then a calculation methodology for the design and dimensioning of an atomization tower is elaborated, which will be used to obtain the diameter of particles ranging from 100 to 300 micrometer in an argon atmosphere of a discontinuous process. In the designed atomization tower the liquid metal is broken up by the action of a flow of pressurized gas supplied from a blower to spray nozzles, and then the liquid metal enters the granulation chamber impelled by a piston. The total cost of the installation is determined and the general aspects on how to operate and maintain the facility expounded. El trabajo aborda el tema de la instrumentación necesaria para la obtención de polvos metálicos mediante la combinación del choque térmico y el impacto mecánico entre el líquido y otro fluido. Se hace una breve valoración sobre los métodos existentes para la obtención de polvos de aluminio, se elabora una metodología de cálculo para el dise o y dimensionamiento de una torre de atomización, la cual será utilizada para obtener diámetros de partículas desde 100 hasta 300 μm, en una atmósfera de argón, en un proceso discontinuo y para fines experimentales. En la torre de atomización dise ada el metal líquido es fragmentado por la acción de un flujo de gas a presión suministrado desde un soplador hasta las boquillas de atomización; el metal líquido entra a la cámara de granulación impulsado por un pistón. Se determina el costo total de la instalación y se exponen los aspectos generales sobre la operación y mantenimiento de la instalación.
Study of Fragmentation Process of Fused Fluxes Using Air Estudio del proceso de fragmentación de fundentes fundidos usando aire
Daniel Pérez Pérez,Carlos René Gómez Pérez,Francisco Arturo Ruiz Martínez,Jorge Víctor Miguel Oria
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i2.47
Abstract: In the paper the fragmentation process with air of fused fluxes is studied by means of a particular treatment of the interaction process between the air and flux fluids starting from physical and mathematical considerations of the collision phenomenon which are the result of the application of Newton's mechanics-classical theory. In the paper is schematized the impact and change of trajectory process of the incandescent fused flux flow because of the air mechanical action provided by a blowpipe and the equations referred to the interaction between the fluids are set. As a result, the equations for estimating the exit angle and the average velocities of the pellets formed are determined whenever the interacting air and flux fluxes are known as well as the incidence angles. From the theory developed the essential parameters of the granulation process with air of fused fluxes, by considering the average diameter of the particles to be obtained for their industrial performance can be estimated. En el trabajo se estudia el proceso de fragmentación con aire de fundentes fundidos, a través de un tratamiento particular del proceso de interacción entre los fluidos de aire y de fundente, a partir de las consideraciones físicas y matemáticas del fenómeno de los choques que son resultado de la aplicación de la teoría mecano-clásica de Newton. Se esquematiza el proceso de impacto y cambio de trayectoria del chorro de fundente fundido incandescente por la acción mecánica del aire, suministrada por un soplador, y se plantean las ecuaciones referentes a la interacción entre los fluidos. Como resultado se determinan las ecuaciones para estimar el ángulo de salida y las velocidades promedio de los peles formados, si se conocen los flujos de fundente y de aire interactuantes, así como los ángulos de incidencia. A partir de la teoría desarrollada pueden estimarse los parámetros esenciales del proceso de granulación con aire de fundentes fundidos, considerando el diámetro medio de partículas a obtener para su ejecución industrial.
Comportamiento del tiempo de duración, la frecuencia de los cortocircuitos y la conductividad eléctrica durante el reencendido del arco en la soldadura SMAW (AC) con electrodos E6013
García Rodríguez, Alejandro;Gómez Pérez, Carlos René;Rivera Borroto, Oscar Miguel;Miguel Oria, Jorge Víctor;
Soldagem & Inspe??o , 2009, DOI: 10.1590/S0104-92242009000100008
Abstract: the objective of this work is the valuation of the behavior of short-circuits frequency and duration time and electrical conductivity on arc reigniting in smaw (shielded metal arc welding) process with alternate current and e6013 electrodes. the non parametric statistic analysis realize a robust data processing, minimizing the outliers influence and mistakes derivates about employ of approximations to well know continues distributions. the median and the median absolute deviation (mad) respect to median of the data are the localization and dispersion estimators used, respectively. the electrode at 160 a present a better stability on metal transference supported on the most little value of mad for the period of transference (39,36 ms), and the mad of the short-circuit duration (1,43 ms), according with the presence of a major electric conductivity during the arc reigniting (1766,17x10-3 s?s-1).
Valoración del desempe?o de un dispositivo de autoalimentación dise?ado para la evaluación operativa de electrodos revestidos
García Rodríguez, Alejandro;Gómez Pérez, Carlos René;Miguel Oria, Jorge Víctor;Rivera Borroto, Oscar Miguel;Sánchez Roca, Angel;
Soldagem & Inspe??o , 2009, DOI: 10.1590/S0104-92242009000100007
Abstract: the objective of the present work is to evaluate the effectiveness of a self-feed device for covered electrodes. this device is able of eliminate disturbances from manual operation or the use of automatic control systems during the study of covered electrode behavior. the conjugation of different methods like short-circuit time statistical analysis, metallographic analysis (penetration, heat affected zone, shape and mean distance between successive solidification fronts) together with the analysis of the electric arc and electrode melting parameters allow us to obtain relationships between arc behavior, mass transfer processes and bead appearance. this permits the extraction of criteria to describe process stability and the behavior of the feed device employed. an appropriate statistical methodology was obtained to process the parameter "duration of short-circuit" through an appropriate adjustment of empirical distributions to a lognormal model. the self-feed device for covered electrode welding allows the repeatable and reproducible execution of welding beads in the flat position, keeping the arc length based on physical and chemistry characteristics of the electrode during welding trials using 125a, 140a, and 160a.
PERFILES ASOCIADOS AL CONSUMO DE ALCOHOL DE ADOLESCENTES ESCOLARIZADOS MEDIANTE ANáLISIS DE CORRESPONDENCIAS MúLTIPLES
SCOPPETTA,ORLANDO; PéREZ GóMEZ,AUGUSTO; LANZIANO MOLANO,CARLOS;
Acta Colombiana de Psicología , 2011,
Abstract: a survey was applied to 9.276 male and female students in nine cities of colombia. it was aimed at studying issues such as the prevalence of consumption, age of onset, type and quantity of alcohol ingested, sites and ease of acquisition, presence of adults, consumption at school and attitudes toward legal restrictions, among others. also, an analysis of multiple correspondence was carried out which grouped the students around three categories of alcohol consumption: low, intermediate and high. the analysis produced identifiable profiles, quite different for the three categories: in the 'low consumption' group were the youngest, who don't drink strong beverages, do not attend parties where alcohol is offered to minors and never have drunk at school or during several days; the 'intermediate' group gathered those around 16 years of age, who drink whatever is offered to them, stop drinking when feeling 'high', attend parties where alcohol is offered to minors and accept legal restrictions as something positive; in the 'high consumption' group are those over 16 years of age, who generally get drunk when they drink, have taken alcohol while in school and before arriving there in the morning, have been in trouble because of alcohol and reject legal restrictions on minors.
Salud y escenarios urbanos: Estudio de género
Pi?ón Gámez,Aimeé; Barceló Pérez,Carlos;
Revista Cubana de Medicina General Integral , 2005,
Abstract: literature states that the environment influence on the health of the individuals living there. different urban settings according to road engineering profiles, elements of the social situation and pathological history may influence on the health status. the annoyance caused y the environment reflected in the perception of noise and the stress perceived by the housewives living in neighborhoods selected in havana city were an objective to be cleared up in order to know the relation among these settings, health and the well-being of these housewives. the method applied consisted in a combined cross-sectional descriptive and analytical study conducted in a sample of housewives aged 20-40, who do not work at present and live in the blocks selected as characteristic settings. a questionnaire of generalities, the perceived stress test (pss) and the abbreviated health status test (sf-26) were used. the results show that the health status and the annoyance were linked to the urban setting of the neighborhood, but not the perceived stress. the self-perceived stress level and the health status were not critical in general. it was considered that noise affected health, although the annoyance was not intense. music, phonation and traffic were identified as the most relevant sources of noise.
Situación ambiental y su relación con afecciones a la salud
Pi?ón Gámez,Aimeé; Barceló Pérez,Carlos;
Revista Cubana de Medicina General Integral , 2005,
Abstract: this bibliographic review includes some elements of the environmental health situation in the city that may exert a negative influence on the wellbeing of its citizens, starting from the progressive increase in the degree of urbanization and the subsequent deterioration suffered by the urban settings in the developing countries.
PERFILES ASOCIADOS AL CONSUMO DE ALCOHOL DE ADOLESCENTES ESCOLARIZADOS MEDIANTE ANáLISIS DE CORRESPONDENCIAS MúLTIPLES
Scoppetta, Orlando,Pérez Gómez, Augusto,Lanziano Molano, Carlos
Acta Colombiana de Psicología , 2011,
Abstract: A survey was applied to 9.276 male and female students in nine cities of Colombia. It was aimed at studying issues such as the prevalence of consumption, age of onset, type and quantity of alcohol ingested, sites and ease of acquisition, presence of adults, consumption at school and attitudes toward legal restrictions, among others. Also, an analysis of multiple correspondence was carried out which grouped the students around three categories of alcohol consumption: low, intermediate and high. The analysis produced identifiable profiles, quite different for the three categories: in the 'low consumption' group were the youngest, who don't drink strong beverages, do not attend parties where alcohol is offered to minors and never have drunk at school or during several days; the 'intermediate' group gathered those around 16 years of age, who drink whatever is offered to them, stop drinking when feeling 'high', attend parties where alcohol is offered to minors and accept legal restrictions as something positive; in the 'high consumption' group are those over 16 years of age, who generally get drunk when they drink, have taken alcohol while in school and before arriving there in the morning, have been in trouble because of alcohol and reject legal restrictions on minors.
Salud y escenarios urbanos: Estudio de género Health and urban settings: A gender study
Aimeé Pi?ón Gámez,Carlos Barceló Pérez
Revista Cubana de Medicina General Integral , 2005,
Abstract: La literatura plantea que los entornos influyen sobre la salud de los individuos que allí habitan. Distintos escenarios urbanos según perfiles ingeniero viales, elementos de la situación social y antecedentes patológicos, podrían influir en el estado de salud. La molestia por el ambiente reflejada en la percepción de ruido, y la tensión percibida por amas de casa residentes en vecindades seleccionadas de Ciudad de La Habana, constituyeron un objetivo a esclarecer para conocer las relaciones entre estos escenarios, la salud y el bienestar de las amas de casa que allí viven. El método aplicado consistió en un estudio transversal combinado, con un componente descriptivo y otro analítico, en una muestra de amas de casa, con edad entre 20 y 40 a os, sin vínculos laborales actuales y residentes en las cuadras seleccionadas como escenarios característicos, utilizando un cuestionario de generalidades, el test de tensión percibida (PSS) y el test abreviado de estado de salud (SF-36). Los resultados muestran que el estado de salud y la molestia se vincularon al escenario urbano de la vecindad de residencia, no así a la tensión percibida. El nivel de tensión y el estado de salud autopercibido no fue en general crítico. El ruido se declaró como que afecta la salud, pero la molestia no era intensa, y se identificaron como fuentes más relevantes la música y la fonación, seguidas del tráfico. Literature states that the environment influence on the health of the individuals living there. Different urban settings according to road engineering profiles, elements of the social situation and pathological history may influence on the health status. The annoyance caused y the environment reflected in the perception of noise and the stress perceived by the housewives living in neighborhoods selected in Havana City were an objective to be cleared up in order to know the relation among these settings, health and the well-being of these housewives. The method applied consisted in a combined cross-sectional descriptive and analytical study conducted in a sample of housewives aged 20-40, who do not work at present and live in the blocks selected as characteristic settings. A questionnaire of generalities, the perceived stress test (PSS) and the abbreviated health status test (SF-26) were used. The results show that the health status and the annoyance were linked to the urban setting of the neighborhood, but not the perceived stress. The self-perceived stress level and the health status were not critical in general. It was considered that noise affected health, although the annoyan
第1页/共418224条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.