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Thermomechanical Performance of fr-4 Laminates in the Manufacturing Process of Printed Circuit Boards.
Published 2016“…In 2006 the Restriction of Hazardous Substances (RoHS) prohibited the use of lead (Pb) in solder paste, which has a melting temperature around 180oC, whereas lead-free solder pastes have a melting point around 230oC, 30oC-40oC higher than Pb solder paste, this has generated PCB thermo mechanical problems due to the temperature increase at which the material is exposed. …”
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Thermomechanical Performance of fr-4 Laminates in the Manufacturing Process of Printed Circuit Boards.
Published 2016“…In 2006 the Restriction of Hazardous Substances (RoHS) prohibited the use of lead (Pb) in solder paste, which has a melting temperature around 180oC, whereas lead-free solder pastes have a melting point around 230oC, 30oC-40oC higher than Pb solder paste, this has generated PCB thermo mechanical problems due to the temperature increase at which the material is exposed. …”
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Bioestratigrafía y microfacies de la formación cuesta del cura (cretácico inferior) en la Cañada Guadalupe del municipio de Iturbide, Nuevo León, México.
Published 2018“…The scarcity of information available to the focal points of this research is based on more complex organisms such as ammonoids and other macroscopic organisms, which is why the lack of studies based on foraminifera has not allowed establish more concrete biostratigraphic sequences. …”
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Bioestratigrafía y microfacies de la formación cuesta del cura (cretácico inferior) en la Cañada Guadalupe del municipio de Iturbide, Nuevo León, México.
Published 2018“…The scarcity of information available to the focal points of this research is based on more complex organisms such as ammonoids and other macroscopic organisms, which is why the lack of studies based on foraminifera has not allowed establish more concrete biostratigraphic sequences. …”
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Impacto ambiental de la Industria Maquiladora en Nogales, Sonora
Published 2018Get full text
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Randomized clinical trial to evaluate the effect of fecal microbiota transplant for initial Clostridium difficile infection in intestinal microbiome
Published 2017“…In the FMT-FURM group, the bacterial composition was dominated by Firmicutes, Bacteroidetes, and Proteobacteria at all-time points and the microbiota were remarkably stable over time. …”
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EVALUACIÓN DEL CONOCIMIENTO DEL DAÑO A LA SALUD POR CONSUMO DE ALCOHOL Y TABACO EN ESTUDIANTES PREUNIVERSITARIOS, CON INCLINACIÓN AL AREA DE LA SALUD E INGENIERIA EN MONTERREY, N.L...
Published 2002“…Por otra parte, se ha podido comprobar, que no existe diferencia significativaen el conocimiento del daño a la salud por el consumo de alcohol y tabaco; por lo cualno se puede considerar como un factor protector el tener una propensión de educacióncircunscrita a la salud.AbstractThe consumption of alcohol and tobacco is a remarkable social problem, and it is thatthere is a modification in the use pattern and in the class of the consumers. Numerousstudies point out the adolescent stage as that of more risk in the beginning of theconsumption of alcohol and tobacco, oscillating the age and indicating that if it isbegun in this habit to an early age the risk it increases. …”
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La docencia en el nivel superior desde la perspectiva del profesor universitario
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Gestión de la seguridad de las empresas prestadoras de servicio logístico en Colombia
Published 2020“…The total number of respondents is certified in the BASC Standard, but only 43% certified in ISO 28000, the operators point out that the involvement with suppliers and the cultural change in the organization are obstacles to the implementation of ISO 28000. …”
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