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  1. 281

    Thermomechanical Performance of fr-4 Laminates in the Manufacturing Process of Printed Circuit Boards. por Rodríguez Vázquez, Carlos Alfonso

    Publicado 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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    Tesis
  2. 282

    Thermomechanical Performance of fr-4 Laminates in the Manufacturing Process of Printed Circuit Boards. por Rodríguez Vázquez, Carlos Alfonso

    Publicado 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. …”
    Enlace del recurso
    Tesis
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  9. 289

    Factores que determinan la demanda y su utilidad en la toma de decisiones financieras (Factors that determine the demand and its utility in the financial decision making) por Cortez Alejandro, Klender Aimer, Lazo Freymannt, Ricardo Guillermo, Rodríguez, M.

    Publicado 2008
    “…In addition, the importance of the estimation of sales since they will serve as departure point for the adapted decision making of financial character in the organizations, by such reason considers is due to have special well-taken care of in its elaboration. …”
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    Artículo
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    Estructura de edades, densidad y regeneración de Pinus hartwegii en un gradiente de elevación. por Cortés Cabrera, Héctor Enrique

    Publicado 2018
    “…Regeneration was sampled in plots, while adult individuals were sampled by the point centered quarter method. Density of adult individuals and regeneration were higher at lower elevations, while individuals with fire scars showed similar density across elevations. …”
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  12. 292

    Estructura de edades, densidad y regeneración de Pinus hartwegii en un gradiente de elevación. por Cortés Cabrera, Héctor Enrique

    Publicado 2018
    “…Regeneration was sampled in plots, while adult individuals were sampled by the point centered quarter method. Density of adult individuals and regeneration were higher at lower elevations, while individuals with fire scars showed similar density across elevations. …”
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    Tesis
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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... por Villarreal Villarreal, Fidel, Cantú Martínez, Pedro César

    Publicado 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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  20. 300

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