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  1. 141

    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
  2. 142

    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
  3. 143
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  12. 152

    Capacitación laboral en herramientas digitales por Hernández Moreno, Laura Alicia, Hernández Saldaña, Ma. de Lourdes, Tovar Morales, María Teresa

    Publicado 2022
    “…El porcentaje más alto de capacitación se da en las herramientas básicas de Microsoft Office con un 30% (Word, Excel y PowerPoint), seguida de los paquetes especializados con un 28.2%, tales como, SPSS, Contpaqi, Aspel SAE, ERP SAP, Photoshop, entre otros. …”
    Enlace del recurso
    Artículo
  13. 153

    PLANTAS NATIVAS USADAS COMO ALIMENTOS, CONDIMENTOS Y BEBIDAS DE LAS COMUNIDADES VEGETACIONALES DESERTICAS O SEMIDESERTICAS EN NUEVO LEON, MEXICO. por Alanis Flores, Glafiro J.

    Publicado 2001
    “…Samples of analyzed botanical rest of furnaces and stones of milling in thearea of Boca de Potrerillos, Mina, N.L, show that regional indigenous groups alreadyused the native flora for their subsistence. …”
    Enlace del recurso
    Artículo
  14. 154
  15. 155

    Quality evaluation of the educational systems & educational administration and institutions (Evaluación de calidad de un sistema educativa: aspectos educativos e institucionales) por Pazhakh, A.R.

    Publicado 2006
    “…Different analytical and conceptual approaches to these points are given. Conclusions are drawn and future lines of research in these topics are suggested and pointed out. …”
    Enlace del recurso
    Artículo
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