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    Desarrollo histórico de la educación a distancia (Historical development of distance education) by Jardines Garza, Francisco Javier

    Published 2009
    “…In this paper we describe the historical development in distance education from a general point of view. We resume the historical evolution of internet, and its relationship with important social issues as communication, defense, and education. …”
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    Article
  3. 103

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

    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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    Tesis
  4. 104

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

    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. …”
    Get full text
    Tesis
  5. 105

    Arcos magmáticos del ordovícico y del carbonífero en el basamento de la Sierra Madre Oriental en el Anticlinorio Huizachal Peregrina. by Alemán Gallardo, Eduardo Alejandro

    Published 2016
    “…Estos cuerpos ígneos son clave para entender las condiciones geodinámicas de la evolución del NE de México durante el Paleozoico. …”
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    Tesis
  6. 106

    Arcos magmáticos del ordovícico y del carbonífero en el basamento de la Sierra Madre Oriental en el Anticlinorio Huizachal Peregrina. by Alemán Gallardo, Eduardo Alejandro

    Published 2016
    “…Estos cuerpos ígneos son clave para entender las condiciones geodinámicas de la evolución del NE de México durante el Paleozoico. …”
    Get full text
    Tesis
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    Nuevos objetivos de la educación superior: idealidad y realidad de la universidad pública en México (New objectives of higher education: ideality and reality of the public universi... by Jiménez Gómez, Enrique

    Published 2004
    “…Resumen. Este ensayo plantea en términos generales que la educación como compromiso fundamental del estado no ha estado a la altura del reto del tercer milenio. …”
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    Article
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