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

“…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. por Rodríguez Vázquez, Carlos Alfonso

“…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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Diferencias de género en las actitudes hacia las matemáticas = Gender differences in attitudes toward mathematics por De la Torre Gamboa, Martha Patricia, Ramírez Martínez, Martín

“…Abstract The results of previous research do not allow us to generalize the existence of gender differences in attitudes toward mathematics, however they coincide in the majority in pointing out that men have a greater extrinsic motivation, that they show greater confidence in their future achievements in the area of mathematics, less anxiety about mathematics and attribution of success to external causes. …”
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La autocomposición como una ventaja de la medición familiar en la legislación ecuatoriana por Parra Vicuña, Raúl, Sánchez García, Arnulfo

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Estado nutricio, actividad física y gasto energético en estudiantes universitarios del área de la salud. por Gómez Infante, Eduardo Alberto

“…The university population is considered a vulnerable group from the nutritional point of view, since it goes through a critical period in the consolidation of eating habits and behaviors. …”
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Estado nutricio, actividad física y gasto energético en estudiantes universitarios del área de la salud. por Gómez Infante, Eduardo Alberto

“…The university population is considered a vulnerable group from the nutritional point of view, since it goes through a critical period in the consolidation of eating habits and behaviors. …”
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