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The effects of temperature on the structure and morphology of (Ti,Al)N coatings
(Ti,Al)N films were grown on a susbtrate of stainless steel by means PAPVD by controlled pulsed cathodic arc technique usinga target of TiAl (50/50 % atomic) in an Ar + N atmosphere. The coatings were deposited at different ... -
Toxicidad aguda de una formulación comercial de glifosato sobre Poecilla reticulata (pisces:poecilidae) en condiciones de laboratorio
El glifosato es un herbicida ampliamente usado en Colombiatanto en actividades agrícolas como para la erradicación de cultivosilícitos. La deriva por viento en aspersiones aéreas y la lixiviación deeste producto pueden ... -
Una nota sobre la transformada de Fourier en espacios de Hölder
En este artículo, se estudia la acotación de la transformada periódica de Fourier desde espacios de Lebesgue a Espacios Hölder. Par- ticularmente, se generaliza un resultado clásico de Bernstein. -
Use of personalized academic text in Politécnico Grancolombiano
The assignment of personalized academic tests, aside from contributing to the eradication of fraud and plagiarism, make possible a better classroom climate. In this article we review some tools used to generate multiple ... -
XPS study for CZTS thin films growth by PVD co-evaporation method
This study shows the preparation of different Cu2ZnSnS4 thin films, following the co-evaporation route of metals (Cu, Sn and Zn Zn) in sulfur atmosphere, in three steps sulfide formation. The best results were acquired by ...