Listar por autor "ebec1570-5df5-471b-9bd6-df498ab4f6a6"
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El Eclipse total de Sol del 11 de Julio de 1991: Aspectos Generales.
Azofeifa Alvarado, Daniel E.; Fernández Rojas, Walter; Villalobos M., José Alberto (San José, CR: Editorial de la Universidad de Costa Rica, 1992)El 11 de junio de 1991 ocurrió un eclipse total de sol, el cual se pudo observar en casi todo el territorio de Costa Rica. El presente artículo explica en que consistió el fenómeno y describe las características principales ... -
Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling
Vargas Castro, William E.; Hernández Jiménez, Marcela; Libby Hernández, Eduardo; Azofeifa Alvarado, Daniel E.; Barboza Aguilar, Cinthya; Solís Blanco, Ángel Arturo (2016)Cuticles of some Chrysina scarabs are characterized by flat, graded, and twisted structures of nanosized chitin fibrils. As inferred from SEM images, each species has its own spatial period or pitch P which is dependent ... -
Room temperature gas-solid reaction of titanium on glass surfaces forming a very low resistivity layer
Solís Sánchez, Hugo; Clark Binns, Neville; Azofeifa Alvarado, Daniel E.; Avendaño Soto, Esteban (2016-09)Titanium films were deposited on quartz, glass, polyamide and PET substrates in a high vacuum system at room temperature and their electrical resistance monitored in vacuo as a function of thickness. These measurements ... -
Synthesis and characterization of Cu(II) containing PMMA co-polymer for optical applications
Rojas Bolaños, Omar; Araya Arguedas, Miguel; Montero Villalobos, Mavis Lili; Azofeifa Alvarado, Daniel E.; Vargas Castro, William E. (2007-04-03)Homogenous, transparent, greenish blue Cu(II) containing PMMA co-polymer disks were prepared through the radical polymerization of the Cu(II) methac rylate, MMA and HMA using AIBN as an initiator. The dependence of the ...