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A. Pérez-Pacheco
Researcher at National Autonomous University of Mexico
Publications - 7
Citations - 29
A. Pérez-Pacheco is an academic researcher from National Autonomous University of Mexico. The author has contributed to research in topics: Medicine & Photoacoustic effect. The author has an hindex of 3, co-authored 3 publications receiving 24 citations.
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Journal ArticleDOI
Evidence of the semiconductor-metal transition in V2O5 thin films by the pulsed laser photoacoustic method
A. Pérez-Pacheco,D. R. Acosta-Najarro,R. Castañeda-Guzmán,H. Cruz-Manjarrez,Luis Rodríguez-Fernández,J. C Pineda-Santamaría,Manuel Aguilar-Franco +6 more
TL;DR: In this paper, a pulsed photoacoustic technique was used to investigate the semiconductor-metal transition of thin vanadium pentoxide films (V2O5) under increasing temperature.
Journal ArticleDOI
Phase transition of TiO2 thin films detected by the pulsed laser photoacoustic technique
A. Pérez-Pacheco,R. Castañeda-Guzmán,C. Oliva Montes de Oca,A. Esparza-García,S. J. Pérez Ruiz +4 more
TL;DR: In this paper, photoacoustic measurements were used to determine the ablation threshold and phase transitions from amorphous to crystalline states. But the phase transformations were induced by controlled temperature scanning and then corroborated with Raman spectroscopy measurements.
Journal ArticleDOI
Photoacoustic analysis of the evolution from sols to aged gels: Comparison of different initial titania sols
TL;DR: In this article, the use of correlation analysis of photoacoustic signal changes during the sol-gel-aging evolution of titania sols prepared from the hydrolysis of titanium n-butoxide in alcoholic, aqueous, and micellar media which provide different initial conditions and different evolution pathways is proposed.
Journal ArticleDOI
Chronotropic Response and Heart Rate Variability before and after a 160 m Walking Test in Young, Middle-Aged, Frail, and Non-Frail Older Adults
Lesli Aide Alvarez-Millán,Claudia Lerma,Daniel Castillo-Castillo,Rosa M Quispe-Siccha,A. Pérez-Pacheco,Jesús Rivera-Sánchez,Ruben Fossion +6 more
TL;DR: In this article , the authors studied the chronotropic response (HR and HRV) to a walking test and also analyzed HRV indices in rest as potential biomarkers of frailty, being LF (nu) and the time required to reach the maximum HR the best candidates.
Journal ArticleDOI
Direct measurement of solids thermal effusivity by cw photoacoustic technique
David Gasca-Figueroa,Gerardo Gutiérrez-Juárez,F. J. García-Rodríguez,Luis Polo-Parada,A. Pérez-Pacheco,Mariela Bravo-Sanchez +5 more
TL;DR: In this paper , a new approach based on a variant of differential photoacoustic (PA) cells, and a first-order approximation of RG model, is used to measure directly the thermal effusivity in solids.