Virial masses of late-type galaxies from the SDSS DR16

Motivated by the challenges of calculating the dynamical masses of late-type galaxies (LTGs) and the enormous amount of data from the Sloan Digital Sky Survey (SDSS), we calculate virial masses of a sample of approximately 126 000 LTGs from the sixteenth data release of the SDSS. The virial mass estimations were made considering Newtonian mechanics, virial equilibrium and velocity dispersion from stars and gas. The procedure gave as a result seven mass estimations for each galaxy. The calculated masses were calibrated using a sample of spiral galaxies with velocity rotation curves. Considering the results from the calibration, we find that the correlation between virial and dynamical (rotation curve) masses is stronger for high inclination values. Therefore, the calibration relies more on the available data for higher inclination angle galaxies. We also show that if we have a heterogeneous sample of galaxies one must take into consideration the size and colour of these galaxies by using the following variables: Sersic index n, concentration index, and colour of the stars. For relatively smaller and bluer LTGs, the gas velocity dispersion provides a more consistent mass calculation, while for LTGs that are relatively larger and redder the stellar velocity dispersion provides a better correlated mass calculation.Fil: Nigoche Netro, A.. Universidad de Guadalajara; México. Instituto de Astronomía y Meteorologia de la Universidad de Guadalajara; MéxicoFil: De La Fuente, E.. Universidad de Guadalajara; México. University of Tokyo; JapónFil: Diaz, Ruben Joaquin. United States Gemini Office; Estados Unidos. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Agüero, Maria Paz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Kemp, S. N.. Instituto de Astronomía y Meteorologia de la Universidad de Guadalajara; MéxicoFil: Marquez Lugo, R. A.. Instituto de Astronomía y Meteorologia de la Universidad de Guadalajara; MéxicoFil: Lagos, P.. Centro de Astrofísica Da Universidade Do Porto; PortugalFil: Ruelas Mayorga, A.. Universidad Nacional Autónoma de México; MéxicoFil: López Contreras, N. L.. Instituto de Astronomía y Meteorologia de la Universidad de Guadalajara; Méxic

Nanotecnología y nanoencapsulación de plaguicidas

This paper is about nano-technology perspectives and their applications in the pesticides development. Information on companies that are participating in microencapsulate pesticide production is present, as well as nanotechnology concepts, and companies that make micro and nanoencapsulate pest formulations.En el presente trabajo se dan a conocer las perspectivas sobre el uso de la nanotecnología en la elaboración de plaguicidas, sus ventajas tecnológicas sobre las formulaciones actuales y sus posibilidades de uso en los esquemas de desarrollo rural sustentable. Se definen algunos términos utilizados en nanotecnología y se hace una revisión de investigaciones y empresas que participan en el desarrollo de plaguicidas micro y nanoencapsulados

ACHIEVEMENT LEVEL OF TEACHING SKILLS IN THE CONCLUSION PROFORDEMS ITSON AND IMPACT ON SOCIETY

The Teacher Training Program of Higher Education Media (PROFORDEMS), aims to contribute to the educational profile in skills development. This study aims to determine the level of achievement reached graduates considered teachers regarding teaching skills training process to conclude the paragraph after performing the analysis of as it impacts on society. The method was quantitative, applied for UN compound instrument teaching skills and attributes, with Likert scale Establishing the four levels of Tobon, 76 graduate teachers of the seventh generation of the Technological Institute of Sonora, of which Were Significantly of the headquarters of Navojoa and Obregón, Navojoa Being 47 with the participation of 20 women and 27 men, regarding Obregon Participants were 17 women and 12 men. Were the results satisfactory, over 65% of graduates found in the teachers considered autonomous and strategic levels, competition four is the one that obtained the lowest percentage. To conclude that the PROFORMDES contributes to teaching skills