Los divinos y los humanos

UANL

Caracterización de cepas de bacillus thuringiensis y su toxicidad contra tres poblaciones de aedes aegypti.

Tesis (Doctor en Ciencias con Especialidad en Biotecnología) UANL, 2010.

Determinación y caracterización molecular de géneros de trichogrammatidae y especies de buksiella y zagella en México.

Tesis (Doctor en Ciencias Biológicas con Especialidad en Entomología) UANL, 2010.

Régimen de fuego y sus efectos ecológicos en un bosque de coníferas en la Sierra Madre Oriental, México.

Tesis (Doctorado en Ciencias con Especialidad en Manejo de Recursos Naturales) UANL, 2013.

Flora, vegetación y fitogeografía de la Sierra de Jimulco, Coahuila, México.

Tesis (Doctor en Ciencias con Especialidad en Manejo de Recursos Sustentables) UANL, 2011.

Percepción de las madres con respecto al peso corporal de sus hijos y sus prácticas de alimentación.

Tesis (Doctor en Filosofía con Orientación en Trabajo Social y Políticas Comparadas de Bienestar Social) UANL, 2012.

Protective Liberalization : the state and the Mexican petrochemical industry 1958-2000

This thesis follows and analyses the involvement of both social actors and the state in the industrial transformation of Mexico. While these actors have been key associates in the development of the Mexican economy for decades, with the 1982 debt crisis, and especially after the promotion of a structural reform in 1986, the patterns of their involvement changed. However, this change was more limited than expected, and the state did not abandon its participation in some key industrial sectors. This thesis will demonstrate that the role of the state remained important during the process of change towards an Export-Oriented developmental paradigm, although the state continued to participate in fashioning social relations, it did so in new ways that can be termed “protective liberalization.”

El impacto de la alexitimia y la resiliencia en las fases del proceso del duelo en pacientes con cáncer.

Tesis (Doctorado en Filosofía con orientación en Psicología) UANL, 2014.

Monte Carlo simulation of interface alloying

An Ising-like model, with interactions ranging up to next-nearest-neighbor pairs, is used to simulate the process of interface alloying. Interactions are chosen to stabilize an intermediate "antiferromagnetic" ordered structure. The dynamics proceeds exclusively by atom-vacancy exchanges. In order to characterize the process, the time evolution of the width of the intermediate ordered region and the diffusion length is studied. Both lengths are found to follow a power-law evolution with exponents depending on the characteristic features of the model.

Comment on "Kinetics of spinodal decomposition in the ising model with vacancy diffusion"

In a recent paper [Phys. Rev. B 50, 3477 (1994)], P. Fratzl and O. Penrose present the results of the Monte Carlo simulation of the spinodal decomposition problem (phase separation) using the vacancy dynamics mechanism. They observe that the t1/3 growth regime is reached faster than when using the standard Kawasaki dynamics. In this Comment we provide a simple explanation for the phenomenon based on the role of interface diffusion, which they claim is irrelevant for the observed behavior.

Vibrational behaviour of bcc Cu-based shape memory alloys close to the martensitic transition

Experimental data from ultrasonic and inelastic neutron scattering measurements are analyzed for different families of Cu-based shape-memory alloys. It is shown that the transition occurs at a value, independent of composition and alloy family, of the ratio between the elastic constants associated with the two shears necessary to accomplish the lattice distortion from the bcc to the close-packed structure. The zone boundary frequency of the TA2[110] branch evaluated at the transition point (TM), weakly depends, for each family, on composition. A linear relationship between this frequency and the inverse of the elastic constant C', both quantities evaluated at TM, has been found, in agreement with the prediction of a Landau model proposed for martensitic transformations.

On the stability of the bcc phase in Cu-Al-Mn shape memory alloys

Measurements of the entropy change at the martensitic transition of two composition-related sets of Cu-Al-Mn shape-memory alloys are reported. It is found that most of the entropy change has a vibrational origin, and depends only on the particular close-packed structure of the low-temperature phase. Using data from the literature for other Cu-based alloys, this result is shown to be general. In addition, it is shown that the martensitic structure changes from 18R to 2H when the ratio of conduction electrons per atom reaches the same value as the eutectoid point in the equilibrium phase diagram. This finding indicates that the structure of the metastable low-temperature phase is reminiscent of the equilibrium structure.