Customer relationship management (CRM ) : Administración de las relaciones con el cliente

Tesina (Maestro en Informática Administrativa) U.A.N.L.

Las grandes constructoras de Monterrey: estudio no paramétrico de consistencia en las determinantes de la productividad

[Tesis] ( Maestría en Administración de la Construcción) U.A.N.L.

Factores de riesgo para cáncer cervicouterino en mujeres de Matamoros, Tamaulipas

[Tesis] (Maestría en ciencias de Enfermería con Enfasis en Salud Comunitaria) U.A.N.L.

Densidad de siembra y su efecto en la producción de biomasa de coriandrum sativum cultivado en forma hidropónica.

Tesis (Maestría en Ciencias en Producción Agrícola) UANL, 2011.

Identificación de fuentes de contaminación durante la producción de tomate (lycopersicon esculentum mill.) en el Estado de Nuevo León, México.

Tesis (Maestría en Ciencias con Acentuación en Microbiología) UANL, 2012.

La Facultad de Ciencias de la Comunicación, UANL : orígenes y evolución

UANL

Taller de Redacción I

UANL

Taller de Redacción I

UANL

Psicología de la publicidad

UANL

Echinococcus granulosus : participación de citocinas en la regulación de la respuesta inmune en Hidatidosis experimental

Tesis (Doctorado en Ciencias con Especialidad en Microbiología) UANL

Mapeo genético de un nuevo síndrome ligado al cromosoma X en una familia mexicana.

Tesis (Doctor en Ciencias con Orientación en Morfología) UANL, 2012.

Quantum decay of metastable states in small magnetic particles

We present an imaginary-time path-integral study of the problem of quantum decay of a metastable state of a uniaxial magnetic particle placed in the magnetic field at an arbitrary angle. Our findings agree with earlier results of Zaslavskii obtained by mapping the spin Hamiltonian onto a particle Hamiltonian. In the limit of low barrier, weak dependence of the decay rate on the angle is found, except for the field which is almost normal to the anisotropy axis, where the rate is sharply peaked, and for the field approaching the parallel orientation, where the rate rapidly goes to zero. This distinct angular dependence, together with the dependence of the rate on the field strength, provides an independent test for macroscopic spin tunneling.

Threading dislocation lines in two-sided flux-array decorations

Two-sided flux decoration experiments indicate that threading dislocation lines (TDLs), which cross the entire film, are sometimes trapped in metastable states. We calculate the elastic energy associated with the meanderings of a TDL. The TDL behaves as an anisotropic and dispersive string with thermal fluctuations largely along its Burgers vector. These fluctuations also modify the structure factor of the vortex solid. Both effects can, in principle, be used to estimate the elastic moduli of the material.

Elasticity and melting of vortex crystals in anisotropic superconductors: Beyond the continuum regime.

The elastic moduli of vortex crystals in anisotropic superconductors are frequently involved in the investigation of their phase diagram and transport properties. We provide a detailed analysis of the harmonic eigenvalues (normal modes) of the vortex lattice for general values of the magnetic field strength, going beyond the elastic continuum regime. The detailed behavior of these wave-vector-dependent eigenvalues within the Brillouin zone (BZ), is compared with several frequently used approximations that we also recalculate. Throughout the BZ, transverse modes are less costly than their longitudinal counterparts, and there is an angular dependence which becomes more marked close to the zone boundary. Based on these results, we propose an analytic correction to the nonlocal continuum formulas which fits quite well the numerical behavior of the eigenvalues in the London regime. We use this approximate expression to calculate thermal fluctuations and the full melting line (according to Lindeman's criterion) for various values of the anisotropy parameter.

Statistical dynamics of dislocation systems: The influence of dislocation-dislocation correlations.

During plastic deformation of crystalline materials, the collective dynamics of interacting dislocations gives rise to various patterning phenomena. A crucial and still open question is whether the long range dislocation-dislocation interactions which do not have an intrinsic range can lead to spatial patterns which may exhibit well-defined characteristic scales. It is demonstrated for a general model of two-dimensional dislocation systems that spontaneously emerging dislocation pair correlations introduce a length scale which is proportional to the mean dislocation spacing. General properties of the pair correlation functions are derived, and explicit calculations are performed for a simple special case, viz pair correlations in single-glide dislocation dynamics. It is shown that in this case the dislocation system exhibits a patterning instability leading to the formation of walls normal to the glide plane. The results are discussed in terms of their general implications for dislocation patterning.