Listar Publicaciones Científicas Nanociencias y Materiales por fecha de publicación
Mostrando ítems 61-80 de 564
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Genetic algorithm optimization of entanglement
(2006)"We present an application of a genetic algorithmic computational method to the optimization of the concurrence measure of entanglement for the cases of one dimensional chains, as well as square and triangular lattices in ... -
Síntesis y caracterización de nanotubos por molienda mecánica
(2006)"En este trabajo se presentan los resultados concernientes a la síntesis y caracterización de nanotubos de nitruro de boro producidos por un método de molienda mecánica-tratamiento térmico. En la primera etapa, el polvo ... -
Magnetic properties of Fe nanoclusters: ab initio calculations of FeN N = 9,15, 27, 51, and 59
(Sociedad Mexicana de Física, A. C., 2006)"The magnetic properties of iron clusters (FeN, N = 9, 15, 27, 51, and 59 atoms) at T = 0 K with bcc–like structure and bulk parameters are studied using ab initio methods. In these studies we consider the spin–orbit ... -
Self-image effects in diffraction and dispersion
(2006-06)"Talbot's self-imaging effect occurrs in near-field diffraction. In the rational paraxial approximation, the Talbot images are formed at distances z=p/q, where p and q are coprimes, and are superpositions of q equally ... -
Niederhauser's model for epilepsy and wavelet methods
(2006-06)"Wavelets and wavelet transforms (WT) could be a very useful tool to analyze electroencephalogram (EEG) signals. To illustrate the WT method we make use of a simple electric circuit model introduced by Niederhauser [1], ... -
A multidisciplinary study of carbon nanotube structures: from inorganic to biological systems
(2006-07)"The aerosol pyrolysis technique was used to produce carbon based nanostructures. Monocrystalline FeCo nanowires encapsulated inside multi-walled carbon nanotubes (MWNTs), centimeter-long strands of wide single walled ... -
Polystyrene grafting of CNx nanotubes for the elaboration of polystyrene-based nanocomposites.
(2007)"This thesis is concerned to the development of novel engineered surface materials using nitrogen-doped carbon nanotubes (CNx) that were grafted with polystyrene (PS) chains using in situ radical polymerization controlled ... -
Magnetism of carbon nanostructures and in situ TEM dynamic transformations of carbon-based nanomaterials.
(2007)"Durante las últimas dos décadas se ha logrado sintetizar materiales de carbono con distintas formas estructurales y dimensiones en el orden de nanómetros, siendo los fullerenos y los nanotubos de carbono (NTC) dos ejemplos ... -
Electronic trasport and mechanical properties in nanostructures.
(2007)"El trabajo de investigacion doctoral se ha desarrollado sobre transporte electronico en moleculas organicas e inorganicas y sobre el estudio de propiedades mecanicas en nanoestructuras bajo presion. Para la primera parte ... -
PI-controlled bioreactor as a generalized Liénard system
(Elsevier, 2007)"It is shown that periodic orbits can emerge in Cholette’s bioreactor model working under the influence of a PI-controller. We find a diffeomorphic coordinate trans-formation that turns this controlled enzymatic reaction ... -
High-gain nonlinear observer for simple genetic regulation process
(Elsevier, 2007)"High-gain nonlinear observers occur in the nonlinear automatic control theory and are in standard usage in chemical engineering processes. We apply such a type of analysis in the context of a very simple one-gene reg-ulation ... -
La codificación de los quipus incas
(2007) -
FRW barotropic zero modes: dynamical systems observability
(2007)"The dynamical systems observability properties of barotropic bosonic and fermionic FRW cosmological oscillators are investigated. Nonlinear techniques for dynamical analysis have been recently developed in many engineering ... -
On the anisotropy in the HRTEM images of a decagonal quasicrystalline phase of the Al-Cu-Co-Si system
(2007)"Experimental evidence of an electrical and/or magnetic anisotropy was observed in the high resolution transmission electron microscope (HRTEM) images of a decagonal quasicrystalline (DQC) phase of the Al-Cu-Co-Si system. ... -
New advances in magnetic nanostructures
(2007)"Some of the new developments on magnetic nanostructures are reviewed. The advances on the synthesis, characterization, and understanding of magnetic nanoclusters, magnetic nanowires and single molecule magnets are discussed. ... -
El meteorito Charcas y su impacto
(Sociedad Mexicana de Física, 2007) -
Stationary states in a potential well
(UNESCO, 2007)"In the early days of the 20th century a set of important observations in atomic and molecular physics could not be explained on the basis of the laws of classical physics. One of the main findings was the emission of light ... -
Enhanced thermal conductivity of carbon fiber/phenolic resin composites by the introduction of carbon nanotubes
(2007-02)"The authors report a significant enhancement in the thermal conductivity of a conventional carbon fiber/phenolic resin composite system when adding highly crystalline multiwalled carbon nanotubes. They demonstrate that ... -
Pure and doped boron nitride nanotubes
(2007-05)"More than ten years ago, it was suggested theoretically that boron nitride (BN) nanotubes could be produced. Soon after, various reports on their synthesis appeared and a new area of nanotube science was born. This review ... -
Enhanced tunneling through nonstationary barriers
(2007-11)"Quantum tunneling through a nonstationary barrier is studied analytically and by a direct numerical solution of Schrödinger equation. Both methods are in agreement and say that the main features of the phenomenon can be ...