A Simplified Approach to Optimally Controlled Quantum Dynamics

A new formalism for the optimal control of quantum mechanical physical observables is presented. This approach is based on an analogous classical control technique reported previously[J. Botina, H. Rabitz and N. Rahman, J. chem. Phys. Vol. 102, pag. 226 (1995)]. Quantum Lagrange multiplier functions are used to preserve a chosen subset of the observable dynamics of interest. As a result, a corresponding small set of Lagrange multipliers needs to be calculated and they are only a function of time. This is a considerable simplification over traditional quantum optimal control theory[S. shi and H. Rabitz, comp. Phys. Comm. Vol. 63, pag. 71 (1991)]. The success of the new approach is based on taking advantage of the multiplicity of solutions to virtually any problem of quantum control to meet a physical objective. A family of such simplified formulations is introduced and numerically tested. Results are presented for these algorithms and compared with previous reported work on a model problem for selective unimolecular reaction induced by an external optical electric field.Comment: Revtex, 29 pages (incl. figures

Optimal Control of Molecular Motion Expressed Through Quantum Fluid Dynamics

A quantum fluid dynamic control formulation is presented for optimally manipulating atomic and molecular systems. In quantum fluid dynamic the control quantum system is expressed in terms of the probability density and the quantum current. This choice of variables is motivated by the generally expected slowly varying spatial-temporal dependence of the fluid dynamical variables. The quantum fluid dynamic approach is illustrated for manipulation of the ground electronic state dynamics of HCl induced by an external electric field.Comment: 18 pages, latex, 3 figure

Clasificación automática de las vocales en el lenguaje de señas colombiano

Sign language recognition is a highly-complex problem due to the amount of static and dynamic gestures needed to represent such language, especially when it changes from country to country. This article focuses on static recognition of vowels in Colombian Sign Language. A total of 151 images were acquired for each class, and an additional non-vowel class with different scenes was also considered. The object of interest was cut out of the rest of the scene in the captured image by using color information. Subsequently, features were extracted to describe the gesture that corresponds to a vowel or to the class that does not match any vowel. Next, four sets of features were selected. The first one contained all of them; from it, three new sets were generated. The second one was extracted from a subset of features given by the Principal Component Analysis (PCA) algorithm. The third set was obtained by Sequential Feature Selection (SFS) with the FISHER measure. The last set was completed with SFS based on the performance of the K-Nearest Neighbor (KNN) algorithm. Finally, multiple classifiers were tested on each set by cross-validation. Most of the classifiers achieved a performance over 90%, which led to conclude that the proposed method allows an appropriate class distinction.El reconocimiento del lenguaje de señas es un problema de alta complejidad, debido a la cantidad de gestos estáticos y dinámicos necesarios para representar dicho lenguaje, teniendo en cuenta que el mismo variará para cada país en particular. Este artículo se enfoca en el reconocimiento de las vocales del lenguaje colombiano de señas, de forma estática. Se adquirieron 151 imágenes por cada clase, teniendo en cuenta también una clase no vocal adicional con diferentes escenas. A partir de cada imagen capturada se separa el objeto de interés del resto de la escena usando información de color; luego, se extraen características para describir el gesto correspondiente a cada vocal o a la clase que no corresponde a ninguna vocal. Posteriormente, se seleccionan cuatro conjuntos de características. El primero con la totalidad de ellas; a partir de este salen tres nuevos conjuntos: el segundo extrayendo un subconjunto de características mediante el algoritmo de Análisis de Componentes Principales (PCA). El tercer conjunto, aplicando Selección Secuencial hacia Adelante (SFS), mediante la medida de FISHER y el último conjunto con SFS basado en el desempeño del clasificador de los vecinos más cercanos (KNN). Finalmente se prueban múltiples clasificadores para cada conjunto por medio de validación cruzada, obteniendo un desempeño superior al 90% para la mayoría de los clasificadores, concluyendo que la metodología propuesta permite una adecuada separación de las clases

Optical creation of vibrational intrinsic localized modes in anharmonic lattices with realistic interatomic potentials

Using an efficient optimal control scheme to determine the exciting fields, we theoretically demonstrate the optical creation of vibrational intrinsic localized modes (ILMs) in anharmonic perfect lattices with realistic interatomic potentials. For systems with finite size, we show that ILMs can be excited directly by applying a sequence of femtosecond visible laser pulses at THz repetition rates. For periodic lattices, ILMs can be created indirectly via decay of an unstable extended lattice mode which is excited optically either by a sequence of pulses as described above or by a single picosecond far-infrared laser pulse with linearly chirped frequency. In light of recent advances in experimental laser pulse shaping capabilities, the approach is experimentally promising.Comment: 20 pages, 7 eps figures. Accepted, Phys. Rev.

METODOLOGÍA PARA DETERMINAR LA BASE DE LIQUIDACIÓN DE APORTES PARAFISCALES PARA LOS EMPRESARIOS DEL DEPARTAMENTO DEL QUINDIO

Los motivos que orientan el establecimiento de una metodología para determinar la base de liquidación de aportes parafiscales en el sector empresarial del Departamento del Quindío y cumplir con los objetivos antes planteados, surgen como una necesidad para resolver los problemas que existen o se generan entre los contribuyentes y las entidades recaudadoras de los aportes parafiscales.PregradoContador Públic

Evaluación nematicida del aceite esencial de Tagetes zypaquirensis en el manejo del nematodo Meloidogyne spp.

Lulo (Solanum quitoense Lam.), an Andean fruit, is economically important in Colombia, however, cultivated areas as well as yields, have suffered a considerable reduction by the attack of pathogens such as the rootknot nematode Meloidogyne spp. with losses near to 50%. In nature, there are different plant with nematicides properties which could diminish the effects of this nematode, such as the Tagetes genre. The objective of this research was to evaluate the nematicidal activity of the essential oil from Tagetes szypaquirensis on Meloidogyne spp. Four concentrations of essential (100, 200, 400, 800mg/kg of soil) were evaluated under greenhouse conditions. These doses were applied to nematodes in the second instar approximately +400 J2/100g of soil. Moreover, three treatments were established: the first with no application of essential oil, the second without nematode, and the third with soil treated with carbofuran (33.2%) at dose of 2cc/L. For each treatment the variables evaluated were: level of severity, plant height, fresh and dry weight, fresh root weight, number of nematode eggs/100g roots and number of J2/100g of soil. The main components of the essential oil from T. zypaquirensis were dihydrotagetone and E-tagetone with a composition of 42.2% and 22.9% respectively. The results indicated that a concentration 800mg/kg of essential oil had the same nematicidal action than soil treated with carbofuran, same population constrains and phitometric variables. It was concluded that T. zypaquirensis essential oil can be an alternative for managing root knot disease.El lulo (Solanum quitoense Lam.) es un frutal andino de gran importancia económica en Colombia, sin embargo, las áreas sembradas y rendimientos han sufrido una evidente reducción debido al ataque de patógenos como el nematodo Meloidogyne spp., que ha ocasionado pérdidas de hasta 50%. En la naturaleza existen diferentes recursos vegetales con propiedades nematicidas, destacándose al género Tagetes. El objetivo de esta investigación fue evaluar la actividad nematicida del aceite esencial de Tagetes zypaquirensis sobre Meloidogyne spp. Bajo condiciones de invernadero se evaluaron cuatro concentraciones del aceite esencial (100, 200, 400, 800mg/kg de suelo) las cuales fueron aplicadas a un suelo con juveniles de segundo estadio del nematodo +400 J2/100g. Además, se establecieron tres comparadores: un tratamiento sin aplicación de aceite esencial, un suelo sin nematodo y un suelo tratado con i.a carbofuran (33,2%) bajo una dosis de 2cc/L. Para cada tratamiento, las variables a evaluar fueron: severidad, altura de planta, peso fresco y seco al aire, peso fresco radical, número de huevos del nematodo/100g raíz y número de J2/100g de suelo. Los componentes mayoritarios del aceite esencial de T. zypaquirensis fueron dihidrotagetona y E-tagetona con una proporción relativa de 42,2 y 22,9%, respectivamente. Los resultados indicaron, que la concentración 800mg/kg de aceite esencial presentó la misma acción nematicida que el suelo tratado con carbofuran al reducir las poblaciones de Meloidogyne spp. y presentar valores similares en las variables fitométricas. Se concluye que el aceite esencial T. zypaquirensis puede ser una alternativa para el manejo de la enfermedad del nudo radical

2014 19th Symposium on Image, Signal Processing and Artificial Vision, STSIVA 2014

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