Arturo Plata

Arturo Plata
Industrial University of Santander | UIS · School of Physics

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50
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Introduction
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Publications

Publications (50)
Article
Full-text available
Objective: In this present research work the behaviour of temperature of the substrate manufactured in AISI H13 steel, in the range of and , during of surface deposition of titanium nitride (TiN) thin films by the technique of cathodic arc in vacuum. Results: The physical properties of the TiN films were obtained and analysed by the techniques of m...
Article
In this paper we address the problem of estimating the phase from color images acquired with differential-interference-contrast microscopy. In particular, we consider the nonlinear and nonconvex optimization problem obtained by regularizing a least-squares-like discrepancy term with an edge-preserving functional, given by either the hypersurface po...
Article
Full-text available
Introducción: El microscopio de campo claro es una técnica accesible a la mayoría de laboratorios biológicos, así como su adaptación a la fluorescencia. Debido a una disminución en la profundidad de campo, se encuentran presentes varios planos de focalización en los cuales se puede confirmar que la muestra posee un volumen apreciable. Materiales y...
Conference Paper
In this paper we address the problem of reconstructing the phase from color images acquired with differential-interference-contrast (DIC) microscopy. In particular, we reformulate the problem as the minimization of a least–squares fidelity function regularized with a total variation term, and we address the solution by exploiting a recently propose...
Conference Paper
La capacidad de percibir visualmente tres dimen­siones constituye una ventaja importante para la adaptacion al entorno; consciente de esto la humanidad ha desarrollado diferentes tecnicas y tecnologias que permiten replicar este fenomeno a partir de imagenes sinteticas. Los autoestereogramas son un metodo para la presentation de imagenes con profun...
Conference Paper
We present a gradient-based optimization method for the estimation of a specimen's phase function from polychromatic DIC images. The method minimizes the sum of a nonlinear least-squares discrepancy measure and a smooth approximation of the total variation. A new formulation of the gradient and a recent updating rule for the choice of the step size...
Article
Full-text available
The experimental set for artificially modulated structures production through an advanced vacuum arc evaporator with a magnetically-driven cathode spots on the cathode surface is described. The main features of vacuum arc as a vapor source with time-modulated compositions are discussed. The characteristics of the obtained multilayer coatings with a...
Article
Full-text available
The local nanolithography oxidation technique is implemented by using an atomic force microscope (AFM) for the fabrication of nanoscale patterning structures on a silicon substrate covered whit a thin film of silicon nitride. During the fabrication process, the microscope is operated on air and contact mode utilizing a silicon tip covered whit a ha...
Article
Full-text available
Introducción: En este trabajo de investigación se analiza una aleación de Níquel (Ni) y Titanio (Ti). Este tipo de materiales poseen la propiedad Física de memoria de forma; la cual consiste en aplicarle una deformación inicial al material, este puede volver a su estado original aplicándole un estímulo externo (temperatura o fuerza).Materiales y mé...
Article
The fiber density per cross section of the Bamboo Guadua Angustifolia Kunth (GAK) was calculated by digital images processing. Three processes were done in the development of this work: preparation of the samples, digital pre-processing of the images acquired, and digital processing of the images acquired. For the preparation of the samples, the po...
Article
Full-text available
A three-dimensional topographic reconstruction system of the forge pattern surfaces through laser triangulation has been purposely designed and evaluated. With this work, the results of the topographic study of the forge pattern subjected to ion implantation and/or coated with Ti/TiN layer are being presented. Further, the system permits not only t...
Article
In the last twenty years the growth of bacterial colonies has been studied experimentally using images with different growth patterns, but the resolution of those images is in areas of tenths of microns without range information. On the other hand, theoretical studies considering the bacteria as systems with collective behavior controlled by a redu...
Article
En el presente trabajo se muestra parte de una investigación en el área de la óptica y tratamiento de señales. Se realiza una descripción del proceso de reconstrucción topográfica de la superficie del ojo de una mosca casera con un microscopio con resolución de nanómetros. Para la reconstrucción de la superficie del ojo se implementó el método de d...
Conference Paper
A pupillometric system was developed to be used at the Neuroscience and Behavior Research Group from Universidad Industrial de Santander. First of all, an acquisition system (camera) was selected and implemented, taking into account that pupil diameter varies from 1.5 mm up to 8 or 9 mm, reacting to stimuli in 0.2 seconds. Then, the selected camera...
Article
Full-text available
Extended depth of field (EDF) Method is used to analyze and treat specific image zones in optical research. Due to the complexity of the EDF and the possible large volume of data processed in optics problems, EDF is a good candidate to process in parallel architectures. This work is a first approach of implementation of parallel-extended depth of f...
Poster
Full-text available
Implementing Extended Depth of Field on Parallel Architectures
Article
Full-text available
Recibido 30.03.10; Aceptado 20.06.11; Publicado en línea 04.09.11. Resumen Se estudia un vaporizador de arco con el cátodo de titanio que es destinado para desarrollar una tecnología de películas protectoras de metales. Se muestra que a pesar de que el vaporizador se alimenta por un voltaje constante la descarga de arco se enciende en un régimen de...
Article
Full-text available
RESUMEN En muestras de acero H13 fueron depositadas películas de Nitruro de Titanio TiN por el método de deposición física de vapor PVD, se utilizo un microscopio de fuerza atómica AFM con el fin de caracterizar las propiedades morfológicas como tamaño de grano y rugosidad, mediante un análisis de las imágenes obtenidas se encontraron valores de ru...
Article
Ti / TiN films were deposited on H13 steel and silicon substrates with different deposition voltage, by means of the cathodic arc evaporation (CAE) technique, this process was carried out by nanolayers deposition, requiring a detailed survey on growth films, for the properties characterization such as grain size, thickness and roughness of the film...
Article
We evaluate and characterize the surface at the nanoscale level and take into account the temperature variation effect in the process of plasma ion deposition for H13 steel samples coated by Titanium Nitride (TiN). The interferometric microscopy and atomic force microscopy (AFM) were used to measure the film to analyze the variation of structural a...
Article
Full-text available
Resumen— En el presente trabajo se muestra parte de una investigación en el área de la óptica y tratamiento de señales. Se realiza una descripción del proceso de recons-trucción topográfica de la superficie del ojo de una mosca casera con un microscopio con resolución de nanómetros. Para la reconstrucción de la superficie del ojo se imple-mentó el...
Article
We present an automated process for the morphological classification of galaxies in elliptical, spiral, and irregular types. The process can be divided in three stages: (1) Digital treatment of the image: which includes filtering (noise removal), segmentation (image centering and extraction), rotation (to a standard orientation), resizing (to a sta...
Article
We have applied photometric methods to calculate the Toomre parameter of the circumnuclear region of NGC 5427 using visible and near-infrared Hubble Space Telescope images. We study the types of instability that appear in the dynamics, and determine the morphology of this circumnuclear region, from the point of view of a density wave scenario.
Article
En el desarrollo de un trabajo conjunto en el grupo de investigación SCVS, dirigido por el Dr. Jorge Reynolds Pombo, se plantea un estudio sobre la conducta y características del funcionamiento del corazón de la ballena, por un medio no invasivo, realizando la captación de los cantos de la ballena, mediante sonar pasivo de un submarino de la Armada...
Article
Full-text available
An inexpensive solution using an artificial vision system appears to the problem of pointing, tracking and guiding a telescope. A stellar sensor called "R2D2" has been developed. The elements of the system are a CMOS sensor with the respective optics and "Oeil 1.0", a software package that we have developed under the object oriented environment of...
Article
The cross-sectional and longitudinal deformations are determined that undergoes the ferrous materials like Nickelferrous, nonFerrous like the steel 316 and alloys like Nitinol when they are exposed to changes of temperature in the rank of 200 to 320 centigrade. The micro structural transitions that they undergo the metallic materials like the Nitin...
Article
Full-text available
El comportamiento de V838 Mon y la naturaleza de la estrella progenitora no están bien entendidos aún. Recientemente han sido encontradas estrellas de tipo B en la vecindad de V838 Mon y se piensa que ésta podrá ser parte de un cúmulo abierto de población estelar joven. Debido a que el c umulo se encuentra en un brazo espiral de la Galaxia, resulta...
Article
Full-text available
El concepto multidisciplinar de Ciencias Forenses se ha consolidado en los últimos años integrando un amplio espectro de profesionales de distintas disciplinas que ha abierto nuevas áreas de trabajo, en la mayoría de las cuales la interpretación del resultado se basa en la comparación con un material de referencia. Este trabajo pretende exponer bre...
Article
Full-text available
The multidisciplinary concept of Forensic Sciences has been consolidated in the last years integrating a wide spectrum of professionals of different disciplines. New areas of work have been opened, in most of them the result should be interpreted by the comparison with reference samples. This work tries to briefly expose a review of the laboratory...
Article
The Active Galaxy Nuclei AGN are systems whose behavior shows high complexity and multidependency of evolutionary parameters. With this consideration, it is proposed the fractal characterization of an AGN using the analysis of Lacunarity and fractal dimension as a methodology to quantify dynamic space patterns. In general, the fractal set of comple...
Article
Full-text available
En este trabajo se evalúa la Longitudinal Point Spread Function (LPSF) de microscopio confocal cromático, el cual funciona bajo un multiplexado focal generado por una lente difractiva de fresnel. El sistema utiliza como fuente de iluminación supercontínuos generados mediante efectos no lineales en fibra óptica monomodo estándar. El análisis espectr...
Article
Full-text available
In a conjunct study with the Whale Heart Satellite Tracking (WHST) directed by Dr. Jorge Reynolds Pombo in Colombia, the study of the behavior and description of the whale's heart in a non-invasive way from the electrical point of view is posed. The objective of this work is to realize the processing, characterization and analysis of the different...
Article
Full-text available
En un trabajo conjunto con el grupo de investigación Seguimiento Corazón Vía Satélite (SCVS), dirigido por el Dr. Jorge Reynolds Pombo en Colombia, se plantea el estudio del comportamiento y descripción del corazón de la ballena de forma no invasiva, desde el punto de vista eléctrico. El objetivo de este trabajo es realizar el procesamiento, caract...
Article
Full-text available
An analysis of the axial resolution of a chromatic dispersion confocal microscopy is presented. The system is based on the principle of focus multiplexing by wavelength encoding due to a phase Fresnel lens. The axial resolution is related with the measure of the FWHM value of every spectral response.
Article
The interferometric techniques of lateral shearing and white light scanning interferometry are combined to determine the variations of thickness of phase objects and the thickness of such objects is approximated through B-splines functions.
Article
In a quantitative research study, the concentration and circulation of group of micro-organisms "phytoplankton" have been found through the images of the ocean color in the Colombian Caribbean Sea. These images have been observed through the Sea Star satellite. The method logical procedure was to collect a number of ocean images at the 1A level of...
Article
Full-text available
The chromatic confocal method to measure the refractive index and thickness of membranes is developed. The method is based on the longitudinal chromatic aberration produced by a diffractive element. The identification of the maximal spectral components coming from the membranes are used for measuring its thickness or its refractive index.
Article
C.I.E. chromaticity diagram has been used as a mean that permits to associate standard visual color perception with several interesting physics quantities: Temperature, characterization of lighting sources, thickness of thin films, and the amount of material in alloys and paintings. In specific, who works in interferencial microscopy knows the rela...
Article
In this paper a confocal profilometer using longitudinal chromatic aberration is presented. The system uses a novel polychromatic illumination source generated by means of non-linear effects in a standard single-mode optical fibre. A wavelength?height codification is realized using the chromatic aberration of a Fresnel lens. The height decoding is...
Article
In a quantitative research study, the concentration and circulation of group of micro-organisms "phytoplankton" have been found trough the images of the ocean colour in the Colombian Caribbean Sea. These images have been observed trough the Sea Star satellite. The method logical procedure was to collect a number of ocean images at the 1A level of t...
Article
In this paper a dynamic method of analysis of the reflectance is presented starting form a polychromatic interferometric system that allows establishing the conte of materials to microscopic scale. The reflectance of the material is obtained starting from the distribution of intensities in the optical contact of an interferometric microscopic, wher...
Conference Paper
Full-text available
Presents a prototype of a virtual shared environment in which several users can interact inside a three dimensional scene. Actions of a user are visible to others thanks to a protocol of transmission parameters of the scene. The communications are managed under a protocol of distributed objects, the visualization as well as the user interface use m...
Article
This communication introduces the Optics and Signal Processing Group from Universidad Industrial de Santander at Bucaramanga, Colombia. First, a brief description of how the group was formed, its strategic importance and also some of its more important achievements are presented. Then, the main scientific domains where the group carries out its res...
Article
This paper presents a digital implementation of an out-of- plane target location system by means of a joint transform correlator (JTC). A sequence of images of the 3D scene is coded into a single performing an integration of each frame in the vertical sense. The coded sequence is used as the input plane of the JTC after binarization, Fourier transf...
Article
This paper proposes a white-light phase-shifting method for interferometry, in which the absolute phase of each point is measured individually. During the axial scanning of the sample, eight phase-shifted intensities are recorded, while the fringe visibility is maximum. A seven-point algorithm, which compensates for the variation in the fringe visi...
Article
Full-text available
Resumen En la actualidad existen diversos sistemas ópticos para el análisis de superficies a partir de reconstrucciones 3D del objeto. Las técnicas intereferométricas ofrecen resoluciones axiales adecuadas para el análisis de objetos de algunas micras de altura. La interferometría con luz monocromática presenta inconvenientes en objetos que poseen...
Article
Full-text available
En éste documento se estudió la recuperación topográfica de una muestra microscópica por el método de Estéreo Visión. Con el fin de obtener los puntos correspondientes, se utilizó una robusta técnica de correlación. Dicha técnica hace uso del denominado coeficiente de correlación junto con un procedimiento de relajación. La relajación resuelve en p...

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