Producción Intelectual:

Artículos

2017

Induction hardening treatment and simulation for a grey cast iron used in engine cylinder liners

In this research, a technical study of induction hardening in a grey cast iron used in engine cylinder liners manufactured by LAVCO Ltda., a Colombian foundry company, was carried out. Metallurgical parameters such as austenitization temperature, cooling rate, and quenching sever...


Autor(es): David Alejandro Miranda.   E L Castellanos-Leal.   A E Coy.   J G Barrero.   J A González.   O P Vesga Rueda.  



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2017

Conceptual density functional theory for electron transfer and transport in mesoscopic systems

Molecular and supramolecular systems are essentially mesoscopic in character. The electron self-exchange, in the case of energy fluctuations, or electron transfer/transport, in the case of the presence of an externally driven electrochemical potential, between mesoscopic sites is...


Autor(es): David Alejandro Miranda.   Paulo R. Bueno.  



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2017

Caracterización y evaluación de la templabilidad de una fundición gris empleada en la fabricación de camisas de cilindro para motores diésel

El aumento de las propiedades mecánicas (dureza superficial) de las camisas de cilindro es uno de los objetivos de las empresas de fundición especializadas, en miras de aumentar la competitividad de sus productos en el mercado local y extranjero. El objetivo de este estudio se ce...


Autor(es): David Alejandro Miranda.   Edgar L. Castellanos-Leal.   Ana E. Coy.   Jaime A. González.   Olga P. Vesga Rueda.  



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2017

Laboratory preparation questionnaires as a tool for the implementation of the Just in Time Teaching in the Physics I laboratories: Research training

The implementation of the JiTT (Just in Time Teaching) strategy is presented to increase the previous preparation of students enrolled in the subject Physics Laboratory I offered at the Industrial University of Santander (UIS), Colombia. In this study, a laboratory preparation qu...


Autor(es): David Alejandro Miranda.   Oscar M. Forero.   Melba J. Sanchez.  



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2017

Ion hydration effects in the optical absorption and molecular vibration of water

Hydration occurs when some ionic species are in pure water. In this research study, optical properties of an electrolytic solution with ionic species that emulated the extracellular environment were analyzed. The attenuated total reflection ATR-FTIR spectra and Raman spectra of e...


Autor(es): David Alejandro Miranda.   Janeth Fernandez.   Sandra Milena Pinto.   Eduard Moreno.  



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2017

The Colon Revisited or The Key To Wellness, Health And Disease

The hypothesis being advanced in this paper is that there is a new medical paradigm emerging from the biomedical research carried out in this century, mainly due to the explosion of the so called ?omics? and associated techniques. The main idea is that there is a common pathway f...


Autor(es): David Alejandro Miranda.   C.A.Gonzalez-Correa.   E.Mulett-Vásquez.   C.H.Gonzalez-Correa.   P.A.Gómez-Buitrago.  



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2016

Considerations on electrical impedance measurements of electrolyte solutions in a four-electrode cell

A tetrapolar probe to measure the electrical properties of electrolyte solutions was implemented with gold electrodes according to the van der Pauw method. Electrical impedance spectroscopy (EIS) measurements of different concentrations of phosphate buffer saline (PBS) solution a...


Autor(es): David Alejandro Miranda.   Angel Manuel Melendez.   L. V. Herrera.   C. V. Chaparro.  



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2016

Density functional theory and an experimentally-designed energy functional of electron density

We herein demonstrate that capacitance spectroscopy (CS) experimentally allows access to the energy associated with the quantum mechanical ground state of many-electron systems. Priorly, electrochemical capacitance, C?[?], was previously understood from conceptual and computation...


Autor(es): David Alejandro Miranda.   Paulo R. Bueno.  



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2016

Could field cancerization be interpreted as a biochemical anomaly amplification due to transformed cells?

Field cancerization is a concept used to explain cellular and molecular alterations in tissue associated to neoplasia and cancer. This effect was proposed by Slaughter in order to explain the development of multiple primary tumors and locally recurrent cancer. The particular chan...


Autor(es): David Alejandro Miranda.   Janeth Fernandez.   Stelia C. Méndez-Sánchez.   C.A. Gonzalez-Correa.  



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2016

Electrochemical preparation and structural characterization of CuGaSe2 thin films

CuGaSe2 thin films have been synthesized by one-step electrodeposition on titanium and SnO2/glass substrates from aqueous solutions that contain thiocyanate ion as a complexing agent. According to composition, and morphology analysis at deposition potential of -0.55V vs SCE (Stan...


Autor(es): David Alejandro Miranda.   L Manfredy.   O P Marquez.   S A Lopez-Rivera.   J Marquez.   Y Martínez.  



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2016

Electronic properties of Hg1-xCdxSe lens-shaped quantum dots under external fields

Hg1-xCdxSe are II-VI semiconductors alloys with optoelectronic properties that depend upon the molar fraction x, which can be further controlled by nanostructuring. In this work one electron confined in a zero-dimensional lens-shaped nanostructure of Hg1-xCdxSe surrounded by a ma...


Autor(es): David Alejandro Miranda.   J R Herrera.   W Gutierrez.  



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2016

Electrical Properties of Normal Cervical Human Cells in Suspension: The Relation between Normal Tissue and Electrical Impedance Spectrum

Epidemiological studies have shown that cervical cancer is a public health problem in several countries. Early detection of cervical cancer contributes with a better prognos- tic to the patient. Traditionally, Pap test has been used to screening cervical cancer and its early dete...


Autor(es): David Alejandro Miranda.   Lyda V. Herrera.   C. Chaparro.   Sandra P. Corzo.   Sandra M. Pinto.   G. Yáñez.   Maryen Torres-Mejia.   S. C. Méndez-Sanchez.  



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2016

Electrolytic Extracellular Phantom to Study the Low-Frequency Conductivity of Cervical Neoplasia

In this work we performed an electrolytic phan- tom based on an extracellular media containing different ionic species simulating extracellular electrical conductivities to study different cervical neoplastic stage which have been re- ported in the literature (1). An aqueous elec...


Autor(es): David Alejandro Miranda.   Sandra M. Pinto.   Sandra P. Corzo.   Stelia C. Méndez-Sanchez.  



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2016

Correlation between Algometry and Electrical Bioimpedance in Subjects with and without Fibromyalgia

Fibromyalgia (FM) is a condition characterized by chronic widespread pain and generalized tenderness, accompanied by fatigue, sleep disturbances and cognitive difficulties. The diagnosis is merely clinical, as no confirmatory objective method is available so far. Several types of...


Autor(es): David Alejandro Miranda.   E. Colina-Gallo.   C. A. González-Correa.  



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2016

In Vitro Luminal Measurements of Colon Electrical Impedance in Rabbits

Until very recently, the colon was a neglected organ in science. During the present century, it has gained much attention, due to its role in health and disease, especially because of the presence of the microbiota. The interaction between the latter and human cells is made basic...


Autor(es): David Alejandro Miranda.   Edelberto Mulett-Vásquez.   Amilbia Correa-Flórez.   Cármen Dussán-Lubert.   Carlos-Augusto González-Correa.  



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2016

Segmental Electrical Bioimpedance Measurements with a Single Lead (Electrode) Displacement

Segmental Bioelectrical Impedance Analysis (SBIA) has been proposed as an alternative to overcome some limitations of total BIA measurements for the calculations of body composition. It also has been used in different clinical conditions such as ascites, edema, neuromuscular dama...


Autor(es): David Alejandro Miranda.   E. Colina-Gallo.   C. A. González-Correa.   C. Dussán-Lubert.  



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2016

Miografía por impedancia eléctrica

La miografía por impedancia eléctrica es una técnica novedosa, rápida, fácil de usar, no invasiva e indolora y que permite obtener información sobre la estructura tisular, que no es posible obtener utilizando otras técnicas de electrodiagnóstico. Si bien, aún se trata de una técn...


Autor(es): David Alejandro Miranda.   Evelyn Colina Gallo.   Carlos Augusto González Correa.  



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2016

P-226Rectal Bioelectrical impedance (REBI) as a possible screening tool for colorectal cancer (CRC)

There are two main methods widely used for CRC screening: Fecal occult blood tests (FOBT) and total colonoscopy (TC). Although not very expensive, the former lacks of good sensitivity and specificity, whereas the latter is expensive and not very well accepted by the general publi...


Autor(es): David Alejandro Miranda.   C. Gonzalez-Correa.   E. Mulett-Vasquez.   M. Osorio-Chica .   C. Dussan-Lubert.  



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2015

Electrosynthesis and characterization of Hg(1-x)Cd(x)Se films

An electrodeposition process from an aqueous bath of CdSO4, SeO2 and Hg2Cl2 at pH 2.3 was performed to synthesize two Hg1-xCdxSe alloys with x ? 0.8 onto TiO2. In order to establish an intimate contact between Hg1-xCdxSe and the TiO2 substrate, electrodeposition of Hg1-xCdxSe fil...


Autor(es): David Alejandro Miranda.   Angel Manuel Melendez.   F A González-Camacho.   M Sánchez.  



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2015

Monitoring steel microbiologically induced corrosion using a new electrochemical cell

A new test electrochemical cell is described for monitoring the steel microbiologically induced corrosion and numerical simulations were performed using finite element method to demonstrate the suitability of the device. Carbon steel concentric ring-monitoring electrochemical cel...


Autor(es): David Alejandro Miranda.   S. Fajardo.   S. A. Jaimes.   J. M. Bastidas.  



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2014

Assessment of carbon steel microbiologically induced corrosion by electrical impedance spectroscopy

A methodology to analyse electrochemical impedance spectroscopy (EIS) data for the study of microbiologically induced corrosion is proposed. The proposed methodology is based on the loss tangent behaviour of EIS spectra for sterile and bacteria-inoculated environments. Loss tange...


Autor(es): David Alejandro Miranda.   S. A. Jaimes.   J. M. Bastidas.  



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2014

Design, assembly and calibration of an optoelectronic device that measures three wavelengths in the near infrared for breast cancer early detection

Early detection of cancer is an important subject to improve patient"s prognostic. Now breast cancer is one of more frequent cause of death in women around the world and new technologies to its early detection are being studied, e.g. optical properties of breast tissue. To contri...


Autor(es): David Alejandro Miranda.   Karen Lorena Cristiano.   Daniel Andres Triana.  



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2013

Phonons in Hg(1-x)Cd(x)Se crystalline alloys

Phonons vibrational frequencies for Hg1-xCdxSeHg1-xCdxSe (x - 0.5) crystalline alloys were theoretical and experimentally studied. Two simple expressions that summarize the optical modes behavior with composition were derived. Such that the behavior of the vibrational propertie...


Autor(es): David Alejandro Miranda.   S. A. López R..   A. H. Romero.  



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2013

Cervical cancer detection by electrical impedance in a Colombian setting

Electrical properties of normal and neoplastic cervical tissues in a heterogeneous group of 56 Colombian women were studied by electrical impedance spectroscopy and a model based on the Generalized Effective-Medium Theory of Induced Polarization (GEMTIP). Differences between the ...


Autor(es): David Alejandro Miranda.   Sandra Patricia Corzo.   C A González Correa.  



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2013

Breast phantom for mammary tissue characterization by near infrared spectroscopy

Breast cancer is a disease associated to a high morbidity and mortality in the entire world. In the study of early detection of breast cancer the development of phantom is so important. In this research we fabricate a breast phantom using a ballistic gel with special modification...


Autor(es): David Alejandro Miranda.   Karen Lorena Cristiano.   J C Gutiérrez.  



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2012

Phonons and Crystalline Structure of Hg 1- x Cd x S e Alloys (0< x- 0.5)

Phonons and crystalline structures of Hg1?xCdxSe alloys (0 ? x ? 0.5) were studied by Raman spectroscopy and X-ray powder diffraction patterns at 298K. The crystalline alloys were prepared by a special combination of synthesis and the Bridgman method. Experimental data showed a...


Autor(es): David Alejandro Miranda.   S. A. López-Rivera.   Ch. Power.   J. A. Henao.  



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2012

Early detection of cervical intraepitelial neoplasia in a heterogeneos group of colombian women using electrical impedance spectroscopy and the Miranda-López algorithm

Electrical Impedance Spectroscopy (EIS) allows the study of the electrical properties of materials and structures such as biological tissues. EIS can be used as a diagnostic tool for the identification of pathological conditions such as cervical cancer. We used EIS in combination...


Autor(es): David Alejandro Miranda.   Sandra Patricia Corzo.   Carlos-A González-Correa.  



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2012

Citología de cuello uterino e impeditividad eléctrica en la detección temprana del cáncer cervical

Se reportan los resultados de un estudio piloto de las propiedades eléctricas del tejido epitelial de cuello uterino por medio de espectroscopia de impeditividad eléctrica, con el propósito de estudiar la detección temprana de la neoplasia intraepitelial con éste método. Para ell...


Autor(es): David Alejandro Miranda.   Sandra Patricia Corzo.   Ernesto Garcia.   Yolima Estupiñan.   Carlos-A. González-C.  



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2011

Photoluminescence, Photoreflectance and Optical Absorption of Hg 0.5 Cd 0.5 Se

Radiative recombination spectra of Hg0.5Cd0.5Se in the temperature range 11?110 K at different excitation power were investigated. A blue shift in the photoluminescence spectra that exposes the peculiarities of the electronic band structure of these alloys was observed. This phen...


Autor(es): David Alejandro Miranda.   S. A. López?Rivera.   J. J. Prías?Barragan.   M. de los Ríos.  



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2011

Efecto de la distribución superficial de potencial eléctrico en GaAs, debida a un potencial eléctrico externo, sobre imágenes de electrones secundarios en microscopía electrónica de barrido

Se estudió el efecto sobre las imágenes de electrones secundarios, retrodispersados y EDS debidos a la aplicación de un potencial eléctrico externo sobre una muestra semiconductora de GaAs. La distribución de potencial sobre la muestra fue modelada por elementos finitos, encontrá...


Autor(es): David Alejandro Miranda.   S. A. López-Rivera.   A. E. Mora.  



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2010

Impeditividad eléctrica en la detección temprana del cáncer cervical

La espectroscopia de impeditividad eléctrica (EIE) es una técnica que permite estudiar las propiedades eléctricas de los materiales, como por ejemplo, el tejido humano. El objetivo de esta investigación fue comparar la EIE con la histopatología de cérvix y determinar la capacidad...


Autor(es): David Alejandro Miranda.   Elga Johanna Vargas Carreño.   Carlos Javier Zamora Rangel.  



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2009

Modelado del comportamiento de ratas en laberinto en cruz elevado basado en redes neuronales artificiales

El estudio del comportamiento de una rata de laboratorio en el laberinto en cruz elevado (LCE) es empleado en la comprensión de algunos estados anímicos y en pruebas de medicamentos ansiolíticos y ansiogénicos. Algunos autores sugieren que el modelado computacional de una rata de...


Autor(es): David Alejandro Miranda.   Sandra Patricia Corzo.   C. A. Conde.   C. C. Celis.  



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2008

Determination of Cole-Cole parameters using only the real part of electrical impedivity measurements

An algorithm is presented to determine the Cole-Cole parameters of electrical impedivity using only measurements of its real part. The algorithm is based on two multi-fold direct inversion methods for the Cole-Cole and Debye equations, respectively, and a genetic algorithm for ...


Autor(es): David Alejandro Miranda.   S- A López Rivera.  



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2008

Algoritmo para la Inversión del Modelo de Cole-Cole a partir de la Parte Real del Espectro de Impedancia Eléctrica

It is presented the partials results of an early uterine cancer detection based on electrical impedance spectrum. It was developed a new algorithm to the inversion of the Cole-Cole model using only the real part of the electrical impedance spectrum. The new algorithm is based in ...


Autor(es): David Alejandro Miranda.   J. G. Barrero.  



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2008

Diseño de un medidor de conductividad electrolítica, para operar en el rango de conductividad eléctrica del tejido humano

A Van der Pauw electrolytic conductivimeter was development to calibrate an electrical resistivity probe. This conductivimeter is used in studies of early cancer screening because such studies require a measurement probe, i.e., tetra-polar probe, which needs to be calibrated. The...


Autor(es): David Alejandro Miranda.   Samuel Alberto Jaimes.   Juan Pablo Valencia Quintero.  



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2007

Criterios de diseño de la fuente de corriente Howland

Se presenta el análisis teórico de la fuente de corriente Howland con el fin de suministrar un criterio para la selección de los componentes pasivos y activos que la conforman. La metodología de estudio de la fuente de corriente Howland se hace en cuatro partes, primero se analiz...


Autor(es): David Alejandro Miranda.   OSCAR ADOLFO AGUILERA ORTIZ.   OSCAR JAVIER BAYONA VERGARA.  



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2007

Teoría, método, análisis de Fourier y error del muestreo por desfase

Se presenta una nueva teoría de muestreo para señales periódicas y aperiódicas de duración finita, y se postula y demuestra el teorema de muestreo por desfase y el teorema de muestreo por desfase generalizado. Además, se presenta la técnica de muestreo por desfase, su análisis d...


Autor(es): David Alejandro Miranda.   JAIME GUILLERMO BARRERO PÉREZ.  



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2006

Estudio piloto de detección temprana de cáncer de cuello uterino basado en espectroscopia de impedancia eléctrica

Se presentan los resultados de un estudio piloto de detección temprana de cáncer de cuello uterino basado en la mediciónde las propiedades eléctricas del tejido epitelial de cérvix. El objetivo de esta investigación fue estudiar parámetros delespectro de impedancia eléctrica corr...


Autor(es): David Alejandro Miranda.   JORGE HUMBERTO ECHEVERRI PERICO.   JAIME GUILLERMO BARRERO PEREZ.  



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2006

Zona de incidencia de una sonda tetrapolar para la espectroscopia de impedancia eléctrica en tejido humano In-Vivo

Se presentan los resultados parciales de un estudio de detección temprana de cáncer de cuello uterino basado en espectroscopía de impedancia eléctrica. En el presente artículo se analiza el área de incidencia de la sonda utilizada para la medición de la bioimpedancia eléctrica e...


Autor(es): David Alejandro Miranda.   JAIME GUILLERMO BARRERO PEREZ.  



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