En esta era de co-evolucion de los seres humanos y las computadoras estamos presenciando mucho miedo de que la humanidad pierda el control y la autonomia. Esta es una posibilidad. Otro es el desarrollo de sistemas simbioticos entre el hombre y las maquinas. Para lograr este objetivo es necesario investigar formas de aplicar algunos conceptos clave capaces de tener un efecto catalizador sobre tales ideas. Al discutir esta posibilidad a traves del estudio de caso del espectaculo MindFluctuations, una obra experimental que explora las conexiones neuronales, estamos buscando formas de desarrollarlas discutiendo este caso particular desde su concepcion hasta su realizacion. Tambien establece un proceso de reflexion sobre el diseno, desarrollo y produccion de este espectaculo de danza. Esta obra de arte utiliza una aplicacion personalizada, NumericVariations, para explorar las conexiones neuronales citadas para espectaculos, actuaciones e instalaciones especificas del sitio. Su enfoque fue posible gracias a la reciente investigacion en neurociencia y al desarrollo de una Interfaz de Computadora Cerebral (BCI) integrada con un marco de realidad virtual, que permitio que surgiera una obra experimental de realidad virtual interactiva. Un casco neuronal, conectado a la computadora y entrelazado con procedimientos matematicos, propicio una simbiosis de seres humanos con computadoras
{"title":"MindFluctuations: Poetic, Aesthetic and Technical Considerations of a Dance Spectacle Exploring Neural Connections","authors":"Tania Fraga","doi":"10.22430/22565337.728","DOIUrl":"https://doi.org/10.22430/22565337.728","url":null,"abstract":"En esta era de co-evolucion de los seres humanos y las computadoras estamos presenciando mucho miedo de que la humanidad pierda el control y la autonomia. Esta es una posibilidad. Otro es el desarrollo de sistemas simbioticos entre el hombre y las maquinas. Para lograr este objetivo es necesario investigar formas de aplicar algunos conceptos clave capaces de tener un efecto catalizador sobre tales ideas. Al discutir esta posibilidad a traves del estudio de caso del espectaculo MindFluctuations, una obra experimental que explora las conexiones neuronales, estamos buscando formas de desarrollarlas discutiendo este caso particular desde su concepcion hasta su realizacion. Tambien establece un proceso de reflexion sobre el diseno, desarrollo y produccion de este espectaculo de danza. Esta obra de arte utiliza una aplicacion personalizada, NumericVariations, para explorar las conexiones neuronales citadas para espectaculos, actuaciones e instalaciones especificas del sitio. Su enfoque fue posible gracias a la reciente investigacion en neurociencia y al desarrollo de una Interfaz de Computadora Cerebral (BCI) integrada con un marco de realidad virtual, que permitio que surgiera una obra experimental de realidad virtual interactiva. Un casco neuronal, conectado a la computadora y entrelazado con procedimientos matematicos, propicio una simbiosis de seres humanos con computadoras","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"21 1","pages":"81-102"},"PeriodicalIF":0.0,"publicationDate":"2018-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45378243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Interdisciplinary work is necessary to respond to the challenges of the current society. For instance, the partnership between technology, humanities and arts, had allowed the contemporary development of interactive systems. An example is the fact that producing a smartphone involves graphic designers, psychologists, illustrators, sociologists, and other professionals, including engineers. One might say the same about the development of video games, laptops, movies and computer mice. In summary, behind of the creation of any "technological artifact" there is hard interdisciplinary work.
{"title":"Art, science and technology, brief reflections on interdisciplinary work","authors":"Wilson J. Sarmiento, Santiago Mesa-Romero","doi":"10.22430/22565337.742","DOIUrl":"https://doi.org/10.22430/22565337.742","url":null,"abstract":"Interdisciplinary work is necessary to respond to the challenges of the current society. For instance, the partnership between technology, humanities and arts, had allowed the contemporary development of interactive systems. An example is the fact that producing a smartphone involves graphic designers, psychologists, illustrators, sociologists, and other professionals, including engineers. One might say the same about the development of video games, laptops, movies and computer mice. In summary, behind of the creation of any \"technological artifact\" there is hard interdisciplinary work.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"21 1","pages":"9-11"},"PeriodicalIF":0.0,"publicationDate":"2018-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47275245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Peña-Rodríguez, Paola A. Rivera-Suárez, César H. González-Gómez, C. A. Parra-Vargas, A. O. Garzón-Posada, David A. Landínez-Téllez, J. Roa-Rojas
This study reports the effect of the concentration of magnetite powders (Fe3O4) on the electrical and magnetic properties of a resin-based composite of thermoset polyester. The samples were prepared by the casting method at different concentrations: 60-40, 70-30, 80-20, 90-10 and 100-0 (% in weight), where the primary phase was resin and the secondary, Fe3O4 powders. The crystalline structure was studied using X-ray diffraction and surface characterization was carried out applying the scanning electron microscopy technique. The electrical response was measured by electric polarization curves as a function of the electric field; and the volumetric electrical resistivity, by an electrometer. The magnetic response was determined by magnetization curves as a function of temperature and intensity of the applied magnetic field. The structural analysis indicates that crystallinity increases as higher concentrations of Fe3O4 are added to the samples. The electrical characterization of the material reveals that the volumetric resistivity decreases as the content of magnetite increases. These reactions indicate an insulation-conductor transition with increasing dielectric constant values. The magnetic characterization presents a linear increase of the saturation of magnetization and magnetic moment as a function of the amount of magnetite added to the polymer matrix, whereas the coercivity shows behaviors of soft magnetic materials for T ˃ Tv and for T < Tv, where Tv represents the temperature of Verwey.
{"title":"Efecto de la concentración de magnetita en la estructura, propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster","authors":"G. Peña-Rodríguez, Paola A. Rivera-Suárez, César H. González-Gómez, C. A. Parra-Vargas, A. O. Garzón-Posada, David A. Landínez-Téllez, J. Roa-Rojas","doi":"10.22430/22565337.708","DOIUrl":"https://doi.org/10.22430/22565337.708","url":null,"abstract":"This study reports the effect of the concentration of magnetite powders (Fe3O4) on the electrical and magnetic properties of a resin-based composite of thermoset polyester. The samples were prepared by the casting method at different concentrations: 60-40, 70-30, 80-20, 90-10 and 100-0 (% in weight), where the primary phase was resin and the secondary, Fe3O4 powders. The crystalline structure was studied using X-ray diffraction and surface characterization was carried out applying the scanning electron microscopy technique. The electrical response was measured by electric polarization curves as a function of the electric field; and the volumetric electrical resistivity, by an electrometer. The magnetic response was determined by magnetization curves as a function of temperature and intensity of the applied magnetic field. The structural analysis indicates that crystallinity increases as higher concentrations of Fe3O4 are added to the samples. The electrical characterization of the material reveals that the volumetric resistivity decreases as the content of magnetite increases. These reactions indicate an insulation-conductor transition with increasing dielectric constant values. The magnetic characterization presents a linear increase of the saturation of magnetization and magnetic moment as a function of the amount of magnetite added to the polymer matrix, whereas the coercivity shows behaviors of soft magnetic materials for T ˃ Tv and for T < Tv, where Tv represents the temperature of Verwey.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"21 1","pages":"13-27"},"PeriodicalIF":0.0,"publicationDate":"2018-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48447589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mónica Rodríguez-Calvache, Andrés Quintero-Zea, Sandra P. Trujillo-Orrego, N. Trujillo-Orrego, José David López-Hincapié
The reincorporation process of Colombian ex-combatants is hindered by their chronic exposure to violence, which affects their Emotional Processing (EP). Characterizing their EP will contribute to their reinsertion. The objective of this work is to define an EEG-based brain connectivity approach to identify differences in EP between Colombian ex-combatants and individuals who were not directly exposed to the armed conflict. The proposed approach involves defining the Regions of Interest (ROI) and selecting one of five commonly used brain connectivity metrics: Correlation, Cross-Correlation, Coherence, Imaginary part of Coherency, and Phase-Lag Index. Significant differences were found in the positive valence stimuli in the Beta frequency band. These results support the previously reported trend in the literature regarding the difficulties ex-combatants have to process emotional information with positive valence.
{"title":"Detecting atypical functioning of emotional processing in Colombian ex-combatants","authors":"Mónica Rodríguez-Calvache, Andrés Quintero-Zea, Sandra P. Trujillo-Orrego, N. Trujillo-Orrego, José David López-Hincapié","doi":"10.22430/22565337.710","DOIUrl":"https://doi.org/10.22430/22565337.710","url":null,"abstract":"The reincorporation process of Colombian ex-combatants is hindered by their chronic exposure to violence, which affects their Emotional Processing (EP). Characterizing their EP will contribute to their reinsertion. The objective of this work is to define an EEG-based brain connectivity approach to identify differences in EP between Colombian ex-combatants and individuals who were not directly exposed to the armed conflict. The proposed approach involves defining the Regions of Interest (ROI) and selecting one of five commonly used brain connectivity metrics: Correlation, Cross-Correlation, Coherence, Imaginary part of Coherency, and Phase-Lag Index. Significant differences were found in the positive valence stimuli in the Beta frequency band. These results support the previously reported trend in the literature regarding the difficulties ex-combatants have to process emotional information with positive valence.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"20 1","pages":"83-96"},"PeriodicalIF":0.0,"publicationDate":"2017-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48399673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Diana C. Pachajoa, C. Tobón, J. P. Ugarte, J. Saiz
Exposure to air pollutants like carbon monoxide (CO), lead (Pb++) and sulfur dioxide (SO2) promotes the occurrence of cardiovascular diseases. Experimental studies have shown that CO, Pb++ and SO2 block L-type calcium channels, reducing the calcium current (ICaL) and the action potential duration (APD), which favors the initiation of atrial arrhythmias. The goal is to study the effects of CO, Pb++ and SO2 at different concentrations on ICaL and action potential using computational simulation. For this purpose, models of the effects of the air pollutants on the atrial L-type calcium channel were developed and were incorporated into a mathematical model of a human atrial cell. The results suggest that CO, Pb++ and SO2 block the ICaL current in a fraction that increases along with the concentration, generating an APD shortening. These results are consistent with experimental studies. The combined effect of the three air pollutants produced an APD shortening, which is considered to be a pro-arrhythmic effect.
{"title":"CO, Pb ++ and SO2 effects on L-type calcium channel and action potential in human atrial myocytes. In silico study","authors":"Diana C. Pachajoa, C. Tobón, J. P. Ugarte, J. Saiz","doi":"10.22430/22565337.718","DOIUrl":"https://doi.org/10.22430/22565337.718","url":null,"abstract":"Exposure to air pollutants like carbon monoxide (CO), lead (Pb++) and sulfur dioxide (SO2) promotes the occurrence of cardiovascular diseases. Experimental studies have shown that CO, Pb++ and SO2 block L-type calcium channels, reducing the calcium current (ICaL) and the action potential duration (APD), which favors the initiation of atrial arrhythmias. The goal is to study the effects of CO, Pb++ and SO2 at different concentrations on ICaL and action potential using computational simulation. For this purpose, models of the effects of the air pollutants on the atrial L-type calcium channel were developed and were incorporated into a mathematical model of a human atrial cell. The results suggest that CO, Pb++ and SO2 block the ICaL current in a fraction that increases along with the concentration, generating an APD shortening. These results are consistent with experimental studies. The combined effect of the three air pollutants produced an APD shortening, which is considered to be a pro-arrhythmic effect.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"20 1","pages":"113-123"},"PeriodicalIF":0.0,"publicationDate":"2017-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44425037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Advances in biomedical engineering (BME) imply the existence of research groups working in multidisciplinary teams to understand physiological processes and develop methods and tools for diagnostics and therapeutics. Multidisciplinary teams include physicians, biologists, physicists, mathematicians and engineers from different disciplines: electrical and electronics, computer sciences, materials, mechanical, chemical, among others. Lately, BME has become a bridge joining these disciplines. Therefore, successful BME projects involve not only a deep knowledge of the specific discipline, but also an understanding of the physiological phenomena under study.
{"title":"Advances in biomedical engineering: a call for enhancing empirical research","authors":"A. Orozco-Duque, D. Novák","doi":"10.22430/22565337.741","DOIUrl":"https://doi.org/10.22430/22565337.741","url":null,"abstract":"Advances in biomedical engineering (BME) imply the existence of research groups working in multidisciplinary teams to understand physiological processes and develop methods and tools for diagnostics and therapeutics. Multidisciplinary teams include physicians, biologists, physicists, mathematicians and engineers from different disciplines: electrical and electronics, computer sciences, materials, mechanical, chemical, among others. Lately, BME has become a bridge joining these disciplines. Therefore, successful BME projects involve not only a deep knowledge of the specific discipline, but also an understanding of the physiological phenomena under study.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"20 1","pages":"9-11"},"PeriodicalIF":0.0,"publicationDate":"2017-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47617269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Karin Correa-Arana, Ó. A. Vivas-Albán, J. Sabater-Navarro
Este articulo presenta una revision acerca de la neurocirugia, los asistentes roboticos en este tipo de procedimiento, y el tratamiento que se le da al problema del desplazamiento que sufre el tejido cerebral, incluyendo las tecnicas para la obtencion de imagenes medicas. Se abarca de manera especial el fenomeno del desplazamiento cerebral, comunmente conocido como brain shift, el cual causa perdida de referencia entre las imagenes preoperatorias y los volumenes a tratar durante la cirugia guiada por imagenes medicas. Hipoteticamente, con la prediccion y correccion del brain shift sobre el sistema de neuronavegacion, se podrian planear y seguir trayectorias de minima invasion, lo que conllevaria a minimizar el dano a los tejidos funcionales y posiblemente a reducir la morbilidad y mortalidad en estos delicados y exigentes procedimientos medicos, como por ejemplo, en la extirpacion de un tumor cerebral. Se mencionan tambien otros inconvenientes asociados a la neurocirugia y se muestra como los sistemas robotizados han ayudado a solventar esta problematica. Finalmente se ponen en relieve las perspectivas futuras de esta rama de la medicina, la cual desde muchas disciplinas busca tratar las dolencias del principal organo del ser humano.
{"title":"Neurosurgery and brain shift: review of the state of the art and main contributions of robotics","authors":"Karin Correa-Arana, Ó. A. Vivas-Albán, J. Sabater-Navarro","doi":"10.22430/22565337.719","DOIUrl":"https://doi.org/10.22430/22565337.719","url":null,"abstract":"Este articulo presenta una revision acerca de la neurocirugia, los asistentes roboticos en este tipo de procedimiento, y el tratamiento que se le da al problema del desplazamiento que sufre el tejido cerebral, incluyendo las tecnicas para la obtencion de imagenes medicas. Se abarca de manera especial el fenomeno del desplazamiento cerebral, comunmente conocido como brain shift, el cual causa perdida de referencia entre las imagenes preoperatorias y los volumenes a tratar durante la cirugia guiada por imagenes medicas. Hipoteticamente, con la prediccion y correccion del brain shift sobre el sistema de neuronavegacion, se podrian planear y seguir trayectorias de minima invasion, lo que conllevaria a minimizar el dano a los tejidos funcionales y posiblemente a reducir la morbilidad y mortalidad en estos delicados y exigentes procedimientos medicos, como por ejemplo, en la extirpacion de un tumor cerebral. Se mencionan tambien otros inconvenientes asociados a la neurocirugia y se muestra como los sistemas robotizados han ayudado a solventar esta problematica. Finalmente se ponen en relieve las perspectivas futuras de esta rama de la medicina, la cual desde muchas disciplinas busca tratar las dolencias del principal organo del ser humano.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"20 1","pages":"125-138"},"PeriodicalIF":0.0,"publicationDate":"2017-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47384807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. D. Montoya-Giraldo, Walter Gil-González, Alejandro Garcés-Ruiz
This paper presents a convex formulation for optimal power flow (OPF) in both radial and meshed grids. A semidefinite programming (SDP) approximation transforms the quadratic non-convex model into a relaxed convex quadratic model, which can be more efficiently solved. This model is implemented in MATLAB using the CVX package for convex optimization. The results obtained are compared to the non-linear model of the problem implemented in GAMS and MATPOWER by using four typical systems in specialized literature (two radial and two meshed). SDP approximation demonstrated to provide accurate solutions that are close to an optimal solution of the problem in shorter computational times. Such solutions are applicable to real-time operation and control problems.
{"title":"Flujo de potencia óptimo para redes radiales y enmalladas empleando programación semidefinida","authors":"O. D. Montoya-Giraldo, Walter Gil-González, Alejandro Garcés-Ruiz","doi":"10.22430/22565337.703","DOIUrl":"https://doi.org/10.22430/22565337.703","url":null,"abstract":"This paper presents a convex formulation for optimal power flow (OPF) in both radial and meshed grids. A semidefinite programming (SDP) approximation transforms the quadratic non-convex model into a relaxed convex quadratic model, which can be more efficiently solved. This model is implemented in MATLAB using the CVX package for convex optimization. The results obtained are compared to the non-linear model of the problem implemented in GAMS and MATPOWER by using four typical systems in specialized literature (two radial and two meshed). SDP approximation demonstrated to provide accurate solutions that are close to an optimal solution of the problem in shorter computational times. Such solutions are applicable to real-time operation and control problems.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"20 1","pages":"29-42"},"PeriodicalIF":0.0,"publicationDate":"2017-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47071589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. D. Urda-Benitez, A. E. Castro-Ospina, A. Orozco-Duque
Non-linear analysis of electrograms (EGM) has been proposed as a tool to detect critical conduction sites (e.g., rotors vortex, multiple wavefronts) in atrial fibrillation (AF). Likewise, studies have shown that multifractal analysis is useful to detect critical activity in EGM signals. However, the multifractal spectrum does not consider the temporal information. There is a new mathematical formalism to overcome this limitation: the time-singularity multifractal spectrum distribution (TS-MFSD), which involves the time variation of the spectrum. In this manuscript, we describe the methodology to compute the TS-MFSD from EGM signals. Moreover, we propose a methodology to extract features from time-singularity spectrum and from singularity energy spectrum (SES). We tested the features in an EGM database labeled by experts as: non-fragmented, discrete fragmented potentials, disorganized activity, and continuous activity. We tested the area under the receiver operating characteristic (ROC) curve. The proposed features achieve an area under the ROC curve of 95.17% when detecting signals with continuous activity. These results outperform those reported using multifractal analysis. To our knowledge, this is the first work that report the use of TS-MFSD in biomedical signals and our findings suggest that time-singularity has the potential to be used in the study of non-stationary behavior of EGM signals in AF.
{"title":"Feature extraction based on time-singularity multifractal spectrum distribution in intracardiac atrial fibrillation signals","authors":"R. D. Urda-Benitez, A. E. Castro-Ospina, A. Orozco-Duque","doi":"10.22430/22565337.716","DOIUrl":"https://doi.org/10.22430/22565337.716","url":null,"abstract":"Non-linear analysis of electrograms (EGM) has been proposed as a tool to detect critical conduction sites (e.g., rotors vortex, multiple wavefronts) in atrial fibrillation (AF). Likewise, studies have shown that multifractal analysis is useful to detect critical activity in EGM signals. However, the multifractal spectrum does not consider the temporal information. There is a new mathematical formalism to overcome this limitation: the time-singularity multifractal spectrum distribution (TS-MFSD), which involves the time variation of the spectrum. In this manuscript, we describe the methodology to compute the TS-MFSD from EGM signals. Moreover, we propose a methodology to extract features from time-singularity spectrum and from singularity energy spectrum (SES). We tested the features in an EGM database labeled by experts as: non-fragmented, discrete fragmented potentials, disorganized activity, and continuous activity. We tested the area under the receiver operating characteristic (ROC) curve. The proposed features achieve an area under the ROC curve of 95.17% when detecting signals with continuous activity. These results outperform those reported using multifractal analysis. To our knowledge, this is the first work that report the use of TS-MFSD in biomedical signals and our findings suggest that time-singularity has the potential to be used in the study of non-stationary behavior of EGM signals in AF.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"20 1","pages":"97-111"},"PeriodicalIF":0.0,"publicationDate":"2017-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42057343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Olga M. Giraldo-Giraldo, Santiago Perez-Walton, Jorge M. Osorio-Guillén
espanolNb2O5 y Ta2O5 son oxidos semiconductores de brecha ancha, los cuales en los ultimos anos han despertado gran interes debido a sus multiples aplicaciones tecnologicas, ya sea en electronica, telecomunicaciones o fotocatalisis. Por estas razones, en este trabajo presentamos un estudio a partir de calculos de primeros principios de las propiedades piezoelectricas de las fases Z y β de Ta2O5, y de las fases Z y P de Nb2O5 utilizado la teoria de los funcionales de la densidad y la aproximacion del gradiente, generalizado con la parametrizacion PBEsol. Una vez determinada la geometria de equilibrio para cada una de estas fases, realizamos un calculo utilizando respuesta lineal para determinar el tensor piezoelectrico asociado a cada una de estas fases, encontrando que la fase Z para ambos compuestos presenta una buena respuesta piezoelectrica. Adicionalmente, encontramos que la fase β-Ta2O5 no presenta respuesta piezoelectrica. EnglishNb2O5 and Ta2O5 are wide-bandgap semiconductor oxides that have attracted great interest in recent years due to their technological applications, such as in electronics, telecommunications or photocatalysis. Because of this, we present a study based on first-principles calculations of the piezoelectric properties of the Z and β phases of Ta2O5 as well as the Z and P phases of Nb2O5 by using the Density Functional Theory and the Generalized Gradient Approximation with PBEsol parameterization. Once the equilibrium geometry was determined for each of these phases, we made a calculation using the linear response theory to determine the piezoelectric tensor associated with each phase. We discovered that the Z phase of both compounds presents good piezoelectric response. Additionally, β-Ta2O5 does not show such response.
{"title":"Propiedades Piezoeléctricas del Pentóxido de Niobio y Pentóxido de Tantalio: un estudio desde primeros principios","authors":"Olga M. Giraldo-Giraldo, Santiago Perez-Walton, Jorge M. Osorio-Guillén","doi":"10.22430/22565337.704","DOIUrl":"https://doi.org/10.22430/22565337.704","url":null,"abstract":"espanolNb2O5 y Ta2O5 son oxidos semiconductores de brecha ancha, los cuales en los ultimos anos han despertado gran interes debido a sus multiples aplicaciones tecnologicas, ya sea en electronica, telecomunicaciones o fotocatalisis. Por estas razones, en este trabajo presentamos un estudio a partir de calculos de primeros principios de las propiedades piezoelectricas de las fases Z y β de Ta2O5, y de las fases Z y P de Nb2O5 utilizado la teoria de los funcionales de la densidad y la aproximacion del gradiente, generalizado con la parametrizacion PBEsol. Una vez determinada la geometria de equilibrio para cada una de estas fases, realizamos un calculo utilizando respuesta lineal para determinar el tensor piezoelectrico asociado a cada una de estas fases, encontrando que la fase Z para ambos compuestos presenta una buena respuesta piezoelectrica. Adicionalmente, encontramos que la fase β-Ta2O5 no presenta respuesta piezoelectrica. EnglishNb2O5 and Ta2O5 are wide-bandgap semiconductor oxides that have attracted great interest in recent years due to their technological applications, such as in electronics, telecommunications or photocatalysis. Because of this, we present a study based on first-principles calculations of the piezoelectric properties of the Z and β phases of Ta2O5 as well as the Z and P phases of Nb2O5 by using the Density Functional Theory and the Generalized Gradient Approximation with PBEsol parameterization. Once the equilibrium geometry was determined for each of these phases, we made a calculation using the linear response theory to determine the piezoelectric tensor associated with each phase. We discovered that the Z phase of both compounds presents good piezoelectric response. Additionally, β-Ta2O5 does not show such response.","PeriodicalId":30469,"journal":{"name":"TecnoLogicas","volume":"20 1","pages":"43-51"},"PeriodicalIF":0.0,"publicationDate":"2017-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49267509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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