Daniel Espinoza - Academia.edu (original) (raw)
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Papers by Daniel Espinoza
KnE Engineering, 2018
Se cuantificaron, analizaron y compararon propiedades físicas de tres diluyentes (Shellsol, Orfom... more Se cuantificaron, analizaron y compararon propiedades físicas de tres diluyentes (Shellsol, Orfom y Escaid) utilizados en extracción por solvente de cobre y una solución sintética de lixiviación de minerales de cobre (PLS) con una concentración representativa de hierro y cobre. Las propiedades analizadas fueron densidad, viscosidad y tensión Interfacial, además se evaluó el efecto del porcentaje de extractante (porcentaje de extractante presente en la fase organica expresada en volumen/volumen) (% v/v) en la fase organica sobre la densidad y la viscosidad. Las concentraciones de cobre y hierro en el PLS fueron de 4,5 [g/L] y 5,0 [g/L] respecivamente. Las temperaturas utilizadas fueron 25, 35 y 45 °C. Los resultados obtenidos muestran que la temperatura produce un efecto similar sobre la densidad de los diluyentes y PLS, obteniéndose una tendencia semejante en las curvas con leves variaciones; por su parte el efecto de la temperatura sobre la viscosidad presenta las mayores diferenc...
Discrete Applied Mathematics, 2015
Lecture Notes in Computer Science, 2005
2012 IEEE Ninth Electronics, Robotics and Automotive Mechanics Conference, 2012
ABSTRACT The current trends in wearable sensor technology suggest that, in the next decade or so,... more ABSTRACT The current trends in wearable sensor technology suggest that, in the next decade or so, garments will commonly include some form of biometric/biopotential measurement system and will be of great value for gathering ambulatory metadata for remote diagnosis. In parallel, the introduction of new powerful mixed-signal devices will enhance the possibility of garments including cost-effective biopotential measurements, over the classical analog signal conditioning configurations. This paper presents the use of a recently introduced ASIC device (ADS1298) for measuring ECG, EEG and EMG data, towards developing a multimodal biopotential measurement system. Two programmable analog filter configurations are tested for comparison. The results show that adjusting the analog filters to accommodate different biopotentials is an unfeasible task in comparison with the ASIC device, which proved useful for measuring common biopotentials: ECG, EMG and EEG, and thus is more suitable for wearable sensor applications.
Operations Research Letters, 2007
Minimally Invasive Therapy & Allied Technologies, 2011
It is widely documented that laparoscopic surgeons require training, and an objective evaluation ... more It is widely documented that laparoscopic surgeons require training, and an objective evaluation of the training that they receive. The most advanced evaluation systems integrate the digitization of the movement of laparoscopic tools. A great number of these systems, however, do not permit the use of real tools and their high cost limits their academic impact. Likewise, it is documented that new and accessible systems need to be developed. The aim of this article is to explore the possibility of digitizing the movement of laparoscopic tools in a three-dimensional workspace, using accessible alternative technology. Our proposal uses a commercial Wii video game control in conjunction with a program for determining kinematic variables during the execution of a recognition task.
Journal of Hand Surgery (European Volume), 2010
KnE Engineering, 2018
Se cuantificaron, analizaron y compararon propiedades físicas de tres diluyentes (Shellsol, Orfom... more Se cuantificaron, analizaron y compararon propiedades físicas de tres diluyentes (Shellsol, Orfom y Escaid) utilizados en extracción por solvente de cobre y una solución sintética de lixiviación de minerales de cobre (PLS) con una concentración representativa de hierro y cobre. Las propiedades analizadas fueron densidad, viscosidad y tensión Interfacial, además se evaluó el efecto del porcentaje de extractante (porcentaje de extractante presente en la fase organica expresada en volumen/volumen) (% v/v) en la fase organica sobre la densidad y la viscosidad. Las concentraciones de cobre y hierro en el PLS fueron de 4,5 [g/L] y 5,0 [g/L] respecivamente. Las temperaturas utilizadas fueron 25, 35 y 45 °C. Los resultados obtenidos muestran que la temperatura produce un efecto similar sobre la densidad de los diluyentes y PLS, obteniéndose una tendencia semejante en las curvas con leves variaciones; por su parte el efecto de la temperatura sobre la viscosidad presenta las mayores diferenc...
Discrete Applied Mathematics, 2015
Lecture Notes in Computer Science, 2005
2012 IEEE Ninth Electronics, Robotics and Automotive Mechanics Conference, 2012
ABSTRACT The current trends in wearable sensor technology suggest that, in the next decade or so,... more ABSTRACT The current trends in wearable sensor technology suggest that, in the next decade or so, garments will commonly include some form of biometric/biopotential measurement system and will be of great value for gathering ambulatory metadata for remote diagnosis. In parallel, the introduction of new powerful mixed-signal devices will enhance the possibility of garments including cost-effective biopotential measurements, over the classical analog signal conditioning configurations. This paper presents the use of a recently introduced ASIC device (ADS1298) for measuring ECG, EEG and EMG data, towards developing a multimodal biopotential measurement system. Two programmable analog filter configurations are tested for comparison. The results show that adjusting the analog filters to accommodate different biopotentials is an unfeasible task in comparison with the ASIC device, which proved useful for measuring common biopotentials: ECG, EMG and EEG, and thus is more suitable for wearable sensor applications.
Operations Research Letters, 2007
Minimally Invasive Therapy & Allied Technologies, 2011
It is widely documented that laparoscopic surgeons require training, and an objective evaluation ... more It is widely documented that laparoscopic surgeons require training, and an objective evaluation of the training that they receive. The most advanced evaluation systems integrate the digitization of the movement of laparoscopic tools. A great number of these systems, however, do not permit the use of real tools and their high cost limits their academic impact. Likewise, it is documented that new and accessible systems need to be developed. The aim of this article is to explore the possibility of digitizing the movement of laparoscopic tools in a three-dimensional workspace, using accessible alternative technology. Our proposal uses a commercial Wii video game control in conjunction with a program for determining kinematic variables during the execution of a recognition task.
Journal of Hand Surgery (European Volume), 2010