Jorge Rosas | UDG - Academia.edu (original) (raw)
Papers by Jorge Rosas
Quality assessment of coffee beans through computer vision and machine learning algorithms
Coffee Science
Journal of Experimental Agriculture International
The challenge of recovering degraded soils due to salinity excess leads to the search for more ef... more The challenge of recovering degraded soils due to salinity excess leads to the search for more effective strategies that can overcome this problem. Among these, one of the approaches is the use of resistant plant varieties in affected areas. This study aimed to evaluate the influence of different doses of salts on seed germination and seedling formation of two lettuce cultivars (Hanson and H121) and to verify the existence of tolerance among the cultivars. A completely randomized design was used in a 2x5x4 factorial scheme, where the cultivars were evaluated under five distinct salt doses (0, 25, 50, 75 and 100 mol.m-3, conductivities of 0.0, 2.8, 5.4, 8.0 and 10.6 dS.m-1, respectively), with four replicates. In this sense, the following variables were evaluated: germination rate (GR), germination speed index (GSI), seedling height (SH), root length (RL) and percentage of dry matter in relation to fresh matter (DM%). As a result, the Hanson cultivar presented better performance th...
Catedral Tomada. Revista de crítica literaria latinoamericana
The purpose of this analysis is to propose a theoretical-critical-literary approach and from a po... more The purpose of this analysis is to propose a theoretical-critical-literary approach and from a post-historical edge to the poetic work Vírgenes del Sol Inn Cabaret: vien benidos a la máquina welcome to the tv by Alexis Figueroa (1986). This approach leads us to understand its production from three keys: endoculturation, literary competence and endotextuality. All of them give an account of the cultural framework in which they are immersed, writer and / or reader, and must be found in the work, which is rather an endotextual synthesis of endoculturation and literary competence.
Remote Sensing
Characterizing the land surface temperature (LST) and its diurnal cycle is important in understan... more Characterizing the land surface temperature (LST) and its diurnal cycle is important in understanding a range of surface properties, including soil moisture status, evaporative response, vegetation stress and ground heat flux. While remote-sensing platforms present a number of options to retrieve this variable, there are inevitable compromises between the resolvable spatial and temporal resolution. For instance, the spatial resolution of geostationary satellites, which can provide sub-hourly LST, is often too coarse (3 km) for many applications. On the other hand, higher-resolution polar orbiting satellites are generally infrequent in time, with return intervals on the order of weeks, limiting their capacity to capture surface dynamics. With recent developments in the application of unmanned aerial vehicles (UAVs), there is now the opportunity to collect LST measurements on demand and at ultra-high spatial resolution. Here, we detail the collection and analysis of a UAV-based LST da...
Remote Sensing for Agriculture, Ecosystems, and Hydrology XVIII
Crop height measured from UAVs fitted with commercially available RGB cameras provide an affordab... more Crop height measured from UAVs fitted with commercially available RGB cameras provide an affordable alternative to retrieve field scale high resolution estimates. The study presents an assessment of between flight reproducibility of Crop Surface Maps (CSM) extracted from Digital Surface Maps (DSM) generated by Structure from Motion (SfM) algorithms. Flights were conducted over a centre pivot irrigation system covered with an alfalfa crop. An important step in calculating the absolute crop height from the UAV derived DSM is determining the height of the underlying terrain. Here we use automatic thresholding techniques applied to RGB vegetation index maps to classify vegetated and soil pixels. From interpolation of classified soil pixels, a terrain map is calculated and subtracted from the DSM. The influence of three different thresholding techniques on CSMs are investigated. Median Alfalfa crop heights determined with the different thresholding methods varied from 18cm for K means thresholding to 13cm for Otsu thresholding methods. Otsu thresholding also gave the smallest range of crop heights and K means thresholding the largest. Reproducibility of median crop heights between flight surveys was 4-6cm for all thresholding techniques. For the flight conducted later in the afternoon shadowing caused soil pixels to be classified as vegetation in key locations around the domain, leading to lower crop height estimates. The range of crop heights was similar for both flights using K means thresholding (35-36cm), local minimum thresholding depended on whether raw or normalised RGB intensities were used to calculate vegetation indices (30-35cm), while Otsu thresholding had a smaller range of heights and varied most between flights (26-30cm). This study showed that crop heights from multiple survey flights are comparable, however, they were dependent on the thresholding method applied to classify soil pixels and the time of day the flight was conducted.
Boletín Científico CIOH
Cada imagen fué corregida radio métricamente en término de reflectancia dispersa y calibrada con ... more Cada imagen fué corregida radio métricamente en término de reflectancia dispersa y calibrada con base en la concentración de sólidos en suspensión medidos en NTU. Los mapas temáticos de isolineas obtenidos se han incluido en la base de datos que el Centro de Investigaciones Oceanográficas e Hidrográficas administra en ambiente SIG, como nuevos datos para el programa del centro de acopio, procesamiento, análisis y distribución concerniente a la zona costera del Caribe colombiano. Estas imágenes muestran los diferentes comportamientos de las masas de agua a través de los sedimentos en suspensión. Se obtuvo una tipificación de las situaciones que se presentan. Los resultados
Flotation of non-sulphide copper ores
Efectividad de los procedimientos intervencionistas de la cadena simpática
Rev Argent Anestesiol, Dec 1, 2005
Base de dados : LILACS. Pesquisa : 431483 [Identificador único]. Referências encontradas : 1 [ref... more Base de dados : LILACS. Pesquisa : 431483 [Identificador único]. Referências encontradas : 1 [refinar]. Mostrando: 1 .. 1 no formato [Detalhado]. página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos relacionados. Id: 431483. ...
Acta Medica Colombiana, 2007
(IECA) o un bloqueante del receptor de angiotensina tipo II (ARA II) más espironolactona y los ni... more (IECA) o un bloqueante del receptor de angiotensina tipo II (ARA II) más espironolactona y los niveles de potasio sérico en los pacientes adultos con insuficiencia cardiaca y tasa de filtración glomerular (TFG) mayor o igual a 60 mL/min, que acuden a la consulta de cardiología de dos centros hospitalarios de la ciudad de Manizales. Diseño: estudio de tipo prospectivo, observacional, de casos incidentes. Material y métodos: se incluyeron 30 pacientes con diagnóstico de insuficiencia cardiaca, que recibían la combinación farmacológica IECA o ARA II más espironolactona, cuya depuración de creatinina fuera mayor o igual a 60 mL/min. Se hizo seguimiento durante seis meses, evaluando cada mes electrolitos y pruebas de función renal. El análisis estadístico, para las variables cualitativas, se realizó con la prueba de Chi cuadrado; para las variables cuantitativas se utilizó la prueba de t de Student. Se utilizó el programa EpiInfo Versión 6.04 d y Epidata 3.1. Resultados: se encontraron 368 pacientes con diagnóstico de insuficiencia cardiaca, 126 de estos residían en la ciudad de Manizales, de los cuales 54 presentaron una depuración de creatinina menor o igual a 59 mL/min, 20 pacientes fueron sometidos a cambio de la medicación de base, siete no acudieron a ningún control, 13 rehusaron colaborar en el estudio, dos no pudieron ser ubicados, quedando 30 pacientes al inicio del seguimiento. 76.7% (23) eran hombres, la edad promedio de los participantes del estudio fue de 67 años, con un rango entre 33 y 89 (DE 12.6). En el 66% de los pacientes (20) se encontró el antecedente de infarto del miocardio (ninguno con diabetes mellitus), el promedio de evolución en años de falla cardiaca fue de 6.6, con un rango entre uno y 15 (DE de 4.073). Ningún paciente alcanzó una depuración de creatinina menor o igual a 59 mL/min. El 23.3% de los pacientes presentó hiperkalemia (n=7) durante el seguimiento, cinco de éstos fueron hombres, y en su gran mayoria mayores de 65 años con un 57.1% (4 pacientes).Cuando se analizó la etiología de la insuficiencia cardiaca en este grupo, se encontró que el 71.4% (cinco pacientes) tenían el antecedente de una cardiopatía isquémica. En dos pacientes se presentó una enfermedad diarreica y en otro una obstrucción urinaria aguda como precipitante del episodio de hiperkalemia. En los otros no se evidenció ningún desencadenante. Conclusión: los datos obtenidos a partir del presente estudio informan que se puede presentar una asociación entre uso de IECA o ARA II más espironolactona y el desarrollo de hiperkalemia en pacientes con insuficiencia cardiaca y depuración de creatinina mayor o igual a 60 mL/min, siendo de mayor importancia aquéllos con antecedente de cardiopatía isquémica y clase funcional NYHA III o IV, por lo que en éstos se debería llevar un control estricto médico y de laboratorio. (Acta Med Colomb 2007; 32: 212-218). Palabras clave: inhibidores de la enzima convertidora de angiotensina, bloqueantes del receptor de angiotensina tipo II, espironolactona, hiperkalemia, insuficiencia cardiaca.
Comparación entre nubian sp vs nubian sp con clonidina en analgesia posoperatoria para pacientes sometidos a cirugía perianal
Revista De La Facultad De Medicina, May 10, 2009
... humanos por una vía no opioide, actuando en los receptores alfa 2 del cuerno dorsal del cor-d... more ... humanos por una vía no opioide, actuando en los receptores alfa 2 del cuerno dorsal del cor-dón espinal; las terminales ... 2 adrenérgicos.1 Los receptores adrenérgicos presinápticos están presentes en los nervios simpáticos terminales y en las neuronas nora-drenérgicas en ...
Operaciones de Factoring como alternativa de financiamiento
Procedimiento Para La Gestión De La Estimulación en La Empresa Cubana Contemporánea. Caso De Estudio
Page 1. PROCEDIMIENTO PARA LA GESTIÓN DE LA ESTIMULACIÓN EN LA EMPRESA CUBANA CONTEMPORÁNEA. CASO... more Page 1. PROCEDIMIENTO PARA LA GESTIÓN DE LA ESTIMULACIÓN EN LA EMPRESA CUBANA CONTEMPORÁNEA. CASO DE ESTUDIO. Ing. Elisa I. Reyes Batista Ingeniera Industrial, especialista en Gestión de Recursos Humanos de la Empresa de Tabacos ...
Acta Medica Peruana, Apr 1, 2009
Influenza is a highly contagious disease. There are some historical descriptions of this conditio... more Influenza is a highly contagious disease. There are some historical descriptions of this condition by ancient Greek physicians, and the etiological agents have been known only for the last eight decades. The causative agent is the influenza virus, which has three main types: A, B, and C. Type A is capable of circulating within many different biological reservoirs, including humans, swine, and birds. It also has high genetic variability, which allows it to have minor antigenic drifts or mutations which are responsible of epidemics in humans. Sometimes changes are quite marked, leading to pandemics. In a globalized world, with more than 6 billion inhabitants, with many social inequities and evident climate changes, influenza viruses are a permanent risk for mankind. Clinical features for the different viral subtypes may vary from subtle infections to full blown and severe, life-threatening forms. Event with the great advances in diagnostics and immunization, the manufacture and distribution of new diagnostic kits may take some time, and new vaccines are not always readily available. Specific therapies against influenza are not well developed. There are two groups of drugs, the so called adamantane derivatives, such as amantadine and rimantadine, and the neuraminidase inhibitors, such as oseltamivir and zanamivir. Most vulnerable areas for the new flu pandemics include developing countries, particularly the poorest ones, so that the greatest effort must be made for helping these areas.
Towards a satellite based system for monitoring agricultural water use: A case study for Saudi Arabia
2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015
Sistema inalámbrico de alarma domiciliaria con alerta vía celular
... Jorge Galarza Rosas (1), Ricardo Cajo Díaz (2), Hugo Villavicencio (3) Facultad de Ingeniería... more ... Jorge Galarza Rosas (1), Ricardo Cajo Díaz (2), Hugo Villavicencio (3) Facultad de Ingeniería Eléctrica y Computación (FIEC) Escuela Superior Politécnica de Litoral ... Martin Daniel C, Funcionamientos de Teclado matricial 4x4 y LCDs, http://www.x-robotics.com/rutinas.htm ...
Environmental Earth Sciences, 2014
Wadi channel recharge to the underlying alluvial aquifer is naturally limited by the flashy natur... more Wadi channel recharge to the underlying alluvial aquifer is naturally limited by the flashy nature of flood events, evapotranspiration losses of water from the vadose zone, and aquifer heterogeneity, particularly low vertical hydraulic conductivity. Anthropogenic lowering of the water table in many wadi aquifers has also reduced the potential recharge by increasing the thickness of the vadose zone, causing interflow water loss from surface emergence and evaporation. A method to enhance recharge is to slow the flow within wadi channels by placement of dam structures, thereby ponding water and increasing the vertical head gradient to create a more rapid rate of infiltration and percolation. Effectiveness of wadi dams to enhance aquifer recharge reduces over time due to mud deposition within the reservoir caused by storm events. Up to 80 % of the water in old wadi reservoirs is lost to free-surface evaporation before infiltration and recharge can occur. One method to maintain or increase the rate of recharge is to convey clean water by gravity flow from the reservoir down-gradient to artificially recharge the aquifer using existing wells. This type of system is a low-cost and lowenergy recharge method which could greatly enhance groundwater storage in wadi aquifers. Modeling results show that existing wells could store up to 1,000 m 3 /day under gravity-feed conditions and up to 3,900 m 3 /day with the shut-in of the well to produce a pressurized system.
Environmental Earth Sciences, 2014
Grain size distribution, porosity, and hydraulic conductivity were determined for 39 sediment sam... more Grain size distribution, porosity, and hydraulic conductivity were determined for 39 sediment samples collected from ephemeral streams (wadis) in western Saudi Arabia. The measured hydraulic conductivity values were then compared to values calculated using 20 different empirical equations commonly used to estimate hydraulic conductivity from grain size analyses. It was found that most of the hydraulic conductivity values estimated from the empirical equations correlated very poorly with the measured hydraulic conductivity values. Modifications of the empirical equations, including changes to special coefficients and statistical offsets, were made to produce modified equations that considerably improved the hydraulic conductivity estimates from grain size data for wadi sediments. The Chapuis, Hazen, Kozeny, Slichter, Terzaghi, and Barr equations produced the best correlations, but still had relatively high predictive errors. The Chapius equation was modified for wadi sediments by incorporating mud percentage and the standard deviation (in phi units) into a new equation that reduced the predicted hydraulic conductivity error to ±14.1 m/day. The equation is best applied to ephemeral stream samples that have hydraulic conductive values greater than 2 m/day.
Intelligent Systems for Manufacturing, 1998
Algebraic specification of processes is an emerging research issue in last years as a tool for fo... more Algebraic specification of processes is an emerging research issue in last years as a tool for formalization of system design processes, essentially in computer sciences. By a formal specification we are able to prove formally rigirousness of functional requirements and theirs implementations. Traditional approach to system implementation based on trial-and-error (Le. experimentation) practise is informal and inefficient for a large number of systems. The paper contributes to application of a formal algebraic specification, as a rigorous formalism, in manufacturing systems design and control, specifically for the CAD/CAPP systems specification. The formal algebraic specifiication provides a rigorous base for its correct specification and implementation in a programming language, Le. for efficient and correct development of corresponded software tools.
Quality assessment of coffee beans through computer vision and machine learning algorithms
Coffee Science
Journal of Experimental Agriculture International
The challenge of recovering degraded soils due to salinity excess leads to the search for more ef... more The challenge of recovering degraded soils due to salinity excess leads to the search for more effective strategies that can overcome this problem. Among these, one of the approaches is the use of resistant plant varieties in affected areas. This study aimed to evaluate the influence of different doses of salts on seed germination and seedling formation of two lettuce cultivars (Hanson and H121) and to verify the existence of tolerance among the cultivars. A completely randomized design was used in a 2x5x4 factorial scheme, where the cultivars were evaluated under five distinct salt doses (0, 25, 50, 75 and 100 mol.m-3, conductivities of 0.0, 2.8, 5.4, 8.0 and 10.6 dS.m-1, respectively), with four replicates. In this sense, the following variables were evaluated: germination rate (GR), germination speed index (GSI), seedling height (SH), root length (RL) and percentage of dry matter in relation to fresh matter (DM%). As a result, the Hanson cultivar presented better performance th...
Catedral Tomada. Revista de crítica literaria latinoamericana
The purpose of this analysis is to propose a theoretical-critical-literary approach and from a po... more The purpose of this analysis is to propose a theoretical-critical-literary approach and from a post-historical edge to the poetic work Vírgenes del Sol Inn Cabaret: vien benidos a la máquina welcome to the tv by Alexis Figueroa (1986). This approach leads us to understand its production from three keys: endoculturation, literary competence and endotextuality. All of them give an account of the cultural framework in which they are immersed, writer and / or reader, and must be found in the work, which is rather an endotextual synthesis of endoculturation and literary competence.
Remote Sensing
Characterizing the land surface temperature (LST) and its diurnal cycle is important in understan... more Characterizing the land surface temperature (LST) and its diurnal cycle is important in understanding a range of surface properties, including soil moisture status, evaporative response, vegetation stress and ground heat flux. While remote-sensing platforms present a number of options to retrieve this variable, there are inevitable compromises between the resolvable spatial and temporal resolution. For instance, the spatial resolution of geostationary satellites, which can provide sub-hourly LST, is often too coarse (3 km) for many applications. On the other hand, higher-resolution polar orbiting satellites are generally infrequent in time, with return intervals on the order of weeks, limiting their capacity to capture surface dynamics. With recent developments in the application of unmanned aerial vehicles (UAVs), there is now the opportunity to collect LST measurements on demand and at ultra-high spatial resolution. Here, we detail the collection and analysis of a UAV-based LST da...
Remote Sensing for Agriculture, Ecosystems, and Hydrology XVIII
Crop height measured from UAVs fitted with commercially available RGB cameras provide an affordab... more Crop height measured from UAVs fitted with commercially available RGB cameras provide an affordable alternative to retrieve field scale high resolution estimates. The study presents an assessment of between flight reproducibility of Crop Surface Maps (CSM) extracted from Digital Surface Maps (DSM) generated by Structure from Motion (SfM) algorithms. Flights were conducted over a centre pivot irrigation system covered with an alfalfa crop. An important step in calculating the absolute crop height from the UAV derived DSM is determining the height of the underlying terrain. Here we use automatic thresholding techniques applied to RGB vegetation index maps to classify vegetated and soil pixels. From interpolation of classified soil pixels, a terrain map is calculated and subtracted from the DSM. The influence of three different thresholding techniques on CSMs are investigated. Median Alfalfa crop heights determined with the different thresholding methods varied from 18cm for K means thresholding to 13cm for Otsu thresholding methods. Otsu thresholding also gave the smallest range of crop heights and K means thresholding the largest. Reproducibility of median crop heights between flight surveys was 4-6cm for all thresholding techniques. For the flight conducted later in the afternoon shadowing caused soil pixels to be classified as vegetation in key locations around the domain, leading to lower crop height estimates. The range of crop heights was similar for both flights using K means thresholding (35-36cm), local minimum thresholding depended on whether raw or normalised RGB intensities were used to calculate vegetation indices (30-35cm), while Otsu thresholding had a smaller range of heights and varied most between flights (26-30cm). This study showed that crop heights from multiple survey flights are comparable, however, they were dependent on the thresholding method applied to classify soil pixels and the time of day the flight was conducted.
Boletín Científico CIOH
Cada imagen fué corregida radio métricamente en término de reflectancia dispersa y calibrada con ... more Cada imagen fué corregida radio métricamente en término de reflectancia dispersa y calibrada con base en la concentración de sólidos en suspensión medidos en NTU. Los mapas temáticos de isolineas obtenidos se han incluido en la base de datos que el Centro de Investigaciones Oceanográficas e Hidrográficas administra en ambiente SIG, como nuevos datos para el programa del centro de acopio, procesamiento, análisis y distribución concerniente a la zona costera del Caribe colombiano. Estas imágenes muestran los diferentes comportamientos de las masas de agua a través de los sedimentos en suspensión. Se obtuvo una tipificación de las situaciones que se presentan. Los resultados
Flotation of non-sulphide copper ores
Efectividad de los procedimientos intervencionistas de la cadena simpática
Rev Argent Anestesiol, Dec 1, 2005
Base de dados : LILACS. Pesquisa : 431483 [Identificador único]. Referências encontradas : 1 [ref... more Base de dados : LILACS. Pesquisa : 431483 [Identificador único]. Referências encontradas : 1 [refinar]. Mostrando: 1 .. 1 no formato [Detalhado]. página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos relacionados. Id: 431483. ...
Acta Medica Colombiana, 2007
(IECA) o un bloqueante del receptor de angiotensina tipo II (ARA II) más espironolactona y los ni... more (IECA) o un bloqueante del receptor de angiotensina tipo II (ARA II) más espironolactona y los niveles de potasio sérico en los pacientes adultos con insuficiencia cardiaca y tasa de filtración glomerular (TFG) mayor o igual a 60 mL/min, que acuden a la consulta de cardiología de dos centros hospitalarios de la ciudad de Manizales. Diseño: estudio de tipo prospectivo, observacional, de casos incidentes. Material y métodos: se incluyeron 30 pacientes con diagnóstico de insuficiencia cardiaca, que recibían la combinación farmacológica IECA o ARA II más espironolactona, cuya depuración de creatinina fuera mayor o igual a 60 mL/min. Se hizo seguimiento durante seis meses, evaluando cada mes electrolitos y pruebas de función renal. El análisis estadístico, para las variables cualitativas, se realizó con la prueba de Chi cuadrado; para las variables cuantitativas se utilizó la prueba de t de Student. Se utilizó el programa EpiInfo Versión 6.04 d y Epidata 3.1. Resultados: se encontraron 368 pacientes con diagnóstico de insuficiencia cardiaca, 126 de estos residían en la ciudad de Manizales, de los cuales 54 presentaron una depuración de creatinina menor o igual a 59 mL/min, 20 pacientes fueron sometidos a cambio de la medicación de base, siete no acudieron a ningún control, 13 rehusaron colaborar en el estudio, dos no pudieron ser ubicados, quedando 30 pacientes al inicio del seguimiento. 76.7% (23) eran hombres, la edad promedio de los participantes del estudio fue de 67 años, con un rango entre 33 y 89 (DE 12.6). En el 66% de los pacientes (20) se encontró el antecedente de infarto del miocardio (ninguno con diabetes mellitus), el promedio de evolución en años de falla cardiaca fue de 6.6, con un rango entre uno y 15 (DE de 4.073). Ningún paciente alcanzó una depuración de creatinina menor o igual a 59 mL/min. El 23.3% de los pacientes presentó hiperkalemia (n=7) durante el seguimiento, cinco de éstos fueron hombres, y en su gran mayoria mayores de 65 años con un 57.1% (4 pacientes).Cuando se analizó la etiología de la insuficiencia cardiaca en este grupo, se encontró que el 71.4% (cinco pacientes) tenían el antecedente de una cardiopatía isquémica. En dos pacientes se presentó una enfermedad diarreica y en otro una obstrucción urinaria aguda como precipitante del episodio de hiperkalemia. En los otros no se evidenció ningún desencadenante. Conclusión: los datos obtenidos a partir del presente estudio informan que se puede presentar una asociación entre uso de IECA o ARA II más espironolactona y el desarrollo de hiperkalemia en pacientes con insuficiencia cardiaca y depuración de creatinina mayor o igual a 60 mL/min, siendo de mayor importancia aquéllos con antecedente de cardiopatía isquémica y clase funcional NYHA III o IV, por lo que en éstos se debería llevar un control estricto médico y de laboratorio. (Acta Med Colomb 2007; 32: 212-218). Palabras clave: inhibidores de la enzima convertidora de angiotensina, bloqueantes del receptor de angiotensina tipo II, espironolactona, hiperkalemia, insuficiencia cardiaca.
Comparación entre nubian sp vs nubian sp con clonidina en analgesia posoperatoria para pacientes sometidos a cirugía perianal
Revista De La Facultad De Medicina, May 10, 2009
... humanos por una vía no opioide, actuando en los receptores alfa 2 del cuerno dorsal del cor-d... more ... humanos por una vía no opioide, actuando en los receptores alfa 2 del cuerno dorsal del cor-dón espinal; las terminales ... 2 adrenérgicos.1 Los receptores adrenérgicos presinápticos están presentes en los nervios simpáticos terminales y en las neuronas nora-drenérgicas en ...
Operaciones de Factoring como alternativa de financiamiento
Procedimiento Para La Gestión De La Estimulación en La Empresa Cubana Contemporánea. Caso De Estudio
Page 1. PROCEDIMIENTO PARA LA GESTIÓN DE LA ESTIMULACIÓN EN LA EMPRESA CUBANA CONTEMPORÁNEA. CASO... more Page 1. PROCEDIMIENTO PARA LA GESTIÓN DE LA ESTIMULACIÓN EN LA EMPRESA CUBANA CONTEMPORÁNEA. CASO DE ESTUDIO. Ing. Elisa I. Reyes Batista Ingeniera Industrial, especialista en Gestión de Recursos Humanos de la Empresa de Tabacos ...
Acta Medica Peruana, Apr 1, 2009
Influenza is a highly contagious disease. There are some historical descriptions of this conditio... more Influenza is a highly contagious disease. There are some historical descriptions of this condition by ancient Greek physicians, and the etiological agents have been known only for the last eight decades. The causative agent is the influenza virus, which has three main types: A, B, and C. Type A is capable of circulating within many different biological reservoirs, including humans, swine, and birds. It also has high genetic variability, which allows it to have minor antigenic drifts or mutations which are responsible of epidemics in humans. Sometimes changes are quite marked, leading to pandemics. In a globalized world, with more than 6 billion inhabitants, with many social inequities and evident climate changes, influenza viruses are a permanent risk for mankind. Clinical features for the different viral subtypes may vary from subtle infections to full blown and severe, life-threatening forms. Event with the great advances in diagnostics and immunization, the manufacture and distribution of new diagnostic kits may take some time, and new vaccines are not always readily available. Specific therapies against influenza are not well developed. There are two groups of drugs, the so called adamantane derivatives, such as amantadine and rimantadine, and the neuraminidase inhibitors, such as oseltamivir and zanamivir. Most vulnerable areas for the new flu pandemics include developing countries, particularly the poorest ones, so that the greatest effort must be made for helping these areas.
Towards a satellite based system for monitoring agricultural water use: A case study for Saudi Arabia
2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015
Sistema inalámbrico de alarma domiciliaria con alerta vía celular
... Jorge Galarza Rosas (1), Ricardo Cajo Díaz (2), Hugo Villavicencio (3) Facultad de Ingeniería... more ... Jorge Galarza Rosas (1), Ricardo Cajo Díaz (2), Hugo Villavicencio (3) Facultad de Ingeniería Eléctrica y Computación (FIEC) Escuela Superior Politécnica de Litoral ... Martin Daniel C, Funcionamientos de Teclado matricial 4x4 y LCDs, http://www.x-robotics.com/rutinas.htm ...
Environmental Earth Sciences, 2014
Wadi channel recharge to the underlying alluvial aquifer is naturally limited by the flashy natur... more Wadi channel recharge to the underlying alluvial aquifer is naturally limited by the flashy nature of flood events, evapotranspiration losses of water from the vadose zone, and aquifer heterogeneity, particularly low vertical hydraulic conductivity. Anthropogenic lowering of the water table in many wadi aquifers has also reduced the potential recharge by increasing the thickness of the vadose zone, causing interflow water loss from surface emergence and evaporation. A method to enhance recharge is to slow the flow within wadi channels by placement of dam structures, thereby ponding water and increasing the vertical head gradient to create a more rapid rate of infiltration and percolation. Effectiveness of wadi dams to enhance aquifer recharge reduces over time due to mud deposition within the reservoir caused by storm events. Up to 80 % of the water in old wadi reservoirs is lost to free-surface evaporation before infiltration and recharge can occur. One method to maintain or increase the rate of recharge is to convey clean water by gravity flow from the reservoir down-gradient to artificially recharge the aquifer using existing wells. This type of system is a low-cost and lowenergy recharge method which could greatly enhance groundwater storage in wadi aquifers. Modeling results show that existing wells could store up to 1,000 m 3 /day under gravity-feed conditions and up to 3,900 m 3 /day with the shut-in of the well to produce a pressurized system.
Environmental Earth Sciences, 2014
Grain size distribution, porosity, and hydraulic conductivity were determined for 39 sediment sam... more Grain size distribution, porosity, and hydraulic conductivity were determined for 39 sediment samples collected from ephemeral streams (wadis) in western Saudi Arabia. The measured hydraulic conductivity values were then compared to values calculated using 20 different empirical equations commonly used to estimate hydraulic conductivity from grain size analyses. It was found that most of the hydraulic conductivity values estimated from the empirical equations correlated very poorly with the measured hydraulic conductivity values. Modifications of the empirical equations, including changes to special coefficients and statistical offsets, were made to produce modified equations that considerably improved the hydraulic conductivity estimates from grain size data for wadi sediments. The Chapuis, Hazen, Kozeny, Slichter, Terzaghi, and Barr equations produced the best correlations, but still had relatively high predictive errors. The Chapius equation was modified for wadi sediments by incorporating mud percentage and the standard deviation (in phi units) into a new equation that reduced the predicted hydraulic conductivity error to ±14.1 m/day. The equation is best applied to ephemeral stream samples that have hydraulic conductive values greater than 2 m/day.
Intelligent Systems for Manufacturing, 1998
Algebraic specification of processes is an emerging research issue in last years as a tool for fo... more Algebraic specification of processes is an emerging research issue in last years as a tool for formalization of system design processes, essentially in computer sciences. By a formal specification we are able to prove formally rigirousness of functional requirements and theirs implementations. Traditional approach to system implementation based on trial-and-error (Le. experimentation) practise is informal and inefficient for a large number of systems. The paper contributes to application of a formal algebraic specification, as a rigorous formalism, in manufacturing systems design and control, specifically for the CAD/CAPP systems specification. The formal algebraic specifiication provides a rigorous base for its correct specification and implementation in a programming language, Le. for efficient and correct development of corresponded software tools.