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Search Results: 1 - 10 of 20477 matches for " Ricardo Orozco "
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OPTIMIZACIóN DEL AISLAMIENTO TéRMICO DE UNA CUBIERTA TRANSPARENTE DE UN SECADOR HíBRIDO DE Guadua angustifolia
Orozco,Carlos Alberto; Acosta,Ricardo; Montoya,Jorge Augusto;
Biotecnología en el Sector Agropecuario y Agroindustrial , 2011,
Abstract: in a solar hybrid dryer (solar assisted gas or electricity) its main problem is to minimize its operational costs due to energy consumption. for this, was determined the optimum thickness of air confined in the plastic cover as thermal isolation, was calculated overall coefficient of heat transfer 'u', and was estimated the power of the external source which was of 1,8 kw and found that energy consumption is approximately 5,35 times less than the power of the hybrid dryer with single plastic deck. the concept is applicable to any type of solar dryer, solar-assisted or any greenhouse in agroindustrial area.
Caracterización biofísica y social del Centro Ceremonial Otomí Mexica, Estado de México
Ricardo Farfán Escalera,María Estela Orozco Hernández
Quivera , 2007,
Abstract: El Parque Estatal Centro Ceremonial Otomí- Mexica es representativo de un territorio de vocación forestal. Como parte de su histórica organización social, prevalece el régimen de propiedad social de la tierra y una significativa participación de población indígena. Por lo que en este estudio nos interesa exponer que las condiciones biofísicas del territorio y las precarias condiciones socioeconómicas de la población, han dado lugar a formas específicas de aprovechamiento del suelo en favor de la agricultura de subsistencia y en detrimento de la vocación forestal del área.
El lugar donde ocurren las lesiones y su relación con el uso de alcohol. Estudio en sala de urgencias
Ricardo Orozco,Guilherme Borges,Liliana Mondragón,Zuraya Monroy Nasr
Salud mental , 2005,
Abstract:
OPTIMIZACIóN DEL AISLAMIENTO TéRMICO DE UNA CUBIERTA TRANSPARENTE DE UN SECADOR HíBRIDO DE Guadua angustifolia OTIMIZA O DE ISOLAMENTO TéRMICO DE UMA TAMPA TRANSPARENTE DE SECADOR HíBRIDO DE Guadua angustifolia THERMAL INSULATION OPTIMIZATION OF A TRANSPARENT COVER FROM HYBRID DRYER OF Guadua angustifolia
Carlos Alberto Orozco,Ricardo Acosta,Jorge Augusto Montoya
Biotecnología en el Sector Agropecuario y Agroindustrial , 2011,
Abstract: El principal problema que tiene un secador solar híbrido (solar asistido con gas o electricidad) son sus costos de operación por consumo de energía. Para ello se determinó el espesor óptimo de aire confinado en la cubierta plástica el cual actúa como aislamiento térmico, se calculó el coeficiente global de transferencia de calor 'U', se estimó la potencia de la fuente externa la cual fue de 1,8 kW y se encontró que el consumo de energía es aproximadamente 5,35 veces menos que la potencia del secador híbrido con cubierta sencilla. El concepto es aplicable a cualquier tipo de secador solar, solar-asistido o cualquier invernadero para el sector agroindustrial. 0 principal problema con um secador solar híbrido (solar-gás assistido ou com electricidade) s o os custos operacionais para o consumo de energia. Para este fim a pesquisa determinou a espessura ideal de ar confinado na tampa de plástico (duas carnadas) que atua como isolamento térmico, foi calculada a taxa global de transferencia de calor 'U' e estimada pela alimenta o externa de 1,8 kW e descobriu que o consumo de energía é de cerca de 5,35 vezes menor do que a potência do secador revestido híbrido simples. 0 conceito é aplicável a qualquer tipo de secador solar, solar assistida ou qualquer tampa plástica no seitor agrícola. In a solar hybrid dryer (solar assisted gas or electricity) its main problem is to minimize its operational costs due to energy consumption. For this, was determined the optimum thickness of air confined in the plastic cover as thermal isolation, was calculated overall coefficient of heat transfer 'U', and was estimated the power of the external source which was of 1,8 kW and found that energy consumption is approximately 5,35 times less than the power of the hybrid dryer with single plastic deck. The concept is applicable to any type of solar dryer, solar-assisted or any greenhouse in agroindustrial area.
Analizador de Completitud de Requisitos Escritos en Espa ol Restringido.
Javier Navarro,Ricardo Orozco,Aldrin Fredy Jaramillo,Carlos Mario Zapata
Avances en Sistemas e Informática , 2005,
Abstract: In this paper, we propose a tool for Requirements completeness analysis over requirements written in restricted Spanish. This tool materialize a method for requirements completeness based on a linguistic approach, more specifically based on semantic cases associated with verb senses. We also present the process for effectiveness of the tool, in completeness on several case studies, using precision as a quantitative indicator of effectiveness. Weobtain some preliminary results confirming the hypothesis, and we show that this tool will be helpful for writing complete requirements specifications and for improving software quality based on them.
Prefrontal and Accumbal Electric Activity during Auditory Stimulation in Virgin Female Rats: Changes Related to the Estrous Cycle  [PDF]
Marisela Hernández-González, Diego Radberto Chapa García Abascal, Miguel ángel Guevara, Ricardo Alonso Romero Orozco, Mayra Linné Almanza Sepúlveda, Leopoldo Eduardo Flores Mancilla
Journal of Behavioral and Brain Science (JBBS) , 2013, DOI: 10.4236/jbbs.2013.36047
Abstract: The estrous cycle is a physiological process modulated by hormonal changes associated, in turn, with alterations of the attraction or sensitivity with which females perceive different sensory stimuli. Auditory stimuli play an important role in the social interaction of several mammals, including their sexual behavior and the mother-young relationship. Since the prefrontal cortex (PFC) and nucleus accumbens (Acc) had been associated with the processing and assignation of the incentive value of stimuli, this study was designed to analyze whether electroencephalographic (EEG) activity in the PFC and Acc was modified during the two antagonist phases of the estrous cycle (proestrus-estrus and diestrus) when female rats heard sound recordings with different types of cries emitted by other rats. EEGs were recorded in eight female virgin Wistar rats, 80-100 days old, bilaterally implanted in the PFC and Acc during an awake-quiet state, in three conditions: when hearing 1) cries of pups; 2) cries of adult male rats; and, 3) cries of adult female rats. The cries were recorded from pups (2-10 days old) and male and female adult rats after gentle prodding by a human hand. Each auditory stimulus (which included vocalizations up to 22 kHz) was randomly played back through a speaker placed near the female rats. Only upon perceiving the cries of male rats did the females in the proestrus-estrous phase show a lower relative power in the 14-30 Hz band in the Acc and an increased inter-prefrontal correlation in the 8-13 Hz band. It is probable that these EEG changes are associated with the lower activation or non-anxious state that the female rat presents specifically during the proestrus-estrous phase in response to the alarm cries of adult male rats.


Environmental Issues of a Marine Protected Area in a Tectonic Estuary in the Tropical Eastern Pacific: Uramba (Malaga Bay Colombia): Context, Biodiversity, Threats and Challenges  [PDF]
Jaime Ricardo Cantera Kintz, Edgardo Londo?o-Cruz, Luz Marina Mejía-Ladino, Leonardo Herrera-Orozco, Carlos Andrés Satizabal, Natalia Uribe-Casta?eda
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.511109
Abstract:

The environmental protection of tropical marine and coastal areas faces different challenges due to the diversity of aspects related to these areas, which include natural, social and economical issues. Despite these challenges, efforts for the protection of these areas are urgent nowadays because of the dramatical increase of human related threats like habitat destruction and population growth. Malaga Bay (MB) is a tectonic estuarine system located in Panama Bight (central region of the Colombian Pacific coast), which due to its origin shows important environmental characteristics of few sites in the Tropical Eastern Pacific (TEP) match. For these reasons, the government of Colombia declared in 2010, the bay’s marine area as a Marine National Natural Park in order to preserve its unique estuarine marine biodiversity. Despite this measure, MB presents several conditions that make environmental protection a very difficult task. In this paper, we present the geographical context, biodiversity and natural resources, environmental threats, the complexity of economic and social context, and the institutional and legal context of MB, to exemplify the difficulty that the protection of marine areas face in the TEP.

Desempe?o ambiental de los recursos naturales en comunidades rurales, Estado de México
Orozco Hernández, María Estela;Farfán Escalera, Ricardo;Gutiérrez Sánchez, Dulce Leonor;
Investigaciones geográficas , 2011,
Abstract: this research examines the environmental conditions of natural resources in relation to the use and management modes in sixteen rural communities of san felipe del progreso, state of mexico. through documentary information, statistics and mapping was carried out social and biophysical characterization of the study area, and data collected from the experience of the residents, fed the evaluation system pressure-state-response and cause-effect matrix that synthesizes the community's environmental performance.
Utilidad de la elastografía de transición (Fibroscan?) en la evaluación de la fibrosis hepática en pacientes con hepatopatía crónica
álvarez,Daniel; Anders,María; Mella,José; Amante,Marcelo; Orozco,Federico; Mastai,Ricardo;
Medicina (Buenos Aires) , 2012,
Abstract: the prognosis and management of chronic liver disease largely depends on the extent and progression of liver fibrosis. unfortunately, liver biopsy, an invasive and painful technique with several limitations, continues to be the gold standard for the staging and grading of fibrosis. therefore, accurate noninvasive tests for liver injury are urgently needed. during the last years, transient elastography (fibroscan?) has been proposed for the assessment of hepatic fibrosis in patients with chronic liver disease, by measuring liver stiffness. the aim of this study was to evaluate the effectiveness, objectivity and safety of this technique. we included 68 patients who underwent a liver biopsy in the last 18 months with a wide spectrum of chronic liver diseases. all procedures as well as the liver biopsies according to the metavir scoring system were analyzed by the same sonographer and the same specialist in pathology, respectively. median value of stiffness with none or mild fibrosis (f0 and fi), and severe fibrosis or cirrhosis (f3 and f4) was 6.8 ± 3.0 kpa and 21.0 ± 15.1 kpa, respectively, with a significant difference between them (p < 0.01). the areas under the receiver operating characteristic curves showed the optimal liver stiffness cut-off values for each group. we found also a positive correlation between liver stiffness found by transient elastography and fibrosis stage on biopsy in all patients, independently of the liver disease etiology. fibroscan? is an easy, quick to perform and safe non-invasive method, reliable for assessing liver fibrosis.
COMPUESTOS FENóLICOS AISLADOS DE LA ESPECIE Solanum validinervium (Solanaceae) SECCION GEMINATA
Cuca Suarez,Luis Enrique; Mu?oz Cendales,Diego Ricardo; Orozco,Clara Inés;
Revista Colombiana de Química , 2006,
Abstract: from the ethanolic extract of the aerial part of solanum validinervium, compounds 2-(4’-hydroxyphenyl)-ethanol, the coumarins sculetin and isoscopoletin, and a new glucoside of coumarin 1’-o-7-esculetin-4’-o-1’’-ethylenglicol-β-d-glucopiranose were isolated. their structures were elucidated by means of spectroscopic techniques (ir and rmn-1h, rmn-13c in one and two dimensions).
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