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Search Results: 1 - 10 of 192131 matches for " Henao-Díaz "
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PATRONES DE DIVERSIDAD DE EPíFITAS EN BOSQUES DE TIERRAS BAJAS Y SUBANDINOS
Henao-Díaz,Luis Francisco; Pacheco-Fernández,Natalia María; Argüello-Bernal,Sofía; Moreno-Arocha,Margarita María; Stevenson,Pablo R.;
Colombia Forestal , 2012,
Abstract: tropical rainforests are the most diverse ecosystems on the planet. although many theories have been proposed to explain their richness we currently know little about their relative importance. this diversity is threatened by anthropogenic disturbances such as fragmentation and forest degradation. in this study we compared epiphytic plant diversity patterns in lowland and subandean forests. more epiphytic diversity was found in subandean (pnn cueva de los guácharos) compared to lowland forest (palmarí reserve). in addition a higher abundance of epiphytes was found in conserved forest. tree host diversity was higher in lowland forests than in subandean forests, so we can reject the possibility that differences between the patterns of epiphytic diversity are caused by regional effects of plant diversity. our results suggest that humidity seems to be the most important environmental filter explaining epiphyte diversity.
A novel graphical and analytical method for thekinematic analysis of fourth class Assur groups
Quintero,Héctor; Calle,Gabriel; Díaz,Alexander; Henao,Edison;
Revista Facultad de Ingeniería Universidad de Antioquia , 2011,
Abstract: a method for the kinematic analysis of a fourth class assur group, using a combination of graphical and analytical methods, is presented in this paper. the solution is obtained through a method in which two special assur points are used. a mechanism of 1 dof with a fourth class group is considered as an example to develop the proposed method. the results of this method are in agreement with the results obtained by a dynamic simulation program. since there are no solutions for fourth class structural groups in the literature, this method allows developing a complete modular procedure for the kinematic analysis of mechanisms, with the methodological advantages that this type of solution offers.
SOLUCIóN AL PROBLEMA COMBINADO DE UBICACIóN ESTRATéGICA DE ALMACENES Y ASIGNACIóN DE INVENTARIOS USANDO TéCNICAS HEURíSTICAS
MORENO VELáSQUEZ,LUIS FERNANDO; VELáSQUEZ HENAO,JUAN DAVID; DíAZ SERNA,FRANCISCO JAVIER;
DYNA , 2005,
Abstract: the combined problem of location of warehouses and optimal allocation of inventories is quite difficult to pose and to solve by analytical methods. it is searched to determine the warehouses that must be selected of a given set, as well as the inventories associated to each one of them, to satisfy the demand of an article set with a given confidence level. it is presented an analysis of the generic exposition of the problem and a heuristic methodology of solution based on the exploration of the space of solutions, eliminating during the execution of the algorithm, those that are dominated, which must used in problems with a moderated number of warehouses. the second, is the tabu search method, which is used when bep is inappropriate. a comparison between bep and tabu search method is made.
Acondicionamiento de equipo para prueba Erichsen de embutido
Andres Felipe Cuartas C.,Alexander Díaz Arias,Edison Henao Casta?eda
Scientia Et Technica , 2007,
Abstract: En este trabajo se describe el proceso utilizado para adaptar un equipo de ensayo de embutido profundo WPM-TZP para que pueda realizar la prueba Erichsen siguiendo como norma guía la ASTM E643. La metodología se enfoca hacia la adaptación del sistema electrohidráulico y del dise o de la herramienta de ensayo a partir de la identificación y recuperación del equipo. Por último, se valida el adecuado funcionamiento y la confiabilidad del sistema de medición.
Entomología médica
MEJ Acero,Edgar Díaz-Rivera,Gabriel A. Tafur,Gabriel Jaime Parra-Henao
Biomédica , 2011,
Abstract:
INYECCIóN DE COLOR CARAMELO AL AZúCAR DE CA A EN SU PROCESO DE ELABORACIóN
EDISON HENAO CASTA?EDA,ALEXANDER DíAZ ARIAS,DANNY CARDONA CUELLAR
Scientia Et Technica , 2009,
Abstract: En el Ingenio Risaralda, como en otros ingenios de Colombia donde se produce azúcar crudo (moscabado), se realza el color del producto mediante la adición de colorantes naturales, sin lograr un color uniforme del azúcar a lo largo del proceso debido a la ausencia de un método que permita su aplicación sin afectar el procesamiento de otros productos. En este artículo se presenta el dise o de un sistema para la inyección del color caramelo durante el proceso de descarga de las centrífugas utilizando el árbol de lavado y soluciones mediante componentes eléctricos y neumáticos.
Solución al problema combinado de ubicación estratégica de almacenes y asignación de inventarios usando técnicas heurísticas
LUIS FERNANDO MORENO VELáSQUEZ,JUAN DAVID VELáSQUEZ HENAO,FRANCISCO JAVIER DíAZ SERNA
DYNA , 2005,
Abstract: El problema combinado de ubicación de almacenes y asignación óptima de inventarios es bastante difícil de plantear y resolver por métodos analíticos. Se busca determinar los almacenes que deben seleccionarse de un conjunto dado, así como los inventarios asociados a cada uno de ellos, para atender la demanda de un conjunto de artículos con un nivel de confianza dado. En este artículo se presenta un análisis del planteamiento del problema para atender la demanda de repuestos y dos metodologías heurísticas de solución. La primera, propuesta por los autores y llamada Búsqueda Exhaustiva con Poda, BEP, es basada en el recorrido del espacio de soluciones, eliminando durante la ejecución del algoritmo aquellas que sean dominadas, la cual puede ser usada en problemas con un número moderado de almacenes; y la segunda corresponde a la Búsqueda Tabú, la cual se usa cuando la BEP no se hace apropiada. Se realiza una comparación de ambas metodologías.
EFECTO DE LA ADICIóN DE PLASMA SEMINAL SOBRE LA ELIMINACIóN DE GOTAS CITOPLáSMICAS EN SEMEN DE SUS SCROFA LINAEUS, 1758
Henao Uribe,Francisco Javier; Valencia Giraldo,Julián Alonso; Díaz Franco,Orlando; Rangel Sierra,Marcos Yesid;
Boletín Científico. Centro de Museos. Museo de Historia Natural , 2011,
Abstract: the cytoplasmic droplets (cds) are remnants of the cytoplasm that are attached to the sperm after spermatogenesis. cds constitute the most frequent sperm abnormality in pigs and are clearly related to low fertility. there are serious indications that fructose and the seminal plasma ampc are involved in sperm maturation in the cds detachment and in the acrosome reaction. the objective of this study was to evaluate the effect of the addition of seminal plasma in the cds detachment in males with diagnosis of persistence of such detachment. three boars (two with persistence of cds and one normal) from three to five years of age, housed in the montelindo farm at universidad de caldas were used in the study. these boars were performed complete seminal analysis weekly during four months. a factorial arrangement 3x3x2 (addition to the males fr with cds persistence of 0%, 20% of sphm and 20% of spmcds; 0, 60 and 120 minutes incubation, and 16, and 37oc incubation temperature) was carried out in a randomized complete blocks design, analyzed through variance analysis and tukey's test. incubation of males semen with persistence of cds with spmcds decreased more than 4% the cds with regards to incubation without sp and sphm; similarly, there was reduction of approximately 5% in cds when increasing incubation time from 0 to 120 minutes, and about 2% when increasing incubation temperature from 16 to 37oc.
THE NEED FOR CONGESTION PRICING IN MEDELLIN: AN ECONOMIC PERSPECTIVE
GONZáLEZ-CALDERóN,CARLOS A.; POSADA HENAO,JOHN JAIRO; SáNCHEZ-DíAZ,IVáN DARíO;
DYNA , 2012,
Abstract: this paper presents a brief description of vehicular congestion in medellin, colombia, and discusses the need to implement congestion pricing (cp) from an economic point of view. it describes the license plate-based traffic restriction (pico y placa) in the city, showing that the measure is palliative, and that the implementation of cp is necessary. a cost-benefit analysis is presented to assess the effects of implementing a hypothetical cp strategy based on data from previous studies. the first-best solution for cp is presented, and considered as the optimal policy for deciding on the congestion rate that would maximize social welfare. the main finding is that the net benefit of implementation costs is positive. therefore, the implementation of a cp strategy is recommended to improve the efficiency of road infrastructure use in the city based on economic principles. finally, a set of recommendations for improving the city's mobility in the future are presented.
EVALUACIóN DE DOS MEDIOS DE CULTIVO Y HEREDABILIDAD DE PRODUCTIVIDAD Y TIEMPO DE DESARROLLO PARA TRES MUTANTES DE Drosophila melanogaster (DROSOPHILIDAE)
DíAZ-GONZáLEZ FERNANDO,PIZARRO-LOAIZA MAYRA,RAMíREZ-CASTRILLóN MAURICIO,MOLINA-HENAO YHERSON
Acta Biológica Colombiana , 2008,
Abstract: Con el objetivo de investigar el efecto del medio de cultivo en la productividad y tiempo de desarrollo huevo-adulto de una cepa silvestre y tres cepas mutantes (CyLv, vg, w) de Drosophila melanogaster, se examinaron dos tipos de medios: banano y naranja. Para esto se empleó un dise o con dos factores, medio de cultivo y tipo de cepa, para un total de ocho tratamientos con cinco repeticiones cada uno. Se obtuvo que la productividad y el tiempo de desarrollo dependen del medio de cultivo y el tipo de cepa, encontrándose mayor productividad en el medio de naranja. La cepa silvestre presentó la mayor productividad y el menor tiempo de desarrollo en los dos medios (α=0,05). El análisis genético evidenció una heredabilidad baja y una variación fenotípica debida en su mayor parte al componente de interacción genotipo-ambiente, lo que explica la diferencia en el patrón de productividad y tiempo de desarrollo entre medios de cultivo.
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