Producción Académica: Envíos recientes
Mostrando publicaciones 3441-3460 de 3943
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A preliminary investigation into the effects of active interferential current therapy and placebo on pressure pain sensitivity: A random crossover placebo controlled study
(2011)Objective (1) To determine the effect of active and placebo interferential current on muscle pain sensitivity using an experimental mechanically induced pain model. (2) To evaluate the predictive role of expectations, ...
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Organizational improvement through standardization of the innovation process in construction firms
(2012)The purpose of this article is to identify the drivers, success factors, benefits, and barriers to innovation in a medium size construction firm with a standardized innovation management system. The case study method is ...
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Modeling pulse infectious events irrupting into a controlled context: A SIS disease with almost periodic parameters
; Cordova-Lepe, Fernando
; ; (2012)
A new epidemic model of seasonal/cyclical pulse contagions of an infectious disease is introduced: a population with a controlled infectious disease is perturbed by a sequence of pulse infectious events arising from the ...
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Source–sink impulsive bioeconomic models: Seasonal closures with fixed length
; ; Cordova-Lepe, Fernando (2011)
The dynamics of four source–sink models for an exploited resource under a constant fishing effort are here presented. Two models are described by ordinary differential equations; the other two are expressed by impulsive ...
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A new class of differential equations with impulses at instants dependent on preceding pulses. Applications to management of renewable resources
Cordova-Lepe, Fernando; ; (2012)
In this paper, a new type of mathematical model to represent certain processes with impulsive dynamic behavior is introduced. The main assumption is that the next impulse time is determined by three fundamental elements: ...
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In vitro Propagation of Cedar (Cedrela odorata L.) from juvenile shoots
; ; ; ; ; ; ; Quiroz, Karla (2011)
Cedrela odorata L. is one of the most important timber species currently traded in the Caribbean and Central America; however, it has been intensively exploited. In vitro techniques and clonal propagation can help to ...
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Structural characterization and dielectric properties of the solid solutions AgPb(Sb,Bi)S3
(2012)The new solid solutions AgPbSb1−xBixS3 were prepared by solid state reactions. The phases were characterized by powder X-ray diffractions (XRD), scanning electron microscopy, and thermal analysis. The XRD patterns of ...
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A pulse fishery model with closures as function of the catch: Conditions for sustainability
Cordova-Lepe, Fernando; ; (2012)
We present a model of single species fishery which alternates closed seasons with pulse captures. The novelty is that the length of a closed season is determined by the remaining stock size after the last capture. The ...
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Colloidal carbon stimulation of Kupffer cells triggers Nrf2 activation in the isolated perfused rat liver
(2012)Activation of transcription factor Nrf2 was investigated in the isolated perfused rat liver infused with 0.5 mg of colloidal carbon (CC)/ml for 5–15 min to stimulated Kupffer cell function. Infusion of CC enhanced liver ...
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Hydrogen peroxide induced phenylpropanoids pathway eliciting a defensive response in plants micropropagated in temporary immersion bioreactors (TIBs)
(2012)The relation between the oxidative burst and phenylpropanoid pathways has been studied using the sugarcane cultivar C86-56, which does not release phenolics in agar-base micropropagation systems. In stationary liquid ...
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On uniqueness of semi-wavefronts: Diekmann–Kaper theory of a nonlinear convolution equation re-visited
(2012)Motivated by the uniqueness problem for monostable semi-wave -fronts, we propose a revised version of the Diekmann and Kaper theory of a nonlinear convolution equation. Our version of the Diekmann–Kaper theory allows (1) ...
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Sugar cane bagasse prehydrolysis using hot water
abril, diana; ; (2012)
Results are presented on the hot water prehydrolysis of sugar cane bagasse for obtaining ethanol by fermentation. The experimental study consisted of the determination of the effect of temperature and time of prehydrolysis ...
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Dimensiones que caracterizan el consumo potencial de alimentos orgánicos en la Región del Maule, Chile
(2011)La demanda creciente por alimentos orgánicos presenta ventas por encima de los cinco mil millones de dólares por año a nivel mundial. Esta demanda también se extiende a los países en desarrollo como es el caso chileno, ...
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Thyroid hormone-induced cytosol-to-nuclear translocation of rat liver Nrf2 is dependent on Kupffer cell functioning
(2012)L-3,3 ,5-triiodothyronine (T3) administration upregulates nuclear factor-E2-related factor 2 (Nrf2) in rat liver, which is redoxsensitive transcription factor mediating cytoprotection. In this work, we studied the role of ...
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El hijo del hombre joánico. Una teología del martirio y de la exaltación
Carbullanca Nuñez, César (2012)
El artículo desarrolla las características fundamentales de la cristología joánica del Hijo del hombre y explica los principales aspectos presentes en los dichos relativos a esta fi gura, sosteniendo que estos provienen ...
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El transcurrir de la infancia en escuelas de frontera. El caso de dos escuelas rurales de la región del Maule en Chile
Ferrada, Donatila; Schilling Lara, Caroll Alejandra (2017)
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Identificación de constructos competitivos y estratégicos de las exportaciones de manzanas chilenas a los mercados asiáticos
(2012)En esta investigación se analiza la competitividad de las exportaciones de manzanas de la región del Maule, Chile, en los mercados asiáticos de China, Hong Kong, Taiwán e India. El objetivo fue identificar estrategias ...
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Investigación participativa dialógica
Ferrada, Donatila (2017)
La investigación dialógica-kishu kimkelay ta che, se configura como una forma de construir conocimiento colectivo desde la constitución de comunidades de investigación, las que deciden en conjunto qué, para qué y cómo ...
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Impacto de actividades lúdicas no competitivas sobre las habilidades motoras gruesas en niños y niñas pre escolares
Vargas, Rodrigo; (2013)
Este estudio se centra en el impacto de las actividades lúdicas no competitivas de las habilidades gruesas en niños(as) prebásico. Se consideró una metodología lúdica con carácter no competitivo y la aplicación de un pre ...
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Adaptación y rendimiento escolar de los alumnos de cuarto año medio de liceos científicos humanistas públicos de Curicó, Chile
(2013)El presente reporte se enmarca dentro de una investigación básica, de carácter descriptivo correlacional, acerca de las características de Adaptación Personal, Adaptación Social y las notas de enseñanza media, de los ...