Departamento de Física: Recent submissions
Now showing items 41-60 of 157
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Propositional calculus and binary calculus
(Universidad Nacional [Costa Rica], 1990-01-01)We present an efficient method of propositional calculus which allows the manipulation of logical functions with an arbitrary number of propositional variables. This method is base on the use of binary sequences (in other ... -
Una propuesta metodológica para facilitar el proceso enseñanza-aprendizaje de los estudiantes para el tema "Leyes de Newton"
(Universidad Nacional (Costa Rica), 2005)La enseñanza del tema sobre las Leyes de Newton, ha sido y es, un tabú entre la población estudiantil, basta con escuchar los comentarios que sobre el mismo realizan los estudiantes. En este trabajo se propone una nueva ... -
M2 Currents And Residual Flow In The Gulf Of California
(Elsevier, 1992)The full nonlinear, vertically-averaged equations of motion are time integrated through a finite difference scheme on a regular grid that reproduces the topography of the Gulf of Califor nia with a mesh size of 14 ... -
Experimental And Theoretical Analysis Of A Simple Solar Oven In The Climate Of Costa Rica - I
(Elsevier, 1988)Inexpensive and easy to fabricate solar ovens have been made with available materials. One reflector has also been mounted to increase the input radiation on the hot absorbing plate which can be adjusted manually according ... -
Líneas ciclotrónicas en el espectro de rayos y pulsado
(Universidad Nacional [Costa Rica], 1989-01-01)Si el proceso de Bremsstrahlung magnético es el responsable de las líneas observadas en los espectros de dos estallidos de rayos y, GB880205 y GB870303 detectados por el espectrómetro del satélite GINGA, entonces los ... -
La radiación de frenado en campos magnéticos fuertes
(Universidad Nacional [Costa Rica], 1989-01-01)Presentamos un análisis de las funciones de transición de Bremsstrahlung en función de la polarización de espín total del electrón a lo largo del campo magnético externo y la polarización lineal o circular de la radiación ... -
Feasibility of dose enhancement assessment: preliminary results by means of Gd-infused polymer gel dosimeter and Monte Carlo study
(Universidad Nacional (Costa Rica), 2018)This work reports the experimental development of an integral Gd-infused dosimeter suitable for Gd dose enhancement assessment along with Monte Carlo simulations applied to determine the dose enhancement by radioactive ... -
Effectiveness of N-waves for predicting morphological changes due to tsunamis
(Elsevier, 2018)The research on morphological changes caused by tsunamis has increased considerably in the last few years, yet the processes behind this phenomenon are still not fully understood. This paper analyzes and compares numerical ... -
Economic Analysis Of Domestic Solar Still In The Climate Of Costa Rica
(Universidad Nacional (Costa Rica), 1990)-In many communities of the developing countries, including Costa Rica and especially in coastal areas, there exists a shortage of potable water. Taking into account the fact that transportation/distribution of potable ... -
Dinámica y estructura poblacional del camarón de aguas someras Penaeus (Farfantepenaeus) notialis, en el Caribe colombiano con fines de manejo y conservación
(Universidad Nacional (Costa Rica), 2021)The Penaeus (Farfantepenaeus) notialis species supports the industrial shallow-water shrimp fishery in the Colombian Caribbean. Since 1986 a state of overexploitation was reached, worsened in 1996, leading to a drastic ... -
Lepidochelys olivacea status and its relationship with nest management on the eastern coast in the Pacifico of Guatemala
(Universidad Nacional (Costa Rica), 2021)Marine turtles are reptiles that have lived in the Earth’s oceans and nested on the beaches starting several million years ago and also have coexisted with coastal communities since humans colonized beach areas across the ... -
Diseño de una metodología para evaluar el manejo sostenible de los bosques naturales de la Zona Norte, Costa Rica
(Universidad Nacional (Costa Rica), 2021)A partir de un conjunto de indicadores de referencia, se diseñó una herramienta para la evaluación “ex post” de la sostenibilidad de unidades de bosques naturales manejados en Costa Rica. Este conjunto se desarrolló ... -
Comparative Study Of Conventional And Sbci Cardboard Solar Ovens
(Elsevier, 1992)Two folding and light solar ovens designed and constructed by Solar Box Cookers International (SBCI), Sacramento, U.S.A., have been studied experimentally. Furthermore, their performance is com pared with standard two ... -
Dairy wastewater treatment by anaerobic fixed bed reactors from laboratory to pilot-scale plant: A case study in Costa Rica operating at ambient temperature
(Springer, 2013)The effect of hydraulic retention time in a range from 1.0-5.5 days was evaluated in a laboratory scale anaerobic fixed bed reactor packed with a hybrid material composed of tire rubber and zeolite. Under these conditions, ... -
Design, construction and experimental study of electric cum solar oven-II
(1989)As in many developing countries,35-401 of the population of Costa Rica still use firewood for domestic cooking.Considering the fact that Costa Rica is blessed with good sunshine,good hydroelectric potential,and there ... -
Design, construction and study of a hybrid solar food processor in the climate of Costa Rica
(Elsevier, 2007)During the last 25 years, the author has designed, constructed, studied and promoted solar oven, hybrid solar/electric oven, solar oven cum drier, solar cooker cum water heater and solar still. In different parts of the ... -
Desarrollo de herramientas metrológicas avanzadas para la caracterización de nanomateriales: aplicación a la síntesis sonoquímica de nanopartículas de plata
(Instituto Tecnológico de Costa Rica, 2021)En la última década, el crecimiento de la innovación en el campo de la nanociencia y la nanotecnología ha sido exponencial. Específicamente, se han logrado avances notables en el desarrollo de nanomateriales de ingeniería. ... -
An evaluation of variables affecting the stability and performance of down-flow anaerobic fixed bed reactors treating piggery wastewater
(Taylor & Francis, 2006)The influence of the most important variables on the stability and performance of down-flow anaerobic fixed bed reactors treating piggery wastewater after primary sedimentation was evaluated at HRT in the range of 1-6 d ... -
High Specific Capacity of Lithium–Sulfur Batteries with Carbon Black/Chitosan- and Carbon Black/Polyvinylidene Fluoride-Coated Separators
(MDPI, 2022-03-17)In this research, the shuttle effect and the low sulfur activation of lithium–sulfur batteries were mitigated by coating the cathode side of Celgard 2400 separators with mixtures of carbon black/chitosan or carbon ... -
Aplicaciones del modelo de Barbaro et al. para el cálculo de la radiación solar global por medio de estimaciones de los componentes directos y difusos, en Limón y Puntarenas, Costa Rica, para el período 1970-1972
(Universidad Nacional (Costa Rica), 1987-01-01)El presente trabajo utiliza un modelo atmosférico propuesto por Barbaro et al., para el cómputo de la radiación solar global a través de las estimaciones de las componentes directa y difusa, en Limón y Puntarenas, Costa ...