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Now showing items 479-498 of 13278
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Analysis of energy transfer and ternary non-covalent filler/matrix/UV stabilizer interactions in carbon nanofiber and oxidized carbon nanofiber filled poly(methyl methacrylate) composites
(Elsevier, 2011-10-27)Ternary non-covalent interactions between carbon nanofibers (CNFs), oxidized carbon nanofibers (ox- CNFs), poly(methyl methacrylate) (PMMA) chains, and benzotriazole-containing UV stabilizers were analyzed using ... -
Analysis of non-covalent interactions between the nanoparticulate fillers and the matrix polymer as applied to shape memory performance
(The Royal Society of Chemistry, 2010)Non-covalent interactions between filler particles and polyurethanes were investigated using fluorescence emission spectroscopy. The results were used in the analysis of shape memory (SM) performance of polyurethanes. ... -
Analysis of ORF5 sequences of Porcine Reproductive and Respiratory Syndrome virus (PRRSV) circulating within swine farms in Costa Rica
(BMC Veterinary Research, 2021-06-12)Background: Worldwide, Porcine Reproductive and Respiratory Syndrome (PRRS) is among the diseases that cause the highest economic impact in modern pig production. PRRS was first detected in Costa Rica in 1996 and has since ... -
Analysis of seismic and acoustic observations at Arenal Volcano, Costa Rica, 1995–1997
(Elsevier Science, 2000-08)In November 1995, we installed five, three-component broadband seismometers and electronic tiltmeters around the circumference of Arenal Volcano, a young stratovolcano in Costa Rica that exhibits strombolian activity. With ... -
Analysis of TcdB proteins within the hypervirulent clade 2 reveals an impact of RhoA glucosylation on Clostridium difficile proinflammatory activities
(Infection and Immunity, 2016-03)Clostridium difficile strains within the hypervirulent clade 2 are responsible for nosocomial outbreaks worldwide. The increased pathogenic potential of these strains has been attributed to several factors but is still ... -
Analysis of test day yield data of Costa Rican dairy cattle
(Elsevier, 1998)Estimates of variance components for test day records in an animal model that considered multiple traits over multiple lactations were calculated using REML methodology. Test day records were classified into 11 periods ... -
Analysis of the association between density of Helicobacter spp and gastric lesions in dogs
(American Journal of Veterinary Research, 2017-12)OBJECTIVE To evaluate the correlation between the density of native gastric Helicobacter spp and the presence of gastric lesions in dogs. ANIMALS 80 dogs of various breeds, sexes, and ages. PROCEDURES Gastroscopic and ... -
Analysis of the contaminant “microplastics” in marine and freshwater ecosystems in the World Heritage Site Cocos Island National Park, Costa Rica
(Universidad Nacional (Costa Rica), 2023) -
Analysis of the contributions of National Parks and Biological Reserves to the socioeconomic development of Costa Rica, 2009.
(Universidad Nacional, Costa Rica, 2010-07)Costa Rica has a quarter of its territory protected, of which 12.7% corresponds to the category of national parks and biological reserves. These protected areas-a total of 28 national parks and biological reserves in- ... -
Analysis of the educational resources used in the course Fundamentals of Informatics in the face of the COVID-19 pandemic
(Universidad Nacional (Costa Rica), 2022)Technology brought several advancements to the Educational area in the past few years, including digital resources such as Open Educational Resources (OER). However, higher demand associated with the lack of platforms that ... -
Analysis of the effect that current grammar instruction and evaluation techniques has on the tenth graders’ communicative written performance at Perez Zeledón public high schools
(Universidad Nacional (Costa Rica). Escuela de Literatura y Ciencias del Lenguaje., 2010)Analiza la relación entre la enseñanza y la evaluación de la gramática en el aula, y el desempeño en la escritura para fines comunicativos de estudiantes de décimo año en cuatro colegios públicos en Pérez Zeledón. Dentro ... -
Analysis of the HDG method for the stokes–darcy coupling
(Numerical Methods for Partial Differential Equations, 2017-02-03)In this article, we introduce and analyze a hybridizable discontinuous Galerkin (HDG) method for numerically solving the coupling of fluid flow with porous media flow. Flows are governed by the Stokes and Darcy equations, ... -
Analysis of the influence of GLONASS signals in the processing of one regional geodestic Network
(Universidad Nacional, Costa Rica, 2018-01-31)In recent years, there has been an increase in the number of satellites available for positioning using space techniques, highlighting the GPS and GLONASS systems. The comparative analysis of the results ... -
Analysis of the Interactions Between Humans and Crocodiles in Costa Rica
(Sociedade Brasileira de Herpetologia, 2020)The habitat of crocodiles (Crocodylus acutus) and caimans (Caiman crocodilus) has been subjected to pressure due to human expansion. Habitat reduction, coupled with the simultaneous growth of the crocodile population, ... -
Analysis of the listening instruction of second cycle EFL students at Peñas Blancas Primary School: a research study
(Universidad Nacional, Costa Rica, 2015)Enhancement of the listening skill for students of English as a foreign language is seen as a priority during the elementary school years in the context of Costa Rican public schools. Since little research has been carried ... -
Analysis of the most common causes of viscera condemnation in pigs (liver, kidney, heart), in a slaughterhouse of Costa Rica, and its economical implication
(M. & H. Schaper GmbH & Co., 2011)This is an analysis of the causes and costs of rejection of viscera from the daily post-mortem meat inspection records from a slaughterhouse located in the Metro politan area of the Central Valley. The records examined ... -
Analysis of the Socio-economic Contributions of Rincon de la Vieja national park “Conservation with Soul of Volcano” World Natural Heritage Site UNESCO 2009
(Universidad Nacional, Costa Rica, 2001-07)The Project Systematization and Analysis of the Contributions of National Parks and Biological Reserves to the Economic and Social Development in Costa Rica, Benin and Bhutan is executed under the Program of South-South ... -
Analysis of the Socio-economic Contributions of Corcovado National Park and Caño Island Biological Reserve : The biological, archaeological, cultural richness of the South Coast mediated by the dynamism of its villagers, 2008
(Universidad Nacional, Costa Rica, 2010)Costa Rica has distinguished itself as a country that considers the nature and natural resources as vital factors to their socio-economic development. However, few studies-and partially-systematize and quantify the ... -
Analysis of the Socio-economic Contributions of Palo Verde national park “A nest for Research and Education” 2009
(Universidad Nacional, Costa Rica, 2010-07)The Project „‟Systematization and Analysis of the Contributions of National Parks and Biological Reserves to the Economic and Social Development in Costa Rica, Benin and Bhutan’’ was developed by CINPE and executed under ... -
Analysis of the threat of groundwater contamination in the Jacó aquifer, Central Pacific, Costa Rica
(Universidad Nacional (Costa Rica), 2021-07-01)[Introduction]: In Costa Rica, more than 70 % of the public drinking water supply comes from groundwater sources. In the coastal city of Jacó, on the Central Pacific Coast of Costa Rica, tourism activity ...