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Environmental heat stress is the result of ambient temperature, radiation, and relative humidity. During football practice on synthetic surfaces and no roof, solar radiation causes an important temperature increase of the playing surface. This technical note explains how heat stress is calculated according to the WBGT index (which does not consider playing surface temperature), and quantifies the increase in a synthetic surface compared to natural grass on the same site. Football practice should be avoided during those hours with the highest solar radiation and temperature on this type of surface.

En esta nota se ofrecen las razones por las cuales se deben elaborar artículos científicos construidos de acuerdo con las normas internacionales establecidas y los principios de rigurosidad y originalidad necesarios para que sean aprobados por los árbitros especialistas en el campo. Además, se desarrollan varias ideas relacionadas con la ética del escritor, destacando las buenas prácticas y aclarando lo que no debe hacerse. Se concluye que solo con buenos artículos, los profesionales e investigadores costarricenses pueden contribuir a mejorar los aportes científicos y profesionales que se puedan generar en el país. De igual manera, las revistas científicas costarricenses mejorarán su visibilidad y aportes a la ciencia mundial.

This paper offers a critical biography revealing certain historical intersections and divisions between Western art and science and points to specific moments where they have worked together through an exclusionary version of liberal humanism. This version of liberal humanism was often constructed through the dehumanization of women, people of color, people with disabilities and sexual minorities who were relegated to the non-human, the almost human, the animal or the monstrous. As part of the methods, it offers a critical genealogy, sifting through the cultural vestiges of art, science, philosophy, medicine, atlases, illustrations, colonial and eugenic discourses, feminist, queer, and postcolonial theories, and visual culture in order to recover and reconstruct specific connections between art and science in different historical periods (from the late 1400so the present). By drawing attention to the fact that "the human" has been a shifting and unstable signifier, this paper concludes that both Western art and science have the ability to help co-construct humanity by formulating new more equitable assemblages or the power to magnify already existing power disparities. [ABSTRACT FROM AUTHOR]

This article explores how violence conditions the use of public transportation is the main objective of this paper. Specifically, the paper asks if individuals from diverse social strata differently refrain from using public transportation due to security concerns. The paper is based on an analysis of the National Survey on Victimization and Perception of Public Security 2018, carried out by the National Bureau of Statistics (inegi). The paper shows that individuals from upper stratum are two times more likely to stop using public transportation due to security concerns compared with individuals from lower stratum. [ABSTRACT FROM AUTHOR]

This paper presents and analyzes socio-communitarian rural processes in the Provinces of Buenos Aires and Chaco, Argentina, documented from 1991 and 2015 -respectively-through a collaborative ethnographys approach and using sociolinguistic methodologies. In order to build a theoretical framework, these disciplines are put in relationship to other areas of knowledge i.e., philosophy, social psychology and sociology. In doing so, it is possible to uncover and interpret actions that otherwise remain invisible, such as singular processes of subjectivation, the creation of coalitions and the struggle against the obliteration of life. [ABSTRACT FROM AUTHOR]

In this paper, we engaged in dialogue with a Gnöbe community leader, who was also a teacher of English, so to analyze how the Quinquennial Plan for Indigenous Peoples in Costa Rica (QPIP) caters to the needs and goals of the indigenous students enrolled in the Bachelor’s in English Teaching at Universidad Nacional, Coto Campus. The efforts made by the university authorities and the associate faculty during the implementation of the QPIP had previously been scrutinized—unraveling that the objectives of the plan have partially been met and that more courses of action are required to ensure successful outcomes (Fallas & Brand, forthcoming). By examining the interview conducted with the participant of the study, based on tenets of the Narrative Approach, we shed light on the hardships faced by Gnöbe students in the education system, the circulating discourses held by First Nation Communities regarding education and bilingualism, and the solutions proposed by the community stakeholder to alleviate the problems encountered by QPIP students in their college life. We finish this paper by translating the leader’s voice into applicable suggestions that may help professors of the English Department and the administration of the university retain indigenous students by promoting more culturally relevant pedagogies geared to their academic success and development of their cultural identity and affiliation.

This paper describes the implementation of different techniques in the English class. Those techniques are taken and adapted from the methodology of Toastmasters International Club. The authors have adapted this methodology in order to improve their students’ English performance, which has proven to be effective in the foreign language classroom. Therefore, this paper details Toastmasters techniques in two groups of the Pacific Regional Center of University of Costa Rica: freshmen from the Major of English with Business Management Training and juniors from the English Teaching Major. The authors developed different techniques depending on the students’ level and course objectives and have concluded that this methodology can provide valuable resources to improve English in the classroom.

In this paper, we scrutinize the extent to which authorities and professors from the Coto Campus, Brunca Extension, have orchestrated efforts to ensure the successful implementation of the Quinquennial Plan for the Indigenous Peoples in Costa Rica (QPIP). We focus on examining the experiences of three Gnöbe students enrolled in the B.A. in English Teaching offered at the Coto Campus and on analyzing the perceptions of professors and the administration regarding the implementation of the QPIP. Data collected by means of interviews, questionnaires and focus groups suggest that the objectives of the QPIP have been only partially met and that further efforts are needed to ensure its successful implementation. We finish this paper by translating the students’, professors’ and administration’s concerns into concrete suggestions geared towards securing the success of the QPIP.

This paper reviews how we arrived at the current state of affairs in the ethical practice of scientific research, discussing some issues that are particularly pertinent to the exercise scientist. The paper focuses on two major areas of ethics in science. The ethical principles for biomedical research involving human subjects are presented and discussed using the three basic principles from the Belmont Report (autonomy, beneficence, and justice) as a guide. The ethical presentation and publication of data are discussed as an update or expanded comment on the ten topics covered by Roy Shephard in his Ethics in Exercise Science Research paper from 2002. The manuscript closes with a reflection on personal responsibility and its importance in every scientific endeavor: placing all responsibility for action on those scientists or physicians doing the experiments was not sufficient to prevent all types of human research abuses in the first half of the twentieth century. However, intricate and cumbersome external review and approval procedures generate the perception that the system should be more than enough to ensure good practices, a perception that may dangerously prevent the scientists from assuming their individual responsibility.

In this paper, we study the uniqueness of two difference polynomials of entire functions sharing one value, polynomial and small function. Our results of this paper are improvement of the previous theorems given by Chen and Chen [2], Liu, Liu and Cao [22] and Li et al. [19].

The method of ordinary differential equations in the context of calculating the special functions of wave catastrophes is considered. Complementary numerical methods and algorithms are described. The paper shows approaches to accelerate such calculations using capabilities of modern computing systems. Methods for calculating the special functions of wave catastrophes are considered in the framework of parallel computing and distributed systems. The paper covers the development process of special software for calculating of special functions, questions of portability, extensibility and interoperability.

This article concentrates on Rabindranath’s reception in a few Latin American countries. In the history of Latin America, early twentieth century was a crucial time when various Latin American countries were striving to come out of Europe’s grasp and establish an identity of their own. Yet, in the multifarious and multiracial society of Latin America it was difficult to define their ‘own’. At such a critical juncture of history, Rabindranath represented an alternative to various Latin American authors. He was, to them, a representative of a British colony who had been recognised and acknowledged by Europe, and thus symbolized a power/knowledge equivalent to that of Europe. This paper, divided in three parts, explores this reception and its impact, firstly by analyzing the history of the direct contact; then by focusing on the Latin American translations of Rabindranath’s works; and finally, by re-reading a few essays and critical-writings on Rabindranath. Among others, the paper alludes to Victoria Ocampo (1890-1979), the first and perhaps the only Latin American author who came in direct contact with Rabindranath; and some of the most important Nobel Laureates of Latin America, like Gabriela Mistral (1889-1957) and Pablo Neruda (1904-1973), to show how these authors and poets received Rabindranath in their own contexts. Este artículo se concentra en la recepción de Rabindranath Tagore en algunos países de América Latina. En la historia de este continente, los primeros años del siglo XX fueron cruciales, porque muchos países de América Latina estaban esforzándose por destruir el control de Europa y establecer una identidad propia. Sin embargo, era difícil definir “lo propio” en una sociedad tan múltiple y multirracial. En un momento tan complejo de la historia, Tagore personificaba una alternativa para algunos autores de América Latina. Él era como un representante del “tercer mundo” que había ganado el reconocimiento de Europa, de los colonizadores; por tal motivo, su poder/sabiduría era tan fuerte como el de los británicos. Este artículo, dividido en tres partes, busca primero explorar la historia del contacto directo entre el poeta hindú y algunos escritores latinoamericanos; segundo, analizar varias traducciones de las obras de Tagore, hechas por latinoamericanos; y, finalmente, discutir unos ensayos y textos críticos realizados por estudiosos de América Latina sobre Tagore. El artículo se centra en Victoria Ocampo (1890-1979), la única autora del mundo hispano con quien Tagore tenía un contacto directo, y también en poetas de nombre mundial como Gabriela Mistral (1889-1957) y Pablo Neruda (1904-1973), para explicar cómo ellos recibieron a Tagore.

Abstract Specialized Scientific historiography in Freemasonry is a recent development, starting in France in the 1950 and 1960’s, in Spain in the 80’s and in Latin America since 2000.This young scientific community currently needs a critical historiographical review. This movement is necessarily collective one and is essential in providing useful guidance for future researchers. This paper is part of this process. Since Freemasonry is the founding prototype of the international public opinion (or international public spaces), masonic networks rely on a global history, referring not only to the analysis of contemporary international relations but also to public opinion and civil society studies. How does general history academia –and, especially, “world history”- deal with the masonic question? What are their favorite perspectives and historical periods? The paper is the first in a series aimed at evaluating the position Freemasonry holds in general history, it focuses on some representative "world history” works: the History of Public Opinion by Jürgen Habermas, the English speaking World History, Eric J. Hobsbawm three volumes of the 19th and 20th Centuries and the General History of the Nineteenth Century by Robert Schnerb.

Fuel demand during the last 50 years in Costa Rica has increased constantly. Do the price of fuels and Gross National Income contribute to explain these trends? This paper explores the existence of causal relations between economic growth, fuel price, and transport demand (represented by fuel consumption and registered vehicles). Vector autoregression (VAR) models were estimated with a time series of data of 1965-2019. Causal relations were found between fuel demand and income, but not with registered vehicles. The effect of price on demand and income were documented, which is important for policy formulation (in particular, possible taxation of fuel demand as a carbon mitigation strategy).gation strategy.

El presente trabajo describe petrográfica y genéticamente, una serie de hallazgos de peperitas como ejemplos de coexistencia espacial y temporal del magmatismo con la sedimentación en Costa Rica. Los casos se presentan en complejos ígneos básicos (ofiolitas) variando desde mezclas incompletas (megabloques de radiolaritas con diabasas en el Complejo de Nicoya) hasta mezclas completas en varios grados de calizas pelágicas del Maastrictiano-Paleoceno (Formación Golfito) o del Paleoceno con basaltos (Subcomplejo Quepos o Formación Tulín) para dar peperitas brechoides y bulbosas. Dentro del arco Oligo-Mioceno, se tienen ejemplos a lo largo de la cordillera de Talamanca y sus estribaciones, así como en las llanuras de Sarapiquí, representados por peperitas brechoides, fluidales y bulbosas en cuerpos de lava latiandesíticos (Formación Pacacua) o chimeneas peperíticas brechoides en ignimbritas (Miembro Mata de Limón), o posibles peperitas brechoides en los depósitos de flujos de lava del prospecto minero de Crucitas (Formación Cureña), o simples posibles peperitas brechoides en flujos de lava andesíticas (Formación Pacacua en Talamanca), o como brechas hidroclásticas con fragmentos de composición dacítica de Carbonal en Guanacaste, justamente entre las playas Cabuyal y Naranjo. Todas ellas serían los equivalentes proximales del vulcanismo explosivo, efusivo y subvolcánico (domos endógenos y criptodomos) y su concomitancia con la sedimentación fluvial. En el Cuaternario, un ejemplo se da en la base de la Formación Tiribí al contacto con el lacustre de Palmares. Se incluyen en el presente trabajo, además, casos posibles o potenciales. Se espera que la descripción e interpretación de este tipo de rocas ayude a su identificación en otras regiones de Costa Rica y Centroamérica en general, así como una fuente potencial para la prospección de metales valiosos.This paper describes petrographically and genetically, a number of peperites, as examples of spatial and temporal coexistence of magmatism and sedimentation in Costa Rica. The cases are presented in basic igneous complexes (ophiolites), mixtures varying from incomplete (megablocks of radiolarite with diabase in the Nicoya Complex) to complete mixes in various stages of Maastrichtian-Paleocene (Golfito Formation) or Paleocene pelagic limestones with basalts (Quepos Subcomplex or Tulín Formation) to form brechoid and pillowed peperites. Within the Oligo-Miocene arc, there are examples extended along the Talamanca range and its foothills, as well as Sarapiquí’s plains represented for brechoid and bulbous (fluidal) peperites in latiandesitic lavas (Pacacua Formation) or brechoid peperitic pipes in ignimbrites (Mata de Limón Member) or possible brechoid peperites in lavas in the Crucitas mining prospect (Cureña Formation), or simple brechoid peperites in andesitic flow (Pacacua Formation, in Talamanca) or as hydroclastic breccias with fragments of dacitic composition in lava flow deposits of Carbonal Guanacaste, just between the beaches Cabuyal and Naranjo. All these rocks represented proximal equivalents of the explosive, effusive and subvolcanic volcanism (endogenous domes and criptodomes) and his concomitance with the fluvial sedimentation. In Quaternary period, we have a sample in the base of Tiribí Formation in contact with Palmares Lacustrine. Also this paper included possible and potential cases. It hopes that the description and interpretation of this type of rocks helps to its identification in other regions of Costa Rica and Central America in general, as well as a potential source for the exploration of valuable metals.

Isla del Coco, Pacífico de Costa Rica, ha sido visitada y se ha escrito sobre ella desde el Siglo XVI. Desde finales del Siglo XIX muchas expediciones han desarrollado investigaciones en el Isla. Aquí compilo las publicaciones sobre biología y geología marina, oceanografía física y química, ciencias atmosféricas y algunos temas sociales. Una lista de 599 artículos y capítulos, 41 libros, Suplementos, tesis, informes y un sitio de internet es incluida, y diez libros históricos donde se describen organismos y ambientes marinos de la Isla del Coco. La mayoría de las publicaciones (425 o 66.4%) son sobre biodiversidad marina (descripciones, listas y distribuciones de especies). De los grupos que más publicaciones hay son de los gasterópodos (81 trabajos), decápodos (67) y peces óseos (66). No hay publicaciones de varios grupos de animales que han sido observados en Isla del Coco, por ejemplo, gusanos planos de vida libre, parásitos o nemertinos, entre otros. Temas con muchas publicaciones son: biogeografía con 65, ecología (61) y geología (48); los ecosistemas más estudiados son los arrecifes coralinos con 14 trabajos. Se necesitan más publicaciones en muchos tópicos, tales como el impacto sobre la flora y fauna del Parque Nacional Isla del Coco de la pesca ilegal y el cambio climático.Isla del Coco (also known as Cocos Island), Pacific Costa Rica, has been visited and written about since the 16th Century, and since the late 1800’s many expeditions and scientists have carried out research in the Island. Here I compiled publications on marine biological, geological, oceanographic and atmospheric research done at Isla del Coco. A list of 599 scientific papers and chapters were compiled, together with 41 books, reports, Special Issues, theses and web sites, and ten historic books with descriptions of marine animals or environemnets. A mayority of the publications (425 or 66.4%) are related to marine biodiversity topics (species descriptions and lists of species); the most published groups are gastropods (81 papers), decapods (67) and bony fishes (66). There are no publications of several groups of animals that have been observed in the Island, for example free-living flat worms, parasites and nemerteans among others. Other topics with a large number of publications are, biogeography with 65, ecology (61) and geology (48); the most studied ecosystem are coral reefs with 14 papers. More publications are needed on many topics, such as impact of ilegal fishing and climate change on Isla del Coco National Park marine flora and fauna.

The study of coral diseases, coral pathogens, and the effects of diseases on tropical and subtropical coral reefs are all current, high-profile research areas. This interest has grown steadily since the first report of a coral disease in 1973. The author of this report was Arnfried Antonius and the publication was an abstract in the proceedings of a scientific meeting of the Association of Marine Laboratories of the Caribbean, or AMLC (then known as the Association of Island Marine Laboratories of the Caribbean). Since Antonius’ pioneering communication he continued working on coral diseases on reefs throughout the world, often documenting the first observation of a novel pathology in a novel location. Each of the coral diseases Antonius first described, in particular black band disease, is the subject of current and ongoing investigations addressing pathogens, etiology, and their effects on coral reefs. Many of the points and observations he made in his early papers are highly relevant to research today. This paper reviews aspects of Antonius’ early work, highlighting contributions he made that include the first in situ experimental studies aimed at discerning coral epizootiology and the first quantitative assessments of the role of environmental factors in coral disease. Antonius’ early findings are discussed in terms of relevant current controversies in this research area

Speaking is a remarkable feature of human beings. People speak on a daily basis in order to communicate and exchange meaningful information. Therefore, the development of such ability in L2 students becomes very important. This study reflects upon the experience of using three speaking activities: 1- a role-play, 2- an interview and 3- speaking workstations to foster students’ oral production in the EFL class (English as a Foreign Language). Ad- ditionally, the methodology and the action plan are addressed. Facilitated by action research, this study reports on the use and subtleties of these speaking activities. The effectiveness and implementation of these activities are also discussed in this paper. The relevance of these activities to the teaching of speaking constitutes one of the main findings of this paper. Finally, this research project was especially useful as it heightened awareness of the re- searcher’s teaching beliefs.

The Asian fish tapeworm, Bothriocephalus acheilognathi, has been considered one of the most dangerous parasites for cultured carp and a risk for native freshwater fish populations worldwide. This cestode is highly pathogenic for fishes especially fry. In this paper we record B. acheilognathi parasitizing the endangered and endemic freshwater fish Profundulus hildebrandi from the endorheic basin of San Cristóbal de las Casas, Chiapas, Mexico. B. acheilognathi was recorded from 10 of the 11 sampled localities, with high values of prevalence (>60%) and mean abundance (>4.50). The infection was persistent all through the year; gravid cestodes were recorded in all samples. It is assumed that B. acheilognathi entered to this area through the introduction of common carp Cyprinus carpio, for aquacultural purposes. The data presented in this paper document the successful introduction, colonization and establishment of this alien species into the endangered P. hildebrandi. Rev. Biol. Trop. 59 (3): 1099-1104. Epub 2011 September 01.

The properties of almost periodical functions and some new results have been published in [CA1], [CA2] and [CA3] In this paper we show some new definitions in order to analize some singularities. For this functions we find some uniqueness sets in $$\mathbb{R}$$ and $$\mathbb{R^{n}}$$. The paper finishes analizing the relation of this functions and the function sinc.

This is the first of two papers devoted to the proof of Zilber’s dichotomy for the case of difference-differential fields of characteristic zero. In this paper we use the techniques exposed in [9] to prove a weaker version of the dichotomy, more precisely, we prove the following: in DCFA the canonical base of a finite-dimensional type is internal to the fixed field of the field of constants. This will imply a weak version of Zilber’s dichotomy: a finite-dimensional type of SU-rank 1 is either 1-based or non-orthogonal to the fixed field of the field of constants.

Recently, in the field of project scheduling problems the concept of partially renewable resources has been introduced. Theoretically, it is a generalization of both renewable and non-renewable resources. From an applied point of view, partially renewable resources allow us to model a large variety of situations that do not fit into classical models, but can be found in real problems in timetabling and labour scheduling. When modelling real problems, the problem of project scheduling with partially renewable resources, as many other combinatorial problems, gets such large dimensions that it is quite difficult to apply solution procedures. In this paper, we describe some powerful preprocessing techniques that reduce significantly the dimension of the problems and therefore improve the efficiency of any algorithm used for solving them. The paper shows the excellent results obtained by these techniques on a set of test instance taken from the literature. Keywords: Project Scheduling, Preprocessing, Partially Renewable Resources.

Many data analysis problems deal with non supervised partitioning of a data set, in non empty clusters well separated between them and homogeneous within the clusters. An ideal partitioning is obtained when any object can be assigned a class without ambiguity. The present paper has two main parts; first, we present different methods and heuristics that find the number of clusters for optimal partitioning of a set; afterwards, we propose a new heuristic and we perform different comparisons in order to evaluate the advantages on well known data sets; we end the paper with some concluding remarks. Keywords: Optimal partitioning, clustering, classification, heuristics.

Se realizó un estudio de la variación estacional de una población de estadios inmaduros de A. aegypti en La Plata, Argentina, durante cuatro años. Se colocaron 36 recipientes plásticos con 700 ml de agua declorinada y se agregó, en cada uno, una tira de papel de filtro rodeando el perímetro interno como sitio para la ovipostura. Los huevos, larvas y pupas se cuantificaron semanalmente desde septiembre de 1996 hasta agosto de 2000. Tras cuantificar el número de huevos, los papeles fueron sumergidos en cada recipiente para facilitar la eclosión y se agregó un nuevo papel. La presencia de estados inmaduros de A. aegypti fue registrada desde diciembre-enero hasta junio durante los cuatro años de estudio. En 1997 se registraron 13 105 huevos, 7 978 larvas y 1 476 pupas con un 54.7 % de recipientes positivos; en 1998, 8 194 huevos, 668 larvas y 142 pupas y un 28.3 % de recipientes positivos para este mosquito. En 1999 se obtuvieron 13 510 huevos, 3 690 larvas y 743 pupas y un 56.7 % de recipientes con A. aegypti. Para el año 2000 se registraron 16 327 huevos, 4 669 larvas y 715 pupas y un porcentaje de recipientes positivos de 59.3 %. El número de huevos y el porcentaje de eclosión se redujo drásticamente en 1998 donde las temperaturas durante el período diciembre-mayo fueron entre uno y 2.5 ºC más bajas que durante los otros tres años de estudio. Estas temperaturas menores fueron consecuencia del fenómeno climático corriente El Niño.Population dynamics of the immature stages of Aedes aegypti (Diptera: Culicidae), vector of dengue: a longitudinal study (1996-2000). A four year study was conducted on a natural population of immature stages of Aedes aegypti after the re-invasion of Argentina by this vector in 1987. Thirty six plastic containers with 700 ml of dechlorinated water were placed in the La Plata Zoological Garden, La Plata, Argentina. A strip of filter paper around each container was added to facilitate egg counting. Eggs, larvae and pupae were counted weekly in each container from September, 1996 to August, 2000. After egg counting, papers were submerged to facilitate egg hatching and a new paper was placed in each container. Presence of A. aegypti immature stages was recorded from December-January to June during each of the four years of this study. In 1997, 13 105 eggs, 7 978 larvae and 1 476 pupae were registered with 54.7 % positive containers; during 1998, 8 194 eggs, 668 larvae and 142 pupae were recorded with 28.3 % positive containers; 13 510 eggs, 3 690 larvae and 743 pupae were registered during 1999 with 56.7 % positive containers; and 16 327 eggs, 4 669 larvae and 715 pupae during 2000 with 59.3 % of containers with presence of A. aegypti. Egg number and hatching rate were drastically reduced in 1998 when temperatures from December to May were 1 to 2.5 ºC lower than the other years of this study. These colder than usual temperatures in the summer of 1998 were a consequence of the El Niño event. Rev. Biol. Trop. 54 (3): 979-983. Epub 2006 Sept. 29.

Traditionally,studies of scientific productivity are biased in two ways: they are based on Current Contents, an index centered in British and American journals, and they seldom correct for population size, ignoring the relative effort that each society places in research. We studied national productivity for biology using a more representative index, the Biological Abstracts, and analyzed both total and relative productivity. English dominates biological publications with 87% (no other individual language reaches 2%). If the USA is considered a region by itself, it occupies the first place in per capita production of biology papers, with at least twice the productivity of either Asia or Europe. Canada, Oceania and Latin America occupy an intermediate position. The global output of scientific papers is dominated by Europe, USA, Japan, Canada, China and India. When corrected for population size, the countries with the greatest productivity of biology papers are the Nordic nations, Israel, Switzerland, Netherlands, Australia, Saint Lucia and Montserrat. The predominance of English as the language of biological research found in this study shows a continuation of the trend initiated around the year 1900. The large relative productivity of the USA reflects the importance that American society gives to science as the basis for technological and economic development, but the USA’s share of total scientific output has decreased from 44% in 1983 to 34% in 2002, while there is a greater growth of science in India, Japan and Latin America, among others. The increasing share obtained by China and India may reflect a recent change in attitude towards funding science. The leadership of Nordic nations, Israel, Switzerland, Netherlands and Australia can be explained by cultural attitude. Apparently, a positive trend is emerging in Latin America, where Chile improved its ranking in per capita productivity but Argentina, Costa Rica, Uruguay, Brazil and Cuba fell. Nevertheless, the most productive countries in total number of papers are Brazil, Mexico and Argentina: large countries with a long tradition of funding scientific research. Rev. Biol. Trop. 53(1-2):283-294. Epub 2005 Jun 24Tradicionalmente, los estudios sobre productividad científica tienen dos sesgos: se basan en el Current Contents, un índice basado en revistas de países industrializados, y rara vez toman en cuenta el tamaño de la población, con lo cual dejan por fuera a la mayoría de la producción de países no industrializados (e.g. América Latina) e ignoran el esfuerzo relativo que cada sociedad dedica a la ciencia. Estudiamos la productividad por país usando Biological Abstracts, que incluye más revistas y tomamos en cuenta el tamaño de la población. El idioma inglés domina la literatura científica con un 87% de los artículos (ningún otro idioma llega al 2%). Si se considera a los EEUU como una región, ocupa el primer lugar en productividad por habitante de artículos científicos en el área de la biología, con al menos el doble de la productividad que Asia o Europa. En tanto Canadá, Oceanía y América Latina ocupan lugares intermedios. Mundialmente, la producción total es dominada por Europa, EEUU, Japón, Canadá, China e India. Si se toma en cuenta el tamaño de la población, los países con mayor productividad son las naciones nórdicas, Israel, Suiza, Holanda, Australia, Santa Lucía y Montserrat. El dominio del inglés comenzó a desarrollarse desde cerca del año 1900. La gran producción relativa de los EEUU refleja la importancia que la sociedad estadounidense da a la ciencia como base para el desarrollo tecnológico y económico, pero la porción estadounidense de la producción científica mundial ha bajado de 44% en 1983 a 34% en 2002, al tiempo que se acelera el crecimiento de la producción científica en India, Japón y América Latina, entre otros. La proporción creciente de la literatura de China e India podría reflejar un cambio reciente en actitud hacia la inversión en ciencia. El liderazgo de las naciones nórdicas, Israel, Suiza, Holanda y Australia puede explicarse debido a la actitud cultural. Parece estar emergiendo una tendencia positiva en América Latina, donde Chile mejoró su ubicación en producción por habitante, pero Argentina, Costa Rica, Uruguay, Brasil y Cuba desmejoraron. Sin embargo, en producción bruta total, los países más productivos son Brasil, México y Argentina: países grandes con larga tradición de financiar la investigación científica

This paper presents a research study about timber shear walls, with materials commercially available in Costa Rica. With new developments in engineered timber, the Costa Rican Seismic Code included a chapter on timber structures, defining diaphragms and shear walls as part of the lateral resisting system. A research study was then carried out, with the objective of determining the structural behavior of a typical shear wall. Twelve specimens were constructed and tested, varying the nail spacing and anchorage system. The specimens were tested with monotonic and cyclic loading procedures according to ASTM E564 and ASTM E2126 respectively. It was found that the specimens can develop an adequate shear strength and stiffness if the end studs are adequately anchored to the foundation. These results are an important input for the Costa Rican Seismic Code and for the development of engineered timber in Costa Rica.

El primer microscopio electrónico que hubo en Costa Rica fue donado por el Gobierno de Japón, mediante su Agencia de Cooperación Internacional ("JICA" por sus siglas del Inglés) en 1974. Con ese equipo se consolidó la Unidad de Microscopia Electrónica (UME) de la Universidad de Costa Rica. Tres años más tarde se publicaron los primeros artículos científicos relacionados con aspectos ultraestructurales del Virus del rayado fino del maíz y rotavirus, el agente de la diarrea infantil. Subsecuentes trabajos de la UME fueron publicados en la Revista de Biología Tropical, totalizando al menos 50 artículos solo en esta revista para el año 2000. La reciente adquisición de espectrómetros de dispersión energética para el análisis de rayos X, acoplados a los microscopios electrónicos de transmisión y de rastreo, aumentan la capacidad de análisis de la UME, haciendo posible el análisis ultraestructural y químico elemental de un espécimen. Entre las aplicaciones de esta metodología está la evaluación de la contaminación ambiental con metales pesados; como estudios comparativos de residuos sobre hojas de árboles en zonas urbanas y en bosques primarios.The first electron microscope in Costa Rica was a donation from the government of Japan throught its International Cooperation Agency (JICA) in 1974. This donation made possible the consolidation of what was to hecome the University of Costa Rica's Electron Microscope Unit (UME). Within three years the first scientific papers were published, dealing with ultrastructural aspects of "Com's rayado fino virus" and rotavirus, viral agent of human diarrhea. Subsequent papers out of the UME were published for the most part in the Journal of Tropical Biology, totaling at least 50 in that journal alone by the year 2000. With the recent acquisition of Energy Dispersive Spectrometer to coupled in transmission electron microscope and scanning electron microscope to X ray analysis, the data acquisition of the UME has been greatly enhanced, making possible to analyze both structure and elemental chemical composition in a specimen. Other applications of this new technology include studies of environmental pollution with heavy metals, such as comparative analysis of residues on leaves from urban areas and those on leaves from primary forest.

Over its first half century the Revista de Biología Tropical published many papers and supplements dealing with the botany. However, the Revista is not a primary botanical journal. A wide variety of topics and geographic sources have been included, taking into consideration species from the Neotropics, but also from India and Nigeria. A complete index of botanical papers is presented.

El primer artículo sobre cualquier tema marino fue publicado en 1963 y desde entonces ha venido aumentando el número de publicaciones marinas hasta llegar a 637. Este número representa el 27% de todos los artículos publicados en la RBT (excluyendo los Suplementos) y el 33% desde 1979. La mayoría son Artículos de Fondo principalmente sobre Ecología (135 trabajos). De los ecosistemas marinos sobre el que más se ha publicado es los arrecifes coralinos (28) y los peces es el grupo taxonónico del que hay más trabajos (165). Casi la mitad de los Suplementos o Números Especiales de la RBT son sobre temas marinos. La RBT debe realizar esfuerzos para mantenerse a la cabeza en publicaciones marinas en América Latina.The first paper published in the Revista de Biología Tropical (RBT) on anything related to marine science was in 1963. Since then the number of marine-related papers has increased to 637, which represents 27% of the total production of RBT (excluding the Supplements), and 33% since 1979. Most publications are Full Articles on Ecology (135 papers). The marine ecosystem of which there is more publications is the coral reefs (28); and fish is the most studied taxonomic group (165). Almost half of the Supplements are marine related (12). The RBT must continue its efforts to maintain itself as a leading marine science publication in Latin America.

En cuatro campañas científicas al Parque Nacional de Coiba, Panamá, (1996-1998), se han hallado 19 especies de la familia Syllidae (subfamilias Autolytinae, Eusyllinae y Exogoninae). Se citan por primera vez para el Pacífico oriental cuatro especies: Eusyllis lamelligera Marion & Bobretzky, 1875, Exogone exmouthensis Hartmann-Schröder, 1980, Proceraea cf. cornuta (Agassiz, 1863) y Sphaerosyllis (S.) magnidentata Perkins, 1981. Diez especies se citan por primera vez para las costas del Pacífico de América Central: Amblyosyllis cf. granosa Ehlers, 1897 (sensu Westheide 1974), Amblyosyllis speciosa Izuka, 1912, Autolytus multidenticulatus Westheide, 1974, Exogone naidinoides Westheide, 1974, Grubeosyllis concinna Westheide, 1974, Odontosyllis fulgurans, (Audouin & Milne Edwars, 1833), Opisthodonta mitcheli Kudenov & Harris, 1995, Pionosyllis articulata Kudenov & Harris, 1995, Sphaerosyllis (S.) californiensis Hartman, 1966, Syllides cf. reishi Dorsey, 1978. La especie más dominante en las muestras de Pocillopora ssp. muerto, es S. armillaris con más del 50% de los ejemplares identificados y en las muestras de Telesto cf. multiflora las especies más abundante es G. concinna (67.36%). Por otro lado, una cuarta parte de las especies que aparecen en las muestras tomadas están restringidas a las aguas cálidas del Pacífico. Un 22% de las especies aparecen en Atlántico y Pacífico, y más del 13% son aparentemente circuntropicales y otro tanto aparentemente cosmopolitas.This is the second paper on the Syllidae (Polychaeta) from hard substrata of the Coiba National Park (Pacific coast of Panama) (the first paper treated Syllinae). On this second paper nineteen species belonging to eleven genera of the subfamilies Autolytinae, Eusyllinae and Exogoninae (Syllidae: Polychaeta) are reported. The samples were collected by SCUBA diving, either by removing 4 kg blocks of dead coral (Pocillopora spp.) or scraping off 25 x 25 cm quadrats of Telesto multiflora or algae (Dyctiota cf. flavellata, Padina cf. durvillaei and another currently unidentified species). They were collected during four expeditions carried out between 1996 and 1998. Four species are newly reported for the Eastern Pacific: Eusyllis lamelligera Marion & Bobretzky, 1875, Exogone exmouthensis Hartmann-Schröder, 1980, Proceraea cf. cornuta (Agassiz, 1863) and Sphaerosyllis (S.) magnidentata Perkins, 1981. Ten species are reported for the first time from the Central America Pacific coast: Amblyosyllis cf. granosa Ehlers, 1897 (sensu Westheide 1974), Amblyosyllis speciosa Izuka, 1912, Autolytus multidenticulatus Westheide, 1974, Exogone naidinoides Westheide, 1974, Grubeosyllis concinna (Westheide, 1974), Odontosyllis fulgurans (Audouin & Milne Edward, 1833), Opisthodonta mitchelli Kudenov & Harris, 1995, Pionosyllis articulata Kudenov & Harris, 1995, Sphaerosyllis (S.) californiensis Hartman, 1966 and Syllides cf. reishi Dorsey, 1978. The family Syllidae is represented in the Coiba National Park by 14% of cosmopolitan species, 14% of circumtropical species, 22% of Atlantic and Pacific species and 25% of Pacific species restricted to warm waters. In samples of dead coral the dominant species are S. armillaris (Muller, 1771) and S. gracilis (Campoy, 1982); in samples of telestaceans Grubeosyllis concinna dominates.

This paper presents a steady state approach to prevent voltage collapse in a power system. The power system operation close to stability boundaries is an important factor which may lead to voltage instability conditions. There are different ways to prevent voltage collapse in the power system; one of this is the correct coordination of the protection devices to avoid undesirable equipment disconnections.This paper proposes a new method to coordinate the back-up zone in the distance protection scheme. The methodology uses both Optimal Power Flow (OPF) and Continuation Power Flow (CPF) solutions to determine the impedance seen by the relay. These impedances are later compared to conclude which is the best option to set the parameter for the back-up zone in the relay. The methodology also considers the distance to Maximum Loading Point (MLP) and the corresponding Voltage Collapse Point (VCP). Therefore, undesirable disconnections can be avoided when the power system operates close to the stability boundaries. In order to demonstrate and validate the methodology, simulations are carried out on the IEEE 14-bus test system using MATLAB.

Language teaching is a profession that requires specialized skills. Teachers need a high level of proficiency in the language that they teach in addition to knowledge of second language acquisition and language teaching methodology. However, language teaching is frequently undervalued and misunderstood. This paper examines the (lack of) professionalism in language teaching from two different perspectives. First, the author considers the status of English language teaching around the world, which is adversely affected by the frequent practice of hiring unqualified native speakers. The second section of the paper addresses the current status of foreign language teaching in the United States. In spite of a critical need for foreign language skills in the U.S., language programs are being eliminated at universities around the country, and in some cases classroom instruction is being replaced with self-study software programs.

This paper has two primary objects. On the one hand, it presents a rigorous derivation of the Sraffa model recurring to some theorems discovered by Frobenius and Perron at the beginning of the twentieth century. This presentation is used to study the concept of productive economies or surplus economies, the solution to the price system and also to provide a clear derivation of the concept of the Standard Commodity. The second goal of the paper is to sketch von Neumann's balanced growth model and show how Sraffa's model is related to Neumann`s model. Showing the role of the assumptions, one can establish the relationship between both models, particularly the role of irreducibility to obtain uniqueness and unify the study of both models.

Problems in transit fare equity affect the daily commute of specific groups that depend mostly on public transportation. Previous studies showed that some routes present operational characteristics that increased the price charged to the users. To address this issue, a methodology to identify the routes that have fares much higher than expected, after considering operational parameters, is developed. This paper presents a methodology implemented to evaluate fare inequities in public transport networks. The case study is the bus public transport network in Costa Rica. The evaluation is performed using fare per kilometer as independent variable and operational variables, such as route length, monthly ridership and vehicle occupancy by using cluster analysis and Bayesian multilevel modelling. The results indicate that random coefficients models perform better than independent models for clustered data. Furthermore, the routes with higher differences between observed and estimated (i.e. expected) fares are the ones to be addressed first in individual audits, because these are the routes who charge higher operational costs into the fare, increasing inequity among the population.

The object of this paper is to describe and analyze in a formal and integrated way the alternative solutions proposed to the problem of transforming labor values into prices. Considering that the literature on this topic is sometimes diffused, this paper presents in a unified way the solutions advanced following a mathematical treatment and presentation. Special emphasis is paid to a new normalization procedure that emphasize on the role of the labor theory value as a theory of value formation rather than price. In this tradition, prices will tend to assign or distribute value across society. As opposed to this approach, the paper also contrasts and analyzes the classical approach that focuses on the simultaneous determination of price and value. The paper is then a search for a unified treatment of the topic.

This paper deals with the so called public focused policies which arose in Argentina as an answer to the high social cost produced by the application of neoliberal policies. the concept of poverty, as it will be shown, is essential that most public policies justify their existence on trying to solve it. [ABSTRACT FROM AUTHOR]

Rojas-Valverde, D., Fallas-Campos, A. & Alpízar-Alpízar, M. (2020). Esports in times of a global pandemic: opportunities and future challenges when transforming gaming into a sport in Costa Rica. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 18(2), 1-11. In response to the COVID-19 global pandemic, the world has undergone a series of drastic changes. Due to this, postponement and cancellation of multiple annual big sports events have been announced, giving way to new digital alternatives that follow government isolation provisions. eSports has shown to be a rapidly evolving alternative to maintain the sportsmanship and passion that sports bring to the general population. In Costa Rica, like everywhere else, this sport has seen accelerated growth with a high rate of evolution. In this regard, the country faces significant challenges to promote future eSports events, professional development, and the creation of an organizational structure for its optimal practice. This paper aims to analyze how the global pandemic exposes the need to direct the attention to digital sports alternatives such as eSport and the future challenges that Costa Rica will face to develop it in an effective and efficient way.

The use of continuous reactors for heterogeneous catalytic ozonation is yet to be investigated in order to develop a viable technology for industrial applications. This paper presents hydrodynamic and degradation studies on the use of a co-current down flow trickle bed reactor for heterogeneous catalytic ozonation of phenol (as model pollutant) over Fe-Diatomite pellets and Fe-coated glass beads. It was found that the reactor can operate under trickle or pulsing flow regimes, promoting mass transfer augmentation. Residence time distribution data, fitted with n-CSTR and axial dispersion (ADM) models, showed low axial dispersion and high flow distribution. Just the Fe-diatomite pellets showed important phenol adsorption (16 %). Degradation experiments demonstrated that phenol conversion was substantial when using both catalysts, up to 19,7 % pollutant conversion with liquid-phase space times of just 6 s. Compared to direct ozonation, the use of the Fe-diatomite pellets and Fe-coated glass beads enhanced the reactor performance by 48 % and 23 %, respectively. It was confirmed that mass transfer is an important factor that restricts this reaction system performance; consequently, further improvement in mass transport rate is necessary for system optimization.

This paper presents estimates of how the pandemic of COVID-19 and the lockdown policies implemented in Costa Rica to contain its spread affected the firm’s decision to post vacancies and workers search behavior, using data from the online job advertisement webpage buscoempleocr. Differences in Differences estimates suggest a drop of 67.2% in the inflow of vacancies posted by firms before and after the policies were implemented, relative to previous year. Results by industry states that Accommodation and Food Services, reported the highest decline in vacancy posting. By occupations, the reduction in vacancy posting was more severe for the groups of service and sales workers and elementary occupations. By location, the most affected provinces are those that i) are characterized by their touristic industries and ii) are main cities where industries are concentrated. Regarding the labor supply, there is an increase in the number of job seekers, however their search intensity might have declined during the pandemic.