El café y las transacciones inmobiliarias en Costa Rica (1800-1850): un balance

Introducción Varios trabajos publicados en los años recientes tratan de profundizar en diversos temas relativos a  aspectos socio económicos de la Costa Rica de los inicios de la expansión cafetalera. Resumiremos a  continuación nuestras nuevas  investigaciones sobre le tema, que deben  considerarse como una revisión de nuestro aporte efectuado en 1975. Roger Chrrnside intentó demostrar que si existe un proceso temprano de concentración de  la propiedad de  la tierra en la economía del café, llamando la atención este ha sido sin duda el aspecto más estimulante de su trabajo sobre  la necesidad de definir rigurosamente el concepto  y las medidas utilizadas en la apreciación del fenómeno

El café y las transacciones inmobiliarias en Costa Rica (1800-1850): un balance

Introducción Varios trabajos publicados en los años recientes tratan de profundizar en diversos temas relativos a  aspectos socio económicos de la Costa Rica de los inicios de la expansión cafetalera. Resumiremos a  continuación nuestras nuevas  investigaciones sobre le tema, que deben  considerarse como una revisión de nuestro aporte efectuado en 1975. Roger Chrrnside intentó demostrar que si existe un proceso temprano de concentración de  la propiedad de  la tierra en la economía del café, llamando la atención este ha sido sin duda el aspecto más estimulante de su trabajo sobre  la necesidad de definir rigurosamente el concepto  y las medidas utilizadas en la apreciación del fenómeno

Habilitadores y habilitados en el Valle Central de Costa Rica. El financiamiento de la producción cafetalera en los inicios de su expansión (1838-1850)

ResumenEn una época en que todo se estaba reestructurando, habilitado, habilitador, habilitación carecieron de un significado socio-económico preciso. El habilitado no era siempre un explotado, y el habilitador eventualmente podía serlo. La habilitación era a veces una relación mercantil entre capitalistas, mientras que en otras ocasiones era un mecanismo para extraer el excedente agrario.AbstractAt a time when all was being restructured, the terms habilitado; habilitador and habilitación lacked a precise socioeconomic meaning. Habilitados were not always exploited, and habilitadores might be subject to exploitation. Habilitación was sometimes a mercantile relation between capitalists, while other times it was a mechanism to extract agrarian surplus.

La estructura crediticia del Valle Central de Costa Rica (1850-1860)

ResumenAnálisis de las distintas fuentes crediticias existentes en el Valle Central de Costa Rica entre 1850 y 1860. Estudia el papel jugado por el crédito en la economía costarricense como instrumento clave de dominación y para la extracción del excedente del campesino.AbstractA discussion of the various sources of credit in the Central Valley of Costa Rica between 1850 and 1860. The author studies of credit in the Costa Rican economy as a key means of dominations and for surplus extractions from the peasantry.

Campesino, granjero, proletariado: formación de clase en una economía cafetalera de pequeños propietarios 1850-1950

ResumenEstudia la formación de clase en Costa Rica entre 1850-1950. La sociedad costarricense, sustentada principalmente en el cultivo del café, da testimonio de una transición “campesino a finquero” en la agricultura, la cual trasformó a un campesino orientado hacia la producción de subsistencia en clases de propietarios y no propietarios, patronos y obreros.AbstractAnalyzes class formation in Costa Rica between 1850 and 1950. The agricultural sector of Costa Rica society witnessed the transition from “peasant to farmer”, that is, transformation of peasantry engaged in subsistence activities to a sector of landowners and landless people, entrepreneurs and works

Comentario del libro: “Costa Rica. 1800-1850: El legado colonial y la génesis del capitalismo, de Iván Molina”

IntroducciónEn éste, el cuarto de dieciseis volúmenes de la serie patrocianda por el Centro de Investigaciones Históricas de la Universidad de Costa Rica, Molina intenta al menos resumir los resultados de una gran variedad de investigaciones históricas recientes. El autor se destaca tanto por una prosa atractiva, como por un enfoque que no se reduce al esquema "café-capitalismo-sociedad" característico de anteriores estudios suyos. Es más, si hay una sorpresa agradable en esta obra, está en el evidente interés y desarrollo de los estudios de "mentalité", siguiendo tanto a los modelos franco-ingleses como lo poco hecho en el ámbito local... 

Los protagonistas de la prensa (Los primeros escritores de periódicos costarricenses, 1833-1850

ResumenEste artículo tiene como objetivo analizar a los primeros escritores de los periódicos costarricenses de la primera mitad del siglo XIX, como paso previo para estudiar el desarrollo de la prensa y la transmisión del pensamiento colectivamente, a través del material impreso y su impacto en la sociedad decimonónica.AbstractThe purpose of this article is to analyze the main writers publishing in Costa Rican newspapers during the first half of the 19th century. This is a prior step for a discussion of the development of the press and the collective transmission of ideas by means of printed material, and of their impact of 19th century society.

¿Anarquistas, ambientalistas o revolucionarios? La conflictividad rural en Chalco. San Francisco Acuautla contra Zoquiapa, 1850-1868

Resumen El artículo pretende determinar el peso de lo material y lo cultural como factores fundamentales del levantamiento rural en la región de Chalco, México. Entre 1760 y 1920 se producen una serie de cambios en la estructura económica y social de esa región que revelan la ofensiva de la hacienda comercial en detrimento de los recursos comunales de los pueblos. Esto genera una serie de conflictos agrarios de los cuales este artículo analiza uno, el de 1868, ya que su análisis permite considerar y discutir la naturaleza esencial del movimiento social, ponderando el componente anarquista con la dimensión ambientalista del mismo. El autor se encuentra un discurso reivindicativo de los recursos naturales que considera ?ambientalista? por ser una defensa del modo de vida de los pueblos y no sólo de un recurso ?ambiental?, mismo que inserta en la reflexión global sobre la encrucijada entre conflicto y negociación en la región de Chalco. Abstract This essay analyzes material and cultural explanations of rural rebellions in Chalco, Mexico between 1760 and 1920. In that period, several social and economic changes took place which reveal the consolidation of the commercial hacienda against pueblos communal resources. This situation produced several agrarian conflicts; this paper analyses one of those conflicts: that of 1868. The study of that conflict discloses the composition of the rural movement in its anarchist and environmental dimensions. This paper argues that the pueblos defended their natural resources and consequently their way of life by using an ?environmentalist? discourse. Such a discourse was inserted at a crossroads of conflict and negotiation in Chalco.

La participación de la iglesia católica en el control del espacio en medio de la creación de un país llamado Costa Rica, 1850-1920

La Iglesia católica desde que llegó al continente americano de la mano de los conquistadores y colonizadores europeos, desempeñó tareas vinculadas con el control y vigilancia de la población que aquí habitaba. Esta labor la siguió desempeñando luego de la independencia de las colonias españolas. El presente artículo pretende dilucidar cómo se estableció la colaboración brindada al estado por parte de la jerarquía del catolicismo costarricense luego de erigida la Diócesis de San José hasta el fin del obispado josefino en 1920 en las tareas de controlar, vigilar y apropiarse tanto -del espacio geográfico considerado como costarricense, como de los habitantes que residían en dichos territorios. Por ello se analizará cuáles fueron y como utilizó la jerarquía de la Iglesia católica costarricense los mecanismos de control que tenía a su disposición para alcanzar tales objetivos.Abstract This essay analyzes the collaboration of the Catholic Church with the Costa Rican State between the foundations of the Diocese of San José until 1920. lt shows how the Church helped to control, watch and take over the geographical space of Costa Rica and individual living in that land. It also studies mechanisms of control the Catholic Church carried out in this process.

Cryptic species, life cycles, and the phylogeny of Clytia (Cnidaria: Hydrozoa: Campanulariidae)

Medusae and polyps of Clytia are abundantly found in coastal marine environments and one species in the genus-Clytia hemisphaerica (Linnaeus, 1767)-has become an important experimental model. Yet, only 10 species in the genus have had their life cycle investigated. Most species of Clytia are also poorly described, and detailed life cycle and morphological studies are needed for accurate species-level identifications. Here, we investigated the life cycle of Clytia elsaeoswaldae Stechow, 1914, a species described for the tropical western Atlantic and subsequently considered conspecific to the nearly-cosmopolitan species Clytia gracilis (Sars, 1850) and Clytia hemisphaerica, originally described for the temperate North Atlantic. Based on observations of mature medusae and multiple colonies from southeastern Brazil and the U. S. Virgin Islands (type locality), our results show that C. elsaeoswaldae is morphologically distinct from C. gracilis and C. hemisphaerica. The morphological results are corroborated by a multigene phylogenetic analysis of the genus Clytia, which shows that C. gracilis-like species form a polyphyletic group of several species. These results suggest that the nearly-cosmopolitan distribution attributed to some species of Clytia may be due to the non-recognition of morphologically similar species with more restricted ranges.

Tidal-amplitude rhythms of larval release: variable departure from presumed optimal timing among populations of the mottled shore crab

It is widely assumed that optimal timing of larval release is of major importance to offspring survival, but the extent to which environmental factors entrain synchronous reproductive rhythms in natural populations is not well known. We sampled the broods of ovigerous females of the common shore crab Pachygrapsus transversus at both sheltered and exposed rocky shores interspersed along a so-km coastline, during four different periods, to better assess inter-population differences of larval release timing and to test for the effect of wave action. Shore-specific patterns were consistent through time. Maximum release fell within 1 day around syzygies on all shores, which matched dates of maximum tidal amplitude. Within this very narrow range, populations at exposed shores anticipated hatching compared to those at sheltered areas, possibly due to mechanical stimulation by wave action. Average departures from syzygial release ranged consistently among shores from 2.4 to 3.3 days, but in this case we found no evidence for the effect of wave exposure. Therefore, processes varying at the scale of a few kilometres affect the precision of semilunar timing and may produce differences in the survival of recently hatched larvae. Understanding the underlying mechanisms causing departures from presumed optimal release timing is thus important for a more comprehensive evaluation of reproductive success of invertebrate populations.

Comparison between constant and decreasing rest intervals: influence on maximal strength and hypertrophy

de Souza Jr, TP, Fleck, SJ, Simao, R, Dubas, JP, Pereira, B, de Brito Pacheco, EM, da Silva, AC, and de Oliveira, PR. Comparison between constant and decreasing rest intervals: influence on maximal strength and hypertrophy. J Strength Cond Res 24(7): 1843-1850, 2010-Most resistance training programs use constant rest period lengths between sets and exercises, but some programs use decreasing rest period lengths as training progresses. The aim of this study was to compare the effect on strength and hypertrophy of 8 weeks of resistance training using constant rest intervals (CIs) and decreasing rest intervals (DIs) between sets and exercises. Twenty young men recreationally trained in strength training were randomly assigned to either a CI or DI training group. During the first 2 weeks of training, 3 sets of 10-12 repetition maximum (RM) with 2-minute rest intervals between sets and exercises were performed by both groups. During the next 6 weeks of training, the CI group trained using 2 minutes between sets and exercises (4 sets of 8-10RM), and the DI group trained with DIs (2 minutes decreasing to 30 seconds) as the 6 weeks of training progressed (4 sets of 8-10RM). Total training volume of the bench press and squat were significantly lower for the DI compared to the CI group (bench press 9.4%, squat 13.9%) and weekly training volume of these same exercises was lower in the DI group from weeks 6 to 8 of training. Strength (1RM) in the bench press and squat, knee extensor and flexor isokinetic measures of peak torque, and muscle cross-sectional area (CSA) using magnetic resonance imaging were assessed pretraining and posttraining. No significant differences (p <= 0.05) were shown between the CI and DI training protocols for CSA (arm 13.8 vs. 14.5%, thigh 16.6 vs. 16.3%), 1RM (bench press 28 vs. 37%, squat 34 vs. 34%), and isokinetic peak torque. In conclusion, the results indicate that a training protocol with DI is just as effective as a CI protocol over short training periods (6 weeks) for increasing maximal strength and muscle CSA; thus, either type of program can be used over a short training period to cause strength and hypertrophy.

Infiltration of Al2O3/Y2O3 mix into SiC ceramic preforms

Silicon carbide ceramics are very interesting materials to engineering applications because of their properties. These ceramics are produced by liquid phase sintering (LPS), where elevated temperature and time are necessary, and generally form volatile products that promote defects and damage their mechanical properties. In this work was studied the infiltration process to produce SiC ceramics, using shorter time and temperature than LPS, thereby reducing the undesirable chemical reactions. SiC powder was pressed at 300 MPa and pre-sintered at 1550 degrees C for 30 min. Unidirectional and spontaneous infiltration of this preform by Al2O3/Y2O3 liquid was done at 1850 degrees C for 5, 10, 30 and 60 min. The kinetics of infiltration was studied, and the infiltration equilibrium happened when the liquid infiltrated 12 mm into perform. The microstructures show grains of the SiC surrounded by infiltrated additives. The hardness and fracture toughness are similar to conventional SiC ceramics obtained by LPS. (c) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Application of the essential work of fracture method in ranking the performance in service of high-density polyethylene resins employed in pressure pipes

High-density polyethylene resins have increasingly been used in the production of pipes for water- and gas-pressurized distribution systems and are expected to remain in service for several years, but they eventually fail prematurely by creep fracture. Usual standard methods used to rank resins in terms of their resistance to fracture are expensive and non-practical for quality control purposes, justifying the search for alternative methods. Essential work of fracture (EWF) method provides a relatively simple procedure to characterize the fracture behavior of ductile polymers, such as polyethylene resins. In the present work, six resins were analyzed using the EWF methodology. The results show that the plastic work dissipation factor, beta w(p), is the most reliable parameter to evaluate the performance. Attention must be given to specimen preparation that might result in excessive dispersion in the results, especially for the essential work of fracture w(e).

Light scattering in polycrystalline alumina with bi-dimensionally large surface grains

Alumina ceramics with high in-line transmittance at 0.5-1.0 mm-thickness were prepared with different doping additives by sintering at 1850 degrees C in vacuum for 1-8 h. Depending on the additive contents and sintering variables bi-dimensionally large surface grains, caused by surface evaporation of MgO, had grown parallel to the surface with similar to 100 mu m thickness and lateral sizes up to the millimeter range. The abnormal grain-growth process also resulted in the formation of pores entrapped inside the large surface grains within a narrow zone at 10-20 mu m distance from the surface. The fraction of these pores is thickness-invariant. Scattering factors associated to the pores entrapped inside the bi-dimensionally large surface grains, second-phase particles, grain-boundaries, and microstructural surface defects are derived from the results of in-line transmission (at 600 nm) and are used together with microstructural characteristics to explain the light transmittance in these materials. (C) 2008 Elsevier Ltd. All rights reserved.