Heavy fermion d-wave superconductivity: a X-boson approach

From an extension of the periodic Anderson model (PAM) in the $U=\infty$ limit taking into account the effect of a nearest neighbor attractive interaction between $f$-electrons, we compare the obtained superconducting phase diagram of a two dimensional d-wave superconductor with the results obtained for an isotropic s-wave superconductor employing the X-boson method.Comment: Submitted to the Proceeding of the ICM 2003-Rome. Requires elsart3.cl

Prevalence and intensity of black-spot disease in fish community from a subtropical stream (Santa Lucía river basin, Uruguay)

The objective of the present study was to identify fish species susceptible to black spot disease, the temporal variation in intensity prevalence and abundance of black spot, and its correlation with environmental and host parameters. In order to do so, several sampling campaigns were conducted bimonthly during one year, along the main course of an agricultural watershed. A total of twenty-seven fish species were collected, out of which only two, Astyanax aff. fasciatus ("mojarra") and Oligosarcus jenynsii ("dientudo") presented black spot disease. In A. aff. fasciatus, 63% of black spot prevalence was registered and did not show significant seasonal changes during the sampling period, nor did the abundance and intensity. Regarding possible relations between the disease and environmental and host parameters, a higher intensity of black spot infection was observed in the ventral region of the fish and allometric coefficient (WT − LS, relationship) values did not differ significantly between parasitized and non-parasitized fish groups.El objetivo del presente estudio fue identificar las especies susceptibles a la enfermedad del punto negro, la variación temporal de su intensidad, prevalencia y abundancia; así como su relación con parámetros ambientales y del hospedador. Para ello, se realizaron muestreos bimensualmente durante un año, en el curso principal de una cuenca agrícola suburbana. Fueron colectadas un total de veintisiete especies, de las cuales en solo dos, Astyanax aff. fasciatus ("mojarra") y Oligosarcus jenynsii ("dientudo"), se observó la enfermedad del punto negro. En A. aff. fasciatus se registró una prevalencia de puntos negros del 63% y la misma no presentó diferencias significativas durante el período de muestreo, al igual que su abundancia e intensidad. En cuanto a las posibles relaciones de la enfermedad con parámetros ambientales y del hospedador, se observó una mayor intensidad de la infección en la región ventral de los peces y no se encontraron diferencias significativas en los valores del coeficiente alométrico (relación WT − LS) entre los peces parasitados y no parasitados

Institutional design for metropolitan governance and planning in São Paulo

O artigo apresenta a experiência do Plano de Desenvolvimento Urbano Integrado da Região Metropolitana de São Paulo (PDUI da RMSP) sob a ótica da participação da Prefeitura de São Paulo no processo colegiado que se estabeleceu entre os anos de 2015 e 2016, e que estruturou um desenho institucional para o seu desenvolvimento. Trata-se de discutir os desafios e dilemas considerados, as estratégias elencadas e as pactuações realizadas, tanto relativas aos conteúdos do PDUI quanto ao seu processo de elaboração na RMSP. O objetivo é refletir, nesse percurso, o método, os conceitos e o alcance do instrumento do PDUI para o desenvolvimento da política metropolitana brasileira a partir do caso de São Paulo. As fontes de referência são eminentemente os produtos dos trabalhos desenvolvidos nesse período, que foram objeto de formulação, debate e deliberação nos fóruns colegiados da gestão pública, sob a responsabilidade do Conselho de Desenvolvimento da Região Metropolitana de São Paulo.This paper presents the experience of the Integrated Urban Development Plan of the Metropolitan Region of São Paulo (IUDP of the MRSP) under the perspective of participation of the São Paulo City Government in the collegiate process that took place between 2015 and 2016, and which structured an institutional design for its development. It discusses the considered challenges and dilemmas, the listed strategies and partnerships related to the contents of the IUDP, as well as to its elaboration process in the MRSP. The objective is to reflect, throughout this journey, about the method, concepts and scope of the IUDP instrument for the development of Brazilian metropolitan policy based on the case of São Paulo. The main reference sources are the products resulting from the works carried out during this period. They were subject to formulation, debate and deliberation in collegiate forums of public management under responsibility of the Development Council of the Metropolitan Region of São Paulo

The Welfare Cost of Macroeconomic Uncertainty in the Post-War Period

Lucas (1987) has shown the surprising result that the welfare cost of business cycles is quite small. Using standard assumptions on preferences and a fully-fledged econometric model we computed the welfare costs of macroeconomic uncertainty for the post-WWII era using the multivariate Beveridge-Nelson decomposition for trends and cycles, which considers not only business-cycle uncertainty but also uncertainty from the stochastic trend in consumption. The post-WWII period is relatively quiet, with the welfare costs of uncertainty being about 0.9% of per-capita consumption. Although changing the decomposition method changed substantially initial results, the welfare cost of uncertainty is qualitatively small in the post-WWII era - about $175.00 a year per-capita in the U.S. We also computed the marginal welfare cost of macroeconomic uncertainty using this same technique. It is about twice as large as the welfare cost -$350.00 a year per-capita.welfare costs of business cycles, Beveridge-Nelson decomposition

On the Welfare Costs of Business-Cycle Fluctuations and Economic-Growth Variation in the 20th Century

Lucas (1987) has shown a surprising result in business-cycle research: the welfare cost ofbusiness cycles are very small. Our paper has several original contributions. First, in computingwelfare costs, we propose a novel setup that separates the effects of uncertainty stemming frombusiness-cycle fluctuations and economic-growth variation. Second, we extend the sample from which to compute the moments of consumption: the whole of the literature chose primarily to work with post-WWII data. For this period, actual consumption is already a result of counter-cyclical policies, and is potentially smoother than what it otherwise have been in their absence. So, we employ also pre-WWII data. Third, we take an econometric approach and compute explicitly the asymptotic standard deviation of welfare costs using the Delta Method. Estimates of welfare costs show major differences for the pre-WWII and the post-WWII era. They can reach up to 15 times for reasonable parameter values -β=0.985, and ∅=5. For example, in the pre-WWII period (1901-1941), welfare cost estimates are 0.31% of consumption if we consider only permanent shocks and 0.61% of consumption if we consider only transitory shocks. In comparison, the post-WWII era is much quieter: welfare costs of economic growth are 0.11% and welfare costs of business cycles are 0.037% - the latter being very close to the estimate in Lucas (0.040%). Estimates of marginal welfare costs are roughly twice the size of the total welfare costs. For the pre-WWII era, marginal welfare costs of economic-growth and business- cycle fluctuations are respectively 0.63% and 1.17% of per-capita consumption. The same figures for the post-WWII era are, respectively, 0.21% and 0.07% of per-capita consumption.

PROMOÇÃO DA SAÚDE ENTRE TRABALHADORES RURAIS DA AGROINDÚSTRIA CANAVIEIRA DA REGIÃO DE ARARAQUARA (SP): ESTRATÉGIAS DE INTERVENÇÃO

O mundo do trabalho rural vem passando por transformações tecnológicas e organizacionais que acarretaram impactos nas relações e nas condições laborais. Essas mudanças deixaram os trabalhadores mais vulneráveis à ocorrência de acidentes e agravos à saúde. Este estudo visou promover reuniões à equipe do Centro de Referência em Saúde do Trabalhador (CEREST) de Araraquara (SP), oferecendo informações sobre os acidentes de trabalho envolvendo os trabalhadores da agroindústria canavieira, tendo como referencial a Promoção da Saúde