Experimental observation of two-dimensional fluctuation magnetization in the vicinity of T_c for low values of the magnetic field in deoxygenated YBa_2Cu_3O_{7-x}

We measured isofield magnetization curves as a function of temperature in two single crystal of deoxygenated YBaCuO with T_c = 52 and 41.5 K. Isofield MvsT were obtained for fields running from 0.05 to 4 kOe. The reversible region of the magnetization curves was analyzed in terms of a scaling proposed by Prange, but searching for the best exponent $\upsilon$. The scaling analysis carried out for each data sample set with $\upsilon$=0.669, which corresponds to the 3D-xy exponent, did not produced a collapsing of curves when applied to MvsT curves data obtained for the lowest fields. The resulting analysis for the Y123 crystal with T_c = 41.5 K, shows that lower field curves collapse over the entire reversible region following the Prange's scaling with $\upsilon$=1, suggesting a two-dimensional behavior. It is shown that the same data obeying the Prange's scaling with $\upsilon$=1 for crystal with T_c = 41.5 K, as well low field data for crystal with $T_c$ = 52 K, obey the known two-dimensional scaling law obtained in the lowest-Landau-level approximation.Comment: 4 pages, 3 figure

Assessing the extent of occurrence, area of occupancy, territory size, and population size of marsh tapaculo (Scytalopus iraiensis)

Evaluación de la extensión de presencia, la superficie de ocupación, el tamaño del territorio y el tamaño de la población del churrín palustre (Scytalopus iraiensis) Descrito por primera vez en 1998, el churrín palustre (Scytalopus iraiensis) es un ave en peligro de extinción de la familia Rhinocryptidae. Es endémica de Brasil y su presencia queda restringida a los planos aluviales de los ríos y los cursos de agua. Debido a sus hábitos crípticos y a los ambientes en los que se halla presente, la información disponible sobre su biología, su historia natural y su distribución es escasa. Compilamos varios registros de presencia (99 registros), delimitamos la extensión de las presencias (296.584 km2), calculamos la superficie de ocupación (84 km2) y estimamos el tamaño del territorio (5.313 ± 1.201 m2 por pareja), la densidad de la población (3,76 ± 0,85 individuos por hectárea) y el tamaño de la población (31.584 ± 7.140 individuos maduros) del churrín palustre. La especie se registró en zonas de marismas asociada a cuatro tipos de vegetación y en cuatro zonas ecológicas. Esta nueva información es fundamental para respaldar la reevaluación de la categoría de situación de peligro de la especie y potenciar el conocimiento de esta ave endémica y poco conocida de Brasil

Behavior and Design of Axially Compressed Sheathed Wall Studs

The objective of this paper is to summarize efforts in a multi year project dedicated to developing a reliable design method for cold - formed steel wall studs that rely on sheathing for bracing. Testing on single columns with sheathing, and full - scale walls with sheathin g, are summarized. Particular emphasis is placed on the observed limit states given the different sheathing conditions. The sheathing supplies beneficial restraint to the wall studs and the stiffness of this sheathing - based restraint is characterized exper imentally and analytically. A unique application of the Direct Strength Method of design is explored where the sheathing - based restraint is used explicitly in determination of the elastic buckling loads of the wall studs, and then these elastic buckling lo ads are utilized to determine the strength. The test results are compared with the newly proposed design method as well as with previous design methods adopted by the AISI Specification. Good agreement is demonstrated for the new approach both in terms of strength an d limit states prediction

Tamanho do corpo, despigmentação das partes bucais e presença de Batrachochytrium dendrobatidis estão relacionados em Hylodes cf. ornatus e Lithobates catesbeianus

A fungal pathogen Batrachochytrium dendrobatidis (Bd), which can cause morbidity and death of anurans, has affected amphibian populations on a worldwide basis. Availability of pure cultures of Bd isolates is essential for experimental studies to understand the ecology of this pathogen. We evaluated the relationships of body length of Hylodes cf. ornatus and Lithobates catesbeianus tadpoles to depigmentation of mouthparts and determined if dekeratinization indicated an infection by Batrachochytrium dendrobatidis. A strong association existed for both species, one from South America (Brazil: São Paulo) and one from North America (USA: Maine). We believe it prudent not to kill adult amphibians if avoidable, thus obtaining tissue for isolating Bd from tadpoles is reasonable because infected specimens of some species can be selectively collected based on depigmentation of mouthparts.O fungo patógeno Batrachochytrium dendrobatidis (Bd) é apontado como o causador de morbidade e morte em anuros, e tem afetado populações de anfíbios em uma base mundial. Avaliar culturas puras de isolados de Bd é essencial para estudos experimentais para o entendimento da ecologia desse patógeno. Avaliou-se a relação entre o comprimento do corpo em girinos de Hylodes cf. ornatus e Lithobates catesbeianus com a despigmentação das peças bucais, para verificar se a desqueratinização indica uma infecção por Batrachochytrium dendrobatidis. Uma forte associação existe para ambas as espécies, uma da América do Sul (Brasil: São Paulo) e uma da América do Norte (USA: Maine). Acredita-se ser prudente este uso, para evitar a morte de anfíbios adultos; dessa forma, obter tecidos para isolar o Bd de girinos é razoável, porque espécimes infectados podem ser coletados seletivamente com base na despigmentação do aparelho bucal.195199Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

SUBNOTIFICAÇÃO DE ACIDENTES DE TRABALHO COM MATERIAL BIOLÓGICO DE TÉCNICOS DE ENFERMAGEM EM HOSPITAL UNIVERSITÁRIO

Objetivo: quantificar a subnotificação e motivos do não registro dos acidentes de trabalho com material biológico de técnicos de enfermagem em hospital universitário. Método: pesquisa de corte transversal quantitativa com proporção amostral de 25%. Participaram 275 profissionais de 9 unidades que responderam questionário sobre risco ocupacional. Resultados: foram relatados 747 acidentes, sendo 71% não notificados. As variáveis: horário de trabalho, unidades e tipos de exposição foram correlacionadas estatisticamente à subnotificação (p < 0,05). Os motivos para não registro: “Quem trabalha na enfermagem sofre acidente com material biológico” apresentou 3,5 vezes mais chances de subnotificar acidente percutâneo com sangue; e “A saída pode sobrecarregar colegas de trabalho” teve 2,3 vezes mais chances de subnotificar acidente mucocutâneo. Conclusão: as subnotificações dos acidentes foram 2,4 vezes maiores que as notificações, com predomínio da exposição mucocutânea e os principais motivos foram relacionados à pouca percepção sobre o risco ocupacional e a sobrecarga de trabalho.Descritores: Saúde do trabalhador. Riscos ocupacionais. Acidentes de trabalho. Enfermagem. Exposição ocupacional. Notificação

The evolution of the world’s production fragmentation : 2000 – 2014, a network analysis

We employ network analysis to characterise the evolution of the world’s trade in value-added between 2000 and 2014. Relatively to previous studies, more recent time points are included, consolidating some of their conclusions. A small number of countries occupy central positions in the international production chains and concentration rules, along a few main production regions. Without Germany, Europe loses its pumping engine; the same for Asia without China and, in 2014, for the whole world, without the US. Will China eventually either absorb or dominate the other hubs, becoming the new central node of the World Trade Network?info:eu-repo/semantics/publishedVersio

Is it necessary to soak rice grains to prepare Rhizoctonia solani AG-4 inoculum?

A study was conducted to evaluate the effects on the development of root rot on common bean, cv. 'Dufrix' after treatment with four volumes of water (0, 30%, 60%, and 90%, v/w) added to rice grains previously immersed in water for 24 hours before autoclaving and colonization of grains by Rhizoctonia solani AG-4. Colonized rice grains and non-infested rice grains were mixed in pots with sterilized soil and sand (2:1), where beans were sown. Based on results of area under plant emergence curve, plant height, plant dry weight, and disease severity, we conclude that inoculum is more effective in causing disease when no water is added to the rice grains before autoclaving.CNPqFAPEMI