The beta Pictoris association: Catalog of photometric rotational periods of low-mass members and candidate members

We intended to compile the most complete catalog of bona fide members and candidate members of the beta Pictoris association, and to measure their rotation periods and basic properties from our own observations, public archives, and exploring the literature. We carried out a multi-observatories campaign to get our own photometric time series and collected all archived public photometric data time series for the stars in our catalog. Each time series was analyzed with the Lomb-Scargle and CLEAN periodograms to search for the stellar rotation periods. We complemented the measured rotational properties with detailed information on multiplicity, membership, and projected rotational velocity available in the literature and discussed star by star. We measured the rotation periods of 112 out of 117 among bona fide members and candidate members of the beta Pictoris association and, whenever possible, we also measured the luminosity, radius, and inclination of the stellar rotation axis. This represents to date the largest catalog of rotation periods of any young loose stellar association. We provided an extensive catalog of rotation periods together with other relevant basic properties useful to explore a number of open issues, such as the causes of spread of rotation periods among coeval stars, evolution of angular momentum, and lithium-rotation connection.Comment: Forthcoming article, Received: 20 June 2016 / Accepted: 09 September 2016; 40 pages, 2 figures. The online figures A1-A73 are available at CD

Análise da diversidade da vegetação de uma floresta a ser manejada na Amazônia Ocidental.

As florestas de terra firme na Amazônia são as que ocupam a maior parte das áreas florestadas e vêm sofrendo impacto com a exploração madeireira predatória. É crescente a necessidade de sistemas de exploração florestal que sejam sustentáveis ecológica e economicamente. O manejo florestal de impacto reduzido surge como alternativa, pois nesse sistema é possível diminuir consideravelmente os desperdícios e danos à floresta. Para o acompanhamento da resposta da floresta em regime de manejo é essencial o uso de parcelas permanentes, sendo estas instaladas antes da exploração e remedidas periodicamente. O objetivo do presente estudo foi apresentar a diversidade da vegetação de uma floresta de terra firme observada a partir da instalação de parcelas permanentes

Radio and optical intra-day variability observations of five blazars

We carried out a pilot campaign of radio and optical band intra-day variability (IDV) observations of five blazars (3C66A, S5 0716+714, OJ287, B0925+504, and BL Lacertae) on December 18--21, 2015 by using the radio telescope in Effelsberg (Germany) and several optical telescopes in Asia, Europe, and America. After calibration, the light curves from both 5 GHz radio band and the optical R band were obtained, although the data were not smoothly sampled over the sampling period of about four days. We tentatively analyse the amplitudes and time scales of the variabilities, and any possible periodicity. The blazars vary significantly in the radio (except 3C66A and BL Lacertae with only marginal variations) and optical bands on intra- and inter-day time scales, and the source B0925+504 exhibits a strong quasi-periodic radio variability. No significant correlation between the radio- and optical-band variability appears in the five sources, which we attribute to the radio IDV being dominated by interstellar scintillation whereas the optical variability comes from the source itself. However, the radio- and optical-band variations appear to be weakly correlated in some sources and should be investigated based on well-sampled data from future observations.Comment: 6 pages, 6 figures, accepted by MNRA

Does the process of passive forest restoration affect the hydrophysical attributes of the soil superficial horizon?

There has been an increase in the area of secondary tropical forests in recent years due to forest restoration in degraded areas. Recent analyses suggest that the success of passive forest restoration is highly uncertain and needs to be better understood. This study aimed to investigate the behavior of saturated hydraulic conductivity (Ks) and some hydrophysical soil attributes between agricultural land uses, restored forests, and a degraded forest fragment. The areas evaluated are located in the municipality of Rio Claro, Sao Paulo, Brazil, under different types of land use: (i) two areas in the process of passive forest restoration: one of 18 and another of 42 years (NR18 and NR42); (ii) a degraded forest fragment (FFD); (iii) pasture (P), and (iv) sugarcane (SC). The hydraulic soil conductivity characterization was performed using the Beerkan method. Dry soil bulk density (BD), total porosity (Pt), macroporosity (Mac), microporosity (Mic), penetration resistance (PR), mean aggregate diameter (MWD), and soil organic carbon (OC) were also determined. The comparative analysis of the hydrophysical attributes of the soil superficial horizon in agricultural land uses (P and SC), restored forests (NR18 and NR42), and a degraded forest (DFF) confirms that the recovery of soil hydrological functioning in ongoing forest restoration processes can be a relatively slow process. In addition, the intensity of previous land use leaves footprints that can affect passive restoration areas for decades after agriculture abandonment, increasing the time for the recovery of Ks and soil hydrophysical attributes

'BRS Vitória': a novel seedless table grape cultivar exhibiting special flavor and tolerance to downy mildew (Pasmopara viticola).

'BRS Vitória' is a novel cultivar of black seedless table grape. Its main traits meet the most important demands from the viticulture segment in Brazil. It is recommended for cultivation in tropical and subtropical areas, with excellent horticultural performance, high bud fecundity and resistance to downy mildew, the most important disease which affects grapevines in Brazil.Cultivar release

'BRS Vitória': nova cultivar de uva de mesa sem sementes com sabor especial e tolerante ao míldio.

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Análise das taxas de recrutamento e mortalidade para 12 espécies madeireiras em uma floresta na Amazônia Ocidental.

A exploração madeireira nas florestas Amazônicas vem crescendo nas últimas décadas. Junto a esse crescimento, vem também a degradação da flor esta, sendo necessário um sistema de exploração florestal que cause o menor impacto possível a floresta e que seja sustentável ao longo de vários ciclos. O estudo de como a floresta se comporta ao longo do tempo é fundamental para saber se a atividade nela realizada é sustentável. Para entender a dinâmica da floresta são usados algumas variáveis, como: demografia, densidade, diversidade, mortalidade, recrutamento entre outros. Considera-se que em florestas não perturbadas ocorre um equilíbrio dinâmico, onde os indivíduos mortos são substituídos ao longo do tempo por novos indivíduos (recrutas). Neste trabalho é apresentada a análise de alguns desses indicadores para espécies madeireiras em uma floresta manejada sobre regime de manejo florestal de impacto reduzido