The HERMES Solar Atlas and the spectroscopic analysis of the seismic solar analogue KIC3241581

Solar-analog stars provide an excellent opportunity to study the Sun's evolution, i.e. the changes with time in stellar structure, activity, or rotation for solar-like stars. The unparalleled photometric data from the NASA space telescope Kepler allows us to study and characterise solar-like stars through asteroseismology. We aim to spectroscopically investigate the fundamental parameter and chromospheric activity of solar analogues and twins, based on observations obtained with the HERMES spectrograph and combine them with asteroseismology. Therefore, we need to build a solar atlas for the spectrograph, to provide accurate calibrations of the spectroscopically determined abundances of solar and late type stars observed with this instrument and thus perform differential spectral comparisons. We acquire high-resolution and high signal-to-noise spectroscopy to construct three solar reference spectra by observing the reflected light of Vesta and Victoria asteroids and Europa (100<S/N<450) with the \Hermes spectrograph. We then observe the Kepler solar analog KIC3241581 (S/N~170). We constructed three solar spectrum atlases from 385 to 900 nm obtained with the Hermes spectrograph from observations of two bright asteroids and Europa. A comparison between our solar spectra atlas to the Kurucz and HARPS solar spectrum shows an excellent agreement. KIC3241581 was found to be a long-periodic binary system. The fundamental parameter for the stellar primary component are Teff=5689+/-11K, logg=4.385+/-0.005, [Fe/H]=+0.22+/-0.01, being in agreement with the published global seismic values confirming its status of solar analogue. KIC 3241581 is a metal rich solar analogue with a solar-like activity level in a binary system of unknown period. The chromospheric activity level is compatible to the solar magnetic activity.Comment: 12 pages, 8 figures, accepted for publication in A&

A Remark on Lorentz Violation at Finite Temperature

We investigate the radiatively induced Chern-Simons-like term in four-dimensional field theory at finite temperature. The Chern-Simons-like term is temperature dependent and breaks the Lorentz and CPT symmetries. We find that this term remains undetermined although it can be found unambiguously in different regularization schemes at finite temperature.Comment: To appear in JHEP, 8 pages, 1 eps figure, minor changes and references adde

Economic Feasibility Study of Photovoltaic Panels Installation by PVsyst 6.73 Simulator

The increasing pursuit of industry modernization presenting efficiency gains, productivity and cost reduction raises the discussion about the use of new technologies that promote, simultaneously, business sustainability and productive and economic efficiency for offshore companies, which operates in the Campos Basin, located at the municipality of Macaé, Rio de Janeiro State, Brazil. This paper presents an economic feasibility evaluation to use photovoltaic panels in order to measure the project costs and highlight its benefits; to this end, a local supplier was contacted to estimate a budget. The author ran the PVsyst 6.73 simulator to calculate the energy produced by the photovoltaic system and other parameters. Taking into account the Minimum Attractive Rate (MAR) of 8,3 percent, established by the board of directors, the results, by the Simple Payback and Discounted Payback (SPDP); Profitability Index (PI); Return on Investment (ROI); Net Present Value (NPV); and Internal Rate of Return (IRR) methods applied, proved the project is economically feasible and that this company has physical structure to install the equipment. As such, it is possible to have a great medium-and long-term financial economy, contributing to produce clean energy in the country

On the nature of Lithium-rich giant stars: constraints from Beryllium abundances

We have derived beryllium abundances for 7 Li-rich giant (A(Li) > 1.5) stars and 10 other Li-normal giants, with the aim of investigating the origin of the Lithium in the Li-rich giants. In particular, we test the predictions of the engulfment scenario proposed by Siess & Livio (1999), where the engulfment of a brown dwarf or one or more giant planets would lead to a simultaneous enrichment of 7Li and 9Be. We show that regardless their nature, none of the stars studied in this paper were found to have detectable beryllium. Using simple dilution arguments we show that the engulfment of an external object as the sole source of Li enrichment is ruled out by the Li and Be abundance data. The present results favor the idea that Li has been produced in the interior of the stars by a Cameron-Fowler process and brought up to the surface by an extra mixing mechanism.Comment: Accepted in A&

Modelo de Gestión de un Plan de Desarrollo Productivo Local. El Caso de Nova Friburgo, Brasil

La presente investigación trata del análisis del impacto de la innovación en las deficiencias que aparecen listadas en el Plan de Desarrollo del Sistema Productivo Local (SPL) de Moda Íntima de Nova Friburgo, según la percepción de su Administración. Inicialmente fueron investigadas las principales ideas de la Administración del SPL sobre las  innovaciones y nuevas tecnologías. Primeramente en función del desempeño de los factores que influyen en el desarrollo del SPL (fundamentalmente las innovaciones y las nuevas tecnologías) y seguidamente a partir de la influencia de esos factores en las deficiencias presentes en el SPL. Cinco gestores de la Administración fueron sometidos a tres cuestionarios estructurados. Las respuestas, llevadas para un formato numérico, originaron un indicador de impacto relativo el cual fue utilizado para evaluar el impacto que podrían tener las innovaciones en las deficiencias mencionadas. Los resultados de la investigación sugieren  que el proceso de innovación posee un débil desempeño en el SPL y ejerce un impacto bajo cuando se trata de atenuar las deficiencias de este

Recomendações técnicas para o cultivo de hortaliças em agricultura familiar.

bitstream/CNPH-2009/33346/1/ct_47.pd

Um modelo de gestão para o Tipitamba.

O presente trabalho teve como objetivo propor um modelo de gestão para o projeto Studies of Human Impact Forest and Floodplains in the Tropics, bmb + f, CNPq/MC ? SHIFT- capoeira, hoje denominado de Tipitamba. O Tipitamba, na língua dos índios Tiriyó, do norte do Estado do Pará, quer dizer ex-roça ou capoeira e tem como principal proposta desenvolver novas alternativas de cultivo na Amazônia sem a utilização do fogo, por meio do manejo da vegetação secundária ? capoeira ? em descanso. Quanto à metodologia, trata-se de uma pesquisa qualitativa, especificamente um estudo de casos, na qual os dados foram coletados por meio de entrevistas semi-estruturadas junto aos agricultores e agentes comunitários do município de Igarapé-Açu e equipe da Embrapa participante do Tipitamba. A tabulação dos dados foi feita por meio da análise de conteúdo com intuito de obter informações que subsidiassem a elaboração de uma porposta de modelo de gestão para o Tipitamba. A estrutura proposta apresenta um Comitê Gestor Central no nível estratégico, gerência de produção, marketing, finanças e pessoas no nível tático e a unidade de Igarapé-Açu no nível operacional.Editores técnicos: Roberto Porro, Milton Kanashiro, Maria do Socorro Gonçalves Ferreira, Leila Sobral Sampaio e Gladys Ferreira de Sousa

Photospheric and chromospheric magnetic activity of seismic solar analogs. Observational inputs on the solar/stellar connection from Kepler and Hermes

We identify a set of 18 solar analogs among the seismic sample of solar-like stars observed by the Kepler satellite rotating between 10 and 40 days. This set is constructed using the asteroseismic stellar properties derived using either the global oscillation properties or the individual acoustic frequencies. We measure the magnetic activity properties of these stars using observations collected by the photometric Kepler satellite and by the ground-based, high-resolution Hermes spectrograph mounted on the Mercator telescope. The photospheric (Sph) and chromospheric (S index) magnetic activity levels of these seismic solar analogs are estimated and compared in relation to the solar activity. We show that the activity of the Sun is comparable to the activity of the seismic solar analogs, within the maximum-to-minimum temporal variations of the 11-year solar activity cycle 23. In agreement with previous studies, the youngest stars and fastest rotators in our sample are actually the most active. The activity of stars older than the Sun seems to not evolve much with age. Furthermore, the comparison of the photospheric, Sph, with the well-established chromospheric, S index, indicates that the Sph index can be used to provide a suitable magnetic activity proxy which can be easily estimated for a large number of stars from space photometric observations.Comment: Accepted for publication in A&