J/psi suppression at SPS and RHIC in the comovers approach

The NA50 collaboration data on the $J/\psi$ suppression are compared with the results obtained in a comovers approach based on the Dual Parton Model (DPM). Predictions for the $J/\psi$ suppression versus the charged multiplicity - measured in the rapidity region of the dimuon trigger - are given for SPS and RHIC energies.Comment: 4 pages, contribution to QM200

Monte Carlo model for nuclear collisions from SPS to LHC energies

A Monte Carlo model to simulate nuclear collisions in the energy range going from SPS to LHC, is presented. The model includes in its initial stage both soft and semihard components, which lead to the formation of color strings. Collectivity is taken into account considering the possibility of strings in color representations higher than triplet or antitriplet, by means of string fusion. String breaking leads to the production of secondaries. At this point, the model can be used as initial condition for further evolution by a transport model. In order to tune the parameters and see the results in nucleus-nucleus collisions, a naif model for rescattering of secondaries is introduced. Results of the model are compared with experimental data, and predictions for RHIC and LHC are shown.Comment: LaTeX, 48 pages, 6 tables, 15 postscript figures included using epsfi

NIR spectroscopy of the Sun and HD20010 - Compiling a new linelist in the NIR

Context: Effective temperature, surface gravity, and metallicity are basic spectroscopic stellar parameters necessary to characterize a star or a planetary system. Reliable atmospheric parameters for FGK stars have been obtained mostly from methods that relay on high resolution and high signal-to-noise optical spectroscopy. The advent of a new generation of high resolution near-IR spectrographs opens the possibility of using classic spectroscopic methods with high resolution and high signal-to-noise in the NIR spectral window. Aims: We aim to compile a new iron line list in the NIR from a solar spectrum to derive precise stellar atmospheric parameters, comparable to the ones already obtained from high resolution optical spectra. The spectral range covers 10 000 {\AA} to 25 000 {\AA}, which is equivalent to the Y, J, H, and K bands. Methods: Our spectroscopic analysis is based on the iron excitation and ionization balance done in LTE. We use a high resolution and high signal-to-noise ratio spectrum of the Sun from the Kitt Peak telescope as a starting point to compile the iron line list. The oscillator strengths (log gf) of the iron lines were calibrated for the Sun. The abundance analysis was done using the MOOG code after measuring equivalent widths of 357 solar iron lines. Results: We successfully derived stellar atmospheric parameters for the Sun. Furthermore, we analysed HD20010, a F8IV star, from which we derived stellar atmospheric parameters using the same line list as for the Sun. The spectrum was obtained from the CRIRES- POP database. The results are compatible with the ones found in the literature, confirming the reliability of our line list. However, due to the quality of the data we obtain large errors.Comment: 9 pages and 9 figure

Análise da situação da ATEPA (Assistência Técnica e Extensão Pesqueira e Aquícola) no Tocantins: perspectivas e entraves.

O presente estudo tem como objetivo geral analisar a situação dos serviços de ATEPA (Assistência Técnica e Extensão Pesqueira e Aquícola) no Tocantins e, especificamente, mapear e caracterizar as empresas prestadoras de ATEPA; e caracterizar o perfil dos extensionistas que atuam no setor pesqueiro. O estudo tem caráter exploratório-descritivo utilizando-se de fontes primárias, com o apoio da técnica de entrevista semi-estruturada, além de fontes secundárias.Organizado por: Sílvio Ricardo Maurano; AQUACIÊNCIA 2012

Avaliação de genótipos de trigo e de outros cereais de inverno ao crestamento, em solo com e sem aplicação de calcário.

bitstream/CNPT-2010/40694/1/p-do76.pd

The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample

Searching for extrasolar planets around stars of different metallicity may provide strong constraints to the models of planet formation and evolution. In this paper we present the overall results of a HARPS (a high-precision spectrograph mostly dedicated to deriving precise radial velocities) program to search for planets orbiting a sample of 104 metal-poor stars (selected [Fe/H] below -0.5). Radial velocity time series of each star are presented and searched for signals using several statistical diagnostics. Stars with detected signals are presented, including 3 attributed to the presence of previously announced giant planets orbiting the stars HD171028, HD181720, and HD190984. Several binary stars and at least one case of a coherent signal caused by activity-related phenomena are presented. One very promising new, possible giant planet orbiting the star HD107094 is discussed, and the results are analyzed in light of the metallicity-giant planet correlation. We conclude that the frequency of giant planets orbiting metal-poor stars may be higher than previously thought, probably reflecting the higher precision of the HARPS survey. In the metallicity domain of our sample, we also find evidence that the frequency of planets is a steeply rising function of the stellar metal content, as found for higher metallicity stars.Comment: Accepted for publication in A&

Princípios cooperativistas e cooperativismo de crédito: Um estudo de caso em Paraíso do Tocantins, Brasil.

O objetivo foi identificar a prática dos princípios cooperativas em uma cooperativa de crédito na percepção dos dirigentes, além de observar se as metas traçadas pelos dirigentes seguem a linha dos princípios cooperativistas. A pesquisa é exploratória de caráter qualitativo e tendo como metodologia o estudo de caso, com o apoio da técnica entrevista semi-estruturada. Entre os resultados, notou-se que a cooperativa segue parcialmente os princípios do cooperativismo, identificou-se que a comunicação está deficiente e é um ponto que deve ser fortalecido, o que facilitaria o desenvolvimento da cooperativa

Well´s syndrome: report of two cases

A síndrome de Wells, também conhecido como celulite eosinofílica, é uma patologia cutânea rara. As lesões clínicas características incluem pápulas, vesículas ou grandes placas eritematosas, que podem aparecer em toda a superfície corporal, podendo mimetizar um quadro de urticária crónica. Os autores apresentam dois casos clínicos de doentes com o diagnóstico de S. Wells: doente 1, sexo feminino, 41 anos e doente 2, sexo masculino, 40 anos. Ambos apresentavam um quadro clínico de lesões maculopapulares generalizadas, pruriginosas recorrentes, que persistiam pelo menos 24 horas, refractárias a anti -histamínicos, com necessidade frequente de corticoterapia sistémica para controlo sintomatológico. Como sintomas associados salientam -se astenia, mialgias e artralgias. O estudo complementar em ambos os casos excluiu a presença doutra patologia associada e as biópsias cutâneas revelaram celulite eosinofílica. Ambos efectuaram dapsona 100 mg/dia com evolução clínica favorável. Estes casos demonstram a necessidade do estudo histopatológico cutâneo em doentes com lesões urticariformes com necessidade de recorrer frequentemente aos corticóides sistémicos e com reaparecimento das lesões com a redução ou interrupção destes fármacos