A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun: I. Atmospheric parameters and color similarity to the Sun

Solar twins and analogs are fundamental in the characterization of the Sun's place in the context of stellar measurements, as they are in understanding how typical the solar properties are in its neighborhood. They are also important for representing sunlight observable in the night sky for diverse photometric and spectroscopic tasks, besides being natural candidates for harboring planetary systems similar to ours and possibly even life-bearing environments. We report a photometric and spectroscopic survey of solar twin stars within 50 pc of the Sun. Hipparcos absolute magnitudes and (B-V)_Tycho colors were used to define a 2 sigma box around the solar values, where 133 stars were considered. Additional stars resembling the solar UBV colors in a broad sense, plus stars present in the lists of Hardorp, were also selected. All objects were ranked by a color-similarity index with respect to the Sun, defined by uvby and BV photometry. Moderately high-resolution, high-S/N spectra were used for a subsample of equatorial-southern stars to derive Teff, log g, and [Fe/H] with average internal errors better than 50 K, 0.20 dex, and 0.08 dex, respectively. Ages and masses were estimated from theoretical HR diagrams. The color-similarity index proved very successful. We identify and rank new excellent solar analogs, which are fit to represent the Sun in the night sky. Some of them are faint enough to be of interest for moderately large telescopes. We also identify two stars with near-UV spectra indistinguishable from the Sun's. We present five new "probable" solar twin stars, besides five new "possible" twins. Masses and ages for the best solar twin candidates lie very close to the solar values, but chromospheric activity levels range somewhat. We propose that the solar twins be emphasized in the ongoing searches for extra-solar planets and SETI searches.Comment: 25 pages, 15 figures, 14 table

Copper and Barium Abundances in the Ursa Major Moving Group

We present Cu and Ba abundances for 7 G-K dwarf stars, members of the solar-metallicity, 0.3 Gyr old Ursa Major Moving Group. All analyzed member stars show [Ba/Fe] excesses of +0.3-plus, associated with [Cu/Fe] deficiencies of up to -0.23 dex. The present results suggest that there is an anti-correlation between the abundances of Cu and the heavy elements produced by the main component of the neutron capture s-process. Other possible anomalies are Na and C deficiencies with respect to normal solar-metallicity stars. The new data do not confirm the recent claim that the group member HR6094 is a Ba dwarf star.Comment: 8 pages, 6 figures, accepted to MNRA

Experimental Demonstration of Dual Polarization Nonlinear Frequency Division Multiplexed Optical Transmission System

Multi-eigenvalues transmission with information encoded simultaneously in both orthogonal polarizations is experimentally demonstrated. Performance below the HD-FEC limit is demonstrated for 8-bits/symbol 1-GBd signals after transmission up to 207 km of SSMF

Dual polarization nonlinear Fourier transform-based optical communication system

New services and applications are causing an exponential increase in internet traffic. In a few years, current fiber optic communication system infrastructure will not be able to meet this demand because fiber nonlinearity dramatically limits the information transmission rate. Eigenvalue communication could potentially overcome these limitations. It relies on a mathematical technique called "nonlinear Fourier transform (NFT)" to exploit the "hidden" linearity of the nonlinear Schr\"odinger equation as the master model for signal propagation in an optical fiber. We present here the theoretical tools describing the NFT for the Manakov system and report on experimental transmission results for dual polarization in fiber optic eigenvalue communications. A transmission of up to 373.5 km with bit error rate less than the hard-decision forward error correction threshold has been achieved. Our results demonstrate that dual-polarization NFT can work in practice and enable an increased spectral efficiency in NFT-based communication systems, which are currently based on single polarization channels

SISTEMA FINANCEIRO E CRESCIMENTO ECONÔMICO: UMA APLICAÇÃO DE REGRESSÃO QUANTÍLICA

This work has as objective to analyze the supposed existing positive relation between financial development and economic growth. The financial system influences the economic growth due to the functions that it plays, such as: ) the mobilization of resources; b) allocation of the resources in the space and the time; c) administration of the risk; d) selection and monitoration of firms; and e) production and spreading of information. It was applied technique of quantile regression to analyze these aspects for data of 77 countries, what it allowed a more complete mapping of the impact generated for the measures of financial development in the conditional distribution of the response varieble (measured of economic growth). The estimates allow us to conclude that: ) it has a positive relation between financial development and economic growth; and b) bigger the quantil (that is, greater the ratio of economic growth) bigger is the contribution of the financial system for the economic growth.

ARTE TERAPIA COMO DISPOSITIVO DE TRATAMENTO PARA PESSOA COM DIAGNÓSTICO DE ESQUIZOFRENIA: UMA REVISÃO DE LITERATURA

Introduction: Arttherapy as a treatment device for peoplediagnosedwithschizophreniahasbroughtseveralbenefitstopatients, sincethetherapeuticpowerofartis in theintegrationbetweendoingand feeling, making peopleappropriatetheircontent, promotingnotonlytheknowledgeoftheirsuffering, butmainlyoftheirpossibilitiesofrecovery.Objective:Toidentifythebenefitsofarttherapy in thecareprocess for peoplediagnosedwithschizophrenia. MaterialsandMethods: The constructionofthisstudyconsistedofanintegrativeliterature review where 10 articleswereresearched, whosemethodswerearttherapy as a palliativetreatment in patientswithschizophrenia. ResultsandDiscussion: It wasfoundthatarttherapyhashelped a lot in thetreatmentofpatientswithschizophrenia diagnoses, obtaining a positive response in theirpsychiatriccondition. Conclusion:Thisart came tobring a new concept, wherethe professional breaks theparadigm in whichheseesthepatient as a problem in society, and starts tounderstandhimand helps himtoperceiveandrespondpositivelytotheexpectedgoalsIntrodução:Arte-terapia como dispositivo de tratamento para pessoa com diagnóstico de esquizofreniatem levado diversos benefícios aos pacientes, pois o poder terapêutico da arte está na integração entre o fazer e o sentir, levando a pessoa apropriar de seus conteúdos, promovendo não só o conhecimento do seu sofrimento, mas principalmente das suas possibilidades de recuperação. Objetivo: Identificar os benefícios da arte terapia no processo de cuidado a pessoa com diagnóstico de esquizofrenia. Materiais e Métodos: A construção deste estudo se constituiu através de uma revisão integrativa de literatura onde foram pesquisados 10 artigos cujo os métodos abordados eram a arteterapia como tratamento paliativo em pacientes com esquizofrenia.Resultados e Discussão: Constatou-se que a arteterapia tem ajudado bastante no tratamento de pacientes com diagnósticos de esquizofrenia obtendo uma resposta positiva no seu quadro psiquico.Conclusão: Essa arte veio para trazer uma nova concepção, onde o profissional quebra o paradigma em que ele vê o paciente como um problema da sociedade, e passa a entende-lo e ajuda-lo a se perceber e responder de forma positiva aos objetivos esperados. &nbsp

Assessing the Time Evolution of COVID-19 Effective Reproduction Number in Brazil

In this paper, we use a Bayesian method to estimate the effective reproduction number (R(t)), in the context of monitoring the time evolution of the COVID-19 pandemic in Brazil at different geographic levels. The focus of this study is to investigate the similarities between the trends in the evolution of such indicators at different subnational levels with the trends observed nationally. The underlying question addressed is whether national surveillance of such variables is enough to provide a picture of the epidemic evolution in the country or if it may hide important localized trends. This is particularly relevant in the scenario where health authorities use information obtained from such indicators in the design of non-pharmaceutical intervention policies to control the epidemic. A comparison between R(t) estimates and the moving average (MA) of daily reported infections is also presented, which is another commonly monitored variable. The analysis carried out in this paper is based on the data of confirmed infected cases provided by a public repository. The correlations between the time series of R(t) and MA in different geographic levels are assessed. Comparing national with subnational trends, higher degrees of correlation are found for the time series of R(t) estimates, compared to the MA time series. Nevertheless, differences between national and subnational trends are observed for both indicators, suggesting that local epidemiological surveillance would be more suitable as an input to the design of non-pharmaceutical intervention policies in Brazil, particularly for the least populated states.Comment: Preprint of the manuscript accepted for publication at the Anais da Academia Brasileira de Ci\^encias (AABC) in May 202

Saúde no Brasil: a sífilis na atualidade

Monografia apresentada ao Setor de Pós-graduação da Universidade do Extremo Sul Catarinense - UNESC, para a obtenção do título de especialista em Análises Clínicas.A importância deste estudo é ressaltar a necessidade em conhecer as causas que levam o indivíduo a adquirir a Sífilis e acrescentar diferentes conhecimentos que possam servir de parâmetro para sua prevenção. Trata de uma revisão bibliográfica que teve como dados livros, sites e revistas científicas. Esta pesquisa tem como objetivo geral demonstrar as fases da doença, o diagnóstico por meio das Análises Clínicas e enfatizar a importância da prevenção como ação primordial no crescimento de casos de Sífilis, especialmente na Sífilis congênita onde infecta mais criança por transmissão vertical pelo Treponema Pallidum do que o próprio Vírus da Imunodeficiência Humana tão temida pela população. A baixa idade das primeiras relações sexuais, a variabilidade de parceiros, o não uso de preservativo e o uso de drogas ilícitas são apontados como fatores de risco às doenças sexualmente transmissíveis. Contudo, é possível notar que a Sífilis é uma patologia que deve ser prevenida, sendo extremamente curável. Dessa forma, é possível vencer o desafio e alcançar a sua erradicação