LaTEX: uma ferramenta para edição de textos técnico-científicos de alta qualidade.

bitstream/CNPDIA-2009-09/11068/1/CiT38_2007.pd

The WFCAM Multi-wavelength Variable Star Catalog

Stellar variability in the near-infrared (NIR) remains largely unexplored. The exploitation of public science archives with data-mining methods offers a perspective for the time-domain exploration of the NIR sky. We perform a comprehensive search for stellar variability using the optical-NIR multi-band photometric data in the public Calibration Database of the WFCAM Science Archive (WSA), with the aim of contributing to the general census of variable stars, and to extend the current scarce inventory of accurate NIR light curves for a number of variable star classes. We introduce new variability indices designed for multi-band data with correlated sampling, and apply them for pre-selecting variable star candidates, i.e., light curves that are dominated by correlated variations, from noise-dominated ones. Pre-selection criteria are established by robust numerical tests for evaluating the response of variability indices to colored noise characteristic to the data. We find 275 periodic variable stars and an additional 44 objects with suspected variability with uncertain periods or apparently aperiodic variation. Only 44 of these objects had been previously known, including 11 RR~Lyrae stars in the outskirts of the globular cluster M3 (NGC~5272). We provide a preliminary classification of the new variable stars that have well-measured light curves, but the variability types of a large number of objects remain ambiguous. We classify most of the new variables as contact binary stars, but we also find several pulsating stars, among which 34 are probably new field RR~Lyrae and 3 are likely Cepheids. We also identify 32 highly reddened variable objects close to previously known dark nebulae, suggesting that these are embedded young stellar objects. We publish our results and all light-curve data as the WFCAM Variable Star Catalog.Comment: 21 pages, 11 figure

Estimativa de custo de sistema de produção de arroz, milho e mandioca no município de Igarape-Açu, Pará.

bitstream/item/57474/1/CPATU-ComTec83.pd

Stellar parameters for stars of the CoRoT exoplanet field

Aims:To support the computation and evolutionary interpretation of periods associated with the rotational modulation, oscillations, and variability of stars located in the CoRoT fields, we are conducting a spectroscopic survey for stars located in the fields already observed by the satellite. These observations allow us to compute physical and chemical parameters for our stellar sample. Method: Using spectroscopic observations obtained with UVES/VLT and Hydra/Blanco, and based on standard analysis techniques, we computed physical and chemical parameters ($T_{\rm{eff}}$, $\log \,(g)$, $\rm{[Fe/H]}$, $v_{\rm{mic}}$, $v_{\rm{rad}}$, $v \sin \,(i)$, and $A(\rm{Li})$) for a large sample of CoRoT targets. Results: We provide physical and chemical parameters for a sample comprised of 138 CoRoT targets. Our analysis shows the stars in our sample are located in different evolutionary stages, ranging from the main sequence to the red giant branch, and range in spectral type from F to K. The physical and chemical properties for the stellar sample are in agreement with typical values reported for FGK stars. However, we report three stars presenting abnormal lithium behavior in the CoRoT fields. These parameters allow us to properly characterize the intrinsic properties of the stars in these fields. Our results reveal important differences in the distributions of metallicity, $T_{\rm eff}$, and evolutionary status for stars belonging to different CoRoT fields, in agreement with results obtained independently from ground-based photometric surveys. Conclusions: Our spectroscopic catalog, by providing much-needed spectroscopic information for a large sample of CoRoT targets, will be of key importance for the successful accomplishment of several different programs related to the CoRoT mission, thus it will help further boost the scientific return associated with this space mission.Comment: 43 pages, 17 figures, accepted for publication in A&

Teores de potássio no solo, estado nutricional e produção de matéria seca de alfafa em função de doses e frequência da adubação potássica após dois anos de cultivo.

bitstream/item/72342/1/PROCI-2012.00195.pd

Comportamento, no sul de Minas, de progênies de cafeeiros com resistência à ferrugem, selecionadas de diversos ensaios do Procafé.

No presente trabalho foram reunidas, em 2 ensaios, em execução na FEX Varginha, 30 progênies no primeiro ensaio e 32 no segundo, correspondentes a plantas selecionadas de ensaios anteriores de diferentes áreas, principalmente de seleções feitas em Varginha, e, também, de Mal Floriano-ES, de Patrocínio, e do CEPEC em Martins Soares. Os ensaios são catalogados como 3-32 e 3-35 na FEX do Procafé em Varginha. Eles foram delineados em blocos ao acaso, com 3 repetições e parcelas de 6 plantas. No ensaio 3-32 o plantio foi efetuado em janeiro de 2004 e no ensaio 3-35 em janeiro de 2005.O espaçamento usado foi de 3,5 x 1 m. Os tratos culturais foram os usuais, com 2 aplicações de fungicidas triazóis mais cúpricos, para controle da ferrugem e cercosporiose, em todo o ensaio

AN ATTEMPT TO LINK THE BRAZILIAN HEIGHT SYSTEM TO A WORLD HEIGHT SYSTEM

This paper deals with the geopotential approach to investigate the present BrazilianHeight System (BHS). Geopotential numbers are derived from Global PositioningSystem (GPS) satellite surveying and disturbing potential on selected benchmarks.A model for the disturbing potential can be obtained by an existing set of sphericalharmonic coefficients such as the Earth Gravity Model 2008 (EGM08). Theapproach provides absolute evaluation of local normal geopotential numbers (akaspheropotential numbers) related to a so-called World Height System (WHS). Totest the validity of the proposed methodology, a numerical experiment was carriedout related to a test region in Southern Brazil. The accuracy of the derivedgeopotential numbers was tested versus local normal geopotential numbers based on262 GPS/leveling points. The root mean square error (RMSE) value for metricoffset of BHS derived from geopotential numbers and the disturbing potentialmodeling in the test area was estimated to be near 0.224 meters in the absolute view.Therefore, since these spheropotential numbers are referred to a local datum, theseresults of comparisons may be an indicator of the mean bias of local network due tothe effect of local Sea Surface Topography (SSTop) and possible offset between theunknown reference for the BHS and the quasigeoid model in the region

O estudo de medidas repetidas: uma aplicação a dados de forrageiras.

Os resumos na seguinte fonte: In: REUNIÃO ANUAL DA REGIÃO BRASILEIRA DA SOCIEDADE INTERNACIONAL DE BIOMETRIA, 52.; SIMPÓSIO DE ESTATÍSTICA APLICADA À EXPERIMENTAÇÃO AGRONÔMICA, 12, 2007, Santa Maria, RS. Resumos... Santa Maria: UFSM; RBRAS, 2007