Black-Hole Mass and Growth Rate at High Redshift

We present new H and K bands spectroscopy of 15 high luminosity active galactic nuclei (AGNs) at redshifts 2.3-3.4 obtained on Gemini South. We combined the data with spectra of additional 29 high-luminosity sources to obtain a sample with 10^{45.2}<\lambda L_{\lambda}(5100A)<10^{47.3} ergs/sec and black hole (BH) mass range, using reverberation mapping relationships based on the H_beta method, of 10^{8.8}-10^{10.7} M_sun. We do not find a correlation of L/L_Edd with M_BH but find a correlation with \lambda L_{\lambda}(5100A) which might be due to selection effects. The L/L_Edd distribution is broad and covers the range ~0.07-1.6, similar to what is observed in lower redshift, lower luminosity AGNs. We suggest that this consistently measured and calibrated sample gives the best representation of L/L_Edd at those redshifts and note potential discrepancies with recent theoretical and observational studies. The lower accretion rates are not in accord with growth scenarios for BHs at such redshifts and the growth times of many of the sources are longer than the age of the universe at the corresponding epochs. This suggests earlier episodes of faster growth at z>~3 for those sources. The use of the C IV method gives considerably different results and a larger scatter; this method seems to be a poor M_BH and L/L_Edd estimator at very high luminosity.Comment: 8 pages (emulateapj), 4 figures. Accepted for publication in Ap

Caracterização clínica dos cães diabéticos atendidos no Hovet Unisa

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Avaliação do consumo de açúcar/sacarose nos alunos do curso de Odontologia do UniFOA

Durante os últimos anos, em especial devido ao aumento do consumo de açúcar nas grandes concentrações populacionais, o número de doenças associadas a este consumo tem repercutido na saúde humana, destacando-se entre essas doenças a cárie dentária. O Curso de Odontologia do UniFOA está localizado no campus Olezio Galotti no bairro Três Poços em Volta Redonda no estado do Rio de Janeiro, possuindo em suas instalações 3 restaurantes e 4 lanchonetes, onde são oferecidos alimentos que apresentam sacarose em sua composição, sendo esse, apontado como o principal substrato para desenvolvimento da doença cárie. No presente estudo foram selecionados aleatoriamente 64 acadêmicos matriculados no curso de Odontologia no período de julho de 2008 a julho de 2009. Foi realizado a partir da aplicação de um questionário contendo perguntas a respeito dos hábitos alimentares dos alunos, com ênfase no consumo de açúcar e sacarose. Foram avaliados o padrão do consumo de açúcar que os acadêmicos adotam para si próprios, ou adotarão na dieta de seus filhos, razões para restrição do consumo de açúcar de seus pacientes, e se os mesmos se consideram capazes de controlar e orientar o consumo de açúcar. Para a organização dos dados, foi utilizado o programa Microsoft Excel versão 2007. Os resultados foram apresentados em tabelas, e toda a análise foi realizada através de cálculo numérico e percentual. O objetivo foi o de estudar os padrões de consumo de açúcar e sacarose nos alunos do Curso de Odontologia do UniFOA, analisando mudanças de comportamento em relação a esse consumo

Zoneamento para o cultivo do café robusta (Coffea canephora Pierre) no Estado de Mato Grosso.

bitstream/item/24687/1/COT2005105.pdfDocumento on-line

Characterization of Fuji Apples from Different Harvest Dates and Storage Conditions from Measurements of Volatiles by Gas Chromatography and Electronic Nose

Volatile compounds in Fuji apples harvested at two different maturities were measured at harvest and after 5 and 7 months of cold storage (1 °C) in four different atmospheres. When the samples were characterized by both chromatographic measurements of volatiles and responses of an electronic nose, the analyses showed a clear separation between fruits from different storage conditions (a normal cold atmosphere and three controlled atmospheres). During poststorage, the apples were left to ripen for 1, 5, and 10 days at 20 °C before analytical measurements were done involving headspace-gas chromatography methods and electronic nose type quartz crystal microbalances. Electronic nose responses registered by seven different sensors were used to classify the apples using principal component analysis. It was possible to identify the samples from different storage periods, days of shelf life, and harvest dates, but it was not possible to differentiate the fruits corresponding to different cold storage atmospheres

Electron paramagnetic resonance signature of point defects in neutron-irradiated hexagonal boron nitride

© 2018 American Physical Society. Hexagonal boron nitride (h-BN) is an attractive van der Waals material for studying fluorescent defects due to its large band gap. In this work, we demonstrate enhanced pink color due to neutron irradiation and perform electron paramagnetic resonance (EPR) measurements. The point defects are tentatively assigned to doubly occupied nitrogen vacancies with (S=1) and a zero-field splitting (D=1.2GHz). These defects are associated with a broad visible optical absorption band and a near-infrared photoluminescence band centered at ∼490 and 820 nm, respectively. The EPR signal intensities are strongly affected by thermal treatments in the temperature range between 600 °C and 800 °C, where also the irradiation-induced pink color is lost. Our results are important for understanding of point defects in h-BN and their deployment for quantum and integrated photonic applications

Chemical Composition and Botanical Origin of Red Propolis, a New Type of Brazilian Propolis

Red propolis is a new type of Brazilian propolis. This material, as well as the secretions of 20 plant species that are often mentioned as its probable botanical source, have been investigated by RP-HPTLC. Phytochemical evidence based on UV-VIS spectra, RP-HPLC and GC-MS, showed Dalbergia ecastophyllum (L.) Taub. to be the main source of red propolis in Alagoas state. The propolis and plant resin showed high relative percentages of the isoflavonoids 3-Hydroxy-8,9-dimethoxypterocarpan and medicarpin. To our knowledge this is the first report of the secretion of a leguminous species being the source of propolis