Viable entanglement detection of unknown mixed states in low dimensions

We explore procedures to detect entanglement of unknown mixed states, which can be experimentally viable. The heart of the method is a hierarchy of simple feasibility problems, which provides sufficient conditions to entanglement. Our numerical investigations indicate that the entanglement is detected with a cost which is much lower than full state tomography. The procedure is applicable to both free and bound entanglement, and involves only single copy measurements.Comment: 8 pages, 9 figures, 4 table

Thermal instability of an expanding dusty plasma with equilibrium cooling

We present an analysis of radiation induced instabilities in an expanding plasma with considerable presence of dust particles and equilibrium cooling. We have shown that the equilibrium expansion and cooling destabilize the radiation condensation modes and the presence of dust particles enhances this effect. We have examined our results in the context of ionized, dusty-plasma environments such as those found in planetary nebulae (PNe). We show that due to the non-static equilibrium and finite equilibrium cooling, small-scale localized structures formed out of thermal instability, become transient, which agrees with the observational results. The dust-charge fluctuation is found to heavily suppress these instabilities, though in view of non-availability of convincing experimental data, a definitive conclusion could not be made.Comment: 23 pages, 14 figure

Avaliação cachos em genótipos de Oenocarpus Mapora karsten.

Oenocarpus mapora Karsten, conhecida por bacabi é uma palmeira perene nativa da Amazônia, cujos frutos são consumidos na Amazônia. Apesar de seus frutos possuírem excelentes características organolépticas, com perspectivas agroindustriais para polpa processada e na produção de azeite, similar ao de oliva ainda é carente de estudos que possam contribuir para seu uso em escala comercial. O objetivo deste trabalho foi utilizar cachos para avaliar genótipos de bacabi. Foram avaliados cachos com frutos em plena maturação de 16 genótipos de bacabi pertencentes ao Banco de Germoplasma de Bacabas (BAG ? Bacabas) da Embrapa Amazônia Oriental. Os cachos foram avaliados por seis caracteres. Os dados obtidos foram analisados por estatística descritiva. Os cachos pesaram, em média, 1,8 kg com 1,1 kg representando frutos, com 49,6 ráquilas, 13,1 cm de comprimento, 464,3 g para peso de cem frutos e 59,2% de rendimento de frutos por cacho. Todos os caracteres exibiram consideráveis variações. Nove genótipos tiveram excelente rendimento de frutos por cacho e dois deles apresentaram frutos pequenos, características desejáveis ao mercado de polpa. Com base no exposto, pode se considerar preliminarmente que os genótipos de bacabi mostram potencialidades.VII ENAAG

Avaliação de caracteres de cacho em acessos de patauazeiro.

O patauá (Oenocarpus bataua Mart.) é uma palmeira nativa da Amazônia que possui importância ecológica e potencial para as populações tradicionais. Assim como as outras espécies do gênero Oenocarpus apresenta potencial ao mercado de polpa processada in natura. As atividades de avaliação e caracterização são importantes para descrição e classificação do material conservado no Banco de germoplasma. O objetivo deste trabalho foi avaliar caracteres de cacho em acessos de patauazeiro. Foi controlada a colheita de cachos com frutos em plena maturação, no período de janeiro/2014 a janeiro/2015, em 17 acesos do Banco Ativo de Germoplasma da Embrapa Amazônia Oriental. Cada cacho colhido foi mensurado para sete caracteres. Com os dados obtidos foram organizados, digitados e analisados por estatística descritiva envolvendo médias, valores mínimos, máximo e coeficiente de variação. No período do estudo os 17 acessos produziram 35 cachos. Os cachos apresentaram em média peso de 15,2 kg, sendo 9,3 kg de frutos, representando rendimentos de 54,7%. Nove acessos produziram cachos com mais de 9,3 kg de frutos, enquanto dez acessos tiveram frutos abaixo de 10 g, sendo considerados interessantes para atender o mercado de polpa processada. Houve variação em todos os caracteres, com destaque para peso de fruto (CV=75,5%). De acordo com os resultados obtidos pode-se considerar que os acessos avaliados possuem potencialidades para o mercado de polpa. No entanto, tais resultados são preliminares e necessitam de mais estudos.VII ENAAG

Metallicity in the Galactic Center: The Arches cluster

We present a quantitative spectral analysis of five very massive stars in the Arches cluster, located near the Galactic center, to determine stellar parameters, stellar wind properties and, most importantly, metallicity content. The analysis uses a new technique, presented here for the first time, and uses line-blanketed NLTE wind/atmosphere models fit to high-resolution near-infrared spectra of late-type nitrogen-rich Wolf-Rayet stars and OfI+ stars in the cluster. It relies on the fact that massive stars reach a maximum nitrogen abundance that is related to initial metallicity when they are in the WNL phase. We determine the present-day nitrogen abundance of the WNL stars in the Arches cluster to be 1.6% (mass fraction) and constrain the stellar metallicity in the cluster to be solar. This result is invariant to assumptions about the mass-luminosity relationship, the mass-loss rates, and rotation speeds. In addition, from this analysis, we find the age of the Arches cluster to be 2-2.5Myr, assuming coeval formation

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&

RGB vegetation indices applied to grass monitoring: a qualitative analysis

ArticleIn developing countries such as Brazil, research on low-cost remote sensing and computational techniques become essential for the development of precision agriculture (PA), and improving the quality of the agricultural products. Faced with the scenario of increasing production of emerald grass (Zoysia Japônica) in Brazil, and the value added the quality of this agricultural product. The objective of this work was to evaluate the performance of RGB (IV) vegetation indices in the identification of exposed soil and vegetation. The study was developed in an irrigated area of 58 ha cultivated with emerald grass at Bom Sucesso, Minas Gerais, Brazil. The images were obtained by a RGB digital camera coupled to an remotely piloted aircraft. The flight plan was setup to take overlapping images of 70% and the aircraft speed was 10 m s -1 . Six RGB Vegetation index (MGVRI, GLI, RGBVI, MPRI, VEG, ExG) were evaluated in a mosaic resulting from the images of the study area. All of the VIs evaluated were affected by the variability of lighting conditions in the area but MPRI and MGVRI were the ones that presented the best results in a qualitative evaluation regarding the discrimination of vegetation and soil

Acceptance of dishes based on mechanically separated meat of tambaqui (Colossoma macropomum) in a public school, Brazil.

In Brazil, due to economic and social factors, public policies are needed to grant access to quality nutrition in school. This provision should respect the local food culture; however, in the North, the region with the highest production of inland fisheries, fish consumption among students is still very low. The aim of the present study is to characterize Tambaqui (Colossoma macropomum) MSM, suggest planned school dishes based on this MSM and assesses their acceptability among students at the elementary and high school levels in northern Brazil. The study was carried out over one month and was a quantitative (hedonic scale and leftover/intake index) and qualitative research about preference. The participants were 120 elementary- and high-school students chosen randomly after they were authorized by their parents or legal guardians. Fish-based dishes were inserted in the diet of schoolchildren and their acceptability was evaluated. The children were also inquired about their fish consumption routines. The statistical analyses used were frequency tables and chi-squared independence test associated with Fisher?s exact test. Two dishes were well accepted by the students; however, the results showed that fish acceptance among younger students are higher than among adolescents. So, policies that promote fish intake and a healthy lifestyle must be stimulated since the early grades