10,762 research outputs found
A Multi-Membership Catalogue for 1876 Open Clusters using UCAC4 data
The main objective of this work is to determine the cluster members of 1876
open clusters, using positions and proper motions of the astrometric catalogue
UCAC4. For this purpose we apply three different methods, all them based on a
Bayesian approach, but with different formulations: a purely parametric method,
another completely non-parametric algorithm, and a third, recently developed by
Sampedro & Alfaro, using both formulations at different steps of the whole
process. The first and second statistical moments of the members phase-space
subspace, obtained after applying the three methods, are compared for every
cluster. Although, on average, the three methods yield similar results,
specific differences between them, as well as for some particular clusters, are
also present. The comparison with other published catalogues shows good
agreement. We have also estimated for the first time the mean proper motion for
a sample of 18 clusters. The results are organized in a single catalogue formed
by two main files, one with the most relevant information for each cluster,
partially including that in UCAC4, and the other showing the individual
membership probabilities for each star in the cluster area. The final
catalogue, with an interface design that enables an easy interaction with the
user, is available in electronic format at SSG-IAA
(http://ssg.iaa.es/en/content/sampedro-cluster-catalog) website.Comment: Accepted for publication in MNRAS. 9 pages, 3 figures, 6 table
Development of a test method for investigating moisture transfer rate of textiles
Moisture management textiles have proved to be one of the fastest growing sector in textiles. New research and development of these textiles have pushed the boundaries of textile testing equipment as new test methods are required.
This paper will focus on the development of test method with potential application in testing and analyzing of textile fabrics which can be used in moisture management industry. A new system has been developed which allows fabrics moisture transmission to be tested whilst situated between two variable conditions mini chambers. The system allows moisture level to be monitored by precision weight scale and all the real-time data can be controlled and analyzed by computer.
The system was tested by using a knitted spacer fabric and proved to be useful and reliable kit for analysis of moisture transmission at various testing conditions
Signatures of quantum phase transitions in parallel quantum dots: Crossover from local-moment to underscreened spin-1 Kondo physics
We study a strongly interacting "quantum dot 1" and a weakly interacting "dot
2" connected in parallel to metallic leads. Gate voltages can drive the system
between Kondo-quenched and non-Kondo free-moment phases separated by
Kosterlitz-Thouless quantum phase transitions. Away from the immediate vicinity
of the quantum phase transitions, the physical properties retain signatures of
first-order transitions found previously to arise when dot 2 is strictly
noninteracting. As interactions in dot 2 become stronger relative to the
dot-lead coupling, the free moment in the non-Kondo phase evolves smoothly from
an isolated spin-one-half in dot 1 to a many-body doublet arising from the
incomplete Kondo compensation by the leads of a combined dot spin-one. These
limits, which feature very different spin correlations between dot and lead
electrons, can be distinguished by weak-bias conductance measurements performed
at finite temperatures.Comment: 7 pages, 7 figures. Accepted for publication in Phys. Rev.
Potencial de Eucalyptus grandis e Eucalyptus cloeziana para fitoextração de arsênio
Este trabalho teve como objetivo avaliar o potencial de mudas de Eucalyptus grandis Hill ex Maiden, Eucalyptus cloeziana F. Muell, para fitorremediação de solos contaminados por arsênio. Amostras de solo foram incubadas por período de 15 dias com doses crescentes de arsênio (0, 50, 100, 200 e 400 mg dm-3 de As disponível), como fonte utilizou-se o arsenato de sódio (Na2HAsO4). O ensaio foi conduzido por um período de 90 dias após o transplantio. Após 30 dias de exposição o E. cloeziana exibiu pontuações arroxeadas nas folhas basais com clorose internerval seguida de necrose e morte da gema apical na dose de 400 mg dm-3. As doses crescentes de arsênio no solo reduziram significativamente a produção de matéria seca de raízes e parte aérea, altura e diâmetro de planta das ambas às espécies, sendo mais acentuada nas plantas de E. cloeziana. Para as espécies, os maiores teores de As foram observados no sistema radicular, com maiores valores para E. cloeziana (305,72 mg kg-1) na dose de 400 mg dm-3, sendo que o maior acúmulo de As foi observado nas plantas E. grandis, que demonstrou ser uma espécie com potencial para fitoextração de arsênio, com tendências de acumulação no sistema radicular e no caule
Reação de genótipos de milho e sorgo a Meloidogyne incognita, M. javanica e Pratylenchus brachyurus.
Three-dimensional gravity-capillary solitary waves in water of finite depth and related problems
Automated search for star clusters in large multiband surveys: II. Discovery and investigation of open clusters in the Galactic plane
Automated search for star clusters in J,H,K_s data from 2MASS catalog has
been performed using the method developed by Koposov et. al (2008). We have
found and verified 153 new clusters in the interval of the galactic latitude
-24 < b < 24 degrees. Color excesses E(B-V), distance moduli and ages were
determined for 130 new and 14 yet-unstudied known clusters. In this paper, we
publish a catalog of coordinates, diameters, and main parameters of all the
clusters under study. A special web-site available at http://ocl.sai.msu.ru has
been developed to facilitate dissemination and scientific usage of the results.Comment: 9 pages, 3 tables, 5 figures, accepted to Astronomy Letter
Protozoários parasitando brânquias de Hoplosternum littorale (Siluriformas, Callichthyidae) de área de várzea no Estado do Amapá.
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