2,508 research outputs found
Incluir com ciência e tecnologia: aproximando a sociedade do conhecimento
Trabalho apresentado no 31º SEURS - Seminário de Extensão Universitária da Região Sul, realizado em Florianópolis, SC, no período de 04 a 07 de agosto de 2013 - Universidade Federal de Santa Catarina.O presente trabalho descreve o programa Incluir com Ciência e Tecnologia da Universidade do Estado de Santa Catarina, coordenado pelo professor André Bittencourt Leal. Tal programa tem como objetivo a inclusão social em diversas dimensões e, para isso, é organizado em três projetos internos: Assistiva - Tecnologia para Inclusão Social, Ciência ao Alcance de Todos e Robótica e Educação
Spatio-temporal variation in the wintering associations of an alpine bird
Many animals make behavioural changes to cope with winter conditions, being gregariousness a common strategy. Several factors have been invoked to explain why gregariousness may evolve during winter, with individuals coming together and separating as they trade off the different costs and benefits of living in groups. These trade-offs may, however, change over space and time as a response to varying environmental conditions. Despite its importance, little is known about the factors triggering gregarious behaviour during winter and its change in response to variation in weather conditions is poorly documented. Here, we aimed at quantifying large-scale patterns in wintering associations over 23 years of the white-winged snowfinch Montifringilla nivalis nivalis. We found that individuals gather in larger groups at sites with harsh wintering conditions. Individuals at colder sites reunite later and separate earlier in the season than at warmer sites. However, the magnitude and phenology of wintering associations are ruled by changes in weather conditions. When the temperature increased or the levels of precipitation decreased, group size substantially decreased, and individuals stayed united in groups for a shorter time. These results shed light on factors driving gregariousness and points to shifting winter climate as an important factor influencing this behaviour.M.d.M.D. was financially supported by the (i) Spanish Ministry of Sciences, Innovation and Universities (no. CGL2016-79764-P) and (ii) a Spanish Ramon y Cajal grant no. RYC-2014-16263. M.B. was partly supported by the project Mediterranean Mosaics II funded by MAVA to Lipu
PROJETO TRILHA SUBAQUÁTICA: SUGESTÃO DE DIRETRIZES PARA A CRIAÇÃO DE MODELOS DE EDUCAÇÃO AMBIENTAL EM UNIDADES DE CONSERVAÇÃO LIGADAS A ECOSSISTEMAS MARINHOS
A educação ambiental (EA) embasa ações de ecoturismo e recreação, instrumentos pró-ativos na gestão de UCs, incluídos dentro de uma de suas atividades-fim, o uso público. Entretanto, para que sejam atingidos os objetivos previstos, é necessário que as atividades de (EA) sejam conceitualmente e operacionalmente bem estruturadas, dentro de modelos educacionais definidos e testados. Mundialmente, atividades de educação ambiental (EA) marinha são raras e criação de modelos é de grande importância no incentivo à sua implementação em UCs marinhas ou que tenham seu entorno atingindo esse ambiente. O presente trabalho descreve e avalia os 7 modelos do Projeto Trilha Subaquática, criado em 2002, como atividade de EA e extensão universitária: Trilha Subaquática (TS) em mergulho livre; TS em mergulho autônomo, Palestra, Aquário Natural, Trilha em Caiaques no Manguezal, Trilha Geológica e TS Virtual. Os modelos foram baseados em um conceito de EA holística, transformadora e multidisciplinar, com abordagem de trilha interpretativa guiada. Entre 2002 e 2006 foram realizadas 5598 atividades, com um número máximo de visitantes em 2004, totalizando 3776 atividades, 2624 ligadas à visitação pública. Entre 2003 e 2004 ao redor de 2000 atividades foram realizadas envolvendo professores e alunos de escolas públicas de Ubatuba, resultando no treinamento de 51 professores. No geral, um impacto emocional intenso foi observado na maioria dos praticantes e o ganho de conhecimentos foi grande. O conjunto de modelos mostrou-se adequado a diferentes perfis de interesses, faixas etárias e níveis de escolaridade. Entretanto, o principal produto do projeto foi a formação, entre 2002 e 2007, de 108 monitores, dos quais 40% permaneceram no projeto por um ou mais anos consecutivos, auxiliando no treinamento dos novos e servindo como agentes multiplicadores. A seleção desses profissionais por gestores de UCs de forma a que possam implementar seu próprio projeto pode ser feita no site www.ib.usp.br/ecosteiros
Metarhizium robertsii and M. acridum conidia produced on riboflavin-supplemented medium have increased UV-A tolerance and upregulated photoprotection and photoreactivation genes
The aim of this study was to evaluate the effect of riboflavin supplementation of culture medium on conidial UV-A tolerance of M. acridum (Driver & Milner) (Hypocreales: Clavicipitaceae) and M. robertsii (Bischoff, Rehner & Humber) (Hypocreales: Clavicipitaceae). These fungi were produced on culture medium supplemented, or not supplemented, with riboflavin. Relative germination and expression patterns of some photoprotection-related genes were evaluated after irradiating with artificial UV-A, or with filtered solar radiation (> 320 nm; UV-A and visible radiation). M. acridum conidia harvested from riboflavin-supplemented culture medium demonstrated enhanced UV-A tolerance when irradiated with artificial UV-A. Nevertheless, relative germination of conidia of both species produced on riboflavin-supplemented medium and exposed to filtered solar radiation was significantly higher than those produced on medium not supplemented with riboflavin. Riboflavin increased the transcription of photolyases, laccases and polyketide synthase genes. However, each fungal species induced different genes patterns involved in DNA repair and photoprotection. The addition of riboflavin to the substrate used for mass production of Metarhizium spp. and the resulting enhancement of conidial tolerance to solar radiation may improve the effectiveness of these fungi in biological control programs.Instituto de Investigaciones Bioquímicas de La Plat
The 2nd competition on counter measures to 2D face spoofing attacks
Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. I. Chingovska, J. Yang, Z. Lei, D. Yi, S. Z. Li, O. Kahm, C. Glaser, N. Damer, A. Kuijper, A. Nouak, J. Komulainen, T. Pereira, S. Gupta, S. Khandelwal, S. Bansal, A. Rai, T. Krishna, D. Goyal, M.-A. Waris, H. Zhang, I. Ahmad, S. Kiranyaz, M. Gabbouj, R. Tronci, M. Pili, N. Sirena, F. Roli, J. Galbally, J. Fiérrez, A. Pinto, H. Pedrini, W. S. Schwartz, A. Rocha, A. Anjos, S. Marcel, "The 2nd competition on counter measures to 2D face spoofing attacks" in International Conference on Biometrics (ICB), Madrid (Spain), 2013, 1-6As a crucial security problem, anti-spoofing in biometrics, and particularly for the face modality, has achieved great progress in the recent years. Still, new threats arrive inform of better, more realistic and more sophisticated spoofing attacks. The objective of the 2nd Competition on Counter Measures to 2D Face Spoofing Attacks is to challenge researchers to create counter measures effectively detecting a variety of attacks. The submitted propositions are evaluated on the Replay-Attack database and the achieved results are presented in this paper.The authors would like to thank the Swiss Innovation Agency (CTI Project Replay) and the FP7 European TABULA RASA Project4 (257289) for their financial support
Performance of the CMS Cathode Strip Chambers with Cosmic Rays
The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device
in the CMS endcaps. Their performance has been evaluated using data taken
during a cosmic ray run in fall 2008. Measured noise levels are low, with the
number of noisy channels well below 1%. Coordinate resolution was measured for
all types of chambers, and fall in the range 47 microns to 243 microns. The
efficiencies for local charged track triggers, for hit and for segments
reconstruction were measured, and are above 99%. The timing resolution per
layer is approximately 5 ns
Performance and Operation of the CMS Electromagnetic Calorimeter
The operation and general performance of the CMS electromagnetic calorimeter
using cosmic-ray muons are described. These muons were recorded after the
closure of the CMS detector in late 2008. The calorimeter is made of lead
tungstate crystals and the overall status of the 75848 channels corresponding
to the barrel and endcap detectors is reported. The stability of crucial
operational parameters, such as high voltage, temperature and electronic noise,
is summarised and the performance of the light monitoring system is presented
Search for a pentaquark decaying to Cascade- pi-
We present a search for a pentaquark decaying strongly to in
collisions at a center-of-mass energy up to 25 GeV/c^2. Finding no
evidence for such a state in the mass range of 1480 MeV/c^2 to 2400 MeV/c^2, we
set limits on the yield and on the cross section times branching ratio relative
to .Comment: Accepted by Physics Letters
Test beam performance measurements for the Phase I upgrade of the CMS pixel detector
A new pixel detector for the CMS experiment was built in order to cope with the instantaneous luminosities anticipated for the Phase I Upgrade of the LHC. The new CMS pixel detector provides four-hit tracking with a reduced material budget as well as new cooling and powering schemes. A new front-end readout chip mitigates buffering and bandwidth limitations, and allows operation at low comparator thresholds. In this paper, comprehensive test beam studies are presented, which have been conducted to verify the design and to quantify the performance of the new detector assemblies in terms of tracking efficiency and spatial resolution. Under optimal conditions, the tracking efficiency is (99.95 ± 0.05) %, while the intrinsic spatial resolutions are (4.80 ± 0.25) μm and (7.99 ± 0.21) μm along the 100 μm and 150 μm pixel pitch, respectively. The findings are compared to a detailed Monte Carlo simulation of the pixel detector and good agreement is found.Peer reviewe
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