9,868 research outputs found
Gas inflows, star formation and metallicity evolution in galaxy pairs
It has been known since many decades that galaxy interactions can induce star
formation (hereafter SF) enhancements and that one of the driving mechanisms of
this enhancement is related to gas inflows into the central galaxy regions,
induced by asymmetries in the stellar component, like bars. In the last years
many evidences have been accumulating, showing that interacting pairs have
central gas-phase metallicities lower than those of field galaxies, by {\sim}
0.2-0.3 dex on average. These diluted ISM metallicities have been explained as
the result of inflows of metal-poor gas from the outer disk to the galaxy
central regions. A number of questions arises: What's the timing and the
duration of this dilution? How and when does the SF induced by the gas inflow
enrich the circumnuclear gas with re-processed material? Is there any
correlation between the timing and strength of the dilution and the timing and
intensity of the SF? By means of Tree-SPH simulations of galaxy major
interactions, we have studied the effect that gas inflows have on the ISM
dilution, and the effect that the induced SF has, subsequently, in re-enriching
the nuclear gas. In this contribution, we present the main results of this
study.Comment: Proceedings of the IAU Symposium 277 "Tracing the Ancestry of
Galaxies", 4 pages, 2 figure
How dark are dark figures? Official and self-report rates of inmate-on-inmate victimization
Inmate-on-inmate victimization rates were examined through official and self-report data. We checked prison records of 219 male inmates from a prison in Portugal, and estimated rates of official inmate-on- inmate victimization during a 12-month period. Of these 219 inmates, 108 agreed to participate in a self-report survey on their inmate-on- inmate victimization experiences in the last 12 months. According to official records 3.2% of the inmates were victimized, contrasting with the 78.5% prevalence rate revealed in self-report data. This high dark- figure highlights the need to implement specific strategies to prevent inmate-on-inmate victimization hence assuring the prison conditions necessary to corrections efficacy.This research was conducted at Psychology Research Centre [Centro de Investigação em Psicologia]
(UID/PSI/01662/2013), University of Minho, and supported by the Portuguese Foundation for
Science and Technology [Fundação para a Ciência e a Tecnologia] and the Portuguese Ministry
of Science, Technology and Higher Education [Ministério da Ciência, Tecnologia e Ensino
Superior] through national funds and co-financed by FEDER through COMPETE2020 under the
PT2020 Partnership Agreement (POCI-01-0145-FEDER-007653). The study was also supported by
Grant SFRH/BPD/108602/2015 from the Portuguese Foundation for Science and Technology
awarded to the second author
Exploring the health and wellbeing of lesbian, bisexual, queer and same sex attracted women living in the Illawarra and Shoalhaven regions
The Labrys Project is a partnership initiative between ACON and Women’s Health – Illawarra Shoalhaven Local Health District (ISLHD) carried out between 2014 and 2015. While lesbian, bisexual and queer (LBQ) women’s health research is increasing in Australia, epidemiological data around key issues affecting LBQ women’s health is inconsistent. The Labrys Project extended objectives from the Sydney Women and Sexual Health Survey (SWASH) to provide a snapshot of LBQ women’s health and wellbeing in the Illawarra and Shoalhaven regions of NSW, in order to provide a regional and rural perspective to LBQ women’s health and to inform local services and strategies. Between October 2014 and March 2015, 107 LBQ women completed the Illawarra Shoalhaven Women’s Health and Wellbeing Survey; in addition, two focus groups were held in Warilla and Nowra involving 7 LBQ women.ACON; Women’s Health – Illawarra Shoalhaven Local Health Distric
Growth performance, in vitro antioxidant properties and chemical composition of the halophyte Limonium algarvense Erben are strongly influenced by the irrigation salinity
Limonium algarvense Erben (sea lavender) is a halophyte species with potential to provide natural ingredients with in vitro antioxidant, anti-inflammatory, neuroprotective and antidiabetic properties. This study reports for the first time the 1) cultivation of sea lavender in greenhouse conditions under irrigation with freshwater (approx. 0 mM NaCl) and saline aquaculture wastewater (300 and 600 mM NaCl), and 2) the influence of the irrigation salinity on the plant performance (e.g growth, number of produced leaves and flowers), in vitro antioxidant properties [radical scavenging activity (DPPH and ABTS), ferric reducing antioxidant power (FRAP), metal chelating properties on copper (CCA) and iron (ICA)], toxicity (in vitro on three mammalian cell lines) and chemical composition (determined by LC-ESI-HRMS/MS). The freshwater-irrigated plants had better growth performance than those irrigated with saltwater. Extracts from wild plants, had the highest antioxidant activity, but those from cultivated ones kept high in vitro antioxidant properties and interesting chemical profile. The flowers' extracts of plants irrigated with 300 mM NaCl had the highest antioxidant activities against DPPH, whereas those from freshwater-irrigated plants were more active on ABTS, CCA and FRAP. Most of the extracts showed nil toxicity. The flowers' extracts displayed the highest diversity of compounds, mainly quercetin, apigenin, luteolin, naringenin and their glycoside derivatives. Moreover, their abundance varied with the irrigation salinity. These data indicate that sea lavender plants can be successfully cultivated in greenhouse conditions under fresh- and saltwater irrigation, maintaining interesting biological and chemical properties.Funding Agency
Portuguese Foundation for Science and Technology
Portuguese National Budget
CCMAR/Multi/04326/2019
GreenVet project
ALG-01-0145-FEDER-028876
XtrerneAquaCrops
FA-05-2017-028
Lisboa-01-0145-FEDER-022125-RNEM-IST
ID/QUI/00100/201
Portuguese Foundation for Science and Technology
SFRH/BD/116604/2016
CEECIND/00425/2017info:eu-repo/semantics/publishedVersio
Current-Induced Effects in Nanoscale Conductors
We present an overview of current-induced effects in nanoscale conductors
with emphasis on their description at the atomic level. In particular, we
discuss steady-state current fluctuations, current-induced forces, inelastic
scattering and local heating. All of these properties are calculated in terms
of single-particle wavefunctions computed using a scattering approach within
the static density-functional theory of many-electron systems. Examples of
current-induced effects in atomic and molecular wires will be given and
comparison with experimental results will be provided when available.Comment: revtex, 10 pages, 8 figure
Drinking water treatment by ultrafiltration: comparative evaluation through direct capital and operational costs with conventional and conventional with activated carbon systems
Neste trabalho é apresentada uma avaliação comparativa preliminar entre os sistemas de tratamento de água por ultrafiltração, convencional e convencional com carvão ativado, com base nos custos diretos de implantação e operação, utilizando-se os resultados obtidos em uma unidade piloto de ultrafiltração, instalada junto à captação de água no Reservatório Guarapiranga. Para comparação considerou-se os dados relativos à eficiência da remoção de Carbono Orgânico Total. A avaliação de custos foi feita pelo método de cálculo do perÃodo de retorno de investimento, obtendo-se valores de R 0,40/m³ para os outros sistemas. Estes resultados mostram o potencial de processos de separação por membranas no tratamento de água para abastecimento público.In this work it is presented a comparative evaluation for ultrafiltration, conventional, and conventional with activated carbon water treatment systems, considering direct capital and operational costs, based on the results of an ultrafiltration pilot unit, installed at the Guarapiranga’s Reservoir. In order to compare the costs it was considered Total Organic Carbon removal efficiency. Cost evaluation was performed based on the pay back method, resulting in a value of R 0.40/m3 for the others. These results clearly demonstrate the high potential of membrane separation technology for drinking water treatment
Quintessence and tachyon dark energy models with a constant equation of state parameter
In this work we determine the correspondence between quintessence and tachyon
dark energy models with a constant dark energy equation of state parameter,
. Although the evolution of both the Hubble parameter and the scalar field
potential with redshift is the same, we show that the evolution of
quintessence/tachyon scalar fields with redshift is, in general, very
different. We explicity demonstrate that if the potentials need
to be very fine-tuned for the relative perturbation on the equation of state
parameter, , to be very small around the present
time. We also discuss possible implications of our results for the
reconstruction of the evolution of with redshift using varying couplings.Comment: 9 pages, 2 figures, published version with two extra references
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Desenvolvimento e seleção de modelos de alerta para a ferrugem do cafeeiro em anos de alta carga pendente de frutos.
RESUMO: Este trabalho teve como objetivo desenvolver e selecionar modelos de alerta para predizer o aumento da taxa de progresso mensal da ferrugem do cafeeiro para lavouras em anos de alta carga pendente de frutos. Os modelos foram desenvolvidos por meio de quatro técnicas de mineração de dados: redes neurais artificiais, árvores de decisão, máquinas de vetores suporte e florestas aleatórias. A seleção dos modelos ocorreu de forma gráfica e por meio de suas medidas de desempenho e o resultado mostrou que os modelos desenvolvidos neste trabalho apresentaram desempenho superior a outros previamente desenvolvidos. Estes modelos de alerta fornecem melhores subsÃdios para o monitoramento da doença da ferrugem do cafeeiro em anos de alta carga pendente de frutos
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