The GREATS Hβ\beta+[OIII] Luminosity Function and Galaxy Properties at z∼8\mathbf{z\sim8}: Walking the Way of JWST

The James Webb Space Telescope will allow to spectroscopically study an unprecedented number of galaxies deep into the reionization era, notably by detecting [OIII] and H$\beta$ nebular emission lines. To efficiently prepare such observations, we photometrically select a large sample of galaxies at $z\sim8$ and study their rest-frame optical emission lines. Combining data from the GOODS Re-ionization Era wide-Area Treasury from Spitzer (GREATS) survey and from HST, we perform spectral energy distribution (SED) fitting, using synthetic SEDs from a large grid of photoionization models. The deep Spitzer/IRAC data combined with our models exploring a large parameter space enables to constrain the [OIII]+H$\beta$ fluxes and equivalent widths for our sample, as well as the average physical properties of $z\sim8$ galaxies, such as the ionizing photon production efficiency with $\log(\xi_\mathrm{ion}/\mathrm{erg}^{-1}\hspace{1mm}\mathrm{Hz})\geq25.77$. We find a relatively tight correlation between the [OIII]+H$\beta$ and UV luminosity, which we use to derive for the first time the [OIII]+H$\beta$ luminosity function (LF) at $z\sim8$. The $z\sim8$ [OIII]+H$\beta$ LF is higher at all luminosities compared to lower redshift, as opposed to the UV LF, due to an increase of the [OIII]+H$\beta$ luminosity at a given UV luminosity from $z\sim3$ to $z\sim8$. Finally, using the [OIII]+H$\beta$ LF, we make predictions for JWST/NIRSpec number counts of $z\sim8$ galaxies. We find that the current wide-area extragalactic legacy fields are too shallow to use JWST at maximal efficiency for $z\sim8$ spectroscopy even at 1hr depth and JWST pre-imaging to $\gtrsim30$ mag will be required.Comment: 13 pages, 9 figures, accepted for publication in MNRA

Typological characterization of the Portuguese traditional schist constructions

Schist constructions represent an important cultural, architectural and historical legacy in Europe, and particularly in Portugal, that urges to preserve. Included among the traditional Portuguese architectural heritage, there are many traditional buildings in schist masonry, distributed from North to South, varying the types of buildings, the constructive methodologies and even the material schist, which may vary in properties and characteristics, depending on the region where it is extracted. Over the years, this traditional architecture has implemented a sustainable construction through the use of natural materials available in the region, as today it is desired to implement in the contemporary construction practice. The constructive techniques and solutions of these traditional structures have been developed in direct relation with various factors as economic, environmental and social, adapting to different requirements over the time, originating a wide diversity of construction typologies that today exist in Portugal. The present study intends to describe and characterize the different building typologies of the traditional schist construction in Portugal mainland. Examples of more prominent constructions, considering its dimensions and/or patrimonial importance are presented and analyzed

Summary for policymakers

This Summary for Policymakers presents key findings from the Special Report on Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation (SREX). The SREX approaches the topic by assessing the scientific literature on issues that range from the relationship between climate change and extreme weather and climate events ("climate extremes") to the implications of these events for society and sustainable development. The assessment concerns the interaction of climatic, environmental, and human factors that can lead to impacts and disasters, options for managing the risks posed by impacts and disasters, and the important role that non-climatic factors play in determining impacts. The character and severity of impacts from climate extremes depend not only on the extremes themselves but also on exposure and vulnerability. In this report, adverse impacts are considered disasters when they produce widespread damage and cause severe alterations in the normal functioning of communities or societies. Climate extremes, exposure, and vulnerability are influenced by a wide range of factors, including anthropogenic climate change, natural climate variability, and socioeconomic development. Disaster risk management and adaptation to climate change focus on reducing exposure and vulnerability and increasing resilience to the potential adverse impacts of climate extremes, even though risks cannot fully be eliminated. Although mitigation of climate change is not the focus of this report, adaptation and mitigation can complement each other and together can significantly reduce the risks of climate change. This report integrates perspectives from several historically distinct research communities studying climate science, climate impacts, adaptation to climate change, and disaster risk management. Each community brings different viewpoints, vocabularies, approaches, and goals, and all provide important insights into the status of the knowledge base and its gaps. Many of the key assessment findings come from the interfaces among these communities

Depression and anxiety consequences of the COVID-19 pandemic: A longitudinal cohort study with university students

Introduction. For young people, just as in the general population, COVID-19 caused many changes in their lives. The literature review has shown an increased risk for mental illness symptoms as a consequence of the pandemic. Objectives. With this study, we aimed to evaluate the impact of COVID-19 pandemic in university students’ anxiety and depression symptoms. Methods. This study is part of a larger longitudinal research on university students’ mental health with the Portuguese version of The Patient Health Questionnaire (PHQ-9) and the Portuguese version of the Generalised Anxiety Disorder (GAD-7) data with evaluations on January, May and October 2019 and June 2020, as well as socio-demographic information. Results. 341 university students (257 females and 84 males) were included in this study, with a mean age of 19.91 (SD=1.58). In June 2020, the mean for perceived well-being loss was 60.47% (SD=26.56) and 59.54% (SD=28.95) for mental health loss. In the PHQ-9, the proportion of students with scores equal or above 15 ranged between 22.6% and 25.5% in 2019, however, in June 2020, the proportion was significantly higher (37.0%). The proportion of GAD-7 scores above the cut-off 10 ranged between 46.0% and 47.8% in 2019, and, in 2020, 64.5% of the students scored 10 or above. Compared with preceding trends, PHQ-9 scores were 3.11 (CI=2.40-3.83) higher than expected, and GAD-7 scores were 3.56 (CI=2.75-5.37) higher. Conclusions. COVID-19 had a negative impact on depressive and anxiety symptoms in university students, in line with the literature and confirming the vulnerability of young people in such uncertain times

Gaussian superpositions in scalar-tensor quantum cosmological models

A free scalar field minimally coupled to gravity model is quantized and the Wheeler-DeWitt equation in minisuperspace is solved analytically, exhibiting positive and negative frequency modes. The analysis is performed for positive, negative and zero values of the curvature of the spatial section. Gaussian superpositions of the modes are constructed, and the quantum bohmian trajectories are determined in the framework of the Bohm-de Broglie interpretation of quantum cosmology. Oscillating universes appear in all cases, but with a characteristic scale of the order of the Planck scale. Bouncing regular solutions emerge for the flat curvature case. They contract classically from infinity until a minimum size, where quantum effects become important acting as repulsive forces avoiding the singularity and creating an inflationary phase, expanding afterwards to an infinite size, approaching the classical expansion as long as the scale factor increases. These are non-singular solutions which are viable models to describe the early Universe.Comment: 14 pages, LaTeX, 3 Postscript figures, uses graficx.st

Tagetes minuta - uma nova alternativa no controle fitoterápico de carrapatos.

Obrigatoriamente os carrapatos são parasitas hematófagos (FREIRE, 1972) da maioria dos animais vertebrados, podendo transmitir uma variedade de agentes patogênicos (ESTRADA-PENA; JONGEJAN, 1999). Depois dos mosquitos os carrapatos são considerados o primeiro grupo de artrópodes ectoparasitos a transmitirem agentes patogênicos aos seres humanos, e ocupam o primeiro lugar na transmissão de agentes causadores de doenças aos animais (JONGEJAN; UILENBERG, 2004; OGRZEWALSKA, 2009). Pertencem ao filo Arthropoda, classe Arachnida, ordem Acari e subordem Ixodida e apresentam uma ampla distribuição geográfica.bitstream/item/109847/1/DOC207.pd

Método de determinação de cálcio iônico no leite bovino.

bitstream/item/44002/1/documento-321.pd

Seleção precoce de clones de cajueiro anão para o cultivo irrigado.

bitstream/CNPAT-2010/11955/1/Ct-046.pd