172 research outputs found

    FarNet-II: An improved solar far-side active region detection method

    Full text link
    Context. Activity on the far side of the Sun is routinely studied through the analysis of the seismic oscillations detected on the near side using helioseismic techniques such as phase shift sensitive holography. Recently, the neural network FarNet was developed to improve these detections. Aims. We aim to create a new machine learning tool, FarNet II, which further increases the scope of FarNet, and to evaluate its performance in comparison to FarNet and the standard helioseismic method for detecting far side activity. Methods. We developed FarNet II, a neural network that retains some of the general characteristics of FarNet but improves the detections in general, as well as the temporal coherence among successive predictions. The main novelties are the implementation of attention and convolutional long short term memory (ConvLSTM) modules. A cross validation approach, training the network 37 times with a different validation set for each run, was employed to leverage the limited amount of data available. We evaluate the performance of FarNet II using three years of extreme ultraviolet observations of the far side of the Sun acquired with the Solar Terrestrial Relations Observatory (STEREO) as a proxy of activity. The results from FarNet II were compared with those obtained from FarNet and the standard helioseismic method using the Dice coefficient as a metric. Results. FarNet II achieves a Dice coefficient that improves that of FarNet by over 0.2 points for every output position on the sequences from the evaluation dates. Its improvement over FarNet is higher than that of FarNet over the standard method. Conclusions. The new network is a very promising tool for improving the detection of activity on the far side of the Sun given by pure helioseismic techniques. Space weather forecasts can potentially benefit from the higher sensitivity provided by this novel method.Comment: Accepted for publication in Astronomy and Astrophysics. Abridged abstrac

    Integrated planetary outpost simulation to assess crew psychophysiological response as a first approach to a Lunar/Mars Manned base settlement

    Get PDF
    One of the most effective and complex concepts in planetary settlement is the integration of interfaces such as habitat modules, rover vehicles and space suits that can connect via airlocks, suitports and tunnels, and can disconnect to operate independently. This scenario is ideal to assess common symptoms during spaceflight missions such as fatigue, sleep loss, circadian desynchronization and work overload, This paper describes the main features of an integrated system built at the Human Spaceflight Laboratory from the Department of Space Studies at the University of North Dakota and a series of feasible measurements that can be conducted there to assess psychophysiological responses of a crew during confinement. This approach may contribute in the analysis of environmental mission conditions that interfere with sleep quality and individual vulnerabilities associated to sleep loss and circadian desynchronization.Fil: Van Broock, Lynn. Pontificia Universidad Católica Argentina "Santa María de los Buenos Aires". Instituto de Investigaciones Biomédicas. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Biomédicas; ArgentinaFil: de León, Pablo. University North Dakota; Estados UnidosFil: Vigo, Daniel Eduardo. Pontificia Universidad Católica Argentina "Santa María de los Buenos Aires". Instituto de Investigaciones Biomédicas. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Biomédicas; Argentin

    Estudo da qualidade da água em dois reservatórios de PCHs em cascata: efeitos cumulativos e eficiência de índices de qualidade ambiental

    Get PDF
    TCC(graduação) - Universidade Federal de Santa Catarina. Centro Tecnológico. Engenharia Sanitária e Ambiental.A geração de energia hidrelétrica possui grande relevância nacional e internacional, uma vez que coloca o país na segunda posição dentre as nações com a maior capacidade instalada. Este tipo de empreendimento consiste na construção de reservatórios, os quais podem trazer benefícios sociais e econômicos por meio dos seus usos múltiplos, porém também são amplamente estudados os diversos impactos ambientais negativos observados durante as fases de instalação e operação, sendo a alteração da qualidade da água, um dos principais fatores adversos. Em rios que possuem reservatórios em cascata, a alteração da qualidade da água pode ainda sofrer efeitos cumulativos. Este estudo, objetivou avaliar os possíveis efeitos adversos sobre a qualidade da água em dois empreendimentos hidrelétricos em cascata e analisar a efetividade do uso de índices compostos (IQA, IET, IQAR) para o estudo ambiental dos reservatórios entre 2013 e 2020. Os dados foram analisados conforme limites presentes na Resolução CONAMA 357/2005, de acordo com o enquadramento do corpo d’água e quanto às classificações presentes nas metodologias utilizadas (IQA, IET, IQAR). Foram aplicados testes estatísticos que permitiram a verificação da existência de efeitos cumulativos e correlações entre os dados analisados, para posterior elaboração de hipóteses quanto ao comportamento dos parâmetros analisados neste estudo. Verificou-se de forma recorrente, o não atendimento às faixas de valores previstas para o enquadramento do corpo hídrico como Classe 2, principalmente para os parâmetros Fósforo Total (61,1% para o ponto P4-Fundo PCH II), Demanda Bioquímica de Oxigênio (41,7% para o ponto P4-Fundo PCH II) e Oxigênio Dissolvido (19,3% para o ponto P2-Fundo na PCH I). Devido aos altos valores citados, foi registrado em certos momentos baixa qualidade da água por meio dos índices ambientais, alcançando valores de qualidade d’água Ruim (IQA), estado de mesotrofia do corpo d’água (IET) e ambiente criticamente degradado (IQAR). A eficiência dos índices de qualidade ambiental apresentou variabilidade entre ambas as localidades, não havendo inicialmente uma correlação entre os resultados obtidos. Portanto, se faz imperativo o uso complementar de parâmetros referentes à qualidade da água e ao uso desejado para o corpo hídrico em estudo, uma vez que as metodologias existentes muitas vezes analisam de forma exageradamente simplificada estas informações. Por meio dos testes de T Pareado e Wilcoxon, não foram encontradas evidências que comprovem a existência de efeitos cumulativos na qualidade da água causada pelo layout em cascata.The generation of hydroelectric energy has great national and international relevance, as it places the country in the second position among the nations with the largest installed capacity. This type of project consists of the construction of reservoirs, which can bring social and economic benefits through their multiple uses, but the various negative environmental impacts observed during the installation and operation phases are also widely studied, with the change in the quality of the water, being one of the main adverse factors. In rivers that have cascading reservoirs, the change in water quality can still suffer cumulative effects. This study aimed to evaluate the possible adverse effects on water quality in two hydroelectric projects in cascade and analyze the effectiveness of the usage of composite indices (IQA, IET, IQAR) for the environmental study of reservoirs between 2013 and 2020. The data were analyzed according to the limits present in CONAMA Resolution 357/2005, according to the framework of the water body and regarding the classifications present in the methodologies used (IQA, IET, IQAR). Statistical tests were applied to verify the existence of cumulative effects and correlations between the data analyzed, for further elaboration of hypotheses regarding the behavior of the parameters analyzed in this study. It was verified recurrently, the non-compliance with the ranges of values foreseen for the classification of the water body as Class 2, mainly for the parameters Total Phosphorus (61.1% for the point P4-Fund SHP II), Biochemical Oxygen Demand (41.7% for P4-Bottom SHP II) and Dissolved Oxygen (19.3% for P2-Bottom of SHP I). Due to the high values mentioned, low water quality was recorded at certain times through environmental indices, reaching values of Poor water quality (IQA), mesotrophy status of the water body (IET) and critically degraded environment (IQAR). The efficiency of the environmental quality indices showed variability between both locations, initially not having a correlation between the results obtained. Therefore, the complementary use of parameters related to water quality and the desired use for the water body under study is imperative since the existing methodologies often analyze this information in an exaggeratedly simplified way. Through the Paired T and Wilcoxon tests, no evidence was found to prove the existence of cumulative effects on water quality caused by the cascade layout

    Internacionalização das industrias brasileiras

    Get PDF
    Orientador: Pedro SteinerMonografia (Especialização) - Universidade Federal do Paraná, Setor de Ciências Sociais Aplicadas, Curso de Especialização em Estratégia e Gestão Empresaria

    Insekten schützen!

    Get PDF
    INSEKTEN SCHÜTZEN! Insekten schützen! / Broock, Antje von (Rights reserved) ( -

    European Green Deal - Mehr Fassadenbegrünung als Aufbruch in eine neue Zeit

    Get PDF
    EUROPEAN GREEN DEAL - MEHR FASSADENBEGRÜNUNG ALS AUFBRUCH IN EINE NEUE ZEIT European Green Deal - Mehr Fassadenbegrünung als Aufbruch in eine neue Zeit / Broock, Antje von (Rights reserved) ( -

    Atommüll ohne Ende

    Get PDF
    ATOMMÜLL OHNE ENDE Atommüll ohne Ende / Broock, Antje von (Rights reserved) ( -

    Habitantes microscópicos de los glaciares: Levaduras

    Get PDF
    Las levaduras son hongos unicelulares microscópicos, es decir se encuentran compuestos por una sola célula, a diferencia de otros hongos que pueden observarse a simple vista. Las levaduras forman parte de la biodiversidad de los ambientes naturales y se encuentran distribuidas en todo el mundo, incluso en los ambientes considerados extremos (fríos, ácidos, con altas radiaciones solares o altas concentraciones de sal, etc.). Cumplen diferentes roles en la naturaleza; son capaces de transformar los nutrientes y dejarlos disponibles para otros organismos, colaborando así en el reciclado de restos vegetales y animales, y pueden tener diferentes relaciones con estos. Estas relaciones van desde competencia, parasitismo o patogenicidad (algunas levaduras pueden producir enfermedades), a presentar relaciones beneficiosas, tanto para la levadura, como para el otro organismo involucrado (relación mutualista). Entre estas últimas, la más estudiada es la relación con insectos (moscas, abejas, etc.)
    corecore