TIPOLOGIA DE BACIAS DE DRENAGEM NO LITORAL SUL DO RIO DE JANEIRO

Bacias de drenagem são importantes recortes espaciais do relevo e fundamentais na compreensão da dinâmica evolutiva da paisagem. Em áreas onde há evidências de controles tectônicos no relevo, a análise da configuração e dinâmica da rede de drenagem representa importante ferramenta de pesquisa. O presente trabalho busca o estabelecimento de tipologias de bacias baseado em critérios morfológicos, morfométricos e estruturais visando identificar padrões de comportamentos diferenciados

ENSINO DE GEOMORFOLOGIA A DISTÂNCIA: ESTRATÉGIAS ADOTADAS NA LICENCIATURA EM GEOGRAFIA DO CEDERJ/UERJ

O ensino a distância (EAD) vem se consolidando como modo de ampliar o acesso à formação profissional no Brasil. A organização da disciplina Geomorfologia Geral para a Licenciatura EAD em Geografia do consórcio CEDERJ/UERJ partiu de pressupostos que reconheciam as limitações e possibilidades desta modalidade acadêmica. Serão aqui apresentadas estratégias usadas na produção de material didático consideradas bem sucedidas pela equipe profissional e pelos discentes ao longo de 2013 e 2014

Conformational study and reassessment of the vibrational assignments for Norspermidine

The present study presents and discusses the conformational preferences of Norspermidine (NSpd). The effects of varying the dielectric constant on the conformational preferences are discussed, with a view to infer which conformation will correspond to the most stable in the pure condensed liquid phase. Within the same context, a set of NSpd-NH3 molecular adducts were simulated in order to determine the relevance of intermolecular hydrogen bonding on the overall stability and relative positioning of the respective vibrational frequencies. The calculations presently performed allowed a reassessment of the vibrational assignments for NSpd. A full assignment of the NSpd vibrational spectra is presented, with special emphasis being given to the vibrational modes that proved to be most affected by hydrogen bonding. The various inconsistencies of a prior study found in the literature were identified and rectified

Life cycle assessment of a renewable energy generation system with a vanadium redox flow battery in a NZEB household

6th International Conference on Energy and Environment ResearchBuildings are responsible for a significant part of the global energy consumption. Besides the need to improve their energy efficiency, new buildings also need to generate their own energy, preferably from renewable sources, to become more sustainable. As renewable energy generation is strongly dependent on the climatic conditions, energy storage must be considered when designing such a system. In this study, a cradle-to-grave life cycle assessment (LCA) study of a renewable energy generation system with a prototype Vanadium flow battery integrated in a Near Zero Energy Building (NZEB) is performed. A combined grid-connected PV and a solar thermal system generates the energy, and it was dimensioned to supply the annual energy needs of a household in Porto, Portugal considering the local climatic conditions. As an end of life scenario, it is assumed that the battery is dismantled and most of the materials are recycled. A functional unit of 1 kWh of supplied energy to the system was considered, and study results show that environmental impacts are reduced when the energy is produced onsite and the battery components are recycled or reused. A sensitivity analysis was conducted changing the household’s geographic location.Authors thank the financial support of projects “SunStorage - Harvesting and storage of solar energy”, with reference POCI-01-0145-FEDER-016387, funded by European Regional Development Fund (ERDF), through COMPETE 2020 - Operational Programme for Competitiveness and Internationalization (OPCI), and to FCT - Fundação para a Ciência e a Tecnologia I.P., for funding project IF/01093/2014/CP1249/CT0003, research grants IF/01093/2014 and SFRH/BPD/112003/2015, and financial support of POCI-01-0145-FEDER-006939 (Laboratory for Process Engineering, Environment, Biotechnology and Energy - LEPABE, UID/EQU/00511/2019) funded by FEDER through COMPETE2020-POCI and by national funds through FCT/MCTES (PIDDAC). Authors would also like to thank Dr. Ricardo André Ribeiro Monteiro for the valuable information regarding the vanadium battery prototype obtained within the Sunstorage project.info:eu-repo/semantics/publishedVersio

Precipitation reaction in alpha-Cu-Al-Ag alloys

The Ag-rich precipitates formation reaction in the Cu-9.22%at. Al-4.66%at. Ag, Cu-9.31%at. Al-5.83%at. Ag and Cu-9.37%at. Al-7.08%at. Ag alloys was studied using microhardness change measurements with temperature and time, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results indicated that the Ag-rich phase formation is an interface controlled process with a zero-order mechanism, due to the amount of unsolved Ag that makes the precipitation reaction rate independent of Ag concentration.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNIFESP Departamento de Ciências Exatas e da TerraUNESP Instituto de Química Departamento de Físico-QuímicaUNIFESP, Depto. de Ciências Exatas e da TerraSciEL

Adaptive diffusion schemes for heterogeneous networks

In this paper, we deal with distributed estimation problems in diffusion networks with heterogeneous nodes, i.e., nodes that either implement different adaptive rules or differ in some other aspect such as the filter structure or length, or step size. Although such heterogeneous networks have been considered from the first works on diffusion networks, obtaining practical and robust schemes to adaptively adjust the combiners in different scenarios is still an open problem. In this paper, we study a diffusion strategy specially designed and suited to heterogeneous networks. Our approach is based on two key ingredients: 1) the adaptation and combination phases are completely decoupled, so that network nodes keep purely local estimations at all times and 2) combiners are adapted to minimize estimates of the network mean-square-error. Our scheme is compared with the standard adapt-Then-combine scheme and theoretically analyzed using energy conservation arguments. Several experiments involving networks with heterogeneous nodes show that the proposed decoupled adapt-Then-combine approach with adaptive combiners outperforms other state-of-The-Art techniques, becoming a competitive approach in these scenarios

ESTILOS FLUVIAIS NAS BACIAS HIDROGRÁFICAS DA VILA DOIS RIOS, ILHA GRANDE (RJ)

Em duas bacias hidrográficas localizadas na Ilha Grande/RJ foram realizados estudos sobre a dinâmica fluvial a partir da investigação de características ambientais e da interferência antrópica com objetivo de identificar os Estilos Fluviais. Foram realizadas pesquisas de campo, consultas a trabalhos análogos e mapeamento utilizando imagens de satélite. Seguindo a metodologia River Styles®, foram identificados três tipos de estilos fluviais: florestados, rochosos e meândricos com sedimento fino

Study on Awareness on the Mercury Usage in Sri Lankan Small Scale Jewellery Sector

Mercury is utilised in extensive amounts for gold recovery from the waste produced during the traditional gold jewellery manufacturing particularly in the Small Scale Jewellery Sector (SSJS). Due to its toxicity and bioaccumulation potential this can cause for serious health effects and environmental pollution. Colombo and Gampaha districts are the main two districts where SSJS is mostly confined. Therefore, this study was focused to assess the amount of mercury usage in SSJS through a structured interview and a questionnaire survey among 120 goldsmiths from these districts. It was revealed that, gold is recovered once in a six month period or annually by using significant amounts of mercury which is totally depends on the workload and amount of waste collected.In this process, the waste is mixed with mercury to form Hg-Au amalgam and it is roasted to recover gold while mercury gets removed through vitalisation. It was disclosed that, about 4 g of mercury is used to refine one pound of gold (8 g). None of the respondents practice any safety precautions or proper ventilation techniques during this process. Therefore they get readily exposed to mercury vapor. Among the interviewees, only 10% of manufacturers were aware about the toxicity of mercury and do not use mercury in gold refining process while 20% of the individuals were not aware about the harmful effects of mercury. However, 70% of the respondents were aware about the toxic effects of mercury but use extensively as a rapid way off extracting gold from waste. 90% of the inspected workshops had very poor ventilation facilities thus increase the susceptibility of exposure to mercury vapor. 24% of the respondents store mercury in unsafe plastic bags which can easily get damaged and released into the environment. Approximately 25% of the respondents revealed that they had some health issues after they engaged in gold refining. Therefore biomonitoring assessment is recommended for a better understanding of mercury exposure levels of the people engaged in gold refining in SSJS.Keywords: Gold refining, Mercury, Small scale jewellery secto

Carcass characteristics and meat quality of sheep fed buffelgrass silage to replace corn silage

The aim of the study was to evaluate the carcass characteristics, proximate composition, and sensorial attributes of meat from sheep fed diets in which buffelgrass silage replaced corn silage. Thirty-two intact male crossbred Santa Inês sheep with an average live weight of 20.09 ± 2.0 kg were housed in individual stalls and allotted at random to four treatments in which corn silage was replaced by buffelgrass silage at the levels of 0 (control), 33.3%, 66.6%, and 100%. After an adaption period of 10 days, the sheep were fed for an additional 61 days. Feed was offered ad libitum and corn silage comprised 60% of the diet for the control group. Carcass characteristics, non-carcass components and meat quality were evaluated. Hot carcass yield, cold carcass yield, true carcass yield, trimmings, fat weight, and mesenteric and omental fat weight were highest for the control group (P <0.05). Loin eye area had a quadratic response (P =0.02), with the largest areas being observed in animals fed the diet containing 66.6% buffelgrass silage. Liver weight (P <0.01), luminosity of the meat (P <0.05), and cooking loss (P <0.05) likewise had nonlinear responses to the concentration of buffelgrass silage in the diet. The treatments did not have significant negative influence on the nutritional and organoleptic characteristics of the meat