1,834 research outputs found

    Organização das sequĂȘncias ofensivas que terminaram com remate no futsal nacional de alto rendimento : estudo realizado com as equipas da I DivisĂŁo Nacional de Futsal na Ă©poca de 2009-2010

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    O estudo teve por objetivo analisar a influĂȘncia das variĂĄveis contextuais (local do jogo, qualidade do adversĂĄrio, resultado corrente e perĂ­odo de jogo) e de performance na organização das sequĂȘncias ofensivas que terminaram com remate no futsal de alto rendimento. A amostra foi constituĂ­da por 906 sequĂȘncias ofensivas que terminaram com remate. As sequĂȘncias foram registadas em 20 jogos disputados por uma equipa na fase regular da 1ÂȘ DivisĂŁo Nacional do Campeonato PortuguĂȘs de Futsal, na Ă©poca de 2009/2010. Para o registo das variĂĄveis de performance e de contexto foi desenvolvido um sistema de observação que incluiu onze variĂĄveis de performance e quatro variĂĄveis contextuais. Para a observação e anotação dos dados foi utilizado o Software LongoMatch 16.0. Os dados foram analisados com recurso Ă  estatĂ­stica descritiva e ao teste do Qui-quadrado. Os resultados confirmaram uma associação positiva significativa entre trĂȘs variĂĄveis de performance (situação de jogo, zona da recuperação da posse de bola e zona de finalização) e o ĂȘxito das equipas nas sequĂȘncias ofensivas que terminaram com remate. A qualidade do adversĂĄrio e o resultado corrente demonstraram uma relação significativa com o ĂȘxito da sequĂȘncia ofensiva. Jogando contra os adversĂĄrios mais fracos, as equipas conseguiram criar significativamente maior nĂșmero de situaçÔes de finalização e marcaram mais golos. Em situação de vantagem no marcador foi verificado um aumento do nĂșmero de sequĂȘncias ofensivas que terminam com remate. Na 2ÂȘ parte do jogo as equipas realizaram maior nĂșmero de sequĂȘncias ofensivas que terminaram com golo. As equipas anfitriĂŁs organizaram mais sequĂȘncias ofensivas que terminam em golo.The aim of the present study was to analyze the influence of the contextual variables (quality of opposition, game location, match status and game period) and performance indicators on the organization of offensive sequences,, which finished with a shot on goal in futsal. The sample consisted of 906 offensive sequences that ended with a shot on goal. The sequences were registered in 20 matches of the First National Division of Futsal Portuguese Championship played in 2009/10 regular season. An observational system was developed to record the performance variables during the games. This system included eleven performance indicators and four contextual variables. Data were collected using LongoMatch 16, and analyzed using descriptive statistical methods, t and Chi-square test. The results confirmed a positive association between three performance indicators (game situation, ball-possession recovery sector and sector where transition was finished) and the teams’ success in offensive sequences ended in a shot on goal. The quality of opposition and match status had a significant influence on the success of offensive sequences. The teams were able to score more goals playing against weaker opponents teams. The number of offensive sequences ended in a shot on goal increased, when teams played with the score advantage. In the 2nd part of the match the number of offensive sequences ended in a goal increased. Home teams organized more offensive sequences, which ended in a goal

    Point of Zero Charge determination of ten standard biochars for the removal of methylene blue from aqueous solutions

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    This study describes the determination of the point of zero charge (PZC) of ten standard biochars (BC), supplied by the UK Biochar Research Centre (UKBRC), using the salt addition method, in order to select suitable biochar(s) for methylene blue removal from aqueous solutions. The initial pH (pHi) was adjusted in a range of 3 to 13 using NaOH and HNO3 solutions. The experiments employed a biochar dose of 10 g L-1. The final pH values (pHf) were recorded in the remaining suspensions after a 24-hour contact time at 120 rpm. The difference between pHi and pHf (∆pH) was plotted against pHi values and the pH at PZC (pHPZC) corresponded to the point of intersection in the resulting curve. The results obtained in 0.1 mol L-1 NaNO3 were the following: PZC at 7.24 and 8.53 for rice husk biochar (RH), the first obtained at 550 °C pyrolytic temperature and the latter at 700 °C (RH550 and RH700); PZC at 8.81 and 9.46 for oil seed rape straw pellets biochar obtained at 550 °C and 700 °C (OSR550 and OSR700), respectively; PZC at 9.24 and 9.84 for wheat straw pellets biochar (WS550 and WS700, respectively); PZC at 8.98 and 8.94 for Miscanthus straw pellets biochar (MSP550 and MSP700, respectively); and PZC at 6.73 and 7.15 for soft wood pellets biochar (SWP550 and SWP700, respectively). Please click Additional Files below to see the full abstract

    Variabilidade em escala da energia cinética turbulenta acima de floresta na amazÎnia ocidental

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    A Transformada em Ondeletas (TO), ondeleta complexa de Morlet, Ă© aplicada ao estudo dos padrĂ”es de variabilidade por escala da energia cinĂ©tica turbulenta (ECT). Para isto sĂŁo usados dados amostrados a 16,0Hz dos dias julianos de 083 (23 de março) atĂ© 098 (3 de abril) coletados na estação Ășmida de 1999 e dados amostrados a 10,4Hz a partir do dia 284 (12 de outubro) atĂ© 300 (29 de outubro) coletados durante a estação de transição seca para Ășmida de 2002, medidos no topo da torre de 60 m, construĂ­da na Reserva BiolĂłgica do JarĂș (Rebio-JarĂș), RondĂŽnia. Foram analisados dados medidos em quatro perĂ­odos (manhĂŁ, tarde, noite e madrugada). Os resultados mostram diferenças importantes entre os perĂ­odos estudados

    Flood risk map from hydrological and mobility data: a case study in S\~ao Paulo (Brazil)

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    Cities increasingly face flood risk primarily due to extensive changes of the natural land cover to built-up areas with impervious surfaces. In urban areas, flood impacts come mainly from road interruption. This paper proposes an urban flood risk map from hydrological and mobility data, considering the megacity of S\~ao Paulo, Brazil, as a case study. We estimate the flood susceptibility through the Height Above the Nearest Drainage algorithm; and the potential impact through the exposure and vulnerability components. We aggregate all variables into a regular grid and then classify the cells of each component into three classes: Moderate, High, and Very High. All components, except the flood susceptibility, have few cells in the Very High class. The flood susceptibility component reflects the presence of watercourses, and it has a strong influence on the location of those cells classified as Very High.Comment: 22 pages, 20 figure

    Densidade de semeadura e nitrogĂȘnio no trigo BRS 404 em sistema sequeiro em Planaltina - DF / Seeding density and nitrogen in wheat BRS 404 in a rainfed system in Planaltina – DF

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    O cultivo do trigo sequeiro na regiĂŁo do Cerrado do Brasil Central tem crescido nos Ășltimos anos e vem contribuindo para diversificar os sistemas produtivos na regiĂŁo. Objetivou-se avaliar diferentes densidades de semeadura e a aplicação em cobertura de diferentes doses de nitrogĂȘnio na cultivar de trigo BRS 404 cultivada no sistema de sequeiro, sem irrigação, no perĂ­odo da safrinha. O delineamento experimental utilizado foi de blocos ao acaso, com parcelas subdivididas e quatro repetiçÔes. A parcela foi constituĂ­da por quatro densidades de semeadura (150, 250, 350 e 450 sementes m-2) e na subparcela cinco doses de nitrogĂȘnio (0, 30, 60, 90 e 120 kg ha-1) aplicadas em cobertura durante a fase do perfilhamento. ApĂłs a emergĂȘncia foi realizada a contagem de plantas e determinando o estande inicial. Antes da colheita foi realizada a contagem de espigas e apĂłs a colheita tambĂ©m foram determinados o rendimento de grĂŁos, o peso hectolĂ­trico e o peso de mil grĂŁos. O rendimento de grĂŁos mĂĄximo da BRS 404 foi obtido com 196 sementes m-2 e 37 kg de N ha-1. O peso hectolĂ­trico e o peso de mil grĂŁos diminuĂ­ram com o aumento da densidade e do nitrogĂȘnio em cobertura

    High RAC3 expression levels are required for induction and maintaining of cancer cell stemness

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    RAC3 is a transcription coactivator, usually overexpressed in several tumors and required to maintain the pluripotency in normal stem cells. In this work we studied the association between RAC3 overexpression on cancer cell stemness and the capacity of this protein to induce cancer stem properties in non tumoral cells. We performed in vitro and in vivo experiments using two strategies: by overexpressing RAC3 in the non tumoral cell line HEK293 and by silencing RAC3 in the human colorectal epithelial cell line HCT116 by transfection. Furthermore, we analysed public repository microarrays data from human colorectal tumors in different developmental stages. We found that RAC3 overexpression was mainly associated to CD133+ sidepopulation of colon cancer cells and also to early and advanced stages of colon cancer, involving increased expression of mesenchymal and stem markers. In turn, RAC3 silencing induced diminished tumoral properties and cancer stem cells as determined by Hoechst efflux, tumorspheres and clonogenic growth, which correlated with decreased Nanog and OCT4 expression. In non tumoral cells, RAC3 overexpression induced tumoral transformation; mesenchymal phenotype and stem markers expression. Moreover, these transformed cells generated tumors in vivo. Our results demonstrate that RAC3 is required for maintaining and induction of cancer cell stemness.Fil: Panelo, Laura Carolina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones MĂ©dicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones MĂ©dicas; ArgentinaFil: Soares Machado, Mileni. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones MĂ©dicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones MĂ©dicas; ArgentinaFil: Rubio, Maria Fernanda. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones MĂ©dicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones MĂ©dicas; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Ciudad Universitaria. Instituto de QuĂ­mica BiolĂłgica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de QuĂ­mica BiolĂłgica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Jaworski, Felipe MartĂ­n. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Ciudad Universitaria. Instituto de QuĂ­mica BiolĂłgica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de QuĂ­mica BiolĂłgica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Alvarado, Cecilia Viviana. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones MĂ©dicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones MĂ©dicas; ArgentinaFil: Paz, Leonardo A.. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones MĂ©dicas; ArgentinaFil: Urtreger, Alejandro Jorge. Universidad de Buenos Aires. Facultad de Medicina. Instituto de OncologĂ­a ; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones MĂ©dicas; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas; ArgentinaFil: Vazquez, Elba Susana. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Ciudad Universitaria. Instituto de QuĂ­mica BiolĂłgica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de QuĂ­mica BiolĂłgica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Costas, Monica Alejandra. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de Investigaciones MĂ©dicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones MĂ©dicas; Argentin

    Vulnerability analysis in complex networks under a flood risk reduction point of view

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    The measurement and mapping of transportation network vulnerability to natural hazards constitute subjects of global interest for a sustainable development agenda and as means of adaptation to climate change. During a flood, some elements of a transportation network can be affected, causing the loss of lives. Furthermore, impacts include damage to vehicles, streets/roads, and other logistics services - sometimes with severe economic consequences. The Network Science approach may offer a valuable perspective considering one type of vulnerability related to network-type critical infrastructures: the topological vulnerability. The topological vulnerability index associated with an element is defined as reducing the network’s average efficiency due to removing the set of edges related to that element. In this paper, we present the results of a systematic literature overview and a case study applying the topological vulnerability index for the highways in Santa Catarina (Brazil). We produce a map considering that index and areas susceptible to urban floods and landslides. Risk knowledge, combining hazard and vulnerability, is the first pillar of an Early Warning System and represents an important tool for stakeholders of the transportation sector in a disaster risk reduction agenda.Peer Reviewe
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