7,200 research outputs found

    Introduction to this special issue on HCI and games

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    Games have been part of human–computer interaction (HCI) research since the first CHI conference in 1982. At that gathering, Tom Malone, then at Xerox PARC, presented insights from the study of computer games to motivate a set of design principles for “enjoyable” user interfaces (Malone, 1982). Over the ensuing years, games-related HCI research has steadily grown as a subarea of CHI (e.g. Keeker, Pagulayan, Sykes, & Lazzaro, 2004; Pausch, Gold, Skelly, & Thiel, 1994), with more rapid acceleration in the last 10 years. A recent metareview (Carter, Downs, Nansen, Harrop, & Gibbs, 2014) analyzed game- and play-related content at CHI between 2003 and 2013, finding that the overall percentage of the CHI proceedings related to play and games rose from 2.5% to a peak of 9.5% in 2012. In the last few years, venues for game-related HCI work have expanded as well. From 2011 to 2013, two of this special issue’s editors (Bernhaupt & Isbister, 2013) formed a Games and Entertainment Special Community devoted to game-related HCI research at CHI, leading to the permanent addition to CHI venues of a Student Game Design Competition. And in 2014, a new ACM-sponsored conference was created as a specialized peer-reviewed venue for the intersection of HCI and Games—CHI-Play. Game-related research is clearly a valued, integral, and growing segment of HCI research

    Distribuição temporal e espacial do besouro-verde-do-açaizeiro [Macraspis pseudochrysis (Coleoptera: Scarabaeidae: Rutelini)] em açaizeiros de várzea em Mazagão, Amapá.

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    Em diferentes regiões do Estado do Amapá, foi verificada recentemente a ocorrência do besouro-verde-do-açaizeiro (Macraspis pseudochrysis Landin), derrubando as inflorescências de açaizeiro (Euterpe oleracea) em várzeas, provocando preocupação aos produtores, uma vez que a ação deste inseto poderia influenciar na formação de frutos. Com o objetivo de avaliar a distribuição temporal e espacial de M. pseudochrysis, foram realizadas amostragens mensais em inflorescências de E. oleracea em várzea no Campo Experimental da Embrapa Amapá em Mazagão, Amapá. Os açaizeiros eram provenientes de duas regiões do estuário amazônico que apresentam produção de frutos em épocas distintas do ano. A população 1 foi representada por açaizeiros que têm a produção de frutos no período chuvoso do ano (abril a agosto) e a população 2 foi composta por açaizeiros do tipo açaí de verão tendo sua produção de frutos no período de estiagem (agosto a dezembro). No período de maio a outubro de 2011 foram registrados 271 indivíduos de M. pseudochrysis em toda a área experimental. Na população 1 a maior densidade foi obtida em maio, apresentando 3 indivíduos/inflorescência. A população 2 apresentou densidade mais alta em julho com 4 indivíduos/inflorescência. Na maioria das ocasiões de amostragem o padrão de distribuição espacial foi agregado em ambas as populações.bitstream/item/100960/1/CPAF-AP-2014-BPD-82-Besouro-acai-DG3comCGPE.pd

    Eficiencia na irrigaçao para a produçao integrada do meloeiro (Cucumis melo L.)

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    bitstream/CNPAT/7892/1/doc70.pd

    AN ATTEMPT TO LINK THE BRAZILIAN HEIGHT SYSTEM TO A WORLD HEIGHT SYSTEM

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    This paper deals with the geopotential approach to investigate the present BrazilianHeight System (BHS). Geopotential numbers are derived from Global PositioningSystem (GPS) satellite surveying and disturbing potential on selected benchmarks.A model for the disturbing potential can be obtained by an existing set of sphericalharmonic coefficients such as the Earth Gravity Model 2008 (EGM08). Theapproach provides absolute evaluation of local normal geopotential numbers (akaspheropotential numbers) related to a so-called World Height System (WHS). Totest the validity of the proposed methodology, a numerical experiment was carriedout related to a test region in Southern Brazil. The accuracy of the derivedgeopotential numbers was tested versus local normal geopotential numbers based on262 GPS/leveling points. The root mean square error (RMSE) value for metricoffset of BHS derived from geopotential numbers and the disturbing potentialmodeling in the test area was estimated to be near 0.224 meters in the absolute view.Therefore, since these spheropotential numbers are referred to a local datum, theseresults of comparisons may be an indicator of the mean bias of local network due tothe effect of local Sea Surface Topography (SSTop) and possible offset between theunknown reference for the BHS and the quasigeoid model in the region
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