2,131 research outputs found

    Density-equalizing maps for simply-connected open surfaces

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    In this paper, we are concerned with the problem of creating flattening maps of simply-connected open surfaces in R3\mathbb{R}^3. Using a natural principle of density diffusion in physics, we propose an effective algorithm for computing density-equalizing flattening maps with any prescribed density distribution. By varying the initial density distribution, a large variety of mappings with different properties can be achieved. For instance, area-preserving parameterizations of simply-connected open surfaces can be easily computed. Experimental results are presented to demonstrate the effectiveness of our proposed method. Applications to data visualization and surface remeshing are explored

    The Lost Tribes of Charmonium

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    To illustrate the campaign to extend our knowledge of the charmonium spectrum, I focus on a puzzling new state, X(3872)→π+π−J/ψX(3872) \to \pi^+\pi^- J/\psi. Studying the influence of open-charm channels on charmonium properties leads us to propose a new charmonium spectroscopy: additional discrete charmonium levels that can be discovered as narrow resonances of charmed and anticharmed mesons. I call attention to open issues for theory and experiment.Comment: 11 pages, 11 figures, uses espcrc2.sty (included); presented at BEACH 2004, 28 June - 3 July, IIT/Chicag

    Testing the Task-Media Fit: The Effects of Task Equivocality on Social Presence of Mobile Video-Mediated Communication

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    Since social presence theory was introduced, many researchers have tried to apply it to various technology-mediated communication media, including E-Mail, videoconferencing, and instant messengers. Yet few researches have investigated the influence of mobile video-mediated communication (VMC) on the social presence despite prevalence in business practices. In this paper, a research model is developed to test the relationship between the mobile VMC (video telephony and video chatting) and the level of social presence. And the task equivocality, whether it’s an intellective task or a negotiation task, is also considered as moderating variables, based on the task-media fit proposition. Hence, mobile video chatting could be suggested as an alternative media of mobile video telephony for less equivocal informative tasks according to this study
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