10 research outputs found

    real-time approximate soft shadow rendering on gpu

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    通过对阴影图算法进行扩展,提出一种完全基于GPU的近似软影实时绘制算法,它是一种3遍算法:第一遍从光源中心计算场景的深度图;第二遍采用几何着色器提取物体的轮廓边,同时在轮廓边上生成新的几何图元,利用硬件自动插值功能向外绘制线性近似半影图,并根据第一遍得到的深度图在像素着色器中对背面轮廓形成的半影区进行剔除;对于重叠的半影区设定片元的伪深度值,利用硬件进行自动融合.第三遍分别查询深度图和半影图,确定场景的本影区以及半影区中像素的亮度,从而得到面光源照射下场景的近似软影效果

    an improved approach for generation of intermediate deformation models in shape space

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    在形状空间中,由三角形网格构成的模型可视为空间中的一个点,可以借助黎曼度量对形状空间进行操作,从而实现对模型的变换.改进了已有的操纵形状空间的方法,根据输入模型顶点的位置变化判断是否需要利用黎曼度量计算插值位置,降低了形状空间的维数,提高了运算速度.实验结果显示,混合利用线性插值和利用形状空间计算2种方法的生成模型具有良好的效果

    基于形状空间的模型变化的插值生成

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    在形状空间中,由三角形网格构成的模型视为空间中的一个点.可以借助黎曼度量对形状空间进行操作,从而实现对模型的变换.本文对以前操纵形状空间的方法进行了改进,根据输入模型顶点的位置变化判断是否需要利用黎曼度量计算插值位置,从而降低了形状空间的维数,提高了运算速度.生成的模型混合了线性插值,并得到了良好的效果.中国计算机学

    汽车变速器壳体动态特性分析研究

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    为了解某型号汽车变速器壳体结构动态特性问题,以该型号汽车变速器壳体为研究对象,采用机械结构有限元分析技术与试验模态分析技术相结合的研究方法,对变速器壳体展开结构模态仿真分析与试验模态分析,提取了该变速器壳体动态参数,仿真与试验结果对比:前6阶模态振型变化趋势具有一定相似程度,与之对应模态频率相对误差均在8%以内,有效地验证了壳体模态仿真分析结果的可靠性,同时,有效地反映了汽车变速器壳体结构动态特性,为进一步汽车变速器壳体结构动态优化奠定基础

    2005~2015年CERN光合有效辐射数据集

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    光合有效辐射在生态学、农学以及气候学等多个学科中都有重要的应用价值。它是揭示物质与能量交换过程的基本生理变量,是光合潜力、潜在产量的评估研究和作物生长模拟研究、土壤碳的固定模拟研究中不可缺少的关键数据之一。该数据集涵盖了中国8个典型陆地生态类型、中国生态系统研究网络(CERN)下属的40个辐射观测站观测的光合有效辐射日均值,时间跨度为2005~2015年。通过对传感器的集中标定与规范的数据质量控制方案,保障了观测数据的可靠性与可比性。采用光谱仪、辐射标准灯传递辐射基准方案,对光合有效辐射传感器进行集中标定与比对,标定精度小于5%,符合世界气象组织(WMO)标准;采用极值法对观测的光合有效辐射数据进行质量控制

    JUNO Sensitivity on Proton Decay pνˉK+p\to \bar\nu K^+ Searches

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in pνˉK+p\to \bar\nu K^+ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+p\to \bar\nu K^+ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is 9.6×10339.6 \times 10^{33} years, competitive with the current best limits on the proton lifetime in this channel

    JUNO sensitivity on proton decay p → ν K + searches*

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the pνˉK+ p\to \bar{\nu} K^+ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+ p\to \bar{\nu} K^+ is 36.9% ± 4.9% with a background level of 0.2±0.05(syst)±0.2\pm 0.05({\rm syst})\pm 0.2(stat) 0.2({\rm stat}) events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is 9.6×1033 9.6 \times 10^{33} years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies

    JUNO sensitivity on proton decay pνK+p → νK^{+} searches

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