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玉米叶片形态建模与网格简化算法研究 被引量:24
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作者 肖伯祥 郭新宇 +2 位作者 王纪华 郑文刚 王丹虹 《中国农业科学》 CAS CSCD 北大核心 2007年第4期693-697,共5页
【目的】协调禾本科作物形态模型的可视化效果和计算效率之间的关系。【方法】提出一种利用非均匀有理B样条(NURBS)插值结合使用多直线段分裂算法(splitting)来重建玉米叶片三维形态并实现曲面网格简化控制的方法。【结果】该方法利用... 【目的】协调禾本科作物形态模型的可视化效果和计算效率之间的关系。【方法】提出一种利用非均匀有理B样条(NURBS)插值结合使用多直线段分裂算法(splitting)来重建玉米叶片三维形态并实现曲面网格简化控制的方法。【结果】该方法利用三维数字化仪采集的数据点,通过计算节点矢量、差值计算反求曲面控制点等步骤构造出玉米叶片曲面,具有较强地真实感效果;根据叶片形态特征,采用多直线段分裂算法的逆运算来对叶片曲面网格数量进行简化,在尽可能保持曲面特征的同时可显著降低网格数目。【结论】应用该方法进行玉米冠层可视化与光分布计算,结果表明,在不显著增大计算误差的前提下,可以明显地提高计算效率。 展开更多
关键词 玉米叶片 NURBS 形态建模 网格简化 光分布计算
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植物功能结构模型研究的回顾与展望 被引量:14
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作者 康孟珍 《系统仿真学报》 CAS CSCD 北大核心 2012年第10期2039-2048,共10页
植物功能结构模型(Plant Functional-Structural Model,FSPM)是一类对植物形态结构、生物量的产生和分配以及两者的内在联系进行建模的植物模型的总称,是在单个器官层次对植物这一复杂系统的建模与仿真。介绍植物功能结构模型的应用领域... 植物功能结构模型(Plant Functional-Structural Model,FSPM)是一类对植物形态结构、生物量的产生和分配以及两者的内在联系进行建模的植物模型的总称,是在单个器官层次对植物这一复杂系统的建模与仿真。介绍植物功能结构模型的应用领域,回顾其中的结构模型、功能模型以及光照模型的发展,梳理当前植物功能结构模型的研究现状,探讨未来的研究方向。 展开更多
关键词 光分布计算 结构模型 功能模型 GreenLab 预测 优化
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Parallel Implementation of Global Illumination Using PVM
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作者 孙济洲 Nicolas D Georganas 《Transactions of Tianjin University》 EI CAS 2002年第3期178-182,共5页
In this paper an attempt of employing network resources to solve a complex and time-consuming problem is presented. The global illumination problem is selected as the study objective. An improved density estimation al... In this paper an attempt of employing network resources to solve a complex and time-consuming problem is presented. The global illumination problem is selected as the study objective. An improved density estimation algorithm is first developed, in which the more inherent concurrency is explored. Then its parallel implementation by using a PVM mechanism and the running performance analysis are provided. The analysis results show the expected speed-up obtained and demonstrate that the PVM has good application prospects for parallel computation in a distributed network. 展开更多
关键词 parallel computation parallel virtual machine(PVM) global illumination distributed network
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Optical-fiber distributed temperature sensor:design and realization 被引量:1
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作者 MENG Ling JIANG Ming-shun +1 位作者 SUI Qing-mei FENG De-jun 《Optoelectronics Letters》 EI 2008年第6期415-418,共4页
Through analyzing theoretically the temperature effect of the optical-fiber Raman backscattering,a distributed temperature sensor is designed based on the single-mode fiber. Demodulation methods of temperature transdu... Through analyzing theoretically the temperature effect of the optical-fiber Raman backscattering,a distributed temperature sensor is designed based on the single-mode fiber. Demodulation methods of temperature transduction are compared,and then the demodulation method using the ratio of the anti-Stokes and the Stokes Raman backscattering intensity is adopted. Both the hardware composition and the software realization of the system are introduced in detail. The experiment shows that the distinguishing ability of the temperature and that of the space are 1℃ and 2m,respectively,and that the system response time is about 180 s with a sensing range of 5km and with a temperature measurement range of 0-100℃. 展开更多
关键词 分布 温度敏感度 信号传输 计算机技术
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Optimization of the cavity facet coating in high power GaN-based semiconductor laser diodes 被引量:1
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作者 FENG MeiXin ZHANG ShuMing +7 位作者 JIANG DeSheng WANG Hui LIU JianPing ZENG Chang LI ZengCheng WANG HuaiBing WANG Feng YANG Hui 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第4期883-887,共5页
A method to calculate the reflectivity of the coated cavity facet was proposed, and the distribution of the optical power near the two coated cavity facets was calculated for GaN-based laser diodes. A new design metho... A method to calculate the reflectivity of the coated cavity facet was proposed, and the distribution of the optical power near the two coated cavity facets was calculated for GaN-based laser diodes. A new design method for reducing the optical power at the two cavity facets without changing the output power of laser diodes was discussed, which is helpful to optimize the cavity facet coating and raise the threshold current at which catastrophic optical damage occurs. 展开更多
关键词 GaN-based laser diodes facet coating AR coating HR coating COD
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