排序方式: 共有18条查询结果,搜索用时 15 毫秒
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1机车"重造"的概念 从传统意义上讲,一台机车的一生与人相比有着相似的经历.首先,在机车制造厂经过许多加工工序,然后再经组装、试验,完毕后交到用户就开始它的漫漫旅程. 相似文献
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为了节省360°全景视频的编码时间,对通用视频编码标准中的编码单元划分决策过程进行了研究,提出了一种面向360°全景视频的帧内预测编码的快速算法。通过优化编码树单元(Coding Tree Unit, CTU)的编码深度范围和编码单元的划分模式的选择过程,减少编码时间。实验结果表明,在全帧内模式下,所提算法比原始算法平均可以节省34.33%的时间复杂度,同时带来的BDBR平均增量仅为1.665%,BDPSNR的平均降低量仅为0.076 dB。 相似文献
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A mathematical model for describing the relationship between electrical conductivity and the thickness of bilayer, ratio of sublayer thickness of a nano-scale multilayer material (MLM) is presented. Fe/Cu MLM was synthesized by electron beam physical vapor deposition (EB-PVD) technique, and the dependence of electrical conductivity of Fe/Cu MLM on the bilayer thickness and ratio of sublayer thickness were investigated. It is shown that the electrical conductivity of Fe/Cu MLM with fixed ratio of sublayer thickness decreases sharply when the thickness of bilayer becomes thinner than 30 nm. When the bilayer thickness is kept constant, the electrical conductivity linearly decreases with the increasing ratio of sublayer thickness. The values of parameters in the model were obtained by fitting the measured results of electrical conductivity of Fe/Cu MLM with fixed ratio of sublayer thickness. It is found that the calculated values agree well with measured ones. 相似文献
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Prediction of disruptions caused by locked modes using the Back-Propagation (BP) neural network is completed on J-TEXT tokamak. The network, which is based on the BP neural network, uses Mirnov coils and locked mode coils signals as input data, and outputs a signal including information of prediction of locked mode. The rate of successful prediction of locked modes is more than 90%. For intrinsic locked mode disruptions, the network can give a prewarning signal about 1 ms ahead of the locking-time. For the disruption caused by resonant magnetic perturbation (RMPs) locked modes, the network can give a prewarning signal about 10 ms ahead of the locking-time. 相似文献
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石墨砂型铸渗机理的研究 总被引:4,自引:2,他引:4
通过热力学、动力学分析计算,结合倾倒试验结果,对石墨砂型铸造渗碳过程的渗碳机理进行了研究,首次明确提出了石墨砂型铸渗机理。研究认为,石墨在钢液中的直接溶解及碳在钢中的扩散是产生石墨砂型铸渗效果的主要原因 相似文献