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network defects
相关语句
  网络缺陷
     NETWORK DEFECTS AND ULTRA-VIOLET ABSORPTION MECHANISM OF NON-CRYSTAL TiO_2-SiO_2
     非晶态TiO_2-SiO_2的网络缺陷与紫外吸收机制的研究
短句来源
     ESR Studies on Network Defects and Ti Coordination Structure in Non-Crystal TiO_2-Sio_2
     非晶态TiO_2-SiO_2网络缺陷和Ti配位结构的ESR研究
短句来源
     The energy levels of non-bridge oxygen and E' center, the network defects in non-crystal TiO2-SiO2 were discussed. The mechanism of shifting UV absorption edge of tetanium-containing vitreous quartz to long wave was given.
     分析了非桥氧,E'心等网络缺陷的能级结构,探讨了含TiO_2熔石英紫外吸收边界向长波移动的物理机制。
短句来源
  相似匹配句对
     c network.
     针对特殊的网络分析了纳什均衡的性质;
短句来源
     NETWORK
     网络
短句来源
     Aesthetic Defects of Network Literature Inditing
     论网络文学创作的审美缺陷
短句来源
     On the Adjustment with Rank-Defects of a Free Network
     论亏秩自由网平差
短句来源
     defects in means;
     有明显的方法缺陷 ;
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  network defects
Influence of dendrite network defects on channel segregate growth
      
By investigating the effect of various powdered oxides on network formation in phenolformaldehyde oligomers, it has been established that nonionogenic oxides increase the number of network defects in proportion to the surface energy of the powder.
      
It is pointed out that network defects favour the effect of constraint release.
      
Effect of carbon network defects on the electronic structure of semiconductor single-wall carbon nanotubes
      
Below Tg, the geometry of the distribution of network defects is Euclidean and has a dimension d=3.
      
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The energy levels of non-bridge oxygen and E' center, the network defects in non-crystal TiO2-SiO2 were discussed. The mechanism of shifting UV absorption edge of tetanium-containing vitreous quartz to long wave was given.

分析了非桥氧,E'心等网络缺陷的能级结构,探讨了含TiO_2熔石英紫外吸收边界向长波移动的物理机制。

The defects in the polymer gel network produced by polymerization is universal, which, in general, affects the physical and chemical properties of polymer materials. In present paper, we obtain the probability and the number of dangling loopa kind of polymer network defect by analyzing the growth of polymer network with the aid of polymer statistical theory.

应用高分子反应统计理论 ,分析了高分子网络的形成过程 ,讨论了Af 型自由基均聚反应凝胶网络中的缺陷悬吊环的数目及其形成几率 .

Power transformer is one of the key equipment of the power system,so it is valuable for power transformers to discover the incipient fault timely and truly.BP algorithm is used to iterate by gradient decline method of error function,so its convergence speed is slow,and easily settles into local small extremum,and the concrete extremum position is closely related to the initialization of the weights.Traditional genetic algorithm is similar to the exhaustive heuristic search,though it is a global search.That causes...

Power transformer is one of the key equipment of the power system,so it is valuable for power transformers to discover the incipient fault timely and truly.BP algorithm is used to iterate by gradient decline method of error function,so its convergence speed is slow,and easily settles into local small extremum,and the concrete extremum position is closely related to the initialization of the weights.Traditional genetic algorithm is similar to the exhaustive heuristic search,though it is a global search.That causes inevitably the searching time too long.This paper improves the simple genetic algorithm and makes up of the hybrid algorithm combining genetic algorithm with BP algorithm.It is applied to the wavelet neural network for the power transformer fault diagnosis by dissolved gas-in-oil analysis.The hybrid algorithm makes use of the improved genetic algorithm to optimize the four original parameter of the wavelet neural network first,then makes use of the gradient descent algorithm to train the wavelet neural network.In view of actual situation,in the genetic algorithm,the chromosome code adopted real number and self-adaptive probabilities of the crossover and mutation is adopted in order that the genetic algorithm not only maintains the wavelet neural network characteristics,but also avoids the wavelet neural network defects.Simulation results show that the problem is solved and wavelet neural network settles into local small extremum so easily that the network surging will increase and the network will not be convergent if the initialization is unreasonable,and overcomes the shortcoming that the speed is too slow if using genetic algorithm to train neural network independently.Simulation result of 456 power transformer fault diagnosis by the trained wavelet network with hybrid algorithm indicates that the train speed and the diagnosis accuracy is improved to some extent.That shows the validity of that method in power transformer fault diagnosis by dissolved gas-in-oil analysis.

为克服电气分析应用中BP网络算法遇到的困难,改进基本遗传算法并将其与BP算法相结合构成混合算法应用到基于油中溶解气体分析的变压器故障诊断的小波神经网络的训练中。混合算法先利用改进后的遗传算法优化小波神经网络的4个初始值,再利用梯度下降算法训练小波神经网络。针对实际情况,对所采用的遗传算法运用实数编码,采用通过自适应调整的交叉和变异概率,使遗传算法在广泛的空间搜索,向解的方向尽快收敛。仿真结果表明,该算法有效解决了小波网络若初值设置不合理,极易进入局部极小的区域使网络振荡增大、不收敛及GA算法独立训练神经网络速度缓慢等缺点。用训练过的该小波神经网络模型对456台次的变压器故障进行验证和诊断的仿真结果表明,该算法具有较快的收敛速度和较高的计算精度,证实了该算法应用于电力变压器故障诊断的有效性。

 
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