排序方式： 共有57条查询结果，搜索用时 15 毫秒
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基于模糊神经网络的水泥强度预测 总被引：1，自引：0，他引：1
利用软计算技术预测水泥强度不但是一项新的尝试，而且具有较高的理论和应用价值。本文利用模糊神经网络良好的非线性逼近能力建立了水泥强度的模糊神经网络预测模型。模糊神经网络的学习算法采用的是快速的粒子群优化算法。仿真结果表明，该模型在预测水泥28d强度方面达到了很高的精度，有较好的实用价值。 相似文献
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Amino-terminated polyethers and amino-terminated polyurethane were used as curing agent to cure the epoxy resin together and get a series of cured products. The damping properties of the composites were studied by DMA test at different measurement frequencies. Damping mechanical tests show that the flexible epoxy resin has higher loss factor than common epoxy. The highest loss factor reaches 1.57. Also the height and position of loss factor peak of the flexible epoxy resin varies by changing the content of amino-terminated polyethers. Results shows that the flexible epoxy resin can be used as damping polymer materials at room temperature or in common frequency range. 相似文献
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本文采用微波合成新方法合成锂离子电池材料LixMn2O4,讨论了微波合成工艺条件如保温时间等对产物物相的影响,结果表明700℃～800℃是微波合成LixMn2O4的适宜温度范围,合成时间为10～15分钟,比常规合成短很多,同时探讨了微波合成与常规固相方法合成正极材料在物相结构及其电性能等方面的差别.讨论影响电性能的因素如:合成温度、配比等. 相似文献
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用离散变分密度泛函方法(DFT-DVM)研究了(TATB)n,n=1～4的电子结构,讨论了TATB分子之间的相互用.整个TATB分子链上面离子n,n=1～4的电子结构,讨论了TATB分子之间的相互作用.整个TATB分子链上面离子的净电荷是正负相间的.链中间TATB分子中的离子的净电荷绝对值高于两端单个TAT分子中的离子.分子内氢键共价键级比C-C,C-N,N-O和N-H等键约小了一个数量级,而分子间氢键的共价键级又比分子内氢键小了一个数量级.由于分子间氢键的形成,使得成键电子分散,链中间TATB分子的N-O和N-H键的共价键减弱,而C-C和C-N共价键增强.TATB分子之间的相互作用也使得电子的能态降低. 相似文献
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The effects of glass frit on the sintering and electric properties of PMN-PT textured ceramics were investigated. The glass frits, including PbO, Bi2O3 and ZnO, were selected since liquid phase sintering lowered the PMN-PT sintering temperature. The piezoelectric properties of PMN-PT ceramics with glass frit addition are strongly dependent on the densification. The addition of glass frits into PMN-PT matrix reduced the sintering temperature to 1 100 ℃ instead of 1 150 ℃ for samples without glass. The piezoelectric coefficients (d33) of PMN-PT textured ceramics achieved 568 pc/N with 1 wt% excess PbO. 相似文献
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