排序方式: 共有33条查询结果,搜索用时 7 毫秒
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采用填充聚合法制备了相变颗粒改性聚酰胺复合材料.在摩擦速率为6~24 m/s条件下的测试结果表明:相比纯聚酰胺,所得聚酰胺复合材料具有明显更低的摩擦系数和磨损率,并且对摩擦速率呈现一定的自适应性.当复合材料中相变颗粒含量较少时(质量分数5%),复合材料对摩擦速率的自适应能力较弱,而当复合材料中相变颗粒含量较多时(质量分数10%),复合材料的自适应能力较强.纯聚酰胺的磨损模式为严重的黏着磨损;5%相变颗粒改性聚酰胺复合材料呈现典型的磨粒磨损和轻微的黏着磨损,而10%相变颗粒改性聚酰胺复合材料以轻微的磨粒磨损和轻微的疲劳磨损共存. 相似文献
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现货市场是中长期电力交易与实时运营之间的重要纽带.为进一步完善电力现货市场运营机制,推进现货市场的建设,实现异构市场的融合,考虑电力现货市场运营模式、价格机制、市场出清、现货与中长期协调等对电力现货市场的影响,多角度分析了电力现货市场运营机制设计的关键影响因素,构建了包括电力现货运营规模、运营机制运行效率、综合效益等维度的评价指标体系,并利用综合权重法进行加权融合权重优化,考虑模糊和不确定的信息处理,避免主观因素对评价客观性的影响,采用D-S-ERA评价方法对电力现货市场运营机制进行综合评价,有效地评估出了电力现货市场运营机制的优劣,论证了所提指标体系和评价方法的科学性,为支撑我国电力现货市场建设提供借鉴和理论支撑. 相似文献
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关于四元数矩阵的最佳逼近问题 总被引:1,自引:0,他引:1
通过使用四元数矩阵的广义奇异值分解,给出了四元数矩阵最佳逼近问题‖AHXA-C‖2F+‖BHXB-D‖2F=min,
s.t. XH=X的一般表达式. 相似文献
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四元数矩阵的奇异值分解及其应用 总被引:8,自引:0,他引:8
In this paper, a constructive proof of singular value decomposition of quaternion matrix is given by using the complex representation and companion vector of quaternion matrix and the computational method is described. As an application of the singular value decomposition, the CS decomposition is proved and the canonical angles on subspaces of Q^n is studied. 相似文献
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This paper studies the electronic structure and native defects in transparent conducting oxides CuScO2 and CuYO2 using the first-principle calculations. Some typical native copper-related and oxygen-related defects, such as vacancy, interstitials, and antisites in their relevant charge state are considered. The results of calculation show that, CuMO2(M = Sc, Y) is impossible to show n-type conductivity ability. It finds that copper vacancy and oxygen interstitial have relatively low formation energy and they are the relevant defects in CuScO2 and CuYO2. Copper vacancy is the most efficient acceptor, and under O-rich condition oxygen antisite also becomes important acceptor and plays an important role in p-type conductivity. 相似文献
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