共查询到20条相似文献,搜索用时 875 毫秒
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制备了铋含量为0~7.33%(质量百分数)的铅铋合金。用线性电位扫描、交流阻抗法以及气体收集实验研究了铅铋合金在硫酸溶液中的析氧行为,确定了相关的电化学动力学参数。研究结果表明,当铅铋合金中铋含量小于0.100%时,铋的存在对析氧反应几乎无影响,而当铋含量大于0.83%时,铋加快氧气的析出,且随铋含量增加,析氧过电位降低,电荷交换反应电阻减小,析氧量增加。 相似文献
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采用线性电位扫描法、气体收集实验以及电化学阻抗法研究了纯铅电极和铅铋[w(Bi)=0.05%]合金电极在硫酸溶液中的析氧反应.阳极极化曲线测量表明,相同电位下,纯铅电极上的析氧电流稍小于铅铋合金电极上的析氧电流;氧气收集实验.表明,相同电位下,纯铅电极上收集到的氧气的体积稍小于铅铋合金电极;交流阻抗实验表明,在两种电极上的析氧反应均受电荷传递控制,且相同电位下,纯铅上的析氧反应电阻略大于铅铋合金电极上的反应电阻.铅铋合金中0.05%铋的存在对析氧反应有催化作用,但影响不大.因而,适量铋的存在并不会增大电池的水损失. 相似文献
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随着锂离子电池应用领域的拓宽和电子产品的快速迭代,对安全性能和极速充电能力提出了更高的要求。在锂离子电池的极速充电过程,易在石墨负极表面析出金属锂,产生电池容量衰减、安全风险增加、使用寿命缩短等诸多问题。阐述了负极析锂的机理。列举了负极析锂的三种分布状态,并说明了这些分布状态形成的原因。分析了负极析锂的影响因素,如电芯N/P值、充电温度、充电倍率、过充、Overhang设计。提出了解决负极析锂的对策。对负极析锂问题的研究现状进行了总结,并提出了未来负极析锂的可能研究方向。 相似文献
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This paper proposes a method for automatic design of the sensory morphology of a mobile robot. The proposed method employs two types of adaptations, ontogenetic and phylogenetic, to optimize the sensory morphology of the robot. In ontogenetic adaptation, reinforcement learning searches for the optimal policy, which is highly dependent on the sensory morphology. In phylogenetic adaptation, a genetic algorithm is used to select morphologies with which the robot can learn tasks faster. Our proposed method was applied to the design of the sensory morphology of a line‐following robot. We performed simulation experiments to compare the design solution with a hand‐coded robot. The results of the experiments revealed that our robot outperformed the hand‐coded robot in terms of the following accuracy and learning speed, although our robot had fewer sensors than the hand‐coded one. We also built a physical robot using the design solution. The experimental results revealed that this physical robot used its morphology effectively and outperformed the hand‐coded robot. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 172(1): 48–57, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20965 相似文献
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针对多选择背包问题,设计了求解该问题的知识进化算法方案,编写了仿真实验的程序,并采用其他文献的算例进行了仿真实验。结果表明该算法的有效性和优越性。本文为求解多选择背包问题提供了一种新的可行方法,同时也拓展了知识进化算法的应用领域。 相似文献
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This paper presents opposition-based differential evolution to determine the optimal hourly schedule of power
generation in a hydrothermal system. Differential evolution (DE) is a population-based stochastic parallel search
evolutionary algorithm. Opposition-based differential evolution has been used here to improve the effectiveness
and quality of the solution. The proposed opposition-based differential evolution (ODE) employs opposition-based
learning (OBL) for population initialization and also for generation jumping. The effectiveness of the proposed
method has been verified on two test problems, two fixed head hydrothermal test systems and three hydrothermal
multi-reservoir cascaded hydroelectric test systems having prohibited operating zones and thermal units with valve
point loading. The results of the proposed approach are compared with those obtained by other evolutionary
methods. It is found that the proposed opposition-based differential evolution based approach is able to provide
better solution. 相似文献
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This paper presents opposition-based differential evolution to determine the optimal hourly schedule of power
generation in a hydrothermal system. Differential evolution (DE) is a population-based stochastic parallel search
evolutionary algorithm. Opposition-based differential evolution has been used here to improve the effectiveness
and quality of the solution. The proposed opposition-based differential evolution (ODE) employs opposition-based
learning (OBL) for population initialization and also for generation jumping. The effectiveness of the proposed
method has been verified on two test problems, two fixed head hydrothermal test systems and three hydrothermal
multi-reservoir cascaded hydroelectric test systems having prohibited operating zones and thermal units with valve
point loading. The results of the proposed approach are compared with those obtained by other evolutionary
methods. It is found that the proposed opposition-based differential evolution based approach is able to provide
better solution 相似文献
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PG9351(FA+e)型燃气轮机压气机的演化过程 总被引:1,自引:0,他引:1
系统地介绍了GE公司重型燃气轮机压气机的发展过程、F型压气机存在的问题以及目前我国PG9351(FA+e)型燃气轮机设备状况,并围绕压气机存在的问题进行了详细分析,介绍了该型燃气轮机所使用的压气机各级叶片的改进增强情况. 相似文献
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