排序方式: 共有16条查询结果,搜索用时 483 毫秒
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Qiu Caihao Su Yishi Yang Jingyu Chen Boyang Kong Lingti Ouyang Qiubao Zhang Di 《Metallurgical and Materials Transactions A》2022,53(4):1308-1321
Metallurgical and Materials Transactions A - Precipitates including Al3Li, Al3Zr and core–shell structured Al3Li (Al3Zr) produce significant strengthening effects in Al-Li alloys by means of... 相似文献
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Caihao Deng Peixiong Gao Linfeng Lan Penghui He Xin Zhao Wei Zheng Wangshou Chen Xizhou Zhong Yunhui Wu Lan Liu Junbiao Peng Yong Cao 《Advanced functional materials》2019,29(51)
Stretchable/wearable strain sensors are attracting growing interest due to their broad applications in physical and physiological measurements. However, the development of a multifunctional highly stretchable sensor satisfying the requirements of ultrahigh sensitivity (able to distinguish sound frequency) remains a challenge. An ultrasensitive and highly stretchable multifunctional strain sensor with timbre‐recognition ability based on high‐crack‐density vertical graphene (VGr) is fabricated using an ultrasonic peeling (UP) method. It can distinguish frequencies of sounds higher than 2500 Hz. Detailed microscopic examinations reveal that their ultrahigh sensitivity stems from the formation of high‐density nanocracks in the graphitic base layer, which is bridged by the top branched VGr nanowalls. These nanocracks cut the VGr film into a large number of nanopieces, which increase the natural frequency of the sensors, enabling the sensors to distinguish the sound frequency. Demonstrations are presented to highlight the sensors' potential as wearable devices for human physiological signal and timbre detections. This is the first multifunctional highly stretchable strain sensor with timbre‐recognition ability. 相似文献
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分布式发电及其对电力系统的影响 总被引:137,自引:31,他引:106
介绍了分布式发电的概念和几种新兴的分布式发电技术,分析了分布式发电的市场前景及其对现有电力系统可能带来的影响,认为分布式发电潜在优势明显,市场前景广阔,对现有电力系统将带来深远的影响。 相似文献
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容错是应用分布式并行计算系统时必须解决的一个关键难点.在基于广域网络的新型计算环境下实现基于进化算法的电力系统优化应用时,需要对大量个体进行频繁的迭代评估,现有的各类容错技术难以实现对此类应用的高效容错.文中结合进化算法概率性搜索、个别个体失效不会影响系统整体性能的特点,提出以父代个体取代未按时返回的子代个体的方式实现容错,并结合基于差异进化算法的无功优化问题对所提出的方法进行了仿真分析.IEEE 118节点系统测试表明该方法能以优化性能的降低为代价实现高效容错.在该容错手段支持下,可通过采用更大范围网络计算资源基础上更大的群体规模,取得一致性更好、更接近全局最优的解. 相似文献
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首先,为了解决传统边介数理论中电网潮流传输仅走最短路径的缺点,提出了加权极大边介数的概念,该指标在一定程度上结合了电网拓扑和当前运行方式对分区的影响,使得分区方法更适用于实际电网;进一步,提出了分区终止判据,有效地利用了关键支路,在减少了计算量的同时防止了孤立节点单独成区的现象发生;最后,在电网分区的基础上搜索割集得出断面。在某实际电网中的应用验证了该算法在关键断面搜索中的可行性。与现有的断面搜索方法相比,该算法能搜索出更薄弱的断面,并且不依赖于过载支路的选取,也不要求计算网络的所有割集,更适用于实际电网。 相似文献