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质子交换膜燃料电池(PEMFC)的产业化开发 总被引:1,自引:0,他引:1
本文简述了燃料电池的研发概况;综述了国内、外质子交换膜燃料电池(PEMFC)的技术状态;分析了PEMFC关键技术及其在商品化过程中存在的主要问题;研究了PEMFC产业化开发的方向;认为我国应加强PEMFC的开发力度,加速它的产业化进程. 相似文献
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水利工作中形成的资料档案,是水利建设成果的历史记录,它是今后水利建设重要的信息资源,是水利管理工作决策的重要依据,在水利发展与改革中起着不可替代的作用. 相似文献
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由于无线介质的开放性,传统的基于安全协议的无线网络安全存在隐患,基于物理层的射频指纹(RFF)识别,具有特征难以伪造的优点,能有效提高无线网络的安全性.针对多场景、多设备识别任务,构建了基于注意力残差卷积神经网络的射频指纹识别方法.实验采集构建了完备的数据集,数据集包含32个Wi-Fi模块,覆盖802.11b标准的2.4 GHz模块.对比结果表明:该方法在32个Wi-Fi模块的识别中达到90%的识别精度,高于传统算法86%的识别率和卷积神经网络方法的89%的识别率;不同采样率的数据集在2 dB时均可以达到90%以上的识别精度,最终在信噪比(SNR)大于20 dB时,识别精度可以达到96%. 相似文献
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Nickel-metal hydride (Ni/MH) batteries are one of promising batteries for electric vehicle applications, but at high temperature the charge efficiency of nickel electrode is very low. In order to improve the high-temperature-efficiency of nickel electrode, spherical nickel hydroxide mixed with various ratios of Lu2O3 was used as active material of pasted nickel electrodes. The results of charge/discharge experiments, cyclic voltammetric measurements and XRD characterizations have shown that after addition of Lu2O3, the oxygen evolution overpotcntial is elevated much, the charge efficiency of nickel electrode at high temperature is greatly improved and the content of β-NiOOH phase increases in charged electrodes. In addition, the mixed ratio of Lu2O3 has different effects on high temperature performances of nickel electrode at different charge/discharge currents, 3.5 % is the optimum mixed ratio, and the action of Lu2O3 on high temperature electrochemical behaviors is more apparent when nickel electrodes are charged at small current than large current. 相似文献
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