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A simple and easy hydrothermal process has been employed to synthesize flower-like ZnO products consisting of numerous orderly oriented and bundled nanorods.The structure and morphology of the novel ZnO structure are characterized in detail.The flower-like ZnO-nanorod-based gas sensors are investigated for their ethanoi-sensing properties,and the results reveal that the sensors exhibit a high response of 143.6 to 1000 ppm ethanol and good selectivity at the optimal operating temperature of 250℃.The effect of the flower-like morphology on the response of the gas sensors to ethanol is also investigated. 相似文献
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一种多逆变器太阳能光伏并网发电系统的组群控制方法 总被引:4,自引:3,他引:1
对光伏发电系统中的光伏阵列一逆变器对进行轮循分组控制,在逆变器输入功率小于设定的下限阈值时,部分光伏阵列并联后连接到一台逆变器输出;在并联开关分合闸过程中,一直保持光伏阵列以最大功率不问断输出;并且该方法对光照突变情况进行自适应判断,作为控制的预启动条件。此方法的优点是:能够同时提高逆变器和光伏阵列的转换效率,改善电能质量,降低并联开关和逆变器的动作次数,延长设备使用寿命,并且控制过程系统输出功率平稳。 相似文献