排序方式: 共有14条查询结果,搜索用时 31 毫秒
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我们制得了硫氨酸轮与二苯并-18-冠-6(DBC)的固体络合物,进行了元素分析、X光衍射、红外光谱、紫外光谱和差热、热重分析,对其合成条件及性质进行了一些探讨。 相似文献
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KCl/mobil composition of matter-41 (MCM-41) composite has been synthesized via a heat-treating process and characterized by x-ray diffraction, high resolution transmission electron microscopy, and nitrogen adsorption/desorption isotherms. In contrast with pure MCM-41, KCl/MCM-41 composite exhibits improved humidity sensing properties within the relative humidity range of 11-95%. The impedance of KCl/MCM-41 composite changes by about four orders of magnitude over the whole humidity range with the response time and the recovery times are about 30s and 35s, respectively. Small humidity hysteresis and good stability are also observed based on our product. These results make our product a good candidate in fabricating humidity sensors with high performances and low synthetic complexity. 相似文献
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用扬声器演示李萨如图形 总被引:1,自引:1,他引:0
在普通物理实验教学中,多用示波器观察李萨如图形,虽图形稳定,但不够直观。用电振音叉演示李萨如图形,由于电振音叉的固有频率不可调,只能观察到一种李萨如图形,而且也很难使图形稳定。既使有频率值存在一简单比值的音叉可供更换,也十分不便。本装置采用扬声器演示李萨如图形,不仅直观,而且同样可以得到各种稳定的李萨如图形。 相似文献
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First-principles study of structrural and corrected band properties of wurtzite Zn1-xCdxO and Zn1-xMgxO systems
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A first-principles method based on density functional theory(DFT),a generalized gradient approximation(GGA),and a projector-augmented wave(PAW) are used to study the structual and band properties of wurtzite Zn1-xCdxO and Zn1-xMgxO(0 ≤x≤1) ternary alloys.By taking into account all of the possible structures,the band gaps of Zn1-xCdxO and Zn1-xMgxO alloys are corrected and compared with experimental data. 相似文献
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