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The transient backscattering mechanisms of a dipole array with reflector have been investigated from different aspects: time-domain, frequency-domain, and combined time-frequency domain, using 4 × 8 dipole arrays with reflector as an example. The data of scattering from the arrays under the incidence of Gaussian pulses are obtained by finite differential time domain method. The influences of the array structural parameters, incident wave parameters, and incident angles on the waveforms, spectrum, and time-frequency representations of the backscattered fields of the arrays are analysed and conclusions are drawn. From these characteristics and conclusions, it is possible to deduce the array structure inversely from the backscattered field. 相似文献
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红外光谱等方法对某未知样品的定性定量分析 总被引:1,自引:0,他引:1
利用红外光谱,热分析及红外光谱-色谱联联用技术对某未知样品进行了分析。通过分析。可知该物质为丙三醇硬脂酸单脂。并含有少量的硬脂酸甲酸和十六烷基酸甲酯,这两种微量物物质的比为1:2。 相似文献
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调制差示扫描量热法研究玻璃化转变温度 总被引:3,自引:0,他引:3
对比了DSC与MDSC试验技术的差别, 列举了MDSC的优点,MDSC不但可以给出普通DSC的所有信息,而且给出更多的普通DSC无法提供的信息。MDSC特别适合于复杂转变、弱的转变分析,可以寻找出隐藏在熔融及结晶过程中的玻璃化转变。MDSC对于试验条件的选择比较苛刻,在选择好基本的试验参数的前提下,还需要设置调制周期、调制振幅等参数。 相似文献
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