排序方式: 共有62条查询结果,搜索用时 203 毫秒
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生物质洁净能源研究中的流化床动力学模型 总被引:1,自引:0,他引:1
分别对最小流化床、鼓泡流化床和腾涌流化床及相应的全混模型、鼓泡模型、气泡汇集模型等加以综述 ,分析其优缺点 ,并在此基础上提出动力学模拟研究的新思路 .根据流化床内在的本质———流化态的不同 ,将流化床分为最小流化床、鼓泡流化床和腾涌流化床三种 .总结了前人针对各种流化床提出的全混模型、鼓泡模型、气泡汇集模型等思想 ,建议今后可以在以下几个方面进行深入研究 :⑴使得模型更有普适性 .⑵由于气泡有效直径尚不能在理论上求得 ,可以在理想气泡直径变化公式的基础上 ,加入非线性化学的计算 .⑶确定不同情况下的参数 ,使得工作更有延续性 ,也使得模型更加具有生命力 .⑷从高压的角度去进行模型的计算 ,并得到相应的试验数据支持 . 相似文献
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采用傅里叶变换光谱技术(FTS)记录了CH^35Cl3和它的同位素分子CH^35Cl2^37Cl的V=3的高分辨光谱,由于0.02m^-1分经不足以分辨K结构,我们将所观察到的谱线近似归属为K=0的转动能级,归属了CH^35Cl3岔子4〈J〈73,CH^35Cl^37Cl分子6〈J〈53的转动级。最后采用最小二乘法拟合,得到了关于J的转动常数和振动带心。 相似文献
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朱清时 《中国科学B辑(英文版)》1991,(10)
The stretching vibrational overtone bands (3000), (4000) and (5000) of silane are recorded on a Fourier transform spectrometer with a specially made multipass cell at a resolution of 0.01 cm-1. The spectra show a striking symmetrical top rotational structure, which has been predicted as the limiting case of a spherical top exhibiting local mode behavior, and provides an excellent chance to study the local mode rotational structures in detail. This article reviews the interpretation and analysis of the spectra in both local mode and normal mode pictures. The intramolecular dynamics following initial single bond excitation is also discussed. 相似文献
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Three-dimensional ab initio dipole moment surfaces and stretching vibrational band intensities of the XH3 molecules 总被引:1,自引:0,他引:1 下载免费PDF全文
Stretching vibrational band intensities of XH3 (X=N, Sb) molecules are investigated employing three-dimensional dipole moment surfaces combined with the local mode Hamiltonian model.The dipole moment surfaces of NH3 and SbH3 are calculated with the density functional theory and at the correlated MP2 level,respectively. The calculated band intensities are in good agreement with the available experimental data. The contribution to the band intensities from the different terms in the polynomial expansion of the dipole moments of four group V hydrides (NH3, PH3,AsH3 and SbH3) are discussed. It is concluded that the breakdown of the bond dipole approximation must be considered. The intensity “borrowing” effect due to the wave function mixing among the stretching vibrational states is found to be less significant for the molecules that reach the local mode limit. 相似文献
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朱清时 《光谱学与光谱分析》1983,(1)
激光光谱技术使光谱学进入一个新纪元,它大大地提高了光谱分辨率,提供了进一步认识物质结构及其相互作用细节的有力工具。但是,这些高分辨的激光光谱(激光激发荧光光谱和红外半导体激光光谱等)往往包含大量的光谱峰,其频率的绝对测量通常都是十分困难的。本文介绍一些新技术,用计算机来控制实验并自动进行测量。它们不仅可以大大减轻研究者的劳动,使实验变得更快更容易,而且可以使实验测量达到人力不及的精度。 相似文献