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931.
Relative cross sections, differential in energy and angle, for electrons ejected from CH4 and C3H8 molecules under 16.0 keV electron impact have been measured. Electrons were analyzed by a 45° parallel plate electrostatic
analyzer at emission angles varying from 60° to 135° with energies from 50 eV to 1000 eV. The angular distributions of electrons
exhibit structures which are found to arise from Coulomb and non-Coulomb interactions. Furthermore, the double differential
cross sections of electrons ejected from C3H8 molecule are found to be higher in magnitude than those from CH4. This result supports the fact that the number of ejected electrons participating in collisions with C3H8 molecules is more than that in CH4. Also, the angular distributions of C-K-shell Auger electrons emitted from the target molecules have been studied and shown
to be isotropic within the experimental uncertainty 相似文献
932.
GONG Heng-xiang HE Yun-yao Wang Qi-feng JIN Guo-juan FANG Ze-bo WANG Yin-yue 《半导体光子学与技术》2004,10(2):97-100
Polycrystalline ZnO films were prepared on glass wafer using Zn targets by radio frequency(RF)reactive sputtering technique under different deposition conditions.X-ray diffraction (XRD) and optical transmittance spectrum were employed to analyze the structure and optical character of the films.The strain and stress in films, as well as the packing density are calculated in terms of refractive index of films measured with an elliptic polarization analyzer.It is the deposition conditions that have great effects on the structural and optical properties of ZnO films.Under the optimal conditions,the only evident peak in XRD spectrum was (002) peak with the full width at half maximum (FWHM) of 0.20° showing the grain size of 42.8 nm.The packing density,the stress in (002) plane and the average optical transmittance in the visible region were about 97%,-1.06×10~9 N/m~2 and 92%, respectively. 相似文献
933.
2DNMR谱的自动归属是核磁共振发展的一个方向,CAPRI即是蛋白质1H谱的计算机辅助谱峰归属的一种程序。作者将其应用于眼镜王蛇神经毒素CM-111H谱的归属,讨论了CAPRI的功能和特点以及运用在CM-11后得到的分析结果。 相似文献
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938.
高增益和宽1dB增益带宽天线具有重要意义。文中提出一种E 波段全介质菲涅尔(Fresnel)波带透镜
天线,它包括一个菲涅尔波带透镜以及一个作为馈源的喇叭天线。透镜对电场进行操控,使穿过透镜的电磁波相位变
化满足需求,从而使透镜口径面处的电场分布更加均匀。与传统菲涅尔透镜的焦点电场相比,本透镜在焦点处的电场
值约提高了1. 6~3. 0 V,说明透镜的聚焦特性提高,从而实现更高的增益和带宽。该透镜天线的口径为72 mm,整体剖
面高度仅为52. 47 mm,焦径比为0. 66。透镜采用3D 打印技术进行加工,降低了加工成本。与传统菲涅尔透镜相比,实
测结果表明,该透镜天线在70 GHz 峰值增益达到了27. 5 dBi,1 dB 增益带宽34. 2% (63~89 GHz),占总带宽85. 53%。 相似文献
939.
J. Franzen 《Journal of separation science》1979,2(6):324-328
In contrast to traditional theoretical approaches by calculation of (nonexistent) theoretical plates, a unified theory of gas chromatography as given by a definition of the resolution analogue to methods in signal processing or spectroscopy using the well-known Kovacz indices as fundamental scale. A derivation of the thusly defined resolution from basic physical principles yields very practical formulae for peak width, maximum load, substance flow in peak maximum, concentration of substance in the carrier gas and other interesting parameters in dependence of capillary diameter, capillary length, film thickness, carrier gas speed, viscosities etc. Diagrams show favourite conditions for detectors responding on absolute substance flow (e.g. FID) or on concentrations. 相似文献
940.
Summary The criterion for an exponentially modified Gaussian (EMG) peak presented is based on the rule of the peak width for an EMG peak. An EMG peak can be judged by the agreement between the value of the peak width calculated from this rule and that measured from a real chromatographic peak. 相似文献