燃烧温度场计算机层析技术研究

提出了一种利用改进型钠谱线翻转法光谱测量信息进行温度场重建的计算机层析模型和算法，并以7．62mm半自动步枪空包弹膛口温度场进行验证，获得了较好的结果，为枪炮膛内及膛口燃烧温度场的测定提供了一种新的技术手段。     

Infrared optical properties of Bi2Ti2O7 thin films by spectroscopic ellipsometry

Bi₂Ti₂O₇ thin films have been grown directly on n-type GaAs (1 0 0) by the chemical solution decomposition technique. X-ray diffraction analysis shows that the Bi₂Ti₂O₇ thin films are polycrystalline. The optical properties of the thin films are investigated using infrared spectroscopic ellipsometry (3.0–12.5 μm). By fitting the measured ellipsometric parameter (Ψ and Δ) data with a three-phase model (air/Bi₂Ti₂O₇/GaAs), and Lorentz–Drude dispersion relation, the optical constants and thickness of the thin films have been obtained simultaneously. The refractive index and extinction coefficient increase with increasing wavelength. The fitted plasma frequency ω_p is 1.64×10¹⁴ Hz, and the electron collision frequency γ is 1.05×10¹⁴ Hz, and it states that the electron average scattering time is 0.95×10⁻¹⁴ s. The absorption coefficient variation with respect to increasing wavelength has been obtained.     

Investigation of HgCdTe surface quality following Br-based etching for device fabrication using spectroscopic ellipsometry

We have examined the etching of HgCdTe (x=0.2) with bromine/ethylene glycol (Br/EG) solutions. Using a spectroscopic ellipsometer, we tracked the ellipsometric parameters (ψ and Δ) of the freshly etched HgCdTe surfaces. Parameters ψ and Δ were measured periodically as these values changed with the surface exposed to air. A second set of Br/EG-etched samples was stored in deionized (DI) water. We found that DI water effectively preserved the freshly etched HgCdTe surface for a period of several hours. Comparison with the literature on HgCdTe surface chemistry implies that oxide growth is inhibited on the etched HgCdTe samples immersed in DI water. Modeling results based on the measured ψ and Δ values agree with this assessment.     

米洛沙星的波谱特征与结构确证

采用紫外吸收光谱、红外光谱、质谱、核磁共振光谱和单晶X-射线衍射法对米洛沙星进行结构确证。讨论了紫外光谱和红外光谱的特征,详细归属了~1HNMR和~(13)CNMR谱信号,结合X-射线衍射分析结果,最终确证其分子结构。     

Acid-base properties and catalytic activity of metal-organic frameworks: A view from spectroscopic and semiempirical methods

This article summarizes several approaches for understanding the catalytic chemistry and “structure-surface acidity-reactivity” relationships in a multiplicity of catalytic applications of a continually increasing assemblage of metal-organic frameworks (MOFs) structures. The various spectroscopic techniques for acid-base characterization of MOFs are reviewed. The experimental requirements and the type and nature of probe molecules available are also discussed. Special emphasis is given to the revealing of the surface acid-base effect on the catalytic performance of MOFs.     

多层复合泡棉吸波材料应用技术研究

针对泡棉吸波材料加工精度低,尺寸不稳定,在使用过程中易吸水、吸潮进而腐蚀基材的问题,文中对多层复合泡棉吸波材料进行了应用技术研究。介绍了材料多层结构组成、覆膜工艺流程和覆膜尺寸变化规律,提出了以聚氨酯膜层体系代替氯丁橡胶膜层体系的改进方法。采用光谱分析法对2种膜层材料的离子成分以及吸波特性进行了对比测试,并通过环境试验验证了聚氨酯膜层体系的环境适应性。结果表明,改善后的聚氨酯膜层体系的环境适应性明显优于氯丁橡胶体系。该改进方法提升了该类吸波材料的工程应用价值。     

Electron spectroscopic diffraction and imaging of the early and mature stages of calcium phosphate formation in the epiphyseal growth plate

A review of different models of biomineralization in collagen-rich hard tissues shows that further investigations of crystal formation are necessary. The electron spectroscopic diffraction (ESD) mode of operation of an energy-filtering electron microscope offers the possibility of being able to avoid the background from inelastic scattering in selected-area electron diffraction patterns. First experiments on the different stages of mineralization in the epiphyseal growth plate have only indicated the presence of apatite. The ESD mode can be complemented by the electron spectroscopic imaging mode and by elemental mapping of calcium.     

Systematic investigation of spectroscopic factors from (d,p) reactions for deuteron nuclear data evaluation

Spectroscopic factors for the (d,p) reactions on ¹²C, ²⁷Al, ⁴⁰Ca, and ⁵⁸Ni for incident deuteron energies up to 100 MeV were extracted systematically by fitting theoretical distorted wave Born approximation calculations to the existing experimental data. The extracted spectroscopic factors show similar incident energy dependence for all the target nuclei. An empirical expression describing the energy dependence has been deduced and implemented in a computational code system developed specially for deuteron-induced reactions. The calculation with the code system reproduces the measured ²⁷Al(d,p)²⁸Al cross sections in the incident energy range from the threshold to 20 MeV and the measured double-differential cross sections for (d,xp) reactions on ¹²C and ⁵⁸Ni at 56 and 100 MeV fairly well.     

Cr层厚度对Pd/Cr/Co多层膜光学性质的影响

本文利用磁控溅射的方法生长不同Cr插层厚度的Pd/Cr/Co多层膜,并利用椭偏仪对多层膜的光学常数进行测量.得到了入射光波长在250nm-850nm范围内多层膜的折射率、反射率、吸收系数以及复介电常数的曲线,在此数据的基础上分析了Cr插层厚度对多层膜光学参数的影响.