On the angular dependence of gaps in 1-D Si/SiO2 periodic structures

A multilayer of silicon and silicon dioxide was used to study the angular dependence of reflectance maxima originating from interference and bulk optical properties. Silicon dioxide has a lattice resonance in the infrared causing an interval of high reflectance for wavelengths around 9 μm. The multilayer was designed such that the interference maxima do not overlap/interact with the material related reflectance maximum. In this way the different angular behavior for the two types of reflectance maxima can be studied simultaneously. Experimental and calculated reflectance spectra for s- and p-polarized light for angles of incidence between 0° and 90° collected for every 5° are presented. The reflectance features caused by interference generally move to shorter wavelengths with increasing angle of incidence, and the materials related peak is widened for (s-polarized light) and excitation of the longitudinal modes was observed for p-polarized light.     

双环掺铒光纤激光器混沌偏振控制方法研究

提出双环掺铒光纤激光器激光混沌的偏振耦合控制以及部分偏振控制方法,偏振耦合控制能控制耦合相互作用以控制激光混沌,部分偏振控制是控制部分偏振耦合效应以控制激光混沌.数值模拟了偏振耦合控制混沌和某一个环的部分偏振控制混沌,它们都能实现把双环掺铒光纤激光器激光混沌控制到稳定态和周期态上;通过实时调控光的偏振方向,这两种混沌控制方法都能实时地、动态地、有效地控制激光混沌进入到稳定态和周期态上.     

三维形貌检测的自动参考栅象法研究

本文提出了一种用于曲面形貌检测的傅里叶变换法中的参考栅象图的自动产生及误差修正方法,通过对实际测量图象的处理,证明该方法具有很好的使用效果,从而大大提高了傅里叶变换法检测曲面形貌的精度和实用性。     

人类对超声的听觉感知及应用前景

本文对人类通过骨传导所产生的超声听觉感知，就以下四方面进行介绍：１．感知的方法、频率和强度范围；２．感知机理；３．可能的应用；４．值得研究的问题。     

非线性Jaynes-Cummings模型中的薛定谔猫态

本文采用密度算符间的距离论证了非线性(强度相关)Jaynes-Cummings模型在初始相干光场很强的条件下光场周期地演化为薛定谔猫态,且薛定谔猫态的特性取决于原子的初态。     

Propagation of partially coherent Gaussian laser beams in graded-index fibres

Using statistical approach the author has solved the equations for the mutual coherence function of partially coherent Gaussian laser beams in graded-index fibres. The expressions for the complex degree of coherence and the intensity distribution have also been shown that the self-focusing length inside the fibre depends upon the degree of coherence. The result have been discussed for both conical and cylindrical guides.     

药用植物追风箭的红外光谱分析

本文首次采用傅里叶红外光谱法对追风箭的根、茎、叶和花进行了对比分析。分析表明同株追风箭的四个部位图谱吸收峰的峰形大体相同,但由于它们所属的部位不同,导致它们的化学成分和相对含量的差异,所以体现了它们各自的特征。文章还分析了追风箭的IR图谱和可能的药物活性之间的关系。实验结果表明,追风箭四者的图谱中在1373 cm-1和1252 cm-1附近均有峰,表明它们均具有活血化瘀的功能,这为其"跌打损伤"的主治药效在分子水平上提供了依据经过整体分析,追风箭含有三萜类化合物、生物碱、芳香族化合物和醇等。本文对民医用药和IR图谱的联系作出了首次初步探索。     

Fe valence state at the surface of the Fe0.5Cu0.5Cr2S4 spinel

Here we present X‐ray absorption measurements of a vacuum cleaved Fe_0.5Cu_0.5Cr₂S₄ single crystal. Measurements at different positions on the cleaved sample surface clearly reveal a difference between the valence state of the Fe ions in the sur‐ face layers and the valency of the Fe ions present in the bulk. These results confirm the findings of recent measurements outlined previously. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

C/O Kerma coefficient ratio for 96 MeV neutrons deduced from microscopic measurements

Double-differential cross sections for neutron-induced light-ion production at 96 MeV have been measured for a variety of nuclei at The Svedberg Laboratory. Using the measured cross-section data, we deduce the Kerma coefficient from carbon and oxygen for p, d, t, ³He and α particles. In order to get the total Kerma for C and O, we add GNASH calculation values where experimental data are not available and obtain a Kerma coefficient of 7.85 ± 0.63 fGy m² for carbon and 7.09 ± 0.57 fGy m² for oxygen. The C/O Kerma coefficient ratio then becomes 1.11 ± 0.11. In addition we determine the Kerma ratio between ICRU muscle and A-150, again adding calculations with the GNASH code where no experimental data are available, and obtain a value of 0.98 ± 0.05. While the Kerma coefficients for carbon and oxygen do not agree with the prediction in ICRU Report 63, the ratio values are in good agreement with existing predictions.     

凝聚映象的不动点及算子方程Ax+Bx+Cx=x的可解性

按文[1]中方法得到几个对凝聚映象的不动点定理,还扩充文[2]中对于算子方程Ax B x=x到Ax B x Cx=x可解性的某些结论.主要结果是定理2、定理3与定理5.