热光效应下的全内反射光束展宽规律以及应用

以热光型器件的热学模型和温度场解析表达式为基础,运用射线法．通过计算位于芯区不同子午面内的光线反射轨迹,对热光效应下光束经全内反射后展宽的原因和规律进行了分析,并且给出了具体光束展宽值的理论计算方法;设计了高反射率的全内反射型有机聚合物热光开关。在设计中应用所提出的规律,理论上计算出了具体的展宽波导宽度、芯区的掩埋深度、扩大的反射区宽度等结构参量。软件的模拟结果表明,该结构在反射态和直通态时的效率分别为82．6％和811．4％,串扰均大于30dB,并且对这些结构参量的模拟优化结果与理论计算结果基本一致。     

理想流体一维绝热稳定流动能量方程推导

对理想流体一维绝热稳定流动作了讨论．对一般理想流体(可压缩或不可压缩)，用两种方法推出了能量方程．在此基础上，讨论了流动可逆性及不同流体性质对流动参数的影响．     

A Complete Classification of Curvature Collineations of Cylindrically Symmetric Static Metrics

Curvature collineations are symmetry directions for the Riemann tensor, as isometries are for the metric tensor and Ricci collineations are for the Ricci tensor. Complete listings of many metrics possessing some minimal symmetry have been given for a number of symmetry groups for the latter two symmetries. It is shown that a claimed complete listing of cylindrically symmetric static metrics by their curvature collineations [1] was actually incomplete and is completed here. It turns out that in this complete list, unlike the previous claim, there are curvature collineations that are distinct from the set of isometries and of Ricci collineations. The physical interpretation of some of the metrics obtained is given.     

Corrected mirror systems with double reflection

We propose objectives consisting of two mirrors with central holes for passage of a light beam. The optical layout ensures multiple reflection of rays from both mirrors. We consider several approaches to calculating the design parameters for which three and four aberrations do not occur. The objectives can be used in optical devices operating in the UV and IR regions of the spectrum. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 2, pp. 267–270, March–April, 2007.     

左右手系材料界面处全反射行为的特性

基于电磁场理论，推导了左右手系材料界面处发生全反射时的物理特性，分析了相位变化情况.提出利用左右手系材料构成周期性结构，观测全反射时介质中隐失波干涉的实验设想，并从理论上计算了干涉条纹的分布. 关键词： 左手材料 负折射率 全反射 隐失波     

20～6000 K温度范围内二氧化碳配分函数的计算

在20～6000 K温度范围内,通过乘积近似计算了二氧化碳及其同位素的总的配分函数.其中振动配分函数用谐振子近似,转动配分函数考虑了离心扭曲修正.20～6000 K温度范围被划分为五个小区间.在每一个小区间,计算的总的配分函数被拟合到一个温度T的四阶或五阶多项式,从而获得五个或六个拟合系数.通过这些拟合系数可以快速准确的获得分子在所研究温度范围内任意温度下的总配分函数.     

部分耗尽SOI MOSFET总剂量效应与偏置状态的关系

实验表明SOI MOSFET掩埋氧化层中的总剂量辐射效应与辐射过程中的偏置状态有关. 对诱发背沟道泄漏电流的陷阱电荷进行了研究. 建立一个数值模型来模拟不同偏置下陷进电荷的建立, 它包括辐射产生的载流子复合和俘获的过程. 模拟结果与实验结果相符, 解释了总剂量辐射效应受偏置状态影响的机理.     

Letter: Differential Invariants of the Kerr Vacuum

The norms associated with the gradients of the two non-differential invariants of the Kerr vacuum are examined. Whereas both locally single out the horizons, their global behavior is more interesting. Both reflect the background angular momentum as the volume of space allowing a timelike gradient decreases with increasing angular momentum becoming zero in the degenerate and naked cases. These results extend directly to the Kerr-Newman geometry.     

火焰曲率对H_2扩散火焰NO排放影响的数值研究

使用不同的H_2/O_2化学反应机理和NO_x化学反应机理模拟了平面对冲火焰。通过和实验数据比较确定了最优的化学反应机理。使用该化学反应机理模拟了管形对冲火焰。通过对比平面拉伸火焰和管形拉伸火焰,突出了火焰曲率对H_2扩散火焰温度和NO排放的影响。分析显示正曲率提高火焰温度,负曲率降低火焰温度,由于NO生成对温度的敏感性,正曲率火焰的NO排放明显高于平面火焰,反之,负曲率火焰的NO排放大大低于平面火焰。