BEPC同步辐射专用模式横向耦合测量及补偿

对北京正负电子对撞机(BEPC)同步辐射专用模式下的横向二阶差共振耦合做了研究.应用二阶差共振微扰理论,首先测量了BEPC同步辐射专用模式的耦合系数,然后通过数值分析和程序模拟找出耦合来源,最后通过引入斜四极子,成功地对横向耦合进行了补偿.     

Kinetic parameters of decomposition of some selenites

Studying the kinetics of isothermal decomposition of thirteen selenites at isothermal heating, the values of activation energy E of the process, pre-exponential factor A in Arrhenius equation and changes of entropy for the formation of the activated complex of the reagent were calculated. Direct dependence between the thermal stability of the selenites and their cation radii on their 'hardness' or 'softness' was found. The dependence was interpreted in the terms of the generalized perturbation theory of chemical reactivity. Kinetic compensation effect was observed only for the selenites, which thermally decompose by the same mechanism.     

特殊光学零件的加工方法──浇注刚性补偿法

厚度相差很大的光学零件，加工时应力容易集中到最薄的地方，对零件的加工存在着很大困难，针对所加工零件的特点选择正确的加工方案至关重要。采用浇注刚性补偿法加工中心厚度与边缘厚度比值为２．７：１３，且不对称的特殊光学零件，取得了较好的效果。     

Group delay and dispersion analysis of compound high order microring resonator all-pass filter

In this paper, we propose a novel compound high order microring resonator all-pass filter employing two cascaded microrings and an assistant microring. It improves the dispersion compensation ability and provides a wide bandwidth. The group delay range is effectively extended, which provides flexibility in choosing the geometrical parameters of the microring for technical convenience and bend loss improvement. The careful design of coupling coefficients can optimize the group delay response. This device is able to provide dispersion compensation to systems such as the high speed dense wavelength division multiplexer (DWDM) optical fiber links.     

一种单斜坡积分型A／D转换器

介绍了一种单斜坡积分型模／数转换器的设计原理及关键技术。提出了输入对管匹配和非匹配失调设计技术，从电路、版图和工艺上进行优化设计。采用铝栅工艺研制的ＳＡＤ４４４７六通道模／数转换器在５Ｖ、１０Ｖ、１５Ｖ三种电源下工作，转换线性度＜０．３％，电路在－５５～１２５°Ｃ环境温度下能可靠地工作     

斯托克斯束的时空分布

基于在自由空间光束的分丰是已知的条件下，推导出适用于任意束分布的广义化的耦合波方程并得到一种计算受激拉曼散射过程中泵浦束与斯托克斯束的时、空分布的简单方法。所得结果清楚地示明受激拉曼散射过程既能使斯托克斯信号得到放大，又能使脉宽受到压缩。     

热透镜对铜蒸气激光振荡器与放大器输出光的影响

用几何光学传输矩阵方法和讨论了热透镜对铜蒸气激光非稳腔振荡器和放大器输出特性的影响，获得了与实验相符的计算结果，并提出了在振荡－放大链内热透效应的补偿方法。     

最大似然法测向中的互耦补偿

本文分析了自适应圆阵中阵元间互耦导致最大似然法测向性能下降的机制，提出了一种互耦补偿方法，该方法简便易行，补偿效果良好。     

A Tabu Search with Slope Scaling for the Multicommodity Capacitated Location Problem with Balancing Requirements

In this paper, a tabu search heuristic is combined with slope scaling to solve a discrete depot location problem, known as the multicommodity location problem with balancing requirements. Although the uncapacitated version of this problem has already been addressed in the literature, this is not the case for the more challenging capacitated version, where each depot has a fixed and finite capacity. The slope scaling approach is used during the initialization phase to provide the tabu search with good starting solutions. Numerical results are reported on various types of large-scale randomly generated instances. The quality of the heuristic is assessed by comparing the solutions obtained with those of a commercial mixed-integer programming code.     

中心下陷的负色散光纤

利用非等温等离子体化学气相沉积成功制得了具有折射率中心下陷的负色散光纤 (RDF)。该光纤在保持较好的抗弯曲性能与偏振模色散的同时 ,有效面积达到 4 5 μm2 ,且在 15 5 0nm处的色散为 - 19.6 5ps/(nm·km) ,色散斜率为 - 0 .132ps/(nm2 ·km)。此外 ,通过优化光纤纤芯各层的掺杂原子浓度 ,在 15 30nm处光纤的氢损降到了0 .0 1dB/km。由负色散光纤与具有超大有效面积的非零色散位移光纤 (ULAF)组成的色散管理光纤对在 15 30nm到16 2 5nm波长范围内的色散斜率小于 0 .0 0 6ps/(nm2 ·km) ,且最大色散值小于 0 .2ps/(nm·km)。同时 ,15 5 0nm波长处的衰耗为 0 .2 2 4dB/km ,且在 15 30nm到 16 2 5nm波段范围内衰耗较为平坦。该色散管理光纤对可以在无需色散补偿模块的前提下应用于大容量高速率的长距离波分复用 (WDM)系统。