三明站扩能改造方案探讨

1 车站概况 三明站为鹰厦线上有解编作业的一等中间站,北距三明东站6.785km,南距荆西站9.556km.其主要运输设施、设备配备情况如下:     

矢量孤波在综合管理的双折射光纤系统中的传输

以变系数的耦合非线性薛定谔方程作为光脉冲传输的理论模型,考虑了三阶色散、自频移效应、自陡峭效应和五阶非线性效应,采用对称分步傅里叶方法,数值模拟了矢量组合孤波在综合管理的双折射光纤中的传输,研究了矢量组合孤波中相邻孤子间的相互作用,并且讨论了在加入噪声干扰、功率微扰和相位微扰情况下矢量组合孤波的传输稳定性。模拟结果显示:在一定条件下,矢量组合孤波中相邻两孤子几乎不发生相互作用,能够无畸变传输;并且在有限干扰情况下,矢量组合孤波具有良好的传输稳定性和抗干扰性。     

平方反比有心力系统的统一的Runge-Lenz矢量

本文给出平方反比有心力系统的Runge-Lenz矢量的统一的表达形式,给出了其守恒性的统一的数学证明;尤其是推导出该矢量的一种新的张量表达形式;罗列并证明了该矢量的一些性质,并基于该守恒矢量讨论了质点作各类开普勒运动的判据.     

Design on a highly birefringent and nonlinear photonic crystal fiber in the C waveband

In this paper, a novel photonic crystal fiber （PCF） with high birefringence and nonlinearity is designed. The charac- teristics of birefringence, dispersion and nonlinearity are studied by using the full-vector finite element method （FVFEM）. The numerical results show that the phase birefringence and nonlinear coefficient of PCF can be up to 4.51× 10-3 and 32.8972 w-l.km-1 at 1.55 μm, respectively. The proposed PCF could be found to have important applications in the polarization-dependent nonlinear optics such as the pulse compress and reshaping in the C waveband.     

Scattering of particles in wave beam based on series expansion

Based on the orthogonalities of the vector wave functions, the expressions of scattering fields are developed as the particle in the zero order field and in the first order fields of x, y, and z, respectively. A general relation between the expansion coefficients of scattering field and incident field is presented. Taking the elliptical beam for example, the scattering property of a particle in beam is investigated. After analyzing the effects of the beam waist, irradiating distance, etc. on scattering property, the validity of the proposed algorithm is demonstrated. Results show that the beam waist may improve the particle identification property and the particle has a strong scattering both in the forward direction and in the backward direction. The method proposed is simple and is a new way of researching the scattering from particles in electromagnetic beams.     

Searching for new physics in D^0→μ^＋ μ^-,e^＋e^-,μ^±e at BES and/or the super charm-tau factory

In contrast with B0-ˉB0, Bs-ˉBs mixing where the standard model（SM） contributions overwhelm that of the new physics beyond standard model（BSM）, a measured relatively large D0-ˉD0mixing where the SM contribution is negligible, definitely implies the existence of the new physics BSM. It is natural to consider that the rare decays of D meson might be more sensitive to new physics, and the decay mode D0→μ＋μ-could be an ideal area to search for new physics because it is a flavor changing process. In this work we look for a trace of the new physics BSM in the leptonic decays of D0. Concretely we discuss the contributions of unparticle or an extra gauge boson Z while imposing the constraints set by fitting the D0-ˉD0mixing data. We find that the long-distance SM effects for D0→lˉl still exceed those contributions of the BSM under consideration, but for a double-flavor changing process such as D0→μ±e, the new physics contribution would be significant.     

Mixed symmetry states and electromagnetic transition in the N=Z nucleus ^28Si

The interacting boson model with isospin （IBM-3） has been used to study mixed symmetry states and electromagnetic transitions at low-lying states for a ^28Si nucleus. The theoretical calculations show that the 24^＋ state is the lowest mixed symmetry state in ^28Si and the 43＋ state is also a mixed symmetry state.     

物理所氧化亚铜新能源材料研究获进展

<正>氧化亚铜(Cu2O)是一种性能优异的半导体材料,它具有2.1 e V(590 nm)的直接帯隙以及很高的可见光吸收系数,再加上它具有无毒、低价、原料丰富等优点,已成为太阳能转化与利用研究领域的重要材料。理论预计基于Cu2O的太阳能电池效率可达20%,通过掺杂引入合适的中间带(intermediate band)后,其光电     

基于强度图像和地物偏振反射率数据的光学遥感偏振成像仿真分析

为获得满足偏振成像探测器的研制所需的偏振成像样本,并解决现有偏振遥感仿真分析中普遍缺乏实测数据支持的问题,提出了一种基于强度图像和实测地物偏振反射率数据的偏振成像仿真方法,介绍了其实现过程,并且得到了不同大气几何条件下的卫星高度偏振仿真图像。通过与强度仿真图像定量的对比表明,偏振成像对比度受大气能见度的影响较弱,在低能见度及后向散射条件下或者某些特定方向上优势更为突出。偏振成像的清晰度对观测方向较为敏感这一属性可以指导选择特定的方向进行偏振探测,并最终提升雾霾条件下偏振成像对地遥感的目标识别能力。     

碰撞能对反应Sr+CH_3I→SrI+CH_3的立体动力学影响

采用准经典轨线方法,基于半经验的London-Eyring-Polanyi-Sato势能面,研究了碰撞能对碰撞反应Sr+CH3I→SrI+CH3的立体动力学性质的影响.结果表明,反应物的初始碰撞能对产物转动角动量矢量的取向和定向程度都有重大影响.