高台阶抛掷爆破速度规律的数值模拟

为了获得高台阶抛掷爆破作用下岩石的抛掷速度变化规律,结合现场实验,采用理论分析、高速摄影技术、数值计算方法开展研究。研究结果表明,炮孔内炸药起爆后,坡面岩石抛掷初速度达到最大值的时间在93~105 ms之间,最大抛掷初速度在18~28 m/s之间;坡面岩石的最大抛掷初速度在延炮孔内传爆方向呈增长、稳定、下降的趋势;岩石抛掷运动过程的最后阶段呈自由落体运动,个别岩块的运动速度存在增减现象,主要是由于岩体破碎后岩块间存在的相互碰撞作用;高速摄影实验结果验证了数值计算结果的正确性、RHT材料本构模型及参数在高台阶抛掷爆破数值计算过程中的可用性。     

Supermode analysis of seven-core photonic quasi-crystal fibers

We design custom-shaped modes for a sixfold symmetric photonic quasi-crystal fiber （PQF）, an optical fiber with a sixfold symmetric quasi-periodic array of air holes in the cladding region. The supermodes of the PQF are calculated by the finite element method, and the coupling of an in-phase supermode for the quasi-periodic optical fiber is numerically optimized to obtain identical values. The optimization is guaranteed by the selection of appropriate PQF design parameters. The eigenvalue equation associated with a seven-core PQF is derived from a coupled mode equation. We realize mode shaping and provide the far-field distribution mode of PQFs. The results are beneficial for the structural design and uniform distribution of the in-phase supermodes of PQFs.     

Relativistic symmetry of position-dependent mass particles in a Coulomb field including tensor interaction

The spatially-dependent mass Dirac equation is solved exactly for attractive scalar and repulsive vector Coulomb potentials,including a tensor interaction under the spin and pseudospin symmetric limits.Closed forms of the energy eigenvalue equation and wave functions are obtained for arbitrary spin-orbit quantum number κ.Some numerical results are also given,and the effect of tensor interaction on the bound states is presented.It is shown that tensor interaction removes the degeneracy between two states in the spin doublets.We also investigate the effects of the spatially-dependent mass on the bound states under spin symmetric limit conditions in the absence of tensor interaction.     

The spin-one Duffin Kemmer Petiau equation in the presence of pseudo-harmonic oscillatory ring-shaped potential

The Duffin-Kemmer-Petiau equation （DKP） is studied in the presence of a pseudo-harmonic oscillatory ring-shaped potential in （1 ＋ 3）-dimensional space-time for spin-one particles. The exact energy eigenvalues and the eigenfunctions are obtained using the Nikiforov-Uvarov method.     

高效垂直耦合的光栅耦合器设计

利用反射式光栅和分布布喇格反射镜的反射特性,分别从光栅耦合器的侧面和底部对光进行高反射,通过合理选取反射光栅和耦合光栅的间距使两组光栅的反射光实现相消干涉来减弱耦合光栅在实现垂直耦合时存在的负二阶反射,从而设计出高效率垂直耦合的光栅耦合器.采用本征模展开方法,模拟计算了垂直耦合光栅耦合器的耦合效率随不同结构参量而变化的相关特性,在绝缘体硅平面波导和单模光纤之间对波长1550 nm的光获得了最高89％的耦合效率.所得结果对实际垂直耦合光栅耦合器的制备具有一定参考价值.     

随机矩阵的本征值外推性质

外推近似方法在原子核壳模型上取得了一些成功,然而人们对于其原理知道得比较少。这里主要研究并讨论了随机两体系综和高斯正交系综最小本征值。利用截断空间的外推解释了高斯正交系综下的外推公式以及随机两体系综下本征值外推收敛的鲁棒性,即对于壳模型有效相互作用而言,用外推法预言最低本征值收敛性很好。Although the extrapolation method of diagonalizing the nuclear shell model Hamiltonian is successful, its foundation has not yet been understand very well. In this paper, we study this approach by using random matrices with the focus on gaussian ensemble and two-body random ensemble. We derive the formula of the extrapolation method of diagonalizing the matrices of Gaussian orthogonal ensemble, and discuss the robustness of the extrapolation property by two-body random ensemble. We point out that the extrapolation method of diagonalizing the shell model Hamiltonian works better with the realistic interaction than other interactions.     

光纤倏逝波吸收传感器灵敏度模拟分析

基于光波导模式理论,结合光纤倏逝波吸收原理,分析了本征型单模光纤倏逝波的传输特性及功率传输情况,导出了光纤倏逝波吸收传感器的灵敏度公式。结合灵敏度公式分析了传感器的几何参数、溶液折射率及入射波长与灵敏度的关系,运用时域有限光束传播法（FD BMP）进行模拟。模拟结果表明,光纤传感区纤芯越长越细,外界溶液折射率越小,入射波长越短,其归一化输出功率越小,传感器灵敏度越高,这与理论计算和文献实验结果一致,为光纤倏逝波吸收传感器的研究提供了参考。     

宽带大动态射频前端的设计与实现

介绍了1GHz~2GHz宽带大动态射频前端的设计和实现.大动态射频前端采用二次变频方案,实现了低噪声、大动态输出.通过合理的频率和电平配置,减小了混频非线性导致的组合干扰,降低了输出杂散、本振反向辐射.对中镜频信号有良好的抑制.可广泛的应用于侦察接收机和测向接收机.     

数字域校正零中频发射机镜频干扰和载漏的方法研究

考虑到零中频发射机存在的镜频干扰和本振泄露会产生带内干扰,分析了同相正交信号(IQ) 的非理想特性,给出了易于硬件实现的校正方法。当输出射频信号开环时,提出在数字域中建立查找表和校正IQ不平衡的操作方法;当射频信号闭环时,提出自适应补偿的基本方法和环路时延估计,并给出了仿真方法。最后,通过运用开环校正物理实现验证,残留镜像和载漏信号均比有效边带信号低40dB以上,提高了信噪比。     

如何提升宁东运营部安全生产管理

本文针对宁东运营部现行的安全生产管理制度入手,反思其中导致出现运营事故的弊端所在,探讨如何从安全生产管理制度、强化管理环节、完善监控措施入手来全方位的提升运营部的生产安全,从而建立一套合理系统的安全管理体系。