Hydrogen storage capabilities of the most stable isomers of NanBm (m+n=6) clusters

The most stable isomers of NanBm(m+n=6) clusters and their hydrogen storage properties are investigated by means of density functional theory with a 6-311+G(d) basis set. To study the hydrogen storage properties,all of the stable structures of Na n BmHx (m+n=6) clusters have been optimized. It shows that boron atoms of Na n B m are separated from the other boron atoms,and form satellite BHx (x=3,4) clusters around the centre,which attach to the system by a bridging bond of a hydrogen atom or an Na atom. Compared with the hydrogen storage capabilities,the Na3B3 has the highest hydrogen storage capacity among Na n B m clusters. The binding energies,interaction energies of hydrogen atom with Na n B m clusters and second difference in energy of Na3B3Hx clusters have been calculated. The results show that the stability of the Na n B m H x clusters present an odd-even oscillatory effect,as the number of H atoms increases.     

纳米流体传质扩散系数的测定

本文建立光学实验测试系统,测量了不同温度条件下罗丹明B在不同粒子体积份额的纳米流体(Cu-乙二醇和Cu-水)中的质扩散系数。实验结果表明;罗丹明B在纳米流体中的扩散系数大于其在基液中的扩散系数,且扩散系数随着粒子体积份额的增大而增大;当粒子体积份额一定时,扩散系数随着温度的升高而增大。     

频率啁啾脉冲下里德堡锂原子量子态布局跃迁

采用含时多态展开方法（TDMA）,结合B样条技术,计算了频率啁啾脉冲激光场中里德堡锂原子五个量子态之间的跃迁情况,并分析了激光场的四个主要参数对跃迁的影响。结果表明当取合适的激光参数时,可以实现布居数在量子态间的有效跃迁,从而一定程度上可以实现量子态的人工控制.     

关于B0→π-l+～vl衰变过程分支比的计算

通过构造适当的关联函数,计算B→π跃迁形状因子f+Bπ(q2),～fBπ(q2)和标量形状因子f0(q2),从而就能研究轻子质量对B0→π-l+～vl(l=e,μ,τ)衰变过程的影响.首次分别计算B0→π-e+～ve,B0→π-μ+～vμ,B0→π-τ+～vτ衰变过程的分支比,并发现轻子质量me,mμ可以忽略,但重轻子质量mτ不能忽略,它对分支比计算有一定的贡献.把计算结果与最近的实验数据进行比较,发现理论结果与实验数据基本符合.     

B值随机元序列加权和的强收敛性

本文研究了B值随机元序列加权和的强收敛性.利用Banach空间的几何性质(p型或p阶光滑),在较弱的条件下得到了B值随机元序列加权和的强大数律,这些结果推广和改进了已知的一些文献中相应的结论.     

The Global Existence of Small Solutions to the Oldroyd-B Model

The Cauchy problem to the Oldroyd-B model is studied. In particular, it is shown that if the smooth solution (u, τ) to this system blows up at a finite time T*, then ∫₀ ^T* ‖▿u(t)‖ _L ^∞dt = ∞. Furthermore, the global existence of smooth solution to this system is given with small initial data.     

THE ANALYSIS OF SHALLOW SHELLS BASED ON MULTIVARIABLE WAVELET FINITE ELEMENT METHOD

Based on the generalized variational principle and B-spline wavelet on the interval (BSWI), the multivariable BSWI elements with two kinds of variables (TBSWI) for hyperboloidal shell and open cylindrical shell are constructed in this paper. Different from the traditional method, the present one treats the generalized displacement and stress as independent variables. So differentiation and integration are avoided in calculating generalized stress and thus the precision is improved. Furthermore, compared with commonly used Daubechies wavelet, BSWI has explicit expression and excellent approximation property and thus further guarantee satisfactory results. Finally, the effciency of the constructed multivariable shell elements is validated through several numerical examples.     

地磁信息感应装定系统及其插值算法

为了向基于地磁场的弹体姿态角检测系统提供地磁场信息,根据地磁信息感应装定系统的工作原理,设计了基于GPS和ARM微处理器的地磁信息感应装定系统,GPS实时获取弹药发射地的地理位置信息,ARM微处理结合地磁场沿经线方向变化快和沿纬线方向变化慢的特点,采用线性周期样条组合插值算法计算地磁场强度矢量,然后以非接触电磁感应的方式装定地磁场强度矢量信息。插值分析表明,通过线性周期样条组合插值算法,地磁场总强度和水平分量的相对误差小于0.01%,磁偏角和磁倾角误差小于0.01o,并且实验结果与仿真计算一致,说明地磁信息感应装定系统能够快速准确地提供地磁场强度矢量信息。     

Cubic algebraic spline curves design

In this paper we propose a construction method of the planar cubic algebraic spline curve with endpoint interpolation conditions and a specific analysis of its properties. The piecewise cubic algebraic curve has G ² continuous contact with the control polygon at two endpoints and is G ² continuous between each segments of itself. The process of this method is simple and clear, and provides a new way of thinking to design implicit curves.     

B值随机元阵列加权和的完全收敛性

在随机元阵列随机有界的条件下,得到了行间独立B值随机元阵列加权和的完全收敛性成立的充分条件,延伸了文献[9]的主要结果和文献[6]的部分结果.