偏置电场对聚对苯乙烯激发态弛豫特性的影响

为探讨洞悉电场对有机发光二极管电致荧光量子效率的影响,通过激发-探测超快光谱技术研究了激子在电场下的瞬态行为.与单重态激子相应的激发态在230 μJ/cm2激发强度下,显示了快慢两个弛豫过程. 快慢组分的权重因子及快组分弛豫时间常数是电场相关的, 在6.4×10⁵ V/cm的电场下,与无偏置电场相比,激子的快组分弛豫时间加速,快组分的权重因子由22%增加为72%,约50%的初始激子又通过电场而离解. 慢组分是电场无关的,其弛豫时间常数为890 ps. 实验结果还揭示了由激发光所产生的长程声学声子,其声速为17 /ps.     

Laser diode pumped actively Q-switched Nd:GdVO4 self-Raman laser operating at 1173 nm

A laser diode pumped actively Q-switched Nd:GdVO₄ self-Raman laser operating at 1173 nm is presented. The maximum output power was 2.26 W at an incident pump power of 18 W, with the corresponding optical conversion efficiency of 12.6%. Two different resonator configurations were investigated in order to achieve high output power and efficiency.     

超高强度激光脉冲压缩用衍射光栅

衍射光栅是超高强度激光脉冲压缩器的核心元件之一，其高衍射效率、高损伤阈值和大尺寸的苛刻要求是普通商业光栅所远远不能满足的，文章对高强度激光超短脉冲压缩用衍射光栅的基本要求、主要类型、研究现状进行了综述。     

A coupled system of ODEs and quasilinear hyperbolic PDEs arising in a multiscale blood flow model

We study a coupled system of ordinary differential equations and quasilinear hyperbolic partial differential equations that models a blood circulatory system in the human body. The mathematical system is a multiscale model in which a part of the system, where the flow can be regarded as Newtonian and homogeneous, and the vessels are long and large, is modeled by a set of hyperbolic PDEs in a one-spatial-dimensional network, and in the other part, where either vessels are too thin or the flow pattern is too complicated (such as in the heart), the flow is modeled as a lumped element by a set of ordinary differential equations as an analog of an electric circuit. The mathematical system consists of pairs of PDEs, one pair for each vessel, coupled at each junction through a system of ODEs. This model is a generalization of the widely studied models of arterial networks. We give a proof of the well-posedness of the initial-boundary value problem by showing that the classical solution exists, is unique, and depends continuously on initial, boundary and forcing functions and their derivatives.     

不同热处理的GeTe薄膜的光学参数测量

运用一种新的测量单面镀膜膜层光学参数的方法，对不同热处理的ＧｅＴｅ半导体薄膜样品的光学参数进行了测量，准确地获得了被测薄膜材料的光学参数，并采用椭圆偏振光谱测量作比较研究。经此为基础，对用椭偏仪测得的数据进行拟合计算，得出了样品材料在２５０～８３０ｎｍ波段范围的复折射曲线。     

ASYMPTOTIC DECAY TOWARD RAREFACTION WAVE FOR A HYPERBOLIC-ELLIPTIC COUPLED SYSTEM ON HALF SPACE

We consider the asymptotic behavior of solutions to a model of hyperbolicelliptic coupled system on the half-line R＋ = （0, ∞）,with the Dirichlet boundary condition u（0, t） = 0. S. Kawashima and Y. Tanaka [Kyushu J. Math., 58（2004）, 211-250] have shown that the solution to the corresponding Cauchy problem behaviors like rarefaction waves and obtained its convergence rate when u_ u＋. Our main concern in this paper is the boundary effect. In the case of null-Dirichlet boundary condition on u, asymptotic behavior of the solution （u, q） is proved to be rarefaction wave as t tends to infinity. Its convergence rate is also obtained by the standard L2-energy method and Ll-estimate. It decays much lower than that of the corresponding Cauchy problem.     

30-3000eV的正电子被O2、H2O及CH4散射的总截面计算

使用可加性规则，在Hartree-Fock水平上计算了30-3000eV的正电子被三个分子（O2、H2O及CH4）散射的总截面。计算正电子被三个分子散射的总截面时，首次使用了被束缚原子概念修正过的复光学势（这一复光学势考虑了分子中两个原子间的电子云重叠效应）。将正电子被这三个分子散射的总截面计算结果与实验结果及其它理论计算结果进行了比较，结果显示出在30-3000eV内，文中的计算结果与实验结果及其它理论计算结果具有较好的一致性。因此，可加性规则与修正后的复光学势相结合，完全适用于正电子被分子散射的总截面的计算。     

On the asymptotic number of non-equivalent q-ary linear codes

Let be the group of monomial matrices, i.e., the group generated by all permutation matrices and diagonal matrices in . The group acts on the set of all subspaces of . The number of orbits of this action, denoted by N_n,q, is the number of non-equivalent linear codes in . It was conjectured by Lax that as n→∞. We confirm this conjecture in this paper.     

共振频率附近的吸收曲线与色散曲线

本文利用经典电磁理论讨论了共振频率附近的吸收曲线和色散曲线的相对位置，并指出了文献[1]中的错误。     

HT-7托卡马克上低杂波电流驱动实验中的快电子动力学

在低杂波电流驱动实验中，快电子的动力学对等离子体的品质有至关重要的影响。HT-7托卡马克上，新近发展了一套硬X射线阵列诊断系统用于快电子的动力学研究。本文给出了在不同的低杂波电流驱动实验中，例如高参数，长脉冲，以及反向电流驱动实验，快电子的动力学行为。