θ(t)-Caldern-Zygmund算子在群上的Hardy空间H~p(G)中的有界性

设Ｇ为局部域Ｋ上的２ｎ＋１维Ｈｅｉｓｅｎｂｅｒｇ群,文献［１］给出了一类Ｈａｒｄｙ空间 Ｈ~ｐ（Ｇ）,（０＜Ｐ≤１）,本文讨论了θ（ｔ）－Ｃａｌｄｅｒｏｎ－Ｚｙｇｍｕｎｄ算子在Ｈ~ｐ（Ｇ）（０＜Ｐ≤１）中的有界性。     

刀具问题的仿真及灵敏度分析

本文通过计算机模拟仿真 ,搜索到了 CMCM-99A题中换刀间隔与检查间隔的近似最优解及单位正品最小费用 ,并对 p1(好刀生产正品的概率 ) ,p2 (坏刀生产正品的概率 ) ,k,f,d进行了灵敏度分析 ,得出 u(换刀间隔 )是最重要的优化参数的结论     

全光纤量子保密通信中的偏振控制

介绍了在全光纤量子保密通信系统的量子信道中利用可转动光纤圈型偏振控制器实现对光纤偏振态的测量和调整.实验证明该方法能有效控制光纤中的偏振态.     

Generalized Toda Mechanics Associated with Loop Algebras (L)(Cr) and (L)(Dr) and Their Reductions

We construct a class of integrable generalization of Toda mechanics with long-range interactions. These systems are associated with the loop algebras L(C_r) and L(D_r) in the sense that their Lax matrices can be realized in terms of the c=0 representations of the affine Lie algebras C⁽¹⁾_r and D⁽¹⁾_r and the interactions pattern involved bears the typical characters of the corresponding root systems. We present the equations of motion and the Hamiltonian structure. These generalized systems can be identified unambiguously by specifying the underlying loop algebra together with an ordered pair of integers (n,m). It turns out that different systems associated with the same underlying loop algebra but with different pairs of integers (n₁,m₁) and (n₂,m₂) with n₂<n₁ and m₂<m₁ can be related by a nested Hamiltonian reduction procedure. For all nontrivial generalizations, the extra coordinates besides the standard Toda variables are Poisson non-commute, and when either $n$ or m≥3, the Poisson structure for the extra coordinate variables becomes some Lie algebra (i.e. the extra variables appear linearly on the right-hand side of the Poisson brackets). In the quantum case, such generalizations will become systems with noncommutative variables without spoiling the integrability.     

New Exact Solutions for a Class of Nonlinear Coupled Differential Equations

More new exact solutions for a class of nonlinear coupled differential equations are obtained by using a direct and efficient hyperbola function transform method based on the idea of the extended homogeneous balance method.     

Tuning for the first 9-cell TESLA cavity of PKU

A method based on circuit model is used to tune the first home-made 9-cell TESLA type superconducting niobium cavity at Peking University.After tuning,a flat field profile with a final π-mode frequency within 3 kHz of target frequency is achieved.The field flatness is measured by a bead-pull method,and the relative electric field is calculated from the frequency shift perturbed by the bead stepping along the axis of the cavity.     

Langmuir双探针诊断Ne辉光放电管电子密度

应用Langmuir双探针诊断理论,对充有氖气的石英放电管中的辉光放电等离子体进行了诊断,通过实验测得伏安特性曲线,计算得出电子温度和电子密度,讨论了等离子体的宏观参量与电子温度和电子密度的关系.采用直径为0.1 mm的探针对等离子体进行诊断,不仅减小了对所测等离子体区域的扰动,而且减小了读取伏安特性曲线所带来的误差.     

Top pair production in the littlest Higgs model with T-parity

In the framework of the littlest Higgs model with T-parity,we study the top pair production at the next generation colliders like LHC and ILC.We find that the order O(αs) corrections to the standard model top pair production cross section at LHC can be very small and the magnitude is below 1%.However,the magnitude of corrections to the standard model top pair production rate at ILC may be over 5% for reasonable values'of the parameters.Besides this,the corrections to the asymmetry ALR(tt) may be more sizable. Therefore,the top pair production at ILC may serve as a probe of the littlest Higgs model with T-parity,especially the asymmetry ALR(tt).     

霍尔效应实验的改进和扩展

对霍尔效应仪器进行了改进,通过对磁场标定,研究霍尔电压与恒定电流的关系,可以测定霍尔片载流子的浓度. 测量霍尔片的长度和横截面积,进而可以测定霍尔片的电导率和迁移率.