进口皮革涂饰剂的GC-MS分析

皮革制品质量的高低不仅仅取决于生革的质量,而且也取决于处理工艺的先进性.而工艺中使用的助剂的好坏直接影响到皮革的质量.2000年我们接到某厂家提出剖析进口皮革涂饰剂的要求.经过对照实验他们认为进口皮革涂饰剂干得快,亮度高,颜色正,用量少.而他们所仿制的产品,其性能指标基本上能达到进口的水平,唯一有差别的是干得慢,希望我们能找出问题所在.经过一系列工作,发现其差异是由皮革涂饰剂中有机溶剂所引起的.     

优良全息光折变存储材料-双掺铌酸锂晶体

我们生长与后处理了一系列双掺铌酸锂晶体,通过光折变存储性能的测试,在这些晶体中,我们发现了三种双掺晶体:LN:Fe,Mg;LN∶Fe,In;LN∶Fe,Zn,它们具有优良的光折变存储性能,即高衍射效率(高达60～80;)、快光折变响应(比LN∶Fe 晶体缩短了一个数量级)、和强抗光散射能力(比LN∶Fe提高近两个数量级).我们还系统地研究了光强阈值效应与全息写入的关系以及全息写入与入射光强的关系,发现在光强阈值附近耦合强度有一最大值,从而提出了最佳写入光强的概念.另外,全息光栅热固定研究还显示,双掺铌酸锂晶体比单掺Fe的铌酸锂晶体具有更优良的热固定性质:快固定时间、高固定效率、长固定寿命等.     

TWO PROBLEMS ABOUT COMPOSITION OPERATORS ON HARDY SPACE

In this paper, two problems about composition operator on Hardy space are considered. Firstly, a new estimation of the norm of a class of composition operators is given. Secondly, the cyclic behavior of the adjoint operator of a composition operator is discussed.     

扰动模糊命题逻辑的代数结构及其广义重言式性质

着眼于扰动模糊命题逻辑的代数结构,为研究二维扰动模糊命题逻辑最大子代数I2R及其广义重言式提供了一些代数理论基础,最后研究了子代数间广义重言式的关系.     

带有加压泵站的污水管网系统的优化计算

本对带有加压泵站污水管网系统的优化问题进行了研究，建立了优化计算的数学模型，根据模型提出了有效的优化方法编制了相应程序，最后通过实际案例计算，比较表明，效果令人满意。     

浅谈“反证法”的教学

反证法是数学中一种重要的证明方法,尽管我们过去比较重视反证法的教学,但起色不大。为了共同研究解决这一问题,下面把本人关于反证法教学的作法和想法谈出来与老师们磋商。注意提前奠基逐步完成按照新教学大纲的要求,初中学生从初三上学期《几何》第二册起开始学习用反证法证题。这对于数学基础与推理能力尚差的学生来讲确有难处,为了奠好这一教学难点的基础,教材巧妙地在初二《几何》第一册中安排了反证法的基本训练,例如在《几何》第一册第4页说明“两直线相交,只有一个交点”的道理的过程中,     

同成分掺镁铌酸锂晶体紫外光致吸收阈值效应的研究

研究了同成分掺镁铌酸锂晶体中的紫外光致吸收效应。通过对不同掺Mg浓度铌酸锂晶体的紫外光致吸收系数和双色存储灵敏度的测量,发现同成分掺镁铌酸锂晶体的紫外光致吸收效应具有Mg离子浓度阈值效应。只有当掺Mg摩尔分数大于3．0％时,从近紫外一直延伸到近红外波段的紫外光致吸收效应才显示出来。这一Mg离子浓度阈值效应进一步为双色存储灵敏度的测量结果所证实。该浓度阈值小于掺镁铌酸锂晶体抗光损伤效应的摩尔分数阈值4．6％。这种紫外光致吸收现象可能和掺镁铌酸锂晶体中反位铌NbLi浓度的急剧减少基本消失有关。     

Manipulation of Quantum Nonlocality of the Single-Photon Entangled State via Beam Splitter

Quantum nonlocality of the single-photon entangled state emerging from a beam splitter with arbitrary controlling parameters is investigated by means of the parity measurement. The condition of the maximal violation of the Bell-CHSH inequality is obtained for the single-photon entangled state. Under the condition of the small coherent intensity J(J=0.1) and the phase difference γαβ of the two coherent displacements being opposite to the internal phase shift φ of the beam splitter (γαβ=-φ), we find that the quantum nonlocality depends only on the reflection coefficient R of the beam splitter, while φ plays an important role for selecting γαβ. The strongest quantum nonlocality can be observed for a 50:50 beam splitter. If R deviates from the intermediate value 0.5, the quantum nonlocality decreases gradually, even vanishes. Our results provide a method to observe and manipulate the quantum nonlocality of the single-photon entangled state by adjusting the parameters of the coherent displacements and the beam splitter.     

高能核-核碰撞中靶裂区非几何效应的分析

本文在分析HELIOS协作组所提供的¹⁶O-A碰撞的横能量分布实验数据的基础上,指出在靶裂区考虑非几何效应的必要性,并在几何模型的框架下,把非几何效应等效地用参与碰撞核子数的涨落来描述.     

Entanglement Manipulation for a Two-Mode Squeezed Vacuum State

By numerically analysing the entropy of entanglement of the output state from a Mach-Zehnder interferometer for the two-mode squeezed vacuum state input, it is found that if the internal phase shift of the interferometer is adjusted to the value of 0 or 7r, the entangling characteristic of the input state is efficiently preserved at the output. If the internal phase shift is tuned to the value of Tr/2, the two-mode squeezed vacuum state is completely disentangled at the output of the setup. If the internal phase shift deviates from the above values, the input state is degraded into a partially entangled output state. Based on these results, a method for optically realizing the entanglement preservation, entanglement degradation, and disentanglement via the interferometer is obtained.