Rheological Behavior for Mica-filled Polypropylene Composite Melts

The study on rheological properties of a series of mica-filled polypropylene (PP) composites was carried out. The influence of surface-treatment of mica particles on dynamic rheological behavior of the composites were dealt with. The viscosity (η) and dynamic modulus ( G‘ ) of the composite melts were higher than those of PP matrix, especially those for systems treated with silane, which was attributed to the interfacial adhesion enhancement. However, surface-treatment of mica by titanate resulted in lower η and G‘, as compared with the treatment by silane. The reason for this is believed to be the formation of the mono-molecular layer on the mica surface.     

Selective detection of Fe(III) ions in aqueous solution with a 1,8-diacridylnaphthalene-derived fluorosensor

The syn-isomer of 1,8-bis(4,4′-diisopropyl-9,9′-diacridyl)naphthalene, 1, has been prepared by two consecutive Pd(PPh₃)₄-catalyzed Stille cross-coupling steps. This highly congested sensor undergoes Fe(III)-selective fluorescence quenching in water/acetonitrile even in the presence of excess of other metal ions.     

Analysis of impact-excited HeI states by applying magnetic and electric depolarization techniques

The magnetic depolarization of the impact radiation at λ(4¹ D?2¹ P)=492 nm and λ(3¹ D?2¹ P) = 668 nm as well as the splitting of the magnetic depolarisation signals in electric fields were investigated for 10–25 keV H ₂ ⁺ (D ₂ ⁺ )-He collisions (only 492 nm line) and for 5-22.5 keV He-He collisions (both lines). The results are compared with analogous measurements for He⁺- He and Ne⁺ - He collisions and the dynamics of the excitation process are qualitatively discussed. In particular, we emphasize the importance of inertia for the evolution of the electron cloud during the final phase of the collision process.     

激光窗口热效应和应力双折射的分析

 分析了平板窗口在激光加热和内外压强差作用下对光束带来的附加相移，详细讨论了应力双折射部分的相移，计算了CaF₂窗口的温升、应力、附加相移、远场Strehl比和退偏度等的分布。结果表明：窗口变形和折射率随温度变化是产生附加相移的主要原因，窗口的非均匀温升将导致光束质量下降，应力双折射部分的相移与窗口表面Miller指数有关，对入射光产生一定的退偏效应，从而影响光束质量。     

带有对称啁啾光纤光栅的Sagnac环滤波器

通过在光纤Sagnac环中引入对称啁啾光纤光栅,对带有光纤光栅的Sagnac环梳状滤波器进行了改进,克服了原有滤波器工作带宽小、通带间隔不等的缺点.通过对光栅参量进行适当设计,在中等折射率调制度下,可使光栅同时具有高反射率和大反射带宽,结合Sagnac环可得到大带宽、等间隔梳状滤波器.     

分块镜扇形子镜驱动点位置优化计算

在光学综合孔径共相位检测微调系统中,分块镜子镜三自由度微动调节机构通常采用3个并联的微位移致动器来驱动各子镜,使单个分块镜具有独立的姿态调整能力,从而实现了光学共相位误差的纳米级精确校正。以理论力学原理作为切入点展开了分析,针对微动机构的稳定性、tilt-tip调节灵敏度等,根据所给定几何参数的子镜三驱动点位置对其进行了优化计算。经数学建模和仿真计算,得到了定参数子镜的三驱动点最佳位置坐标,进而归纳出了普遍适用的优化评价方法。     

Correspondence Between Oscillations and Emitted Photon Closed-Orbits in Spontaneous Emission Rate of an Atom Near a Dielectric Slab

We study the oscillations in the spontaneous emission rate of an atom near a dielectric slab. The emission rate is calculated as a function of system size using quantum electrodynamics. It exhibits multi-periodic oscillations. Four frequencies of the oscillations are extracted by Fourier transforms. They agree with actions of photon closed-orbits going away and returning to the atom. These oscillations are explained as manifestations of quantum interference effects between the emitted photon wave near the atom and the returning photon waves travelling along various closed-orbits.     

中国农民收入水平、受教育程度及其社会地位的实证研究

“三农”问题是我国相当长阶段内的社会问题,而所有的问题中最突出的是人的问题,即农民问题。本文主要通过四个部分对中国农民的收入水平、受教育程度及其社会地位进行了实证研究。在找出各种影响因素之后,通过建立经济学模型深入研究各个因素对农民收入水平、受教育程度的贡献大小,进而分析了农民社会地位的影响因素,最后对所得结论逐一分析探讨,提出了解决农民问题的一些途径。