High-power and high-efficiency operation of an all-solid-state, quasi-continuous-wave, titanium sapphire laser system

High-power and high-efficiency operation of an all-solid-state, quasi-continuous-wave, titanium sapphire laser is obtained with a diode-laser-pumped frequency-doubled Nd:YAG laser as the pump source. A maximum output power of 2.5 W is obtained for 16-W power of 532-nm pump light. A much higher conversion efficiency of 15.7% is obtained when at the maximum output power.     

乙烯-醋酸乙烯酯-乙烯醇三元共聚物性质的研究

以乙烯-醋酸乙烯酯共聚物（EVA）为原料，通过控制VA的水解程度制得一系列不同组成的乙烯-醋酸乙烯酯-乙烯醇三元共聚物．研究表明：随水解程度的增加共聚物的结晶性越来越好．在一定水解度范围内共聚物具有良好的综合力学性能，是一种新型的热塑性弹性体．     

Lattice Boltzmann Simulations of Particle-Particle Interaction in Steady Poiseuille Flow

The moving behaviour of two- and three-particles in a pressure-driven flow is studied by the lattice Boltzmann simulation in two dimensions. The time-dependent values, including particles＇ radial positions, translational velocities, angular velocities, and the x-directional distance between the particles are analysed extensively. The effect of flow Reynolds number on particle motion is also investigated numerically. The simulation results show that the leading particle equilibrium position is closer to the channel centre while the trailing particle equilibrium position is closer to the channel wall. If Reynolds number Re is less than 85.30, the larger flow Reynolds number results in the smaller x-directional equilibrium distance, otherwise the x-directional distance increases almost linearly with the increase of time and the particles separate finally. The simulation results are helpful to understand the particle-particle interaction in suspensions with swarms of particles.     

固体超强酸对合成辛基多苷的催化作用

SO2 -4 /ZrO2 固体超强酸用作合成辛基多苷 (OctylPolyglycosides)的催化剂 ,具有活性高、选择性好、易与产品分离、无污染、可重复利用等优点。文中主要讨论SO2 -4 /ZrO2 ,SO2 -4 /ZrO2 MoO3、SO2 -4 /ZrO2 Fe2 O3、以及SO2 -4 /ZrO2 SiO2 固体超强酸在合成辛基多苷反应中的不同催化活性。实验证明 :同一制备条件下的不同催化剂其活性不同 ,且SO2 -4 /ZrO2 的活性、选择性最好 ,可使葡萄糖的转化率高达 96%。     

High-power and high-efficiency operation of an all-solid-state,quasi-continuous-wave,titanium sapphire laser system

High-power and high-efficiency operation of an all-solid-state, quasi-continuous-wave, titanium sapphire laser is obtained with a diode-laser-pumped frequency-doubled Nd:YAG laser as the pump source. A maximum output power of 2.5 W is obtained for 16-W power of 532-nm pump light. A much higher conversion efficiency of 15.7% is obtained when at the maximum output power.     

共轭高分子材料荧光颜色的调节机理及方法

近年来,共轭高分子作为荧光材料的研究受到越来越多的关注。共轭高分子相对于小分子发光材料在材料加工和发光性能上均具有极大的优势,从而在生物成像、传感、编码和光电材料等方面均有良好的应用前景,而其发光颜色的调节在某些应用中是极为重要的。本文首先对共轭高分子荧光颜色调节的两大类机理进行了阐述:直接调节共轭聚合物发光体系的能隙以改变发光颜色,或者将具有不同荧光颜色的材料发出的光叠加获得新的表观颜色。我们还对具体的调节手段进行了初步分类,包括物理共混法、共聚法、改变聚合物主链或侧基结构,以及改变共轭高分子聚集态等方法;在列举具体调节手段同时还引入了共轭高分子体系的实例说明,并对其中调节荧光颜色的可能机理进行了探讨。     

共轭高分子荧光化学传感分子的设计原理与分子组装概念

共轭高分子作为"分子导线"所特有的信号放大效应,使其在构建高灵敏度的荧光化学传感体系中具有特别的优势。本文首先从分子识别、传感机理和信号输出等方面概述了传感分子设计中需要考虑的一些基本问题;然后以聚对芳撑乙炔类共轭高分子为例,提出基于模板排列组合的分子组装概念,并将之用于合成一系列结构可调的荧光化学传感分子,以满足不同的检测目的;最后通过文献中的具体实例,对多种聚对芳撑乙炔类共轭高分子进行了分子结构和传感应用方面的解析。     

初中数学课堂教学中的数学游戏应用研究

数学课程标准明确提出:课堂教学要充分调动学生学习的积极性,激发学生的学习兴趣,让学生充分参与到课堂教学活动中,发挥学生的主体性,让学生的创新能力得到进一步发展.传统的数学课堂教学给人的感觉是枯燥、乏味的,学生在课堂教学中缺乏主动性和探究性,不符合初中生身心发展规律.数学游戏的出现,将数学知识蕴含在游戏中,通过游戏的手段,让学生在游戏中体验数学知识的形成过程,使数学课堂教学变得更加生动、活泼,提高学生对数学知识的应用实践能力.     

Effect of Rolling Massage on Particle Moving Behaviour in Blood Vessels

The rolling massage manipulation is a classic Chinese massage, which is expected to eliminate many diseases. Here the effect of the rolling massage on the particle moving property in the blood vessels under the rolling massage manipulation is studied by the lattice Boltzmann simulation. The simulation results show that the particle moving behaviour depends on the rolling velocity, the distance between particle position and rolling position. The average values, including particle translational velocity and angular velocity, increase as the rolling velocity increases almost linearly. The result is helpful to understand the mechanism of the massage and develop the rolling techniques.