Y3Al5O12：Eu^3＋磷光体的溶胶—凝胶法合成及发光特性

以金属烷氧基化合物为原料．采用溶胶-凝胶法在1000℃下合成了Eu^3 掺杂的Y3Al5O12(YAG)磷光体。利用TG-DSC，XRD和发光光谱等对样品进行了表征。结果表明，YAG：Eu^3 的晶相形成温度为991℃。Eu^3 在非晶态和晶态YAG中的发射光谱有明显差异。研究了Eu^3 含量和烧结温度对Eu^3 的^5D0→^7F1和^5D0→^7F2发射峰强度的影响。随煅烧温度的升高和Eu^3 浓度的增加，Eu^3 发射峰强度增强。     

Δ—scaling and Information Entropy in Ultra—Relativistic Nucleus—Nucleus Collisions

The Δ-scaling method has been applied to ultra-relativistic p p,C C and Pb Pb collision data simulated using a high-energy Monte Carlo package,LUCIAE 3.0.The Δ-scaling is found to be valid for some physical variables,such as charged particle multiplicity,strange particle multiplicity and number of binary nucleon-nucleon-nucleon collisions from these simulated nucleus-nucleus collisions over an extended energy ranging from E1ab=20 to 200A GeV.In addition we derive the information entropy from the multiplicity distribution as a function of beam energy for these collisions.     

An Electro—Optical Modulator Based on GeO2—Doped Silica Ridge Waveguides with Thermal Poling

A Mach-Zehnder electro-optic modulator is designed and fabricated based on upper-clad GeO2-doped silica ridge waveguides with thermal poling.The electro-optic coefficient obtained is about 0.05pm/V and is polarizationinsensitive.An extinction ratio of over 17dB is achieved.The transmission loss of the modulator for the TE mode is 2-3dB higher than that for the TM mode after the poling.     

Smooth Transition from Shakura—Sunyaev Disc to Advection—Dominated Accretion Flow

We solve a set of basic equations describing black hole accretion flows using the standard Runge-kutta method and a bridging formula for the radiative cooling,and show that a smooth transition from a shakura-Sunyaev disc to an advection-dominated accretion flow is realizable for the high-viscosity case,without the need of involving any extra mechanism of energy transport.     

变系数(2+1)维Broer-Kaup方程的精确解

利用齐次平衡原则,导出了变系数(2+1)维Broer-Kaup方程的B?cklund变换(BT),并由该BT,求出了(2+1)维Broer-Kaup方程的各种形式的精确解.     

几种常见光源特性的研究

本通过大学物理实验中常用光源特性的分析，说明了实验中光源使用的合理性。     

利用LNG冷(火用)的准零CO2排放循环探析

本文研究利用LNG冷(火用)来完善燃用它的热机性能,既提高了效率,又能回收用LNG燃料热机的唯一主要排放-CO2.这种系统的温度区间横跨大气温度,会有很多新的特点值得探索.作为前期研究,本文建议了两种新循环,分别基于Brayton循环与超临界Rankine循环,且分别适用于LNG超临界及亚临界汽化过程.文中对此两种循环进行了分析计算与讨论,说明建议是可行的,热机效率可达60%以上,且同时基本回收所有燃烧产生的CO2.     

热塑料板膜工艺与热塑料教具

热塑料板膜工艺是用热成型方法制作单件塑料教具和塑料配件的一种技术，它为无塑料制品生产能力的大、中院校物理、化学、生物实验室在研制教学仪器或做仿真制品时提供可行的石膏——锡模方法．教师采用该工艺，可在无现成模具和无注塑设备的条件下生产塑料教具，并可为计算机虚拟教学，提供实体模型．     

飞秒激光脉冲的谐波频率分辨光学开关法测量研究

建立了一台谐波频率分辨光学开关法(FROG)飞秒脉冲测量装置，利用该装置进行了掺钛蓝宝石飞秒激光脉冲的测量研究.在二次谐波自相关测得的时域和频域信号基础上，结合对信号光强度分布的计算机迭代处理，得到了有关飞秒激光电场、光谱及其相位的信息，所得脉宽与干涉测量的结果基本一致. 关键词： 频率分辨光学开关法(FROG) 迭代计算 飞秒激光 自相关