全氟聚甲乙醚的19F核磁共振波谱的研究

本文通过56.4MHz¹⁹F的核磁共振波谱对全氟聚甲乙醚的结构进行了初步研究。根据谱图上所出现的21条共振吸收峰,基本上确定了各峰的归宿。并在仪器分辨率所能达到的情况下,分别归纳出全氟聚甲乙醚不同单元组的序列分布,同时对聚合物链的未端结构也进行了探讨。     

Finite-size scaling and the renormalization group

Renormalization group calculations ind = 4 andd = 4 – are performed for a system of finite size. A form of mean-field theory is used which yields a rounded transition for a finite system, and this allows a sensible expansion in fluctuations. A combination of Ewald and Poisson sum techniques is used to produce explicit numerical results for the specific heat ind = 4 which, with the setting of two nonuniversal metrical factors and the fourth-order coupling constant may be compared with simulations. The numerical visibility of logarithmic corrections is investigated. The universal scaling function for the specific heat to relativeO() is also evaluated numerically.     

直线加速器同轴负载材料FeSiAl的电磁参数测试及仿真

 为获得直线加速器同轴负载材料FeSiAl的介电常数和磁导率,基于同轴传输反射法,利用矢量网络分析仪,对同轴负载磁性吸波材料FeSiAl的电磁参数进行了测试研究,同时利用电磁场分析软件Microwave Studio进行了测试仿真。研究表明,测量中加工样品与其夹具之间的装配间隙对电磁参数的测试值存在较大影响,进而制作了不同配比的FeSiAl微粉和固体石蜡混合样品,获得混合样品的稳定测试值。对求取电磁参数等效公式的适用性研究表明,Bruggeman,Looyenga,QCACP公式适用于描述该FeSiAl微粉的电磁特性,最后给出了FeSiAl材料的电磁参数。     

Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment

A γ/hadron separation analysis is described for the observed air shower events with primary energy above 100 TeV based on the Tibet AST detector configuration. The shower age and size parameters are fitted from the measured lateral density distribution and used as discrimination variables. According to the MC simulation while taking into account the systematic uncertainty estimated from data and MC comparison,it is found that 70% of the cosmic ray (CR) background can be rejected while more than 78% of the γ-rays can be retained. Sensitivity for 100 TeV γ-rays observation can thus be improved by at least 40%.     

Spatial anisotropy: a method to study anisotropic flow in heavy ion collisions

We introduce a method to study anisotropic flow parameter v<,n> as a collective probe to Quark Gluon Plasma in relativistic heavy ion collisions. The emphasis is put on the use of the Fourier expansion of initial spatial azimuthal distributions of participant nucleons in the overlapped region. The coefficients ε<,n> of Fourier expansion are called the spatial anisotropy parameter for the n-th harmonic. We propose that collective dynamics can be studied by v<,n>/ε<,n>. In this paper, we will discuss in particular the second (n=2) and the fourth (n=4) harmonics.     

基于典型工况的半导体制冷系统优化方式探讨

半导体制冷的特殊性,使制冷优化探讨对其工程应用具有重要指导意义.文中阐述了作为制冷片工作参数优化依据的最大效率E、等增量I、等功率P、综合最佳S、最大制冷量Q和最大温差T六种典型制冷工况.工况对比分析指出,温差亦是影响制冷性能的重要因素.在讨论各工况应用场合和制冷片损坏机理的基础上.探讨了温差优化和供电与控制方式优化措...     

辉光放电聚合物结构及力学性质研究

采用低压等离子体聚合技术,通过调整工作气压和反式二丁烯(T₂B)与H₂流量比制备了辉光放电聚合物(GDP)涂层. 利用傅里叶变换红外吸收光谱和元素分析法讨论了工作气压和T₂B与H₂流量比对GDP涂层内部H原子含量及结构的影响,并且通过纳米压痕技术对GDP涂层的硬度及杨氏模量进行了表征.研究结果表明:降低工作气压和T₂B与H₂流量比,GDP涂层内sp³ C 关键词： 傅里叶变换红外光谱 纳米压痕 杨氏模量 硬度     

Variational principles for two kinds of extended Korteweg—de Vries equations

Variational principles are constructed using the semi-inverse method for two kinds of extended Korteweg—de Vries (KdV) equations, which can be regarded as simple models of the nonlinear oceanic internal waves and atmospheric long waves, respectively. The obtained variational principles have also been proved to be correct.     

川西北米亚罗地区雪积/雪融光谱测量及光谱分析

山地冰盖和积雪在全球很多地区的水分平衡中发挥着重要的作用,目前大面积山地冰盖和积雪的测量方法主要依靠遥感测量方法.为使用遥感反演某地区山地冰盖和积雪的储存量,了解其光谱特征是快速、准确建立反演算法的基础.以川西北米亚罗地区为研究区,布设了24个测控点,在2007年1月利用ASD便携式地物光谱仪对该地区积雪进行了积雪反射...