用快波加热燃烧等离子体

在把离子伯恩斯坦波处理成对快阿尔芬波的响应下，导出了点火托卡马克等离子体的离子回旋共振加热的二阶模转换方程。这个二阶方程的数值积分表明，结果与由高阶方程的计算很好地一致。只有在弱阻尼的情况下，α粒子吸收的功率才是重要的。     

矩阵特征值的几个不等式

研究矩阵特征值的上、下界以及特征值的实部、虚部的不等式 ,给出了特征值一些新的上界和下界     

线性泛函方程解的振动性的新结果

本文研究高阶泛函方程x(g(t))=P(t)x(t)+Q1(t)x(g2(t))+…+Qk(t)x(gk+1(t))解的振动性,得到了一些新的振动条件.改进和推广了已有结果.     

弱闭T(N)-模的预零化子的等距映射

本文刻划了弱闭T(N)-模的预零化子间的等距映射.设u,W分别为由左连续序同态N→~N和N→~N所确定的弱闭T(N)-模, u(?),W(?)分别为u,W的预零化子,Φ为由u(?)到W(?)上的线性等距映射.若(0)*=(0)#=(0),dim(0)+≠1且min{dim(H(?)~H),dim(He(?)^H)}≥2,则存在酉算子Ui,Vi(i=1,2),使得Φ(A)=U1AV*1或Φ(A)=U2A*V2*.     

Field emission from nano-patterned amorphous carbon

Electron emission from nano-patterned amorphous carbon is realized in this paper. The patterned carbon consists of islands with size of tens of nanometers, and is formed by etching uniform carbon film in oxygen plasma using a bismuth island-like film as the mask. Uniform and stable electron emission is reproducibly obtained, and the emission efficiency is above 2% at an anode voltage of 3 kV. Small carbon particles between large islands are supposed to be necessary for stable electron emission.     

纤维素热解过程中活性纤维素的生成研究

热重分析发现活性纤维素的生成始于530 K左右,对应于失重图上的肩部及SDTA曲线中强烈的放热峰.在辐射加热闪速热裂解试验台上获取了一种可溶于水、高温下易分解、室温下呈固态且稳定存在的黄色中间产物.扫描电镜图片证明在热裂解初期纤维素经历了一个熔化和相互粘结的状态,产物的红外谱图证实了大量的羰基和羧基官能团的生成.高效液相色谱分析证明其主要成分是一系列聚合度不同的低聚糖,推断该低聚糖即为活性纤维素.     

大气激光通信的实验测量

设计了大气激光通信信道测量系统，利用此系统在不同气象条件下进行了近地视距实验测量并采集了不同天气条件下的实验数据，详细分析讨论了所得实验数据并进行了误差分析．同时实验中获得了大量数据，为进一步完善大气激光信道模型提供了有力的依据．     

Synthesis of Nanoscale Bimetallic Particles in Polyelectrolyte Membrane Matrix for Reductive Transformation of Halogenated Organic Compounds

Nanosized Fe/Ni and Fe/Pd particles were synthesized in the polyacrylic acid (PAA)/polyether sulfone (PES) composite membrane matrix for reductive transformation of halogenated organic compounds (HOCs). The advantages of using membrane to immobilize nanoparticles are the reduction of particles loss, prevention of particles agglomeration, and potential application of convective flow. Cross-linked PAA/PES composite membranes containing metal ions as particles precursor were prepared by heat treatment with ethylene glycol (EG) as a cross-linking agent. Nanoscale metal particles were formed and immobilized inside the membrane matrix after reduction with sodium borohydride. Membrane morphology and structure were observed by scanning electron microscopy (SEM). Particle size and distribution were characterized by SEM and transmission electron microscopy (TEM). Energy dispersive X-ray spectroscopy (EDS) was used to obtain the qualitative and quantitative element information of particles. A specimen-drift-free EDS line profile and EDS mapping system was performed in a scanning transmission electron microscopy (STEM) to determine the two-dimensional element distribution of iron and nickel in the nano domain. In the dechlorination study with trichloroethylene (TCE) as a representative HOCs, rapid and complete destruction of TCE was achieved by using nanosized bimetallic Fe/Ni or Fe/Pd in PAA/PES composite membranes. Typically more than 95% of 10 mg/l TCE was reduced within 1 h. Ethane was found in the headspace as the main product.     

Ni熔体凝固过程中临界晶核和亚临界晶核的分子动力学模拟

本文用分子动力学模拟研究了Ni熔体以不同冷速凝固后微观结构的演变规律, 并通过理论计算确定出了Ni熔体凝固后获得理想非晶的临界条件. 模拟结果发现冷速小于10¹¹ K/s时, Ni 熔体凝固后形成晶态组织; 冷速在10¹¹ K/s到10^14.5 K/s之间时, Ni熔体凝固后形成由晶态结构与非晶态结构组成的混合组织. 冷速小于10¹⁰ K/s, Ni 熔体凝固后形成的晶态组织具有fcc结构; 冷速在10¹⁰ K/s到10^14.5 K/s之间时, Ni熔体凝固后组织中的晶态由fcc和hcp结构层状镶嵌排列构成. 通过分析模拟结果和计算结果, 确定出了Ni熔体凝固后形成理想非晶的临界冷速为10^14.5 K/s. 并发现Ni熔体中临界晶核(冷速等于10^14.5 K/s)和亚临界晶核(冷速大于10^14.5 K/s) 均由fcc和hcp组成层状偏聚结构, 这表明Ni熔体中生长的晶体、临界晶核和晶胚的结构是相同的. 关键词： 分子动力学模拟 晶体团簇 临界冷速 结构     

舰载光电指向器多轴系耦合精度分析

光电指向器的轴系精度直接影响到光电系统的整体性能指标。分析了光电指向器轴系之间精度影响关系,根据对方位轴系、俯仰轴系和视轴轴系的各项误差源分析计算出各轴系误差值,结合在安装过程中方位轴系误差与俯仰轴系误差建立数学模型,寻找方位角和俯仰角与方位轴系、俯仰轴系、视轴轴系的误差之间的耦合关系,并将三个轴系误差进行耦合后建立数学模型分析。该分析方法和结果为光电指向器的多轴系结构耦合误差设计提供了理论及工程依据。