Poloidal rotation of main ions in the CT-6B tokamak

The poloidal rotation velocity of neutral hydrogen atoms is measured using the Doppler shift of the Hα spectral line emitted in the CT-6B tokamak. The poloidal rotation of hydrogen atoms is generated through the collisions and charge-exchanges with main ions (protons). Therefore, the rotation direction of main ions can be deduced from that of neutral hydrogen atoms. The experimental results show that the main ions rotate in the electron diamagnetic drift direction, the same as the impurity ions, in the plasma core. The neutral hydrogen atoms rotate also in the electron diamagnetic drift direction in the edge region of the plasma. However, the rotation direction of main ions in the edge region cannot be judged from the experimental result due to the long mean free path of hydrogen atoms in the edge region. An inward diffusion flux of hydrogen atoms toward the torus inside with a velocity of the same order of magnitude as their poloidal rotation is also observed.     

百赫兹气动斯特林制冷机实验研究

提高运行频率可以增大功率密度,从而在维持效率一定的情况下有效减小制冷机的体积和重量.本文针对一台工作在100 Hz以上频率的气动斯特林制冷机开展了实验研究.实验表明,在一台商用线性压缩机驱动下,该制冷机可获得77.1 K的最低无负荷制冷温度,当工作在105 Hz,充气压力2.50 MPa时,可在100.0 K提供0.52 W制冷量.     

光栅衍射型超广角激光告警系统光斑定位方法

成像光斑中心精确定位是光栅衍射型超广角激光告警系统具有高定向准确度和高波长分辨能力的基础.本文分析了光栅衍射型超广角激光告警系统成像光斑特点.针对随激光入射角增大,系统成像光斑畸变为强度近似高斯分布倾斜光斑的问题,提出一种改进型高斯拟合法计算光斑中心,通过仿真模拟和实验测试研究了新方法的定位性能.模拟结果表明,高斯噪音标准差为0.01情况下,光斑长轴与x轴夹角由0°逐渐增大为90°过程中,本文方法的定位误差平均值小于0.005像素,误差标准差小于0.02像素.实验测试表明,实验图像经帧相减和高斯平滑滤波预处理后,光斑长轴与坐标轴方向一致时,本文方法与高斯拟合法的定位结果非常接近,明显优于灰度重心法.光斑倾斜时,本文方法求得的激光入射方向角的误差均值和标准差明显小于灰度重心法和普通高斯拟法.     

半交换环的一个推广研究

In this paper, a generalization of the class of semicommutative rings is investigated.A ring R is called left GWZI if for any a ∈ R, l(a) is a GW-ideal of R. We prove that a ring R is left GWZI if and only if S3(R) is left GWZI if and only if Vn(R) is left GWZI for any n ≥ 2.     

秩$6$的无三角形的图

The rank of a graph G is defined to be the rank of its adjacency matrix A（G）. In this paper we characterize all connected triangle-free graphs with rank 6.     

CT-6B托卡马克等离子体密度涨落的测量

采用光学多道探测系统，观测了ＣＴ-６Ｂ托卡马克等离子体密度涨落的幅度、频率特性和相关性以及它们的空间分布．结果表明：等离子体密度涨落的幅度为１０％—９０％，边缘区的涨落幅度高，中心区的涨落幅度低；无论边缘区还是中心区的功率谱均为连续谱；并发现边缘区的涨落具有时断时续的局部相关结构，每次相关持续的时间为０.２—０.５ｍｓ，空间尺度为０.５—１ｃｍ．     

阿魏菇多糖的提取、纯化及其组成研究

采用热水浸提、Sevag法去蛋白、乙醇沉淀，冷冻干燥，从阿魏菇（pleurotus ferulae Lenzi）子实体及菌丝球中提取阿魏菇粗多糖（PFP）， 苯酚－硫酸法测定多糖含量为PFP147．2％，PFP为41．4％，经过Sephadex200层析柱分离和薄层层析分析，可知阿魏菇多糖是由三种单糖组成的均一杂多糖。     

NUMERICAL SIMULATION OF ECR PLASMA SOURCES

The available electron cyclotron resonance plasma source has been simulated in two-dimensional configuration space (z, r) and three-dimensional velocity space (V_z, V_r, V_θ). Using a hybrid model, we treat ions as particles and electrons as fluid. The motion of ions and electrons is determined by external magnetic field and self- consistent electrostatic field. For a given magnetic distribution, the spatial profiles of electron temperature, plasma potential, plasma density and ionization rate have been obtained. The influences of microwave power, neutral gas pressure and magnetic field on plasma parameters have been studied. The comparisons between simulation and experimental results are made and the explanations for some physical phenomena are given.     

Calculation of ion energy distributions of argon excimer ions generated in helicon plasma

A program is developed to calculate the ion energy distributions （IEDs） of Ar2^＋ making use of a simplified kinetic model with a combination of Monte Carlo method. Several coefficients are used to realize good match between the calculated and measured results. Some important assumptions are confirmed： argon excimer ions have short lifetime, hence they are formed in a short range before the collecting electrode. The excimer ions that encounter collisions will be discarded because they turn to other ion species after they collide with argon atoms. From the calculated results some plasma parameters such as the cross section or neutral density in discharge could be evaluated.     

封面说明

大气压介质阻挡放电形成的斑图 .这是一种可工作于大气压的放电装置 ,可用于产生臭氧、化学反应、材料表面处理等 ,也可用于研究斑图动力学和时空动力学 .放电方式有辉光和流光两种 .在流光放电中 ,每一放电通道可认为是一个准粒子 .它们的运动构成如图所示的斑图 .上电极用玻璃容器充以普通水兼作冷却介质和透明介质便于观察 ,水里浸一金属丝导电 .下电极可用铜 ,也可用另一水池 ,上面覆以玻璃片 .上下电极间隙 1ｍｍ左右 .普通相机照相 .只需一台频率为几千周到几十千周、电压几千伏的电源 ,这一实验很容易在任何中学实验室进行封面说明$…