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Search Results: 1 - 10 of 37052 matches for " Zheng Shao-Bai "
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SOFT X-RAY EMISSION AND ITS FLUCTUATION IN CT-6B TOKAMAK
CT-6B托卡马克装置中软X射线辐射及扰动

QI XIA-ZHI,ZHENG SHAO-BAI,
戚霞枝
,郑少白

物理学报 , 1984,
Abstract: Soft X-ray diagnosis is a important method in the research of tokamak plasma instability. In this paper, we give the result of soft X-ray measurment in CT-6B tokamak by using Au(Si) surface barrier detector array, and present the spatial distributions of sofr X-ray emission for various plasma instability in our device.
TEST PARTICLE DIFFUSION ACROSS A SINGLE ISLAND IN A TOKAMAK
试探粒子横越单一磁岛的扩散

ZHENG SHAO-BAI,A J WOOTTON,
郑少白
,A. J. WOOTTON

物理学报 , 1990,
Abstract: In this paper, the phenomena of a test particle diffusion near a single magnetic island in a Tokamak is investigated by the method of Monte Carlo and an effective diffusion time is used to describe the effect of diffusion by the island quantitatively. The results show that there is a uniform function between effective diffusion time and a value called collision raie. The relationsipe between the effective diffusion time and the collision rate and the particle density distribution inside and near the islnad are calculated.
ON THE DISPLACEMENT STABILITIES OF A PLASMA COLUMN IN TOKAMAK
托卡马克中等离子体柱的位移稳定性

ZHENG SHAO-BAI,WANG LONG,
郑少白
,王龙

物理学报 , 1984,
Abstract: 本文考虑托卡马克中纵场的作用以及等离子体柱和与之有互感的外迴路的相互作用,在圆截面,瘦环假设下,得到了自由运动时相对于沿水平方向、垂直方向的位移,以及小半径变化的一般稳定条件。由于强纵场的影响,一般来说,等离子体柱的小半径总是随着大半径的变化而改变,以维持通过等离子体角向电流迴路的磁通不变。对于这种扰动,当考虑到外迴路电流变化以后,稳定区域超过公式0
MEASUREMENT OF POLOIDAL MAGNETIC FIELD OF TOKA-MAK BY LASER EXCITED FLUORESCENCE OF HIGH ENERGY Li BEAM
利用高能锂束激光荧光法测量托卡马克中的角向磁场

ZHENG SHAO-BAI,YANG XUAN-ZONG,W P WEST,D M THOMAS,
郑少白
,杨宣宗,W. P. WEST,D. M. THOMAS

物理学报 , 1990,
Abstract: In this paper the principle, experimental setup and technique of the tokamak poloidal magnetic field measurement by laser excited fluorescence of high energy Li beam are presented. The main diffeculties and its limitations are also mentioned.
SPECTROSCOPIC MEASUREMENT OF PLASMA POLOIDAL ROTATION ON THE CT-6B TOKAMAK
CT-6B托卡马克等离子体角向转动的光谱测量

ZHAO QING-XUN,LI ZAN-LIANG,ZHENG SHAO-BAI,
赵庆勋
,李赞良,郑少白

物理学报 , 1997,
Abstract: 利用高分辨光谱测量系统,根据杂质离子谱线OⅡ464.2nm,CⅢ464.7nm和氢Hα谱线的多普勒位移,测量了CT-6B托卡马克等离子体角向转动速度的径向分布.结果表明:杂质离子的角向转动速度的方向在等离子体内部为电子逆磁漂移方向,其线速度在小半径约9cm处达到极大值3.5km/s;在接近孔阑r=10cm处,反转为离子逆磁漂移方向.由此导出等离子体内部的径向电场向里,其最大值为18V/cm.中性氢原子只存在其方向为电子逆磁漂移方向的角向转动分量,其数值较杂质离子谱线所得结果要低.最后对所得的结果作了初步的讨论
Poloidal rotation of main ions in the CT-6B tokamak
Poioidai rotation of main ions in the CT-6B tokamak

Feng Chun-Hu,Li Zan-Liang,Yang Xuan-Zong,Zheng Shao-Bai,Li Wen-Lai,Wang Long,
冯春华
,李赞良,杨宣宗,郑少白,李文莱,王龙

中国物理 B , 2003,
Abstract: 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.
ELECTRON CYCLOTRON CURRENT START-UP FOR OHMIC DISCHARGE ON CT-6B TOKAMAK

FENG CHUN-HUA,YAO XIN-ZI,JIANG DI-MING,QI XIA-ZHI,JIANG DE-YI,LI ZAN-LIANG,WANG LONG,ZHENG SHAO-BAI,

中国物理 B , 1997,
Abstract: Electron cyclotron current start-up as a scheme to initiate ohmic discharges has been investigated with two circuits of open and shorted primary windings of transformer. The experimental results indicate that we can achieve the saving of equivalent flux and the reduction of starting voltage in the initial phase for the two circuits in fundamental frequency resonance region.
Electroencephalography Feature Extraction Using High Time-Frequency Resolution Analysis
Zhang Shao-bai,Huang Dan-dan
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i6.1395
Abstract: The way to analyze EEG signals is mainly the method of time-frequency analysis, which cross terms and resolution are two contradictory factors. However, the high time-frequency resolution analysis (HTFRA) can combine both of them. The HTFRA is based on the Wigner-Ville distribution and effectively eliminate the cross of Wigner-Ville distribution without affecting the signal resolution by using the Median Affined Filter MAF method for nonlinear filtering. The simulated signals are analyzed with Short-Time Fourier Transform, Wigner-Ville distribution, and HTFRA, respectively. The results indicate that HTFRA give a better energy distribution in the time-frequency field compared with the traditional methods.
Al2O3-based Compressive Seals for Planar Intermediate Temperature Solid Oxide Fuel Cells
平板式 ITSOFC用 Al2O3基压密封材料研究

SANG Shao-Bai,LI Wei,PU Jian,LI Jian,
桑绍柏
,李炜,蒲健,李箭

无机材料学报 , 2008,
Abstract: 以Al2O3和Al微粉为主要原料, 采用流延成型工艺生产的Al2O3基密封材料, 在模拟的平板式ITSOFC密封环境中对材料的密封性能进行测试, 并借助X射线衍射仪、扫描电子显微镜对测试后的材料进行表征. 结果表明, 采用优化的流延成型工艺可以生产出柔韧性良好的Al2O3基密封材料. Al2O3基密封材料在较小的外加压力下表现出较好的密封性能. Al微粉的加入, 减少了材料中的漏气通道, 增加了漏气通道的弯曲程度, 不仅提升了材料的密封效果, 而且改善了材料的中期稳定性. 采用流延成型含10wt%~20wt%Al微粉的Al2O3基密封材料以压密封方式来实现平板式ITSOFC的密封是可行的.
C0-stabilizablity of nonlinear control-affine systems
非线性仿射控制系统的C0镇定性

CHEN Shao-bai,TAN Guang-xing,MAO Zong-yuan,
陈少白
,谭光兴,毛宗源

控制理论与应用 , 2006,
Abstract: In order to eliminate the difficulty in the design of Lyapunov function proposed by Sontag,the C~0-stabilizab- lity of nonlinear affine control systems is studied in this paper.Firstly,the accumulation point condition is briefly introduced in order to ensure the continuity of the Sontag's formula.Secondly,the accumulation point condition is also proved to be necessary for the continuity of Sontag's formula.Thirdly,the strict control Lyapunov function is replaced by non-strict control Lyapunov function in the nonlinear affine control systems.Motivated by LaSalle theorem,the system with non- strict Lyapunov function which is said to satisfy the accumulation point condition is proved to be C~0-stabilizable,the optional range of Lyapunov function is thus extended.Finally,an example of frictional spring system is given to validate this theory.
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