动态系统白噪声估值器

用现代时间序列分析方法提出了单输入单输出(SISO)动态系统的统一的和通用的白噪 声估值器.它包括输入白噪声估值器和观测白噪声估值器,可处理非零均值白噪声、相关白噪 声、不稳定和非最小相位系统.对于雷达跟踪系统的仿真例子说明了其有效性和可应用性.     

Study of individual differences in ERP by multivariate analysis of a few single trial ERPs

The study of Event-related potentials(ERPs) has contributed to the understanding of human psychological functions. ERPs are postulated to be multi-component electrical activities of the brain.

In our previous paper, the single trial CNV data measured at each electrode site under constant experimental conditions were analyzed by PCA - Varimax rotation - Multiple regression analysis. However, such a method requires a lot of single trial CNV samples to estimate the clearer CNV components.

The purpose of the present study is to compare the differences in CNV components between individual subjects. In order to extract satisfactory CNV components from few single trial data, the CNV samples were multiplied by uniform pseudo-random numbers generated by computer.

The results indicated that the CNV components of each subject have specific waveshape and amplitude.     

SISAM中光源尺寸和调制幅度的同步调整

通过对干涉选择调幅光谱仪扩展函数的计算、分析，可知在光谱扫描过程中，面光源的大小以及调制器的调制幅度应相应地随之变化，并得出这一变化的规律。     

涡轮叶片材料及制造工艺的研究进展

针对航空发动机涡轮叶片的工作环境和使用要求,介绍了提高涡轮叶片耐温能力的两种途径,即加强叶片冷却和提高叶片材质自身的耐温性能。文中着重评述了用作叶片材料的合金及其制造工艺的研究进展与发展趋势。     

单边带发送与接收

为更有效地利用短波广播频段,改善其广播质量,单边带制广播提到了议事日程。本文就单边带制的特点、产生机理、发射机的设计要求、提高发射效率的措施等进行较详细的介绍。     

单杆数据采集专用系统的软硬件设计

介绍了具有单杆位移数据的采集、变换和传送等功能的8098单片机专用系统软硬件设计方法,并着重叙述了可实现单杆在0°-360°区域范围内进行精确跟踪控制的编程方法。     

process and mechanism of growth of YBa2Cu3O6+x single crystal by the pulling method

Continuous growth of YBa₂Cu₃O_6+x(Y123) single crystals was achieved by the modified pulling method1 using BaO+CuO(3:5) solvent and Y₂BaCuO₅(Y211) solute. Y211 solid was placed at the bottom of the crucible. Temperature was set ten degrees higher at the bottom than on the surface of the solution. The crystal rotation speed was 120 rpm at first; but as the crystal radius increased, it was reduced to prevent increasing the interface temperature. The maximum crystal growth rate was about 0.2 mm/h. The crystal growth direction was controlled by the seed crystal direction.2 Two-dimensional numerical simulation was performed using a finite-difference method by a supercomputer to investigate the solution flow and temperature distribution.     

Temperature dependence of vickers microhardness and creep of InBi single crystals

Variation of Vickers microhardness of InBi single crystals with temperature has been studied. Loading time dependence of the microhardness at different temperatures has been used for the creep study in the temperature range 30° – 85°C. The activation energy for creep has been evaluated and the results are discussed.     

"十五"期间中国直拉硅单晶炉用石墨材料的市场预测

通过调研,对“十五”期间中国直拉硅单晶炉用石墨材料市场进行了预测。