Early scale effect and hemisphere superiority on the visual spatial attention: From the electrophysiological evidence of ERP

The visual attention mechanism in the brain was studied among 16 young subjects through the precue-target visual search paradigm using the event-related potentials (ERPs) technique, with the attentive ranges cued with different scales of Chinese words. The results showed that the response time was shortened as the cue scale was reduced, while the amplitudes of the P1 and N1 components of the ERPs increased. These results not only provided the electrophysiological evidence supporting the spotlight theory, but also indicated that the spotlight effect occurred during the early period of the selected attention. Two kinds of separation in the P2 effect were observed. One separation was between the P1 effect and P2 effect, which meant that additional computation was needed when the spatial scale of attention was enlarged; the other was between the left and right hemisphere of the P2 effect, which indicates that the attentive processing of the cue range mainly occurred in the left hemisphere.     

新型人工天空半球内表面亮度分布的理论

针对旧式人工天空半球内表面亮度分布不合理的现象，提出一种新型人工天空半球的构造方法，并从理论上加以论证。在新型人工天空半球内 ，用均匀扩散透射材料形成环形散射光源，从天顶到地平线依次贴上反光系数递减的材料，可使人工天空半球内表面亮度分布与全阴天的真空天空亮度分布一致。这对于改进现有人工天空半球的亮度分布，提高模型测量采光系数的真实性和准确性，以及模拟不同地区气候散射光环境都有实际意义。     

一种应用面积等比约束的半球面纹理映射算法

球面或半球面是两步纹理映射算法中使用较多的一种中介面。两步法中的球面纹理映射算法一般通过立体投影来实现，不可避免产生较大的纹理形变。本文首先对传统基于立体投影的球面(半球面)纹理映射算法及其不足之处进行分析，并在此基础上提出一种半球面纹理映射新算法。该算法用映射纹理区在纹理平面和半球面上的对应面积比为约束务件，显著提高了纹理映射质量。文章通过理论分析和实验对新算法与传统算法进行比较，表明新算法具有其优势，并给出几个应用新算法的两步纹理映射产生的实例，显示出本文算法对减少映射纹理变形所起的作用。     

半球面与半平面安排以及Linhart的一个猜测

首先给出半球面安排与半平面安排之间的一些联系，然后得到关于半平面安排的权和的一个方程.在此基础上证明了J.Linhart关于权和的一个猜测.     

均匀带电半球面底面上的电场与电势

根据均匀带电球面内电势处处相等的特点和电势叠加原理两种方法求解了均匀带电半球面底面上的电势分布;运用电场强度公式计算出均匀带电半圆环轴线一点电场强度,并利用此结果结合Taylor展开得到均匀带电半球面底面上一点电场强度的级数解.     

数控车床加工半球面时的误差分析及补偿

分析了数控车床在加工球面时由于忽略切削刃形状而产生的系统误差 ,并在实验基础上提出了补偿此加工误差的办法 ,以及对有关参数进行修正的运算公式。提高了数控车床加工半球面时的加工精度     

Successful operation of a cooperative SLR station of China and Argentina in San Juan

We introduced the observations and researches using a Satellite Laser Ranging (SLR) system with high precision, which was designed and made in China and installed in the Observatory of San Juan Uni- versity, Argentina, the capability of the system and the achievement of the cooperative procedure be- tween China and Argentina. The SLR station in San Juan, set up by China and Argentina, is quite sig- nificant for improving the distribution of SLR stations and enhancing the orbital coverage of the whole earth. Since the SLR system started to work in the Observatory of San Juan University in the beginning of 2006, the operation is rather good, and rich data with high precision have been obtained. Further plan of the cooperation for the near future is also presented.     

平流层NAM异常对乌拉尔山阻塞高压的影响

使用NCEP/NCAR再分析资料, 对53年(1958?2010年)冬季的平流层北半球环状模(NAM)正、负异常下传期间乌拉尔山阻塞高压的活动特征分别进行合成分析。结果表明, 在平流层NAM负异常下传期间, 阻塞高压事件的发生频次更高, 生命期更长, 并且在空间上发展得更加深厚。阻塞高压崩溃之后, 冷空气主体偏北, 所造成的我国北方地区降温也更强。通过对E-P 通量分析发现, 在NAM负异常下传期间, 乌拉尔山区域的波动更容易向上传播, 更有助于对流层乌拉尔山阻塞高压的维持和发展。这些结果对利用平流层环流异常信号预测我国北方冬季短期气候变率, 尤其是寒潮天气有重要意义。     

金丝雀端脑发声控制通路及左半球优势现象的研究

用ＨＲＰ顺、逆行追踪方法，研究金丝雀端脑发声控制中枢上纹状体腹侧尾端核（ＨＶｃ）的纤维联系及古纹状体栎核（ＲＡ）的左半球优势现象。     

波浪在半球上绕射的解析解

基于线性势流理论,推导了无限水深中波浪在半球上绕射问题的解析解.给出了球坐标系下无限水深入射波速度势的表达式;利用多极子展开法,以包含未知系数和连带勒让德函数的无限序列的形式给出了流场中绕射速度势的表达式;通过物面边界条件建立了方程组,进而求解了未知系数.计算了作用在半球上总的波浪激励力,并通过与利用Haskind关系得到的结果以及他人的数值结果进行比较,验证了文中结果的正确性.