Specific features of the high-speed plasma stream cycles

The high-speed plasma streams in the solar wind are investigated during the solar cycles nos. 20–22 (1964–1996), separately on the two types of streams according to their solar origin: the HSPS produced by coronal holes (co-rotating) and the flare-generated, in keeping with the classification made in different catalogues. The analysis is performed taking into account the following high-speed stream parameters: the durations (in days), the maximum velocities, the velocity gradients and, the importance of the streams. The time variation of these parameters and the high-speed plasma streams occurrence rate show an 11-year periodicity with some differences between the solar cycles considered. A detailed analysis of the high-speed stream 11-year cycles is made by comparison with the “standard” cycles of the sunspot relative number (Wolf number). The different behaviour of the high-speed stream parameters between even and odd solar cycles could be due to the 22-year solar magnetic cycle. The increased activity of the high-speed plasma streams on the descendant phases of the cycles, regardless of their solar sources, proves the existence of some special local conditions of the solar plasma and the magnetic field on a large scale that allow the ejection of the high energy plasma streams. This fact has led us to the analysis the stream parameters during the different phases of the solar cycles (minimum, ascendant, maximum and, descendant) as well as during the polar magnetic field reversal intervals. The differences between the phases considered are pointed out. The solar cycles 20 and 22 reveal very similar dynamics of the flare-generated and also co-rotating stream parameters during the maximum, descendant and reversal intervals. This fact could be due to their position in a Hale Cycle (the first component of the 22-year solar magnetic cycle). The 21st solar cycle dominance of all co-rotating stream parameters against the 20th and 22nd solar cycle ones, during almost all phases, could be due to the same structure of a Hale Cycle – solar cycle 21 is the second component in a 22-year SC. During the reversal intervals, all high-speed stream parameters have comparable values with the ones of the maximum phases of the cycles even if this interval contains a small part of the descendant branch (solar cycles 20 and 22).     

利用有限域上的辛几何构作一类Cartesian认证码

利用了有限域上的辛几何构造了一类Cartesian认证码，并且计算了其参数及模仿攻击成功的概率和替换攻击成功的概率．     

微波场强自动计量测试研究

介绍了微波场强计量测试的原理方法 ,主要介绍了在中文 WINDOWS95环境下利用 VB6 .0语言编程进行自动计量测试的研究情况以及测量不确定度分析。     

建筑物温度场红外测试的研究

研究了采用红外热像图快速测试建筑物外表面温度场的方法，提出了一种基于信息融合的修正方法。     

The Strength and Structure of the Coronal Magnetic Field

I discuss a method for determining the strength and spatial structure of the coronal magnetic field by observations of the Faraday rotation of a radio galaxy which is in conjunction with the Sun. Given a knowledge of the plasma density in the outer corona, and the magnetic field sector structure (both independently available), the strength of the coronal field can be determined, as well as the magnitude of spatial variations on scales of 1000 km to several solar radii. Such knowledge is crucial for testing computational models of the solar corona, which are prominently featured in this meeting. Results are presented from observations with the Very Large Array radio telescope of the radio galaxy 3C228 on August 16, 2003, when the line of sight to the source was at heliocentic distances of 7.1−6.2R _⊙. The observations are consistent with a coronal magnetic field which is proportional to the inverse square of the distance in the range 6 ≤ r ≤ 10R _⊙, and has a value of 39 mG at 6.2R _⊙. The Faraday rotation is uniform across the source, indicating an absence of strong plasma inhomogeneity on spatial scales up to 35,000 km.     

弦支组合网架结构可靠度分析

根据张弦梁结构的思想提出由组合网架和索通过支杆相连而形成的预应力结构即弦支组合网架结构。建立一弦支组合网架结构的计算模型,利用ANSYS有限元软件分析结构基于位移性能下的正常使用极限可靠度。经软件分析得出在所给几何尺寸、材料特性、预应力、恒荷载以及活荷载等随机变量作用下,结构基于位移正常使用极限状态下的可靠度是良好的;对结构位移影响最大的变量是预应力,影响最小的变量是混凝土板肋的截面尺寸;可靠度为95%的结构最大位移值是60mm。     

二元保形非对称膨胀喷管流场特性研究

利用数值模拟方法对一种与无人飞行器后体一体化设计的二元保形大宽高比非对称膨胀喷管在地面状态的流场特性进行了研究,获得了尾喷管推力性能和三维流动特征随落压比的变化趋势。结果表明：虽然二元保形非对称膨胀喷管沿横向存在非等强度膨胀,但在研究范围内最佳落压比仍主要取决于上方短膨胀面结束位置面积与喉道面积之比;沿横向不等强度膨胀诱发的二次流及旋涡流动能够增强环境冷流与喷流之间的掺混;在研究的落压比范围内,随着落压比的增加喷管的推力性能变化很缓慢。     

俄交变中磁标准装置研究

介绍了从俄罗斯引进的用于交变磁场的国防标准——交变中磁标准装置的基本工作原理,以及对其设计方案的剖析。该标准装置工作频率（20～1 000）Hz,复现交变磁场强度（0.1～1 000）mT,在这一领域内代表国际最高水平。通过对其信号获取、磁场感应信号的放大处理、大电流的产生办法、安全互锁设计,以及整体系统理论计算的分析,为该领域内标准装置的国产化提供理论基础,具有较好的实用价值。