1994年9月16日台湾海峡7.3级地震静态库仑应力变化及断裂危险性初步研究

Using the focal mechanism solutions and slip distribution model data of the Taiwan Straits MS7.3 earthquake on September 16, 1994, we calculate the static Coulomb stress changes stemming from the earthquake. Based on the distribution of aftershocks and stress field, as well as the location of historical earthquakes, we analyze the Coulomb stress change triggered by the Taiwan Straits MS7.3 earthquake. The result shows that the static Coulomb stress change obtained by forward modeling based on the slip distribution model is quite consistent with the location of aftershocks in the areas far away from the epicenter. Ninety percent of aftershocks occurred in the stress increased areas. The Coulomb stress change is not entirely consistent with the distribution of aftershocks near the epicenter. It is found that Coulomb stress change can better reflect the aftershock distribution far away from the epicenter, while such corresponding relationship becomes quite complex near the epicenter. Through the calculation of the Coulomb stress change, we find that the stress increases in the southwest part of the Min-Yue (Fujian-Guangdong) coastal fault zone, which enhances the seismic activity. Therefore, it is deemed that the sea area between Nanpeng Island and Dongshan Island, where the Min-Yue coastal fault zone intersects with the NW-trending Shanghang-Dongshan fault, has a high seismic risk.     

Seismic microzonation of Chania,Crete (Greece) based on SASW measurements and non-linear site response analyses

Following a brief overview of past applications of, and more recent advances on seismic microzonation, the results of a seismic microzonation study for the city of Chania, Greece, are presented. The study was based on V_s vs. depth profiles obtained at 19 sites of the urban area by performing SASW measurements. The spatial distribution of V_s values was utilized in estimating V_s30 values, depth to bedrock and the fundamental ground period variation across the area of the city as well as for conducting 1-D finite element non-linear inelastic site response analyses. The input earthquake excitations employed in the response analyses were based on the results of an available seismic hazard study for the Chania Area. The results of analyses were utilized for establishing the spatial distribution of rock motion amplification, the expected ground motions and spectral values in the area of the city. Contour maps providing values of the expected ground motion in the urban area are given which may become a practical tool in assessing the seismic risk and expected damage in the Chania area. The maps can also be used in the design of new earthquake resistant structures or the seismic retrofitting of existing ones. Finally, the results were utilized to demonstrate the inadequacy of using V_s,30 values for classifying the soil conditions in the Chania area.     

New Periodic Solution for Planar 8-body Problems

For planar Newtonian 8-body problems with equal masses, we prove the existence of the new non-collision periodic solution such that two pair bodies move clockwise and the other two pairs counter-clockwise. This revised version was published online in July 2006 with corrections to the Cover Date.     

Spectral and photographic studies of the known T association in the neighborhood of Cyg OB7

Spectral and photographic observations of an 11′×11′ region in the center of the known association Cyg OB7 are presented. The observations were made on the 2.6-m telescope of the Byurakan Astrophysical Observatory in 2004. The spectral camera SCORPIO, a multiregime focal reducer for the primary focus, was used. One new HH node and three new emission stars were discovered in the region under study. One of the previously known emission stars is found to have spectral class M0Ve and to lie at a distance of 200 pc. Some variability is detected in the brightness of a known infrared nebula and the cometary nebula CN2. __________ Translated from Astrofizika, Vol. 49, No. 3, pp.375–390 (August 2006).     

基于PO7D的晶振频率自动测量系统

针对PO7D频标比对器存在独占性和程控性差的特点,结合晶体技术指标的检测方法和PO7D自身的优点设计了一个晶体频率自动测量系统,解决PO7D的独占性,增强其程控功能.具体实现是通过调整测量命令的执行方式,控制PO7D对被检晶体的信号和参考信号的比对,将测量所得的频率差值数据,再根据规范计算出晶振的相关技术指标.     

用SERVLET过滤器简化中文的输入和输出

分析了SERVLET2.3规范新增加的过滤器工作原理，根据过滤器的工作原理和Java对中文编码的处理提出了解决WEB应用程序正确接收、显示中文的有效方法。同时也为软件国际化提供了一个很好的解决方法。     

H5、H7和H9亚型禽流感分子鉴别诊断方法的建立

为快速、敏感、特异地鉴别诊断现较为重要的禽流感病毒亚型,根据H5、H7和H9亚型禽流感病毒HA基因序列的保守区域设计出并合成3对特异性引物,利用这3对引物对H5、H7和H9亚型禽流感病毒的HA基因片断进行多联RT-PCR扩增,并对多联RT-PCR检测方法进行敏感性及特异性实验。结果表明:3对引物能特异性地扩增出H5、H7和H9亚型禽流感病毒HA基因片段,大小分别为490bp,365bp和686bp;该检测方法敏感性高,特异性强;初步建立起快速、敏感、特异地鉴别检测H5、H7和H9亚型禽流感病毒的分子诊断方法。     

基于Landsat8卫星数据的城市相关指数变化分析

基于Landsat8 OLI遥感影像数据,提取了与城市环境密切相关的NDVI、NDBI、NDWI和LST,分析了不同地物类型遥感指数的分布特征和不同时间序列的变化特征;进一步探讨了NDVI、NDBI与LST的相关性,可为研究城市热岛效应提供依据。结果表明,山地的NDVI最大,建筑用地密集区域的NDBI、LST最大,水体的NDWI最大,且建筑用地的NDVI、NDBI随时间变化较稳定。     

基于GF-1与Landsat-8影像的山区苹果园地信息提取

GF-1卫星影像具有空间和时间分辨率高、纹理信息丰富等优势,而Landsat-8卫星影像具有多波段、光谱信息充足等优势。针对两种影像的特点,本文分别用面向对象分类方法进行苹果园地信息提取研究,结果表明:两种影像的分类精度都比较高,但由于研究区域属于山区,地块分布不均匀,GF-1影像发挥其空间分辨率较高的优势,苹果园地面积提取精度比Landsat-8高1.19%。