我国农村房屋的地震破坏分析与工程抗震处理对策     

查润华  胡洁  徐芸 《山西地震》2007,(3):27-30,36

根据对我国农村建(构)筑物震害的调查结果,总结了农村房屋的震害特征,分析了建(构)筑物破坏的主要原因及农村房屋建(构)筑物在选址、施工、抗震设防等方面的教训,采用有限元分析比较了基础材料不同时基础部分的抗震差异。提出了提高农村房屋抗震能力的对策和建议。  相似文献   

Time Series Analysis on the Ratio for Pixels with Abnormal Brightness Temperature Increase and Its Variation Before Some Earthquakes with Ms ≥ 5.0 in the Taiwan Area     

Liu Fang 《中国地震研究》2007,21(4):437-444

In the study of the application of MODIS satellite remote sensing data to earthquake prediction, the paper puts forward for the first time a quantitative method to estimate the ratio for the pixels with abnormal brightness temperature (BT) increase and a preliminary scheme for cloud removal. The principle is that, firstly, the cloudless data observed by the same satellite at the same period of time but in different days (usually 1 day to 3 days) are mosaiced to get high ratio of clear sky, and then the BT variation curve and mean square difference (MSD) of each pixel are calculated with the data from the covered area to determine daily whether the BT data of the day is normal or not at a certain pixel by using double the MSD as the criterion. The ratio for the pixels with abnormal BT increase can be calculated by dividing the total number of abnormal pixels with the total pixels of the whole area. Analysis on a series of recent earthquakes in the Taiwan area shows that the ratio for pixels with abnormal BT increase, which normally undulates around zero, has a sudden enhancement 1 day to 20 days before medium-strong earthquakes. It is expected that a new method for identifying earthquake auspice could be found through special studies in regions with frequent seismic activity by analyzing the change of the ratio for the pixels with abnormal BT increase from MODIS satellite remote sensing infrared (IR) information from which the effect of clouds has been removed to a certain extent.  相似文献   

完善建筑物内部防雷装置设计的实践经验   总被引：1，自引：17，他引：1  

林海滨 《气象研究与应用》2007,28(3):56-58

根据进一步完善建筑物内部防雷装置设计一些实践经验,提出了新建建筑物应从分流、屏蔽、接地和等电位连接等方面综合来考虑,使其达到综合防雷目的。  相似文献   

气象软件汉化在GPS水汽观测中的应用     

覃伟 《气象研究与应用》2007,28(2):81-83

通过对气象中应用的GPS水汽观测软件进行分析和汉化,阐述软件汉化的过程和方法。  相似文献   

气候概率分布理论的新内涵及其展望   总被引：2，自引：0，他引：2  

丁裕国 《沙漠与绿洲气象(新疆气象)》2007,1(2):1-5

近年来,国内外学者关于气候概率分布理论和应用的研究已经取得了许多新的成果,本文简要回顾近年来这一领域已经发展起来的新内涵,并提出未来可能的研究设想。  相似文献   

一种基于统计的边缘阈值检验新方法     

王文庆  侯本军  支华  龚俊 《地理空间信息》2007,5(1):89-91

提出了建立在统计分析的基础上边缘阈值检验方法,每个像素的阈值由像素所处的梯度矢量的统计特性决定,这些梯度矢量的统计量用来确定边缘像素选取是否合理,从所获得的结果来看,该方法与以往的边缘检测方法不仅是一致的;而且,该方法输入参数值产生的结果比其它几种边缘检测方法更稳定。  相似文献   

Radar measurements of integral parameters of hailstorms used on hail suppression projects     

Viktor Makitov   《Atmospheric Research》2007,83(2-4):380-388

The exact quantitative estimation of hailstorm precipitation intensity, allowing determining successfully the crop hail damage, is extremely necessary while carrying out of programs of experimental researches of the hail clouds as well as at realization of operative projects on hail suppression. On the other hand, the possibility of obtaining a trustworthy information about changes of hailfall intensity during cloud seeding operations enables to judge more objectively about seeding effect and to make a decision about its beginning and termination. Just because of such a parameter, the kinetic energy of hailfalls presents a great interest for the researchers. As it is known, measuring the kinetic energy of hailfalls is carried out both directly by ground network of hailpads, and by radar methods. The accuracy of the radar methods of the hail kinetic energy measurement strongly depends not only on the choice of an optimum formula for calculation but also on the algorithm used for separating hail and rain parts of radar echo and on the way it was used in the hail–rain mixture zone of precipitation.The method of calculating the kinetic energy of the hailfalls, based on empirical dependence of hail probability P_h on a height of a zone of a radar echo with a reflectivity of 45 dBZ above a level of zero isotherm ΔH₄₅, is offered in the given work. The algorithm of separating hail and rain parts of a radar echo and the way it was applied in a hail–rain mixture zone is described. The examples of hail streaks in contours of radar reflectivity and in isopleths of hail kinetic energy obtained using the given algorithm are shown.In Mendoza province (Argentina), a hail suppression project (1993–1997) for the analysis of the vertical structure of a radar echo with Z_max > 45 dBZ, such new parameter is an integral altitude, was used. This dimensionless parameter is most sensitive to such a condition of radar echo when all four contours of increased reflectivity Z₄₅, Z₅₅, Z₆₅, and Z₇₅ synchronously reach the maximal values. The analysis of time distributions of the main radar parameters of hailstorms on a background of values of integral altitude is resulted. It is shown that local hailfall maximum intensities on the ground are observed after the achievement of maximum integral altitude with a certain delay. It enables to predict zones of the greatest hail damage in a mode of radar observation.  相似文献   

对GZRS房产测绘系统分摊模式的探讨     

廖海燕  李军玲 《地理空间信息》2007,5(5):97-99

结合实际工作对广州市房产面积测算目前使用的GZRS绘图系统的分摊模式进行了详细的分析,说明了只有正确理解各个分摊模式的概念,才能使测量成果质量得到保证。  相似文献   

应用天文学研究进展     

黄珹 《天文学进展》2001,19(2):113-120

对应用天文学涉及的领域以及国际上应用天文学的特点作了介绍，分析了我国应用天文学的研究现状，展示了我国在诮天文所依托的基础科学研究领域和应用天文学领域取得的成绩与进展，其涉及范围比较广泛，但也指出了与国际先进国家相比我国应用天文学的水平尚有差距，最后对我国应用天文发展提出了初步的构想。  相似文献   

In-flight Performance of the Advanced Camera for Surveys CCDs     

Mark Clampin  Marco Sirianni  George F. Hartig  Holland C. Ford  Garth D. Illingworth  Bill Burmester  William Koldewynd  Andre R. Martel  Adam Riess  Ronald J. Schrein  Pamela C. Sullivan 《Experimental Astronomy》2002,14(2):107-115

The Advanced Camera for Surveys (ACS), installed in the Hubble Space telescope in March 2002, will significantly extend HST's deep, survey imaging capabilities. ACS has met, or exceeded, all of its key performance specifications. In this paper we briefly review the in-flight performance of the instrument's CCD detectors and preview early ACS science observations. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献