Robust估计的算法优化   总被引：2，自引：0，他引：2  

苏思光  戴嘉芸 《测绘学报》1996,25(2):151-155

本文分析了Ｒｏｂｕｓｔ估计收敛慢的原因，提出以最小二乘平差的残差（Ｖ）为初始信息，用Ｌ１估计的权函数所计算的权力初始权，根据迭代计算的残差的大小，及残差的变化所提供的信息，构造出加速收敛的算法，计算结果表明，较之一般的方法，迭代次数显著减少，辨识杠杆点含粗差的能力有较大提高，即搜索粗差的效率有很大提高。  相似文献   

区域暴雨增强数值预报业务系统及其预报效果分析   总被引：3，自引：7，他引：3  

吕世华  陈玉春 《高原气象》1996,15(1):1-10

该文介绍了区域暴雨增强数值预业务系统的设计思想，主体结构及主要的关键技术，并总结了该系统业务试验的情况和效果。该系统以ＹＨ模式为基础，对其从坐标系、水平和垂直分辨率及物理过程等方面进行了改进，并结合实时资料处理系统，图形处理等形成了一个比较完整的数值预报业务体系。  相似文献   

A Review of Catalogues of Chinese Earthquakes     

Yang Zhixian  Su GangInstitute of Crustal Dynamics  SSB  P.O. Box  Beijing  China 《中国地震研究》1996,(2)

In the past decade, the most authoritative catalogues of Chinese earthquakes and the most popular with seismologists in China are the following:(1) Gu Gongxu, 1983, Catalogue of Chinese Earthquakes;(2) Min Ziqun, 1988, Concise Catalogue of Chinese Earthquakes;(3) Xie Yusuou, 1989, Catalogue of Chinese Earthquakes (M≥ 4.7) from 1900-1980 with Uniform Magnitudes; and(4) Min Ziqun, 1995, Catalogue of Chinese Historical Strong Earthquakes. Earthquakes that occurred before 1900 are mainly documented in historical records.Since 1950s, more recent earthquakes were documented in two major compilations of historical records finished in 1956 and 1983-1987. Separately this effort resulted in two chronicles: two volumes for the first one and five volumes for the second one. The magnitudes are converted from the maximum intensity. These magnitudes, by convention, are connected with surface wave magnitudes. However, it is clear that they do not have any strict seismological definition.The period of 1900-1962 documen  相似文献   

有限区域高分辨率模式的改进,发展及试验     

陈玉春  张华 《高原气象》1996,15(1):11-20

对复杂地形条件下嵌套细网和数据模式进行了改进和发展，使之成为水平格距为５０ｋｍ，垂直分层为１１层的高分辨率模式。同时对其物理过程如积云对流参数化、边界层物理等也进行了改进，并将该模式程序优化为能在计算机工作站和微机上进行业务运行的数值预报系统。  相似文献   

裂隙岩体渗流模型综述   总被引：19，自引：0，他引：19       下载免费PDF全文

王媛  速宝玉 《水科学进展》1996,7(3):276-282

系统综述了裂隙岩体渗流分析的各类模型,从各类模型所反映的渗透机理出发,阐明了它们的优缺点和适用条件及其工程应用情况。集等效连续介质模型和离散裂隙网络模型优点的等效-离散耦合模型是有实用前景的裂隙渗流模型。  相似文献   

北京地区夏季背景气溶胶的特征   总被引：3，自引：0，他引：3  

徐晓斌  杨东贞  温玉璞  苏维瀚 《气象学报》1992,50(3):310-319

本文通过对观测资料的统计分析和比较研究,初步揭示了北京地区夏季背景气溶胶的一些特征,其中包括元素浓度及其变化、富集因子和气溶胶来源等。  相似文献   

汾渭地震带的地震活动性   总被引：2，自引：0，他引：2  

苏怡之  王进英 《内陆地震》1992,6(2):143-150

根据历史强震与现代地震的资料,研究、分析了汾渭地震带强震及中、小地震的时、空、强分布特征,对该带未来地震危险性进行了探讨。  相似文献   

A data collection and analysis system for research on rock fracturing     

Cantao Zhuang  Su Xu  Weixue Zhang  Zhaoyong Xu  Shirong Mei 《地震学报(英文版)》1992,5(3):609-615

We have made a data collection and analysis system for recording microcracks in rock to study the three dimensional pattern of fracture and the dynamic properties of rock during pressurization. This system, with 8 channel data detection, records in real-time, from the initial microcracks to the final vibration waveform excited by the master fracture. The detected data are recorded digitally at the hard disk of an IBM computer (or 286, 386 personal computer) as well as transmitted to disk. The sampling rate for each channel is 10 MHz. Collecting every acoustic emission events in the loaded rock sample with 8 channels by this system, mathematically modelling the AE event travel time, and taking the coordinates of the AE event hypocenter and the three components of P wave velocity as unknown parameters, we set up a set of residual equations for joint inversion, so that the three dimensional localization of AE event hypocenters can be completed under variable velocities, which will lay foundations for the research on rock fracture clearly. The Chinese version of this paper appeared in the Chinese edition ofActa Seismological Sinica,13, 489–495, 1991. The design and development of the system, and the experiments are sponsored by the Chinese Joint Seismological Science Foundation.  相似文献   

贵州青岩地区三叠纪的沉积体系及盆地演化史     

雷建喜  吴冬 《地球科学》1992,17(5):495-502,T001

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河南省中生代含煤地层中的洪水流沉积          下载免费PDF全文

陈传诗  苏现波 《沉积与特提斯地质》1992,12(1):26-32

河南省中生代含煤地层主要包括上三叠统、下中侏罗统、上侏罗统三个层段。由于这些煤系地层多形成在半潮湿、半干旱的气候条件下,洪水流沉积特别发育,尤其是在河南省境内分布最广的上三叠统和上侏罗统地层中。周期性的洪水流沉积在沼泽和泥炭沼泽中反复出现,造成泥炭堆积时断时续,致使上三叠统及上侏罗统地层中的煤层层数甚多,但单层厚度薄,大多为不可采煤层的主要原因。可以认为洪水流沉积是聚煤作用最重要的破坏因素。  相似文献