近30年中国天气预报业务进展   总被引：8，自引：0，他引：8  

李泽椿  毕宝贵  朱彤  王友恒  牛若芸 《气象》2004,30(12):4-10

介绍了我国天气预报技术的发展现状，指出在大气探测技术、数值预报及可视化技术发展的推动下我国传统的天气预报向定量、定时方向发展，并系统阐述了天气预报业务发展过程和存在的问题，最后提出了对我国天气预报业务发展的思路。  相似文献   

714CD雷达资料在短时灾害天气预报中的应用          下载免费PDF全文

牛淑贞  张素芬 《气象》1997,23(12):29-33

作者总结了１９９４－１９９６年７１４ＣＤ雷达观测资料在河南省短时生大灾害性天气预报中的应用。着重分析了多普勒速率场上的中尺度天气系统，图像特征以及与短时暴雨，强对流天气的对应，并归纳出短时预报技术流程。  相似文献   

High-rate precise point positioning (PPP) to measure seismic wave motions: an experimental comparison of GPS PPP with inertial measurement units   总被引：2，自引：1，他引：1  

Peiliang Xu  Chuang Shi  Rongxin Fang  Jingnan Liu  Xiaoji Niu  Quan Zhang  Takashi Yanagidani 《Journal of Geodesy》2013,87(4):361-372

High-rate GPS has been widely used to construct displacement waveforms and to invert for source parameters of earthquakes. Almost all works on internal and external evaluation of high-rate GPS accuracy are based on GPS relative positioning. We build an experimental platform to externally evaluate the accuracy of 50-Hz PPP displacement waveforms. Since the shake table allows motion in any of six degrees of freedom, we install an inertial measurement unit (IMU) to measure the attitude of the platform and transform the IMU displacements into the GPS coordinate system. The experimental results have shown that high-rate PPP can produce absolute horizontal displacement waveforms at the accuracy of 2–4 mm and absolute vertical displacement waveforms at the sub-centimeter level of accuracy within a short period of time. The significance of the experiments indicates that high-rate PPP is capable of detecting absolute seismic displacement waveforms at the same high accuracy as GPS relative positioning techniques, but requires no fixed datum station. We have also found a small scaling error of IMU and a small time offset of misalignment between high-rate PPP and IMU displacement waveforms by comparing the amplitudes of and cross-correlating both the displacement waveforms.  相似文献   

Thermoluminescence in response to the mass extinction event in Penglaitan Section in Laibin,Guangxi     

CHEN GuiFan  HU ChaoYong  LI Niu  YI ZhenHui 《中国科学:地球科学(英文版)》2013,(8):1350-1356

Thermoluminescence(TL)in marine carbonate has been proposed as a potential proxy for reconstruction of paleoceanography history,and has already been used in defining the Quaternary environment.However,its availability in the geological time scale,such as Permian,is still on debate.The mass extinction event caused by drastic changes of global marine environment in Middle-Late Permian provides a typical example to testify the applicability of this proxy.Here we measured the natural thermoluminescence of the carbonate-dominating marine sediments collected from the strata through the Guadalupian-Lopingian mass extinction boundary(G/LB)in the Penglaitan Section in Laibin,Guangxi,China.Our results reveal that TL intensities of carbonate are much higher than those of siliceous rocks,which indicates that the carbonate is the main contributor to the TL.The variation of TL intensities are related with Mn and Fe contents in the carbonate lattices while high Mn and low Fe(e.g.,high Mn/Fe ratio)in carbonate will release stronger TL.Due to the better storage of carbonate lattices for original information of Mn and Fe in seawater,thermoluminescence of carbonate-dominating sediments/rocks could sensitively reflect marine environment and biological productivity in geological time scale.  相似文献   

沂源县房地产用地情况的调查分析     

牛绪民 《山东国土资源》2006,22(9):26-27

为推进土地市场化建设，全面准确地分析、评估当前房地产用地形势，沂源县国土资源局组成专项调查队伍，在短时间内对2004，2005年度沂源县辖区内房地产（商业、住宅）开发用地的数量质量、供应管理和投资销售等进行了一次综合性专项调查。调查中主动与建设、规划、计划、统计、房管等有关部门衔接，采取现场实地调研、电话咨询、与购买客户座谈等方式多渠道获取资讯，确保调查数据和调查结果的准确性、完整性。通过调查摸清了沂源县房地产用地市场价格趋势和市场供需状况，为政府宏观调控房地产市场，制定土地供应计划提供了重要依据，对于稳定房地产市场，促进经济社会发展打下了坚实基础。  相似文献   

A STUDY ON RELATION BETWEEN CONTINUOUS RAPID DEFORMATION AND EARTHQUAKES     

Niu Anfu  Zhang Jing  Gao Fuwang  Ji Ping  Yah Xudong 《大地测量与地球动力学》2003,23(Z1)

Continuous Rapid Deformation (CRD) may be an important precursor before some strong earthquakes with magnitude greater than MsS. 0. This paper shows some characteristics of CRD, and proposes a method for identifying precursory CRD that is closely related to the process of earthquake preparation. From the deformation data in Yunnan-Sichan provinces, we obtained the tilt and strain thresholds of 4.5ms/d and 5 × 10-7/d, respectively. Compared the tilt CRD in this region before 9 earthquakes (short-term fore-shocks and after-shocks not included) with magnitude greater than 5.8 in the period from January of 1990 to May of 2001, we found that 8 earthquakes occurred within 5 months after the CRD with a duration of more than 20 days and a tilt velocity of more than 4. 5ms/d without false prediction, but with one failure in earthquake prediction. For the strain CRD, 5 earthquakes occurred after the CRD; there was no false prediction, but 4 earthquakes unpredicted. We have tried to increase the thresholds, but found either the failure ratio or the rate of false prediction increased, while the success rate not obvious increased.  相似文献   

伽师地震与区域断层活动研究   总被引：1，自引：1，他引：0  

牛安福  王琪  江在森  张晶  延旭东 《大地测量与地球动力学》2003,23(1):17-21

利用GPS、连续倾斜和地震活动性资料分析了伽师地区构造活动的特点和伽师强震群的动力背景，结果表明：在印度洋板块的挤压下，塔里木盆地的右旋腑冲运动是造成南天山区地震活动的主要原因；1996年3月19日伽师阿图什6．7级地震，强烈地影响了该地区块体由向西南倾斜转向北向倾斜，并可能成为诱伽师地区强震群活动的主要动力因素，利用1998年和1999年对该地区GPS测量的结果，给出了该地区断层活动的水平。  相似文献   

Guest Editorial     

Rongxing Li  Xutong Niu 《Marine Geodesy》2007,30(1):1-2

  相似文献   

Migratory Waterbirds Response to Coastal Habitat Changes: Conservation Implications from Long-term Detection in the Chongming Dongtan Wetlands,China     

Ye-Ai Zou  Chen-Dong Tang  Jun-Ying Niu  Tian-Hou Wang  Yong-Hong Xie  Hao Guo 《Estuaries and Coasts》2016,39(1):273-286

  相似文献   

Temperature sensitivity thresholds to warming and cooling in phenophases of alpine plants     

Fandong Meng  Yang Zhou  Shiping Wang  Jichuang Duan  Zhenhua Zhang  Haishan Niu  Lili Jiang  Shujuan Cui  Xin’e Li  Caiyun Luo  Lrirong Zhang  Qi Wang  Xiaoying Bao  Tsechoe Dorji  Yingnian Li  Mingyuan Du  Xinquan Zhao  Liang Zhao  Guojie Wang  David W. Inouye 《Climatic change》2016,139(3-4):579-590

  相似文献