THE EFFECT OF THE LONG WAVE OVER THE NORTHERN HEMISPHERE ON TYPHOON TRACKS OVER THE NORTHWESTERN PACIFIC     

Ding Yihui  Hu Jian  Wang Zhilie 《Acta Meteorologica Sinica》1989,3(3):395-407

The normal typhoon paths with 109 cases during the period from 1960 to 1979 have been analysed in this study.These paths are divided into 7 categories.The effect of the position and intensity of largescale wave on each category has been examined.It has been discovered,as a result,that this effect is rather evident.On the other hand,the teleconnection between different centers of anion does exist.A simple theoretical analysis indicates that the teleconnection is related to the propagation of wave energy.Thus,to predict comectly typhoon path,not only the steering flow of typhoon,but also,more significantly,the behavior of large-scale wave over the Northern Hemisphere must be taken into consideration.  相似文献   

含裂隙介质受压破裂前地震波特性的综合实验研究与理论分析          下载免费PDF全文

丁伯阳 《地震工程学报》1984,6(S1):21-33

本文用单轴压缩下砂岩试件的P、s波超声实验,对含裂隙高空度砂岩破裂前的Vp、Vs、Vp/Vs、Ap、As、As/Ap,初动段频谱,介质传递函数作了一系列实验研究。结果表明:l.Vp、Vs及Vp/Vs的变化同花岗岩,2.As/Ap要发生变化,3.有低频增加现象,4.介质传递函数发生变化,5.有第二P波产生。最后文章用两相介质中地宸波传播理论对实验结果作了定量分析。  相似文献   

江汉油田烃类微渗漏蚀变信息及提取机理     

王云鹏  丁暄  何在成 《遥感学报》1993,(4)

本文围绕烃类微渗漏造成地表土壤蚀变的褪红、粘土矿化和碳酸盐化等3项标志,在江汉油田进行了相关的地球化学信息和光谱信息研究。在研究土壤成分特征的基础上,提出了反映3项蚀变标志的成分因子;在研究土壤光谱特征的基础上,提出了与蚀变成分因子相关的TM波段比值因子;在成分因子及TM波段比值因子的统计分析基础上,探索从室内土壤光谱数据中提取和烃类微渗漏蚀变相关的信息,并为图像特征信息提取奠定了基础。  相似文献   

基于数据挖掘探析经方治疗晚期肺癌的辨治规律          下载免费PDF全文

赵鼎  刘杰  马金凤 《应用海洋学学报》2024,40(2):37

目的：探讨经方治疗晚期肺癌的辨治规律及处方用药。方法：收集中国知网（CNKI）中运用经方治疗晚期肺癌的病案,通过Medcase V5.2仓公诊籍国医脉案数据记录挖掘系统,运用频数分析与关联规则分析,从临床症状、舌象、脉象、病机、处方用药等多方面对经方治疗晚期肺癌的病案进行数据挖掘。结果：晚期肺癌的主要临床表现有咳嗽、疲倦乏力、食欲不振、胸闷、易醒、入睡困难等;频数较高的舌象有舌质暗红、舌质红、舌质淡红、舌质淡、苔薄白、苔黄腻;频数较高的脉象有细、弦、滑、沉、数、弱;病机主要为癌毒郁肺、肺脾气虚、肺失宣肃、肝郁化火、痰热壅肺、水饮停肺;常用药物有茯苓、法半夏、炙甘草、大枣、桂枝、柴胡等;通过关联规则分析,得到30组关联症状、28组关联病机、30组病机与临床症状关联。结论：应用数据挖掘法能够反映经方治疗晚期肺癌的辨治规律,具有一定的临床指导意义。  相似文献   

Comparison of particle size characteristics of the Tertiary 'red clay' and Pleistocene loess in the Chinese Loess Plateau: implications for origin and sources of the 'red clay'   总被引：7，自引：0，他引：7  

S. L. Yang  Z. L. Ding 《Sedimentology》2004,51(1):77-93

The origin of the Tertiary ‘red clay’ underlying the Pleistocene loess in the Chinese Loess Plateau remains controversial, although several lines of evidence have suggested a wind‐blown origin. This study examines the particle‐size parameters of the late Miocene and Pliocene ‘red clay’ by comparing it with those of the late Pleistocene loess. The particle‐size distribution of a total of 15 339 loess and 6394 ‘red clay’ samples taken from 12 loess sections along a north–south transect and two ‘red clay’ sequences at Lingtai and Jingchuan was systematically analysed. The median grain size, skewness and kurtosis of the late Pleistocene loess all show a systematic southward change and are principally influenced by distance from source region. The spatial and temporal differentiation of dust deposits is expressed in a skewness–kurtosis–median grain size ternary diagram, from which the distance to the source region can be inferred. The particle‐size characteristics of the Tertiary ‘red clay’ sediments are very similar to those of the palaeosols within the late Pleistocene loess deposits, suggesting an aeolian origin for the ‘red clay’. Based on the comparison of ‘red clay’ and loess in the ternary diagrams, it is inferred that the source–sink distance was greater in the Neogene than in the last and penultimate interglacials, and that the dust source region in north‐western China underwent a progressive expansion during the period from at least 7·0 Ma to the present.  相似文献   

Geomagnetic diurnal-variation anomalies and their relation to strong earthquakes     

Ding Jian-hai  Liu Jie  Yu Su-rong  Xiao Wu-jun 《地震学报(英文版)》2004,17(1):85-93

The diurnal-variation anomalies of the vertical-component in geomagnetic field are mainly the changes of phase and amplitude before strong earthquakes. On the basis of data recorded by the network of geomagnetic observatories in China for many years, the anomalous features of appearance time of the minima of diurnal variations (i.e, low-point time) of the geomagnetic vertical components and the variation of their spatial distribution (i.e, phenomena of low-point displacement) have been studied before over 30 strong earthquakes with M _S≥6.6 such as Kunlunshan M _S=8.1 earthquake on November 14, 2001; Bachu-Jashi M _S=6.8 earthquake on February 24, 2003; Xiaojin M _S=6.6 earthquake on September 22, 1989, etc. There are good relations between such rare phenomena of geomagnetic anomalies and the occurrence of earthquakes. It has been found that most earthquakes occur in the vicinity of the boundary line of sudden change of the low-point displacement and generally within four days before and after the 27th or 41st day counting from the day of appearance of the anomaly. In addition, the anomalies of diurnal-variation amplitude near the epicentral area have been also studied before Kunlunshan M _S=8.1 earthquake and Bachu-Jiashi M _S=6.8 earthquake. Foundation item: National Science Technology Tackle Key Project during the Tenth Five-year Plan (2001BA601B01-05-04)  相似文献   

Realistic Modeling of Seismic Wave Ground Motion in Beijing City   总被引：5，自引：0，他引：5  

Z. Ding  F. Romanelli  Y. T. Chen  G. F. Panza 《Pure and Applied Geophysics》2004,161(5-6):1093-1106

— Algorithms for the calculation of synthetic seismograms in laterally heterogeneous anelastic media have been applied to model the ground motion in Beijing City. The synthetic signals are compared with the few available seismic recordings (1998, Zhangbei earthquake) and with the distribution of observed macroseismic intensity (1976, Tangshan earthquake). The synthetic three-component seismograms have been computed for the Xiji area and Beijing City. The numerical results show that the thick Tertiary and Quaternary sediments are responsible for the severe amplification of the seismic ground motion. Such a result is well correlated with the abnormally high macroseismic intensity zone in the Xiji area associated with the 1976 Tangshan earthquake as well as with the ground motion recorded in Beijing city in the wake of the 1998 Zhangbei earthquake.  相似文献   

长江三角洲地区近实时GPS气象网   总被引：7，自引：3，他引：7  

丁金才  叶其欣 《气象》2003,29(6):26-29

简述了GPS气象学的发展动态和长江三角洲地区GPS气象网的概况，着重介绍了如何解决计算方法和设备、通信系统、产品实时演示系统和系统准业务化管理等问题，实现GPS气象网的近实时运转。  相似文献   

中国地震台网、全球地震台网地震目录数据库和震相数据库     

王科英  邹立晔  梁建宏  任克新  邱海江  丁秋琴  刘敬光 《地震地磁观测与研究》2003,24(3):37-43

地震目录和震相数据在地震学研究中具有重要意义，本文介绍了中国地震台网、全球地震台网地震目录数据库和震相数据库的内容和查询使用方法。  相似文献   

青藏高原东西向伸展及其地质意义   总被引：30，自引：4，他引：30  

张进江  丁林 《地质科学》2003,38(2):179-189

东西和南北向伸展是青藏高原最显著的地质特征之一。南北向伸展形成的东西走向伸展构造,主要包括藏南拆离系(STDS),和沿喀喇昆仑—嘉黎断裂带(KJFZ)发育的正断层体系。东西向伸展形成数目众多的南北走向伸展构造,它们切割青藏高原几乎所有的东西走向构造单元,包括羌塘地块、KJFZ和STDS等,说明东西向伸展以整体形式发生并同时波及整个青藏高原,而不是由以KJFZ和STDS为边界的不同地块的不均匀挤出所致。南北走向伸展构造在地表呈之字形,为南北向挤压形成的追踪张断裂;剖面上表现为被后期高角度正断层叠加的拆离断层,拆离断层形成于中-晚中新世而高角度正断层形成于上新世及以后。导致拆离断层的东西向伸展可能是南北向挤压的变形分解,后期高角度正断层作用可能是高原隆升后的垮塌所致。东西向伸展是控制青藏高原新生代浅色花岗岩和盆地形成的主要因素。  相似文献