检索结果-南通市图书馆

A Systematic Retrospective Study on earthquake Cases of Reported Rredictions in china

在线全文

学校读者我要写书评

暂无评论

A Systematic Retrospective Study on Earthquake Cases of Repo...

Cleaning of Chromate Manufacture Process

中国地球物理学会第二十六届年会、中国地震学会第十三次学术大会

作者： Qifu Chen institute of earthquake science,china earthquake administration,beijing 100036

In china,earthquake prediction is a government - sanctioned and law - regulated measure of disaster prevention since the 1966 Xingtai *** than 20 earthquakes were reportedly to be predicted in some form in china(Yue,2... 详细信息

关键词： A Systematic Retrospective Study on earthquake Cases of Reported Rredictions in china

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2000年第2期14卷 132-134页

作者： Xing Zou Yi Zhang(Applied science School, University of science and Technology beijing, beijing 100083, china)(institute of Engineering Chemistry and Metallurgy, chinese Academy of sciences, beijing 100080, china) Applied science School University of Science and Technology Beijing Beijing 100083 China institute of Engineering Chemistry and Metallurgy Chinese Academy of Sciences Beijing 100080 China

Sodium chromate solubility is determined in the range of NaOH concentrations from 450 to 810 g/L andsolution temperatUres from 30 to 110℃. The optimized conditions to separate sodium chromate from NaOH inleached solution are resolved. It is first found the method to efficiently separate sbdium chromate from NaOH andsodium altuninate in crude sodium chromate. Bench-scale studies on the separating are performed. Finally, goodseparation results are achieved.

关键词： chromate separation clean process

Geophysical survey on the tectonic and sediment distribution of Qinghai Lake basin

在线全文

学校读者我要写书评

暂无评论

science china Earth sciences 2006年第8期49卷 851-861页

作者： AN Zhisheng1, WANG Ping2, SHEN Ji3, ZHANG Yixiang2, ZHANG Peizhen4, WANG Sumin3, LI Xiaoqiang1, SUN Qianli1, SONG Yougui1, AI Li1, ZHANG Yechun2, JIANG Shaoren2, LIU Xingqi3 & WANG Yong31. institute of Earth Environment, chinese Academy of sciences (CAS), Xi’an 710075, china 2. South china Sea institute of Oceanology, CAS, Guangzhou 510301, china 3. Nanjing institute of Geography and Limnology, CAS, Nanjing 210008, china 4. institute of Geology, china earthquake administration, beijing 100029, china 1. institute of Earth Environment Chinese Academy of Sciences (CAS) Xi’an 710075 China 2. South china Sea institute of Oceanology CAS Guangzhou 510301 China 3. Nanjing institute of Geography and Limnology CAS Nanjing 210008 China 4. institute of Geology China Earthquake Administration Beijing 100029 China

The intensive geophysical survey of Qinghai Lake reveals the buried depth of lake sediments and their distribution features. The result indicates that there are three important inter- phases of Qinghai Lake sediments: T1 is the rife interphase of the lake, above which sediments are spread all over the lake basin with roughly the same thickness; T5 is the interphase from which the neotectonic sedimentary cycle begins, and its above sedimentary environment is relatively stable; Tg is the base of the lake basin. Five west-northwest (WNW) fault belts defined the tectonic structure of Qinghai Lake basin: the central hunch around Haixin Shan with two subbasins both in its north and south. The thickness of the lake sediments varies at different places, the thickest sediments are found within the two subbasins. According to the depth that the Sparker System can reach, sediment in the northern subbasin is deeper than 560 m, while sediment in the southern subbasin is deeper than 700 m. The correlation between the seismic sequence stratigraph and the lithology of onshore core shows that Qinghai Lake sediments consist of muddy silt, clay silt, silty clay, gravel silty clay, etc.

关键词： sediment, geophysical survey, Qinghai Lake.

Relationship between the Asian-Pacific oscillation and the tropical cyclone frequency in the western North Pacific

在线全文

学校读者我要写书评

暂无评论

science china Earth sciences 2008年第3期51卷 380-385页

作者： ZHOU BoTao1, CUI Xuan2 & ZHAO Ping3 1 Laboratory for Climate Studies, National Climate Center, china Meteorological administration, beijing 100081, china 2 National Meteorological Center, china Meteorological administration, beijing 100081, china 3 chinese Academy of Meteorological sciences, china Meteorological administration, beijing 100081, china 1. Laboratory for Climate Studies National Climate Center China Meteorological Administration Beijing 100081 China 2. National Meteorological Center China Meteorological Administration Beijing 100081 China 3. chinese Academy of Meteorological sciences China Meteorological Administration Beijing 100081 China

The relationship between the Asian-Pacific oscillation (APO) and the tropical cyclone frequency over the western North Pacific (WNP) in summer is preliminarily investigated through an analysis of ob- served data. The result has shown clearly that APO is significantly and positively correlated to the tropical cyclone frequency in the WNP. If APO is above (below) the normal in summer, more (less) tropical cyclones will tend to appear in the WNP. The present study also addresses the large-scale at- mospheric general circulation changes underlying the linkage between APO and the WNP tropical cy- clone frequency. It follows that a positive phase of summer APO is concurrent with weakened as well as northward and eastward located western Pacific subtropical high (WPSH), low-level convergence and high-level divergence, and reduced vertical zonal wind shear in the WNP, providing favorable envi- ronment for the tropical cyclone genesis, and thus more tropical cyclones will come into being, and vice versa.

关键词： Asian-Pacific oscillation western North Pacific tropical cyclone atmospheric circulation

On the origin of movable metal-type technique

在线全文

学校读者我要写书评

暂无评论

chinese science Bulletin 1998年第20期43卷 1681-1692页

作者： PAN Jixing institute for History of science, chinese Academy of sciences, beijing 100010, china institute for History of science Chinese Academy of Sciences Beijing China

china is the birthplace of woodblock, copperplate and non metal_type printing, movable metal_type technique, as the product of combination of copperplate and non metal_type technique, also originated in china. However, the problem on the origin of metal_type has not well been solved for a long time. This paper proved that metal_type was cast and used for paper money printing in china since the early 12th century, copper_type and tin_type technique was further developed during the 13th to 14th centuries, on the basis of investigation of excavated findings, textual research and scientific judgment. Finally a comparative research of the early metal_type technique in china, Korea and Europe was briefly discussed. A lot of unearthed material evidence were provided here.

关键词： china origin copperplate copper_type tin_type Song_Jin Yuan Ming.

Thresholds of geographic environmental elements in sediment yield of drainage basins

在线全文

学校读者我要写书评

暂无评论

science china Earth sciences 2005年第2期48卷 230-240页

作者： CHEN Hao, ZHOU Jinxing, CAI Qiangguo, LU Zhongchen & LI Zhongyan institute of Geographic sciences and Natural Resources Research, chinese Academy of sciences, beijing 100101, china institute of Forestry science, chinese Academy of Forestry science, beijing 100091, china Research Center for Eco-Environment sciences, chinese Academy of sciences, beijing 100085, china Computing institute of science and Engineering, North china Electric Power University, beijing 102206, china 1. institute of Geographic sciences and Natural Resources Research Chinese Academy of Sciences 100101 Beijing China 2. institute of Forestry science Chinese Academy of Forestry Science 100091 Beijing China 3. Research Center for Eco-Environment sciences Chinese Academy of Sciences 100085 Beijing China 4. Computing institute of science and Engineering North China Electric Power University 102206 Beijing China

Threshold of environmental elements in drainage basin sediment yield refers to, under effect of climate, underlying surface and human activity, a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics. Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements. Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today. Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions. Based on single element analysis, the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant, polynomial formula regression analysis.

关键词： middle Yellow River, environmental element, sediment, sediment delivery mudule, threshold.

Multiple time scale evaluation of the energy balance during the maize growing season,and a new reason for energy imbalance

在线全文

学校读者我要写书评

暂无评论

science china Earth sciences 2009年第1期52卷 108-117页

作者： GUO JianXia1,2,BIAN LinGen3 & DAI YongJiu2 1 Meteorological Observation Center of china Meteorological administration,beijing 100081,china 2 State Key Laboratory of Remote Sensing science,School of Geography and Remote Sensing science,beijing Normal University,beijing 100875,china 3 chinese Academy of Meteorological sciences,beijing 100081,china Meteorological Observation Center of china Meteorological administration Beijing 100081 China State Key Laboratory of Remote Sensing science School of Geography and Remote Sensing Science Beijing Normal University Beijing 100875 China

Energy imbalance is a common problem associated with the measurement of surface energy using the eddy covariance *** the evaluation of the energy balance,people usually pay more attention to the statistical result that the effective energy(the sum of sensible and latent heat) is systematically lower than the available energy(the difference of net radiation and ground heat flux).However,little attention has been paid to the existence of the reversed situation when the effective energy is larger than the available energy or their contribution to the overall energy closure *** this paper,based on the analysis of the energy balance on multiple time scales across the maize growth season,we conclude that the non-synchronization of energy components is the main reason for the existence of the reversed *** shifting the phase of the effective energy components half an hour ahead,the rates of energy closure over all time scales are improved and dramatically reduce the number of the half-hourly samples when the energy ratio exceeds 1 or is below *** to the characteristics of the energy distribution and transformation over multiple time scales,latent heat is always the main type of energy cost,and the residual of the energy balance increases with the growth of the maize plant surpassing the sensible heat for seventy *** is suggested that the heat storage and photosynthetic energy play an important role in the energy balance during the growing period of maize.

关键词： maize energy balance multiple time scale energy hysteresis

PROBABILISTIC NUMERICAL APPROACH FOR PDE AND ITS APPLICATION IN THE VALUATION OF EUROPEAN OPTIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2001年第6期19卷 591-600页

作者： Dong-sheng Wu (institute of Systems science, Academy of Mathematics and Systems sciences, chinese Academy of sciences, beijing 100080, china ) 中科院系统科学所北京 100080

Presents a probabilistic numerical approach for a class of probabilistic differential equation. Application of the Brownian motion and Monte-Carlo method; Application in the valuation of European Options.

关键词： Brownian motion probabilistic numerical solution European Options

Sea surface temperature east of Australia:A predictor of tropical cyclone frequency over the western North Pacific?

在线全文

学校读者我要写书评

暂无评论

chinese science Bulletin 2011年第2期56卷 196-201页

作者： ZHOU BoTao 1,2 & CUI Xuan 3 1 National Climate Center,china Meteorological administration,beijing 100081,china 2 Nansen-Zhu International Research Center,institute of Atmospheric Physics,chinese Academy of sciences,beijing 100029,china 3 National Meteorological Center,china Meteorological administration,beijing 100081,china National Climate Center China Meteorological Administration Beijing China Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China National Meteorological Center China Meteorological Administration Beijing China

The relationship between sea surface temperature (SST) east of Australia and tropical cyclone frequency over the western North Pacific (WNPTCF) is analyzed by use of observation *** WNPTCF from June to October is correlated negatively to spring SST east of *** the spring SST is in the positive phase,a cyclonic circulation anomaly in the upper troposphere and an anticyclonic circulation anomaly in the lower troposphere prevail over the western North Pacific from June to October,concurrent with an anomalous atmospheric subsidence and an enlarged vertical zonal wind *** conditions are unfavorable for tropical cyclone genesis,and thus WNPTCF *** negative phase of the spring SST east of Australia leads to more tropical cyclones over the western North *** spring SST east of Australia may give rise to simultaneous change in tropical atmospheric circulation via the teleconnection wave train,and then subsequently affect atmospheric circulation variation over the western North Pacific.

关键词：热带气旋北太平洋澳大利亚西部海面温度热带大气环流预测频率