检索结果-南通市图书馆

中国科学院地质与地球物理研究所2.03学术年会

作者： Mingguo Zhai~*,Wenjun Liu Key laboratory of Mineral Resources,Institute of Geology & Geophysics,Chinese Academy of Sciences,Beijing 10002.,china

The continental crust of the North china craton(NCC) is considered to have formed largely by the end of the Neoarchaean, with only local Proterozoic igneous and sedimeniary activity *** metamorphic events are widespread and rocks within localised mobile zones,including the Liaoji Belt in NE china,the Fengzhen Belt in the northwestern NCC and the Jinyü Belt in the centralwestern *** in intracratonic or continental margin settings at ca.2.50-1970 *** rocks underwent amphibolite to granulite fades *** were intruded by granites at *** important Palaeoproterozoic tectonothermal event occurred at ca.1900-1800 *** in a strong metamorphic and geochronological record in almost all earlier Precambrian rocks in the *** event is traditionally named the Lüliang {2. and has previously been considered to mark carbonisation of the *** was closely followed at ca. 1800-1650 Ma by a period of continental rifting and anorogenic magmatic *** the rifts,volcano-sedimentary rocks of the Changcheng and Xiong’er Systems overlie earlier Precambrian basement,accompanied by coeval anorogenic magmatism including gabbro-anorthosite-rapikivi *** dyke swarms of this age are also widely distributed in the NCC and these are characterised by enriched mantleεNd(T) *** researchers consider that the 1900-1800 Ma metamorphic event represents continental collision,with the 1800-1650 Ma rifting event involving subsequent ***,other workers have suggested that they represent a single event related to Palaeo-Mesoproterozoic mantle upwelling and supercontinent *** also exists as to whether high-pressure granulite to retrogade eclogite facies metamorphism in the NCC was Neoarchaean or Palaeoproterozoic in *** favour carbonisation of the NCC at ca.2.00 *** by its involvement in a global pre-Rodinian supercontinent at ca.2.00 *** important Lülia

关键词： Palaeoproterozoic crustal evolution North china craton

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

Powder Forging of a Motorcycle Connecting Rod

引用

Journal of Materials Science & Technology 2002年第6期18卷 544-548页

作者： Guangchun WANG and Guoqun ZHAOMold & Die Engineering Technology Research Center, Shandong University (Southern campus), Jinan 2.0061, china Die Eng. Technol. Res. Cent. Shandong Univ. Ji'nan 250061 China

A motorcycle connecting rod is one of the major moving parts affecting the engine performance. The traditional manufacturing process results in material waste and excessive machining. A new method of hot forging P/M has been proposed and studied experimentally. In order to achieve uniform density, the punch was divided into three parts to consolidate the loose powder. The multistage movement of the three parts of the punch, called synchronous compaction, results in the desired uniform density. Powder flow during consolidation was illustrated and the density distribution of the compacts was measured. A set of forging dies with flash was used to produce densification and deformation of the sintered compact. Then a set of flashless forging dies was designed to obtain the desired shape and dimensions of the connecting rod. The effects of forging temperature and initial compact density on densification were evaluated through hot forging experiments. Based on properties achieved, Fe-C-Cu-Mo was selected as the

关键词： Powder metallurgy Connecting rod Powder forging

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spatial distribution analysis of landslides triggered by 2.08.5.12.Wenchuan Earthquake,china

Spatial distribution analysis of landslides triggered by 200...

引用

中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Shengwen Qi~(a,b,*),Qiang Xu~b,Hengxing Lan~c,Bing Zhang~d,Jianyou Liu~(a,1) a Key Lab.of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,china,P.O.Box 982.,Chaoyang area,Beijing,10002.,china b State Key Lab.of Geo-hazard Prevention and Geo-environment Protection,Chengdu University of Technology,Chengdu,610059,china c State Key laboratory of Resources and Environmental System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,100101,china d Centre for Earth observation and Digital Earth,Chinese Academy of Sciences,Beijing,100190,china

The 2.08.5.12.Wenchuan Earthquake(seismic magnitude M 7.9 according to the USGS)triggered a great number of landslides.A spatial database of landslides is built by interpreting the remote sensing(RS)data which covers 11 counties severely damaged by the earthquake with area of about 31,686.12.*** geological settings of the study area are detailed mapped including geologic structure and *** digital elevation model(DEM)of the study area with resolution of 30 m×30 m is presented to address the topographic *** between the occurrence of landslides with geological settings i.e. active faults(the coseismic surface ruptures),geological unit,slope gradient,slope elevation as well as slope aspect are analyzed using spatial modeling in GIS with the aids of field *** can be concluded that the distance to the causative faults and slope gradient are much more important than other factors. Landslides are clustered distributed along the causative faults of F2.and F3,and landslides incidence are dramatically decreasing with the increasing of the distance to the causative *** landslides incidence has an obvious increase near the active faults *** concentration(LC,landslides/km)has an obvious exponent increase with slope ***,LC has no obvious relationship with geological unit and slope elevation;the difference of LC value in each geological unit(each slope elevation category)maybe have been the result affected by slope gradient for each geological unit(each slope elevation category)and distance of each geological unit(each slope elevation category)to causative fault *** map reflects the incidence of landslides in some degree,and LC increases dramatically with Intensity increasing, almost all landslides occurred in the region aboveⅥdegree. Statistics result also indicates that in the near field of causative faults,landslides tend to have the initial sliding direction similar to the {4.

关键词： 2.08.5.12.Wenchuan Earthquake Slope Landslide Spatial analysis

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

Numerical simulation of fluctuation and undulation of the thermo-cline under tide (tidal current) action in the Bohai Sea

引用

Acta Oceanologica Sinica 1993年第3期12卷 347-357页

作者： Zhang Yanting and Wang Yijiao First Institute of Oceanography, State Oceanic Administration, Qingdao 2.6003, china

Besides seasonal variation, instantaneous variation of thermal layer will occur under the effects of tide, tidal current and wind disturbance. In this study the numerical simulation has been first carried out on fluctuation and undulation of thermal layer under influence of tide (simultaneous input of 8 tidal components). The study reveals the geographic distribution of thermal layer fluctuation in the entire study region and temporal and spatial variations of the undulation in tidal period superposing on the fluctuation. Especially, the wave with large amplitude simulated is consistent with observation in the channal and the sea areas with a convex coastline and complex variation of depth, internal relations of tide, tidal current, residual current as well as the factors such as geography, and the fluctuation of thermal layer is induced by residual current due to unsymmetry which occurs as a result of the tidal movement in lower layer influenced by friction and geography, meanwhile, analysis indicates that the fluctuation of thermal layer and tidal oscillation are different undulations in character.

关键词： line In action in the Bohai Sea Numerical simulation of fluctuation and undulation of the thermo-cline under tide tidal current

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

徐州台体积式应变仪和弦频式钻孔应变仪观测资料的对比分析

引用

华北地震科学 1989年第1期7卷 52-57页

作者：陈沅俊杨修信国家地震局地壳应力研究所

本文从理论上推导了处于同一地点的体积式应变仪与弦频式钻孔应变仪测值之间的关系。进而对徐州台安装在同一个山洞、不同钻孔内的体积式应变仪和弦频式钻孔应变仪的实测值进行了相关分折。结果表明,二者相关性很好,与理论计算的结果基... 详细信息

本文从理论上推导了处于同一地点的体积式应变仪与弦频式钻孔应变仪测值之间的关系。进而对徐州台安装在同一个山洞、不同钻孔内的体积式应变仪和弦频式钻孔应变仪的实测值进行了相关分折。结果表明,二者相关性很好,与理论计算的结果基本一致。最后,对造成两者比例因子差异的原因进行了简略分析。

关键词：钻孔应变仪体应变观测观测资料比例因子基准台固体潮理论值潮汐应变地震前兆对比分析观测值

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FEASIBLE STUDY ON THE INTEGRATION SYSTEM FOR THE SPACE MONITORING OF MAJOR EARTHQUAKES AND VOLCANOES IN TERRESTRIAL LAND

引用

Chinese Geographical Science 2002年第4期12卷 350-353页

作者： BO Li-qun(Changchun Institute of Geography,t he Chinese Academy of Sciences,Changchun 130012.P.R.china) Changchun Institute of Geography the Chinese Academy of Sciences Changchun P. R. China

With the rapid development of space technology,earth observation tech nology and sky observatory technolo-gy,they have played a more and more im portant part in monitoring and predi cting of earthquakes and volcanoes i n the terres-trial *** recent years,the rela ted agencies have done the experimen ts and researches on monitoring and p redicting of earthquakes and volcanoes in the forewarning period by means of many appr oaches,such as satellite thermal in frared re-mote sensing(TIRS),Global Positioning System(GPS),differential interferometric syn thesis aperture radar(D-INSAR),astronomical time-latitude residual anomaly,and Geographic Information Systems (GIS),etc.A quite large number of re-search foundation has been built in t he fundamental theories and applica tion *** experiments and re searches have shown that these technology is e fficient methods for high frequency crust *** the existed separate scientific forces and results are possibly asse mbled together to form a more complete integration monitoring system wit h the combina-tion of space,sky observation,grou nd,deep geology and macro anomaly,i t will come into a new stage of monitoring and predicting of earthquakes and volca nic eruptions.

关键词： space technology integration system earthquake and volcano

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

低能量激光治疗腰棘上韧带和棘间韧带损伤的临床疗效观察

引用

体育科学 2000年第5期20卷 58-59,62页

作者：江海燕于发景谷国良北京医科大学第2.床医学院人民医院针炙康复理疗科北京100044 北京医科大学第2.床医学院人民医院骨关节中心北京100044

用半导体激光仪所发生的低能量激光对 32.棘上韧带和棘间韧带同时损伤的病人进行了治疗。病人的平均年龄是 39.31± 1 .5 3岁 ,平均病程是 93.5 9± 2.2..73天 ,78.1 3%的病人都是在体育活动中受伤。以 1 0度疼痛评分法结合腰部运动和... 详细信息

用半导体激光仪所发生的低能量激光对 32.棘上韧带和棘间韧带同时损伤的病人进行了治疗。病人的平均年龄是 39.31± 1 .5 3岁 ,平均病程是 93.5 9± 2.2..73天 ,78.1 3%的病人都是在体育活动中受伤。以 1 0度疼痛评分法结合腰部运动和局部按压作为疗效评定标准。经过平均 7.38± 0 .5 6次的治疗后 ,痊愈率是 5 0 % ,显效率是 31 .3% ,有效率是 1 5 .6 % ,无效率是 3.1 %。总有效率是 96 .9%。本临床观察发现 ,激光治疗棘上韧带和棘间韧带损伤具有有效率高、平均治疗次数少、见效快的特点 ,是治疗此类软组织运动创伤的较好方法之一。

关键词：韧带损伤激光理疗

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

耿村煤矿综放开采覆岩移动和矿压显现规律研究

引用

河南理工大学学报（自然科学版） 2018年第4期37卷 1-8页

作者：翟新献孙乐乾涂兴子李如波卢德芳河南理工大学能源科学与工程学院河南焦作454000 平顶山天安煤业股份有限公司开拓处河南平顶山467000 河南大有能源股份有限公司耿村煤矿河南义马472300

厚煤层综放开采矿山压力和围岩控制一直是综放开采研究的重点问题。基于义马矿区耿村煤矿特厚煤层综放工作面的地质采矿条件,采用数值模拟和现场矿压观测的方法,对综放工作面覆岩移动和矿压显现规律进行研究。结果表明:(1)综放工作面上... 详细信息

厚煤层综放开采矿山压力和围岩控制一直是综放开采研究的重点问题。基于义马矿区耿村煤矿特厚煤层综放工作面的地质采矿条件,采用数值模拟和现场矿压观测的方法,对综放工作面覆岩移动和矿压显现规律进行研究。结果表明:(1)综放工作面上方老顶形成"三铰拱"形砌体结构,该结构初次失稳和周期性失稳造成工作面初次来压和周期来压。老顶来压后,工作面前方支承压力趋于稳定,主要表现在最大应力集中系数和塑性区范围基本保持不变。(2.综放工作面顶板周期来压步距14.4.17.5 m,平均16.2.m,顶板来压动载系数1.81~2.04.平均1.92.顶板来压明显但较缓和。顶板来压期间支架时间加权平均工作阻力为其额定工作阻力的72.2.,选用ZF8600/18/35D型放顶煤液压支架合理。研究结果可为义马矿区综放开采围岩控制提供技术支撑。

关键词：特厚煤层综放开采矿压显现覆岩变形移动

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cost Reference Particle Filter Based on Adaptive Particle Swarm Optimization in observation Uncertainty

Cost Reference Particle Filter Based on Adaptive Particle Sw...

引用

第三十届中国控制会议

作者： HU Zhen-Tao,LIU Xian-Xing~*,JIN Yong laboratory of Image Processing & Pattern Recognition,Henan University,Kaifeng 4.5001,Henan,P.R.china

＜正＞Aiming at the effective approximation of sampling particle set relative to system state in observation uncertainty,a novel cost reference particle filter based on adaptive particle swarm optimization is *** the new algorithm,the cost function and the risk function are firstly introduced to realize reasonable utilization of the latest *** addition, according to the prior modeling information,a new adaptive method is given to solve the selection of limit *** then the movement of particle set towards the region of high weight particle is completed by particle swarm optimization *** algorithm realizes the dynamic combination of the cost reference particle filter and the adaptive particle swarm optimization,and the reliability and stabilize of sampling particle set relative to system state are *** theoretical analysis and experimental results show the efficiency of the proposed algorithm.

关键词： Nonlinear Filter Cost Reference Particle Filter Particle Swarm Optimization observation Uncertainty

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

Inorganic chemical composition and source signature of PM2.5 in Beijing during ACE-Asia period

引用

Science Bulletin 2003年第10期48卷 1002-1005页

作者： ZHANG Renjian, XU Yongfu & HAN Zhiwei LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 10002., china LAPC Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Aerosol samples for PM2.5 were collected in Beijing for 38 consecutive days from March to April 2.01 using an IMPROVE Sampler. Concentrations of 2. elements in PM2.5 were determined using a PIXE method. Results show that the average mineral dust concentration of PM2.5 was 14.6 mg/m3 during the observation period. On the sand-dust event days of March 2. and April 10, dust PM2.5 mass concentrations were 62.4.and 54.1 mg/m3, respectively. These demonstrate that fine particle pollution by dust event in Beijing was very severe. The enrichment factors of S and Cu reached minimums on the dusty days and were high on the non-dusty days. It is considered that enrichment factors of elements in PM2.5, which are associated with human activities, can probably provide an effective method to distinguish local sources from external sources of dust. Factor analysis on the chemical composition in PM2.5 shows that sources of crustal matters, anthropogenic emission, and oil combustion contributed to PM2.5 levels in air in the springtime of 2.01 in Beijing.

关键词： dust ACE-Asia PM2.5 chemical composition source apportionment.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：