检索结果-南通市图书馆

Pattern Recognition of Thermal Analysis Cooling Curves and Quality Evaluation of Melt Cast Alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2001年第1期17卷 73-74页

作者： Yanxiang LI Xiao HU Xuerong XU Dept.of Mechanical Eng. Tsinghua UniversityBeijing 100084China

The development of thermal analysis techniques for evaluation of cast alloy melt quality and its current applications in the foundry were reviewed. The characteristics of the current thermal analysis techniques were analyzed. A new comprehensive method for cooling curve recognition has been proposed. The evaluation of cast alloy melt quality was realized.

关键词： Quality Evaluation Cooling Curves thermal analysis cooling curve recognition comprehensive method alloy melt

Study on the severest real ground motion for seismic design and analysis

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2003年第3期16卷 260-271页

作者：谢礼立翟长海 School of Civil Engineering and Architecture Harbin Institute of TechnologyHarbin 150090China Institute of Engineering MechanicsChina Seismological BureauHarbin 150080China School of Civil Engineering and Architecture Harbin Institute of TechnologyHarbin 150090China

How to select the adequate real strong earthquake ground motion for seismic analysis and design of structures is an essential problem in earthquake engineering research and practice. In the paper the concept of the severest design ground motion is proposed and a method is developed for comparing the severity of the recorded strong ground motions. By using this method the severest earthquake ground motions are selected out as seismic inputs to the structures to be designed from a database that consists of more than five thousand significant strong ground motion records collected over the world. The selected severest ground motions are very likely to be able to drive the structures to their critical response and thereby result in the highest damage potential. It is noted that for different structures with different predominant natural periods and at different sites where structures are located the severest design ground motions are usually different. Finally, two examples are illustrated to demonstrate the rationality of the concept and the reliability of the selected design motion.

关键词： the severest design ground motion parameters of ground motion database of ground motion damage potential of strong ground motion comprehensive method

Quantitative data about active tectonics and possible locations of strong earthquakes in the future in the northwestern Beijing

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2001年第5期14卷 534-546页

作者： RAN Yong-kang Institute of Geology China Seismological Bureau Beijing China

Deterministic, probabilistic and composite-grading methods are used to get the possible locations of strong earthquakes in the future in Northwest Beijing and its vicinity based on the quantitative data and their accuracy about active tectonics in the research area and by ordering, some questions in the results are also discussed. It shows that the most dangerous fault segments for strong earthquakes in the future include: segments B and A of the southern boundary fault of the Yangyuan basin, the southern boundary fault of the Xuanhua basin, the east segment of the southern Huai'an fault and the east segment of the northern Yanggao-Tianzhen fault. The most dangerous area is Yangyuan-Shenjing basin, the second one is Tianzhen-Huai'an-Xuanhua basin and the third dangerous area are Wanquan-Zhangjiakou and northeast of Yuxian to southwest of Fanshan.

关键词： comprehensive method Locations of strong earthquakes Northwestern Beijing Quantitative data of active tectonics

comprehensive Geophysical Prospecting methods For Marine Oil-gas Resources and Their Application in Chinese Sea Regions

在线全文

学校读者我要写书评

暂无评论

Comprehensive Geophysical Prospecting Methods For Marine Oil...

中国科学院地质与地球物理研究所2002学术年会

作者： Hao Tianyao~a,Zhu Zhenhai~b,Huang Xiaoxia~b,Song Haibin~a,Jiang Weiwei~a a.Institute of Geology and Geophysics,Chinese Academy of Sciences.Beijing,100101,China b.Institute of Remote Sensing Application,Chinese Academy of Sciences,Beijing,100101,China

The remote sensing anomaly and magnetic anomaly from seepage of oil-gas have been *** processing for SAR and AV data,the distribution of oil slick from seepage can be defined in marine *** research on China seas shows that the remote sensing anomaly of oil slick is correlative with oil-gas *** MBS(magnetic bright spot) result in the Bohai sea and comprehensive interpretation result from"integrated anomalies"show closed relationship with oil-gas fields.

关键词： remote sensing comprehensive method seepage of oil-gas

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

减少混凝土单位水泥用量综合措施的研究

福州大学学报(自然科学版) 1985年第1期 147-154页

作者：朱千祥福州大学土建系

减少混凝土单位水泥用量，不但能降低工程造价，而且也能改善混凝土性质，特别可简化大体积工程施工工艺，防止混凝土结构出现裂缝．本文主要介绍在满足某一大工程质量要求的条件下，采用多种的综合措施，进行反复试验研究，提出如何减... 详细信息

减少混凝土单位水泥用量，不但能降低工程造价，而且也能改善混凝土性质，特别可简化大体积工程施工工艺，防止混凝土结构出现裂缝．本文主要介绍在满足某一大工程质量要求的条件下，采用多种的综合措施，进行反复试验研究，提出如何减少混凝土单位水泥用量的综合方法，这些方法既能满足工程技术要求，又能达到把混凝土单位水泥用量降低到最优水平。

关键词： comprehensive method MASS CONCRETE ENGINEERING

20世纪90年代湖北省经济发展的地域差异分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论