检索结果-南通市图书馆

Complexity and Self-Organized Criticality of Solid Earth System(Ⅰ)

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1998年第1期17卷 30-47页

作者： Yu Chongwen faculty of Earth Sciences, china university of geosciences, wuhan 43.074

The author puts forward the proposition of Complexity and Self Organized Criticality of Solid Earth System in the light of: (1) the science of complexity studies the mechanisms of emergence of complexity and is the science of the 21st century, (2) the study of complexity of the earth system would be one of the growing points occupying a strategic position in the development of geosciences in the 21st century. By the proposition we try to cogitate from a new viewpoint the ancient yet ever new solid earth system. The author abstracts the fundamental problem of the solid earth system from the essence of the generalized geological systems and processes which reads: the complexity and self organized criticality of the global nature, structure and dynamical behavior of the whole solid earth system emerging from the multiple coupling and superposition of non linear interactions among the multicomponents of the earths material and the multiple generalized geological (geological, geophysical, and geochemical) processes . Starting from this cognizance the author proposes eight major themes and the methodology of researches on the complexity and self organized criticality of the solid earth system.

关键词： complexity self organization self organized criticality the solid earth system fractal chaos long range spatio temporal correlation fractal spatio temporal structure.

同方期刊数据库

An Analysis of Groundwater in Sinjar Plain (Northwest of Iraq) Using WQI Model

在线全文

学校读者我要写书评

暂无评论

Journal of china university of geosciences 2001年第4期12卷 291-295页

作者： Bassam F Al Bassam Ayad M Fadhil faculty of Earth resources , china university of geosciences , wuhan 43.074 faculty of Earth resources China University of Geosciences Wuhan 430074

Sinjar plain-northwest Iraq has an abundant amount of groundwater. Due to the importance of this water source, the water quality index (WQI) model was used in the classification of groundwater in the western and eastern regions of Sinjar plain for beneficial use. Groundwater samples were chemically analyzed to calculate the values of WQI. This model consists of a single number of the integrated deviation from standard quality, which indicates the relative importance of each relevant variable for beneficial use. The results indicate that the WQI could be used to determine the particular uses of groundwater. The groundwater in the Sinjar plain is more suitable for irrigation than for livestock drinking and domestic use.

关键词： water quality index Sinjar plain groundwater classification.

Metallogenic Districts of Yangtze Cratonic Rim at the Edge of Chaos

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1999年第1期18卷 5-11页

作者： Yu Chongwen faculty of Earth Sciences, china university of geosciences, wuhan 43.074

Combining the science of complexity with ore geology, the author puts forward a new theory of metallogenesis: “complexity and self organized criticality of metallogenic dynamic systems”, and three fundamental theories are raised for it. The ore genesis and regularity of ore formation of four metallogenic districts around the Yangtze craton in china are studied with this theory. It is found that “metallogenic districts of Yangtze cratonic rim are all at the edge of chaos”. This proposition is expounded by four determinative criteria of the edge of chaos for metallogenic districts of Yangtze cratonic rim.

关键词： self organized criticality (SOC) edge of chaos power law fractal structure soliton supercritical geofluid spatio temporal chaos.

Fractal Features and Computer Simulation of Fan-Shaped Sedimentary Bodies in Faulted Basins

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1998年第3期17卷 50-51页

作者： Zhou Jiangyu Guangzhou Institute of Geochemistry, chinese Academy of Sciences, Guangzhou 510640 Wu Chonglong faculty of Earth resources, china university of geosciences, wuhan 43.074

Ｆａｎ－ｓｈａｐｅｄｓｅｄｉｍｅｎｔａｒｙｂｏｄｉｅｓａｒｅｔｈｏｓｅｍａｉｎｌｙｃｏｍ－ｐｏｓｅｄｏｆｔｅｒｉｇｅｎｏｕｓｃｏａｒｓｅｄｅｐｏｓｉｔｓａｎｄｂｅｉｎｇｆａｎ－ｓｈａｐｅｄｉｎｍｏｒｐｈｏｌｏｇｙ，ｉ... 详细信息

Ｆａｎ－ｓｈａｐｅｄｓｅｄｉｍｅｎｔａｒｙｂｏｄｉｅｓａｒｅｔｈｏｓｅｍａｉｎｌｙｃｏｍ－ｐｏｓｅｄｏｆｔｅｒｉｇｅｎｏｕｓｃｏａｒｓｅｄｅｐｏｓｉｔｓａｎｄｂｅｉｎｇｆａｎ－ｓｈａｐｅｄｉｎｍｏｒｐｈｏｌｏｇｙ，ｉｎｃｌｕｄｉｎｇａｌｕｖｉａｌｆａ...

关键词： fan shaped sedimentary body nonlinear dynamics fractal fractal dimension kriging numerical simulation fault basin.

Carbon isotope composition of the Lower Triassic marine carbonates, Lower Yangtze Region, South china

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2006年第3期49卷 225-241页

作者： ZUO Jingxun1,2, TONG Jinnan3, QIU Haiou4 & ZHAO Laishi3 1. Nanjing Institute of Geology and Palaeontology, chinese Academy of Sciences, Nanjing 210008, china 2. Henan Institute of Geological Survey, Zhengzhou 450007, china 3. State Key Laboratory of Geological Processes and Mineral resources at china university of geosciences, wuhan 43.074, china 4. faculty of Material Sciences and Chemical Engineering, china university of geosciences, wuhan 43.074, china 1. Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China 2. Henan Institute of Geological Survey Zhengzhou 450007 China 3. State Key Laboratory of Geological Processes and Mineral resources at china university of geosciences Wuhan 430074 China 4. faculty of Material Sciences and Chemical Engineering China University of Geosciences Wuhan 430074 China

Studies on three Lower Triassic sections located on the shallow water platform, the deep water slope and in the deep water basin in the Lower Yangtze Region, South china, show the similar trend of carbon isotope evolution. Biostratigraphic correlations among the Lower Triassic sections on the basis of standard conodont zones indicate that three negative shifts occurred in the Griesbachian, the Smithian and the late Spathian stages respectively, and one distinctly positive shift occurred in the early Spathian stage. Trend of carbon isotope evolution of the Lower Triassic reflects some significant changes in the global carbon cycle. Moreover, δ 13C background values are intensively controlled by palaeogeographic environment. In general, δ 13C values from deep-water slope carbonates are lighter than those from carbonate platform and heavier than those from deep-water basin carbonates. The positive carbon isotope excursion may be induced by a significant amount of organic carbon burial in marine sediments and increase in primary productivity. The large negative carbon isotope excursions during the Early Triassic in Lower Yangtze Region are interpreted to relate to volcano eruptions based on tuffaceous claystone interlayers observed near the Permian-Triassic boundary, the Induan- Olenekian boundary and the Lower Triassic-Middle Triassic boundary.

关键词： Lower Triassic, carbon isotope compositions, palaeogeography, volcanic eruptions, Lower Yangtze Region.

Optimum Design of Highway Excavation Slope Angle: Evidence from Dawu Section of Jingzhu Highway

在线全文

学校读者我要写书评

暂无评论

Journal of china university of geosciences 2001年第3期12卷 258-260页

作者： Hu XinliEngineering faculty, china university of geosciences, wuhan 43.074 Construction Engineering faculty, Jilin university, Changchun 130026Tang HuimingEngineering faculty, china university of geosciences, wuhan 43.074 Engineering faculty China University of Geosciences Wuhan 430074 Engineering faculty China University of Geosciences Wuhan 430074 Construction Engineering faculty Jilin University Changchun 130026

The optimum design of the highway excavation slope angle is one of the most important problems to the highway construction and to the slope improvement. The Dawu Section of Jingzhu (Beijing Zhuhai) Highway is taken as an example to illustrate the study method for excavation slope angle design. The analysis of the engineering condition from different angles with different factors shows that the stability of the slope is calculated by using residual pushing force and the Sarma method. Then the sensitive analysis of the slope stability is conducted by using residual pushing force method. Finally, the optimum angle of design is presented on the precondition of ensuring the whole stability of slope and the economic reasonability. The study results show that the most sensitive factors are the shear strength parameter and the seismic force, and that the optimum excavation slope angle is 60°.

关键词： the most dangerous sliding plane stability evaluation sensitive analysis optimum design angle of slope.

Three Dimensional Modeling of Effect of India-Eurasia Collision

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1997年第1期16卷 90-94页

作者： Zeng Zuoxun faculty of Earth Sciences, china university of geosciences, wuhan 43.074 Li Sitian Yang Shigong faculty of Earth resources, china university of geosciences, wuhan 43.074Liu Lilin Fu Yongtao faculty of Earth Sciences, china Univers

The progressive extrusion model proposed by Tapponnier for the effect of IndiaEurasia collision is modified by taking threedimensional deformation and preexisting faults into account. Through model analysis, the possibility is discussed in this paper that the collision causes the inversion of TanchengLujiang faults and Red River fault from leftlateral slip to rightlateral slip, triggers the extension of the sedimentary basins producing oil and gas such as Bohaiwan basin and Yinggehai basin in Cenozoic era, and induces clockwise rotation of Southeast Asia.

关键词： IndiaEurasia collision TanchengLujiang fault Red River fault Bohaiwan basin Yinggehai basin model analysis.

Characteristics of the Bottom Boundary(T11) of Late Cretaceous Yaojia Formation in Songliao Basin and Its Dynamic Background

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 141-142页

作者： Ying Song~(1,2),Jianye Ren~3,Huaizhong Yang~2 1.Key Laboratory of Tectonics and Petroleum resources(china university of geosciences),Ministry of Education,wuhan 43.074,china. 2.faculty of Earth resources,china university of geosciences(wuhan),wuhan 43.074,china 3.Structural Research Center of Oil&Gas Bearing Basin,Ministry of Education,Branch Center in china university of geosciences,wuhan 43.074,china

Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE china provide a unique oppor- tunity both for building the terrestrial type stage of Cretaceous in china and for studying the response of Cretaceous major global geological *** basin had undergone three stages of tectonic evolution during the Late Jurassic and Cretaceous:syn-rifting phase,post-rifting thermal subsidence phase and basin inversion *** shallow strata of Yaojia Formation contain excellent Putaohua and Sartu reservoir rocks,which contribute great to the giant

关键词： Songliao Basin tectonic inversion responding surface tectonic revolution

Study on optimization of iron-based matrix formula for hot pressed diamond bit

在线全文

学校读者我要写书评

暂无评论

金刚石与磨料磨具工程 2008年第S1期28卷 156-160页

作者： Yang Yang Pan Bingsuo (faculty of Engineering,china university of geosciences,wuhan 43.074,china)

A new type of iron-based matrix formula as a potential substitute for traditional WC-based matrix formula for hot pressed diamond bit was ***,phosphor-iron,663-Cu,nickel,cobalt and certain additives were selected as the studied formula *** matrix performances,the hardness and wear resistance were chosen as experimental indexes in this *** uniform design method was used for the formula design of iron-based *** forms of regression models of matrix hardness and wear resistance were obtained by regression analysis using ***,the optimization of matrix formulae and matrix performances were also achieved through constrained nonlinear *** was found that matrix hardness,significantly affected by the factor of Ni-Co-additives and Fe,increased with the increment of Ni-Co-additives,Fe and P-Fe,but reduced with the increase of *** the other hand,matrix wear resistance is mainly affected by Fe;the effect of the interaction between Fe and P-Fe is also relatively obvious. The increment of 663-Cu powder may result in a slight improvement in matrix wear *** addition,the results of nonlinear programming revealed that the predictive optimum value of hardness was 139.5 HRB and the optimum wear resistance was 0.056 g,whereas they could not reach the optimum value at the same time.

关键词： formula optimization stepwise regression P-Fe alloy matrix performance