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There are 110 papers published in subject: since this site started. |
Results per page: | 110 Total, 11 Pages | << First < Previous 8 9 10 11 |
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1. Geochemical features of Tertiary lacustrine algal reef in western Qaidam basin,China | |||
Zhong Jianhua,Wen Zhifeng,Li Yong,Wang Haiqiao | |||
Earth Science 15 November 2006 | |||
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Abstract:Abundant and widely distributed lacustrine reef reservoirs with extraordinary property and high reserve are discovered in western Qaidam basin. Herein, the reef in Qaidam basin are first studied in terms of Lipoid compound, Chain alkane, Cycloalkane, Amino acid and Kerogen, so as to illustrate the geochemical properties of the algal reef, and deduce some origin and environmental significance. The kerogen type of the algal reef are described and classified into four types according to its specific component. | |||
TO cite this article:Zhong Jianhua,Wen Zhifeng,Li Yong, et al. Geochemical features of Tertiary lacustrine algal reef in western Qaidam basin,China[OL].[15 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9574 |
2. Dating of the River Terraces in Eastern Qilian Shan, Northwest China | |||
Pan Baotian,Gao Hongshan,Li Jijun | |||
Earth Science 10 November 2006 | |||
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Abstract:The actively deformed foreland of eastern Qilian Shan (mountains) contains well-preserved geomorphic features such as river terraces and tectonically uplifted alluvial fans, providing suitable archives for research on regional tectonic activities and paleoclimatic changes. These geomorphic surfaces are well dated by using a combination of magnetostratigraphy, electron spin resonance (ESR), thermoluminescence (TL), infra-red stimulated luminescence (IRSL), radiocarbon dating, and correlation with the well-established loess-paleosol sequences of China. Our results show that the age of river terraces is 1.24 Ma, 820~870 ka, 780 ka, 420~440 ka, 230~250 ka, 140 ka, 60 ka and 10 ka, respectively. Repetitive stratigraphic and geomorphic pattern on these terraces indicate that climate variations play a significant role in controlling regional fluvial geomorphic evolution, even within this tectonic active regions. | |||
TO cite this article:Pan Baotian,Gao Hongshan,Li Jijun. Dating of the River Terraces in Eastern Qilian Shan, Northwest China[OL].[10 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9456 |
3. Influence of wave angle on irregular wave run- up | |||
Ji Wenwen,Yan Shichang,Chen Guoping | |||
Earth Science 20 October 2006 | |||
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Abstract:In the paper results of basic investigations on irregular wave run-up with special regard to oblique wave approach is analyzed. To investigate the influence of angle of wave attack on irregular wave run- up,physical model experiments has been performed in the wave basin of Jiangning campus of Hohai University. More than 250 groups of experiment have been carried out. Each group of experiments has been made two times to reduce error. The influence factor rβ has been set out against the angle of wave attack, β . | |||
TO cite this article:Ji Wenwen,Yan Shichang,Chen Guoping. Influence of wave angle on irregular wave run- up[OL].[20 October 2006] http://en.paper.edu.cn/en_releasepaper/content/8849 |
4. Using GIS to Perform Seismic Hazard Analysis | |||
ZHANG Baoyi | |||
Earth Science 10 April 2006 | |||
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Abstract:The main characteristics of GIS, general procedures of probabilistic seismic hazard analysis and the method to realize them on MapGIS are described. A computerized application on an engineering site in the Three Gorges Dam District is presented. The graphical user interface introduced by GIS enables to handle PSHA software routines and data in a more intuitive way. Moreover, it improves the user’s capacity of cognizing the complex PSHA processing, and helps user to explore the knowledge of PSHA from geo-data. | |||
TO cite this article:ZHANG Baoyi. Using GIS to Perform Seismic Hazard Analysis[J]. |
5. Visibility Comparisons over the Horizontal Path by Lidar and Visibility Meter | |||
Sun Zhaobin,Guo Jinjia,Liu Zhishen,Ma Sen,Liu Zhen | |||
Earth Science 10 February 2006 | |||
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Abstract:Abstract: As a new tool to detect atmosphere, 1idar can derive the value of visibility by directly collecting the scattered laser from the atmosphere. It makes lidar become a main instrument for measuring visibility in the future.Simultaneous measurements of atmosphere visibility by Micro-pulsed lidar and visibility meter NQ-1 have been performed to validate the feasibility of MPL systems designed by Ocean Remote Sensing Laboratory ,Ocean University Of China, from October 21 2005 to November 21 2005 in ShiLaoRen Tour Garden in Qingdao . This paper summarizes the characters of the lidar system and the comparison results. | |||
TO cite this article:Sun Zhaobin,Guo Jinjia,Liu Zhishen, et al. Visibility Comparisons over the Horizontal Path by Lidar and Visibility Meter[OL].[10 February 2006] http://en.paper.edu.cn/en_releasepaper/content/5193 |
6. A Model for the Wumishan Cycle and Their Vertical Stacking Patterns: Cyclic Sedimentation Genetically Related to Milankovitch Cycles in the Precambrian | |||
Mei Mingxiang,Zhou Hongrui,Du Benming,Luo Zhiqing | |||
Earth Science 19 December 2005 | |||
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Abstract: Carbonate strata of the Meso-Proterozoic Wumishan Formation in the Jixian area near Tianjin are ~3300 m thick and were deposited over some 100 million years (from ~1310±20 Ma to ~1207±10 Ma). Metre-scale cycles (parasequences) dominate the succession. They are generally of the peritidal carbonate type, and mostly show an approximately symmetrical lithofacies succession with thin stromatolite biostromes and small thrombolite bioherms constituting the central part and tidal-flat dolomites forming the upper and lower parts. Lagoonal dolomitic shales with palaeosoil caps make up the topmost layers. The boundaries of the Wumishan cycles are typically exposure surfaces, and there is abundant evidence for fresh-water diagenesis. Widespread 1:4 stacking patterns indicate that the individual Wumishan cycles are sixth-order parasequences, with 4 parasequences constituting one fifth-order parasequence set. Locally, 5-8 seventh-order beds or couplets, can be discerned in some of the cycles. The regular vertical stacking pattern of seventh-order beds within the sixth-order parasequences, forming the fifth-order parasequence sets, are interpreted as the result of environmental fluctuations controlled by Milankovitch rhythms, namely the superimposition of precession, and short and long-eccentricity. The widespread 1:4 stacking pattern in the cyclic succession, as well as the local 1:5-8 stacking patterns of the beds within the cycles, suggest that the Milankovitch rhythms had similar ratios in the Meso-Proterozoic as in the Phanerozoic. Based on the cycle stacking patterns, 26 third-order sequences can be distinguished and these group into 6 second-order, transgressive-regressive megasequences, all reflecting a composite, hierarchical succession of sea-level changes. | |||
TO cite this article:Mei Mingxiang,Zhou Hongrui,Du Benming, et al. A Model for the Wumishan Cycle and Their Vertical Stacking Patterns: Cyclic Sedimentation Genetically Related to Milankovitch Cycles in the Precambrian[OL].[19 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4458 |
7. POPULATION-DRIVEN URBAN EXPANSION MODELING: CASE STUDY | |||
Li Lin,Zhu Haihong | |||
Earth Science 06 December 2005 | |||
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Abstract:Urban expansion, as a dynamic process of land use change, may be linked with topography, transportation, land use, social structure and economic type, but it is generally related to demography and economy in a city. According to a physical diffusion process, population density is regarded as an internal driving factor for urban expansion. We will discuss methods to calculate population density based on statistical data and examine characteristics of urban expansion modeling based on population through two examples. On a regional scale, an approximate rank-size-rule may be applied to allocate the aggregated population data because of quite a lot of disconnected built-up areas in this region. At local scale, a negative exponential function may be used to distribute the total number of people of a city over its built-up areas, most of which are nearly connected with each other. | |||
TO cite this article:Li Lin,Zhu Haihong. POPULATION-DRIVEN URBAN EXPANSION MODELING: CASE STUDY[OL].[ 6 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4105 |
8. DEM-based Watershed Topographic Attributes Extraction and Analysis | |||
Yuan Lifeng,Zhang Youshui | |||
Earth Science 03 November 2005 | |||
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Abstract:n this paper we took Yan’er Gully watershed for an analysis instance, using ArcGIS software as a digital terrain analysis tool for studying topographic attributes extraction and analysis methods based on grid DEMs. The spatial and statistical distribution of topographic attributes were computed and compared. We assumed that a relative real DEM which is consistent with natural land surface can be produced through reconditioning basic material generated DEM and reprocessing DEM. We used mathematic statistics method and comparative analysis method to analyze effect of DEMs with different resolutions on the outcome of topographic terrain extraction, including elevation, slope, topographic index (i.e. ln (α/tan β)), watershed and subwatershed area, and drainage network. The analysis results of effect of DEM with different resolution on topographic attributes derived form DEMs indicated that terrain is smoothed, the mean value of slope decreases, the mean value of ln(α/tanβ) distribution i | |||
TO cite this article:Yuan Lifeng,Zhang Youshui. DEM-based Watershed Topographic Attributes Extraction and Analysis[OL].[ 3 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3488 |
9. Methane Hydrates and Future Climate | |||
Li Fangxing,Zunfeng Liu,Dongpoing Liu,Ruimin Sun,Jun Chen | |||
Earth Science 31 October 2005 | |||
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Abstract:The formation and release of methane hydrates, an important way of carbon cycle which follows a certain rule, has led to glacial-interglacial climate cycles. But up till now, no model can satisfactorily consistent explain the influence of methane hydrates cycle on the glacial-interglacial climate cycles. In this paper, a model is built to explain how this process works. As we all know, for life to continue, carbon must be recycled. The formation of coal and oil decreased the amount of cycling carbon, while the formation and release of methane hydrates can ensure the carbon cycle to proceed; therefore, we don’t have to worry about the increase in the atmospheric concentration of CO2. | |||
TO cite this article:Li Fangxing,Zunfeng Liu,Dongpoing Liu, et al. Methane Hydrates and Future Climate[OL].[31 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3414 |
10. The characteristic of tsp prediction | |||
He Xianqi,Zhu Ziqiang | |||
Earth Science 15 August 2005 | |||
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Abstract:Multi-component seismic exploration record both p-waves and shear waves,or s-waves,so it can get more information of the subsurface than convention seismic exploration.Tsp is a method of three-componet seismic survey system. it can be continuously used as an accompanying measure to the tunneling construction. | |||
TO cite this article:He Xianqi,Zhu Ziqiang. The characteristic of tsp prediction[OL].[15 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2660 |
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