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煤炭工业多种经营发展趋势与战略选择 被引量:3
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作者 胡予红 《煤炭经济研究》 北大核心 2001年第9期69-70,75,共3页
关键词 煤炭工业 多种经营 中国 第三产生 高新技术 煤炭企业 工业结构 煤系共伴矿物
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Recalculating the Significance of Secondary and Tertiary Industries for Industrial Restructuring: Truth and Myth
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作者 李钢 廖建辉 向奕霓 《China Economist》 2012年第3期28-38,共11页
By analyzing the efficiency, supply and demand of the three industries, and the foreign trade of developed countries, this paper argues: the ever-increasing proportion of the tertiary industry in developed countries ... By analyzing the efficiency, supply and demand of the three industries, and the foreign trade of developed countries, this paper argues: the ever-increasing proportion of the tertiary industry in developed countries has not yetproved that tertiary industry is the direction of industrial advance nor the tertiary industry is superior over the secondary industry. By estimating China's industrial structure with PPP-based industrial data, this paper argues that the proportion of China's secondary industry in its GDP is not as high as expected. China will still rely on its secondary industry for further growth because China's labor-intensive industries still possess the most comparative advantage and global competitiveness. 展开更多
关键词 industrial upgrading industrial structure COMPETITIVENESS
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Geobiological processes of the formation of lacustrine source rock in Paleogene 被引量:12
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作者 LI GuoShan WANG YongBiao +4 位作者 LU ZongSheng LIAO Wei SONG GuoQi WANG XueJun XU XingYou 《Science China Earth Sciences》 SCIE EI CAS 2014年第5期976-987,共12页
Gypsum-salt rocks and coccolith calcareous shale are widely deposited in the lower part of the Paleogene Shahejie Formation in the Dongying Sag, Sbandong Province. The gypsum-salt rock is believed to be formed during ... Gypsum-salt rocks and coccolith calcareous shale are widely deposited in the lower part of the Paleogene Shahejie Formation in the Dongying Sag, Sbandong Province. The gypsum-salt rock is believed to be formed during the earlier deposition in salt lake, while the overlying coccolith shale in saline lake with relatively low salinity. By comparing the lake environment and la- custrine microbial communities between ancient and recent lakes, cyanobacteria are regarded as the main representative of productivity during the formation of gypsum-salt strata series, with the annual productivity of 1500-2000 gC m-2 yr1. Based on the research of ultramicrofossils in the calcareous shale, coccolith is considered as the main contributor to the productivity during the formation of calcareous shale. On the basis of statistic data of sedimentary rates, shale laminations, and coccolith fossils in each lamination, the quantitative value of productivity is calculated, with the annual productivity of 2250 3810 gC m 2 yr-1 (averagely 3120 gC m-2 yr-1). Statistic data of large amount of pyrite framboids indicate that the lower water col- umn was persistently in sulfidic or anoxic conditions during the deposition of gypsum-salt strata series, but it changed to be dysoxic when the coccolith calcareous shale was deposited. Both of these water conditions are favorable for the preservation of organic matter. It is estimated that the organic carbon burial efficiency of the Lower Paleogene salt lakes and saline lakes of Dongying Depression is about 10%-15%, which is calculated and analyzed using the multi-parameter geobiological model. 展开更多
关键词 source rock GEOBIOLOGY paleo-oxygenation facies PALEOGENE Dongying Sag
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