In this section , applying the method , from abstract to specific and from history to present , it analyzes the operation mechanism of urbanization economy affected by market mechanism ; puts forward four theories of urbanization economy from economic perspective , including agriculture surplus and comparison advantage ; non - agricultural industry ; agglomeration economy and spillover effect , on this basis of the theories , it , on one hand , analyzes two kinds of internal mechanism in the chronologic operation of urbanization economies : increasing mechanism of urbanization economies in urban output industry ; and changing mechanism from specialization to integration , which are the representations of the evolution of " mart " development ; on the other hand , it analyzes two internal mechanism of dimensional operation of urbanization economy : internal spatial enlargement mechanism of urbanization economies from monocentric city to multi - center city , and external spatial enhancement mechanism which represents city - regionalization and city - chain connection , the later two mechanism represent the evolution of " polis " development 这一部分，按照由抽象到具体和由历史到现代的研究方法，分析了市场机制作用下的城市化经济运行机理，从经济学角度提出了农业剩余与比较优势、非农产业、聚集经济、外溢效应四大城市化经济定理；在此基础上，一方面分析了城市化经济运行沿时间增长的两个内在内容提要机制:城市输出产业的城市化经济增长机制和从专业化到综合化的城市性质变迁机制，它们主要表现为“市”发展的延续;另一方面分析了城市化经济运行沿空间增长的两个内在机制:从单中心到多中心的城市化经济运行的内部空间扩展机理和表现为城市区域化、城市连绵体的城市化经济运行的外部空间扩展机理，它们主要表现为“城”发展的延续。
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The late ordovician - silurian - devonian - early carboniferous stratigraphic division and correlation , including the chronologic correlation of the donghe sandstone , which are the old great difficult key stratigraphic problems interfering with the development of the oil and gas exploration in the tarim basin , are synthetic studied by systematically applying chemobiostratigraphy . several important relevant stratigraphic boundaries are recognized , and the donghe sandstone is attributed to the frasnian , late devonian . the results of the study in particular proves that chemo - biostratigraphy has great significance and is a practical tool for high resolution stratigraphic division and correlation , especially for the region and or the bed with rare fossils 首次系统应用化学生物地层学对长期遗留的严重阻碍了油气勘探开发步伐的塔里木盆地重大疑难地层问题：晚奥陶世志留纪泥盆纪早石炭世地层划分对比和东河砂岩时代等进行了综合研究，厘定了几条重要的相关地层界线，并将东河砂岩的时代确定为泥盆纪晚泥盆世弗拉斯期。这些研究成果表明，化学生物地层学对高分辨率地层划分对比尤其是对在化石缺乏地区和层段进行地层划分对比工作有重要的意义和实用价值。
