Three years have elapsed since the synergetic development of the Beijing-Tianjin-Hebei(Jing-Jin-Ji)region was first put forward as a major national strategy by Chinese President Xi Jinping in February 2014.Xi called f...Three years have elapsed since the synergetic development of the Beijing-Tianjin-Hebei(Jing-Jin-Ji)region was first put forward as a major national strategy by Chinese President Xi Jinping in February 2014.Xi called for the coordination and integration of the economic zone surrounding Beijing.Now,a fledging Capital Economic Circle is taking shape.展开更多
In recent 20 years, there has been an increasing trend in the incidence of pancreatic cancer both at home and abroad. An estimated 31 860 new cases and 31 270 deaths are expected to occur in the United States in 2004 ...In recent 20 years, there has been an increasing trend in the incidence of pancreatic cancer both at home and abroad. An estimated 31 860 new cases and 31 270 deaths are expected to occur in the United States in 2004 due to this disease, the 4th and 5th leading cause of cancer death for men and women respectively. In China, new cases of pancreatic cancer continue to increase and are 6展开更多
After nearly one hundred years of research, metallurgy(metallurgical science and engineering) has gradually become a system with three levels of knowledge:(1) micro metallurgy at the atomic/molecular scale,(2) process...After nearly one hundred years of research, metallurgy(metallurgical science and engineering) has gradually become a system with three levels of knowledge:(1) micro metallurgy at the atomic/molecular scale,(2) process metallurgy at the procedure/device, and(3) macrodynamic metallurgy at the full process/process group. Macro-dynamic metallurgy development must eliminate the concept of an "isolated system" and establish concepts of "flow," "process network," and "operating program" to study the "structure–function–efficiency" in the macrodynamic operation of metallurgical manufacturing processes. It means considering "flow" as the ontology and observing dynamic change by"flow" to solve the green and intelligent potential of metallurgical enterprises. Metallurgical process engineering is integrated metallurgy, toplevel designed metallurgy, macro-dynamic operated metallurgy, and engineering science level metallurgy. Metallurgical process engineering is a cross-level, comprehensive, and integrated study of the macro-dynamic operation of manufacturing processes. Metallurgical process engineering studies the physical nature and constitutive characteristics of the dynamic operation of steel manufacturing process, as well as the analysis-optimization of the set of procedure functions, coordination-optimization of the set of procedures' relations, and reconstruction-optimization of the set of procedures in the manufacturing process. The study establishes rules for the macro operation of the manufacturing process, as well as dynamic and precise objectives of engineering design and production operation.展开更多
The logistics clusters are the result of concentration, scale and specialization of logistics activities, and their quantitative measurement and development evaluation provide an important foundation for improving the...The logistics clusters are the result of concentration, scale and specialization of logistics activities, and their quantitative measurement and development evaluation provide an important foundation for improving the land use efficiency and achieving economies of scale. Taking 289 cities at prefecture-level and above as research objects, this paper collected macro-statistical data of transport, postal and warehousing industry during 2000–2014, business registration data of more than 290 thousand logistics enterprises, and 170 thousand logistics points of interest(POI). With the integration of multi-index and multi-source data, the evolution process and spatial pattern of logistics clusters in China were explored with the methods of Location Quotient(LQ), Horizontal Cluster Location Quotient(HCLQ), Logistics Employment Density(LED) and modified Logistics Establishments' Participation(LEP). The development levels, types and modes of different logistics clusters were quantified. Several important findings are derived from the study.(1) The logistics clusters are mainly located on the east side of the Hu Huanyong Line, and the accumulative pattern evolves from group to block structure, featuring wide coverage and high concentration. The evolution of logistics clusters has two stages of rapid convergence and stable change, resulting in gradual increase in the development level and efficiency of logistics clusters and in emergence of spillover effect.(2) 21 mature logistics clusters are distributed in the core and sub-cities of the main metropolitan areas of 16 provincial-level administrative divisions, conforming to the government logistics and transport planning. 43 emerging logistics clusters are distributed in 21 provincial administrative divisions, and different types of cities have huge disparities which highlight the differentiation of the market behaviors and government planning among them.(3) The logistics clusters present differentiated development modes with the change of scales. In urban agglomerations scale, the nested "center-periphery" structures with "main nucleus-secondary cores-general nodes" are clarified. The polar nuclear development, networked and balanced development, single core and multipoint, multi-core multipoint hub-spoke development patterns are formed in different provincial administrative divisions.展开更多
文摘Three years have elapsed since the synergetic development of the Beijing-Tianjin-Hebei(Jing-Jin-Ji)region was first put forward as a major national strategy by Chinese President Xi Jinping in February 2014.Xi called for the coordination and integration of the economic zone surrounding Beijing.Now,a fledging Capital Economic Circle is taking shape.
文摘In recent 20 years, there has been an increasing trend in the incidence of pancreatic cancer both at home and abroad. An estimated 31 860 new cases and 31 270 deaths are expected to occur in the United States in 2004 due to this disease, the 4th and 5th leading cause of cancer death for men and women respectively. In China, new cases of pancreatic cancer continue to increase and are 6
文摘After nearly one hundred years of research, metallurgy(metallurgical science and engineering) has gradually become a system with three levels of knowledge:(1) micro metallurgy at the atomic/molecular scale,(2) process metallurgy at the procedure/device, and(3) macrodynamic metallurgy at the full process/process group. Macro-dynamic metallurgy development must eliminate the concept of an "isolated system" and establish concepts of "flow," "process network," and "operating program" to study the "structure–function–efficiency" in the macrodynamic operation of metallurgical manufacturing processes. It means considering "flow" as the ontology and observing dynamic change by"flow" to solve the green and intelligent potential of metallurgical enterprises. Metallurgical process engineering is integrated metallurgy, toplevel designed metallurgy, macro-dynamic operated metallurgy, and engineering science level metallurgy. Metallurgical process engineering is a cross-level, comprehensive, and integrated study of the macro-dynamic operation of manufacturing processes. Metallurgical process engineering studies the physical nature and constitutive characteristics of the dynamic operation of steel manufacturing process, as well as the analysis-optimization of the set of procedure functions, coordination-optimization of the set of procedures' relations, and reconstruction-optimization of the set of procedures in the manufacturing process. The study establishes rules for the macro operation of the manufacturing process, as well as dynamic and precise objectives of engineering design and production operation.
基金National Natural Science Foundation of China,No.71603219,No.41501123
文摘The logistics clusters are the result of concentration, scale and specialization of logistics activities, and their quantitative measurement and development evaluation provide an important foundation for improving the land use efficiency and achieving economies of scale. Taking 289 cities at prefecture-level and above as research objects, this paper collected macro-statistical data of transport, postal and warehousing industry during 2000–2014, business registration data of more than 290 thousand logistics enterprises, and 170 thousand logistics points of interest(POI). With the integration of multi-index and multi-source data, the evolution process and spatial pattern of logistics clusters in China were explored with the methods of Location Quotient(LQ), Horizontal Cluster Location Quotient(HCLQ), Logistics Employment Density(LED) and modified Logistics Establishments' Participation(LEP). The development levels, types and modes of different logistics clusters were quantified. Several important findings are derived from the study.(1) The logistics clusters are mainly located on the east side of the Hu Huanyong Line, and the accumulative pattern evolves from group to block structure, featuring wide coverage and high concentration. The evolution of logistics clusters has two stages of rapid convergence and stable change, resulting in gradual increase in the development level and efficiency of logistics clusters and in emergence of spillover effect.(2) 21 mature logistics clusters are distributed in the core and sub-cities of the main metropolitan areas of 16 provincial-level administrative divisions, conforming to the government logistics and transport planning. 43 emerging logistics clusters are distributed in 21 provincial administrative divisions, and different types of cities have huge disparities which highlight the differentiation of the market behaviors and government planning among them.(3) The logistics clusters present differentiated development modes with the change of scales. In urban agglomerations scale, the nested "center-periphery" structures with "main nucleus-secondary cores-general nodes" are clarified. The polar nuclear development, networked and balanced development, single core and multipoint, multi-core multipoint hub-spoke development patterns are formed in different provincial administrative divisions.