Recently the Erlitou Archaeological Team, IA, CASS, has given the priority of their field work to research into the settlement pattern of the Erlitou site. Through more than four years of systematic survey, drilling a...Recently the Erlitou Archaeological Team, IA, CASS, has given the priority of their field work to research into the settlement pattern of the Erlitou site. Through more than four years of systematic survey, drilling and selective excavation, with the previous achievements in field archaeology combined, they have got further understanding on the structure, layout and other problems of the site.The present paper makes a systematic discussion on the limits, present conditions and mini-environments of the site, as well as its general layout, the road network in the central area, the distribution of the vestiges in the palace-city and the evolution of the settlement.展开更多
中国高速铁路网将由时速≮250 km 铁路客运专线网和时速≮200 km 铁路提速线路组成。借鉴国外高速铁路代表作的技术格局,结合中国国情、路情,中国高速铁路的自主技术体系初步形成,站前技术已经取得全面突破,站后技术创新工作已经进入重...中国高速铁路网将由时速≮250 km 铁路客运专线网和时速≮200 km 铁路提速线路组成。借鉴国外高速铁路代表作的技术格局,结合中国国情、路情,中国高速铁路的自主技术体系初步形成,站前技术已经取得全面突破,站后技术创新工作已经进入重点突破阶段。透视时速300～350 km 客运专线,中国高速铁路关键技术主要包括运输组织、工务基础设施、牵引供电系统、通信、信号、信息化及动车组等方面内容,要着力解决好无碴轨道、轮轨关系、列车运行控制系统、轨下基础工后沉降控制等重大技术,有效利用资源,创新技术管理手段,采取强有力的技术保障措施,取得中国高速铁路关键技术的全面突破。展开更多
文摘Recently the Erlitou Archaeological Team, IA, CASS, has given the priority of their field work to research into the settlement pattern of the Erlitou site. Through more than four years of systematic survey, drilling and selective excavation, with the previous achievements in field archaeology combined, they have got further understanding on the structure, layout and other problems of the site.The present paper makes a systematic discussion on the limits, present conditions and mini-environments of the site, as well as its general layout, the road network in the central area, the distribution of the vestiges in the palace-city and the evolution of the settlement.
文摘中国高速铁路网将由时速≮250 km 铁路客运专线网和时速≮200 km 铁路提速线路组成。借鉴国外高速铁路代表作的技术格局,结合中国国情、路情,中国高速铁路的自主技术体系初步形成,站前技术已经取得全面突破,站后技术创新工作已经进入重点突破阶段。透视时速300～350 km 客运专线,中国高速铁路关键技术主要包括运输组织、工务基础设施、牵引供电系统、通信、信号、信息化及动车组等方面内容,要着力解决好无碴轨道、轮轨关系、列车运行控制系统、轨下基础工后沉降控制等重大技术,有效利用资源,创新技术管理手段,采取强有力的技术保障措施,取得中国高速铁路关键技术的全面突破。
