1797-1800年美国与法国准战争探析

18世纪晚期,美国为维护海上权益与地缘安全,加剧了与英法之间的矛盾。美国在《杰伊条约》中对英国的让步,换取到美英之间十年的和睦,却导致美法关系紧张,美国与法国从同盟走向准战争状态。最终美法危机得以和平解决,但这场准战争深深影响了美国早期的内政和外交。     

Where Do the Lead Ingots of the Saintes‐maries‐de‐la‐mer Wreck Come From? Archaeology Compared With Physics

The lead isotope compositions of many different samples from lead ingots of Roman age from two relicts (from Cabrera, and from Saintes‐Maries‐de‐la‐Mer) of the Western Mediterranean have been measured. Other lead isotope analyses of ores, metals or lead ingots from mines of Sierra Morena and from Cartagena and Sardinia have been accomplished. All the lead isotope measurements have been performed at the Joint Research Centre of the European Union, Ispra (Va), Italy. The samples have been prepared in a class 100 clean room, using only ultrapure reagents and FEP materials. In view of the archaeological arguments, it was possible to believe that the Roman lead ingots of the Saintes‐Maries‐de‐la‐Mer 1 wreck came from Spanish lodes, as well as those of the Cabrera 5 wreck. In fact, while the comparison between the first group of ingots (Cabrera 5) and the lead from Sierra Morena is consistent, the correspondence between the second group of ingots (Saintes‐Maries‐de‐la‐Mer 1) and the Cevennes ores (southern France) gives rise to several problems concerning the archaeological and physical origins. These problems are discussed.     

都市社区旅游国际化的\"新天地\"模式

都市社区旅游的国际化是大都市国际化的先导和符号。大都市社区旅游不仅是都市旅游空间组织和发展的重要模式,也是旅游产品国际化的重要表现形式。从社区国际化的视角思考都市旅游目的地建设,实现旅游国际化与社区发展的良性互动,是都市旅游发展的新途径。社区旅游国际化的关键在于社区旅游环境氛围的文化底蕴地方化、旅游服务质量的国际化、接待游客来源的国际多元化、旅游产品供给与体验的国际时尚化。基于上海石库门社区文化特色的“新天地”模式,具有都市社区旅游国际化的示范和启迪效应。     

中国八大都市区管治阶段的判定

中国正处于都市区化带动城市化发展的新城市时代,这种新的城市化发展状况要求我们关注大都市区的管治,而大都市区发展状况也与治理有着相当程度的关联。在借助城市流模型对目前中国大陆地区存在的八大都市区集聚扩散分析的基础上,通过关注各个大都市区非政府部门的发育状况,尝试性地分析了这些大都市区管治所处的阶段,并对国外大都市区研究进行总结,认为优化城市体系结构、加强非政府组织的建设、完善公民参与机制是提高我国大都市区管治效益的关键。