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This article studies the lifetime interprovincial migration of the Canada-born elderly (aged 60 and over), based on the data of the 1996 population census. The outcomes of the lifetime migration are found to be highly consistent with the human capital investment theory: there were substantial net transfers of migrants from the 'have not' provinces to the 'have' provinces, and the migrants moving in the 'right' direction, on average, achieved long-term income improvements. However, the long-term income improvements attributable to lifetime migration, both directly and indirectly via educational improvement, were in general not large enough to compensate for the disadvantages of being born in the 'have not' provinces and to francophone parents. The lifetime migration is also found to be highly selective by mother tongue and to have aggravated somewhat the spatial polarisation between Francophones and non-Francophones. 相似文献
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本文对“拉美结构主义”的定义及其相关概念、拉美结构主义与凯恩斯主义之间的关系、拉美结构主义的主要内容及其评价等问题作了比较系统的梳理和深入探讨,对这几个拉美结构主义研究中的关键性问题阐述了自己的见解。 相似文献
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判断学术作有无学术价值的标准是:该书是否在一定程度上反映了当时时代的思想和当时社会的要求,是否产生过较大的影响.并且对今人的研究有一定的意义。翻译作中学术译名的统一只能是相对的。史学评论必须提倡优良的作风,高尚的德,实事求是的评述才会使评论成为促进史学发展的有力武器。 相似文献
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景观生态学在旅游规划中的应用 总被引:21,自引:0,他引:21
本文用景观生态学原理,分析在景观生态学指导下旅游规划的过程,对旅游规划的景观生态学途径--规划结合自然进行探讨,认为"规划结合自然"是历史的趋势、时代的选择。 相似文献
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化学材料在石质文物保护中的应用 总被引:1,自引:0,他引:1
齐迎萍 《文物保护与考古科学》2008,20(4):64-68
综述了目前石质文物保护中所用化学材料的种类、特点及应用,探讨了一些在石质文物保护中有发展潜能的化学材料。有机硅材料、纳米材料和仿生材料具有较好的应用前景。深入研究保护材料与石材的相互作用的微观机理,对于开发适用的石质文物保护材料是非常重要的。 相似文献
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Nobuo Shigehara Qi Guoqin Hajime Komiya Yuan Jing 《International Journal of Osteoarchaeology》1998,8(1):11-22
Ancient Chinese dogs excavated at three archaeological sites and stored in the Institute of Vertebrate Paleontology and Paleoanthropology, Academia Sinica, were the object of this study (Xiawanggang site, 5000–6000 years BP; Keshengzhuang site, 3000–4000 years BP; Shangsunjia site, Bronze age). During these periods, there were large morphological variations in Chinese dogs beyond a single dog class, as with Jomon dogs. Dogs with a large ‘stop’ were already present in China but not in Japan. At the Keshengzhuang site, middle to large class dogs were also excavated. At least three types were confirmed within these dogs. In the aged dog in Xiawanggang, antemortem loss of many teeth was observed suggesting active use of the teeth and it is possible that this dog was used for hunting as were the Japanese Jomon dogs. © 1998 John Wiley & Sons, Ltd. 相似文献
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也谈巴蜀货币及其相关问题 总被引:1,自引:0,他引:1
巴、蜀国未铸币。见于列国遗址的桥形铜片非货币而为铜璜,是上个世纪五六十年代学术界的共识。但随着近十几年巴蜀青铜化大发现,这一问题又被提了出来。本先是重新审视了各地桥形铜片的出土环境(部位、伴存物件)、形制特点和存在时限,判定它与配饰品关系多多,并找到它在商周组玉佩的发展与衰减中的位置,遂确认它源于玉佩中的璜。为规范物定名,建议统一命名为铜璜而不再它称。最后,从巴蜀国的时代背景、经济化状况及其同周边国家关系、货币铸行规律等多方面考察,认为巴蜀国可能仍处在实物货币阶段,使用盐、帛(赛布)类为交换媒介。 相似文献
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景德镇御窑遗址出土的15世纪中叶青花方胜纹绣墩,体量较大,器形特殊,出土时破损和缺失严重,修复难度较大。本研究通过分析传统考古修复中石膏作为补配材料的局限性,利用3D扫描打印的优势,设计采用新颖的高强度透明树脂取代传统修复补缺材料,并且结合特制的加固装置完成对大型青花绣墩的考古修复,满足了后期研究与展览的需要。本研究提出了具有一定实践意义的3D打印补配大件异形陶瓷器的修复技术路线。 相似文献