Advanced design of Chinese traditional materials for the conservation of historic stone buildings

The conservation of historic stone buildings and sculptures is recently receiving growing attention and becoming a focus of research because of rapid changes in weather conditions (pollution, acid rain, etc.). Presently, techniques for stone conservation primarily involve the use of organic coating treatments, but their side effects have been recognized. In contrast, some traditional materials used in historic stone buildings function well for thousands of years. In this paper, we report our research on the reasons why traditional protective materials can provide an unexpected long-term protection. First, calcium carbonate was prepared according to a formula for making Chinese traditional consolidating materials, and its structure and morphology were examined by different instruments. Second, the reinforcing effectiveness of the prepared CaCO₃ powders was tested and analyzed by investigating its surface characteristics. The experimental results reveal that a biocontrolled process occurs, in which an organic template can induce the precipitation of a mineral structure, which in turn results in a great improvement in the conservation of the historic stone buildings protected by these traditional protective materials. This provides a contribution toward the development of new researches on biocontrolled processes and on some protective materials with excellent performance through biocontrolled synthesis.     

新中国对外关系的发展进程

新中国建立以来,始终坚持独立自主的和平外交政策,努力发展与世界各国的友好合作关系。但随着国际形势的发展变化,我国的对外政策也在不断进行调整,从而在各个不同时期表现出不同的特点。     

论中世纪和近代早期英国中央财政管理机构的沿革

中世纪时,国库、财政署和私室是英国最主要的中央财政管理机构,三个机构的命运漂浮不定,主要原因是国王及其王室才是财政管理的中心所在。都铎时期,国王们为加强对财政的个人控制,建立了私室财政体制。斯图亚特王朝建立初期,中央财政管理一仍旧惯,但1612年的管理革新实践却奠定了后来国库复兴的基础。综观这一时期的财政管理机构的沿革可知,连续性、渐进性、经验性和灵活性是它的主要特点。     

先秦时期珠江三角洲环境变迁与文化演进

本文利用考古材料和多学科的研究成果,分析了先秦时期珠江三角洲的环境变迁与文化演进的关系。文章指出,如果自然资源丰富、种类多样互补和易于攫取,也能发育丰富多彩的、甚至是分层化的擢取经济文化,珠三角网河平原南部的渔猎采集和北部的渔捞采集经济文化,就是两个典型的实例。东周时期冲积平原火耕水耨经济文化的发展繁荣,促成珠江三角洲这个自然地理单元形成文化地理单元,又说明合理的区域文化也不可长久背离人类文化的发展方向。     

海峡殖民地政府对华侨秘密会党政策的演变

选择东南亚华侨秘密会党为研究对象,对海峡殖民地政府对华侨秘密会党的政策演变情况进行了分析。第一时期是放纵与利用;第二时期是利用与控制;第三时期是控制与镇压。殖民政府对待华侨秘密会党的政策演变以维护英国的利益为基础。     

再论“失蜡工艺不是中国青铜时代的选择”

本文从技术史的理论角度论述了“没有需求就没有发明(No need,no invention)”、“没有需求就没有发展”等技术产生发展的客观规律,指出,中国古代(青铜时代)在发达而成体系的青铜范铸技术环境里是不可能孕育发展出“熔模铸造体系”的,并以曾侯乙尊盘的铸造工艺及相关的模拟实验结果作进一步的论证;同时,对中国古代“失蜡工艺”起源于商周青铜器“焚失法”的观点提出质疑,并指出,“失蜡工艺”是在佛教传入中国之后,为铸造“西洋风格”的佛像传入我国。     

Representation and Recursion in the Archaeological Record

Living humans are unique among the animal kingdom with respect to their ability to externalize mental representations outside the brain through a variety of media and in a recursive or creative manner (i.e., generating a potentially infinite array of combinations). Earlier humans evolved two specialized organs—the hand and the vocal tract—as primary instruments for externalizing artificial or semantic representations. These organs and the externalized representations may have co-evolved with the Homo brain. The archaeological record yields examples of simple representations by 1.6 mya. More complex, hierarchical, and recursive forms are evident by roughly 0.25 mya. Complex and highly recursive representations in a wide range of media (including representations of representations in the form of visual art) emerge after 0.1 mya among anatomically modern humans.     

Recent Research in the Southern Highlands and Pacific Coast of Mesoamerica

Recent research on the southern highlands and Pacific Coast of Mesoamerica has investigated topics of interest to all archaeologists. Although best known for studies on the development of early social complexity, research in the region also has addressed hunter/gatherer subsistence patterns, early sedentism, the origins of food production, the development of the state, migration, the construction of social identity, political economy, and the collapse of complex societies. Research has accelerated in the past ten years, fueled by efforts of scholars from a number of disciplines. Recent paleo-ecological studies have provided much needed data for understanding human social action against the backdrop of the natural environment, while the region also has been the scene for testing numerous innovative theories of social change. Studies of identity and its manifestation in material culture have been especially productive.     

Economic geography and the evolution of networks

An evolutionary perspective on economic geography requires adynamic understanding of change in networks. This article explorestheories of network evolution for their use in geography anddevelops the conceptual framework of geographical network trajectories.It specifically assesses how tie selection constitutes the evolutionaryprocess of retention and variation in network structure andhow geography affects these mechanisms. Finally, a typologyof regional network formations is used to discuss opportunitiesfor innovation in and across regions.     

Metaphysics,Metaphor and Multiplicity: A Postmodern Womanist Theology for Today's Thorniest Religious Issues

This article offers the story of Nobel Peace Prize winner Wangari Maathai as a starting point for investigating pressing issues in twenty-first century liberation theologies. Maathai’s story reveals that liberation theologies must still wrestle with the complexity of ongoing oppression and its maldistributed suffering, and a spirituality that is multiply religious. The argument begins by addressing William R. Jones’ challenge to early black theologies with the proposal of a postmodern womanist theology. The author also suggests embracing W.E.B. DuBois’ understanding of double consciousness as a metaphor for discussing religious pluralism that straddles religious categorization. Drawing from the resources of black and womanist theologies, postmodern process metaphysics and black studies, this article offers a framework to understand oppression, human agency, divine justice, and the constructive possibility of narratives and language that allows us to understand and articulate creative ways of speaking about religious pluralism and theorizing liberation theologies outside Christian paradigms.