水泥历史建筑的加固材料研究初探

我国现存大量的以水泥为基本材料的近现代历史建筑,很多建筑既具有西方建筑美学特征,又融合了中国传统建筑的艺术形态,具有不可替代的历史意义和艺术价值。在长时间的自然和人为因素的影响下,这些建筑都普遍存在内部结构疏松、强度低的状况,保护这些水泥历史建筑已经成为文物保护工作者一项非常迫切的任务。在水分的长期作用下,水泥内部的微孔结构会由于钙质流失而遭到破坏,产生水泥的酥化现象。为加固保护这类历史建筑,本研究合成了一种亲水性高拉伸的有机硅材料。研究表明,该材料能在不明显改变水泥样品表面外观的前提下实现对酥化水泥样品的加固,经有机硅最佳浓度2%加固后的水泥样品的抗压强度可以提升约1倍。同时,这种加固材料在前期施工阶段具有良好的渗透性,加固剂固化后能够有效填补酥化水泥样品中的较大孔隙,从而达到增加强度的效果。另外,这种加固剂具有亲水性的特征,一方面不会存在强憎水性保护剂所带来的保护性破坏,另一方面在大面积现场施工时不需要使用大量有机溶剂,从而避免其对环境和人体的伤害。本研究对于进一步探索和开发水泥历史建筑的加固材料具有重要的借鉴意义。     

降雨对榆阳区明长城单体建筑破坏模式的试验研究

前期调查分析可知,降雨对榆阳区明长城单体建筑的破坏形式包括水力侵蚀和重力侵蚀两大类,主要影响因素为降雨特征、遗址保存形态和遗址土的性质。为了进一步了解降雨对该类土遗址的破坏方式及主要影响因素作用特点,按照相似理论要求设计模型试验,研究了降雨对榆阳区明长城单体建筑的破坏模式。试验结果表明,降雨对遗址模型的破坏方式与前期调查分析结果基本一致,水力侵蚀方式有冲沟侵蚀、片流面蚀、流水淘蚀和流水冲蚀,重力侵蚀方式有坍塌和滑塌。一般A型暴雨条件下,各种水力侵蚀方式均有发生,重力侵蚀发生次数相对较少;B型暴雨条件下,主要发生片流面蚀,重力侵蚀破坏发生次数较多。通过模型试验得出的降雨对遗址模型的破坏方式及发生特点方面的结论,可以在一定程度上为降雨对该类遗址破坏的评估和防治提供参考。     

环十二烷在彩绘织物湿洗中的临时性封护工艺研究

彩绘颜料与织物通过粘合剂相结合的方式决定了彩绘部分的不稳定性,大多彩绘织物都因此经不起湿洗.为此,本实验对环十二烷在彩绘织物湿洗中对彩绘部分的临时性封护加固处理的可行性、效果和安全性进行了研究.通过正交实验法,筛选出了环十二烷的最佳施加工艺条件:双面、刷涂、一遍、环十二烷加热至62℃,并对与环十二烷升华速率相关的环境条件进行了对比研究.实验证明,环十二烷对织物强度以及纤维的微观分子结构等方面没有明显影响,环十二烷在彩绘织物上的应用是安全的.实验启示,本实验的研究思路不仅适用于彩绘织物,对其它类型纺织品文物甚至其它文物如纸张、字画、壁画等的保护修复也有借鉴意义.     

故宫太和殿动力特性与常遇地震响应

为更好地保护故宫太和殿,采用有限元分析方法,研究了太和殿的动力特性及常遇地震作用下的响应。采用弹簧单元模拟榫卯节点及斗拱构造,并考虑柱础为铰接,建立了太和殿有限元模型。通过模态分析,获得了太和殿基频及主振型;通过对模型进行时程分析,获得了典型节点的位移、加速度响应曲线,以及典型单元的内力响应曲线,评价了太和殿的抗震性能。结果表明:太和殿基频为0.9Hz,主振型以平动为主;常遇地震作用下,太和殿能保持稳定振动状态,结构的内力和变形均在容许范围内,且斗拱及榫卯节点均能发挥一定的减震作用。     

"三个代表"重要思想的双重主题及其理论体系

对"建设什么样的党、怎样建设党"和"什么是社会主义、怎样建设社会主义"的回答,是"三个代表"重要思想的双重主题."三个代表"重要思想具有党的建设理论和中国特色社会主义建设理论两大体系.辩证认识"三个代表"重要思想的双重主题及其理论体系,有助于准确把握"三个代表"重要思想的历史地位.     

人形柱陶楼定名与年代问题讨论

人形柱陶楼是极为奇特的汉代建筑明器.本文在以往研究的基础上,从分析造型特征、装饰艺术、使用功能等方面着手,对其定名、年代及墓主身份作了进一步探讨与推测.     

Community unionism and trade union renewal in the UK: moving beyond the fragments at last?

This paper explores the theory and practice of community unionism. It is now widely argued that if trade unions are to reach employees in small workplaces, those on part-time or temporary contracts, and women, black and ethnic minority workers, they need to sustain alliances beyond the walls of the workplace. Increasing the scale of political mobilization in this way can help secure trade union organization amongst new groups of workers while giving unions the power to raise questions of economic and social justice at a wider scale. After summarizing current developments in North America, the paper focuses on the situation in the UK in more detail. By highlighting the pioneering community unionism of the Iron and Steel Trades Confederation (ISTC) and Battersea and Wandsworth Trades Union Council (BWTUC), the paper explores the implications of community unionism for the future of trade unionism in the UK.     

National stereotypes and music

Music became a marker of national identity in nineteenth‐century Europe. Western art music consists of tonal systems that are universally intelligible, but certain rhythms and musical idioms have been associated with national styles. How, when, and why does a musical phrase or piece become national? What political and cultural circumstances contributed to the development of national styles and facilitated the emergence of resonant topographies? What was the relationship between music as cultural practice and nineteenth‐century national thought as discursive space? These questions are addressed with a particular focus on verbunkos, which came to be characteristic of Hungarian national style, and on the Rákóczy March which became famous thanks to Berlioz's Faust. This essay traces the complex process of cultural transfer through which these martial tunes of mixed ethnic origins have become emblematic of Hungarian music.     

Organisational Capacity for Engaging with Indigenous Australians

Community capacity building is a common goal for programmes and policies involving Indigenous peoples, but it relies heavily on organisational capacity to work effectively in intercultural settings. This paper reviews the organisational capacity of the senior leaders of Australian Red Cross and institutional efforts to build a culturally appropriate and respectful organisation. It reports results from a survey of the organisation's leadership team and follow‐up interviews undertaken in 2010, reviews the challenges facing the organisation in working with Aboriginal and Torres Strait Islander Australians, and considers institutional progress in building internal capacity to lead change in working with Aboriginal and Torres Strait Islander Australians. The paper concludes with discussion of wider implications of this research.     

“三党竞斗”:中共在高校中建党的背景分析

在中国革命史上,共产党、青年党和国民党纵横捭阖,在一定程度上决定了中国政党政治发展的格局和走势。而三党竞斗的一个重要交汇点,就在于争取青年学生。在此后20多年三党循环敌对和相互抗衡中,中共广泛运用思想交锋、党团制度、统一战线等斗争策略,从而确保其在国、青两党的攻击下立于不败之地。