Chemical and Microscopic Study of Masonry Mortar in Ancient Pagodas in East China

Ancient mortars played a crucial role in the construction of historical architectures due to their physical and chemical compatibility with traditional building materials such as stones and bricks. Therefore, the analysis and optimization of the ancient mortar formula are significant in the restoration and preservation of historical sites. In this work, 20 mortar samples selected from five ancient stone pagodas in Zhejiang Province, China, were analyzed. The results showed that mud, lime-soil mortar, lime-sand mortar, and lime-gypsum mortar were used as binders in these pagodas. The Ca(OH)₂/aggregate ratio ranging from 0.3 to 2.7 was usually used to prepare lime mortar. Protein and polysaccharide were also found in some samples.     

让材料自己说话——浅论当前历史传记写作的一种趋势

《陈寅恪的最后二十年》、《顾颉刚和他的弟子们》、《束星北档案》等著作,代表了当前历史传记写作的一种趋势。《陈寅恪的最后二十年》的文本近似历史叙事散文;《顾颉刚和他的弟子们》的文本更接近史学论文;而《束星北档案》则类同电视记录片的文稿。这些著作共有的特点是:在修撰方式上,大量运用了第一手材料;在文本风格上,力求作品深入浅出、雅俗共赏;在写作理念上,坚持真实第一,尊重历史。这一趋势非常值得重视。     

14C测定判别武王克商年代范围始末

武王克商年代是我国古代编年中的一个关键点,近年来^14C测定技术有了重要发展,我国^14C测年界在此基础上探讨了^14C方法应用于商周历史纪年的希望。1996年夏商周断代工程正式立项,利用^14C测定判别武王克商年代范围的任务得以实施。1998年初两个常规^14C实验室以3‰测定精度,前后开始对陕西丰镐遗址出土样品^14C测定,并于1998年10月6－7日先后公布了^14C数据,提出武王克商代范围应判别在公元前1050－1020年间。1998年下半年AMS室开始测定。三室测定数据对比结果基本相合,利用殷墟,琉璃河等遗址出土的样品系列作^14C测定得出的结果,与上述年代范围一致。1998年11月30日公布了天计算结果,与测定结果不谋而合,经多方面反复验证,历时近二年,都无法动摇已有的判别结果,具有较高的可信度。     

Neighbourhood food environments revisited: When food deserts meet food swamps

This study uses service area–based coverage and various count regression methods to assess neighbourhood-level healthy and unhealthy food environments, and food access associated with different socio-economic groups in Edmonton, Canada. We identify three types of vulnerable neighbourhoods according to different food environments: food deserts (i.e., neighbourhoods lack sufficient access to healthy foods); food swamps (i.e., neighbourhoods have excess access to unhealthy foods); and those with overlaps of food swamps and food deserts. We also identify neighbourhoods with superior access to healthy foods (i.e., food oases). Additionally, our results from regression analyses indicate: (1) child population is negatively associated with both healthy and unhealthy food resources; (2) good access to public transportation is associated with good coverage of all healthy food outlets and convenience stores; and (3) deprived neighbourhoods with higher percentages of minority populations have better coverage of both healthy and unhealthy foods in general. The results from this study can help the City of Edmonton identify the key neighbourhoods with high potential for local business and the hotspot neighbourhoods that require particular support. Tailored strategies are proposed to effectively and efficiently improve food environments with limited resources.     

Discrimination Against Floating Migrants in China:Take Rural-to-Urban Migrants in Beijing As An Example

This essay firstly examines the destiny of rural-to-urban migrants in Beijing, the capital of China. Relying on data collected from representative survey, the essay then provides the demographic profil...     

经济行为与环境变化:清前期台湾野生鹿消失探析

鹿曾经是台湾数量最庞大的野生动物群之一。明末以来,随着台湾贸易交流的活跃,鹿成为大宗出口商品,土著居民由原先捕鹿作为民生用品逐渐发展至为市场服务;清前期大陆移民入台的农业垦殖又破坏了鹿原有的生态环境。人类经济行为引发的环境变化,最终导致了野生鹿在台湾渐趋消失。     

论明万历中后期言官对神宗的批判

明万历中后期,以言官为首的官僚集团兴起了一股批判明神宗的风潮。其根本缘由,首先是神宗君德严重缺失,其次在于言官勇于以道事君。在深层次上,这种批判也是该时期政局危殆、皇权变异并衰落以及士风日下、部分言官沽名钓誉等社会变动综合作用的结果。尽管这种批判并未摆脱传统的“尊君—罪君”的政治评判模式,但它是明清之际启蒙思想的先导和重要的思想资源。     

兔儿爷：从兔神和儿童玩具到民间艺术品

在20世纪50年代初之前兔儿爷在北京是一个流行的节日物件儿,那时候这个泥塑的兔神在中秋节是孩子们必备的玩具,同时也是中秋拜月的偶像,而今兔儿爷是民间艺术品,在旅游纪念品和民间工艺品商店还有春节庙会上都可以买到。兔儿爷里的“儿”是北京话里的儿化音,并没有实际的意思;“爷”在这里是神的意思。     

重论章学诚与戴震的修志之争

清代著名学者戴震和章学诚,曾为修志发生过一场激烈争论。后人根据二人争论中涉及的“史”、“地理”等概念,认为这是方志属于历史学还是地理学的争论。但文章认为,只要认真分析历史与地理学科的形成过程和二人争论的有关问题,就可以发现,二人争论有性情和学术背景不同的原因．也有对修志争论体例的不同认识,但是没有涉及方志学科属性的争论。方志的形成与现代学科的形成是两个不同的历史过程．章、戴之争与方志学科属性无关。     

蓬莱两艘古船船材、淤泥及水主要离子的测试研究

为做好蓬莱小海2005年新出土三艘古船的脱水保护工作,采集了2．3号船的船材、两船之间地下水、船下淤泥和近海海水样品,委托山东省分析测试中心检测了样品中主要离子的含量。检测结果表明,木材和淤泥中的主要离子含量远远高于海水和地下水中的;木材腐朽的程度愈严重,其离子量含量也愈大。测试数据和方法对今后古船脱盐和脱水工作有一定的指导意义。