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.     

Crowdsourcing Model Research for the Identification of Post-Earthquake Rescue Objects

The quick and accurate identification of post-earthquake rescue objects can minimize the casualties and property loss caused by earthquakes. With the rapid development of remote sensing technology, rescue objects can be identified through high-resolution remote sensing images. There are two main categories of approaches to identify rescue object through high-resolution images: automatic extraction by a computer and visual judgment by professionals. Although results can be obtained quickly by using automatic extraction, the accuracy of the results is unacceptably low. For visual judgment, the large demands for time and professionals restrict its wide practical application. In this study, we introduce crowdsourcing into the identification of post-earthquake rescue objects. First, we integrate the advantages of the computer and crowdsourcing, which means that the computer takes advantage of the speed of information processing, while crowdsourcing makes full use of human recognition capabilities. Second, we take visual judgment tasks out of the hands of professionals and entrust the tasks to workers in a crowdsourcing platform. Not only are the human resources infinite, but we can also improve the efficiency of identifying rescue objects. Third, we propose a crowdsourcing model that improves the quality of the results and saves human resources. Finally, experimental results demonstrate that our solution is feasible.     

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。     

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.     

从生态角度看原始社会的价值

在弓箭产生之前的原始社会,人类制造的石器工具不具备大规模改变生态环境的效能;人类最基本的食物获取方式采集与狩猎也不构成对生态环境的大规模破坏;人类和其他生物一起,维护着生态系统的和谐、稳定与美丽。尽管在文明程度方面原始社会无法同后来的文明时代相比,但是,同农业时代和工业时代人类对生态环境的大规模破坏,人类同大自然的日益疏离相比,原始社会在人类历史上具有无与伦比的生态保护价值,给文明时代人类极其重要的启迪,应该作为人类历史的宝贵财富加以珍视。     

Seeking evidence: The 1984 visit to Nanjing by a Japanese investigative team and its significance

ABSTRACT

In December 1984, a private Japanese academic organization, the “Nanjing Incident Research Committee” (Nankin Jiken Chōsa Kenkyūkai), sent a survey team to visit Nanjing, with the aim of obtaining more evidence on the Nanjing Massacre to counter the internal debate within Japan. Through the coordination by the “Office of the Leading Team on History, Museums and Monuments for the Nanjing Massacre” during the visit, the survey team was able not only to gather historical materials, meet with survivors, and tour historical sites, but also to engage in exchanges with Nanjing researchers and students of Nanjing University. This visit to Nanjing further publicized Japan’s internal debate on the Nanjing Massacre in China, while also representing an unprecedented effort for collaboration between China and Japan in research on the Nanjing Massacre.     

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。     

三代时期出土柄形玉器研究

目次一柄形玉器的发现二柄形玉器的类型及其特征三关于柄形玉器的几个问题四结论夏商西周时期是中国玉器发展的成长阶段,随着各地之间的文化交流不断加强,玉器风格也趋于一致并不断创新。制玉工艺技术的进步大大提高了玉器制品的数量与质量,对后世影响深远的玉器礼制也完备于这一时期。柄形玉器是三代玉制品中出土数量最多的器形之一,大多呈扁平长条形,下端多有短而薄的榫,有的榫上有孔,由于用途不清楚,过去有人称之为琴拨、玉拨子。后来以其形似器柄     

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。