几张鱼目混珠的中国农工银行壹圆券

中国农工银行是由原大宛农工银行改组,于1927年2月正式成立的。该行为商办,开办目的在于以农工银行扶助农工业的发展。开办资本金为1000万元(实收500万元),是为民国时期一家重要的民办商业银行。中国农工银行得到当时北洋政府的特许发行银圆兑换券,该行的第一版银圆票在1927年开始发行,发行的主币面额为壹圆(图1、图2)、伍圆、拾圆三种,辅币面额为壹角、贰角、伍角三种。1935年国民政府实施法币政策,中国农工银行的纸币发行权被取消,该行发行业务由中央银行接收。最近见到了几张“特殊”的中国农工银行壹圆券(图3、图4、图5、图6)。这三张壹…     

高精度磁法在陕西岐山考古中的应用

本文分析了高精度磁法对地下历史遗存进行无损考古探测的基本原理,介绍了高精度磁法在陕西省岐山县周原遗址考古中的应用和取得的重要考古发现,揭示了高精度磁法应用于考古具有很强的可操作性、优越性和广阔的前景。     

重评1946年《中华民国宪法》

1946年《中华民国宪法》是在政治协商会议已经召开、并通过了宪草修改十二条原则的背景下由非国民党人士起草的,因此,与此前国民党一党制定的“五五宪草”比较,存在着一些重大区别。这些重大区别表明：与“五五宪草”不同,1946年《中华民国宪法》多多少少带有一些民主性质或色彩。这些民主性质和色彩是中共、民盟以及全国人民和国民党斗争的结果。     

New techniques for the recovery of small amounts of mature enamel proteins

Currently there are no non-destructive techniques to obtain protein from the dental enamel, the most mineralized tissue in mammals and most resistant to diagenesis, which provides a window to the developing period by means of incremental markings containing proteins. To recover protein, dissolution of powdered enamel is required. Here we tested whether samples obtained by micro-etching of the enamel surface were adequate for protein analysis by MALDI-TOF/TOF mass spectrometry and identification in protein databases. The micro-etch techniques were effective in generating adequate samples for mass spectrometry (from 3 to 13.4 μm superficial enamel), being also highly conservative, since they rendered masses of enamel ranging from 0.1 to 0.4 mg. Using these techniques the separation of proteins by SDS-PAGE was not necessary, and the whole procedure was easier. Results showed successful identification of specific enamel proteins after whole crown superficial etching with 11% EDTA in the case of immature porcine samples, and with 10% HCl in the case of mature human enamel. X- and Y-isoforms of amelogenin, ameloblastin, and enamelin peptides were identified. The new techniques described here allowed the successful recovery of enamel proteins, opening new avenues for the use of enamel protein information in fossil/archeological material, where sometimes little protein is left.     

They say ‘kids with asthma don’t play sports’: geographies of asthma

ABSTRACT

Asthma is common among children worldwide. Although complex, physical activity participation is important in asthma management, to decrease chronic disease risk, and to facilitate healthy lifestyles for children. Team sport participation is a common way for children to engage in physical activity, but the spaces in which team sport is experienced can present social, physical and emotional challenges for children with asthma. This research aims to understand elements of the environment, broadly defined, that impact experiences of asthma in sport. In-depth interviews were conducted with youth team sport athletes (n?=?11) diagnosed with asthma, and youth team sport coaches (n?=?18) in Ontario, Canada. Results suggest that understanding the physical and social needs of child and youth athletes, and ensuring well-controlled asthma, are critical to maximizing performance and improving quality of life for asthmatic athletes.     

Axial Force Estimation in Historical Metal Tie-Rods: Methods,Influencing Parameters,and Laboratory Tests

This research focuses on estimating the axial force of historical metal tie-rods by means of non-destructive testing (NDT) which provides useful information for calibrating structural models. The first part of this work describes the behavior of tie-rods, emphasizing the key role played by cross-section stiffness, which is usually neglected in the case of cables. Particular attention is then given to common effective parameters and dynamic aspects in terms of acquiring the set-up and which modal parameters to examine.

For new insights into methods for assessing historical tie-rods and evaluating the reliability of analytical and numerical predictions, laboratory tests on four samples with typical cross-sections were carried out on historical metal tie-rods. A set of 224 configurations, including various methods of excitation, boundary conditions, and stress states, were analyzed. In addition to laboratory parameters, this analysis also includes details of sensor positions and number of modes to be examined, and proposes a simplification for less time-consuming tests on-site.     

中国城乡流动人口“回流”研究进展与述评

人口流动折射人地关系，在地理学"流动性"转向和全球化背景下，人口流动研究尤其是中国流动人口回流的研究意义愈发凸显。本文以知网核心期刊文献为基础，进行计量分析，从主题、理论演变、研究方法等角度对我国流动人口回流研究进行系统梳理，发现当前研究主要关注的主题包括：乡村发展、政策制度、社会问题、倾向选择、群体差异等，涉及回流人口基本特征、回流动力、回流时机、回流影响等关键问题，对回流空间的研究相对不足；已有研究重视人力资本、国家体制对流动人口回流的影响，较为缺少对于家庭、市场、社会维度的深入分析，研究框架有待进一步完善；重视群体尺度研究，个体尺度的深入实证相对薄弱。未来应积极探索建立跨学科视角的流动人口回流研究框架，重视空间格局、回流机制、回流与城乡发展的互动等方面的研究，加强个体尺度的实证。