Study on the strontium isotope standard in pig teeth excavated from Zaoshugounao site,Shaanxi Province of China

In archaeology, strontium isotope analysis is developing into an efficient scientific technique for tracing the movement of prehistoric humans and animals. Determining the local bioavailable ⁸⁷Sr/⁸⁶Sr ratio range is the key to distinguishing whether the human or animal is indigenous to the local area. It has been shown that the ⁸⁷Sr/⁸⁶Sr ratio in the enamel of pigs can be an excellent sample to determine the range of local strontium isotope ratio at the site. However, pigs may not be all local at the site, and there is no special study on whether pigs’ different ages and tooth types impact the local strontium isotope characteristics. In this paper, the tooth enamel of 19 pigs from the Zaoshugounao site for strontium isotope ratio (⁸⁷Sr/⁸⁶Sr) by multicollector–inductively coupled plasma mass spectrometry. There were no significant differences in ⁸⁷Sr/⁸⁶Sr ratios of local pigs at different months and different molar types, which did not affect the determination of the local strontium isotope standard. Based on the local strontium isotope ratio range (0.711056–0.711476), we found that five pigs were non-local. The Jing and Wei river basins (in Guanzhong basin) and northern Shaanxi are likely sources of non-pigs.     

A High-Performance Quadrilateral Flat Shell Element for Seismic Collapse Simulation of Tall Buildings and Its Implementation in OpenSees

Shear walls are important lateral force-resistant components of tall buildings. Hence, a reliable numerical model that can accurately represent the mechanical characteristics and large deformations of shear walls is critical for realistic collapse simulation of tall buildings. Based on the theory of generalized conforming element, a high-performance quadrilateral flat shell element, NLDKGQ, accounting for the large deformation using the updated Lagrangian formulation, is proposed herein and implemented in OpenSees. The reliability of NLDKGQ is validated using classical benchmark problems and reinforced concrete specimens. In addition, its capability in simulating the collapse of a tall building is also demonstrated.     

The impacts of parental migration on children’s subjective well-being in rural china: a double-edged sword

ABSTRACT

The emerging problem of left-behind children has attracted mounting academic and policy attention. Prior studies primarily cast light on left-behind children’s education, health, and behavior, while their subjective well-being is much less understood yet. Based on a nationally representative sample of rural children aged 10–15 in 2014, we examine the impacts of different types of parental migration on children’s subjective well-being and how these affects vary between boys and girls. The results show that parental migration is a double-edged sword: children from both-parent migrant families report compromised life satisfaction and relationship quality compared with those in integral families, and mother-only migration significantly lowers children’s subjective health. On the flip side, father-only migration enhances children’s aspiration for attaining college, an encouraging effect that is even stronger than that of parental education and family income. These effects are heterogeneous by children’s gender: boys seem to be more susceptible to the disruptive effects of both-parent migration; mother-only migration effectively promotes girls’ educational aspiration while father-only migration promotes boys’. This study portrays a comprehensive image of left-behind children. Relaxation of hukou restriction, equal access to education, and revitalization of rural economies are imperative to improve the well-being of left-behind children.

Abbreviations: LBC: Left-behing children; SWB: subjective well-being     

清代帝陵的哑巴院和月牙城

本文论述清代帝陵中的哑巴院和月牙城的建置与功用,进而探讨其规制的起源问题。指出关外的福陵与昭陵系参照北京明代后期的帝陵及清孝陵兴建,而南京明孝陵的规制已见哑巴院的雏形,其发展演变脉络清晰,故而哑巴院和月牙城并非明清两代帝陵规制最显著的差别。     

萧何收集整理图书文献之功探微

文献是伴随着文化的创造而产生的。汉代的图书收集与整理主要是由汉武帝倡导,刘向、刘歆父子集大成,但不能忽视开国元勋萧何的奠基之功。文章从保护与利用、收集与创建等方面揭示了萧何对文献学及整个中华文化史作出的贡献。     

河南北宋壁画墓的题材及艺术特色

北宋墓室壁画是宋代绘画的重要组成部分,题材有日常生活、孝行故事、超度升仙和装饰性画面等四类,布局、构图都遵循一定的程式,但构思巧妙、技法多变,体现了北宋绘画艺术的丰富多彩与繁荣昌盛。     

明治旧民法典的编纂及其特点

明治旧民法典是日本近代法制建设的重要一页,虽然其未被实施,但是,从明治旧民法典编纂过程来看,它是近代日本实现民族独立和社会发展的需要,对近代日本法律体制的形成有深远的影响。     

《司马法》成书及版本考述

《司马法》旧题"司马穰苴撰",根据《史记》和《左传》的相关材料可以基本认定,司马穰苴是陈完的后裔,其军事生涯大约在周景王十三年(公元前532年)至周敬王三十年(公元前490年)之间的某一段时期,今本《司马法》5篇应该是齐威王时齐国大夫追述的古司马兵法和穰苴军事思想的混合体,它来自宋代刊定的《武经七书》,有三卷本和一卷本两个版本系统。     

青海省阶梯式旅游模式的探讨

一、问题的提出青藏高原是地球上隆起最高、最年轻的高原,平均海拔4000米以上,有“世界屋脊”和“地球之巅”之称。长期以来,青藏高原以其年轻的地质发展史、活跃的新构造运动、剧烈的环境演变、独特的生物多样性、丰富多彩的自然景观,以及由此孕育的独特的各民族     

Sino–American relations: new changes and new challenges

Sino–American relations encompass a highly complex array of cooperative and competitive dimensions. Recently, they have evolved around the question of ‘China's rise’ or (as Chinese analysts would state it) ‘peaceful evolution’. This article surveys both the cooperative and competitive structural elements of this important bilateral relationship. It tracks recent transitions in that relationship, arguing that China's new-found status as a ‘responsible stakeholder’ in American eyes will present a new set of American expectations and new forms of strategic collaboration that will seriously test both sides’ policy creativity and ability to adapt to a rapidly changing global environment.