平遥弓村遗址出土猪骨骨架的现场保护及整体提取

为实施安全、有效的技术保护,采用低浓度Paraloid B-72丙烯酸树脂对出土于平遥弓村遗址,侵蚀严重、强度较低的猪骨骨架进行了现场保护加固处理。在此基础上实施了整体切割,套箱提取,完整的将其提取回实验室。结果表明,使用的方法合理,材料有效。保护工作对今后类似文物的现场保护和整体提取有一定的借鉴作用。     

First records of Wuchiapingian (Late Permian) conodonts in the Xainza area,Lhasa Block,Tibet, and their palaeobiogeographic implications

Yuan, D.X., Zhang, Y.C., Zhang, Y.J., Zhu, T.X. & Shen, S.Z., 2014. First records of Wuchiapingian (Late Permian) conodonts in the Xainza area, Lhasa Block, Tibet, and their palaeobiogeographic implications. Alcheringa 38, 546–556. ISSN 0311-5518.

Conodonts are among the best fossil groups to provide high-resolution biostratigraphic correlation and resolve the palaeobiogeographic evolution of the Permian. However, they have been rarely reported from the Lhasa Block in Tibet. Here we report the first discovery of Wuchiapingian (early Lopingian) conodonts from the Xiala Formation in the Lhasa Block, Tibet. This conodont fauna includes two genera and three species (Clarkina liangshanensis, C. orientalis, Iranognathus sp.). The conodont fauna indicates that the Xiala Formation previously assigned to the Guadalupian actually ranges from late Kungurian to late Wuchiapingian. The existence of the late Wuchiapingian conodont species Clarkina orientalis and C. liangshanensis in the Lhasa Block provides additional data to support the viewpoint that this block probably had been in a warm-water regime during the Wuchiapingian (Lopingian).

Dong-Xun Yuan [yuanzi55@163.com], School of Earth Sciences and Engineering, Nanjing University, 22 Hankou Road, Nanjing, 210093, PR China and State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, PR China; Yi-Chun Zhang [yczhang@nigpas.ac.cn] and Shu-Zhong Shen [szshen@nigpas.ac.cn] (corresponding author), State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, PR China; Yu-Jie Zhang [zebiac@163.com] and Tong-Xing Zhu [ztongxing88@yahoo.com.cn], Chengdu Center, China Geological Survey, 2 Renming Road North, Chengdu, 610081, PR China. Received 9.1.2014; revised 1.4.2014; accepted 28.4.2014.     

Contact Dynamics of Masonry Block Structures Using Mathematical Programming

A simple variational formulation for contact dynamics is adopted to investigate the dynamic behavior of planar masonry block structures subjected to seismic events. The numerical model is a two-dimensional assemblage of rigid blocks interacting at potential contact points located at the vertices of the interfaces. A no-tension and associative frictional behavior with infinite compressive strength is considered for joints. The dynamic contact problem is formulated as a quadratic programming problem (QP) and an iterative procedure is implemented for time integration. Applications to analytical and numerical case studies are presented for validation. Comparisons with the experimental results of a masonry wall under free rocking motion and of a small scale panel with opening subjected to in-plane loads are also carried out to evaluate the accuracy and the computational efficiency of the formulation adopted.     

Artinskian (Early Permian) fusuline fauna from the Rongma area in northern Tibet: palaeoclimatic and palaeobiogeographic implications

Zhang, Y.C., Wang, Y., Zhang, Y.J. & Yuan, D.X., 2013. Artinskian (Early Permian) fusuline fauna from the Rongma area in northern Tibet: palaeoclimatic and palaeobiogeographic implications. Alcheringa 37, 529–546. ISSN 0311–5518.

A fusuline fauna consisting of ten species in five genera from the Qudi Formation of the Jiaomuri and Gangtangcuo sections in the Rongma area, northern Tibet, is described. This fauna contains a few typical Peri-Gondwanan fusuline species such as Pseudofusulina pamirensis, Neodutkevitchia insignis and N. sp. cf. N. tumidiscula. The fauna is dated as Artinskian based on the presence of both genera Chalaroschwagerina and Praeskinnerella. The Peri-Gondwanan fusuline fauna in the Qiangtang Block is grouped palaeobiogeographically into the Southern Transitional Zone, which is located in the southern part of the Peri-Gondwanan blocks during the late Sakmarian and Artinskian. Moreover, the occurrence of the Peri-Gondwanan fusuline fauna, the lithological transition from glacimarine deposits to carbonates, and the Peri-Gondwanan fusulines’ apparent southeastward migration from the Kalmard Block of central Iran during the Artinskian, are interpreted here to be the result of global warming after the peak of the Late Palaeozoic Ice Age.

Yi-chun Zhang [geozyc@yahoo.com], School of Life and Environmental Sciences, Deakin University, Melbourne Burwood Campus, 221 Burwood Highway, Burwood, Victoria 3125, Australia; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, 39 East Beijing Road, Nanjing 210008, PR China; Yue Wang [yuewang@nigpas.ac.cn], State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, 39 East Beijing Road, Nanjing 210008, PR China; Yu-jie Zhang [zebiac@163.com], Chengdu Center, China Geological Survey, 2 Renming Road North, Chengdu 610081, PR China; Dong-xun Yuan [yuanzi55@163.com], State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, 39 East Beijing Road, Nanjing 210008, China; Department of Earth Sciences, Nanjing University, 22 Hankou Road, Nanjing 210008, PR China. Received 12.3.2013; revised 2.5.2013; accepted 12.5.2013.     

拉萨八廓历史文化街区旅游发展居民感知研究

历史街区是特定地域历史、社会、文化的核心载体,兼具遗产保护、旅游开发价值,在历史街区旅游发展过程中,如何平衡保护与开发是历史地段发展一直面临的挑战。拉萨市八廓街为"中国历史文化名街",代表着藏族历史文化街区的价值与特色,同时也是西藏集宗教、文化、旅游、商业为一体的重要旅游吸引物。本文以八廓街历史文化街区为例,通过实地观察及问卷调查等方式,探讨旅游开发影响与居民感知之间的关系。研究表明,旅游对于地方经济的积极效益已得到普遍肯定,但是旅游对历史街区的具体作用,尤其是对社会文化负面影响的表现是存在分异的,由此也形成了居民态度的差异。     

考古发掘现场文物保护中的整体提取技术

整体提取是考古发掘现场文物保护中的重要提取技术。讨论了整体提取的概念及使用条件,并从整体提取的不同方式、方法及使用的不同材料出发,介绍了基本提取法、套箱提取法、石膏提取法和聚氨酯泡沫提取法四种考古发掘现场文物保护中常用的整体提取方法。总结了四种整体提取方法各自的特点,得出了土壤强度较好且文物体量较小时采用基本提取法,土壤强度较好但文物体量较大时采用套箱提取法,土壤强度较差但文物体量较小时采用石膏提取法,土壤强度较差且文物体量较大时采用聚氨酯泡沫提取法的结论。     

拉萨八廓街旅游劳工移民地方融入研究

地方融入是地方理论的延展和应用领域,其本土化实践与理论研究还有待推进.本文以拉萨八廓街的旅游劳工移民为研究对象,采用关键词网络分析和扎根理论,结合四层一体分析框架,探索该群体的地方融入现状和过程.研究表明:①拉萨八廓街旅游劳工移民地方融入过程可划分为自评、动机、实践和依恋4个阶段;②拉萨的社会氛围体现在对外的高度包容性...     

Weathering Effects on the Engineering Properties of Sydney (Yellow Block) Sandstone when used as a Building Material

Sydney (Yellow Block) Sandstone is the primary building material used in many nineteenth century buildings in Sydney, Australia. As a natural material, it is subject to deterioration in the salty environment and in extreme cases will need to be removed and replaced. Two cornice pieces have been removed from State Heritage Registered, the Australian Museum due to evidence of visual decay patterns including surface degradation, slight sanding, granular disintegration, contour scaling and flaking, pitting, discoloration, soiling, alga growth and there are missing parts. Stone samples removed from within these building elements were tested for their engineering properties after over 100 years of natural exposure. It was found that the stone has become weaker, softer, less durable, and has an increased capacity to absorb water. The stone was found to be more susceptible to attack from sodium sulfate ingress as opposed to sodium chloride, which would have contributed to the weathering effects noted on the stone. The degree of exposure experienced by each building element was also found to be a factor in the loss of stone quality.     

清至民国西宁至拉萨道路(青海段)分布格局的变迁——基于古旧地图及数字化的分析

西宁至拉萨道路是青海地区交通网中的主线,近代西宁至拉萨道路(青海段)分布格局的变迁代表了青海地区历史时期道路分布格局变迁的一般规律。基于中国国家图书馆所藏1935年《青海省三十万分一图》的数字化成果,结合其他时期的资料可复原出清初至1954年近三百年青海地区西宁至拉萨道路分布格局的变迁过程。驿站制度裁撤导致的清代官道系统崩溃,新式交通工具带来的新交通体系和民国时期青海地区的开发活动是近代青海地区道路分布格局变迁的三大驱动力。清至民国西宁至拉萨道路(青海段)分布格局的变迁,表现出历史时期复杂地形条件下道路分布格局易受多变的人文要素影响的特点。基于丰富实测地图资料的近代道路复原是准确复原古代道路的基础。