River meander behaviour and instability: a framework for analysis

Recent empirical and theoretical work on river meanders suggests that instability is inherent. Within this context, an occurrence of multiple cut-offs could be interpreted as a clustering associated with self-organized criticality. Types of meander behaviour ranging from stable to chaotic are examined as trajectories or attractors within the phase space of rate of meander movement and bend curvature and change to the system is explored as shift from one attractor to another. It is suggested that this new approach provides insights into meander dynamics and provides a basis to identify the conditions, limits and constraints under which different behaviour occurs. Basic controls of energy and resistance underlie planform behaviour, but need to be refined in relation to the morphology and stability of channel courses.     

湖北丹江口市玉皇庙遗址调查简报

玉皇庙遗址位于湖北省丹江口市境内,现为丹江口水库中一小岛。1995年,文物工作者对南水北调工程文物调查时发现该遗址。在遗址采集新石器时代和周代遗物。新石器时代遗物与青龙泉和大寺遗址、朱家台遗址和乱石滩遗址等出土的同期遗物相近。周代遗物与官山河两岸早年发现的同期遗物相似。     

顾禄对清代江南民俗的记述与研究——《清嘉录》、《桐桥倚棹录》述评

《清嘉录》、《桐桥倚棹录》记载清代江南丰富多彩的社会生活与风土人情,对民俗的源流和演变作了饶有价值的诠释和考订,因而颇受史学界的关注。继续探索其深厚底蕴,对文化交流和旅游开发具有现实意义。     

The origin of overpressure in 'old' sedimentary basins: an example from the Cooper Basin, Australia

Overpressure in ‘old’ sedimentary basins that have not undergone rapid, recent sedimentation cannot be easily explained using traditional burial‐driven mechanisms. The last significant burial event in the Cooper Basin, Australia, was the Late Cretaceous deposition of the Winton Formation (98.5–90 Ma). Maximum temperature in the basin was attained during the Late Cretaceous, with cooling beginning prior to 75 Ma. Hence, overpressure related to rapid burial or palaeomaximum temperatures (e.g. hydrocarbon generation) must have developed prior to 75 Ma. Retaining overpressure for 75 Ma in ‘old’ basins such as the Cooper Basin requires extremely low seal permeabilities. An alternative explanation is that overpressure in the Cooper Basin has been generated because of an increase in mean stress associated with an increase in horizontal compressive stress since Late Cretaceous times. Structural observations and contemporary stress data indicate that there has been an increase in mean stress of approximately 50 MPa between Late Cretaceous times to that presently measured at 3780 m. The largest measured overpressure in the Cooper Basin is 14.5 MPa at 3780 m in the Kirby 1 well. Hence, disequilibrium compaction driven by increasing mean stress can explain the magnitude of the observed overpressure in the Cooper Basin. Increases in mean stress (tectonic loading) may be a feasible mechanism for overpressure generation in other ‘old’ basins that have undergone a recent increase in horizontal stress (e.g. Anadarko Basin).     

Assessing the reliability of pRIA for identifying ancient proteins from archaeological contexts

The use of immunological techniques for identifying the origin of proteins and inferring foodstuffs exploited by prehistoric occupations has been conducted for several decades. Cases of experimental laboratory and archaeological studies have shown the potential of these techniques for reliable results. However, very few of these case studies employ archaeological sites that have excellent preservation and high-resolution spatial contexts between identifiable faunal remains, features, and stone tools. We present an assessment of the identification reliability of one immunological technique, protein radioimmunoassay (pRIA), using faunal remains and stone tools from two sites from arctic and subarctic contexts. The results of this research indicate that, even in contexts with excellent preservation, the identifications produced by the pRIA technique are subject to misidentification and cross-reactions due to diagenetic alteration of proteins. We propose a higher minimum reaction value (percent binding of labeled antibody) that mitigates these effects, and renders the pRIA results more reliable for ancient, poorly preserved organic remains.     

20世纪50年代安徽水灾中医疗救助活动述论——以1954年淮河水灾为例

20世纪50年代安徽淮河地区遭遇严重水灾,各级各地政府紧急组织救灾活动,并对灾后的农村进行医疗救助。本文以安徽省卫生厅档案资料为依据,梳理、阐述1954年安徽淮河水灾后各级各地政府的医疗救灾措施,揭示医疗救灾活动在社会救灾中的作用,探究其取得成效的原因及存在的不足之处。     

长江经济带交通基础设施空间均衡度研究

利用1997-2013年长江经济带各省份数据,研究了交通基础设施空间均衡和极化程度及其影响因素,并构建动态面板数据模型,采用系统GMM估计进行了实证检验。研究结果表明:长江经济带交通基础设施发展较快,但存在空间非均衡和空间极化特征;铁路密度和公路密度的空间非均衡程度依次递减,区域间差距是空间非均衡的主要原因;公路密度空间极化程度不断增加,且高于铁路密度的极化程度;财政支出、国际贸易、人力资源和新经济地理四大因素对交通基础设施空间均衡和极化具有影响,但影响效果不同。本文拓展了交通基础设施的研究,为长江经济带交通基础设施协调发展及互联互通战略顺利实施提供了政策依据。     

黄河流域区域经济差异的时空动态分析

以黄河流域的各地级市为研究单元,人均GDP为测度指标,综合运用不同时空动态分析方法,在Open Geoda和Pysal2.7软件支持下,对1990-2013年黄河流域73个地级市经济发展水平空间格局和演变过程进行分析。研究表明:黄河流域整体区域经济差异呈现先扩大后减小的趋势,东部地区内部差异最显著对整体差异贡献最大,中部、西部区域经济差异相对稳定;流域经济空间异质性明显,存在显著的空间正相关,区域经济格局两极化明显且东部经济水平明显高于中西部地区,流域经济发展的热点区主要分布在山东省内,冷点区主要分布在甘肃、陕西、青海等部分州市;通过分析黄河流域73个地级市经济发展类型时空演变特征,反映出黄河流域经济发展存在俱乐部趋同趋势,初始状态对区域经济发展具有重要作用,区域背景亦具有一定作用,区域经济水平的跨越式发展基本不存在。     

长江流域“原史时代”概论

自新石器时代末史前文明断裂至秦帝国建立被正式纳入以中原地区为主体的历史体系之前的这一时期,是长江流域历史或文明进程中一个独特的阶段,其特征与西方史学和考古界通行的"原史时代"概念吻合,因而建议将这一时期独立出来作为长江流域史前时代和历史时代之间的过渡阶段——"原史时代",并就长江流域"原史时代"的特征、分期及其对于长江流域自身历史和人类文明进程研究的学术意义进行了阐述。     

贵州北盘江流域先秦时期遗存分期与相关问题

本文通过对贵州北盘江流域先秦时期遗存的分析,依据文化面貌的差异将其分为三期,并结合周邻地区同时期材料的比对判定其年代。在此基础上,对它们所体现的葬俗、生计方式、居住形态和文化性质等方面进行探讨。