二里头遗址铸铜技术研究

目次一二里头遗址出土青铜器的技术特征及铸造工艺二二里头遗址出土陶范考察三二里头遗址出土浇勺考察四二里头遗址铸铜技术初论二里头遗址是先秦时期的重要文化遗存。在二里头遗址中发现了迄今为止中国最早的铸铜作坊遗址(图一)。铸铜遗物在第三、四、五区都有发现,铸铜作坊遗址主要位于四区,总面积在10000平方米以上,已清理出二至四期的铸造工场遗址,其周围遗留不少陶范、坩埚、炉壁、铜渣、木炭,及一些小件铜器、少量大件铜器〔1〕。青铜器是二里头遗址出土的主要遗物之一,有礼器、工具、兵器     

论中世纪英格兰庄园的运输役

中世纪英格兰运输役起源于庄园领主的物资供应需求,随着12、13世纪市场的激增以及运输条件的改善,市场型运输役逐渐普及。运输役一般由农民上层承担,其运输距离、目的地、运输种类等都受习俗制约。运输役衰落的原因主要有直营领地的衰落、运输的专职化以及私下交易的流行。运输役的兴衰与中世纪英格兰市场培育密切相关,是市场已有一定发育但还不太成熟的产物。     

指引小农经济通向现代化的灯塔——中国共产党农民合作经济的四大理论成果

中国共产党成立90年来,在农民合作经济方面形成了四大理论成果。毛泽东关于组织起来是必由之路的论断,指明了方向,解决了如何根据汪洋大海的小农经济的状况选择什么样的路径引导农民通向现代化的问题;邓小平关于农业两个飞跃的论断,明确了阶段,解决了如何适应生产力发展要求选择什么样的战略阶段推进组织化的问题;多种类型农民合作经济组织共同发展及规模经营形式多样化认识的形成,明晰了形式,解决了如何适应国情及农情选择什么样的模式推进组织化的问题;以民办、民有、民管、民受益为内核的原则及其相应制度的形成,探明了制度,解决了如何尊重农民意愿选择什么样的制度推进组织化的问题。     

Study on a Simplified Calculation Method for Hydrodynamic Pressure to Slender Structures Under Earthquakes

Based on Morison hydrodynamic force theory, a simplified calculation method for hydrodynamic force to slender structures is proposed. A typical cylindrical deep water pile was chosen for study and the simplified method was used to analyze the influence of hydrodynamic pressure on the pile. Then the finite element method was used to study the dynamic characteristics of the model, and the results from both methods were compared. A comparison was also made between the shaking table test on the south tower of the Nanjing Yangtze 3rd River Bridge and the results from the simplified method.     

长春市人口老龄化时空演变及空间类型研究

构造了一个由数量老龄化、结构老龄化和密度老龄化三个指标所组成的综合老龄化指数（CAI）,并建立了一套人口老龄化空间类型划分方案,运用多尺度空间自相关分析对长春市人口老龄化空间的时空演变及空间类型进行研究。结果表明：①长春市近10年出现了老年人口郊区化的趋势,人口老龄化空间的“中心-边缘”分布格局在10年内没有发生显著改变,但空间扩散趋势十分明显,东部和南部近郊区出现了明显的人口老化趋势。②长春市形成了残留老化、集聚老化、自然老化和集聚稀释四种不同的人口老龄化类型区。城市核心区和远郊区形成以非老年人口大量流失为基本特征的残留老化型地区,而近郊区则形成以年轻人口大量涌入为特征的集聚稀释型地区,人口老龄化空间整体上呈现出一种城市中心区和远郊区的老化程度高于近郊区的夹层结构。     

Spatial–temporal distribution and geographic context of Neolithic cultural sites in the Hanjiang River Basin,Southern Shaanxi,China

Understanding how to live successfully within our environment is among the most pressing challenges facing contemporary society. This paper probes the problem based on comparative analysis and discusses the relationship between the spatial–temporal distribution of the Neolithic cultural sites and the geographic context in the Hanjiang River Basin in the south of Shaanxi Province, China. Archaeological studies have identified 175 Neolithic cultural sites in the study area, with a sequence of Laoguantai (¹⁴C age 8–7 ka BP), Yangshao (¹⁴C age 7–5 ka BP) and the late period of the Neolithic Age (¹⁴C age 5–4 ka BP). The total number of archaeological sites, the distribution area and the density all showed an early ascending and later descending trend, but the proportion of the number of archaeological sites in the study area to the corresponding value of the entire Shaanxi Province declined sharply. Spatially, these sites were concentrated on the terraces of the Hanjiang River and its main tributaries with an altitude of 400–800 m. Multiple data were integrated to clarify the critical effects of tectonic and geomorphologic conditions on the distribution of the Neolithic sites. Further comparisons revealed the correlation of Holocene climate change and environmental evolution with the Neolithic cultural succession in the study area that ameliorated conditions to generally promote the development of the primitive culture while degeneration coincided with the culture's transition or interruption. The discussion on the origin of the primitive culture and the temporal–spatial distribution corresponding to the regional culture differentiation sheds light on the complex and dynamic human–nature interaction system during the Neolithic Age, thus emphasising the wider field-based investigation and high-resolution reconstruction works of the palaeoclimate and palaeoenvironment in the future.     

STRUCTURAL CONTROL ALGORITHMS IN EARTHQUAKE RESISTANT DESIGN

The dynamic finite element equations of a two-dimensional structure made of axial-flexural frame elements with tendon-driven actuators have been derived. A critical review of classical optimal control theory is made with respect to its application to the control of structure under seismic excitations. Seven control algorithms, including two newly proposed algorithms, have been described, investigated and discussed. The need of an optimal observer, Kalman filter, is discussed. The validity of separation theorem applicable to the optimal stochastic control of structure for earthquake resistance is shown. How the control system perform under the circumstances of actuator saturation is also shown. Several numerical examples are worked out to demonstrate and compare the efficiency and limitations of those control algorithms.     

基于GIS的盐城城市内部空间结构演变分析

根据1984、1997、2003、2006年4个时相数据,运用GIS的空间分析方法,对盐城城市工业、居住、公共服务用地的空间分异特征进行分析,并利用多种景观格局指数,分析了三种功能用地的完整性、集聚性和异质性特征。结果表明:1984-2006年盐城城市内部空间结构演变过程可划分为集聚、分散、再集聚三个阶段,同时演变中存在"工业围城"、城市中心区的工业和居住用地比重偏大等问题。     

客家传统聚落景观基因识别及其地学视角的解析

根据景观基因理念,借助聚落形态学的方法,遵循地学中的内在唯一性、外在唯一性、局部唯一性和总体优势性等原则,可以从民居特征、布局形态、主体性公共建筑、参照性环境因子、客家装饰、建筑脸面、建筑色彩、墙头造型等方面识别出客家传统聚落的景观基因特征,这与客家传统聚落的自然环境、客家精神、传统观念、历史文化交融、社会氛围等地学因子密切相关。     

淮海经济区城市空间影响范围与城市经济区划分

运用因子分析法求取淮海经济区20个地级市的综合实力指数及等级划分。根据城市综合实力指数和等级划分,选取4个一级城市作为中心城市,然后运用断裂点公式计算中心城市与邻近城市的空间影响距离。再根据空间影响距离划分各中心城市经济影响区范围。最后以城市经济影响区为基础,综合考虑各城市的区域特征、发展潜力、现有经济规划、历史习惯和人文特征,确定城市经济区界限。研究淮海经济区城市经济区形成和划分的目的是指明各城市在整个区域内劳动地域分工中的地位,了解城市经济发展现状和主要特点。