Structural Identification of a Masonry Tower Based on Operational Modal Analysis

A wide program of structural assessment has been carried out by Politecnico di Milano on the historic bell tower of the church Chiesa Collegiata in Arcisate (Varese, northern Italy). Within this context, the first part of the article summarizes the results obtained from the application of the stochastic subspace identification method to ambient response data collected in two dynamic tests, carried out in June 2007 and June 2008. Next presented is the vibration-based methodology developed for the calibration of a three-dimensional finite element model of the tower, consisting in the successive application of systematic manual tuning, sensitivity analysis, and simple system identification algorithm.     

From institutions to events – structural change in Norwegian local cultural policy

In this paper we discuss the ongoing restructuring of local cultural policy in Norway. Since the 1990s, we argue, the local cultural sector has been undergoing a structural change, in the form of a movement from institutions to events. As public resources granted to traditional local cultural institutions such as libraries and culture schools decrease, there is a rise in resources granted to new arenas of local cultural life, such as cultural festivals and culture houses. We explain this shift of balance from institutions to events in local cultural policy with reference to three types of mechanism. First, we point to the ‘flexibilisation’ of the cultural sector, which ensues from its sensitivity to changes in the funding of the local governments. Second, new forms of earmarked state funding schemes pull local resources in the direction of cultural festivals and cultural events. A third mechanism that explains the shift from institutions to events is local policymakers’ adoption of theories of culture as a source of urban and regional regeneration.     

Models of war 1770–1830: the birth of wargames and the trade-off between realism and simplicity

The first sophisticated wargames (military board games) were developed between 1770 and 1830 and are models of military conflict. Designers of these early games experimented fruitfully with different concepts that were formulated in interaction with the external dynamics of the military systems that they tried to represent and the internal dynamics of the design process itself. The designers of early wargames were confronted with a problem that affects all models: the trade-off between realism and simplicity, which in the case of wargames amounts to the trade-off between realism and playability. I try to show how different game concepts were developed as an answer to this problem, and how these seemingly arcane concepts form a relevant topic of investigation in the history of ideas. Moreover, a direct offshoot of this conceptual experimentation between 1770 and 1830 was the ‘free’ German wargame (Kriegsspiel), which became an integral part of German operational planning in the nineteenth and twentieth centuries, thus adding another chapter to the story of the influence of ideas on human history.     

城市产业结构升级与空间结构形态演变研究——以长春市为例

产业结构演变与城市空间拓展的互动是城市实现可持续发展的重要路径。本文从产业结构演进与城市用地结构变化、产业结构更新与城市功能地域调整、产业结构调整与城市空间形态优化等方面分析了城市产业结构升级与城市空间形态演变的互动机制,并以长春市为例,研究了长春市产业结构演变与城市空间形态演变的互动变化过程,提出了二者未来互动变化的趋势。     

基于点云数据的秦始皇兵俑头面部特征提取与统计分析研究

考古出土的秦始皇兵俑是秦朝十分珍贵的实物资料,具有重大的历史、科学和艺术研究价值,其“千人千面”的特点更是备受关注,被认为是秦人的真实写照。现代人体测量中,头面部特征因其多受遗传因素作用,少受环境因素影响,被广泛应用于分析各民族之间的亲缘关系。通过采集50个样本的兵俑头部高精度三维点云数据并提取了头面部特征,运用样本相关性分析和数据大小排序的统计分析方法,与现代29个群体或地区头面部特征进行了对比研究。结果显示秦始皇兵俑样本的头面部特征完全各异且高度相关,同时与现代群体或地区的头面部特征差异性较小,定量化地明确了秦始皇兵俑的相关特点。     

执政党的组织形象及其结构体系

执政党组织形象的理论研究是党的建设研究领域中的一个崭新课题。执政党的组织形象是执政党的客观实在与公众主观认知、评价的混合物,具有系统性、形象性、阶级性和动态性等特征。从不同角度、不同层面分析,可以对执政党组织形象的结构体系有更深刻的认识。     

我国出境游客旅行前的信息搜索行为意向研究：基于TAM、TPB与DTPB模型

本文使用TAM、TPB与DTPB模型对我国出境游客旅行前的信息搜索行为意向进行分析发现,态度是影响我国出境游客旅行前信息搜索行为意向的首要因素,其次则是知觉有用性、感知行为控制和主观规范。同时,研究也发现,虽然上述3个模型对行为意向均具有较强的解释力,但从模型解释的变异量、拟合度及简约性来看,TPB模型最为恰适,且修正后的TPB模型解释了行为意向75％的变异。     

人口数据格网化模型研究进展综述

人口数据格网化是目前人口空间分布研究的热点。本文对国内外人口数据格网化模型研究进行总结,重点剖析几种主要的人口数据格网化模型。研究表明:人口数据格网化模型从单纯的、静态的格网化方法,逐步向自然、经济社会因素综合影响下的空间模型过渡,朝着动态模型方向发展;随着格网化数据应用领域的不断拓展,以不同级别格网为基本统计单元的人口数据生产将是人口数据获取的一个重要发展趋势。     

Boerhaave's Furnace. Exploring Early Modern Chemistry through Working Models

This article discusses the (re)construction and use of an Early modern instrument, better known as Herman Boerhaave's (1668–1738) little furnace. We investigate the origins, history and materiality of this furnace, and examine the dynamic relationship between historical study and reconstructing and handling an object. We argue that combining textual analysis with performative methods allows us to gain a better understanding of both the role of lost material culture in historical chemical practice, pedagogy, and knowledge production, and provide a deeper understanding of the embodied experiences and knowledge of historical actors. Having made and used two versions of Boerhaave's furnace, we provide insight in what present-day working models can tell us about historical materials and practices approximately three centuries ago.     

公共危机治理主体的多元化及结构分析

政府失败理论、治理理论、利益相关者理论和协同理论为公共危机治理主体多元化提供了强有力的理论支撑。在多元主体结构中,政府是公共危机治理的主导力量,也是核心主体;民间组织是公共危机治理的重要力量,也是联系政府与公民的纽带;企业和公民是公共危机治理的基础;媒体是公共危机治理的重要媒介,也是政府与其他主体合作互助信息平台的主要搭建者。